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Method and device for coal gasification in combined type fluidized bed

A fluidized bed gasification, fluidized bed technology, applied in the field of coal gasification, can solve the problems of fluidized bed carbon utilization rate decline, low carbon conversion rate, short reaction time, etc., to improve gasification efficiency and processing capacity, The effect of low carbon content in ash discharge and simple operation

Active Publication Date: 2014-02-19
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Since the operating temperature of the fluidized bed gasifier is about 1000°C, under this temperature condition, the coal coke needs to have a residence time of 20-30 minutes to be completely converted, but the fine particles (<0.1mm, accounting for 10% of the total coal input) % or so) in the gasifier is usually within ten to tens of seconds for a residence time, although the fine powder circulation is increased, the total reaction time is short and the carbon conversion rate is low
This part of the unconverted fine powder is taken out of the system, resulting in a decrease in the carbon utilization rate of the fluidized bed

Method used

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  • Method and device for coal gasification in combined type fluidized bed
  • Method and device for coal gasification in combined type fluidized bed

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Experimental program
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Embodiment 1

[0046] The composite fluidized bed gasification device is composed of a composite fluidized bed coal gasification furnace and a semi-coke fine powder circulation device. The composite fluidized bed coal gasification furnace is composed of a fluidized bed and an entrained flow bed. The bed is composed of a fluidized bed furnace body, a gasifier gas outlet pipe 15, a gas distributor 1 and an annular separation ash fall pipe 5, and the fluidized bed furnace body is made of a steel furnace shell 7, refractory material 8 and thermal insulation material 9 , the insulation material 9 is located between the steel furnace shell 7 and the refractory material 8, the top of the fluidized bed furnace body has a gasifier gas outlet 15 and furnace top quenching water pipe 14, and the lower part of the fluidized bed furnace body has a coal feed pipe 10 , the bottom of the fluidized bed furnace body is connected to a gas distributor 1, the gas distributor 1 has a central tube gasification agent...

Embodiment 2

[0053] The fluidized bed coal feed rate is 2300kg / h, and the oxygen feed rate is 1100Nm 3 / h, the water vapor volume is 2000kg / h, the fine powder feed volume of the entrained bed is 400kg / h, and the ratio of oxygen to dry coal powder is 0.53Nm 3 / kg, steam-coal ratio 0.16kg / kg, the pressure of the gasifier is controlled at 1.0MPa, the temperature at the bottom of the fluidized bed gasifier is stable at 980°C, the operating temperature of the entrained bed part is at 1250°C, the fluidized bed and entrained bed The junction temperature is 1100°C. All the other are with embodiment 1.

Embodiment 3

[0055] The fluidized bed coal feed rate is 2800kg / h, and the oxygen feed rate is 1380Nm 3 / h, the water vapor volume is 2700kg / h, the fine powder feed volume of the entrained bed is 600kg / h, and the ratio of oxygen to dry coal powder is 0.55Nm 3 / kg, steam-coal ratio 0.16kg / kg, the pressure of the gasifier is controlled at 1.5MPa, the temperature at the bottom of the fluidized bed gasifier is stable at 1000°C, the operating temperature of the entrained bed part is at 1200°C, the fluidized bed and entrained bed The junction temperature is 1090°C. All the other are with embodiment 1.

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Abstract

The invention discloses a method for coal gasification in a combined type fluidized bed, which comprises coal preparation, gas supply, gasification, slag discharge, dedusting, waste heat recovery and fine powder conveying. An ash agglomeration fluidized bed realizes gasification of large-particle coal; the non-completely converted carryover fine powder enters an entrained flow bed gasifier in a dense phase pneumatic conveying manner; secondary gasification is carried out by using a short retention time high temperature gasification manner; the produced ash slag is carried into an intersection segment of the fluidized bed and the entrained flow bed with high temperature coal gas, and rapidly mixed with ''low temperature'' large-particle partially carbonized coal in the fluidized bed and the produced ''low temperature'' coal gas; and partial ash slag is selectively discharged out of the gasifier in the form of solid. The method and the device of the invention have the advantage of being suitable for various coal types and high in carbon conversion rate.

Description

[0001] Field [0002] The invention belongs to a coal gasification method and device, in particular to a high-efficiency fluidized bed coal gasification method and device that adopt a fluidized bed and an entrained flow bed composite integration. Background technique [0003] Coal gasification is one of the core technologies for efficient and clean utilization of coal, and is the basis for the development of process industries such as coal-based chemicals, coal-based clean fuels, industrial gas and polygeneration systems. [0004] Judging from the current development trend of coal gasification technology at home and abroad, large-scale, pressurized, adaptable to various pulverized coal, low pollution, and easy purification are the development directions of coal gasification. The existing foreign pressurized gasifiers are mainly divided into three categories: pressurized fixed-bed gasifiers (such as Lurgi furnaces), pressurized fluidized-bed gasifiers (HTW) and pressurized entr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10J3/56
CPCY02P20/129
Inventor 房倚天黄戒介程中虎王志宇徐奕丰毛子刚郭金霞张尚武张永奇赵建涛李庆丰杨金权
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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