Optimization of the Steam Temperature Control System Based on the Flow Characteristic Compensation of Desuperheating Water Regulating Valve

doi:10.11930/j.issn.1004-9649.2016.10.022.06

Abstract

Abstract: The regulation quality of the steam temperature control system is of great importance to the safety and economical operation of thermal generation units. Particularly, the flow characteristics of the governing valve actuator directly affect the regulation quality of the control system. In this paper, through the analysis on the flow static characteristics of linear, equal percentage and parabolic valves and in combination with the tuning of the control system and parameters, it is concluded that the linear governing valve can maintain the regulation quality unchanged at different valve openings, which is good for the improvement of the control system stability. To improve the linearity degree of the governing valve in practical operation, the flow characteristic compensation principles and the calculation methods are put forward. Taking a 660-MW subcritical thermal generation unit for example, the flow characteristics of the A/B governing valves are calculated with the historic data of position and flow, and the flow compensation is applied in the steam temperature control loops. The unit operation result indicates that the regulation quality of the superheated temperature control loops is substantially improved. Finally, it is suggested that the flow characteristic compensation and correction of the valves should be taken regularly as part of the equipment maintenance.

Key words: thermal generation unit, control system, governing valve, flow characteristics, compensation, optimization, superheated steam temperature

CLC Number:

TK268.1

HUANG Weijian, LI Yibo, WAN Wenjun. Optimization of the Steam Temperature Control System Based on the Flow Characteristic Compensation of Desuperheating Water Regulating Valve[J]. Electric Power, 2016, 49(10): 22-27.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.2016.10.022.06

https://www.electricpower.com.cn/EN/Y2016/V49/I10/22

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