Method for preparing fuel gas by fluidized bed co-gasification of biomass and coal

A biomass and fuel gas technology, applied in the direction of granular/powdered fuel gasification, etc., can solve problems such as inability to stabilize fluidization alone, low energy density of biomass, and inability to supply stably, achieving high production efficiency, wide distribution, The effect of convenient processing

Active Publication Date: 2006-11-22
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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Problems solved by technology

Biomass fluidized bed gasification technology is an important way to effectively utilize biomass energy. Biomass has high content of volatile components, high carbon reactivity, low content of sulfur, nitrogen and ash, and is more suitable as gasification raw material; There are some disadvantages in separate gasification of materials. First, biomass production is seasonal and cannot be supplied stably. Second, due to the irregularity of biomass particles, it cannot be fluidized independently in a fluidized bed, and bed materials need to be added, such as Sand, which increases power consumption; third, the low energy density of biomass leads to low gasification temperature, generally between 600 and 800°C, so a large amount of tar will be produced, which will be deposited in or even block the pipeline or post-system equipment. Improper treatment of discharged tar can easily cause secondary pollution

Method used

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  • Method for preparing fuel gas by fluidized bed co-gasification of biomass and coal

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Effect test

Embodiment 1

[0018] The mixture of rice straw and coal is used as raw material for gasification. The rice straw does not need to be sorted and purified. It is crushed to a particle size of less than 5mm and mixed with coal particles with a particle size of less than 2mm. The mass percentage of straw in the mixture is 5%. The material is added to the silo 1 with a stirring device for use. Insert the flame spray gun into the furnace from the bottom of the gasification furnace 10, feed in the liquefied gas and the air required for complete combustion, heat the gasification furnace 10 to 700-800°C, stop heating, turn on the speed regulating motor 3, and feed through the screw The device 4 puts the mixed materials into the gasifier 10, and the compressed air generated by the air compressor 7 enters the gasifier 10 through the distribution plate 11 and the central pipe 12 respectively, and the total amount of air entering the furnace is equal to the mixture raw material of biomass and coal. Th...

Embodiment 2

[0024] The mixture of rice straw and coal is used as raw material for gasification. The rice straw does not need to be sorted and purified. It is crushed to a particle size of less than 5mm and mixed with coal particles with a particle size of less than 2mm. The mass percentage of rice straw in the mixture is 33%. The material is added to the silo 1 with a stirring device for use. Insert the flame spray gun into the furnace from the bottom of the gasification furnace 10, feed in the liquefied gas and the air required for complete combustion, heat the gasification furnace 10 to 700-800°C, stop heating, turn on the speed regulating motor 3, and feed through the screw The device 4 puts the mixed materials into the gasifier 10, and the compressed air generated by the air compressor 7 enters the gasifier 10 through the distribution plate 11 and the central pipe 12 respectively, and the total amount of air entering the furnace is equal to the mixture raw material of biomass and coal....

Embodiment 3

[0030] The mixture of rice straw and coal is used as the raw material for gasification. The rice straw does not need to be sorted and purified. It is crushed to a particle size of less than 5mm and mixed with coal particles with a particle size of less than 2mm. The mass percentage of rice straw in the mixture is 50%. The material is added to the silo 1 with a stirring device for use. Insert the flame spray gun into the furnace from the bottom of the gasification furnace 10, feed in the liquefied gas and the air required for complete combustion, heat the gasification furnace 10 to 700-800°C, stop heating, turn on the speed regulating motor 3, and feed through the screw The device 4 puts the mixed materials into the gasifier 10, and the compressed air generated by the air compressor 7 enters the gasifier 10 through the distribution plate 11 and the central pipe 12 respectively, and the total amount of air entering the furnace is equal to the mixture raw material of biomass and c...

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Abstract

The invention discloses a fuel gas preparing method of gasified biology material and coal fluid bed, which comprises the following steps: grinding biology material into grain dimension less than 5 mm; blending the 5 mm grain with 2 mm grain; heating the gasification stove to 700-800 deg.c; putting biology material and coal in the gasification stove; injecting air and steam; keeping the temperature in the stove at 900-1100 deg.c to generate fuel gas without tar. The invention simplifies the technology, which is easy to realize large-scale manufacturing.

Description

technical field [0001] The invention belongs to a method for preparing clean fuel gas, in particular to a method for co-gasifying a mixture of biomass and coal to prepare fuel gas. Background technique [0002] With the decrease of fossil energy, biomass, as an important renewable energy, has attracted the attention of all countries in the world. Biomass fluidized bed gasification technology is an important way to effectively utilize biomass energy. Biomass has high content of volatile components, high carbon reactivity, low content of sulfur, nitrogen and ash, and is more suitable as gasification raw material; There are some disadvantages in separate gasification of materials. First, biomass production is seasonal and cannot be supplied stably. Second, due to the irregularity of biomass particles, it cannot be fluidized independently in a fluidized bed, and bed materials need to be added, such as Sand, which increases power consumption; third, the low energy density of bio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10J3/54
Inventor 毕继诚李克忠宋新朝张荣
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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