Twin Shaft Regenerative (TSR) Kilns:
The Twin Shaft Regenerative (TSR) kiln is a double-shaft vertical kiln which utilizes the regenerative process for lime calcination. When one shaft operates in burning mode, the other shaft operates in regeneration (preheating) mode. Each shaft operates for an equal period of time in burning and regeneration modes. During combustion cycle limestone absorbs heat from the combustion gas and in the second cycle newly charged limestone absorbs heat from exhaust gas coming from the shaft under calcination process. Gas flows from one shaft into the other via a connecting channel between the two shafts. TSR kilns currently are the best option for high – and medium – reactivity lime production in terms of:
Lower fuel consumption,
Lower maintenance costs,
Lower emission rates,
Higher quality of product.
Cimprogetti’s TSR kilns are available in two main groups:
• Kilns with direct crossover channel featuring a single channel placed between the shafts, (Flex Reversy®)
• Kilns with radial crossover channel featuring circular channels around the shafts which are connected to each other. (Vanguard®)
The VANGUARD® Lime Kilns represent the latest version of radial crossover channel kilns developed to respond to the lime market trend demanding for higher kiln capacities (from 500 to 700 tpd).
The main features of VANGUARD® kilns are:
special limestone loading system
even distribution of limestone over the kiln shaft cross section
four independent discharge drawers
innovative refractory lining with “Pillarless” design
high-grade lime quality with various types of fuel
• Flex Reversy®
The CIM-Flex Reversy® kilns represent the symmetric version of kilns equipped with direct crossover channel. The cross section is polygonal with symmetric design. The kiln is especially suitable for obtaining quicklime with consistent quality capable of burning smaller limestone fractions (15 to 150mm) to the benefit of a better quarry mass balance. This kiln capacity range is from 100 to 600tpd. The axial – symmetric shape of cross section has been designed to assure a uniform flue gas passage across the kiln section.
The main features of Flex Reversy® kilns are:
No bending sheets in shell compartments;
Less fabrication time;
Easier steel works transport;
Easier steel works erection;
Less welding during erection.