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What is the difference between kiln shell hot spot & red spot?

By: Nael Shabana qatar.cement@yahoo.com

Hot spot is isolated area on the kiln shell with abnormally high temperature. It is quickly detected by a shell scanner or with a portable infra-red pyrometer. It can’t be seen during the day, and can hardly be seen at night (figure-2). Therefore, based on the visible radiation spectrum for hot surfaces, their maximum temperature must be below 550°C.

Red spot (figure-3) differ from hot spot in that it is visible at night. While a hot spot is just a warning, a red spot always demands some kind of action from the kiln operator.