Double-rapid fluidized bed gasification method and device for biomasses

Abstract

The invention provides a double-rapid fluidized bed gasification method and device for biomasses. According to the method, a biomass pyrolysis and gasification process is mutually coupled with a coke and combustible gas combustion process, wherein the pyrolysis and gasification of the biomasses is finished by a rapid fluidized bed gasification furnace A; the combustion of coke and combustible gas is finished by a rapid fluidized bed gasification furnace B, so as to gasify the biomasses by components of the biomasses; a combustion improver, namely pure nitrogen, does not need to be additionally provided. The device mainly comprises the rapid fluidized bed gasification furnace A, the rapid fluidized bed gasification furnace B, a hopper, a dryer, a spiral feeder, a cyclone separator, a material returning device, a three-way valve, a condenser, a tar collector and an air separator. The double-rapid fluidized bed gasification method and device for the biomasses are suitable for various biomasses including saw dust, rice husks and the like. The content of the tar can be effectively reduced.

Description

technical field [0001] The invention relates to a biomass double fast fluidized bed gasification device and method, belonging to the field of double fluidized bed biomass gasification. Background technique [0002] With the increasingly prominent global energy and environmental issues, changing the way of energy production and consumption and developing renewable energy has important practical significance for the sustainable development of society and the improvement of the ecological environment. Biomass has gradually become one of the key new energy sources due to its renewable, large quantity and clean advantages. In essence, biomass is a solid fuel containing hydrocarbons. The utilization methods of biomass mainly include biomass combustion technology, biomass pyrolysis technology, biomass direct liquefaction technology and biomass gasification technology. [0003] Biomass gasification technology is a hot research direction in the field of energy in the world in recen...

AI Technical Summary

Problems solved by technology

At present, biomass gasification application devices are mainly concentrated in fixed-bed gasifiers, which have disadvantages such as high tar content in combustible gas, large amount of gasification agent water vapor, and low gasification efficiency during the biomass gasification process.

Countries such as Europe and the United States have proposed fluidized bed gasifier devices, which have the advantages of strong raw material adaptability, large production capacity and strength, and wide adjustment range, but there are problems such as low coke gasification rate, difficult control, and large tar output. And the disadvantages of low calorific value of gas production

Images