基于MVR热泵精馏的粗甘油脱水提纯工艺模拟研究

摘要

Based on Aspen Plus with the NRTL-RK equation, Radfrac. module and Compr. module, simulation of glycerol purification process was carried out. The differences between the conventional distillation process and two kinds of heat pump distillation processes were compared. The two kinds of heat pump distillation processes were the top steam direct compression and the tower bottom liquid phase flash compression. The results show that,for the glycerol purification process, under the same condition of processing capacity, product quality, operating pressure, reflux ratio and product purity (no less than 99%), the two MVR heat-pump distillation processes can save respectively energy by 56.5% and 54.5% than the conventional distillation process. The total energy consumption (standard oil / ton of product) of the two kinds of heat pump distillation processes can be saved as much as 58.75% and 56.67% respectively, reflecting significant energy saving effect.%利用Aspen Plus流程模拟软件，选用NRTL-RK物性模型和精馏模型格及压缩机模块对粗甘油脱水过程进行了模拟计算，分别计算了塔顶汽相出料直接压缩热泵精馏、塔底产物闪蒸压缩热泵精馏以及常规精馏，结果表明：对于粗甘油脱水提出过程来说，在相同的原料处理量、产品质量、操作压力及回流比、产品纯度（≥99%）时，两种热泵精馏工艺均比常规精馏工艺的能耗有所降低，分别节能56.5%和54.5%，总能耗（标油/吨产品）比常规精馏工艺分别节能58.75%和56.67%，具有十分显著的节能效果。