Cracking type biomass gasifier in tar furnace

Abstract

The invention pertains to the technical field of biomass energy utilization and particularly relates to a device which adopts biomass for preparing gas and comprises a lower furnace door, an ash discharging mouth, an ash bin, a grate, a combustion chamber, a thermal insulation bin, a gas inlet, a storage bin, a feed inlet, a furnace cover, a gas pipe, a gas outlet, a porous medium, an air secondary inlet, an air primary inlet and an air pipe; the cracking type biomass gasifier is characterized in that: a gas primary outlet, the porous medium, the gas pipe and the gas outlet form a gas transmission pipeline which is arranged in the storage bin; the gas transmission pipeline is a U-shaped pipe or a spiral coil; and the porous medium is thermal storage ceramic material or tar catalyst material such as dolomite, olivine, clay ore, charcoal, alkali metal compound, nickel base, etc. When going through a combustion area through the gas pipe, the gas is not mixed and burned with the air in the combustion area, therefore, the difficult technical problem that the air and the gas in the existing down-draft biomass gasifier are easy to be burnt out; and the gas can be heated in the combustion area through the gas pipe, and the tar contained in the gas is further converted through the thermal storage, filtering and catalysis of the porous medium, thus reducing the tar content of the biomass gas, and simultaneously improving the conversion rate and the thermal value of gas.

Description

Technical field: [0001] The invention belongs to the technical field of biomass energy utilization, in particular to a device for preparing gas by using biomass. Background technique: [0002] To a large extent, biomass gasification technology can solve the problems of environmental pollution caused by low energy utilization efficiency in rural areas and improper disposal of remaining straw. At present, there are two types of biomass gasifiers: fixed bed and fluidized bed. Among them, the fixed bed gasifier has the advantages of simple structure, easy manufacture, low cost, easy operation, and is suitable for bulk and large particle raw materials. There are two types of fixed bed gasifiers: updraft and downdraft. As for the updraft gasifier, there are disadvantages such as slow gas production, high tar, easy to burn out, overhead, and time-consuming and labor-intensive filling. The existence of tar has many adverse effects on gasification. First, it reduces the gasificati...

AI Technical Summary

Problems solved by technology

However, the addition of a purification device to the updraft gasifier leads to a relative increase in manufacturing costs

Downdraft gasifier, because the gas produced must pass through the throat structure, a large amount of gas is generated in this area at the same time, the gas flow rate increases, and there are solid materials in the channel, the gas flow resistance increases, the power consumption increases, and causes The pressure in the pyrolysis zone increases, the sealing of the upper feed port is difficult, and it is easy to smoke; and because the generated combustible gas passes through the combustion zone, the requirements for the furnace structure design, air distribution, and material properties are strict.

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