带有侧线采出回流的部分透热精馏的节能优化
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摘要
以正丙醇-异丙醇体系为例,研究了带有侧线采出回流的部分透热精馏操作。在该操作中,精馏段侧线采出气相,经塔外冷凝后回流至塔内采出板上方;提馏段某塔板被同轴的夹套式中间再沸器环绕,侧线采出该板处的气相回流至塔内采出板上方。通过单因素分析和响应面法对精馏段和提馏段操作的相关工艺参数分别进行了模拟优化,并对相应操作的热力学性能和分离性能的变化进行了分析。最终优化结果表明:达到规定的分离效果,带有侧线采出回流的部分透热精馏相较于绝热精馏有效能损失降低了26.5%。带有侧线采出回流的部分透热精馏操作通过合理分配能量、降低对热剂和冷剂的品位要求和提高能量利用率,最终达到节能目的。
A partial diabatic distillation with side streams was studied by separating a binary mixture of n-propanol and isopropanol as an example. In the rectifying section, the vapor stream was withdrawn from the column and after condensation by the inter-condenser outside the column, it was then returned to the appropriate position above the output tray. In the stripping section, a jacketed inter-reboiler was set on the side of the section with the liquid inlet on the specific tray. The vapor stream in equilibrium was withdrawn from this tray and returned to its above appropriate position. The single-factor analysis and response surface method were used to simulate and optimize the relevant process parameters of the proposed operation in the rectifying section and the stripping section. The thermodynamic performance and separation performance of the scheme under the corresponding conditions were analyzed and showed that the exergy loss of the diabatic distillation with side streams was reduced by 26.5% as compared to that of adiabatic distillation when they had the same separation performance. The partial diabatic distillation with side streams achieves energy saving by rationally energy distribution, the energy quality reduction of heat and cold sources, and the improvement of energy-using efficiency.
A partial diabatic distillation with side streams was studied by separating a binary mixture of n-propanol and isopropanol as an example. In the rectifying section, the vapor stream was withdrawn from the column and after condensation by the inter-condenser outside the column, it was then returned to the appropriate position above the output tray. In the stripping section, a jacketed inter-reboiler was set on the side of the section with the liquid inlet on the specific tray. The vapor stream in equilibrium was withdrawn from this tray and returned to its above appropriate position. The single-factor analysis and response surface method were used to simulate and optimize the relevant process parameters of the proposed operation in the rectifying section and the stripping section. The thermodynamic performance and separation performance of the scheme under the corresponding conditions were analyzed and showed that the exergy loss of the diabatic distillation with side streams was reduced by 26.5% as compared to that of adiabatic distillation when they had the same separation performance. The partial diabatic distillation with side streams achieves energy saving by rationally energy distribution, the energy quality reduction of heat and cold sources, and the improvement of energy-using efficiency.
引文
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[27]Zhao S,Bai P,Tang K,et al.Optimal operation policy of multivessel batch distillationwith constant total refluxoperation for separation of a binary mixture[J].Asia-Pac.J.Chem.Eng.,2013,9(2):239-247.
[28]De Koeijer G,Rivero R.Entropy production and exergy loss in experimental distillation columns[J].Chem.Eng.Sci.,2003,58(8):1587-1597.
[29]肖武,李明月,阮雪华,等.响应面法优化一水硫酸氢钠流化催化精馏生产乙酸乙酯工艺条件[J].化工学报,2014,65(11):4465-4471.Xiao W,Li M Y,Ruan X H,et al.Optimization of ethyl acetate process conditions for sodium bisulfate fluidized catalytic distillation using response surface methodology[J].CIESC Journal,2014,65(11):4465-4471.
[30]赵朔,白鹏.带有内部热集成的多储罐间歇精馏全回流操作[J].化工学报,2015,66(11):4476-4484.Zhao S,Bai P.Internal heat integrated multivessel batch distillation with constant total reflux operation[J].CIESC Journal,2015,66(11):4476-4484.
[2]Feyzi V,Beheshti M.Exergy analysis and optimization of reactive distillation column in acetic acid production process[J].Chemical Engineering and Processing:Process Intensification,2017,120(10):161-172.
[3]林子昕,安维中,袁琳皓,等.基于?损失分析的反应精馏塔板上反应体积的优化设计[J].化工学报,2015,66(2):655-661.Lin Z X,An W Z,Yuan L H,et al.Design and optimization of reaction volume distribution in reactive distillation columns based on exergy loss analysis[J].CIESC Journal,2015,66(2):655-661.
[4]Nova-Rincón A,Ramos M A,Gómez J M.Simultaneous optimal design and operation of a diabatic extractive distillation column based on exergy analysis[J].Int.J.Exergy,2015,17(3):287-312.
[5]Sun J S,Dai L L,Shi M,et al.Further optimization of a parallel double-effect organosilicon distillation scheme through exergy analysis[J].Energy,2014,69(5):370-377.
[6]Fonyo Z.Thermodynamic analysis of rectification(1):Reversible model of rectification[J].Int.Chem.Eng.,1974,14(1):18-27.
[7]Jimenez E S,Salamon P,Rivero R.Optimization of a diabatic distillation column with sequential heat exchangers[J].Ind.Eng.Chem.Res.,2004,43(23):7566-7571.
[8]Spasojevi?M D,Djakovi?D D,Jankovi?M R.A new approach to entropy production minimization in diabatic distillation column with trays[J].Therm.Sci.,2010,14(2):317-328.
[9]Rivero R.Exergy simulation and optimization of adiabatic and diabatic binary distillation[J].Energy,2001,26(6):561-593.
[10]陆恩锡,李晓玲,吴震.蒸馏过程中间再沸器与中间冷凝器[J].化学工程,2008,36(11):74-78.Lu E X,Li X L,Wu Z.Inter-reboiler and inter-condenser in distillation[J].Chemical Engineering(China),2008,36(11):74-78.
[11]Schaller M,Hoffmann K H.Numerically optimized performance of diabatic distillation columns[J].Comput.Chem.Eng.,2001,25(11):1537-1548.
[12]Sauar E,Siragusa G,Andresen B.Equal thermodynamic distance and equipartition of forces principles applied to binary distillation[J].J.Phys.Chem.A,2001,105(11):2312-2320.
[13]Kjelstrup S,Bedeaux D,Sauar E.Minimum entropy production by equipartition of forces in irreversible thermodynamics[J].Ind.Eng.Chem.Res.,2000,39(11):4434-4436.
[14]Schaller M,Hoffmann K H,Rivero R,et al.The influence of heat transfer irreversibilities on the optimal performance of diabatic distillation columns[J].J.Non-Equil.Thermody.,2002,27(3):257-269.
[15]Shu L,Chen L,Sun F.Performance optimization of a diabatic distillation-column by allocating a sequential heat-exchanger inventory[J].Appl.Energ.,2007,84(9):893-903.
[16]Mah R S H,Nicholas J J,Wodnik R B.Distillation with secondary reflux and vaporization:a comparative evaluation[J].AIChEJournal,2010,23(23):651-658.
[17]Khoa T D,Shuhaimi M,Hashim H,et al.Optimal design of distillation column using three dimensional exergy analysis curves[J].Energy,2010,35(12):5309-5319.
[18]Rivero R,Garcia M,Urquiza J.Simulation,exergy analysis and application of diabatic distillation to a tertiary amyl methyl ether production unit of a crudeoil refinery[J].Energy,2004,29(3):467-489.
[19]Alcántara-Avila J R,Sotowa K I,Horikawa T.Entropy production and economic analysis in diabatic distillation columns with heat exchangers in series[J].Energy,2015,93(12):1719-1730.
[20]Agrawal R,Herron D M.Efficient use of an intermediate reboiler or condenser in a binary distillation[J].AIChE Journal,1998,44(6):1303-1315.
[21]Agrawal R,Herron D M.Intermediate reboiler and condenser arrangement for binary distillation columns[J].AIChE Journal,1998,44(6):1316-1324.
[22]An W Z,Yu F J,Dong F L,et al.Simulated annealing approach to the optimal synthesis of distillation column with intermediate heat exchangers[J].Chinese J.Chem.Eng.,2008,16(1):30-35.
[23]De Koeijer G M,Kjelstrup S,Van der Kooi H J,et al.Positioning heat exchangers in binary tray distillation using isoforce operation[J].Energ.Convers.Manage.,2002,43(9/10/11/12):1571-1581.
[24]Andersen T R,Siragusa G,Andresen B,et al.Energy efficient distillation by optimal distribution of heating and cooling requirements[J].Comput.Aided Chem.Eng.,2000,8(C):709-714.
[25]Bj?rn I N,Grén U,Soermardji A P.Diabatic distillationcomments on the influence of side streams[J].Comput.Aided Chem.Eng.,2005,20(C):511-516.
[26]Bj?rn I N,Grén U,Soermardji A P.Intermediate heat exchange for fixed separation requirements:applications to a binary sieve tray distillation column for energy savings[J].Chem.Eng.Res.Des.,2006,84(6):453-464.
[27]Zhao S,Bai P,Tang K,et al.Optimal operation policy of multivessel batch distillationwith constant total refluxoperation for separation of a binary mixture[J].Asia-Pac.J.Chem.Eng.,2013,9(2):239-247.
[28]De Koeijer G,Rivero R.Entropy production and exergy loss in experimental distillation columns[J].Chem.Eng.Sci.,2003,58(8):1587-1597.
[29]肖武,李明月,阮雪华,等.响应面法优化一水硫酸氢钠流化催化精馏生产乙酸乙酯工艺条件[J].化工学报,2014,65(11):4465-4471.Xiao W,Li M Y,Ruan X H,et al.Optimization of ethyl acetate process conditions for sodium bisulfate fluidized catalytic distillation using response surface methodology[J].CIESC Journal,2014,65(11):4465-4471.
[30]赵朔,白鹏.带有内部热集成的多储罐间歇精馏全回流操作[J].化工学报,2015,66(11):4476-4484.Zhao S,Bai P.Internal heat integrated multivessel batch distillation with constant total reflux operation[J].CIESC Journal,2015,66(11):4476-4484.