613 A Study of Combustion Characteristics of Diffusion Flame on Non-circular Burner

We examined relations between the shape of the staged zir n 〔》zzle ( after airport )and the mixing perfGrmance ill the furnace for two staged combustion ， Four di匠erent shapes of ports ， 1hole ， 4 holes． 9holes ， Lobe shape ， with the same Dpen area of nozzle outlet w ere used to examine the e αect on the NOx and CO performance ． The gas veloci 亡 y in the furnacc and the air ratio were fixed at the values near the operating condition of the actual boilers us much as pog． sibIe ． NiO ＝ and CO performancc " was corrdated with the 【 nixing perfermance in the downstream sidc of the after air port ． CO decreasc when the s ' tandard devia亡ion of the local air ratio ill the furnace becorne smal ［． This is because extrcmely low oxygen concentration region is hard加 be f6rmed in the furnace． On the other harld， NO ．＝ increase if the standard deviation o 正 tha亡 is srnall ． The overall air ratio was set at l． 15 for the experimental condition ． Under this conditi ( 〕n ， improvelnent of mixling performance brings all 量 ncrease of thermal NO τbecause of hlgher gas te皿 perature ．凧 i e aLso exarnined the nozzle design criteria in order Lo predict its mixjng performance beforehapd ， It was found that the circumference length of the jet How bad a good correlatt n with the standard deviatiDn Qf th巳 Iocal air ratio ， When anozzle has a longer circumference lcllgLh ， mixillg pcrformance of it be〔 Qmes better ，

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Shape Effect of Staged Air Nozzle on Two Staged Combustion Characteristics(Thermal Engineering)

折井

谷口

2010

Trans.JSME, Ser.B

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613 A Study of Combustion Characteristics of Diffusion Flame on Non-circular Burner

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Shape Effect of Staged Air Nozzle on Two Staged Combustion Characteristics(Thermal Engineering)

Shape Effect of Staged Air Nozzle on Two Staged Combustion Characteristics(Thermal Engineering)

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