Fire grate and fixed bed gasifier

Abstract

The invention provides a fire grate and a fixed bed gasifier, and relates to the technical field of coal gas manufacturing equipment. The invention provides a fire grate which comprises a fire grate body with the section of a parabola structure, a first ash pushing rib and a second ash pushing rib which are distributed in a staggered mode are arranged on the side wall, making contact with materials, of the upper portion of the fire grate body, and the extending direction of the first ash pushing rib and the extending direction of the second ash pushing rib are arranged in an involute mode. A cooling cavity is formed in the fire grate piece, the stirring column, the first ash pushing rib and the second ash pushing rib are cooled in a water cooling mode, and the stress and the strength of the stirring column, the first ash pushing rib and the second ash pushing rib are ensured. According to the fire grate, the distribution of the gasifying agent in each area can be adjusted according to the resistance difference of radial material layers formed by different raw material varieties in the furnace, so that the gasification of the gasification furnace is uniform and runs at high load. The invention further provides the fixed bed gasifier which comprises the fire grate and a gasifier body, the fire grate is rotationally installed in the gasifier body, and the fixed bed gasifier has the advantages of being simple in structure, efficient, capable of saving energy, reasonable in height-diameter ratio, high in gasification strength, high in steam decomposition rate, good in gas quality and low in carbon residue.

Description

technical field [0001] The invention relates to the technical field of gas manufacturing equipment, in particular to a grate and a fixed-bed gasifier. Background technique [0002] The existing slag gasifier adopts the staged gas production mode of high-temperature slag, liquid slag quenching, and solid slag discharge. The gasification agent is distributed by a spray gun without a grate; the intermittent automatic slag discharge is carried out through the liquid slag level pressure of the slag pool. This slag discharge method makes the liquid slag liquid level unstable and the material layer unstable, and the resistance of the material layer varies greatly when the height of the material layer changes, the radial gasification of the fire layer is uneven, the liquid slag temperature fluctuates greatly, and the operation Difficult to control. And it needs to increase the co-solvent, which has high requirements on the stability of raw materials and is only suitable for raw ma...

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Problems solved by technology

However, the existing fixed bed gasification is at low temperature, and the fixed bed intermittent furnace has been eliminated due to the large water and gas pollution; the pure oxygen continuous gasification furnace has an effective gas of more than 80% and a steam decomposition rate of more than 65%. The residual carbon is about 2%, and the gasification intensity is only 1300m3 / ㎡.h; but the temperature of the gasification layer is low, and it can only be operated below the ash melting point. The load is small, the steam decomposition rate is low, the sewage treatment capacity is large, and the operation is uneconomical. High cost and great pressure on environmental protection; it is not applicable to the current coal gasification production and cannot be promoted in the coal gasification industry so far

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