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

Active Publication Date: 2022-07-22
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, corundum balls have a high density, and when operating at low flow rates, their fluidization is uneven and circulation is difficult; engineering plastic particles have poor wear resistance, resulting in short life and high operating costs; quartz sand due to its high hardness and Irregular shape will cause harmful wear to the heat transfer tube wall; while glass beads have low strength and weak thermal shock resistance, and are easily broken during use

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0111] ZrO 2 / SiO 2 / Al 2 O 3 The preparation method of spherical composite ceramic ball is as follows:

[0112] (1) Weigh 16.5g of aluminum powder and 84mL of deionized water into a three-necked flask, and at the same time, stir vigorously to make it evenly dispersed in water in a constant temperature oil bath at 75°C for three minutes, at a rate of 8 drops per minute Drop into 58ml of 3mol / LAlCl 3 Solution (aluminum powder and AlCl 3 The molar ratio of 3.5) was reacted for 2 to 3 hours, and then the temperature of the oil bath was increased to 98 °C, and 5.25 ml of 2.5 mol / L ZrOCl was added at the same time. 2 The solution was slowly dropped into the flask, aluminum powder and AlCl 3 The sum of the molar amounts of ZrOCl 2 The molar ratio is 60:1, react with the remaining aluminum powder for 2 to 3 hours, then the mixture is stirred and reacted at 98 °C; finally, 4g of 20wt% silica sol (take 30wt% silicon The sol was diluted to 20 wt %, the same below), continuously ...

Embodiment 2

[0116] Spherical composite ceramic balls are prepared with reference to the method of Example 1, the difference is that in step (1), ZrOCl 2 The solution and the silica sol were added at the same time, specifically including: weighing 16.5 g of aluminum powder and 84 mL of deionized water into a three-necked flask, while vigorously stirring to make it evenly dispersed in water in a constant temperature oil bath at 75°C. After three minutes, drip 8ml of 3mol / L AlCl at a rate of 8 drops per minute 3 Solution (aluminum powder and AlCl 3 The molar ratio of 3.5) was reacted for 2 to 3 h; then the temperature of the oil bath was increased to 98 °C, and 5 ml of 2.5 mol / L ZrOCl was mixed at the same time. 2 The solution and 4 g of 20 wt % silica sol were slowly dropped into the flask and reacted at 98° C. for 10-12 h to obtain the silica-zirconium-alumina sol. The spherical composite particles obtained in this example, wherein the molar ratio of Zr, Si and Al is 1:1:60, which is den...

Embodiment 3

[0118] The spherical composite ceramic ball was prepared with reference to the method of Example 1, the difference was that in step (1), firstly adding silica sol to form a gel and then adding ZrOCl 2 The solution specifically includes: Weighing 16.5 g of aluminum powder and 84 mL of deionized water into a three-necked flask, while vigorously stirring to make it evenly dispersed in water in a constant temperature oil bath at 75°C. After three minutes, drop in 58ml of 3mol / L AlCl at a rate of 8 drops per minute 3 Solution (aluminum powder and AlCl 3 The molar ratio of 3.5) was reacted for 2 to 3 hours; then the temperature of the oil bath was increased to 98°C, and 4g of 20wt% silica sol was slowly dropped into the flask, aluminum powder and AlCl 3 The molar ratio of the sum of the molar amounts of ZrOCl to the silica sol was 60:1, and then the mixture was continuously stirred and reacted at 98 °C for 2 to 3 h; finally, 2.5 mol / L ZrOCl was added dropwise to the reactor. 2 Aft...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/624F28D13/00
CPCC04B35/10C04B35/624F28D13/00C04B2235/77C04B2235/96C04B2235/3418C04B2235/3244
Inventor 马红钦俞璐琦
Owner TIANJIN UNIV
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