流化床煤燃烧过程中砷析出特性研究

通过流化床燃烧实验，研究了煤燃烧过程中砷的析出特性，并根据煤的浮-沉试验探讨了煤中砷的赋存形态.结果表明：砷析出率随燃烧温度的升高而增加，在600~700 ℃时，燃烧温度对砷析出率的影响较小， 700~900 ℃是砷析出的主要温度范围且燃烧温度对砷析出率的影响显著；砷析出率随燃烧时间的增加而增大，但前10 min是砷析出的主要阶段；砷在煤中主要以有机态和无机态两种形式存在，无机砷主要赋存在黏土矿物和硫铁矿中，砷析出率随煤中有机砷比例的增加而增大.

Arsenic emission characteristics during fluidized-bed coal combustion

Arsenic emission characteristics during coal combustion were studied by means of fluidized bed tube furnaces. And the modes of arsenic occurrence in coal were discussed by float and sink test of coal. The results indicated that arsenic emission tends to increase with increasing combustion temperature，the effect of combustion temperature on arsenic emission is weak at 600~700 ℃，700~900 ℃ is the main arsenic emission temperature range and at which the effect of combustion temperature on arsenic emission is obvious. Arsenic emission increases with increasing combustion time，the initial 10 min is the main arsenic emission period. Arsenic in coal exists by means of organic and inorganic association and the arsenic emission percent increases with increase of the ratio of organic arsenic to inorganic arsenic in coal during coal combustion.