Design Of Biomass Fluidized Bed Gasification Testing System To Hydrogen-rich Gas Yield And Results Of Experiments

Hydrogen is recognized as the ideal energy in the 21^st century.Hydrogen production from biomass thermo-chemical conversion is considered the most economic and technical vitality.Jiangsu University advanced the biomass and coal co-gasification technology to produce hydrogen based on the original study.This technology has the following characteristics:First,A small amount of coal can used as inert particles can improve the flow performance of biomass.The coal is the body of heat,this can increase the temperature and accelerate the decomposition of tar into a non-condensable gas and resolve tar problems.Second,the biomass and coal co-gasification technology is not only suitable of our country rich coal and poor oil and gas energy structure,but also can maintain long-term sustainable use of coal as well as beneficial to the environment,so that our country can have a more rational use of energy resources.Third,Biomass gasification process was divided into combustion and gasification process by a single fluidized bed,this make the CaO catalyst recycle and can reduce gasification temperature and promote the complete conversion of carbon and the efficiency of biomass gasification and hydrogen production rate were further improved.Fourth,renewable energy was adopted to produce hydrogen-rich gas,it can help to reduce the investment and greenhouse effect and use of agricultural and forestry waste.According to the technology of Jiangsu University,the process of testing system was established.The process use steam as gasifying agent and biomass combustion and gasification stage were arranged in the same gasifier in use of four valves.The various equipment were designed in accordance with the process and the testing system was setted up successfully.The testing system was debugged overall based on the equipment were debugged separately and a various of experiments were conducted.The experiments of biomass and coal co-gasification were conducted first, then the CaO catalyst was introduced into experiments and results were compared. The following conclusions were drawed from the experiments:First,the hydrogen yield influence order during the three parameters is steam to biomass ratio(S/B)＞reactor temperature＞biomass to CaO ratio.Second,hydrogen concentration increased from 36.82 to 42.66%(vol) and hydrogen yield and hydrogen yield potential each increased from 32.88 to 53.33g H₂/Kg daf biomass and 90.33 to 118.07 g H₂/Kg daf biomass when reactor temperature was increased from 900～950℃to 1000～1050℃.Third,hydrogen concentration increased from 36.63(S/B=1.15)to 48.25%(vol)(S/B=2.07) and hydrogen yield and hydrogen yield potential each increased from 29.44 to 60.32g H₂/Kg daf biomass and 82.15 to 116.43g H₂/Kg daf biomass when steam to biomass ratio(S/B) was increased from 1.15 to 2.07.Fourth, hydrogen concentration increased from 42.53 to 47.28%(vol) and hydrogen yield and hydrogen yield potential each increased from 37.98 to 59.10g H₂/Kg daf biomass and 77.79 to 127.88 g H₂/Kg daf biomass when biomass to coal ratio(S/B) was increased from 0/100 to 100/0.Fifth,CaO catalyst can improve hydrogen yield and hydrogen yield potential,so this is the better way of hydrogen-rich gas production from biomass gasification and is the direction of biomass gasification.