高发射率红外辐射节能材料的制备及性能研究

Study on Preparation and Properties of Infrared Radiation Energy-Saving Materials with High Emissivity

将原料Fe_(2)O_(3)、Cr_(2)O_(3)、MnO_(2)、CuO、SiO_(2)、Al_(2)O_(3)按比例混合,在1200℃下经固相高温烧结制备成高温高发射率节能材料,再与粘结剂混合球磨制备高温高发射率节能涂料。通过扫描电子显微镜(SEM)、红外辐射测量仪对材料的微观结构和理化性能进行表征,结果表明,在400~700℃、2~14μm波段,制备的涂层样品的发射率随测量温度的升高逐渐增大;在测量温度为700℃时,测得样品的发射率最高达到0.94。采用热震法对涂层的抗热震性能进行了测试,结果表明,将涂层加热到1000℃进行水冷退热并反复循环操作50次,涂层未发现脱落,这说明涂层的抗热震性能良好。此外,20T(SZS20-1.25-Q)燃气锅炉工业试验表明,在燃气锅炉水冷壁外表面喷涂该高温高发射率节能材料后,锅炉排烟温度降低、效率提升,与喷涂前相比效率提高了3.42%,节能效果显著。

High-temperature high-emissivity energy-saving materials were prepared using Fe_(2)O_(3),Cr_(2)O_(3),MnO_(2),CuO,SiO_(2) and Al_(2)O_(3) powders as raw materials via a high temperature solid phase sintering at 1200℃ and a sequnce mixture with binder for ball milling.The microstructure and physicochemical properties of the material were characterized by scanning electron microscope(SEM)and infrared radiation measuring instrument.Results indicated that the emissivity of the prepared coating sample gradually increased with the increase of measuring temperature at 400~700℃,2~14μm band.When the measuring temperature is 700℃,the highest emissivity of the sample is 0.94.The thermal shock resistance of the coating was tested using the thermal shock method,and the results showed that the coating was heated to 1000℃ for water-cooling to deheat and cooling for 50 cycles,and no coating peeling was found,which indicated that the thermal shock resistance of the coating is good.In addition,the results of industrial tests on 20T(SZS20-1.25-Q)gas-fired boilers showed that the exhaust gas temperature of the boiler can be reduced,and the boiler efficiency can be improved after spraying high-temperature and high-emissivity energy-saving materials on the outer surface of water wall of a gas boiler.Compared with unpainted boilers,the efficiency of sprayed boilers was increased by 3.42%,which showed that this material has a significant energy-saving effect.