燃煤电厂烟气湿度控制对PM_(2.5)采样结果的影响  

EFFECT OF HUMIDITY CONTROL OF FLUE GAS FROM COAL-FIRED POWER PLANTS ON PM_(2.5)SAMPLING

作　　者：韩东航 李振 闫雨龙 彭林 李博韬 周永乾 师小龙 程宇栋 HAN Donghang;LI Zhen;YAN Yulong;PENG Lin;LI Botao;ZHOU Yongqian;SHI Xiaolong;CHENG Yudong(MOE Key Laboratory of Resources and Environmental System Optimization,School of Environmental Science and Engineering,North China Electric Power University,Beijing 102206,China;Engineering Research Centre of Clean and Low-Carbon Technology for Intelligent Transportation,Ministry of Education,School of Environment,Beijing Jiaotong University,Beijing 100091,China)

机构地区：[1]华北电力大学环境科学与工程学院资源环境系统优化教育部重点实验室,北京102206 [2]北京交通大学环境学院智能交通绿色低碳技术教育部工程研究中心,北京100091

出　　处：《环境工程》2023年第12期158-165,277,共9页Environmental Engineering

基　　金：国家自然科学基金项目(22106044,21976053);中央高校基本科研业务费专项资金(2021MS035)。

摘　　要：为研究脱硫后高湿烟气相对湿度的改变对颗粒物采样结果的影响,使用扩散干燥管对烟气进行除湿,并分析不同相对湿度下PM_(2.5)的粒径分布、传输损失和质量浓度变化。结果显示,模拟烟气湿度越高,PM_(2.5)粒数浓度和质量浓度也随之升高。40%相对湿度下,模拟烟气中ρ(PM_(2.5))为22.77 mg/m^(3),粒数浓度约为1.16×10^(6)个/cm^(3),模拟烟气湿度提升至50%、60%和80%时,ρ(PM_(2.5))分别升高1.06,4.35,4.69倍,粒数浓度分别升高1.31,1.70,1.76倍;使用扩散干燥管对模拟高湿烟气除湿,采集到的颗粒物质量浓度有不同程度的下降,最高相对湿度(94.9%)下,ρ(PM_(2.5))为27.17 mg/Nm^(3),湿度81.4%、68.5%、48.7%和30.4%时,质量浓度相比最高湿度时分别降低了14.5%、28.8%、43.0%和45.7%;烟气除湿可降低PM_(2.5)在管路内和切割头内的损失,在94.9%、81.4%和68.5%相对湿度下采集到的ρ(PM_(2.5))分别是对照组的3.02,2.73,2.57倍。高湿烟气除湿降低了颗粒物的含水率,使得PM_(2.5)的质量浓度测量结果随着除湿强度增加而降低,但因除湿降低了颗粒物损失,相比对照组最终采集到的PM_(2.5)质量浓度随着除湿强度增加而显著提升。In order to investigate the effect of relative humidity(RH)of high humidity flne gas after desulfurization on the sampling results of PM_(2.5)concentration from coal-fired power plants,the diffusion dryers were used to control the RH of the flue gas.Particle size distribution,particle loss,and PM_(2.5)mass concentration were determined with a variety of RHs.The results show that a higher RH of the flue gas led to an increase in the number and mass concentration of PM_(2.5).For the RH of 40%,the mass concentration of PM_(2.5)was 22.77 mg/m^(3) and the total number concentration of PM_(2.5)was 1.16×10^(6) P/cm^(3).As the RH of the flue gas increased to 50%,60%,and 80%,the mass concentration of PM_(2.5)increased by 1.06,4.35,4.69 times;and the number concentration was increased by 1.31,1.70,1.76 times,respectively.When using a diffusion drying tube to dehumidify the simulated high-humidity flue gas,the mass concentration of particles collected decreased to varying degrees.At the highest relative humidity(94.9%),the mass concentration of PM_(2.5)was 27.17 mg/Nm^(3),and at the humidity of 81.4%,68.5%,48.7%,30.4%,the mass concentration was 14.5%,28.8%,43.0%,45.7%lower than that at the highest humidity.Flue gas dehumidification reduced the loss of PM_(2.5)in the pipeline and the cutting heads.The mass concentration of PM_(2.5)collected at relative humidity of 94.9%,81.4%,68.5%was 3.02,2.73,2.57 times higher than that of the control group.High humidity flue gas dehumidification reduced the moisture content of particulate matter,resulting in a lower measurement result of PM_(2.5)mass concentration.However,due to the reduction of particulate matter loss,the final collected PM_(2.5)mass concentration was significantly increased.

关 键 词：燃煤电厂 烟气湿度 细颗粒物(PM_(2.5))采样 扩散干燥管 粒径分布 颗粒物损失 

分 类 号：X773[环境科学与工程—环境工程]