Preparation method of microporous ceramic gas distribution plate for high temperature fluidized bed reaction

Abstract

The invention discloses a method for preparing a microporous ceramic gas distribution plate for high-temperature fluidized bed reaction. The slurry composition for preparing the microporous ceramic gas distribution plate is as follows: 30 to 50 SiC particles with a particle diameter of 250 to 350 microns %, 1000 mesh SiC powder is 3-5%, Al2O3 is 3.0-5.0%, SiO2 is 1.0-2.0%, CaCO3 is 2.0-5.0% and Mg(OH)2 is 2.0-5.0%, potato flour is 1.0-5.0% % and the rest are mixed with ion-exchanged water to make a slurry, ball milled for 10-24 hours at 20-30°C, pour the obtained slurry into a plaster mold with sawtooth conical shape at one end and a flat surface at the other end, and then dry. The microporous ceramic gas distribution plate waste material obtained by demoulding and drying the plaster mold is a sawtooth cone-shaped cone on one side and a plane on the other end. It is sintered at 1350° C. to 1500° C. for 4-6 hours, and then cooled naturally to obtain a microporous ceramic gas distribution plate for high-temperature fluidized bed reaction with an overall porosity of 50-70%.

Description

technical field [0001] The invention relates to the field of ceramics, and provides a method for preparing a microporous ceramic gas distribution plate for high-temperature fluidized bed reaction. Background technique [0002] The gas distribution plate is an important component in the fluidized bed. In order to distribute the gas evenly through the distribution plate and stabilize the operation of the fluidized bed, the distribution plate must have a certain resistance. The design and manufacture of the gas distribution plate are directly related to whether the fluidized bed can operate normally. A good gas distribution plate needs to meet the requirements of good gas distribution state, small resistance, no material leakage, no clogging, simple structure, and convenient manufacturing and maintenance. For the multi-layer fluidized bed with overflow pipe and the gas distribution plate of the fluidized catalytic cracking unit, in addition to meeting the above requirements, i...

AI Technical Summary

Problems solved by technology

Traditional gas distribution plates are mainly used in catalytic or non-catalytic processes in the chemical industry, coal gasification or coal combustion processes. At this stage, fluidized bed technology is used to produce solar-grade polysilicon. Due to the requirements of polysilicon purity and yield, The above-mentioned gas distribution plate is not suitable for the production of solar-grade polysilicon particles. Generally, quartz powder is used to make the gas distribution plate. The distribution of pores is uneven, the resistance is large, and the distribution of reaction materials is poor, which affects the yield of polysilicon.

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