本文选取两种贵州高汞煤，在200-800℃的温度范围内，采用程序升温反应系统加热，利用美国EPA推荐的Ontario-Hydro方法捕捉不同形态汞。研究了在N2气氛和微氧化性气氛下温和热解过程中汞的释放和形态分布规律。实验结果表明：温度是影响煤温和热解过程中汞释放的主要因素，煤中汞释放率随着温度的升高而明显升高，当热解温度为600℃时，汞释放率可达90％左右。在微氧化性气氛下，汞的释放率随着氧气体积分数的升高而增大。元素汞（Hg^0）是气态汞释放的主要形态，热解停留时间及热解气氛对气态汞的释放形态也存在影响较大。
Two coals from Guizhou province with high mercury content were selected to investigate the mercury releasing and distribution characteristics during mild thermal upgrading under nitrogen and weak oxidizing atmospheres. The experiments were performed by using temperature controlled heating system under temperature range from 200 to 800℃, different forms of mercury were captured by using Ontario-Hydro Method. The results indicated that temperature was the main issue affecting mercury releasing characteristics during thermal upgrading, the releasing ratio of mercury increased obviously with the increasing of temperature, the highest mercury removal ratio could reach to 90% when the temperature was 600℃. Mercury removal ratio also increased with the increasing of oxygen content in the carrier gas. The results also indicated that Hg^0 was the major from of mercury released after mild coal thermal upgrading, but could be affected by the residence time and atmospheres as well.
参考文献
| [1] | 王泉海 .煤燃烧过程中汞排放及其控制的实验及机理研究[D].华中科技大学,2006. |
| [2] | 单晓梅,朱书全,李中和,吕森林.煤中有害微量元素对环境的影响及控制[J].选煤技术,2003(03):3-6. |
| [3] | 王宝凤,王刚,李文,陈皓侃,李保庆.亚临界水条件下煤中汞的脱除[J].燃料化学学报,2004(05):513-516. |
| [4] | 黄文辉,杨宜春.中国煤中的汞[J].中国煤田地质,2002(z1):37-40. |
| [5] | Cheng Zhang;Gang Chen;Rajender Gupta;Zhenghe Xu .Emission Control Of Mercury And Sulfur By Mild Thermalupgrading Of Coal[J].Energy & Fuels,2009(1):766-773. |
| [6] | 郭少青,杨建丽,刘振宇.热解气氛对晋城煤中汞析出的影响[J].燃料化学学报,2008(04):397-400. |
| [7] | 李扬,张军营,何北惠,赵永椿,余琛,王宗华,郑楚光.煤热解气化过程中汞的形态转化和释放规律[J].工程热物理学报,2008(10):1775-1779. |
| [8] | T.K.Das .Evolution characteristics of gases during pyrolysis of maceral concentrates of Russian coking coals[J].Fuel,2001(4):489-500. |
| [9] | 张成,曹娜,邱建荣,陈刚.煤燃烧前温和热解汞和硫的释放特性研究[J].中国电机工程学报,2009(20):35-40. |
| [10] | 丘纪华.煤粉在热分解过程中比表面积和孔隙结构的变化[J].燃料化学学报,1994(03):316-320. |
| [11] | 王明敏,张建胜,张守玉,吴晋沪,岳光溪.热解条件对煤焦比表面积及孔隙分布的影响[J].煤炭学报,2008(01):76-79. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%