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Show 3* in CM o 50 40 •o- 2 301 u <u > 20 c o £ 10 E a 0 x o z Fig.22 NOx measurement data of XB-16 Measured on May,1974 Burner:XB-16 Boiler:2.5 ton/hsectional boiler Instrument used NOx..Yanaco ECL-16 02 ..YANACO EtfG-16 CO.. YANACO EER-16 ©••» .NOx(exhaus »••; .N0x( •• x~ 02 5xl05 10x10s 15xl05 20xl05 25xl05 t gas damper open) shut) •2 •1 0 c o CO u u c 0) CJ C o CJ c cu o 00 c cd s cu (2) GNC burner With this burner, combustion air is divided into two stages, as shown in Fig.23, for two stage combustion, and the secondary air is injected for re-circulation of the combustion exhaust gas by the energy thus NOx generation is - suppressed. Fig.23 Structural drawing of GNC burner Pilot burner Primary ai £3 Combustion exhaust S e & ^ S*s ft s j ^ t e S - V s ^ * Gas nozzle Secondary air zle Frame protection plate Since GNC burner has a substantial flame momentum it is suitable to return combustion fire tube boilers as well. On the test of forward flow combustion boiler and return combustion boiler with same burner, NOx is lower with the former. The data by GNC 25 burner with combustion capacity of 250 xlO1* Kcal/h is shown in Fig. 24, and the relation between 02 and NOx of the same burner is shown in Fig.25. The outline specification of GNC burner is as shown in Table-5. c9 - 2 6 - |