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CN-122002658-A - Method for improving microwave efficiency

CN122002658ACN 122002658 ACN122002658 ACN 122002658ACN-122002658-A

Abstract

The application discloses a method for improving microwave efficiency, which comprises the steps of arranging a suspension impedance matching layer on the surface area of high-conductivity liquid in a microwave heating cavity, wherein the suspension impedance matching layer is formed by a plurality of discrete ceramic hollow spherical shells, the density of the ceramic hollow spherical shells is between that of air and high-conductivity liquid so as to suspend in the liquid, feeding microwaves into the microwave heating cavity, and the microwaves firstly propagate through the suspension impedance matching layer before reaching the surface of the high-conductivity liquid. According to the application, the efficiency of microwave heating is optimized from the impedance matching angle, and the ceramic spherical shell is added on the liquid level to form the matching layer with gradient dielectric constant, so that the efficient microwave heating of the high-conductivity liquid is realized, and the efficient microwave absorption can be still maintained when the load dielectric dynamic changes.

Inventors

  • ZHU HUACHENG
  • YANG YANG

Assignees

  • 四川大学

Dates

Publication Date
20260508
Application Date
20260209

Claims (10)

  1. 1. A method of improving microwave efficiency comprising: A suspension impedance matching layer is arranged on the surface area of the high-conductivity liquid in the microwave heating cavity, the suspension impedance matching layer is composed of a plurality of discrete ceramic hollow spherical shells, and the density of the ceramic hollow spherical shells is between that of air and the high-conductivity liquid, so that the ceramic hollow spherical shells are suspended in the liquid; feeding microwaves into the microwave heating cavity; The microwaves propagate through the suspended impedance matching layer before reaching the surface of the high-conductivity liquid.
  2. 2. The method of claim 1, wherein the plurality of ceramic hollow shells are arranged in a uniform array on the surface of the highly conductive liquid.
  3. 3. The method of claim 1, wherein the ceramic hollow spherical shell has an outer radius of 17mm and a wall thickness of 1mm.
  4. 4. A method of increasing microwave efficiency according to claim 3, wherein the ceramic hollow spherical shell has a density of 4.057g/cm 3 .
  5. 5. The method of increasing microwave efficiency according to claim 1, wherein the ceramic material comprising the ceramic hollow sphere has a relative dielectric constant of 44.9.
  6. 6. An apparatus for enhancing microwave efficiency for implementing the method of claim 1, comprising: A heating chamber for containing a highly conductive liquid to be treated; The feed port is arranged on the heating cavity and is used for feeding microwave energy into the heating cavity; And the suspension impedance matching structure is composed of a plurality of discrete ceramic hollow spherical shells and is configured to suspend in the surface area of the high-conductivity liquid in the heating cavity and used for forming an impedance gradient layer on a microwave propagation path.
  7. 7. The apparatus for increasing microwave efficiency according to claim 6, wherein the heating cavity comprises a cylindrical metal cavity body and a hemispherical metal dome connected to the cylindrical metal cavity body, the feed port being disposed on the hemispherical metal dome; the height of the cylindrical metal cavity is 225mm, the radius is 110mm, and the radius of the hemispherical metal dome is 110mm.
  8. 8. The apparatus for improving microwave efficiency according to claim 6, wherein the feed port is a standard BJ22 waveguide with an operating frequency of 2.45GHz.
  9. 9. An electronic device comprising a processor, a memory and a computer program stored on the memory and executable on the processor, the processor implementing the method of improving microwave efficiency of any one of claims 1 to 5 when the program is executed by the processor.
  10. 10. A computer readable storage medium, wherein a computer program is stored on the computer readable storage medium, which computer program, when executed by a processor, implements the method of improving microwave efficiency according to any one of claims 1 to 5.

Description

Method for improving microwave efficiency Technical Field The application relates to the field of microwave heating, in particular to a method for improving microwave efficiency. Background Along with the development of scientific technology, microwave energy is used as a novel efficient clean energy source, and is widely applied to various fields such as food processing, chemical industry, medicine and the like by virtue of the outstanding characteristics of high efficiency, energy conservation, selective heating, cleanness and no pollution. The microwave heating conductive liquid can be widely applied to links such as medicine synthesis, organic chemical detection and analysis, traditional Chinese medicine extraction and the like in the fields of chemical reaction, liquid-liquid phase reaction, catalytic reaction and the like, can realize rapid heating of food and maintain physical properties of the food in the aspect of food processing, can be used for preparing nano materials, porous materials and the like in material science, and has important application in the field of environmental protection. However, the conventional microwave heating system faces the key problems of high port reflection coefficient and low energy conversion rate when heating the high-conductivity solution. The core reason for this problem is that the relative dielectric constant of the heated liquid is usually much higher than that of air, so that serious impedance mismatch occurs at the interface between air and the heated sample, so that microwave energy is difficult to be absorbed efficiently, and the application effect of the microwave heating technology in a high-conductivity liquid heating scene is greatly limited. In order to solve the problems of microwave heating efficiency and stability, the prior art regulates and controls the transmission and coupling characteristics of microwaves through adding auxiliary structures, improving port design, optimizing feed and other ideas, and a plurality of related researches are carried out. The electromagnetic black hole auxiliary structure is added with a functional auxiliary structure, so that effective microwave convergence is realized through a multi-layer medium and equivalent dielectric constant design, high-efficiency microwave absorption of a load can be guaranteed even if the dielectric constant of the load changes in a large range, the metal ring resonance auxiliary structure can regulate and control electric field distribution and microwave energy action forms in a cavity, and the electromagnetic black hole auxiliary structure is suitable for high-efficiency heating of loads such as ethanol aqueous solution and liquid food in different proportions, but the structure has selectivity on heating samples, and ideal efficiency is difficult to achieve in low-dielectric load heating. The improved waveguide port design is a common mode for optimizing the microwave energy coupling efficiency, namely changing the microwave radiation mode by adjusting the action angle of the port, optimizing the heating time by combining an algorithm, further excavating the energy efficiency and improving the space, and specifically optimizing the waveguide port size of the heating cavity and matching the size parameters of a heated sample, so that the loss of microwave energy in the transmission and coupling processes can be effectively reduced, and a clear application effect is shown in the microwave heating of materials such as coal slime. The microwave heating uniformity and efficiency can be cooperatively optimized by adopting a heating strategy of self-adaptive regulation and control of the feed source, namely, by dynamically self-adaptive adjustment of the microwave resonant frequency, the feed frequency parameters are optimized in real time according to the cavity and load characteristics in the heating process, so that the distribution uniformity of an electric field in the cavity can be improved, and the high efficiency of microwave heating can be ensured. Although the prior art shows a certain effectiveness in a specific scene, the defects of high cost, complex system structure, strong dependence on load conditions and the like are common, the large-scale microwave heating requirement of the high-conductivity liquid is difficult to adapt, and the application of the high-conductivity liquid in industrial-level practical application is obviously limited. Disclosure of Invention In order to solve the problems, the application provides a method for improving microwave efficiency, which aims to solve the problems of high port reflection coefficient, low process energy conversion rate, complex heating system structure and the like of the traditional microwave heating system in the heating application of a high-conductivity liquid cavity. An embodiment of the present invention provides a method for improving microwave efficiency, including: A suspension impedance matching layer is arranged on th