Lime Shaft Kilns ScienceDirect
#0183;#32;The patent was transferred in 1965 to Maerz Ofenbau AG in Zurich / Switzerland which then further developed the kiln process and the kiln design. Operating principle Due to the conditions of parallel flow of the kiln charge and the combustion gases in the burning shaft the parallel flow regenerative kiln (PFR kiln) is perfectly suitable for the production of soft burnt, high reactive lime.