AUTOFLAME Mk8 MM User Manual

12 Bottom Blowdown
Mk8 MM Manual Page | 223
12.3 Bottom Blowdown Reduction
12.3.1 Blowdown Energy Savings
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 and fuel flow metering is required. Steam flow
metering can be set through expansion option 120, please see section 16 for more information. Fuel flow
metering can be set through option 57.

AUTOFLAME Mk8 MM Specifications

General

Brand	AUTOFLAME
Model	Mk8 MM
Category	Controller
Language	English