Tar-free low-temperature gasification system and method

Abstract

The invention discloses a tar-free low-temperature gasification system and method. The tar-free low-temperature gasification system comprises a gasification device, a synthesis gas purification device, a gas holder and a hot flue gas generation device; and the gasification device comprises a gasification furnace and comprises a primary gasification area, a secondary gasification area and a gasification cooling area; a primary gasification agent distribution device is arranged at the bottom of the primary gasification area and used for spraying a first gasification agent, and hot flue gas which is generated by a hot flue gas generation device and has the temperature of 600-700 DEG C and the oxygen content of 8-15% is selected. The primary gasification area is further provided with a secondary gasification agent distribution device, and the secondary gasification area is provided with a tertiary gasification agent distribution device which is used for spraying a second gasification agent to form graded gasification. The second gasifying agent is high-temperature air and is obtained by heat exchange between air and high-temperature flue gas. The gasification process is precisely controlled by adopting temperature regulation and control T[actual]=[T[pre]-20 DEG C,T[pre]+20 DEG C] in the gasification furnace. The gasification system has the advantages that low-temperature gasification at the lower part can be realized, high-efficiency gasification is kept, and gasified gas is high in quality, free of tar and the like.

Description

technical field [0001] The invention relates to a tar-free low-temperature gasification system and method, in particular to a tar-free gasification system and a gasification method suitable for domestic garbage and hazardous waste, and belongs to the field of gasification. Background technique [0002] The composition of domestic waste is often complex and changeable, and there are large differences due to factors such as urban development level and residents' living habits. China's domestic waste includes kitchen waste, plastic, paper, glass, etc., and usually because of its high moisture content, it affects its combustion stability in the incinerator, causing problems such as insufficient combustion or deflagration, and the water evaporates to smoke The high moisture content of the flue gas in the gas will easily cause corrosion of the heating surface and subsequent equipment. Gasification can effectively avoid these problems, and can also obtain synthesis gas. However, s...

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Problems solved by technology

Traditional fluidized bed and entrained bed gasifiers have high reaction rate and conversion efficiency, but there are problems with high tar and dust content, which not only reduces the quality of syngas, but also causes problems including blockage of pipelines, corrosion of heating surfaces or ash Equipment failure such as adhesion

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