System and method for continuously preparing carbon nano tube fibers based on floating catalytic CVD method

Abstract

The invention discloses a system and a method for continuously preparing carbon nano tube fibers based on a floating catalytic CVD method. The system includes a gasification and sample feeding device,a synthetic reaction device and a fiber winding collection device, wherein the gasification and sample feeding device includes a gasification cavity and a first heating device; the first heating device is used for heating the gasification cavity; and the gasification cavity is provided with a carbon source injection hole and a first carrier gas input hole. According to the system provided by theinvention, a liquid carbon source / catalyst can be gasified into a gaseous state in advance, and the feeding speed, gasification temperature, flow rate of a carrier gas and temperature of a conveying pipeline of the liquid carbon source / catalyst can be accurately controlled, so that the liquid carbon source / catalyst is fully and uniformly mixed with the carrier gas before entering a reaction area of the synthetic reaction device, a uniform, stable and continuous gaseous carbon source supply with the accurate and controllable speed is provided for subsequent growth of a carbon nano tube.

Description

technical field [0001] The invention relates to a system for preparing carbon nanotube fibers, in particular to a system and method for continuously preparing carbon nanotube fibers based on a floating catalytic CVD method, and belongs to the technical field of fiber synthesis. Background technique [0002] The floating catalytic CVD method is one of the most important preparation methods for continuous preparation of carbon nanotube fibers, which mainly includes a carbon source / catalyst continuous supply system, a high-temperature reaction furnace body, and a continuous collection system for carbon nanotube fibers. Among them, the carbon source / catalyst continuous supply system has a key influence on the quality of carbon nanotube fiber products. [0003] In the prior art, the liquid carbon source / catalyst supply device for preparing carbon nanotube fibers based on the floating catalytic CVD method mainly includes two types: 1) directly inject the liquid carbon source / catal...

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Problems solved by technology

[0003] In the prior art, the liquid carbon source / catalyst supply device for preparing carbon nanotube fibers based on the floating catalytic CVD method mainly includes two types: 1) directly inject the liquid carbon source / catalyst solution into one end of the high-temperature growth furnace, and carry out the process through the thermal radiation of the growth area. Gasification; 2) Ultrasonic atomization is used to assist sample injection. The ultrasonic atomization nozzle is located at one end of the growth furnace, and the liquid carbon source / catalyst solution can be atomized into micron-scale droplets first, and the droplets are radiated by the thermal radiation of the growth area to complete the process. gasification process; however, if the liquid carbon source / catalyst solution is directly injected into one end of the high-temperature growth furnace, since the liquid carbon source / catalyst is dripped into the high-temperature area for evaporation, and the evaporation process of the droplets is not continuous and uniform, so As a result, the supply of carbon source and catalyst is not uniform and continuous; in addition, when ultrasonic atomization is used to assist sampling, the liquid carbon source / catalyst is first atomized into micron droplets by the ultrasonic atomization device, and then enters the high temperature zone for gasification , in the ultrasonic atomization process, due to the heating effect of ultrasound, it is easy to form bubbles in the liquid, especially the commonly used low-boiling point carbon sources such as ethanol and acetone, which will cause intermittent pauses in the ultrasonic atomization process, resulting in carbon sources and The supply of catalyst is unstable, which will eventually affect the continuity and uniformity of the prepared carbon nanotube fibers

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