Specific Surface
Spec
ific
ener
gy re
quire
men
t of
grin
d ab
ility
test
er
Types of Grate Coolers
A)Traveling grate cooler
B) Reciprocating grate cooler
Grate line ConfigurationGrate line Configuration
Single grate cooler
Combi-coolerCombi-stage cooler
Mechanical Features
Grate Plates
• Perfect in critical zones (nose and hook)
• Residual stresses: must be avoided by heat treatment for stress relieving
1. Chromium (Cr):1. Chromium (Cr):•Melting point 1890oC
•It increases the tensile strength of steels by 80-100 N/mm2 per 1% Cr
•Increases wear resistance•High temperature strength
3-Clinker hardness3-Clinker hardness (500 – 700) Hv
22 - -Nickel (Ni)Nickel (Ni)::•Melting point 1458oC
•High temperature strength
1 mm
Air compartments
& flap valves :
Discharge hopper of Under Grate
Grate cooler operation and controlGrate cooler operation and control
Clin
ker T
emp.
Air Te
mp.
500500
10001000
15001500
250250500500
75075010001000
20-55% 0-40% 0-40% 0-45%
Hammer type breakerHammer type breaker
11 m/sm/s4040 m/sm/s
22 m/sm/sGrateplate problems
Air beam technology
Design Design features of features of
modern modern grate grate coolercooler
Moving FrameMoving Frame
2562 ±2
840 ±1840 ±1
682 ±13452 ±4
Moving frames Central Beam
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