CN105626203A - Selective catalytic reduction (SCR) urea heating/cooling system and method - Google Patents
Selective catalytic reduction (SCR) urea heating/cooling system and method Download PDFInfo
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- CN105626203A CN105626203A CN201610049871.1A CN201610049871A CN105626203A CN 105626203 A CN105626203 A CN 105626203A CN 201610049871 A CN201610049871 A CN 201610049871A CN 105626203 A CN105626203 A CN 105626203A
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- cooling system
- urea
- water
- carbamide
- flow valve
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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
- F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention relates to the field of tail gas treatment of engineering machinery, in particular to a selective catalytic reduction (SCR) urea heating/cooling system and method. The system comprises an engine and a radiator and further comprises a heating and cooling pipe disposed in a urea tank. The heating and cooling pipe is provided with a first water inlet port and a first water outlet port. The engine is provided with a second water inlet port and a second water outlet port. The radiator is provided with a third water inlet port and a third water outlet port. In addition, the second water outlet port is connected with the third water inlet port in a communicating mode, and the third water outlet port is connected with the second water inlet port in a communicating mode, so that heat dissipation is performed on the engine. The first water inlet port is connected with the second water outlet port and the third water inlet port in a communicating mode, and the first water outlet port is connected with the second water inlet port, so that urea is heated through hot water discharged from the engine and the urea is cooled through warm water discharged from the radiator. By means of the scheme, control can be performed according to the real-time temperature of the urea, so that the urea works at the appropriate temperature all the time, and the emission performance of a machine is guaranteed.
Description
Technical field
The present invention relates to the vent gas treatment field of a kind of engineering machinery motor vehicles, particularly relate to a kind of SCR Urea/cooling system and method.
Background technology
In current engineering machinery, along with the upgrading of discharge, especially Diesel engine lift-launch in excavator. At present, having been carried out meeting the ier4f electromotor of Ou Si discharge at European & American Market, for meeting emission regulation demands, most electromotors all adopt SCR system, and namely selective catalytic reduction system operating is to reduce the discharge of electromotor. Carbamide is a kind of tasteless nontoxic solution, in the urea tank being stored on diesel vehicle special configuration. After waste gas is got rid of from electromotor, it can arrive truck catalytic converter together with waste gas, and conversion of nitrogen oxides is harmless nitrogen and water by the ammonia then passing through pyrolytic generation, thus significantly lowering toxic emission. Carbamide is exclusively used in the indispensable catalytic reducer of Diesel engine SCR system. It is used to reduce the liquid of nitrogen oxides pollution in exhaust gas from diesel vehicle. Its constituent be 3.5% high-purity carbamide and 67.5% deionized water. SCR system includes urea tank (loading diesel engine vent gas treatment fluid), SCR catalytic reactor. Its running is: when finding to have nitrogen oxides in exhaustor, urea tank sprays diesel engine vent gas treatment fluid automatically, there is redox reaction in diesel engine vent gas treatment fluid and nitrogen oxides, generate free of contamination nitrogen and steam is discharged in SCR catalytic reactor.
In the excavator meeting ier4f discharge, it is necessary to using urea system, in system, the properly functioning of system is played key effect by the temperature of carbamide. Urea liquid in alkalescence, to copper, cast iron, solder, cast aluminium corrosivity very big, its operating temperature is not preferably greater than 50 DEG C, because easily cause the decomposition of carbamide more than 50 DEG C, reduces the performance of machine exhaust emissions; The temperature of carbamide also lower than-11 DEG C, because easily cause icing of urea solution lower than-11 DEG C, should not cause urea tube and urea tank blocking so that urea pump and urea nozzle cannot work, and affect the discharge function of machine tail gas.
Summary of the invention
It is an object of the invention to provide a kind of SCR Urea cooling system, solve above technical problem; The present invention also provides for a kind of Urea cooling means.
The present invention realizes by the following technical solutions:
A kind of SCR Urea/cooling system, is applied in urea tank that motor-vehicle tail-gas is processed, and described motor vehicles includes electromotor and radiator, and described heating/cooling system includes:
Heating-cooling coil, is arranged in described urea tank, and this heating-cooling coil has the first water inlet port and the first water outlet port; And
Described electromotor has the second water inlet port and the second water outlet port, described radiator has the 3rd water inlet port and the 3rd water outlet port, and described second water outlet port is intake with the described 3rd, and port through is connected, described 3rd water outlet port is intake with described second, and port is through to be connected, so that described electromotor to be dispelled the heat;
Wherein, described first water inlet port is intake with described second water outlet port and the described 3rd respectively, and port is through to be connected, described first water outlet port port of intaking with described second is connected, and the carbamide in described urea tank is lowered the temperature by the warm water that described radiator exports to utilize hot water that described electromotor exports that the carbamide held in described urea tank is heated or is utilized.
Preferably, the temperature of described hot water is higher than the temperature of described warm water.
Preferably, described heating/cooling system also includes: cooler, it is arranged between described 3rd water outlet port and described first water inlet port, lowers the temperature as cold water with the warm water that described radiator is exported, and utilize described cold water that the carbamide in described urea tank is lowered the temperature.
Preferably, the temperature of described warm water is higher than the temperature of described cold water.
Preferably, described heating/cooling system also includes:
First flow valve, is arranged between described 3rd water outlet port and described cooler, to control the flow of the warm water of described radiator output;
Second flow valve, is arranged between described second water outlet port and described first water inlet port, to control the flow of the hot water of described electromotor output.
Preferably, described heating/cooling system also includes: controller, electrically connects with the control end controlling end and described second flow valve of described first flow valve respectively.
Preferably, described heating/cooling system also includes:
Being arranged at the temperature sensor in described urea tank, described temperature sensor is connected with described controller, to obtain the real time temperature of carbamide in described urea tank;
Wherein, described controller storage has temperature threshold, to control the duty of described first flow valve and described second flow valve according to described real time temperature and described temperature threshold.
Preferably, described temperature threshold includes low temperature threshold and the high temperature threshold value higher than described low temperature threshold,
When described real time temperature is lower than described low temperature threshold, described second flow valve is opened and works;
When described real time temperature is higher than described high temperature threshold value, described first flow valve is opened and works;
Otherwise, described first flow valve and second flow valve keep state constant.
Preferably, described heating/cooling system also includes:
First three way cock, three ports of described first three way cock connect described 3rd water outlet port, first flow valve, the second water inlet port respectively;
Second three way cock, three ports of described second three way cock connect described second flow valve, cooler, the first water inlet port respectively.
Preferably, described heating-cooling coil is heating cooling spiral pipe.
Preferably, described radiator and cooler adopt the integrated module of integration mode.
A kind of excavator, including the SCR Urea/cooling system described in above-mentioned any one.
A kind of SCR Urea/cooling means, for the urea tank that motor-vehicle tail-gas is processed, described motor vehicles includes electromotor and radiator, and described carbamide is lowered the temperature by warm water that described radiator exports to utilize the hot water that described electromotor exports that described carbamide is heated or is utilized.
Preferably, preset low temperature threshold and high temperature threshold value, described low temperature threshold lower than described high temperature threshold value,
The real time temperature of detection carbamide;
If the real time temperature of described carbamide is lower than default low temperature threshold, described carbamide is heated by described electromotor output hot water;
If the real time temperature of described carbamide is higher than the high temperature threshold value preset, described carbamide is lowered the temperature by the warm water of described radiator output;
Otherwise, remain unchanged.
The scheme that the present invention proposes disclosure satisfy that Ou Si discharge and carries heating required in urea system in the engineering machinery of SCR system or excavator and cooling system, and has the advantages that
(1) can be controlled according to the real time temperature of carbamide, make carbamide always work at suitable temperature, it is ensured that the discharge performance of machine.
(2) because carbamide flow is little, under required heat dissipation capacity, less cooler can meet the requirement of system, therefore has the advantage that cost is low.
(3) it is particularly suited for the high area of ambient temperature and there is the machine of thermal source owing to carrying the caused urea tank adnexa of ier4f post processing space restriction.
(4) heating-cooling coil adopts heating cooling spiral pipe, increases heat-conducting area, shortens heating and the cool time of carbamide.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of SCR Urea/cooling system of the present invention.
In accompanying drawing, 1, electromotor; 2, second flow valve; 3, the second three way cock; 4, heating-cooling coil; 5, urea tank; 6, radiator; 7, the first three way cock; 8, first flow valve; 9, cooler; 10, controller; 11, temperature sensor.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments. Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under the premise not making creative work, broadly fall into the scope of protection of the invention.
It should be noted that when not conflicting, the embodiment in the present invention and the feature in embodiment can be mutually combined.
Below in conjunction with the drawings and specific embodiments, the invention will be further described, but not as limiting to the invention.
With reference to Fig. 1, a kind of SCR Urea/cooling system, including electromotor 1, equipped with the urea tank 5 of carbamide, for controlling the controller 10 of SCR Urea cooling system duty, also include the heating-cooling coil 4 being arranged in urea tank 5, this heating-cooling coil 4 has the first water inlet port and the first water outlet port, this heating-cooling coil 4 is heating cooling spiral pipe, and its heat-conducting area is big, it is possible to shorten the heating to carbamide and cool time. Electromotor 1 has the second water inlet port and the second water outlet port, radiator 6 has the 3rd water inlet port and the 3rd water outlet port, and second water outlet port and the 3rd water inlet the through connection of port, the 3rd water outlet port with second intake the through connection of port, so that electromotor 1 is dispelled the heat; Wherein, first water inlet port is intake with the second water outlet port and the 3rd respectively, and port is through to be connected, first water outlet port and the second water inlet port connect, and the carbamide in urea tank 5 is lowered the temperature by the warm water that radiator 6 exports to utilize hot water that electromotor 1 exports that the carbamide held in urea tank 5 is heated or is utilized. Cooler 9 is set between the 3rd water outlet port and the first water inlet port, lowers the temperature as cold water with the warm water that radiator 6 is exported, and utilize cold water that the carbamide in urea tank 5 is lowered the temperature. Wherein, the temperature of the hot water of electromotor 1 output is higher than the temperature of the warm water of radiator 6 output, and the temperature of the warm water of radiator 6 output is higher than the temperature of the cold water after the cooling of cooled device 9. Radiator 6 and cooler 9 can an integrated module, to reduce cost and to reduce the volume of whole system.
Installing first flow valve (flow valve 8) between the 3rd water outlet port and cooler 9, controller 10 electrically connects with first flow valve (flow valve 8), to control the flow of the warm water of radiator 6 output; Arranging second flow valve (flow valve 2) between the second water outlet port and the first water inlet port, controller 10 also electrically connects with second flow valve (flow valve 2), to control the flow of the hot water of electromotor 1 output. In addition, in order to make, the water in pipeline is more unobstructed must flow, arranging first three way cock (three way cock 7) between radiator 6, flow valve, electromotor 1, three ports of the first three way cock (three way cock 7) connect the 3rd water outlet port, first flow valve (flow valve 8), the second water inlet port respectively; Arranging second three way cock (three way cock 3) between electromotor 1, cooler 9 and heating-cooling coil 4, three ports of this second three way cock (three way cock 3) connect second flow valve (flow valve 2) respectively, cooler 9, first intakes port.
Urea tank 5 arranges a temperature sensor 11 electrically connected with controller 10, to detect the temperature of carbamide in real time. In controller 10, storage has two temperature thresholds, respectively low temperature threshold and high temperature threshold value, and low temperature threshold is lower than high temperature threshold value, usually, low temperature threshold is set to-11 ��, because water soluble urea crystalline temperature is-11 ��; High temperature threshold value is set to 50 ��, because easily cause the decomposition of carbamide more than 50 ��, reduces the performance of machine. When the real time temperature of carbamide is lower than low temperature threshold, second flow valve (flow valve 2) is opened, and first flow valve (flow valve 8) cuts out, and the hot water of electromotor 1 output is heated through heating cooler 9; When the real time temperature of carbamide is higher than high temperature threshold value, first flow valve (flow valve 8) is opened, and second flow valve (flow valve 2) cuts out, and the warm water of radiator 6 output is lowered the temperature through subcooler 9.
The operation principle of this SCR Urea/cooling system is: temperature sensor 11 detects the real time temperature of carbamide, when real time temperature is lower than low temperature threshold, when-11 ��, controller 10 controls and opens second flow valve (flow valve 2), close first flow valve (flow valve 8) and control heating-cooling coil 4 heats, the hot water being then out electromotor 1 second water outlet port flows through second flow valve (flow valve 2) successively, second three way cock (three way cock 3) and the heating-cooling coil 4 being located in urea tank 5, carbamide is heated, water after heating continues to flow into electromotor 1, so as to form a water circulation system, urea temperature after heating is controlled between-11 �㡫10 ��. when temperature is higher than high temperature threshold value 50 ��, controller 10 controls and opens first flow valve (flow valve 8) and cooler 9, close second flow valve (flow valve 2), and control heating-cooling coil 4 is operated in the state of cooling, the warm water of the 3rd water outlet port flowing out radiator 6 flows through the first three way cock (three way cock 7) successively, first flow valve (flow valve 8), cooler 9, second three way cock (three way cock 3) and heating-cooling coil 4, carbamide is lowered the temperature, water continues to flow into electromotor 1, form the water circulation system of a cooling, the temperature making carbamide controls between 30 �㡫50 ��. when real time temperature is between low temperature threshold and high temperature threshold value, system keeps original state constant.
Further comprises a kind of excavator, including above-mentioned SCR Urea/cooling system, be applied to the exhaust system of excavator.
Also include a kind of SCR Urea/cooling means, for the urea tank 5 that motor-vehicle tail-gas is processed, motor vehicles includes electromotor 1 and radiator 6, presets low temperature threshold and high temperature threshold value, wherein low temperature threshold is lower than high temperature threshold value, the real time temperature of detection carbamide; If the real time temperature of carbamide is lower than default low temperature threshold, carbamide is heated by electromotor output hot water; If the real time temperature of carbamide is higher than the high temperature threshold value preset, carbamide is lowered the temperature by the warm water of radiator 6 output; Otherwise, remain unchanged.
This programme can be controlled according to the real time temperature of carbamide, makes carbamide always work at suitable temperature, it is ensured that the discharge performance of machine; Adopt heating cooling spiral pipe, increase heat-conducting area, shorten heating and the cool time of carbamide.
The foregoing is only preferred embodiment of the present invention; not thereby restriction embodiments of the present invention and protection domain; to those skilled in the art; all utilizations description of the present invention and the made equivalent replacement of diagramatic content and the obtained scheme of apparent change should be can appreciate that, all should be included in protection scope of the present invention.
Claims (14)
1. SCR Urea/cooling system, it is characterized in that, being applied in urea tank (5) that motor-vehicle tail-gas is processed, described motor vehicles includes electromotor (1) and radiator (6), and described heating/cooling system includes:
Heating-cooling coil (4), is arranged in described urea tank (5), and this heating-cooling coil (4) has the first water inlet port and the first water outlet port; And
Described electromotor (1) has the second water inlet port and the second water outlet port, described radiator (6) has the 3rd water inlet port and the 3rd water outlet port, and described second water outlet port is intake with the described 3rd, and port through is connected, described 3rd water outlet port is intake with described second, and port is through to be connected, so that described electromotor (1) to be dispelled the heat;
Wherein, described first water inlet port is intake with described second water outlet port and the described 3rd respectively, and port is through to be connected, described first water outlet port port of intaking with described second is connected, and the carbamide in described urea tank (5) is lowered the temperature by the warm water that described radiator (6) exports to utilize hot water that described electromotor (1) exports that the carbamide held in described urea tank (5) is heated or is utilized.
2. SCR Urea/cooling system according to claim 1, it is characterised in that the temperature of described hot water is higher than the temperature of described warm water.
3. SCR Urea/cooling system according to claim 1, it is characterised in that described heating/cooling system also includes:
Cooler (9), it is arranged between described 3rd water outlet port and described first water inlet port, lower the temperature as cold water with the warm water that described radiator (6) is exported, and utilize described cold water that the carbamide in described urea tank (5) is lowered the temperature.
4. SCR Urea/cooling system according to claim 3, it is characterised in that the temperature of described warm water is higher than the temperature of described cold water.
5. SCR Urea/cooling system according to claim 3, it is characterised in that described heating/cooling system also includes:
First flow valve (8), is arranged between described 3rd water outlet port and described cooler (9), to control the flow of the warm water that described radiator (6) exports;
Second flow valve (2), is arranged between described second water outlet port and described first water inlet port, to control the flow of the hot water that described electromotor (1) exports.
6. SCR Urea/cooling system according to claim 5, it is characterised in that described heating/cooling system also includes:
Controller (10), electrically connects with the control end of described first flow valve (8) and the control end of described second flow valve (2) respectively.
7. SCR Urea/cooling system according to claim 6, it is characterised in that described heating/cooling system also includes:
Being arranged at the temperature sensor (11) in described urea tank (5), described temperature sensor (11) is connected with described controller (10), to obtain the real time temperature of carbamide in described urea tank (5);
Wherein, described controller (10) storage has temperature threshold, to control the duty of described first flow valve (8) and described second flow valve (2) according to described real time temperature and described temperature threshold.
8. SCR Urea/cooling system according to claim 7, it is characterised in that described temperature threshold includes low temperature threshold and the high temperature threshold value higher than described low temperature threshold,
When described real time temperature is lower than described low temperature threshold, described second flow valve (2) is opened and works;
When described real time temperature is higher than described high temperature threshold value, described first flow valve (8) is opened and works;
Otherwise, described first flow valve (8) and second flow valve (2) keep state constant.
9. SCR Urea/cooling system according to claim 6, it is characterised in that described heating/cooling system also includes:
First three way cock (7), three ports of described first three way cock (7) connect described 3rd water outlet port, first flow valve (8), the second water inlet port respectively;
Second three way cock (3), three ports of described second three way cock (3) connect described second flow valve (2), cooler (9), the first water inlet port respectively.
10. SCR Urea/cooling system according to claim 1, it is characterised in that described heating-cooling coil (4) is heating cooling spiral pipe.
11. SCR Urea/cooling system according to claim 3, it is characterised in that described radiator (6) and cooler (9) adopt the integrated module of integration mode.
12. an excavator, it is characterised in that include the SCR Urea/cooling system described in claim 1��11 any one.
13. SCR Urea/cooling means, it is characterised in that for the urea tank (5) that motor-vehicle tail-gas is processed, described motor vehicles includes electromotor (1) and radiator (6),
Described carbamide is lowered the temperature by warm water that described radiator (6) exports to utilize the hot water that described electromotor (1) exports described carbamide to be heated or utilizes.
14. SCR Urea/cooling means according to claim 13, it is characterised in that preset low temperature threshold and high temperature threshold value, described low temperature threshold lower than described high temperature threshold value,
The real time temperature of detection carbamide;
If the real time temperature of described carbamide is lower than default low temperature threshold, described carbamide is heated by described electromotor output hot water;
If the real time temperature of described carbamide is higher than the high temperature threshold value preset, described carbamide is lowered the temperature by the warm water that described radiator (6) exports;
Otherwise, remain unchanged.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107042080A (en) * | 2016-12-13 | 2017-08-15 | 珠海格力智能装备有限公司 | Urea machine |
| CN108979800A (en) * | 2018-07-12 | 2018-12-11 | 湖南响箭重工科技有限公司 | Hydraulic active cooling system applied to urea heating of SCR system and control method thereof |
| CN110456840A (en) * | 2019-09-12 | 2019-11-15 | 珠海格力智能装备有限公司 | Temperature value control method and device |
| CN110552769A (en) * | 2019-09-18 | 2019-12-10 | 山推工程机械股份有限公司 | Control method of tail gas aftertreatment system and tail gas aftertreatment system |
| CN112145261A (en) * | 2020-08-05 | 2020-12-29 | 中船澄西船舶修造有限公司 | Marine low-temperature self-cleaning urea cabin |
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