摘要
实验室模拟实验和农户家中的现场测定表明 ,室内空气氟含量与民用煤的氟含量呈正相关趋势 (R =0 6 1 2 ,p <0 0 1 ) ;但在民用炉燃烧温度条件下的煤氟释放率却与煤氟含量无关 .在 2 0 0～ 1 2 0 0℃范围内 ,煤氟释放率随温度的变化曲线呈“S”型 ,即 30 0℃时开始逐渐上升 ,70 0℃前较低 ,最高不超过 31 % ,70 0℃至 1 0 0 0℃之间 ,则释放率迅速上升 ,随后较为缓慢 ,到1 1 0 0℃至 1 2 0 0℃时 ,释放率接近 1 0 0 % ,其整个释放曲线可用Logistic方程来拟合 .总体上 ,煤氟释放与煤氟的存在状态和煤中的矿物及化学组成有关 ,贵州烟煤、无烟煤氟的燃烧释放要比陕南石煤更快 ,前者的释放率在 1 1 0 0℃时就接近 1 0 0 % ,而后者则到 1 2 0 0℃时才释放完全 .民用炉的燃烧温度最高为 1 0 0 0℃左右 ,这时贵州烟煤、无烟煤样品的平均氟释放率为 86 9% ,而陕南石煤样品的平均氟释放率为 80 6 % .
Laboratory experiments and in situ measurements inside farmer's houses indicate that the fluorine concentration of indoor air was positively related with the fluorine content in the consumed coal ( R =0.612, P <0 01), but fluorine content in the coal had no effect on the release rate of coal fluorine under the usual combustion temperature of about 1000℃. The release rate of coal fluorine varied versus combustion temperature ranging from 200 to 1200℃, following a “S” curve pattern, increasing slowly under 300 to 700 ℃, but quickly under 700 to 1000 ℃, and then slowly again before finally reaching 100% under 1100 to 1200℃, this curve can be fit by Logistic equation. The release rate of coal fluorine usually depends upon the existence status of fluorine and the chemical and mineral components of the coal. The fluorine in soft coal or anthracite from Guizhou is released more quickly than in bone coal from Southern Shanxi, with the former almost completely released under 1100℃ but the later almost completely released under 1200℃. The combustion temperature of civil stoves is at most 1000℃, under which averagely 86.9% of the fluorine in coal from Guizhou and 80 6% of that in bone coal from Southern Shanxi is released.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2004年第5期43-46,共4页
Environmental Science
基金
国家"十五"科技攻关课题 ( 2 0 0 1BA70 4B0 3 )
关键词
氟
释放率
烟煤
温度
测定方法
fluorine
coal
coal fluorine release
temperature
