Heat Storage/Heat Release of Phase-Change Filling Body with Casing Heat Exchanger for Extracting Geothermal Energy

  • ZHANG Xiaoyan ,
  • XU Muyan ,
  • LIU Lang ,
  • YANG Qixing ,
  • KI-IL Song
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  • 1. Energy School, Xi’an University of Science and Technology, Xi’an 710054, China
    2. Key Laboratory of Western Mines and Hazards Prevention, Ministry of Education of China, Xi’an 710054, China
    3. Department of Civil Engineering, Inha University, Incheon 402-751, South Korea

网络出版日期: 2023-11-22

基金资助

This research was supported by the National Natural Science Foundation of China (Nos. 51974225, 51674188, 51874229, 51504182, 51904224, 51904225, 51704229), Shaanxi Innovative Talents Cultivate Program-New-star Plan of Science and Technology (No. 2018KJXX-083), Natural Science Basic Research Plan of Shaanxi Province of China (Nos. 2018JM5161, 2018JQ5183, 2015JQ5187, 2019JM-074), Scientific Research Program funded by the Shaanxi Provincial Education Department (Nos. 15JK1466, 19JK0543), China Postdoctoral Science Foundation (No. 2015M582685), Outstanding Youth Science Fund of Xi’an University of Science and Technology (No. 2018YQ2-01) and the Scientific Research Program funded by Xi’an Science and Technology Bureau (No. 201805036YD14CG20).

版权

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2023

Heat Storage/Heat Release of Phase-Change Filling Body with Casing Heat Exchanger for Extracting Geothermal Energy

  • ZHANG Xiaoyan ,
  • XU Muyan ,
  • LIU Lang ,
  • YANG Qixing ,
  • KI-IL Song
Expand
  • 1. Energy School, Xi’an University of Science and Technology, Xi’an 710054, China
    2. Key Laboratory of Western Mines and Hazards Prevention, Ministry of Education of China, Xi’an 710054, China
    3. Department of Civil Engineering, Inha University, Incheon 402-751, South Korea

Online published: 2023-11-22

Supported by

This research was supported by the National Natural Science Foundation of China (Nos. 51974225, 51674188, 51874229, 51504182, 51904224, 51904225, 51704229), Shaanxi Innovative Talents Cultivate Program-New-star Plan of Science and Technology (No. 2018KJXX-083), Natural Science Basic Research Plan of Shaanxi Province of China (Nos. 2018JM5161, 2018JQ5183, 2015JQ5187, 2019JM-074), Scientific Research Program funded by the Shaanxi Provincial Education Department (Nos. 15JK1466, 19JK0543), China Postdoctoral Science Foundation (No. 2015M582685), Outstanding Youth Science Fund of Xi’an University of Science and Technology (No. 2018YQ2-01) and the Scientific Research Program funded by Xi’an Science and Technology Bureau (No. 201805036YD14CG20).

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2023

摘要

相变蓄能充填是一种新型的高效地热能提取及矿井充填技术。本文建立了用于深井采热的三维非稳态相变蓄能充填体模型,研究了同心套管换热器环形空间封装七种不同的回填材料在蓄/释热两种工况下对充填体传热性能、相变材料相变过程及换热器效率的影响。结果表明:充填体蓄热过程主要集中在前5 h,且围岩传热是影响蓄热的主要因素,由于与围岩和采场距离的不同,充填体内部不同测点温度及其增长趋势呈现不同的情况。环形空间材料相变主要集中在2-5 h,且内部测点温度受相变材料及测点位置影响表现出不同的变化趋势,RT28、酸和强 酸在相变过程中温度基本保持不变,能看到明显的相变平台。不同回填材料的蓄/释热速率及其减小幅度有着明显差别,且在蓄/释热前期差别尤其明显。相变回填可以明显提高充填体的蓄热能力,经过10h的蓄热期,相变回填蓄热量的增加幅度在36.60%-67.26%,其中CaCl2·6H2O和RT28增长幅度更大,分别比普通回填多蓄存67.27%、55.84%的热量。虽然PCM回填可以在一定程度上提高换热量,但是如果相变材料的导热系数过低将会导致系统运行效率的降低,释热10 h期间,RT28、RT35和酸回填的平均能效系数只有0.049。本文为充填体内设换热器中回填材料的选择提供参考。

本文引用格式

ZHANG Xiaoyan , XU Muyan , LIU Lang , YANG Qixing , KI-IL Song . Heat Storage/Heat Release of Phase-Change Filling Body with Casing Heat Exchanger for Extracting Geothermal Energy[J]. 热科学学报, 2023 , 32(3) : 1171 -1189 . DOI: 10.1007/s11630-023-1689-y

Abstract

Arranging heat exchanger in filling body to extract geothermal energy is an effective way to alleviate the problems of high ground pressure and high ground temperature in deep resource exploitation. Filling body with casing heat exchanger was acted as research object, encapsulating phase change materials (PCMs) in annular space. During heat storage and heat release process, the effects of different PCMs on temperature distribution, phase-change process and heat transfer performance were studied. The result indicates: During heat storage process, the temperature increases rapidly and the melting process is accelerated for the position closer surrounding rock. CaCl2∙6H2O/EG can make filling body complete heat storage process in the shortest time because of its good thermal diffusivity. The heat storage capacity of PCMs backfill is significantly higher than that of ordinary backfill; it increases by 36.6%–67.3% at heat storage of 10 h. During heat release process, the closer to the heat exchange tube, the greater the temperature drop in filling body. The maximum value of heat release rate and heat release capacity is in CaCl2∙6H2O/EG backfill, it can release 116.4% more heat than RT35 backfill after heat release of 12 h, the maximum value of effectiveness and its heat transfer rate also is in CaCl2∙6H2O/EG backfill. This paper provides the basic data for the selection of PCMs in phase-change thermal storage filling body.

参考文献

[1] He M., Guo P., Thermodynamic effects of deep rock mass and temperature control countermeasures. Chinese Journal of Rock Mechanics and Engineering, 2013, 32(12): 2377–2393.
[2] He M., Cao X., Xie Q., et al., Principles and technology for stepwise utilization of resources for mitigating deep mine heat hazards. Mining Science and Technology, 2010, 20(01): 20–27.
[3] Wu D., Hou Y., Deng T., et al., Thermal, hydraulic and mechanical performances of cemented coal gangue-fly ash backfill. International Journal of Mineral Processing, 2017, 162: 12–18.
[4] Cui L., Fall M., An evolutive elasto-plastic model for cemented paste backfill. Computers and Geotechnics, 2016, 71: 19–29.
[5] Yang X., Han Q., Pang J., et al., Progress of heat-hazard treatment in deep mines. Mining Science and Technology (China), 2011, 21: 295–299.
[6] Ghirian A., Fall M., Coupled thermo- hydro-mechanical-chemical behaviour of cemented paste backfill in column experiments. Part I: Physical, hydraulic and thermal processes and characteristics. Engineering Geology, 2013, 164: 195–207.
[7] Dai C., Li J., Shi Y., et al., An experiment on heat extraction from a deep geothermal well using a downhole coaxial open loop design. Applied Energy, 2019, 252: 113447.
[8] Ghoreishi-Madiseh S., Hassani F., Abbasy F., Numerical and experimental study of geothermal heat extraction from backfilled mine stopes. Applied Thermal Engineering, 2015, 90: 1119–1130.
[9] Liu L., Xin J., Zhang B., et al., Basic theory and application exploration of functional filling in mines. Chinese Journal of Coal Science, 2018, 43: 1811–1820.
[10] Chen L., Liu L., Zhang B., et al., Mechanism of backfill thermal utilization adsorption cooling system in deep mine. Journal of China Coal Society, 2018, 43(2): 483–489.
[11] Wang M., Liu L., Zhang X., et al., Experimental and numerical investigations of heat transfer and phase change characteristics of cemented paste backfill with PCM. Applied Thermal Engineering, 2019, 150: 121– 131.
[12] Wang M., Liu L., Chen L., et al., Cold load and storage functional backfill for cooling deep mine. Advances in Civil Engineering, 2018, 2018: 8.
[13] Zhang Y., Wang M., Hao G., Thermomechanical analysis of system used to cooling and dehumidity in mine. Journal of China Coal Society, 2016, 35(10): 146–148.
[14] Zhang X., Jia Y., Wang M., et al., Experimental research on heat transfer and strength analysis of backfill with ice grains in deep mines. Sustainability, 2019, 11(9): 2486.
[15] Zhang X., Liu L., Liu L., et al., Numerical simulation of heat release performance of filling body under condition of heat extracted by fluid flowing in buried tube. Journal of Central South University, 2019, 26(8): 2160–2174.
[16] Tian Y., Zhao C., A numerical investigation of heat transfer in phase change materials (PCMs) embedded in porous metals. Energy, 2011, 36(9): 5539–5546.
[17] Jegadheeswaran S., Pohekar S., Performance enhancement in latent heat thermal storage system: A review. Renewable and Sustainable Energy Reviews, 2009, 13(9): 2225–2244.
[18] Wu J., Feng Y., Liu C., et al., Heat transfer characteristics of an expanded graphite/paraffin PCM-heat exchanger used in an instantaneous heat pump water heater. Applied Thermal Engineering, 2018, 142: 644–655.
[19] Assael M., Antoniadis K., Wakeham W., et al., Potential applications of nanofluids for heat transfer. International Journal of Heat and Mass Transfer, 2019, 138: 597–607.
[20] Kim D., Kim G., Kim D., et al., Experimental and numerical investigation of thermal properties of cement-based grouts used for vertical ground heat exchanger. Renewable Energy, 2017, 112: 260–267.
[21] Erol S., François B., Efficiency of various grouting materials for borehole heat exchangers. Applied Thermal Engineering, 2014, 70(1): 788–799.
[22] Javadi H., Ajarostaghi S., Rosen M., et al., Performance of ground heat exchangers: A comprehensive review of recent advances. Energy, 2019, 178: 207–233.
[23] Qi D., Pu L., Sun F., et al., Numerical investigation on thermal performance of ground heat exchangers using phase change materials as grout for ground source heat pump system. Applied Thermal Engineering, 2016, 106: 1023–1032.
[24] Bottarelli M., Bortoloni M., Su Y., Heat transfer analysis of underground thermal energy storage in shallow trenches filled with encapsulated phase change materials. Applied Thermal Engineering, 2015, 90: 1044–1051.
[25] Li X., Tong C., Duanmu L., et al., Research on U-tube heat exchanger with shape-stabilized phase change backfill material. Procedia Engineering, 2016, 146: 640– 647.
[26] Chen F., Mao J., Chen S., et al., Efficiency analysis of utilizing phase change materials as grout for a vertical U-tube heat exchanger coupled ground source heat pump system. Applied Thermal Engineering, 2018, 130: 698– 709.
[27] Zhang X., Xu M., Liu L., et al., Experimental study on thermal and mechanical properties of cemented paste backfill with phase change material. Journal of Materials Research and Technology, 2020, 9(2): 2164–2175.
[28] Cao S., Application of phase change energy storage material RT28 in building walls. Anhui Jianzhu University, 2015.
[29] Ebrahimi A., Hosseini M., Ranjbar A., et al., Melting process investigation of phase change materials in a shell and tube heat exchanger enhanced with heat pipe. Renewable Energy, 2019, 138: 378–394.
[30] Liu L., Research on the Performance of U-tube heat exchanger with shape-stabilized PCM. Dalian University of Technology, 2015.
[31] Samanta H., Roy P., Barman N., Modeling of solidification of CCHH (CaCl2, 6H2O) in a shell- and-tube PCM based heat storage unit. Procedia Engineering, 2015, 127: 816–823.
[32] Ye R., Lin W., Fang X., et al., A numerical study of building integrated with CaCl2·6H2O/expanded graphite composite phase change material. Applied Thermal Engineering, 2017, 126: 480–488.
[33] Fakheri A., Efficiency analysis of heat exchangers and heat exchanger networks. International Journal of Heat and Mass Transfer, 2014, 76: 99–104.
[34] Brent A., Voller V., Reid K., Enthalpy-porosity technique for modeling convection-diffusion phase change: Application to the melting of a pure metal. Numerical Heat Transfer, Part A: Applications, 1988, 13(3): 297– 318.
[35] Lei H., Analytical and experimental study of phase change materials used as backfill material for borehole heat exchanger, Tianjin University, Tianjin, 2009.


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