Biomass gasification method and biomass gasification furnace

Abstract

The invention provides a biomass gasification furnace which comprises a furnace body and a furnace cover. The furnace body consists of a feed port, a drying chamber, an oxidizing chamber, a combustion chamber, a combustion-supporting gas inlet, a secondary cracking chamber and an ash outlet. The drying chamber is communicated with the feed port and is arranged below the feed port, and a first gas outlet is arranged at the upper part of the drying chamber. The oxidizing chamber is communicated with the drying chamber and is arranged at the lower part of the drying chamber. The combustion chamber is communicated with the oxidizing chamber and is arranged at the lower part of the oxidizing chamber. The combustion-supporting gas inlet is arranged at the lower part of the furnace body and is communicated with the combustion chamber. The secondary cracking chamber is arranged at the outer side of the combustion chamber; the inner wall of the secondary cracking chamber serves as the outer wall of the combustion chamber; the secondary cracking chamber is provided with a gas inlet and a second gas outlet; and the gas inlet is connected with the first gas outlet through a circulating pipeline. The ash outlet is arranged at the bottom of the furnace body. Biomass has cracking reaction for two times in the biomass gasification furnace and the obtained combustible gas is low in tar content, so the quality of the combustible gas is improved.

Description

technical field [0001] The invention relates to the technical field of biomass energy conversion application, in particular to a biomass gasification method and a biomass gasification furnace. Background technique [0002] As a large agricultural country, my country has abundant crop straw production. As energy sources such as coal and liquefied gas replace straw as daily fuel, and it takes time and effort to collect and turn over straw, a large amount of straw is directly burned in the field to enhance soil fertility. However, the direct burning of straw will cause dense smoke and dust suspension, which will seriously pollute the air environment, reduce visibility, and increase traffic accidents, especially when wet straw is incompletely burned. NO x , SO 2 、CH 4 Such substances can deteriorate air quality, induce respiratory, lung and eye diseases, and affect human health. [0003] Crop stalks, branches, dried weed husks, and sawdust are organisms that contain bioenerg...

AI Technical Summary

Problems solved by technology

The traditional biomass gasification furnace increases the detours of the gas flow and prolongs the residence time of the gas in the furnace to crack more tar. However, due to the relatively fast flow rate, only a small amount of tar can be cracked, and the final combustible gas Medium tar content is still high

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