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Annular Shaft Kiln

ringschachtofenThe Annular Shaft Kiln is characterised by its annular shaped shaft cross section located between an outer and inner refractory lined cylindrical steel shell.

One of the main features of this kiln type is the continuous stream of exhaust gases with a high CO2-content, ranging between 26 and 32 %, depending on the type of fuel used. Furthermore the kiln allows adjusting the reactivity of the quicklime produced from soft burnt to medium burnt. These characteristics make the Annular Shaft Kiln especially suitable for producing burnt lime for the PCC and soda industries.

The Annular Shaft Kiln can be fired with a wide range of fuels. The daily output of burnt product ranges between 200 and 600 tpd.

A detailed description of this kiln type can be found in the following brochure:

 

Latest News

December 2012 issue of „Maerz News“ published

The December 2012 edition of “Maerz News” focuses on the ability of Maerz to locally manufacture kiln components in several countries world-wide, on a successful conversion project from natural gas to lignite firing in a Polish lime plant as well as on new orders received and successfully implemented projects.

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Local manufacturing of kiln steel structure in China

Maerz Ofenbau AG, being embedded in ThyssenKrupp Polysius’ world-wide network of companies, has recently taken advantage of being able to have the steel structure for its kilns manufactured in China. Maerz recently placed an order with Polysius Shanghai to supply the steel structure for a large PFR Kiln.

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Fuel alternatives in ZPW Trzuskawica’s Kujawy lime plant

Fuel costs are a key factor in the production of quicklime and, consequently, flexibility in the use of low cost fuels of utmost importance. Kujawy lime plant is operating two 450 tpd Maerz PFR Kilns since 1972, initially with heavy fuel oil, later on with natural gas as fuels. Kiln No. 1 has now been successfully converted to lignite dust firing.

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