结合某200 kt丙烯腈生产项目设计氨水吸收式梯级制冷系统，用以回收丙烯腈项目排出的吸收塔尾气焚烧炉（AOGI）烟气余热。通过该系统既可制取-10℃的盐水，替代此项目原有螺杆乙二醇制冷机达到丙烯腈单元的生产要求；又可制取-5℃的冰，可以应用于餐饮行业保存食物等。应用MATLAB软件对设计系统进行仿真，并采用夹点技术进行分析计算。实验结果表明，系统共回收AOGI烟气量1.67×105 Nm3/h，可制取621 kW的冷量，共节约电量187.11 kW，一年可节省人民币约95万元。%A multiple ammonia-water absorption refrigeration system was designed to recover and utilize waste heat in flue gas from Absorber Off Gas Incinerator(AOGI) in a 200 kt acrylonitrile production unit. The designed system could get-10℃ inorganic salt water solution to replace the former screw glycol refrigerating machine in the unit. It could meet the production requirement for the acrylonitrile unit and the system could product-5℃ ice at the same time And the ice may be applied in food industry to preserve food,etc. The designed system was simulated by means of the MATLAB software and was calculated by pinch technology. It could be concluded that this system could recover the AOGI flue gas volume of 1.67×105 Nm3/h,gain the cooling capacity of 621 kW,save electric power of 187.11 kW and economize about￥950,000 per year.
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