2.5.3
Lime
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NOTE: Contract for lime shall be for a period
longer than one year. Ca0 content and amount of
grit shall be maintained throughout length of
contract.
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The lime to be used in the system will be high-calcium pebble quicklime (20
mm x 0) (3/4 inch x 0). The high-calcium pebble quicklime will have a
"high" reactivity as defined and as determined by ASTM C 110. The expected
chemical analysis based on ASTM C 25 is as follows:
Typical, Percent
Range, Percent
Ca0 (Available)
92.0
Ca0 (Total)
96.0
Mg0
0.4
Si0
0.7
Fe203
0.09
A1203
0.07
2.5.4
Slaking Water
The water to be used for lime slaking will be boiler blowdown which has
been diluted with city water for cooling to a temperature of 38 degrees C
100 degrees F. The following water quality criteria will be maintained:
Constituent
Concentration
Combined sulfate, sulfite and
bisulfate ions
Less than 500 mg/1
Total dissolved solids
Less than 1,000 mg/1
Total suspended solids
Less than 100 mg/1
2.5.5
Process Water
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NOTE: Due to the variable proportioning of the
plant wastewater streams which will make up the
process water, the quality of this water is expected
to be more variable than that of the slaking water.
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FGD system processes other than lime slurry preparation and slurry line
flushing will utilize plant wastewater. Plant wastewater will consist of a
mixture of variable proportions of boiler blowdown, cooling tower blowdown,
process wastewater and potable water.
2.5.6
Compressed Air
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NOTE: When retrofitting an existing power plant
specify increased volume for compressed air system.
Insulate system where applicable. Compressed air
supplies will be as follows.
SECTION 15864N
Page 31
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