Biomass quick cracking device based on internal-external circulation spouted fluidized bed

Abstract

The invention discloses a biomass quick cracking device based on an internal-external circulation spouted fluidized bed. The biomass particles are added through a bottom feeding chamber and conveyed into a pyrolysis reactor by spouted wind and generate a violet pyrolysis reaction through a guide pipe and a spouting area; the unreacted relatively large biomass particles form internal circulation along with a circulation medium through an annular space area; a catalyst and the unreacted tiny biomass particles are separated from the reaction area along with the pyrolysis gas and then return back into the bottom feeding chamber through a cyclone separator and a return feeder to form external circulation, and generate a pyrolysis reaction again. The device can perfectly meet the requirements of short gas phase retention time and sufficient solid phase reaction of the biomass pyrolysis technology, and the structure is simple and easy to enlarge; meanwhile, the external circulation of the catalyst particles and the early premixing and preheating thereof with the biomass particles in the bottom feeding chamber facilitate the direct efficient contact and sufficient mixing of the catalyst particles and the biomass particles, the utilization efficiency of the catalyst can be effectively improved, and the dosage of the catalyst is reduced.

Description

technical field [0001] The invention relates to a biomass rapid cracking device based on an internal and external double-circulation spouted fluidized bed, which is used for producing bio-fuel, and belongs to the renewable energy utilization technology. Background technique [0002] Rapid pyrolysis of biomass to produce bio-oil is an efficient and clean modern utilization technology of biomass energy. Rapid pyrolysis technology can convert low-quality biomass into high-quality bio-oil, and the obtained bio-fuel has a wide range of uses. It can replace petroleum directly as fuel to a certain extent, and can also be made into clean and environmentally friendly power fuel, and can also be extracted from it. It is a commercially valuable chemical product and a renewable new type of liquid energy. my country is a large agricultural country, and the amount of agricultural and forestry waste is considerable. In 2012, the output of crop straw was 730 million tons, equivalent to 350...

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Problems solved by technology

[0005] Purpose of the invention: Aiming at the contradiction in the rapid pyrolysis process of biomass, when the gas velocity is too fast, the biomass is too late to completely react and is easily carried out of the bed, and when the gas velocity is too slow, it is easy to produce a secondary cracking reaction. Biomass fast pyrolysis device with double-circulation spouted fluidized bed to produce biofuel

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