摘要
采用自主设计的固定源细颗粒物稀释采集系统以及根据GB/T16157-1996方法对陕西关中地区某燃煤电厂湿电除尘器(WESP)进出口的颗粒物开展了现场实测与特性分析。结果表明:WESP对PM2.5、PM10和颗粒物的脱除效率分别为67.85%、43.57%、40.88%;WESP前后质量浓度峰值均出现在积聚模态,但由双峰(1.764、0.649μm)变成单峰(1.764μm),峰值移至大粒径段,数浓度峰值出现在爱根核模态和积聚模态,但由多峰(0.017、0.129、0.384、1.764μm)变成双峰(0.017、0.073μm),峰值移至小粒径段;经WESP,PM2.5积聚模态大多粒径段颗粒物的质量浓度与数浓度均在下降(如在质量浓度和数浓度下降粒径段中,0.129μm处下降率均最少(均为59.03%)),爱根核模态大多粒径段颗粒物的质量浓度与数浓度均在上升(如在质量浓度和数浓度上升粒径段中,0.017μm处上升率均最少(均为55.36%)),但无论是WESP前或后,PM2.5的主要质量浓度均集中在大粒径段、主要数浓度均集中在小粒径段;WESP对PM2.5中大粒径段颗粒物的去除效果要优于小粒径段颗粒物。
Field experiments and characteristic analysis of particles in flue gas from inlet and outlet of a coal-fired power plant using WESP in Guanzhong area of Shaanxi province was carried out according to GB/T 16157-1996 and the dilution and collection system of PM 2.5 in stationary sources designed by our team.The removal rates of PM 2.5,PM 10 and particles by WESP were 67.85%,43.57% and 40.88%,respectively.The peak of mass concentration before and after WESP appeared in the accumulation mode,but changed from two peak (1.764μm、0.649μm) to one peak (1.764μm),and the peak moved to large particle.The peak of number concentration appeared in Aitken mode and accumulation mode,but changed from multi peak (0.017μm、0.129μm、0.384μm、1.764μm) to two peak(0.017μm、0.073μm),and the peak moved to small particle.The mass concentration and number concentration of most particle size fractions in accumulation mode were decreasing(For example,the rate of descent at 0.129μm were the lowest (59.03%) in the decreasing particle size fractions of mass concentration and number concentration).The mass concentration and number concentration of most particle size fractions in Aitken mode are on the rise(For example,the rate of increase at 0.017μm were the lowest(55.36%) in the ascending particle size fractions of mass concentration and number concentration).However,the major mass concentration of PM 2.5 was concentrated in the large particle size,and the main number concentration was concentrated in the small particle size,either before or after the WESP for PM 2.5.The removal efficiency of WESP on large particles for PM 2.5 was better than that of small particles.
作者
杨建军
杜利劳
马启翔
林启才
YANG Jianjun;DU Lilao;MA Qixiang;LIN Qicai(School of Biological and Environmental Engineering,Xi' an University,Xi' an 710065,China;Shaanxi Research Academy of Environmental Sciences,Xi' an 710061,China)
出处
《环境保护科学》
CAS
2019年第3期45-50,共6页
Environmental Protection Science
基金
陕西省科技统筹创新工程计划课题(2012KTZB03-01)资助
