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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。
The total energy consumption of the ethylene rectification column is the sum of the energy consumption of the rectification column itself and the energy consumption of the ethane cycle cracking on the bottom of the column. The larger the recovery rate, the higher the energy consumption of the rectification column itself, Lower consumption. Therefore, the total system energy consumption and the recovery rate is no longer monotonous relationship between ordinary distillation column, but as the recovery rate increases, the first decrease and then increase, there is the optimal operating system of the total energy consumption. The recovery rate is affected by the upper and lower limits of the gas-liquid phase load and the fluctuations of the total energy consumption. There is a corresponding feasible operation field. After the feed is reduced, the gas-liquid phase load and total energy consumption fluctuations on the recovery area of the corresponding changes occur. In actual operation, no matter how the feed changes, only the recovery rate and the total system energy consumption are controlled in the corresponding feasible operation domain, the higher recovery rate and lower system energy consumption can be obtained under the premise of ensuring product quality , To achieve a balanced operation of recovery and total system energy consumption optimization.