CN204283567U - A kind of serial type diesel engine selective catalysis after-treatment device - Google Patents
A kind of serial type diesel engine selective catalysis after-treatment device Download PDFInfo
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- CN204283567U CN204283567U CN201420709798.2U CN201420709798U CN204283567U CN 204283567 U CN204283567 U CN 204283567U CN 201420709798 U CN201420709798 U CN 201420709798U CN 204283567 U CN204283567 U CN 204283567U
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Abstract
The utility model discloses a kind of serial type diesel engine selective catalysis after-treatment device, comprise urea-spray mouth, urea mixer, ammonia gas sensor, NOx sensor, and the urea mixing tube connected successively, the catalyst tank of one-level selective catalytic reduction, the catalyst tank of Second Order Selectivity catalytic reduction and outlet pipe; Ammonia gas sensor is arranged between the catalyst tank of one-level selective catalytic reduction and the catalyst tank of Second Order Selectivity catalytic reduction; After NOx sensor is separately positioned on the catalyst tank of Second Order Selectivity catalytic reduction, and between the catalyst tank of the catalyst tank of one-level selective catalytic reduction and Second Order Selectivity catalytic reduction.The serial type diesel engine selective catalysis after-treatment device that the utility model provides, can realize higher transformation efficiency of the oxides of nitrogen and lower ammonia escapement ratio simultaneously.
Description
Technical field
The utility model relates to the diesel engine selective catalysis after-treatment device in a kind of diesel engine vent gas treatment technology, particularly, relates to a kind of serial type diesel engine selective catalysis after-treatment device.
Background technique
Compared with petrol engine, there is significant shortcoming etc. the exhaust emissions of diesel engine of discharge capacity.Wherein, nitrogen oxide (NO
x) and the discharge of particulate matter (PM) is too high limits the application of diesel engine and increased the weight of the pressure of vent gas treatment.As everyone knows, nitrogen oxide is the main reason forming acid rain; And particulate matter easily causes haze and photochemical smog.In recent years the environmental problem of the most serious and most headache of Chinese city is no more than the generation of haze, and the discharge of high particulate matter also will hinder the development of diesel-oil vehicle and universal.The pollution of atmosphere caused along with emission from vehicles is to people's life and the aggravation of Influence of production, and the regulation of various countries is increasingly strict to the emission limit set of diesel engine.In the middle of state III standard, the emission limit set of nitrogen oxide is 5g/kWh, is granular material dischargedly restricted to 0.1g/kWh.In the middle of state IV standards, the emission limit set of nitrogen oxide reduces to 3.5g/kWh, and 0.02g/kWh is reduced in granular material discharged restriction.In the middle of state V standard, the emission limit set of nitrogen oxide reduces to 2g/kWh further.The standard from state III to state V, the emission limit set of nitrogen oxide and particulate matter declines 60% and 80% respectively.Increasing substantially of standard, can reduce the discharge of diesel-oil vehicle pollutant effectively, promotes the development of diesel-oil vehicle and popularizes.But in addition on the one hand, strict Abgasgesetz, proposes new challenge to car load factory and diesel engine company.
On diesel engine, selective catalytic reduction (Selective Catalytic Reduction, SCR) technology is often referred to using ammonia as reducing agent, by the NO in tail gas
xbe reduced into nitrogen.SCR technology is believed to the most promising a kind of technology of satisfied following discharged nitrous oxides regulation.First, the source of ammonia is relatively more extensive and price is not very high, has urea liquid also to have solid urea particle; Secondly, SCR technology can improve the Economy of fuel oil than discarded recirculating technique, the cost of adequate compensation urea liquid; SCR technology is not very high to the quality requirements of fuel oil itself again, is particularly useful for the national conditions that China's this fuel oil sulphur content is too high.Due to the outstanding advantages of SCR technology, this technology will become and meet diesel engine future, the especially main method of large diesel engine discharged nitrous oxides regulation.
Basic principle based on the SCR system of urea liquid is: (1) sprays urea liquid in the front of catalyst tank suction port; (2) urea liquid is converted into the ammonia of gaseous state in the tail gas environment of high temperature (more than 180 DEG C); (3) gaseous state ammonia enters catalyst tank and catalyzed dose of absorption; (4) reaction of nitrogen oxides in the ammonia adsorbed and tail gas generates nitrogen and water.
If the urea liquid amount of spraying is suitable, the most nitrogen oxide in tail gas can be converted into harmless gas; If the urea liquid amount of spraying is inadequate, nitrogen oxide can not be converted to greatest extent, and perhaps Abgasgesetz just can not meet; If the urea liquid amount of spraying is too much, superfluous ammonia will escape in the middle of air, and because ammonia belongs to greenhouse gases and poisonous, the ammonia of escape not only causes the waste of urea, and formation secondary pollution.
Through finding prior art literature search, SCR equipment of the prior art is single-stage catalyst tank, is difficult to meet higher transformation efficiency of the oxides of nitrogen and lower ammonia escapement ratio simultaneously.
Model utility content
The purpose of this utility model is to provide a kind of for the diesel engine selective catalysis after-treatment device in diesel engine vent gas process, provides a kind of catalyst tank arrangement of serial type on the one hand; Provide corresponding sensor arrangement, to solve the contradictory problems between transformation efficiency of the oxides of nitrogen and ammonia escapement ratio on the one hand in addition.
In order to achieve the above object, the utility model provides a kind of serial type diesel engine selective catalysis after-treatment device, wherein, this device comprises urea-spray mouth, urea mixer, ammonia gas sensor, NOx sensor, and the urea mixing tube connected successively, the catalyst tank of one-level selective catalytic reduction, the catalyst tank of Second Order Selectivity catalytic reduction and outlet pipe; One end of described urea mixing tube is provided with urea-spray mouth, and the other end is connected with the catalyst tank of one-level selective catalytic reduction; Urea mixing tube place between described urea-spray mouth and the catalyst tank of one-level selective catalytic reduction is provided with urea mixer; Described ammonia gas sensor is arranged between the catalyst tank of one-level selective catalytic reduction and the catalyst tank of Second Order Selectivity catalytic reduction; After described NOx sensor is separately positioned on the catalyst tank of Second Order Selectivity catalytic reduction, and between the catalyst tank of the catalyst tank of one-level selective catalytic reduction and Second Order Selectivity catalytic reduction.
Above-mentioned serial type diesel engine selective catalysis after-treatment device, wherein, the catalyst tank of described one-level selective catalytic reduction is connected by connecting tube with between the catalyst tank of Second Order Selectivity catalytic reduction.That is, the catalyst tank of one-level selective catalytic reduction and the catalyst tank of Second Order Selectivity catalytic reduction are in series, and form series connection SCR aftertreatment system.The length of this connecting tube is preferably 10 cm.
Above-mentioned serial type diesel engine selective catalysis after-treatment device, wherein, the catalyst tank of described one-level selective catalytic reduction can remove the nitrogen oxide in diesel engine vent gas, and the catalyst tank of described Second Order Selectivity catalytic reduction can adsorb the ammonia of escaping out in the catalyst tank of one-level selective catalytic reduction.Respectively catalyzer is housed in the catalyst tank of one-level selective catalytic reduction and the catalyst tank of Second Order Selectivity catalytic reduction, it can adsorptive gaseous ammonia, then generates nitrogen and water with the reaction of nitrogen oxides in tail gas.Described catalyzer preferably adopts copper base zeolitic material.
Above-mentioned serial type diesel engine selective catalysis after-treatment device, wherein, described NOx sensor, comprise be located at one-level selective catalytic reduction the connecting tube between catalyst tank and the catalyst tank of Second Order Selectivity catalytic reduction on the first NOx sensor, and the second NOx sensor on outlet pipe after the catalyst tank being arranged on Second Order Selectivity catalytic reduction.
Above-mentioned serial type diesel engine selective catalysis after-treatment device, wherein, the first described NOx sensor and ammonia gas sensor can detect nitrous oxides concentration between the catalyst tank of one-level selective catalytic reduction and the catalyst tank of Second Order Selectivity catalytic reduction and ammonia concentration respectively; The second described NOx sensor can detect the nitrous oxides concentration in the outlet pipe after the catalyst tank of Second Order Selectivity catalytic reduction.Preferably, ammonia gas sensor is located at the top of connecting tube, and the first NOx sensor and the second NOx sensor are located at the bottom of connecting tube and the bottom of outlet pipe respectively.
Above-mentioned serial type diesel engine selective catalysis after-treatment device, wherein, described device can pass through the urea injecting quantity of the checkout value adjustment urea-spray mouth of the first NOx sensor, the second NOx sensor and ammonia gas sensor.Preferably, the signal of sensor passes to controller by CAN, then by the control of described controller to urea-spray mouth, realizes the adjustment of urea injecting quantity.In order to realize higher transformation efficiency of the oxides of nitrogen and lower ammonia escapement ratio simultaneously, the ammonia coverage scale of the catalyst tank of one-level selective catalytic reduction must be higher, and the ammonia coverage scale of the catalyst tank of Second Order Selectivity catalytic reduction must be lower.In order to realize ammonia coverage scales different in two-stage catalyst tank, urea injecting quantity must automatically adjust according to the nitrous oxides concentration in the ammonia concentration in the middle of catalyst tank, nitrous oxides concentration and tailpipe.Described device provides corresponding sensor, can realize the regulatory demand of urea injecting quantity.
Above-mentioned serial type diesel engine selective catalysis after-treatment device, wherein, described urea-spray mouth is arranged on the top of urea mixing tube obliquely, and liquid urea can be tilted inject urea mixing tube inside by from top to bottom.
Above-mentioned serial type diesel engine selective catalysis after-treatment device, wherein, the mouth of pipe that described urea mixing tube is provided with urea-spray mouth one end is inlet end, can receive diesel engine vent gas.Diesel engine vent gas can transfer the liquid urea that urea-spray mouth is injected to gaseous state ammonia with high temperature.Described urea-spray mouth is that the hollow of pointed end is tapered, and the outer wall of described tapered axis and urea mixing tube inlet end acutangulates.
Above-mentioned serial type diesel engine selective catalysis after-treatment device, wherein, described urea mixing tube, the urea injecting urea mixing tube inside can mix with the diesel engine vent gas entered by inlet end by the urea mixer set by it.Described urea mixer preferably mixes in the mode of Stirring.
Above-mentioned serial type diesel engine selective catalysis after-treatment device, wherein, described can realize higher transformation efficiency of the oxides of nitrogen (more than 95%) and lower ammonia escapement ratio (peak value 30ppm, average 10ppm) simultaneously.
The serial type diesel engine selective catalysis after-treatment device that the utility model provides has the following advantages:
The utility model is owing to there being the catalysts selective tank of serial type, and first catalyst tank is used for convert nitrogen oxides, and second catalyst tank is used for absorbing ammonia.Under auxiliary without extras, higher transformation efficiency of the oxides of nitrogen and lower ammonia escape amount can be realized simultaneously.
Owing to there being the feedback information of sensor, the emitted dose of urea nozzle according to running state change adjustment, can realize the conformity target under different situations.
Accompanying drawing explanation
Fig. 1 is the structural representation of serial type diesel engine selective catalysis after-treatment device of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is further described.
As shown in Figure 1, the serial type diesel engine selective catalysis after-treatment device that the utility model provides, comprise urea-spray mouth 1, urea mixer 8, ammonia gas sensor 3, NOx sensor, and the urea mixing tube 9 connected successively, (SCR) catalyst tank 2 of one-level selective catalytic reduction, (SCR) catalyst tank 4 of Second Order Selectivity catalytic reduction and outlet pipe 5.
One end of urea mixing tube 9 is provided with urea-spray mouth 1, and the other end is connected with one-level SCR catalyst tank 2.Urea mixing tube 9 place between urea-spray mouth 1 and one-level SCR catalyst tank 2 is provided with urea mixer 8.Urea-spray mouth 1 is arranged on the top of urea mixing tube 9 obliquely, and it is inner that liquid urea can be tilted to inject urea mixing tube 9 by from top to bottom.The mouth of pipe that urea mixing tube 9 is provided with urea-spray mouth 1 one end is inlet end, can receive diesel engine vent gas.Diesel engine vent gas the liquid urea that urea-spray mouth 1 is injected can be transferred to gaseous state ammonia with high temperature.Urea-spray mouth 1 is that the hollow of pointed end is tapered, and the outer wall of tapered axis and urea mixing tube 9 inlet end acutangulates.The urea injecting urea mixing tube 9 inside can mix with the diesel engine vent gas entered by inlet end by the urea mixer 8 set by urea mixing tube 9.Urea mixer 8 preferably mixes in the mode of Stirring.
Connected by connecting tube 10 between one-level SCR catalyst tank 2 with secondary SCR catalyst tank 4.That is, one-level SCR catalyst tank 2 and secondary SCR catalyst tank 4 are in series, and form series connection SCR aftertreatment system.The length of this connecting tube 10 is preferably 10 cm.
One-level SCR catalyst tank 2 can remove the nitrogen oxide in diesel engine vent gas, and secondary SCR catalyst tank 4 can adsorb the ammonia of escaping out in one-level SCR catalyst tank 2.Respectively catalyzer is housed in one-level SCR catalyst tank 2 and secondary SCR catalyst tank 4, it can adsorptive gaseous ammonia, then generates nitrogen and water with the reaction of nitrogen oxides in tail gas.Catalyzer preferably adopts copper base zeolitic material.
Ammonia gas sensor 3 is arranged between one-level SCR catalyst tank 2 and secondary SCR catalyst tank 4.
NOx sensor comprises the first NOx sensor 7 on the connecting tube 10 that is located between one-level SCR catalyst tank 2 and secondary SCR catalyst tank 4, and is arranged on the second NOx sensor 6 on the outlet pipe 5 after secondary SCR catalyst tank 4.
First NOx sensor 7 and ammonia gas sensor 3 can detect nitrous oxides concentration between one-level SCR catalyst tank 2 and secondary SCR catalyst tank 4 and ammonia concentration respectively; Second NOx sensor 6 can detect the nitrous oxides concentration in the outlet pipe 5 after secondary SCR catalyst tank 4.Preferably, ammonia gas sensor 3 is located at the top of connecting tube 10, and the first NOx sensor 7 and the second NOx sensor 6 are located at the bottom of connecting tube 10 and the bottom of outlet pipe 5 respectively.
The serial type diesel engine selective catalysis after-treatment device that the utility model provides, can pass through the urea injecting quantity of the checkout value adjustment urea-spray mouth 1 of the first NOx sensor 7, second NOx sensor 6 and ammonia gas sensor 3.Preferably, the signal of sensor passes to controller by CAN, then by the control of controller to urea-spray mouth 1, realizes the adjustment of urea injecting quantity.
This device can realize higher transformation efficiency of the oxides of nitrogen (more than 95%) and lower ammonia escapement ratio (peak value 30ppm, average 10ppm) simultaneously.In order to realize higher transformation efficiency of the oxides of nitrogen and lower ammonia escapement ratio simultaneously, the ammonia coverage scale of one-level SCR catalyst tank 2 must be higher, and the ammonia coverage scale of secondary SCR catalyst tank 4 must be lower.In order to realize ammonia coverage scales different in two-stage catalyst tank, urea injecting quantity must automatically adjust according to the nitrous oxides concentration in the ammonia concentration in the middle of catalyst tank, nitrous oxides concentration and tailpipe.Device provides corresponding sensor, can realize the regulatory demand of urea injecting quantity.
The workflow of the serial type diesel engine selective catalysis after-treatment device that the utility model provides is: diesel engine vent gas (waste gas), and---> urea-spray------discharge > urea mixer 8 to transform---transforming in > secondary SCR catalyst tank 4---in > one-level SCR catalyst tank 2 by > outlet pipe 5.Specific as follows: waste gas enters urea mixing tube 9, the controller of this series connection SCR device is according to current running state (the nitrogen oxide discharge capacity of diesel engine, gas concentration in the middle of catalyst tank, tailpipe 5 gas concentration) spray liquid urea, liquid urea urea mixer 8 auxiliary under be uniformly distributed in urea mixing tube 9, liquid urea is converted into gaseous state ammonia under the high temperature of waste gas, gaseous state ammonia enters one-level SCR catalyst tank 2 and by the Catalyst Adsorption in it, then nitrogen and water is generated with the reaction of nitrogen oxides in waste gas, unreacted ammonia enters secondary SCR catalyst tank 4 and by the catalyzer in it, fraction nitrogen oxide reacts in secondary SCR catalyst tank 4, the nitrogen oxide that unreacted completes enters in the middle of air.
The serial type diesel engine selective catalysis after-treatment device that the utility model provides, the first order is mainly used to remove the nitrogen oxide in tail gas, the second level is used for adsorbing the first order ammonia of escaping out, can realize higher transformation efficiency of the oxides of nitrogen and lower ammonia escapement ratio simultaneously.
Although content of the present utility model has done detailed introduction by above preferred embodiment, will be appreciated that above-mentioned description should not be considered to restriction of the present utility model.After those skilled in the art have read foregoing, for multiple amendment of the present utility model and substitute will be all apparent.Therefore, protection domain of the present utility model should be limited to the appended claims.
Claims (8)
1. a serial type diesel engine selective catalysis after-treatment device, it is characterized in that, this device comprises urea-spray mouth (1), urea mixer (8), ammonia gas sensor (3), NOx sensor, and the urea mixing tube connected successively (9), the catalyst tank (2) of one-level selective catalytic reduction, the catalyst tank (4) of Second Order Selectivity catalytic reduction and outlet pipe (5);
One end of described urea mixing tube (9) is provided with urea-spray mouth (1), and the other end is connected with the catalyst tank (2) of one-level selective catalytic reduction; Urea mixing tube (9) place between described urea-spray mouth (1) and the catalyst tank (2) of one-level selective catalytic reduction is provided with urea mixer (8);
Described ammonia gas sensor (3) is arranged between the catalyst tank (2) of one-level selective catalytic reduction and the catalyst tank (4) of Second Order Selectivity catalytic reduction;
After described NOx sensor is separately positioned on the catalyst tank (4) of Second Order Selectivity catalytic reduction, and between the catalyst tank (4) of the catalyst tank of one-level selective catalytic reduction (2) and Second Order Selectivity catalytic reduction.
2. serial type diesel engine selective catalysis after-treatment device as claimed in claim 1, it is characterized in that, connected by connecting tube (10) between the catalyst tank (2) of described one-level selective catalytic reduction and the catalyst tank (4) of Second Order Selectivity catalytic reduction.
3. serial type diesel engine selective catalysis after-treatment device as claimed in claim 2, it is characterized in that, described NOx sensor, comprise be located at one-level selective catalytic reduction the connecting tube (10) between catalyst tank (2) and the catalyst tank (4) of Second Order Selectivity catalytic reduction on the first NOx sensor (7), and the second NOx sensor (6) on outlet pipe (5) after the catalyst tank (4) being arranged on Second Order Selectivity catalytic reduction.
4. serial type diesel engine selective catalysis after-treatment device as claimed in claim 3, it is characterized in that, described the first NOx sensor (7) and ammonia gas sensor (3) can detect nitrous oxides concentration between the catalyst tank (2) of one-level selective catalytic reduction and the catalyst tank (4) of Second Order Selectivity catalytic reduction and ammonia concentration respectively; Described the second NOx sensor (6) can detect the nitrous oxides concentration in the outlet pipe (5) after the catalyst tank (4) of Second Order Selectivity catalytic reduction.
5. serial type diesel engine selective catalysis after-treatment device as claimed in claim 4, it is characterized in that, described device can pass through the urea injecting quantity of checkout value adjustment urea-spray mouth (1) of the first NOx sensor (7), the second NOx sensor (6) and ammonia gas sensor (3).
6. serial type diesel engine selective catalysis after-treatment device as claimed in claim 5, it is characterized in that, described urea-spray mouth (1) is arranged on the top of urea mixing tube (9) obliquely, and it is inner that liquid urea can be tilted to inject urea mixing tube (9) by from top to bottom.
7. serial type diesel engine selective catalysis after-treatment device as claimed in claim 6, it is characterized in that, described urea mixing tube (9), its mouth of pipe being provided with urea-spray mouth (1) one end is inlet end, can receive diesel engine vent gas.
8. serial type diesel engine selective catalysis after-treatment device as claimed in claim 7, it is characterized in that, described urea mixing tube (9), the urea injecting urea mixing tube (9) inner can mix with the diesel engine vent gas entered by inlet end by the urea mixer (8) set by it.
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| CN201420709798.2U CN204283567U (en) | 2014-11-24 | 2014-11-24 | A kind of serial type diesel engine selective catalysis after-treatment device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109339912A (en) * | 2018-10-22 | 2019-02-15 | 北京工业大学 | A kind of method and device suitable for the control of high-power diesel engine nitrogen oxides |
| CN116291834A (en) * | 2023-03-22 | 2023-06-23 | 盐城工学院 | SCR series system of high-density diesel engine |
-
2014
- 2014-11-24 CN CN201420709798.2U patent/CN204283567U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109339912A (en) * | 2018-10-22 | 2019-02-15 | 北京工业大学 | A kind of method and device suitable for the control of high-power diesel engine nitrogen oxides |
| CN109339912B (en) * | 2018-10-22 | 2020-07-03 | 北京工业大学 | Method and device suitable for controlling nitrogen oxides of high-power diesel engine |
| CN116291834A (en) * | 2023-03-22 | 2023-06-23 | 盐城工学院 | SCR series system of high-density diesel engine |
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Granted publication date: 20150422 Termination date: 20171124 |