Multilayer fluidized bed gasification furnace for preparing methane-rich gas by coal gasification

Abstract

The invention discloses a multilayer fluidized bed gasification furnace for preparing a methane-rich gas by coal gasification. The multilayer fluidized bed gasification furnace comprises a gasification furnace shell, at least two layers of gas distributors, a raw material inlet, a clinker outlet, a gasification agent inlet, a coal gas outlet, a first overflow device and a second overflow device, wherein the gas distributors are perpendicular to a longitudinal axis and arranged at different heights along the longitudinal axis in a perforated plate form to partition the internal space into an upper space, a middle space and a lower space; the clinker outlet and the gasification agent inlet are positioned at the bottom of the shell; the coal gas outlet is positioned on the top of the shell; and the first overflow device and the second overflow device are penetrated into the first gas distributor and the second gas distributor respectively and each of the first overflow device and the second overflow device is tubular, and has two open ends, so that a raw material flows from the upper space to the middle space through the first overflow device along a curved line and then flows to the lower space from the middle layer through the second overflow device.

Description

technical field [0001] In general, the present invention relates to a gasification furnace, and in particular, the present invention relates to a multilayer fluidized bed gasification furnace for preparing methane-rich gas from coal gasification. Background technique [0002] The invention relates to a multilayer fluidized bed gasification furnace device for producing gas rich in methane by gasifying pulverized coal in a multilayer fluidized bed. [0003] my country is a country rich in coal, poor in oil and little in gas. With the rapid development of society and economy, the demand for natural gas in my country has risen sharply, and its proportion in the energy structure has increased rapidly. However, domestic natural gas is still in the early stages of exploration and development, imports are also in the initial stage, and the supply capacity is seriously lagging behind, resulting in increasingly prominent contradictions between natural gas supply and demand. Utilizing...

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Problems solved by technology

The device prolongs the residence time of pulverized coal, which is beneficial to solid-phase processing and has a high utilization rate of heat energy, but the reaction volume utilization rate in the gasifier is low, which affects solid-phase processing; the carbon content in the residue is high during vertical furnace operation, which is difficult Effective utilization; compared with gas-solid contact heat transfer, the heat transfer rate is slow, and the solid phase in the bed is heated unevenly; at the same time, the equipment is complicated, especially the horizontal furnace

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