基于功率的汽轮机组实时热耗率计算方法  

A real-time monitoring model for heat consumption rate of steam turbine unit based on unit power

作　　者：翟兆银 王际洲[1] 李建兰[1] 陈刚[1] 

机构地区：[1]华中科技大学能源与动力工程学院,湖北武汉430074

出　　处：《热力发电》2015年第10期15-19,共5页Thermal Power Generation

基　　金：国家重点基础研究发展计划项目(973项目)(2015CB251504)

摘　　要：针对火电机组热耗率在线计算不准确的问题,提出了一种基于机组功率的实时热耗率计算方法:由机组热力性能试验数据获得汽轮机各缸性能特性,进而得出各加热器抽汽和进汽参数以及汽轮机低压缸效率;根据热平衡、能量守恒和质量平衡等基本原理,建立了基于发电机功率的热力系统模型;利用反平衡方法计算得到汽轮机各段抽汽流量和主蒸汽流量,从而得出机组实时热耗率。将该方法应用于某660MW机组的实时热耗率计算,并与厂级监控信息系统(SIS)计算的机组热耗率进行对比。结果表明,本模型计算的机组热耗率精度更高、稳定性更好,可为电厂热经济性的准确评价提供数据依据。In the view of the problem that the heat consumption rate calculation is inaccurate in present power plants,a new calculation method for real-time heat consumption rate based on power measurement is developed in this paper.Firstly,through the analysis of design data and thermal performance test results, the operating characteristics of steam turbine were obtained,and the extraction steam and entrance steam parameters of each heater were also obtained as well as the low pressure cylinder efficiency,which com-pletes the loss of field monitoring data.Secondly,the thermal system model of the power plant was estab-lished based on the power measurement,according to the principle of thermal equilibrium,material balance and energy conservation.To get the heat consumption rate in real time,the counterbalance method was em-ployed to calculate the extraction steam flow in different tubes and main steam flow rate without measuring the condensate flow.Finally,this method was applied on a 600 MW unit and the monitoring results were compared with that calculated by the SIS.The results show that this power-based model has high accuracy and stability in heat consumption rate calculation,which provides technical support for accurate evaluation of power plant thermal efficiency.

关 键 词：汽轮机组 实时热耗率 在线计算 功率 相邻抽汽压比 抽汽压损 低压缸效率 全工况模型 

分 类 号：TK113[动力工程及工程热物理—热能工程]