| The problem of energy and enviorment,has become the key question to restrict the development of the society.To develop the efficiential and enviormental technology of the new-energy had interested all countrys over the world.For the abundant reserves,in-pollute and inexpensive characters of biomass,it become the most important research in all.Besides,Hydrogen is a much important wealth,which can be used in the chemical and navigate field.It must be able to promote the development of the total society,economy and technology in using biomass product Hydrogen project.The article is based on the system of "One fluidied bed two-phase gasification". We do a series study on the biomass and coal' s co-gasification which include both the experimentation study and the simulation study.With the accomplishment of the test-bed project,we spent a lot of time and vigorness on the co-pyrolysisi study,the co-gasification examination and the simulation of itself.And the result is as follows:First,we do the study on the co-pyrolysis reactions of the biomass and coal blends.It turn up that during the course of the co-pyrolysis,the weightlessness peak value is declined to the lower temperature aera.The apparent activative energy of the blends is lower than that in each pyrolysis reaction themselves,which indicate that the coal and biomass have some mutual cooperative effect in the co-pyrolysis reactions.Second,we do the co-gasification test by the test bed which was designed by ourselves and was operated on biomass and coal at various Bed temperature,Biomass to steam ratio(S/B) and Biomass to coal ratio.And it turn out that the biomass and coal can have a good behavior in the fluidied state in the bed; The temperature and biomass to steam ratio is the most important factors in promoting the purity and the production of hydrogen,as well as the tar is under 10mg/m~3.When the temperature is about 1050～1000℃,S/B is to 2.07 and the biomass to steam ratio is to 4,one kilogram biomass can bring hydrogen 60.3g,and the hydrogen productive capability of the biomass is 116g.Finally,the developed two-phase air-steam gasification model was validated using the experimental results obtained from the test-bed by ASPEN PLUS software.A good agreement between the model predictions and experimental data was obtained under all operating conditions studied.Through the model sensitivity,it turn up that the higher temperature,the lower pressure,the bigger S/B value can do a favor to induce the production of the hydrogen.And the CaO can adjust the content of the gas.On a percentage increase basis(1%increase) of each of the operating variables,the Biomass to Steam ratio has the most effect on the hydrogen production followed by the temperature and then the CaO catalyzer and the pressure.Besides,on the condition of the CaO catalyzer,the rightest gasification temperature and S/B is declined.The CaO catalyzer can do a good job in the gasification reactions to bring much more pure hydrogen-rich gas.The study can be able to help the application the co-gasification of the biomass and coal blends in the near future. |
