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A device and method for converting methane using plasma

A plasma and methane technology, applied in chemical instruments and methods, inorganic chemistry, organic chemistry, etc., can solve problems such as inapplicable methane conversion, and achieve the effect of benefiting methane conversion, reducing costs and reducing energy consumption

Active Publication Date: 2018-07-31
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the aforementioned problems with dielectric barrier discharge, this unit is not suitable for methane conversion

Method used

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  • A device and method for converting methane using plasma
  • A device and method for converting methane using plasma
  • A device and method for converting methane using plasma

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] The multi-needle electrode array 1 adopts a single-needle electrode, the gap between the single-needle electrode and the lower metal base 6 is 4mm, the gas in the gas cylinder 11 is methane, and the gas flow rate is respectively set to 50ml / min, 100ml / min, and 150ml / min, 200ml / min, the working voltage is 20kV, the discharge frequency is 1000Hz, and the plasma discharge time is 10min. The plasma treats methane, collects methane cracking products, and the online measurement results of gas chromatography are as follows: figure 2 and image 3 shown. figure 2 Corresponding to the gaseous product yield and methane conversion percentage, the abscissa corresponds to the gas flow rate. figure 2 Indicates that the collected gaseous products are composed of H 2 、C 2 h 6 、C 2 h 4 and C 2 h 2 composition, in which the main product is H 2 and C 2 h 2 . The conversion rate and yield decreased with the increase of the gas flow rate. When the gas flow rate was 50ml / min, ...

Embodiment 2

[0058] The multi-needle electrode array 1 adopts a single-needle electrode, the gap between the single-needle electrode and the lower metal base 6 is 8mm, the gas in the gas cylinder 11 is methane, and the gas flow rate is set to 50ml / min, 100ml / min, and 150ml respectively / min, 200ml / min, the working voltage is 20kV, the discharge frequency is 1000Hz, and the plasma discharge time is 10min. The plasma treats methane, collects methane cracking products, and the online measurement results of gas chromatography are as follows: Figure 4 shown. Figure 4 The ordinate corresponds to the gaseous product yield and methane conversion percentage, and the abscissa corresponds to the gas flow rate. Depend on Figure 4 It can be seen that the collected gaseous products are composed of H 2 、C 2 h 6 、C 2 h 4 and C 2 h 2 composition, in which the main product is H 2 and C 2 h 2 . The conversion rate and yield decreased with the increase of the gas flow rate. When the gas flow ra...

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Abstract

The invention relates to a device and a method for converting methane by the aid of plasmas to produce high-grade energy such as hydrogen and ethylene. The device for converting the methane by the aid of the plasmas comprises a reaction cover. A gas inlet is formed in the top of the reaction cover, a gas outlet is formed in the bottom of the reaction cover, an upper metal base and a lower metal base are respectively arranged in the reaction cover, a multi-needle electrode array is fixed to the lower side of the upper metal base, needle points face downwardly, and an upper insulating base is arranged on the top of the upper metal base; the upper metal base is connected with a high-voltage end of a nanosecond pulse power source by a metal rod which penetrates the upper insulating base; a plurality of gas via holes are uniformly formed in the upper metal base and the upper insulating base; the lower metal base is a ground electrode, and a lower insulating base is arranged at the bottom of the lower metal base. The device and the method have the advantages that plasma discharge modes can be changed by the device, and the methane conversion efficiency and the product selectivity can be changed.

Description

technical field [0001] The invention relates to a device and method for methane conversion, in particular to a device and method for producing high-grade energy such as hydrogen and ethylene by using plasma to convert methane. Background technique [0002] Exploring new ways to convert methane to produce high-grade energy is currently a research hotspot in the field of clean energy utilization, and using discharge plasma technology is a new idea to realize methane conversion. A large number of high-energy electrons and active groups in the atmospheric pressure low-temperature plasma can effectively break the C-H bond in methane, realize methane conversion, and avoid the limitations of high temperature and other conditions required in traditional hydrogen production methods. [0003] Traditional plasma reforming methane devices include dielectric barrier discharge and sliding arc discharge, and a catalyst is used in combination in the reaction process. Due to the limitation ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B3/24C07C2/80C07C11/04
CPCC01B3/24C07C2/80C07C11/04
Inventor 王瑞雪高远邵涛张帅章程
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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