基于多变指数的汽轮机低压缸排汽焓在线计算方法  

Online Calculation Method of Exhaust Enthalpy for Low Pressure Steam Turbine Based on Polytropic Exponent

作　　者：王凯润 马素霞[1] 霍茂 WANG Kairun;MA Suxia;HUO Mao(College of Electrial and Power Engineering,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学电气与动力工程学院,太原030024

出　　处：《动力工程学报》2023年第11期1428-1433,1493,共7页Journal of Chinese Society of Power Engineering

基　　金：国家重点研发计划资助项目(2020YFB0606302)。

摘　　要：基于汽轮机变工况原理,提出了一种在线计算汽轮机排汽焓的新方法——多变指数法。通过考虑低压缸进汽流量、进汽温度、进汽压力和排汽压力对做功能力的影响,建立了低压缸做功多变指数模型,并采用多变指数法得出针对单个机组热力特性的精确模型以及适用于不同机组的改进通用模型。结果表明:由精确模型得到的排汽焓计算值与设计值的平均相对误差为0.165%,最大相对误差为0.738%;由改进通用模型得到的排汽焓计算值与设计值的平均相对误差为0.93%,最大相对误差为3.52%,可满足工程计算精度要求。Based on the principle of steam turbine under off-design operating condition,a new method was proposed to calculate steam turbine exhaust enthalpy online-polytropic exponent method.By considering the effects of inlet flow,inlet temperature,inlet pressure and exhaust pressure on low pressure(LP)steam turbine work ability,the polytropic exponent model of LP turbine work was established.An accurate thermodynamic model for a single unit and an improved general model for different units were obtained by using the polytropic exponent method.Results show that the average relative error between the calculated value of the accurate model and the design value is 0.165%and the maximum relative error is 0.738%,and the average relative error between the calculated value of the improved general model and the design value is 0.93%,and the maximum relative error is 3.52%,indicating that the proposed method can meet the accuracy requirement of actual engineering projects.

关 键 词：排汽焓 多变指数 在线计算 通用模型 

分 类 号：TK262[动力工程及工程热物理—动力机械及工程]