IGCC联产甲醇装置的变换与燃气热回收工艺

Shifting and Recovery Process of Combustion Gas in Methanol Plant in Combinative Production of IGCC

根据IGCC联产甲醇装置的变换脱硫和燃气脱硫的工艺要求,分析了甲醇装置变换工序的全气量变换工艺和部分变换工艺的优缺点,确定了变换与燃气热回收工艺方案。其工艺流程和特点:以部分气量通过变换炉可控制较高的水汽比;部分气量通过中温有机硫水解槽将大部分COS转化为H2S,再分别送至NHD燃气脱硫工序和变换工序。应用结果表明,由于设置了中温有机硫水解槽,减少了带入后系统的COS含量,保证了变换气脱硫和燃气脱硫系统的稳定运行。

According to the process requirement for shift gas de-sulfur and Combustion gas de-sulfur in the IGCC combinative production of methanol plant, author has analyzed the advantage and the shortage for the total gas flow shift process and the partial gas flow shift process in the shift section of methanol plant, the process scheme was determined for the heat recovery of both shift gas and the combustion gas. Its process flow and feature are ： That taking partial gas flow passes the shift furnace can control the higher ratio of water/steam; another part of the gas flow passes the middle temperature organic sulfur hydrolysis tank can convert the most portion of COS into H2S, then separately sending them to the combustion gas de-sulfur section and shift gas de-sulfur section by NHD. Application result indicates that the COS content bringing into subsequent system is reduced due to arrangement of middle temperature organic sulfur hydrolysis tank, and therefore the stable operation is guaranteed for the systems of shift gas de-sulfur and combustion gas de-sulfur.