Continuous hydrogen production by biomass gasification in supercritical water heated by molten salt flow: System development and reactor assessment

Abstract Hydrogen production by biomass gasification using solar energy is a promising approach for overcoming the drawbacks of fossil fuel utilization, but the storage of discontinuous solar flux is a critical issue for continuous solar hydrogen production. A continuous hydrogen production system by biomass gasification in supercritical water using molten-salts-stored solar energy was proposed and constructed. A novel double tube helical heat exchanger was designed to be molten salts reactor for hydrogen production. Model compounds (glycerol/glucose) and real biomass (corn cob) were successfully gasified in this molten salts reactor for producing hydrogen-rich gas. The unique temperature profiles of biomass slurry in the reactor were observed and compared with that of conventional electrical heating and direct solar heating approaches. Product gases yield, gasification efficiency and exergy conversion efficiency of the reactor were analyzed. The results showed that the performances of reactor were determined by feedstock style, biomass concentration, residence time and biomass slurry temperature profiles.

[1]  Michael Jerry Antal,et al.  Carbon-Catalyzed Gasification of Organic Feedstocks in Supercritical Water† , 1996 .

[2]  P. Madden,et al.  Heat-transport properties of molten fluorides: Determination from first-principles , 2009 .

[3]  Antonio Cammi,et al.  Molten salt mixture properties in RELAP5 code for thermodynamic solar applications , 2008 .

[4]  J. Tester,et al.  Oxidation of hydrogen and carbon monoxide in sub- and supercritical water: reaction kinetics, pathways, and water-density effects. 2. Elementary reaction modeling , 1994 .

[5]  A. Kruse,et al.  Biomass Gasification in Supercritical Water: Influence of the Dry Matter Content and the Formation of Phenols , 2003 .

[6]  M Lundberg.  Model calculations on some feasible two-step water splitting processes , 1993 .

[7]  In-Gu Lee,et al.  Gasification of Glucose in Supercritical Water , 2002 .

[8]  Liejin Guo,et al.  Hydrogen production from glycerol by supercritical water gasification in a continuous flow tubular reactor , 2012 .

[9]  Y. R. Mayhew,et al.  Heat transfer and pressure loss in helically coiled tubes with turbulent flow , 1964 .

[10]  H. P. Garg,et al.  Solar Thermal Energy Storage , 1985 .

[11]  Abraham Kogan.  Direct solar thermal splitting of water and on site separation of the products I. Theoretical evaluation of hydrogen yield , 1997 .

[12]  Liejin Guo,et al.  Hydrogen production by biomass gasification in supercritical water: A systematic experimental and analytical study , 2007 .

[13]  Igor Pioro,et al.  Heat transfer to supercritical fluids flowing in channels—empirical correlations (survey) , 2004 .

[14]  Chong-fang Ma,et al.  Experimental study on optimized composition of mixed carbonate salt for sensible heat storage in solar thermal power plant , 2011 .

[15]  Liejin Guo,et al.  Thermodynamic analysis of hydrogen production from biomass gasification in supercritical water , 2006 .

[16]  Liejin Guo,et al.  Hydrogen production by coal gasification in supercritical water with a fluidized bed reactor , 2010 .

[17]  Liejin Guo,et al.  Hydrogen production from coal gasification in supercritical water with a continuous flowing system , 2010 .

[18]  Liejin Guo,et al.  Thermodynamic modeling and analysis of biomass gasification for hydrogen production in supercritical water , 2007 .

[19]  Liejin Guo,et al.  Hydrogen production by biomass gasification in supercritical water using concentrated solar energy: System development and proof of concept , 2010 .

[20]  Jaehoon Kim,et al.  High-yield hydrogen production from glucose by supercritical water gasification without added catalyst , 2012 .

[21]  Robert Palumbo,et al.  Solar Thermochemical Process Technology , 2003 .

[22]  Ibrahim Dincer,et al.  Thermodynamic analysis of solar energy use for reforming fuels to hydrogen , 2011 .

[23]  Andrea Kruse,et al.  Influence of the Heating Rate and the Type of Catalyst on the Formation of Key Intermediates and on the Generation of Gases During Hydropyrolysis of Glucose in Supercritical Water in a Batch Reactor , 2004 .

[24]  Liejin Guo,et al.  Technical and economic evaluation of solar hydrogen production by supercritical water gasification of biomass in China , 2011 .

[25]  Piyush Sabharwall,et al.  Engineering Database of Liquid Salt Thermophysical and Thermochemical Properties , 2010 .

[26]  Michael Jerry Antal,et al.  Pyrolytic sources of hydrocarbons from biomass , 1985 .

[27]  Aldo Steinfeld,et al.  Solar hydrogen production by thermal decomposition of natural gas using a vortex-flow reactor , 2004 .

[28]  Hassan E.S. Fath,et al.  Technical assessment of solar thermal energy storage technologies , 1998 .

[29]  M. Kluth,et al.  Hydrothermal gasification of biomass and organic wastes , 2000 .

[30]  Liejin Guo,et al.  Hydrogen production by biomass gasification in supercritical water with a fluidized bed reactor , 2008 .

[31]  Kj Krzysztof Ptasinski,et al.  Thermodynamics of gas-char reactions: first and second law analysis , 2003 .

[32]  Xiaohong Hao,et al.  Hydrogen production by biomass gasification in supercritical water: A parametric study , 2006 .

[33]  Liejin Guo,et al.  Transient convective heat transfer in a helical coiled tube with pulsatile fully developed turbulent flow , 1998 .

[34]  R. J. Divilio,et al.  Biomass gasification in supercritical water , 2000 .