【摘要】 乙烯精馏塔系统总能耗是精馏塔自身能耗与塔底乙烷循环裂解所用能耗之和,回收率越大,精馏塔自身能耗越高,而塔底乙烷循环裂解能耗越低。因此系统总能耗与回收率之间不再是普通精馏塔的单调关系,而是随着回收率增大,先降低后升高,存在系统总能耗最优操作区域。回收率受气液相负荷上、下限及总能耗波动的影响存在相应的可行操作域。进料降低后,气液相负荷与总能耗波动对回收率的限制区域发生相应的变化。实际操作时,无论进料如何变化,只需将回收率与系统总能耗控制在相应的可行操作域内,即可在保证产品质量前提下,得到较高的回收率与较低的系统能耗,实现回收率与系统总能耗的均衡操作优化。更多还原

【Abstract】 The energy consumption of ethylene column is caused by column itself and bottom circulating ethane. With the increase of recovery rate, the energy consumption of column itself becomes greater when the product quality is fixed, which is opponent to the energy consumption of bottom circulate ethane. Therefore the relationship between total energy consumption of ethylene column and recovery rate is no longer monotonous ordinarily. It is shown through study that the total energy consumption is firstly increased and then decreased as recovery rate increased. There is a feasible operating region for recovery rate resulted from the upper and lower limit of gas-liquid phase load and the fluctuatione of energy. The feasible operation region is variable with feed. In order to ensure quality of products, recovery rate and total energy consumption should be controlled within the appropriate feasible operation region regardless of the feed’s change. And it can get higher recovery rate and lower energy consumption and achieve the balanced operation optimization between recovery rate and energy consumption simultaneously.更多还原