JP4325345B2 - Exhaust gas treatment equipment - Google Patents

Description

The present invention is, for example, relates to exhaust gas treatment apparatus that turn into cleaning harmful components in the exhaust gas exhausted from an internal combustion engine or the like.

The exhaust gas discharged from the automobile engine contains nitrogen oxides (NO _x ), carbon monoxide (CO), and hydrocarbons (HC) as harmful components. There are the following three conventional devices for purifying these harmful gases.
1. An example of a purification device currently in practical use is a three-way catalyst. By passing exhaust gas from the engine through this catalyst, harmful gas components are converted into clean gases of H ₂ O, CO ₂ and N ₂ .
2. In a lean burn engine or diesel engine purification system using gasoline, where it is difficult to use a three-way catalyst, a plasma processing device is inserted into the exhaust line of the engine, and a catalytic purification device is connected downstream of the plasma processing device. An exhaust gas treatment apparatus for automobiles has been proposed (see, for example, Patent Document 1).
3. A three-way catalyst or a ZSM-5 catalyst is filled between the discharge electrodes of the discharge treatment apparatus, and the discharge treatment and the catalyst treatment are used in combination (for example, see Non-Patent Document 1). Furthermore, exhaust gas purification of diesel engines, in which hydrocarbons are injected into exhaust gas from tanks such as light oil and gasoline before discharge treatment and catalyst treatment, and mixed gas of hydrocarbon and exhaust gas is subjected to discharge treatment and catalyst treatment An apparatus has been proposed (see, for example, Patent Document 2).

  Currently, there is a demand for a purification device that reduces harmful gases emitted from gasoline-based lean burn engines and diesel engines, which are difficult to use three-way catalysts. As an example of the purification device, as described above, a conventional catalytic purification device with a plasma processing device added thereto is known.

Next, the cleaning mechanism by the plasma processing apparatus and the catalytic purification apparatus will be described (for example, see Non-Patent Documents 2 and 3).
The plasma processing apparatus includes a discharge electrode, and exhaust gas passes between the discharge electrodes. By performing discharge plasma treatment on the exhaust gas, the exhaust gas is subjected to the following discharge chemical reaction.
First, when oxygen molecules or water molecules in the exhaust gas are discharged, the following dissociation occurs.
O ₂ → 2O ^*
H ₂ O → H ^* + OH ^*
O ^* and OH ^* react with hydrocarbons (HC) and nitrogen monoxide (NO), which are harmful gases, to formaldehyde, acetaldehyde, nitrogen dioxide (NO ₂ ), carbon monoxide (CO), and carbon dioxide. Carbon (CO ₂ ) and water (H ₂ O) are generated.
HC + O ^* (or OH ^* ) → formaldehyde, acetaldehyde, CO, CO ₂ , H ₂ O
NO + O ^* → NO ₂

Aldehydes and CO generated by this discharge chemical reaction are reducing gases, and NO ₂ is an oxidizing gas. When this reducing gas and oxidizing gas are passed through the catalytic purification device in the next stage, the reducing gas and the oxidizing gas react on the catalyst surface, so that nitrogen (N ₂ ), carbon dioxide (CO ₂ ), water Generate (H ₂ O) and clean.
Aldehydes (or CO) + NO ₂ → N ₂ , CO 2, H ₂ O (catalyst surface)

  In this way, exhaust gas containing oxygen is subjected to discharge plasma treatment, and harmful gases in the exhaust gas are converted into highly reactive reducing gas and oxidizing gas, and the exhaust gas is purified by using a catalyst. Can be

JP-A-6-335621 (second page, FIG. 1) Japanese Patent Laid-Open No. 6-10651 (page 3, FIGS. 1 and 2) Kazuo Shimizu, Tetsuji Oda: “Fundamental research on catalytic action in exhaust gas treatment with non-thermal equilibrium plasma”, Proceedings of National Congress of the Electrostatic Society '97 (JP), 1997, p. 239-242 Steven J. Schmieg, Byong K. Cho and Se H. Oh: “Hydrocarbon Reactivity in a Plasma-Catalyst System: Thermal Versus Plasma-Assisted Lean NOx Reduction”, SAE Technical Paper Series (EN), 2001, 2001-01-3565 EA Filimonova, Ytong ho Kim, Sang Hee Hong and Young-Hoon Song: "Multiparametric investigation on NOx removal from simulated diesel exhaust with hydrocarbons by pulsed corona discharge", Journal of Physics D: Applied Physics (EN), 2002, vol.35 p.2795-2807

A technical problem of the exhaust gas processing apparatus using the plasma processing apparatus and the catalytic purification apparatus as described above will be described. When the present inventors demonstrated the effect of the discharge plasma treatment, the following two things were found.
First, using simulating gas, the conversion effect of HC and NO _x by the discharge plasma treatment was compared for the case where HC was unsaturated hydrocarbon propylene and the case where HC was saturated hydrocarbon. However, it has been found that propylene can be efficiently converted to a highly reactive gas with less discharge energy than propane.
Secondly, when exhaust gas components in various operation modes were actually measured using a gasoline automobile engine, unsaturated hydrocarbons such as propylene were found to be extremely low in concentration and saturated hydrocarbons were HCs. It turns out that there is a driving mode that occupies the majority. Further, when such an exhaust gas component is used, the efficiency of the discharge plasma treatment is lowered, and it becomes necessary to input excessive discharge energy.

  Based on these facts, the present inventors may significantly reduce the amount of unsaturated hydrocarbons in the exhaust gas due to the operation mode of the engine and significantly reduce the efficiency of the discharge plasma treatment. Found that there is a problem to consume. Therefore, it is a technical problem to solve this problem and efficiently clean the exhaust gas.

  In each of the conventional devices described above, in any case in which the unsaturated hydrocarbon is used, it can be efficiently converted to a highly reactive gas with less discharge energy than in the case where the saturated hydrocarbon is used. No mention is made of the action of unsaturated hydrocarbons, and no measures are taken when the amount of unsaturated hydrocarbons contained in the exhaust gas is extremely small. At that time, excessive discharge energy is required, The efficiency of the discharge plasma treatment remains low. For this reason, exhaust gas could not be cleaned efficiently.

  In addition, before performing the conventional discharge plasma treatment and catalyst treatment, hydrocarbons are injected into exhaust gas from a tank such as light oil or gasoline, and a mixed gas of hydrocarbon and exhaust gas is subjected to discharge plasma treatment and catalyst treatment. Light oil or gasoline is added to the exhaust gas as it is, and there are many products with very little unsaturated hydrocarbons in light oil and gasoline. In that case, excessive discharge energy is required, and discharge plasma treatment is required. There was a problem that the efficiency of was still low.

  The present invention has been made to solve the above-described problems of the conventional ones, and can efficiently purify the exhaust gas even when the amount of unsaturated hydrocarbons contained in the exhaust gas is extremely small. It is an object of the present invention to provide an exhaust gas treatment method and an exhaust gas treatment device that can be used.

  An exhaust gas treatment apparatus according to the present invention includes a discharge plasma treatment apparatus that reforms at least a part of saturated hydrocarbons in exhaust gas into unsaturated hydrocarbons, and at least a part of harmful components in exhaust gas is reactive. An exhaust gas activation device that converts to a high gas and a catalytic purification device that cleans harmful components converted to a highly reactive gas with a catalyst are sequentially provided in the exhaust gas exhaust path.

  The exhaust gas treatment apparatus according to the present invention includes an exhaust gas activation device that converts at least a part of harmful components in the exhaust gas into a highly reactive gas, and a harmful component converted into a highly reactive gas. A discharge-type plasma processing apparatus for sequentially providing in the exhaust path, and reforming at least a part of saturated hydrocarbons in blow-by gas into unsaturated hydrocarbons; And means for adding blow-by gas, in which at least part of the saturated hydrocarbon is reformed by the apparatus, to the exhaust gas.

  Further, the exhaust gas treatment device according to the present invention includes an exhaust gas activation device that converts at least a part of harmful components in the exhaust gas into a highly reactive gas, and a harmful component converted into a highly reactive gas. A discharge-type plasma processing apparatus for sequentially providing in the exhaust path, and reforming at least a part of saturated hydrocarbons in the fuel evaporative gas into unsaturated hydrocarbons; And means for adding a fuel evaporative gas in which at least a part of the saturated hydrocarbon is reformed by the processing apparatus to the exhaust gas.

The exhaust gas treatment apparatus according to the present invention includes a discharge plasma treatment apparatus that reforms at least a part of saturated hydrocarbons in the exhaust gas into unsaturated hydrocarbons, and therefore, the unsaturated carbonization contained in the exhaust gas. hydrogen even when extremely small, Ru can be efficiently clean the exhaust gas.

Embodiment 1 FIG.
Figure 1 is a diagram for explaining the exhaust gas treatment equipment according to the first embodiment of the present invention, more specifically, it is a block diagram showing a basic configuration of an exhaust gas treatment device.
In FIG. 1, an exhaust manifold 2, an exhaust gas reformer (hydrocarbon reformer) 3, an exhaust gas activation device 4, and a catalytic purification device 5 are disposed in an exhaust gas exhaust path from the engine 1 to the exhaust gas outlet 7. The silencers 6 are arranged in this order. An exhaust pipe 8 connects the exhaust manifold 2 to the exhaust gas outlet 7.

Several cylinders (not shown) are provided inside the engine 1, and exhaust gas combusted inside the cylinder is released to the outside of the engine 1. The exhaust manifold 2 is an exhaust gas pipe that collects exhaust gases exhausted from the plurality of cylinders into one.
The combined exhaust gas is introduced into the exhaust gas reformer 3 and undergoes reforming treatment. The reforming treatment referred to here is to convert (reform) at least a part of saturated hydrocarbons contained in the exhaust gas into unsaturated hydrocarbons.
Thereafter, the exhaust gas containing the reformed unsaturated hydrocarbon passes through the exhaust pipe 8 and is introduced into the exhaust gas activation device 4. At this time, since the heat of the exhaust gas is radiated through the exhaust pipe 8, the exhaust gas is cooled. Accordingly, the exhaust gas treatment temperature differs between the exhaust gas reforming device 3 and the exhaust gas activation device 4.

The exhaust gas is subjected to an activation process by the exhaust gas activation device 4. The activation treatment referred to here is, for example, generating radicals in the exhaust gas activation device 4 and reacting harmful components in the exhaust gas with the radicals. In the course of this radical reaction, some exhaust gas components are converted into oxidizing gas or reducing gas. Another part of the exhaust gas may be converted into a clean gas component.
The exhaust gas that has reacted with the radicals is purified by the following catalytic purification device 5. The purification treatment referred to here means that harmful gas components contained in exhaust gas are converted into clean components such as nitrogen (N ₂ ), oxygen (O ₂ ), water (H ₂ O), and carbon dioxide CO ₂ . That is. An example of the catalytic purification device 5 is one in which an exhaust pipe filled with a honeycomb-shaped ceramic base material that has been used in the past and carrying a noble metal catalyst such as platinum is used.
The exhaust gas purified by the catalytic purification device 5 then passes through the silencer 6 and is exhausted to the outside through the exhaust gas outlet 7. The silencer 6 is a device that reduces noise caused by exhaust, and a conventionally used device can be used.

  FIG. 2 shows an example when FIG. 1 has a specific configuration. In the present embodiment, the exhaust gas reforming apparatus 3 of FIG. 1 is a discharge plasma reforming apparatus (first discharge plasma processing apparatus) 31, and the exhaust gas activating apparatus 4 is a discharge plasma activating apparatus (second discharge). Plasma processing apparatus) 41. A high voltage power source (not shown) is connected to the discharge plasma reforming device 31 and the discharge plasma activation device 32 via plasma generation control devices 32 and 42, respectively. The plasma control devices 32 and 42 monitor the generation of the discharge plasma or control the high voltage power source based on information such as the engine speed and the exhaust gas temperature to control the discharge plasma reforming device 31 and the discharge plasma. The activation device 32 is started and stopped and the plasma generation amount is controlled.

FIG. 3 is a partially broken perspective view showing the discharge plasma reforming apparatus (first discharge plasma processing apparatus) 31 and the discharge plasma activation apparatus (second discharge plasma processing apparatus) 41 more specifically. A discharge plasma processing apparatus having the same structure was used for both the discharge plasma reforming apparatus 31 and the discharge plasma activation apparatus 41. However, since the operating temperatures are different as described above, different effects can be obtained with these apparatuses.
Exhaust gas passes through the inside of the exhaust pipe 21. For example, exhaust gas can be passed from left to right in the figure. Both ends of the exhaust pipe 21 have a flange structure so that the exhaust manifold 2 and the exhaust pipe 8 can be connected. The material of the exhaust pipe 22 may be an insulating material and is not limited to one. For example, ceramic such as aluminum oxide can be used.

Inside the exhaust pipe 21, a high voltage electrode 22 fixed by a mesh 23 is installed so as to be coaxial with the exhaust pipe 21. In order to supply a voltage to the high voltage electrode 22, the high voltage electrode terminal 22 a and the power supply terminal 22 b are connected by a high voltage cable 26. This power supply terminal 22b can be connected to the plasma generation control device by a cable (not shown).
A ground electrode 24 is attached around the exhaust pipe 21 (outer peripheral surface). The ground electrode 24 can be fastened with a fixing screw 27 and simultaneously connected to the plasma generation control device with a cable (not shown).
In addition, the material of the mesh 23 should just be an insulator, and although it is not limited to one, For example, ceramics, such as aluminum oxide, can be used.
The material of the high voltage electrode 22 and the ground electrode 24 may be metal as long as it is not limited to one, but for example, stainless steel can be used.

  In the discharge plasma processing apparatus configured as described above, a space between the high voltage electrode 22 and the ceramic exhaust pipe 21 is applied by applying an alternating high voltage or a pulsed high voltage between the high voltage electrode 22 and the ground electrode 24. Silent discharge can be generated. The length of the space where silent discharge occurs in the gas flow direction is the same as the length of the ground electrode 24 in the gas flow direction. That is, silent discharge occurs in the space surrounded by the ground electrode 24. The exhaust gas introduced into the discharge plasma processing apparatus passes through the mesh 23 and passes through the silent discharge space. During this passage, the exhaust gas undergoes a chemical reaction by the discharge plasma.

Next, the experimental results of reforming the exhaust gas using the above-described discharge plasma reforming apparatus 31 shown in FIG. 3 will be described.
The exhaust gas from a lean burn engine using gasoline was simulated as follows.
Propane concentration: 501 ppm,
O ₂ concentration: 10%
Moisture concentration: 20,000 ppm
When the temperature of the simulated gas was changed from 45 ° C. to 650 ° C. and passed through the discharge plasma reformer 31, the result of reforming of propane varied depending on the temperature.
In this experiment, when the power consumed by the discharge is W [J / s] and the processing flow rate of the simulated gas is Q [L / s], the discharge power consumed for the processing per 1 L of the exhaust gas. Evaluation was made with a value of W / Q.

When the experiment was conducted while changing the exhaust gas temperature and W / Q, the results shown in FIG. 4 were obtained. FIG. 4 shows the result of analyzing the exhaust gas before and after the discharge plasma reforming treatment with an infrared absorptiometer. In FIG. 4, the horizontal axis represents the wave number [cm ⁻¹ ] of infrared rays, and the vertical axis represents the absorbance, and the absorption spectra obtained under the respective experimental conditions are shown superimposed. Appeared the absorption peak near 914 cm ^-1 when propylene is present in the exhaust gas, in the case of ethylene, the absorption peak appears in the vicinity of 948cm ^-1. The higher the absorption peak height, the higher the gas concentration.
From FIG. 4, when no discharge plasma reforming treatment was performed, that is, when W / Q was 0, it was not possible to recognize the formation of ethylene or propylene at both exhaust gas temperatures of 45 ° C. and 600 ° C. Next, discharge was performed at an exhaust gas temperature of 45 ° C., and even when W / Q was 226 J / L, generation of ethylene and propylene could not be recognized. Subsequently, when the exhaust gas temperature was set to 600 ° C. and discharging was performed, and W / Q was 58.5 J / L and 117 J / L, the production of propylene and ethylene could be confirmed.

Next, the amount of ethylene and propylene produced at each temperature (50 ° C, 100 ° C, 200 ° C, 300 ° C, 400 ° C, 500 ° C, 600 ° C, 650 ° C) when W / Q is 120 J / L is measured. The amount of propane converted to ethylene and propylene was examined. The result is shown in FIG. In FIG. 5, the horizontal axis indicates the temperature T [° C.], and the vertical axis indicates the conversion rate [%], which is the ratio of propane converted to ethylene and propylene.
From FIG. 5, it was found that the conversion rate to ethylene and propylene was rapidly accelerated from above 500 ° C., and the conversion rate was highest around 600 ° C. For this reason, in order to convert propane, which is a saturated hydrocarbon, into ethylene or propylene, which is an unsaturated hydrocarbon, by subjecting the exhaust gas to discharge plasma treatment, the effect is effective if the exhaust gas temperature is in the range of greater than 400 ° C and less than 650 ° C. Yes, preferably in the range of 500 ° C. to 650 ° C., more preferably around 600 ° C. Exhaust gas of up to about 1000 ° C from the actual gasoline engine and about 700 ° C from the diesel engine may be discharged. Maintain the exhaust gas temperature in the range of 500 ° C to 650 ° C so as not to cool this hot gas as much as possible. Good.

The process of converting propane to ethylene or propylene includes the following reaction process.
First, when exhaust gas is discharged, O ^* and OH ^* are generated from oxygen molecules and water molecules by discharge. This O ^* and OH ^* react with a part of propane to produce CH ₃ —CH ₂ —CH ₂ ^* (hereinafter referred to as n—C ₃ H ₇ ) as a reaction intermediate product.
C ₃ H ₈ + O ^* → n-C ₃ H ₇ + OH ^*
C ₃ H ₈ + OH ^* → n-C ₃ H ₇ + H ₂ O

Next, n-C ₃ H ₇ reacts again to produce ethylene (CH ₂ ═CH ₂ ) and propylene (CH ₃ CH═CH ₂ ).
nC ₃ H ₇ → CH ₃ CH═CH ₂ + H
_{n-C 3 H 7 → CH} 2 = CH 2 + CH 3
_{n-C 3 H 7 + O} 2 → CH 3 CH = CH 2 + OH *
_{n-C 3 H 7 + OH} * → CH 3 CH = CH 2 + H 2 O
Thus, it can be seen that propylene and ethylene are generated by generating O ^* and OH ^* by discharge and acting on propane.

Next, reforming of butane and pentane contained in the exhaust gas will be described. Similar to propane, these saturated hydrocarbons tend to be converted to unsaturated hydrocarbons as the exhaust gas temperature during plasma treatment increases.
When butane or pentane is present in the discharge plasma, high-energy electrons (e ⁻ ) excited by a high electric field formed by applying a high voltage directly collide with butane or pentane, and this collisional dissociation causes n-C ₃ H _7. May be generated. The production of n-C ₃ H ₇ causes conversion to propylene and ethylene as described above. As a result, butane and pentane can also be converted to unsaturated hydrocarbons.

Next, the temperature dependence of the NO ₂ generation reaction in the discharge plasma reformer 31 will be described. As a feature of NO _2, the exhaust gas temperature is found to be significant autolysis of NO ₂ at 550 ° C. or higher. In high-temperature exhaust gas, in addition to self-decomposition by heat, it decomposes remarkably by catalytic reaction with stainless steel and other metals. Stainless steel serves as a catalyst for decomposing NO ₂ into NO from 550 ° C., for example, molybdenum serves as a similar catalyst from 350 ° C. In the high-temperature exhaust gas, NO is oxidized to NO ₂ by O ^* generated by the plasma treatment, but at the same time undergoes significant decomposition by the metal member. Because of these properties, it is difficult to oxidize NO to NO ₂ inside the high-temperature discharge plasma reformer 31. Therefore, in order to efficiently generate NO ₂ , plasma processing is preferably performed when the exhaust gas temperature is lowered.

Thus, in order to obtain unsaturated hydrocarbons from the exhaust gas, there is an effect if the exhaust gas temperature in the discharge plasma reforming apparatus 31 is in the range of more than 400 ° C. and 650 ° C. or less, preferably 500 ° C. to 650 ° C. The range of ° C is good, more preferably around 600 ° C.
In order to promote the production of NO ₂ , it is desirable that the exhaust gas temperature in the discharge plasma activation device 41 be 400 ° C. or lower, which is lower than the exhaust gas temperature in the discharge plasma reforming device 31. Note that the lower limit of the exhaust gas temperature in the discharge plasma activation device 41 depends on the temperature at which the catalyst of the subsequent catalytic purification device 5 is activated. That is, it is desirable that the exhaust gas that has passed through the discharge plasma activation device 41 has a temperature that sufficiently heats the catalyst of the catalytic purification device 5. Although this catalyst is not limited to one as follows, for example, when the catalyst is platinum supported on alumina oxide, it is desirable that the temperature is in the range of 100 ° C. or more and 400 ° C. or less where water evaporates.
In the present embodiment, the exhaust pipe 8 between the discharge plasma reforming device 31 and the discharge plasma activation device 41 so that the exhaust gas temperature in the discharge plasma activation device 41 is in the range of 100 ° C. to 400 ° C. Determine the length.

Next, an operation of the exhaust gas processing apparatus according to the present embodiment shown in FIG. 2, that is, an exhaust gas processing method when performing a two-stage discharge plasma processing will be described.
The main exhaust gas components exhausted from the engine 1 are
CO ₂ , CO, H ₂ O,
NO, NO ₂ ,
Saturated hydrocarbons, unsaturated hydrocarbons, unburned fuel components,
N ₂
It is.
The type of engine is not limited to one, and in addition to a conventional gasoline engine, a diesel engine or a lean burn engine for gasoline can also be targeted. In the case of a diesel engine or a gasoline lean burn engine, in addition to the above components, about several to 10% of oxygen is contained in the exhaust gas. In the case of a conventional gasoline engine, the concentration of oxygen contained in the exhaust gas is extremely low.
As described above in the present embodiment, when oxygen is contained in the exhaust gas, the reforming may be promoted by the discharge plasma reforming device 31. Therefore, when exhaust gas from a conventional engine is used as a processing target The air may be mixed on the upstream side (previous stage) of the discharge plasma reforming device 31 (exhaust gas reforming device 3).

When the exhaust gas from the engine passes through the exhaust manifold 2 and passes through the discharge plasma reforming device 31, the temperature of the exhaust gas is low at the start, but becomes higher as the vehicle runs at a higher speed, and substantially the outside air temperature. To 900 ° C.
As described above, it is desirable that the processing temperature of the discharge plasma reforming apparatus 31, that is, the temperature of the exhaust gas in the discharge plasma reforming apparatus 31 is substantially larger than 400 ° C. and not more than 650 ° C. Here, the case where the exhaust gas temperature is in the range of more than 400 ° C. and less than or equal to 650 ° C. will be described. However, the case where the temperature of the exhaust gas is 400 ° C. or less will be described in detail in an embodiment described later.
When the exhaust gas is plasma-treated by the discharge plasma reforming device 31, at least a part of the saturated hydrocarbon is reformed to an unsaturated hydrocarbon such as propylene or ethylene. Although NO is also partially converted to NO _2, the majority remains NO.

Next, the exhaust gas that has passed through the discharge plasma reforming device 31 is cooled in the process of passing through the exhaust pipe 8 and enters the discharge plasma activation device 41 at a lower temperature than in the discharge plasma reforming device 31. When the exhaust gas is subjected to plasma treatment by the discharge plasma activation device 41, O ^* and ozone are generated from oxygen molecules by discharge, and oxidation of NO is promoted. In addition, when propylene or ethylene is plasma-treated, NO is oxidized to NO ₂ during the decomposition reaction thereof, and at the same time, propylene and ethylene are changed to reducing gases such as formaldehyde, acetaldehyde, and CO. Further, unsaturated hydrocarbons and part of other hydrocarbons are converted to CO ₂ or H ₂ O, that is, cleaned.

Such oxidizing NO ₂ , reducing formaldehyde, acetaldehyde, and CO are rich in reactivity on the catalyst surface, and undergo oxidation-reduction reaction in the subsequent catalytic purification device 5 to produce CO ₂ , H _2. Purified to O, N ₂ .

  Subsequently, the exhaust gas purified by passing through the catalytic purification device 5 passes through the silencer 6 and is discharged outside through the exhaust gas outlet 7.

As described above, the exhaust gas exhausted from the engine is processed with a temperature difference between the two discharge plasma processing apparatuses, so that the exhaust gas can be efficiently cleaned. Further, even when the amount of unsaturated hydrocarbons contained in the exhaust gas is extremely small depending on the operation mode of the engine, since the unsaturated hydrocarbons are generated from the saturated hydrocarbons, the exhaust gas can be purified with high efficiency.
Further, the discharge plasma treatment method by silent discharge is a method for easily generating radicals at a high concentration. Therefore, the hydrocarbon reforming device (exhaust gas reforming device 3) and the exhaust gas activating device 4 are used as discharge plasma processing devices, and the exhaust gas is subjected to discharge plasma processing, so that radicals (O ^* and OH ^* ) are contained in the exhaust gas. Can be produced easily and at a high concentration.

Embodiment 2. FIG.
Figure 6 is a diagram for explaining the exhaust gas treatment equipment according to a second embodiment of the present invention, more specifically, it is a cross-sectional view schematically showing a cylinder portion of the inner engine.
In the first embodiment, the discharge plasma reformer 31 is connected to the downstream (rear stage) side of the exhaust manifold 2, but in the present embodiment, it is connected to the upstream (front stage) side of the exhaust manifold 2, that is, directly below the engine. ing. Since other configurations are the same as those of the first embodiment, differences from the first embodiment will be mainly described below.

In FIG. 6, 130 is a piston, 131 is an intake valve, 132 is an exhaust valve, 133 is an intake pipe, and 134 is an exhaust pipe.
Here, although explanation of the operation of the engine is omitted, the arrangement relationship between the exhaust gas exhaust path (exhaust gas flow path) and the discharge plasma reformer 31 will be described. As the engine operates, the hot exhaust gas is exhausted to the outside of the engine through the exhaust pipe 134. A discharge plasma reformer 31 is connected to the engine outlet, and an exhaust manifold 200 is connected to the subsequent stage. Although not all of the exhaust manifold 200 is illustrated, the exhaust manifold 200 is configured to exhaust one exhaust gas from a plurality of exhaust gas reformers 31 provided so as to correspond to a plurality of cylinders, respectively. It is configured to be put together in a tube. The rear stage of the exhaust manifold 200 is connected to the exhaust pipe 8, and the downstream side of the exhaust pipe 8 has the same configuration as that shown in FIG. Although not shown, the discharge plasma reforming device 31 is connected to the plasma generation control device 32.

  Next, the operation will be described. The exhaust gas that has passed through the exhaust pipe 134 in the engine is introduced into the discharge plasma reformer 31. At this time, since the exhaust gas in a high temperature state just exhausted from the engine is introduced into the discharge plasma reforming device 31, the discharge plasma treatment can be performed in a high temperature state. By this reforming treatment, at least a part of the saturated hydrocarbons in the exhaust gas is reformed into unsaturated hydrocarbons. The reformed exhaust gas is combined into one exhaust pipe 8 by the exhaust manifold 200 and introduced into the exhaust gas activation device 4.

  When the engine 1 is started or when the automobile travels at a low speed, the combustion temperature inside the engine 1 may decrease. In such a case, by providing the exhaust gas reforming device 31 between the engine 1 and the exhaust manifold 200, the exhaust gas exhausted from the engine 1 can be used before being cooled outside the engine 1. This makes it possible to use high-temperature exhaust gas in the discharge plasma reforming apparatus 31, and the effect of promoting reforming is obtained.

Reference Example 1
FIG. 7 is a diagram for explaining an exhaust gas treatment device and an exhaust gas treatment method according to Reference Example 1 , and more specifically, a configuration diagram showing a configuration of the exhaust gas treatment device.
In the first embodiment, the step of reforming at least a part of the saturated hydrocarbon in the exhaust gas into the unsaturated hydrocarbon, and the step of converting at least a part of the harmful components in the exhaust gas into a highly reactive gas. And the step of cleaning with a catalyst the harmful components converted at least partially into a highly reactive gas. In this reference example , instead of the saturated hydrocarbons in the exhaust gas, At least a part of the saturated hydrocarbon is reformed into an unsaturated hydrocarbon and added to the exhaust gas. Hereinafter, differences from the first embodiment will be mainly described.

In FIG. 7, the exhaust manifold 2, the discharge plasma activation device 41, the catalytic purification device 5, and the silencer 6 are arranged in this order on the exhaust gas exhaust path from the engine 1 to the exhaust gas outlet 7. An exhaust pipe 8 connects the exhaust manifold 2 to the exhaust gas outlet 7. Exhaust gases exhausted from the engine 1 are combined into one by the exhaust manifold 2. The combined exhaust gas passes through the exhaust pipe 8 and is introduced into the discharge plasma activation device 41.
At this time, since the heat of the exhaust gas is radiated through the exhaust pipe 8, the exhaust gas is cooled. As described in the first embodiment, when the exhaust gas temperature in the discharge plasma activation device 41 is 400 ° C. or lower, NO ₂ is efficiently generated, so the exhaust pipe 8 cools the exhaust gas to 400 ° C. or lower. The length of the exhaust pipe 8 should be determined so that

On the other hand, the blow-by gas supply device 50 is connected to the inside (not shown) of the crankcase below the engine, and supplies the blow-by gas inside the crankcase to the discharge plasma reformer (hydrocarbon reformer) 31. The blow-by gas supply device 50 is composed of, for example, an air pump.
The discharge plasma reforming apparatus 31 is heated by a heater 51 as a heating means so as to be in a range of more than 400 ° C. and 650 ° C. or less, and at least a part of the saturated hydrocarbons in the blow-by gas is changed to unsaturated hydrocarbons. Quality. The blow-by gas that has been subjected to the discharge plasma treatment by the discharge plasma reforming device 31, that is, at least a part of the saturated hydrocarbon is reformed, is injected into the exhaust pipe 8 by the reformed gas supply nozzle 52 and added to the exhaust gas. Mixed. The reformed gas supply nozzle 52 corresponds to means for adding blow-by gas, in which at least part of the saturated hydrocarbon is reformed by the hydrocarbon reformer, to the exhaust gas.
The discharge plasma reformer 31 is connected to the plasma generation controller 34 as in the first embodiment.
Subsequently, the exhaust gas to which the blow-by gas in which at least a part of the saturated hydrocarbon is modified is added is introduced into the discharge plasma activation device 41. The configuration downstream of the discharge plasma activation device 41 is the same as that of the first embodiment.
As the heating means (heater 100), a known electric heater or the like can be used.

During the operation of the engine 1, exhaust gas leaks from the cylinder into the crankcase, and the exhaust gas stays in the exhaust gas. This gas is called blow-by gas. This blow-by gas is conveyed to the discharge plasma reformer 31 by the blow-by gas supply device 50. In the discharge plasma reformer 31, this blow-by gas is plasma-treated to reform at least a part of the saturated hydrocarbons contained in the blow-by gas components into unsaturated hydrocarbons.
The reformed gas is mixed with the exhaust gas from the engine 1 inside the exhaust pipe 8 by the reformed gas supply nozzle 52.
As a result, the amount of unsaturated hydrocarbons in the exhaust gas increases, so that the exhaust gas cleaning efficiency is improved by performing the same operation as in the first embodiment downstream from the discharge plasma activation device 41. .

The component of the blow-by gas contains hydrocarbons as in the exhaust gas, and when this is subjected to discharge plasma treatment, the saturated hydrocarbons can be reformed into unsaturated hydrocarbons.
In addition, since blow-by gas contains hydrocarbons which are harmful components, it is said that blow-by gas itself will cause air pollution if it is released into the environment from an automobile, and countermeasures are required.
According to the present reference example , the exhaust gas from the engine can be efficiently cleaned at the same time as the blow-by gas that becomes the air pollution gas is cleaned.

Reference Example 2
FIG. 8 is a diagram for explaining an exhaust gas treatment device and an exhaust gas treatment method according to Reference Example 2 , and more specifically, a configuration diagram showing a configuration of the exhaust gas treatment device.
In the first embodiment, the step of reforming at least a part of the saturated hydrocarbon in the exhaust gas into the unsaturated hydrocarbon, and the step of converting at least a part of the harmful components in the exhaust gas into a highly reactive gas. And at least a part of the harmful components converted into highly reactive gas are cleaned with a catalyst in order. In this reference example , instead of saturated hydrocarbons in the exhaust gas, At least a part of the saturated hydrocarbon is reformed into an unsaturated hydrocarbon and added to the exhaust gas. Hereinafter, differences from the first embodiment will be mainly described.

  In FIG. 8, the exhaust manifold 2, the discharge plasma activation device 41, the catalytic purification device 5, and the silencer 6 are arranged in this order on the exhaust gas exhaust path from the engine 1 to the exhaust gas outlet 7. An exhaust pipe 8 connects the exhaust manifold 2 to the exhaust gas outlet 7. Exhaust gases exhausted from the engine 1 are combined into one by the exhaust manifold 2. The combined exhaust gas passes through the exhaust pipe 8 and is introduced into the discharge plasma activation device 41.

On the other hand, the fuel supply device 61 is connected to the fuel tank 60 and supplies fuel to the engine 1. The fuel supply device 61 is constituted by a liquid feed pump, for example. The fuel evaporative gas supply device 62 is connected to the upper part of the fuel tank and the discharge plasma reformer 35, and supplies the fuel evaporative gas vaporized in the fuel tank 60 to the discharge plasma reformer 35. The fuel evaporative gas supply device 62 is constituted by an air pump, for example.
The discharge plasma reforming apparatus 31 is heated by a heater 51 as a heating means so as to be in a range of more than 400 ° C. and 650 ° C. or less, and at least a part of the saturated hydrocarbons in the fuel evaporative gas is converted into unsaturated hydrocarbons. Reform. The fuel evaporative gas that has been subjected to the discharge plasma treatment by the discharge plasma reforming device 31, that is, at least a part of the saturated hydrocarbon is reformed, is injected into the exhaust pipe 8 by the reformed gas supply nozzle 64 and added to the exhaust gas. And mixed. The reformed gas supply nozzle 64 corresponds to a means for adding the fuel evaporative gas, in which at least a part of the saturated hydrocarbon is reformed by the hydrocarbon reformer, to the exhaust gas.
Subsequently, the exhaust gas to which the fuel evaporative gas in which at least a part of the saturated hydrocarbon is reformed is added is introduced into the discharge plasma activation device 41. The configuration downstream of the discharge plasma activation device 41 is the same as that of the first embodiment.

As described in the first embodiment, NO ₂ is efficiently generated when the exhaust gas temperature in the discharge plasma activation device 41 is 400 ° C. or lower. Since the high-temperature exhaust gas exhausted from the engine 1 is radiated and cooled by the exhaust pipe 8, the length of the exhaust pipe 8 may be determined so that the exhaust gas is cooled to 400 ° C. or less by the exhaust pipe 8. At this time, it is preferable to take into account the temperature of the fuel evaporative gas, which is injected into the exhaust pipe 8 by the reformed gas supply nozzle 64 and in which at least a part of the saturated hydrocarbon is reformed.

In the process of supplying fuel to the engine 1 by the fuel supply device 61, the fuel evaporates and stays inside the fuel tank 60. This fuel evaporative gas is conveyed to the discharge plasma reformer 35 using the fuel evaporative gas supply device 61. By performing discharge plasma treatment of the fuel evaporative gas in the discharge plasma reforming device 31, at least a part of the saturated hydrocarbon which is one component of the fuel evaporative gas is reformed into unsaturated hydrocarbon.
The reformed gas is mixed with the exhaust gas from the engine 1 inside the exhaust pipe 8 by the reformed gas supply nozzle 64.
As a result, the amount of unsaturated hydrocarbons in the exhaust gas increases, so that the exhaust gas cleaning efficiency is improved by performing the same operation as in the first embodiment downstream from the discharge plasma activation device 41. .

The components of the fuel evaporative gas contain hydrocarbons as well as the fuel, and the saturated hydrocarbons can be reformed into unsaturated hydrocarbons by the discharge plasma treatment.
Further, since the fuel evaporative gas contains hydrocarbons which are harmful components, it is said that if the fuel evaporative gas itself is released from the automobile into the environment, it will cause air pollution, and countermeasures are required.
According to this reference example , an effect is obtained in which the fuel evaporative gas, which becomes an air pollution gas, is cleaned, and at the same time, the exhaust gas from the engine can be efficiently cleaned.

Embodiment 3 FIG.
FIG. 9 is a diagram for explaining an exhaust gas treatment device and an exhaust gas treatment method according to Embodiment 3 of the present invention, and more specifically, a configuration diagram showing a configuration of the exhaust gas treatment device.
In the present embodiment, a packed bed type discharge plasma reforming device 37 is used as a hydrocarbon reforming device that reforms at least a part of saturated hydrocarbons in the exhaust gas into unsaturated hydrocarbons. Since other configurations are the same as those of the first embodiment, differences from the first embodiment will be mainly described below.

  The packed-bed type discharge plasma reforming device 37 is a device that generates silent discharge, and FIG. The packed bed type discharge plasma reforming apparatus 37 is configured such that the discharge space of the discharge plasma processing apparatus shown in FIG. 3 is filled with barium titanate beads 70. A barium titanate bead is a ceramic thing which spherically solidified barium titanate. The packed-bed type discharge plasma reforming apparatus 37 uses not only the form shown in FIG. 10 but also various known packed-bed type discharge plasma processing apparatuses using barium titanate. May be.

Further, a temperature sensor 71 for measuring the temperature inside the discharge space, that is, the temperature of the exhaust gas inside the packed bed type discharge plasma reforming device 37 is also provided. The temperature sensor 71 is connected to a temperature controller 72, and the temperature controller 72 is connected to the plasma generation control device 32. The temperature controller 72 increases the output voltage of a high voltage power supply (not shown) via the plasma generation control device 32 when the temperature of the exhaust gas inside the packed bed type discharge plasma reforming device 37 is lower than the set temperature. Thus, it has a function of increasing the power consumed inside the packed bed type discharge plasma reforming apparatus 37.
Further, when the temperature of the exhaust gas becomes higher than the set upper limit temperature in this heating step, the discharge power sufficient to reform the unsaturated hydrocarbon in the exhaust gas is supplied to the packed bed type discharge plasma reformer 37. Since it only has to be supplied, it also has a function of reducing the output voltage.
The voltage applied to the packed bed type discharge plasma reformer 37 may be either an alternating high voltage or a pulsed high voltage.
Subsequently, the reformed exhaust gas obtained by reforming at least a part of the saturated hydrocarbons into the unsaturated hydrocarbons in the packed bed type discharge plasma reformer 37 passes through the exhaust pipe 8 and is discharged into the discharge plasma activation device. 41. The configuration downstream of the discharge plasma activation device 41 is the same as that of the first embodiment.

Next, the temperature adjustment of the exhaust gas inside the packed bed type discharge plasma reformer 37 will be described in more detail.
When the exhaust gas temperature of the packed bed type discharge plasma reformer 37 detected by the temperature sensor 71 is 400 ° C. or less, the temperature regulator 72 is connected to a high voltage power source (not shown) via the plasma generation controller 38. Increase the output voltage.
When a high voltage is applied to the high voltage electrode 22 and the ground electrode 24 inside the packed bed type discharge plasma apparatus 37, a silent discharge occurs at a place where the barium titanate beads 70 are in contact with each other. At this time, the barium titanate bead 70 itself is a material having a large dielectric loss, and the barium titanate bead 70 itself becomes a heating element with the occurrence of discharge. The heat generated by this dielectric loss heats the exhaust gas. Therefore, by increasing the voltage applied to the packed bed type discharge plasma reforming device 37 and increasing the power consumption corresponding to the dielectric loss, the exhaust gas temperature can be heated to higher than the set temperature of 400 ° C.

  Depending on the operation of the engine 1, the temperature of the exhaust gas exhausted from the engine 1 may be low and may be immediately cooled by the exhaust manifold 2 to 400 ° C. or less. For example, the exhaust gas is immediately cooled when the engine is started or when the automobile runs at a low speed. Thus, when the temperature of the exhaust gas is low, the exhaust gas can be heated by increasing the amount of power consumed by the packed bed type discharge plasma reforming device 37, whereby the exhaust gas temperature is in the range from 400 ° C. to 650 ° C. If so, a sufficient reforming effect is obtained. Further, in this case, since only the packed bed type discharge plasma reforming device 37 can perform the discharge treatment and the heat treatment at the same time, there is an effect that a component such as an electric heater (heater) is not required and the device is simplified.

  As shown in FIG. 5, the conversion rate from saturated hydrocarbons to unsaturated hydrocarbons is highest when the exhaust gas temperature in the packed bed type discharge plasma reformer 37 is about 600 ° C. Therefore, when the exhaust gas temperature of the packed bed type discharge plasma reformer 37 detected by the temperature sensor 71 exceeds the upper limit (for example, 610 ° C.), the temperature regulator 72 is connected to the high voltage power source via the plasma generation controller 38. The output voltage (not shown) may be reduced. The upper limit temperature is not limited to one. Exhaust gas exceeding the upper limit temperature may be discharged or the exhaust gas components may vary depending on the situation of the engine 1. Accordingly, the upper limit temperature with the best reforming efficiency may be set.

  Although the temperature of the exhaust gas can be reliably adjusted by providing the temperature sensor 71 and the temperature controller 72, when a high voltage is applied to the high voltage electrode 22 and the ground electrode 24, the barium titanate beads 70 Since the silent discharge is generated at the place where they are in contact with each other to generate heat and the exhaust gas can be heated, the temperature sensor 71 and the temperature controller 72 are not necessarily required.

In Reference Examples 1 and 2 , the discharge plasma described in Embodiment 1 is used as a hydrocarbon reformer that reforms at least part of saturated hydrocarbons in blow-by gas or fuel evaporative gas into unsaturated hydrocarbons. Although the case where the reforming device 31 is used has been described, the same packed bed type discharge plasma reforming device 37 as that described in the present embodiment may be used, and the heater 51 is not necessary and the device is simplified. The effect is obtained.

Reference Example 3
FIG. 11 is a diagram for explaining the exhaust gas processing device and the exhaust gas processing method according to Reference Example 3 , and more specifically, is a configuration diagram showing the configuration of the exhaust gas processing device.
In this reference example , a catalytic reformer 39 is used as a hydrocarbon reformer that reforms at least a part of saturated hydrocarbons in exhaust gas into unsaturated hydrocarbons. Since other configurations are the same as those of the first embodiment, differences from the first embodiment will be mainly described below.

  For example, literature (K. Wakui, K. Satoh, G. Sawada, K. Shiozawa, K. Matano, K. Suzuki, T. Hayakawa, Y. Yoshimura, K. Murata and F. Mizukami: "Cracking of n-butane over In alkaline earth-containing HZSM-5 catalysts ", Catalysis Letters (EN), 2002, Vol.84, No.3-4, p.259-264), ZSM-5 is used as the catalyst and is unsaturated. A technique for reforming butane, which is a hydrocarbon, to propylene or ethylene at 600 ° C. or higher is described. Japanese Patent Publication No. 46-10064 discloses a method of adjusting ZSM-5.

The catalytic reformer 39 according to the present reference example is filled with the above ZSM-5 type catalyst, and is configured such that exhaust gas passes therethrough. As the shape of the ZSM-5 type catalyst, for example, ZSM-5 is formed into a film shape on the surface of a cordierite honeycomb-type substrate filled with an exhaust pipe using a number of spherical and cylindrical solidified materials. A coated one can be used.

  Hot exhaust gas exhausted from the engine 1 passes through the exhaust manifold 2 and enters the catalytic reformer 39. Since the exhaust gas is at a high temperature, the catalytic reformer 39 is heated, and when ZSM-5 inside the device is heated to 600 ° C. or higher, it functions as a catalyst for reforming saturated hydrocarbons to unsaturated hydrocarbons. For example, butane which is a saturated hydrocarbon contained in exhaust gas can be reformed to propylene or ethylene. Thereafter, the modified exhaust gas passes through the exhaust pipe 8 and is introduced into the discharge plasma activation device 41. In the discharge plasma activation device 41, plasma processing is effectively promoted by propylene. The configuration downstream of the discharge plasma activation device 41 is the same as that of the first embodiment.

Thus, in this reference example , the catalytic reformer 39 is used as a hydrocarbon reformer that reforms at least a part of the saturated hydrocarbons in the exhaust gas into unsaturated hydrocarbons. Compared with the use of the discharge plasma reforming apparatus 31 as in the first embodiment, an effect that the apparatus becomes simple can be obtained.

  The catalyst for reforming saturated hydrocarbons to unsaturated hydrocarbons is not limited to ZSM-5. Further, the processing temperature of the catalytic reformer 39 is not limited to 600 ° C. or more, and varies depending on the catalyst used.

In Reference Examples 1 and 2 , the discharge plasma described in Embodiment 1 is used as a hydrocarbon reformer that reforms at least part of saturated hydrocarbons in blow-by gas or fuel evaporative gas into unsaturated hydrocarbons. Although the case where the reforming device 31 is used has been described, a catalytic reforming device 39 similar to that described in the present reference example may be used, and the effect of simplifying the device can be obtained.

Reference Example 4
FIG. 12 is a diagram for explaining an exhaust gas treatment device and an exhaust gas treatment method according to Reference Example 4 , and more specifically, a configuration diagram showing a configuration of the exhaust gas treatment device.
In the first embodiment, the discharge plasma reformer 41 is used as the exhaust gas activation device 4 that converts at least a part of harmful components in the exhaust gas into a highly reactive gas. However, in this reference example , an air pump is used. 81, an ozone generator 82, and an ozone supply nozzle 84 are connected in this order to an ozone supply line (corresponding to one having means for injecting ozone into exhaust gas). Since other configurations are the same as those of the first embodiment, differences from the first embodiment will be mainly described below.

  In FIG. 12, the exhaust manifold 2, the discharge plasma reformer 31, the catalytic purification device 5, and the silencer 6 are arranged in this order on the exhaust gas exhaust path from the engine 1 to the exhaust gas outlet 7. An exhaust pipe 8 connects the exhaust manifold 2 to the exhaust gas outlet 7. Exhaust gases exhausted from the engine 1 are combined into one by the exhaust manifold 2. The combined exhaust gas passes through the exhaust pipe 8 from the discharge plasma reforming device 31 and is introduced into the catalytic purification device 5.

On the other hand, an ozone supply line in which an air inlet 80, an air pump 81, an ozone generator 82, and an ozone injection nozzle 84 are connected in order is configured, and the ozone injection nozzle 84 is installed inside the exhaust pipe 8. The ozone generator 82 is connected to an ozone generation power source 83. In this reference example , the ozone supply line corresponds to an exhaust gas activation device.
The ozone generator 82 and the ozone generating power supply 83 can use various known devices and methods. As an example, the ozone generator 82 is a silent discharge type ozonizer, the ozone generation power supply 83 is a high voltage power supply, the ozone generator 82 is an electrolytic ozone generator, and the ozone generation power supply 83 is a DC power supply. Combinations can be used.

By the way, since the heat of the exhaust gas is radiated in the exhaust pipe 8, the exhaust gas is cooled. Since the NO ₂ is efficiently generated when the temperature of the exhaust gas is 400 ° C. or less at the ozone injection nozzle 84, the discharge plasma reforming apparatus is adapted to cool the exhaust gas to 400 ° C. or less by the exhaust pipe 8. The length of the exhaust pipe 8 from 31 to the ozone injection nozzle 84 may be determined.

Next, the operation of the exhaust gas processing apparatus configured as described above will be described.
Hot exhaust gas exhausted from the engine 1 passes through the exhaust manifold 2 and enters the discharge plasma reformer 31. Here, as described in the first embodiment, at least a part of the saturated hydrocarbons in the exhaust gas is converted into unsaturated hydrocarbons, that is, reformed. The exhaust gas at least partly reformed into unsaturated hydrocarbon is cooled to 400 ° C. or lower when passing through the exhaust pipe 8.

On the other hand, air taken from the air inlet 80 in the ozone supply line is introduced into the ozone generator 82 by the air pump 81. Here, ozone (O ₃ ) is generated to obtain ozonized air. The ozonized air is injected into the exhaust pipe 8 through the ozone injection nozzle 84. When the ozonized air is mixed with the modified exhaust gas inside the exhaust pipe 8, a part of ozone is dissociated and (O ^* ) is generated.
O ₃ → O ^* + O ₂
This O ^* reacts with unsaturated hydrocarbons in the exhaust gas to generate a reducing gas such as formaldehyde. A part of the ozone reacts directly with NO gas to generate NO ₂ as an oxidizing gas.
As a result, the reducing gas and the oxidizing gas are obtained, and the exhaust gas can be cleaned by injecting these gases into the catalytic purification device 5 as described in the first embodiment.

As described above, according to this reference example , ozonized air is equivalent to the above-described discharge plasma treatment by injecting and mixing at least a part of saturated hydrocarbons into exhaust gas that has been reformed into unsaturated hydrocarbons. Exhaust gas activation action can be obtained, and the exhaust gas can be efficiently cleaned by the subsequent catalytic purification device 5.
Furthermore, if the ozone generator 82 is of the electrolytic ozone generator, unlike the silent discharge type ozone generator, does not contain NO _x within the ozonation air, NO _x to be decomposed in the catalytic purifier 5 Since the amount is less than that of the silent discharge type, the catalytic purification device 5 can achieve efficient decomposition.

In the above description, the case where the ozone supply line is used instead of the discharge plasma reforming apparatus 41 in the exhaust gas treatment apparatus shown in FIG. 2 of the first embodiment has been described. In any of the exhaust gas treatment apparatuses described in Embodiment 2 and Reference Examples 1 to 3 , an ozone supply line may be used instead of the discharge plasma reforming apparatus 41, and the same effect is obtained.

Reference Example 5
FIG. 13 is a diagram for explaining an exhaust gas treatment device and an exhaust gas treatment method according to Reference Example 5 , and more specifically, a configuration diagram showing a configuration of the exhaust gas treatment device.
In the first embodiment, using discharge plasma reformer 41 at least part of the harmful components in the exhaust gas as the exhaust gas activation device 4 for converting the highly reactive gas, in the present reference example, the exhaust pipe 8 uses an ultraviolet lamp 90 (corresponding to means for irradiating exhaust gas with ultraviolet rays). Since other configurations are the same as those of the first embodiment, differences from the first embodiment will be mainly described below.

  In FIG. 13, the exhaust manifold 2, the discharge plasma reformer 31, the ultraviolet lamp 90, the catalytic purification device 5, and the silencer 6 are arranged in this order on the exhaust gas exhaust path from the engine 1 to the exhaust gas outlet 7. . An exhaust pipe 8 connects the exhaust manifold 2 to the exhaust gas outlet 7. Exhaust gases exhausted from the engine 1 are combined into one by the exhaust manifold 2. The exhaust gas combined into one passes through the exhaust pipe 8 provided with the ultraviolet lamp 90 from the discharge plasma reformer 31 and is irradiated with ultraviolet rays by the ultraviolet lamp 90. Then, the exhaust gas passing through here is introduced into the catalytic purification device 5.

  As the means for irradiating the exhaust gas with ultraviolet rays, any known ultraviolet lamp may be used. For example, an ultraviolet lamp for generating ozone, which emits ultraviolet rays with a low wavelength, is preferably used. .

By the way, the heat of the exhaust gas is radiated in the exhaust pipe 8 and the exhaust gas is cooled. Since NO ₂ is efficiently generated when the temperature of the exhaust gas is 400 ° C. or less at the ultraviolet lamp 90 portion, the length of the exhaust pipe 8 is set so that the exhaust gas is cooled to 400 ° C. or less by the exhaust pipe 8. It is good to decide.

Next, the operation of the exhaust gas processing apparatus configured as described above will be described.
Hot exhaust gas exhausted from the engine 1 passes through the exhaust manifold and enters the discharge plasma reformer 31. Here, as described in the first embodiment, at least a part of the saturated hydrocarbons in the exhaust gas is converted into unsaturated hydrocarbons, that is, reformed. The exhaust gas at least partly reformed into unsaturated hydrocarbon is cooled when passing through the exhaust pipe 8 and becomes 400 ° C. or less around the ultraviolet lamp 90.

Subsequently, when the modified exhaust gas passes in the vicinity of the ultraviolet lamp 90, the light having a low wavelength from the ultraviolet lamp 90 dissociates a part of oxygen contained in the exhaust gas to generate O ^* . .
O ₂ + UV → 2O ^*
Among these, some O ^* are combined with oxygen molecules to become ozone (O ₃ ).
O ^* + O ₂ → O ₃
Ozone (O ₃ ) diffuses inside the exhaust pipe 8 and mixes with the exhaust gas. Part of the mixed ozone is dissociated again by the heat of the exhaust gas and O ^* is generated.
O ₃ → O ^* + O ₂
This O ^* reacts with the unsaturated hydrocarbon in the exhaust gas to generate a reducing gas such as formaldehyde. A part of the ozone reacts directly with NO gas to generate NO ₂ as an oxidizing gas.
As a result, the reducing gas and the oxidizing gas are obtained, and the exhaust gas can be cleaned by injecting these gases into the catalytic purification device 5 as described in the first embodiment.

As described above, according to this reference example , the modified exhaust gas is irradiated with ultraviolet rays by the ultraviolet lamp 90, thereby generating O ^* and obtaining an exhaust gas activation effect equivalent to that of the above-described discharge plasma treatment. Therefore, the exhaust gas can be efficiently cleaned by the catalytic purification device 5 at the subsequent stage.
Furthermore, the ultraviolet lamp 90 is only installed inside the exhaust pipe 8, and the effect of reducing the number of components and simplifying the entire apparatus can be obtained.

In the above description, in the exhaust gas processing apparatus shown in FIG. 2 of the first embodiment, the case where the means for irradiating the exhaust gas with ultraviolet rays is used instead of the discharge plasma reforming apparatus 41 is described. In any of the exhaust gas treatment apparatuses described in Embodiment 2 and Reference Examples 1 to 3 , a means for irradiating the exhaust gas with ultraviolet rays may be used in place of the discharge plasma reforming apparatus 41. The effect is obtained.

Reference Example 6
FIG. 14 is a diagram for explaining an exhaust gas treatment device and an exhaust gas treatment method according to Reference Example 6 , and more specifically, a configuration diagram showing a configuration of the exhaust gas treatment device.
In the first embodiment, using discharge plasma reformer 41 at least part of the harmful components in the exhaust gas as the exhaust gas activation device 4 for converting the highly reactive gas, in the present reference example, the exhaust pipe An ultraviolet lamp 90 (corresponding to means for irradiating the exhaust gas with ultraviolet rays) and a photocatalyst 91 installed on the inner wall of the exhaust pipe 8 are used. Since other configurations are the same as those of the first embodiment, differences from the first embodiment will be mainly described below.

In FIG. 14, the exhaust manifold 2, the discharge plasma reformer 31, the ultraviolet lamp 90 and the photocatalyst 91, the catalytic purification device 5, and the silencer 6 are arranged in this order on the exhaust gas exhaust path from the engine 1 to the exhaust gas outlet 7. Has been. An exhaust pipe 8 connects the exhaust manifold 2 to the exhaust gas outlet 7.
Exhaust gases exhausted from the engine 1 are combined into one by the exhaust manifold 2. The exhaust gas combined into one passes through the exhaust pipe 8 in which the ultraviolet lamp 90 and the photocatalyst 91 are installed from the discharge plasma reforming device 31 and is irradiated with ultraviolet rays by the ultraviolet lamp 90, and at the same time, A part contacts the photocatalyst 91. Then, the exhaust gas passing through here is introduced into the catalytic purification device 5.

As the means for irradiating the exhaust gas with ultraviolet rays, as in the case of Reference Example 5 , for example, an ultraviolet lamp for generating ozone, which emits ultraviolet rays with a low wavelength, is preferably used. As the photocatalyst 91, for example, a known TiO ₂ catalyst or the like can be used.

By the way, since the heat of the exhaust gas is radiated in the exhaust pipe 8, the exhaust gas is cooled. Since the NO ₂ gas is effectively generated when the exhaust gas temperature is 400 ° C. or less at the ultraviolet lamp 90 portion, the length of the exhaust tube 8 is set so that the exhaust gas is cooled to 400 ° C. or less by the exhaust tube 8. It is good to decide.

Next, the operation of the exhaust gas processing apparatus configured as described above will be described.
Hot exhaust gas exhausted from the engine 1 passes through the exhaust manifold and enters the discharge plasma reformer 31. Here, as described in the first embodiment, at least a part of the saturated hydrocarbons in the exhaust gas is converted into unsaturated hydrocarbons, that is, reformed. The exhaust gas at least partly reformed into unsaturated hydrocarbons is cooled when passing through the exhaust pipe 8 and becomes 400 ° C. or less around the ultraviolet lamp 90 and the photocatalyst 91.

When the exhaust gas modified by the discharge plasma reforming apparatus 31 passes in the vicinity of the ultraviolet lamp 90, the exhaust gas treatment is performed by irradiating the exhaust gas with the light of the ultraviolet lamp 90, and the light of the ultraviolet lamp 90 is irradiated. Two treatments of exhaust gas treatment by contacting exhaust gas with the photocatalyst 91 can be performed.
Exhaust gas treatment that generates reducing gas such as formaldehyde and NO ₂ that is oxidizing gas by irradiation of the ultraviolet lamp 90 is the same as that in Reference Example 4, and thus the description thereof will be omitted. Exhaust gas treatment by irradiation of the lamp 90 will be described.
When the light of the ultraviolet lamp 90 irradiates the photocatalyst 91, water in the exhaust gas is dissociated on the surface of the photocatalyst 91 to generate OH ^* . This OH ^* reacts with the unsaturated hydrocarbon in the reformed exhaust gas to generate a reducing gas such as formaldehyde, similarly to the above-described O ^* .
As a result, reducing gas and oxidizing gas can be obtained. As described in the first embodiment, the exhaust gas can be purified by injecting these gases into the catalytic purification device 5.

As described above, according to the present reference example , by combining the treatment with the ultraviolet irradiation from the ultraviolet lamp 90 and the treatment with the photocatalyst 90, the modified exhaust gas is more efficiently exhausted than the treatment with the ultraviolet irradiation alone. Can be cleaned.

In the above, in the exhaust gas processing apparatus shown in FIG. 2 of the first embodiment, the case where the means for irradiating the exhaust gas with ultraviolet rays and the photocatalyst 91 are used instead of the discharge plasma reforming apparatus 41 has been described. However, the present invention is not limited to this, and in any of the exhaust gas treatment apparatuses described in Embodiment 2 and Reference Examples 1 to 3 , a means for irradiating the exhaust gas with ultraviolet rays instead of the discharge plasma reforming apparatus 41 and the photocatalyst 91. And the same effect can be obtained.

Reference Example 7
FIG. 15 is a diagram for explaining an exhaust gas treatment device and an exhaust gas treatment method according to Reference Example 7 , and more specifically, a configuration diagram showing a configuration of the exhaust gas treatment device.
In this reference example , a cooling means (cooling device 100) for cooling the exhaust gas introduced into the exhaust gas activation device 4 (discharge plasma activation device 41) is provided. Since other configurations are the same as those of the first embodiment, differences from the first embodiment will be mainly described below.

Since the heat of the exhaust gas is dissipated in the exhaust pipe 8, the exhaust gas is cooled. However, in this reference example , in order to enhance the cooling effect, the cooling device 100 is provided in front of the plasma processing apparatus 41 to activate the exhaust gas. The exhaust gas introduced into the device (discharge plasma activation device 41) is cooled.
As the cooling device 100, for example, a heat exchanger provided with a radiator plate, a heat exchanger using cooling water, or the like can be used.

Thus, according to this reference example , since the cooling means for cooling the exhaust gas introduced into the exhaust gas activation device is provided, the temperature of the exhaust gas can be reliably and sufficiently lowered, and NO can be reduced. It can be efficiently converted to NO ₂ which is a highly reactive oxidizing gas. As a result, it is possible to obtain an effect that the exhaust gas cleaning in the subsequent catalytic purification device 5 is further promoted.

In the above, the exhaust gas treatment apparatus described in the first embodiment includes the cooling means (cooling apparatus 100) for cooling the exhaust gas introduced into the exhaust gas activation apparatus 4 (discharge plasma activation apparatus 41). However, the present invention is not limited to this, and in any of the exhaust gas treatment apparatuses described in the second embodiment and the reference examples 1 to 6 , the exhaust gas introduced into the exhaust gas activation apparatus 4 is cooled. Cooling means (cooling device 100) may be provided, and the same effect can be obtained.

Reference Example 8
FIG. 16 is a diagram for explaining an exhaust gas treatment device and an exhaust gas treatment method according to Reference Example 8 , and more specifically, a configuration diagram showing a configuration of the exhaust gas treatment device.
In this reference example , the hydrocarbon reformer (exhaust gas reformer 3) is provided with heating means (heater 110). Since other configurations are the same as those of the first embodiment, differences from the first embodiment will be mainly described below.

The exhaust gas reformer 3 is provided with a heater 110 and a temperature sensor 111 so as to measure the gas temperature inside the exhaust gas reformer 3. Further, the temperature sensor 111 and the heater 110 are connected to a temperature controller 112 and operate so that the gas inside the exhaust gas reforming apparatus 3 reaches a set temperature.
As the heating means (heater 100), a known electric heater or the like may be used.
When the exhaust gas reformer 3 is the discharge plasma reformer 31, the set temperature is preferably higher than 400 ° C.

In such a configuration, the exhaust gas that has passed through the engine 1 and the exhaust manifold 2 is introduced into the exhaust gas reformer 3. The temperature sensor 111 detects the temperature of the exhaust gas introduced into the exhaust gas reforming apparatus 3. When the detected temperature is equal to or lower than the set temperature, the temperature controller 112 supplies current to the heater 110 to heat the exhaust gas temperature to the set temperature. This heating promotes reforming of the exhaust gas in the exhaust gas reforming apparatus 3.
The exhaust gas reformed by the exhaust gas reforming device 3 is introduced into the exhaust gas activation device 4 through the exhaust pipe 8.
The operation downstream of the exhaust gas activation device 4 is the same as that in the first embodiment.

  Depending on the operation of the engine 1, the temperature of the exhaust gas exhausted from the engine 1 may be, for example, 400 ° C. or less, such as when starting or when the automobile runs at a low speed. Thus, even when the temperature of the exhaust gas is low, a sufficient reforming effect can be obtained by providing the heater 110 and heating from the outside so that the exhaust gas temperature is higher than 400 ° C.

In the above description, the case where the discharge gas reforming apparatus 31 corresponding to the hydrocarbon reforming apparatus (exhaust gas reforming apparatus 3) is provided with the heater 100 in the exhaust gas processing apparatus described in the first embodiment has been described. However, the present invention is not limited to this, and in any of the exhaust gas treatment apparatuses of Reference Examples 4 to 7 , the discharge plasma reforming apparatus 31 may be provided with the heater 100, and the same effect can be obtained.
Furthermore, the heater 100 may be provided in the catalytic reformer 39 corresponding to the hydrocarbon reformer (exhaust gas reformer 3) described in Reference Example 3 . In this case, it is preferable that the gas space inside the catalytic reformer 39 is 600 ° C. or higher, and the same effect as when the heater 100 is provided in the discharge plasma reformer 31 can be obtained.

Reference Example 9
FIG. 17 is a diagram for explaining an exhaust gas treatment device and an exhaust gas treatment method according to Reference Example 9 , and more specifically, a configuration diagram showing a configuration of the exhaust gas treatment device.
In this reference example , the early activation catalytic purification device 120 is provided in the upper stage of the hydrocarbon reformer (exhaust gas reformer 3). Since other configurations are the same as those of the first embodiment, differences from the first embodiment will be mainly described below.

  In FIG. 17, an exhaust manifold 2, an early activation catalytic purification device 120, an exhaust gas reforming device 3, an exhaust gas activation device 4, and a catalytic purification device are disposed in an exhaust gas exhaust path from the engine 1 to the exhaust gas outlet 7. 5 and the silencer 6 are arranged in this order. An exhaust pipe 8 connects the exhaust manifold 2 to the exhaust gas outlet 7. Exhaust gases exhausted from the engine 1 are combined into one by the exhaust manifold 2. The exhaust gas combined into one is introduced into the early activation catalytic purification device 120.

As the early activation catalytic purification device 120, the exhaust pipe 8 is filled with a plurality of known three-way catalysts, oxidation catalysts using Pt, or the like formed into a spherical or cylindrical shape, The exhaust pipe 8 can be filled with a catalyst such as that described above applied to the surface of a cordierite base material formed into a honeycomb shape.
In addition, by connecting the early activation catalytic purification device 120 directly to the exhaust manifold 2, the high-temperature exhaust gas exhausted from the engine 1 is quickly introduced into the catalyst. For this reason, this catalyst which is cold at the time of engine starting can be heated rapidly, and can be raised to the temperature at which the catalyst functions in a short time.

The exhaust gas that has passed through the early activation catalytic purification device 120 passes through the exhaust gas reformer 3 and the exhaust pipe 8 and is introduced into the exhaust gas activation device 4. At this time, since the heat of the exhaust gas is radiated through the exhaust pipe 8, the exhaust gas is cooled. Since the exhaust gas activation device 4 efficiently generates NO ₂ when the exhaust gas temperature is 400 ° C. or lower, the length of the exhaust pipe 8 is such that the exhaust gas is cooled to 400 ° C. or lower by the exhaust pipe 8. It is good to decide.

Next, an example of an operation method of the exhaust gas processing apparatus configured as described above will be described.
The exhaust gas that has passed through the engine 1 and the exhaust manifold 2 is introduced into the early activation catalytic purification device 120, and part of the exhaust gas is cleaned by the catalyst in the early activation catalytic purification device 120. Thereafter, the exhaust gas is introduced into the exhaust gas reformer 3, and at least a part of the saturated hydrocarbons contained in the exhaust gas is reformed into unsaturated hydrocarbons. Then, the exhaust gas that has passed through the exhaust gas reformer 3 and the exhaust pipe 8 is introduced into the exhaust gas activation device 4. The exhaust gas that has passed through the exhaust gas activation device 4 is introduced into the catalytic purification device 5, but the subsequent operation is the same as in the first embodiment.

A part of the exhaust gas is purified to CO ₂ , N ₂ , and H ₂ O by the early activation catalytic purification device 120. Therefore, the density | concentration of the harmful gas component in exhaust gas falls. Also, paying attention to the remaining hydrocarbons, hydrocarbons such as toluene and benzene having a large mass are oxidized by this early active catalytic purification device 120 to convert them into hydrocarbons having a small mass, or to reduce CO. Or convert.
As a result, the exhaust gas reformer 3 can reform hydrocarbons having a small mass. In the absence of the early activation catalytic purification device 120, the exhaust gas reformer 3 not only reforms a small mass of hydrocarbons, but also decomposes a large mass of hydrocarbons into small mass molecules. However, if there is no large mass of hydrocarbon, it can be reformed efficiently with less reforming energy.

As described above, in this reference example , the early activation catalytic purification device 120 is provided in the upper stage of the hydrocarbon reformer (exhaust gas reformer 3). It can be efficiently modified with energy.

In the above description, the exhaust gas treatment apparatus described in the first embodiment has been described with respect to the case where the early activation catalytic purification device 120 is provided in the upper stage of the exhaust gas reforming apparatus 3 (discharge plasma reforming apparatus 31). However, the present invention is not limited to this, and in any of the exhaust gas treatment apparatuses of Reference Examples 4 to 8 , the early activation catalytic purification device 120 may be provided in the upper stage of the discharge plasma reforming device 31, and the same effect is obtained. Is obtained.
Further, the discharge plasma reforming is performed in the upper stage of the packed bed type discharge plasma reforming device 37 and the catalytic reforming device 39 which are the hydrocarbon reforming device (exhaust gas reforming device 3) described in the third embodiment and the reference example 3. An early activation catalytic purification device 120 may be provided in the upper stage of the quality device 31.

In Reference Examples 1 and 2 , a blow-by gas supply device, a fuel evaporative gas supply device, and a hydrocarbon reformer (exhaust gas reformer 3) may be provided, and the same effect can be obtained.

Reference Example 10
FIG. 18 is a diagram for explaining an exhaust gas treatment device and an exhaust gas treatment method according to Reference Example 10 , and more specifically, a configuration diagram showing a configuration of the exhaust gas treatment device.
In this reference example , as a hydrocarbon reformer (exhaust gas reformer) that reforms at least a part of saturated hydrocarbons in exhaust gas into unsaturated hydrocarbons, the discharge space is filled with a catalyst. A catalyst-packed discharge plasma reformer 300 configured to generate silent discharge in the filled space is provided. Since other configurations are the same as those of the first embodiment, differences from the first embodiment will be mainly described below.

In FIG. 18, an exhaust manifold 2, a catalyst-filled discharge plasma reformer 300, an exhaust gas activation device 4, a catalytic purification device 5, a silencer are disposed in an exhaust gas exhaust path from the engine 1 to the exhaust gas outlet 7. 6 are arranged in this order. The exhaust manifold 2 is connected to the exhaust gas outlet 7 through an exhaust pipe 8. Exhaust gases exhausted from the engine 1 are combined into one by the exhaust manifold 2. The combined exhaust gas is introduced into the catalyst-filled discharge plasma reformer 300.
Subsequently, the exhaust gas reformed by the catalyst-filling type discharge plasma reforming apparatus 300 passes through the exhaust pipe 8 and is introduced into the exhaust gas activation apparatus 4. The configuration downstream of the exhaust gas activation device 4 is the same as that of the first embodiment.

FIG. 19 is a perspective view showing a specific configuration of the catalyst-filled type discharge plasma reforming apparatus 300 with a part thereof broken. As shown in FIG. 19, the catalyst-filled type discharge plasma reforming apparatus 300 has a configuration in which the discharge space of the discharge plasma processing apparatus shown in FIG. 3 is filled with ZSM-5 beads 150 as a catalyst.
Further, a high-voltage power supply (not shown) is connected to the catalyst-filled discharge plasma reforming apparatus 300 via a plasma generation control apparatus 310. The plasma generation control device 310 monitors the generation of the high voltage power source and the discharge plasma, or controls the high voltage power source based on information such as the engine speed and the exhaust gas temperature to control the discharge plasma reforming device 31 and The start and stop of the discharge plasma activation device 32 and the plasma generation amount are controlled. Note that the voltage applied to the exhaust gas reforming apparatus 300 may be either an alternating high voltage or a pulsed high voltage.

Next, an example of an operation method of the exhaust gas processing apparatus configured as described above will be described.
The exhaust gas that has passed through the engine 1 and the exhaust manifold 2 is introduced into the catalyst-filled discharge plasma reformer 300. Here, at least a part of the saturated hydrocarbons in the exhaust gas is reformed into unsaturated hydrocarbons by the action of the ZSM-5 catalyst and the discharge plasma treatment. As described above, the reforming of saturated hydrocarbons into unsaturated hydrocarbons by the ZSM-5 catalyst and the reforming of saturated hydrocarbons into unsaturated hydrocarbons by the discharge plasma treatment are performed in this catalyst-filled discharge plasma reforming. It can be performed simultaneously with the apparatus 300.
Then, the exhaust gas that has passed through the catalyst-filled discharge plasma reforming apparatus 300 and the exhaust pipe 8 is introduced into the exhaust gas activation apparatus 4. The exhaust gas that has passed through the activation device 4 is introduced into the catalytic purification device 5, but the subsequent operation is the same as in the first embodiment.

  With the catalyst-packed discharge plasma reforming apparatus 300, both reforming by the catalyst and reforming by the discharge plasma treatment can be performed simultaneously by one apparatus. As a result, it is possible to achieve the effect that exhaust gas reforming can be achieved with less discharge power than in the case of the discharge plasma treatment alone.

In this reference example, it is desirable that the treatment temperature of the catalyst-filled type discharge plasma reforming apparatus 300 is 600 ° C. or higher at which the ZSM-5 catalyst acts effectively.

In the above description, in the exhaust gas treatment apparatus described in the first embodiment, the case where the catalyst-filled discharge plasma reforming apparatus 300 is used instead of the discharge plasma reforming apparatus 31 has been described. Instead, in any of the exhaust gas treatment apparatuses of Embodiment 2, Reference Example 1, Reference Example 2, and Reference Examples 4 to 9 , a catalyst-packed discharge plasma reforming apparatus 300 is used instead of the discharge plasma reforming apparatus 31. The same effect can be obtained.

  The exhaust gas treatment apparatus according to the present invention is not limited to the exhaust gas purification process from the automobile engine described in the above embodiments, but is an exhaust gas exhausted from an internal combustion engine such as a ship or a diesel generator. In addition, the present invention can be applied to purification treatment of exhaust gas exhausted from thermal power generation or the like. Further, the present invention can be applied to a purification process of exhaust gas exhausted from a combustion apparatus such as an incinerator.

1 is a configuration diagram showing a basic configuration of an exhaust gas treatment apparatus according to Embodiment 1 of the present invention. It is a block diagram which shows the specific structure of the exhaust-gas processing apparatus by Embodiment 1 of this invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view illustrating a specific configuration of a discharge plasma reforming apparatus and a discharge plasma activation apparatus, partially broken, according to Embodiment 1 of the present invention. It is a graph which concerns on Embodiment 1 of this invention and shows the result of having analyzed the exhaust gas before and behind discharge plasma modification processing with the infrared absorption photometer. It is a graph which concerns on Embodiment 1 of this invention and shows the relationship between temperature and the production amount of ethylene and propylene. It is a cross-sectional block diagram which shows typically the structure of the principal part of the exhaust gas processing apparatus by Embodiment 2 of this invention. It is a block diagram which shows the structure of the exhaust-gas processing apparatus by the reference example 1. FIG. FIG. 6 is a configuration diagram showing a configuration of an exhaust gas treatment device according to Reference Example 2 . It is a block diagram which shows the structure of the exhaust gas processing apparatus by Embodiment 3 of this invention. FIG. 10 is a perspective view showing a specific configuration of a packed bed type discharge plasma reforming apparatus, with a part thereof broken, according to a third embodiment of the present invention. FIG. 10 is a configuration diagram showing a configuration of an exhaust gas treatment device according to Reference Example 3 . FIG. 6 is a configuration diagram showing a configuration of an exhaust gas treatment device according to Reference Example 4 ; FIG. 6 is a configuration diagram showing a configuration of an exhaust gas treatment device according to Reference Example 5 . FIG. 10 is a configuration diagram showing a configuration of an exhaust gas treatment device according to Reference Example 6 . FIG. 10 is a configuration diagram showing a configuration of an exhaust gas treatment device according to Reference Example 7 . 10 is a configuration diagram illustrating a configuration of an exhaust gas treatment device according to Reference Example 8. FIG. 10 is a configuration diagram showing a configuration of an exhaust gas treatment device according to Reference Example 9. FIG. 10 is a configuration diagram showing a configuration of an exhaust gas treatment device according to Reference Example 10. FIG. FIG. 16 is a perspective view showing a specific configuration of an exhaust gas reforming apparatus according to Reference Example 10 with a part broken away.

  DESCRIPTION OF SYMBOLS 1 Engine, 2 Exhaust manifold, 3 Exhaust gas reformer, 4 Exhaust gas activation device, 5 Catalytic purifier, 6 Silencer, 7 Exhaust gas outlet, 8 Exhaust pipe, 22 High voltage electrode, 23 mesh, 24 Ground Electrode, 31 Discharge plasma reforming device, 32 Plasma generation control device, 37 Packed bed type discharge plasma reforming device, 39 Catalytic reforming device, 41 Discharge plasma activation device, 42 Plasma generation control device, 50 Blow-by gas supply device , 51 heater, 52 reformed gas supply nozzle, 60 fuel tank, 61 fuel supply device, 62 fuel evaporative gas supply device, 64 reformed gas supply nozzle, 70 barium titanate beads, 71 temperature sensor, 72 temperature regulator, 81 Air pump, 82 ozone generator, 83 ozone generator, 84 ozone injection nozzle, 90 purple Line lamp, 91 Photocatalyst, 100 Cooling device, 110 Heater, 111 Temperature sensor, 112 Temperature controller, 120 Early activation catalytic purification device, 150 ZSM-5 beads, 200 Exhaust manifold, 300 Catalyst-filled discharge plasma reforming Apparatus, 310 Plasma generation control apparatus.

Claims (6)

Discharge plasma treatment apparatus for reforming at least part of saturated hydrocarbons in exhaust gas to unsaturated hydrocarbons, and exhaust gas activation apparatus for converting at least part of harmful components in exhaust gas into highly reactive gas And an exhaust gas treatment device comprising a catalyst type purifying device for purifying harmful components converted into highly reactive gas with a catalyst in order in an exhaust gas exhaust path. An exhaust gas activation device that converts at least a part of harmful components in the exhaust gas into highly reactive gas, and a catalytic purification device that cleans harmful components converted into highly reactive gas with a catalyst, A discharge plasma processing apparatus for sequentially preparing in the exhaust path and reforming at least a part of saturated hydrocarbons in blow-by gas into unsaturated hydrocarbons, and at least a part of the saturated hydrocarbons being reformed by the discharge plasma processing apparatus And means for adding the blowby gas to the exhaust gas. An exhaust gas activation device that converts at least a part of harmful components in the exhaust gas into highly reactive gas, and a catalytic purification device that cleans harmful components converted into highly reactive gas with a catalyst, A discharge plasma processing apparatus for sequentially preparing at the exhaust path and reforming at least a part of saturated hydrocarbons in the fuel evaporative gas into unsaturated hydrocarbons, and at least a part of the saturated hydrocarbons modified by the discharge plasma processing apparatus An exhaust gas processing apparatus, comprising: means for adding the refined fuel evaporative gas to the exhaust gas. The exhaust gas processing apparatus according to any one of claims 1 to 3, wherein a processing temperature of the discharge plasma processing apparatus is in a range of more than 400 ° C and not more than 650 ° C. The exhaust gas processing apparatus according to any one of claims 1 to 3, wherein the discharge plasma processing apparatus is a packed bed type discharge plasma processing apparatus. The exhaust gas processing apparatus according to any one of claims 1 to 3, wherein the exhaust gas activation apparatus is a second discharge plasma processing apparatus.

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