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CombustionGasesinReciprocatingGasEngines
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Fig.2.Modernwalkingbeamfurnace.Theoldfurnacewasrevampedincreasingproductionrate
over33%upto20t/h.Temperatureofoperatingofthefurnace:upto1350C,averagefuel
o
consumption:35Nm3perton-adropof27%tothatbeforerevamping.Thefurnaceis
equippedwithtenregenerativegasburnerstypeHRS,designedbyNipponFurnaceKoyo,Ja-
pan.Dimensionsofchamber:lengthwidthxheight:11x7.5x1.5m.Thepictureispresented
x
courtesyofIndustrialCombustionSystemSA,Poznan,Poland.
Thefigurepresentsthevaluesofthestreamofheatinaclassicfurnacefor
preheatingsteelat180t/hequippedwithacentralrecuperator.Theschemeof
suchafurnaceispresentedinFig.4a.ThefurnaceisinstalledinJapanatNKK
CorporationWorks[2].Afterapartialrevampingofthefurnace,itsthermal
efficiencyrosetothevaluespresentedinFig.3a.Afterafullrevamp,per-
formedonaslightlybiggerfurnace(200t/hinsteadof180t/h),whichincluded
theinstallationofregenerativegasburners,theenergybalancechangedto
thatpresentedinFig.3b.Theschemeofthatsecondfurnacewithfullyre-
vampedgasburnersispresentedinFig.4.
AspresentedinFig.3b,thefullrevampofgasburnersallowsfortheturn-
aroundof51%ofenergysuppliedasfuelintotheairenteringthefurnace.Asa
result,totalenergyconsumptioncalculatedonaunitofmassoftheheated
materialdropsfrom100unitsto49units,whichresultsintheloweringofcon-
sumptionofprimaryenergyforheatingbymorethan25%.Thiscontributes
greatlytothereductionofthegreenhouseeffectthroughloweringCO2emis-
sionbyasmuchas28tonsperhour.
