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Supercritical boiler fire coal heat value self-balance control loop distributed control system implementation method

A decentralized control system and supercritical boiler technology, applied in electrical program control, comprehensive factory control, etc., can solve the problems of long system stability, inability to construct heat signals, large fluctuations in operating parameters of the unit, etc., to improve operating stability and efficiency. economical effect

Active Publication Date: 2014-12-24
ANHUI XINLT POWER TECH CONSULTING +3
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  • Application Information

AI Technical Summary

Problems solved by technology

However, supercritical once-through boilers have small energy storage and cannot construct heat signals similar to drum boilers. In its indirect energy balance coordinated control scheme, fuel calorific value disturbances are usually corrected by closed-loop main steam pressure. This passive correction method eliminates deviations Weak, especially in the condition of AGC with continuous and large load changes, the accumulated deviation will lead to long system stabilization time and large fluctuations in unit operating parameters

Method used

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  • Supercritical boiler fire coal heat value self-balance control loop distributed control system implementation method
  • Supercritical boiler fire coal heat value self-balance control loop distributed control system implementation method
  • Supercritical boiler fire coal heat value self-balance control loop distributed control system implementation method

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Embodiment Construction

[0048] The implementation platform of this application example is the Emerson OVATION DCS (distributed control) system.

[0049] Such as figure 1 As shown, a supercritical boiler coal-fired calorific value self-balancing control loop decentralized control system implementation method, the method is realized in the automatic control environment, including: the received coal amount instruction and the calorific value corrected total The coal quantity command outputs the final coal feeder speed command through PI adjustment 59; where:

[0050] The coal feed amount command is the coal feed forward amount sent by the target load through the coal feed feed forward generator 54, and the closed loop control amount given by the closed loop controller 55 formed by the main steam pressure setting value and the main steam pressure Coal supply command output after adding 56;

[0051] The total coal quantity instruction after the calorific value correction is the total coal quantity instr...

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Abstract

The invention discloses a supercritical boiler fire coal heat value self-balance control loop distributed control system implementation method. The method comprises the steps of outputting a final coal feeder rotation speed command after PID adjustment is carried out on a received coal feed quantity command and a total coal quantity command with a heat value corrected, wherein the total coal quantity command with the heat value corrected is a total coal quantity command output by multiplying a dynamically-measured total coal feed quantity by a heat value balance correction coefficient, and the heat value balance correction coefficient is a delayed heat value balance correction coefficient. According to the method, soft measurement of a fire coal heat value can be achieved based on a unit DCS platform, additional investment is not needed, and a soft measurement signal of the fire coal heat value makes it convenient for operating personnel to monitor the quality of fired coal in real time and guides boiler combustion adjustment. A fire coal heat value self-balance control loop is designed, and therefore a unit coordinated control system has the ability to adapt to various types of coal, and the operation stability and the economy of a unit are improved.

Description

technical field [0001] The invention belongs to the thermal engineering measurement field of a thermal power plant, and in particular relates to a method for realizing a decentralized control system (DCS) of a self-balancing control loop of a supercritical boiler coal-fired calorific value. Background technique [0002] At present, power plant boilers have various coal sources and seriously deviate from the designed coal types. In order to reduce fuel costs, power generation companies continue to increase coal blending efforts. Affected by factors such as blending sites and blending plans, coal blending and blending The uniformity is difficult to be effectively controlled, and the calorific value of the furnace coal changes frequently, which affects the coordinated control performance of the unit, and even brings hidden dangers to the safe operation of the boiler. [0003] In the direct energy balance coordinated control scheme of the drum boiler, the heat signal represents ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/418
Inventor 施壮秦志明蔡兵黄德保蔡伟程仁海高俊查贵庆
Owner ANHUI XINLT POWER TECH CONSULTING
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