LiBr-[BMIM]Cl/H_2O新型三元工质对的密度、黏度、比热容及比焓
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摘要
在前期研究的基础上,对Li Br-[BMIM]Cl/H_2O三元工质对的其他重要热力学数据进行了系统地测定,包括密度、黏度、比热容和比焓.采用最小二乘法对测定的热力学数据进行回归,得到了物性方程;实验值与物性方程计算值的平均绝对相对偏差(average absolute relative deviation,AARD)分别为0. 03%、1. 10%、0. 29%和0. 01%.除了结晶温度和腐蚀性,黏度是影响工质对实际应用的另外一个重要因素,Li Br-[BMIM]Cl/H_2O三元工质对的运动黏度小于25 mm~2·s~(-1),满足实际应用要求,且很好地改善了离子液体的高黏度问题.
Absorption heat pump(AHP) system is an energy-saving technology that utilizes renewable energy or industrial waste heat for refrigeration and heating. Therefore,it has attracted much attention for use in residential and industrial buildings. The thermodynamic performance of the AHP system greatly depends on the thermodynamic properties of its working pairs. In commercial applications,Li Br/H_2O is usually used as a traditional working pair. However,its shortcomings of easy crystallization and severe corrosion have significant impacts on the practical application of high-temperature AHP systems. To overcome the shortcomings of Li Br/H_2O,various ionic liquids(ILs)/H_2O mixtures have been recently investigated as alternative working pairs. Though ILs/H_2O has a wider operating temperature range and less corrosiveness,ILs/H_2O working pairs generally have very high viscosity,which restricts its practical applications. To further solve the above shortcomings of LiBr/H_2O and ILs/H_2O,a new ternary working pairs LiBr-[BMIM]Cl/H_2O was proposed in the previous study. Compared to the traditional LiBr/H_2O binary working pair,the LiBr-[BMIM]Cl/H_2O ternary working pair has advantages in terms of crystallization temperature and corrosiveness. LiBr-[BMIM]Cl/H_2O shows a great potential in the practical application of an AHP and refrigeration systems,especially at a high temperature. Based on the previous study,in this work,several important thermodynamic properties,including densities,viscosities,specific heat capacities,and specific enthalpies were systematically measured and correlated using the least-squares method,and the average absolute relative deviation(AARD)between the measured data and the calculated data is 0. 03%,1. 10%,0. 29%,and 0. 01%,respectively. In addition to the crystallization temperature and corrosiveness,viscosity is another key thermodynamic property affecting the practical application of working pairs in AHP system. The viscosity of LiBr-[BMIM]Cl/H_2O is less than 25 mm~2·s~(-1),which is well compatible with the application requirement. Moreover,the addition of LiBr in [BMIM]Cl/H_2O is beneficial for improving the high viscosity of ionic liquids.
Absorption heat pump(AHP) system is an energy-saving technology that utilizes renewable energy or industrial waste heat for refrigeration and heating. Therefore,it has attracted much attention for use in residential and industrial buildings. The thermodynamic performance of the AHP system greatly depends on the thermodynamic properties of its working pairs. In commercial applications,Li Br/H_2O is usually used as a traditional working pair. However,its shortcomings of easy crystallization and severe corrosion have significant impacts on the practical application of high-temperature AHP systems. To overcome the shortcomings of Li Br/H_2O,various ionic liquids(ILs)/H_2O mixtures have been recently investigated as alternative working pairs. Though ILs/H_2O has a wider operating temperature range and less corrosiveness,ILs/H_2O working pairs generally have very high viscosity,which restricts its practical applications. To further solve the above shortcomings of LiBr/H_2O and ILs/H_2O,a new ternary working pairs LiBr-[BMIM]Cl/H_2O was proposed in the previous study. Compared to the traditional LiBr/H_2O binary working pair,the LiBr-[BMIM]Cl/H_2O ternary working pair has advantages in terms of crystallization temperature and corrosiveness. LiBr-[BMIM]Cl/H_2O shows a great potential in the practical application of an AHP and refrigeration systems,especially at a high temperature. Based on the previous study,in this work,several important thermodynamic properties,including densities,viscosities,specific heat capacities,and specific enthalpies were systematically measured and correlated using the least-squares method,and the average absolute relative deviation(AARD)between the measured data and the calculated data is 0. 03%,1. 10%,0. 29%,and 0. 01%,respectively. In addition to the crystallization temperature and corrosiveness,viscosity is another key thermodynamic property affecting the practical application of working pairs in AHP system. The viscosity of LiBr-[BMIM]Cl/H_2O is less than 25 mm~2·s~(-1),which is well compatible with the application requirement. Moreover,the addition of LiBr in [BMIM]Cl/H_2O is beneficial for improving the high viscosity of ionic liquids.
引文
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[16]Zhang X D,Hu D P.Performance simulation of the absorption chiller using water and ionic liquid 1-ethyl-3-methylimidazolium dimethylphosphate as the working pair.Appl Therm Eng,2011,31(16):3316
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[22]Wang L.Principle and Application of Small-sized Absorption Refrigerator.Beijing:China Architecture and Building Press,2011(王林.小型吸收式制冷机原理与应用.北京:中国建筑工业出版社,2011)
[23]Wagman D D,Evans W H,Parker V B,et al.The NBS tables of chemical thermodynamic properties:selected values for inorganic and C1and C2organic substances in SI units.J Phys Chem Ref Data,1982,11(2):1
[24]Chen D,Xie J H.Heat Pump Water Heater.Beijing:Chemical Industry Press,2009(陈东,谢继红.热泵热水装置.北京:化学工业出版社,2009)
[25]Luo C H,Chen K,Li Y Q,et al.Crystallization temperature,vapor pressure,density,viscosity,and specific heat capacity of the Li NO3/[BMIM]Cl/H2O ternary system.J Chem Eng Data,2017,62(10):3043
[26]Dean J A.Lange's Handbook of Chemistry.New York:Mc GRAW-Hill Inc,1999
[2]Rivera W,Best R,Cardoso M J,et al.A review of absorption heat transformers.Appl Therm Eng,2015,91:654
[3]Sun J,Fu L,Zhang S G.A review of working fluids of absorption cycles.Renew Sust Energy Rev,2012,16(4):1899
[4]Kim K S,Park S Y,Choi S,et al.Vapor pressure of the 1-butyl-3-methylimidazolium bromide+water,1-butyl-3-methylimidazolium tetrafluoroborate+water,and 1-(2-hydroxyethyl)-3-methlimidazolium tetrafluoroborate+water systems.J Chem Eng Data,2004,49(6):1550
[5]He Z B,Zhao Z C,Zhang X D,et al.Thermodynamic properties of new heat pump working pairs:1,3-dimethylimidazolium dimethylphosphate and water,ethanol and methanol.Fluid Phase Equilibr,2010,298(1):83
[6]Ren J,Zhao Z C,Zhang X D.Vapor pressures,excess enthalpies,and specific heat capacities of the binary working pairs containing the ionic liquid 1-ethyl-3-methylimidazolium dimethylphosphate.J Chem Thermodyn,2011,43(4):576
[7]Zuo G L,Zhao Z C,Yan S H,et al.Thermodynamic properties of a new working pair:1-ethl-3-methylimidazoulium ethylsulfate and water.Chem Eng J,2010,156(3):613
[8]Dong L,Zheng D X,Li J,et al.Suitability prediction and affinity regularity assessment of H2O+imidazolium ionic liquid working pairs of absorption cycle by excess property criteria and UNIFACmodel.Fluid Phase Equilibr,2013,348:1
[9]Wang J Z,Zheng D X,Fan L H,et al.Vapor pressure measurement for the water+1,3-dimethylimidazolium chloride system and 2,2,2-trifluoroethanol+1-ethyl-3-methylimidazolium tetrafluoroborate system.J Chem Eng Data,2010,55(6):2128
[10]Nie N,Zheng D X,Dong L,et al.Thermodynamic properties of the water+1-(2-hydroxylethyl)-3-methylimidazolium chloride system.J Chem Eng Data,2012,57(12):3598
[11]Dong L,Zheng DX,Sun G M,et al.Vapor-liquid equilibrium measurements of difluoromethane+[Emim]OTf,Difluoromethane+[Bmim]OTf,Difluoroethane+[Emim]OTf,and Difluoroethane+[Bmim]OTf systems.J Chem Eng Data,2011,56(9):3663
[12]Li J,Zheng D X,Fan L H,et al.Vapor pressure measurement of the ternary systems H2O+Li Br+[Dmim]Cl,H2O+Li Br+[Dmim]BF4,H2O+Li Cl+[Dmim]Cl,and H2O+Li Cl+[Dmim]BF4.J Chem Eng Data,2011,56(1):97
[13]Kim S,Patrl N,Kohl P A.Performance simulation of ionic liquid and hydrofluorocarbon working fluids for an absorption refrigeration system.Ind Eng Chem Res,2013,52(19):6329
[14]Kim Y J,Kim S,Joshi Y K,et al.Thermodynamic analysis of an absorption refrigeration system with ionic-liquid/refrigerant mixture as a working fluid.Energy,2012,44(1):1005
[15]Zhang X D,Hu D P.Performance analysis of the single-stage absorption heat transformer using a new working pair composed of ionic liquid and water.Appl Therm Eng,2012,37:129
[16]Zhang X D,Hu D P.Performance simulation of the absorption chiller using water and ionic liquid 1-ethyl-3-methylimidazolium dimethylphosphate as the working pair.Appl Therm Eng,2011,31(16):3316
[17]Zheng D X,Dong L,Hung W J,et al.A review of imidazolium ionic liquids research and development towards working pair of absorption cycle.Renew Sust Energy Rev,2014,37:47
[18]Luo C H,Zhang Y,Su Q Q.Saturated vapor pressure,crystallization temperature and corrosivity of Li Br-[BMIM]Cl/H2O working pair.CIESC J,2016,67(4):1110(罗春欢,张渊,苏庆泉.Li Br-[BMIM]Cl/H2O工质对的饱和蒸气压、结晶温度和腐蚀性.化工学报,2016,67(4):1110)
[19]Liu G Q,Ma L X,Liu J.Handbook of Chemical and Engineering Property Data:Inorganic Volume.Beijing:Chemical Industry Press,2002(刘光启,马连湘,刘杰.化学化工物性数据手册(无机卷).北京:化学工业出版社,2002)
[20]Lee R J,Di Guilio R M,Jeter S M,et al.Properties of lithium bromide-water solutions at high temperatures and concentrationsⅡ:density and viscosity.ASHRAE Trans,1990,96(1):709
[21]Iyoki S,Uemura T.Heat capacity of the water-lithium bromide system and the water-lithium bromide-zinc bromide-lithium chloride system at high temperatures.Int J Refrig,1989,12(6):323
[22]Wang L.Principle and Application of Small-sized Absorption Refrigerator.Beijing:China Architecture and Building Press,2011(王林.小型吸收式制冷机原理与应用.北京:中国建筑工业出版社,2011)
[23]Wagman D D,Evans W H,Parker V B,et al.The NBS tables of chemical thermodynamic properties:selected values for inorganic and C1and C2organic substances in SI units.J Phys Chem Ref Data,1982,11(2):1
[24]Chen D,Xie J H.Heat Pump Water Heater.Beijing:Chemical Industry Press,2009(陈东,谢继红.热泵热水装置.北京:化学工业出版社,2009)
[25]Luo C H,Chen K,Li Y Q,et al.Crystallization temperature,vapor pressure,density,viscosity,and specific heat capacity of the Li NO3/[BMIM]Cl/H2O ternary system.J Chem Eng Data,2017,62(10):3043
[26]Dean J A.Lange's Handbook of Chemistry.New York:Mc GRAW-Hill Inc,1999