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Sulfur transfers from pyrolysis and gasification of direct liquefaction residue of Shenhua coal

机译：神华煤直接液化残渣热解和气化过程中的硫转移

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The sulfur transformation during pyrolysis and gasification of Shenhua direct liquefaction residue was studied and the release of H_2S and COS during the process was examined. For comparison, the sulfur transfer of Shenhua coal during pyrolysis and that of pyrolyzed char during gasification were also studied. The residue was pyrolyzed at 10 ℃ /min to 950 ℃. During pyrolysis about 33.6% of sulfur was removed from the residue, among which 32.1% was formed H_2S in gas and 1.5% was transferred into tar, 66.4% of the sulfur was remained in residue char. Compared with coal, the residue has generated more H_2S due to presence of Fe_(1-x)S which was enriched in residue during liquefaction process. There is a few COS produced at 400-500 ℃ during pyrolysis of coal, but it was not detected form pyrolysis of the residue. During CO_2 gasification, compared with pyrolysis and steam gasification, there are more COS and less H_2S formation, because CO could react with sulfide to form COS. During steam gasification only H_2S was produced and no COS detected, because H_2 has stronger reducibility to form H_2S than CO. After steam gasification no sulfur was detected in the gasification residue. The XRD patterns show after steam gasification, only Fe_3O_4 is remained in the gasification residue. This indicates that the catalyst added during the liquefaction of coal completely reacted with steam, resulting in the formation of H_2 and Fe_3O_4.
机译：研究了神华直接液化残渣在热解和气化过程中的硫转化，并考察了过程中H_2S和COS的释放。为了进行比较，还研究了神华煤在热解过程中的硫转移和气化过程中热解焦的硫转移。将残余物以10℃/ min的速度热解到950℃。在热解过程中，从残留物中除去了约33.6％的硫，其中32.1％的气体中形成了H_2S，有1.5％的硫转移到了焦油中，有66.4％的硫残留在残渣中。与煤相比，由于Fe_（1-x）S的存在，在液化过程中富集了残渣，残渣产生了更多的H_2S。煤热解过程中，在400-500℃时产生了少量的COS，但未从残渣的热解中检测到。在CO_2气化过程中，与热解和蒸汽气化相比，有更多的COS和更少的H_2S形成，因为CO可以与硫化物反应形成COS；在蒸汽气化过程中，只有H_2S产生，而没有检测到COS，因为H_2具有更强的还原性以形成H_2S蒸汽气化后，气化残渣中未检测到硫。 X射线衍射图表明，在蒸汽气化后，仅Fe_3O_4残留在气化残渣中。这表明在煤液化过程中添加的催化剂与蒸汽完全反应，导致形成H_2和Fe_3O_4。

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