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Device for preparing nanocarbon through methane plasma cracking and method thereof

A plasma and nano-carbon technology, applied in the fields of nano-carbon, sustainable manufacturing/processing, climate sustainability, etc., can solve the problem of low utilization rate of terminal exhaust gas, incomplete carbon nano-capture, and low yield of nano-carbon particles and other problems to achieve the effect of avoiding harmful gas emissions, improving decomposition efficiency and reducing energy consumption

Active Publication Date: 2021-08-13
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the existing methods for preparing nanocarbons from plasma organic compounds, there are the following problems: (1) The carbon deposition in the reactor is serious. May deposit directly in the reactor and on the electrodes
(2) The problem of low yield of nano-carbon particles. In the collection of nano-carbons prepared by plasma organic matter, there are cyclone separators, ash hoppers, bag filters, etc., and the capture of carbon nano-particles by these methods is usually incomplete.
(3) The utilization rate of terminal exhaust gas is low, and the gas by-products are directly discharged into the atmosphere, which does not use its value and pollutes the environment

Method used

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  • Device for preparing nanocarbon through methane plasma cracking and method thereof
  • Device for preparing nanocarbon through methane plasma cracking and method thereof
  • Device for preparing nanocarbon through methane plasma cracking and method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A device for preparing nano-carbon by plasma cracking of methane, see Figure 1-4 , including a raw gas inlet pipe, a mixed tubular heat exchanger 1, a plasma reactor 2, a high temperature tubular heat exchanger 3, a particle trap 4 and a combustion chamber 5 connected by pipelines in sequence, and the raw gas is methane and A mixture of background gases, the feed gas inlet pipe includes a methane inlet pipe and a background gas inlet pipe that are communicated.

[0036] The raw gas enters the mixing tube heat exchanger 1 for mixing and heating. The mixed tubular heat exchanger 1 includes a static mixer and a tubular heat exchanger connected in series, the raw material gas is connected to the inlet of the static mixer, and the outlet of the static mixer is cooled with the tubular heat exchanger. The raw gas inlet is connected, the cold raw gas outlet of the tubular heat exchanger is connected to the inlet of the plasma reactor 2, and the hot flue gas inlet of the tubul...

Embodiment 2

[0047] Same as Example 1, the difference is that the electrocoagulation and electrostatic trapping device includes two reaction electrodes, an electrostatic trapping chamber, a dust collecting plate and a sampling chamber. There are two holes at the top of the cavity wall of the collecting cavity. The two reaction electrodes are parallel and symmetrically inserted into the cavity wall holes and protrude into the cavity wall. The two reaction electrodes are positive and negative. ~50kV high-voltage electricity, the dust collecting plate is arranged at the bottom end of the electrostatic capture chamber and corresponds to the cavity wall hole for collecting carbon nanoparticles, and the sampling chamber is arranged below the dust collecting plate for storage Carbon nanoparticles on the surface of the dust collector.

[0048] The reaction electrode is a stainless steel needle electrode with a length of 8 mm and a diameter of 0.5 mm. The two reaction electrodes are parallel and sy...

Embodiment 3

[0054] The same as Example 2, the difference is that each group of nozzle-type electrode groups in the plasma reactor 2 includes 3 groups of parallel stainless steel nozzles, the outer diameter of each group of stainless steel pipes is 2 mm, the thickness is 0.2 mm, and the The vertical distance is 9 mm, the horizontal distance between the two opposite sets of stainless steel nozzles is 15 mm, the flow rate of methane and argon is 3 L / min, the methane concentration is 10%, and the discharge voltage of the positive reaction electrode is 40 kV. At this time, the conversion rate of methane reaches 15%, and the H 2 The selectivity reaches 40%.

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Abstract

The invention discloses a device for preparing nanocarbon through methane plasma cracking and a method thereof, and belongs to the technical field of nanocarbon preparation. The device comprises a feed gas inlet pipe, a mixing tubular heat exchanger, a plasma reactor, a high-temperature tubular heat exchanger, a particle trap and a combustion chamber which are sequentially connected through pipelines. The methane and background gas are mixed and heated in a mixing tube type heat exchanger and then are introduced into a plasma reactor to be ionized to form high-temperature plasma jet flow, at the moment, the methane component is dehydrogenated at high temperature to form nano carbon particles, and after heat exchange and cooling, waste gas passes through an electrostatic particle trap and a bag type trap to obtain nano carbon. Finally, the waste gas with particles removed enters a combustion chamber to be fully combusted, and combustion flue gas is introduced into a mixed tubular heat exchanger to utilize heat of the combustion flue gas. The two-stage heat exchanger in the reactor is arranged for fully utilizing heat, so that the energy utilization efficiency is improved, and the energy consumption is reduced. The device and the method can avoid emission of harmful gases, and has the advantages of high nanocarbon yield, high decomposition efficiency and the like.

Description

technical field [0001] The invention relates to the technical field of preparation of nano-carbon, in particular to a device and method for preparing nano-carbon by plasma cracking of methane. Background technique [0002] At present, the methods of preparing nano-carbon materials using carbon sources include chemical vapor deposition, arc plasma, and laser ablation. Among them, the plasma method is considered to be one of the effective methods for producing nanocarbon materials due to its advantages of energy saving, high conversion rate of raw materials, no pollution, and simple process. In this method, organic compounds containing unsaturated chemical bonds with relatively active chemical properties such as ethylene, acetylene, styrene, benzene, toluene, and methane are used as carbon sources; stable gases such as argon, helium, nitrogen or hydrogen are used as carrier gases. . Through the arc discharge between the two electrodes, high-energy electrons and high temper...

Claims

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Application Information

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IPC IPC(8): C01B32/15
CPCC01B32/15Y02P20/10
Inventor 吴祖良成雨莲姚水良李晶高尔豪王伟朱佳丽
Owner CHANGZHOU UNIV