An application of the optical pyrometer is studied for measuring monochromatic emissivities of cement clinker with various Fe2O3 content.The idea of using “brightness temperature”is introduced into the emissivity me...An application of the optical pyrometer is studied for measuring monochromatic emissivities of cement clinker with various Fe2O3 content.The idea of using “brightness temperature”is introduced into the emissivity measurement. In this method, there is no need for measuring an actual temperature of sample surfaces, only with determining both brightness temperatures of a sample and a blackbody can the required emissivity be evaluated according to Wien’s radiation law. In practice, the cement clinker is regarded as a greybody, the monochromatic emissivity is approximately equal to the total emissivity, so a single-colour optical pyrometer is applied for this purpose. Test measurements are carried out on 10 kinds of cement clinkers. Experimental data are treated by the least square method. As a result, the emissivity variation with temperature at a certain Fe2O3 content is quite well represented by εn=α+bT. Furthermore, this work first reported that the emissivities of cement clinker change considerably with Fe2O3 contents. In multiple cement production this conclusion is very important.展开更多
文摘An application of the optical pyrometer is studied for measuring monochromatic emissivities of cement clinker with various Fe2O3 content.The idea of using “brightness temperature”is introduced into the emissivity measurement. In this method, there is no need for measuring an actual temperature of sample surfaces, only with determining both brightness temperatures of a sample and a blackbody can the required emissivity be evaluated according to Wien’s radiation law. In practice, the cement clinker is regarded as a greybody, the monochromatic emissivity is approximately equal to the total emissivity, so a single-colour optical pyrometer is applied for this purpose. Test measurements are carried out on 10 kinds of cement clinkers. Experimental data are treated by the least square method. As a result, the emissivity variation with temperature at a certain Fe2O3 content is quite well represented by εn=α+bT. Furthermore, this work first reported that the emissivities of cement clinker change considerably with Fe2O3 contents. In multiple cement production this conclusion is very important.
