Fluidized bed for preparing carbon nano tubes in batch based on chemical vapor deposition method

Abstract

The invention discloses a fluidized bed for preparing carbon nano tubes in batch based on a chemical vapor deposition method. The fluidized bed comprises an automatic liquid adding device, an ultrasonic atomization generation device, a gas supply device, a gas flow control device, a three temperature zone fluidized bed reactor and a heating device, a cyclone separator, a solid collection device and a purification treatment device; according to the fluidized bed for preparing the carbon nano tubes in batch based on the chemical vapor deposition method, gas is evenly mixed and stirred through aflowmeter and a static gas mixing chamber, through upper ventilation, the gas passes through a double-layered tube; it is ensured that the entered gas enters a growing cavity at the same temperature,through the structure design of a porous ceramic screen, the problem of the even air inflow is solved, a thermal filed and flow field of the growing cavity are stable, and it is ensured that the carbon nano tubes with high quality and good repeatability are obtained; the hardest thing to control on the growth of the carbon nano tubes is the interaction of the temperature difference between a gas filed and the flow field, because variables are too many, the consistency of the forms of the growing carbon nano tubes cannot be guaranteed, the quality of the carbon nano tubes is very low, and the fluidized bed completely solves the interaction among the gas field, the flow field and the temperature variable.

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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