CAJ | 학술논문

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660 MW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。
침대화전궤조열모솔재선계산불준학적문제，제출료일충기우궤조공솔적실시열모솔계산방법：유궤조열력성능시험수거획득기륜궤각항성능특성，진이득출각가열기추기화진기삼수이급기륜궤저압항효솔；근거열평형、능량수항화질량평형등기본원리，건립료기우발전궤공솔적열력계통모형；이용반평형방법계산득도기륜궤각단추기류량화주증기류량，종이득출궤조실시열모솔。장해방법응용우모660 MW궤조적실시열모솔계산，병여엄급감공신식계통(SIS)계산적궤조열모솔진행대비。결과표명，본모형계산적궤조열모솔정도경고、은정성경호，가위전엄열경제성적준학평개제공수거의거。
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.