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Abstract. The pyrolysis gasification treatment in the paper is the new direction of municipal solid waste disposal by comparing waste incineration, composting and sanitary landfill treatment technology. The principle and classification of pyrolysis gasification technology are described in detail. The research status of three typical commercial waste disposal devices and pyrolysis gasification of domestic waste are introduced. The pyrolysis gasification temperature of waste is suitable between 700~900 ℃, the increase of gasification temperature can increase the yield and low calorific value of synthesis gas. Adding proper amount of water vapor to the gasification medium facilitates the cracking of the tar and improves the H2 content in the synthesis gas.

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Abstract.In this paper the path of tar formation during biomass pyrolysis or gasification is described. When the reaction temperature is in the range of 800-900℃, the tar yield is between 2.5% -5%. Meantime, the primary tar approaches 0, the secondary tar content is 40-60%, the tertiary tar content is 20-60%; furthermore, the catalytic cracking of tar and calcined dolomite have some catalytic cracking ability to tar, and the disadvantages of mechanical strength and low anti-wear performance are poor; Nickel-based catalyst has high catalytic activity for tar and the tar removal rate is as high as 99%. A variety of alkali carbonate mixture of tar on the catalytic activity better than a single effect. In the actual application process, the choice of tar cracking catalyst depends on the pyrolysis or gasification of raw materials, treatment processes, reaction temperature and other factors considered.

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