Reaction kettle type heating system for heat transfer reaction of material in chemical industry

Abstract

The invention relates to a reaction kettle type heating system for a heat transfer reaction of a material in a chemical industry. The reaction kettle type heating system comprises a reaction kettle body, heating devices and stirring devices, wherein the heating devices and the stirring devices are arranged in a multilayer manner at intervals in the reaction kettle body, a discharging device is arranged at the lower part or the bottom of the reaction kettle body, an air inflation-material distribution device is arranged at the upper part of the reaction kettle body, a plurality of temperature measuring devices are arranged in the reaction kettle body, and each temperature measuring device corresponds to one heating device and is distributed between one heating device and one stirring device. The reaction kettle type heating system has the advantages of low raw material machining requirement, good reaction environment, high production efficiency, good operation stability, controllable reaction time, easiness in cleaning, convenience in observing and the like.

Description

Technical field [0001] The invention belongs to the technical field of material heat exchange reaction, and particularly relates to a reaction kettle type heating system used for material heat exchange reaction in the chemical industry. Background technique [0002] Fly ash is the solid waste discharged with flue gas from coal-fired boilers. It is the glassy solid particles formed by the melting of impurities and quenching of coal 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-scale and industrialized experimental research, but the technical routes that can be used for industrialized production are still very limited. [0003] The alkali roasting method has made some progress in industrial ...

AI Technical Summary

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] 1MW before th The circulating fluidized bed combustion test bench carried out experimental research on the extraction of alumina by the ammonium sulfate method. The results of the research showed 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 under the conditions of the test bench , 5 minutes after the material enters the furnace, it is all ground by the inert medium, and the material stays in the lower part of the furnace for a short time, which cannot meet the requirements of the roasting time, resulting in a low extraction rate

Images