5.1.2 Bottom Blowdown Time Reduction
Calculated Bottom Blowdown Losses
With a typical loss in steam generation of 3% from the conventional bottom blowdown management,
Autoflame have developed a Bottom Blowdown Time Reduction feature to minimise these losses which
occur when keeping the boiler heat transfer surfaces clean.
It follows that blowdown time can be reduced as a function of the rate of steam generation. Silt and
sludge formation within the boiler is always in ratio to work done or steam generation. Therefore the
reduction in the blowdown valve open time can be made, as long as the reduced open time is in ratio
to the evaporation rate or steam generation rate.
Blowdown savings in the region of 1-2% are possible on total fuel usage
(dependant on boiler load)
Blowdown timing automatically reduced in ratio to steam generation
Blowdown timings set by users
Operators may only trigger pre-set timings, eliminates excessive blowdown by operator
Ensures minimal blowdown to satisfy removal of solids, silt and sludge
For time reduced bottom blowdown, steam flow metering is required, this can be set through expansion
option 38.1 (see section 2.2). The accurate burner rating must be set through M.M. options 33 and
77, as well accurate fuel flow metering through M.M. option 57.
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