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Gas-assisted urea injection system and its electric purging method

A technology of a urea injection system and a urea tank, which is applied in the field of gas-assisted urea injection system and its power-down purging, can solve problems such as freezing and cracking of a urea dosing pump, and achieve the effects of reducing the failure rate and the risk of freezing and cracking.

Active Publication Date: 2020-06-26
WEICHAI POWER CO LTD +1
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, the existing air-assisted urea injection system only purges the urea in the mixing chamber, injection pressure pipe and nozzle of the urea pump after power off; while the internal flow channel and liquid return pipe of the urea pump are not purged, resulting in severe Risk of freezing and cracking of urea pump

Method used

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  • Gas-assisted urea injection system and its electric purging method
  • Gas-assisted urea injection system and its electric purging method

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Embodiment Construction

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0036] Air-assisted urea injection system: including urea pump, nozzle and compressed air filter and other components, the function is to measure and inject urea, and it is a device that injects urea, that is, the reducing agent, into the reactor according to a specified amount.

[0037] This embodiment provides a gas-assisted urea injection system, see figure 1 As shown, it includes: urea tank 11, liquid inlet 12, inlet check valve 13 of inlet chamber, outlet...

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Abstract

The invention provides a gas-aid type urea spraying system and a power-off purging method thereof. Under the low-temperature environment, after power-off, urea in a urea pump mixing cavity, a sprayingpressure pipe and a spraying nozzle is purged, urea in a urea pump passageway and a liquid return pipe is blown back to a urea tank, the frost-crack risk of a urea pump is reduced, and the failure rate of the urea pump is reduced. Furthermore, by optimizing the time durations of a first time section, a second time section and a third time section, urea cannot leak out of a vent hole under the pressure difference when the urea is blown back to the urea tank, and the failure rate of the urea tank is reduced.

Description

technical field [0001] The present invention relates to the technical field of SCR (Selective Catalytic Reduction technology, Selective Catalytic Reduction), and more specifically, relates to a gas-assisted urea injection system and an electric purging method thereof. Background technique [0002] At present, the most mainstream after-treatment technology for diesel engine exhaust is SCR. The main principle of SCR technology is to spray urea into the exhaust gas. Environmentally harmless nitrogen. [0003] The injection system is the core component in the SCR system. Mainstream injection systems include non-air-assisted urea injection systems and air-assisted urea injection systems. Compared with the non-air-assisted urea injection system, the air-assisted urea injection system has the advantages of better atomization effect. However, the existing air-assisted urea injection system only purges the urea in the mixing chamber, injection pressure pipe and nozzle of the urea ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N3/20F01N3/28
CPCF01N3/2066F01N3/2093F01N3/28F01N2610/02F01N2610/1406F01N2610/1473Y02T10/12
Inventor 安丽花李晓光郑志强赵龙龙
Owner WEICHAI POWER CO LTD
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