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Microwave is combined with traditional heating and drying technology
Apr 13, 2018

Combined with traditional heating and drying technology, microwave power applications are mainly used in heating, drying and food production. However, from the perspective of demand, microwave power application equipment has not been able to meet the needs of many fields. Due to the popularity of household microwave oven, many enterprises improve production intent has been made into feasibility test in the microwave oven, or have seen improved warning, need to further, but the existing microwave power devices and can never completely adapt to these requirements, that is to say, in terms of microwave drying, microwave power engineering there are still a lot of pioneering work to do. These areas generally is the high temperature processing of non-metallic materials, polymer heat styling, chemical materials, unique degree of dry dry, take off water of crystallization, glass fiber, various kinds of biological chemical material and food drying, vacuum drying in low temperature. Some areas are heated and dry, and traditional methods have done a lot of research. Drying methods, for example, focus on the different states in the most efficient way to channel water discharge, spray drying, fluidized bed drying, vibration fluidized bed drying, drying, vacuum drying room are all materials should be different status and hot air time points in contact and discharge water. If microwave energy is properly introduced, it is possible to accelerate the drying process and improve the drying quality. The microwave method in these fields is suitable to combine with the traditional method, and the deficiency of heat deficiency can be added to the materials, which can be heated by microwave. The method of dredging and discharging water should also adopt the advantages of the traditional method, which requires the reform of the original equipment in order to be compatible with the microwave power and the measures to prevent the leakage of microwave. Many materials of oven dry processing, non-metallic materials and heat treatment, application of large power of microwave equipment density is not high enough, the design of high field strength density device, has shied away from microwave power devices can improve heat treatment methods for non-metallic materials, estimated in theory, the oven dry processing of chemical material will obtain good effect. Unified power engineering method of electromagnetic field, in order to improve the production conditions, the progress of the work for cutting-edge research efforts from many reported literature, foreign radio frequency heating equipment its design method is proposed to gradually and close to the microwave power, the development of the so-called 50 Ω rf industrial heating technology, standard radio frequency equipment should be composed of four parts as follows:

(1) rf oscillator with 50 output impedance;

(2) connect the 50 coaxial axis of the rf oscillator and the matching box;

(3) a matching box with the control and discriminator discrimmatic;

(4) applicator. That is to say, the rf power equipment development direction is no longer a continuum, and can also be assembled from off-the-shelf equipment, and the oscillation source and application can according to need to distance (the f industrial equipment cannot meet the requirements). This method is consistent with the development of microwave power equipment. The method of assembling equipment according to standard parts. At the same time, the rf power output is to be switched to a crystal oscillator feed amplifier for stable frequency and control power. Such scheme and further improvement of microwave power source; By using the orthogonal field amplifier, the oscillation circuit composed of active microwave network is called stabilized lotron. The output power of the stabilized frequency tube is 10 -- 50KW and 10-100kw at 2450MHz. Typical Rf frequency is 13.56 MHz, 27.12 MHz and 40.68 MHz currently has a tendency to improve the use frequency, the manufacture of Klystron with 267 MHz as high power industrial application, and the application of microwave power frequency is 2450 MHz, 915 MHz, 434 MHz to development trend. From the perspective of device design, rf equipment and microwave equipment are gradually approaching, while microwave use frequency is expanding downwards, and the frequency of radio frequency is increasing. They extend up and down, and further into a unified electromagnetic power equipment, microwave power equipment and radio frequency power equipment is actually two leaves, electromagnetic power equipment should be electricity power use uniform magnetic field Angle to deal, rf and microwave each have expertise, each have shortcomings, should his element working on the, avoid the short, make the person of electromagnetic power equipment is done more reasonable, more practical. Microwave and radio frequency electromagnetic field power engineering field mainly heating drying, material handling and gas discharge, application is very wide, very close to the actual production, both the traditional heating drying method improvement, is the important tool of many important research method. At present, some general plans should be made on the basis of investigation and research. It is reasonable to have a weak link in which industries should be heated, and which technologies should be used in the electromagnetic field power equipment. At present, there are some problems in the research work of rf and microwave methods, and the weak links of equipment foundation. Should we step up infrastructure construction to effectively promote the research work on the frontier?


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