超临界压力直流锅炉炉膛受热面壁温监测预报系统  

Online Temperature Monitoring and Forecasting System for Evaporating Tube Wall in Supercritical Boilers

作　　者：刘福国[1] 辛本权 冷成岗 周新刚[1] 吕贵存 胡志宏[1] 姜波[1] 

机构地区：[1]山东电力研究院,山东济南250002 [2]华电邹县发电厂,山东邹城273522

出　　处：《中国电力》2013年第4期6-10,15,共6页Electric Power

基　　金：山东电力集团公司科技项目(2011C-27超临界压力直流锅炉水冷壁蒸发受热面超温预报研究)

摘　　要：超临界压力直流锅炉蒸发受热面壁温监测主要依靠布置在炉膛外的少量热电偶,炉内管壁温度缺乏有效的监测手段。通过对超临界压力直流锅炉蒸发受热面传热、炉膛热流量分布、蒸发管参数建模以及受热管内强制对流沸腾换热的模拟,实现了全炉膛蒸发受热面管壁温度和燃煤发热量的在线测量。开发的超临界压力直流锅炉炉膛受热面壁温监测预报系统在一台1 000 MW应用成功。采用试验方法测试了系统的性能,结果表明,炉外壁温的测量值与预测值的偏差在-2.47%～+3.83%,煤收到基低位发热量的监测误差在-6.99%～+5.32%。Monitoring of evaporating tube wall temperature mainly relies on a certain number of thermocouples outside the furnace and it lacks effective methods inside the furnace. Through the modeling of wall heat transfer, furnace heat flux distribution and tube dimension as well as the simulation of forced convective boiling heat transfer in the wall tubes, online measurement of the whole-furnace evaporating wall temperatures and the firing coal calorific value is achieved with a monitoring and forecasting system successfully developed and applied for a 1 000-MW supercritieal boiler. The performance tests on the system are carried out, which show that the difference between the on-line monitoring value and the value measured by the thermocouples ranges from -2.47% to ＋3.83% and the error of the on-line monitoring of the coal low calorific value on as-received basis ranges from -6.99% to ＋5.32%.

关 键 词：超临界压力直流锅炉 炉膛 壁温监测和预报 煤质在线测量 

分 类 号：TK229.2[动力工程及工程热物理—动力机械及工程]