Characterization of Combustion Oscillation and Reduction of Abnormal Oscillation in a Power Generation Gas Turbine

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(1)대한기계학회 2004년도 추계학술대회 논문집. ± ² ³. ´ µ ¶ · ¸ ¹ ± º » ¼ ½ ¾ ¿ À ÄÅ ½ ¾ ¿ À Æ Ç È. Á Â. Ã. -ÊÉÌËÍ ÎÐÏÒÑÒÓ ÔÖÕÊ×ÖÓ Characterization of Combustion Oscillation and Reduction of Abnormal Oscillation in a Power Generation Gas Turbine Seo, Seok-Bin,. Ahn, Dal-Hong,. Ø ÙÛÚÛÜ áãâÖä åçæÒØ Ù ). Key Words: Combustion Oscillation( Combustion(. Chung, Jae-Hwa. ), Gas Turbine(. Ý ÞÒßÛà. ), Lean Premixed. Abstract Gas Turbine combustors for power plant can be reduced NOx emissions using lean premixed combustion technology. But the combustors are likely to occur combustion oscillations which damage operation reliability and mechanical life of the gas turbines. In this paper, characterizations of oscillation in a gas turbine combustor for power plant are presented. Combustion dynamics occur 1 1.5 psi in amplitude with low frequency less than 140Hz during normal operation. An abnormal high level dynamics, 2.0 psi amplitude occur at 125 Hz frequency. Abnormal combustion oscillation is reduced by modulation of fuel supply valve control schedule.. . - . / 021 354!6 78$9 :;=<> /7 8 ? @ 23% A B5C5D* EGF H C #IJF K 780L

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(34) 대한기계학회 2004년도 추계학술대회 논문집. $&% '(*)+ ,.- %/ 1$ %2'( )+ 354.6 4) Group 4~6 0 open $7*,8-*%/ @A B C 2.3 98:;<>=8? 2.3.1 9:8;< =8?@A BC $J DKELM 0 NO$F PQ D.D.EEFL(8M G NHO I8probe W +U&X8R Y&Z$7 [R \$D.].E^ F . SM1 _TàGU.VJ de( 1f$7 D.EF g1h M probe b'ac t _a0 P.Ci(8FG jukv6 El8wmx $y7 z8R n8oU 1{p$q7 6 |i&U8rs}8R$ NO$~ u v$].^ . Fig. 3J DK (8G {s D.ELMNO o\h-2U8^ .. Combustion dynamics(psi). . Mid T one High T one. . . ! #" %$ &(')*()+,!-.,"-*($)/0')10) 243 57698;: 6< =. Ä 1L ÅÆ5» ¦ q6 Ç eÄ ¨^ . (2) È D.Ë EFh ¿&À ( )É Ê Ã Å Æ h NÈU&^ . (3). Ù Ú ÛÝÏßÜ ÞàÑ Ü × Ü ÎÌ ÍÐÏÒÑÔÓ ÖØÕ × Ü æÜ (2) á âä ã å âèç éëêØìêØíîðïñêÒòóêõôßöàö÷öàö÷ö÷ö U È( Table 1W ø Ä U*i ¡ 8 ù DKEË F ¿Àú61} W Ê Ã ÅÆsh RÄ N $].^ . s 'KÀ DKEFh Ê Ã ÅÆt 1L ÅÆ / 135Hz » ¦q6 s q (aG · D.Eµ W ¶O 125Hz ýU.J þ 5ûü ÿU ^ . U 6Ä1s} & D.Eµ¶O ( )É ~¤ ÂsÃ 1L ÅÆ ýU D.DaEE F ¢ ¿À 2 £ U z . ¦ q6 Ç ý ø W e¨^ Ä . U W U DKEFh ¿8À ¤ YsÁ&¨ ~ Â Ã LsPM Q D.E ¢ 2U J ¦0 $F GJ ¿À ú h l

(35) J i ¡0 l J 80 ~ K^ .. Damping Coil. Gas Turbine Combustor. . Fig. 4 Combustion dynamics in ABB 11N Combustor. Dynamic pr. Sensor. Sensor Box. Low T one. N2 purge sys Signal Processing -Signal Conditioner -A/D Converter -P.C. Fig. 3 Combustion oscillation measurement system. Fig. 4 J 'D EqFs6 (.G Hz*IN$OJ D. EW LsR M0 7 3/ ~ a^ . DaELsMh F8J t 140Hz ' U8$(8G /o 8q FJ 6 ^ 1~1.5psi(peak-peak) 6 . & J 13~70Hz6 U.^ . U '&h D.ELMQ D [h E¤ i ¡lM( h D.E ¢8HI.£5U l&M z¥*¦&q6 §O¨^ . ¬K ®°¯s± 2.3.2 98:©ª.« U /²}³sU i ´ 100% 1$(8G D Eµ¶OU HI ¤· q t U¸ Hs I¨ D.ELsM h ¤F · J ¹º 2.0 psi Ua~ J Q 125Hz 6 u&v ^ . U D.Eµ ¤¶· O q6 » /²}³ h Fn¼½LMU¾Mb ^ . U*D.Eµ¶O DaEsF ¿À(*YÁ¨~ÂÃ. Table 1 Design and operation data Item Value Power Output(MW) Fuel Flow rate(kg/s) TIT( ) Equivalent ratio Combustion chamber size (simplify), cm 1L Mode, Hz from equation (2) 1684. 80 5.19 1,027 0.6 200x3,100 136.

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(38) b Ah°W ÉYZ £V{Êy Z_[ ZË_ . Ì Í 1). .. {4). .. .. Fig. 5. ,. , NOx .. 125Hz 2.0 psi. (Fig. 5. ),. 0.5 psi .. NOx. 72ppm@13%O2. 80ppm@13%O2. . 100ppm. 140 120. MW, Hz. 100 80 60 40 20 0 16:14:53. çæ çæ çæ çæ çæ çæ çæ çæ çæ çæ ç æ çæ çæ çæ çæ çæ çæ çæ çæ çæ çæ ç æ çæ çæ çæ çæ çæ çæ çæ çæ çæ çæ ç æ çæ çæ çæ çæ çæ çæ çæ çæ çæ çæ ç æ çæ çæ çæ çæ çæ çæ çæ çæ çæ çæ ç æ çæ çæ çæ çæ çæ çæ çæ çæ çæ çæ ç æ çæ çæ çæ çæ çæ çæ çæ çæ çæ çæ ç æ çæ çæ çæ çæ çæ çæ çæ çæ çæ çæ ç æ çæ çæ çæ çæ çæ çæ çæ çæ çæ çæ ç æ çæ çæ çæ çæ çæ çæ çæ çæ çæ çæ ç æ çæ çæ çæ çæ çæ çæ çæ çæ çæ çæ ç æ çæ çæ çæ çæ çæ çæ çæ çæ çæ çæ ç æ çæ çæ çæ çæ çæ çæ çæ çæ çæ çæ ç æ 16:22:05. Power(MW) NOx(ppm) Combustion dynamics(psi) Combustion dynamics(Hz). qG Î ÏÑÐqÒ&ÓÔ A%Õ ÏÖÐ G Î×@Ø Ð t IÙW ¾ Ó ÚÛ ÖÜ Z^QR d kQØÞÝqß _. 7 6. .. 5 4 3. psi. .. 2 1. 16:29:17 Time. 16:36:29. 0 16:43:41. > ? @AB CED F GHI OQPRS GQHTVUW X Y(ABB Z[ 11N \] ZVJ^K _ L. M )N` a b A c&d @Vef ghYP iVj GHTUW k HlmI no Gqp rst uYW vo GHT U W wkZ%^_ . xy{z| }~ _ ~ _ . 4.. 1685. àâáâãåä (1) Richards, G. A., Gemmen, R. S. and Yip, M, J., 1998 "A Test Device for Premix Gas Turbine Combustion Oscillations" J of Engineering for Gas Turbine and Power, Vol.120, p.294-302, (2) Rayleigh, J. S. W., 1945 "The Theory of Sound", Dover, New York, Vol.2, p.226 (3) E. Laudien, R. Ponggratz, R. Pierro and D. Preclik, "Experimental Procedues Aiding the Design of Acoustic Cavities" AIAA paper, 1994 (4) T. Lieuwen, H. Torres, C. Johnson, B. T. Zinn, 2001 "A Mechanism of Combustion Instability in Lean Premixed Gas Turbine Combustors", J of Engineering for Gas Turbine and Power, Vol.123, p.183.

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