Method and device for making fluid bed to produce super high-temperature fume

Abstract

The invention discloses a method and a device to produce the super high-temperature flue gas with a fluidized bed, and belongs to the fluidized bed gasification combustion technical field. With the invention, inferior coal is gasified by a fluidized bed gasification furnace to produce coal gas, and the semi-coking coal gas is conveyed to a fluidized bed flue gas generation furnace arranged side by side with the gasification furnace. The large excess-coefficient air is fed into the flue gas generating furnace to make the coke completely burned and produce the flue gas. The coal gas and the flue gas are fed into a complete combustion chamber for mixed combustion to produce the super high-temperature flue gas between 1200 DEG C and 1500 DEG C. The device comprises a crusher, a coal feeding device, the fluidized bed gasification furnace, a gasified semi-coke conveying device, the fluidized bed flue gas generation furnace, a gasification medium conveying device, a blower, a coal gas combustor, and an air induction device. The device is characterized in that the device is provided with a good applicability for fuel, a high fuel utility rate, little discharged pollutants, and so on, so the invention is favorable for promoting the quality of solid material drying, roasting and calcining, and increased the output of dried, roasted and calcined solid material. As the novel energy-saving equipment, the device is simple in the manufacture, convenient for operation, flexible for adjustment and stable in combustion, and is provided with an obvious energy-saving effect.

Description

technical field [0001] The invention belongs to the technical field of fluidized bed gasification combustion, and in particular relates to a method and a device for generating ultra-high temperature flue gas in a fluidized bed. Background technique [0002] At present, in the industrial production of building materials, chemical industry and metallurgy, a large amount of high-temperature flue gas needs to be used as drying, roasting and calcination medium. Commonly used methods for generating high-temperature flue gas include blast furnace gas combustion, pulverized coal injection combustion, coal gasification combustion, and fluidized bed high-temperature flue gas generator. The methods and devices adopted are different from each other, each of which has certain problems and deficiencies. Most of the existing domestic technologies related to fluidized bed generation of high-temperature flue gas use a single hearth of fluidized bed for direct coal combustion or coal gasific...

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Problems solved by technology

However, in practice, it is found that due to the ash melting point of coal, the high-temperature flue gas produced by the fluidized bed high-temperature flue gas furnace cannot exceed 1200 ° C, which seriously limits its application range

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