内部热耦合精馏塔的传热及优化
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摘要
为研究同轴式内部热耦合精馏塔(HIDiC)在不同压缩比下的传热量和传热系数,以乙醇-水为分离物系,在自制中试装置中进行了实验研究。建立了同轴式HIDiC的传热模型即利用闪蒸罐代替塔板,计算进出闪蒸罐物流的焓值差,从而得到精馏段与提馏段板间换热量,并通过划分区域的方法计算了传热系数。以年度总费用(TAC)作为优化指标研究了实现外回流为零时所需的外部换热器的个数。结果表明:当压缩比为2.2时,塔间传热量最大,冷凝器和再沸器的负荷最低,且压缩比与传热系数的关系为负相关;随着精馏段与提馏段板间最小换热温差的增大,所需外部换热器个数不断减少,TAC呈现降低的趋势,当外部换热器个数为1,即热量耦合位置为精馏段第一块板与提馏段第一块板时,TAC最低。
In order to research the heat transfer rate and heat transfer coefficient of concentric internally heat-integrated distillation column(HIDiC)at different compression ratios,the experimental study was carried out in the self-made pilot plant with ethanol-water as the separation system.The heat transfer model of concentric HIDiC was built by replacing the plates with flash tanks.The heat transfer rate between the rectifying and stripping section was calculated by the enthalpy difference of the flow inlet and outlet of the flash tank,and the heat transfer coefficient was got by dividing region.The annual total cost(TAC)was used as an optimized index to study the number of external heat exchangers required to realize the zero external return.The results showed that when the compression ratio was 2.2,the heat transfer rate reached to the maximum,the duty of condenser and reboiler reached to the minimum,and the relationship between the compression ratio and heat transfer coefficient was negative.The number of external heat exchangers decreased and TAC began to drop with the increase of the minimum heat transfer temperature difference.TAC reached to the minimum by adding one heat exchanger between the first plate of rectifying and stripping section.
In order to research the heat transfer rate and heat transfer coefficient of concentric internally heat-integrated distillation column(HIDiC)at different compression ratios,the experimental study was carried out in the self-made pilot plant with ethanol-water as the separation system.The heat transfer model of concentric HIDiC was built by replacing the plates with flash tanks.The heat transfer rate between the rectifying and stripping section was calculated by the enthalpy difference of the flow inlet and outlet of the flash tank,and the heat transfer coefficient was got by dividing region.The annual total cost(TAC)was used as an optimized index to study the number of external heat exchangers required to realize the zero external return.The results showed that when the compression ratio was 2.2,the heat transfer rate reached to the maximum,the duty of condenser and reboiler reached to the minimum,and the relationship between the compression ratio and heat transfer coefficient was negative.The number of external heat exchangers decreased and TAC began to drop with the increase of the minimum heat transfer temperature difference.TAC reached to the minimum by adding one heat exchanger between the first plate of rectifying and stripping section.
引文
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[23]GADALLA M,JIMENEZ L,OLUJIC Z,et al.A thermo-hydraulic approach to conceptual design of an internally heat-integrated distillation column(i-HIDi C)[J].Computers&Chemical Engineering,2007,31(10):1346-1354.
[24]GADALLA M,OLUJIC Z,SUN L,et al.Pinch analysis-based approach to conceptual design of internally heat-integrated distillation columns[J].Chemical Engineering Research&Design,2005,83(8):987-993.
[2]JIAO Y,WANG S J,HUANG K J,et al.Design and analysis of internallyheat-integrated reactive distillation processes[J].Industrial&Engineering Chemistry Research,2012,51(10):4002-4016.
[3]MEILI A.Heat pumps for distillation columns[J].Chem.Eng.Progress,1990,86:60-65.
[4]AGRAWAL R.Multicomponent distillation columns with partitions and multiple reboilers and condensers[J].Industrial&Engineering Chemistry Research,2001,40(20).DOI:10.1021/ie.000315n.
[5]FRESHWATER D C.Thermal economy in distillation[J].Transactions of the Institution of Chemical Engineers,1951,29:149-160.
[6]TAKAMATSU T,LUEPRASITSAKUL V,NAKAIWA M.Modeling and design method for internal heat integrated packed distillation column[J].Journal of Chemical Engineering of Japan,1988,21(6):595-601.
[7]OLUJI?,SUN L,RIJKE A D,et al.Conceptual design of an internally heat integrated propylene-propane splitter[J].Energy,2006,31(15):3083-3096.
[8]SUPHANIT B.Optimal heat distribution in the internally heat-integrated distillation column(HIDi C)[J].Fuel&Energy Abstracts,2011,36(7):4171-4181.
[9]SUPHANIT B.Design of internally heat-integrated distillation column(HIDi C):uniform heat transfer area versus uniform heat distribution[J].Energy,2010,35(3):1505-1514.
[10]ZHANG X X,HUANG K J,CHEN H S,et al.Comparing three configurations of the externally heat-integrated double distillation columns(EHIDDi Cs)[J].Computers&Chemical Engineering,2011,35(10):2017-2033.
[11]CHEN H S,HUANG K J,WANG S F.A novel simplified configuration for an ideal heat-integrated distillation column(ideal HIDi C)[J].Separation&Purification Technology,2010,73(2):230-242.
[12]HUANG Y B,HUANG K J.Experimental studies of the externally heat-integrated double distillation Columns(EHIDDIC)[J].AsiaPacific Journal of Chemical Engineering,2011,6(3):327-337.
[13]WANG Y,HUANG K J,WANG S F.A simplified scheme of externally heat-Integrated double distillation columns(EHIDDi C)with three external heat exchangers[J].Industrial&Engineering Chemistry Research,2010,49(7):3349-3364.
[14]HUANG K J,SHAN L,ZHU Q X,et al.Adding rectifying/stripping section type heat integration to a pressure-swing distillation(PSD)process[J].Applied Thermal Engineering,2008,28(8):923-932.
[15]HUANG K J,LIU W,MA J P,et al.Externally heat-integrated double distillation column(EHIDDDIC):basic concept and general characteristics[J].Ind.Eng.Chem.Res.,2010(49):1333-1350.
[16]XU L H,CHEN D W,YAN B H,et al.Experimental investigation on heat exchange and separation performance of an annular structured internal heat-integrated distillation column[J].Chinese Journal of Chemical Engineering,2014,22(10):1087-1091.
[17]XU L H,CHEN D W,LUO Y,et al.Intermediate heat-integrated sequence of distillation columns and its energy-saving property[J].CIESC Journal,2013(64):2503-2510.
[18]CHEN D W,YUAN X G,XU L H,et al.Comparison between different configurations of internally and externally heat-integrated distillation by numerical simulation[J].Industrial&Engineering Chemistry Research,2013,52(16):5781-5790.
[19]XU L H,YUAN X G,CHEN D W,et al.Reversibility analysis for design optimization of an internally heat-integrated distillation column[J].Chemical Engineering&Technology,2013,36:1147-1156.
[20]RIJKE A D,TESSELAER W,GADALLA M A,et al.Heat and mass transfer characteristics of an annular sieve tray[C]//IChem E Symposium Series No.152,2006:181-189.
[21]NODA H,MUKAIDA T,KANEDA M,et al.Internal column-to-column heat transfer characteristics for energy-saving distillation system[C]//IChem E Symposium Series No.152,2006:737-744.
[22]方静,赵蕊,李春利,等.同轴式内部热耦合精馏塔的传热性能[J].化工进展,2016,35(8):2342-2349.FANG J,ZHAO R,LI C L,et al.Heat transfer property of concentric internally heat integrateddistillation column[J].Chemical Industry and Engineering Progress,2016,35(8):2342-2349.
[23]GADALLA M,JIMENEZ L,OLUJIC Z,et al.A thermo-hydraulic approach to conceptual design of an internally heat-integrated distillation column(i-HIDi C)[J].Computers&Chemical Engineering,2007,31(10):1346-1354.
[24]GADALLA M,OLUJIC Z,SUN L,et al.Pinch analysis-based approach to conceptual design of internally heat-integrated distillation columns[J].Chemical Engineering Research&Design,2005,83(8):987-993.