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Steam temperature control method for boiler with big load variable rate and dedicated device thereof

A rate of change, steam temperature control technology, applied to controllers with specific characteristics, using electric mode for temperature control, control systems, etc., can solve problems such as boiler steam temperature disturbance, solve secondary overtemperature, improve average Response speed, the effect of overcoming large inertia

Inactive Publication Date: 2013-12-25
广州粤能电力科技开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The first purpose of the present invention is to provide a boiler steam temperature control method with a large load change rate in order to solve the problem that the basic fuel quantity change and the dynamic fuel quantity change cause disturbance to the boiler steam temperature under a large load rate

Method used

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  • Steam temperature control method for boiler with big load variable rate and dedicated device thereof
  • Steam temperature control method for boiler with big load variable rate and dedicated device thereof
  • Steam temperature control method for boiler with big load variable rate and dedicated device thereof

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specific Embodiment 1

[0033] see image 3 , the special-purpose device that the present embodiment adopts is formed by connection of differential module 1, state judgment and setting module 2, reset module 3 and reset holding and tracking module 4;

[0034] 1) The differential module 1 includes a feedforward differential circuit 11 and a high-low limiter circuit 12, the output end of the feedforward differential circuit 11 is connected to the input end of the reset module 3 through the high-low limiter circuit 12; the input terminal of the feedforward differential circuit 11 is connected with fuel Feedforward command output;

[0035]2) The state judgment and setting module 2 includes a load differential circuit 21, a load absolute value circuit 22, one of the rate multipliers, the second of the rate multipliers, a rate alarm 23, one of the delay breaking circuits and an AND gate circuit 24 ; One of the rate multipliers and two of the rate multipliers each have an input terminal connected to the ou...

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Abstract

The invention relates to a steam temperature control method for a boiler with big load variable rate and a dedicated device thereof. The method of the invention is characterized in that: 1) a feed forward control loop with a differential separation function is added in the DCS state of a machine set; 2) a feed forward output function and a feed forward pulse tracking function are respectively led into each overheating steam temperature control loop and reheating team temperature control loop, and feed forward actuating quantity of each steam temperature control loop can perform weighted adjustment according to the operation condition of the machine set. The dedicated device of the invention is formed by connecting a differential module, a state judgement and setting module, a resetting module and a resetting keeping and tracing module; wherein, the output end of the differential module is connected with the input end of the resetting module; the signal output end of the state judgement and setting module is connected with the signal input end of the resetting keeping and tracing module; the signal output end of the resetting module is connected with the signal input end of the resetting keeping and tracing module. The invention effectively solves the problem of secondary overheated temperature (low temperature) during the adjusting processes of boiler overheated steam temperature and reheating steam temperature for a boiler with big load rate.

Description

technical field [0001] The invention relates to a boiler steam temperature control method with a large load change rate and a special device. It belongs to the technical field of power plant equipment. Background technique [0002] In the prior art, for subcritical, intermediate reheating, and natural circulation coal-fired drum boilers, the steam temperature adjustment system includes a first-stage water spray temperature reduction regulation, a secondary water spray temperature reduction regulation, and a left reheat steam temperature adjustment system. Water spray adjustment, right reheat steam temperature spray water adjustment and burner swing angle adjustment system. In order to improve the adjustment performance of the unit control system and enable the unit to better meet the requirements of the AGC dispatching of the power grid, the power plant and the test unit jointly modified and improved the MCS logic of the unit. The problem of low average load rate and large...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F22B35/18G05D23/19G05B11/32G05B11/36
Inventor 黄卫剑
Owner 广州粤能电力科技开发有限公司
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