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Application of far infrared radiation in agricultural production

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Update time : 2020-03-31 08:45:50
Far infrared radiation has a certain penetration force, which can penetrate into the interior of the object, accelerate the movement of its internal molecules, and make the object warm up. For this reason, far infrared radiation has a good thermal effect.

Far infrared radiation drying is to use the infrared radiation whose wavelength is more than 2.5 μ m to dry and process materials. It has been applied to the heating and drying of vegetables, aquatic products, wood, grain, paint, etc. Infrared radiation heating technology is also an efficient, energy-saving, low pollution drying technology.
Far infrared radiation (FIR) is a new drying technology. The mechanism is to use the far-infrared emission wavelength to match the absorption wavelength of the dried material, causing strong molecular vibration in the material, friction and heat generation to achieve the purpose of drying. The far-infrared materials with high emissivity can match the infrared spectrum of many materials, so the drying is faster and the energy utilization is high. Far infrared can selectively penetrate the material, improve the temperature below the surface of the material, and absorb far infrared at the same time, so the heating is relatively uniform, and the physical properties of the product, such as odor, are better.

The generation of far-infrared is related to the properties of materials. The common far-infrared materials are ceramics, metals, metal oxides, etc. The radiation ability of far infrared varies with the wavelength. Infrared is a kind of electromagnetic wave. Its wavelength is longer than red light and shorter than microwave. Its wavelength is 0.76 ~ 1000 μ M. According to the optical measurement, it can be divided into 0.76 ~ 4 μ m near infrared and 4 ~ 1000 μ m far infrared. According to the classification of industrial heating, the wavelength of far infrared is 6.0-15 μ m, while that of mid infrared is 2.5-6.0 μ m, and that of near infrared is 0.75-2.5 μ M. It is found that 8 ~ 14 μ m far infrared can selectively penetrate the surface of human skin. Because most of the objects can emit far-infrared, but the intensity is different, it is necessary to measure far-infrared. The common methods are as follows: power is measured by power meter, AE digital hemispherical emissivity tester, ir-2 dual band infrared emissivity tester and medium temperature normal emissivity tester are used to compare the emissivity measurement, portable far-infrared intensity tester is used to measure the intensity, spectrometer wavelength is used to measure the far-infrared wavelength, and X-ray diffraction is used The composition of far-infrared emission source materials was determined by diffraction, XRD and X-ray photoelectron spectroscopy (XPS). Far infrared effect can be adjusted and changed. By adjusting the pressure and distance, the far-infrared power can be changed. The emissivity can be changed by changing the material and temperature.

Most objects in nature can emit far-infrared, but the intensity is different. Therefore, it is necessary to apply far-infrared emission source to drying, and it is particularly important to determine its radiation characteristics. In this chapter, the radiation characteristics of far-infrared emitter are studied systematically, and a set of test methods are established, including power density, specific emissivity, heat distribution, wavelength, etc. This chapter mainly studies the influence of the type of far-infrared emission sources on the radiation intensity such as power density and specific emissivity, the influence of the number of far-infrared emission sources on the power density and heat distribution, the influence of temperature on the wavelength and power density of emission sources, and detects the maximum emission wavelength corresponding to this emission source, the influence of far-infrared wavelength on power density, and the influence of irradiation distance on power density, The influence of preheating time on drying rate, the influence of spatial distribution of emission sources on drying rate, power density and radiation distribution uniformity are expected to provide theoretical basis and basis for the application of far-infrared emission sources in spices and other foods.

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