Fast fluidized calcining process

Abstract

The invention is a novel rapid fluidized calcination process, which effectively improves the conversion rate of the rapid fluidized calcination reaction of materials. It uses high-temperature flue gas to form a gas-solid rapid fluidized mixed heating of the material. Using the characteristics of rapid fluidization, the material is rapidly heated and mass-transferred, and then the high-temperature material enters the moving bed calcination reactor through the high-temperature gas-solid separator; The plug flow of the material in the bed makes the calcination reaction time of the material uniform, the calcination reaction is sufficient, and the conversion rate is high; at the same time, the hot gas separated by the high-temperature gas-solid separator passes through the preheater to preheat the material and then enters rapid fluidized drying The wet material is dried by a device; the sensible heat of the high-temperature material after calcination is recovered by a rapid fluidized cooler, and the material is cooled at the same time. The calcination process of the present invention has the characteristics of low energy consumption, large production capacity and easy scale-up. The material calcination temperature can be adjusted from 500°C to 1300°C, and the calcination reaction time can be adjusted from several minutes to several hours.

Description

technical field [0001] The invention relates to the technical field of calcination reaction, in particular to a rapid fluidized calcination process. Background technique [0002] At present, the calcination process includes fluidized bed, rotary kiln, multi-layer furnace, tunnel kiln and other calcination processes. For the calcination reaction of powder materials, the heat transfer and mass transfer of materials in rotary kilns, multi-layer furnaces, and tunnel kiln calciners are poor, and the materials are heated slowly, resulting in high energy consumption and low production capacity of a single equipment. Although the fluidization technology has the characteristics of fast heat transfer, mass transfer and energy consumption, the existing fluidized bed calcination process, due to the rapid mixing of solid particles in the fluidized bed calcination reactor, when the powder material is continuously fed , The residence time of the powder particles in the fluidized bed calci...

AI Technical Summary

Problems solved by technology

For the calcination reaction of powder materials, the heat transfer and mass transfer of materials in rotary kilns, multi-layer furnaces, and tunnel kiln calciners are poor, and the materials are heated slowly, resulting in high energy consumption and low production capacity of a single equipment

Although the fluidization technology has the characteristics of fast heat transfer, mass transfer and energy consumption, the existing fluidized bed calcination process, due to the rapid mixing of solid particles in the fluidized bed calcination reactor, when the powder material is continuously fed , the residence time of powder particles in the fluidized bed calcination reactor is not uniform, so for the powder material with a long reaction time, the reaction product is not uniform, resulting in a decrease in product conversion rate

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