Hydrogen Production By Gasification Of Biomass And Coal In Supercritical Water

Coal and biomass are two main energy resources in China, but coal and biomassare used mainly in direct combustion, leading to low utilization efficiency，while coalresult in serious environment pollution. So how to use coal and biomass efficiently andcleanly becomes more and more significant. Hydrogen is a kind of storable andtransportable clean energy. Converting biomass and coal into hydrogen-rich gases insupercritical water can not only improve the efficiency of utilizing biomass and coal butalso reduce pollutants, which is an economic and efficient approach to producinghydrogen energy.Firstly, the simulation of hydrogen production from methanol gasification insupercritical water is carried out by using Aspen Plus software. Comparing withexperiment data used for model verification. Then the energy and exergy of the processis analyzed based on reaction data. The effects of main parameters temperature, pressureand feed concentration are investigated, which reveals the main factors during thereaction process. Afterwards, the simulation and experimental comparison of biomassand coal co-gasified in supercritical are carried out. The quantities effects oftemperature, pressure and the quality of the biomass/coal ratio are studied. In this paper,it shows that the major proctor gases are H2, CO2, CH4and CO during the reaction, andthe temperature and feed concentration play an important role on the gasification ofbiomass and coal in supercritical water for hydrogen production. Meanwhile thesynergistic effect of corn cob and coal gasification is found under the condition oftemperature at650℃and pressure at25MPa. The best gasification performance isobtained when the ratio of corn cob to coal is4:1, which is agreed with experimentresult.In this paper, the mass and energy analysis of the process of hydrogen productionfrom biomass and coal gasification in supercritical water has been carried out, whichreveals the characteristics of mass and energy conversion and provides some basis andsupport for designing and optimizing the experiments and equipments of thistechnology.