摘要
针对火电厂掺烧大量褐煤会导致磨煤机干燥出力不足,极大地影响制粉系统安全运行的问题,通过改变空气预热器转向、扩大一次风风仓角度和安装软密封对磨煤机喷嘴环进行了扩容改造.结果表明:改造后磨煤机入口热一次风温度进一步提高,干燥出力和研磨出力明显增大,风机阻力减小,在满足锅炉大比例掺烧褐煤要求的同时可降低风机电耗,减小一次风机失速的危险,为企业带来较大的经济效益.
Aiming at the problem that the co-combustion of a large amount of lignite in thermal power plants will cause inadequate drying capacity of coal mill and subsequently affect the safe operation of coal pulverizing system, a retrofit was implemented by changing the rotating direction of air preheater, increas- ing the angle of primary air chamber, mounting flexible seal to the air heater, and making capacity expan- sion to the mill nozzle, etc. Results show that after retrofit, the temperature of inlet hot primary air is fur- ther increased, the drying and milling capacity of coal mill are significantly raised, and the fan resistance is reduced on the basis of meeting the requirement of co-firing a large-proportion of lignite, the fan power consumption is reduced, the stalling risk of primary air fan is lowered, which will bring enormous econom- ic benefits to the enterprise.
出处
《动力工程学报》
CAS
CSCD
北大核心
2013年第5期335-339,共5页
Journal of Chinese Society of Power Engineering
关键词
空气预热器
褐煤
掺烧
设备改造
经济效益
air preheater lignite co-combustion
equipment retrofit economic benefit
