300MW煤粉锅炉燃烧产物中总铬和六价铬的分布特征研究  

STUDY ON CHROMIUM EXISTENCE AND DISTRIBUTION IN A 300MW PULVERIZED COAL FIRED UTILITY BOILER

作　　者：朱珍锦[1] 谈仪[1] 郑坚[1] 张长鲁[1] 李永光[1] 章德龙[1] 王启杰[1] 

机构地区：[1]上海电力学院动力工程系,上海200090

出　　处：《中国电机工程学报》2003年第4期167-171,共5页Proceedings of the CSEE

基　　金：上海市青年科技"启明星"计划项(99QG14011)

摘　　要：通过对某台300MW燃煤电站锅炉在额定负荷下的煤、渣、底灰、飞灰取样和总铬及Cr6+的定量测量,获得了煤在大型电站锅炉燃烧后铬的赋存形态及其分布的初步特征,并对燃烧产物中Cr6+的转化特性进行了探讨。煤在电站锅炉中燃烧时,从烟气中排放的总铬量占原煤总铬量的84％,而渣、底灰、电除尘一电场、二电场、三电场飞灰中总铬量分别占1.1％、0.6％、11.1％、1.2％、1.3％。即从锅炉中烟气中排放到周围环境中的燃烧产物铬的量占有相当大的份额。Through coal, slag, botton and fly ashes sampling from a 300MW utility boiler at the rated load and analysis of total and hexavalent chromium contents of those samples.the total chromium quantity distribution in coal and its combustion products was derived by means of mass balance methods. Characteristics of chromium transformation in a large-scale utility boiler is,therefore,analyzed and discussed. During coal combustion,the total chromium quantity in flue gas to raw coal is about 84% .The total chromium quantity in slag, bottom ash is about 1.1%, 0.6% respectively. The total chromium quantity in fly ashes can be distributed as 11.1% in No.l ESP outlet, 1.2% in No.2 ESP outlet, 1.3% in No.3 ESP outlet.In combustion products,the chromium in flue gas takes a very high ratio.

关 键 词：300MW煤粉锅炉 燃烧产物 铬 六价铬 分布特征 污染物 燃煤电厂 

分 类 号：X773[环境科学与工程—环境工程]