Gasification and high-temperature tar removal and dust removal integrated technology of biomass circulating fluidized bed

Abstract

The invention discloses a gasification and high-temperature tar removal and dust removal integrated technology of a biomass circulating fluidized bed. Biomass particles which are smaller than 5 mm andsupplemented heat carriers enter the bottom of the circulating fluidized bed, pyrolysis, combustion and gasification reactions occur at the temperature of 750-900 DEG C, and residual semi-coke and heat carriers are carried at high speed, go upward along with synthesized gas to reach the top of the circulating fluidized bed, and then are subjected to four-stage gas-solid separation; in the first stage of separation, the large-particle carriers and the semi-coke are used as a fuel gas pyrolysis catalyst and a filtering material for filtering and dust removing, enter a movable bed filter device,and then return to a turbulence fluidized bed for a gasification reaction after super-thin dust is separated out, and the super-thin dust is delivered out as silicon-potassium products; in the secondstage of separation, the medium-small particle carriers and the semi-coke are directly circulated back to the turbulence fluidized bed, in the third stage of separation, fine particles are dischargedas silicon-potassium products, in the fourth stage, the movable bed filter device conducts secondary catalytic pyrolysis on a small amount of tar in fuel gas at the temperature of 700-850 DEG C through synergism of the high-temperature carriers and semi-coke to obtain methane, ethylene and others, meanwhile, the super-thin dust is removed, and purified fuel gas is delivered out as products.

Description

1. Technical field [0001] The invention provides an integrated process of biomass circulating fluidized bed gasification and high-temperature tar removal and dust removal, which belongs to the field of biomass energy. 2. Background technology [0002] my country's biomass resources are huge, and it is a low-sulfur and CO 2 "Zero-emission" renewable clean energy plays a vital role in world energy security and carbon emission reduction. [0003] As one of the main methods of large-scale, efficient and clean utilization of biomass energy, gasification technology converts low-energy-density biomass from solid state into lower molecular weight and high-grade CO, H 2 、CH 4 Compared with direct combustion, it has the advantages of stable combustion, high thermal efficiency, low pollution, especially low PM2.5 index, and can be widely used in various fields of industrial and agricultural production, such as the current centralized gas supply, heating and power generation, Industr...

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Problems solved by technology

[0006] The purpose of the present invention is to provide an integrated process of biomass circulating fluidized bed gasification and high-temperature tar removal and dust removal in order to overcome the shortcomings of the existing biomass gasification technology. Integrated tar and dust purification, no phenol water, high system thermal efficiency, low energy consumption, large processing scale

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