JP7418045B2 - Deodorizing equipment and method - Google Patents

Description

The present invention relates to deodorizing equipment and a deodorizing method for deodorizing odor gas.

The present invention is a deodorizing equipment for hydrophilic odorous gases containing persistent odorous components such as ammonia, aldehydes (acetaldehyde, propionaldehyde, formaldehyde, etc.), and organic acids.

As a method for removing the odor components from the gas, there is an adsorption method using an adsorbent such as activated carbon (mainly made from coconut shell, coal, wood flour, etc.). The adsorbent used in this adsorption method (activated carbon, etc.) has a low ability to adsorb odor components in its original state, so the adsorbent is treated with a chemical substance such as citric acid or caustic soda. As described above, since the activated carbon is impregnated with chemical substances, it is difficult to recycle the activated carbon, and the adsorption method has the problem of high running costs.

A gas-liquid contact method is an excellent method for removing odor components. The gas-liquid contact method takes advantage of the fact that the odor component is hydrophilic and brings the gas into contact with the liquid, thereby dissolving the odor component in the liquid and chemically deodorizing the odor component. . Examples of chemical deodorization include those based on acid/alkaline reactions that occur in liquids and oxidative decomposition reactions due to oxidizing substances contained in liquids (e.g. hypochlorous acid, hydrogen peroxide, ozone). .

Common gas-liquid contact methods include a filler shower method and a mist spray mixing method.

Filler shower type deodorizing equipment consists of a deodorizing tower with an odor gas supply port at the bottom and a deodorizing gas exhaust port at the top, a filling material installed inside the deodorizing tower, and an air outlet facing upward toward the filling material. A spray nozzle is provided to spray a chemical solution from the spray nozzle. The odor gas supplied to the deodorizing tower and the chemical solution injected from the nozzle are deodorized by contacting on the filler, and the deodorized gas is exhausted from the exhaust port. The chemical liquid that has been sprayed onto the filler and absorbed the deodorizing components falls into a circulation tank at the bottom of the deodorizing tower, and is then returned to the injection nozzle as a circulating liquid via a pump.

On the other hand, in the mist spray mixing method, for example, as in Patent Document 1 below, odor gas is supplied into a deodorizing tower or duct, a deodorizing liquid is sprayed onto the supplied odor gas, and the deodorizing liquid and the odor gas are caused to react. Deodorizes by doing this. A deodorant (chemical substance) decomposes or alters odor components, making them odorless.

Deodorization using the filler shower method or mist spray mixing method has the advantage of lower running costs than adsorption methods using activated carbon or the like.

Japanese Patent Application Publication No. 9-882

In the gas-liquid contact, it is desired to increase the gas-liquid contact efficiency, but the filler shower method has several problems as described below.

(filling material)
In order to increase the contact efficiency, it is necessary to increase the wetted area of the filler. Therefore, the size and volume of the deodorizing tower that houses the filler tends to increase, resulting in a problem of high initial cost.

Furthermore, although fillers with smaller sizes and higher density tend to have better contact efficiency, such fillers are more likely to be clogged by dust and reaction products. Therefore, it is necessary to use a filling material that is large in size (for example, the diameter and length of the Raschig ring are approximately 10 mm to 50 mm, respectively) and low density (porosity is approximately 60% to 80%). The problem is that there is no.

Furthermore, dust in the atmosphere, dirt in the circulating fluid, etc. can clog the filling material, increasing ventilation resistance. Therefore, there is a problem in that it is necessary to periodically replace and clean the filler.

(circulating fluid)
In order to maximize the contact efficiency of gas-liquid contact, it is necessary to set the gas-liquid ratio to about 2 to 5 L/m ³ and increase the amount of circulating water. Therefore, there is a problem that the power of the pump used for water circulation becomes large.

When the chemical is showered from the injection nozzle, fine mist is scattered and some of it evaporates, resulting in a high concentration of the chemical. Furthermore, when the odorous gas passes through the filling material, the odorous components are taken into the circulating fluid, and the chemicals in the circulating fluid react with the odorous components, making the odorous components odorless. Therefore, as the operating time of the deodorizing equipment increases, the concentration of a chemical having deodorizing ability present in the circulating fluid tends to decrease, and there is a problem in that the concentration of the chemical in the circulating fluid needs to be controlled. That is, there is a problem in that it is necessary to maintain a constant concentration of a chemical having deodorizing ability present in the circulating fluid in order not to reduce the deodorizing effect.

In addition, as the deodorizing equipment operates, sludge accumulates in the circulating fluid storage tank provided below the deodorizing tower, so there is also the problem that periodic cleaning of the tank and replacement of the circulating fluid are required.

(ventilation speed)
The slower the speed at which the odor gas passes through the filler, the longer the gas-liquid contact time and the higher the gas-liquid contact efficiency. It is also necessary to suppress loss of ventilation pressure. Therefore, it is necessary to slow down the ventilation speed of the odor gas to about 1.5 to 2.0 m/s.
However, when the ventilation speed is slowed down, there is a problem in that the amount of deodorizing treatment per unit time is reduced.

(Mist spray mixing method)
The mist spray mixing method is effective when the concentration of odor components in the odor gas is low, when the amount of odor gas is small, or when deodorizing is performed locally. However, due to the high cost of the deodorant, there is a problem that it is not suitable for cases where the odor gas is highly concentrated, the amount of odor gas is large, or the odor removal tower is large.

The present invention has been made in order to solve the above problems, and it is an object of the present invention to provide deodorizing equipment with high gas-liquid contact efficiency and high deodorizing effect.

The present invention that solves the above problems is as follows.

(1) Equipped with a gas-liquid contact filter that removes odor components from odor gas through gas-liquid contact,
The gas-liquid contact filter includes a plurality of bag-shaped filter units arranged in parallel,
The odor gas is supplied into each of the plurality of filter units, expands each filter unit, and flows out through the filtration surface of the expanded filter unit,
The filter unit is provided with a joint portion that joins opposing filtration surfaces,
The connecting portion suppresses expansion of the filter unit, thereby suppressing contact between the expanded filtration surface of the filter unit and the adjacent expanded filtration surface of the filter unit,
A deodorizing device characterized by:

(effect)
By providing the filter unit with a joint that suppresses expansion, more filter units can be arranged in parallel than when no joint is provided.

(2) The deodorizing device according to (1), wherein the joint portion is provided at least in a central portion of the filter unit.

(effect)
Providing a joint at the center of the filter unit is more effective in suppressing expansion of the filter unit than providing the joint at the end of the filter unit.

(3) The deodorizing device according to (1), wherein the joint portion is linearly provided along the flow direction of the odor gas supplied into the filter unit.

(effect)
Since the flow of odor gas is not blocked by the joint, turbulence is less likely to occur inside the filter unit, and the efficiency of removing odor components is increased.

(4) The gas-liquid contact filter is
The deodorizing device according to (1) above, which is a cartridge in which a plurality of the filter units are bundled and integrated.

(effect)
By making the filter unit a cartridge type, it becomes easy to replace and increase or decrease the filter unit.

(5) Deodorizing equipment equipped with the deodorizing device described in (1) above,
The deodorizing equipment has an ozone generator,
Ozone generated by the ozone generator is dissolved in a liquid and supplied to the gas-liquid contact filter,
Deodorizing equipment characterized by:

(effect)
By including ozone in the liquid supplied to the gas-liquid contact filter, deodorizing components can be easily removed. When ozone is used instead of an additive, the cost of the additive is not required, so running costs can be significantly reduced.

(6) A deodorizing equipment comprising the deodorizing device according to claim 1,
The deodorizing equipment has a humidifier,
The odor gas humidified by the humidifier is supplied to the deodorizer,
Deodorizing equipment characterized by:

(effect)
By humidifying the odor gas with a humidifier before supplying it to the deodorizer, the deodorizing effect of the deodorizer can be improved. That is, the mist ejected from the nozzle of the humidifier rapidly diffuses into the odorous gas and absorbs the hydrophilic odorous components of the odorous gas. Then, when the humidified odor gas passes through the gas-liquid contact filter, it mixes with the medicine in the circulating fluid, and a deodorizing reaction takes place. By humidifying the odorous gas in advance in this way, the efficiency of collecting odorous components in the odorous gas is increased, and a high deodorizing effect can be obtained.

According to the present invention, it is possible to provide deodorizing equipment with high gas-liquid contact efficiency and high deodorizing effect.

It is a schematic diagram of the deodorization equipment concerning the present invention. It is a schematic diagram of deodorization equipment. It is a side view of a deodorization device. It is a top view of a deodorization device. It is a front view of a deodorization device. FIG. 7 is a plan view showing variations in the installation pattern of filter units. FIG. 6 is a front view showing variations in the installation pattern of the joint portions. FIG. 3 is a plan view showing the filter unit in an expanded state.

Hereinafter, preferred embodiments of the deodorizing equipment 1 according to the present invention will be described with reference to the drawings. The following description and drawings merely show one example of the embodiment of the present invention, and the content of the present invention should not be interpreted as being limited to this embodiment.

(Deodorizing equipment 1)
An example of deodorizing equipment 1 according to the present invention is shown in FIG. The deodorizing equipment 1 includes a humidifier 2 that humidifies the odor gas F1, a deodorizer 4 that deodorizes the humidified odor gas F2, and the like. Below, the details of the deodorizing equipment 1 will be explained in detail.

(Odor gas FG)
Examples of the odor gas FG treated by the deodorizing equipment 1 include exhaust gas from waste incinerators and paint factories, rubber vulcanization exhaust gas, and aluminum melting furnace exhaust gas. Examples of the odor components in the odor gas FG include aldehydes (acetaldehyde, propionaldehyde, isobutyraldehyde, isoparealdehyde, formaldehyde, etc.), normal butyric acid, normal valeric acid, ammonia, and the like.

The odor gas FG is hydrophilic, and the odor component in the odor gas FG is a persistent substance that is difficult to decompose. Therefore, it is necessary to decompose and deodorize using strong oxidizing substances such as hydrogen peroxide and ozone.

(humidifier 2)
Before being deodorized by the deodorizing device 4, the humidifying device 2 humidifies the odor gas FG. The humidifier 2 in FIG. 1 has a horizontally long cylindrical shape, and the odor gas FG flows from the left side to the right side in the drawing. A spray pipe 3 is inserted into the humidifier 2 from above the humidifier 2, and a mist M is sprayed toward the odor gas FG (FG1) from a nozzle provided at the bottom of the spray pipe 3, thereby removing the odor. Humidify gas FG (FG1). The deodorizing device 4 in FIG. 1 has a structure in which two spray pipes 3 are inserted, and the nozzle of one spray pipe 3 sprays toward the air supply port, and the nozzle of the other spray pipe 3 sprays toward the exhaust port. . As described above, by providing two spray pipes 3 and configuring them to spray in opposite directions, it is possible to increase the amount of spray per unit air volume and uniformly diffuse the spray liquid. In this way, by spraying the mist M onto the odorous gas FG, the odorous gas FG (FG1) can be humidified. By spraying the mist M, the humidity of the odor gas FG (FG2) is preferably made to be 90% or more, more preferably 99% or more. If the humidity of the odor gas FG (FG2) is less than 90%, the sprayed liquid W2 will evaporate when sprayed from the spray nozzle 7 of the deodorizing device 4 in the latter stage , so the amount of sprayed liquid W2 will be increased. This is because the problem of having to do so arises.

(Deodorizing device 4)
The odor gas FG (FG2) humidified by the humidifier 2 is supplied to the deodorizer 4. This deodorizing device 4 is provided with an air supply port 5 at the top and an exhaust port 6 at the side. In the deodorizing device 4 shown in FIG. 1, an air supply port 5 is provided at the center of the ceiling of the container 22, and an exhaust port 6 is provided at the side of the middle portion of the container 22 in the height direction. A spray nozzle 7 for spraying the supply liquid W2 is provided in the upper part of the container 22, and a gas-liquid contact filter 8 is provided in the middle of the container 22. In addition, the supply liquid W2 sprayed from the spray nozzle 7 passes through the gas-liquid contact filter 8 and then falls downward, but this fallen liquid (reservoir liquid W3) is collected in a storage tank provided at the bottom of the container 22. It is stored in section 25.

(Spray nozzle 7)
The spray nozzle 7 is attached to a supply pipe 30 (piping). It is preferable to use a spray nozzle 7 in which the particle diameter (Ferret diameter) of the sprayed supply liquid W (W2) is approximately 0.1 mm to 0.7 mm. Specifically, a full conical nozzle (model number: UZUJP) manufactured and sold by Ikeuchi Co., Ltd., a full conical nozzle (model number: HHSJ) sold by Spraying System Japan LLC, etc. can be used. Although the number of supply pipes 30 and nozzles 7 to be installed is not particularly limited, it is preferable to arrange about two to three supply pipes 30 per deodorizing device. Further, it is preferable to arrange about 3 to 6 nozzles 7 per set of gas-liquid contact filters so that the supply liquid W (W2) is sprayed over the entire surface of the gas-liquid contact filters 8.

Although the components of the supply liquid W2 are not particularly limited, it is preferable to change them arbitrarily depending on the components of the odor gas FG2. For example, an additive AA such as a neutralizing agent or an oxidizing agent can be optionally added to the raw water W1 (tap water, pure water, etc.) and used as the supply liquid W2. Specifically, when the odor gas FG2 contains acetaldehyde as an odor component, it is preferable to use the supply liquid W2 containing hypochlorous acid or ozone. When the odor gas FG2 contains ammonia as an odor component, it is preferable to use the feed liquid W2 containing citric acid.

Since the odorous gas FG is a hydrophilic gas, it is preferable to always spray the supply liquid W2 onto the gas-liquid contact filter 8 to maintain the fibers of the gas-liquid contact filter 8 in a wet state. Further, the supply liquid W2 may be sprayed intermittently, but in that case, it is preferable to spray the next supply liquid W2 before the gas-liquid contact filter 8 dries.

Since the purpose of spraying the supply liquid W2 from the spray nozzle 7 is to wet the gas-liquid contact filter 8, a gas-liquid ratio of about 0.5 L/m ³ is sufficient. As mentioned above, the conventional gas-liquid ratio was 2 to 5 L/ ^m3 , but the gas-liquid ratio of the present invention is sufficient to be 0.5 L/ ^m3 or less, so the gas-liquid ratio is significantly smaller than the conventional one. It turns out. When the gas-liquid ratio becomes smaller, a portion of the stored liquid W3 can be extracted from the storage section 25 of the deodorizing device 4 and the amount of water returned to the spray nozzle 7 of the deodorizing device 4 (circulating water amount) can be reduced, so that the power of the pump 17 can be reduced. can be reduced.

Although the installation position of the spray nozzle 7 can be arbitrarily determined, it is preferable to provide the spray nozzle 7 at a position where the supply liquid W2 is supplied to the entire upper surface of the gas-liquid contact filter 8. In FIG. 5, one supply pipe 30 is provided on the upper left side and the upper right side in the width direction of the gas-liquid contact filter 8, and a spray nozzle 7 is attached to each supply pipe 30, 30. The injection port of the spray nozzle 7 is provided at an angle of 45 degrees downward and toward the center in the width direction. This angle can be changed arbitrarily, but in view of the supply to the entire gas-liquid contact filter 8, it is preferably about 45 degrees to 60 degrees. In addition, in FIG. 4, six spray nozzles 7 are provided on each side of the left and right sides in the width direction with a predetermined interval in the row direction, but the number of spray nozzles 7 can be changed arbitrarily. . From the viewpoint of supplying the supply liquid W2 to the entire gas-liquid contact filter 8, the spray nozzles 7 are preferably installed at intervals of approximately 1000 mm to 2000 mm in the line direction.

(Gas-liquid contact filter 8)
The gas-liquid contact filter 8 serves as a medium in which the odor gas FG2 and the supply liquid W2 come into gas-liquid contact. The deodorizing device 4 is significantly different from the conventional deodorizing device 4 using a filler in that a gas-liquid contact filter 8 is used.

The gas-liquid contact filter 8 is made up of a plurality of filter units 40 arranged in parallel. The deodorizing device 4 shown in FIG. 3 has a plurality of filter units 40 arranged in parallel from one end to the other end in the direction in which the deodorizing device 4 is arranged. The number of filter units 40 can be arbitrarily determined. There is a problem that when the number of filter units is small, the amount of deodorizing processing per unit time is reduced. On the other hand, when the number of filter units is large, the installation volume of the gas-liquid contact filter 8 becomes large, and there is a problem that the entire deodorizing device 4 becomes large.
The speed at which the odor gas FG passes through the gas-liquid contact filter 8 is preferably 0.05 to 0.3 m/s, more preferably 0.1 to 0.15 m/s. When the speed (ventilation speed) is lower than 0.05 m/s, there is a problem that the amount of deodorizing treatment per unit time decreases. Further, if the ventilation speed is faster than 0.15 m/s, there is a problem that the air passes through the gas-liquid contact filter 8 without being sufficiently deodorized.

In the deodorizing device 4 of FIG. 3, filter units 40 are arranged in parallel in a straight line from one end to the other end. In order to explain the arrangement of the filter unit 40 of the deodorizing device 4 of FIG. 3, a simplified diagram (plan view) is shown in FIG. 6(A). Note that since FIG. 6A is a simplified diagram for explanatory purposes, the number of filter units 40 is smaller than that in FIG. 3. Further, the shape of the top surface of the filter unit 40 is also represented by a single straight line for convenience.

In FIG. 6(A), each filter unit 40 extends linearly along the width direction of the deodorizing device 4. In FIG. That is, a plurality of filter units 40 are arranged inside the container 22, and the filter units 40 are arranged in parallel in a straight line from one end to the other end along the direction in which the deodorizing devices 4 are arranged. There is. In order to make the arrangement of the plurality of filter units 40 easier to understand, the arrangement direction of the filter units 40 is shown by a dotted virtual line L. This virtual line L is a line parallel to a line connecting the center points of each filter unit 40 in the width direction.

The arrangement form of the plurality of filter units 40 is not limited to the form shown in FIG. 6(A), but can be changed to any arrangement form. For example, as shown in FIG. 6(B), a plurality of filter units 40 may be arranged in a diagonal line shape from one end side to the other end side, that is, so that the virtual line L is oblique. Further, as shown in FIG. 6C, the plurality of filter units 40 may be arranged in a curved line from one end to the other end, that is, the virtual line L is a curved line. In addition, as shown in FIG. 6(D), a plurality of filter units 40 may be arranged in an annular shape along the circumferential direction of the deodorizing device 4, that is, so that the virtual line L is circular.

The surface area of each filter unit 40 is preferably 300 m ² /m ³ to 1000 m ² /m ³ , more preferably 480 m ² /m ³ to 800 ^{m 2} /m ³ . If the surface area is smaller than 300 m ² /m ³ , there is a problem that the deodorizing efficiency of the deodorizing device 4 deteriorates. Furthermore, if the surface area is larger than 1000 m ² /m ³ , there is a problem that the deodorizing device 4 becomes large.

The porosity of each filter unit 40 is preferably 80% to 98%, more preferably 85% to 90%. When the porosity is lower than 80%, there is a problem in that it is difficult for the odor gas FG to pass through the filter unit 40, and the odor gas FG remains. Further, if the porosity is higher than 98%, there is a problem that part of the odor gas FG passes through the filter unit 40 without being deodorized.

As the material of this filter unit 40, for example, fibers such as polyester, polyphenylene sulfide (PPS) resin, nylon, and rayon can be used. Further, it is preferable to use a material with good wettability (hydrophilic material) as the material. Wettability is indicated by measuring the contact angle θ between the solid surface and the tangent of the droplet, the interfacial tension γ _VS between solid/gas, the interfacial tension γ LV between liquid/gas, and the interfacial tension γ _LV between liquid/solid. Determined by interfacial tension γ _LS . The relationship between this contact angle and interfacial tension can be expressed by the following equation 1 (Young's equation).
γ _VS = γ _LS + γ _LV cosθ ...Formula 1

In addition, for water-repellent materials (materials with a contact angle θ of 90 degrees or more), the surface of the material can be made hydrophilic by irradiating plasma, irradiating ultraviolet rays (UV), or treating with chemicals. It is also possible to do so. However, when such materials are exposed to the atmosphere, they return to hydrophobicity and remain hydrophilic for a short period of time. Therefore, it is preferable to use an innately hydrophilic material (a material with a contact angle θ of less than 90 degrees) rather than an acquiredly hydrophilic material. In particular, it is preferable to use a superhydrophilic material (a material with a contact angle θ of less than 5 degrees).

The fiber diameter is preferably 5 μm to 30 μm, more preferably 7 μm to 15 μm.

As a specific material (nonwoven fabric) for the filter unit 40, for example, "Bonden" (registered trademark) 260E (product number) manufactured by Kureha Tech Co., Ltd. can be used.

The thickness of the filter unit 40 is preferably 10 mm to 25 mm, more preferably 12 mm to 19 mm. The basis weight of the filter unit 40 is preferably 100g/m ² to 300g/m ² , more preferably 250g/m ² to 300g/m ² . The porosity of the filter unit 40 is preferably 65% or more, more preferably 75% or more. The average size of the holes provided in the filter unit 40 is preferably 0.15 m ² to 0.3 m ² , more preferably 0.2 m ² to 0.25 m ² .

The shape of the filter unit 40 can be, for example, an envelope shape as shown in FIG. The filter unit 40 in FIG. 2 has a bag-like shape in which a sheet of filter material is folded and stacked one on top of the other, with an opening at the top and closed side ends and bottom. Specifically, the side ends of the filter unit 40 are joined by a method such as heat sealing (referred to as end joints 41), and the structure is such that odor gas does not leak out from the joints. The lower part of the filter unit 40 corresponds to a bent portion and is therefore not joined by heat sealing or the like. When manufacturing an envelope-shaped filter unit 40 by overlapping two filter materials instead of using the folded structure as shown in FIG. It is preferable to have a structure in which the parts are joined and odor gas does not leak outside from the joined part.

The filter unit 40 in FIG. 2 is provided with an opening 43 at the top, and this opening 43 has a shape with a taper 44 in which the facing filter materials are gradually spaced apart toward the top. With such a shape, when the odor gas FG is caused to flow from above to below, it becomes easier for the odor gas FG to enter the inside of the bag-shaped filter unit 40. The separation distance N between the filter materials at the upper end of the opening 43 is preferably 100 to 200 mm, more preferably 120 to 170 mm. If the separation distance M is shorter than 100 mm, there is a problem that the odor gas FG is difficult to enter inside the filter unit 40. If the separation distance M is longer than 200 mm, space is taken up, so many filter units 40 may not be arranged in parallel. The problem is that it becomes difficult. Note that partition walls 45 are provided at both ends of the opening 43 in the width direction, and the structure is such that the odor gas FG does not leak out from both ends to the sides.

An upper extending wall 46 extending in the separating direction is provided at the upper end of the opening 43. The separation direction refers to the direction in which the facing filter materials are separated. Providing this upper extending wall 46 has the effect of making it easier to mount the filter unit 40 inside the deodorizing device 4. In the deodorizing device 4 of FIG. 3, a support plate 51 is provided at the top of the deodorizing device 4, and a plurality of gaps extending in the width direction are formed in the support plate 51. Moreover, this support plate 51 extends across the entire interior of the deodorizing device 4 in the horizontal direction. The filter unit 40 is inserted into the gap provided in the support plate 51, and the inserted filter unit 40 is supported by an upper extending wall 46 located above the support plate 51.

A portion of the upper part of the filter unit 40 having a taper 44 (referred to as a taper portion 48) serves as a supply port for the odor gas FG in the filter unit 40, and the wall surface of the portion where the filter material overlaps and is located below the taper portion 48 is the odor gas FG supply port. It becomes a filtering surface 42 that filters the gas FG2.

When the filter unit 40 is shaped as shown in FIG. 2, the density is lower on the upstream side (the upper side of the filter unit 40 in FIG. 2) and the density is lower on the downstream side (the lower side of the filter unit 40 in FIG. 2) with respect to the flow direction of the airflow. It is preferable to provide a density gradient that increases the density on the side). Specifically, it is preferable that the density on the upstream side be about 10 kg/m ³ to 20 kg/m ³ and the density on the downstream side be about 20 kg/m ³ to 40 kg/m ³ . This is because by providing such a density gradient, it is possible to prevent gas passages from becoming narrow due to agglomeration traps and increase ventilation resistance, while at the same time maximizing gas-liquid contact efficiency.

The filter unit 40 can have the performance of filtering 98% of 15 types of powder according to JIS Z 8901, for example. When the odor gas FG2 is passed through this filter unit 40 at a wind speed of 0.15 m/s, the ventilation loss is 500 Pa.

The deodorizing device 4 in FIG. 1 uses four cartridges 47 in which six envelope-shaped filter units 40 shown in FIG. one cartridge.) The surface area of each cartridge 47 can be, for example, about 36 m ² to 45 m ² . The ventilation amount of each cartridge 47 can be set to, for example, 300 m ³ /min to 400 m ³ /min.

The odor gas FG2 supplied from the upper part of the deodorizing device 4 enters the inside of each filter unit 40 and comes into gas-liquid contact with the supply liquid W2 on the filter unit 40. The supply liquid W2 contains an additive AA, ozone, etc. for removing odor components from the odor gas FG2 (both the additive AA and ozone may be included, but from the viewpoint of reducing running costs, (It is preferable to include either one of them), these additives AA and ozone decompose odor components. In addition, countless minute voids (average diameter of about 30 μm to 50 μm) exist in the filtration surface 42 of the filter material of the filter unit 40, and when the filtration surface 42 is wetted with the supply liquid W2, the supply liquid Since W2 fills the voids in the filter material, it becomes difficult for the odor gas FG2 to pass through the filtration surface 42, and as a result, the filtration power of the filtration surface 42 can be increased. That is, the odor components contained in the odor gas FG are mainly captured by the liquid component of the supply liquid W2 adhering to the filtration surface 42, and are decomposed by the additive AA and ozone contained in the supply liquid W2. Further, particulate pollutants (for example, atmospheric dust, combustion fumes) contained in the odor gas FG are captured by the liquid portion of the supply liquid W2 adhering to the filter surface 42, and are also captured by the voids in the filter surface 42. . In this way, in the process of the odor gas FG2 passing through the filtering surface 42 of the filter unit 40 (flowing out from the inside of the filter unit 40), odor components and contaminants in the odor gas FG2 are removed. The gas from which odor components have been removed is exhausted from the exhaust port 6 as deodorized gas DG.

Although the filter unit 40 in FIG. 2 has the opening 40 at the top, it may be turned upside down and the opening 40 at the bottom. Further, the opening 40 may be provided laterally.

The shape of the filter unit 40 may be other than the envelope shape shown in FIG. 2. For example, the outer shape of the filter unit 40 when viewed from the front may be changed to an annular shape or a polygonal shape. Further, although the filter unit 40 in FIG. 2 is formed by bending one sheet of filter material, it may be formed by joining two sheets of filter material at the bottom as described above. Furthermore, the filtration power may be improved by stacking three or more filter materials, although the equipment cost will be high.

(Joint part 50)
The filter unit 40 is provided with a joint portion 50 that joins the opposing filtration surfaces 42 together. When the odor gas FG2 is supplied into the filter unit 40, the odor gas FG2 does not immediately pass through the filter surface 42. This is because, as described above, the size of the voids in the filtering surface 42 is small and the filtering surface 42 is in a wet state, so the resistance when the odor gas FG2 passes through the filtering surface 42 is large. Therefore, the odor gas FG2 supplied to the inside of the filter unit 40 will stay inside the filter unit 40, and the filtration surface of the filter unit 40 will swell (expand) outward.

In the filter units 40 arranged in parallel, if the degree of expansion of the filter units 40 is large (that is, if the length in the alignment direction between the opposing filtration surfaces 42 at the time of expansion is long), the filtration surfaces 42 between adjacent filter units 40 A collision occurs, causing damage to the filter surface 42. If the filtration surfaces 42 of adjacent filter units 40 touch lightly, this will not cause damage, but the odor gas FG2 in the filter unit 40 will not be able to exit to the outside of the filter unit 40 via the contact portion. , the filtration efficiency of the entire filter unit 40 will decrease. Therefore, it is necessary to prevent adjacent filter units 40 from colliding or coming into contact.

Therefore, in the filter unit 40 of the present invention, a joining portion 50 is provided to join the opposing filtration surfaces 42 together. This joining portion 50 can suppress expansion of the filtration surface 42 of the filter unit 40, thereby preventing contact or collision with the filtration surface 42 of an adjacent filter unit 40.

The joint portion 50 is preferably provided at the center of the filter unit 40 in order to enhance the effect of suppressing expansion of the filter unit 40. Alternatively, as shown in FIG. 2, the filters may be provided linearly along the flow direction of the odor gas FG2 supplied into the filter unit 40 (in FIG. 2, the direction from above to below).

When the joint portion 50 is dotted, the joint area of one joint portion 50 is preferably about 100 mm ² to 500 mm ² , more preferably about 100 mm ² to 200 mm ² . If the bonding area is smaller than 100 mm ² , the bonding state will be unstable, and when the odor gas FG2 is blown into the filter unit 40, there is a risk that the bonding between the facing filtration surfaces 42 will peel off. Moreover, if the joint area is larger than 500 mm ² , there is a possibility that the flow of the odor gas FG2 supplied to the inside of the filter unit 40 will be obstructed.

When the joint portion 50 is linear, the line width is preferably about 10 mm to 30 mm, more preferably about 10 mm to 15 mm. If the line width is shorter than 10 mm, the bonding state will be unstable, and when the odor gas FG2 is blown into the filter unit 40, there is a risk that the bonding between the opposing filter surfaces 42 will peel off. Moreover, if the line width is longer than 30 mm, there is a possibility that the flow of the odor gas FG2 supplied to the inside of the filter unit 40 will be obstructed.

The filter unit 40 of FIG. 2 is provided with three linear joints 50 along the flow direction of the odor gas FG2, and these joints 50 form four small spaces Q1 to Q4 in the width direction. is formed. The linear joints 50 may have a linear shape in which they are joined continuously without any break along the flow direction of the odor gas FG2, or may be in a broken line shape in which they are joined at regular intervals. Preferably, a broken line shape is preferred. This is because by forming the shape of a broken line, an effective filtration area can be ensured. In the case of a straight line shape, filtration cannot be performed at the joint 50, so the filtration area becomes smaller than in the case of a broken line shape. It is preferable that the joint portion 42 is not provided on the upper part of the filtering surface 42 so that the odor gas FG2 can freely enter and exit each of the small spaces Q1 to Q4.

In the filter unit 40 of FIG. 2, it is preferable that the widthwise length U of each of the small spaces Q1 to Q4 is 30 mm to 80 mm. If the length U in the width direction is shorter than 30 mm, there is a problem that a sufficient flow path for the odor gas FG2 cannot be secured. If the length U in the width direction is longer than 80 mm, when the filter unit 40 is inflated, it is likely to come into contact with the filter unit 40 adjacent to the filter unit 40 in the row direction. The problem is that it becomes necessary to do so. The length U in the width direction of each of the small spaces Q1 to Q4 may be different lengths, but it is preferable that they be the same length. When the odor gas FG2 flows into the filter unit 40, each of the small spaces Q1 to Q4 expands into a cylindrical shape, so that the length T of each of the small spaces Q1 to Q4 in the direction in which they are lined up becomes the same, and all the small spaces Q1 to Q4 expand into a cylindrical shape. Q4 becomes difficult to contact the adjacent filter unit 40 (FIG. 8(A)). In other words, since the length U in the width direction and the length T in the alignment direction of each of the small spaces Q1 to Q4 are approximately the same length, the length U in the width direction of some small spaces is the width of other small spaces. If the length in the direction is longer than the length U, some small spaces will be adjacent to each other even if other small spaces do not contact the adjacent filter unit 40 (center and right side in the width direction in FIGS. 8(B) and (C)). There is a possibility that it will come into contact with the filter unit 40 (left side in the width direction in FIG. 8(B)(c)). Therefore, by making the widthwise length U of all the small spaces substantially the same, the occurrence of such a problem can be suppressed (FIG. 8(A)). Furthermore, as shown in FIG. 8C, by alternating the positions of the joints 50 in the adjacent filter units 40 (e) and (f), the distance S in the arrangement direction of the adjacent filter units 40 can be shortened. can do. Note that the interval S between adjacent filter units 40 in the arrangement direction can be set arbitrarily, but it is preferably 150 mm to 250 mm, and more preferably 200 mm to 250 mm. When it is shorter than 150 mm, adjacent filter units 40 tend to come into contact with each other, so there is a problem in that the number of joints 50 must be increased to avoid this. When the length is longer than 250 mm, there is a problem that the number of filter units 40 installed inside the container 22 decreases, and the deodorizing ability decreases.

As described above, when the filter units 40 are expanded, it is preferable that the lengths of the filter units 40 in the alignment direction T are made equal. Therefore, it is preferable that the joint portions 50 are provided at even positions on the filter unit 40 . For example, when providing one dot-shaped joint 50, it is preferable to provide it at the center in the height and width directions (FIG. 7(A)), and when providing two or more, it is preferable to provide it at the center in the height and width directions. It is preferable to provide them at positions where the lengths U are equal (FIG. 7(B)). When determining the position of the joint portion 50, it is preferable to use a design line 51 as shown in FIGS. 7(A) and 7(B) to find an even position. FIG. 7C shows an example in which the opening 43 is provided below and the joint portion 50 is provided linearly.

Note that the gas-liquid contact filter 8 has not only air permeability but also water permeability. Therefore, the supply liquid W2 sprayed from the upper part to the lower gas-liquid contact filter 8 is temporarily held in the filter material of the gas-liquid contact filter 8, but as time passes, It moves to the outer surface side and then falls by gravity from the gas-liquid contact filter 8.

(Storage section 25)
A storage section 25 that stores the storage liquid W3 is provided at the lower part of the deodorizing device 4. The supply liquid W2 that has fallen from the gas-liquid contact filter 8 is stored in this storage section 25 as a stored liquid W3.

Preferably, the storage section 25 is provided with a level sensor 9 that measures the level of the storage liquid W3. The level sensor 9 detects whether the amount of the stored liquid W3 stored in the storage part 25 has fallen below a predetermined level, and when it has fallen below the specified level, it is determined that stable supply of the supply liquid W2 has become difficult. It is preferable to use a system that issues an alarm to notify the user. Moreover, it is preferable that the amount of the stored liquid W3 stored in the storage part 25 be about 10 times the amount of liquid being circulated.

The deodorizing device 4 shown in FIG. 1 uses the pump 17 to extract a part of the stored liquid W3 stored in the storage part 25 and returns it to the spray nozzle 7, but the stored liquid W3 contains impurities derived from the odor gas FG2 ( For example, combustion soot, atmospheric dust, etc.) may be mixed in, and this impurity may clog the spray nozzle 7 and the gas-liquid contact filter 8. Therefore, it is preferable to provide a liquid filtration filter 18 in the return path RL of the stored liquid W3 to remove these impurities.

Alternatively, a water tank 20 may be connected to the return path RL, and a mixed liquid W4 containing the raw water W1 and the additive AA may be inserted into the returned liquid W3, and this may be used as the supply liquid W2. The amount of the mixed liquid W4 inserted is adjusted by the opening degree of the control valve 21.

(Suction fan 11)
In the deodorizing equipment 1 shown in FIG. 1, a suction fan 11 is provided downstream of the exhaust port 6 of the deodorizing device 4 (which may be installed near the exhaust port 6). Due to the suction force of the suction fan 11, the odor gas FG2 passes through the gas-liquid contact filter 8 and becomes deodorized gas DG from which odor components have been removed, and then is exhausted from the exhaust port 6 and dissipated into the atmosphere. be done. Instead of the suction fan 11 or together with the suction fan 11, a blower fan (not shown) is provided near the air supply port 5 of the deodorizing device 4 (or upstream of the air supply port 5). It may be configured such that FG2 is blown into the deodorizing device 4, and the deodorizing gas DG from which odor components have been removed is exhausted from the exhaust port 6 and diffused into the atmosphere.

(densitometer 15)
After the odorous gas FG2 passes through the gas-liquid contact filter 8, a part of the deodorized gas DG is extracted at some point before being dissipated into the atmosphere as the deodorized gas DG, and the odorous components contained in the deodorized gas DG are extracted. It is preferable to measure the amount with the densitometer 15. Then, it is preferable to change the operating amount of the pump 17 based on the measurement result of the concentration meter 15, and change the amount of the supply liquid W2 sprayed from the spray nozzle 7. Specifically, when the amount of odor components in the deodorizing gas DG is higher than a predetermined value (for example, odor intensity 2.5) , the amount of spraying of the supply liquid W2 is increased, and the amount of odor components is also increased to the predetermined value. If it is lower than , it is preferable to perform control to reduce the spray amount of the supply liquid W2.

Further, it is preferable that an underwater ozone concentration meter (not shown) for measuring the ozone concentration in the stored liquid W3 is attached to the storage part 25 of the deodorizing device 4 to maintain a constant ozone concentration in the stored liquid W3 to be returned. . Specifically, the ozone concentration of the stored liquid W3 is preferably 4 ppm to 20 ppm, more preferably 4 ppm to 10 ppm. If the ozone concentration of the stored liquid W3 is lower than 4 ppm, there is a problem that when the stored liquid W3 is returned and injected from the spray nozzle 7, the deodorizing effect of deodorizing the odor gas FG2 is low. Further, when the ozone concentration of the stored liquid W3 is higher than 20 ppm, there is a problem that the ozone concentration in the gas in the container 22 increases by injecting the stored liquid W3 with a high ozone concentration from the spray nozzle 7. Further, if the ozone concentration of the stored liquid W3 is higher than 20 ppm, there is a problem that an ozone generator with higher performance than necessary must be introduced, which is uneconomical.

According to the deodorizing equipment 1 of the present invention, there are the following advantages compared to the conventional filler shower system.

In the gas-liquid contact filter 8, by providing a density gradient that lowers the density on the upstream side and increases the density on the downstream side with respect to the flow direction of the airflow, short passes and channeling are eliminated, and the surface area of the filter material is increased. As a result, the gas-liquid contact efficiency can be increased and the deodorizing effect can be enhanced.

By using polyester fiber as the material of the gas-liquid contact filter 8, the pressure loss when the odor gas FG2 passes through the gas-liquid contact filter 8 is reduced. Therefore, the driving power of the suction fan 11 can be reduced. Furthermore, pressure loss can be suppressed by reducing the surface wind velocity to 1/15 or less compared to the conventional packed bed method.

As described above, since the gas-liquid contact filter 8 has a high gas-liquid contact efficiency, the amount of spraying of the supply liquid W2 can be reduced. As a result, the power of the pump 17 can be reduced.

Furthermore, by increasing the specific surface area of the filter material, the amount of supplied liquid retained by the gas-liquid contact filter 8 increases. Therefore, the amount of spraying of the supply liquid W2 can be reduced, and the power of the pump 17 can be reduced.

The gas-liquid contact filter 8 is of an envelope type, and the envelope-shaped gas-liquid contact filters 8 are arranged in parallel and bundled to form a cartridge type. Since such an envelope-shaped gas-liquid contact filter 8 has a large surface area, the size and capacity of the deodorizing device 4 can be significantly reduced compared to a conventional filler-type deodorizing device. Furthermore, if you want to increase the amount of deodorizing treatment, you can simply increase the number of cartridges installed, so you can easily increase the amount of deodorizing treatment.

Due to the wettability of the filter material of the gas-liquid contact filter 8, it is possible to hold a constant amount of the supply liquid W2. Efficiency can be kept constant and deodorizing performance becomes stable.

When the particle diameter (Ferret diameter) of the supply liquid W2 sprayed from the spray nozzle 7 is about 0.1 mm to 0.7 mm, the mist of the supply liquid W2 hardly spreads. Since the supply liquid W2 injected from the injection port has good diffusivity, it can be uniformly sprayed onto the gas-liquid contact filter 8, and has the advantage that spots are less likely to occur. By uniformly distributing the supply liquid W2 onto the gas-liquid contact filter 8, uniform gas-liquid contact can be achieved.

When the mist of the supply liquid W2 is almost completely dissipated, the amount of the supply liquid W2 that evaporates and disappears without reaching the gas-liquid contact filter 8 decreases. power can be reduced. In addition, in this deodorizing equipment 1, since the odor gas FG is humidified in advance by the humidifier 2, the amount of supply liquid W2 required at the time of gas-liquid contact is small. Therefore, even if this point is considered, the amount of spraying of the supply liquid W2 can be reduced.

If ozone is mixed into the supply liquid W2 instead of the additive AA, the running cost can be significantly reduced because the additive AA becomes unnecessary. From the viewpoint of saving transportation costs, etc., it is preferable to provide an ozone generator 14 at the site and generate ozone at the site to be mixed into the supply liquid W2. Ozone generated by the ozone generator 14 can be mixed into the stored liquid W3 (which may be directly mixed into the supplied liquid W2) by a microbubble method or the like.

1: Deodorizing equipment, 2: Humidifying device, 3: Spray pipe, 4: Deodorizing device, 5: Air supply port, 6: Exhaust port, 7: Spray nozzle, 8: Gas-liquid contact filter, 9: Level sensor, 11: Fan, 12: Microbubble nozzle, 13: Control valve, 14: Ozone generator, 15: Concentration meter, 16: Control device, 17: Pump, 18: Liquid filtration filter, 19: Additive tank, 20: Water tank, 21: Control valve, 22: Container, 23: Air supply port, 24: Exhaust port, 25: Storage section, 40: Filter unit, 41: End joint section, 42: Filtration surface, 43: Opening section, 44: Taper , 45: partition wall, 46: upper extension wall, 47: cartridge, 48: tapered part, 50: joint part, 51: support plate, A: atmosphere, DG: deodorizing gas, FG: odor gas, FG1: before humidification odor gas, AA: additive, FG2: odor gas after humidification, M: mist, N: opening width of opening, Q1 to Q4: small space, W: liquid, W1: raw water, W2: supply liquid, W3 :Reserved liquid, W4: Mixed liquid

Claims (7)

A gas-liquid contact filter in which a plurality of bag-shaped filter units that remove odor components from odor gas through gas-liquid contact are arranged in parallel;
a spray nozzle that is provided above the gas-liquid contact filter and sprays a supply liquid from above the gas-liquid contact filter to wet the gas-liquid contact filter;
a storage section that is provided below the gas-liquid contact filter and stores the supply liquid that has fallen downward after passing through the gas-liquid contact filter as a storage liquid;
The filter unit includes:
An opening that is a supply port for odor gas at the top,
a filtration surface for filtering the odor gas, provided below the opening, on which flat filter materials are overlapped, and both ends and lower portions of the filter materials are closed;
The odor gas is supplied from the openings of the plurality of filter units, flows from the top to the bottom inside the portion where the filter materials of the filter units overlap, and expands the portion where the filter materials of each filter unit overlap. and flows out to the outside through the filtration surface of the expanded filter unit from the inside to the outside,
The filter unit is provided with a joint portion that joins opposing filtration surfaces,
The connecting portion suppresses expansion of the filter unit, thereby suppressing contact between the expanded filtration surface of the filter unit and the adjacent expanded filtration surface of the filter unit,
A deodorizing device characterized by: 2. The deodorizing device according to claim 1, wherein the opening is formed by flat filter materials stacked one on top of the other on the filtration surface and gradually spaced apart toward the top. The joint portion is provided linearly from above to below the filter unit,
A plurality of small spaces adjacent to each other in the width direction are formed in the filtering surface by the linear joint,
The deodorizing device according to claim 1 or 2, wherein each of the small spaces expands into a cylindrical shape due to the odor gas flowing into the filter unit. 2. The deodorizing device according to claim 1, wherein the gas-liquid contact filter has a density gradient in the height direction such that the density on the lower side is higher than the density on the upper side. 2. The deodorizing device according to claim 1, wherein at least one selected from the group consisting of ozone, an acid/alkali neutralizer, and an oxidizing agent is added to the supply liquid sprayed from the spray nozzle. A deodorizing equipment comprising the deodorizing device according to claim 1,
The deodorizing equipment has a humidifying device upstream of the deodorizing device,
The humidifying device is provided with a spray pipe equipped with a nozzle on a path from the air supply port to the exhaust port for the odor gas, and mist is sprayed from the nozzle of the spray pipe to the air supply port side and the exhaust port side, respectively. The configuration is
The odor gas, which has been humidified to a humidity of 90% or more by the humidifying device, is supplied to the deodorizing device.
Deodorizing equipment characterized by: In the plurality of filter units,
The joint portions provided in any filter unit and the joint portions provided in filter units adjacent to the filter unit are provided at alternate positions in the width direction,
The deodorizing device according to claim 1.

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