环己酮装置铂催化苯加氢与环己醇脱氢热联合工艺研究

Study on the heat integration of platinum catalytic benzene hydrogenation and cyclohexanol dehydrogenation in cyclohexanone unit

以某10万t/a环己酮生产装置为例,采用分析法讨论了铂催化苯加氢与环己醇脱氢的能量利用情况。介绍了现有的能量利用方式,即加氢反应热进废热锅炉副产低压蒸汽,脱氢所需要的热量由导热油炉提供,并在此基础上研究了采用铂催化苯加氢与环己醇脱氢热联合新工艺的可行性。热联合工艺利用加氢反应热向脱氢反应供热,停用导热油炉。分析计算结果表明:采用热联合后装置的效率从43.2%提高至58.2%,每年节省的装置操作费用可达1 239万元;同时也减少或消除了由燃油、燃煤或燃气导热油炉排出的烟气所带来的环境污染问题。

Taking a 100 kt / a cyclohexanone unit as an example, the energy utilization status of platinum catalytic benzene hydro？genation and cyclohexanol dehydrogenation is discussed by exergy analysis method. The existing energy utilization process, that is dis？charging reaction heat generated by hydrogenation into waste heat boiler to produce low pressure steam and providing dehydrogenationheat by thermal oil furnace, is presented. On this basis, the feasibility of heat integration process of platinum catalytic benzene hydro？genation and cyclohexanol dehydrogenation is studied. In the heat integration process, the reaction heat generated by hydrogenation issupplied to dehydrogenation, and the thermal oil furnace can be out of service. The results of exergy analysis show that the exergy efficiency of the unit increases from 43.2% to 58.2% after applying heat integration process, and the operating cost can be saved about12.39 million yuan per year. Meanwhile, the environmental pollution brought by exhaust gas discharged from fuel oil, fire coal or fuelgas thermal oil furnace can be decreased or eliminated.