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. Figure-2: Hot spot with a temperature of 570°C Figure-3: Red spot with 830°C temperature 3: What is the maximum red spot temperature on the rotary kiln shell force
Hot spot is isolated area on the rotary 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).
The rotary kiln is a red kiln. At this time, it can be observed by infrared scanning temperature curve and its position can be accurately determined, and the concrete level of the red kiln still needs to be observed and implemented on the spot.
3. Kiln alignment conditions: Misaligned kilns induce localized stresses along the kiln length. If the red spot coincides with an area of stress concentration, the shell sometimes elongates or twists beyond recovery. 4. Whether the red spot is exposed or under roof: If the kiln shell is directly exposed to the elements and a heavy rainstorm .
2.If the red spot is less than 1 m2 and located in the burning zone with the surrounding kiln shell not being extremely hot, try to build up coating in the affected area by shifting the reaction zones up and down within the kiln. (burner adjustment and kiln speed variation).Promote coating formation in affected area by placing cooling fans to cool the kiln shell
Design features of rotary cement kilns. The shell of the kiln is made of mild steel plate. Mild steel is the only viable material for the purpose, but presents the problem that the maximum temperature of the feed inside the kiln is over 1400°C, while the gas temperatures reach 1900°C.
The rotary kiln systems of the cement industry destroy these trace components virtually completely.  Polycyclic aromatic hydrocarbons (PAH) PAHs (according to EPA 610) in the exhaust gas of rotary kilns usually appear at a distribution dominated by naphthalene, which accounts for a share of more than 90% by mass. The rotary .
9 Rotary Kiln Processes: With the arrival of rotary kilns, cement manufacturing processes became sharply defined according to the form in which the materials are fed to the kiln. materials were either ground with addition of water, to form a slurry containing typically 30-45% water, or they were ground dry, to form a powder or "raw meal".
temperature differe nces of the kiln cir cumference provok ed b y a unilateral crusting or red spot ca used . . The rotary cement kiln forms a major part of any cement works. The kiln is a large .
A The Red Spot is located in upper transition Continue normal operation of the kiln. Start cooling this spot with fans Shorten the flame to bring the black feed area under the burner nearer or over the red spot to try to form a new coating inside the area empty from bricks. Red Spot On The Kiln Shell Action To Be Taken In Case Of: zone or in .
the Kiln Introduction The corrosion of the shell in the rotary kiln of cement plants can be a very serious problem. In some cases, the damage is so severe that an entire section of the kiln needs to be replaced. The total maintenance cost and production loss can be in the hundreds of thousands of US dollars.
Modeling coal combustion in a rotary cement kiln. January 1999; Authors: . There are no spots of. . and th e red to the combusti on of fixed carbon.
General layout of a direct fired countercurrent rotary kiln used in cement manufacture Rotary kiln body, with drive gear and 2 tyres (riding rings) A rotary kiln is a pyroprocessing device used to raise materials to a high temperature ( calcination ) in a continuous process.
Mechanical maintenance-of-cement-rotary-kiln 1. i A PROJECT REPORT ON STUDY ON MECHANICAL MAINTENANCE OF CEMENT ROTARY KILN Submitted in partial fulfillment for the award of the degree Of BACHELOR OF TECHNOLOGY IN MECHANICAL ENGINEERING Submitted By R.VIJAYA KUMAR 11J45A0306 Under the Guidance of A.RAVEENDRA Professor MALLA REDDY ENGINEERING COLLEGE (Affiliated to Jawaharlal Nehru .