燃煤电站锅炉颗粒Hg形态及其释放动力学参数

殷立宝; 高正阳; 徐齐胜; 郑双清; 钟俊; 陈传敏

燃煤电站锅炉颗粒Hg形态及其释放动力学参数

1.
广东电网公司电力科学研究院, 广东广州 510000;
2.
华北电力大学能源动力与机械工程学院, 河北保定 071003

基金项目: 国家自然科学基金（51076045）

详细信息

通讯作者:
殷立宝，Tel：13825135631；E-mail：yinlibao@yahoo.com.cn。

中图分类号: X511
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出版历程
- 收稿日期: 2013-03-19
- 修回日期: 2013-06-03
- 刊出日期: 2013-12-30

Analysis of species and thermal stability of particulate-bound mercury in coal-fired boiler

1.
Electric Power Research Institute of Guangdong Power Grid Corporation, Guangzhuo 510000, China;
2.
School of Energy Power and Mechanical Engineering, North China Electric Power University, Baoding 071003, China

摘要

摘要: 采集了一台320 MW机组锅炉在三个过量空气系数下的飞灰样品，将采集的飞灰筛分为四个粒径，测定了各飞灰样品的含炭量；对各飞灰样品进行两种加热方式的热处理，利用LUMEX全自动测汞仪测定了处理前后各飞灰样品的汞含量。根据飞灰中汞随温度的释放规律确定了飞灰中汞的形态，对加热过程颗粒Hg释放动力学参数进行了计算。测试与分析结果表明，粒径小的灰颗粒中汞浓度较高；过量空气系数增加后，飞灰含碳量降低，但飞灰中汞随过量空气系数的变化随粒径的不同有所不同；飞灰中含汞化合物的主要形态为HgCl₂和HgS，过量空气系数增加，飞灰中HgCl₂比例减少，HgS比例增加，HgO与HgSO₄的比例基本不变。停留时间是影响颗粒Hg生成的关键因素。过量空气系数越大，灰颗粒Hg释放的活化能就越大，大颗粒飞灰Hg释放活化能相对较大。
- 飞灰 /
- 粒径 /
- 热处理 /
- 含碳量 /
- 汞形态
Abstract: The fly ashes from a 320 MW unit boiler with three excess air conditions were sieved to 4 sizes. The carbon contents of the ashes were measured, and the ashes were heated at two heating modes. The Hg contents of the ashes were analyzed using LUMEX Mercury Analyzer, and the Hg species in the ashes was determined according to the Hg release characteristics at different heating temperatures. The activation energies for Hg release were calculated. The results indicate that the Hg concentration in the ashes increases with the decreasing of ash size. Increasing the excess air leads to the decrease of carbon in ash, while the influence of excess air on the Hg content varies with ash size. Hg compounds in fly ash are mainly HgCl₂ and HgS. The rising excess air results in a decrease of HgCl₂ proportion and an increase of HgS proportion, while the proportion of HgO and HgSO₄ keeps almost constant. Residence time is a key factor to influence the formation of particulate Hg. The increasing of excess air and particle size leads to an increase of activation energy for Hg release.
- fly ash /
- particle size /
- heat-treatment /
- carbon content /
- mercury species

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