Device and method for preparing fuel gas through gasification of biomass horizontal gasification furnace

Abstract

The invention provides a device and a method for preparing fuel gas through gasification of a biomass horizontal gasification furnace, a horizontal furnace body is adopted, so that the height of the furnace body is reduced; the temperature of produced fuel gas is detected in real time through the thermometer, feeding is performed when the detected fuel gas temperature is higher than the control temperature, and feeding is stopped when the detected fuel gas temperature is lower than the control temperature, so that the height of the material layer in the gasification furnace is adjusted, the temperature of discharged fuel gas is adjusted, the content of liquid tar in the fuel gas is greatly reduced, and the fuel gas is convenient to convey and use; meanwhile, the sealing performance of the horizontal furnace body is achieved through a first-stage feeding valve, a second-stage feeding valve, a material distributing device, a nitrogen sealing structure and the like, the air leakage amount of the horizontal furnace body is reduced, and the gas heat value and safety are improved; cooling heat generated by the horizontal furnace body and the like is fully recycled through the water cooling jacket, the air cooling jacket and the like in the horizontal furnace body, and heat dissipation loss is reduced; by means of the two-stage carbon pushing device, the scraper and the slag cooler, ash and coke do not make contact with water in the whole process, it is guaranteed that the ash and the coke are dry carbon, and the economic utilization value of the carbon is increased.

Description

【Technical field】 [0001] The invention belongs to the field of biomass gasification equipment, and relates to a device, in particular to a device and method for gasifying a biomass horizontal gasification furnace to produce fuel gas. 【Background technique】 [0002] Biomass gasifier furnace types include: fixed bed, fluidized bed, entrained bed. Fixed bed gasification has high efficiency, low requirements on raw material moisture content and size, simple structure, low investment cost, convenient operation and maintenance, and is especially suitable for small-scale biomass gasification. The fixed bed is subdivided into: updraft, downdraft, cross-suction, and two-stage (secondary air intake), of which the updraft and downdraft are the main ones. Advantages of updraft fixed bed over downdraft: lower requirements for moisture content of raw materials, less ash in gas, low gas temperature, high thermal efficiency; Disadvantages: tar content of gas produced by updraft is much hig...

AI Technical Summary

Problems solved by technology

Advantages of updraft fixed bed over downdraft: lower requirements for moisture content of raw materials, less ash in gas, low gas temperature, high thermal efficiency; Disadvantages: tar content of gas produced by updraft is much higher than that of downdraft, updraft gas 10-20% mass content is tar, the downdraft type is only about 1g / m 3

[0003] However, the traditional updraft fixed bed has the following problems: (1) The height is high, the temperature of the gas discharged from the furnace is between 80-300 ° C, and the tar mostly exists in liquid form, and the tar content is high, which affects the gas transmission and use

(2) The feeding system carries a certain amount of air into the horizontal furnace body, and the sealing effect of the feeding system is poor, which reduces the quality of gas

(3) The charcoal output system mostly adopts a water-sealed structure, and the charcoal produced is wet charcoal, which affects the economic value of charcoal

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