CN102720575A - Aftertreatment control unit for storing and supplying ammonia by single-stage waste heat method - Google Patents
Aftertreatment control unit for storing and supplying ammonia by single-stage waste heat method Download PDFInfo
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- CN102720575A CN102720575A CN2012102201595A CN201210220159A CN102720575A CN 102720575 A CN102720575 A CN 102720575A CN 2012102201595 A CN2012102201595 A CN 2012102201595A CN 201210220159 A CN201210220159 A CN 201210220159A CN 102720575 A CN102720575 A CN 102720575A
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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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Abstract
The invention relates to an aftertreatment control unit for storing and supplying ammonia by a single-stage waste heat method. The aftertreatment control unit is characterized in that the signal output end of an electronic control unit is connected with an electromagnetic valve and a proportional valve through signal wires, a pressure sensor, a pressure-tolerant tank temperature sensor, a tail gas inlet temperature sensor and a NOX sensor are connected with the signal input end of the electronic control unit; an antifreeze solution conveying pipe is positioned in a pressure-tolerant tank and arranged in a coiled mode; solid ammonia-storing materials are filled in the pressure-tolerant tank; the induction end of the pressure-tolerant tank temperature sensor is inserted into the solid ammonia-storing materials; the induction end of the pressure sensor is positioned in the pressure-tolerant tank and does not contact the solid ammonia-storing materials; an air filter is connected with a reducing agent guide pipe through a reducing gas conveying pipe; the nozzle end of the reducing agent guide pipe stretches into a tail gas inlet pipe; the proportional valve is positioned on a reducing gas conveying pipeline; the induction ends of the tail gas inlet temperature sensor and the NOX sensor stretch into a tail gas inlet pipeline; the tail gas inlet pipe is connected with the gas inlet end of a selective catalytic reduction (SCR) postprocessor; and the gas outlet end of the SCR postprocessor is connected with a tail gas outlet pipe. By the aftertreatment control unit, a combination which consists of active materials, porous materials and adhesives is taken as a carrier for storing and discharging the ammonia, so that the efficiency of charging and discharging the ammonia is improved, a system is simplified, the reliability is improved, the cost is greatly reduced, and obstacles in large-scale industrial popularization and application are eliminated.
Description
Technical field
The present invention relates to a kind of single-stage waste heat mode and store up the reprocessing control unit that ammonia supplies ammonia, be applied to the SCR reprocessing industry of vehicle exhaust, also be applicable to the FCEV energy-storage system of fuel cell.
Background technique
Current, the whole world faces the comprehensive challenge of the energy and environment.Aspect the technological means selection of the emission compliance of orthodox car, people still face many difficult problems, for example, how to select the aspects such as technical approach of reprocessing.
SCR (Selective Catalytic Reduction) catalyzed conversion reduction technique is traditional post-processing technology.The essence of the traditional SCR technology of this employing liquid area is to utilize urea at high temperature to decomposite ammonia, under the comprehensive function of catalyzer and temperature, reacts the nontoxic N of generation under the desirable operating mode as ammonia and the NOX in the engine exhaust of reducing agent
2And H
2O, thus reach the purpose of purification.
Traditional SCR has lot of advantages, for example, can in the scope of delivery temperature 250 ~ 550oC, have 50 ~ 85% NOX removal efficient, and can effectively reduce the emission level of PM; Traditional SCR can easily satisfy Europe 4 and Europe 5 levels, also has the potentiality that reach Europe 6 levels; Reach traditional SCR technology that adopt in Europe 4 at present, the fuel oil consumption of motor can reduce by 3 ~ 6%; Traditional SCR catalyzer does not contain precious metal, and is more relatively low than cost; Traditional SCR is to the quality of fuel oil for vehicles, and particularly Sulpher content is insensitive.Based on above analysis, traditional SCR post-processing technology also relatively is fit to the vehicle condition and the fuel oil for vehicles situation of China.
If apply traditional vehicle-mounted SCR post-processing technology, must resolve carrier, catalyzer, carbamide reducing agent and add the dosage of supply network, carbamide reducing agent, the vital technological difficulties such as atomized spray, SCR catalyzer conversion efficiency, ammonia amount of leakage and system matches of carbamide reducing agent in China.
The upgrading each time of automobile emission standard all produces such or such shock effect to automobile industry.State's 4 standards Schedule of repeatedly postponing enforcement of China is not only the nonsynchronous sole cause of standard of fuel, also faces the problem of service facility construction of the carbamide reducing agent socialization of the supporting system of complicated social and liquid; For example, behind state's 4 standard implementations, can traditional required ECU (control unit) and DCU (batching unit) of running of SCR system be caused the demand immediately; Consider that present automatical control systems such as vehicle-mounted ECU all are imported products, the DCU of domestic enterprise's independent development is difficult to carry out with it the communication coupling, otherwise; If the employing import article of ECU and DCU system 100%; Not only price is very high, and the user is difficult to accept, and has source of goods problem at full stretch; Also face the complicated after sales service technology and the problem of cost, restricted the development and progress of whole automobile industry.In addition, the used liquid area reducing agent of traditional SCR system faces freezed in winter and is incubated the problem of thawing, and this has also caused the traditional SCR system complex and the reason of poor stability.
Therefore, how obtaining low cost and high performance after-treatment system is the core content that advances this art progress.Inorganic salts can be used as the good choice of technology of following SCR system to the ammonia adsorption-desorption characteristics.
Some salts of technical grade; For example, chloride and their mixtures such as strontium chloride, magnesium chloride or calcium chloride, the system that is used with ammonia; Be the heat absorption and the exothermic phenomenon of the adsorption-desorption process of above-mentioned chloride and ammonia, the refrigeration system of the ripe large cold storage that is applied to industry.
It is the general principles of chemistry that above-mentioned anhydrous chloride and ammonia carry out chemisorption; The chloride of a molecule can adsorb the ammonia of 6 ~ 8 molecules in theory; Form stable complex compound, ammonia is deviate from during heating, along with going deep into of research; It is found that the adsorption-desorption model of these chlorides and ammonia and the principles of chemistry can be applied to the SCR system of motor vehicle tail-gas purifying fully.
In the national patent Information Network; With the storage ammonia word and search that is the theme, the patent No. is that ' a kind of urotropine by using gas phase method tail gas ammonia recovery unit ', the patent No. of CN201120099229.7 is that ' be used for freezer machine room join ammonia bindiny mechanism ' and the patent No. of CN201020677361.7 is the characteristic component that ' complex function type stores up the ammonia device ' of CN201020269811.9 do not relate to the present invention.The patent No. is that CN200520057558.X's the patent of ' a kind of ammonia steaming device ' is a kind of the ammonia nitrogen industrial wastewater to be carried out the environment protection treating device that ammonia nitrogen is got rid of processing, does not also relate to the characteristic component among the present invention.Uncorrelated with the present invention.
Number of patent application is that CN201010244091.5's ' be used for method and system that the work of SCR catalyzer is tested ' and the patent No. is that 2 inventions of CN200880104697.X ' operation method of SCR exhaust after treatment system and diagnostic method ' provide a kind of SCR (SCR) catalytic converter and traditional liquid ureaclastic ammonia dispensing module and control system of being used for, and does not relate to characteristic component of the present invention.
Number of patent application is that CN200910197860.8's the invention of ' a kind of preparation method of efficient low-temperature ammonia-storing material ' is applied to the SCR after-treatment system, and characteristic is to adopt amino borane ammino-complex ammonia BH3 (NH3) n (n=1 ~ 3); The maximum storage of room temperature ammonia amount can reach 62.4wt%, still, considers costing an arm and a leg of amino borane, has higher blast and burning grade, is not suitable for applying in enormous quantities of general industry field.
Number of patent application is that CN200580026626.9's the invention of ' storage and carry the solid material of ammonia ' relates to storage and carries the solid material of ammonia.The solid material of this storage ammonia comprises M
a(NH3)
nX
zIonic salt, through the direct high-pressure molding of mould, for example, process cylinder to salt solid material, be arranged in a lot of this cylinders together then.The disadvantage of this patent is that cylinder is too closely knit; The saturated absorption of carrying out ammonia after each ammonia desorb is accomplished again needs for a long time, and for example 4 ~ 6 hours, efficient was very low; This becomes the reason that limits its application for the SCR storage ammonia system inconvenience of using on the automobile very.
Number of patent application be CN200580009219.7's ' purposes of ammonia storage device in energy production ', this invention relates to a kind of generator unit, comprising general formula is M
a(NH3)
NXzAmmonia absorb and discharge salt, this patent mainly is applicable to fuel cell system.In the claim 4 of this patent, mentioned property material and be such salt or be positioned on the porous carrier materials, which kind of porous material statement is not, and those skilled in the art can't be implemented.
Number of patent application be CN200710156866.1's ' a kind of amido complex compound ' disclosure of the Invention a kind of amido complex compound.The composition of this amido complex compound is MX
m(NH3)
n, this invention is to the separation of ammonia in the used circulating air of ammonia synthesis process.Claim only relates to the preparation process of this ammonobase complex compound.
Number of patent application is solid ammonia storage and the conveying material that CN200680005886.2's the patent of the high density of the ammonia ' storage ' comprises ammonia absorptions/desorb solid material; The said density that has been compacted to is greater than 50% storage of theoretical skeletal density with carry material that the solid ammonia storage medium is provided; The described metal salt solid material of this patent also is direct compression molding; Bond has been adopted in statement, has only stated it possibly is to have adopted the silicon dioxide fibre Bond, does not also have the dosage ratio; Do not offer some clarification on the thin item of the composition that other adopted, the professional and technical personnel almost can't implement.
The retrieval and the analysis of above-mentioned patent show, adsorbs and resolve ammonia with activity storage ammoniate, formed the after-treatment system of on vehicle, using and also do not appeared in the newspapers.
Summary of the invention
The object of the present invention is to provide a kind of single-stage waste heat mode to store up the reprocessing control unit that ammonia supplies ammonia, its composition that has adopted active material, porous material and Bond composition is as the carrier that stores up ammonia and put ammonia; The waste heat of engine coolant heats, and relies on control unit and one group of solenoid valve or Proportional valve, realizes that the SCR after-treatment system is carried and imported easily to the dosage of ammonia, realizes the removal to NOX; Improved the efficient that charges and discharge ammonia, simplified system improves reliability, also significantly reduces cost, and eliminates the obstacle that large-scale industry is applied.
Technological scheme of the present invention is achieved in that a kind of single-stage waste heat mode stores up the reprocessing control unit that ammonia supplies ammonia; Form by motor, antifreeze liquid delivery pipe, solenoid valve, autoclave, solid ammonia-storing material, air filter, charging hole, pressure transducer, subsequent use pipe valve, autoclave temperature transducer, reducing gas delivery pipe, electronic control unit, Proportional valve, gas inlet temperature transducer, NOX sensor, reducing agent conduit, tail gas entering pipe, exhaust emission tube, SCR preprocessor; It is characterized in that: the electronic control unit signal output part is connected with solenoid valve, Proportional valve through signaling line; Pressure transducer, autoclave temperature transducer, gas inlet temperature transducer, NOX sensor are connected with the electronic control unit signal input part through signaling line; Serial or parallel connection in the antifreeze liquid system of antifreeze liquid delivery pipe and motor; The antifreeze liquid delivery pipe passes from autoclave; The antifreeze liquid delivery pipe is positioned at the autoclave interior section and presents the coil pipe distribution; Solenoid valve is positioned on the antifreeze liquid delivery pipe pipeline; Fill 40% of solid ammonia-storing material tank body volume capacity in the autoclave, there are air filter, charging hole, pressure transducer, subsequent use pipe valve, autoclave temperature transducer in the autoclave top, and wherein autoclave temperature sensor senses end inserts in the solid ammonia-storing material; The pressure transducer induction end is positioned at autoclave but does not contact with the solid ammonia-storing material; Air filter is connected with the reducing agent conduit through the reducing gas delivery pipe, and reducing agent catheter nozzle end probes into tail gas and gets in the pipe pipe, and Proportional valve is positioned on the reducing gas delivery pipe pipeline; Gas inlet temperature transducer, NOX sensor are connected tail gas and get on the pipe; The induction end of gas inlet temperature transducer, NOX sensor probes into tail gas and gets in the pipe pipeline, and tail gas gets into pipe and connects SCR preprocessor inlet end, and SCR preprocessor outlet side connects exhaust emission tube.
Described solid ammonia-storing material preparation is following with filling method: adopt 58 parts of industrial anhydrous magnesium chlorides by weight; 2 parts of expanded graphites, 15 parts of deionized waters, 15 parts of 10 parts of industrial alcohols and industrial ball clays; Be stirred into the powder of hygrometric state through the dough mixing machine of machinery; Incorporation time 5 ~ 15min is filled in the autoclave through charging hole, adopts this withstand voltage tank body 5 ~ 10min of method concussion of machinery concussion; Remove air clearance wherein, the filling of solid ammonia-storing material causes 40% of tank body volume capacity and gets final product; Whole tank body is put into vacuum drying cabinet, begins heating, average 5 ℃/10min from 25 ℃ of room temperatures under the normal pressure; Be warmed up to 70 ℃, open wide charging hole discharge water steam and alcohol steam during heating, 70 ℃ keep 30min; Then at 70 ℃ of following startup vacuum pumps; Progressively vacuumize, divide to make degree of vacuum reach 550mabr three times heat-insulation pressure keeping 30min.
Described anhydrous magnesium chloride also can adopt other inorganic salts that can form complex compound to substitute, and can be the chloride that strontium chloride, nickel chloride, copper chloride or calcium chloride ability and NH3 form complex compound.
Described autoclave is the withstand voltage tank body of stainless steel, and the thickness of tank body is 4 ~ 5mm, and is cylindrical, tank interior thermal spraying one deck nylon thermal insulation layer.
Good effect of the present invention be accomplish once fill ammonia after, can guarantee that the mileage of vehicle driving is 20000 ~ 40000km, improved the efficient that charges and discharge ammonia; Simplified system; Improve reliability, also significantly reduce cost, have very high practicability, Economy and advance.
Description of drawings
Fig. 1 is an accompanying drawing of the present invention.
Embodiment
Through accompanying drawing and embodiment the present invention is described further below: as shown in Figure 1; A kind of single-stage waste heat mode is stored up the reprocessing control unit that ammonia supplies ammonia; Form by motor 1, antifreeze liquid delivery pipe 2, solenoid valve 3, autoclave 4, solid ammonia-storing material 5, air filter 6, charging hole 7, pressure transducer 8, subsequent use pipe valve 9, autoclave temperature transducer 10, reducing gas delivery pipe 11, electronic control unit 12, Proportional valve 13, gas inlet temperature transducer 14, NOX sensor 15, reducing agent conduit 16, tail gas entering pipe 17, exhaust emission tube 18, SCR preprocessor 19; It is characterized in that: electronic control unit 12 signal output parts are connected with solenoid valve 3, Proportional valve 13 through signaling line; Pressure transducer 8, autoclave temperature transducer 10, gas inlet temperature transducer 14, NOX sensor 15 are connected with electronic control unit 12 signal input parts through signaling line; Serial or parallel connection in the antifreeze liquid system of antifreeze liquid delivery pipe 2 and motor 1; Antifreeze liquid delivery pipe 2 passes from autoclave 4; Antifreeze liquid delivery pipe 2 is positioned at autoclave 4 interior sections and presents the coil pipe distribution; Solenoid valve 3 is positioned on antifreeze liquid delivery pipe 2 pipelines; Fill 40% of solid ammonia-storing material 5 tank body volume capacities in the autoclave 4, there are air filter 6, charging hole 7, pressure transducer 8, subsequent use pipe valve 9, autoclave temperature transducer 10 in autoclave 4 tops, and wherein autoclave temperature transducer 10 induction end are inserted in the solid ammonia-storing material 5; Pressure transducer 8 induction end are positioned at autoclave 4 but do not contact with solid ammonia-storing material 5; Air filter 6 is connected with reducing agent conduit 16 through reducing gas delivery pipe 11, and reducing agent conduit 16 nozzle end probe into tail gas and get in pipe 17 pipes, and Proportional valve 13 is positioned on reducing gas delivery pipe 11 pipelines; Gas inlet temperature transducer 14, NOX sensor 15 are connected tail gas and get on the pipe 17; The induction end of gas inlet temperature transducer 14, NOX sensor 15 probes into tail gas and gets in pipe 17 pipelines, and tail gas gets into pipe 17 and connects SCR preprocessor 19 inlet ends, and SCR preprocessor 19 outlet sides connect exhaust emission tube 18.
Described solid ammonia-storing material 5 preparations are following with filling method: adopt 58 parts of industrial anhydrous magnesium chlorides by weight; 2 parts of expanded graphites, 15 parts of deionized waters, 15 parts of 10 parts of industrial alcohols and industrial ball clays; Dough mixing machine through machinery mixes the powder that evenly becomes hygrometric state; Incorporation time 5 ~ 15min is filled in the autoclave 4 through charging hole 7, adopts this withstand voltage tank body 5 ~ 10min of method concussion of machinery concussion; Remove air clearance wherein, 5 fillings of solid ammonia-storing material cause 40% of tank body volume capacity and get final product; Whole tank body is put into vacuum drying cabinet, begins heating, average 5 ℃/10min from 25 ℃ of room temperatures under the normal pressure; Be warmed up to 70 ℃, open wide charging hole 7 discharge water steam and alcohol steams during heating, 70 ℃ keep 30min; Then at 70 ℃ of following startup vacuum pumps; Progressively vacuumize, divide to make degree of vacuum reach 550mabr three times heat-insulation pressure keeping 30min;
Described anhydrous magnesium chloride also can adopt other inorganic salts that can form complex compound to substitute, for example strontium chloride, nickel chloride, copper chloride or calcium chloride etc. can and NH3 form the chloride of complex compound.
Described autoclave is the withstand voltage tank body of stainless steel, and the thickness of tank body is 4 ~ 5mm, and is cylindrical, tank interior thermal spraying one deck nylon thermal insulation layer.
Selecting thickness is that at first to be welded into internal diameter be 300mm for the SUS304 plate of 4mm; Highly be the stainless steel cask of 330mm, order is accomplished the welding of liquid circulation pipeline and coil pipe, accomplishes the welding of bottom; The inner surface heat spraying nylon powder of bucket once notices that heating coil does not spray nylon; The welding of completion top capping, and in the capping of top, accomplish charging hole 7, pressure transducer 8, subsequent use pipe valve 9, autoclave temperature transducer 10, reducing gas delivery pipe 11 and filter 6, accomplished the connection of autoclave 4 relevant portions; Suppress leak test, guarantee that sealing and welding quality meet the demands;
Adopt 58 parts of industrial anhydrous magnesium chlorides by weight, 2 parts of expanded graphites, 15 parts of deionized waters, 15 parts of 10 parts of industrial alcohols and industrial ball clays, preparation mixture 10kg; Adopt the dough mixing machine of machinery to mix the powder that evenly becomes hygrometric state, incorporation time 10min progressively is filled in the autoclave 4 through charging hole 7, during adopt this withstand voltage tank body 5 ~ 10min of method concussion of machinery concussion; Put into vacuum drying cabinet to whole tank body, begin heating from 25 ℃ of room temperatures under the normal pressure, average 5 ℃/10min is warmed up to 70 ℃, and charging hole 7 opens wide during heat drying; Keep 30min under this temperature, under this temperature, start vacuum pump then, progressively vacuumize, divide to make degree of vacuum reach 550mabr three times heat-insulation pressure keeping 30min; Accomplish the making and the filling of solid ammonia-storing material 5.
Accomplish the autoclave 4 that solid ammonia-storing material 5 installs additional, adopt high-purity industrial ammonia bottle, fill ammonia through subsequent use pipe valve 9; Under the environment of natural ventilation, carry out, put into autoclave 4 tank of the enough big cooling water of water yield in advance, connect the ammonia steel cylinder, through reduction valve and drying system, in the outlet pressure scope of 0.1Mpa slowly fill ammonia, filling the ammonia time is 3h; Filling the autoclave 4 of weighing before and after the ammonia, the clean quality of the ammonia of confirming to charge into is greater than 8kg; After ammonia was filled in completion, the valve closing of whole system was guaranteed not reveal;
The electronic control unit 12 of join dependency, Proportional valve 13, NOX sensor 15, reducing agent conduit 16, gas inlet 17, tail gas exhaust port 18, SCR preprocessor 19 then; And be connected with state's 4 threst stands of a 8.6L, coolant pipe is parallel to cooling system, starts said system; Behind the engine running 5min, system pressure is shown as 0.15Mpa, start-up system; The delivery volume of setting ammonia is 90% of a theory demands amount, begins test, the NOX conversion ratio of test engine under 6 operating modes; Under the situation of ammonia leakage rate less than 10ppm, the NOX conversion ratio maintains in 61 ~ 87% scopes.
Antifreeze liquid delivery pipe 2 is that the pipeline parallel way with motor 1 liquid circulation is main, for the also operable serial fashion of Light-duty Vehicle; The heating coil of antifreeze liquid delivery pipe 2 is stainless-steel pipes, during the preparation of autoclave 4 tank bodies, welds together with tank body; The flow through amount of antifreeze liquid of autoclave 4 of antifreeze liquid delivery pipe 2 is controlled by the signal that autoclave temperature transducer 10 feeds back to electronic control unit 12; When surpassing 90 ℃, temperature closes; The resolution speed of ammonia reaches maximum value, and in jar, producing excess of ammonia can't consume, and close solenoid valve 3 through the signal of electronic control unit 12 this moment; Flowing of shutting engine down cooling liquid prevents the continuation input of heat; During parking, SCR preprocessor 19 quits work, and no longer needs ammonia, and close solenoid valve 3 through the signal of electronic control unit 12 this moment, and flowing of shutting engine down cooling liquid prevents the continuation input of heat; In addition, when the pressure limiting 0.8Mpa of the pressure Overpressure of a safety valve sensor 8 in autoclave 4 tank bodies, also be to close solenoid valve 3 through the signal of electronic control unit 12, flowing of shutting engine down cooling liquid prevents the continuation input of heat;
The ammonia Way out on autoclave 4 tank body tops has been installed air filter 6, guarantees that the inorganic powder in the tank body can not get into pipe-line system and stop up accurate device; Tank body is tightened charging hole 7 after adding solid ammonia-storing material 5; Pressure transducer 8 also is an automatic pressure-limit valve, guarantees the releasing pressure automatically of overpressure system;
On tank body, accomplish subsequent use pipe valve 9 is installed, the feeding of reactive gas and the completion of absorption are carried out through subsequent use pipe valve 9; Can adopt high-purity industrial ammonia bottle, under the environment of natural ventilation, the absorption of considering ammonia is exothermic process; Shifting out the heat of system timely is to guarantee the ammonia key of absorption fast, therefore, puts into a tank that the water yield is enough big to autoclave 4 in advance; Connect the ammonia steel cylinder; Through reduction valve and drying system, in the outlet pressure scope of 0.02 ~ 0.2Mpa slowly fill ammonia, filling the ammonia time is 2 ~ 3h; Filling the autoclave 4 of weighing before and after the ammonia, the clean quality of the ammonia of confirming to charge into is in prespecified range; After ammonia was filled in completion, the valve closing of whole system was guaranteed not reveal;
After autoclave 4 was accomplished and filled ammonia, the mounting point was and the side of SCR preprocessor 19 at vehicle so that reduce the length of pipeline, to reduce the time of system responses, the sensitivity of increase system responses;
When row's temperature of motor or NOX level reached certain level, the aperture of electronic control unit 12 control ratio valves 13 realized that ammonia changes to the conveying of SCR preprocessor 19, satisfies the demand that under the vehicle difference operating modes NOX is removed.
Equally, be assembled to said system on the heavy truck, according to the MAP figure of the NOX discharging of the normal operation of vehicle and this type; The delivery volume of setting ammonia is 80% of a theory demands amount; Coolant pipe is parallel to cooling system, and when 17000km, this system still has the ammonia supply; Real vehicle is measured full load NOX conversion ratio result in 38 ~ 53% scopes, meets design requirement.
Claims (4)
1. a single-stage waste heat mode is stored up the reprocessing control unit that ammonia supplies ammonia; Form by motor, antifreeze liquid delivery pipe, solenoid valve, autoclave, solid ammonia-storing material, air filter, charging hole, pressure transducer, subsequent use pipe valve, autoclave temperature transducer, reducing gas delivery pipe, electronic control unit, Proportional valve, gas inlet temperature transducer, NOX sensor, reducing agent conduit, tail gas entering pipe, exhaust emission tube, SCR preprocessor; It is characterized in that: the electronic control unit signal output part is connected with solenoid valve, Proportional valve through signaling line; Pressure transducer, autoclave temperature transducer, gas inlet temperature transducer, NOX sensor are connected with the electronic control unit signal input part through signaling line; Serial or parallel connection in the antifreeze liquid system of antifreeze liquid delivery pipe and motor; The antifreeze liquid delivery pipe passes from autoclave; The antifreeze liquid delivery pipe is positioned at the autoclave interior section and presents the coil pipe distribution, and solenoid valve is positioned on the antifreeze liquid delivery pipe pipeline, fills 40% of solid ammonia-storing material tank body volume capacity in the autoclave; There are air filter, charging hole, pressure transducer, subsequent use pipe valve, autoclave temperature transducer in the autoclave top; Wherein autoclave temperature sensor senses end inserts in the solid ammonia-storing material, and the pressure transducer induction end is positioned at autoclave but does not contact with the solid ammonia-storing material, and air filter is connected with the reducing agent conduit through the reducing gas delivery pipe; Reducing agent catheter nozzle end probes into tail gas and gets in the pipe pipe; Proportional valve is positioned on the reducing gas delivery pipe pipeline, and gas inlet temperature transducer, NOX sensor are connected tail gas and get on the pipe, and the induction end of gas inlet temperature transducer, NOX sensor probes into tail gas and gets in the pipe pipeline; Tail gas gets into pipe and connects SCR preprocessor inlet end, and SCR preprocessor outlet side connects exhaust emission tube.
2. store up the reprocessing control unit that ammonia supplies ammonia according to a kind of single-stage waste heat mode described in the claim 1, it is characterized in that described solid ammonia-storing material preparation is following with filling method: adopt 58 parts of industrial anhydrous magnesium chlorides, 2 parts of expanded graphites by weight; 15 parts of deionized waters; 10 parts of industrial alcohols and 15 parts of industrial ball clays, the dough mixing machine through machinery stirs and becomes the powder of hygrometric state, incorporation time 5 ~ 15min; Be filled in the autoclave through charging hole; This withstand voltage tank body 5 ~ 10min of method concussion of employing machinery concussion removes air clearance wherein, and the filling of solid ammonia-storing material causes 40% of tank body volume capacity and gets final product; Whole tank body is put into vacuum drying cabinet, begins heating, average 5 ℃/10min from 25 ℃ of room temperatures under the normal pressure; Be warmed up to 70 ℃, open wide charging hole discharge water steam and alcohol steam during heating, 70 ℃ keep 30min; Then at 70 ℃ of following startup vacuum pumps; Progressively vacuumize, divide to make degree of vacuum reach 550mabr three times heat-insulation pressure keeping 30min.
3. according to the solid ammonia-storing material described in the claim 2, it is characterized in that described anhydrous magnesium chloride also can adopt other inorganic salts that can form complex compound to substitute, strontium chloride, nickel chloride, copper chloride or calcium chloride ability and NH3 form the chloride of complex compound.
4. store up the reprocessing control unit that ammonia supplies ammonia according to a kind of single-stage waste heat mode described in the claim 1; It is characterized in that described autoclave is the withstand voltage tank body of stainless steel; The thickness of tank body is 4 ~ 5mm, and is cylindrical, tank interior thermal spraying one deck nylon thermal insulation layer.
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| CN201210220159.5A CN102720575B (en) | 2012-06-29 | 2012-06-29 | The aftertreatment control unit of single-stage waste heat storing and supplying ammonia |
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| CN201210220159.5A CN102720575B (en) | 2012-06-29 | 2012-06-29 | The aftertreatment control unit of single-stage waste heat storing and supplying ammonia |
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| CN103408035A (en) * | 2013-07-30 | 2013-11-27 | 中国第一汽车股份有限公司 | Automatic pressure balancing device for solid ammonia storing material system |
| CN104121076A (en) * | 2014-08-11 | 2014-10-29 | 吉林省众鑫汽车装备有限公司 | Solid ammonia storage device |
| CN107355284A (en) * | 2017-06-27 | 2017-11-17 | 中国第汽车股份有限公司 | The solid ammonia ammonia Automatic Provisioning System and its method of engine exhaust heat mode of heating |
| 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 |
| CN108487975A (en) * | 2018-03-28 | 2018-09-04 | 东风商用车有限公司 | A kind of storage ammonia and ammonia metering injection system having electrical heating and engine exhaust heat heating |
| CN111569804A (en) * | 2020-04-19 | 2020-08-25 | 山东三润助剂科技股份有限公司 | Acrylic ester polymer emulsion synthesis device and use method thereof |
| CN113685250A (en) * | 2021-08-24 | 2021-11-23 | 一汽解放汽车有限公司 | Engine exhaust aftertreatment system, method, vehicle and storage medium |
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| 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 |
| CN108487975A (en) * | 2018-03-28 | 2018-09-04 | 东风商用车有限公司 | A kind of storage ammonia and ammonia metering injection system having electrical heating and engine exhaust heat heating |
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