垃圾焚烧飞灰中重金属高温挥发工艺特性研究  

Study on effect of CaCl_2 on heat treatment of MSWI fly ash

作　　者：田书磊[1,2] 王琪[2] 胡小英[2] 金晶[3] 王伟[1] 

机构地区：[1]清华大学环境科学与工程系,北京100084 [2]中国环境科学研究院,北京100012 [3]西南大学环境科学与工程系,重庆400716

出　　处：《哈尔滨商业大学学报（自然科学版）》2009年第4期399-403,共5页Journal of Harbin University of Commerce：Natural Sciences Edition

基　　金：中国博士后基金(023205030);国家自然科学基金(20577047)

摘　　要：试验采用温州某城市生活垃圾焚烧厂飞灰为原料,对飞灰中重金属挥发工艺的特性进行了高温热处理研究,主要探讨了温度、时间、载气等工艺参数对重金属的挥发效果的影响,并优化了工艺参数.试验运行结果表明,温度和时间是影响重金属挥发的最主要参数,在以空气为载气（进气流量600mL/m in）的条件下,其最优参数分别为1 000~1 050℃和120 m in,此时重金属Cd和Cu挥发率分别为89.7%和77.9%,Zn仅为53.2%,而Pb高达99.7%;载气气氛对重金属挥发率的贡献率较小;除Pb外,各重金属挥发率均随着飞灰样品厚度的增加而呈显著下降趋势.A heat-treat experiment is carried out to test the volatilization characteristics of heavy metals in municipal solid waste incinerator （MSWI）fly ash, which is taken from a municipal solid waste incineration plant in Wenzhou, intending to know the efficacy of the heat- treatment temperature, time and gas carrier on the evaporation of heavy metals in fly ash, and optimizes the process parameters. Test results show that the heat-treat temperature and time are the most important parameters in this experiment. On the air as carrier gas （ inlet air flow 600 mL/min） condition, the optimal parameters are 1 000 - 1 050℃and 120 min, the evaporation of Cd and Cu are 89.7% and 77.9% , Zn is only 53.2% , and Pb up to 99. 7 %. The effect of different kinds of gas carriers on heavy metals evaporation is indistinetive. Except the Pb, the evaporation rate of all heavy metals decreases significantly with the fly ash sample thickness increasing.

关 键 词：垃圾焚烧飞灰 重金属 挥发 

分 类 号：X705[环境科学与工程—环境工程]