Biomass liquefaction system

Abstract

The invention discloses a biomass liquefaction system, which comprises a drying oven, a fluidized bed reactor, a gas-solid separator and a two-stage spray tower, wherein a discharge outlet of the drying oven is communicated with a feed inlet of the fluidized bed reactor, a cracking gas outlet of the fluidized bed reactor is communicated with a cracking gas inlet of the gas-solid separator, a cracking gas outlet of the gas-solid separator is communicated with a cracking gas inlet of the two-stage spray tower, and a non-condensable gas outlet of the two-stage spray tower is communicated with a hearth of the drying oven; and the bottom of the fluidized bed reactor is communicated with an air blower with the output air velocity of 600-800m<3> / h and pressure of 2-4kpa. The air blower is used for supplying low-velocity air for the bottom of the fluidized bed reactor, a biomass fuel is at a gently rolling state and has slow gasification reaction, the yield of cracking gas can be increased, the carbon yield can be reduced and the cracking gas contains extremely low heat carriers, an auxiliary reactor is omitted, and the system running safety can be improved.

Description

technical field [0001] The invention belongs to the technical field of liquefaction, and in particular relates to a system for preparing ecological oil by liquefaction of biomass fuel. Background technique [0002] The main process of the ecological oil preparation process is: the biomass raw material reacts in the fluidized bed reactor to produce cracked gas, the cracked gas passes through the gas-solid separation step of the separator to separate the carbon and heat carrier contained in the gas, and the clean cracked gas passes through The cooling step of the condensation tower forms ecological oil, and the non-condensable gas needs to be released and burned directly or recycled to supply the drying furnace to burn to generate heat to dry the biomass raw material. [0003] The gasification reaction system of the prior art uses a circulating fluidized bed as the main reactor, which belongs to a fast gasification reaction, and the output of cracked gas is low, and because th...

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Problems solved by technology

[0003] The gasification reaction system of the prior art uses a circulating fluidized bed as the main reactor, which belongs to a fast gasification reaction, and the output of cracked gas is low, and because the mixed amount of carbon and heat carrier contained in the gas is large, the gasification The subsequent steps of the solid separator also need to add a secondary reactor to fully burn the charcoal and heat carrier and then circulate them to the circulating fluidized bed reactor for use, making the composition and structure of the entire system redundant and complicated, and recycling charcoal to provide heat. The carrier supplements heat, which increases the risk of system operation

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