燃煤电厂冲灰水系统防垢技术研究  

STUDY OF SCALE INHIBITION IN ASH WATER OF POWER STATION

作　　者：唐永明[1] 陈敏[1] 杨文忠[1] 尹晓爽[1] 刘瑛[1] 俞斌[1] 王锦堂[1] 

机构地区：[1]南京工业大学理学院,南京210009

出　　处：《环境化学》2006年第4期485-487,共3页Environmental Chemistry

基　　金："十五"国家科技攻关项目(No:2004BA313B14)

摘　　要：研究了粉煤灰在水中的溶解行为,结果表明:(1)灰水混合液在不同转速下搅拌20m in后,pH值、电导率、碱度、Ca2+浓度等指标不再明显变化;(2)向混合液中加入Na2CO3可有效降低Ca2+的浓度,而且Na2CO3的投加量与Ca2+浓度之比(摩尔比)为0.8∶1时,混合液中Ca2+即可降至15mg.l-1以下;(3)向灰水分离后的清液中通入CO2(6m in)可将全部碱性物质转化为HCO-3,并溶入大量CO2,用此水冲灰可达到与投加Na2CO3相似的效果.The dissolution behavior of coal ash was studied, and in order to reduce concentration of Ca^2＋ in composite solution of ash and water, Na2CO3 was added. CO2 was aerated in the solution after ash was separated, and new ash was dissolved again. It was found that ： 1 ） pH, conductance, alkalinity and Ca^2＋ achieved stability after composite solution was stirred for 20min ; 2） Concentration of Ca^2＋ in composite solution was reduced by addition of Na2CO3, and when the mol ratio of Na2CO3 and Ca^2＋ was 0. 8： 1, concentration of Ca^2＋ was reduced to less than 15 mg · l^-1; 3） All alkalinity was converted to HCO3-, and CO2 was dissolved in the solution in which ash was separated after CO2 was aerated for 6min. The effect of CO2 on ash dissolution resembled of Na2CO3.

关 键 词：冲灰水 结垢 碳酸钠 二氧化碳. 

分 类 号：TM621[电气工程—电力系统及自动化]