Identifying and Standardized Setting Method of Overlap Degree of DEH System Regulating Valve

doi:10.11930/j.issn.1004-9649.201907017

Abstract

Abstract: According to the principle of steam turbine, the connotation and function of the overlap degree of the regulating valve of DEH system are analyzed in-depth with the overlapping measurement indices established. Then the stepping safety limit of the valve position is determined and verified as the critical constraint affecting the adjustment of the valve overlap. Moreover, an applicable valve overlap identification and normalization setting method with broader spectrum is proposed in high compliance with the established valve sequence characteristics, which is separated from the pressure overlap and closely related to the valve position of the regulating valve. The simulation and field tests have verified that the method meets the requirements for the linearity of the inlet flow in the overlap area of the regulating valve, the operation security of the DEH system as well as the need to reduce the throttling loss under the valve point operating condition.

Key words: steam turbine, regulating valve, flow characteristics, overlap, throttling loss

WAN Zhonghai, CHEN Wen, CAI Wen, LU Jin, YAN Tao. Identifying and Standardized Setting Method of Overlap Degree of DEH System Regulating Valve[J]. Electric Power, 2020, 53(2): 156-163.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.201907017

https://www.electricpower.com.cn/EN/Y2020/V53/I2/156

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