Technology And Materials Research To Enhance The Radiation Of High Temperature Furnace Inner Wall

High-temperature kiln is the key equipment of industrial heating, and iswidely used in metallurgy, chemical, cement, power generation, glass, ceramics andother industries. However, high energy consumption and high pollution areenormous challenges faced by the development of high-temperature kiln. Theexisting energy-saving technology is still very backward compared with developedcountries. Especially, the thermal efficiency of high-temperature kiln needs to bedramatically improved. Therefore, the use of new technologies, new processes, andnew materials to further improve the thermal efficiency of the kiln become a hottopic. In this thesis, we effectively improve the thermal efficiency of thehigh-temperature kiln by the combination of high emissivity material preparationtechnique and radiation enhancement technology.The contributions of this dissertation mainly include the following parts:(1) Using the high-temperature kiln’s radiation model, we calculate theradiation characteristics of different surface structures on the inner wall of the kilnand propose surface design of enhanced kiln wall’s radiation. The not-tighthoneycomb surface has the excellent thermal efficiency.(2) From the idea of enhance the wall surface’s infrared radiation to improve thethermal efficiency, we choose iron slag as base material and add in a variety of metaloxides. After milling, high temperature sintering and other processes, we obtain aspinel structure powder material with infrared high emissivity. Using together withSi-based colloidal material, we get an inexpensive infrared high emissivity coatingmaterial with infrared emission rate as high as0.91and refractoriness to1150℃.Using this high emissivity coating material in glass industrial kilns, we achievedgood energy-saving effect.(3) In order to combine the research and development of high emissivitymaterial, we also developed a simple infrared emissivity test device and amultipurpose energy-efficiency test kiln which played a key role in the development and application testing of high emissivity material.These results of this thesis show that the high infrared emissivity material andreasonable structure design of the surface is an effective way to enhancehigh-temperature kiln radiation and achieve energy-saving, which has importantimplications for the research of refractories and the development of high-temperaturekiln’s energy-saving. The composite is proved to be significant energy-saving, longlife, and suitable for a variety of high-temperature kilns.