2017 年 71 巻 1 号 p. 579-586
High-accuracy temperature control during clinker burning is important for reducing energy consumption in cement production. Although a radiation thermometer is conventionally used for temperature measurement of clinker, it suffers from the problem that the measurement accuracy is reduced by the influence of dust in the kiln. We therefore propose a measurement method that eliminates the influence of dust by using a separate radiation thermometer for measuring the dust temperature. However, this method suffers from the problem of measurement error when the dust concentration and temperature are non-uniform. To further improve measurement accuracy, we devised a method for measuring clinker temperature by using two radiation thermometers aimed at the clinker and a nose-ring plate attached to the outer circumference of the kiln exit. When this method was applied to an existing kiln, the measurement error was found to be －10 to 25℃, confirming that the accuracy was greatly improved over the conventional method.
