Two-section circulating fluidized bed biomass gasification system

Abstract

The invention discloses a two-section circulating fluidized bed biomass gasification system. The system comprises a fluidized bed gasification furnace, a bin, a feeder, an ash remover fan, an ash bucket and a second feeder, wherein the fluidized bed gasification furnace is provided with a second inlet; the outlet of the ash bucket is connected with the second feeder; the outlet of the second feeder is connected with an air supply inlet of a burner; the outlet of the burner is connected with the second inlet of the fluidized bed gasification furnace; and biomass char collected by the ash bucket is conveyed into the air supply inlet by the second feeder and fed into a cyclone burner for pyrolysis under the action of wind power to replenish heat for the fluidized bed gasification furnace. Through the system, good pyrolysis effect of biomass powder in the gasification furnace is guaranteed, fixed carbon in the biomass char is fully pyrolyzed through a cyclone burning chamber, and thermal circulation is provided for the fluidized bed gasification furnace for pyrolysis; therefore, waste of heat energy of the biomass powder is avoided, and thermal efficiency of the gasification system can be effectively improved.

Description

technical field [0001] The invention belongs to the field of energy preparation, and in particular relates to a combustion device for biomass gasification. Background technique [0002] With the continuous development of the world economy, energy and environmental issues have become increasingly prominent. The main energy sources currently used by human beings are oil, natural gas and coal. According to the statistics of the International Energy Agency, the lifespan of these three kinds of energy for human exploitation on the earth is only about 35 years, 50 years and 240 years respectively. On the one hand, fossil resources such as coal and oil are increasingly depleted, and energy supply continues to be tight; on the other hand, the excessive use of fossil resources has caused increasingly serious environmental problems. Therefore, developing and searching for new alternative energy sources has become a major issue that must be resolved in the new century for the sustain...

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Problems solved by technology

[0005] Studies have shown that the pyrolysis effect of crushed biomass powder as raw material for biomass gasifier is better, but for some existing fluidized bed biomass gasification and pyrolysis reaction systems, biomass powder is After staying in the high-temperature gasifier for a short time (less than 2 seconds), the high-temperature carrier gas will be brought to the cyclone ash removal device, which makes the biomass coke collected in the cyclone ash removal device reach 20-30%. In addition to the 2% ash content of this part of biomass char, the rest is mainly fixed carbon in the biomass. Since the fixed carbon needs to be pyrolyzed to generate energy under high temperature conditions, its secondary recycling is still a must. There are technical obstacles, resulting in low thermal efficiency of the gasifier, resulting in waste of resources

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