Low-density composite ceramic ball for fluidized bed as well as preparation method and application of low-density composite ceramic ball

A technology of composite ceramics and curing agent, applied in fluidized bed heat exchangers, lighting and heating equipment, indirect heat exchangers, etc., can solve problems such as weak thermal shock resistance, uneven fluidization, and difficult circulation, and achieve High mechanical strength and corrosion resistance, uniform fluidization and distribution, and superior comprehensive performance
CN114773036AActive Publication Date: 2022-07-22TIANJIN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
TIANJIN UNIV
Publication Date
2022-07-22

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Abstract

The invention provides a low-density composite ceramic ball for a fluidized bed as well as a preparation method and application of the low-density composite ceramic ball. The preparation method of the composite ceramic ball is a sol-gel method and comprises the following steps: (1) preparing silicon-zirconium-aluminum sol; (2) molding and curing the silicon-zirconium-aluminum sol obtained in the step (1) to obtain gel beads, and performing aging treatment on the gel beads to form a precursor; and (3) carrying out heat treatment on the precursor in the step (2) to obtain the composite ceramic ball. The composite ceramic ball has the characteristics of high particle sphericity, moderate size, low density, high mechanical strength and long service life, and can be used in a fluidized bed.
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Description

technical field

[0001] The invention relates to the technical field of chemical materials, in particular to a low-density composite ceramic ball used in a fluidized bed and a preparation method and application thereof. Background technique

[0002] In many industrial heat transfer processes, there is scaling on the tube wall of the heat exchanger, which leads to a decrease in the heat transfer coefficient and an increase in the pressure drop. Adding suitable inert solid particles into the heat exchanger and making them fluidized uniformly can enhance heat transfer and prevent and remove scale.

[0003] The solid particles currently used in heat exchangers are deficient to varying degrees. For example, the density of corundum ball is high, and its fluidization is uneven and the circulation is difficult when operating at low flow rate; the wear resistance of engineering plastic particles is poor, resulting in short life and high operating cost; quartz sand has high hardness a...

Claims

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