Method for gasifying pulverized coal step by step in double beds connected in series

Abstract

The invention discloses a step-by-step gasification method of pulverized coal with double beds in series, which adopts the form of circulating fluidized bed gasification furnace in series with entrained flow bed gasification furnace. The core of the invention is to use oxygen in the entrained bed to perform secondary gasification on the high-temperature dust-containing gas produced by the gasification of the circulating fluidized bed. The present invention takes circulating fluidized bed gasification as the main body, and coal gasification is mainly completed in the circulating fluidized bed. By virtue of the advantages of circulating fluidized bed gasification, the coal type adaptability of the gasification device is expanded, and the single set of gasification device is improved. production capacity. Supplemented by entrained bed gasification, with the help of its high reaction temperature and the characteristics of crude gas needing to be washed by chilled water, it solves the problems of low carbon conversion rate, low content of effective gas in syngas and coarse gas produced in circulating fluidized bed gasification. There are a series of problems such as high ash content and pyrolysis products.

Description

technical field

[0001] The invention relates to the field of coal gasification, in particular to the field of lignite gasification, in particular to a step-by-step gasification technology of pulverized coal in series with two beds. Background technique

[0002] Coal gasification is the most promising technology in the clean utilization of coal resources. Entrained bed gasification technology and circulating fluidized bed gasification technology are the two most widely used technologies in the new coal gasification technology.

[0003] The entrained gasification reaction temperature is high, the carbon conversion rate is high, the coal pyrolysis product content in the obtained crude gas is small, the crude gas purification process is convenient, and the technical cleanliness is high, but the entrained bed has high requirements for coal types and poor adaptability to coal types .

[0004] Circulating fluidized bed gasification can utilize lignite and bituminous coal with low...

Examples

Embodiment Construction

[0024] Such as figure 1 As shown, the circulating fluidized bed (1) is composed of a gasifier body (2), a gasification agent inlet (3), a pulverized coal inlet (4), an air distribution device (5), and a return cyclone separator (6). The gasifier body (2) is lined with refractory materials, the gasification agent inlet (3) is located at the lower part of the gasifier body (2), and the pulverized coal inlet (4) is located at the upper part of the gasification agent inlet (3). The gasifier body (2) is lined with a refractory material, and four gasification agent inlets are arranged around the gasifier at an angle of 90°.

[0025] The entrained bed (7) gasifier includes two parts, a combustion section (8) and a quenching section (12). The combustion section is composed of the gasifier hearth (9), the dusty gas inlet (10), and the oxygen nozzle (11), and the quenching section is composed of the gasifier shell (13), the quenching water inlet (14), the quenching water distributor (...

technical field

[0001] The invention relates to the field of coal gasification, in particular to the field of lignite gasification, in particular to a step-by-step gasification technology of pulverized coal in series with two beds. Background technique

[0002] Coal gasification is the most promising technology in the clean utilization of coal resources. Entrained bed gasification technology and circulating fluidized bed gasification technology are the two most widely used technologies in the new coal gasification technology.

[0003] The entrained gasification reaction temperature is high, the carbon conversion rate is high, the coal pyrolysis product content in the obtained crude gas is small, the crude gas purification process is convenient, and the technical cleanliness is high, but the entrained bed has high requirements for coal types and poor adaptability to coal types .

[0004] Circulating fluidized bed gasification can utilize lignite and bituminous coal with low...

Examples

Embodiment Construction

[0024] Such as figure 1 As shown, the circulating fluidized bed (1) is composed of a gasifier body (2), a gasification agent inlet (3), a pulverized coal inlet (4), an air distribution device (5), and a return cyclone separator (6). The gasifier body (2) is lined with refractory materials, the gasification agent inlet (3) is located at the lower part of the gasifier body (2), and the pulverized coal inlet (4) is located at the upper part of the gasification agent inlet (3). The gasifier body (2) is lined with a refractory material, and four gasification agent inlets are arranged around the gasifier at an angle of 90°.

[0025] The entrained bed (7) gasifier includes two parts, a combustion section (8) and a quenching section (12). The combustion section is composed of the gasifier hearth (9), the dusty gas inlet (10), and the oxygen nozzle (11), and the quenching section is composed of the gasifier shell (13), the quenching water inlet (14), the quenching water distributor (...

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