PDF《敞口地炉内燃烧煤泥饼时氟的逸出规律及控制》

敞口地炉内燃烧煤泥饼时氟的逸出规律及控制 陈成广

1 , 吴代赦

1 ,2

3 , 王五一

2 , 郑宝山

3 , 肖化云

1 , 李萍11.

南昌大学 环境科学与工程学院 ,教育部鄱阳湖湖泊生态与生物资源利用实验室 ,江西 南昌

330031 2. 中国科学院 地理科学与资源研究所 ,北京

100101 3. 中国科学院 地球化学研究所 ,贵州 贵阳

550002 摘要 : 利用特制精确控温敞口炉 ,模拟重病区居民燃烧煤泥饼时氟的排放及控制 ,分析了停留时间、 燃烧温度对氟排放的影 响 ,探讨了 CaCO3 添加量及燃烧温度与固氟率的关系. 结果表明 :随着煤泥饼在炉内停留时间的延长 ,氟的逸出率逐渐增大 ,1 h 后氟的排放达到平衡 ;

氟逸出率随温度升高而增加 ,900 ℃ 时逸出率平均为

80 % ,与病区实际燃烧排氟量相吻合 ;

煤泥饼中 添加 CaCO3 能有效控制燃烧氟排放 ,固氟率随 CaCO3 添加量的增加而增大 , w (CaCO3 ) 为10 %时达到最佳固氟效果 ;

500~

800 ℃ 内固氟率随温度升高而增加 ,800 ℃ 时固氟率最高 ,平均为

4412 % ,温度继续升高则固氟率下降 ,900 ℃ 时为

2510 %. 关键词 : 煤泥饼 ;

CaCO3 ;

固氟 ;

氟释放 中图分类号 : X506 文献标识码 : A 文章编号 :

1001 - 6929(2008)

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0133 -

06 Regularity and Control of Fluorine Release from Coal2Clay Briquette Combustion in Open Ground2Stove CHEN Cheng2guang

1 , WU Dai2she

1 ,2 , WANG Wu2yi

2 , ZHENGBao2shan

3 , XIAO Hua2yun

1 , LI Ping

1 1. Key Lab of Poyang Lake Ecology and Bio2resource Utilization , Ministry of Education ;

College of Environmental Science and Engineering , Nanchang University , Nanchang

330031 , China 2. Institute of Geographical Sciences and Natural Resources Research , Chinese Academy of Sciences , Beijing

100101 , China 3. Institute of Geochemistry , Chinese Academy of Sciences , Guiyang

550002 , China Abstract: A precise temperature regulating open furnace was devised to describe and analyze the regularity and control of fluoride emission from coal2clay briquette combustion in open ground 2stove in the serious coal2clay combustion type fluorosis areas , the effect of retention period and combustion temperature on fluorine emission and the relationship of fluorine retention with the dosage of CaCO

3 and combustion temperature were obtained. Experimental results indicate that fluorine emission tends to increase with increasing retention period or combustion temperature , and the fluorine emission rate keeps stabile after

1 h. The average fluorine emission rate reaches

80 % at900 ℃, this is similar to the fluorine emission rate under usual combustion condition. Selecting CaCO3 as calcium2based sorbent can decrease fluoride release from coal2clay briquette combustion effectively , fluorine retention tends to increase with increasing the dosage of CaCO

3 , and the optimum condition for fluorine retention is blending

10 % CaCO3 with coal2clay briquette. Fluorine retention rate tends to increase with increasing combustion temperature from

500 ℃to

800 ℃, it reaches the highest rate at

800 ℃, and the average fluorine retention rate is

4412 %. But above

800 ℃, fluorine retention rate declines versus combustion temperature , at

900 ℃, it reaches

2510 %. Key words: coal2clay briquette ;

CaCO3 ;

fluorine retention ;

fluorine emission 收稿日期 :

2007 -

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08 修订日期 :

2007 -

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