熔盐单罐释热过程换热器取热方式优选
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摘要
盘管释热换热器浸没式布置在熔盐单罐蓄热器内可实现低成本的蓄放热。盘管换热器取热方式会直接影响系统的释热性能。通过数值模拟研究了换热器取热方式对单罐蓄热系统释热性能规律的影响,同时分析了释热过程中熔盐侧流场变化。结果表明,换热器上进下出的取热方式能够提高盘管换热器的出口温度、单罐释热功率及释热效率,研究结果为熔盐单罐蓄放热系统设计提供了理论依据。
Low cost heat charge and discharge can be realized by immersion arrangement of a helically coiled heat exchanger in molten salt single storage tank. Heat removal modes of the helically coiled heat exchanger will directly affect the heat discharge process of the storage system. Simulations were performed for two heat removal modes which include upper-lower path and lower-upper path. For different heat removal modes in the heat discharge process,the law of heat discharge performance of the molten salt single storage tank is given, and the change of flow field of molten salt side is analyzed. The results show that upper-lower path for the helically coiled heat exchanger can improve the transient out temperature, transient heat transfer rate and heat discharge efficiency. The research results provide a theoretical basis for the design of the molten salt single tank heat storage and discharge system.
Low cost heat charge and discharge can be realized by immersion arrangement of a helically coiled heat exchanger in molten salt single storage tank. Heat removal modes of the helically coiled heat exchanger will directly affect the heat discharge process of the storage system. Simulations were performed for two heat removal modes which include upper-lower path and lower-upper path. For different heat removal modes in the heat discharge process,the law of heat discharge performance of the molten salt single storage tank is given, and the change of flow field of molten salt side is analyzed. The results show that upper-lower path for the helically coiled heat exchanger can improve the transient out temperature, transient heat transfer rate and heat discharge efficiency. The research results provide a theoretical basis for the design of the molten salt single tank heat storage and discharge system.
引文
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[30]Nicodemus J H,Jeffrey J,Haase J,et al.Effect of baffle and shroud designs on discharge of a thermal storage tank using an immersed heat exchanger[J].Solar Energy,2017,157(15):911-919.
[2]孙晓丽,鹿院卫,崔锡民,等.单罐熔融盐释热传热规律实验研究[J].太阳能学报,2018,39(1):8-13.Sun X L,Lu Y W,Cui X M,et al.Heat discharge research of molten salt in single energy storage tank[J].Acta Energiae Solaris Sinica,2018,39(1):8-13.
[3]吴玉庭,张晓明,马重芳,等.一种带有中间蒸发器的熔盐蓄热式电加热集中供暖系统:106369655A[P].2017-02-01.Wu Y T,Zhang X M,Ma C F,et al.A central heating system with intermediate evaporator using molten salt for thermal storage by electric heating:106369655A[P].2017-02-01.
[4]马重芳,吴玉庭,任楠,等.熔盐蓄热式电加热集中供暖系统:103836703A[P].2014-06-04.Ma C F,Wu Y T,Ren N,et al.Central heating system using molten salt for thermal storage by electric heating:103836703A[P].2014-06-04.
[5]鹿院卫,吴玉庭,杜文彬,等.一种单罐电能蓄能装置:203771692U[P].2014-08-13.Lu Y W,Wu Y T,Du W B,et al.A device of single electric energy storage tank:203771692U[P].2014-08-13.
[6]鹿院卫,吴玉庭,杜文彬,等.一种单罐电能蓄能装置及其使用方法:103836795A[P].2014-06-04.Lu Y W,Wu Y T,Du W B,et al.A device of single electric energy storage tank and its using method:103836795A[P].2014-06-04.
[7]鹿院卫,吴玉庭,孙晓丽,等.一种单罐蓄能装置及其使用方法:103940119A[P].2014-07-23.Lu Y W,Wu Y T,Sun X L,et al.A device of single thermal energy storage tank and its using method:103940119A[P].2014-07-23.
[8]Brosseau D,Kelton J W,Ray D,et al.Testing of thermocline filler materials and molten-salt heat transfer fluids for thermal energy storage systems in parabolic trough power plants[J].Journal of Solar Energy Engineering,2005,127(2):109-116.
[9]Bradshaw R W,Dawson D B,Wolredo D L R,et al.Final test and evaluation results from the solar two project[J].Energy Storage,2002,65(5):162-168.
[10]Gabbrielli R,Zamparelli C.Optimal design of a molten salt thermal storage tank for parabolic trough solar power plants[J].Journal of Solar Energy Engineering,2009,131(4):041001-041011.
[11]Herrmann U,Kelly B,Price H.Two-tank molten salt storage for parabolic trough solar power plants[J].Energy,2004,29(5):883-893.
[12]Flueckiger S,Zhen Y,Garimella S.Review of molten-salt thermocline tank modeling for solar thermal energy storage[J].Heat Transfer Engineering,2013,34(10):787-800.
[13]孙晓丽,鹿院卫,崔锡民,等.熔融盐单罐储热系统释热传热规律研究[J].工程热物理学报,2016,V37(5):1032-1037.Sun X L,Lu Y W,Cui X M,et al.Heat discharge research of molten salt in single energy storage tank[J].Journal of Engineering Thermophysics,2016,V37(5):1032-1037.
[14]Haltiwanger J,Davidson J H.Discharge of a thermal storage tank using an immersed heat exchanger with an annular baffle[J].Solar Energy,2009,83(5):193-201.
[15]Liu W,Davidson J H,Mantell S C.et al.Natural convection from a horizontal tube heat exchanger immersed in a tilted enclosure[J].ASME Journal of Solar Energy,2003,125(1):67-75.
[16]Liu W,Davidson J H,Kulacki F A.Natural convection from a tube bundle in a thin inclined enclosure[J].ASME Journal of Solar Energy,2004,126(2):702-709.
[17]Liu W,Davidson J H,Kulacki F A.Thermal characterization of prototypical integral collector storage systems with immersed heat exchangers[J].ASME Journal of Solar Energy,2005,127(1):21-28.
[18]Yan S,Davidson J H.Transient natural convection heat transfer correlations for tube bundles immersed in a thermal storage[J].ASME Journal of Solar Energy,2007,129(2):210-214.
[19]Yan S,Davidson J H.Multi-zone porous medium model of the thermal and fluid processes during discharge of an inclined rectangular storage vessel via an immersed tube bundle[J].ASMEJournal of Solar Energy,2007,129(4):449-457.
[20]孙晓丽.单罐熔融盐蓄热与释热传热规律研究[D].北京:北京工业大学,2016.Sun X L.Study on charging and discharging process of molten salt in single thermal energy storage tank[D].Beijing:Beijing University of Technology,2016.
[21]Yan S,Davidson J H.Multi-zone porous medium model of the thermal and fluid processes during discharge of an inclined rectangular storage vessel via an immersed tube bundle[J].ASMEJournal of Solar Energy,2007,129(4):449-457.
[22]Li S,Zhang Y,Zhang K,et al.Study on performance of storage tanks in solar water heater system in charge and discharge progress[J].Energy Procedia,2014,48(48):384-393.
[23]Prabhanjan D G,Rennie T J,Raghavan G S V.Natural convection heat transfer from helical coiled tubes[J].International Journal of Thermal Sciences,2004,43(4):359-365.
[24]Wu Y T,Li Y,Lu Y W,et al.Novel low melting point binary nitrates for thermal energy storage applications[J].Solar Energy Materials&Solar Cells,2017,164(10):114-121.
[25]李英.低熔点二元混合熔盐传热蓄热介质的制备及热物性研究[D].北京:北京工业大学,2017.Li Y.Study of preparation and thermophysical properties of the low melting point binary mixed molten salts for heat transfer and storage[D].Beijing:Beijing University of Technology,2017.
[26]李英,吴玉庭,鹿院卫,等.二元混合硝酸盐相图的预测及热物性实验研究[J].太阳能学报,2018,39(2):435-440.Li Y,Wu Y T,Lu Y W,et al.Study of thermophysical properties and phase diagram prediction of binary mixed molten salts[J].Acta Energiae Solaris Sinica,2018,39(2):435-440.
[27]李鹏飞,徐敏义,王飞飞.精通CFD工程仿真与案例实战[M].北京:人民邮电出版社,2011.Li P F,Xu M Y,Wang F F.Proficient in CFD Engineering Simulation and Case Study[M].Beijing:People Post and Telecommunications Publishing House,2011.
[28]甘雪菲,何正斌,伊松林,等.石蜡相变储热系统的放热效率[J].农业工程学报,2012,28(2):222-225.Gan X F,He Z B,Yi W S,et al.Discharging efficiency of paraffin phase change heat storage system[J].Transactions of the CSAE,2012,28(2):222-225.
[29]中华人民共和国住房和城乡建设部.城市供热规划规范:GBT51074-2015[S].北京:中国建筑工业出版社,2015.Ministry of Housing and Urban-Rural Development of the People's Republic of China.Code for urban heating supply planning:GBT51074-2015[S].Beijing:China Architecture&Building Press,2015.
[30]Nicodemus J H,Jeffrey J,Haase J,et al.Effect of baffle and shroud designs on discharge of a thermal storage tank using an immersed heat exchanger[J].Solar Energy,2017,157(15):911-919.