Method and device for preparing nano-powder by thermal cracking

A nano-powder, thermal cracking technology, applied in grain processing and other directions, can solve the problems of large equipment investment, slow steam production and large investment in steam mills, and achieve the effects of high energy utilization rate, high crushing intensity and low investment.

Pending Publication Date: 2021-09-21
韦可壮
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The water mill is an equipment that uses water as the medium to adjust the powder into a slurry for grinding. This equipment can produce nano-sized particles, but it adopts the multiple energy conversion method of "dry powder-slurry-dry powder", which makes the grinding process equipment Large investment, high energy consumption, low output, longer and more complicated process route
[0006] Jet mill is a device for grinding with compressed air as the medium. It needs to be combined with sorting and grading equipment during use. The result of jet milling can achieve finer product particle size; however, the energy utilization rate of the system is low, and the configuration required for air power The power of compressed air is large, the pressure increase is not high enough, the air at normal temperature and pressure or heated air has low enthalpy, small specific heat capacity, high energy consumption for preparing compressed air, large equipment investment, high failure rate, low production efficiency, low output, high production cost
[0007] The steam mill is a device for grinding with steam as the medium. The steam mill has the defects of slow steam production, low temperature, high energy consumption and large investment.

Method used

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  • Method and device for preparing nano-powder by thermal cracking
  • Method and device for preparing nano-powder by thermal cracking
  • Method and device for preparing nano-powder by thermal cracking

Examples

Experimental program
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Effect test

Embodiment 1

[0050] In order to solve various defects existing in the existing nano-powder processing equipment, the present invention provides a thermal cracking preparation device for nano-powder, such as figure 1 As shown, it includes: a superheated steam generator 1, a Laval jet device 2, and a pyrolysis reactor 3.

[0051] In this embodiment, the superheated steam generator 1 is used to generate superheated steam. Specifically, there is a heat medium in the superheated steam generator 1. The heat medium is heated by the heater 4 to store heat and energy. The heat medium The temperature of the medium can be heated to 400-650°C. The heater 4 is specifically a burner, and the natural gas is fed into the burner to burn, so as to heat the heat medium.

[0052] It should be noted that the heater 4 is not limited to the burner in this embodiment, and in other embodiments, heating methods such as electric heating can also be used.

[0053] In addition to the generator body, the superheated s...

Embodiment 2

[0068] A device for preparing nanopowders by pyrolysis, such as figure 2 As shown, different from Embodiment 1, this embodiment also includes a sorting mechanism.

[0069] In Example 1, the 500-2000 mesh (25-6.5 μm) powder can form 8000-12500 mesh (1.6-1.0 μm) nanoscale powder after the continuous pyrolysis pulverization reaction in the pyrolysis reactor 3. The sorting mechanism in the embodiment is for further sorting and screening the powder produced in the pyrolysis reactor 3 .

[0070] In this embodiment, the sorting mechanism includes: a cyclone separator 7 , a powder buffer bin 8 , a sorting pulse dust collector 9 and a sorting exhaust fan 10 .

[0071] Specifically, such as figure 2 As shown, the cyclone separator 7 is connected to the bottom of the thermal cracking reactor 3 for sorting and separating the powder products discharged from the thermal cracking reactor, and the powder buffer storehouse 8 is connected to the cyclone separator The bottom of the cyclone ...

Embodiment 3

[0076] The device for preparing nano-powder by pyrolysis is different from Example 2 in that this embodiment also includes a drying and depolymerization mechanism. For some powders with strong water absorption and prone to agglomeration, they can be further processed through the drying and depolymerization mechanism. .

[0077] In this embodiment, the drying and deaggregating mechanism includes a honeycomb mill 11, which is connected to the powder buffer bin 8 and the sorting pulse dust collector 9 respectively, and the powder in the powder buffer bin 8, the sorting The 1# nano-powder in the pulse dust collector 9 and the dispersant in the dispersant tank 12 are transported to the honeycomb mill 11 according to the metering ratio for drying, depolymerization, and modification. Carry out hot air delivery, that is, the honeycomb mill 11 of this embodiment communicates with the sorting exhaust fan 10 .

[0078] It should be noted that the dispersant tank 12 in this embodiment al...

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Abstract

The invention provides a method and a device for preparing nano-powder by thermal cracking, and belongs to the technical field of nano-powder preparation. According to the preparation method, an airflow mixture formed by powder and superheated steam is sprayed into a thermal cracking reactor by supersonic thrust, and continuous thermal cracking crushing is carried out on the powder through high-temperature and high-pressure superheated steam airflow. The preparation device comprises a superheated steam generator, a Laval jet device and a thermal cracking reactor, the superheated steam generator is used for generating superheated steam. The Laval jet device communicates with the superheated steam generator and is used for mixing and colliding superheated steam and powder to form a crushed airflow mixture. The thermal cracking reactor communicates with the Laval jet device, so that the airflow mixture ejected by the Laval jet device is subjected to a continuous thermal cracking crushing reaction. The method for preparing the nano-powder by thermal cracking has the advantages of high energy utilization rate and high crushing strength, and the preparation device has the advantages of low investment, low cost, high yield and good quality.

Description

technical field [0001] The invention belongs to the technical field of nanometer powder preparation, and in particular relates to a method for preparing nanometer powder by thermal cracking. In addition, the invention also relates to a device for preparing nanometer powder by thermal cracking. Background technique [0002] With the continuous development of modern industry and the wide application of new technologies and new materials, ultra-fine powders and micro-nano-scale powders continue to achieve innovation in plastics, papermaking, coatings, rubber, building materials, medicine, new energy and other related industries. Applications, powders of various specifications play a very important role in various application fields. [0003] Traditional powder processing equipment includes: Raymond machine, ball mill, vertical mill, vibration mill, ultrafine mill, water mill, jet mill, steam mill and other traditional grinding methods. At present, the powder particles processe...

Claims

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Application Information

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IPC IPC(8): B02C19/06B02C19/18B02C23/14
CPCB02C19/06B02C19/186B02C23/14
Inventor 韦可壮
Owner 韦可壮
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