CN108425726B - SCR system heating device and control method thereof - Google Patents
SCR system heating device and control method thereof Download PDFInfo
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- CN108425726B CN108425726B CN201810262342.9A CN201810262342A CN108425726B CN 108425726 B CN108425726 B CN 108425726B CN 201810262342 A CN201810262342 A CN 201810262342A CN 108425726 B CN108425726 B CN 108425726B
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 22
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 96
- 239000004202 carbamide Substances 0.000 claims abstract description 96
- WTHDKMILWLGDKL-UHFFFAOYSA-N urea;hydrate Chemical compound O.NC(N)=O WTHDKMILWLGDKL-UHFFFAOYSA-N 0.000 claims abstract description 58
- 238000005485 electric heating Methods 0.000 claims abstract description 38
- 238000005338 heat storage Methods 0.000 claims abstract description 38
- 238000010257 thawing Methods 0.000 claims abstract description 28
- 239000002918 waste heat Substances 0.000 claims abstract description 24
- 238000011084 recovery Methods 0.000 claims abstract description 19
- 239000007789 gas Substances 0.000 claims abstract description 9
- 239000000498 cooling water Substances 0.000 claims description 41
- 239000000110 cooling liquid Substances 0.000 claims description 13
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 6
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- 238000009413 insulation Methods 0.000 claims description 4
- 239000011810 insulating material Substances 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 2
- 230000005611 electricity Effects 0.000 claims description 2
- 239000004411 aluminium Substances 0.000 claims 2
- 238000004378 air conditioning Methods 0.000 claims 1
- 230000007613 environmental effect Effects 0.000 abstract 1
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000012774 insulation material Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 239000010705 motor oil Substances 0.000 description 2
- 239000013618 particulate matter Substances 0.000 description 2
- 238000006722 reduction reaction Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000011232 storage material Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
- F01N3/2073—Selective catalytic reduction [SCR] with means for generating a reducing substance from the exhaust gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
- F01N3/2013—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using electric or magnetic heating means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
- F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N5/00—Exhaust or silencing apparatus combined or associated with devices profiting from exhaust energy
- F01N5/02—Exhaust or silencing apparatus combined or associated with devices profiting from exhaust energy the devices using heat
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
- F01N2570/14—Nitrogen oxides
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1486—Means to prevent the substance from freezing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
- F01N2900/1602—Temperature of exhaust gas apparatus
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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
-
- 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
-
- 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
Abstract
The invention relates to a diesel automobile exhaust aftertreatment system, in particular to an SCR system heating device and a control method thereof, and also relates to an automobile exhaust waste heat recovery device. Aims at accelerating the defrosting speed of the SCR system when the environmental temperature is lower, and does not influence the operation of heating facilities such as an automobile air conditioner and the like. The waste heat recovery device mainly comprises a heat collector, a heat storage box and a heat exchange tube, and can recover and store the waste heat of the tail gas of the engine for a long time, and can be used for thawing urea water in the urea box when the engine is started in a cold mode. The urea pump, the urea nozzle and the urea pipeline are respectively covered with electric heating sleeves with different powers according to different required heat, and the thawing speed can be quickly improved by electrifying and heating; the electric heating sleeve is provided with an electric wire quick connector, so that the electric heating sleeve is convenient to install and replace.
Description
Technical Field
The invention relates to a diesel automobile exhaust aftertreatment system, in particular to a heating device and a heating method of an SCR system, and also relates to an automobile exhaust waste heat recovery device.
Background
Lean burn of diesel engines produces more NO x And Particulate Matter (PM), which are not reachable by means of optimizing combustion in a diesel engine cylinder and emission reduction techniques alone, in order to meet increasingly stringent automotive emissions regulations, require the use of aftertreatment techniques. The SCR technology has the advantages of no extra fuel consumption, strong oil product adaptability and the like, and becomes the tail of the national VI diesel engineThe primary scheme of gas treatment.
The SCR technology has simple reaction conditions and convenient use. The SCR system mainly comprises a urea box, a urea injection system and a catalytic reaction device. The SCR technology is to spray urea solution into the exhaust pipeline of diesel engine, and under the action of catalyst and exhaust gas temperature, the urea solution releases ammonia (NH 3 ) NO in exhaust gas x Reduction reaction is carried out to generate N 2 NO is reduced x Is arranged in the air. However, the urea water in the urea tank starts to crystallize at about-11 ℃, which can cause the blockage of the SCR system pipeline, and the urea nozzle can not work normally, thereby affecting the emission of the diesel engine.
At present, two heating devices of an SCR system are arranged, namely an engine cooling liquid pipeline is arranged in a urea box, the urea box is heated by utilizing the temperature of cooling liquid, the urea in the urea box can only be heated by the method, the urea in the pipeline of the system cannot be heated, and the heating device is arranged on a urea pump in a urea injection system, so that the method is complex, the cost is high, and when the temperature is higher than minus 11 ℃, the heating device is in a stop working state, and space is wasted.
Disclosure of Invention
The invention aims to solve the problems.
In winter or in areas with low temperature (temperature lower than-11 ℃), the urea water in the SCR system can be frozen when the engine is cold started. In the prior art, an engine cooling water pipe is usually connected to a urea tank of an SCR system for heating the SCR system.
When the engine is started in a cold mode, the temperature of cooling water of the engine is low, and the cooling water is introduced into the urea box, so that the thawing and heating speeds of the urea box and the urea water crystallized and frozen in the pipeline of the urea injection system are too slow, the normal operation of the SCR system is influenced, and meanwhile, the operation of heating facilities such as an automobile air conditioner is also influenced; meanwhile, some urea water is stored in a pipeline of the SCR system, and crystallization occurs at a lower temperature. The invention aims to accelerate the defrosting speed of the SCR system when the ambient temperature is low, and the heating facilities such as an automobile air conditioner and the like are not affected.
The invention provides a device for heating SCR by using a waste heat recovery device, which aims to solve the problems, and the rest heat recovery devices comprise: the heat collector is used for recovering the waste heat of the tail gas, an inlet and an outlet are formed in the heat collector, clamps are arranged on the inlet and the outlet, the heat collector is convenient to install on the exhaust pipe, and the joint is good in sealing performance; a pump for circulating the heat transfer medium of the waste heat recovery device; the electromagnetic valve is used for controlling the opening and closing of the pipeline; the heat exchange pipe is branched from the heat storage box receiving device and is inserted into the urea box; the heat storage box is used for storing heat-conducting media; the heat conducting medium flows among the heat storage box, the exhaust pipe heat collector and the heat exchange pipe, and can store more heat; a liquid storage tank storing a heat transfer medium for compensating for the loss; the SCR heating device includes: an air solenoid valve for controlling the opening and closing of the coolant pipe; the urea pump is connected with the urea box and the urea nozzle by virtue of a urea water pipeline and is used for carrying out pressurized conveying on urea water; a urea nozzle for injecting urea water under pressure; the electric heating sleeve is arranged on the urea water pipeline and the urea nozzle; the temperature sensor is connected with the engine ECU through a wire harness and is used for detecting the temperatures of the urea box, the waste heat recovery device and the urea nozzle; and the whole car power supply supplies power to the electric heating sleeve.
In the scheme, temperature sensor installs in jar internal portion, heat storage case inside and urea nozzle department, is connected with engine ECU through the pencil.
In the scheme, an air electromagnetic valve is arranged at the joint of the urea box and the engine cooling water pipeline.
In the scheme, the pipeline and the urea nozzle of whole SCR system are wrapped up to the electric heating cover, and the electric heating cover can be dismantled, is connected with whole car power through the pencil, is equipped with electric wire quick-operation joint on the pencil, and the power passes through engine ECU control, and the electric heating cover of different powers is selected according to the difference of required heat to the different positions of SCR system.
In the scheme, when the engine is started in a cold mode, a temperature sensor detects the temperature of urea water in a urea box, when the temperature of the urea box is lower than a set threshold value and the temperature of cooling water is lower than a defrosting threshold value, the temperature sensor sends a signal, the signal is fed back to an engine ECU, the ECU controls an electromagnetic valve on a heat exchange tube to be opened, and a heat conducting medium flows through the urea box through the heat exchange tube to heat the urea water; when the cooling liquid temperature sensor detects that the temperature of the cooling liquid is higher than the defrosting threshold, the ECU controls the electromagnetic valve on the heat exchange tube to be closed, the electromagnetic valve of the cooling liquid pipe is opened, the cooling liquid flows through the urea box to exchange heat with the urea water, and meanwhile, the ECU controls the whole vehicle power supply to supply power to the electric heating sleeve to heat the urea water pipeline of the SCR system; the engine ECU receives the signal of the temperature sensor, when the temperature of the urea box is higher than a set threshold value, and when the temperature of the urea nozzle is higher than the set threshold value, and after the urea water is heated for a period of time after passing through the urea box, the ECU controls the electromagnetic valve of the cooling liquid pipe to be closed, and the urea water is heated; when the engine ECU receives the signal of the temperature sensor and the temperature of the urea tank or the temperature of the urea nozzle is lower than a set threshold value, the ECU controls the electromagnetic valve of the cooling liquid pipe to be opened until the engine stops working and is closed.
The invention has the advantages that:
1. the detachable electric heating sleeve uses the electric wire quick connector, so that the electric heating sleeve is convenient to assemble and replace; when the diesel engine is started cold or the temperature is lower, the ECU controls the power output, the heating sleeve can quickly improve the temperature rising speed of the SCR system, the urea water is prevented from crystallizing, and the efficiency is improved.
2. By adopting the device, exhaust waste heat can be recovered and stored for a long time, and the stored heat is used for thawing urea water in the urea box, so that the influence on the temperature of cooling water during cold start is reduced, and energy is saved. When the engine is started at low temperature, the temperature of cooling water can be better increased, the influence on the operation of facilities such as automobile air conditioner heating and the like caused by the too low temperature of the cooling water is avoided, and the condition is provided for the normal operation of the diesel engine aftertreatment device at the temperature lower than 11 ℃.
3. The waste heat recovered from the exhaust gas can also be used for preheating cooling water, engine oil, a gearbox and the like, so that energy sources are saved.
Description of the drawings:
FIG. 1 is a schematic diagram of a urea heating device of an SCR system;
FIG. 2 is a schematic diagram of a waste heat recovery device;
FIG. 3 is a schematic view of a heat exchange tube structure;
FIG. 4 is a schematic view of the inlet structure of the heat collecting pipeline;
FIG. 5 is a schematic view of the outlet structure of the heat collecting pipeline;
in fig. 1: 1. the engine comprises an engine, 2, an engine ECU,3, a urea box, 4, an electric heating sleeve, 5, a urea pump, 6, a urea nozzle, 7, a urea nozzle temperature sensor, 8, a wire quick connector, 9, a whole vehicle power supply, 10, a heat exchange tube, 101, a radiating fin, 11, a waste heat recovery device, 12, a heat storage box temperature sensor, 13, a heat exchange tube one-way valve, 14, an air electromagnetic valve, 15, a urea box temperature sensor, 16, a cooling water temperature sensor, 17 and an engine cooling water pipe.
In fig. 2: 18. the heat-conducting device comprises an exhaust pipe, 19, an aluminum shell, 100, a heat collector, 20, a heat collecting pipe, 21, a heat collector pipeline outlet, 22, a heat collecting pipe one-way valve, 23, a three-way valve, 24 liquid storage tanks, 25, a pump, 200, a heat storage tank, 26, a heat storage material, 27, a heat storage pipe, 28, a heat insulation material, 29, a vacuum heat insulation layer, 30, an aluminum shell, 31, a three-way valve, 32, a one-way valve, 33, a heat collecting pipeline inlet, 34, a clamp, 35 and a heat conducting medium.
The specific embodiment is as follows:
as shown in fig. 1, it includes: the heat collector 100 is connected with the exhaust pipe 18 and used for recovering the waste heat of tail gas; a pump 25 for circulating the heat transfer medium 35 of the waste heat recovery device 11; a heat exchange pipe 10 branching from the heat storage tank and inserted into the urea tank 3; a heat storage tank 200 for storing the heat transfer medium 35; the heat transfer medium 35 flows between the heat storage tank 200, the heat collector 100, and the heat exchange tube 10, and can store a large amount of heat; a liquid storage tank 24 for storing a heat transfer medium 35 for compensating the loss; a urea tank 3 for storing urea water in the injection exhaust pipe 18; an engine cooling water pipe 17 branched from the engine cooling water pipe and inserted into the urea tank 3 to connect the urea tank 3 to the engine 1; a heat exchange tube one-way valve 13 for controlling the heat exchange tube 10 to be opened and closed; an air solenoid valve 14 for controlling the opening and closing of the cooling water pipe 17; the urea pump 5 is connected with the urea box 3 and the urea nozzle 6 by virtue of a urea water pipeline and is used for carrying out pressurized conveying on urea water; a urea nozzle 6 for injecting urea water under pressure; an electric heating jacket 4 for heating the urea water pipeline and the urea nozzle 6; and the whole vehicle power supply 9 supplies power to the electric heating sleeve 4.
As shown in fig. 2, waste heat recovery includes heat collection, heat storage and transfer processes. The heat collector 100 is arranged on the exhaust pipe 18, the heat collector 100 is provided with an exhaust inlet and an exhaust outlet, and the exhaust inlet and the exhaust outlet are provided with the clamp 34, so that the heat collector is convenient to be arranged on the exhaust pipe 18 and has good sealing performance; the heat collector 100 is composed of an aluminum case 19 and a heat collecting pipe 20, and the heat collecting pipe 20 is spirally wound on the exhaust pipe 18. In the heat collection and heat storage process, the heat exchange tube check valve 13 is closed, the heat collection tube check valve 22 and the electromagnetic valve 32 are opened, the pump 25 is electrified to work, the heat conducting medium 35 is input from the heat collector pipeline inlet 33 through the pump 25, heat is absorbed from exhaust gas through the heat collection tube 20 and output from the heat collector pipeline outlet 21, the heat conducting medium 35 flows into the heat storage tank 200, the heat insulating material 28 stores the heat in the heat conducting medium 35, and the heat conducting medium 35 flows from the other end of the heat storage tank 200 to the heat collector inlet 33, so that circulation is formed. The heat storage tank 200 is composed of a heat insulating material 28, a vacuum insulation layer 29 and an aluminum case 30. During the heat transfer process, the heat collecting pipe check valve 22 and the electromagnetic valve 32 are closed, the heat collecting pipe check valve 13 is opened, the pump 27 works, the heat conducting medium 35 flows out of the heat storage tank 200, and flows back to the heat storage tank 200 after heat is transferred to the outside through the heat collecting pipe 10, so that circulation is formed.
In the scheme, the heat collecting pipeline inlet 33 and the heat collecting pipeline outlet 21 are provided with the clamp 34, so that the heat collecting pipeline inlet and the heat collecting pipeline outlet are conveniently connected with a pipeline of the waste heat recovery device 11.
In the scheme, temperature sensors are installed inside the tank body, inside the heat storage tank and at the urea nozzle, and are connected with the engine ECU2 through a wire harness.
In the solution, an air solenoid valve 14 is provided at the junction of the urea tank 3 and the engine cooling water pipe 17.
In the scheme, the pipeline and the urea nozzle 6 of whole SCR system are wrapped up by electric heating cover 4, and electric heating cover 4 can be dismantled, is connected with whole car power 9 through the pencil, is equipped with electric wire quick-operation joint 8 on the pencil, and whole car power 9 passes through engine ECU2 control, and the electric heating cover 4 of different powers is selected according to the difference of required heat in the different positions of SCR system.
In the scheme, the pump 25 is connected with the engine ECU2 and the whole vehicle power supply 9 through a wire harness.
In the illustrated embodiment, the heat storage material 26 is a molten salt.
In the above embodiment, the heat conducting medium 35 is heat conducting oil.
In the described scheme, the thermal insulation material 28 is a rubber-plastic thermal insulation material, and has a relatively low and stable thermal conductivity coefficient, so that the thermal insulation can be ensured for a relatively long time.
In this case, all the temperature sensors are connected to the engine ECU 2.
In the solution described, the heat exchanger tube 10 is provided with cooling fins 101.
In this embodiment, the heat exchange tube 10 may be modified to be used for preheating engine oil, a gearbox (not shown), and the like.
The control method of the waste heat recovery device 11 is as follows:
as shown in fig. 2, when the engine is started, the engine ECU2 first controls the power supply to make the whole waste heat recovery device inactive, the electromagnetic valve is in a closed state, then judges whether the heat storage tank temperature is higher than a set heat extraction threshold value according to the heat storage tank temperature sensor 12 (when the heat storage tank temperature is lower than the set heat extraction threshold value, the heat of the heat conducting medium is insufficient for heat exchange to the outside), and if yes, the engine ECU2 controls the heat collection pipe check valve 22, the heat exchange pipe check valve 13 and the check valve 32 to be closed, and the pump 25 is not operated; if not, the engine ECU2 controls the heat collecting pipe check valve 22 and the check valve 32 to be opened, the whole vehicle power supply 9 supplies electricity to the pump 25, the pump 25 works, the heat conducting medium 35 circulates between the heat collector 100 and the heat storage tank 200, when the temperature of the heat storage tank is higher than the heat collecting threshold value, the engine ECU2 controls the whole waste heat recovery device 11 to stop working, the electromagnetic valves are all in a closed state, and the pump 25 stops working.
The control method of the whole heating device is as follows:
as shown in fig. 1, engine cooling water pipes 17 are connected to both ends of the urea tank 3, and the in-pipe cooling liquid is used for defrosting urea water. At the time of engine cold start, the engine ECU2 first prohibits the opening of the heat exchange tube check valve 13 and the air solenoid valve 14, and shuts off the power supply 9 to the electric heating jacket 4.
Subsequently, the engine ECU2 determines, based on the signal transmitted from the temperature sensor, whether or not the temperature of the urea water in the urea tank 3 and the urea nozzle 6 is below a preset first threshold (which is obtained by calibration in the whole vehicle factory, typically about-11 ℃ and at which the urea water starts to partially crystallize), and if not, does not open the air solenoid valve 14 and the heat exchange line check valve 13 and the whole vehicle power supply 9 does not supply power to the electric heating jacket 4, and maintains the state where the air solenoid valve 14 and the heat exchange line check valve 13 are prohibited from opening, and maintains the state where the whole vehicle power supply 9 is prohibited from supplying power to the electric heating jacket 4.
When the urea tank temperature sensor 15 detects that the urea water temperature is lower than a set first threshold value and the cooling water temperature sensor 16 detects that the cooling water temperature is lower than a thawing threshold value (the temperature value is obtained by calibration of a whole vehicle plant), the engine ECU2 controls the air solenoid valve 14 to be closed when the cooling water at the temperature value can exchange heat with the urea water without affecting the operation of heating facilities such as an automobile air conditioner, the engine ECU2 judges whether the temperature of the heat storage tank 11 is higher than a set second threshold value (the heat conduction oil at the value can transfer enough heat to the urea water) according to the signal transmitted by the heat storage tank temperature sensor 12, and if not (the vehicle is in a non-operating state for a long time generally), the heat exchange tube check valve 13 and the air solenoid valve 14 are closed, the engine ECU2 waits for the cooling water temperature signal to be higher than the thawing threshold value, the air solenoid valve 14 is opened, so that the cooling water exchanges heat with the urea water, and the engine ECU2 simultaneously controls the whole vehicle power supply 9 to supply power to the electric heating jacket 4, and the SCR system is heated.
When the engine is cold started, when the urea tank temperature sensor 15 detects that the urea water temperature is lower than a set first threshold value and the cooling water temperature sensor 16 detects that the cooling water temperature is lower than a defrosting threshold value, the engine ECU2 controls the air electromagnetic valve 14 to be closed, the engine ECU2 judges whether the temperature of the heat storage tank 11 is higher than a set second threshold value according to signals transmitted by the heat storage tank temperature sensor 12, if yes, the air electromagnetic valve 14 is opened, the engine ECU2 controls the pump 25 to work, the heat conducting medium 35 flows through the heat exchange tube 10 to exchange heat with the urea water, the engine ECU2 simultaneously controls the whole power supply 9 to supply power to the electric heating sleeve 4, the SCR system is heated, when the cooling water temperature is higher than the defrosting threshold value, the engine ECU2 opens the air electromagnetic valve 14 and simultaneously closes the heat exchange tube one-way valve 13 and the pump 25, so that the cooling water exchanges heat with the urea water and the whole power supply 9 is kept supplying power to the electric heating sleeve 4.
When the urea box temperature sensor 15 detects that the urea water temperature is lower than a set first threshold value and the cooling liquid temperature sensor 16 detects that the cooling water temperature is higher than a defrosting threshold value, the engine ECU2 controls the air solenoid valve 14 to be opened, so that the cooling water exchanges heat with the urea water, and the engine ECU2 simultaneously controls the whole vehicle power supply 9 to supply power to the electric heating sleeve 4 to heat the SCR system.
When the urea tank temperature sensor 15 detects that the urea water temperature is higher than the set first threshold value, but the temperature detected by the urea nozzle temperature sensor 7 is lower than the set threshold value, the engine ECU2 controls the air solenoid valve 4 to open, and controls the needle power supply 9 to supply power to the electric heating jacket 4.
If the urea tank temperature sensor 15 detects that the urea water temperature in the urea tank 3 and the urea nozzle 6 are both above the first threshold after thawing is completed and the device performs heating for a certain preset time (the time value is calibrated by the whole vehicle factory, from which it can be judged that the urea water in the SCR system is in a completely thawing state), the engine ECU2 controls the air solenoid valve 14 to be closed and the whole vehicle power supply 9 stops supplying power to the electric heating jacket 4.
If the urea tank temperature sensor 15 detects that the urea water temperature in the urea tank 3 and the urea nozzle 9 are above the threshold after thawing is completed and the device is heated for a certain preset time, the engine ECU2 controls the air solenoid valve 14 to open when the urea tank temperature sensor 15 detects that the urea tank 3 system temperature is again below the first threshold, exchanges heat and keeps warm for the SCR system, and the engine ECU2 controls the air solenoid valve 14 to close until the engine 1 stops working.
The present invention provides an SCR system and a device for heating urea water thereof, and a heating method thereof will be described in detail. It should be noted that it should be clear to those skilled in the art that various modifications are directly made on the basis of the present invention without inventive improvements and in principle still fall within the scope of protection of the present invention.
Claims (7)
1. A control method of an SCR system heating device, wherein the SCR system heating device comprises: the waste heat recovery device (11) collects the waste heat of the tail gas, and the waste heat recovery device (11) comprises: a heat collector (100), a heat storage tank (200), and a heat exchange tube (10); the heat conducting medium (35) in the waste heat recovery device (11) circulates between the heat collector (100), the heat storage box (200) and the heat exchange tube (10) by means of the pump (25), and the waste heat recovery process comprises heat collection, heat storage and heat exchange; the heat exchange pipe and the engine cooling liquid pipe (17) are inserted into the urea box (3), and the urea pump (5), the urea water pipeline and the urea nozzle (6) are all covered with an electric heating sleeve (4) for heating urea water;
the control method of the SCR system heating device comprises the following specific steps:
the engine cooling water pipe (17) is connected with two ends of the urea box 3, and cooling liquid in the pipe is used for thawing urea water; when the engine is started in a cold mode, the engine ECU (2) firstly prohibits the opening of the heat exchange tube one-way valve (13) and the air electromagnetic valve (14) and closes the power supply of the whole vehicle power supply (9) to the electric heating sleeve (4);
then, the engine ECU (2) judges whether the temperature of the urea water in the urea tank (3) and the urea nozzle (6) is below a preset first threshold value according to signals transmitted by a temperature sensor, the first threshold value is obtained by calibration of a whole vehicle factory, at the temperature value, the urea water starts to be partially crystallized, when the temperature value is negative, an air electromagnetic valve (14) and a heat exchange pipeline one-way valve (13) are not opened, the whole vehicle power supply (9) does not supply power to the electric heating sleeve (4), the opening state of the air electromagnetic valve (14) and the heat exchange pipeline one-way valve (13) is kept prohibited, and the state that the whole vehicle power supply (9) is prohibited from supplying power to the electric heating sleeve (4) is kept;
when the engine is started in a cold mode, when the temperature of urea water is lower than a set first threshold value detected by a urea box temperature sensor (15) and the temperature of cooling water is lower than a defrosting threshold value detected by a cooling water temperature sensor (16), the defrosting threshold value is calibrated by a whole vehicle plant, cooling liquid at the defrosting threshold value can exchange heat with the urea water when the operation of an automobile air-conditioning heating facility is not affected, an engine ECU (2) controls an air electromagnetic valve (14) to be closed, the engine ECU (2) judges whether the temperature of a heat storage box (11) is higher than a set second threshold value according to a signal transmitted by a heat storage box temperature sensor (12), heat conduction oil at the second threshold value can transfer enough heat to the urea water, and when the temperature of the cooling water is not affected, namely the vehicle is in a long-time non-working state, a heat exchange pipe one-way valve (13) and an air electromagnetic valve (14) are closed, when the temperature signal of the cooling water is higher than the defrosting threshold value, the engine ECU (2) is waited for the cooling water to exchange heat with the urea water, the cooling water is opened, the engine ECU (2) simultaneously controls a power supply sleeve (9) to supply electricity to an electric heating system (4);
when the engine is started in a cold mode, when the temperature of urea water is lower than a set first threshold value through a urea box temperature sensor (15) and the temperature of cooling water is lower than a defrosting threshold value through a cooling water temperature sensor (16), an engine ECU (2) controls an air electromagnetic valve (14) to be closed, the engine ECU (2) judges whether the temperature of a heat storage box (11) is higher than a set second threshold value according to signals transmitted by a heat storage box temperature sensor (12), if yes, the air electromagnetic valve (14) is opened, the engine ECU (2) controls a pump (25) to work, a heat conducting medium (35) flows through a heat exchange tube (10) to exchange heat with the urea water, the engine ECU (2) simultaneously controls a whole vehicle power supply (9) to supply power to an electric heating sleeve (4), the SCR system is heated, when the temperature of the cooling water is higher than the defrosting threshold value, the engine ECU (2) opens the air electromagnetic valve (14) and simultaneously closes the heat exchange tube one-way valve (13) and the pump (25) to enable the cooling water and the urea water to exchange heat and keep the whole vehicle power supply (9) to supply power to the electric heating sleeve (4);
when the urea box temperature sensor (15) detects that the temperature of urea water is lower than a set first threshold value and the cooling water temperature sensor (16) detects that the temperature of cooling water is higher than a defrosting threshold value, the engine ECU (2) controls the air electromagnetic valve (14) to be opened so that the cooling water exchanges heat with the urea water, and the engine ECU (2) simultaneously controls the whole vehicle power supply (9) to supply power to the electric heating sleeve (4) to heat the SCR system;
when the urea box temperature sensor (15) detects that the urea water temperature is higher than a set first threshold value, but the temperature detected by the urea nozzle temperature sensor (7) is lower than the set threshold value, the engine ECU (2) controls the air electromagnetic valve (14) to be opened and controls the whole vehicle power supply (9) to supply power to the electric heating sleeve (4);
if the urea tank temperature sensor (15) detects that the temperature of urea water in the urea tank (3) and the position of the urea nozzle (6) are above a first threshold value after thawing is finished, and the device executes heating for a certain preset time, the whole vehicle factory is calibrated, the preset time can judge that the urea water in the SCR system is in a completely thawing state, the engine ECU (2) controls the air electromagnetic valve (14) to be closed, and the whole vehicle power supply (9) stops supplying power to the electric heating sleeve (4);
if the urea box temperature sensor (15) detects that the urea water temperature in the urea box (3) and the urea nozzle (6) are above the threshold value after thawing is finished and the device is heated for a certain preset time, the engine ECU (2) controls the air electromagnetic valve (14) to be opened when the urea box temperature sensor (15) detects that the urea box (3) system temperature is lower than the first threshold value again, and exchanges heat and keeps warm for the SCR system until the engine (1) stops working, and the engine ECU (2) controls the air electromagnetic valve (14) to be closed.
2. A control method of a heating device of an SCR system according to claim 1, characterized in that the heat collector (100) consists of an aluminium shell (19) and a heat collecting tube (20), the heat collecting tube (20) being spirally wound on the exhaust pipe (18), the heat collector (100) having an exhaust inlet and an exhaust outlet.
3. A control method for a heating device of an SCR system according to claim 2, characterized in that a clip (34) is provided at the exhaust inlet and outlet of the collector (100).
4. A control method of a heating device of an SCR system according to claim 2, characterized in that the collector circuit inlet (33) and the collector circuit outlet (21) are provided with clamps (34).
5. A control method of a heating device of an SCR system according to claim 1, characterized in that the heat storage tank (200) consists of a heat insulating material (28), a vacuum insulation layer (29) and an aluminium shell (30).
6. A control method of a heating device of an SCR system according to claim 1, characterized in that an electric heating sleeve (4) is arranged at the urea water pipeline and the urea pump (5) of the SCR system, the electric heating sleeve (4) is detachable, and a quick connector (8) with electric wires is arranged.
7. A control method of a heating device of an SCR system according to claim 1, characterized in that the heat exchange tube (10) is provided with cooling fins (101).
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