Experimental study of wall-to-bed heat transfer in a supercritical water fluidized bed

被引:13
作者
Zhang, Tianning [1 ]
Lu, Youjun [1 ]
Yao, Liang [1 ]
机构
[1] Xi An Jiao Tong Univ, SKLMFPE, Xian 710049, Shaanxi, Peoples R China
基金
中国国家自然科学基金;
关键词
Supercritical water; Fluidized bed; Heat transfer; Experiment; HYDROGEN-PRODUCTION; BIOMASS GASIFICATION; NUMERICAL-SIMULATION; VERTICAL TUBE; PRESSURE; FLOW; MECHANISM; BEHAVIOR; BUNDLES; REACTOR;
D O I
10.1016/j.ijmultiphaseflow.2018.07.007
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
Supercritical water (SCW) fluidized bed is a new reactor concept for hydrogen production from biomass or coal gasification. This paper presents an experimental study of wall-to-bed heat transfer characteristics for Geldart-B particles in SCW fluidized bed with the conditions of pressure ranges from 22.3 MPa to 25.7 MPa and temperature ranges from 651 K to 730K. The effects of velocity, temperature and pressure on wall-to-bed heat transfer coefficient in SCW fluidized bed were discussed. The wall-to-bed heat transfer coefficient was found to be positively correlated with velocity and pressure, while negatively correlated with temperature within present experimental conditions. A dimensionless analysis was conducted using the Buckingham-theorem to derive the general form of an empirical wall-to-bed heat-transfer correlation in supercritical water fluidized bed for the Nusselt number, which was finalized based on the experimental data. What's more, the sold phase contributes more to the wall-to-bed heat transfer in SCW fluidized bed and the presence of solid phase enhances the heat transfer of SCW phase, which can be concluded from comparison of heat transfer between SCW fluidized bed and single phase of SCW. The experimental results and the proposed correlation in present work are useful for the design of SCW fluidized bed reactor. (C) 2018 Elsevier Ltd. All rights reserved.
引用
收藏
页码:26 / 34
页数:9
相关论文
共 47 条
[1]  
[Anonymous], 2013, ZUSTANDSGROSSEN WASS
[2]   Biomass gasification in supercritical water [J].
Antal, MJ ;
Allen, SG ;
Schulman, D ;
Xu, XD ;
Divilio, RJ .
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, 2000, 39 (11) :4040-4053
[3]  
Bishop A.A., 1964, HIGH TEMPERATURE S 4
[4]  
Botterill J. S. M, 1968, BR CHEM ENG, V13, P1000
[5]   Evaluation of effective thermal conductivity from the structure of a packed bed [J].
Cheng, GJ ;
Yu, AB ;
Zulli, P .
CHEMICAL ENGINEERING SCIENCE, 1999, 54 (19) :4199-4209
[6]   Hydrogen production from glycerol by supercritical water gasification in a continuous flow tubular reactor [J].
Guo, Simao ;
Guo, Liejin ;
Cao, Changqing ;
Yin, Jiarong ;
Lu, Youjun ;
Zhang, Ximin .
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 2012, 37 (07) :5559-5568
[7]  
Gupta C.K., 1998, Fluid bed technology in materials processing
[8]   Correlations for the prediction of heat transfer to liquid-solid fluidized beds [J].
Haid, M .
CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION, 1997, 36 (02) :143-147
[9]   Hydrogen production from glucose used as a model compound of biomass gasified in supercritical water [J].
Hao, XH ;
Guo, LJ ;
Mao, X ;
Zhang, XM ;
Chen, XJ .
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 2003, 28 (01) :55-64
[10]   Assessment of performance of turbulence models in predicting supercritical pressure heat transfer in a vertical tube [J].
He, S. ;
Kim, W. S. ;
Bae, J. H. .
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 2008, 51 (19-20) :4659-4675