System for treating PSA tail gas after low-temperature methanol washing

The utility model relates to a system for treating PSA tail gas after low-temperature methanol washing. The device comprises a CO separation cold box, a CO compressor and a PSA H2 purification unit, the system further comprises a PSA tail gas compressor, the CO separation cold box is connected with the PSA H2 purification unit and the CO compressor through pipelines, the PSA H2 purification unit is connected with the PSA tail gas compressor and the fuel gas pipe network through pipelines, and the PSA tail gas compressor is connected with the CO separation cold box through a pipeline. By the adoption of the PSA tail gas treatment device, operators for PSA tail gas treatment are reduced, the whole technological process is more stable, replacement and burying of adsorbents are reduced, and good social and economic benefits are generated. 本实用新型涉及一种低温甲醇洗后PSA尾气处理系统，包括CO分离冷箱、CO压缩机和PSA提纯H单元，还包括PSA尾气压缩机，CO分离冷箱通过管道连接PSA提纯H单元和CO压缩机，PSA提纯H单元通过管道连接PSA尾气压缩机和燃料气管网，PSA尾气压缩机通过管道连接CO分离冷箱。采用本实用新型减少了PSA尾气处理时的操作人员，而且使全部工艺流程更加稳定，减