Multilayer fluidized bed gasification furnace

Abstract

The invention discloses a multilayer fluidized bed gasification furnace, the 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 divide 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. The shortest distance between the upper end of the first overflow device as well as the second overflow device and the inner wall of the gasification furnace is between 1 / 5 times and 1 / 2 times of the internal diameter of the gasification furnace shell.

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 disadvantages of this type of coal gasification process are: the gasification reaction consumes a lot of energy, requires high equipment, and requires three reaction devices, and the process is more complicated, etc.

The device prolongs the residence time of pulverized coal, which is beneficial to solid-phase processing and has a high heat energy utilization rate, but the reaction volume utilization rate in the gasifier is low, which affects solid-phase processing; when the vertical furnace is operated, the carbon content in the residue is high, Difficult to use effectively; 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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