Energy-Saving Optimization of Steam Turbine DEH under Speed Control Mode

doi:10.11930/j.issn.1004-9649.201908014

Abstract

Abstract: Currently thermal power industry calls for the operation cost reduction, quality and efficiency improvement as well as energy-saving and emission reduction urgently. In this paper, the problems that have been existing in digital electric-hydraulic control system (DEH) speed control mode widely are discussed in terms of long start-up duration, inadequate warming-up process, difficult control over cylinder temperature rise rate, the complex operation, unstable speed and unsuccessful re-connecting to the grid in a short time after load rejection. Starting with the regulating valve and control mechanism of steam turbine, the heating process and dynamic process after load rejection are analyzed. By comparing the pros and cons of the existing techniques, the unreasonable settings of valve position function during the start-up process and the mismatch between DEH speed control mode and bypass valve characteristics after load rejection are concluded as the root causes of the above problems. At last, an optimization method of variable valve position function in steam turbine DEH speed control mode is proposed, which can realize automatic warming-up and fast grid-connection of the unit after load rejection. Therefore it can improve the security of the unit while maintaining its economic performance. In addition, the operators' workload is greatly reduced and their stress at work is relieved.

Key words: steam turbine, speed control mode, digital electro-hydraulic control system, energy-saving, warming-up

XU Zhangfu, DENG Tongtian, ZHONG Jingliang, WANG Suobin, ZHANG Shihai. Energy-Saving Optimization of Steam Turbine DEH under Speed Control Mode[J]. Electric Power, 2020, 53(4): 186-192.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.201908014

https://www.electricpower.com.cn/EN/Y2020/V53/I4/186

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