From Wiktionary, the free dictionary
mid-kiln (uncountable)
- The middle portion of a kiln.
1999, Maria da Graca Carvalho, F. C. Lockwood, Woodrow A Fiveland, Clean Combustion Technologies, page 510:A process model has been developed to study the effects of adding fuel in the cement kilns in non-traditional locations (i.e., mid-kiln)