脱水污泥与秸秆掺烧及重金属迁移转化特性研究  

Migration characteristics of heavy metals during co-combustion of dehydrated sludge with straw

作　　者：郭帅 于士祥 车德勇[1] 刘洪鹏[1] 孙佰仲[1] GUO Shuai;YU Shi-xiang;CHE De-yong;LIU Hong-peng;SUN Bai-zhong(School of Energy and Power Engineering,Northeast Electric Power University,Jilin 132012,China;Zhejiang Energy Shaoxing Binhai Thermal Power Plant,Shaoxing 312073,China)

机构地区：[1]东北电力大学能源与动力工程学院,吉林吉林132012 [2]浙江浙能绍兴滨海热电有限责任公司,浙江绍兴312073

出　　处：《燃料化学学报》2022年第3期283-294,共12页Journal of Fuel Chemistry and Technology

基　　金：国家自然科学基金青年项目(51806033);吉林省自然科学基金(20190201096JC)资助。

摘　　要：在一台实验室规模的内循环流化床中,研究了700−850℃下脱水污泥与玉米秸秆的掺烧反应。目的是研究不同温度、污泥掺混比、二次风比率对掺烧后NO排放以及各种重金属在底灰、飞灰、烟气中迁移规律。结果表明,在实验工况下,随着温度升高,NO排放上升,底灰中V、Cr、As、Sb、Hg含量先增大后减小,Zn、Cu、Se、Cd与之相反,且大部分重金属的转折点在800℃;随着污泥掺混比的增加,NO排放先减少后增加,底灰中Cu、Hg、Tl含量均先增加后减小,Cr与之相反,且转折点均在污泥掺混比为10%时;随着二次风比率的增加,NO排放降低,底灰中重金属Zn、Cu、Se、Hg含量减少,As、Cd与之相反。Sludge incineration technology has significant advantages such as capacity reduction and energy utilization,but it will cause heavy metal pollution.Therefore,the co-combustion of dewatered sludge with corn straw at 700−850℃was studied in a laboratory scale internal circulating fluidized bed.The effects of different temperature,sludge mixing ratio and secondary air ratio on the NO emission and the migration of different heavy metals in bottom ash,fly ash and flue gas after co-combustion were examined.The results show that under the experimental conditions,with the increase in temperature,the NO emission concentration increases,and the concentrations of V,Cr,As,Sb and Hg first increase and then decrease in the bottom ash,while the concentrations of Zn,Cu,Se and Cd vary to the contrary.The turning point of most heavy metals concentration is at 800℃.However,with the increase in the sludge mixing ratio,the NO emission concentration first decreases and then increases,and the Cu,Hg and Tl concentrations all increase first and then decrease in the bottom ash,while the Cr concentration change is the opposite,with turning points all at the sludge mixing ratio of 10%.Also,with the increase in the secondary air ratio,the NO emission concentration decreases,and the Zn,Cu,Se and Hg concentrations in bottom ash decrease,on the contrary,the As and Cd concentrations increase.

关 键 词：燃料 污染 流化床 掺烧 重金属 

分 类 号：TK6[动力工程及工程热物理—生物能]