Low-high temperature combined normal-pressure powder coal gasification furnace and gasification technological method

Abstract

The invention discloses a low-high temperature combined normal-pressure powder coal gasification furnace and a gasification technological method. The low-high temperature combined normal-pressure powder coal gasification furnace adopts the structure that a high-temperature gasification furnace is communicated to the one end of a gas pipe of which the other end is communicated with a low-temperature gasification furnace; the high-temperature gasification furnace has a vertical cylindrical furnace body; a gas outlet pipe is arranged at the lower part of the cylindrical furnace body. As the low-temperature gasification furnace and the high-temperature gasification furnace are combined together, powder coal, which does not reacts at the moment and is carried by gas from the low-temperature gasification furnace, reacts with a gasifying agent again in the high-temperature gasification furnace, organic materials in coal gas are decomposed completely, and the vast majority of carbon dioxide in feed gas is converted into carbon monoxide, dust in the coal gas is dissolved completely, carbon in the dust is recovered almost completely. The content of effective gas in outlet coal gas of the high-temperature gasification furnace can reach 78 to 85 percent, the carbon content of slag is about 0.5 percent, the carbon use ratio is larger than or equal to 99 percent. The low-high temperature combined normal-pressure powder coal gasification furnace and the gasification technological method have the advantages that the coal gas cost is reduced greatly; the economic benefit is considerable; the environmental problem of dust pollution is solved thoroughly.

Description

technical field [0001] The invention belongs to the technical field of coal gasification, and in particular relates to an atmospheric pressure pulverized coal gasification furnace and a gasification process. Background technique [0002] Coal gasification technology is of great significance for the rational and effective use of coal and the maximum improvement of coal utilization. There is still a lot of room for development and innovation. Atmospheric pressure pulverized coal gasifier is an important equipment for coal gasification technology. The old-fashioned atmospheric pressure pulverized coal gasifier is an atmospheric pressure fluidized bed gasifier that uses cheap pulverized coal as raw material to produce fuel gas and synthesis gas. [0003] Features of the old atmospheric pulverized coal gasifier: [0004] Cheap pulverized coal is used as raw material. [0005] It can produce gas up to 1100-2300 kcal. [0006] The operation and maintenance are simple, an...

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Problems solved by technology

[0010] The carbon content in the dust is relatively high (nearly 30%), so the carbon utilization rate is relatively low (≤93%)

[0011] The reaction temperature in the furnace is low (950-1050°C), and the circulating water contains phenol and other organic substances, causing environmental pollution

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