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.