Chain fluidization drying machine

Abstract

A chain fluidization drying machine comprises a drying machine body and auxiliary equipment thereof, wherein the drying machine body comprises a housing; an air distribution device for bearing material and meeting fluidization and air distribution requirements is arranged inside the housing; an air compartment for distributing fluidization air for the drying machine is arranged below the air distribution device; the air compartment is communicated with a heat supply device at the exterior of the housing through an air distribution pipe; two ends of the air distribution device are supported by a driving roller and a driven roller respectively, so that the air distribution device runs in a conveyor belt manner; the material is discharged from a material outlet positioned in the bottom of the housing after heat exchange on the air distribution device; smoke dust enters a separator through a smoke flue positioned at the top of the housing to complete separation of the material and the smoke dust. According to the chain fluidization drying machine, the broken rate of material particles can be reduced, the reaction / drying time of reaction / drying material in the drying machine is prolonged, the reaction is flexible to adjust, remote control operation can be realized, and the machine has the advantages of good material adaptability, few broken particles, high reaction / drying efficiency, continuous material feeding and discharging, large processing capacity, stable quality of finished products, easiness in operation and control, energy saving and the like.

Description

technical field [0001] The invention belongs to the technical field of material reaction / drying in the chemical industry, and in particular relates to a chain type fluidized dryer. Background technique [0002] Fly ash is a solid waste discharged from coal-fired boilers with flue gas. It is a glassy solid particle formed by melting impurities and quenching when coal is burned at high temperature. The main chemical composition of fly ash is Al 2 o 3 and SiO 2 , the sum of the two amounts to more than 80%. Comprehensive utilization of fly ash to extract alumina is a high value-added utilization of secondary resources. The research has shifted from theoretical and experimental research to pilot and industrial test research, but the technical routes available for industrial production are still very limited. [0003] The alkali roasting method has made some progress in industrial application due to its simple process, but because of its inherent defects, the whole process i...

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Problems solved by technology

[0003] The alkali roasting method has made some progress in industrial application due to its simple process, but because of its inherent defects, the whole process is immature or uneconomical, making production unsustainable; Corrosion requirements are high, the investment cost is huge, and the research has been in the theoretical and laboratory stages, and the road to industrialization is still relatively long; while the ammonium sulfate method, which has a relatively mild reaction and can control the amount of slag, has not yet realized industrial production, mainly because the process It has been unable to solve the problem that ammonium sulfate and fly ash are mixed and roasted to produce aluminum sulfate or ammonium aluminum sulfate. The melting point of ammonium sulfate and ammonium aluminum sulfate is low, and they will quickly form a molten state during the reaction process, and ammonium sulfate is easy to decompose , after decomposition, it will not be able to combine with Al in fly ash 2 o 3 react, resulting in Al 2 o 3 The extraction rate is not high

[0004] China Huaneng Group Clean Energy Technology Research Institute in its 1MW th The circulating fluidized bed combustion test bench has carried out experimental research on the extraction of alumina by the ammonium sulfate method. The research results show that the use of fluidized roasting for the extraction of alumina by the ammonium sulfate method is conducive to uniform heat transfer and faster reaction of the material, but in conventional fluidization In the bed reaction furnace, after 5 minutes of entering the furnace, the materials are all ground by the inert medium, and the residence time of the materials in the lower part of the furnace is short, which cannot meet the requirements of the roasting time, resulting in a low extraction rate.

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