Method and device for air-floatation flow-state high-temperature heat-transfer gasification of biomass

Abstract

The invention discloses a method and a device for air-floatation flow-state high-temperature heat-transfer gasification of biomass. The method comprises the following steps: (1) stirring a biomass gasifying raw material so as to form a mist state; (2) cracking under the heating of high temperature smoke at 800-1000 DEG C so as to obtain high temperature tar gas; (3) carrying out high temperature cracking and gasification on the high temperature tar gas and steam at the temperature of 1050-1150 DEG C; and (4) filtering, condensing and purifying solid residue and gas while stirring so as to obtain gas with a middle heat value. The device comprises a gas making furnace and at least one coke cracking furnace, wherein the gas making furnace comprises a gas collecting chamber and a stirring chamber; and the coke cracking furnace comprises an upper coke cracking furnace gas collecting chamber provided with a coke cracking furnace row tube, and a coke cracking furnace row tube shell layer is communicated with a gas making furnace row tube shell layer. According to the invention, a heat source in the whole cracking and gasification process is derived from high temperature smoke generated by combustion of a biomass micrometer fuel which is a renewable clean energy and is wide in source and low in cost. The method and device provided by the invention have the characteristics of high heatefficiency, high gas making efficiency and high gas heat value.

Description

technical field [0001] The invention belongs to biomass energy technology, and specifically relates to a high-temperature heat-exchanging gasification method and device for biomass air flotation flow state, which is suitable for organic matter and coal, especially for agricultural and forestry waste and pulverized coal pyrolysis gasification reforming to produce fuel gas . Background technique [0002] With the depletion of fossil energy and the seriousness of environmental problems, the development of clean renewable energy and the recycling of waste have become urgent issues. The key point for biomass fuel to become a substitute for fossil fuels such as coal, oil and natural gas is to convert low-grade biomass energy into high-grade energy. [0003] The internal heat gasification method commonly used at home and abroad, it is the incomplete combustion of biomass and air in the gasification chamber, directly heating the biomass to make it gasify. This method has high heat...

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Problems solved by technology

[0006] (1) Internal heating gasification uses air as the gasification agent, and the gasification gas contains a large amount of N 2 and CO 2 , the calorific value of gas is low, the gasification efficiency is low, and a large amount of tar is produced

[0007] (2) Internal thermal gasification uses pure oxygen as the gasification agent, which has high cost and large investment

[0008] (3) In the traditional external heat gasification, the solid gasification raw materials are stored in the gasification chamber and heated indirectly through the furnace wall. Due to the large diameter of the gasification chamber (usually 300-800mm), the heat transfer distance is long and the heat transfer is difficult. Large resistance, thus low heat transfer efficiency, low gasification efficiency, resulting in low energy conversion efficiency

[0009] (4) If the external heating gasification uses electricity, gas or fuel oil as the external heating source, the heating cost is high

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