CN104564257A - Metered injection system of solid ammonium salt SCR - Google Patents
Metered injection system of solid ammonium salt SCR Download PDFInfo
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- CN104564257A CN104564257A CN201510026157.6A CN201510026157A CN104564257A CN 104564257 A CN104564257 A CN 104564257A CN 201510026157 A CN201510026157 A CN 201510026157A CN 104564257 A CN104564257 A CN 104564257A
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- Prior art keywords
- ammonia
- ammonium salt
- solid ammonium
- pressure
- injection system
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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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- 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
- Y02T10/40—Engine management systems
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- Exhaust Gas After Treatment (AREA)
Abstract
The invention discloses a metered injection system of solid ammonium salt SCR. The system comprises an ammonia generating unit, an energy storing device, an ammonia injection mechanism and an electric control unit; the energy storing device is used for absorbing pulse impact from gas pressure; a pressure vessel is connected with the energy storing device through solenoid valves; solid ammonium salt powder (such as mixture powder of ammonium carbonate and urea) is heated through resistance wires to generate stable high-pressure ammonia; a rib plate structure is arranged on the side surface of the pressure vessel, and a vertical plate rib structure is arranged at the bottom part of the pressure vessel; a spiral resistance wire is used as a heating performing unit; an electric control unit controls the special action of each solenoid valve and an air pressurizing pump so as to control the ammonia generation and injection. According to the system, the energy storing device and a pressure regulating valve are utilized to control the ammonia injection pressure, so that the pressure at an inlet of an ammonia injection opening can be constant, and as a result, the metering accuracy and stability of ammonia injection volume can be obviously improved; an ammonia generating mechanism is fast to heat and cool, and therefore, the response speed of ammonia generation is increased.
Description
Technical field
The present invention relates to the metering injection system of a kind of solid ammonium salt SCR for diesel exhaust aftertreatment, it belongs to diesel engine vent gas cleaning system; More particularly, relate to one and spray ammonia by heat solid ammonium salt to diesel exhaust aftertreatment system meters, for reducing the selective catalytic reduction SCR system of Diesel NOx discharge.
Background technique
In order to realize utilizing SCR technology to reduce Diesel NOx discharge, existing SCR technology adopts the mode of spraying urea liquid substantially, urea liquid decomposes in engine exhaust after-treatment system produces ammonia, ammonia reacts with the NOx in tail gas again, urea metering injection system disclosed in patent CN102032029A, CN102242658A, CN101975103A.There is a lot of problem in these urea metering injection systems, as comparatively large, higher to the requirement of material in urea injecting quantity error in dipping, complex structure, control difficulty are comparatively large, cost is higher, and there is the hidden danger of urea crystals in urea pump in actual applications.
Summary of the invention
In order to solve the deficiency in existing urea-SCR system design, the invention provides the metering injection system of a kind of solid ammonium salt SCR, this system architecture is simple, small and exquisite, and amount of parts is few, and energy consumption is low, and the volume and weight of SCR system is all less, with low cost; During practical application, the metering accuracy of ammonia emitted dose and the stability of a system, reliability, response characteristic are all better, are particularly useful for the medium and heavy-duty engines exhaust aftertreatment field meeting state four and more maximum discharge regulation.If utilize engine coolant as heating performance element, then the effects of energy saving and emission reduction of this system will be more remarkable.
The present invention solves its technical problem, and the technological scheme adopted is:
Plant the metering injection system of solid ammonium salt SCR, by the emitted dose regulating the dutycycle of ammonia nozzle solenoid valve to measure ammonia, it is characterized in that, comprising: by pressurized container 7, be arranged on the ammonia generating unit that solid ammonium salt heating machanism in pressurized container and sensor cluster are formed; By the accumulator 15 that device for drying and filtering 17 is connected with ammonia generating unit gas circuit; The ammonia injection equipment be linked in sequence by bidirectional electromagnetic valve 16, pressure regulator valve 19, solenoid valve 21, ammonia nozzle 22 be connected with accumulator gas circuit; And ECU (Electrical Control Unit); The upper end gas circuit of described pressurized container is connected with air pressurization pump; The built-in control algorithm of described ECU (Electrical Control Unit), accept engine CAN bus signal and sensor cluster testing signal, the operating conditions of real-time control ammonia generating unit, ammonia injection equipment and related valves system and the action of air pressurization pump executable operations, thus the generation of cooperation control ammonia and injection.
ECU (Electrical Control Unit) controlling resistance silk heat solid ammonium salt powder is to produce stable high pressure ammonia; The working pressure of pilot pressure container is 3 ~ 5bar, and the working pressure of ammonia nozzle is 2 ~ 3bar; In pressurized container, the operating temperature of ammonia generating unit is 60 DEG C ~ 80 DEG C.
The side of pressurized container 7 adopts the rib structure being convenient to quick heat radiating.Bottom adopts the vortex sheet-beam structure being convenient to rapid heating.
Like this, the emitted dose of the present invention by regulating the dutycycle of ammonia nozzle solenoid valve to measure ammonia.Accumulator absorbs the pulsatile impact of gas pressure, and pressurized container is connected by solenoid valve with accumulator; Utilize resistance wire intermittent type heat solid ammonium salt powder (mix powder as ammonium carbonate and urea), to produce stable high pressure ammonia, the working pressure of pressurized container is 3 ~ 5bar, the working pressure of ammonia nozzle is 2 ~ 3bar, and in pressurized container, the operating temperature of ammonia generating unit is 60 DEG C ~ 80 DEG C; Adopt accumulator and pressure regulator valve to control the jet pressure of ammonia, make ammonia nozzle entrance place maintain constant pressure; Pressure vessel wall adopts the rib structure being convenient to quick heat radiating, and bottom adopts the vortex sheet-beam structure being convenient to rapid heating, and heating performance element adopts spiral resistance wire; Air pressurization pump works after system-down or when adding solid ammonium salt, drains in accumulator by the remaining ammonia in pressurized container; ECU (Electrical Control Unit) controls the specific action of each solenoid valve and air pressurization pump, to control generation and the injection of ammonia.
When as installed uses, pressurized container is vertically installed, and lower than the mounting point of accumulator; The air pipe line interface of pressurized container is as far as possible away from the interface of high pressure ammonia air pipe, and pressurized container is as far as possible away from motor and engine exhaust pipe, and accumulator is as far as possible near the catalytic reactor of engine aftertreatment system.Utilize the mounting point of each parts different, realize the backflow of water vapour in pipeline, reduce water vapour to the injury of system.
The input signal of ECU (Electrical Control Unit) comprises each sensor signal in engine CAN bus signal, pressurized container and each sensor signal of catalytic reactor, and output signal comprises the heating executive signal in pressurized container, the actuating signal of each solenoid valve, air pressurization pump signal and system failure monitoring and diagnosis output signal; ECU (Electrical Control Unit) controls each performance element according to built-in control algorithm, thus the generation of cooperation control ammonia and injection.
Like this, solid ammonium salt powder (mix powder as ammonium carbonate and urea) in pressurized container is heated and produces ammonia, in engine exhaust after-treatment system, ammonia is sprayed by ammonia injection equipment, there is catalytic reduction reaction in the NOx in ammonia and tail gas, and then reduces Diesel NOx discharge.Heating performance element can adopt resistance wire or engine coolant.This scheme is applicable to different kinds of roads and off roader and boats and ships, is particularly useful for the medium and heavy-duty engines market meeting state four and more maximum discharge regulation.
Working principle of the present invention and process are: when this system starts, ECU (Electrical Control Unit) controls heating machanism and heats solid ammonium salt powder and produce high pressure ammonia, the solenoid valves action be connected with accumulator, high pressure ammonia drying enters accumulator after filtering, the pulsatile impact of accumulator Absorbable rod ammonia pressure, high pressure ammonia in accumulator is after pressure regulator valve decompression, voltage stabilizing, ECU (Electrical Control Unit) can Controlling solenoid valve and ammonia nozzle to realize the injection of ammonia, by the emitted dose regulating the dutycycle of ammonia nozzle solenoid valve to measure ammonia.When ammonia AEI After End of Injection or when adding solid ammonium salt, air pressurization pump is started working, and utilizes air density to be greater than the characteristic of ammonia density, and the remaining ammonia in pressurized container drains in accumulator and stores by pressurized air.
Compared with existing urea-SCR technology, advantage of the present invention and beneficial effect are: the first, and adopt heat solid ammonium salt to produce the mode of ammonia, the structure of SCR system is simple, small and exquisite, and amount of parts is few, and volume and weight is all less; Second, accumulator and pressure regulator valve is utilized to control the jet pressure of ammonia, make ammonia nozzle entrance place constant pressure, significantly decrease the overpressure ripple that ammonia impulse jet causes, eliminate the adverse effect of transient pressure ripple to ammonia nozzle ejection amount, thus considerably improve metering accuracy and the stability of ammonia emitted dose; 3rd, pressure vessel wall adopts the rib structure being convenient to quick heat radiating, and bottom adopts the vortex sheet-beam structure being convenient to rapid heating, and heating performance element adopts spiral resistance wire, improves the speed of response of ammonia generating unit; 4th, at ammonia AEI After End of Injection or when adding solid ammonium salt, utilize air pressurization pump to drain in accumulator by the remaining ammonia in pressurized container, avoid the leakage of ammonia to cause environmental pollution.
Accompanying drawing explanation
Fig. 1 is the metering injection system schematic diagram of a kind of solid ammonium salt SCR that the present invention adopts, and comprising: 1, ECU (Electrical Control Unit); 2, engine CAN bus signaling interface; 3, ECU (Electrical Control Unit) sensor signal interface; 4, ECU (Electrical Control Unit) actuator signal interface; 5, thermorelay and resistance wire is added; 6, solid ammonium salt powder (mix powder as ammonium carbonate and urea); 7, pressurized container; 8, dispel the heat floor; 9, humidity transducer; 10, temperature transducer; 11, pressure transducer; 12, solid ammonium salt charging hole; 13, air pressurization pump; 14, air pipe line; 15, accumulator; 16, bidirectional electromagnetic valve; 17, device for drying and filtering; 18, high pressure ammonia air pipe; 19, pressure regulator valve; 20, voltage stabilizing ammonia pipeline; 21, solenoid valve; 22, ammonia nozzle; 23, engine coolant outlet (for cooling jet); 24, engine coolant entrance (for cooling jet); 25, engine exhaust pipe.
Fig. 2 is the layout schematic diagram of pressure vessel wall rib structure in the present invention and bottom spiral resistance wire eddy's structure.Wherein, 2 (a) is front view, and 2 (b) is the A-A sectional drawing of 2 (a).
Fig. 3 is the layout schematic diagram of ammonia nozzle on engine exhaust pipe in the present invention.
Embodiment
The present invention is the metering injection system of a kind of solid ammonium salt SCR, and wherein heating performance element can be resistance wire, engine coolant, and the working principle of various mode is similar.Be now the embodiment of heating performance element with resistance wire, the present invention is described in further detail with concrete mode of execution by reference to the accompanying drawings.
As shown in Figure 1, the volume of pressurized container 7 that the present embodiment is selected is 1L.The inside of pressurized container 7 is provided with humidity transducer 9, temperature transducer 10, pressure transducer 11, resistive heater 5; ECU (Electrical Control Unit) 1, according to engine CAN bus signal, each sensor signal, by built-in algorithms Controlling solenoid valve 16,21 and air pressurization pump 13, carries out controlling in real time and monitoring to this solid ammonium salt SCR metering injection system.Utilize engine coolant to cool ammonia nozzle 22, prevent ammonia nozzle 22 from crossing cause thermal damage, cooling liquid, by engine coolant entrance 24 flow nozzle, exports 23 mass flowing nozzles by engine coolant.Utilize the water vapour in device for drying and filtering 17 dry filter gas and granule foreign, prevent device damage.All solenoid valves, heating performance element, air pressurization pump control by ECU (Electrical Control Unit) 1.
When this solid ammonium salt SCR metering injection system is started working, solenoid valve 16 is energized, resistance wire 5 is energized and heats solid ammonium salt powder 6, and solid ammonium salt powder 6 decomposes produces ammonia, enters accumulator 15 and store after ammonia drying filter 17 dry filter; When pressure transducer 11 detects that in pressurized container 7, gas pressure exceedes the upper limit, or temperature transducer 10 detects that in pressurized container 7, gas temperature exceedes the upper limit, and resistance wire 5 temporarily power-off stops heating; When pressure transducer 11 detects that in pressurized container 7, gas pressure is prescribed a time limit lower than lower, resistance wire 5 electrified regulation again; High pressure ammonia in accumulator 15, after pressure regulator valve 19 voltage stabilizing, decompression, can spray ammonia in engine exhaust after-treatment system.When system needs to spray ammonia, the energising of solenoid valve 21, ammonia nozzle 22 is opened, and ammonia nozzle 22 starts to spray ammonia, and ECU (Electrical Control Unit) 1 measures the emitted dose of ammonia by the dutycycle controlling ammonia nozzle 22 solenoid valve.
When ammonia AEI After End of Injection, resistance wire 5, solenoid valve 21 power-off, solenoid valve 16, air pressurization pump 13 are energized, air pressurization pump 13 starts to fill air in pressurized container 7, after a period of time, ammonia remaining in pressurized container 7 drains in accumulator 15 by pressurized air, subsequently, solenoid valve 16, air pressurization pump 13 power-off.
When resistance wire 5 is energized added to solid ammonium salt powder 6 a period of time, when pressure transducer 11 detects that in pressurized container 7, gas pressure is unchanged, system diagnostics solid ammonium salt powder 6 is not enough, solid ammonium salt lacks material tutorial light and lights, simultaneously, resistance wire 5, solenoid valve 21 power-off, solenoid valve 16, air pressurization pump 13 are energized, air pressurization pump 13 starts to fill air in pressurized container 7, after a period of time, ammonia remaining in pressurized container 7 drains in accumulator 15 by pressurized air, subsequently, solenoid valve 16,13 power-off; Now, solid ammonium salt charging hole 12 can be opened in pressurized container 7, add solid ammonium salt powder 6.
As shown in Figure 2, pressurized container 7 side is provided with quick heat radiating floor 8, and bottom is provided with the vortex sheet-beam structure of rapid heating, is distributed with spiral resistance wire 5 between vortex sheet-beam structure.
As shown in Figure 3, ammonia nozzle 22 is arranged on engine exhaust pipe 25.
Claims (7)
1. the metering injection system of a solid ammonium salt SCR, by the emitted dose regulating the dutycycle of ammonia nozzle solenoid valve to measure ammonia, it is characterized in that, comprise: by pressurized container (7), be arranged on the ammonia generating unit that solid ammonium salt heating machanism in pressurized container and sensor cluster are formed; By the accumulator (15) that device for drying and filtering (17) is connected with ammonia generating unit gas circuit; The ammonia injection equipment be linked in sequence by bidirectional electromagnetic valve (16), pressure regulator valve (19), solenoid valve (21), ammonia nozzle (22) be connected with accumulator gas circuit; And ECU (Electrical Control Unit); The upper end gas circuit of described pressurized container is connected with air pressurization pump; The built-in control algorithm of described ECU (Electrical Control Unit), accept engine CAN bus signal and sensor cluster testing signal, the operating conditions of real-time control ammonia generating unit, ammonia injection equipment and related valves system and the action of air pressurization pump executable operations, thus the generation of cooperation control ammonia and injection.
2. the metering injection system of solid ammonium salt SCR according to claim 1, it is characterized in that, described sensor cluster comprises temperature transducer (9), humidity transducer (10), pressure transducer (11).
3. the metering injection system of solid ammonium salt SCR according to claim 1, it is characterized in that, described ECU (Electrical Control Unit) controlling resistance silk heat solid ammonium salt powder is to produce stable high pressure ammonia; The working pressure of pilot pressure container is 3 ~ 5bar, and the working pressure of ammonia nozzle is 2 ~ 3bar; In pressurized container, the operating temperature of ammonia generating unit is 60 DEG C ~ 80 DEG C.
4. the metering injection system of solid ammonium salt SCR according to claim 1, is characterized in that, described solid ammonium salt heating machanism adopts Resistant heating or the heating of generator cooling liquid.
5. the metering injection system of solid ammonium salt SCR according to claim 1, is characterized in that, the side of described pressurized container (7) adopts the rib structure being convenient to quick heat radiating.Bottom adopts the vortex sheet-beam structure being convenient to rapid heating.
6. the metering injection system of solid ammonium salt SCR according to claim 4, is characterized in that, adopts spiral resistance wire during described employing Resistant heating.
7. the metering injection system of solid ammonium salt SCR according to claim 4, it is characterized in that, described solid ammonium salt powder is the mix powder of ammonium carbonate and urea.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510026157.6A CN104564257A (en) | 2015-01-20 | 2015-01-20 | Metered injection system of solid ammonium salt SCR |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510026157.6A CN104564257A (en) | 2015-01-20 | 2015-01-20 | Metered injection system of solid ammonium salt SCR |
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| CN104564257A true CN104564257A (en) | 2015-04-29 |
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| CN201510026157.6A Pending CN104564257A (en) | 2015-01-20 | 2015-01-20 | Metered injection system of solid ammonium salt SCR |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105422229A (en) * | 2015-12-17 | 2016-03-23 | 潍柴动力股份有限公司 | SCR (selective catalytic reduction) ammonia gas spraying and metering system and method |
| 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 |
| CN106769645A (en) * | 2016-12-28 | 2017-05-31 | 宁波立达智能控制技术有限公司 | Ammonium salt thermal decomposition balance device for pressure measurement |
| CN113090361A (en) * | 2019-12-23 | 2021-07-09 | 中国船舶重工集团公司第七一一研究所 | SCR supply injection system using solid ammonium as reducing agent |
| CN113090361B (en) * | 2019-12-23 | 2024-06-28 | 中国船舶集团有限公司第七一一研究所 | SCR (selective catalytic reduction) supply injection system taking solid ammonium as reducing agent |
-
2015
- 2015-01-20 CN CN201510026157.6A patent/CN104564257A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105422229A (en) * | 2015-12-17 | 2016-03-23 | 潍柴动力股份有限公司 | SCR (selective catalytic reduction) ammonia gas spraying and metering system and method |
| CN106769645A (en) * | 2016-12-28 | 2017-05-31 | 宁波立达智能控制技术有限公司 | Ammonium salt thermal decomposition balance device for pressure measurement |
| 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 |
| CN113090361A (en) * | 2019-12-23 | 2021-07-09 | 中国船舶重工集团公司第七一一研究所 | SCR supply injection system using solid ammonium as reducing agent |
| CN113090361B (en) * | 2019-12-23 | 2024-06-28 | 中国船舶集团有限公司第七一一研究所 | SCR (selective catalytic reduction) supply injection system taking solid ammonium as reducing agent |
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Application publication date: 20150429 |