酸性气体脱除单元副产二氧化碳中夹带甲醇的去除方案研究

Study on Plan of Removing Entrained Methanol from By-produced CO_(2) of Acid Gas Removal Unit

酸性气体脱除单元副产的二氧化碳可作为粉煤气化装置载气循环利用,但其夹带微量甲醇,需经过处理才能达标排放。以某二氧化碳需求量为20000 m^(3)/h的粉煤气化装置为例,分析对比了压缩机段间洗涤和压缩前洗涤两种水洗法脱除二氧化碳中微量甲醇的方案,结果发现水洗法脱除甲醇的方案可行,且压缩机段间洗涤方案较压缩前洗涤方案安全性更高,设备费用更低,能耗低15.5%,每小时可省操作费用105.1元。初步探讨了吸附法用于脱除二氧化碳中微量甲醇的可行性。

By-product CO_(2) from acid gas removal unit could be reused as the carrier gas in pulverized coal gasification unit,but trace amount of its entrained methanol had to be treated to meet the standard for discharge.Taking an example of pulverized coal gasification unit requiring 20000 m^(3)/h CO_(2),the analysis and comparison were made on two processes of methanol removal:compressor inter-stage scrubbing and pre-compression scrubbing.The results showed that scrubbing plan was feasible,and compared with pre-compression scrubbing,the compressor inter-stage scrubbing had higher safety and lower equipment cost.The energy consumption could be reduced by 15.5%and operating cost could be saved by RMB 105.1 per hour.In addition,a preliminary study was made on the feasibility of methanol removal in CO_(2) by adsorbent.