CN103511041A - System for preparing ammonia through ammonium bicarbonate according to wet method and conducting injection in measured mode and for engine SCR - Google Patents
System for preparing ammonia through ammonium bicarbonate according to wet method and conducting injection in measured mode and for engine SCR Download PDFInfo
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- CN103511041A CN103511041A CN201310486881.8A CN201310486881A CN103511041A CN 103511041 A CN103511041 A CN 103511041A CN 201310486881 A CN201310486881 A CN 201310486881A CN 103511041 A CN103511041 A CN 103511041A
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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
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- 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
Abstract
The invention relates to a system for preparing ammonia through ammonium bicarbonate according to a wet method and conducting injection in a measured mode and for an engine SCR and belongs to the technical field of the engine SCR. The system comprises an SCR postprocessor, an ammonia gas generator, a controller, an electromagnetic switch valve, an ammonium bicarbonate solution pipe, an ammonia gas generator temperature and pressure sensor, an ammonia delivery pipe, a flow control valve, and an ammonia gas nozzle. Pyrolysis is conducted on an ammonium bicarbonate solution in the ammonia gas generator so that mixed gas of ammonia gas, carbon dioxide and steam can be released. The mixed gas is injected into a gas exhaust pipe of an engine in a measured mode through the flow control valve and NOx is reduced to N2 through the ammonia gas under the action of a catalyst. According to the system for preparing the ammonia through the ammonium bicarbonate according to the wet method and conducting injection in the measured mode and for the engine SCR, the ammonium bicarbonate is delivered and stored conveniently and safely, the economical performance is better than that of a urea reducing agent, the ammonium bicarbonate serves as the reducing agent for oxygen generation through wet method pyrolysis, the use amount of the ammonium bicarbonate is easy to control, and the ammonia gas is generated stably, and the whole system is simple, efficient and simple in structure. The system for preparing the ammonia and conducting injection in the measured mode for the engine SCR is low in cost, good in safety and low in power consumption.
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 by using wet process ammonia processed and metering injection system.
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 reaction is usingd 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 convenient, ammonia is supplied with to SCR catalyzer, conventionally to supplying with in exhaust passageway to compare with ammonia, process easier urea water, therefore need to use urea water injection device by aqueous solution of urea process finer atomization quantitative 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, the loss that has therefore strengthened 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, so equipment later maintenance upkeep cost is also very high.
Under carbonic hydroammonium normal temperature and pressure, with solid-state, exist, carbonic hydroammonium, not having safety problem aspect storage and transportation, is compared with urea, carbonic hydroammonium low price, decomposition temperature is low, and in water, solubility is large, and with temperature rising solubility, increase, system economy is better.Therefore, from Security and Economy angle, consider, 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 by using wet process ammonia processed and quantitative injection system for SCR reaction is provided.
For achieving the above object, the step of described a kind of ammonium bicarbonate by using wet process ammonia processed and quantitative injection system is: 1) bicarbonate is dissolved as to ammonium bicarbonate soln, ammonium bicarbonate soln is pumped into ammonia generator by ammonium bicarbonate solution pipe, in ammonia generator, ammonium bicarbonate soln is decomposed into ammonia by high-temperature heating, 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, and because carbonic hydroammonium is nontoxic, carbonic hydroammonium is soluble in water, and is heated and easily decomposes, and ammonia-preparing process is easily controlled, and ammonia generating rate is stable.Transportation stores convenient and safe.System operation is fool proof.
2. the present invention adopts carbonic hydroammonium as reducing agent, by SCR, reacts required ammonia amount conversion, and it is more cheap than adopting urea that reducing agent adopts carbonic hydroammonium, good economy performance.Carbonic hydroammonium ammon amount is 21. 5%, and urea ammon amount 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 carbonic hydroammonium 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 to control the amount that sprays into 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 is ripe, and with low cost, all devices all can be selected production domesticization equipment, easily rely on Domestic Resources to realize industrial applications, be conducive to large-scale promotion and application.
4. the mixed gas that ammonium bicarbonate soln 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 not has the problems such as urea liquid crystallization and obstruction.
Accompanying drawing explanation
Fig. 1 is described a kind of ammonium bicarbonate by using wet process for motor SCR ammonia processed and quantitative injection system architecture schematic diagram.
Number in the figure: 1:SCR preprocessor 2: the anti-raw device of ammonia; 3: control unit; 4: electromagnetic switch valve; 5: ammonium bicarbonate solution pipe; 6: ammonia generator temperature, pressure transducer; 7: defeated ammonia pipe; 8: flow control valve; 9: ammonia nozzle.
Embodiment
The invention provides a kind of ammonium bicarbonate by using wet process for motor SCR ammonia processed and quantitative injection system, below in conjunction with accompanying drawing explanation and embodiment, the present invention is described in further detail.
A kind of ammonium bicarbonate by using wet process for motor SCR ammonia processed and quantitative injection system as shown in Figure 1, comprise 1:SCR preprocessor, 2: the anti-raw device of ammonia, 3: control unit, 4: electromagnetic switch valve, 5: ammonium bicarbonate solution pipe, 6: ammonia generator temperature, pressure transducer, 7: defeated ammonia pipe, 8: flow control valve, 9: ammonia nozzle.Described ammonium bicarbonate soln is pumped to after ammonia generator, is heated to decompose to produce ammonia, carbon dioxide, water vapour mixed gas in ammonia generator; On ammonia generator 2, be provided with temperature, pressure transducer 6, described temperature, pressure transducer 6 is electrically connected to control unit 3 or vehicle-mounted ECU, temperature, and pressure transducer 6 all feeds back to control unit 3 or vehicle-mounted ECU by the temperature of ammonia generator 2 and pressure and other parameters.On the outlet pipe of ammonia generator 2 preferred arrangements after SCR preprocessor 1, also can be arranged on the outlet pipe before SCR preprocessor 1, also can be arranged in the position that other can utilize heat of engine, also can adopt the other forms of mode of heatings such as electric heating, its object is all to provide heat for the carbonic hydroammonium decomposition reaction in ammonia generator 2.Ammonia generator 2 is connected with ammonia nozzle 9 by defeated ammonia pipe 7, on described defeated ammonia pipe 7, flow control valve 8 is set; Described flow control valve 8 is electrically connected to control unit 3 or vehicle-mounted ECU, thereby control unit 3 or vehicle-mounted ECU are controlled the quantity delivered that the unlatching size of flow control valve 8 is controlled 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, mainly carrier and catalyzer, consists of, 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<sub TranNum="70">x</sub>effect.
Referring to Fig. 1, working procedure specifically comprises as follows: one, startup system: during engine start, should will start for ammonium bicarbonate by using wet process ammonia processed and the quantitative injection system of motor SCR, control unit 3 is by ammonia generator temperature, the temperature and pressure parameter that pressure transducer 6 detects in ammonia generator 2, when the pressure drop of ammonia generator 2 is during to the working pressure minimum value of flow control valve 8, control unit 3 sends instruction and pumps into a certain amount of ammonium bicarbonate soln to ammonia generator, when the working pressure of ammonia generator 2 reaches the working pressure maximum value of flow control valve 8, stop pumping ammonium bicarbonate soln, when flow control valve 8 herein guarantees 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, ammonium bicarbonate soln decomposes: ammonium bicarbonate soln is decomposed into ammonia, carbon dioxide and water vapour mixed gas in ammonia generator 2 under the effect of outlet pipe or electric heater heating, and mixed gas makes ammonia generator 2 pressure be elevated to the range of working pressure of flow control valve 8.Three, ammonia sprays: when ammonia generator 2 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 7, then the mixed gas of ammonia, carbon dioxide and water vapour is sprayed in outlet pipe, flow control valve 8 sprays into the amount in outlet pipe according to control unit 3 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 ammonium bicarbonate soln of again annotating: when ammonia generator 2 internal pressures drop to flow control valve 8 working pressure minimum value, control unit 3 sends instruction and again in ammonia generator 2, pumps into certain ammonium bicarbonate soln, ammonium bicarbonate soln generates ammonia, carbon dioxide and water vapour mixed gas in the interior reaction of ammonia generator 2, make to reach and be raised to flow control valve 8 working pressure maximum values in ammonia generator 2 internal pressures, then suspend pumping ammonium bicarbonate soln, so periodic duty.In the present invention, owing to adopting, directly in outlet pipe, spray into ammonia, can not have Crystallization Plugging problem; Do not need expensive 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 (6)
1. the ammonia processed of the ammonium bicarbonate by using wet process for motor SCR and metering injection system, comprise 1:SCR preprocessor, 2: the anti-raw device of ammonia, 3: control unit, 4: electromagnetic switch valve, 5: ammonium bicarbonate solution pipe, 6: ammonia generator temperature, pressure transducer, 7: defeated ammonia pipe, 8: flow control valve, 9: ammonia nozzle.
2. a kind of ammonium bicarbonate by using wet process for motor SCR according to claim 1 ammonia processed and metering injection system, it is characterized in that: on described ammonia generator (2), be provided with temperature, pressure transducer (6), described temperature, pressure transducer (6) are electrically connected to control unit (3) or vehicle-mounted ECU.
3. a kind of ammonium bicarbonate by using wet process for motor SCR according to claim 1 ammonia processed and metering injection system, it is characterized in that: described ammonium bicarbonate soln can motor-drive pump, pneumatic pump, the equipment that oil hydraulic pump and other forms can be carried out pressurized delivered to ammonium bicarbonate soln delivers into ammonia generator (2) by ammonium bicarbonate solution pipe (5).
4. a kind of ammonium bicarbonate by using wet process for motor SCR according to claim 1 ammonia processed and metering injection system, it is characterized in that: described ammonia generator is arranged on engine exhaust pipe, reaction institute calorific requirement can be by engine exhaust pipe, engine exhaust, or the mode such as electric heating provides.
5. a kind of ammonium bicarbonate by using wet process for motor SCR according to claim 1 ammonia processed and metering injection system, is characterized in that: described defeated ammonia pipe is preferably arranged in parallel to utilize engine exhaust pipe to its companion's heat with engine exhaust pipe; Also can adopt according to actual needs electric heating companion heat, to avoid the raw reverse reaction of ammonia and carbon dioxide occurs at low temperatures to generate carbaminate blocking pipe.
6. a kind of ammonium bicarbonate by using wet process for motor SCR according to claim 1 ammonia processed and metering injection system, it is characterized in that: described flow control valve can be gas or steam Proportional valve, throttle valve, gas nozzle etc. can accurately be controlled the flow control device of mixed vapour.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310486881.8A CN103511041A (en) | 2013-10-17 | 2013-10-17 | System for preparing ammonia through ammonium bicarbonate according to wet method and conducting injection in measured mode and for engine SCR |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310486881.8A CN103511041A (en) | 2013-10-17 | 2013-10-17 | System for preparing ammonia through ammonium bicarbonate according to wet method and conducting injection in measured mode and for engine SCR |
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| JP2007182804A (en) * | 2006-01-06 | 2007-07-19 | Hino Motors Ltd | Exhaust emission control device |
| WO2008126118A1 (en) * | 2007-04-12 | 2008-10-23 | Politecnico Di Milano | Apparatus and process for reducing the content of nitrogen oxides in exhaust gases of combustion systems |
| CN101523021A (en) * | 2006-10-02 | 2009-09-02 | 排放技术有限公司 | Method and device for providing a reducing agent-comprising gas flow |
| US20090229258A1 (en) * | 2008-03-05 | 2009-09-17 | Hydraulik-Ring Gmbh | Exhaust-Gas Aftertreatment Device |
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| CN101988409A (en) * | 2009-08-03 | 2011-03-23 | 海德里克林有限公司 | SCR exhaust gas aftertreatment device |
| CN102720572A (en) * | 2012-06-29 | 2012-10-10 | 中国第一汽车股份有限公司 | Post-processing control unit of active matter ammonia-storage and ammonia-supply of exhaust pipe waste heat method |
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2013
- 2013-10-17 CN CN201310486881.8A patent/CN103511041A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000029728A1 (en) * | 1998-11-13 | 2000-05-25 | Engelhard Corporation | STAGED REDUCTANT INJECTION FOR IMPROVED NOx REDUCTION |
| JP2005273509A (en) * | 2004-03-24 | 2005-10-06 | Mitsubishi Fuso Truck & Bus Corp | NOx REMOVAL EQUIPMENT AND NOx REMOVING METHOD |
| JP2007182804A (en) * | 2006-01-06 | 2007-07-19 | Hino Motors Ltd | Exhaust emission control device |
| CN101523021A (en) * | 2006-10-02 | 2009-09-02 | 排放技术有限公司 | Method and device for providing a reducing agent-comprising gas flow |
| CN101594925A (en) * | 2006-10-20 | 2009-12-02 | 约翰逊马西有限公司 | Can hot nitric oxide adsorbent of regenerating |
| WO2008126118A1 (en) * | 2007-04-12 | 2008-10-23 | Politecnico Di Milano | Apparatus and process for reducing the content of nitrogen oxides in exhaust gases of combustion systems |
| US20090229258A1 (en) * | 2008-03-05 | 2009-09-17 | Hydraulik-Ring Gmbh | Exhaust-Gas Aftertreatment Device |
| CN101660442A (en) * | 2008-05-28 | 2010-03-03 | 中国第一汽车集团公司 | Vehicle-mounted SCR metering and ejecting system taking NOx in exhaust gas as variable |
| CN101988409A (en) * | 2009-08-03 | 2011-03-23 | 海德里克林有限公司 | SCR exhaust gas aftertreatment device |
| CN101829486A (en) * | 2010-06-08 | 2010-09-15 | 叶力平 | Process and system for preparing ammonia from ammonium bicarbonate by using wet process for flue gas denitration |
| CN102720572A (en) * | 2012-06-29 | 2012-10-10 | 中国第一汽车股份有限公司 | Post-processing control unit of active matter ammonia-storage and ammonia-supply of exhaust pipe waste heat method |
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Application publication date: 20140115 |