Page 106 - Boiler plant and distribution system optimization manual
P. 106
Boiler Tuneup 91
• Make sure that the burner diffuser (impeller)
is not damaged, and is properly located with
respect to the oil gun tip.
• Check to see that the oil gun is positioned
properly within the burner throat, and the
throat refractory is in good condition.
gas burners
• Be sure that filters and moisture traps are
in place, clean and, operating properly to
prevent gas orifice plugging. Inspect gas-
injection orifices and verify that all passages
are unobstructed.
• Look for any burned off or missing burner
parts. Confirm location and orientation of
all parts. (Viewing ports are very helpful to
identify faulty flame patterns or other prob-
lems)
Pulverized-coal burners
Figure 9.2—Boiler exhaust temperature above tem- • Verify that fuel and air components, pul-
perature of water-steam temperature in boiler. verizes, feeders, primary and tempering-air
dampers etc are all working properly.
• Verify proper flame pattern through the • Clear coal pipes of any coal and coke depos-
viewing ports located at the sides and back its.
of the boiler, if installed.
• Check burner parts for any signs of excessive
• Inspect burners for warping or overheating, erosion or burn-off.
coke and gum deposits. Clean or replace
parts as appropriate. Spreader-stoker firing
• Check grates for wear. Check the stokers and
• Inspect oil tip passages and orifices for wear
the cylinder-reinjection system for proper
and scratches or other marks. Use proper
operation.
size drill or machine gages for testing.
• Confirm the proper positioning of all air-pro-
• Verify proper oil pressure and temperature
portioning dampers.
at the burner. This may include resetting the
• Verify proper coal sizing.
fuel oil heater to the grade of oil presently
being fired, calibrating gages and instru-
Combustion controls
ments and resetting pressures to manufac-
• Be sure that all safety interlocks and boiler
tures values or values indicated in engineer-
trip circuits operate.
ing records. If changes are made, careful
observation of actual effects they produce is • See that all system gages are calibrated and
important in the case a problem develops. functioning.
• Verify proper atomizing-steam pressure. • Eliminate play in all control linkages and
Also, be aware a defective steam trap may air dampers. Also check to see if there is
introduce unwanted water into the flame accurate repeatability when load points are
zone. approached from different directions.
