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Selective catalytic reduction system

A selective and reducing agent technology, applied in the direction of mechanical equipment, engine components, machines/engines, etc., can solve the problems of cleaning the complex structure of the pump and increasing the cost, and achieve the effects of reducing energy consumption, reducing costs, and shortening the emptying time

Active Publication Date: 2016-04-06
BOSCH AUTOMOTIVE DIESEL SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the cleaning pump has a very complex structure, which leads to an increase in the cost of the entire selective catalytic reduction system

Method used

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Embodiment Construction

[0025] The preferred embodiments of the present application are described below with reference to the drawings.

[0026] figure 2 A selective catalytic reduction system according to an embodiment of the present application is shown, which is used to inject a reducing agent into the exhaust gas of an engine, especially a diesel engine, at a certain pressure and metered flow. The reducing agent may be a commonly used urea solution, such as AdBlue, which is stored in the reducing agent tank 1.

[0027] The selective catalytic reduction system includes a reducing agent supply line, which includes a pipeline or channel (reducing agent supply channel) L1 starting from the reducing agent tank 1 and sequentially arranged in the channel L1 from the side close to the reducing agent tank 1. In the pre-filter 2, the main pump module 3, the main filter and pressure pulse damping module 4, the channel L1 terminates in a metering injection module carried by the exhaust pipe of the engine (the ov...

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PUM

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Abstract

A selective catalytic reduction system comprises a reducing agent tank, a metering and spraying module, a reducing agent supply line, a compressed air source, an auxiliary air line and a reducing agent cleaning line, wherein the metering and spraying module comprises a reducing agent metering valve and a reducing agent spraying channel; the reducing agent supply line is connected between the reducing agent tank and the metering valve; the auxiliary air line operates together with the reducing agent supply line; the upstream end of the auxiliary air line is connected with the compressed air source, and the downstream end of the auxiliary air line leads to an outlet of the reducing agent spraying channel, so that compressed air from the compressed air source is sprayed towards reducing agent flow; the upstream end of the reducing agent cleaning line is connected with the compressed air source, the downstream end of the reducing agent cleaning line leads to the reducing agent spraying channel, the reducing agent cleaning line is controlled to operate after operation of the reducing agent supply line and operation of the auxiliary air line are finished so that compressed air from the compressed air source can be sprayed towards the metering valve, and residual reducing agents in the metering valve are forced to return towards the reducing agent tank. The selective catalytic reduction system can reduce the cost and shorten the cleaning time of the residual reducing agents.

Description

Technical field [0001] The present application relates to a selective catalytic reduction (SCR) system for after-treatment of engine exhaust gas, which has a reductant cleaning module for returning reductant after operation. Background technique [0002] In order to reduce harmful components in vehicles, current vehicles are usually equipped with appropriate exhaust gas aftertreatment systems to reduce the amount of harmful gases emitted by the engine. For example, a selective catalytic reduction system is an effective engine exhaust aftertreatment system that reduces NOx in the exhaust gas by more than 50% by injecting a urea solution as a reducing agent into the exhaust pipe of a vehicle. [0003] After the engine runs, the exhaust system temperature drops, and the urea solution crystallizes or freezes at low temperatures, which can cause problems. For example, a 32.5% urea aqueous solution used as a standard reducing agent will freeze at an ambient temperature below -11°C. Aft...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/28F01N3/20
CPCY02T10/12
Inventor 肖斌
Owner BOSCH AUTOMOTIVE DIESEL SYST