摘要
针对电站锅炉直吹式制粉系统一次风精细化实时优化调整问题,基于光学互相关测速原理,研制了电站锅炉一次风速在线测量系统,将其应用于神华江苏国华陈家港发电有限公司660MW 2号机组,测量得到了所有煤粉管内风粉速度,并与已有压差测速对比,相对偏差小于15%,验证了测量的准确性。此外,基于该测量结果计算了同层燃烧器总一次风量,较现有一次风量测量结果偏大20%左右,据此通过降低一次风机工作电流以减小一次风量。结果显示直吹式制粉系统运行正常,氮氧化物浓度降低,节约了电厂运行成本。
For the fine real timely optimizing adjustment of primary air for direct firing pulverizing system of utility boiler, the online primary air measurement system for utility boiler based on optical cross-correlation method was developed. And this system was applied to Unit 2 with 660 MW of Shenhua Jiangsu Guohua Chenjiagang Power Generation Co., Ltd. The velocities of gas-solid two phase flow in all pulverized coal pipes were measured and compared with the measurements of differential pressure method, the relative deviation is less than 15 percent, and the measurement accuracy is validated. Furthermore, the total mass flows of primary air at same burner layer were calculated based on the measurements, and the results are bigger than 20 percent of the measurements based on existing dynamic pressure method. Accordingly the working current of the primary air fan was reduced to decrease mass flow, and the result shows that the direct firing pulverizing system runs normally, and the emission of NOx is reduced, so the operation cost of power station is saved.
出处
《锅炉技术》
北大核心
2017年第3期6-10,共5页
Boiler Technology
基金
上海市科委科研计划项目(13DZ2260900)
上海高校青年教师培养资助计划项目(ZZslg15002)
关键词
直吹式制粉系统
实时优化调整
一次风速
光学互相关
在线测量
direct firing pulverizing system
real timely optimizing adjustment
primary air velocity
optical cross-correlation method
online measurement
