Gas-liquid stirring and mixing device of urea solution metering injection system

An injection system, gas-liquid mixing technology, applied in the direction of exhaust devices, silencers, mechanical equipment, etc., can solve problems affecting the work of the injection system, deposition crystallization, injection pipeline blockage, etc., to avoid blocking the air inlet, stirring and mixing Good effect, the effect of solving the problem of crystallization

Inactive Publication Date: 2011-07-06
SUZHOU POWERGREEN EMISSION SOLUTION SYST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Affected by factors such as the structure of the mixing chamber, air pressure, blowing direction, urea injection volume and temperature, the actual effect is not ideal, the suspension is not uniform enough, and deposition and crystallization tend to occur in the mixing chamber, which may cause blockage of the injection pipeline in severe cases
[0005] In addition, in actual work, due to the sudden interruption of compressed air, the residual liquid in the pipeline is not purged, and the backflow of liquid in the pipeline may also cause crystallization and blockage, affecting the normal operation of the injection system

Method used

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  • Gas-liquid stirring and mixing device of urea solution metering injection system
  • Gas-liquid stirring and mixing device of urea solution metering injection system
  • Gas-liquid stirring and mixing device of urea solution metering injection system

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Embodiment Construction

[0017] In order to understand the technical content of the present invention more clearly, the following examples are given in detail.

[0018] Such as figure 1 , figure 2 As shown, the purification system using the present invention mainly includes a liquid storage tank 1, a pumping element 2, a filter regulator 4, a metering valve 5 and a mixing chamber 6. The device 4, the metering valve 5 and the mixing chamber 6 are connected in series with pipelines. There is a reducing agent (aqueous urea solution) in the liquid storage tank. The pumping element 2 pumps the reducing agent into the metering valve 5 through the pipeline. The filter 4 pairs The reducing agent plays the role of filtering and stabilizing the pressure. The metering valve 5 performs metered injection of the reducing agent, and the compressed air 6 in the mixing chamber stirs and mixes the injected reducing agent, and blows it to the nozzle in the form of a suspension (not shown in the figure). ), and spraye...

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PUM

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Abstract

The invention relates to a gas-liquid stirring and mixing device of a urea solution metering injection system, comprising a metering valve, a compressed air inlet, a mixing cavity and an injection outlet, wherein the metering valve injects a reducing agent; the mixing cavity is used for gas-liquid stirring and mixing; the compressed air inlet is arranged on the side wall of the mixing cavity and tangent to the inner wall of the mixing cavity; and the injection outlet is arranged at the bottom of the mixing cavity. The invention has ingenious design, ensures good uniformity of a stirred and mixed suspension and can effectively solve the problems of deposition and crystallization inside the mixing cavity.

Description

technical field [0001] The invention relates to a post-treatment and purification system for diesel vehicle exhaust, in particular to a gas-liquid stirring and mixing device in a urea solution metering injection system. Background technique [0002] With the continuous improvement of motor vehicle emission standards, vehicle exhaust purification systems have increasingly attracted the attention of motor vehicle manufacturers, and various technical routes have gradually matured. [0003] It is now known that selective catalytic reduction technology (SCR) is a main way to reduce NOx emissions from diesel vehicles, that is, the reducing agent (urea aqueous solution) is atomized and quantitatively injected into the exhaust pipeline, and then undergoes a series of physical and chemical reactions. , Convert the main harmful gas NOx in the exhaust gas into nitrogen and water to discharge, so as to achieve the purpose of exhaust gas purification. Among them, the transportation of u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/20B01D53/94
Inventor 郝庆军
Owner SUZHOU POWERGREEN EMISSION SOLUTION SYST
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