Equipment and technology for producing synthesis gas through cooperating outer cylinder air gasification with inner cylinder steam gasification

Abstract

The invention belongs to the technical field of biomass thermal transition, and particularly relates to equipment and a technology for producing synthesis gas through cooperating outer cylinder air gasification with inner cylinder steam gasification. The equipment comprises a refining device (1), a feed port (2), an observation port (3), an outer cylinder (4), an outer cylinder inner heat preservation (5), an inner cylinder (6), a steam distribution device (7), an air distribution port (8), a carbon discharge device (9), an inner cylinder induced draft fan (10), a temperature measuring device (11), an outer cylinder induced draft fan (12), an ash discharge device (13), an ash removal tower (14), an exhaust-heat boiler (15) and a carbon dioxide absorption tower (16). According to the equipment and the technology, the cooperation between the outer cylinder air gasification and the inner cylinder steam gasification is adopted for achieving energy self-sufficiency, and inner cylinder high-temperature self-catalysis reforming and steam gasification are adopted for producing the synthesis gas with hydrogen and carbon monoxide content of 85-90%.

Description

technical field [0001] The invention belongs to the technical field of thermal transformation of biomass, and in particular relates to a device and a process for synthesizing gas by air gasification in an outer cylinder and water vapor gasification in an inner cylinder. Background technique [0002] At present, the main equipment of biomass gasification technology includes fixed bed gasifier and fluidized bed gasifier. The fixed bed gasifier mainly uses air gasification, and the tar produced in the gasification process is difficult to remove, and the syngas contains Nearly 50% nitrogen leads to a low calorific value of the gas. The fluidized bed gasifier is generally based on air gasification, but there is also the problem of high tar content in the synthesis gas, which brings difficulties to the transportation and use of the synthesis gas. Obstacles, there are very few twin-bed gasification, the use of inert media for heat transfer, steam gasification, can increase the calo...

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Problems solved by technology

[0002] At present, the main equipment of biomass gasification technology includes fixed bed gasifier and fluidized bed gasifier. The fixed bed gasifier mainly uses air gasification, and the tar produced in the gasification process is difficult to remove, and the syngas contains Nearly 50% nitrogen leads to a low calorific value of the gas. The fluidized bed gasifier is generally based on air gasification, but there is also the problem of high tar content in the synthesis gas, which brings difficulties to the transportation and use of the synthesis gas. There are very few twin-bed gasification, using inert medium for heat transfer, and steam gasification, which can increase the calorific value of the synthesis gas, but due to the short residence time of the material, the tar content is still high

The gasifiers currently on the market have exposed many problems during the pilot test and engineering process, which have hindered the promotion of biomass gasification technology and the process of industrial production. The most fatal problems are two: 1. The removal of tar in syngas is the biggest bottleneck of biomass gasification technology. At present, tar removal in industrial equipment uses a combination of physical and mechanical methods to purify syngas by spraying, water bath, condensation, separation and other equipment. Traditional this This method can only remove part of the tar in the combustible gas, and a considerable part of the tar remains in the synthesis gas. The biggest problem with this method is that a large amount of water is wasted, and a large amount of tar black water pollution is easily generated; the second is biomass synthesis gas Among them, the nitrogen content is relatively high, accounting for nearly 50%, resulting in a low calorific value of the syngas

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