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Control system and method for boiler denitration outlet nitrogen oxide content

A nitrogen oxides and control system technology, applied in various fluid ratio control, controllers with specific characteristics, electric controllers, etc. The effect of eliminating adverse effects

Active Publication Date: 2016-07-20
NORTHWEST BRANCH OF CHINA DATANG CORP SCI & TECH RES INST
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Problems solved by technology

[0004] In view of the problems in the prior art, the purpose of the present invention is to provide a control system and method for controlling the nitrogen oxide content at the boiler denitrification outlet, which can solve the problems of large delay and large inertia in the existing denitrification system

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  • Control system and method for boiler denitration outlet nitrogen oxide content
  • Control system and method for boiler denitration outlet nitrogen oxide content

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Embodiment Construction

[0040]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.

[0041] An embodiment of the present invention provides a control system for the content of nitrogen oxides at the boiler denitrification outlet, such as figure 1 As shown, the control system includes: an SCR reactor, a primary PID controller, a secondary PID controller and a Smith predictor, and the primary PID controller and the secondary PID controller are controlled in a cascade connection.

[0042] The output end of the main PID controller is connected to t...

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Abstract

The invention belongs to the field of thermal generator set flue gas denitrification control technologies, and discloses a control system and a control method for boiler denitration outlet nitrogen oxide content. The control system comprises an SCR reactor, a main PID controller, an auxiliary PID controller and a Smith predictor, wherein the main PID controller and the auxiliary PID controller adopt a cascade connection method for control; an output end of the main PID controller is connected with an input end of the Smith predictor, an output end of the Smith predictor acts on an input end of the main PID controller; and the main PID controller controls nitrogen oxide concentration of an outlet of the SCR reactor, and the auxiliary PID controller controls ammonia spraying flow entering the SCR reactor. The control system and the control method can solve the problems of large delay and great inertia of the existing denitration system.

Description

technical field [0001] The invention belongs to the technical field of flue gas denitrification control of thermal power generating units, and in particular relates to a control system and method for controlling the nitrogen oxide content at a boiler denitrification outlet. Background technique [0002] Due to the characteristics of large delay and large inertia of the boiler denitrification ammonia injection control system, the change of nitrogen oxide concentration at the denitrification outlet cannot reflect the disturbance suffered by the system in time. [0003] At present, the automatic adjustment quality of most conventional PID (proportion-integration-differentiation, proportional-integral-differential) controller cascade denitrification and ammonia injection control systems is not ideal, and there are problems of large overshoot and long adjustment time. Contents of the invention [0004] In view of the problems in the prior art, the object of the present inventio...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05D11/13G05B11/42
CPCG05B11/42G05D11/13
Inventor 赵宇邹包产韩秋喜李云陈鹏原
Owner NORTHWEST BRANCH OF CHINA DATANG CORP SCI & TECH RES INST
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