中国电力 ›› 2020, Vol. 53 ›› Issue (2): 156-163.doi: 10.11930/j.issn.1004-9649.201907017

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DEH系统调节阀重叠度辨识及规范化整定方法

万忠海, 陈文, 蔡文, 鲁锦, 晏涛   

  1. 国网江西省电力有限公司电力科学研究院, 江西 南昌 330096
  • 收稿日期:2019-07-01 修回日期:2019-07-25 出版日期:2020-02-05 发布日期:2020-02-05
  • 作者简介:万忠海(1975-),男,高级工程师,从事电厂汽轮机试验与节能工作,E-mail:wzhjjch@163.com

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

WAN Zhonghai, CHEN Wen, CAI Wen, LU Jin, YAN Tao   

  1. State Grid Jiangxi Electric Power Company Electric Power Research Institute, Nanchang 330096, China
  • Received:2019-07-01 Revised:2019-07-25 Online:2020-02-05 Published:2020-02-05

摘要: 依据汽轮机原理,深入剖析了DEH系统调节阀重叠度的内涵及功能,建立了重叠度量化指标,确定并验证了阀位步进安全限幅是影响调节阀重叠度整定的关键性约束条件,提出了一种严格遵照既定阀序特性并脱离于压力重叠度且密切关联调节阀阀位的更为广谱适用的调节阀重叠度辨识及规范化整定方法。经仿真及现场试验验证,该方法满足调节阀重叠区域进汽流量线性度、DEH系统安全运行以及降低阀点工况节流损失的需求。

关键词: 汽轮机, 调节阀, 流量特性, 重叠度, 节流损失

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