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Coal Drying Induced by Cold Plasma

A plasma and low-temperature plasma technology, which is applied in coal drying, dehydration drying, and lignite drying, can solve the problems of complex equipment, insufficient lignite dehydration, and high energy consumption, and achieve fast drying speed, easy operation, and high dehydration rate. high effect

Inactive Publication Date: 2017-07-11
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to propose a method of using cold plasma to trigger coal drying in view of the shortcomings of the existing lignite drying technology, such as complex equipment, high energy consumption, and insufficient lignite dehydration.

Method used

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  • Coal Drying Induced by Cold Plasma
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  • Coal Drying Induced by Cold Plasma

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Grind lignite into coal powder with a fineness of more than 200 meshes, and then add the coal powder into the flat dielectric barrier discharge reaction chamber, such as figure 1 shown. Argon gas was introduced into the reaction chamber to isolate the air, and the flow rate of argon gas was 50 mL / min. A 7000V alternating current was applied between the two electrodes by a high-voltage power supply, and the current frequency was 8kHz. The processing time is 6min, 9min, 15min, 30min etc.

[0029] After the treatment process, the water content of lignite samples with different treatment time was analyzed, as shown in figure 2 shown. With the increase of processing time, the moisture in the lignite is gradually removed, and the moisture content of the lignite sample with a moisture content of about 25% is about 5% after 30 minutes of plasma drying.

Embodiment 2

[0031] The lignite is ground into pulverized coal with a fineness of 20 mesh, 40 mesh, 60 mesh, 100 mesh and 200 mesh respectively, and then the pulverized coal is added into the flat dielectric barrier discharge reaction chamber. Argon gas was introduced into the reaction chamber to isolate the air, and the flow rate of argon gas was 10 mL / min. A 7000V alternating current was applied between the two electrodes by a high-voltage power supply, and the current frequency was 8kHz. The processing time is 30min.

[0032] After the treatment process, the water content of the lignite samples with different particle sizes was analyzed, such as image 3 shown. It can be seen that this method has a good dehydration effect for lignite samples of different particle sizes.

Embodiment 3

[0034] Grind the gas coal into 200-mesh coal powder and add it to the flat dielectric barrier discharge reaction chamber. Helium was introduced into the reaction chamber to isolate the air, and the flow rate of helium was 10mL / min. A high-voltage power supply is used to apply 20000V alternating current between the two electrodes, and the current frequency is 8kHz. The processing time is 5 minutes.

[0035] After the treatment process, it was found that the plasma treatment process had a good dehydration effect on the gas-coal sample.

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Abstract

The invention relates to a method for utilizing cold plasma to trigger coal drying. The method comprises the following steps of milling raw coal into particles or powder with granularity of 20-200 meshes; loading a coal sample in a plasma reaction cavity; sending air or incombustible gas and gas mixture into the reaction cavity; at the atmosphere pressure, applying 5000-20000V alternating current voltage to the two ends of an electrode by a high-voltage power source, utilizing 30-100W input power to enable the gas to discharge electricity, and maintaining for 5-30 minutes, so as to realize the purpose of utilizing the plasma to trigger the coal sample drying process. The method has the advantages that the gas is triggered to discharge electricity by the plasma discharging device; by utilizing the changed electric field and the actions of free radicals and free electrons produced by the plasma and the coal particles, the distribution of charges at the surface of the coal particle surface and in a hole passage is changed, the binding capability with water molecules is reduced, and the purposes of drying and dewatering are realized; compared with the prior art, the plasma drying process has the characteristics of high dewatering rate, high drying speed, environment friendliness and the like.

Description

technical field [0001] The invention relates to a drying method for coal, especially for lignite with high water content. It belongs to the technical field of coal processing, in particular a method for rapid and efficient dehydration and drying of coal induced by cold plasma. Background technique [0002] Lignite is a coal with a relatively low degree of coalification. It has large reserves worldwide and is easy to mine. However, due to the high moisture and ash content in lignite, its utilization in production has been greatly affected. First of all, lignite is easy to weather and fragment in the air, and has a low ignition point. It is easy to spontaneously ignite when stored in large quantities for a long time, so it is not convenient for storage. At the same time, high moisture has led to increased transportation costs, especially in northern regions where it is prone to freezing and difficult to load and unload. In addition, high moisture also causes the problem of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F26B23/08
Inventor 周昕瞳刘昌俊
Owner TIANJIN UNIV
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