炉前煤低温干馏工艺中脱硫行为的模拟研究

为了提供燃煤炉前低温干馏系统中硫的脱除和转化的工业设计依据，采用自制的程序升温固定床反应器，在模拟燃煤炉前低温干馏的工况下考察了热解温度及Ca/S原子比对热解产物中硫分布的影响。结果表明，由于CaO的存在，循环流化床（CFB）锅炉的循环灰具有明显的固硫作用，在480℃~640℃、煤热解气、液产物中60％～70％的硫以CaS的形式固定在灰中。相同热解温度下，固硫作用随着Ca/S原子比的提高而增加，焦油收率和焦油中硫含量均有所下降。

Investigation on desulfurization behavior in low temperature coal pyrolysis process

The research on the influence of the ash from circulating fluidized bed(CFB) boiler on the desulfurization behavior of coal pyrolysis in the co-generation process which combines coal pyrolysis with CFB combustion was carried out in a fixed bed reactor.The circulating ash with CaO from CFBC shows a significant action of sulfur retention in coal pyrolysis process.Compared with the coal pyrolysis with inert solid heat carrier,about 60%~70% sulfur in gas and tar is retained in the ash.It is revealed that the behavior of sulfur retention increases with the atomic ratio of Ca/S.Only 0.6% and 4.8% of the total sulfur enter in the gas phase and liquid phase respectively at Ca/S atomic ratio of 3.6.At the same time,CaO can reduce the yield of tar and the total sulfur content in the tar.It is predicted that CaO can play a positive role in the reduction of sulfur emission in the combination process of coal pyrolysis and CFB combustion.