Up-suction pyrolysis gasification system

Abstract

The invention discloses an up-suction pyrolysis gasification system. The system includes a pyrolysis furnace, a grate is arranged in the pyrolysis furnace, the part, located above the grate, of the pyrolysis furnace is provided with a material inlet, and the part, located below the grate, of the pyrolysis furnace is provided with a material discharge opening; the system further includes an oxygen-free medium-temperature gas source mechanism which is arranged outside the pyrolysis furnace and supplies flue gas to the pyrolysis furnace, the oxygen-free medium-temperature gas source mechanism includes a burner, an inlet of the burner is connected to an input pipe for supplying fuel gas to the burner, the fuel gas is burned in the burner to produce the flue gas, an outlet of the burner is connected to a flue gas output pipe, a flue gas delivery pipe is introduced into the pyrolysis furnace and is located below the grate, and the tail end of the flue gas delivery pipe is connected to a medium-temperature heater; the part, located above the grate, of the pyrolysis furnace is provided with a combustible gas collection opening to form an up-suction structure; and the combustible gas collection opening is led out to the outside of the pyrolysis furnace through a fuel gas collection pipe. The system ensures the precipitation effect of the combustible gas and realizes the resource comprehensive treatment.

Description

technical field [0001] The invention relates to the technical field of biomass pyrolysis, in particular to an updraft pyrolysis gasification system. 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 the grate,...

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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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