Energy And Exergy Analysis Of Biomass Gasification In Supercritical Water

Hydrogen will be the end energy resource with cleaness, transportation and deposition in the 21 century. The development of bioenergy and hydrogen energy will not only change the structure of energy resources, but also fit the necessary for clean energy resources. As a high efficient conversion technology, the hydrogen production form biomass gasification in supercritical water (SCW) disposes wet biomass with high moisture content and has no need of drying procedure. The advantage of hydrogen production form biomass gasification in supercritical water enjoys high-energy conversion and no pollution. The hydrogen production form biomass gasification in supercritical water has a widely uses in chemical industry, power and trafficc feilds. It is so attractive that many scholars have made a lot of researches in detail on it.Firstly, the energy and exergy of biomass gasification in supercritical is analysized based on actual methanol, glucose gasification reaction data. The quantityes effects of concentration, temperature, and heat pattern and heat exchange efficiency on energy and exergy of methanol, glucose gasification in SCW are discussed. Secondly, the energy conversion and exergy flow analysis of biomass gasification process in SCW is conducted, based on actual methanol combining complete gasification process with pressure swing adsorption process. The key factors and main parts of gasification process are revealed. Thirdly, primary factors are presented in the process of coal mixed carboxymethylcellulose (CMC) gasification reaction process by different feed concentration and exchange efficiency. Finally, primary analysis of the reaction pathways of the methanol gasification in SCW was conducted.An evaluation means of hydrogen production from biomass gasification in SCW is provided by gasification of model compounds of biomass. It is shown that temperature and concentration of the reactant mixture play an important role on the process of gasification of biomass in SCW for hydrogen production, that the greatest exergy loss is in heating up part, and that supercritical water gasification process has higher energy and exergy efficiency than conventinal gasification process. The supercritical water gasification process provides a high-efficient energy conversion and utilization method.