Clinker coolers are fitted at the discharge end of the kiln to perform following functions: -
To cool the hot clinker discharged from the kiln.
To recoup high grade heat from Hot Clinker and supply it to Kiln/Calciner as Secondary/ Tertiary Air
Specific Grate load:45 - 50 t/d m²
Designed cooling air: 2.0 -2.2Nm³/kg Clinker
Required cooling air: 1.7 -1.8 Nm³/kg Clinker
Provided with Inlet Stationary inclined Grate(ISIG) and Dynamic Flow regulator(DFR)
Lower heat consumption/Kg Clinker due to High Secondary Air temperature which helps in intense burner flame
High Tertiary Air causes good degree of Pre-calcination in Calciner and reduces fuel consumption.
CPG supply cooler in two independent entities which are joined together for maximum recuperation of Heat.
A) Inlet Stationary Inclined Grate (ISIG):
This is an inclined arrangement of specially designed anti spillage Grate plates, arranged in downward steps formation. These Grate Rows do not move. The Castable cover is shaped in such a way to have spread of hot clinker on grate without void.
The high depth hot clinker bed is formed which is supplied with a concentrated Air load underneath. This results in quick and high grade heat recovery from clinker. This heat is supplied in the form of Secondary and Tertiary Air flow to kiln and Calciner at optimum proportions.
B) Reciprocating Grate Cooler:
As ISIG does the major heat recovery task, for balance Clinker cooling it is equipped with conventional Reciprocating Grate Cooler.
Special features of ISIG/DFR overConventional Inlet
No Internal Ducting/manual Dampers
Uniform Distribution Of Air Through-out the with Inlet Stationary inclined Grate (ISIG) Zone ensured By Dynamic Flow Regulators (DFR)
Air Blasters Installed At Front & Side Walls Eliminate “Snowman” Formation
No Clinker Fall Through
Advantages of ISIG/DFR (Fixed Inlet)
Improved Operation due to appropriate Air distribution in response to bed resistance. DFR regulates the Air flow according to material Bed height.
Reduced Maintenance due to no moving parts.
Higher Cooler Throughput due to high cooler efficiency.
Less Power Consumption due to reduced specific air load to cool the clinker.