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Method and device for gasifying multi-segment staged converted fluidized bed

A fluidized bed and coal gasification technology, applied in the field of coal gasification, can solve the problems of low volume utilization rate of the gasifier, high amount of fine powder entrained by the gas, and insufficient scale of the gasifier, so as to reduce coal grinding power consumption, The effect of a wide range of coal types and a simple structure

Active Publication Date: 2013-10-30
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, compared with the advanced gasification technology, there are still some problems: 1) The scale of the gasifier is still not large enough (the current industrial single furnace processing capacity is 300 tons of coal / day); The amount of fine powder is high, and the total carbon conversion rate is low (about 90%); 3) The volume utilization rate of the gasifier is low; 4) The centralized oxygen supply at the bottom is prone to local high temperature, resulting in poor fluidization and dead zones

Method used

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  • Method and device for gasifying multi-segment staged converted fluidized bed
  • Method and device for gasifying multi-segment staged converted fluidized bed
  • Method and device for gasifying multi-segment staged converted fluidized bed

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Embodiment 1

[0044] It consists of a fused ash separation unit, a pyrolysis gasification reactor, and a semi-coke fine powder circulation conveying unit. The fused ash separation unit consists of a cylindrical air chamber shell 1, a conical distribution plate 2, and a reducer 3. Central jet pipe 4, annular separation pipe 5, distributor connecting flange 6, heat insulation material 9, which is ash fall pipe 10, distribution plate gasification agent inlet pipe 11, central pipe gasification agent inlet pipe 12, annular separation pipe gas Chemical inlet pipe 13, slag outlet 14 constitutes. The conical distribution plate 2 is located on the upper part of the cylindrical air chamber shell 1, and is in the shape of an inverted cone. There are evenly distributed gas outlets 8 on the conical distribution plate 2; the lower part of the conical distribution plate 2 is connected with the reducer 3, and the lower part of the reducer 3 Connected with the annular separation pipe 5, there is a heat insu...

Embodiment 2

[0055] The opening ratio of the conical distribution plate is 1.5%, the aperture is Φ4mm, and the angle β between the conical generatrix and the central axis is 30°. The angle γ between the conical generatrix of the reducer and the central axis is 7°.

[0056] The crushed coal feed rate in the lower part of the fluidized bed is 2000kg / h, and the oxygen feed rate is 1000Nm 3 / h, the water vapor volume is 2000kg / h, the fine coal feed volume in the middle of the gasifier is 550kg / h, the gasifier pressure is controlled at 1.0MPa, and the circulating gas volume of the upper combustion nozzle is 180Nm 3 / h, oxygen content 90Nm 3 / h, steam rate 55kg / h, all the other are with embodiment 1.

Embodiment 3

[0057] Embodiment 3: The opening ratio of the conical distribution plate is 1.0%, the aperture is Φ4mm, and the angle β between the conical generatrix and the central axis is 40°. The angle γ between the conical generatrix of the reducer and the central axis is 7°.

[0058]The crushed coal intake in the lower part of the fluidized bed is 2500kg / h, and the oxygen intake is 1250Nm 3 / h, the water vapor volume is 2500kg / h, the fine coal feed volume in the middle of the gasifier is 650kg / h, the gasifier pressure is controlled at 1.5MPa, and the circulating gas volume of the upper combustion nozzle is 230Nm 3 / h, oxygen content 115Nm 3 / h, steam rate 70kg / h, all the other are with embodiment 1.

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Abstract

The invention relates to method and device for gasifying a multi-segment staged converted fluidized bed. The method comprises the following steps of: supplying coal; supplying gas; gasifying; slagging; and conveying fine powder. The device for gasifying the multi-grade staged converted fluidized bed comprises an agglomerating ash separating unit, a pyrolyzing and gasifying reactor of the multi-segment staged fluidized bed and a semicoke fine powder cyclic feeding unit. The invention has the advantages of high volume utilization rate of a gasifying oven, great handling capacity and high utilization rate of total carbon, is suitable for a coal staging and converting system and can be singly used for producing gas for mass coal-based methane synthesis and coal chemical industry.

Description

technical field [0001] The invention belongs to a method and device for coal gasification, in particular to a method and device for coal gasification in a multi-stage graded conversion fluidized bed integrated with pyrolysis, gasification and combustion. Background technique [0002] Coal gasification is one of the core technologies for high-efficiency and clean utilization of coal. It is the key to the development of process industries such as coal-based chemical production, coal-based liquid fuels, synthetic natural gas (SNG), IGCC power generation, hydrogen production, industrial gas and polygeneration systems. Base. my country is the largest coal gasification technology application market in the world, but most enterprises in our country are still using outdated atmospheric fixed-bed gasifiers, and the gasification capacity accounts for more than 70% of the total capacity. In recent years, with the rise of energy prices and the enhancement of environmental protection aw...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10J3/54C10J3/56C10J3/84C10J3/86C10J3/66
CPCY02E20/18Y02P20/129
Inventor 房倚天黄戒介程中虎赵建涛张永奇徐奕丰张尚武毛子刚胡震郭金霞
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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