16 PROjECT PRIDE
the PG values are subject to change accordingly, so that
any benefit which is not attributable to technology shall be
passed on to the buyer.
For example, coating the internal as well as the external
surface of kiln, tertiary air duct (TAD), PH cyclones,
calciner, etc., with heat resistant paint/aluminization,
would give us a reduction in radiation heat losses which
would not be attributable to supplier-guaranteed specific
fuel consumption.
Raw Grinding Technology
We have provided following inputs to suppliers for designing
of raw grinding system:
- Grindability: The limestone grindability given to
suppliers for designing is 5 kWh/t @ VRM meter;
however, OCL line 1 and 2 mills are operational
with around 4.5 kWh/t @ VRM meter. During raw
material testing in FLSmidth lab, the grindability
was tested around 3.8 and 3.9 kWh/t; so we kept
some margin and asked suppliers to design the
system based on 5 kWh/t for guarantee.
Summary of Grinding Test Reports
Material UOM Tender
value
FLSmidth
1 st report
FLSmidth
2 nd report
KHD
report
TKIL
report
Limestone kWh/t
@ VRM/
RP meter
@ 15%
residue
on 90
microns
5 @
VRM
meter
3.9 @
VRM
meter
3.8 @
VRM
meter
5.8
@ RP
meter
4.8–5.3
@ VRM
shaft