以SiC和CuO为填料的硅酸盐基高发射率涂层制备与节能性能

Preparation and Energy Saving Performance of Silicate Based High Emissivity Coating with SiC and CuO as Fillers

工业窑炉的耗能占到我国能源总消耗的三成,占到工业能源消耗的六成。但窑炉的热效率较低,仅为30%左右,急需找到提升热效率的解决方案。在本研究中,以高发射率粉体碳化硅、氧化铜为填料,同时采用硅酸钠作为粘结剂,在莫来石纤维棉砖基体上通过刷涂方法制备了高发射涂层,并对其进行节能考核。结果表明,氧化铜涂层的发射率稳定在0.87以上,碳化硅涂层发射率稳定在0.89以上。不仅如此,莫来石纤维棉砖表面制备的涂层均有缩短升温时间、降低能耗的作用。其中碳化硅-硅酸钠涂层将升温时间缩短了2.29%,保温5h节能约7.69%;氧化铜-硅酸钠涂层将升温时间缩短了2.86%,保温5h节能约8.16%。该研究为窑炉节能提供了新的涂层方案,具有较好的应用前景。

The energy consumption of industrial kilns accounts for 30%of total energy consumption and 60%of industrial energy consumption in China.However,the thermal efficiency of the kiln is as low as about 30%.It is urgent to find solutions to improve the thermal efficiency.In this study,using high emissivity powders silicon carbide,copper oxide as fillers,and sodium silicate as binder,a high emissivity coating was prepared on the mullite light cotton brick matrix by brush coating method,and its energy saving assessment was tested.The results show that the emissivity of CuO coating is stable above 0.87,and that of SiC coating is stable above 0.89.Besides,the coating prepared on the surface of mullite fiber cotton brick can shorten the heating time and decrease energy consumption.The silicon carbide-sodium silicate coating can shorten the heating time by 4.2%,and save energy by 5.7%after holding for 5 hours.The copper oxide-sodium silicate coating can shorten the heating time by 2.9%,and save energy by 6.4%after holding for 5 hours.This research provides a new coating method for energy saving of kiln,and has a good application prospect.