A Fluidized Bed for Batch Preparation of Carbon Nanotubes Based on Chemical Vapor Deposition

Abstract

The invention discloses a fluidized bed for preparing carbon nanotubes in batches based on a chemical vapor deposition method. device and heating device, cyclone separator, solid collection device and purification treatment device; the present invention mixes the gas evenly through the flow meter and the static gas mixing chamber, passes through the upper ventilation, and the gas passes through the double-layer pipe; it ensures that the gas passed into the growth The temperature in the cavity is constant, and the structural design of the porous ceramic mesh solves the problem of uniform air intake, making the thermal field and flow field of the growth cavity stable, ensuring high-quality and repeatable carbon nanotubes; the growth of carbon nanotubes is the fastest The most difficult thing to control is the mutual influence of the temperature difference between the gas field and the flow field. Due to too many variables, the shape of the grown carbon nanotubes cannot be guaranteed to be consistent, so the quality is very low. This solution completely solves the mutual influence of the gas field, flow field and temperature variables .

Description

technical field [0001] The invention belongs to the field of fluidized beds, and relates to a chemical vapor deposition method, in particular to a fluidized bed for preparing carbon nanotubes in batches based on the chemical vapor deposition method. Background technique [0002] Due to its excellent electrical, mechanical and thermal properties, carbon nanotubes have good application prospects in the fields of hydrogen storage, field emission, microwave absorption, electrode materials and so on. However, at present, many methods can only prepare carbon nanotubes in small batches, and it is difficult to reduce the cost, which seriously restricts its industrial application. Therefore, the large-scale controllable preparation of carbon nanotubes is a hot spot in the field of carbon nanotube research. [0003] The fluidized bed-chemical vapor deposition method has a large output and a high purity, and it is possible to realize large-scale continuous production. Since the chemi...

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Problems solved by technology

[0004] The fluidized bed method uses airflow to achieve continuous operation. The commonly used fluidized bed equipment cannot uniformly fluidize the catalyst with a certain particle size distribution, thereby affecting the activity of the catalyst and the yield of carbon nanotubes.

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