A powder microwave heating device and its application method

Abstract

A powder microwave heating device comprises a spiral pushing device and a heating bin, wherein the heating bin is of a closed tubular structure and composed of an inner pipe (6) and an outer pipe (10); the spiral pushing device comprises a forming conical sleeve (5) of a tubular structure, one end of the forming conical sleeve (5) is closed, a discharging outlet of a powder bin (2) is connected with a feeding inlet in the side wall of the forming conical sleeve (5), a spiral push rod (4) arranged in an inner cavity of the forming conical sleeve is arranged below the feeding inlet in the side wall of the forming conical sleeve, a shaft of the spiral push rod (4) penetrates through the closed end of the forming conical sleeve (5) to be connected with a motor, and the spiral pushing device is formed. The powder microwave heating device is simple in structure, convenient to operate and wide in universality.

Description

technical field [0001] The invention relates to the field of microwave heating of powder, in particular to a microwave heating device for powder and a method for using the same. Background technique [0002] The traditional heating method of powder is to burn fuel, resistance heating, etc. as the heat source. The heat energy obtained by the powder is increased by radiation and conduction heat transfer. The heat transfer and temperature rise of the powder are from the surface to the inside, and the heating is slow and The thermal efficiency is not high, and there is a temperature difference between the core and the surface. [0003] Microwave heating is a microwave source that applies an alternating external electric field to the heating powder. The microwave frequencies used for industrial heating are mainly 915MHz and 2450MHz. The polar molecules in the powder swing at such frequencies within one second to generate heat energy. is huge, the higher the frequency of the appl...

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Problems solved by technology

Household microwave ovens are the main application in life, and generally low-power magnetrons can meet the requirements; industrial applications require large heating power. The current solution is: use high-power magnetrons, but due to high-power magnetrons It is very difficult to manufacture the tubes and the price is very expensive; the second is to increase the number of low-power magnetrons to increase the total power of the heating equipment, which also brings new problems: since the microwave sources generated by each magnetron are almost impossible to achieve the same phase, Power accumulation and superposition cannot be effectively achieved. On the contrary, the aging of the magnetron is accelerated due to the mutual irradiation between the magnetrons, and there are many restrictions on the volume and shape of the heating object due to the limited microwave penetration depth.

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