Method for preparing biological oil through vacuum pyrolysis of biomasses

Abstract

The invention relates to a method for preparing biological oil through vacuum pyrolysis of biomasses, which comprises the following technological processes: (1) vacuum pyrolysis: adding raw materials after pretreatment into a reaction kettle, and heating a peripheral pipe type furnace to raise the temperature for pyrolysis, wherein a heat conducting device is arranged in the reaction kettle; (2) condensation: introducing volatile components (mainly comprising water vapor) at a low temperature into a drying tower, and guiding the volatile components at a high temperature into a coil condenser for condensation, wherein the online sampling can be achieved in the process of the pyrolysis; and (3) absorption: absorbing the water vapor in incondensable gas by the drying tower and absorbing nitride and sulfide by a bubbling absorption bottle so as to effectively reduce the pollution caused by vacuum pump oil. The method partially solves the problem of temperature rise hysteresis caused by the low heat transfer efficiency of the biomasses in the process of the temperature rise and the problem of low condensation efficiency and the online sampling, and simultaneously the method preliminarily reduces the water content in the biological oil.

Description

technical field [0001] The invention discloses a method for recovering biomass solid waste, in particular to a method for producing bio-oil by pyrolysis under a certain degree of vacuum. Background technique [0002] With the increasing scarcity of fossil energy, biomass energy has begun to attract attention due to its low toxicity, low pollution and abundant reserves. [0003] Biomass thermochemical conversion technology is a kind of biomass energy utilization technology, in which vacuum cracking is a technology with liquid phase bio-oil as the main target product, which converts biomass raw materials into non-condensable gas under a certain degree of vacuum and temperature , three energy forms of bio-oil and coke. Biomass is first converted into volatile matter at high temperature, and the volatile matter is converted into bio-oil and non-condensable gas after passing through the condensing device. The composition of volatile matter is similar to flue gas, and the common...

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Problems solved by technology

[0004] Technical problem: The purpose of the method of the present invention is to provide a method for preparing bio-oil by vacuum cracking of biomass, which can improve the condensation effect of volatile components and realize online sampling of samples. At the same time, it can increase the heat transfer efficiency in the reactor and properly reduce the oil phase The content of water in the medium partly solves the problem of difficult subsequent separation of pyrolysis oil

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