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Infrared Heater Infrared Heating Principle
Jul 05, 2017

Infrared Heater Infrared heating principle

Infrared heating principle Many of the methods of industrial heating and drying, since the energy crisis, the world to improve energy efficiency and the development of energy diversification, have developed a variety of conservation and alternative energy technologies, radiation heating and drying due to the special nature of the method, Proved to be one of the most efficient heating and drying techniques, and is widely used to replace the traditional hot air heating and drying system. Radiation heating and drying, including infrared, ultraviolet, microwave / radio frequency, electron beam and laser, etc., where the infrared heating and drying is the use of electromagnetic radiation heat transfer principle, direct heat transfer to achieve the purpose of heating and drying objects, so as to avoid heating media Resulting in the loss of energy, while the infrared due to have easy to produce, good control and other characteristics, with rapid heating, drying time is short, improve productivity, product quality improvement and equipment space savings, etc. Infrared wavelength range of roughly 0.75nm to 1000nm , Because its wavelength is located in the red light wavelength (0.6nm to 0.75nm or so) named after the outside. In the conventional industrial thermal range below 2000 ° C, infrared is the most important heat ray. People sometimes divided into infrared, "near infrared", "mid-infrared", "far infrared" and other small interval, the so-called far, medium and near, refers to its electromagnetic spectrum in the distance from the red light in terms of distance The

  The use of infrared heating is effective, mainly depends on the degree of absorption of heated objects, the higher the absorption rate, the better the effect of infrared radiation. And the absorption rate depends on the type of heating material, the surface state, the wavelength of the infrared radiation source. The ratio of the radiant energy to the incident energy of the object is called the reflectivity, and the reflectance of the different materials and the different surface conditions varies. The ratio of the radiant energy to the incident energy is called the transmittance, and the transmittance varies with the nature and thickness of the material. The effective penetration of different materials is not the same. The penetration of opaque materials is usually treated as zero. General metal crystals are very dense, through the surface of the electromagnetic radiation can be quickly attenuated in a very short distance, so the penetration of heat on the metal depth in the order of microns. And non-metallic materials are not very dense molecular structure, at different temperatures at different temperatures with different characteristics of the vibration frequency, so when the incident electromagnetic waves reach the interface, the electromagnetic waves are rarely reflected, easier to pass through the interface into the surface, some resonance Into the heat, and some can not stimulate the resonance is subject to refraction, scattering and reflection. Because the actual object is not a single structure of the simple material, so some of the radiation is not absorbed by the surface, in the process of deep will be the resonance of other substances to varying degrees to be absorbed. Only through the full thickness, the part of the radiation energy that is not absorbed can pass through. So the penetration of non-metallic depth is higher than the metal. Infrared heating advantages and efficiency, infrared drying and heating methods in recent years at an alarming pace of development was accepted, and was actually used in all levels, mainly infrared drying methods have the following advantages: 1. With penetration, Inside and outside at the same time heating. 2. No heat transfer media, good thermal efficiency. 3. Can be local heating, saving energy. 4. Provide a comfortable operating environment. 5. Save the furnace construction costs and space, combination, installation and maintenance is simple and easy. 6. Clean the heating process. 7. Temperature control is easy, and the temperature is fast, and more security. 8. Thermal inertia is small, do not need warm up, save manpower. Since the infrared heating has the above advantages, it is possible to obtain a high-quality product because of the high efficiency and uniform heating.

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