Device and system for spheroidizing powder by using alternating-current plasmas

A technology of plasma and spheroidizing powder, which is applied in the direction of granulating raw materials, chemical/physical/physicochemical processes of energy application, chemical instruments and methods, etc., can solve problems such as product pollution and improve the spheroidization rate , high heat utilization rate, and easy industrial implementation

Active Publication Date: 2014-04-23
CHINA SHENHUA ENERGY CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a device and system for spheroidizing powders using AC plasma to solve the problem in the prior art that product contamination is easily caused by electrode evaporation when DC plasma is used

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  • Device and system for spheroidizing powder by using alternating-current plasmas
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  • Device and system for spheroidizing powder by using alternating-current plasmas

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Embodiment

[0042] Equipment for spheroidizing powder such as Figure 1-3 As shown, wherein, the side wall 13 of the discharge chamber is 50 cm high, and its inner diameter is 30 cm; the side wall 31 of the heat exchange chamber is 70 cm high, and its inner diameter is 50 cm. The raw material to be spheroidized is alumina produced by the alumina pilot plant of Shenhua Zhuneng Resource Development Co., Ltd. After grinding and crushing, the median particle size is 25 μm (see the SEM picture of Figure 5 ). Introduce argon as the working gas, the flow rate is 1.3m 3 / h, into the air as side air, the flow rate is 4.5m 3 / h, turn on the high-frequency power supply, the oscillation frequency is 4.0MHz, the plasma power is 40kW, a stable plasma is obtained after a few minutes, and the angular alumina powder is passed into the discharge chamber 1 through the powder feeding system, and the feeding speed is 10g / min , using high-frequency plasma for heating and melting, adjusting the temperature ...

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Abstract

The invention discloses a device for spheroidizing powder by using alternating-current plasmas. The device comprises a discharge chamber, an inductance coil and a heat exchange chamber, wherein the heat exchange chamber is communicated with the bottom of the discharge chamber; the discharge chamber comprises a roof cover, a powder feeding tube and a cylindrical discharge chamber side-wall, the powder feeding tube extends to the inside of the discharge chamber, and the inductance coil is wound on the cylindrical discharge chamber side-wall; the heat exchange chamber comprises a heat exchange chamber side-wall and a spherical powder outlet, and the spherical powder outlet is located at the bottom of the heat exchange chamber; a working gas inlet pipe is arranged in the discharge chamber, the discharge chamber side-wall is provided with a protective gas inlet pipe, and a cooling cavity is arranged in each of the roof cover, the discharge chamber side-wall and the heat exchange chamber side-wall. The invention also discloses a powder spheroidizing system comprising the device. According to the invention, irregularly-shaped powder is spheroidized by using alternating-current plasmas generated by the inductance coil, so that a mode of spheroidizing powder by using plasmas generated by electrode discharge in the prior art is changed, and the pollution of products caused by electrode evaporation is avoided.

Description

technical field [0001] The invention belongs to the field of powder spheroidization, and in particular relates to equipment and a system for spheroidizing oxygen powder by using AC plasma. Background technique [0002] Metal matrix composites can be basically divided into three categories: continuous fiber reinforcement, discontinuous body reinforcement and laminated composites. Among them, particle-reinforced metal matrix composites not only have the excellent properties of fiber and whisker reinforced materials, but also have the advantages of relatively simple preparation process, good material isotropy, and high wear resistance. It is an important branch of the research field of metal matrix composites. Al 2 o 3 As a commonly used particle reinforcement, it is widely used in many high-tech fields such as refractory materials, precision ceramics, and aerospace. It is a variety of high-value-added alumina. Experiments show that spherical Al 2 o 3 Particle-reinforced A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J19/08B01J2/00
Inventor 郭昭华高进王永旺杨磊王瑞池君洲董宏
Owner CHINA SHENHUA ENERGY CO LTD
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