基于有机朗肯循环的混合二甲苯MVR热泵精馏工艺

发布时间：2018-01-29 10:46

本文关键词： 混合二甲苯 MVR热泵有机朗肯循环精馏计算机模拟能耗年总费用　出处：《化工学报》2017年12期 　论文类型：期刊论文

【摘要】：常规机械蒸气再压缩(MVR)热泵精馏分离混合二甲苯工艺,存在压缩机电耗较大及塔顶压缩蒸气的显热未被利用等问题。有机朗肯循环(ORC)发电技术则可以将低温余热转化为电能以供压缩机使用,由此提出了ORC发电技术耦合MVR热泵和带乏汽回热循环(EGC)的ORC发电技术耦合MVR热泵两种精馏工艺应用于本体系的分离研究。以年总费用(TAC)和能耗为分离工艺的评价指标,系统净输出功和循环热效率作为ORC系统的评价指标,对以上两种耦合精馏工艺进行模拟与优化,并与常规MVR热泵精馏工艺进行比较与分析。研究结果表明,ORC发电技术耦合MVR热泵精馏工艺和带EGC的ORC发电技术耦合MVR热泵精馏工艺较常规MVR热泵精馏工艺均具有一定的节能和经济优势,可分别减少能耗9.64%和9.89%,节省TAC 3.19%和3.50%。
[Abstract]:Conventional mechanical steam recompression MVR-based heat pump distillation separation mixed xylene process. There are some problems such as high power consumption of compressor and unutilization of sensible heat of compressed steam at the top of tower etc. Organic Rankine cycle ORC-based power generation technology can convert low temperature waste heat into electric energy for use in compressors. Therefore, the coupling of MVR heat pump with ORC power generation technology and EGCs with spent steam recuperation cycle are proposed. ORC power generation technology coupled with MVR heat pump two distillation processes were applied to the separation of the system. The total annual cost and energy consumption were taken as the evaluation index of the separation process. As the evaluation index of ORC system, the net output work and cycle heat efficiency of the system are simulated and optimized for the above two coupling distillation processes. And compared with the conventional MVR heat pump distillation process, the research results show that. ORC power generation technology coupling MVR heat pump distillation process and ORC power generation technology with EGC coupling MVR heat pump distillation process have certain energy-saving and economic advantages compared with conventional MVR heat pump distillation process. The energy consumption can be reduced by 9.64% and 9.89, respectively, and the TAC 3.19% and 3.50 can be saved respectively.
【作者单位】：常州大学石油化工学院;
【分类号】：TQ028.31;TQ241.13
【正文快照】： 引言对于邻二甲苯(OX)、间二甲苯(MX)、对二甲苯(PX)和乙苯(EB)混合物的分离,常规MVR热泵精馏工艺可以大幅度降低其分离能耗[1]。但混合二甲苯的常规MVR热泵精馏工艺中,由于塔的操作压力低于压缩蒸气的压力,为防止回流液入塔的闪蒸汽化现象,压缩蒸气经换热后得到的高温高压饱

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