Gasification system of oxygen-enriched biomass circulating fluidized-bed

A technology of circulating fluidized bed and gasification system, which is applied in the gasification of granular/powdered fuel, the manufacture of combustible gas, and the petroleum industry. Large-scale industrial application and other issues, to achieve the effect of increasing heat transfer and improving stability

Inactive Publication Date: 2013-07-17
HEFEI DEBO BIOENERGY SCI & TECH
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  • Application Information

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Problems solved by technology

This method and device have high requirements on the moisture content and particle size of the biomass raw material, and the biomass raw material needs to be dried and pulverized, the operating cost is high, and the economy is poor, so it is difficult to be really applied in actual production
[0004] The Chinese invention patent with the authorized publication number CN101164866A discloses a method and device for preparing synthesis gas by stepwise oxygen-enriched oxidation of biomass. Biomass raw materials are pyrolyzed at low temperature in the absence of air, and all products are sent together to the downdraft The fixed-bed gasification furnace reacts with high-tempera

Method used

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  • Gasification system of oxygen-enriched biomass circulating fluidized-bed

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Effect test

Embodiment 1

[0025] The preheating temperature of the oxygen-enriched air is 351°C. The preheated high-temperature oxygen-enriched air enters from the bottom of the gasification furnace 5, and wood chips with a water content of 18% are fed from the middle and lower part of the gasification furnace 5 through the feeding screw conveyor 2. High-efficiency gasification reaction occurs between medium biomass and high-temperature oxygen-enriched air. The high-temperature gas from gasification furnace 5 passes through cyclone separator 7 and then passes through cyclone dust collector 9, superheater 10, waste heat boiler 11 and preheater 12, The obtained temperature is 420°C and the calorific value is 10800kj / Nm 3 high-quality gas.

Embodiment 2

[0027] The preheating temperature of oxygen-enriched air is 323°C. The preheated high-temperature oxygen-enriched air enters from the bottom of gasification furnace 5, and wood chips with a water content of 10% are fed from the middle and lower part of gasification furnace 5 through feeding screw conveyor 2. High-efficiency gasification reaction occurs between medium biomass and high-temperature oxygen-enriched air. The high-temperature gas coming out of gasifier 5 passes through cyclone separator 7 and then passes through cyclone dust collector 9, superheater 10, waste heat boiler 11 and preheater 12, The obtained temperature is 431°C and the calorific value is 11500kj / Nm 3 high-quality gas.

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Abstract

The invention relates to a gasification system of an oxygen-enriched biomass circulating fluidized-bed. Biomass is fed from the middle-lower part of a gasification furnace, oxygen-enriched air preheated by a preheater and overheated water steam are fed from the bottom of the gasification furnace, the biomass is rapidly fluidized under the assistant action of a bed material to generate pyrolysis and gasification reactions, generated high-temperature fuel gas is subjected to gas-solid separation by using a cyclone separator, carbon residues in the fuel gas and the bed material are fed to the gasification furnace from the lower part of the gasification furnace by a material return device to continuously react, and the high-temperature fuel gas passes through a cyclone dust collector, a superheater, a waste heat boiler and the preheater in sequence and is then separated from the system. According to the gasification system, the volume fraction as well as the dust and tar concentration in the fuel gas can be effectively reduced, the heat value of the fuel gas is increased, and the high-quality clean fuel gas is obtained.

Description

technical field [0001] The invention relates to the field of biomass thermochemical conversion, in particular to an oxygen-enriched biomass circulating fluidized bed gasification system. Background technique [0002] my country is rich in biomass fuel resources, and vigorously developing biomass fuel resources will help improve my country's fossil fuel-based energy structure, which can not only reduce the emission of sulfide and nitrogen oxides, but also alleviate the greenhouse effect. Biomass gasification technology realizes the transformation of low-grade biomass into high-quality gas, which can replace petrochemical energy such as oil and natural gas in many fields. However, in the existing biomass technology, the nitrogen content in the biomass gas is too high, which makes the calorific value of the gas low, which limits the application of biomass gasification technology. Therefore, the use of oxygen-enriched gasification can reduce the nitrogen content in the gas and i...

Claims

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Application Information

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IPC IPC(8): C10J3/56C10J3/84
CPCY02P20/129
Inventor 张守军鲁万宝赵成武吴银龙
Owner HEFEI DEBO BIOENERGY SCI & TECH
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