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Feedforward control method for steam temperature of thermal power generating unit superheater/reheater

A thermal power unit, feedforward control technology, applied in the control of superheat temperature, steam superheat, steam generation and other directions, can solve the problems of lag deviation, abnormal state of steam temperature, etc., to achieve the effect of effective control

Active Publication Date: 2018-12-07
哈尔滨工业大学人工智能研究院有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims to solve the problem that the existing superheater / reheater steam temperature control method has hysteresis deviation in the control process of the steam temperature fluctuation caused by the disturbance of coal feed and steam flow, which leads to the problem that the steam temperature is often in an abnormal state

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  • Feedforward control method for steam temperature of thermal power generating unit superheater/reheater
  • Feedforward control method for steam temperature of thermal power generating unit superheater/reheater
  • Feedforward control method for steam temperature of thermal power generating unit superheater/reheater

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specific Embodiment approach 1

[0020] Specific implementation mode one: refer to Figure 4 Describe this embodiment in detail. The feedforward control method for the steam temperature of the thermal power unit superheater / reheater described in this embodiment is a feedforward control scheme for the set value of the outlet temperature of the desuperheater. There are three control loops in the control system, namely: the primary and secondary control loops of the cascade control, and the feedforward control loop. Among them, the main and auxiliary control loops are conventional control strategies, both of which adopt proportional integral (PI) control: the control object of the main controller is the outlet steam temperature of the superheater / reheater, and the auxiliary control loop and its control object are used as the actuator; The control object of the controller is the steam temperature at the outlet of the desuperheater, and the actuator is the spray valve of the desuperheater. details as follows:

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specific Embodiment approach 2

[0049] Specific implementation mode two: refer to Figure 5 Describe this embodiment in detail. The feedforward control method for the steam temperature of the thermal power unit superheater / reheater described in this embodiment is a feedforward control scheme for the set value of the outlet temperature of the desuperheater. There are three control loops in the control system, namely: the primary and secondary control loops of the cascade control, and the feedforward control loop. Among them, the main and auxiliary control loops are conventional control strategies, both of which adopt proportional integral (PI) control: the control object of the main controller is the outlet steam temperature of the superheater / reheater, and the auxiliary control loop and its control object are used as the actuator; The control object of the controller is the steam temperature at the outlet of the desuperheater, and the actuator is the spray valve of the desuperheater. details as follows:

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Abstract

The invention discloses a feedforward control method for steam temperature of a thermal power generating unit superheater / reheater, and relates to the field of control of the steam temperature of thethermal power generating unit superheater / reheater. The feedforward control method aims to solve the problem that according to an existing control method of the steam temperature of the superheater / reheater, in the process of controlling steam temperature fluctuation caused by coal feeding amount and steam flow disturbance, the lag deviation exists, so that the steam temperature is always in an abnormal state. According to the feedforward control method, according to the coal feeding amount signal and the main steam / superheated steam flow signal, a comprehensive disturbance signal of the influence caused by coal feeding amount and steam flow disturbance on the superheater / reheater steam temperature is designed, the comprehensive disturbance signal is used as an input signal of a temperature reducer outlet temperature feedforward controller or a temperature reducer water spraying valve opening feedforward controller, a feedforward control signal is obtained, the feedforward control signal is used for adjusting a temperature reducer outlet temperature setting value or a temperature reducer water spraying valve opening so as to adjust the actual steam temperature value of the outlet of the superheater / reheater.

Description

technical field [0001] The invention belongs to the field of steam temperature control of superheaters / reheaters of thermal power units. Background technique [0002] Superheater / reheater steam temperature control is an important link to improve the operating economy and ensure safety of thermal power units. Keeping the superheater / reheater steam temperature within the rated range is of great significance to the safe and economical operation of the unit. [0003] However, in the actual operation of power plants, the fluctuation of superheater / reheater steam temperature is a common problem. When the steam temperature of the superheater / reheater is too high, it will damage the heating surface. When the steam temperature of the reheater is low, it will increase the humidity of the final stage of the steam turbine, which will affect the safe operation of the unit. However, the relationship between steam temperature and operating parameters is often difficult to determine, espec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F22G5/12F22G5/20
Inventor 刘金福周永诚孔令辉程江南刘鑫陈罗魏凡超王福宁任博文秦爱社邹学明张大峰马辉刘振明王宇亮朱伟
Owner 哈尔滨工业大学人工智能研究院有限公司