Biomass pyrolysis gasification method

Abstract

The invention discloses a biomass pyrolysis gasification method which comprises the following steps: a biomass raw material is pretreated, namely, the biomass raw material is made into a specificationwith the length of less than 15cm, the width of less than 8cm and the thickness of less than 2cm, and the water content of the biomass raw material is controlled to be 15%-35%; the pretreated biomassraw material is fed into a biomass pyrolysis gasification furnace, and a temperature control device is arranged in the biomass pyrolysis gasification furnace to keep the temperature of a pyrolysis section of the biomass pyrolysis gasification furnace at 1200-1400 DEG C; the biomass raw material is dried in a drying section of the biomass pyrolysis gasification furnace and release water vapor, thewater vapor enters the pyrolysis section under the action of micro-negative pressure of the biomass pyrolysis gasification furnace, and the water vapor, hydrogen, oxygen and tar are fully mixed and contacted at high temperature and are subjected to thermal cracking reaction. The method has the beneficial effects that the biomass raw material pretreatment process is simple, the pretreatment cost is low, tar can be decomposed at high temperature, and the biomass gas heat value level is high.

Description

technical field [0001] The invention relates to a biomass gasification method, in particular to a biomass pyrolysis gasification method. Background technique [0002] The production of biomass originates from the photosynthesis of plants, which metabolizes CO in the atmosphere during the growth process. 2 , so any use of biomass will not increase atmospheric CO 2 content, so biomass is a zero-emission carbon dioxide fuel. In view of the characteristics of biomass recycling and zero carbon dioxide emission, its effective utilization has received more and more attention and attention. [0003] Biomass pyrolysis gasification is to convert solid biomass (usually woody plants, herbaceous plants, and urban wood waste) into small molecule combustible gas fuels, which can be used for gas supply, power generation, or central heating. The existing biomass pyrolysis gasification technology burns part of the biomass with low oxygen, and then uses the heat and remaining oxygen in the ...

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Problems solved by technology

[0004] In industrial applications, water treatment is usually used to remove the tar produced by biomass pyrolysis and gasification. However, this treatment not only consumes part of the heat carried by the gas, but also wastes the energy carried by the tar itself. The defect of low utilization rate, in addition, tar will cause blockage of pipelines and gas ports during the condensation process, increase equipment maintenance and operation costs, and seriously hinder the application of biomass pyrolysis gasification technology