Large downdraft static bed biomass gasifier

Abstract

The invention discloses a large downdraft static bed biomass gasifier. The diameter of the biomass gasifier is 5-7 m, and heat output is 6000-10000 kw. The biomass gasifier comprises a feeder, an upper gasifier body and a lower gasifier body, a poking mechanism is arranged at the upper end of the upper gasifier body and connected with the feeder, a gasifier body outer cylinder is arranged between the upper gasifier body and the lower gasifier body, and a gasifier body inner container is installed in the gasifier body outer cylinder; a fire grate support is arranged at the upper end of the lower gasifier body and is connected with a fire grate rotating device arranged at one side of the gasifier body outer cylinder; a charcoal outlet spiral pipe is connected with the bottom end of the lower gasifier body, and a rotating valve is arranged at one end of the charcoal outlet spiral pipe; a fuel gas branch pipe is arranged at the bottom end of the upper gasifier body. According to the large downdraft static bed biomass gasifier, the heat-resistant steel water-cooling fire grate support shaped like the Chinese character 'mi' is used for replacing a cross-shaped nodular cast iron structure, it is ensured that raw materials in the gasifier are uniform as the poking device is used, and by adopting the mode that multiple fuel gas branch pipes are gathered into two sides of a header pipe to be led out, the fuel gas bias flow in the gasifier is prevented.

Description

technical field [0001] The invention relates to the technical field of gasifier application, in particular to a large downdraft fixed bed biomass gasifier. Background technique [0002] Using biomass such as agricultural and forestry wastes with low calorific value, through thermophysical changes and chemical reactions in the gasifier, combustible gases such as carbon monoxide, hydrogen and methane are generated for combustion in biomass gas-fired boilers to produce steam for power generation, power supply Heat, or as a raw material gas for chemical synthesis, is in line with my country's energy and environmental protection policies. [0003] At present, the industrialized biomass gasifiers on the market mainly include downdraft fixed bed gasifiers, updraft fixed bed gasifiers and fluidized bed gasifiers. Downdraft fixed bed gasifiers were the first to be recognized and applied by the market due to their advantages of simple operation and low tar content. Factors that limit...

AI Technical Summary

Problems solved by technology

The downdraft fixed-bed gasifier was first recognized and applied by the market due to its advantages of simple operation and low tar content. Factors limit the capacity of the downdraft fixed-bed gasifier. The diameter of the gasifier is generally less than 3 meters, and the heat load output is less than 5000kw, which is less than 1000kw for internal combustion engine power generation.

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