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Research on Fuel Gas Production from Catalytic Gasification of Municipal Solid Wastes

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Tutor: LiJianFen
School: Wuhan Polytechnic University
Course: Biochemical Engineering
Keywords: Catalytic Gasification,Municipal solid waste,Gas,Nickel ferrite,Nickel-based cat
CLC: X799.3
Type: Master's thesis
Year:  2011
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Abstract:
With the acceleration of the process of socio-economic development and urbanization, the growth rate of the MSW and the number is constantly accelerating. Traditional garbage disposal technologies including landfill, composting, incineration, but these methods have certain drawbacks and secondary pollution problem. Garbage gasification technology has the advantages of low pollutant emission reductions significantly less capacitive and generate combustible gas, is considered to be the most promising alternative incineration technology has gradually become a new hotspot. Preparation of nickel ferrite composite crystal homogeneous precipitation explore the ratio of reactants, reaction temperature and time of calcination temperature and other factors on the preparation process, to determine the optimum conditions for the preparation of composite crystal; XRD, FTIR, SEM characterization methods to characterize the composite crystal. The analysis results show that the resulting product is NiFe 2 O 4 NiO composite nano-crystals, the crystallization is complete, uniform size, the case of the cubic spinel structure, with an average particle size of about 52nm. Explore the impact of various factors on product yield and the average particle size in the process of precipitation and calcination reaction experiments the optimum conditions for preparation of composite crystal: reactant nickel molysite proportion n (Ni) / n (Fe ) is 3:1, and the precipitation reaction temperature and time were 110 ¡æ and 2.0H, calcination temperature of 600 ¡ã C. Deposition precipitation method the reserve Ni-Fe/¦Ã-Al 2 O 3 , Ni-Co/¦Ã-Al 2 O Ni-Ce/¦Ã-Al 2 O 3 and other three kinds of nickel-based catalyst, the catalyst by means of XRD, FTIR, SEM characterization to characterize and city garbage catalytic gasification product gas tar cracking and reforming catalysts for testing and comparison of the catalytic properties of the catalyst. MSW pyrolysis gasification in a fixed bed reactor, using a home-made nickel-based catalyst, the effects of catalyst gasifier temperature, water vapor materials ratio (S / M), raw material particle size and other factors of production gas characteristics influence on the yield and composition of the generated gas was analyzed to determine the optimum conditions of the catalytic gasification. Experimental results show that, the main component of the resulting product gas of the garbage catalytic gasification H 2 , CO, CH 4 and CO 2 , etc., nickel The catalytic effect of the three kinds of nickel-based catalyst based catalyst can effectively promote the cracking of tar, improve the quality of gas, homemade: Ni-Fe/¦Ã-Al 2 O 3 > Ni-Ce/¦Ã-Al 2 O 3 > Ni-Co/¦Ã-Al 2 O 3 which Ni-Fe/¦Ã-Al 2 O 3 catalyst at 800 ¡æ tar removal efficiency of 99%, H 2 production highest rate can reach 56%; temperature are important factors to affect the gas yield and quality, the higher the temperature, the H 2 content and gas yield the higher; the introduction of water vapor can improve the quality and production of gas ratio, but the excess water vapor will reduce the vaporization temperature, thereby reducing the quality of the gas, the water vapor in the experimental conditions the material ratio (S / M) ratio is 1.33; raw material particle size is also affect the rate of gas production and the component The important factor smaller the particle size, the product gas quality and H 2 the higher the content. Catalytic pyrolysis and gasification of MSW, the steam reforming of enriched preliminary analysis and reaction mechanism of hydrogen gas.
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