-
Furnace exit must be oxidizing preferably,
3%.
-
Fuel lines balanced to each burner by "Clean
Air" test ±2% or better.
-
Fuel lines balanced by "Dirty Air" test,
using a Dirty Air Velocity Probe, to ±5% or better.
-
Fuel lines balanced in fuel flow to ±10% or
better
-
Fuel line fineness shall be 75% or more
passing a 200 mesh screen. 50 mesh particles shall be less
then 0.1%.
-
Primary airflow shall be accurately measured
& controlled to ±3% accuracy.
-
Overfire air shall be accurately measured &
controlled to ± 3% accuracy.
-
Primary air/fuel ratio shall be accurately
controlled when above minimum.
-
Fuel line minimum velocities shall be 3,300
fpm.
-
Mechanical tolerances of burners and dampers
shall be ±¼" or better.
-
Secondary air distribution to burners should
be within ±5% to ±10%.
-
Fuel feed to the pulverizers should be smooth
during load changes and measured and controlled as
accurately as possible. Load cell equipped gravimetric
feeders are preferred.
Fuel feed quality and size should be consistent.
Consistent raw coal sizing of feed to pulverizers is a good
start. |
-
Fly Ash Carbon Content
-
Carbon in Bottom Ash
-
Air Heater Leakage
-
Air Heater Exit Gas Temperature
-
Furnace Exit Gas Temperature (F.E.G.T.)
-
Air In-Leakage
-
Superheater Steam Temperature
-
Reheat Steam Temperature
-
Primary Airflow
-
Auxiliary Power Consumption
-
Optimize Sootblower Operation
-
Boiler Exit Gas Temperature at The Economizer
-
Excess Oxygen
-
Desuperheating Spraywater Waterflow Into The
Reheater
-
Cycle Losses Due to Vent and Drain Valve
Leakage
-
Steam Purity
-
Pulverizer Air In-Leakage for Exhauster
Equipped Pulverizers
-
Pulverizer Coal Spillage
|
|
A few Words on the 13 Essentials
These have expanded from the 10 pre-requisites for optimum
combustion, first promoted in the 1980's. The point is, they are
simple, have been around a long time, and they make a great
"punch list" for resolving slagging, LOI, and NOx issues in
large P.C.-fired utility boilers. |
For more information visit:
Storm Technologies, Inc.
|
