烟气排放连续监测系统测点气相流场分析

Gas flow field analysisof the continuous emission monitoring system(CEMS) measuring point

华电天津军粮城发电有限公司#9机组出口烟道烟气排放连续监测系统(CEMS)测点前烟道直管段长度不符合HJ/T75—2007《固定污染源烟气排放连续监测技术规范(试行)》的要求,提出了在CEMS测点前弯头处布置导流板的优化措施。优化后的数值模拟结果显示:CEMS测点处截面最大烟气流速约为23m/s,最小烟气流速约为19m/s,截面烟气流速与标准的偏差约为6.4%(小于标准要求的7.0%),整个烟道的阻力仅增加9Pa,节能效果良好,可保证场地条件受限的电厂能满足环保监测的要求。

Since the front flue straight length of the outlet flue continuous emission monitoring system(CEMS) measuring point in unit 9 of Huadian Tianjin Junliangcheng Power Generation Company Limited does not meet the relative requirement in HJ/T75-2007 Specifications for Continuous Emissions Monitoring of Flue Gas Emitted from Stationary Sources(On Trial),guide plate is installed at the elbow before CEMS measuring point as an optimized measure.The optimized numerical simulation results show that the section flue gas velocity at CEMS measuring point has a deviation of around 6.4%with the standard requirement(less than the standard deviation 7.0%),with a maximum value about 23m/s and a minimum value around 19m/s;while,the resistance of the entire flue only increases 9 Pa and the energy-saving effect is good as well.Thus,this optimized measure enables the power plants with restricted site conditions to meet the environmental monitoring requirements.