What is the maximum red spot temperature on the shell force kiln to stop?

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What is the maximum red spot temperature on the shell force kiln to stop?

By: Nael Shabana qatar.cement@yahoo.com

The short answer is 550ºC if the spot is permanent and persistent. This is a short answer, but when we talk about red spot, damaging of shell, long kiln stoppage, and losing millions of Riyals or Dollars; this answer cannot be

 

acceptable. A number of factors are absolutely necessary to be considered in any red spot before taking the decision of kiln stoppage:

 

  1. Proximity of the red spot to the tires or gear: Red spots near tires and bull gears require immediate action. These spots almost invariably force the kiln down. Shutdown procedure must start immediately to avoid damaging the kiln shell.
  2. Extension of the red spot: The longer the circumferential extension of the red spot, the greater the risk of shell permanent deformation or collapse. If there is any persistent red spot covering more than 10% of the kiln circumference (figure-4); Kiln should stop immediately.
  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 hits the red spot, the shell may develop cracks under sudden quenching. Sometimes the brick results severely crushed in the red spot area.
  5. The presence of shell cracks in the vicinity of the spot: The presence of cracks in the vicinity of the hot spot calls for an immediate kiln shutdown to avoid shell splitting.

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