基于MVR热泵精馏的混合醇热集成分离工艺

·4120·化工进展CHEMICALINDUSTRYANDENGINEERINGPROGRESS2015年第34卷第11期基于MVR热泵精馏的混合醇热集成分离工艺杨德明，谭建凯，王颖，蒋宇，高晓新(常州大学石油化工学院，江苏常州213164)摘要：机械蒸汽再压缩(MVR)热泵技术是把低品位的蒸汽通过压缩转变为高品位的蒸汽，循环用于热源的供热以减少能耗。而热集成技术则是合理的匹配冷热物流的换热，以提高物流的有效能利用率。鉴于精馏过程的高能耗和低热力学效率，本文以四元混合醇的分离为研究对象，把基于MVR热泵技术的热集成精馏工艺应用于该体系的分离，提出并研究了该体系带热集成与不带热集成各种MVR精馏工艺；以能耗和年总费用(TAC)为评价指标，采用AspenPlus软件对各分离工艺进行模拟与优化，确定各分离．Y-艺的操作参数与设备参数。研究结果表明，与常规顺序分离工艺相比，MVR精馏工艺节约能耗50％以上，节约年总费用约61％。带热集成MVR精馏工艺与不带热集成MVR精馏工艺相比，在能耗和年总费用方面，优势相当，但前者热力学效率提高了约9．5％。关键词：混合醇；机械蒸汽再压缩；热泵精馏；热集成；年总费用；能耗中图分类号：TQ028文献标志码：A文章编号：1000—6613(2015)1l一4120—06Dol：10．16085／j．issn．1000—6613．2015．11．048HeatintegratedseparationtechnologyforseparatingmixedalcoholbasedontheMVRheat-pumpdistillationYANGDeming，TANJiankai，WANGYing，JIANGYu，GAOXiaoxin(CollegeofPetrochemicalEngineering，ChangzhouUniversity，Changzhou213164，Jiangsu，China)Abstract：Thelowgradesteamistransformedintoahighgradesteamthroughthecompressionbymechanicalvaporrecompression(MVR)heatpumptechnology，andthehighgradesteamiscyclicutilizedforheatsourcetoreduceenergyconsumption．TheheatintegrationtechnologyisreasonabletomatchtheheatexchangeofcoldandhotlogisticstoimprovetheeffectiveenergyutilizationoflogisticsInviewofthehighenergyconsumptionandlowmechanicaleficiencyofthedistillationprocess，heatintegratedseparationtechnologybasedontheMVRheat—pumpdistillationwasappliedtoseparatethefourmixedalcoholsysteminthisresearch，andtheMVRheat—pumpdistillationprocesswithandwithoutheatintegrationwereproposed．Basedontheminimumtotalannualcost(TAC)andenergyconsumption，simulationsfortheeachkindofdistillationprocesswereperformedbyAspenPlussoftware，andtheoptimaloperatingparametersandplantparametersweredetermined．ThesimulationresultsshowedthattheMVRheat—pumpdistillationcansaveenergyby50％andtotalannualcostby61％respectivelycomparedwiththeconventionalorderseparationprocess．BothoftheMVRheat-pumpdistillationwithandwithoutheatintegrationhavethesameexcellentperformanceinenergysavingandannualtotalcostsaving。buttheformercanimprovethethermodynamiceficiencyby9．5％．