摘要
为了研究不同因素对砷挥发的影响,选取7种典型煤种作为研究对象,在600~1 300℃内进行燃烧实验,并对煤的砷挥发进行了动力学分析.结果表明:当灰分含量差别不大时,2min时高挥发分煤中砷的挥发比例大于0.6,而低挥发分煤中砷的挥发比例不到0.3;当挥发分含量相差不大时,煤中砷的挥发比例与煤中的灰分有一定负相关性;温度是影响砷挥发的重要因素,700~1 000℃是砷挥发的主要温度区间;当水蒸气体积分数达到10%时,其对砷的挥发比例和挥发速率影响较为明显,当水蒸气体积分数进一步增大,其对砷挥发的影响逐渐减弱;挥发分对砷挥发表观活化能的影响大于灰分.
To study the effect of different factors on arsenic volatilization, combustion experiments of seven typical coals were conducted in the temperature range of 600-1 300℃, while an analysis was carried out on the dynamic characteristics of arsenic during coal combustion. Results show that when the ash contents are not very different, the ratio of arsenic evaporation is greater than 0.6 for high volatile coal, and is less than 0.3 for low volatile coal at two minutes when the volatilecontents are similar, the ratio of arsenic evapo- ration is negatively correlated with the ash content in coal temperature greatly affects the arsenic evaporation, and the main evaporation temperature lies in the range of 700-1 000℃; when the volume fraction of water vapor gets up to 10%, it would obviously affect the volatilization ratio and speed of arsenic, however, when the volume fraction goes up continuously, the effect would be gradually weakened~ the impact of volatile is greater than ash on the activation energy of arsenic volatilization.
出处
《动力工程学报》
CAS
CSCD
北大核心
2017年第5期349-355,378,共8页
Journal of Chinese Society of Power Engineering
基金
国家重点研发计划"煤炭清洁高效利用和新型节能技术"资助项目(2016YFB0600701)
关键词
煤燃烧
砷
挥发
动力学
coal combustion
arsenic
volatilization
kinetics
