Fixed bed gasifier, production system and production method thereof

Abstract

The invention provides a fixed bed gasifier, a production system and a production method thereof, and relates to the technical field of coal gas manufacturing equipment. The fixed bed gasifier provided by the invention comprises a furnace body with a feed inlet, a feeding mechanism connected with the furnace body, a fire grate mechanism horizontally and rotatably arranged in the furnace body and a transmission device for driving the fire grate mechanism to rotate. The gasifier has the advantages of efficient and energy-saving structure, convenient transportation and installation, reasonable height-diameter ratio, helps to increase the height of a material layer, not only reduces the sensible heat loss, but also improves the steam taste. The invention further provides a production system which comprises the fixed bed gasifier and other auxiliary purification equipment. The discharge amount of dust, suspended solids and steam in the coal gas is reduced, so that the temperature of a coal gas outlet is very low, and the subsequent coal gas treatment pressure is reduced. The invention also provides a production method for producing coal gas by using the production system, so that the effective gas in the coal gas can reach more than 90%, the steam decomposition rate reaches more than 85%, the residual carbon content is about 2%, and the gasification intensity reaches more than 2000m <3> / m<2>.h.

Description

technical field [0001] The invention relates to the technical field of gas manufacturing equipment, in particular to a fixed-bed gasifier, a production system and a production method thereof. Background technique [0002] At present, the ideal slag gasifier for fixed-bed coal gasification is a single-stage coal gasifier, which uses a staged gas production mode of high-temperature slag, liquid slag quenching, and solid slag discharge. The effective gas composition can reach more than 92%. The gasification agent is distributed by a spray gun (abandoning the traditional grate), and the slag discharge adopts the liquid slag height pressure difference intermittent discharge; due to the uneven distribution of the gasification agent, the resistance of the material layer is in the material layer When the height changes, the difference is very large, the radial gasification of the fire layer is uneven and the co-solvent is increased; the temperature of the liquid slag is difficult to...

AI Technical Summary

Problems solved by technology

The effective gas composition can reach more than 92%. The gasification agent is distributed by a spray gun (abandoning the traditional grate), and the slag discharge adopts the liquid slag height pressure difference intermittent discharge; due to the uneven distribution of the gasification agent, the resistance of the material layer is in the material layer When the height changes, the difference is very large, the radial gasification of the fire layer is uneven and the co-solvent is increased; the temperature of the liquid slag is difficult to reach the ideal control range, the operation control is difficult, it cannot run at high load, and the operation is unstable, and it is easy to wear the furnace and The slag discharge is not smooth, and the pressure supporting burner at the slag discharge port burns continuously, a large amount of gas is wasted, and the water consumption of quenching liquid slag is large, and the treatment volume of sulfur-containing sewage is large; in addition, the single-stage coal gasifier is only suitable for low ash melting point Raw materials, the scope of application of raw materials is limited

[0003] Low temperature fixed bed pure oxygen continuous gasifier, the effective gas can reach more than 80%, the steam decomposition rate can reach more than 65%, the residual carbon is about 2%, and the gasification intensity is only 1300m 3 / ㎡.h; the temperature of the gasification layer is low, it can only operate below the ash melting point, the load is small, the steam decomposition rate is low, the sewage treatment capacity is large, the operation is uneconomical, the cost is high, and the environmental protection pressure is high; solid slag discharge, material layer It is relatively short, the gas outlet temperature is as high as 500°C, there are many substances carried out, and the environmental pollution is serious. It is not suitable for coal gasification production and has been difficult to promote in the coal gasification industry so far.

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