水煤浆气化生产合成氨装置变换炉及变换工艺分析

Analysis of Shift Reactors and Shift Processes of Ammonia Plant Based on Coal Water Slurry Gasification

介绍了水煤浆气化生产合成氨装置中两种变换炉型:绝热变换炉和移热变换炉,根据不同的变换炉型,形成了两段绝热、两段移热和绝热+移热3种合成氨变换工艺。采用Aspen Plus模拟软件,计算了3种工艺下每台变换炉出口气体温度和CO含量,采用操作线分析的方法进行了比较,同时考察了3种工艺下的系统压降、副产蒸汽、催化剂装填量、运行和维护等,并对不同规模的合成氨装置变换工艺的选择给出了建议。

2 types of shift reactors,adiabatic shift reactor and heat-removal reactor,were introduced for ammonia plant based on coal water slurry gasification. According to different combinations of these 2 types,3 shift processes were formed,which were two-stage adiabatic process,two-stage heat-removal process,and adiabatic heating-removal process. With the simulation of Aspen Plus,temperature and CO content of each shift reactor exit gas were calculated for these 3 shift processes and comparison was made based on the method of operating line analysis. Besides,shift section pressure drop,steam generated as a by-product,catalyst volume,operation and maintenance of the 3 different processes were investigated,and suggestions were given for the selection of shift process for the ammonia plant of different capacities.