Migration and transformation of Pb,Cu,and Zn during co-combustion of high-chlorine-alkaline coal and Si/Al dominated coal  

作　　者：Jiangze Luo Qiwei Yang Jianqiao Wang Boxiong Shen Zhuozhi Wang Qiqi Shi Zhong Zhao Chao Huang Jie Xu 

机构地区：[1]Tianjin Key Laboratory of Clean Energy and Pollution Control,School of Energy and Environmental Engineering,Hebei University of Technology,Tianjin 300103,China [2]School of Chemical Engineering,Hebei University of Technology,Tianjin 300103,China

出　　处：《Journal of Environmental Sciences》2024年第7期26-39,共14页环境科学学报（英文版）

基　　金：supported by the Joint Funds of the National Natural Science Foundation of China(No.U20A20302);the Innovative group projects in Hebei Province(No.E2021202006);the project of Scientice and Technology in the Universities of Hebei Province(No.JZX2023006);the project of Scientice and Technology in the Shijiazhuang City of Hebei Province(No.216240117A);Project of great transformation of scientific and technical research in Hebei Province(No.21283701Z)。

摘　　要：Shaerhu(SEH)coal is abundant in Xinjiang,China.The utilization of SEH suffers from severe ash deposition,slagging,and fouling problems due to its high-chlorine-alkaline characteristics.The co-combustion of high-alkaline coal and other type coals containing high Si/Al oxides has been proven to be a simple and effective method that will alleviate ash-related problems,but the risk of heavy metals(HMs)contamination in this process is nonnegligible.Hence,the volatilization rates and chemical speciation of Pb,Cu,and Zn in co-combusting SEH and a high Si/Al oxides coal,i.e.,Yuanbaoshan(YBS)coal were investigated in this study.The results showed that the addition of SEH increased the volatilization rates of Pb,Cu,and Zn during the co-combustion at 800℃from 23.70%,23.97%,and 34.98%to 82.31%,30.01%,and 44.03%,respectively,and promoted the extractable state of Cu and Zn.In addition,the interaction between SEH and YBS inhibited the formation of the Pb residue state.SEM-EDS mapping results showed that compared to Zn and Cu,the signal intensity of Pb was extremely weak in regions where some of the Si and Al signal distributions overlap.The DFT results indicated that the O atoms of the metakaolin(Al_(2)O_(3)·2SiO_(2))(001)surface were better bound to the Zn and Cu than Pb atoms after adsorption of the chlorinated HMs.These results contribute to a better understanding of the effects of high-alkaline coal blending combustion on Pb,Cu,and Zn migration and transformation.

关 键 词：Heavy metals High-chlorine-alkaline coal Coal blending combustion Density functional theory 

分 类 号：X701[环境科学与工程—环境工程] TK227.1[动力工程及工程热物理—动力机械及工程]