F/KN1. Inspect refractories on a regular basis and replace if cracked.
WHY? : Cracked refractories can allow direct flame
impingement on the cast iron body of the burner. This will
greatly reduce burner life and could lead to costly repairs.
F/KN2. Always wire brush
spacers and their mating castings when replacing burner section components.
Don’t hammer them out to attempt to straighten them, but
replace them if they are distorted. The rule of thumb for this
low cost component which plays such a critical role in burner
performance is "When in doubt, change them out."
WHY? : Clean and non-distorted spacers maintain the
consistent orifice critical to proper flame distribution and
burner performance.
F/KN 3. When
rebuilding a Red-Ray type F or FH model burner, make sure to position the
baffle plate as forward
towards the refractory as possible before tightening the baffle
plate bolts or screws.
WHY? : This helps to ensure that the orifice created
when assembled will have minimal restrictions.
F/KN 4. Make sure
refractories are seated flush to the base plate and tube combination part
when rebuilding Red-Ray type KN, F and FH model burners.
WHY? : Poor fitting refractories may create non-uniform heat distribution. If refractories
will not seat flush, the base plate and tube combination part
probably needs replacing.
F/KN 5. When
rebuilding type F or KN burners, the best practice is to remove all
burner
sections from manifold for rebuilding or replacing.
WHY? : Replacing only some burner sections may create
weaker output on older sections as they may have slightly
clogged orifices.
F/KN 6. Flames exiting
refractories should be minimal for optimum burner efficiency
on Red-Ray type F and KN burners.
WHY? : Flames longer than 1/2"-1" exiting
the refractories indicate one or more of the following conditions:
A) Improper Air/Gas Ratio-
Solution: Make adjustments to butterfly valve (air)
and/or mixer (gas).
B) Excessive Air/Gas Volume on Correct Ratio –
Solution: Reduce by adjusting the butterfly valve (air)
and/or mixer (gas).
C) Deterioration of refractory and/or burner section –
Solution: Remove burner section, inspect parts and
clean, rebuild or replace as needed.
F/KN 7. For optimum process performance and burner efficiency
Red-Ray type F and KN burners should be rebuilt or replaced
when
dark spots become numerous.
WHY? : Dark spots along the radiating refractories
indicate areas of blockage or warpage in the orifice or other
physical conditions which leads to less efficient combustion
and over firing of the immediate adjacent areas of the burner.
