Optimization Of Heat Transfer And Thermal Storage Medium For The System Of Hydrogen Production From Biomass In Supercritical Water By Concentrated Solar Energy

Solar energy has many advantages such as abundant reserves, wide distributionand renewable, but its shortcomings that low energy density, discontinued andinstability limit the large-scale development and application in a great extent. Hydrogenis a kind of clean secondary energy with high energy density, there is no carbon dioxideemission in the life cycle of biomass energy, that transform biomass into hydrogen byheating of solar energy may realize the sustainable conversion and use of energy. Thisresearch has important scientific significance and potential value of application.Hydrogen production from biomass in supercritical water by concentrated solarenergy is a hot topic in recent years. Heat transfer and thermal storage medium is animportant part of the hydrogen production system, and its performances of heattransfer and thermal storage will have a direct impact on the effect of biomassgasification, the researchers consider the high temperature melt salt as heat transferheat storage medium. In this paper, a lot of inorganic molten salts which are rich andsmall effects to the body and the environment were chosen. The physical parameters ofpure molten salts in liquid were calculated. Molten salts which are good performancewere chosen through the comparison of their thermal physical parameters. Thephysical parameters of molten salt mixtures were calculated with simple mixing rule,contrasting the measured value with calculated value of molten salt mixtures, it can befind that the calculation results by simple mixing rule are effective, and that themelting temperature of molten salts mixture system0.33Na2CO3-0.35K2CO3-0.32Li2CO3is lower, and its density, specific heat, coefficient of thermal conductivityare suitable for the system of hydrogen production from biomass in supercritical waterby concentrated solar energy as heat transfer and thermal storage medium. In this paper the physical parameters of several categories of molten salt aresummed up, the screening method can give the researchers a intuitive understanding tothe performance of the salts quickly. The results have some guiding value for thefurther optimization, design and application of molten salt system.