热泵技术在异丙醇脱重塔中的应用

Application of Heat Pump Technology in Isopropanol De-heavy Fractionator

根据异丙醇生产工艺中异丙醇脱重过程的特点,设计了直接蒸汽压缩式热泵改进的脱重工艺。采用Aspen Plus软件对常规及热泵改进的异丙醇脱重工艺分别进行了严格模拟,并从年度总费用的角度对热泵改进工艺进行了评价。研究结果表明,热泵改进工艺较原工艺可节省年度费用397.57万元,其中能耗费用减少619.46万元/a,设备费用增加221.89万元/a,能耗费用降幅达72.2%,节能效果较为显著。热泵改进工艺中未使用低压蒸汽,循环冷却水的使用量大幅降低,但需新增压缩机电能的使用。热泵改进工艺中设备费用增加主要来自新增的热泵核心设备压缩机。

A isopropanol de-heavy process retrofitted by direct vapor compression-type heat pump was designed based on the characteristics of the isopropanol de-heavy process in isopropanol production technology.The original and heat pump-retrofitted isopropanol de-heavy processes were rigorously simulated by using the Aspen Plus software,and the evaluation of the heat pump-retrofitted isopropanol de-heavy processes was conducted according to the total annual cost(TAC).The results reveal that the heat pump-retrofitted process can reduce the TAC by 392.58×104 CNY/a compared with the original process.Furthermore,the energy-consumption cost decreases by 619.70×104 CNY/a,while the equipment investment cost increases by 221.74×104 CNY/a.There is a 72.2%decrease for the energy-consumption cost and the effect of energy-saving is greatly remarkable.The heat pump-retrofitted process consumes no low-pressure steam,reduces the requirement of circulating cooling water sharply,and adds the electricity consumption from the compressor.The increasement of the equipment investment cost in the heat pump-retrofitted process is mainly caused by the added compressor,which is the core equipment of the heat pump system.