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Benefits of cycling
Fast Power Plant Cycling to Meet Demand, Without Corrosion Risk – DCC1000e

Fast Power Plant Cycling to Meet Demand, Without Corrosion Risk – DCC1000e

Fossil fuel power plant cycling is becoming
increasingly more common due to changes in the power generation environment. With the ever-growing addition of renewables
to the grid, most of these plants no longer need to operate at full capacity, all of the
time. Now, they can partially power down at night
to save on fuel costs. With cycling, a power plant must be able to
return to full power as fast as possible to be ready for peak usage hours, and be able
to handle wide swings in temperature and pressure, day-in and day-out. Unfortunately, most plants were not built
to function in this manner, thus having analytical instrumentation that can respond rapidly is
critical to prevent damage from corrosion and to ensure plant safety. Direct (or specific) conductivity and cation
(or acid) conductivity measurements provide a good indication of the concentration, along
with a way of detecting contamination to help minimize corrosion of plant components. However, when a base-load plant starts to
cycle carbon dioxide air leakage into the condenser and amine breakdown might also be
in the sample, the carbon dioxide then creates carbonic acid, that can raise conductivity
levels and can be interpreted as corrosive contaminants, even though this is not really
the case. Degassed cation conductivity can eliminate
this interference, by heating the sample to near boiling to drive off the carbon dioxide
gas. The result is a conductivity reading that
provides an unambiguous measure of corrosive contaminants. During plant start-up, even minutes of delay
in delivering power can result in major lost revenue. The capability of degassed cation conductivity
to confirm water purity limits earlier than cation conductivity makes this measurement
a must-have. METTLER TOLEDO Thornton’s DCC1000e degassed
cation conductivity panel includes all three conductivity measurements, as well as sample
temperature and flow to provide fast and reliable online measurements to quickly indicate when
water and steam conditions are adequate for start-up.

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