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Biomass air-water vapor gasification method

A water vapor and biomass technology, applied in the field of gasification, can solve the problems of incomplete mixing of water vapor and counter-reactants, low calorific value, and insufficient reaction, so as to eliminate the external heating step and increase the gas output rate , The effect of saving external energy

Inactive Publication Date: 2012-03-07
GUANGZHOU DEVOTION THERMAL TECH
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Problems solved by technology

However, this gasification method has not been widely used. The reason is that the water vapor addition point is too concentrated, resulting in incomplete mixing of water vapor and reactants, and insufficient reaction, which ultimately leads to low output rate of the prepared biomass gas. , and the calorific value is low, it cannot be industrialized on a large scale

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  • Biomass air-water vapor gasification method
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Embodiment Construction

[0012] The process of the biomass air-steam gasification method of the present invention is as follows: feed air into the combustion chamber of the biomass gasifier, control the air equivalent ratio ER to be 0.25, add catalysts, such as dolomite, olivine, alumina, etc., Combustion of biomass fuel under normal pressure or slight positive pressure produces reactants (biomass carbon and reaction gas). When the internal temperature of the gasifier reaches about 850°C, 0.6Mpa of 120°C water vapor is introduced to participate in the reactants. For gasification reaction, the water vapor / biomass fuel mass ratio S / B is controlled to be 0.5, and after 2s reaction time, biomass gas is produced.

[0013] Realize the gasifier of the present invention, as figure 1 As shown, a 0.5 ton / hour gasifier is used, and the fluidized bed is the best. The furnace body 1 of the gasifier is connected with a water steam pipeline assembly to provide high-temperature water vapor to the combustion chamber ...

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Abstract

The invention discloses a biomass air-water vapor gasification method, which comprises the following steps: introducing air in a combustion chamber of a biomass gasifier, combusting biomass fuels to generate a reactant under the condition of normal pressure or micro-positive pressure, introducing water vapor with 0.2-0.8 MPa and 120-160 DEG C of temperature to carry out gasification reaction with the reactant when the temperature in the gasifier reaches 750-1000 DEG C, and generating biomass combustion gas after 1-2 seconds reaction time. Because a step for introducing water vapor in gasification reaction is added, the reactant generated by pyrolyzing biomass fuels is reacted with water vapor further to prepare medium heating value biomass combustion gas, the heating value can be increased by 30-40% and the output rate of combustion gas can be increased by 20%.

Description

technical field [0001] The invention relates to a gasification method, in particular to a gasification method which uses air-water vapor as a gasification agent to participate in a gasification reaction to produce biomass gas. Background technique [0002] Biomass gas is a green energy that can replace fossil energy. Its raw materials are biomass materials, such as straw, bagasse, rice straw, rice husk (bran), waste wood, bark, sawdust, wood chips, etc., through The gasification equipment can produce biomass gas after its high-temperature (above 750°C) gasification reaction. [0003] Biomass gasification to produce fuel gas is an advanced thermochemical conversion method of biomass energy. According to the different gasification media, it can be divided into air gasification, oxygen gasification, and high-temperature steam gasification. Biomass gasification using air as the gasification medium has the advantages of low investment and strong operational feasibility, and is w...

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Application Information

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IPC IPC(8): C10J3/46C10J3/54C10J3/56C10J3/72
Inventor 常厚春马革陈平缪麒张开辉陈燕芳刘安庆
Owner GUANGZHOU DEVOTION THERMAL TECH