World Cement - Hot `N` Cold
Derek Stuart, Global Product Manager - Power, Combustion and Environmental, and Manfred Hayk, Global Infrared (IR) Product Manager, look at new techniques for temperature measurement in cement manufacturing.
Controlling a cement kiln is a challenging task. The efficient and consistent production of high-quality cement with the lowest environmental impact requires careful attention to the raw mix feed rate, the fuel/air ratio, and the temperature distribution throughout the kiln.The task is made more complicated because conditions within the kiln make it difficult to measure many of the key operational parameters.
Temperature measurements within the kiln are especially challenging. Kiln rotation, high temperatures, and the movement of the sintering material along the kiln make thermocouples and other contact temperature sensors impractical. Radiation thermometers, also known as pyrometers, allow non-contact temperature measurement, but their effectiveness is limited by the high dust loading, especially within the burning zone. Nevertheless, the burning zone temperature (BZT) is an important measurement because it shows whether there has been a complete transformation from C2S to C3S, which occurs in the region of 1300°C – 1450°C (2372°F to 2642°F).