NOx (ppm) 1000 ı----- / I J \ \ \L CnHm \ \ \ NY 1\ , _____ vr---� 1--ı'- ı:CnHm (ppm) 4000 3500 3000 2500 2000 1500 1000. 500 o 800 600 400 200 � � co (ppm) 0,5 0,4 0,3 0,2 0,1 o ----------V 2 3 Fig. 1 Exhaııst gas mıcılyses /or ııat11rcıl gm cııgiııe 11=2200 RPM x=27 ıııııl!ıyde � "' co /v � I'"' 4 5 6 7 Pe {bar) s e y ra st d e i m tional low pressure gas ınıeceion . NO x concrol meehods are divided ionfc do ecvaeeleogpomr i ee smb af os er da po np lti hc ae ci ri ocnu rr roe nn ta tsut ar tae] gas enginees (1]. 2. OXIDES OF NITROGEN EMISSIONS FROM NATURAL GAS ENGINES There are six common molecular oxides oı xniidereog(NenO: Nicric oxide (Nü), nicrogen dio 2), nicrous oxide (N2 gen trioxide (N O), dinitro2O3), dinierogen eecraoxide (N 2O�) and dinitrogen pentoxide (N2O5). IenmapdridqitliofonrmcwuoladNiffOerent opixes have ehe 3 , but they ar sepn ec cstpr oe scci eosp ai cnadl l yh.aTv eh eo nc wl y o bme eons ti dc e e o n m e t ra i m f n ı o e si n d dmeo(lNe cOu f)aar nodx indi et rs oigneenxdhiaouxsitdae r(eNnOi t r i c o x i 2). refore the term NO Thex in primarily ehe sum of ehese ewo principal nicrogen oxides NO + NO, = NOX Nt e di e r icchoexmi di el urmeaci ne se swc ei tnht o zaonnael yi zne erh. e Th ehai s analyzer is used co deeermine ehe concene- _ rr eaat icoc ni o no feNm Oi e sx l ii gn hatn, we xhhi cahu si st ms c er ea as umr e. dT bh ye a deeeccor. The intensiey oflighe produced risicporoxpidoertiinoneahlecosaemheplceoncemration of nieNO + 03 = NO2 + 02 + light Tt ehl ye cc oa nn cbe me mr aee ai os nu roefdNbOy aa ncdh eNmOi lxu sme pi na er as cem analyzer. The sample passes from ehe hv ee racceerd hsealmd pa lt ea ! iena emepherroaut ug rhe ao ft haeprpmr oa xl icmo na tely 660°C in ehe NO X mode. The NOı is cr eoancvceerdc ewd i ct ho No zOo n, ea nr od gc hi veen ae ht oet taol tNa l ONO i s lue. The sample scream bypasses ehe xehvear mt e ac tl ecdo ni vne re eheed Ne oONmO oidn ee .h Te hs ae mdpi fl feeirse dn ce e becween ehe NOx and NO is ehe N02 cetration. For NO conx measurements in ehe ee xxchraauc esecdgfarsosme s ,e he he ee xs ahma upslees ci rs ecaomn teihn uo s l y rough s Ta a h m h e e p a s l a e e e m d i p s s l c a e o m p n p a v s l e s e r e rs ! e i e d n h e r r . o o A u e g hh p e o h i r n e c a i s o e e e r n u d m o p f e u c n m h rs i p s . and a heared glass fiber fıleer. et hi oenr mo af le hc oe nsvaemr cpe lre we hi rehn e hg oe ees xAeche s s r s m o u ra o g l l h v p e e o n h r e e . Ar efmr eorveehde wt hi rehr ma acl ocl odntvrearpr .e rT, he eh ec lwe aant edr riys ws ahme pr el ei t e hi se mn iexme de rws iethhe orzeoancee ifoonr scuhba sme qbue r ee hn et reexahc ae iuosne . sTa omt apll eNiOs xa cdoinr ec ce rn tmr aetai os un rien mc uerma c iseus b. jTe chce r No sOc a nc do anrcde nmt reaa ts iuorne mi s e anlts oa ca direct measuremene, bue it is subjece to ehe eransienr racio ofNO co NO 2 haust. NO in ehe ex2 concentrations, in addition eo being subject to ehe transienr ratio ofNO co NO 2, w e e n t waor er eolbaeeai ivneeldy al as reghee vd ai flfue er es n, ceeasc hb eoc f 25
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