Research Onsurfur Release And Distibution During Oil Shale Retort

Improving the oil yield and controling the pollution problem, especially thepollution caused by sulfide,are the keys of the current optimization of Oil Shaleretort.The release process of H₂S is investigated during the samples of Huadian oilshale and Wangqing oil shale carbonization by a fixed-bed experiment. The studyinclude vapour concentration and operating gas velocity. Furthermore, we analyzedthe components of sulfur in semi-cokes,and emperimental datas was used to studytranslatecharacteristic of sulfide transfered from soild phase to gas and liquid phase.The programmed temperature rise method is used to study the releasecharacteristics of H₂S during Oil Shale retort. The results show as the followingpoints.The H₂S cumulative release of both samples is increasedwhile the vapourconcentration of mixed atmosphere increasing.Both samples have two main releasephase, and the second release peak becomes more obvious while the vapourconcentration increasing. Increasing operating gas velocity is favorable to masstransfer.GRAis used to contraste the vapour concentration and operating gas velocity.The distribution characteristics of sulfur in solid waste was investigated byanalyzed the components of sulfur of the semi-cokes which are taken out of thereactor at some specific temperature periods during the retorting of oil shale. Theresults show as the following points.the organic sulfur and the sulfur in pyrite ofHuadian Oil Shale start to react at about350℃,while those two in Wangqing havefew involved in reactionuntil temperature rises to500℃around. The sulfate sulfur ishardly decomposition in the mixed atmosphere of vapour and nitrogen during thewhole retort process because of lower temperature.By analyzing process of sulfur transfered from soild phase to gas and liquidphase,we have found that more sulfur transfer to gas phase than that transfer to liquidphase in both two samples,and the sulides in gas are more than that in solid phase offinal products for Huadian Oil Shale.Sulfur translating to liquid phase in500℃is at its maximum value.