Downdraft gasifier with tar degradation function

Abstract

The invention discloses a downdraft gasifier with a tar degrading function. The downdraft gasifier comprises a hearth, wherein the lower part of the hearth is provided with a ring-shaped throat; a feeding hole is formed in the top of the hearth, and an ash outlet is formed in the bottom of the hearth; upper, middle and lower three-level tangential primary air distribution outlets are axially formed in the wall above the ring-shaped throat of the hearth; a tubular fire grate is arranged between the ring-shaped throat at the lower part of the hearth and the ash outlet at the bottom and is formed by hollow steel tubes spaced from each other; holes as secondary air distribution outlets are drilled in the hollow steel tubes; a vertical flue is arranged outside the hearth; one end of a horizontal flue flush with the tubular fire grate is communicated with the hearth and the other end is communicated with the vertical flue; a gas outlet is formed in the upper part of the vertical flue; a calcium base catalyst jet device is arranged at the top of the vertical flue. The downdraft gasifier has a simple structure, has a tar self-purifying capacity and can ensure that the tar in the gasified gases is fully decomposed before leaving the hearth, thus obtaining the gasified gases with relatively high quality.

Description

technical field [0001] The invention relates to a downdraft gasifier with the function of tar degradation, and belongs to the technical field of clean utilization of waste resources. Background technique [0002] At present, waste disposal is a major problem that needs to be solved urgently in today's society, and gasification technology is a clean and efficient method for waste disposal. Waste gasification is a method of pyrolysis and gasification of waste in a fixed gasifier and other devices in a high-temperature and low-oxygen environment to obtain combustible gases. Among many gasifiers, the fixed bed occupies an important position due to its simple structure, convenient operation, wide fuel adaptability and low investment. Traditional fixed bed gasifiers mainly include updraft fixed bed gasifiers and downdraft fixed bed gasifiers, but at present both gasifiers have serious problems, such as short residence time in the furnace , the tar content in the gasification gas...

AI Technical Summary

Problems solved by technology

Traditional fixed bed gasifiers mainly include updraft fixed bed gasifiers and downdraft fixed bed gasifiers, but at present both gasifiers have serious problems, such as short residence time in the furnace , the tar content in the gasification gas is relatively high, and it is easy to stick to the flue at the end of the furnace to form a blockage after the temperature drops, which is not conducive to the stable operation of the gasifier

Moreover, because the gasification gas contains tar, it increases the difficulty of the post-purification treatment of the gasification gas

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