CN105240093B - A kind of diesel engine exhaust gas purification device - Google Patents
A kind of diesel engine exhaust gas purification device Download PDFInfo
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- CN105240093B CN105240093B CN201510641554.4A CN201510641554A CN105240093B CN 105240093 B CN105240093 B CN 105240093B CN 201510641554 A CN201510641554 A CN 201510641554A CN 105240093 B CN105240093 B CN 105240093B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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Abstract
The invention discloses a kind of diesel engine exhaust gas purification device, including gaseous ammonia generation system, preprocessing system and the catalytic reduction reaction system being sequentially connected；The front end of gaseous ammonia generation system is connected with exhaust emissions of diesel engine mouth, and gaseous ammonia is generated system and is sprayed into urea liquid using air-flowing type shower nozzle imperceptible vaporific, and gaseous ammonia is produced in the presence of high-temperature tail gas；The preprocessing system is used to retain solid impurity and the not most oil droplet that burns in diesel engine vent gas；The solid impurity includes particulate solid and/or class bituminous material；Tail gas after preprocessing system processing is reacted in the catalytic reduction reaction system with the gaseous ammonia, the gas after being purified.The present invention can solve the problem that existing exhaust gas processing device is insurmountable because the not most heavy oil microlayer model of burning, carbonization, vulcanized particles thing are after even the high class bituminous material of viscosity enters porous ceramics catalyst unit, caused by the failure of porous ceramics catalyst unit the problem of.
Description
Technical field
The present invention relates to environmental technology field, more particularly to a kind of diesel engine exhaust gas purification device.
Background technology
Include gaseous state and the pollutant of solid-state in the waste gas of the exhaust emissions of diesel engine, be mainly in gaseous contaminant
NOX、SO2, CO, HC and sulfur-containing mixture etc.；Solid contaminant is most importantly carbonized particles thing.In the prior art, in purification
The method of gaseous contaminant is stated mainly using the NO in selective catalytic reduction purification gaseous contaminantXAnd CO；Using this
During method, reactant is gaseous ammonia NH3, generally obtaining the method for gaseous ammonia is：By air-stream spraying or high-pressure fog by urea-
The aqueous solution is changed into microlayer model state and is sufficiently mixed with high-temperature tail gas, the urine in urea-water solution in the presence of high-temperature tail gas
Element is heated to more than 160 DEG C rapidly and decomposed, and produces ammonia NH3With biuret CONH, wherein ammonia NH3In a part of conduct
Remove SO2Reactant, another part and tail gas are mixed into porous ceramics catalyst unit, it is alternatively that property catalytic reduction method
Reactant, the nitrogen oxides in tail gas is removed in the environment of the high mild catalytic.
But this method is applied can produce many problems in marine diesel exhaust gas cleaner.Produce these problems
The reason for be because the fuel of diesel engine for ship is that ordinary diesel oil or fuel oil, especially some seagoing vessels use cut
Fuel oil or residual fuel oil, most heavy part after crude distillation is belonged to, the sulfur content of these oil products is about automobile-used bavin
The hundred times of oil, wherein other impurity are also more much higher than derv fuel.This has been resulted in marine diesel oil tail gas not only
Above-mentioned gaseous state and solid contaminant be present, but also contain the not most heavy oil microlayer model of substantial amounts of burning, carbonization, vulcanized particles
The thing even high class bituminous material of also many viscosity, these materials can sink quickly after porous ceramics catalyst unit is entered
Product forms the separation layer of extremely difficult cleaning, causes urging on the inwall of ceramic catalytic device on the inwall of porous ceramics catalyst unit
Agent is isolated with tail gas, porous ceramics catalyst unit is lost catalytic action, makes porous ceramics catalyst unit permanent failure.One
As porous ceramics catalyst unit on diesel engine for automobile exhaust gas purification equipment life-span in or so 15000-20000 hours, and
On marine diesel exhaust gas purification equipment, about 100-200 hour of usage time will be more caused by deposition forms separation layer
Hole ceramic catalytic unit thoroughly scrap by failure.
The content of the invention
(1) technical problems to be solved
The technical problem to be solved in the present invention is：It is insurmountable because burning not how existing exhaust gas processing device is solved
After most heavy oil microlayer model, carbonization, vulcanized particles thing or even the high class bituminous material of viscosity enters porous ceramics catalyst unit,
Caused by porous ceramics catalyst unit failure the problem of.
(2) technical scheme
In order to solve the above-mentioned technical problem, the present invention provides a kind of diesel engine exhaust gas purification device, including be sequentially connected
Gaseous ammonia generation system, preprocessing system and catalytic reduction reaction system；
The front end of the gaseous ammonia generation system is connected with exhaust emissions of diesel engine mouth, and the gaseous ammonia generation system uses
Urea liquid is sprayed into imperceptible vaporific by air-flowing type shower nozzle, and gaseous ammonia is produced in the presence of high-temperature tail gas；
The front end of the preprocessing system is connected with the rear end of gaseous ammonia generation system, after the preprocessing system
End is connected with the front end of the catalytic reduction reaction system, and the preprocessing system is used to retain solid impurity in diesel engine vent gas
With the not most oil droplet that burns；The solid impurity includes particulate solid and/or class bituminous material；
Multiple porous ceramics catalyst units, the porous ceramics catalyst unit are provided with the catalytic reduction reaction system
Inwall on coat reduction reaction needed for catalyst, by the preprocessing system processing after tail gas it is described catalysis reduction
Reacted in reaction system with the gaseous ammonia, the gas after being purified.Preferably, the diesel engine exhaust gas purification device
Also include tail gas inlet pipe, import reducer pipe, the first housing, outlet reducer pipe and the cleaning of off-gas outlet pipe for being sequentially connected with and penetrating；
The tail gas inlet pipe is connected with exhaust emissions of diesel engine mouth；
The gaseous ammonia generation system is arranged in the import reducer pipe；
The preprocessing system is arranged on the first housing cavity front portion, and the catalytic reduction reaction system is arranged on institute
State the first housing cavity rear portion.
Preferably, the preprocessing system and the catalytic reduction reaction system are described to state pre-treatment at a distance of pre-determined distance
Plenum chamber is formed between system and the catalytic reduction reaction system.
Preferably, the side of the plenum chamber is provided with maintenance door.
Preferably, the preprocessing system includes：Pre-treatment framework, front apron, rare earth containing zeolite module, rear plate washer and angle
Steel guide rail；
The pre-treatment framework includes multiple spaces setting up and down, setting on the rectangular steel pipe of each space bottom a plurality of
Angle guide, the size of spacing and the rare earth containing zeolite module between the angle guide are adapted；The front apron and
The rear baffle is alternately set up and down, to block the horizontal space of the pre-treatment framework so that diesel engine vent gas is described
The rare earth containing zeolite module that can only be detoured during pre-treatment frame flow front and rear can pass through；
Wherein, the rare earth containing zeolite module includes the second housing and rare earth containing zeolite particle, the rare earth containing zeolite
Grain second is stated in housing loaded on institute, and the rare earth containing zeolite particle is used to retain the not most oil droplet and solid of being burnt in diesel engine vent gas
Body impurity.
Preferably, second housing by expanded steel diamond mesh and module groove profile frame set into；
The module groove profile framework is groove profile four directions framework, on the inside of the module groove profile framework both sides respectively with the rhombus
Expanded metal lath is welded to connect, and forms the second hollow housing.
Preferably, the rare earth containing zeolite particle is by rare earth chloride, boiling mineral powder, bentonite, cement and land plaster system
Into particle.
Preferably, the diesel engine exhaust gas purification device also includes：Intelligent observing and controlling system；
The intelligent observing and controlling system include temperature sensor, liquid level sensor, NOx sensor, audible-visual annunciator and
Touch-screen microprocessor；The temperature sensor, the temperature of the tail gas for gathering the exhaust emissions of diesel engine mouth；
The NOx sensor, for gathering the amount of nitrogen oxides in the cleaning of off-gas outlet pipe exit；
The liquid level sensor, for gathering the urine for being used to hold urea-water solution in the gaseous ammonia generation system
The liquid level of aqueous solution of urea in plain tank；
The touch-screen microprocessor, the temperature signal for being obtained according to the temperature sensor control the gaseous ammonia
Generation system starts or is stopped；
The touch-screen microprocessor, it is additionally operable to the amount of nitrogen oxides signal obtained according to the NOx sensor
Control gaseous ammonia generation system generation gaseous state ammonia amount number；
The touch-screen microprocessor, the liquid level signal for being additionally operable to be obtained according to the liquid level sensor control the acousto-optic
Whether alarm alarms.
Preferably, the gaseous ammonia generation system includes air-flowing type shower nozzle, and distinguishes phase with the interface of air-flowing type shower nozzle
Gas circuit feeding unit and fluid path feeding unit even；
The gas circuit feeding unit, including compressed air source, compressed air pressure-reducing valve, the shower nozzle air supply pipe being sequentially connected；
The shower nozzle air supply pipe is connected with the air-flowing type shower nozzle；
The liquid supplying unit, including be sequentially connected urea tank, urea feed pipe before pump, frequency conversion Machinery Diaphragm Pump,
Urea feed pipe diaphragm accumulator and shower nozzle feed pipe after pump；
Wherein, the diaphragm accumulator is in after the pump between urea feed pipe and the shower nozzle feed pipe, is used for
The pulsation urea solution stream sent from the frequency conversion Machinery Diaphragm Pump is become into continuous urea liquid stream；
The shower nozzle feed pipe is connected with the air-flowing type shower nozzle；
The urea liquid stream that the high speed compression air-flow that the gas circuit feeding unit provides provides with the fluid path feeding unit exists
Mixed in the air-flowing type shower nozzle so that urea solution stream forms mist state urea droplets.
Preferably, the catalytic reduction reaction system also includes cross partition and shatter-proof glass fibrofelt；
The porous ceramics catalyst unit is arranged in the multiple coffins formed by the cross partition, Mei Gesuo
State porous ceramics catalyst unit surrounding to wrap up in the shatter-proof glass fibrofelt, prevent the porous ceramics catalyst unit from shaking
In the case of be damaged.
(3) beneficial effect
Diesel engine exhaust gas purification device provided by the invention, it is not most to being burnt in diesel engine vent gas using preprocessing system
Heavy oil microlayer model, carbonization, the vulcanized particles thing even high class bituminous material of viscosity are retained so that diesel engine vent gas passes through
After pretreating device, formed and there was only NOX、SO2, the gas pollutant such as CO, HC tail gas and gaseous ammonia generation system caused by gaseous state
Ammonia enters catalytic reduction reaction system jointly, and catalytic reduction reaction system is to the NO in tail gasXPurified with CO, due to the tail
Gas is no longer containing heavy oil microlayer model, carbonization, the vulcanized particles thing even high class bituminous material of viscosity, therefore the tail gas will not block up
Catalytic reduction reaction system is filled in, thus substantially increases the use effect of the catalytic reduction reaction system of diesel engine exhaust gas purification device
Fruit and service life.
Exhaust gas cleaner provided by the invention, solve because of not most heavy oil microlayer model, carbonization, the vulcanized particles thing of burning
Even the high class bituminous material of also many viscosity causes porous ceramics catalyst unit after entering porous ceramics catalyst unit
Service life is greatly reduced and short-duration failure is scrapped the problem of.
Brief description of the drawings
Fig. 1 is the structural representation of diesel engine exhaust gas purification device provided in an embodiment of the present invention；
Fig. 2 is the structural representation for the diesel engine exhaust gas purification device that another embodiment of the present invention provides；
Fig. 3 is the A-A profiles in Fig. 2；
Fig. 4 is the B-B profiles in Fig. 2；
Fig. 5 is the C-C profiles in Fig. 2；
Fig. 6 is the schematic perspective view of porous ceramics catalyst unit；
Fig. 7 is the structural representation for the rare earth containing zeolite module that other embodiments of the invention provide；
Fig. 8 is the D-D profiles in Fig. 7；
Fig. 9 is the structural representation for the diesel engine exhaust gas purification device that other embodiments of the invention provide；
Figure 10 and Figure 11 is the operation principle schematic diagram for the intelligent observing and controlling system that other embodiments of the invention provide；
Wherein：1：Supporting leg；2：First housing；3：Pre-treatment framework；4：Front apron；5：Rare earth containing zeolite module；6：Air-flow
Formula shower nozzle；7：Shower nozzle feed pipe；8：Shower nozzle air supply pipe；9：Tail gas inlet pipe；10：Temperature sensor；11：Temperature sensor signal
Line；12：Import fastening bolt group；13：Import reducer pipe；14：Compressed air pressure-reducing valve；15：Diaphragm accumulator；16：After pump
Urea feed pipe；17：Frequency conversion Machinery Diaphragm Pump；18：Liquid level sensor signal wire；19：Liquid level sensor；20：Urea-water-soluble
Liquid；21：Urea tank；22：Urea feed pipe before pump；23：Switch board；24：Touch-screen microprocessor；25：NOx sensor
Signal wire；26：Rear baffle；27：Maintenance door；28：Ceramic catalytic unit；29：Shatter-proof glass fibrofelt；30：Export reducer pipe；
31：Export fastening bolt group；32：Cleaning of off-gas outlet pipe；33：NOx sensor；34：Angle guide；35：Housing outside plate；
36：Heat preservation fibre glass cotton block；37：Housing inner panel；38：Case frame；39：Cross partition；40：Rare earth containing zeolite particle；
41：Expanded steel diamond mesh；42：Module groove profile framework；43：Audible-visual annunciator signal wire；44：Audible-visual annunciator；45：Frequency converter inputs
Signal wire；46：Frequency converter；47：Frequency converter output line；48：Power line.
Embodiment
With reference to the accompanying drawings and examples, the embodiment of the present invention is described in further detail.Implement below
Example is used to illustrate the present invention, but is not limited to the scope of the present invention.
Diesel engine exhaust gas purification device provided by the invention can apply using ordinary diesel oil, fuel oil or other containing miscellaneous
On tail gas clean-up of the more diesel oil of matter as the vehicles of fuel, for example, can apply using distillate fuel oil or
On the seagoing vessel of residual fuel oil.
The embodiments of the invention provide a kind of diesel engine exhaust gas purification device, referring to Fig. 1, including the gaseous ammonia being sequentially connected
Generation system 100, preprocessing system 200 and catalytic reduction reaction system 300；
The front end of the gaseous ammonia generation system 100 is connected with exhaust emissions of diesel engine mouth, and the gaseous ammonia generates system
100 are sprayed into urea liquid imperceptible vaporific using air-flowing type shower nozzles, and gaseous ammonia is produced in the presence of high-temperature tail gas；
The front end of the preprocessing system 200 is connected with the rear end of gaseous ammonia generation system 100, the pre-treatment system
The rear end of system 200 is connected with the front end of the catalytic reduction reaction system 300, and the preprocessing system 200 is used to retain diesel oil
Solid impurity and the not most oil droplet that burns in tail gas；The solid impurity includes particulate solid and/or class bituminous material；
Multiple porous ceramics catalyst units, the porous ceramics catalysis are provided with the catalytic reduction reaction system 300
The catalyst needed for reduction reaction is coated on the inwall of unit, the tail gas after the preprocessing system 200 processing is described
Reacted in catalytic reduction reaction system 300 with the gaseous ammonia, the gas after being purified.
Diesel engine exhaust gas purification device described in the present embodiment, using preprocessing system to being burnt in diesel engine vent gas not to the greatest extent
Heavy oil microlayer model, carbonization, vulcanized particles thing even the high class bituminous material of viscosity retained so that diesel engine vent gas leads to
After crossing pretreating device, formed and there was only NOX、SO2, the gas pollutant such as CO, HC tail gas and gaseous ammonia generation system caused by gas
State ammonia enters catalytic reduction reaction system jointly, and catalytic reduction reaction system is to the NO in tail gasXPurified with CO, due to this
Tail gas is no longer containing heavy oil microlayer model, carbonization, the vulcanized particles thing even high class bituminous material of viscosity, therefore the tail gas will not
Catalytic reduction reaction system is blocked, thus substantially increases the use of the catalytic reduction reaction system of diesel engine exhaust gas purification device
Effect and service life.
The exhaust gas cleaner that the present embodiment provides, solve because of not most heavy oil microlayer model, carbonization, the vulcanized particles of burning
Thing even causes porous ceramics catalyst unit after the high class bituminous material of also many viscosity enters porous ceramics catalyst unit
Service life be greatly reduced and short-duration failure is scrapped the problem of.
On the basis of above-described embodiment, referring to Fig. 2, it is net that another embodiment of the present invention provides a kind of diesel engine vent gas
Makeup is put, in addition to tail gas inlet pipe 9, import reducer pipe 13, the first housing 2, the outlet and of reducer pipe 30 for being sequentially connected with and penetrating
Cleaning of off-gas outlet pipe 32；
The tail gas inlet pipe 9 is connected with exhaust emissions of diesel engine mouth；
Wherein, the gaseous ammonia generation system 100 is arranged in the import reducer pipe 13；
The preprocessing system 200 is arranged on the inner chamber of the first housing 2 front portion, the catalytic reduction reaction system 300
It is arranged on the inner chamber rear portion of the first housing 2.
Wherein, the exhaust gas cleaner shown in Fig. 2 is that maximum speed is diesel engine maximum (top) speed 900rpm, peak power
The exhaust gas cleaner of 3000kW low-speed marine diesel engine, its basic appearance and size are：Length × width × height=4000mm ×
2200mm × 2200mm, the structure of the device is as shown in Fig. 2 wherein Fig. 3 is the A-A profiles in Fig. 2；Fig. 4 is the B- in Fig. 2
B profiles；Fig. 5 is the C-C profiles in Fig. 2.The implication of each reference is as follows in Fig. 2-Fig. 5：1：Supporting leg；2：First shell
Body；3：Pre-treatment framework；4：Front apron；5：Rare earth containing zeolite module；6：Air-flowing type shower nozzle；7：Shower nozzle feed pipe；8：Shower nozzle supplies
Tracheae；9：Tail gas inlet pipe；10：Temperature sensor；11：Temperature sensor signal line；12：Import fastening bolt group；13：Import becomes
Manage in footpath；14：Compressed air pressure-reducing valve；15：Diaphragm accumulator；16：Urea feed pipe after pump；17：Frequency conversion Machinery Diaphragm Pump；
18：Liquid level sensor signal wire；19：Liquid level sensor；20：Urea-water solution；21：Urea tank；22：Urea feed pipe before pump；
23：Switch board；24：Touch-screen microprocessor；25：NOx sensor signals line；26：Rear baffle；27：Maintenance door；28：It is more
Hole ceramic catalytic unit；29：Shatter-proof glass fibrofelt；30：Export reducer pipe；31：Export fastening bolt group；32：Cleaning of off-gas
Outlet pipe；33：NOx sensor；34：Angle guide；35：Housing outside plate；36：Heat preservation fibre glass cotton block；37：In housing
Plate；38：Case frame；39：Cross partition；40：Rare earth containing zeolite particle；41：Expanded steel diamond mesh；42：Module groove profile framework；
43：Audible-visual annunciator signal wire；44：Audible-visual annunciator；45：Inverter input signal line；46：Frequency converter；47：Frequency converter exports
Line；48：Power line.
In order to increase the space inside the first housing 2, it is preferable that first housing 2 is rectangle.
In order to ensure tail gas Uniform Flow, make the preprocessing system 200 and the catalytic reduction reaction system 300 apart
Pre-determined distance, it is described to state shape between preprocessing system 200 and the catalytic reduction reaction system 300 in first housing 2
Into plenum chamber.
As seen from the above description, the diesel engine exhaust gas purification device described in the present embodiment, including be sequentially connected with and penetrate
Tail gas inlet pipe 9, import reducer pipe 13, the first housing 2 and outlet reducer pipe 30 and cleaning of off-gas outlet pipe 32.The tail gas inlet pipe 9
For pipeline made of stainless steel, one end is connected with diesel engine vent gas row's mouth, and the other end is connected with import reducer pipe 13.Import becomes
Footpath pipe 13 is tapered pipeline made of stainless steel, and interior setting gaseous ammonia generates system 100, while its other end and the first housing 2
It is connected by import fastening bolt group 12.
Preferably, first housing 2 is the rectangular channel of a front and rear insertion, and its front end passes through import fastening bolt group 12
It is connected with import reducer pipe 13, its rear end is connected by exporting fastening bolt group 31 with outlet reducer pipe 30；Outside its surrounding
The case frame 38 that parietal layer is welded by stainless steel rectangular steel pipe, the full housing made of 304 stainless steel plates is applied in case frame 38
Inner panel 37, the full housing outside plate 35 made of cold-rolled steel sheet of framework external application, is filled up between housing inner panel 37 and housing outside plate 35
Heat preservation fibre glass cotton block 36；The bottom of first housing 2 supporting leg 1 made of multiple rectangular steel pipes supports.
Wherein, referring to Fig. 2, the gaseous ammonia generation system 100 includes air-flowing type shower nozzle 6, and with air-flowing type shower nozzle 6
The gas circuit feeding unit and fluid path feeding unit that interface is respectively connected with；
The gas circuit feeding unit, including compressed air source, compressed air pressure-reducing valve 14, the shower nozzle air supply pipe being sequentially connected
8；The shower nozzle air supply pipe 8 is connected with the air-flowing type shower nozzle 6；
The liquid supplying unit, including be sequentially connected urea tank 21, urea feed pipe 22, frequency conversion mechanical diaphragm before pump
The diaphragm accumulator 15 of urea feed pipe 16 and shower nozzle feed pipe 7 after pump 17, pump；
Wherein, the diaphragm accumulator 15 is in after the pump between urea feed pipe 16 and the shower nozzle feed pipe 7,
For the pulsation sent from the frequency conversion Machinery Diaphragm Pump 17 urea solution stream to be become into continuous urea liquid stream；
The shower nozzle feed pipe 7 is connected with the air-flowing type shower nozzle 6；
The urea liquid stream that the high speed compression air-flow that the gas circuit feeding unit provides provides with the fluid path feeding unit exists
Mixed in the air-flowing type shower nozzle 6 so that the urea solution stream forms mist state urea droplets.
Wherein, urea (CON2H4)-the aqueous solution 20 is logical from urea tank 21 under the swabbing action of frequency conversion Machinery Diaphragm Pump 17
Cross before pump urea feed pipe 16, diaphragm accumulator 15 and shower nozzle feed flow after urea feed pipe 22, frequency conversion Machinery Diaphragm Pump 17, pump
Pipe 7 enters the inside of air-flowing type shower nozzle 6 with entering by compressed air pressure-reducing valve 14 and shower nozzle air supply pipe 8 inside air-flowing type shower nozzle 6
Compressed air mixing, because there is huge speed difference, swiftly flowing compression between swiftly flowing compressed air and liquid stream
Air can tear the liquid film of urea-water solution 20, so that it becomes microlayer model state and ejecting is sufficiently mixed with high-temperature tail gas,
Urea in urea-water solution 20 in the presence of high-temperature tail gas is heated to rapidly more than 160 DEG C and decomposed, and produces ammonia
(NH3) and biuret (CONH), wherein ammonia (NH3) in a part as removing SO2Reactant, another part as choosing
The reactant of selecting property catalytic reduction method；The effect of diaphragm accumulator 15 is the pulsating liquid for exporting frequency conversion Machinery Diaphragm Pump 17
Stream becomes continuity liquid stream.
Wherein, the catalytic reduction reaction system 300 also includes cross partition 39 and shatter-proof glass fibrofelt 29；
The porous ceramics catalyst unit 28 is arranged on splits the multiple coffins formed by the cross partition 39
Interior, each surrounding of porous ceramics catalyst unit 28 is wrapped up in the shatter-proof glass fibrofelt 29, prevents the porous ceramics
Catalyst unit 28 is damaged in case of shock.
Specifically, the catalytic reduction reaction system 300 is arranged on the inner chamber rear portion of the first housing 2.Wherein, it is described to urge
Changing reduction reaction system 300 includes cross partition 39, shatter-proof glass fibrofelt 29 and multiple porous ceramics catalyst units 28；Ten
Font dividing plate 39 is made up of 304 stainless steel plates, and the rectangle that the inner chamber of the first housing 2 is divided into 100 (10 row * 10 are arranged) equidimensions is empty
Between, a porous ceramics catalyst unit 28 is set in each equidimension space, referring to Fig. 6.Each porous ceramics catalyst unit
28 surroundings are wrapped up in the shockproof felt 29 of glass, prevent porous ceramics catalyst unit 28 to be damaged in case of shock.
Wherein, the porous ceramics catalyst unit 28 is one to open up multiple square ducts and square logical at its along its longitudinal direction
The ceramic catalyst carrier of catalyst is coated on the inwall in road.
Further embodiment of this invention provides a kind of concrete structure of the preprocessing system described in above-described embodiment two.Its
In, the preprocessing system 200 includes：Pre-treatment framework 3, front apron 4, rare earth containing zeolite module 5, rear plate washer 26 and angle steel are led
Rail 34；The pre-treatment framework 3 includes multiple spaces setting up and down, a plurality of angle being set on the rectangular steel pipe of each space bottom
Steel guide rail 34, the size of spacing and the rare earth containing zeolite module 5 between the angle guide 34 are adapted；The He of front apron 4
Rear baffle 26 is that 304 stainless steel plates are made, and front apron 4 and rear baffle are alternately set about 26, to block the pre-treatment
The horizontal space of framework 3 so that diesel engine vent gas can only detour rare earth containing zeolite module when being flowed in the preceding processing framework 3
5 front and rear can pass through, it is ensured that all air-flows are when by preprocessing system 200, it is necessary to pass through the place of rare earth containing zeolite module 5
Reason, can enter next stage.
Wherein, the rare earth containing zeolite module 5 includes the second housing and rare earth containing zeolite particle, the rare earth containing zeolite
Grain second is stated in housing loaded on institute, and the rare earth containing zeolite particle is used to retain the not most oil droplet and solid of being burnt in diesel engine vent gas
Body impurity.
Preferably, second housing by expanded steel diamond mesh with module groove profile frame set into the module groove profile framework is
Groove profile four directions framework, module groove profile framework inner side both sides are welded to connect with the expanded steel diamond mesh, formed hollow respectively
Second housing.
Wherein, rare earth containing zeolite module 5 is the core of preprocessing system 200.Referring to Fig. 7-8, rare earth containing zeolite module 5 is wrapped
Include rare earth containing zeolite particle 40, expanded steel diamond mesh 41, module groove profile framework 42；Wherein, module groove profile framework 42 is groove profile four directions
Framework；The inner side both sides of module flute profile framework 42 are welded to connect with expanded steel diamond mesh 41 respectively, form hollow rare earth containing zeolite mould
The housing of block 5, by the rare earth containing zeolite particle 40 in the housing (i.e. the second housing) of the rare earth containing zeolite module 5.
Wherein, in a preferred embodiment of the invention, at the plenum chamber the first housing side, set one inspection
Door 27 is repaiied, cleaning multiplexing is taken out in use for some time for the rare earth containing zeolite module in preprocessing system, also is available for simultaneously
Replacing of the porous ceramics catalyst unit after service life is reached.
Wherein, above-mentioned rare earth containing zeolite particle 40 is by rare earth chloride, boiling mineral powder, bentonite, cement and land plaster system
Into particle.
Wherein, it is the not most heavy oil microlayer model of the substantial amounts of burning that is carried in diesel engine vent gas, carbonization, vulcanized particles thing, viscous
High class bituminous material is spent into after rare earth containing zeolite module 5, can be flowed between rare earth containing zeolite particle 40, this flowing must
These particles are so caused to slow down with rare earth containing zeolite particles collision, simultaneously as rare earth containing zeolite particle is by being inhaled with strong
The zeolite molecular sieve of attached effect is made, can be by these particle absorptions therebetween, simultaneously because zeolite molecular sieve is compounded with rare earth member
Element, also there is certain catalysis reduction to the nitrogen oxides in tail gas, equivalent to first order SCR.Pass through
After the processing of preprocessing system 200, formed and there was only NOX、SO2, the gas pollutant such as CO, HC tail gas and ammonia enter porous ceramics
Catalyst unit 28, when mixed gas is through coating catalyst square duct on the hole inwall of porous ceramics catalyst unit 28,
Under high temperature and catalytic condition, gaseous ammonia in tail gas gaseous mixture and nitrogen oxides (including NO and NO2) following chemistry occurs instead
Should：
4NH3+4NO+O2=4N2+6H2O；8NH3+6NO2=7N2+12H2O；
Simultaneously under high temperature and catalytic condition, carbon monoxide in tail gas gaseous mixture and nitrogen oxidation (including NO and NO2) hair
Give birth to row chemical reaction：
2CO+2NO+O2=2CO2+N2；4CO+2NO2=4CO2+N22；
By above-mentioned chemical reaction, by the carbon monoxide in diesel engine vent gas and the nitrogen of NO_x formation environmental sound
Gas, carbon dioxide and water.To sum up, purified by above three-level, by the main gaseous contaminant (NO of diesel emissionX、SO2、CO)
And the high class bituminous material of the not most heavy oil microlayer model of burning, carbonization, vulcanized particles thing, viscosity removes.
Further, above-mentioned rare earth containing zeolite particle 40 can be made by following steps, simply should below certainly
A kind of preparation method of rare earth containing zeolite particle 40, however it is not limited to this, it is any made of above-mentioned material only with absorption or
The rare earth containing zeolite particle for retaining burnt in diesel engine vent gas not most oil droplet and solid impurity function belongs to protection of the present invention
Scope.
S1：Prepare particle：It is made diameter 6-8mm's after boiling mineral powder, bentonite, cement and gypsum are mixed with water
Particle；Manufactured particle is calcined and dried in stove：450-500 DEG C is heated to from normal temperature, keeping temperature is 3 small
When, stop heating, come out of the stove when it naturally cools to 250 DEG C.
S2：Particle is immersed in the aqueous solution of rare earth chloride, soaks 2~3 minutes, is air-dried after water outlet.
S3：Particle after being air-dried is put into drying baker, is heated to 150 DEG C, is incubated 1 hour, stops heating, with
Stove is cooled to less than 40 DEG C and come out of the stove.
Rare earth containing zeolite particle 40 in preprocessing system can be not most by substantial amounts of burning in diesel engine vent gas in advance
The high class bituminous material of heavy oil microlayer model, carbonization, vulcanized particles thing, viscosity intercepts, and is formed and there was only NOX、SO2, the gas such as CO, HC
The tail gas of the diesel engine of body pollution thing and ammonia, such mixed gas is after porous ceramics catalyst unit 28 is entered, Neng Gouyou
Effect ground reacts under the catalytic action of porous ceramics catalyst unit 28, makes cleaning of off-gas.So that will not be as existing tail gas
Purifier is the same, due to that can not handle the heavy oil microlayer model, carbonization, vulcanized particles that substantial amounts of burning is not most in diesel engine vent gas
The high class bituminous material of thing, viscosity, and make it that these materials enter porous ceramics catalyst unit 28, then these materials are quickly
It can be deposited on the inwall of porous ceramics catalyst unit 28, form the separation layer of extremely difficult cleaning, cause porous ceramics catalyst unit
Catalyst on 28 inwall is isolated with tail gas so that porous ceramics catalyst unit 28 loses catalytic action, causes porous pottery
The permanent failure of porcelain catalyst unit 28.
The embodiment of the present invention four additionally provides a kind of diesel engine exhaust gas purification device, and referring to Fig. 9, the exhaust gas cleaner removes
Outside gaseous ammonia generation system 100 above, preprocessing system 200 and catalytic reduction reaction system 300, in addition to：
Intelligent observing and controlling system 400；
The intelligent observing and controlling system 400 includes temperature sensor, liquid level sensor, NOx sensor, sound and light alarm
Device and touch-screen microprocessor；
The temperature sensor, the temperature of the tail gas for gathering the exhaust emissions of diesel engine mouth；
The NOx sensor, for gathering the amount of nitrogen oxides in the cleaning of off-gas outlet pipe exit；
The liquid level sensor, for gathering the urine for being used to hold urea-water solution in the gaseous ammonia generation system
The liquid level of aqueous solution of urea in plain tank；
The touch-screen microprocessor, the temperature signal for being obtained according to the temperature sensor control the gaseous ammonia
Generation system starts or is stopped；
The touch-screen microprocessor, it is additionally operable to the amount of nitrogen oxides signal obtained according to the NOx sensor
Control gaseous ammonia generation system generation gaseous state ammonia amount number；
The touch-screen microprocessor, the liquid level signal for being additionally operable to be obtained according to the liquid level sensor control the acousto-optic
Whether alarm alarms.
Wherein, audible-visual annunciator can use an alarm to realize, can also use a voice guard and one
Light crossing-signal is realized.
Wherein, the touch-screen microprocessor can be used with communication, shown, the micro- place of HNI touch-screens of calculating and control
Reason device 24 is realized.Wherein, the operation principle schematic diagram of the intelligent observing and controlling system 400 can be found in shown in Figure 10 and Figure 11.
The intelligent observing and controlling system 400 is by temperature sensor 10, temperature sensor signal line 11, liquid level sensor signal wire
18th, liquid level sensor 19, switch board 23, touch-screen microprocessor 24, NOx sensor signals line 25, nitrogen oxides sensing
Device 33, audible-visual annunciator signal wire 43, audible-visual annunciator 44, inverter input signal line 45, frequency converter 46, frequency converter output line
47th, power line 48 forms.Wherein, touch-screen microprocessor 24, frequency converter 46 are arranged in switch board 23.
The core devices of the intelligent observing and controlling system 400 are the touch-screen microprocessors with communication, display, calculating and control
Device 24, the operation principle of intelligent observing and controlling system 400 are：
When diesel engine exhaust gas purification device entrance tail gas temperature be less than 200 DEG C when, because the low injection of temperature urea without
Method Thermal desorption is into ammonia (NH3) and biuret (CONH), urea can be caused to be crystallized in blast pipe, block ceramic catalytic unit；
Now perceived and by the signal that temperature sensor signal line 11 transmits to touch-screen microprocessor 24 by temperature sensor 10
In CPU, CPU sends instruction and closes down frequency conversion Machinery Diaphragm Pump 17.When the temperature of diesel engine exhaust gas purification device entrance tail gas
During higher than 460 DEG C, urea spirt goes directly to be oxidized to NOx, does not reduce NOx emission not only, increases NOx emission on the contrary, now
The signal for perceiving also by temperature sensor 10 and being transmitted by temperature sensor signal line 11 is into touch-screen microprocessor 24
CPU, CPU send instruction close down frequency conversion Machinery Diaphragm Pump 17 stop to liquid ammonia generation system provide urea-water solution 20 from
And ensure gaseous ammonia generation system 100 and always work in 200 DEG C to 460 DEG C of purification temperature window.
When the NOx sensor 33 in diesel engine exhaust gas purification device exit perceives amount of nitrogen oxides (concentration) height
When the numerical value of setting, the signal transmitted by NOx sensor signals line 25 to the CPU in touch-screen microprocessor 24,
CPU sends instruction, adjusts the frequency of frequency converter 46 by inverter input signal line 45, increases further through frequency converter output signal line 47
Add the rotating speed of frequency conversion Machinery Diaphragm Pump 17, improve the amount for the urea-water solution 20 being input to inside clarifier, to improve purification effect
Rate.Otherwise it is less than when the NOx sensor 33 in diesel engine exhaust gas purification device exit perceives amount of nitrogen oxides (concentration)
During the numerical value of setting, the signal transmitted by NOx sensor signals line 25 to the CPU in touch-screen microprocessor 24,
CPU sends instruction, adjusts the frequency of frequency converter 46 by inverter input signal line 45, is dropped further through frequency converter output signal line 47
The rotating speed of low frequency conversion Machinery Diaphragm Pump 17, the amount for the urea-water solution 20 being input to inside clarifier is reduced, can so be avoided
The escaping of ammonia simultaneously reduces urea-water solution consumption.
When the urea-water solution 20 in the urea tank 21 that diesel engine exhaust gas purification device uses soon is used up, in order to true
Protection diesel oil tail air purifying apparatus normal operation, the liquid level sensor 19 installed in the bottom of urea tank 21 are perceived and passed by liquid level
The signal that sensor signal line 18 transmits sends instruction to the CPU in touch-screen microprocessor 24, CPU, and audible-visual annunciator 44 is sent
Sound and light signal, operator is reminded to add urea-water solution 20, it is ensured that diesel engine exhaust gas purification device normal operation.It is wherein described
Switch board 23 is the utensil for disposing touch-screen microprocessor 24, frequency converter 46；The power line 48 is provided to TT＆C system
Power supply.Pass through above observing and controlling, the overall intelligentized control method of finishing device.
In summary, in exhaust gas cleaner provided by the invention, the gaseous ammonia generation system front end and diesel engine
Exhaust port is connected, and rear end is connected with preprocessing system, and gaseous ammonia generation system is sprayed urea liquid in a manner of air-flowing type
Into imperceptible vaporific, gaseous ammonia is produced in the presence of high-temperature tail gas；The preprocessing system is arranged on gaseous ammonia generation system
Between system and catalytic reduction reaction system, it is made up of a set of rare earth containing zeolite grain bed clarifier (rare earth containing zeolite module), its
By the high class bituminous material of the not most heavy oil microlayer model of substantial amounts of burning in diesel engine vent gas, carbonization, vulcanized particles thing, viscosity
And particulate solid is trapped on rare earth containing zeolite grain bed.After preprocessing system, formed and there was only NOX、SO2, CO, HC etc.
The tail gas of the marine diesel of gas pollutant, into the catalytic reduction reaction system being made up of porous ceramics catalyst unit, only
Change the NO in gaseous contaminantXAnd CO, use porous ceramics catalyst unit in diesel engine vent gas cleaning equipment so as to greatly improve
Service life.
In addition, exhaust gas cleaner of the present invention can also have intelligent control function, the intelligent observing and controlling system
By the data of the temperature sensor mounted in inlet exhaust gas, the start and stop of frequency conversion Machinery Diaphragm Pump are determined, can ensure that gaseous ammonia generates
System always works in 200 DEG C to 460 DEG C of purification temperature window.By exporting NOx sensor mounted in cleaning of off-gas
Data become the frequency of frequency source through operation control, to change the rotating speed of frequency conversion Machinery Diaphragm Pump, so as to accurate control input to gaseous state
Ammonia generates the urea liquid amount of system, it is ensured that device does not only reach the purification efficiency for meeting setting, can avoid the occurrence of the escaping of ammonia again
Phenomenon, so as to avoid the waste of urea liquid, reduce use cost；Being reminded by the liquid level sensor in urea tank is
It is no to fill urea liquid to urea tank, to ensure diesel engine exhaust gas purification device normal operation.
Described above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, some improvement and replacement can also be made, these improve and replaced
Also it should be regarded as protection scope of the present invention.
Claims (9)
1. a kind of diesel engine exhaust gas purification device, it is characterised in that the diesel engine exhaust gas purification device includes what is be sequentially connected
Gaseous ammonia generation system, preprocessing system and catalytic reduction reaction system；
The front end of the gaseous ammonia generation system is connected with exhaust emissions of diesel engine mouth, and the gaseous ammonia generation system uses air-flow
Urea liquid is sprayed into imperceptible vaporific by formula shower nozzle, and gaseous ammonia is produced in the presence of high-temperature tail gas；
The rear end of the front end of the preprocessing system and the gaseous ammonia generation system is connected, the rear end of the preprocessing system with
The front end of the catalytic reduction reaction system is connected, and the preprocessing system is used to retain solid impurity and combustion in diesel engine vent gas
Burn not most oil droplet；The solid impurity includes particulate solid and/or class bituminous material；
Be provided with multiple porous ceramics catalyst units in the catalytic reduction reaction system, the porous ceramics catalyst unit it is interior
The catalyst needed for reduction reaction is coated on wall, the tail gas after preprocessing system processing is in the catalytic reduction reaction
Reacted in system with the gaseous ammonia, the gas after being purified；
Wherein, the preprocessing system includes：Pre-treatment framework, front apron, rare earth containing zeolite module, rear baffle and angle steel are led
Rail；
The pre-treatment framework includes multiple spaces setting up and down, a plurality of angle steel being set on the rectangular steel pipe of each space bottom
Guide rail, the size of spacing and the rare earth containing zeolite module between the angle guide are adapted；The front apron and described
Rear baffle is alternately set up and down, to block the horizontal space of the pre-treatment framework so that diesel engine vent gas is at the preceding place
The rare earth containing zeolite module that can only be detoured when managing frame flow front and rear can pass through；
Wherein, the rare earth containing zeolite module includes the second housing and rare earth containing zeolite particle, the rare earth containing zeolite particle dress
In in the second shell body, the rare earth containing zeolite particle be used to retain burnt in diesel engine vent gas not most oil droplet and solid it is miscellaneous
Matter；
The diesel engine exhaust gas purification device also includes：Intelligent observing and controlling system；
The intelligent observing and controlling system includes temperature sensor and touch-screen microprocessor；
The temperature sensor, the temperature of the tail gas for gathering exhaust emissions of diesel engine mouth；
The touch-screen microprocessor, the temperature signal for being obtained according to the temperature sensor control the gaseous ammonia generation
System starts or is stopped, to ensure that the gaseous ammonia generates the purification temperature window that system always works in 200 DEG C to 460 DEG C
Mouthful.
2. diesel engine exhaust gas purification device as claimed in claim 1, it is characterised in that the diesel engine exhaust gas purification device is also
Including tail gas inlet pipe, import reducer pipe, the first housing, outlet reducer pipe and the cleaning of off-gas outlet pipe for being sequentially connected with and penetrating；
The tail gas inlet pipe is connected with exhaust emissions of diesel engine mouth；
The gaseous ammonia generation system is arranged in the import reducer pipe；
It is anterior that the preprocessing system is arranged on first housing cavity, and the catalytic reduction reaction system is arranged on described the
One housing cavity rear portion.
3. diesel engine exhaust gas purification device as claimed in claim 2, it is characterised in that the preprocessing system and the catalysis
Reduction reaction system forms plenum chamber between pre-determined distance, the preprocessing system and the catalytic reduction reaction system.
4. diesel engine exhaust gas purification device as claimed in claim 3, it is characterised in that the side of the plenum chamber is provided with inspection
Repair door.
5. the diesel engine exhaust gas purification device as described in any one of Claims 1 to 4, it is characterised in that second housing by
Expanded steel diamond mesh and module groove profile frame set into；
The module groove profile framework is groove profile four directions framework, on the inside of the module groove profile framework both sides respectively with the rhombic steel plate
Net is welded to connect, and forms the second hollow housing.
6. the diesel engine exhaust gas purification device as described in any one of Claims 1 to 4, it is characterised in that the rare earth containing zeolite
Particle is the particle made of rare earth chloride, boiling mineral powder, bentonite, cement and land plaster.
7. diesel engine exhaust gas purification device as claimed in claim 2, it is characterised in that the intelligent observing and controlling system also includes liquid
Level sensor, NOx sensor and audible-visual annunciator；
The NOx sensor, for gathering the amount of nitrogen oxides in the cleaning of off-gas outlet pipe exit；
The liquid level sensor, for gathering the urea tank for being used to hold urea-water solution in the gaseous ammonia generation system
In aqueous solution of urea liquid level；
The touch-screen microprocessor, the amount of nitrogen oxides signal for being additionally operable to be obtained according to the NOx sensor control
Gaseous ammonia generation system generation gaseous state ammonia amount number；
The touch-screen microprocessor, the liquid level signal for being additionally operable to be obtained according to the liquid level sensor control the sound and light alarm
Whether device alarms.
8. diesel engine exhaust gas purification device as claimed in claim 2, it is characterised in that the gaseous ammonia generation system includes gas
Streaming shower nozzle, and the gas circuit feeding unit and fluid path feeding unit being respectively connected with the interface of air-flowing type shower nozzle；
The gas circuit feeding unit, including compressed air source, compressed air pressure-reducing valve, the shower nozzle air supply pipe being sequentially connected；It is described
Shower nozzle air supply pipe is connected with the air-flowing type shower nozzle；
The fluid path feeding unit, including be sequentially connected urea tank, before pump after urea feed pipe, frequency conversion Machinery Diaphragm Pump, pump
Urea feed pipe, diaphragm accumulator and shower nozzle feed pipe；
Wherein, the diaphragm accumulator is in after the pump between urea feed pipe and the shower nozzle feed pipe, for will be from
The pulsation urea solution stream that the frequency conversion Machinery Diaphragm Pump is sent becomes continuous urea liquid stream；
The shower nozzle feed pipe is connected with the air-flowing type shower nozzle；
The urea liquid stream that the high speed compression air-flow that the gas circuit feeding unit provides provides with the fluid path feeding unit is described
Mixed in air-flowing type shower nozzle so that urea solution stream forms mist state urea droplets.
9. diesel engine exhaust gas purification device as claimed in claim 1, it is characterised in that the catalytic reduction reaction system is also wrapped
Include cross partition and shatter-proof glass fibrofelt；
The porous ceramics catalyst unit is arranged in the multiple coffins formed by the cross partition, each described more
Hole ceramic catalytic unit surrounding is wrapped up in the shatter-proof glass fibrofelt, prevents the porous ceramics catalyst unit in shock conditions
It is lower impaired.
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| DE102016205274A1 (en) * | 2016-03-31 | 2017-10-05 | Man Diesel & Turbo Se | Exhaust after treatment system and internal combustion engine |
| WO2020083166A1 (en) * | 2018-10-22 | 2020-04-30 | 上海必修福企业管理有限公司 | Engine exhaust ozone purification system and method |
| CN109723525A (en) * | 2019-03-13 | 2019-05-07 | 中国船舶电站设备有限公司 | A kind of SCR urea injection system |
| CN111974217B (en) * | 2020-08-14 | 2022-05-17 | 安徽省英菲尼科技股份有限公司 | Tail gas treatment device of diesel engine generator set |
| CN112922706B (en) * | 2021-04-06 | 2021-09-28 | 宜兴市锦龙陶瓷有限公司 | Honeycomb ceramic sintering device for thin-wall diesel engine tail gas purification and use method thereof |
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| EP2718011A1 (en) * | 2011-06-07 | 2014-04-16 | Umicore AG & Co. KG | Catalytic converter for the selective catalytic reduction of nitrogen oxides in the exhaust gas of diesel engines |
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