1000 MW超超临界二次再热机组锅炉排烟温度高原因分析及调整  

Cause Analysis and Adjustment of High Exhaust Temperature of 1000 MW Ultra-Supercritical Secondary Reheat Unit Boile

作　　者：白健美 陈辉 BAI Jianmei;CHEN Hui(Shenmu Vocational and Technical College, Shenmu 719300, China;Guo Dian Science And Technology Research Institute, Nanjing 210031, China)

机构地区：[1]神木职业技术学院,陕西神木719300 [2]国电科学技术研究院有限公司,江苏南京210031

出　　处：《锅炉技术》2020年第6期54-57,共4页Boiler Technology

摘　　要：以TZ电厂3号1000 MW超超临界二次再热机组锅炉为研究对象,针对锅炉满负荷下排烟温度偏高原因进行分析和调整。经过理论计算和试验测量发现,磨煤机出口粉管一次风速偏高、磨煤机通风量偏大造成一次风占总风量比高偏高,约28.74%,大于设计值约7个百分点。一次风比例高造成一次风、二次风比例失调,空气预热器换热能力下降,进而造成锅炉排烟温度偏高。通过降低一次风母管压力约1.6 kPa,降低一次风率至24.64%左右,锅炉排烟温度降低约5.4℃,提高锅炉效率约0.3个百分点,影响煤耗约0.8 g/(kW·h),锅炉经济性明显提高,为同类型机组运行提供参考依据。Taking the boiler of NO.31000 MW ultra-critical secondary reheat unit in TZ power plant as the research object,the reasons for the high exhaust temperature of the boiler under full load are analyzed and adjusted.Through theoretical calculation and experimental measurement,it is found that the primary wind speed of the powder pipe at the outlet of the coal mill is on the high side,and the ventilation volume of the coal mill is too large,resulting in the high ratio of the primary air to the total air volume,which is about 28.74%,which is about 7%higher than that of the designer.The high proportion of primary air leads to the imbalance of the proportion of primary air and secondary air,and the heat transfer capacity of air preheater decreases,which leads to the high exhaust temperature of boiler.By reducing the primary air main pipe pressure by about 1.6 kPa,reducing the primary air rate to about 24.64%,reducing the boiler smoke exhaust temperature by about 5.4℃,increasing the boiler efficiency by about 0.3%,affecting the coal consumption about 0.8 g/(kW·h),the boiler economy is obviously improved,which provides a reference for the operation of the same type of unit.

关 键 词：超超临界二次再热 排烟温度 一次风率 一次风压 

分 类 号：TK229.2[动力工程及工程热物理—动力机械及工程]