CN204511606U - Motor SCR catalyst system - Google Patents
Motor SCR catalyst system Download PDFInfo
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- CN204511606U CN204511606U CN201520206802.8U CN201520206802U CN204511606U CN 204511606 U CN204511606 U CN 204511606U CN 201520206802 U CN201520206802 U CN 201520206802U CN 204511606 U CN204511606 U CN 204511606U
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- scr catalyst
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- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The utility model discloses a kind of motor SCR catalyst system.This motor SCR catalyst system comprises: engine body, and its inlet end is laid with supercharger air compressor, air inlet pipeline and engine intake manifold, and is arranged on the intake-air throttle valve on this air inlet pipeline; The exhaust end of this engine body is laid with engine exhaust pipe and charger turbine, and described engine exhaust pipe is provided with exhaust gas temperature sensor; SCR catalyst, its upstream and downstream are respectively arranged with SCR upstream and downstream temperature transducer; And bypass line, be arranged in parallel the entrance front end in described SCR catalyst, and Bidirectional bypass valve is set in the ingress of this bypass line.This motor SCR catalyst system can reduce SCR catalyst heat loss to greatest extent, improves or keep the temperature of SCR catalyst, promotes the conversion efficiency of SCR catalyst.
Description
Technical field
The utility model relates to motor and reduces NOx emission field, particularly a kind of motor SCR catalyst system.
Background technique
NO is reduced as motor
xthe important technology of discharge, SCR (selective catalytic reduction device) finds broad application on middle heavy vehicular engine.When the hardware configuration such as SCR catalyst coating, carrier are certain, can by improving its temperature and reducing the actual transformation efficiency that exhaust air speed improves SCR catalyst.
Along with the increasingly stringent of Abgasgesetz, particularly perform the city vehicle of WHTC discharge cycle, in order to discharge is guaranteed in the oil consumption that unlikely motor sacrifice is too many, the burden of SCR catalyst is also more and more heavier.But for the motor of low horsepower section and low-load in WHTC discharge cycle district, the temperature of SCR catalyst is very low, and the efficiency of SCR catalyst is also corresponding very low, is difficult to be circulated by WHTC.In order to improve row's temperature of motor, now conventional technology uses intake-air throttle valve, by reducing air inflow, slows down velocity of combustion, reaches the effect improving delivery temperature.Another effect of intake-air throttle valve is when motor towing astern, and as far as possible little close the throttle, prevents air-flow from taking away the heat of SCR catalyst.Intake-air throttle valve improves delivery temperature to a certain extent, but prevent exhaust take away SCR reprocessing heat in ability quite limited, finally make its temperature there is no lifting or the maintenance of maximum capacity.And if throttle opening is too little, form negative pressure in cylinder, can cause machine oil is gone here and there, machine oil burning can increase particle and the smoke intensity of diesel engine.
Therefore, existing technological scheme major defect is:
1, towing astern operating mode, intake-air throttle valve can not be closed completely, and some air-flow flows through SCR catalyst all the time, takes away heat; And waste gas can regard adiabatic expansion as from outlet pipe to SCR catalyst, the temperature of waste gas can reduce further.
If 2 air inlet restriction valve openings are too small, by producing very large negative pressure in intake process cylinder, crankcase engine oil is gone here and there, the machine oil of burn incompletely will cause particle and smoke intensity to increase.
3, in non-discharge region, particularly idling operation, very low and also very low relative to the SCR catalyst mean temperature TC waste gas streams of some nitrogen oxygen is through SCR catalyst, cause unnecessary heat loss, and this portion flows through SCR catalyst for a long time, ammonia reserves can be made constantly to reduce, be unfavorable for the lifting of SCR catalyst efficiency.
The information being disclosed in this background technique part is only intended to increase the understanding to general background of the present utility model, and should not be regarded as admitting or imply in any form that this information structure has been prior art that persons skilled in the art are known.
Model utility content
The purpose of this utility model is to provide a kind of simple and reasonable motor SCR catalyst system, this motor SCR catalyst system is one section of bypass line in parallel in the entrance front end of SCR catalyst, and at bypass line entrance, a Bidirectional bypass valve is installed, control the various flows path of engine exhaust, SCR catalyst heat loss can be reduced to greatest extent, improve or keep the temperature of SCR catalyst, promote the conversion efficiency of SCR catalyst, and the effulent such as smoke intensity and particle of motor can be reduced to a certain extent, thus ensure that motor is in lower emission level.
For achieving the above object, motor SCR catalyst system is provided according to the utility model, comprise: engine body, its inlet end is laid with supercharger air compressor, air inlet pipeline and engine intake manifold, and is arranged on the intake-air throttle valve on this air inlet pipeline; The exhaust end of this engine body is laid with engine exhaust pipe and charger turbine, and described engine exhaust pipe is provided with exhaust gas temperature sensor; SCR catalyst, its upstream and downstream are respectively arranged with SCR upstream and downstream temperature transducer; And bypass line, be arranged in parallel the entrance front end in described SCR catalyst, and Bidirectional bypass valve is set in the ingress of this bypass line.
Preferably, in technique scheme, supercharger air compressor is communicated with fresh air intake.
Preferably, in technique scheme, the end of SCR catalyst is provided with NO
xsensor.
Preferably, in technique scheme, the output terminal of SCR upstream and downstream temperature transducer and NO
xthe output terminal of temperature transducer is all connected with ECU.
Compared with prior art, the utility model has following beneficial effect: this motor SCR catalyst system is one section of bypass line in parallel in the entrance front end of SCR catalyst, and at bypass line entrance, a Bidirectional bypass valve is installed, control the various flows path of engine exhaust, SCR catalyst heat loss can be reduced to greatest extent, improve or keep the temperature of SCR catalyst, promote the conversion efficiency of SCR catalyst, and the effulent such as smoke intensity and particle of motor can be reduced to a certain extent, thus ensure that motor is in lower emission level.
Accompanying drawing explanation
Fig. 1 is the structural representation of motor SCR catalyst system of the present utility model.
Fig. 2 is the flow chart of motor SCR catalyst system of the present utility model.Wherein, Bidirectional bypass valve is put 1 expression waste gas and is flowed to air or next reprocessing link from bypass tube completely, Bidirectional bypass valve is put 2 expression waste gas and is flowed to air or next reprocessing link from SCR catalyst completely, △ T=delivery temperature-SCR catalyst mean temperature T
c, T1 is the temperature loss value (empirical value) of waste gas from exhaust manifold to SCR catalyst, T
c, T
dbe respectively SCR catalyst mean temperature and add blue rising and spray temperature.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in detail, but is to be understood that protection domain of the present utility model not by the restriction of embodiment.
Clearly represent unless otherwise other, otherwise in whole specification and claims, term " comprise " or its conversion as " comprising " or " including " etc. by be understood to include the element of stating or constituent element, and do not get rid of other element or other constituent element.
Improve or keep the temperature of SCR catalyst, should from the viewpoint of " increasing income " and " throttling " two, " increasing income ", namely improves delivery temperature, " throttling ", namely reduces the loss of SCR catalyst self heat.Intake-air throttle valve plays the effect of " increasing income ".If with the use of the bypass line of band Bidirectional bypass valve, then can reduce SCR catalyst heat loss to greatest extent, improve or keep the temperature of SCR catalyst, promote the conversion efficiency of SCR catalyst, and the effulent such as smoke intensity and particle of motor can be reduced to a certain extent, thus ensure that motor is in lower emission level.
As shown in Figure 1 (arrow represents airflow direction), according to specifically comprising of the motor SCR catalyst system of the utility model embodiment: engine body 14, engine exhaust pipe 1, charger turbine 8, bypass line 2, Bidirectional bypass valve 3, exhaust gas temperature sensor 4, SCR catalyst 5, supercharger air compressor 9, air inlet pipeline 10 and engine intake manifold 13, and NO
xsensor 6, SCR upstream and downstream temperature transducer 7, intake-air throttle valve 12.Wherein, fresh air intake 10 is communicated with supercharger air compressor 9, and intake-air throttle valve 12 is arranged on air inlet pipeline 11.Charger turbine 8, bypass line 2, Bidirectional bypass valve 3, SCR catalyst 5 are arranged on the exhaust end of this engine body 13, bypass line 2 is connected in parallel on the entrance front end of SCR catalyst 5, Bidirectional bypass valve 3 is arranged on the ingress of bypass line 2, and the outlet of bypass line 2 is connected with other preprocessors or air.NO
xsensor 6 is arranged on the end of SCR catalyst 5, for measuring final NO
xvalue.SCR upstream and downstream temperature transducer 7 is separately positioned on the upstream and downstream of SCR catalyst 5, and for measuring the upstream and downstream temperature of SCR catalyst, the ingress that Bidirectional bypass valve 3 is arranged on bypass line 2 can control the various flows path of engine exhaust.Exhaust gas temperature sensor 4 is arranged on engine exhaust pipe 1, for measuring the delivery temperature of engine exhaust pipe.
ECU gathers the measured value of SCR catalyst upstream and downstream temperature transducer, and the mean value T of SCR catalyst upstream and downstream temperature that will calculate
cthe outlet air temperature gathered with exhaust gas temperature sensor 4 compares, according to comparative result, with the operating mode that motor runs, determine that the action of Bidirectional bypass valve door is enable by the control strategy of this motion, when motor is in towing astern operating mode, Bidirectional bypass valve instruction waste gas is discharged to air or next reprocessing link through bypass line, and the action of other operating mode Bidirectional bypass valves then needs to realize according to control strategy below.SCR catalyst heat loss can be reduced to greatest extent, improve or keep the temperature of SCR catalyst, promote the conversion efficiency of SCR catalyst, and the effulents such as the smoke intensity of motor and particle can be reduced to a certain extent, thus ensure that motor is in lower emission level.Can prevent motor under towing astern operating mode, machine oil being gone here and there, cause the smoke intensity of next work cycle and particle to increase, when meanwhile can also effectively prevent motor to be in towing astern operating mode, a large amount of cool airs takes away the heat of catalyst converter.Can prevent when catalyst converter mean temperature is higher than the long idling operation in non-discharge region, particularly city vehicle during delivery temperature, catalyst temperature is by the exhaust blast-cold under such operating mode, and the ammonia storage that can be prevented to circulate is diluted by waste gas streams.Can also prevent motor from operating in some unnecessary heat losss of discharge region catalyst converter, namely prevent nitrogen oxygen value lower than target control value, and delivery temperature take away heat lower than the waste gas streams of catalyst converter mean temperature through catalyst converter.Native system, while raising catalyst temperature and catalyst converter efficiency, can reduce urea injecting quantity, reduces NH_3 leakage, reduces the risk of urea crystals; Suitably can also increase the NO of motor
xformer row's value, improves the fuel economy of motor.
As shown in Figure 2:
Describe in detail with regard to its working procedure below.(△ T=delivery temperature-SCR catalyst mean temperature T
c)
Illustrate one: when motor is in towing astern operating mode, ECU detects that current circulation oil mass is 0, and now, ECU sends instruction, intake-air throttle valve standard-sized sheet, avoids forming negative pressure in cylinder, avoids machine oil is gone here and there; Bidirectional bypass valve instruction waste gas is discharged to air or next reprocessing link through bypass line, avoids air-flow to take away the heat of SCR catalyst.
Illustrate two: when △ T≤0 DEG C, and motor is in idling, intake-air throttle valve keeps original aperture.△ T < 0, namely delivery temperature is than actual SCR catalyst mean temperature T
calso low, if now exhaust flows through SCR catalyst again, its temperature must be caused to reduce; △ T=0, namely SCR catalyst mean temperature is equal with delivery temperature TC, because consider pipeline thermal loss and adiabatic expansion, actual exhaust air temperature should deduct thermal loss temperature T1, and waste gas can not play the effect of heating SCR catalyst; Because motor is in idling (or other non-discharge region) NO
xthe discharge of former machine lower than control objectives, appeal two kinds of situation Bidirectional bypass valves all instruction waste gas be discharged to air or next reprocessing link through bypass line, the temperature of maintenance SCR catalyst.
Illustrate three: when △ T≤0 DEG C, and motor is in non-idling and towing astern operating mode, intake-air throttle valve keeps original aperture.Now delivery temperature is than actual SCR catalyst mean temperature T
clow, motor is in discharge areas, if NO
xdischarge is lower than target control value, or Bidirectional bypass valve instruction waste gas is discharged to the next reprocessing link of air through bypass line; If NO
xformer machine discharge is higher than target control value, and the mean temperature T of SCR catalyst
ctemperature T is sprayed higher than adding blue rising
d, then Bidirectional bypass valve instruction waste gas streams reduces NO through SCR catalyst
xdischarge; If but SCR mean temperature T
ctemperature T is sprayed lower than adding blue rising
deven if at this moment exhaust is by SCR catalyst, and catalytic efficiency is also very low, also can further blast-cold SCR catalyst, in order to keep catalyst converter to have higher temperature, and prevent ammonia from storing reduction, Bidirectional bypass valve instruction waste gas is discharged to air or next reprocessing link through bypass line.
Illustrate four: as △ T > 0 DEG C, namely delivery temperature is greater than SCR catalyst mean temperature T
ctime, intake-air throttle valve keeps original aperture; Because considered pipeline thermal loss and adiabatic expansion, actual exhaust air temperature should deduct thermal loss temperature T1.If △ T – is T1>0, no matter which kind of operating mode motor is in, and Bidirectional bypass valve instruction waste gas all flows through SCR catalyst; If △ T – is T1<0, and NO
xformer machine discharge is lower than target control value, and Bidirectional bypass valve instruction waste gas is discharged to air or next reprocessing link through bypass line; If △ T – is T1<0, and NO
xformer machine discharge is higher than target control value, and the mean temperature T of SCR catalyst
ctemperature T is sprayed higher than adding blue rising
d, then Bidirectional bypass valve instruction waste gas streams reduces NO through SCR catalyst
xdischarge, otherwise Bidirectional bypass valve instruction waste gas is discharged to air or next reprocessing link through bypass line.
Under a core point of this motion control strategy is that defining motor is in different operating mode, the action of Bidirectional bypass valve and corresponding intake-air throttle valve opening and closing degree; Another core point is by comparing delivery temperature and SCR catalyst mean temperature TC, comparison engine NO
xthe discharge of former machine and control objectives value, compare SCR catalyst mean temperature TC and add blue rising and spray a series of that temperature sets up and be beneficial to the effective measures improving or keep SCR catalyst.
To sum up, this motor SCR catalyst system is one section of bypass line in parallel in the entrance front end of SCR catalyst, and at bypass line entrance, a Bidirectional bypass valve is installed, control the various flows path of engine exhaust, SCR catalyst heat loss can be reduced to greatest extent, improve or keep the temperature of SCR catalyst, promote the conversion efficiency of SCR catalyst, and the effulent such as smoke intensity and particle of motor can be reduced to a certain extent, thus ensure that motor is in lower emission level.
The aforementioned description to concrete exemplary of the present utility model is to illustrate and the object of illustration.These descriptions not want the utility model to be defined as disclosed precise forms, and obviously, according to above-mentioned instruction, can much change and change.The object selected exemplary embodiment and describe is to explain certain principles of the present utility model and practical application thereof, thus those skilled in the art can be realized and utilize various different exemplary of the present utility model and various different selection and change.Scope of the present utility model is intended to limited by claims and equivalents thereof.
Claims (4)
1. a motor SCR catalyst system, is characterized in that, comprising:
Engine body, its inlet end is laid with supercharger air compressor, air inlet pipeline and engine intake manifold, and is arranged on the intake-air throttle valve on this air inlet pipeline; The exhaust end of this engine body is laid with engine exhaust pipe and charger turbine, and described engine exhaust pipe is provided with exhaust gas temperature sensor;
SCR catalyst, its upstream and downstream are respectively arranged with SCR upstream and downstream temperature transducer; And
Bypass line, is arranged in parallel the entrance front end in described SCR catalyst, and arranges Bidirectional bypass valve in the ingress of this bypass line.
2. motor SCR catalyst system according to claim 1, it is characterized in that, described supercharger air compressor is communicated with fresh air intake.
3. motor SCR catalyst system according to claim 1, it is characterized in that, the end of described SCR catalyst is provided with NO
xsensor.
4. motor SCR catalyst system according to claim 3, is characterized in that, the output terminal of described SCR upstream and downstream temperature transducer and NO
xthe output terminal of sensor is all connected with ECU.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520206802.8U CN204511606U (en) | 2015-04-08 | 2015-04-08 | Motor SCR catalyst system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520206802.8U CN204511606U (en) | 2015-04-08 | 2015-04-08 | Motor SCR catalyst system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204511606U true CN204511606U (en) | 2015-07-29 |
Family
ID=53709595
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520206802.8U Expired - Fee Related CN204511606U (en) | 2015-04-08 | 2015-04-08 | Motor SCR catalyst system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204511606U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104775881A (en) * | 2015-04-08 | 2015-07-15 | 广西玉柴机器股份有限公司 | Engine SCR (Selective Catalytic Reduction) catalyst system and control method thereof |
| CN111425286A (en) * | 2020-03-31 | 2020-07-17 | 广西玉柴机器股份有限公司 | Method and system for controlling tail gas emission of gas engine |
-
2015
- 2015-04-08 CN CN201520206802.8U patent/CN204511606U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104775881A (en) * | 2015-04-08 | 2015-07-15 | 广西玉柴机器股份有限公司 | Engine SCR (Selective Catalytic Reduction) catalyst system and control method thereof |
| CN104775881B (en) * | 2015-04-08 | 2017-05-31 | 广西玉柴机器股份有限公司 | The control method of engine SCR catalyst system |
| CN111425286A (en) * | 2020-03-31 | 2020-07-17 | 广西玉柴机器股份有限公司 | Method and system for controlling tail gas emission of gas engine |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150729 |