Rectangular Maerz® Kiln
The simplest design of a PFR Kiln is where two shafts with rectangular cross section are placed side by side lengthwise in such a manner that the kiln gases can flow directly from one shaft to the other via a direct crossover channel. Because of its geometry this kiln type is easy to
manufacture and requires less steel structure and refractory materials in comparison with circular kilns.
This basic and cost efficient kiln type is mainly used for output rates of up to 400 tpd of burnt lime or dolomite. For larger kiln capacities Maerz has developed a special patented stone charging system, which allows for an efficient regulation of the stone distribution in the shafts; with the assistance of hydraulically steered flaps as well as uniform gas flow in the shafts, which is a requirement for consistent and high quality products.
World-wide, Maerz has built more than 190 rectangular PFR Kilns operating with gaseous, liquid and pulverised solid fuels, or a combination of these fuels, since 1966.
A detailed description of the rectangular PFR kiln can be found in the following data sheet: