摘要
考察了焦煤中少量氧化铅添加剂对炼焦过程高温焦炉煤气硫化氢浓度以及对焦炭质量的影响。实验表明,煤中添加少量的氧化铅,可以达到焦炉粗煤气脱硫的目的,并且对焦炭的质量影响很小。针对实验所用的煤种,相当于焦煤质量的0 6%的氧化铅添加量在炼焦前期具有最佳的抑制硫释放的效果。炼焦后期,半焦中的硫化铅分解或铅转变为气态铅。气态铅和硫化氢在离开炼焦室时,由于煤气降低温度,又生成硫化铅。从而实现均相脱硫。焦炭中超过一半的铅可以挥发出去。在炼焦收缩阶段,半焦中过多的铅的存在不利于硫化铅的分解。
Lead oxide was used as additive in coking coal to investigate homogeneous desulfurization behavior during coking process Result shows that in plastic stage, lead oxide additive was sulfided and the release of sulfur in coal was suppressed The amount of sulfur absorbed by lead oxide increased with the increase of added amount of lead oxide, however, this tendency almost disappeared when the additive amount reaches 06% of coal In contract stage, lead sulfide decomposed under hydrogenrich atmosphere and some elemental lead vaporized Homogenous reaction between hydrogen sulfide and elemental lead vapor removes hydrogen sulfide efficiently as the hot coal gas left the carbonizer Elemental analysis on the coke product shows that more than 50% of lead in coke could be removed It's suggested that lead oxide additive could remove hydrogen sulfide homogeneously during coking process and is little deleterious on coke quality
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
2003年第5期485-489,共5页
Journal of Fuel Chemistry and Technology
基金
国家自然科学基金(50004006)~~
关键词
氧化铅
炼焦
焦炉煤气
脱硫
lead oxide
coke-making
coke oven gas
desulfurization
