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长期以来,涂复辐射涂层被作为提高辐射能利用水平的一个重要手段。它常在下述两种情况下被利用:1)在红外加热器的辐射面上涂复高发射率涂层(或同时在其非辐射面上涂复低发射率涂层)。2)在火焰加热炉或电加热炉的炉膛内壁涂复高发射率涂层。我们认为,在加热炉的热源表面涂复高发射率涂层后,能起两种作用:提高热源的辐射强度(或同时改变其传导、对流与辐射传热的比例);改变热源的辐射能谱分布状况。但有人认为,依据能量守恒定律,在炉子处于封闭状态时,上述涂复红外辐射涂层的措施是没有任何实际价值的。还有人认为,在炉墙上涂复辐射涂层没有节能作用。鉴于上述不同认识,本文试对红外辐射涂层的作用机理作进一步探讨,并与有关同志讨论。
For a long time, coated radiation coating is used as an important means to improve the level of radiant energy utilization. It is often used in two situations: 1) Apply a high emissivity coating on the radiating surface of the IR heater (or at the same time apply a low emissivity coating to its non-radiating surface). 2) In the flame furnace or electric furnace hearth coating high emissivity coating. In our opinion, applying high emissivity coating on the heat source surface of a heating furnace can play two roles: increasing the radiation intensity of the heat source (or simultaneously changing the ratio of its conduction, convection and radiation heat transfer); changing the radiant energy of the heat source Spectrum distribution. However, some people think that, according to the law of conservation of energy, when the furnace is closed, the above measures of coating the infrared radiation coating have no practical value. Others think that there is no energy saving effect to coat the radiant coating on the furnace wall. In view of the above differences, this paper attempts to explore the mechanism of action of IR radiation coatings and discuss with the relevant comrades.