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Definition of cycles of concentration (NC & NF).We define the Make-up cycles of concentration (NC) as::
NC = MU / BD (e)
And NC represents the concentration of the make-up into the boiler.
We define also the Feed-water cycles of concentration (NF) as:
NF = FW / BD (e.1)
This represents the concentration of the feed-water into the boiler. Making the material balance for a water analysis constituent which comes into the circuit only through make-up and leaves only through blowdown and losses, is not transformed, destroyed or precipitates, like chloride ion, we can correlate NC and NF and calculate them from water analysis.
MU CLBD - CLC NC = -------- = ------------------- (e.2) BD CLMU - CLC
FW CLBD - CLC NF = ------ = ----------------- (e.2a) BD CLFW - CLC
and
NC = X * NF
We can calculate NC and NF from the chemical analysis data. |
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