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工业窑炉,通常是工作在1000℃以上的高温,炉体耐火材料不仅起到工作空间的隔离结构作用,而且直接参与热交换过程。历来对耐火材料的要求都只侧重于绝热性能、耐火度、结构强度以及热惯性等方面,往往忽略了热辐射性能和红外波在其中传播、穿透、吸收和色散特性对炉体热效率的影响。随着近代光子传热、电子传热和声子传热理论的发展及目前能源形势对加热炉热效率的要求,故对耐火炉衬的作用做进一步的探讨。一、窑炉耐火材料的弱点 1、窑炉耐火材料在1～5微米红外波段的热辐射率太低,对高温辐射加热不利。图1所示的是用粘土料、粘土浇注料和高
Industrial kilns, usually working at high temperatures above 1000 ° C, not only serve as a refractory to the work space, but also directly participate in the heat exchange process. Historically, the requirements of refractory materials have focused on thermal insulation properties, refractoriness, structural strength and thermal inertia, etc., often neglecting the influence of thermal radiation and the propagation, penetration, absorption and dispersion characteristics of infrared waves on the furnace thermal efficiency . With the development of modern photon heat transfer, electron heat transfer and phonon heat transfer theory and the current energy situation on the thermal efficiency of the heating furnace, so the role of refractory lining to do further discussion. First, the weaknesses of refractory kiln 1, kiln refractories in the 1 ~ 5 micron infrared band emissivity is too low, high temperature radiation heating disadvantageous. Figure 1 shows the use of clay material, clay castable and high