Study On The Effect Of Metal Elements With Integrated Process For Hydrogen Production

Self-made integrated process for hydrogen production system can efficiently produce hydrogen-rich gas via thermal cracking,gas-solid simultaneously conversion and steam reforming.On this basis,the following three parts are studied:The influence of different metal elements on the integrated process system,the synergetic effect of K2CO3/CaO on hydrogen production and the catalytic activity of biochar on model biooil steaming reforming for hydrogen production.The effects of different metal K,Ca,Mg,Fe,Zn on hydrogen yield,gas composition and carbon conversion were studied based on integrated process for hydrogen production.The catalytic activities of different metal elements were found with the following sequence:K>Fe>Mg>Ca>Zn.Particularly,K shows the best catalytic effect with carbon conversion.Then,the effects of K on pyrolysis and gasification processes were discussed in detail.The results show that addition of K could catalyze the conversion of biomass pyrolysis and gas-solid simultaneous gasification.Potential hydrogen yield of 86.97g/kg biomass and carbon conversion of 90.11%were achieved under the pyrolysis temperature of 600? and gas-solid simultaneous gasification temperature of 850?.The effects of K2CO3 and CaO on the hydrogen production were studied.Increasing the contents of K2CO3 and CaO in the feed could improve the efficiency of hydrogen production.K2CO3 can help to improve the carbon conversion.CaO can significantly change the gas composition of pyrolysis and gasification and improve the hydrogen concentration.The results also indicate that the addition of K2CO3/CaO contributes to the maximum hydrogen production of 81.41g/kg biomass and the carbon conversion of 91.58%when the gas-solid simltaneously conversion reactor temperature is 850? in integrated process.Biochar derived from K2CO3 catalytic pyrolysis catalyze model Bio-oil for hydrogen production is studied.Higher temperature,the appropriate S/B and WHSV contribute hydrogen yield.maximum hydrogen yield of 84.05%was obtained at temperature of 900?,S/B of 3 and WHSV of 1h-1,which increase 11.99%of hydrogen yield compared to biochar derived from none catalytic pyrolysis(raw-char).