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Selective catalyst reduction (SCR) urea tank for after-treatment of exhaust gas of diesel engine

A technology of exhaust post-treatment and urea tank, which is applied in the direction of exhaust devices, mechanical equipment, engine components, etc., can solve the problems of high price and complex system, reduce system cost, simplify system structure, improve measurement accuracy and The effect of stability

Inactive Publication Date: 2011-04-20
FAW GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the mature urea solution supply and injection systems are all produced by foreign companies. Some adopt diaphragm pump structure, and some adopt gear pump structure. supplier

Method used

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  • Selective catalyst reduction (SCR) urea tank for after-treatment of exhaust gas of diesel engine
  • Selective catalyst reduction (SCR) urea tank for after-treatment of exhaust gas of diesel engine
  • Selective catalyst reduction (SCR) urea tank for after-treatment of exhaust gas of diesel engine

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Embodiment Construction

[0009] Below in conjunction with accompanying drawing, the present invention will be further described, as shown in Figure 1, a kind of SCR urea tank that is used for aftertreatment of exhaust gas of diesel engine, comprises tank body 5, valve seat 15, charging solenoid valve 7, urea filling valve 6 , the urea outlet valve 23, the deflation solenoid valve 14, the urea pipe 2 in the tank that is set in the tank, it is characterized in that: the urea tank is a pressure vessel tank, the bearing pressure is 1.0MPa, and the upper end of the urea pipe 2 in the tank body 5 is fixed on The urea outlet valve 4 is connected to the urea outlet pipe 9, and the valve seat 15 is also equipped with a temperature sensor 17, a liquid level sensor 16, a heating pipe 19, and a pressure sensor 18, and a discharge port 1 is installed at the bottom of the urea tank.

[0010] The urea solution in the tank body 5 is kept at about 0.8 MPa under the action of air pressure, and the pressure in the urea t...

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Abstract

The invention relates to a selective catalyst reduction (SCR) urea tank for after-treatment of exhaust gas of a diesel engine, belonging to a purification system of exhaust gas of an internal combustion engine. The invention is characterized in that the urea tank is a pressure container tank, the bearing pressure is 1.0MPa, the upper end of a urea tube in the tank body is fixed on a urea outlet valve and is communicated with a urea outlet tube, a temperature sensor, a liquid level sensor, a heating tube and a pressure sensor are also installed on a valve seat, and a drain opening is installed at the bottom of the urea tank. The SCR urea tank provides a urea solution with stable pressure for a pneumatic SCR urea jet system, obviously improves the metering accuracy and stability of the jet amount of the urea solution, and has the advantages of simple structure, low cost and good practical value.

Description

technical field [0001] The invention relates to an SCR urea tank for aftertreatment of diesel engine exhaust, in particular to a urea tank for a selective catalytic reduction system SCR (Selective Catalyst Reduction) used to reduce NOx emissions from diesel engines, which belongs to the exhaust gas purification system of internal combustion engines. Background technique [0002] For the emissions of motor vehicles, people use various methods to eliminate the harmful substances contained in them. SCR technology is a very effective method of reducing NOX compounds. Engine SCR post-treatment technology is to spray reducing agent urea solution into engine exhaust. Under the action of exhaust gas temperature and air flow, urea can quickly decompose and release ammonia, and reduce NOX into nitrogen to achieve the effect of reducing NOX. Because urea solution has the advantages of stable performance, simple chemical reaction, and relatively small amount of reducing agent, it has b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/24B01D53/94B01D53/56
CPCY02T10/24Y02T10/12
Inventor 李骏邢喜春戈非吴君华朱宏志张鹏李冠霖张慧英朱双艳尹燕升马力张亮纪英王向征贾招远范家政
Owner FAW GROUP
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