Method and device for quickly heating Al2O3
A technology of rapid heating and auxiliary electric field, applied in the direction of microwave heating, etc., can solve the problems of complex process, mixing of weak absorbing materials, large energy loss, etc., and achieve the effect of simple operation, expanded industrial application, and high degree of intelligence
Inactive Publication Date: 2015-09-09
KUNMING UNIV OF SCI & TECH
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[0010] As can be seen from the above description, the disadvantages of using microwave-assisted heating: 1. The process is relatively complicated; 2. The energy loss is large, and it is necessary to do useless work to heat the strong absorbing material, which is not energy-saving enough; 3. The weak absorbing material is easily separated from the Strong absorbing substances are mixed, and new impurities may be generated
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[0036] The present invention will be further described below in combination with the accompanying drawings and specific embodiments.
[0037] Firstly, starting from the microstructure of matter, the microwave absorption characteristics of different molecules and the principle of microwave heating are described. In the microwave field, dielectrics can generally be divided into non-polar dielectrics, weakly polar dielectrics, and polar dielectrics with large electric dipole moments. The non-polar dielectric is composed of non-polar molecules. When there is no electric field, the molecules or atoms that make up the dielectric, in which the center of the positive charge of the nucleus coincides with the center of the negative charge of the electrons distributed around the nucleus, and is neutral to the outside. Because there is no electric dipole moment, the electric field in the microwave field can not produce a resultant external force and moment when it acts on it, and the mole...
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The invention relates to a method and a device for quickly heating Al2O3. Al2O3 is a weak microwave-absorbing material, the heating rate of Al2O3 is low by adopting a direct microwave heating method and device when the temperature is less than 800 DEG C, Al2O3 easily absorbs microwave and can be directly heated with microwave when the temperature is more than 800 DEG C, and according to the characteristic of Al2O3, the method and the device have the characteristics that an auxiliary electric field generating circuit and an intelligent temperature control circuit are adopted, the auxiliary electric field generating circuit consists of an auxiliary electric field control circuit and positive and negative metal electrode plates, and the intelligent temperature control circuit consists of a temperature measuring device and an intelligent switch. The auxiliary electric field generating circuit generates an auxiliary electric field in a microwave energy applicator to achieve the effect of polarizing Al2O3 molecules; the electric dipole moment of the polarized Al2O3 molecules is increased, so that the Al2O3 molecules can be quickly heated by microwave generated by a microwave generator; the temperature measuring device monitors the temperature of Al2O3 in the microwave energy applicator in real time; and when the temperature is more than 800 DEG C, the intelligent switch automatically turns off the auxiliary electric field. The method and the device, which can be used for directly and quickly heating Al2O3, are energy-saving and environment-friendly.
Description
technical field [0001] The invention relates to a rapid heating Al 2 o 3 The disclosed method and device belong to the field of microwave heating. Background technique [0002] Microwave heating is a new heating method, which has the advantages of internal heating, fast heating, clean and hygienic, easy automatic control, and energy saving. However, due to the selective heating characteristics of microwave, the heating speed of weak absorbing substances is slow, which limits the heating treatment of these substances by microwave technology. [0003] Al 2 o 3 It is a substance that absorbs microwaves weakly. When it is heated with microwaves at a certain power for 4.5 minutes, the temperature only rises to 78°C, while Fe, a substance that strongly absorbs microwaves, 3 o 4 The temperature was as high as 1258°C after only 2.75 minutes of microwave heating [1]. Therefore, in the microwave industry, the current Al 2 o 3 Only auxiliary heating can be used. [0004] The...
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IPC IPC(8): H05B6/64H05B6/80H05B6/68
Inventor 彭金辉刘秉国何广军张利波梁贵安李世伟刘明
Owner KUNMING UNIV OF SCI & TECH