汽轮机调节阀和调节级特性建模与配汽优化  

Characteristic Model of Combined Governing Valve and Governing Stage and Optimization of Steam Distribution of Steam Turbine

作　　者：张浩峰 胥建群[1] 孙友源 黄喜军[1] 陈晓欣 皇甫泽玉 周丽丽[1] ZHANG Haofeng;XU Jianqun;SUN Youyuan;HUANG Xijun;CHEN Xiaoxin;HUANGFU Zeyu;ZHOU Lili(Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education,Southeast University, Nanjing 210096;Huadian EIectric Power Research Institute, Hangzhou 310030)

机构地区：[1]东南大学能源热转换及其过程测控教育部重点实验室,南京210096 [2]华电电力科学研究院有限公司,杭州310030

出　　处：《机械工程学报》2019年第18期165-172,共8页Journal of Mechanical Engineering

摘　　要：针对喷嘴配汽汽轮机,对调节阀和调节级联合进行建模,通过计算得到调节阀和调节级组合特性曲线,建立理论计算模型。该模型便于工程应用,利用调节阀和调节级组合的压比与阀门开度可计算得到准确的调节阀流量。基于计算模型,以某300 MW机组为研究对象,实现调节阀配汽函数的优化,并得到机组顺序阀流量特性;联合负荷和阀位,对其配汽方式进行优化。结果表明,经过验证调节阀和调节级的组合特性模型能够准确地反映现场调节阀特性。根据该模型实现流量特性的优化,得到合理的重叠度,提高阀门可控性;经过优化分析得到机组的最优滑压曲线,采用优化后的配汽方式运行,降低机组低负荷运行时的热耗,提高机组的灵活性和调峰能力。该优化方法对现场试验寻优提供理论基础。For the nozzle steam turbine, the combined flow characteristics calculation model of governing valve and governing stage is established by calculation, and tested with open literature experimental data. The accurate flow of the governing valve can be calculated with the model by using the combination pressure ratio and the valve opening, which is convenient for engineering application. Method a calculation model for the off-design performance of a 300 MW steam turbine unit based on the combined valve model, and the valve distribution function is optimized, and the flow character of the sequential valve is obtained. Then the steam distribution optimization is analyzed by using the load and valve position. Analysis shows that the combined flow characteristics calculation model of governing valve and governing stage can reflect the characteristics of the valve accurately. According to the model, the flow characteristic is optimized, the reasonable overlap degree is obtained. The optimal slip pressure curve of the unit is obtained, which reduce the heat consumption during low-load operation of the unit and improves the flexibility and peak-regulating capacity of the unit and provides the theoretical basis for optimization test.

关 键 词：变工况 调节阀 调节级 组合流量特性 配汽优化 

分 类 号：TK261[动力工程及工程热物理—动力机械及工程]