Modeling and Optimization for Single-Sequential Valve Switching Process Based on Reverse Segment Decoupling

doi:10.11930/j.issn.1004-9649.202004163

Abstract

Abstract: After long period of operation, the flow characteristics of governors in the generator unit may deviate gradually from its original values, thus the pre-set DEH parameter values are no longer in line with the actual flow characteristics. Eventually it will cause substantial load fluctuation during the single-sequential valve switching process, which will compromise the security of unit operation. This paper proposes the simplified modeling and related solution methods for the flow characteristics of governors, and then designs a flow characteristics optimization scheme based on reverse flow segments. Then the scheme is applied in a 320 MW circulating fluidized bed boiler for case studies and testing. The experimental results show that the matching degree of the flow characteristics under single-sequential valve operation mode has been greatly improved through the optimization of the governor parameters, such that the load fluctuation is effectively suppressed during the valve switching process.

Key words: steam turbine, flow characteristics, single-sequential valve switching process, reverse segment decoupling, modeling, optimization

QU Xiaohe, ZHUANG Yifei, ZHANG Xing, WU Haicheng, ZHANG Jian, LI Da. Modeling and Optimization for Single-Sequential Valve Switching Process Based on Reverse Segment Decoupling[J]. Electric Power, 2020, 53(12): 293-300.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202004163

https://www.electricpower.com.cn/EN/Y2020/V53/I12/293

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