CN102322325A - Engine and device for reducing emission load of oxynitrides thereof - Google Patents
Engine and device for reducing emission load of oxynitrides thereof Download PDFInfo
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- CN102322325A CN102322325A CN201110229974A CN201110229974A CN102322325A CN 102322325 A CN102322325 A CN 102322325A CN 201110229974 A CN201110229974 A CN 201110229974A CN 201110229974 A CN201110229974 A CN 201110229974A CN 102322325 A CN102322325 A CN 102322325A
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Abstract
The invention discloses a device for reducing the emission load of oxynitrides of an engine, which comprises a detection device, an electronic control unit, a urea supplying unit, a urea spraying unit and a catalytic reduction reaction unit, wherein the detection device is used for detecting the temperature of an exhaust pipe of the engine and the concentration of the oxynitrides in the exhaust pipe to acquire a detection signal and transmitting the detection signal to the electronic control unit; the electronic control unit is connected with the urea supplying unit and the urea spraying unit and is matched with a control unit of the engine to control the spraying state of the urea spraying unit; a nozzle of the urea spraying unit is arranged on the exhaust pipe of the engine; and the catalytic reduction reaction unit is arranged in the exhaust pipe at the rear of the nozzle and comprises a first-stage oxynitride catalyzing device and a second-stage oxynitride catalyzing device which are sequentially arranged along the exhaust pipe. Through the device disclosed by the invention, higher oxynitride conversion efficiency under all the working conditions can be achieved while lower ammonia leakage is ensured. The invention also discloses the engine.
Description
Technical field
The present invention relates to the motor exhaust processing technology field, particularly relate to a kind of device that reduces the discharge amount of motor oxynitrides.The invention still further relates to a kind of motor that comprises the discharge amount that reduces the motor oxynitrides.
Background technique
Along with the increasingly stringent of motor vehicle exhaust emission rules, the engine exhaust post-processing technology more and more receives people's attention.
In numerous exhaust aftertreatment methods, SCR (SCR) technology becomes one of key technology of motor oxynitrides emission control.
Please refer to Fig. 1, Fig. 1 is the structural representation of a kind of device of the discharge amount that reduces the motor oxynitrides in the existing technology.
In the existing technology; The SCR system that with urea is reducing agent mainly comprises the feed unit 23 of electronic control unit 24, urea, the injection unit 21 and catalytic reduction reaction unit 25 4 parts of urea; Wherein, Electronic control unit 24 integrates with the control unit (ECU) 22 of motor, and the communication that is mainly used between injection unit 21, catalytic reduction reaction unit 25 and the motor 11 of the feed unit 23 of accomplishing urea and urea connects and control; The feed unit 23 of urea mainly comprises urea box and urea pump; The injection unit 21 of urea mainly comprises urea nozzle and heating module; Be used at regular time and quantity spraying urea liquid being mapped to exhaust airstream, to guarantee the abundant atomizing and the decomposition of urea liquid according to demand; Catalytic reduction reaction unit 25 comprises SCR catalyst converter etc.; Be used to provide catalytic condition; Main harmful components nitrogen oxide in the engine exhaust is reduced to nitrogen; The SCR catalyst converter is the core component of this system, and the quality of its performance directly has influence on transformation efficiency, conversion volume, conversion cost and the reliability of whole after-treatment system.
Wherein, SCR system works principle is: the exhaust of motor 11 is flowed out the back from its cylinder 114 and is flowed into the outlet pipe 116; Simultaneously; The urea-spray device 21 that is installed on the outlet pipe 116 sprayed into quantitative aqueous solution of urea in the outlet pipe 116 with vaporific form in the appropriate moment; Urea droplets issues unboiled water in the high-temp waste gas effect and separates and pyrolytic reaction generation reducing agent ammonia, and ammonia mixes with the tail gas of motor, and the oxynitrides in certain temperature and the following tail gas of catalytic condition is reduced to nitrogen (N
2), also generate water (H simultaneously
2O), the effect of catalysis mainly is the activation energy that reduces the oxynitrides reduction reaction, and its reaction temperature is reduced between 200～550 ℃.
The working efficiency of SCR system depends on the temperature of gas, if in 200 ℃ to 550 ℃ temperature range, work, it can be converted into 85% oxynitrides nitrogen (N2) and water (H2O); Be lower than under 200 ℃ the situation and during engine cold-start, the oxynitrides conversion ratio of SCR catalyst converter is very low even not to work at gas temperature, and conversion ratio must be more than 50% for the IV standard of Europe; For Europe V standard, conversion ratio just must be more than 70% under the test operating mode, and for Europe VI standard; Conversion ratio just must be more than 90%; Therefore, in order to improve conversion ratio, need spray more diuresis element; And can cause like this and cause secondary pollution by ammonia leakage.
In sum, mainly there is following problem in the existing SCR system: the one, and the oxynitrides conversion ratio under cold start-up operating mode and worst cold case is very low, can't under all operating modes, all obtain sufficiently high oxynitrides conversion efficiency; The 2nd, maximum oxynitrides conversion ratio receives the restriction that acceptable ammonia (NH3) leaks; Thereby adopt the existing SCR system to leak the very difficulty that becomes, instantaneous exceed standard or ammonia leaks and exceeds standard of particularly in the transient test circulation, causing discharging easily to reach higher oxynitrides conversion ratio and lower ammonia simultaneously.
Therefore, how to guarantee to obtain oxynitrides conversion efficiency higher under all operating modes on the basis of leakage of lower ammonia, just become the present technical issues that need to address of those skilled in the art.
Summary of the invention
The purpose of this invention is to provide a kind of device that reduces the discharge amount of motor oxynitrides, this device can obtain oxynitrides conversion efficiency higher under all operating modes in the leakage that guarantees lower ammonia.Another object of the present invention provides a kind of motor of device of the discharge amount that comprises above-mentioned reduction motor oxynitrides.
For solving the problems of the technologies described above; The present invention provides a kind of device that reduces the discharge amount of motor oxynitrides; Comprise detection device, electronic control unit, urea supply unit, urea-spray unit and catalytic reduction reaction unit; Said detection device detects the concentration of oxynitrides in temperature and the said outlet pipe of said waste pipe; Obtain testing signal, its output terminal is connected with said electronic control unit, and said testing signal is transferred to said electronic control unit; Said electronic control unit is connected with said urea-spray unit with said urea supply unit; And cooperate the spray regime of the said urea-spray of control unit with the control unit of said motor, and said urea supply unit is connected with said urea-spray unit, and the arrangement of nozzles of said urea-spray unit is on said waste pipe; Said catalytic reduction reaction unit is arranged in the said outlet pipe at said nozzle rear, and said catalytic reduction reaction unit comprises first order oxynitrides catalyst converter and the second level oxynitrides catalyst converter that sets gradually along said outlet pipe.
Preferably, said first order oxynitrides catalyst converter next-door neighbour turbosupercharger, and volume is less than the volume of said second level oxynitrides catalyst converter.
Preferably, said detection device comprises exhaust gas temperature sensor and oxynitrides sensor
Preferably, said urea supply unit comprises urea box and urea pump, and the inlet of said urea pump is connected with said urea box through pipeline, and its outlet is connected with said urea-spray unit through pipeline.
Preferably, said urea supply unit also comprises heating module, and said heating module is connected with said urea box.
For addressing the above problem; The present invention also provides a kind of motor; Comprise the device of body and the discharge amount that reduces the motor oxynitrides, the device of the discharge amount of said reduction motor oxynitrides is the device of the discharge amount of above-mentioned each described reduction motor oxynitrides.
Preferably, also comprise turbosupercharger, the booster turbine of said turbosupercharger is arranged in the said outlet pipe, and between the nozzle of said engine body and said urea-spray unit.
Preferably, said turbosupercharger comprises said booster turbine and gas compressor, and said booster turbine drives said gas compressor through its turbine shaft, the inlet of said gas compressor and atmosphere, and its outlet is communicated with the suction tude of said motor.
Preferably, also comprise particulate filter, said particulate filter is arranged in the outlet pipe at rear, said catalytic reduction reaction unit.
The device of the discharge amount of reduction motor oxynitrides provided by the present invention; Comprise detection device, electronic control unit, urea supply unit, urea-spray unit and catalytic reduction reaction unit, wherein, the concentration of oxynitrides in the temperature of the outlet pipe of detection device detection of engine and the outlet pipe; Obtain testing signal; Its output terminal is connected with electronic control unit, and testing signal is transferred to electronic control unit, and electronic control unit is connected with the urea-spray unit with the urea supply unit; And cooperatively interact with the control unit of motor; Control urea-spray unit is at the urea of reasonable time injection appropriate amount, and the urea supply unit is connected with the urea-spray unit, becomes the urea source of urea-spray unit; The arrangement of nozzles of urea-spray unit is on waste pipe; Thereby to waste pipe, make urea under high temperature condition, produce the reducing agent ammonia urea-spray in the urea supply unit, the catalytic reduction reaction unit is arranged in the outlet pipe at nozzle rear; To reduce the needed reaction temperature of catalytic reduction reaction of oxynitrides and ammonia, the catalytic reduction reaction unit specifically comprises first order oxynitrides catalyst converter and the second level oxynitrides catalyst converter that sets gradually along outlet pipe.In the working procedure; Detection device constantly detects the temperature of the engine exhaust in the outlet pipe and the concentration of oxynitrides; Testing signal is transferred to electronic control unit, and electronic control unit is according to the working state signal of the motor that control unit provided of temperature signal, concentration signal and motor, and control urea-spray unit is injected into the aqueous solution of urea in the urea supply unit in the outlet pipe with vaporific form; Temperature in the outlet pipe is higher; Make urea generation hydrolysis and pyrolytic reaction to generate ammonia, ammonia is mixed in the first order oxynitrides catalyst converter of catalytic reduction reaction unit with the tail gas that includes oxynitrides; Catalyzer in the first order oxynitrides catalyst converter reduces the activation energy of oxynitrides reduction reaction; Improve reaction efficiency, nitrogen that in first order oxynitrides catalyst converter, generates and the oxynitrides that has neither part nor lot in reaction and ammonia get into second level oxynitrides catalyst converter, carry out catalytic reduction reaction further.Can find out; The device of the discharge amount of reduction motor oxynitrides provided by the present invention; Owing to adopted the two-stage catalyst converter, on the basis that obtains identical catalytic effect, the volume of the catalyst converter of the volume of the volume of first order oxynitrides catalyst converter and second level oxynitrides catalyst converter when the one-level catalyst converter only is set is compared all less; Thereby when turning round when engine cold-start or under worst cold case; The temperature of first order oxynitrides catalyst converter can raise quickly, has guaranteed the needed temperature of oxynitrides and ammonia gas react, thereby can obtain higher conversion ratio; When motor turns round in other cases; Mixed gas at first passes through first order oxynitrides catalyst converter; Carry out catalytic reduction reaction, through oxynitrides and the ammonia of reaction and the nitrogen entering second level oxynitrides catalyst converter that in first order oxynitrides catalyst converter, generates.Simultaneously; First order oxynitrides catalyst converter also can discharge the ammonia of wherein storing; Increase the ammonia amount that gets into second level oxynitrides catalyst converter; Carry out catalytic reduction reaction further, improved the transformation efficiency of oxynitrides, avoided causing the generation of the situation of ammonia leakage owing to the more urea of injection.
The beneficial effect of motor provided by the present invention is similar with the beneficial effect of the device of the discharge amount that reduces the motor oxynitrides, repeats no more at this.
Description of drawings
Fig. 1 is the structural representation of a kind of device of the discharge amount that reduces the motor oxynitrides in the existing technology;
The structural representation of the device of the discharge amount of motor that Fig. 2 is provided for a kind of embodiment of the present invention and reduction motor oxynitrides thereof.
Embodiment
Core of the present invention provides a kind of device that reduces the discharge amount of motor oxynitrides, and this device can obtain oxynitrides conversion efficiency higher under all operating modes in the leakage that guarantees lower ammonia.Another core of the present invention provides a kind of motor of device of the discharge amount that comprises above-mentioned reduction motor oxynitrides.
In order to make those skilled in the art person understand the present invention program better, the present invention is done further detailed description below in conjunction with accompanying drawing and embodiment.
Please refer to Fig. 2, the structural representation of the device of the discharge amount of motor that Fig. 2 is provided for a kind of embodiment of the present invention and reduction motor oxynitrides thereof.
As shown in Figure 2; In a kind of embodiment, the device of the discharge amount of reduction motor oxynitrides provided by the present invention comprises detection device (not shown), electronic control unit 24, urea supply unit 23, urea-spray unit 21 and catalytic reduction reaction unit 25; Wherein, The concentration of oxynitrides obtains testing signal in the temperature of the outlet pipe 116 of detection device detection of engine 11 and the outlet pipe 116, and its output terminal is connected with electronic control unit 24; Testing signal is transferred to electronic control unit 24; Electronic control unit 24 is connected with urea-spray unit 21 with urea supply unit 23, and cooperatively interacts with the control unit 22 of motor 11, and control urea-spray unit 21 sprays the urea of appropriate amount in outlet pipe 116 at reasonable time; Urea supply unit 23 is connected with urea-spray unit 21; Become the urea source of urea-spray unit 21, the arrangement of nozzles of urea-spray unit 21 on the outlet pipe 116 of motor 11, thereby in the outlet pipe 116 with the urea-spray in the urea supply unit 21 to motor 11; Make urea under high temperature condition, produce the reducing agent ammonia; Catalytic reduction reaction unit 25 is arranged in the outlet pipe 116 at nozzle rear, and to reduce the needed reaction temperature of catalytic reduction reaction of oxynitrides and ammonia, catalytic reduction reaction unit 25 specifically comprises the first order oxynitrides catalyst converter 251 and second level oxynitrides catalyst converter 252 that sets gradually along outlet pipe 116.
Particularly; The output terminal of detection device as herein described is connected with electronic control unit 24, electronic control unit 24 is connected with urea supply unit 23 and electronic control unit 24 to be connected with urea-spray unit 21 all both can be wired connection (promptly through electric wiring connect); Also can be wireless connections, as long as can guarantee the transmission of testing signal or control signal; The control unit 22 of electronic control unit 24 and motor cooperatively interacts and is meant; Electronic control unit 24 obtains the signals such as period of exhaust of each cylinder 114 of work operating mode and the motor of motor from the control unit 22 of motor; So that electronic control unit 24 can be judged better, and then send control command.
Detect temperature and the concentration of oxynitrides in the outlet pipe 116 for ease; Detection device specifically can comprise exhaust gas temperature sensor and oxynitrides sensor; Wherein exhaust gas temperature sensor detects the temperature in the outlet pipe 116; The concentration of the oxynitrides in the oxynitrides sensor motor exhaust is for the control of electronic control unit 24 provides basic foundation, certainly; Also be preset with control strategy in the electronic control unit 24, can send control command more accurately according to resulting testing signal.
In a kind of embodiment, urea supply unit 23 can comprise urea box and urea pump, and the inlet of urea pump is connected with urea box through pipeline, and its outlet is connected with the urea-spray unit through pipeline; Thereby urea pump can be delivered to the urea pump in the urea box in the pipeline with urea-spray unit 21; And keep certain pressure; When the nozzle of electronic control unit 24 control urea-spray unit 21 was opened, urea can be with fast speeds in the outlet pipe 116 of nozzle ejection to motor 11.
Because urea is the meeting crystallization under the condition of low temperature, thereby influence the injection of urea-spray unit 21, therefore; The urea supply unit further comprises heating module; Heating module be arranged at urea box around, the urea with in the heating urea case as required makes it keep amorphous state.
In the working procedure; Detection device (being specially exhaust gas temperature sensor and oxynitrides sensor) constantly detects the temperature of the engine exhaust in the outlet pipe 116 and the concentration of oxynitrides; Testing signal is transferred to electronic control unit 24; The working state signal of the motor 11 that electronic control unit 24 is provided according to the control unit 22 of temperature signal, concentration signal and motor 11; Control urea-spray unit 21 is injected into the aqueous solution of urea in the urea supply unit 23 in the exhaust 116 with vaporific form; Temperature in the outlet pipe 116 is higher, makes urea generation hydrolysis and pyrolytic reaction generate the reducing agent ammonia, and ammonia is mixed in the first order oxynitrides catalyst converter 251 of catalytic reduction reaction unit 25 with the tail gas that includes oxynitrides; Catalyzer in the first order oxynitrides catalyst converter 251 reduces the activation energy of oxynitrides reduction reaction; Improve reaction efficiency, the nitrogen that in first order oxynitrides catalyst converter 251, generates and the oxynitrides and the ammonia entering second level oxynitrides catalyst converter 252 that have neither part nor lot in reaction carry out catalytic reduction reaction further.
Can find out; The device of the discharge amount of reduction motor oxynitrides provided by the present invention; Owing to adopted the two-stage catalyst converter, on the basis that obtains identical catalytic effect, the volume of the catalyst converter of the volume of the volume of first order oxynitrides catalyst converter 251 and second level oxynitrides catalyst converter 252 when the one-level catalyst converter only is set is compared all less; Thereby when turning round when engine cold-start or under worst cold case; The temperature of first order oxynitrides catalyst converter 251 can raise quickly, has guaranteed the needed temperature of oxynitrides and ammonia gas react, thereby can obtain higher conversion ratio; When motor turns round in other cases; Mixed gas at first passes through first order oxynitrides catalyst converter 251; Under its catalysis, carry out catalytic reduction reaction, do not get into second level oxynitrides catalyst converter 252 through the oxynitrides of reaction and the nitrogen of ammonia and generation in first order oxynitrides catalyst converter 251, first order oxynitrides catalyst converter 251 also can discharge the ammonia of wherein storing; Increase the ammonia amount that gets into second level oxynitrides catalyst converter 252; Carry out catalytic reduction reaction further, improved the transformation efficiency of oxynitrides, avoided causing the generation of the situation of ammonia leakage owing to the more urea of injection; Certainly in low temperature and the cold start-up operating mode higher operating mode of other delivery temperature in addition, second level oxynitrides catalyst converter plays a major role.
In order to improve the transformation efficiency when engine cold-start perhaps turns round further under worst cold case; Can make first order oxynitrides catalyst converter 251 next-door neighbour's turbosupercharger; And its volume is less than the volume of second level oxynitrides catalyst converter 252; Thereby the temperature of first order oxynitrides catalyst converter 251 can raise under the effect of motor exhaust quickly, reaches the required temperature of catalytic reduction reaction takes place.
Further; For addressing the above problem; The present invention also provides a kind of motor, comprises the device of body 113 and the discharge amount that reduces the motor oxynitrides, and the device that reduces the discharge amount of motor oxynitrides is the device of the discharge amount of above-described reduction motor oxynitrides.
As shown in Figure 2; Motor comprises body 113; Be arranged at the cylinder 114 on the body 113, the intake manifold 112 and the gas exhaust manifold 115 that are communicated with the inner space of cylinder 114, intake manifold 112 all is communicated with suction tude 111; Gas exhaust manifold 115 all is communicated with outlet pipe 116, realizes the air inlet and the exhaust requirements of motor.
Further, in order to improve the air inflow of motor, motor provided by the present invention can also comprise turbosupercharger 31, and the booster turbine 311 of turbosupercharger 31 is arranged in the outlet pipe 116, and between engine body 113 and nozzle.
Because the tail gas of motor has very high energy when discharging, act on the booster turbine 311 of turbosupercharger 31, thereby can make turbosupercharger 31 work, for motor provides pressurized air.
Particularly, turbosupercharger 31 comprises booster turbine 311 and gas compressor 313, and booster turbine 311 passes through its turbine shaft 312 drive pressure mechanisms of qi 313, the inlet of gas compressor 313 and atmosphere, and its outlet is communicated with the suction tude 111 of motor.In the course of the work, booster turbine 311 turns round under the effect of motor exhaust, transfers the motion to gas compressor 313 through turbine shaft 312, and gas compressor 313 feeds the air in the atmosphere in the suction tude 111 of motor after overcompression.
Because air temperature after overcompression can rise, thereby influence the normal combustion of motor, therefore, in order to reduce compressed-air actuated temperature, can also between the suction tude 111 of the outlet of gas compressor 313 and motor 11, intercooler 12 be set.
Certainly; Motor provided by the present invention can also comprise particulate filter 41; Particulate filter 41 is arranged in the outlet pipe 116 at 25 rears, catalytic reduction reaction unit, thereby not only can reduce the discharge amount of the oxynitrides in the motor exhaust, and can reduce the discharge amount of particulate matter.
More than the device of the discharge amount of motor provided by the present invention and reduction motor oxynitrides thereof has been carried out detailed introduction.Used concrete example among this paper principle of the present invention and mode of execution are set forth, above embodiment's explanation just is used for helping to understand method of the present invention and core concept thereof.Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention, can also carry out some improvement and modification to the present invention, these improvement and modification also fall in the protection domain of claim of the present invention.
Claims (9)
1. device that reduces the discharge amount of motor oxynitrides; Comprise detection device, electronic control unit, urea supply unit, urea-spray unit and catalytic reduction reaction unit; Said detection device detects the concentration of oxynitrides in temperature and the said outlet pipe of said waste pipe; Obtain testing signal; Its output terminal is connected with said electronic control unit, and said testing signal is transferred to said electronic control unit, and said electronic control unit is connected with said urea-spray unit with said urea supply unit; And cooperate the spray regime of the said urea-spray of control unit with the control unit of said motor; Said urea supply unit is connected with said urea-spray unit, and the arrangement of nozzles of said urea-spray unit is on said waste pipe, and said catalytic reduction reaction unit is arranged in the said outlet pipe at said nozzle rear; It is characterized in that said catalytic reduction reaction unit comprises first order oxynitrides catalyst converter and the second level oxynitrides catalyst converter that sets gradually along said outlet pipe.
2. the device of the discharge amount of reduction motor oxynitrides according to claim 1 is characterized in that, said first order oxynitrides catalyst converter next-door neighbour turbosupercharger, and volume is less than the volume of said second level oxynitrides catalyst converter.
3. the device of the discharge amount of reduction motor oxynitrides according to claim 1 is characterized in that, said detection device comprises exhaust gas temperature sensor and oxynitrides sensor.
4. the device of the discharge amount of reduction motor oxynitrides according to claim 1; It is characterized in that; Said urea supply unit comprises urea box and urea pump; The inlet of said urea pump is connected with said urea box through pipeline, and its outlet is connected with said urea-spray unit through pipeline.
5. the device of the discharge amount of reduction motor oxynitrides according to claim 4 is characterized in that, said urea supply unit also comprises heating module, and said heating module is connected with said urea box.
6. motor; The device that comprises body and the discharge amount that reduces the motor oxynitrides; It is characterized in that the device of the discharge amount of said reduction motor oxynitrides is the device of the discharge amount of each described reduction motor oxynitrides of claim 1 to 5.
7. motor according to claim 6 is characterized in that, also comprises turbosupercharger, and the booster turbine of said turbosupercharger is arranged in the said outlet pipe, and between said engine body and said nozzle.
8. motor according to claim 7; It is characterized in that; Said turbosupercharger comprises said booster turbine and gas compressor; Said booster turbine drives said gas compressor through its turbine shaft, the inlet of said gas compressor and atmosphere, and its outlet is communicated with the suction tude of said motor.
9. motor according to claim 8 is characterized in that, also comprises particulate filter, and said particulate filter is arranged in the outlet pipe at rear, said catalytic reduction reaction unit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011102299743A CN102322325B (en) | 2011-08-11 | 2011-08-11 | Engine and device for reducing emission load of oxynitrides thereof |
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| CN2011102299743A CN102322325B (en) | 2011-08-11 | 2011-08-11 | Engine and device for reducing emission load of oxynitrides thereof |
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| CN102322325A true CN102322325A (en) | 2012-01-18 |
| CN102322325B CN102322325B (en) | 2013-03-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114961934A (en) * | 2022-06-15 | 2022-08-30 | 潍柴动力股份有限公司 | Engine tail gas treatment device and method |
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