L 20 -ı---t------ -f-----,------,.----l-r-��-----l / j/ 1 8 +-----+------,,..---j+-+-ı",1.-..:._.'----/,.J.-L----______.j .j... / / / 1 6 +---+-+--f--f--f--,,--t\-+-i.-:../___-+------ ----< 1 4 +------+-----+---------+-------l 1,0 F ig. :3 Coıııpressioıı ı·atio withfıırıctioıı excess air ratio F ig. 4 Redııctioıı ofNOx emissioıı of ııcıtııml gas engine by the me of uıater NDx (ppm) 800 600 400 o 5 1,5 2,0 A, o 2,5 of fu l e ehfefeecnc sg oi nne . e hTehge eennegr ai nl es esrevrivc iec ec ocnodnidc ii oc in e oe m x n h i ha s a s u s i s o c b n s e s y e i s n n c e i e m m he p - w r n o a a v c cu e e r d r a, a ld s g i d n a i c s c e i e o n en h g e w i r n e i e l l a a r b n e e d l e r i e r s s s s c d y l u o s c t s e e e m d d p e a h r n e e d s s m a u r h a i o x ze m im d o u s g y m e s n c i e f z m i e r r i , n a a g r e w p u a r s c e e e s d r s d u in o r e s t a . h g Ai e s csayisnteemd .wFiitgh. n4aSruhroawl sgNasOexngt einset .results obSelective cacalytic reduction (SCR): The NOx conversion efficiency depends 10 15 20 % Water content soonme eh ee xatme not uanl sco oofna emh me eoxnhiaauas dc dgea ds caenmdpteo erhateucreacaanlydsto.nIfeNheOamount and accivicy of x reduccions above 30 ac enrd- eur pe ac ot mmeonrte ba yr e e rheeq uS iCr eRd , me xe he ha uo sdc cgaans abfe m e u h s e e e r d a e. l x G c h a a a e u a se s l e y o s u p t s . r T i a o h m r e t m r o e o a b n r e e i i a n a g i n s u p i m n as j b e se c e c d r e o d o f vb i e n a r t s o a e amnedr ae lh eo xe ifdf iecsi eenbcaets coafnc hbees eu sc ea dc a fl yo sr c cs aaerael yds et , Tp ehnedl ea nr rce ro dn eechr eeaes exshwa ui eshc go va se rc ehme apt ienrga caubroe . ve 400-450 ° soning of cacCalyosfte. hNeOcacalyst and with poi x is reduced co N 2 by following reaceion 4 ı--JO + 4 NH3 + 02 = 4 N 2 + 6Hp o s C o i a l n t a i a n s ly h g s e t b s i y s s u , c c r a h e r m b a o a s n r o k a x c a e i b d o l e y u s s i n o c s f o e v m n a s p ni a o ci d n v i e e u n c m t o s p a a o n ni d d a en h m ic e k m e e f o f l. i n c I i i f a e l n i e s c s y s i n e o j h e f a c t n r h e e a d n c i a o n t p c a o t ly i m e s h t u e d m e e x c a r h e m a a u o s s e u t s n . g t I a n o s f , d n je i i c s a c c i h b o a n r r e g o a i f k n e i g n x gc i e n s c t s o h a r em o h u e o g n a h c ia m e r o h e s s e p u h c lt a e s r r i a e n l . y a s m t m an o d Lean cornbustion: Ir ne dc uh ci se s ye shc ee mc, oi nmcbr euasscei oi nn a itre- fmu eple rr aactiuo r teo, wb uhsi tciho nr e dpur oc evsi dNe sOxf oer mr ei sdsui ocnt iso. Ln eiann Nc oOr n x memi xiscsuior enss. wRicehdubcucrinoinngofhigh air-fuel rario NOx emissions hi ga nv iet ebre ea nn da cbcyo me hpel ias ph pe rl i cuas ci ni ogn ao cfocrocnhc-rcoell l vl eedd sfwu ei rl le. cLoenaonmc yo ma tbau ps criioc ne np or ot vmi duec hi mgpr er oa w cc o e e r r rc c e h h - a s c n o e ml c l h ea i g c p n o r i f c o e e b h r l s e e a m sc n a s d n w d so a i r m c d h e e ln r i e g f d e i n u o e c f c . i T o so n h r e n i r n e e spark-plug life. P(PrSeCst)r:atifıed charge cornbustion a Ieh r n e e c i nh n a i c s c r u o s r d y a u s l c c ge e m a d s , i e n c n o t g o ni c e n r h e o e . l l T i e n h d t i a s a k r s e n y o s m c u e a n m n t i s f p o o r l f o d a v o i ir f ddeusceadflfaomrme-accoioonlinogfNefOfecc, resulting in resc carcoi okne , icsaerbbautr ei tc eids ea npgp ilni x c e · a s A b . l T e p h r o i im n s l i a y s r a y co s l m i f m o a u i lr l pr aelr cgeansc ai gn ed uo fs cerhye. cTo chai ls hsoyrssceepron wi se rnoefenda cf uo r increasing ehe incake air capacicy or dera27
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