摘要
针对云南小龙潭矿区褐煤及燃烧产物中重金属元素As、Cd、Sb、Pb、Hg的含量,通过室内模拟燃烧,研究了5种元素在煤燃烧过程中的分布行为,揭示了它们在燃煤产物中的分配富集特征,分析了这些元素产生的环境影响.结果表明,Hg的挥发性最强,在300℃下就有极高的挥发率,到500℃挥发殆尽,挥发性为Hg>As>Cd>Sb>Pb,而重金属的赋存状态对其挥发性有明显的影响.最后通过环境效应评价其燃烧过程的挥发对大气的影响发现在室内模拟燃烧下属重污染,这与室内试验挥发率较大有关,而电厂动态燃烧下为微污染,所以燃烧方式以及燃烧工况等对微量重金属的挥发性有明显的控制作用.
Concentrations of heavy metals, e.g. arsenic, cadmium, antimony, lead and mercury, in lignite and combustion products of Xiaolongtan mine in Yunnan were analyzed. Based on the laboratory experiment, the distribution characteristics of these five heavy metals in combustion product were identified and their environmental impacts were estimated. It was found that the volatility of mercury was the strongest. It showed extremely high volatile rate in 300℃ , and can volatile completely in 500℃. The order of volatility was Hg 〉 As 〉 Cd 〉 Sb 〉 Pb, and the mode of occurrences of heavy metals had a significant impact on their volatility. Through the environmental impact assessment of the five heavy metals during coal combustion, heavy pollution was recorded in the laboratory combustion while only light pollution was recorded in power plant combustion. This indicated that emissions of trace metals were controlled by the combustion modes and combustion conditions.
出处
《环境科学学报》
CAS
CSCD
北大核心
2013年第5期1389-1395,共7页
Acta Scientiae Circumstantiae
基金
安徽省教育厅自然科学基金(No.KJ2011B151)
环境保护部公益性行业科研专项(No.2011467011)~~
关键词
高砷褐煤
重金属元素
分布特征
环境影响
high arsenic lignite
heavy metal element
distribution characteristic
environmental impact
