Abstract
Coating slurry, in which the infrared radiation material is the main content, is applied in industrial furnaces to improve heat transfer and raise efficiency of furnaces. In this study, a series material with a spinel structure was prepared, and the emissivity of different formulas in two wavebands (3–5 μm and 8–14 μm) was measured. To ensure that the material delivered high emissivity, optimization models were proposed using Matlab software, and proportions of CuO, Co2O3 and Fe2O3 were found to be 16.98%, 16.73% and 66.29%, respectively, in the optimal formula. Thus, using the series material and additives, according to mixture regression method, fifteen formulas of coating slurry were designed, prepared and the emissivities were measured. With the Matlab software optimization model, the content of coating slurry was optimized and the corresponding emissivities were measured to be 0.931 and 0.905 in two wavebands, which is in agreement with the optimized calculation.
Highlights
70% of the energy consumed in China is used in industries, and 25–40% of this energy is used in combustion within industrial furnaces [1]
The particles became more irregular with the increased addition order to know whether the Cu had been dissolved in the spinel, energy dispersive spectrometer (EDS)
±0.004 which means the accuracy of measured based coating slurry, with particular consideration for near and middle infrared radiation emissivity is believable
Summary
70% of the energy consumed in China is used in industries, and 25–40% of this energy is used in combustion within industrial furnaces [1]. Many technologies have been proposed to raise the efficiency of industrial furnaces, and it has been found that the enhancement of heat transfer in the heating process within furnaces is an efficient way of improving the furnaces’ efficiency [5]. In this respect, an infrared radiation coating was developed and applied to the surface of the inner walls of furnaces, and this is widely used in industry [6]. According to previous industrial practices, the application of infrared radiation coating can raise the efficiency by 5–30% [8]
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