Fluidized bed pyrolysis reaction furnace and reaction method for heating by molten salt

Abstract

The invention discloses a fluidized bed pyrolysis furnace heated by molten salt. The fluidized bed pyrolysis furnace comprises a feeder, a fluidized bed pyrolysis furnace body, a cyclone separator, afirst-stage bio-oil condensation box and a second-stage bio-oil condensation box, which are sequentially connected. The feeder is composed of two stages of hoppers and a spiral feeder, which are arranged in the height direction of the pyrolysis furnace, and used for providing materials. The fluidized bed pyrolysis furnace is composed of a CO2 air inlet, a cracking furnace vertical hearth and a cracking furnace horizontal hearth, and a molten salt heat exchange guide pipe is arranged in the fluidized bed pyrolysis furnace and used for achieving material cracking. The cyclone separator is used for separating a solid-gas product to obtain the pyrolytic carbon. The two bio-oil condensation tanks are used for condensing bio-oil with different boiling points in a grading manner. Uncondensed gasis input into the CO2 air inlet, so that cyclic utilization is realized. Heat released by condensation of the bio-oil is used for drying raw materials, so that waste heat utilization is achieved. According to the fluidized bed pyrolysis furnace, efficient separation of products can be achieved. The fluidized bed pyrolysis furnace has the advantages of being simple in structure and convenient to operate.

Description

technical field [0001] The invention belongs to the field of biomass pyrolysis, and in particular relates to a fluidized bed pyrolysis reaction furnace and a reaction method for heating by molten salt. Background technique [0002] The reaction material particles inside the fluidized bed reactor are in a fluidized state, and in this state the reaction material particles show the characteristics of a fluid. When the fluid passes through the bed within an appropriate speed range, the material particles are suspended in the bed and exhibit irregular motion. As the fluid speed increases, the irregular motion of the particles intensifies. When the fluid passes through the bed speed to a certain value, the material The particles become loose, the distance between the particles increases, and the bed volume begins to expand. [0003] Conventional fluidized bed heat sources usually come from electric furnaces or high-temperature flue gas heat exchange. In industrial applications, e...

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Problems solved by technology

[0005] The above pyrolysis furnace is heated by high-temperature flue gas, its specific heat capacity is low, and the temperature uniformity in the furnace is poor, so it is impossible to realize the precise control of the temperature inside the fluidized bed furnace cavity; Inhomogeneous; in addition, the design of the flow field is unreasonable, the residence time in the material furnace is short, and the thermal cracking is not sufficient. It is necessary to develop a thermal cracking reaction furnace with a new type of heating medium

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