A thermodynamic study of the removal of HCI and H2S from syngas  

作　　者：Joseph LEE Bo FENG 

机构地区：[1]School of Mechanical and lvlining Engineering, the University of Queensland, St Lucia Qld4072, Australia

出　　处：《Frontiers of Chemical Science and Engineering》2012年第1期67-83,共17页化学科学与工程前沿（英文版）

摘　　要：Advanced integrated-gasification combined- cycle （IGCC） and integrated-gasification fuel cell （IFGC） systems require high-temperature sorbents that are capable of removing hydrogen chloride and hydrogen sulfide from coal derived gases to very low levels. HCI and H2S are highly reactive, corrosive, and toxic gases that must be removed to meet stringent environmental regulations, to protect power generation equipment and to control the emissions of contaminants. The thermodynamic behavior of 13 sorbents for the removal of HCI and H2S under various conditions including： initial toxic gas concentra- tion （1-10000 ppm）, operating pressure （0.1-11 Mpa）, temperature （300 K-1500 K）, and the presence of H2O were investigated. The correlation between HC1 and H2S was also examined. Thermodynamic calculations were carried out for the reactions of the 113 sorbents using a FaetSage 5.2 software package based on free energy minimization. The sorbents, Na2CO3, NaHCO3, K2CO3, and CaO are capable of completely removing chlorine at high temperatures （up to -1240 K） and at high pressures. Water vapor did not have any significant effects on the dechlorination capability of the sorbents. Nine of the sorbents namely; Cu20, Na2CO3, NaHCO3, K2CO3, CaO, ZnO, MnO, FeO, and PbO, were determined to have great potential as desulfurization sorbents. Cu2Oand ZnO had the best performance in terms of the optimum operating temperature. The addition of water vapor to the reactant gas produces a slightly detrimental effi^ct on most of the sorbents, but FeO exhibited the worst performance with a reduction in the maximum operating temperature of about 428K. The dechlorination performance of the alkali sorbents was not affected by the presence of H2S in the reactions. However, the desulfurization capability of some sorbents was greatly affected by the presence of HC1. Particularly, the performance of Cu2O was significantly reduced when HC1 was present, but the performance ofFeO improved remarkably. gathered are valuable for soAdvanced integrated-gasification combined- cycle （IGCC） and integrated-gasification fuel cell （IFGC） systems require high-temperature sorbents that are capable of removing hydrogen chloride and hydrogen sulfide from coal derived gases to very low levels. HCI and H2S are highly reactive, corrosive, and toxic gases that must be removed to meet stringent environmental regulations, to protect power generation equipment and to control the emissions of contaminants. The thermodynamic behavior of 13 sorbents for the removal of HCI and H2S under various conditions including： initial toxic gas concentra- tion （1-10000 ppm）, operating pressure （0.1-11 Mpa）, temperature （300 K-1500 K）, and the presence of H2O were investigated. The correlation between HC1 and H2S was also examined. Thermodynamic calculations were carried out for the reactions of the 113 sorbents using a FaetSage 5.2 software package based on free energy minimization. The sorbents, Na2CO3, NaHCO3, K2CO3, and CaO are capable of completely removing chlorine at high temperatures （up to -1240 K） and at high pressures. Water vapor did not have any significant effects on the dechlorination capability of the sorbents. Nine of the sorbents namely; Cu20, Na2CO3, NaHCO3, K2CO3, CaO, ZnO, MnO, FeO, and PbO, were determined to have great potential as desulfurization sorbents. Cu2Oand ZnO had the best performance in terms of the optimum operating temperature. The addition of water vapor to the reactant gas produces a slightly detrimental effi^ct on most of the sorbents, but FeO exhibited the worst performance with a reduction in the maximum operating temperature of about 428K. The dechlorination performance of the alkali sorbents was not affected by the presence of H2S in the reactions. However, the desulfurization capability of some sorbents was greatly affected by the presence of HC1. Particularly, the performance of Cu2O was significantly reduced when HC1 was present, but the performance ofFeO improved remarkably. gathered are valuable for so

关 键 词：syngas cleaning SORBENT desulfurization dechlorination 

分 类 号：TQ175.713[化学工程—硅酸盐工业] TE644[石油与天然气工程—油气加工工程]