SNCR denitration control method and device for circulating fluidized bed unit and storage medium

A circulating fluidized bed and control method technology, applied in the field of denitrification treatment, can solve problems such as stable control of NOx emissions

Active Publication Date: 2020-10-30
YANTAI LONGYUAN POWER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing SNCR control logic generally uses a PID controller to adjust the total amount of ammonia injection for feedback control. This...

Method used

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  • SNCR denitration control method and device for circulating fluidized bed unit and storage medium
  • SNCR denitration control method and device for circulating fluidized bed unit and storage medium
  • SNCR denitration control method and device for circulating fluidized bed unit and storage medium

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Experimental program
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Embodiment 1

[0059] This embodiment is to provide a circulating fluidized bed unit SNCR denitrification control method, such as figure 1 As shown, the circulating fluidized bed unit SNCR denitrification control method includes the following steps:

[0060] S100. Oxygen volume control: design an oxygen volume control model predictive controller with the total air volume of the secondary air as the control variable, the total coal volume as the disturbance variable, and the oxygen content in the flue gas as the controlled variable. According to the oxygen volume control The output of the model predictive controller controls the opening of the secondary fan baffle door;

[0061] Specifically, fuel (such as coal) and air enter the furnace for mixed combustion. Ideally, the combustibles in the coal are completely combusted with the oxygen in the air, and the oxygen content in the generated flue gas is 0. When the amount of oxygen entering the furnace When it is insufficient, it is easy to caus...

Embodiment 2

[0113] Embodiment 2 of the present invention is also to provide an SNCR denitrification control device for a circulating fluidized bed unit. The SNCR denitrification control device for a circulating fluidized bed unit may include but not limited to: one or more processors and a memory connected to the processors .

[0114] As a computer-readable storage medium, the memory can be used to store software programs, computer-executable programs and modules, such as program instructions corresponding to the SNCR denitrification control method of the circulating fluidized bed unit in the embodiment of the present invention. The processor implements the SNCR denitrification control method for the circulating fluidized bed unit as described above by running the SNCR denitrification control program for the circulating fluidized bed unit stored in the memory. The SNCR denitrification control method for the circulating fluidized bed unit includes:

[0115] S100. Oxygen volume control: des...

Embodiment 3

[0119] Embodiment 3 of the present invention also provides a computer-readable storage medium on which is stored a circulating fluidized bed unit SNCR denitrification control program. When the circulating fluidized bed unit SNCR denitrification control program is executed by a processor, the above-mentioned circulating fluidized bed A unit SNCR denitrification control method, the circulating fluidized bed unit SNCR denitrification control method includes:

[0120] S100. Oxygen volume control: design an oxygen volume control model predictive controller with the total air volume of the secondary air as the control variable, the total coal volume as the disturbance variable, and the oxygen content in the flue gas as the controlled variable. According to the oxygen volume control The output of the model predictive controller controls the opening of the secondary fan baffle door;

[0121] S200. Denitrification control: design a denitrification control model predictive controller wi...

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PUM

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Abstract

The invention discloses an SNCR denitration control method and device for a circulating fluidized bed unit and a storage medium. The method comprises the following steps: S1, oxygen amount control: designing an oxygen amount control model prediction controller by taking the total air amount of secondary air as a control variable, the total coal amount as an interference variable and the oxygen content in flue gas as a controlled variable, and controlling the opening degree of a baffle door of a secondary air fan according to an output result of the oxygen amount control model prediction controller; and S2, denitration control: designing a denitration control model prediction controller by taking the total ammonia spraying amount as a control variable, taking the NOx concentration of the clean flue gas as a controlled variable and taking the oxygen content in the flue gas as an interference variable, and controlling the opening degree of an ammonia spraying valve according to an outputresult of the denitration control model prediction controller. The fluctuation range of the NOx generation amount under the variable load working condition can be reduced through oxygen amount controloptimization, oxygen amount measuring points serve as feedforward control through denitration control optimization, the delay time of a control system can be shortened, and the ammonia spraying amount can be saved through combination of the oxygen amount control optimization and the denitration control optimization.

Description

technical field [0001] The invention relates to the technical field of denitration treatment, in particular to a method and device for controlling SNCR denitration of a circulating fluidized bed unit, and a storage medium. Background technique [0002] Boiler Selective Non-Catalytic Reduction (SNCR) denitrification technology has the advantages of low investment, low operating cost, and small amount of boiler modification, and has been applied in various boilers. The SNCR denitrification technology does not use a catalyst, and the reducing agent such as ammonia gas, ammonia water, urea dilute solution, etc. is sprayed into the flue gas at 850-1150°C to directly reduce NO, and the reducing agent rapidly thermally decomposes into NH 3 And react with NOx in flue gas to generate N2 and H 2 O. The spray gun of the SNCR denitrification system of the circulating fluidized bed unit is usually installed in the horizontal flue at the separator inlet. The SNCR denitrification system...

Claims

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Application Information

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IPC IPC(8): B01D53/56B01D53/34
CPCB01D53/56B01D53/346
Inventor 隋海涛王立凯姚明伟赵超唐建华蔡芃杨进福姚建超王金武大伟苏阳吴楠邓超金晓灵陈冲刘银李智统王发科
Owner YANTAI LONGYUAN POWER TECH
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