1913t/h超临界压力直流锅炉的优化调整试验  

Optimization Adjustment Tests on a 1913t/h Supercritical Pressure Once-through Boiler

作　　者：倪绍一[1] 

机构地区：[1]上海发电设备成套设计研究院,上海200240

出　　处：《发电设备》2013年第3期145-149,共5页Power Equipment

摘　　要：为提高锅炉热效率和各项运行性能指标,采用试验的方法获取了600 MW机组1 913t/h锅炉的大量运行数据,分析了锅炉吹灰方式、磨煤机出口风温、煤粉细度、排烟中氧气体积分数(O2)、分离燃尽风风门投运组合、二次风小风门开度等因素对锅炉热效率、排烟温度、飞灰含碳质量分数和NOx排放质量浓度的影响,并计算了有关因素的能损和收益。试验结果表明:该锅炉在600MW负荷时的最佳运行方案为炉膛每24h吹灰1次,水平烟道、后烟井和空气预热器每8h吹灰1次;磨煤机出口风温夏季设定80℃,冬季设定75℃;磨煤机动态分离器转速为650～700r/min;(O2)控制在3.4%～3.8%;分离燃尽风投运下面4层,偏置风门开度为35%。Abstract： To improve the thermal efficiency and performance indexes of a 1 913 t/h supercritical pressure once-through boiler, experimental tests were carried out, during which a large amount of operating data were obtained, so as to analyze the influence of following factors on the thermal efficiency, exhaust gas temperature, carbon content in fly ash and mass concentration of NOx emission of the boiler, such as the soot blowing mode, outlet air temperature of coal mill, fineness of pulverized coal, volume fraction ,（O2） of oxygen in exhaust gas, combination of separated overfire air （SOFA） doors in operation, and small opening of secondary air door, etc. Moreover, the energy loss and benefit of relevant factors were calculated. Results show that the optimal operation solution of the boiler at a load of 600 MW is as follows： carrying out soot blowing once every 24 h for the furnace, and once every 8 h for the horizontal flue gas duct, rear flue well, and air preheater; setting the coal mill outlet air temperature at 80 ℃ in summer and 75 ℃ in winter; setting the rotating speed of coal mill dynamic separator at 650-700 r/min; controlling 4（02 ） in 3.4% 3.8 % ; putting the lower four layers of SOFA into operation, and setting the opening of offset air door at 35 %.

关 键 词：超临界压力锅炉 热效率 排烟温度 NOx排放质量浓度 

分 类 号：TK227.1[动力工程及工程热物理—动力机械及工程]