TechnicalInstructions LMVSeries
DocumentNo.LV5‐1000
Section6 Page14SCCInc.
SuggestedO
2
TrimCommissioning‐PremixMeshBurnerorNozzleMixingBurnerwithHigh
PercentageofFGR(TypicallyLMV52.440)
1. Thecommissi oningprocedureassumesthefollowing:
a. AllPre‐RequisitesforanLMV52systemwithO
2
trim(andVSDifequipped)havebeenmet
accordingtoSection4ofthisliterature.
b. TheRatioControlCurveshavebeencommissionedaccordingtoSection4ofthisliterature.
c. Section6ofthisliteraturehasbeenreadand un derstooduptothispoint.
d. Ifastartmodewithcombustionairtemperaturecompensationwillbeused,theair
temp
eraturesensormustbeinstalledandactivated.
2. AswasthecasefortheRatioControlCurvesinSection4,thesamefreespreadsheetcanalsobe
usedtoassistinthecommissioningoftheO
2
trim.ThisspreadsheetgraphicallyillustratestheO
2
curvesaswellasprovidesanorderlywaytorecordthedetailsofhowtheburnerwassetup.
Figure6‐3:LMVxCurvesSpreadsheet
3. ThekeytocommissioningtheO
2
curvesquicklyandeasilyiscontainedintheRatioControlCurves.
Specifically,thefollowingmustbeachievedforeachpointontheRatioControl Curves(as
paraphrasedfromSection4ofthisliterature):
a. Safecombustionasverifiedbyacalibratedstackgasanalyzer
b. The%loadmatchingthefuelflowwithin+/‐3%
c. Emissionscompliance
d. SmoothRatioControlCurves(nosharppeaksorvalleys)
e. VSDspeedshouldincreasewithloadinalinearfashion(ifequipped)
f. Determine the %O
2
wet corresponding to the fuel rich limit (O
2
Alarm value) for each point.
Probingmayormaynotbepossibledependingontheburnerdesign.Also,followburnerOEM
recommendations.Mostmeshburnerelementscanbedamagedifruntoofuelrich.*
g. Findandrecordthe%O
2
wetcorrespondingtothefuelleanlimit(O2MaxValue)forPoint1and
Point10byprobingoraccordingtoburnerOEMrecommendations.*
h. Find the target %O
2
. For these burners the target %O
2
for each point will be the %O
2
wet
corresponding to emissions compliance (typically CO, NOx).After the target %O
2
is found,
increasethe%O
2
andleavethepointatleast0.5%O
2
leanerthanthetarget%O
2
.Recordthisas
the"saved"valueforeachcurvepoint.
To Next Page
Loading...
