Biomass air-steam gasification technology
A biomass gas and water vapor technology, applied in the field of gasification, can solve the problems of incomplete mixing of water vapor and reactant, low calorific value, insufficient reaction, etc., and achieve the removal of external heating steps and gas output rate Effect of improving and 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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[0016] refer to figure 1 , the working process of the gasification process of the present invention is as follows: the biomass fuel is lifted from the unloading room 10 by the hoist 14 to the storage bin 8 for storage. The conveyor belt 9 enters the feed bin 6 in front of the furnace, and after being stirred, it is quantitatively input to the gasifier 1 by the screw conveyor 7. At this time, the blower 4 sends air to the gasifier 1 to provide the air required for combustion and control the air equivalent The ratio ER is 0.25, add catalysts, such as dolomite, olivine, alumina, etc., and burn biomass fuel under normal pressure or slightly positive pressure to produce reactants (biomass carbon and reaction gas), and the internal temperature of the gasifier reaches At about 850°C, 0.6Mpa of 120°C water vapor and reactants are introduced to participate in the gasification reaction, and the water vapor / biomass fuel mass ratio S / B is controlled to be 0.5. After a reaction time of abo...
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The invention discloses a biomass air-steam gasification technology comprising steps that: quantified feeding is carried out in front of a furnace; air is delivered during a combustion process; pyrolytic combustion and gasification reaction are carried out in a gasifier; biomass combustion gas is purified; overpressured superfluous combustion gas is discharged; combustion gas heat exchange is carried out; uncombusted fuel is discharged; and the like. The pyrolytic combustion and gasification reaction step comprises processes that: air is delivered into a combustion chamber of the biomass gasifier; biomass fuel is combusted under a normal pressure or a pressurized condition, such that a reactant is obtained; when internal temperature of the gasifier reaches 750 to 1000 DEG C, steam with a temperature of 120 to 160 DEG C and a pressure of 0.2 to 0.8MPa is delivered into the gasifier; the steam takes part in the gasification reaction; with 1 to 2 seconds of reaction, the biomass combustion gas is produced. According to the invention, because of the added step for the steam to take part in the gasification reaction, the reactant obtained through the pyrolytic combustion of the biomass is further subject to a reaction with the steam, such that biomass combustion gas with medium heat value is produced. The heat value is increased by 30 to 40%, and the combustion gas yield is increased by 20%.
Description
technical field [0001] The invention relates to a gasification method, in particular to a gasification process which utilizes air-water vapor as a gasification agent to pyrolyze and combust biomass fuel and gasify 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 650°C) pyrolysis 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, ...
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IPC IPC(8): C10J3/46C10J3/48C10J3/72
Inventor 常厚春马革陈平缪麒张开辉陈燕芳刘安庆
Owner GUANGZHOU DEVOTION THERMAL TECH