基于机械蒸汽再压缩和有机朗肯循环技术的双溶剂协同萃取精馏分离乙酸甲酯-甲醇-水节能工艺
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摘要
针对双溶剂协同萃取精馏分离乙酸甲酯-甲醇-水三塔分离工艺特性及高能耗特点,把机械蒸汽再压缩(MVR)和有机朗肯循环(ORC)余热发电技术应用于该三塔的优化,提出了带中间再沸器的MVR热泵和ORC耦合MVR热泵两种节能精馏工艺。以年总费用(TAC)为精馏工艺评价指标,净输出功为ORC系统评价指标,采用Aspen Plus软件对提出的节能工艺进行模拟与优化。研究结果表明,就乙酸甲酯回收塔和甲醇回收塔而言,带中间再沸器的MVR热泵精馏工艺较常规双溶剂协同萃取精馏工艺能耗分别减少了57.38%和9.66%;TAC分别节省了31.34%和11.69%。而对于溶剂回收塔,带中间预分塔的ORC耦合MVR热泵精馏工艺较常规双溶剂协同萃取精馏工艺能耗减少了50.16%,TAC节省了36.13%。就整个萃取精馏系统而言,优化后的精馏工艺比原有双溶剂协同萃取精馏工艺能耗减少了45.48%,TAC节省了31.33%。
In the light of the high energy consumption characteristics of double solvent synergistic extractive distillation three tower process for methyl acetate-methanol-water,the mechanical vapor recompression(MVR)heat pump and organic Rankine cycle( ORC) waste power generation technologies were applied to optimization of the three towers,and the MVR heat pump distillation process with inter-mediate reboiler and MVR heat pump distillation process coupled with ORC were put forward. The results showed that in terms of methyl acetate recovery tower and methanol recovery tower,the MVR heat pump distillation process with inter-mediate reboiler can save energy by 57.38% and 9.66% ,decrease TAC(total annual cost)by 31.34% and 11.69% compared with the conventional double solvent synergistic extractive distillation process. For solvent recovery tower,the MVR heat pump distillation process by pre column coupled with ORC can save energy by 50.16% and decrease TAC by 36.13% compared with the conventional double solvent synergistic extractive distillation process. In terms of the whole extractive distillation system,optimized distillation process can save energy by 45.48% and decrease TAC by 31.33% compared with the conventional double solvent synergistic extractive distillation process.
In the light of the high energy consumption characteristics of double solvent synergistic extractive distillation three tower process for methyl acetate-methanol-water,the mechanical vapor recompression(MVR)heat pump and organic Rankine cycle( ORC) waste power generation technologies were applied to optimization of the three towers,and the MVR heat pump distillation process with inter-mediate reboiler and MVR heat pump distillation process coupled with ORC were put forward. The results showed that in terms of methyl acetate recovery tower and methanol recovery tower,the MVR heat pump distillation process with inter-mediate reboiler can save energy by 57.38% and 9.66% ,decrease TAC(total annual cost)by 31.34% and 11.69% compared with the conventional double solvent synergistic extractive distillation process. For solvent recovery tower,the MVR heat pump distillation process by pre column coupled with ORC can save energy by 50.16% and decrease TAC by 36.13% compared with the conventional double solvent synergistic extractive distillation process. In terms of the whole extractive distillation system,optimized distillation process can save energy by 45.48% and decrease TAC by 31.33% compared with the conventional double solvent synergistic extractive distillation process.
引文
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[2]ALCáNTARA-AVILA J R,SILLAS-DELGADOB H A,SEGOVIA-HERNáNDEZ J G,et al.Optimization of a reactive distillation process with intermediate condensers for silane production[J].Computers and Chemical Engineering,2015,78:85-93.
[3]顾承真,闵兆升,洪厚胜.机械蒸汽再压缩蒸发系统的性能分析[J].化工进展,2014,33(1):30-35.GU C Z,MIN Z S,HONG H S.Performance analysis of mechanical vapor recompression evaporation system[J].Chemical Industry and Engineering Progress,2014,33(1):30-35.
[4]GAO X X,MA Z F,MA J Q,et al.Application of three-vapor recompression heat-pump concepts to a dimethylformamide-water distillation column for energy savings[J].Energy Technology,2014,2(3):250-256.
[5]ABID U,MUSTAFA A,MEHMETE A.Thermal and exergetic approach to wet type rotary kiln process and evaluation of waste heat powered ORC(organic Rankine cycle)[J].Applied Thermal Engineering,2017,112:281-295.
[6]STEVEN L,HENK H,MARTIJNVANDEN B,et al.Review of organic Rankine cycle(ORC)architectures for waste heat recovery[J].Renewable and Sustainable Energy Reviews,2015,47:448-461.
[7]CAI J L,CUI X B,ZHANG Y,et al.Vapor-liquid equilibrium and liquid-liquid equilibrium of methyl acetate+methanol+1-ethyl-3-methylimidazolium acetate[J].Chem.Eng.Data.,2010,56(2):282-287.
[8]王慧,马新灵,孟祥睿,等.工质流量对ORC低温余热发电系统性能的影响[J].化工学报,2015,66(10):4185-4192.WANG H,MA X L,MENG X R,et al.Effect of mass flow rate on performance of organic Rankine cycle for power generation system with low-temperature waste heat[J].CIESC Journal,2015,66(10):4185-4192.
[9]CHEN Y,LUNDQVIST P,JOHANSSON A,et al.A comparative study of the carbon dioxide transcritical power cycle compared with an organic Rankine cycle with R123 as working fluid in waste heat recovery[J].Applied Thermal Engineering,2006,26(17):2142-2147.
[10]杨德明,谭建凯,王颖,等.基于MVR热泵精馏的混合醇热集成分离工艺[J].化工进展,2015,34(11):4120-4125.YANG D M,TAN J K,WANG Y,et al.Heat intergrated separation technology for separating mixed alcohol based on the MVR heat-pump distillation[J].Chemical Industry and Engineering Progress,2015,34(11):4120-4125.
[11]ZHU K,ZHANG M,WANG Y B,et al.Parametric optimization of low temperature ORC system[J].Energy Procedia,2015,75:1596-1602.
[12]SONG J,GU C W,LI X S.Performance estimation of Tesla turbine applied in small scale organic Rankine cycle(ORC)system[J].Applied Thermal Engineering,2017,110:318-326.
[13]DONG J Q,ZHANG X H,WANG J Z.Experimental investigation on heat transfer characteristics of plat heat exchanger applied in organic Rankine cycle(ORC)[J].Applied Thermal Engineering,2017,112:1137-1152.
[14]倪渊,赵良举,刘朝,等.非共沸混合工质ORC低温烟气余热利用分析与优化[J].化工学报,2013,64(11):3985-3992.NI Y,ZHAO L J,LIU Z,et al.Recovery of waste heat of low-temperature flue gas by parametric optimization on organic Rankine cycle with non-azeotropic mixture[J].CIESC Journal,2013,64(11):3985-3992.
[15]SUN W Q,YUE X Y,WANG Y H.Exergy efficiency analysis of ORC(organic Rankine cycle)and ORC based combined cycles driven by low-temperature waste heat[J].Energy Conversion and Management,2017,135:63-73.