CN102935331A - Apparatus for reducing nitrogen oxides in exhaust gas - Google Patents
Apparatus for reducing nitrogen oxides in exhaust gas Download PDFInfo
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- CN102935331A CN102935331A CN2011102326948A CN201110232694A CN102935331A CN 102935331 A CN102935331 A CN 102935331A CN 2011102326948 A CN2011102326948 A CN 2011102326948A CN 201110232694 A CN201110232694 A CN 201110232694A CN 102935331 A CN102935331 A CN 102935331A
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- filter core
- additive
- described filter
- polymeric material
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Abstract
The invention relates to an apparatus for treatment of exhaust gas generated by an internal combustion engine. The apparatus includes an exhaust gas pipeline (3), and an additive supply line (4) is introduced into the pipeline (3). The additive makes nitrogen oxides contained in the exhaust gas undergo a reduction reaction. The apparatus also includes a filter core (65) for filtering the additive. The filter core is characterized in that it is made of a polymeric material.
Description
Technical field
The present invention is broadly directed to for selective catalytic reduction of nitrogen oxides (the Selective Catalytic Reduction to waste gas, SCR) equipment, described waste gas is produced by the burning of the air/fuel mixture in combustion process, the particularly vehicle internal combustion engine.
Background technology
SCR (SCR) is a kind of chemical process for reducing discharged nitrous oxides, wherein, chemical reagent (typically being nitrogenous reducing agent, for example ammonia or urea) is added in the waste gas, nitrogen oxide contained in itself and the waste gas is reacted, thereby produce molecular nitrogen (N
2) and water (H
2O).
In the situation with suitable catalyst, described chemical reagent is added in the waste gas, described catalyst can make the reduction reaction of nitrogen oxide occur in lower temperature (but necessarily being higher than 250 ° of C), and, natural reduction reacting phase ratio during with catalyst-free, described catalyst can also improve the performance of reaction.
In having the vehicle of internal combustion engine, reducing agent is generally the form of the additive of AdBlue by name.
Described additive is stable colourless aqueous liquid, and wherein 32.5% is urea, remains to be deionized water.It presents hypotoxicity, and is nonflammable also non-explosive without causing the risk of chronic disease, therefore, can use that simple and easy tank transports it on the vehicle.
Described additive injects waste gas streams by supply line, and this supply line flows directly in the blast pipe, is arranged in the upstream of SCR catalyst and is integrated in muffler for i. c. e, and described SCR catalyst accelerates the reduction of nitrogen oxide.
Waste gas streams goes out to enter circulation at catalyst inlet, thus behind engine start rapid heatable catalyst, cause reduction of nitrogen oxide and react necessary relatively-high temperature (approximately 250 ° of C) until reach.
When liquid additive entered blast pipe, the urea decomposition in the blast pipe was ammonia and dinitrogen oxide.Ammonia is with NO
xBe reduced to the reagent of molecular nitrogen and water.
The supply line of described additive comprises hold-up tank and pump, and described pump is used for extracting out the additive in the tank, transmits it to the dosing valve, and this dosing valve is by to materials quantitative described additive being injected blast pipe.
Also be provided with filter along supply line, it is usually located at the upstream of described pump, is used for the filter liquide additive.
Described filter comprises shell, and this shell has the entrance and exit that additive is used, and this shell is wrapped in the filter core of described additive stream warp, the impurity in the described filter core interception additive.
Described filter core is generally the film with pleat shape surface, and it is shaped as star, by making based on cellulosic material.
Yet, described can softening and rapidly corruption after being drenched by water or the aqueous solution based on cellulosic material, therefore to process aspect the employed additive its efficient low filtering SCR, poor durability.
Especially, the rapidly distortion of star film by this material is made loses its pleat shape and arrange, and present uncertain shape, and this has greatly limited available filter area.
For overcoming this defective, usually process the cellulosic material of described filtration membrane with some materials, to improve the compatibility of itself and additive, that is, when using special additive, described substance increases patience and the stability of described filtration membrane.
Yet, because urea and the aqueous solution are corrosive, although process through above-mentioned substance, still can't guarantee the stability of described filtration membrane based on cellulosic material.
The objective of the invention is, provide a kind of advantages of simple and not expensive scheme to overcome described defective.
The present invention seeks to realize by the described feature of independent claims.Dependent claims has been described preferred and/or particularly preferred aspect of the present invention.
Summary of the invention
The present invention provides a kind of equipment of the waste gas that produces for the treatment of internal combustion engine especially, this equipment comprises the pipeline for waste gas, the supply line of additive leads in the described pipeline, described additive makes the contained nitrogen oxide generation reduction reaction of waste gas, described equipment also comprises at least one filter core, it is made by polymeric material, is used for filtering described additive.
The urea additive that described polymeric material uses during compatible water and SCR process well, and can not be subjected to significantly the corrosive effects of additive; Therefore, compare with the filter that uses in current the type patent application, described filter core is more durable, and is more stable.
Preferably, described filter membrane is made by polypropylene, and polypropylene is one of usable polymers that has above-mentioned and the characteristic that additive is the most compatible.
Of the present invention one preferred aspect, described filter core is the in-depth filtration film, it has guaranteed filtration efficiency, also show strong accumulation ability, and this has guaranteed longer service life.
Described filter core also can be the surface filtration film with pleat shape surface, can have star shape.
Described filter core can be made by melt-blown process by polymer fiber.
Description of drawings
Further aspect of the present invention and advantage will present by following explanation, set forth by reference to the accompanying drawings non-limiting example in specification, wherein:
Fig. 1 has showed according to the equipment for the treatment of vehicle internal combustion engine waste gas of the present invention;
Fig. 2 is the cutaway view along the filter vertical plane, and this filter is used for additive, and is installed in the equipment of Fig. 1.
The specific embodiment
Fig. 1 has showed the equipment 1 for the treatment of 2 discharging waste gas of internal combustion engine, and described internal combustion engine 2 can be but be not limited to diesel engine, and it is installed on the vehicle, for example automobile, truck, bus or similar vehicles.
Described equipment 1 is used for making waste gas to accept SCR (Selective Catalytic Reduction, SRC) processing, contained nitrogen oxide (NO in the waste gas in processing procedure
x) through chemical reduction reaction, generate molecular nitrogen and water.
Described equipment 1 comprises the pipeline 3 for waste gas, it is the exhaust manifold of connecting engine 2 and the blast pipe of muffler in the present embodiment, described equipment also comprises the supply line 4 for additive, and described additive makes nitrogen oxide generation reduction reaction contained in the waste gas.
Described additive is reducing agent, is generally the form of nitrogenous liquid, and wherein approximately 32.5% composition is urea, and all the other are deionized water, and this additive is called AdBlue.
Described supply line 4 comprises tank 40 and pump 41, and described pump 41 picks up the additive in the tank 40, and it is sent into dosing valve 42, and this dosing valve according to dosage injects described additive in the exhaust piping 3.
Especially, described dosing valve 42 injects additive in the upstream of catalyst 30 in waste gas streams, and described catalyst 30 is integrated in the muffler, wherein has the catalytic specie that can accelerate reduction of nitrogen oxide.
After engine 2 started, the rapid heatable catalyst 30 of waste gas streams was until reach the necessary higher temperature of the reduction reaction that will cause nitrogen oxide (approximately 250 ° of C).Under this this condition, when additive entered in the blast pipe 3, the urea decomposition that dissolves in the additive was ammonia and dinitrogen oxide.Since high temperature and catalyst 30, described ammonia reductive NO
x, producing molecular nitrogen and water, these materials then enter in the atmosphere by muffler.
For correctly carrying out reduction reaction, must be based on contained NO in the temperature of waste gas and the waste gas
xRatio, inject additive with the amount after the calibration.This calibration is controlled automatically by electronic control module 9, the operation of the described electronic control module 9 described pumps 41 of control and dosing valve 42, response is from the signal of temperature inductor 90 and waste gas inductor 91, described temperature inductor 90 and waste gas inductor 91 are installed on the blast pipe 3, are preferably located in the downstream of catalyst 30.Supply line 4 comprises that further be used to the filter 5 that filters described additive, this filter 5 is preferably located between described tank 40 and the described pump 41.
As shown in Figure 2, described filter 5 comprises shell 50, this shell 50 is preferably made by polymeric material, its internal capacity is divided into two different cavity by core cylinder 6, wherein the first chamber 7 is communicated with input pipe 51, this input pipe 51 is for the additive that will filter, and the second chamber 8 links to each other with efferent duct 52, and this efferent duct 52 is for the additive that has filtered.
Especially, described shell 50 comprises cylindrical cup-shaped bottom container 53, but the mouth of this bottom container 53 by open type loam cake 54 closures, input pipe 51 and efferent duct 52 are fixedly mounted on respectively central authorities and the marginal position near described loam cake 54.
Described core cylinder 6 comprises the central cylindrical shape cage 60 between two coaxial gripper shoes, bottom plate 61 complete closed wherein, upper board 62 has the hollow sleeve 63 that is positioned at central authorities, and this sleeve pipe 63 is inserted in the inside of input pipe 51 by inserting sealing ring 64 removables.
Described central cage 60 is all made by polymeric material with described gripper shoe 61 and 62, is preferably the material with shell 50 same types.
Be inserted with coaxially the filter core 65 of near cylindrical in described central cage 60, this filter core 65 is fixed between the gripper shoe 61 and 62 of described core cylinder 6.Described additive stream flows to described the second chamber 8 from described the first chamber 7, to intercept and capture any impurity that contains in the additive.
Described filter core 65 is made by polymeric material, be preferably can be good fit with the additive that will filter polypropylene, that is, and when additive stream through and when soaking this material, it can not be corroded, destroys or become soft.
Like this, described filter core 65 has the longer life-span than the filter core that uses in such application in the prior art, and efficient is better, and stability is better.
Of the present invention one preferred aspect, described filter core 65 is made by the polymeric material identical with described shell 50, central cage 60 and gripper shoe 61 and 62.
Like this, although the processing technology that other parts of described filter core 65, shell 50 and core cylinder 6 need is had nothing in common with each other, it still has advantages of and reduces raw-material service cost and to the cost of filter 5 waste disposals, because described filter 5 can come the whole waste disposal that carries out by the simple process that polymeric material has been stipulated, need not dismounting or waste separation.
Especially, described filter core 65 can be made by the polymer fiber nonwoven, can be processed into by for example melting and spraying.
In the embodiment of above elaboration, described filter core 65 is the in-depth filtration film, and this in-depth filtration film place guarantees outside the good filter effect, and impurity is just gathered before soaking in a large number, thereby has prolonged significantly the service life of described filter 5.
However, the present invention is ruled it out not: described filter core 65 is the form of slim pleat shape skin covering of the surface, and it is wrapped on the axis of centres, to form star.
Obviously, those skilled in the art can under the scope that does not break away from claim of the present invention, introduce a large amount of fixed cases identical with the technological essence of the said equipment 1.
Claims (14)
1. the equipment of a waste gas that produces for the treatment of combustion process, this equipment comprises the pipeline (3) for waste gas, the supply line of additive (4) leads in the described pipeline (3), described additive makes the contained nitrogen oxide generation reduction reaction of waste gas, described equipment also comprises be used to the filter core that filters described additive (65), it is characterized in that, described filter core (65) is made by polymeric material.
2. equipment according to claim 1, it is characterized in that: described filter core (65) is made by polypropylene.
3. equipment according to claim 1, it is characterized in that: described filter core (65) is the in-depth filtration film.
4. equipment according to claim 1, it is characterized in that: described filter core (65) is the pleat film.
5. equipment according to claim 1, it is characterized in that: described filter core (65) makes by melt-blown process.
6. equipment according to claim 1, it is characterized in that: described filter core (65) is included in the housing (50) of being made by polymeric material, this housing (50) has at least one entrance (51) of the additive that will filter and an outlet (52), and described filter core (65) is made by the polymeric material identical with described housing (50).
7. equipment according to claim 1, it is characterized in that: described filter core (65) is subject to the bracing or strutting arrangement (60 made by polymeric material, 61,62) restriction, described filter core (65) is by described bracing or strutting arrangement (60,61,62) be installed in the housing, this housing has at least one entrance (51) of the additive that will filter and an outlet (52), described filter core (65) by with described bracing or strutting arrangement (60,61,62) identical polymeric material is made.
8. the purposes of the filter core of being made by polymeric material (65), described filter core is used for filtration additives, the reduction reaction of nitrogen oxide in the described additive operating equipment, the waste gas that described equipment produces for the treatment of internal combustion engine.
9. the purposes of filter core according to claim 8, it is characterized in that: described filter core (65) is made by polypropylene.
10. the purposes of filter core according to claim 8, it is characterized in that: described filter core (65) is the in-depth filtration film.
11. the purposes of filter core according to claim 8 is characterized in that: described filter core (65) is the pleat film.
12. the purposes of filter core according to claim 8 is characterized in that: described filter core (65) makes by melt-blown process.
13. the purposes of filter core according to claim 8, it is characterized in that: described filter core (65) is contained in the housing (50) of being made by polymeric material, this housing (50) has at least one entrance (51) of the additive that will filter and an outlet (52), and described filter core (65) is made by the polymeric material identical with described housing (50).
14. the purposes of filter core according to claim 8, it is characterized in that: described filter core (65) is subject to the bracing or strutting arrangement (60 made by polymeric material, 61,62) restriction, described filter core (65) is by described bracing or strutting arrangement (60,61,62) be installed in the housing, this housing has at least one entrance (51) of the additive that will filter and an outlet (52), described filter core (65) by with described bracing or strutting arrangement (60,61,62) identical polymeric material is made.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102326948A CN102935331A (en) | 2011-08-15 | 2011-08-15 | Apparatus for reducing nitrogen oxides in exhaust gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102326948A CN102935331A (en) | 2011-08-15 | 2011-08-15 | Apparatus for reducing nitrogen oxides in exhaust gas |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102935331A true CN102935331A (en) | 2013-02-20 |
Family
ID=47694271
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011102326948A Pending CN102935331A (en) | 2011-08-15 | 2011-08-15 | Apparatus for reducing nitrogen oxides in exhaust gas |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1173586A (en) * | 1996-07-25 | 1998-02-18 | Ufi万能过滤器国际公开有限公司 | Fuel filter, in particular for diesel fuel |
| DE102006050807A1 (en) * | 2006-10-27 | 2008-04-30 | Robert Bosch Gmbh | Catalytic reduction device for reduction of nitric oxide in a flue gas system for motor vehicle, comprises a reducing agent tank, a reducing agent-conveyer system having electrical conveying pump, and reducing agent-filter |
| WO2010007053A1 (en) * | 2008-07-18 | 2010-01-21 | Ufi Innovation Center S.R.L. | A plant for reducing the nitrogen oxides in exhaust gases |
| CN101793183A (en) * | 2010-03-13 | 2010-08-04 | 中国第一汽车集团公司 | Jet control system utilizing air power to atomize urea reductant |
| CN101977668A (en) * | 2008-01-16 | 2011-02-16 | 舒赫有限责任公司 | Flue gas purification plant |
| CN101979846A (en) * | 2009-06-17 | 2011-02-23 | 通用汽车环球科技运作公司 | Exhaust gas treatment system including a lean NOx trap and two-way catalyst and method of using the same |
-
2011
- 2011-08-15 CN CN2011102326948A patent/CN102935331A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1173586A (en) * | 1996-07-25 | 1998-02-18 | Ufi万能过滤器国际公开有限公司 | Fuel filter, in particular for diesel fuel |
| DE102006050807A1 (en) * | 2006-10-27 | 2008-04-30 | Robert Bosch Gmbh | Catalytic reduction device for reduction of nitric oxide in a flue gas system for motor vehicle, comprises a reducing agent tank, a reducing agent-conveyer system having electrical conveying pump, and reducing agent-filter |
| CN101977668A (en) * | 2008-01-16 | 2011-02-16 | 舒赫有限责任公司 | Flue gas purification plant |
| WO2010007053A1 (en) * | 2008-07-18 | 2010-01-21 | Ufi Innovation Center S.R.L. | A plant for reducing the nitrogen oxides in exhaust gases |
| CN101979846A (en) * | 2009-06-17 | 2011-02-23 | 通用汽车环球科技运作公司 | Exhaust gas treatment system including a lean NOx trap and two-way catalyst and method of using the same |
| CN101793183A (en) * | 2010-03-13 | 2010-08-04 | 中国第一汽车集团公司 | Jet control system utilizing air power to atomize urea reductant |
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Application publication date: 20130220 |