Experimental Study On Hydrogen Production From Municipal Solid Waste By Catalytic Pyrolysis

With economic development and the fast process of urbanization, the total of municipal solid waste(MSW) rapidly increasing which pose a great threat to the environment. It is proved that the pyrolysis technology is one of the most important MSW disposal ethnics with little secondary pollution, quite innocuity and high reusability. At the same time refuse contains large numbers of hydrogen resources which makes the possibility of hydrogen production. In order to enhance production of the gas and gaseous hydrogen production rate, my dissertation is on the basis of using catalysts to further reform the pyrolysis product to realize the purpose of reusing the resources & economic cycle.To simulate the pyrolysis characteristics of industrial facility, an externally heated catalytic pyrosis furnace was built. Experiments were carried out using MSW as the testing materials. Mainly do the study on the dolomite, nickel-based, rare earth these three types of catalyst to study the gas properties & hydrogen production. Under each catalyst condition, the influences of main parameters such as pyrolysis temperature (750℃～900℃), the feed speed of spiral feeder (25 r/min to～40 r/min), the proportion of catalyst powder mixed materials (0～10%) were experimentally investigated.The results showed that adding the catalyst can significantly increase the gas production and gaseous hydrogen production rate, the best parameters for hydrogen production of each catalyst are also given: Dolomite as a catalyst, the best parameters for hydrogen production are: Pyrolysis temperature is 900℃, Speed is 30r/min, Dolomite powder by 10% proportion of materials, H2 production rate is 40.9% and the gas production is 0.89L/g under that condition; Nano-NiO /γ-Al2O3 as a catalyst, the best parameters for hydrogen production are: Pyrolysis temperature is 900℃, Speed is 30r/min, Nano- NiO powder by 5% proportion of materials, H2 production rate is 56.8% and the gas production is 1.25L/g under that condition;Nano- NiO / red mud as a catalyst, the best parameters for hydrogen production are: Pyrolysis temperature is 900℃, Speed is 30r/min,Nano- NiO powder by 5% proportion of materials, H2 production rate is 44.6% and the gas production is 1.12L/g under that condition;Rare-earth as a catalyst, the best parameters for hydrogen production are: Pyrolysis temperature is 750℃, Speed is 30r/min, catalyst powder by 5% proportion of materials, H2 production rate is 31.4% and the gas production is 0.85L/g under that condition.In 800℃,rare-earth catalyst had signs of inactivation. For other catalysts, under the same experimental conditions, relative to the non-use of catalyst, the rank of increasing for gas production and hydrogen production rate is: Nano NiO /γ-Al2O3> Nano NiO / red mud> dolomite.under the experimental conditions, the catalyst for all kinds of tar removal followed by: nano-NiO /γ-Al2O3> rare-earth > nano-NiO / red mud> dolomite, the catalyst for all kinds of catalytic cracking effects for semi-coke followed by: nano-NiO /γ-Al2O3> nano-NiO / red mud> rare-earth > dolomite.