燃煤过程中砷的迁移转化及控制技术综述  

Review of Arsenic Transformation and Emission Control During Coal Combustion

作　　者：龚泓宇 胡红云[1] 刘慧敏 李帅 黄永达 付彪 罗光前[1] 姚洪[1] GONG Hongyu;HU Hongyun;LIU Huimin;LI Shuai;HUANG Yongda;FU Biao;LUO Guangqian;YAO Hong(State Key Laboratory of Coal Combustion(Huazhong University of Science and Technology),Wuhan 430074,Hubei Province,China)

机构地区：[1]煤燃烧国家重点实验室(华中科技大学),湖北省武汉市430074

出　　处：《中国电机工程学报》2020年第22期7337-7351,共15页Proceedings of the CSEE

基　　金：国家重点研发计划项目(2018YFB0605103)。

摘　　要：砷是煤中广泛存在的一种高挥发性的有毒重金属元素。我国大量的煤炭燃烧是砷的主要人为排放源之一,因此控制燃煤过程中砷的排放至关重要。综述了燃煤过程中砷的迁移转化行为,包括煤中砷的赋存形态、燃煤过程砷的释放特性及燃煤产物中砷的分布,重点阐释了燃煤产生细颗粒物中砷的尺度及形态分布特性。进一步,基于炉型选择和添加剂技术提出了炉内砷强化控制技术,根据烟气净化装置对不同尺度及形态含砷颗粒物的捕集特性,分析了炉后控制技术对颗粒物与砷的协同脱除作用,旨在为燃煤电厂砷及其他挥发性重金属的排放控制提供参考。Arsenic is a highly toxic and easily volatile element that is widely distributed in coal. As one of the main anthropogenic sources of arsenic emission in China, it is essential to gain knowledge on the fate of arsenic during coal combustion and search for possible arsenic control strategies. In this review, the occurrence of arsenic in coal, the release behavior of arsenic in coal combustion process and its distribution in the combustion by-products were summarized, with special focus on the partitioning behavior of arsenic in size-segregated fine ash particles. Furthermore, the in-furnace control strategies of arsenic based on the selection of furnace type and additives were discussed, followed by the collaborative control of particulate matters and arsenic in the post-combustion stage by air pollution control devices. It is expected to provide reference for the emission control of arsenic as well as the other volatile heavy metals in power plants.

关 键 词：燃煤 砷 迁移转化 炉内控制 炉后控制 

分 类 号：TK411[动力工程及工程热物理—动力机械及工程]