Method and device for controlling temperature of SCR reactor

A technology of SCR reactor and control method, which is applied in the direction of noise reduction device, exhaust device, electric control of exhaust gas treatment device, etc., can solve the problems of overshoot or slow response speed, unstable temperature of SCR reactor, etc. Hysteresis, improve stability, improve the effect of response speed

Active Publication Date: 2014-11-05
WEICHAI POWER CO LTD
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Problems solved by technology

[0005] In order to solve the temperature instability in the SCR reactor and the problems of overshoot or slow respo

Method used

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  • Method and device for controlling temperature of SCR reactor
  • Method and device for controlling temperature of SCR reactor
  • Method and device for controlling temperature of SCR reactor

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Embodiment Construction

[0041] The specific implementation of the method for controlling the temperature of the SCR reactor provided by the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0042] see figure 1 , figure 1 It is a schematic flow chart of the method for controlling the temperature of the SCR reactor provided by the embodiment of the present invention. Such as figure 1 As shown, the control method includes the following steps:

[0043] S101. According to the experimental test temperature before the SCR reactor and the two-point method with delayed first-order inertia link fitting, construct the SCR dynamic temperature model, and the SCR dynamic temperature model contains a hysteresis link:

[0044] Usually, the post-injection of the engine is used in this technical field to control the exhaust temperature of the engine exhaust, but the SCR reactor is usually located after the oxidation catalytic device DOC and the par...

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Abstract

The invention provides a method and device for controlling the temperature of an SCR reactor. The method for controlling the temperature of the SCR reactor includes the steps that an SCR dynamic temperature model is established according to the experimental measurement temperature before the SCR reactor and a two-point method with a delay first-order inertia link fitting function; a Smith predictor is used for conducting calculation to obtain a compensation value according to the characteristics of the SCR dynamic temperature model; the compensation value can eliminate a lag link in the SCR dynamic temperature model; a difference value obtained by subtracting the sum of output of the SCR dynamic temperature model and the compensation value from the preset temperature of the SCR reactor is calculated; a feedback signal containing the difference value is received, the rear fuel injection quantity of an engine is calculated according to the difference value, a signal containing the rear fuel injection quantity of the engine is sent to the engine, and the engine is controlled to conduct rear injection according to the rear fuel injection quantity so as to control the temperature of the SCR reactor. According to the method, the stability of control over the temperature of the SCR reactor is improved.

Description

technical field [0001] The invention relates to engine tail gas treatment technology, in particular to a method and device for controlling the temperature of an SCR reactor. Background technique [0002] In order to reduce the nitrogen oxides in engine exhaust emissions, the most effective way at present is to carry out selective catalytic reduction reaction (SCR reaction) on the exhaust gas of the engine, so that the nitrogen oxides in the exhaust gas react with urea to form ammonia and water, thereby reducing emissions to nitrogen oxides in the atmosphere. [0003] During the SCR reaction, the catalytic efficiency of the catalyst in the SCR reactor has a great relationship with the temperature in the SCR reactor. If the temperature in the SCR reactor is too high or too low, the catalytic efficiency of the SCR reaction will be reduced. Therefore, in order to ensure the catalytic efficiency of the SCR reaction, the temperature in the SCR reactor should be controlled within ...

Claims

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Application Information

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IPC IPC(8): F01N9/00F01N3/20
CPCY02T10/12Y02T10/40
Inventor 蔺海艳刘兴义王金平闫立冰
Owner WEICHAI POWER CO LTD
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