Gaseous sulfur is released during fluidized bed coal gasification, and control the yield of gaseous sulfur or the conversion between gaseous organic sulfur and inorganic sulfur at source is necessary, because it can economically satisfy the requirements of industrial production and protect the environments. In this study, sulfur release behaviors of a middle-sulfur coal called Guizhou coal were quantitatively determined through controlled experiments in a lab-scale fluidized bed during oxygen rich-steam gasification. The measured gaseous sulfur species were H₂S, SO₂, COS and CS₂. The effects of temperature (850^OC-950^OC) and limestone (Ca/S = 2) on the sulfur release behaviors were investigated. Among the above four gaseous sulfur, the yield of H₂S is the highest, followed by COS, while only less than 1.5% of sulfur in coal is released as SO₂ and CS₂. With the increase in temperature, the yield of H₂S increases while that of SO₂ decreases, and the change of COS yield and CS₂ yield is not obvious. The molar ratio of H₂S/COS increases with increasing temperature, which is qualitatively matched by thermodynamic analysis. The addition of limestone reduces the released sulfur but not change the distribution of gaseous sulfur forms. Meanwhile, the molar ratio of H₂S/COS increases after adding limestone, while the trend with temperature of H₂S/COS does not change. The removal rate of H₂S is between 23% and 28%, which increases with temperature. The distributions of sulfur in bottom char and fly ash are similar. The main sulfur species in the bottom char is organic sulfur, and thiophene dominates the organic sulfur. The increase of temperature and the addition of limestone will both promote the increase of inorganic sulfur content, and the decrease of organic sulfur content.

在流化床煤气化过程中会释放出气态硫，因此有必要控制气态硫的收率或从源头上控制气态有机硫与无机硫之间的转化，因为它可以经济地满足工业生产的要求并保护环境。在这项研究中，通过在富氧蒸汽气化过程中在实验室规模的流化床中进行的受控实验，定量确定了一种称为贵州煤的中硫煤的硫释放行为。测得的气态硫种类为H ₂ S，SO ₂，COS和CS ₂。温度的影响（850 ^O C-950 ^OC）和石灰石（Ca / S = 2）对硫的释放行为进行了研究。在以上四种气态硫中，H ₂ S的产率最高，其次是COS，而煤中只有不到1.5％的硫以SO ₂和CS _2的形式释放。随着温度的升高，H ₂ S的收率增加而SO ₂的收率下降，COS收率和CS ₂收率的变化不明显。H ₂ S / COS的摩尔比随温度升高而增加，通过热力学分析定性地匹配。石灰石的添加减少了释放的硫，但没有改变气态硫形式的分布。同时，H的摩尔比添加石灰石后₂ S / COS增加，而H ₂ S / COS随温度的变化趋势不变。H ₂ S的去除率在23％至28％之间，随着温度的升高而增加。底炭和粉煤灰中硫的分布相似。底部焦炭中的主要硫种类是有机硫，而噻吩在有机硫中占主导地位。温度的升高和石灰石的添加都将促进无机硫含量的增加和有机硫含量的降低。