CN103939189A - Dry method ammonia producing and metering injection system with ammonium bicarbonate heated with engine waste heat - Google Patents
Dry method ammonia producing and metering injection system with ammonium bicarbonate heated with engine waste heat Download PDFInfo
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- CN103939189A CN103939189A CN201410191145.4A CN201410191145A CN103939189A CN 103939189 A CN103939189 A CN 103939189A CN 201410191145 A CN201410191145 A CN 201410191145A CN 103939189 A CN103939189 A CN 103939189A
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- ammonia
- ammonium bicarbonate
- injection system
- pipe
- dry method
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention relates to a dry method ammonia producing and metering injection system with ammonium bicarbonate heated with engine waste heat, and belongs to the technical field of engine SCRs. The dry method ammonia producing and metering injection system comprises an SCR postprocessor (1), a control unit (2), an ammonia gas generator (3), ammonia gas generator pressure, a temperature sensor (4), a feeding opening (5), a heating coil (6), an electronic control switch valve (7), a flow control valve (8), an ammonia gas nozzle (9) and an ammonia conveying pipe (10). Ammonium bicarbonate solids are heated with the engine waste heat in the ammonia gas generator (3) to be resolved to release mixed gas of ammonia gas, steam and carbon dioxide. The mixed gas is metered through the flow control valve (8) and sprayed into an engine exhaust pipe, and NOx is reduced into N2 through the ammonia gas under the effect of catalysts. Ammonium bicarbonate is conveniently and safely transported and stored, and the economical efficiency of the ammonium bicarbonate is superior to the economical efficiency of urea reducing agents. The ammonia gas preparing and metering injection system of an engine SCR system is low in cost and good in safety.
Description
Technical field
The invention belongs to I. C. engine exhaust SCR purification system technique field.Be particularly related to a kind of ammonium bicarbonate dry method ammonia processed and metering injection system that utilizes engine exhaust heat heating.
Background technique
The flue gas that motor gives off contains NOx serious environment pollution.The environmental regulation of increasingly stringent requires cluster engine must configure Exhaust gas purifying device.Conventional engine exhaust post-processing technology is generally that a certain amount of urea liquid is sprayed in engine exhaust pipe, and release ammonia is decomposed in urea atomization in engine exhaust pipe.Under the effect of catalyzer, NOx is reduced into N by ammonia
2.
SCR, refers to selective catalytic reduction; SCR reacts using ammonia as reducing agent, in the exhaust passageway of motor, configure SCR catalyzer, by supplying with ammonia to SCR catalyzer, make the NOx(nitrogen oxide in ammonia and exhaust) generation reduction generation, form water vapour (H2O) and nitrogen (N2), thereby can effectively reduce diesel engine NO
xdischarge, purified exhaust.For ammonia is supplied with to SCR catalyzer, conventionally in exhaust passageway, supply with the easier urea water of processing compared with ammonia, therefore need to use urea water injection device by aqueous solution of urea process finer atomization metered injection intake and exhaust pipeline, make vaporific urea water utilize the heat of exhaust to decompose and generate ammonia, thereby the ammonia of generation is adsorbed on SCR catalyzer, makes NOx and ammonia react resolve into water vapour (H2O) and nitrogen (N2) and discharge.How in outlet pipe, spraying the core technology that quantitative wellatomized urea liquid is SCR system, current technology generally adopts metering pump to pressurize to urea liquid.Owing to all need to being powered to this metering pump by storage battery in automobile and other car and boat, and metering pump needs elevated pressures, is beneficial to the atomization of urea, has therefore strengthened the loss of storage battery electric energy; Meanwhile, metering pump is mainly controlled by external producer at present, can't realize domestic, and price is more expensive, and metering pump belongs to precision equipment, is also one of the easiest out of order equipment in SCR system, after being out of order, can only change, therefore equipment later maintenance upkeep cost is also very high.
Under carbonic hydroammonium normal temperature and pressure, exist with solid-state, ammonium hydrogencarbonate store and transport aspect there is not safety problem, compared with urea, carbonic hydroammonium low price, decomposition temperature is low, system economy is better.Therefore, consider from Security and Economy angle, carbonic hydroammonium is suitable as the reducing agent of diesel SCR exhaust after treatment system.
Summary of the invention
The object of the invention is to needs metering pump to make cost higher or make the problems such as storage battery energy consumption Stability and veracity too high and urea solution jet amount is poor for existing SCR reaction reductant metering ejecting system, and a kind of ammonium bicarbonate dry method ammonia processed and metering injection system for SCR reaction is provided.
For achieving the above object, by utilizing engine exhaust heat heating to make carbonic hydroammonium solid decomposite ammonia, water vapour, carbon dioxide mix gas, rely on control unit and one group of gas flow control valve, realize the metering of ammonia and carry and import easily SCR after-treatment system, realize dispelling NOx; This system has been save the parts such as transfer pump, thermo-insulating pipe line, filter, level meter and the urea nozzle of the liquid area reducing agent of traditional liquid SCR system, and simplification system improves reliability, in addition, also significantly reduces costs.
Technological scheme of the present invention is achieved in that the ammonium bicarbonate dry method ammonia processed and the metering injection system that utilize engine exhaust heat heating, by SCR preprocessor, control unit, the anti-raw device of ammonia, ammonia generator pressure, temperature transducer, charging hole, heating coil, electrically switchable grating valve, flow control valve, ammonia nozzle, defeated ammonia pipe composition, it is characterized in that: ammonia generator is the reservoir vessel of carbonic hydroammonium solid, also be the reactor of the decomposition reaction of carbonic hydroammonium, loading is 40% of ammonia generator volume, on ammonia generator, be provided with heating coil, pressure, temperature transducer, charging hole.Pressure, the induction end of temperature transducer is positioned at ammonia generator inside but does not contact carbonic hydroammonium solid, on ammonia generator, there is pipe valve for subsequent use, on the defeated ammonia pipeline being connected with outlet pipe, there is flow control valve, the ammonia nozzle of defeated ammonia pipe end is arranged on waste pipe, on engine exhaust pipe, there is SCR preprocessor, SCR preprocessor exhaust port side connects exhaust pipe, in tail gas suction tude, there is offgas duct temperature transducer, NOx sensor, the induction end of offgas duct temperature transducer and NOx sensor is positioned at tail gas suction tude pipe, heating coil is arranged in the carbonic hydroammonium solid material of ammonia generator inside, ammonia generator pressure, temperature transducer, offgas duct temperature transducer, NOx sensor is by the signal receiving end of signaling line connection control unit, and the control end of control unit is by power signal line connection traffic control valve, electrically switchable grating valve.
Described defeated ammonia pipe and engine exhaust pipe are arranged in parallel to utilize outlet pipe companion heat, to avoid the raw reverse reaction of ammonia and carbon dioxide occurs at low temperatures to generate carbaminate blocking pipe.
Described flow control valve can be gas or steam Proportional valve, throttle valve, gas nozzle.This flow control valve is the flow control device that can accurately control mixed gas.
Described reducing agent can be carbonic hydroammonium, also can replace with the reducing agent that mixes of the double salt of carbonic hydroammonium with the double salt of carbonic hydroammonium or carbonic hydroammonium.
The described ammonium bicarbonate dry method ammonia processed of engine exhaust heat heating and the job step of metering injection system utilized is: ammonium hydrogencarbonate solid is added to ammonia generator, in ammonia generator, utilize the heating coil of engine exhaust heat to heat carbonic hydroammonium, carbonic hydroammonium high-temperature heating is decomposed into ammonia, carbon dioxide and water vapour mixed gas; Mixed gas enters engine exhaust pipe through flow control valve and ammonia nozzle subsequently, mixes, and under catalyst action, in SCR preprocessor, NOx is reduced to N in outlet pipe with engine exhaust
2.
Beneficial effect of the present invention is:
1. the present invention adopts carbonic hydroammonium as reducing agent, because carbonic hydroammonium is nontoxic, and is heated and easily decomposes, and ammonia-preparing process is easily controlled, and ammonia generating rate is stable.Transport stores convenient and safe.System operation is fool proof.
2. the present invention adopts carbonic hydroammonium as reducing agent, reacts required ammonia amount conversion by SCR, and it is more cheap than adopting urea that reducing agent adopts carbonic hydroammonium, good economy performance.Carbonic hydroammonium oxygen content is 21. 5%, and urea oxygen content is 56.7%.The average price of domestic carbonic hydroammonium is about 480 yuan/ton of left and right, and the average selling price of urea is 1800 yuan/ton of left and right.1 kilogram of ammonia of every generation, adopts bicarbonate to connect as reducing agent, need to spend 2.23 yuan; And adopt urea as reducing agent, need to spend 3.17 yuan.Obviously, carbonic hydroammonium is more more economical than urea as reducing agent.
3, the present invention adopts gas or flow adjusting valve for steam control to spray into the amount of the reducing agent ammonia in engine exhaust pipe, do not need to manufacture accurate and expensive urea solution metering pump, thereby can reduce widely product cost and maintenance cost, break away from the dependence to imported product; Simultaneously owing to adopting gas flow control valve metering to spray into the ammonia amount in outlet pipe, measuring accuracy is very high, low price can domesticize, equipment and technology maturation, with low cost, all devices all can be selected production domesticization equipment, easily relies on Domestic Resources to realize industrial applications, is conducive to large-scale promotion and application.
4. the mixed gas that carbonic hydroammonium decomposes adopts gaseous state to spray into engine exhaust pipe, thereby more easily evenly mixes with the waste gas of outlet pipe, is conducive to the carrying out of reaction, and can have the problems such as urea liquid crystallization and obstruction.
Brief description of the drawings
Fig. 1 is described ammonium bicarbonate dry method ammonia processed and the metering injection system structural representation that utilizes engine exhaust heat heating.
Number in the figure: 1:SCR preprocessor, 2: control unit, 3: the anti-raw device, 4 of ammonia: ammonia generator pressure, temperature transducer, 5: charging hole, 6: heating coil, 7: electrically switchable grating valve, 8: flow control valve, 9: ammonia nozzle, 10: defeated ammonia pipe.
Embodiment
The invention provides a kind of ammonium bicarbonate dry method ammonia processed and metering injection system that utilizes engine exhaust heat heating, below in conjunction with brief description of the drawings and embodiment, the present invention is described in further detail.
As shown in Figure 1, utilize engine exhaust heat heating ammonium bicarbonate dry method ammonia processed and metering injection system, comprise 1:SCR preprocessor, 2: control unit, 3: the anti-raw device, 4 of ammonia: ammonia generator pressure, temperature transducer, 5: charging hole, 6: heating coil, 7: electrically switchable grating valve, 8: flow control valve, 9: ammonia nozzle, 10: defeated ammonia pipe.
Described carbonic hydroammonium is stored in ammonia generator, and the heating coil that carbonic hydroammonium is utilized engine exhaust heat in ammonia generator adds thermolysis generation ammonia, carbon dioxide, water vapour mixed gas; On ammonia generator 2, be provided with ammonia generator pressure, temperature transducer 4, described ammonia generator pressure, temperature transducer 4 are electrically connected with controller 2 or vehicle-mounted ECU, and the temperature of anti-ammonia generator 3 and pressure and other parameters are all fed back to control unit 2 or vehicle-mounted ECU by ammonia generator pressure, temperature transducer 4.Ammonia generator 3 utilizes introduces engine exhaust, or cooling water, or the heating coil 6 of engine high-temperature air inlet after air-admission pressure-booster heats, whether whether heating coil 6 control heating by the introducing of the 7 control engine exhausts of electrically switchable grating valve or cooling water, and the switch of electrically switchable grating valve 7 is by ECU (Electrical Control Unit) 2 or vehicle-mounted ECU control.Its objective is as the carbonic hydroammonium in ammonia generator 3 reacts heat is provided.Ammonia generator 3 is connected with ammonia nozzle 9 by defeated ammonia pipe 10, on described defeated ammonia pipe 10, flow control valve 8 is set; Described flow control valve 8 is electrically connected with control unit 2 or vehicle-mounted ECU, thereby the unlatching of control unit 2 or vehicle-mounted ECU control flow control valve 8 size is controlled the quantity delivered of ammonia, carbon dioxide and steam mixture, realize thus flow control valve 8 and accurately control and spray into outlet pipe air-fuel mixture amount.SCR preprocessor 1 is arranged on ammonia nozzle 9 downstreams, is mainly made up of carrier and catalyzer, and its effect is under the effect of catalyzer, and the ammonia gas react of the NOx in engine exhaust and injection is generated to harmless nitrogen G&W, reaches NO in reduction, purifying exhaust gas
xeffect.
Referring to Fig. 1, working procedure specifically comprises as follows: one, startup system: when engine start, this ammonium bicarbonate dry method ammonia processed and metering injection system that is used for motor SCR will start, control unit 2 is by ammonia generator pressure, temperature transducer 4 detects the temperature and pressure parameter in ammonia generator 3, when the pressure drop of ammonia generator 3 is during to the working pressure minimum value of flow control valve 8, control unit 2 sends instruction unpack electrically switchable grating valve 7, in heating coil, introduce engine exhaust, or cooling water, or engine high-temperature air inlet after air-admission pressure-booster is with heating ammonia generator 3, make a part of carbonic hydroammonium in ammonia generator 3 decompose and improve the pressure of ammonia generation, in the time that the working pressure of ammonia generator 3 reaches the working pressure maximum value of flow control valve 8, control unit 2 sends instruction and closes electrically switchable grating valve 7 and heat to ammonia generator stopping, when flow control valve 8 herein ensures normal metering gas, it has a range of working pressure conventionally, in this range of working pressure, flow control valve 8 can be realized correct function of measuring, and the maximum value of flow control valve 8 working pressures and minimum value are determined by its design.Two, carbonic hydroammonium solid decomposes: carbonic hydroammonium solid is decomposed into ammonia, carbon dioxide and water vapour mixed gas in ammonia generator 3 under the effect of electric heater heating, and mixed gas makes ammonia generator 3 pressure be elevated to the range of working pressure of flow control valve 8.Three, ammonia sprays: when ammonia generator 3 pressure are elevated to after the range of working pressure of flow control valve 8, the mixed gas of ammonia, carbon dioxide and water vapour is transported to ammonia nozzle 9 by defeated ammonia pipe 10, then the mixed gas of ammonia and water vapour is sprayed in outlet pipe, flow control valve 8 sprays into the amount in outlet pipe according to control unit 2 or vehicle-mounted ECU instruction accurate control ammonia, carbon dioxide and water vapour mixed gas, in SCR preprocessor 1, the ammonia in mixed gas under catalyst action by the NO in exhaust
xdischarge is reduced to nitrogen, reaches and reduces NO in exhaust
xeffect; Four, the carbonic hydroammonium solid of again annotating: in the time that system detects that ammonia generator intracellular bicarbonate ammonium solid is less, can rejoin a certain amount of carbonic hydroammonium solid by charging hole 5, carbonic hydroammonium solid can drop into ammonia generator by solid, also can be filled with ammonia generator with gaseous state; Or make system have the carbonic hydroammonium of appropriate amount, so periodic duty by the mode of the ammonia generator that more renews.In the present invention, directly in outlet pipe, spray into ammonia owing to adopting, do not need expensive accurate urea metering pump, with low cost, all devices all can be selected production domesticization equipment, is conducive to large-scale promotion and application; And ammonia more easily mixes with NOx and reacts, and NOx transformation efficiency is higher.
Above content is in conjunction with concrete preferred implementation further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, said structure all should be considered as belonging to protection scope of the present invention.
Claims (7)
1. one kind is utilized ammonium bicarbonate dry method ammonia processed and the metering injection system of engine exhaust heat heating, comprise: the anti-raw device (3) of SCR preprocessor (1), control unit (2), ammonia, ammonia generator pressure, temperature transducer (4), charging hole (5), heating coil (6), electrically switchable grating valve (7), flow control valve (8), ammonia nozzle (9), defeated ammonia pipe (10), it is characterized in that ammonia generator is the reservoir vessel of carbonic hydroammonium solid, also be the reactor of the decomposition reaction of carbonic hydroammonium, on ammonia generator, be provided with heating coil (6), pressure, temperature transducer (4), charging hole (5), the heating coil that ammonium hydrogencarbonate solid is utilized engine exhaust heat in ammonia generator adds thermolysis release ammonia, water vapour, carbon dioxide mix gas, ammonia generator (3) is connected with ammonia nozzle (9) by defeated ammonia pipe (10), on described defeated ammonia pipe (10), flow control valve (8) is set, mixed gas sprays into engine exhaust pipe by flow control valve (8) metering, under catalyst action, NOx is reduced into N by ammonia
2, described ammonia generator pressure, temperature transducer (4) and flow control valve (8), be electrically connected respectively the operation of control unit (2) or vehicle-mounted ECU control whole system with control unit (2) or vehicle-mounted ECU.
2. a kind of ammonium bicarbonate dry method ammonia processed and metering injection system that utilizes engine exhaust heat heating according to claim 1, it is characterized in that: described carbonic hydroammonium decomposition reaction institute calorific requirement can be introduced waste gas heating coil and obtain, also the engine high-temperature air inlet after engine cooling water or air-admission pressure-booster can be introduced to heating coil obtains, carbonic hydroammonium solid in heating coil heating ammonia generator is to produce ammonia, water vapour, carbon dioxide mix gas.
3. according to a kind of ammonium bicarbonate dry method ammonia processed and the metering injection system that utilizes engine exhaust heat heating described in claim 1 and 2, it is characterized in that: described introducing heating coil waste gas can be taken at waste pipe, particular location can be exhaust branch pipe, turbosupercharger front exhaust house steward, the outlet pipe between turbosupercharger and tailpipe or exhaust processor.
4. a kind of ammonium bicarbonate dry method ammonia processed and metering injection system that utilizes engine exhaust heat heating according to claim 1, it is characterized in that: described defeated ammonia pipe and engine exhaust pipe are arranged in parallel to utilize outlet pipe companion heat, to avoid the raw reverse reaction of ammonia and carbon dioxide occurs at low temperatures to generate carbaminate blocking pipe.
5. a kind of ammonium bicarbonate dry method ammonia processed and metering injection system that utilizes engine exhaust heat heating according to claim 1, is characterized in that: described flow control valve can be gas or steam Proportional valve, throttle valve, gas nozzle; This flow control valve is the flow control device that can accurately control mixed gas.
6. a kind of ammonium bicarbonate dry method ammonia processed and metering injection system that utilizes engine exhaust heat heating according to claim 1, it is characterized in that: described reducing agent can be carbonic hydroammonium, also can replace with the reducing agent that mixes of the double salt of carbonic hydroammonium with the double salt of carbonic hydroammonium or carbonic hydroammonium.
7. a kind of ammonium bicarbonate dry method ammonia processed and metering injection system that utilizes engine exhaust heat heating according to claim 1, it is characterized in that: described ammonia nozzle can be arranged on the outlet pipe before engine turbine, to utilize turbine that ammonia is fully mixed with exhaust, also can be arranged on the outlet pipe or SCR reprocessing after turbine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410191145.4A CN103939189A (en) | 2014-05-08 | 2014-05-08 | Dry method ammonia producing and metering injection system with ammonium bicarbonate heated with engine waste heat |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410191145.4A CN103939189A (en) | 2014-05-08 | 2014-05-08 | Dry method ammonia producing and metering injection system with ammonium bicarbonate heated with engine waste heat |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104100339A (en) * | 2014-07-24 | 2014-10-15 | 吉林省众鑫汽车装备有限公司 | Ammonia electronic-controlled injection device and method |
| CN104100337A (en) * | 2014-07-24 | 2014-10-15 | 吉林省众鑫汽车装备有限公司 | Selective catalytic reduction system of solid reductant |
| CN106495184A (en) * | 2016-12-28 | 2017-03-15 | 宁波立达智能控制技术有限公司 | Solid-state ammonium SCR system ammonia generating means |
| CN106703949A (en) * | 2017-01-18 | 2017-05-24 | 吉林省众鑫汽车装备有限公司 | Ammonia storage system and vehicle with system |
| CN108301939A (en) * | 2018-03-28 | 2018-07-20 | 东风商用车有限公司 | It is a kind of to utilize engine exhaust and cooling water heating storage ammonia and ammonia metering injection system |
| CN109899137A (en) * | 2019-04-12 | 2019-06-18 | 无锡威孚力达催化净化器有限责任公司 | A kind of SCR system removes the control method and device of urea crystals |
| CN111622828A (en) * | 2020-05-26 | 2020-09-04 | 宁波楷世环保科技有限公司 | Ammonia gas generation metering injection device |
| CN111622829A (en) * | 2020-05-26 | 2020-09-04 | 宁波楷世环保科技有限公司 | Injection rate control system of ammonia gas generation metering injection device |
-
2014
- 2014-05-08 CN CN201410191145.4A patent/CN103939189A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104100339A (en) * | 2014-07-24 | 2014-10-15 | 吉林省众鑫汽车装备有限公司 | Ammonia electronic-controlled injection device and method |
| CN104100337A (en) * | 2014-07-24 | 2014-10-15 | 吉林省众鑫汽车装备有限公司 | Selective catalytic reduction system of solid reductant |
| CN106495184A (en) * | 2016-12-28 | 2017-03-15 | 宁波立达智能控制技术有限公司 | Solid-state ammonium SCR system ammonia generating means |
| CN106703949A (en) * | 2017-01-18 | 2017-05-24 | 吉林省众鑫汽车装备有限公司 | Ammonia storage system and vehicle with system |
| CN108301939A (en) * | 2018-03-28 | 2018-07-20 | 东风商用车有限公司 | It is a kind of to utilize engine exhaust and cooling water heating storage ammonia and ammonia metering injection system |
| CN108301939B (en) * | 2018-03-28 | 2023-09-01 | 东风商用车有限公司 | Ammonia storage and metering injection system by using engine exhaust and cooling water for heating |
| CN109899137A (en) * | 2019-04-12 | 2019-06-18 | 无锡威孚力达催化净化器有限责任公司 | A kind of SCR system removes the control method and device of urea crystals |
| CN109899137B (en) * | 2019-04-12 | 2023-12-01 | 无锡威孚力达催化净化器有限责任公司 | Control method and device for removing urea crystals by SCR system |
| CN111622828A (en) * | 2020-05-26 | 2020-09-04 | 宁波楷世环保科技有限公司 | Ammonia gas generation metering injection device |
| CN111622829A (en) * | 2020-05-26 | 2020-09-04 | 宁波楷世环保科技有限公司 | Injection rate control system of ammonia gas generation metering injection device |
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Application publication date: 20140723 |
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