A casing type double-sided fluidized bed rapid pyrolysis device

Abstract

The invention relates to a tubular bilateral fluidized bed rapid pyrolysis device, and belongs to the technical field of utilization of renewable energy sources. The rapid pyrolysis device comprises an inner pipe, an outer pipe, a supporting sleeve, an annular air distribution plate, a round air distribution plate, a buffer sleeve, a carrier gas uniform distributor and a spiral plate heat exchanger which are coaxially arranged from top to bottom. According to the rapid pyrolysis device disclosed by the invention, the characteristic of high heat transfer efficiency of the fluidized bed and the wall surface of a container is utilized, the fluidized bed in the inner pipe is used as a reaction zone, an annular fluidized bed is additionally at the periphery as a heating zone, and high-temperature flue gas after combustion is used as fluidized carrier gas, so that the comprehensive heat transfer of a reactor is increased, heat absorbed by biomass pyrolysis can be supplemented, and the whole structure is more compact; meanwhile, the counter-flow type spiral plate heat exchanger is added, so that combustion flue gas waste heat can be fully utilized. By changing the flow of two branches in the rapid pyrolysis device, temperature regulation can be realized on the premise that the unchanged fluidizing gas speed of the reaction zone is ensured, and biomass pyrolysis reactions under different technological conditions can be adapted.

Description

technical field [0001] The invention relates to a sleeve-type double-sided fluidized bed rapid pyrolysis device, which belongs to the technical field of renewable energy utilization. Background technique [0002] Fast pyrolysis is one of the important technologies for biomass energy utilization, which can convert low-quality biomass into liquid products with industrial added value. The reactor is the core part of the biomass pyrolysis process. In order to meet the process requirements, it needs to have the characteristics of high heating rate and short gas phase residence time. At present, the fluidized bed reactor is widely used. Since biomass pyrolysis is a strong endothermic reaction, the local temperature in the fluidized bed will drop rapidly during continuous production. Although the inlet temperature of the carrier gas can be increased to maintain the average temperature in the reactor, the excessive temperature difference makes the control of pyrolysis products very ...

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Problems solved by technology

Chinese patent CN200810024526.8 discloses a single-bed autothermal pyrolysis gasification combustion reactor, which contains a partition plate and a guide pipe, and divides the main body of the reactor into two parts: an upper pyrolysis bed and a lower combustion bed. Rely on the inert heat carrier for heat transfer to provide the heat required by the biomass, but the two beds of the device are connected. Although the particle sealing method is used, there is a blow-by phenomenon and part of the reaction product will be burned.

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