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在加热设备中利用透气、耐热固体使烟气对被加热件的辐射传热变换为固体的辐射传热,可提高加热炉的辐射传热效率。目前日本工业上出现了一种陶瓷泡沫可用作上述要求的透气性固体,经实践使用获得了良好的节约燃料的效果。一、陶瓷泡沫的主要特点: 1.气孔率高达80～90％,所以对气体的阻力很小。 2.由于骨架的尺寸很小,对流传热系数非常高。 3.和气体的接触面积(即传热面积)极
In the heating equipment using breathable, heat-resistant solid flue gas on the heated parts of the radiation heat transfer conversion of solid heat transfer can improve the heating furnace radiation heat transfer efficiency. At present there is a Japanese industry appears ceramic foam can be used as the above requirements of the air-permeable solid, through practical use to obtain a good fuel-saving effect. First, the main features of ceramic foam: 1. Porosity up to 80 to 90%, so the resistance to gas is small. 2. Due to the small size of the skeleton, convection heat transfer coefficient is very high. 3. And gas contact area (ie heat transfer area) pole