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Reducing agent injection control method and device

A control method and technology of reducing agent, which are applied in the direction of muffler device, exhaust device, electronic control of exhaust gas treatment device, etc., can solve the problem of nozzle emission deterioration, etc., and achieve the goal of solving emission deterioration, reducing NOX concentration and improving NOX emission. Effect

Active Publication Date: 2019-10-01
WEICHAI POWER CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, this method of adding SCR tanks and nozzles will cause the problem of emission degradation caused by nozzle clogging.

Method used

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  • Reducing agent injection control method and device
  • Reducing agent injection control method and device
  • Reducing agent injection control method and device

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Embodiment Construction

[0062] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. 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.

[0063] Such as figure 1 As shown, a reducing agent injection control method provided in an embodiment of the present invention may include:

[0064] S100. Obtain the first NOx concentration at the outlet of the first SCR box and the second NOx concentration at the outlet of the second SCR box;

[0065] The first SCR box and the second SCR b...

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Abstract

The invention provides a reducing agent injection control method and device. The reducing agent injection control method comprises the following steps of: obtaining a first NOX concentration of an outlet position of a first SCR (selective catalytic reduction) tank and a second NOX concentration of an outlet position of a second SCR tank; if the degradation of the NOX discharge of the first SCR tank is determined based on the first NOX concentration and the second NOX concentration, adjusting the injection amount of a reducing agent of the first SCR tank at least two times based on the first NOX concentration, the second NOX concentration and the first injection amount of the reducing agent when the first SCR tank discharges the first NOX concentration. The reducing agent injection controlmethod and device can accurately locate the degraded SCR tanks, and reduce the NOX emission by adjusting the injection amount of the reducing agent of the degraded SCR tanks, and thus, when a nozzle is blocked, the emission degradation problem can be effectively solved by an injection amount adjustment manner, and further the NOX concentration in waste gases can be effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of equipment control, and more specifically relates to a reducing agent injection control method and device. Background technique [0002] At present, the exhaust gas emitted by the engine increases with the increase of the power speed of the engine. In order to reduce the NOX (nitrogen oxides) in the exhaust gas emitted by the engine, the exhaust gas emitted by the engine is equally divided and output to two SCR (Selective Catalytic Reduction, Selective Catalytic Reduction) box, and at least two nozzles are arranged on the SCR box, and a reducing agent (such as urea aqueous solution) is sprayed into the SCR box through the nozzles arranged on the SCR box, and the NOX concentration in the exhaust gas is reduced by the action of the reducing agent. [0003] However, this way of increasing the SCR tank and adding nozzles has the problem of emission degradation caused by clogging of the nozzles. Contents of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/20F01N11/00
CPCF01N3/208F01N11/00F01N2550/00F01N2560/026F01N2610/02F01N2610/146Y02T10/12Y02T10/40
Inventor 张硕王裕鹏朱娟闫立冰张淑宁张苏苏
Owner WEICHAI POWER CO LTD
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