Process for reducing ringing in lime kilns

A process for reducing the accumulation of mid-kiln rings in an elongate rotary calcination kiln, the process comprising:

• introducing non-condensable gases (NCGs) into an elongate rotary calcination kiln having a burner end at a first end of a kiln chamber and a feed end at a second end of the kiln chamber distally disposed from the first end, wherein the NCGs are introduced at an insertion location downstream of the burner end toward the feed end in the kiln chamber, wherein a temperature of the kiln chamber at the insertion location is in a range of 212° F. to 2,200° F., and
• measuring a first temperature at a first location upstream of the insertion location toward the burner end of the kiln chamber, measuring a second temperature at a second location downstream of the insertion location toward the feed end of the kiln chamber, comparing the first temperature to the second temperature to calculate a temperature difference, adding a cooling agent with the NCGs at the insertion location when the temperature difference is less than 100° F.