气-固循环流化床换热器的传热性能与压降

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摘要为强化气相换热，将流化床换热防垢节能技术和气相换热过程相结合，设计并构建了一套气-固循环流化床换热装置。以空气和玻璃珠颗粒作为工质，利用热电阻和差压传感器，系统地考察了颗粒加入量、空气流量和热通量等操作参数对于其传热性能和压降的影响。研究结果表明，玻璃珠颗粒的加入可以明显地强化气相的传热。实验范围内，最大的传热增强因子为33.4%，所对应的操作参数为ε=1.5%，V_g=19.78 m³·h^-1和q=1 kW·m^-2，相应的压降比率不超过2.5%。传热增强因子随颗粒加入量和空气流量的增加呈现出波动的趋势。空气流量较低时，传热增强因子随着热通量的增加而增大；随着空气流量的增加，热通量对传热增强因子的影响减小。构建了操作参数对传热性能和压降影响的三维图，以利于选择适宜的操作参数范围。研究结果有利于流化床换热防垢节能技术在气相换热过程中的应用。

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	姜峰
	韩妮莎
	齐国鹏
	王锦锦
	李修伦

关键词：强化传热；气-固两相流；循环流化床换热器；压降

Abstract： A gas-solid circulating fluidized bed heat-exchange apparatus is designed and built to enhance heat transfer by combining the fluidized bed heat transfer and fouling prevention technology with gas-phase heat-exchange process. Air and glass bead particles are selected as the working media. The effect of operating parameters, such as the amount of added particles, air flow rate and heat flux, on the heat transfer performance and pressure drop are investigated by using resistance temperature detectors and differential pressure transmitter. Results show that the addition of the glass beads can significantly enhance heat transfer. The heat transfer enhancement factor reaches 33.4% at ε=1.5%,V_g=19.78 m³·h^-1 and q=1 kW·m^-2, and the corresponding pressure drop ratio does not exceed 2.4%. The heat transfer enhancing factor fluctuates with the increase in the amount of added particles and air flow rate. At low air flow rate, the enhancing factor increases with the increase in heat flux. With the increase in air flow rate, the effects of heat flux on the enhancing factor decreases. With the increase in the amount of added particles, the pressure drop ratio fluctuates at low air flow rate, but increases at high air flow rate. The pressure drop ratio fluctuates with the increase in air flow rate, depending on the amount of added particles and heat flux. Heat flux has a little effect on the pressure drop ratio. The three-dimensional diagrams are established to show the effect of the operating parameters on the heat transfer performance and pressure drop. These findings are beneficial to the industrial application of the fluidized bed heat transfer and fouling prevention technology in the gas-phase heat-exchange process.

Keywords： heat transfer enhancement； gas-solid two-phase flow； circulating fluidized bed heat exchanger； pressure drop

Received 2020-06-04;

Fund:化学工程国家重点实验室开放项目（SKLCHE-18B03），天津市科技支撑计划重点项目（99ZCKFGX01900）。

Corresponding Authors: 姜峰,E-mail:jiangfeng@tju.edu.cn。 Email: jiangfeng@tju.edu.cn

About author: 姜峰(1975-),男,博士,副教授,现从事多相流强化传热与防、除垢方面的研究。

引用本文:

姜峰, 韩妮莎, 齐国鹏, 王锦锦, 李修伦.气-固循环流化床换热器的传热性能与压降[J]. 化学工业与工程, 2021,38(3): 36-48

Jiang Feng, Han Nisha, Qi Guopeng, Wang Jinjin, Li Xiulun.Heat Transfer Performance and Pressure Drop of a Gas-solid Circulating Fluidized Bed Heat Exchanger[J]. Chemcial Industry and Engineering, 2021,38(3): 36-48

[1] Yiagopoulos A, Yiannoulakis H, Dimos V, et al. Heat and mass transfer phenomena during the early growth of a catalyst particle in gas-phase olefin polymerization:The effect of prepolymerization temperature and time[J]. Chemical Engineering Science, 2001, 56(13):3979-3995
[2] Yuan C, Xu Y, Zhang T, et al. Experimental investigation of the phase fraction of wet gas based on convective heat transfer[J]. Applied Thermal Engineering, 2017, 110:102-110
[3] Meng T, Cheng K, Zhao F, et al. Computational flow and heat transfer design and analysis for 1/12 gas-cooled space nuclear reactor[J]. Annals of Nuclear Energy, 2020, 135:106986
[4] Cablé A, Georges L, Peigné P, et al. Evaluation of a new system combining wood-burning stove, flue gas heat exchanger and mechanical ventilation with heat recovery in highly-insulated houses[J]. Applied Thermal Engineering, 2019, doi:10.1016/j.applthermaleng.2019.04.103
[5] Cheng H, Xie J, Li J. Determination of surface heat-transfer coefficients of steel cylinder with phase transformation during gas quenching with high pressures[J]. Computational Materials Science, 2004, 29(4):453-458
[6] Duy V N, Duc K N, Cong D N, et al. Experimental study on improving performance and emission characteristics of used motorcycle fueled with ethanol by exhaust gas heating transfer system[J]. Energy for Sustainable Development, 2019, 51:56-62
[7] 刘传平, 李传, 李永亮, 等. 气固两相流强化传热研究进展[J]. 化工学报, 2014, 65(7):2485-2494 Liu Chuanping, Li Chuan, Li Yongliang, et al. Heat transfer enhancement in gas-solid flow[J]. Journal of Chemical Industry and Engineering (China), 2014, 65(7):2485-2494(in Chinese)
[8] Paz C, Suarez E, Eiris A, et al. Development of a predictive CFD fouling model for diesel engine exhaust gas systems[J]. Heat Transfer Engineering, 2013, 34:674-682
[9] Li K, Wang S, Ke Z, et al. A novel caudal-fin-inspired hourglass-shaped self-agitator for air-side heat transfer enhancement in plate-fin heat exchanger[J]. Energy Conversion and Management, 2019, 187:297-315
[10] 徐百平, 雷鸣,吴雪. 气-气波纹板换热器强化传热研究[J]. 石油化工设备, 2000, 29(4):5-7 Xu Bai ping, Lei Ming, Wu Xue. Research on heat transfer enhancement of gas-gas corrugated plate heat exchanger[J]. Petro-Chemical Equipment, 2000, 29(4):5-7(in Chinese)
[11] 徐百平, 夏建波, 雷鸣, 等. 高效气-气换热波纹板换热器强化传热的研究[J]. 石油化工设备技术, 2001, 22(1):33-35, 38 Xu Baiping, Xia Jianbo, Lei Ming, et al. Research on strengthening heat transfer of corrugated plate heat exchanger for high efficiency gas-gas heat transfer[J]. Petroleum Chemicial and Industry Equipment Technology, 2001, 221):33-35, 38(in Chinese)
[12] 夏德宏, 张艳, 尚迎春, 等. 基于气侧强化换热技术的间壁式气体-散料换热器[J]. 冶金能源, 2010, 29(5):47-50 Xia Dehong, Zhang Yan, Shang Yingchun, et al. Indirect heat exchanger of gas and fine-powder based on heat transfer enhancement in gas side[J]. Energy for Metallurgical Industry, 2010, 29(5):47-50(in Chinese)
[13] Li Y, Wang S, Zhao Y. Experimental study on heat transfer enhancement of gas tube partially filled with metal foam[J]. Experimental Thermal and Fluid Science, 2018, 97:408-416
[14] Gerken I, Brandner J J, Dittmeyer R. Heat transfer enhancement with gas-to-gas micro heat exchangers[J]. Applied Thermal Engineering, 2016, 93:1410-1416
[15] Dai C, Zeng L, Lei H. Heat transfer enhancement based on single phase natural circulation loops[J]. International Journal of Heat and Mass Transfer, 2020, doi:10.1016/j.ijheatmasstransfer. 2020.119601
[16] Tang L, Du X, Pan J, et al. Air inlet angle influence on the air-side heat transfer and flow friction characteristics of a finned oval tube heat exchanger[J]. International Journal of Heat and Mass Transfer, 2019, doi:10.1016/j.ijheatmasstransfer.2019.118702
[17] Pronk P, Infante Ferreira C A, Witkamp G J. Prevention of fouling and scaling in stationary and circulating liquid-solid fluidized bed heat exchangers:Particle impact measurements and analysis[J]. International Journal of Heat and Mass Transfer, 2009, 52(15/16):3857-3868
[18] Arumemi-Ikhide M, Sefiane K, Duursma G, et al. Investigation of flow boiling in circulating three-phase fluidised bed:Part I:Experiments and results[J]. Chemical Engineering Science, 2008, 63(4):881-895
[19] Arumemi-Ikhide M, Sefiane K, Duursma G, et al. Investigation of flow boiling in circulating three-phase fluidised bed:Part II:Theoretical correlation[J]. Chemical Engineering Science, 2008, 63(4):896-914
[20] Masoumifard N, Mostoufi N, Hamidi A A, et al. Investigation of heat transfer between a horizontal tube and gas-solid fluidized bed[J]. International Journal of Heat and Fluid Flow, 2008, 29(5):1504-1511
[21] Bisognin P C, C?mara Bastos J C S, Meier H F, et al. Influence of different parameters on the tube-to-bed heat transfer coefficient in a gas-solid fluidized bed heat exchanger[J]. Chemical Engineering and Processing-Process Intensification, 2020, doi:10.1016/j.cep. 2019.107693
[22] Wagialla K M, Elnashaie S S, Fakeeha A H. Review on heat transfer in gas solid fluidized beds[J]. Journal of King Saud University-Engineering Sciences, 1990, 2(2):331-345
[23] Taofeeq H, Al-Dahhan M. Investigation of the effect of vertical immersed tube diameter on heat transfer in a gas-solid fluidized bed[J]. International Journal of Thermal Sciences, 2019, 135:546-558
[24] Merzsch M, Lechner S, Krautz H J. Heat-transfer from single horizontal tubes in fluidized beds:Influence of tube diameter, moisture and diameter-definition by Geldart C fines content[J]. Powder Technology, 2013, 235:1038-1046
[25] Wang X, Guo Y, Shu P. Investigation into gas-solid heat transfer in a cryogenic vibrated fluidised bed[J]. Powder Technology, 2004, 139(1):33-39
[26] Bellan S, Matsubara K, Cho H S, et al. A CFD-DEM study of hydrodynamics with heat transfer in a gas-solid fluidized bed reactor for solar thermal applications[J]. International Journal of Heat and Mass Transfer, 2018, 116:377-392
[27] Lattanzi A M, Yin X, Hrenya C M. A hybrid lattice Boltzmann-random walk method for heat transfer in gas-solids systems[J]. Journal of Computational Physics:X, 2019, doi:10.1016/j.jcpx.2019.100007
[28] Wen J, Zhou H, Li X. Performance of a new vapor-liquid-solid three-phase circulating fluidized bed evaporator[J]. Chemical Engineering and Processing:Process Intensification, 2004, 43(1):49-56
[29] Liu M, Yang Y, Li X, et al. Concentration of gengnian'an extract with a vapor-liquid-solid evaporator[J]. AIChE Journal, 2005, 51(3):759-765
[30] Kollbach J, Dahm W D I, Rautenbach R. Continuous cleaning of heat exchanger with recirculating fluidized bed[J]. Heat Transfer Engineering, 1987, doi:10.1080/01457638708962813
[31] Hu X, Xu T, Li C, et al. Catalytic cracking of n-heptane under activation of lattice oxygen in a circulating fluidized bed unit[J]. Chemical Engineering Journal, 2011, 172(1):410-417
[32] 姜峰, 王兵兵, 齐国鹏, 等. 汽-液-固多管循环流化床蒸发器中固体颗粒的分布[J]. 天津大学学报, 2013,46(2):133-137 Jiang Feng, Wang Bingbing, Qi Guopeng, et al. Solid particle distribution in vapor-liquid-solid multi-pipe circulating fluidized bed evaporator[J]. Journal of Tianjin University (Science and Technology), 2013,46(2):133-137(in Chinese)
[33] 贾文婷, 姜峰, 齐国鹏, 等. 汽-液-固循环流化床蒸发器热效率的实验研究[J]. 化学工业与工程, 2015, 32(4):39-43 Jia Wenting, Jiang Feng, Qi Guopeng, et al. Thermal efficiency in the vapor-liquid-solid multi-pipe circulating fluidized bed evaporator[J]. Chemical Industry and Engineering, 2015, 32(4):39-43(in Chinese)
[34] Jiang F, Yang M, Qi G, et al. Heat transfer and antiscaling performance of a Na₂SO₄ circulating fluidized bed evaporator[J]. Applied Thermal Engineering, 2019, 155:123-134
[35] Jiang F, Feng Q, Qi G, et al. Flow boiling in a downflow circulating fluidized bed evaporator[J]. Applied Thermal Engineering, 2019, 156:359-370
[36] Zhang H, Baeyens J, Degrève J, et al. The convection heat transfer coefficient in a Circulating Fluidized Bed (CFB)[J]. Advanced Powder Technology, 2014, 25(2):710-715
[37] Dutta A, Basu P. An investigation on heat transfer to the standpipe of a circulating fluidized bed boiler[J]. Chemical Engineering Research and Design, 2003, 81(8):1003-1014
[38] Moon H, Choi S, Park Y K, et al. Thermal-fluid characteristics on near wall of gas-solid fluidized bed reactor[J]. International Journal of Heat and Mass Transfer, 2017, 114:852-865
[39] Zhao T, Liu K, Murata H, et al. Investigation of bed-to-wall heat transfer characteristics in a rolling circulating fluidized bed[J]. Powder Technology, 2015, 269:46-54
[40] Murata H, Oka H, Adachi M, et al. Effects of the ship motion on gas-solid flow and heat transfer in a circulating fluidized bed[J]. Powder Technology, 2012, 231:7-17
[41] Wanchan W, Khongprom P, Limtrakul S. Study of wall-to-bed heat transfer in circulating fluidized bed riser based on CFD simulation[J]. Chemical Engineering Research and Design, 2020, 156:442-455
[42] Monji H, Matsui G, Saito T. Pressure drop reduction of liquid-particles two-phase flow with nearly equal density[J]. Multiphase Flow, 1995, 7(2):355-365