Biomass gasifier with preheating recovery function

Abstract

The invention discloses a biomass gasifier with a preheating recovery function. The biomass gasifier comprises a pyrolyzing furnace, wherein a grate is arranged in the pyrolyzing furnace, a feeding port is arranged at the position, above the grate, of the pyrolyzing furnace, a sealed feeder is arranged at the feeding port in a matched mode, a discharging port is arranged at the position, below thegrate, of the pyrolyzing furnace, and a sealed discharger is arranged at the position of the discharging port in a matched mode; the biomass gasifier further comprises an oxygen-free medium-temperature gas source mechanism which is arranged outside the pyrolyzing furnace and supplies smoke to the pyrolyzing furnace; a combustible gas collector is further arranged in the pyrolyzing furnace; and apreheating sleeve is arranged outside the sealed feeder in a sleeving mode, a preheating pipe set is arranged at the position of the preheating sleeve, a cooling sleeve is arranged outside the sealeddischarger in a sleeving mode, a cooling pipe set is arranged at the position of the cooling sleeve, a water inlet / outlet of the preheating pipe set is connected with a heating path of a heat exchanger, and a water inlet / outlet of the cooling pipe set is connected with a cooling path of the heat exchanger. According to the biomass gasifier, a combustor provides an oxygen-free medium-temperature heat source for the pyrolyzing furnace, preheating recovery of carbon slag can be realized, and resourceful and integrated utilization is realized.

Description

technical field [0001] The invention relates to the technical field of biomass pyrolysis, in particular to a biomass gasifier with a preheat recovery function. Background technique [0002] Biomass gasification is under certain thermodynamic conditions, with the help of air (or oxygen) and water vapor, the high polymers of biomass are pyrolyzed, oxidized, reduced and reformed, and finally converted into carbon monoxide and hydrogen. and low molecular weight hydrocarbons and other combustible gases. [0003] The key to biomass gasification lies in the gasifier. The gasifiers currently in use include updraft, downdraft, open and fluidized bed. The reaction process of different biomass is also different. Common gasifier reactions can be divided into oxidation layer, reduction layer, cracking layer and drying layer: [0004] 1) Oxidation layer; the main reaction of biomass in the oxidation layer is oxidation reaction, the gasification agent is introduced from the lower part of...

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Problems solved by technology

[0012] The above-mentioned technical solutions all adopt the conventional gasification furnace arrangement form of oxidation layer, reduction layer, cracking layer and drying layer. However, it is found in the application that since the gasification agent generally uses oxygen-containing normal temperature air, it is introduced into the gas from the lower part of the grate. In the gasification zone, it is difficult to control the combustion reaction, and the temperature is often too high to exceed the optimum precipitation temperature of the biomass to precipitate combustible gas, which ultimately affects the precipitation of combustible gas; and the gas export of conventional gasifiers requires the cooperation of high-power fans. Realize continuous pumping, high energy consumption

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