AUTOFLAME Mk8 MM Installation And Commissioning Guide

5 Bottom Blowdown
04.09.2016 Mk8 MM Expansion Features Installation and Set-Up Guide Page 85
5.2 Bottom Blowdown Reduction
5.2.1 Blowdown 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 9 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