ࡱ>  bbjbjVV }<<תFFpPIII$mmmP\m$ % % %%)*tvvvvvv$˥m^Ij+%%j+j+II % %kZZZj+I %I %tZj+tZZ %( mJ 4`0t˨JV˨h˨Ij+j+Zj+j+j+j+j+Wj+j+j+j+j+j+j+˨j+j+j+j+j+j+j+j+j+F O:SVEU ILI`TE U RIJECI POMORSKI FAKULTET U RIJECI RIJEKA IVANA MIKLI I BARBARA MILANOVI SUSTAVI ZA REDUKCIJU EMISIJE ISPU`NIH PLINOVA MOTORNIH VOZILA SEMINARSKI RAD Rijeka, 2011. SVEU ILI`TE U RIJECI POMORSKI FAKULTET U RIJECI RIJEKA SUSTAVI ZA REDUKCIJU EMISIJE ISPU`NIH PLINOVA MOTORNIH VOZILA SEMINARSKI RAD Predmet: Upravljanje dobavnim lancem Mentor: Prof. dr. sc. Dragan iai Ime i prezime: Ivana Mikli - 0112029192 Barbara Milanovi - 2419001334 Smjer: Logistika i menad~ment u pomorstvu i prometu Rijeka, velja a 2011. SADR}AJ stranica  TOC \o "1-3" \h \z \u  HYPERLINK \l "_Toc285540114" 1. UVOD  PAGEREF _Toc285540114 \h 1  HYPERLINK \l "_Toc285540115" 2. VRSTE ISPU`NIH PLINOVA CESTOVNIH MOTORNIH VOZILA  PAGEREF _Toc285540115 \h 2  HYPERLINK \l "_Toc285540116" 2.1 Nekodljivi sastojci ispunih plinova  PAGEREF _Toc285540116 \h 2  HYPERLINK \l "_Toc285540117" 2.2 kodljivi sastojci ispunih plinova  PAGEREF _Toc285540117 \h 3  HYPERLINK \l "_Toc285540118" 2.2.1 Ugljik (II) oksid  PAGEREF _Toc285540118 \h 3  HYPERLINK \l "_Toc285540119" 2.2.2 Ugljikovodici  PAGEREF _Toc285540119 \h 3  HYPERLINK \l "_Toc285540120" 2.2.3 Duai ni oksidi  PAGEREF _Toc285540120 \h 4  HYPERLINK \l "_Toc285540121" 2.2.4 Sumpor (IV) oksid  PAGEREF _Toc285540121 \h 4  HYPERLINK \l "_Toc285540122" 2.2.5 Olovo i njegovi spojevi  PAGEREF _Toc285540122 \h 4  HYPERLINK \l "_Toc285540123" 2.2.6 aa i dim  PAGEREF _Toc285540123 \h 4  HYPERLINK \l "_Toc285540124" 3. U INCI ONE I`ENOG ZRAKA  PAGEREF _Toc285540124 \h 5  HYPERLINK \l "_Toc285540125" 3.1 U inak na ovjeka  PAGEREF _Toc285540125 \h 5  HYPERLINK \l "_Toc285540126" 3.2 U inak na vegetaciju  PAGEREF _Toc285540126 \h 6  HYPERLINK \l "_Toc285540127" 3.3 U inak na materijale  PAGEREF _Toc285540127 \h 7  HYPERLINK \l "_Toc285540128" 4. SUSTAVI ZA REDUKCIJU ISPU`NIH PLINOVA  PAGEREF _Toc285540128 \h 8  HYPERLINK \l "_Toc285540129" 4.1 Usporedba benzinskih i dizelskih motora  PAGEREF _Toc285540129 \h 8  HYPERLINK \l "_Toc285540130" 4.2 Zahvati unutar i izvan benzinskih motora  PAGEREF _Toc285540130 \h 9  HYPERLINK \l "_Toc285540131" 4.2.1 Katalizatori  PAGEREF _Toc285540131 \h 9  HYPERLINK \l "_Toc285540132" 4.2.2 Lambda sonda  PAGEREF _Toc285540132 \h 12  HYPERLINK \l "_Toc285540133" 4.3 Mjere za redukciju tetnih tvari unutar dizelskih motora  PAGEREF _Toc285540133 \h 13  HYPERLINK \l "_Toc285540134" 4.4 Mjere za redukciju atetnih tvari izvan dizelskih motora  PAGEREF _Toc285540134 \h 14  HYPERLINK \l "_Toc285540135" 4.4.1 Termi ke reakcije  PAGEREF _Toc285540135 \h 15  HYPERLINK \l "_Toc285540136" 4.4.2 Kataliti ke reakcije  PAGEREF _Toc285540136 \h 15  HYPERLINK \l "_Toc285540137" 4.4.3 Pro iaavanje plina od estica  PAGEREF _Toc285540137 \h 16  HYPERLINK \l "_Toc285540138" 5. ZAKLJU AK  PAGEREF _Toc285540138 \h 17  HYPERLINK \l "_Toc285540139" POPIS SHEMA  PAGEREF _Toc285540139 \h 19  HYPERLINK \l "_Toc285540140" POPIS SLIKA  PAGEREF _Toc285540140 \h 19  HYPERLINK \l "_Toc285540141" POPIS TABLICA  PAGEREF _Toc285540141 \h 19  1. UVOD Primjenom motornih vozila dolazi do poveanja emisije ispuanih plinova koji atetno djeluju na okolia. Upotrebom sustava za redukciju ispuanih plinova smanjuje se emisija ispuatenih atetnih plinova u okolia. Predmet ovog istra~ivanja je istra~iti i utvrditi mogue na ine redukcije emisije ispuanih plinova, te njihov u inak. Prethodno navedeni problem istra~ivanja ima dva objekta, a to su: emisija ispuanih plinova motornih vozila i sustavi za njihovu redukciju. Ovim radom ~eli se utvrditi ispravnost postavljene hipoteze: zbog upotrebe motornih vozila dolazi do one iaenja okoliaa ispuanim plinovima, te pomone hipoteze: atetni utjecaj ispuanih plinova na okolia mogue je smanjiti primjenom sustava za njihovu redukciju. Cilj istra~ivanja je utvrditi u kojoj mjeri ispuani plinovi iz motornih vozila utje u na oneiaenje okoliaa, te istra~iti u inkovitost sustava koji se koriste za smanjenje tog one iaenja. U istra~ivanju problema koriatene su znanstvene metode kao ato su: metoda analize i sinteze, metoda indukcije i dedukcije, statisti ka metoda te metoda deskripcije. Rad je, pored uvoda i zaklju ka, podijeljen u tri poglavlja. U prvom poglavlju, pod nazivom "Vrste ispuanih plinova cestovnih motornih vozila", dan je pregled neakodljivih i akodljivih sastojaka ispuanih plinova, njihove karakteristike i mogui utjecaju na okolinu i zdravlje ljudi. Drugim poglavljem, koje nosi naziv "U inci one iaenog zraka", obrauje se negativan u inak ispuanih plinova na ovjeka, vegetaciju te materijale. Tree se poglavlje, pod nazivom "Sustavi za redukciju ispuanih plinova", bavi samim problemom ovog rada, a to je istra~iti na koji se na in vrai redukcija ispuanih plinova kod cestovnih motornih vozila. Za taj se postupak koriste mnoge metode, od kojih su posebno obraene one najzastupljenije, kako za benzinske tako i za dizelske motore. VRSTE ISPU`NIH PLINOVA CESTOVNIH MOTORNIH VOZILA Neo iaeni zrak u osnovi je smjesa duaika, kisika, plemenitih plinova, ugljik (IV) oksida, metana, duai nih oksida, vodika, vodene pare i raznih ugljikovodika. One iaenje zraka mjeri se kao vrijeme koje je potrebno da polovica koli ine one iaiva a koji je emitiran u zrak izae iz atmosfere. To se vrijeme mo~e mjeriti u danima, mjesecima ili ak godinama, ovisno o vrsti one iaiva a. Ako su one iaiva i nastali iz prirodnih izvora, onda se nazivaju primarnima, a ako je doalo do reakcija sastojaka zraka, to su onda sekundarni one iaiva i. Motorna vozila su primarni one iaiva i zraka, a od svih vrsta prometa, cestovni prednja i u one iaenju okoliaa, i to do 80% ukupnog one iaenja okoliaa atetnim sastojcima. Neakodljivi sastojci ispuanih plinova U ispuanim plinovima cestovnih motornih vozila mogu se izdvojiti sljedei neakodljivi sastojci: duaik (N2), kisik (O2), vodena para (H2O) i ugljik (IV) oksid (CO2). Duaik, sa 72,3% volumnog udjela u ispuanim plinovima benzinskog, i ak 76% u onima dizelskog motora, u motor ulazi sa usisanim zrakom, najveim dijelom ne sudjeluje u procesu izgaranja te izlazi iz motora ispuhom. Kisik u motor takoer ulazi sa usisanim zrakom. Jedan je od glavnih sudionika procesa izgaranja, a njegova prisutnost u ispuanim plinovima posljedica je nepotpunog izgaranja, u slu aju loaeg mijeaanja gorive smjese. Poato smjesa nije dobro izmijeaana, javlja se podru je bogate i siromaane smjese, a kada kisik prijee iz bogate u siromaanu smjesu, njegova koli ina se poveava, poato goriva ima manje od zraka pa sav kisik ne sudjeluje u izgaranju. Vodena para produkt je svakog procesa izgaranja, a u cestovnim motornim vozilima nastaje oksidacijom ugljikovodika s kisikom iz usisanog zraka. Ugljik (IV) oksid neotrovan je plin, izravno neakodljiv, ali pridonosi u inku staklenika na Zemlji (u njegovom stvaranju sudjeluje sa ak 50%), zbog ega dolazi do poveanja njezine temperature. Isto tako, utje e na stvaranje 'kiselih kiaa', koje uniatavaju biljni svijet. U odnosu na druge vrste prometa, va~no je napomenuti da na cestovni promet otpada 80% one iaenja zraka ugljik (IV) oksidom. S obzirom na to da ovaj plin nastaje izgaranjem nafte, kao i zemnog plina, ne postoji tehnologija koja bi omoguila njegovo uklanjanje iz ispuanih plinova, ve je potrebno smanjiti potroanju navedenih goriva i okrenuti se uporabi alternativnih. `kodljivi sastojci ispuanih plinova Kada bi se u motorima odvijalo potpuno izgaranje, rezultat bi bili samo ranije navedeni neakodljivi ugljik (IV) oksid, vodena para i duaik. No, to u stvarnosti nije tako ve je rezultat nepotpunog izgaranja u motorima puno slo~eniji, pa se osim ova tri navedena plina javljaju i mnogi drugi. U akodljive sastojke ispuanih plinova ubrajamo: ugljik (II) oksid (CO), ugljikovodike (CH), duai ne okside (NOx), sumpor (IV) oksid (SO2), olovo (Pb) i njegove spojeve te au i dim. 2.2.1 Ugljik (II) oksid Ugljik (II) oksid, kao produkt nepotpunog izgaranja, u najveoj koli ini prisutan je u podru ju bogate smjese, tj. ato je smjesa bogatija to je njegova koncentracija viaa. Minimalne vrijednosti CO posti~u se za faktor zraka =1 (faktor zraka koli nik je stvarno usisane i teoretski probne koli ine zraka), kada je usisana masa zraka jednaka teoretskoj. Ista koli ina propisana je i zakonom. CO je otrovan plin bez boje i mirisa. Puno je br~i u vezivanju za hemoglobin od kisika, ime smanjuje njegovu sposobnost prenoaenja u krvi. Iz tog razloga, ve i mala koncentracija CO izaziva gubitak svijesti i trovanje, ak i smrt. Zbog njegove velike otrovnosti, ne smije se dopustiti rad motora, odnosno emisija ispuanih plinova u zatvorenim prostorima. Osim negativnog utjecaja na ljudsko zdravlje, ovaj plin ima loa utjecaj i na okolia, zbog ega mu se posveuje i najvea pozornost. 2.2.2 Ugljikovodici Ugljikovodici su, takoer, produkt nepotpunog izgaranja. Sastojci su goriva, koje bi u potpunosti trebalo izgorjeti, ali se u realnim uvjetima izgaranja to nikada ne dogodi, pa se mogu u veoj ili manjoj koli ini nai u ispuanom plinu motornih vozila. Najmanja koncentracija HC posti~e se u podru ju blago siromaane smjese, a ato je smjesa bogatija, to je njihova koncentracija (kao i kod CO) vea. Takoer, i u podru ju naglaaeno siromaane smjese njihova se koncentracija u ispuanim plinovima poveava. Pare ugljikovodika djeluju na sredianji ~iv ani sustav i imaju narkoti ko djelovanje. Niskomolekularni ugljikovodici, koji se nalaze u ispuanim plinovima benzinskih motora, djeluju nadra~ujue, dok su visokomolekularni ugljikovodici, koje nalazimo kod dizelskih motora, toksi ni. Ako se CH pri izgaranju ne oksidiraju, mogu nastati razli iti aromatski spojevi, koji su toksi ni, a posebno treba izdvojiti najtoksi niji, benzen. On kod ovjeka mo~e uzrokovati rak krvi i kostiju te razne tumore. 2.2.3 Duai ni oksidi Duai ni oksidi, koji nastaju izgaranjem goriva pri visokim temperaturama, su duaikov oksid (NO) i otrovan duaikov dioksid (NO2). Kao i prije navedeni plinovi, ovisni su o faktoru zraka. Najvea je koncentracija u podru ju blago siromaane, dok opada u podru ju bogate ili siromaane smjese. Prvi se stvara NO, a zatim NO2, koji brzo prodire u plua gdje se spaja s hemoglobinom i proizvodi spojeve koji blokiraju njegovu normalnu funkciju. Posljedice su smanjenje funkcije dianog sustava i smanjenje otpornosti na infekcije, a u prisutnosti CO ovaj plin izaziva i smrtna trovanja. 2.2.4 Sumpor (IV) oksid Sumpor (IV) oksid nalazi se u deset puta veoj koncentraciji kod dizelskih u odnosu na benzinske motore, zbog poveane koli ine sumpora u dizelskom gorivu. Ovaj plin nepovoljno djeluje na ovjeka i biljke te uzrokuje koroziju. Natalo~eni sulfati atetno djeluju na ljude, poato ih ovjek udiae u obliku vrlo sitnih estica koje plua ne mogu iskaaljati. Joa se jedna opasnost o ituje u tome ato sumpor (IV) oksid u atmosferi oksidira u SO3, koji u kontaktu s vodom prelazi u sulfatnu kiselinu, ato rezultira nastankom 'kiselih kiaa'. 2.2.5 Olovo i njegovi spojevi Olovo i spojevi olova dodaju se benzinskom gorivu radi poboljaanja otpornosti na detonacije. Radom motora oslobaaju se oksidi olova, koji se tako mogu nai u prizemnim slojevima zraka te one istiti okolia. Olovo, kao i njegovi spojevi, je toksi no, a posebno su osjetljivi fetusi, mala djeca i anemi ne osobe. Da bi se smanjila njegova koncentracija u ispuanim plinovima benzinskih motora, uvode se bezolovni benzini te alternativna goriva. 2.2.6 aa i dim aa i dim javljaju se kao problem kod ispuanih plinova dizelskih motora. aa je filtrat ispuanih plinova, koji se sastoji od estica ugljika, a nastaje uz manjak kisika i visoku temperaturu, zbog nepotpunog mijeaanja goriva i zraka. Ugljikovi spojevi u esticama ae nisu sami po sebi atetni, ali na sebe ve~u razli ite toksi ne tvari. Dim je bitno spomenuti zbog ometanja vidljivosti na prometnicama, ime se smanjuje sigurnost u prometu. 3. U INCI ONE I`ENOG ZRAKA Razli ita su istra~ivanja dokazala da one iaenje zraka loae utje e na cijeli ekoloaki sustav  od oateenja zdravlja ljudi i ~ivotinja i oateenja vegetacije do propadanja materijala, klimatskih promjena i na druge na ine. U ovom e se poglavlju, stoga, posebice obraditi negativan u inak one iaenog zraka na ovjeka, vegetaciju te materijale. U inak na ovjeka Najzna ajnije studije o u incima estica iz one iaenog zraka na zdravlje proveli su ameri ki istra~iva i Schwartz, Dockery i Pope u prvoj polovici 1990-ih. Oni su ustanovili da postoji statisti ki zna ajna veza izmeu poveane koncentracije estica u zraku i stope smrtnosti odnosno zdravstvenog stanja stanovniatva. U inci one iaiva a, ovisno o trajanju izlaganja one iaenju, mogu biti akutni i kroni ni. Akutni se manifestiraju brzo, nakon kratkog izlaganja (najviae do nekoliko dana), dok se kroni ni vide tek nakon duljeg perioda izlaganja, zbog ega ih je i te~e uo iti. Dugotrajna izlo~enost one iaenom zraku mo~e, dakle, izazvati kroni ne bolesti, koje u iznimnim slu ajevima mogu zavraiti i smru. Na utjecaj one iaiva a iz zraka posebno su osjetljiva predakolska djeca, te osobe s kroni nim bolestima plua i srca. estice manjeg promjera opasnije su za zdravlje jer mogu prodrijeti dublje u respiratorni trakt i trajno se natalo~iti u pluima. Zato se potencijalnom opasnoau za ljudsko zdravlje smatraju estice manje od 10 mikrometara. One prolaze kroz gornji dio dianog sustava bez zaustavljanja. Neke se talo~e u bronhijima, a najsitnije prodiru dublje u plua. Dubina prodiranja one iaiva a iz zraka u plua ovisi o njegovoj topljivosti. Oni koji su viae topljivi, kao ato je SO2, apsorbiraju se ve u gornjem dijelu dianog sustava. U sljedeoj tablici prikazani su neki atetni sastojci ispuanih plinova i njihov utjecaj na ovjeka. Tablica  SEQ Tablica \* ARABIC 1 Neke atetne tvari iz zraka i njihovo djelovanje na ljudsko zdravlje `tetna tvarDjelovanje SO2 SO2 + fina praaina NO2 NO CO  nadra~uje diane putove i otapa se u sluznicama o iju, usta, nosa i bronhija poveava atetno djelovanje SO2, prodire do unutarnjih dianih organa gdje se stvara sulfatna kiselina; vea je mogunost kroni nog bronhitisa i povean je rizik akutnih oboljenja dianih putova nadra~uje diane putove i otapa se u sluznicama otrovan, stvara metahemoglobin u krvi ima 200 do 300 puta veu sklonost vezanja za hemoglobin u krvi od O2, nastaje karboksihemoglobin te se sprje ava prenoaenje O2 u krvi i opskrba kisikom; napada sredianji ~iv ani sustav i sustav krvotoka, uzrokuje glavobolje, umor, gubitak snage i smetnje kod spavanja`tetna tvarDjelovanje O3 Pb aa aromatski ugljikovodici nadra~ujui plin za diane putove, prodire u plua i utje e na njihovu funkciju kroz oksidaciju enzima, bjelan evina, aminokiselina, lipida itd.; poveava osjetljivost na infekcije i stvara nadra~aj kaalja djeluje na aktivnost izmjene tvari, utje e na mozak (osobito u male djece), talo~i se u kostima na sebe ve~e toksi ne tvari (NOx, SO2 i kancerogene ugljikovodike) dio ih je kancerogenIzvor: Autori uredili prema Golubi J.(1999), Promet i okolia, Fakultet prometnih znanosti, Zagreb, str. 35 U inak na vegetaciju U usporedbi sa ~ivotinjama i ljudima, biljke su najosjetljivije i prve reagiraju na one iaiva e iz zraka. S obzirom na to, oateenje vegetacije atetnim tvarima iz zraka jedan je od prvih indikatora one iaenja zraka. U inci se mogu manifestirati kao pigmentacijske, kloroti ne i nekroti ne promjene, te morfoloaki u inci. Kod slabijih u inaka dolazi do poremeaja biokemijskih i fizioloakih procesa, zbog kojih se javljaju promjene u rastu biljaka, sposobnosti za razmno~avanjem itd. Kroni ni u inci naj eae rezultiraju promjenom boje liaa, a kod najsna~nijih utjecaja mo~e doi do uginua biljnih vrsta i podbacivanju prinosa. Neki od one iaiva a kojima je uzrok promet, a koji imaju atetan utjecaj na vegetaciju, te njihovo djelovanje, prikazani su u tablici 2. Tablica  SEQ Tablica \* ARABIC 2 U inci nekih one iaiva a na vegetaciju One iaiva Oateenja biljaka SO2 NO2 etilen Praaina  teake smetnje asimilacijskom procesu biljaka, pogotovo igli astom drveu; javljaju se nekroti ne pjege s obje strane liaa javljaju se sli ni simptomi kao i kod oateenja SO2-om, ali potrebne su vee koncentracije; znak trovanja NO2-om je i pojava liaa usred zime zastoj u rastu, smetnje u cvatu, pupanju i listanju - opadanje liaa i mlaih cvjetova, nemogunost otvaranja cvjetova, slabljenje rasta trave, poja ano prizemno grananje za epljenje pora, izolacija topline i svjetla - negativin u inci na rastIzvor: Autori uredili prema Golubi J.(1999), Promet i okolia, Fakultet prometnih znanosti, Zagreb, str. 32-33 `to se aumske vegetacije ti e, najvee je oateenje od zakiseljavanja tla, a atetno djeluju i poveane koncentracije SO2 i ozona jer mogu izazvati oateenje liaa. Za zakiseljavanje tla je u prvom redu odgovorno talo~enje sumpora. Na poljoprivredne usjeve najviae utje e djelovanje one iaiva a preko liaa. `tetni plinovi ulaze u biljku zajedno sa zrakom kroz pore na liau, gdje dolazi do reakcije izmeu one iaiva a i klorofila pri emu se on uniatava, te se javlja poremeaj u procesu fotosinteze. U inak na materijale Izravnim djelovanjem one iaiva a iz zraka na materijale dolazi do njihovog postupnog propadanja zbog kemijskih reakcija koje se pritom javljaju. Na brzinu propadanja i stupanj oateenja utje u koli ina vlage i svjetla te temperaturne promjene. Koli ina vlage u zraku veoma je bitna jer veliki broj atetnih tvari iz zraka reagira s materijalima s kojima doe u kontakt tek u prisutstvu vode. Pod propadanjem materijala podrazumijeva se korozija metala, uniatavanje pro elja zgrada, oateenje slojeva boje na obojenim povrainama i sli no. Takoer, estice koje se emitiraju pri izgaranju fosilnih goriva utje u na materijale kroz zaprljanje povraine. Za velik broj materijala najvee razorno djelovanje ima suho talo~enje SO2. SO2 i kisele kiae oateuju sve materijale koji u sebi imaju lu~natu komponentu, a to su kamen (pogotovo vapnenac) i ~buka. Govorei o metalima, iako vlaga u malim koli inama pospjeauje atetan utjecaj one iaiva a iz zraka, vlaga u veim koli inama, tj. padaline umanjuju brzinu korozije. 4. SUSTAVI ZA REDUKCIJU ISPU`NIH PLINOVA U ovom poglavlju detaljno e se razraditi naj eae metode koje se koriste za redukciju ispuanih plinova, kako kod benzinskih, tako i dizelskih motora. Za obje vrste motora nije mogue koristiti iste metode, a koji su razlozi tome pojasnit e se u daljnjem tekstu. Usporedba benzinskih i dizelskih motora Najvei dio cestovnih motornih vozila ima pogon benzinskim ili dizelskim motorom. U njima se odvija proces izgaranja, tj. pali se usisna smjesa goriva i zraka, prilikom ega nastaju ispuani plinovi. Najzna ajnije atetne tvari u ispuanom plinu su, kako je ve i navedeno ranije u radu, CO, CH, NOx i aa. Kod benzinskih motora atetne tvari mogu nastati zbog hladnog starta, tj. kad motor ima prebogatu smjesu. Isto tako, loae odr~avanje i troaenje nakon velikog broja prijeenih kilometara poveava emisiju CO i CH. Kod vozila s katalizatorom i reguliranom lambda sondom takoer mo~e doi do stvaranja CO i CH, u slu aju bogatog prilagoavanja, ili pak do nastanka NOx, kada je prilagoavanje siromaano. Proces izgaranja kod dizelskog motora dogaa se s viakom zraka, tj. sa siromaanom smjesom, te su zbog toga koncentracije CO i CH relaitvno male. Njihova koncentracija jednaka je koncentraciji kod benzinskog motora s katalizatorom. `to se koncentracije NOx ti e, ona je kod dizelskih motora vea nego kod benzinskih, kao i emisija estica. Za razliku od benzinskih motora, kod dizelskih ne postoji problem olova. U sljedeoj tablici prikazane su neke prednosti i nedostaci benzinskih i dizelskih motora, a na shemi 1 usporedba koncentracije ispuanih plinova. Tablica  SEQ Tablica \* ARABIC 3 Prednosti i nedostaci benzinskih i dizelskih motora Benzinski motorDizelski motorprednosti- jednostavna ugradnja - povoljna uporaba kod punog optereenja - emisija ispuanih plinova utjecajna- povoljna uporaba kod djelomi nog optereenja - dugi vijek trajanja - male emisije CO i CH nedostaci-viaa uporaba kod djelomi nog optereenja - visoka emisija CO i CH - glasan rad motora - emisija aeIzvor: Autori uredili prema `trumberger N.(1995), Novi pristup rjeaavanju smanjenja atetnih djelovanja ispuanih plinova cestovnih motornih vozila- doktorska disertacija, Fakultet prometnih znanosti, Zagreb, str. 25 Shema  SEQ Shema \* ARABIC 1 Usporedba koncentracije ispunih plinova iz dizelskih i benzinskih motora  Izvor: Autori uredili prema Centar za vozila Hrvatske (2004), Ispitivanje ispunih plinova motornih vozila eko test, Drugo izmijenjeno izdanje, Stru ni bilten broj 107, Zagreb, str. 32 Zahvati unutar i izvan benzinskih motora Kako bi se ato viae smanjila emisija atetnih ispuanih plinova kod benzinskih motora, razlikujemo primjenu dvije vrste zahvata, a to su oni unutar i izvan motora. Zahvati unutar motora provode se kako bi se optimizirao proces izgaranja. To su odreeni konstrukcijski radovi na motoru kao ato su postavljanje svjeice centralno u glavi motora, viaeventilska glava motora, dulje preklapanje ventila, zapremnina usisne grane vea od zapremnine motora, dobro raspraivanje goriva u usisnoj grani i sli no. `to se vanjskih zahvata ti e, najairu uporabu imaju sustavi katalizatora, zagrijavanje katalizatora, lambda sonda, opremanje motora boljim sustavima paljenja smjese i sustavima za napajanje te upuhivanje sekundarnog zraka u ispuanu granu. Postoje i druge metode, ali ove su naj eae i najva~nije. Meu njima se posebno isti u katalizatori i lambda sonda. 4.2.1 Katalizatori Svi danaanji benzinski motori opremljeni su katalizatorom. Njihova masovna ugradnja zapo ela je u SAD-u, gdje su od 1980. godine svi novi automobili morali imati ugraen katalizator. Svaki katalizator sastoji se od nosa a i aktivnog katalisti kog sloja koji sad~i plemenite metale platinu, rodij i paladij. Redovito je smjeaten u prvom ispuanom loncu do motora. Zahvaljujui materijalu od kojeg je napravljen, u njemu se odvija kemijska pretvorba atetnih ispuanih plinova u neakodljive plinove. Tako se CO pretvara u neotrovan CO2, HC u H2O i CO2, a NOx se razla~u na O2 i N2. Katalizator ne pro iaava ove plinove u potpunosti, ali transformira se oko 90% atetnih sastojaka. Pri tome se ne troai, a s ozirom na to da plinove pretvara, nema nikakvog filtrata pa ne dolazi do njegovog ispunjenja i ne treba ga esto zamjenjivati. Razlikujemo nekoliko vrsta katalizatora: jednostruki  oksidacijski i redukcijski, dvostruki, regulirani jednostruki ili dvostruki katalizator s trostrukim djelovanjem. Oksidacijski katalizator najjednostavniji je oblik knz D b t  8 H . 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Potreban viaak kisika u ispuanom plinu posti~e se prilagodbom motora ili ubrizgavanjem zraka prije katalizatora. Kao kontakt od plemenitog materijala kod ove se vrste katalizatora koriste platina i paladij. Redukcijski katalizator, za razliku od oksidacijskog, slu~i za pretvaranje NOx u O2 i N2, a za to zahtijeva viaak CO2 i HC. Dvostruki katalizator uklju uje oba prethodno spomenuta katalizatora, s upuhivanjem zraka meu njima. Ispuani plin kod ovih katalizatora prvo prolazi kroz redukcijski katalizator gdje se, uz manjak zraka, vrai redukcija NOx. Nakon dovoenja zraka, ispuani plin prolazi kroz oksidacijski katalizator u kojem se vrai oksidacija HC i CO. Danas se navedeni katalizatori viae ne koriste, ve su isklju ivo u uporabi regulirani jednostruki ili dvostruki katalizatori s trostrukim djelovanjem. To zna i da se u katalizatoru reduciraju sva tri atetna ispuana plina (CO, HC i NOx). Pojam regulirani katalizator ozna ava da se ispred katalizatora nalazi osjetnik koji ra unalu dojavljuje u kojem radnom podru ju motor radi kako bi se smjesa gorivo zrak na ulazu u motor ato je mogue dulje zadr~avala u stehiometrijskom radnom podru ju ( = 1). Ovisno o tome u koliko je kuiata smjeaten, katalizator mo~e biti jednostruk, ako se nalazi u jednom kuiatu, ili dvostruk, ako je podijeljen na dva kuiata. U unutraanjosti katalizatora trostrukog djelovanja nalazi se saasta nosiva struktura kroz koju prolazi ispuani plin. Ta je struktura izraena od keramike (od kristali nog magnezij-aluminijevog silikata) ili, rjee, od metala (valjani limovi od elika). Na keramiku ili metal obavezno se nanosi sloj aluminijskog oksida, kako bi se poveala aktivna povraina. Na sloj oksida nanosi se zatim katalisti ki sloj, u kojem se nalaze plemeniti materijali platina, paladij i rodij. Platina i paladij su vrlo dobri katalizatori za oksidaciju CO i CH, dok se rodij koristi za redukciju NOx. Izmeu kuiata i saaste strukture koja se u njemu nalazi, nalazi se sloj ~i anog ili polimernog pletiva koji tu strukturu pridr~ava i na sebe preuzima eventualne mehani ke udarce, a isto tako kompenzira razli ita temperaturna rastezanja kuiata i samog katalizatora. Na benzinskim motorima s direktnim ubrizgavanjem benzina obavezno se, uz katalizatore trostrukog djelovanja, koriste i NOx akumulatorski katalizatori. Ovakvi motori rade sa siromaanom smjesom pa kvalitetna pretvorba NOx u obi nom katalizatoru trostrukog djelovanja nije mogua. Stoga se koriste posebni katalizatori kod kojih se NOx prvo akumulira, a onda se, pod posebnim programom rada motora, pretvara u duaik i kisik. Da bi katalizator dobro funkcionirao potrebno je zadovoljiti nekoliko uvjeta. Kao prvo, mora biti zagrijan na optimalnu radnu temperaturu koja se kree u rasponu od 400-800C, zbog ega se postavlja ato bli~e motoru kako bi hladna faza rada trajala ato krae. Ali, ako se katalizator zagrije na viae od 800C ili 1000C dolazi do njegovog uniatenja. Da bi se katalizator zagrijao do oko 250C, kada mu je u inkovitost oko 50%, potrebno je oko 150 sekundi. U tom vremenu, dok je motor joa hladan i katalizator neaktivan, koncentracije CO i HC su najvee. Mogua rjeaenja tog problema su: zagrijavanje katalizatora pri pokretanju hladnog motora (elektri nim grija em, plamenikom ili primjenom aktivnog ugljena), primjena metalnog nosa a katalizatora, postavljanje katalizatora bli~e motoru i izolacija ispuanog sustava do katalizatora. Drugi uvjet je taj da motor koji ima katalizator mora raditi s bezolovnim gorivom jer olovo iz goriva trajno uniatava plemenite metale u katalizatoru, bez kojih on ne mo~e funkcionirati. Nadalje, za najveu u inkovitost katalizatora nu~no je osigurati koeficijent viaka zraka  = 1. Za ni~e vrijednosti naglo pada u inkovitost za CO i CH, dok za viae vrijednosti pada u inkovitost za NOx. Trajnost katalizatora ovisi o kvaliteti goriva ( istoi) i uvjetima rada (kvaliteti izgaranja). Ve je spomenuto da se katalizator u svom radu ne troai, ali ipak s vremenom dolazi do starenja - dolazi do okrupnjavanja kristala plemenitih metala i smanjuje se aktivna povraina. '}ivotni vijek' katalizatora se, stoga, procjenjuje na 60-80 000km. Nakon toliko prijeenih kilometara bitno ga je zamijeniti, jer vozilo s neispravnim katalizatorom emitira viae atetnih tvari od onoga bez katalizatora. Na slici 1 mo~emo vidjeti prikaz konstrukcije katalizatora s trostrukim djelovanjem. Slika  SEQ Slika \* ARABIC 1 Katalizator trostrukog djelovanja  Izvor: Golubi J.(1999), Promet i okolia, Fakultet prometnih znanosti, Zagreb, str. 45 4.2.2 Lambda sonda Lambda sonda je danas, uz katalizator trostrukog djelovanja, naju inkovitiji dodatak benzinskom motoru za pro iaavanje ispuanih plinova. Napravljena je od kerami kog osjetnika u obliku cijevi koja je na kraju koji se nalazi u ispuanom plinu zatvorena. Unutarnja strana osjetnika izlo~ena je okolnom zraku, a vanjska strana struji ispuanog plina. Koristi se za mjerenje sad~aja kisika u ispuanom plinu i to no reguliranje faktora zraka (na vrijednost  = 1). Lambda sonda aalje elektri ni signal u upravlja ki sklop sustava za ubrizgavanje i onda se na osnovi informacije koju dobije po potrebi mijenja koli ina ubrizganog goriva. Ukoliko doe do poremeaja vrijednosti faktora zraka (u slu aju premalo ili previae kisika u ispuanim plinovima), lambda sonda aalje signal u upravlja ki sklop sustava za ubrizgavanje. On regulira to ku paljenja i pripremu smjese, kako bi se postigao pravilan omjer zraka i ubrizganog goriva ato rezultira potpunim izgaranjem goriva i dobrim radom katalizatora. Da bi lambda sonda pravilno fukcionirala, mora biti zagrijana na radnu temperaturu. Po inje funkcionirati na oko 350C, a optimalan je rad na oko 800C. Zato se postavlja ato bli~e motoru, kako bi hladna faza rada trajala ato krae, ili se postavlja sonda koja se samostalno zagrijava. Na slici 2 prikazan je rad Lambda sonde i njegova ovisnost o faktoru zraka. Slika  SEQ Slika \* ARABIC 2 Lambda sonda  Izvor: Golubi J.(1999), Promet i okolia, Fakultet prometnih znanosti, Zagreb, str. 53 Postoje dvije osnovne vrste lambda sondi, prema tipu signala koji daju na izlazu. To su dvostupanjska i airokopojasna lambda sonda. Dvostrukom lambda sondom nije mogue odrediti to nu vrijednost faktora zraka. Ona mo~e registrirati samo da li je smjesa u bogatom ( < 1) ili siromaanom radnom podru ju ( > 1), i to tako ato mijenja napon u stehiometrijskom podru ju ( = 1). Ta se promjena koristi kao jedan od signala upravlja koj jedinici motora o tome da li motor radi u podru ju bogate ili siromaane smjese. Za razliku od dvostruke lambda sonde, airokopojasna mo~e precizno odrediti faktor zraka, i to u airokom podru ju rada motora, a ne samo u stehiometrijskom kao dvostruka. `irokopojasna lambda sonda obavezno se ugrauje u benzinske motore s direktnim ubrizgavanjem benzina. Mjere za redukciju atetnih tvari unutar dizelskih motora Kako bi se ato viae smanjila emisija ispuanih plinova, na dizelskom su motoru, kao i kod benzinskog, mogui razni konstrukcijski dodaci ili je mogue dijelove motora oblikovati tako da su ispuani plinovi ato manje one iaeni, uz bolje tehni ke zna ajke motora i manju buku. Sastav ispuanih plinova prije svega ovisi o kvaliteti izgaranja, a kako bi ona bila ato bolja, poduzimaju se odreene mjere, od kojih su najbitnije: po etak dobave i ubrizgavanje goriva, punjenje motora, hlaenje usisanog zraka i povrat ispuanih plinova u usisnu granu. Po etak dobave i ubrizgavanje goriva. Po etak dobave je trenutak kad se gorivo iz visokotla ne pumpe propuata u vodove prema brizgaljkama. Po etak ubrizgavanja trenutak je kad se gorivo po inje ubrizgavati u prostor za izgaranje, tj. cilindre. Sa stajaliata ispuanih plinova, veoma je bitan trenutak kada zapo eti s dobavom goriva. Ako je po etak ubrizgavanja izveden znatno prije gornje mrtve to ke, motor e raditi prili no bu no, uz poveanu potroanju goriva i temperaturu ispuanog plina, zbog ega dolazi do poveane emisije NOx. Ako je pak po etak ubrizgavanja izveden poslije gornje mrtve to ke, postoji mogunost da proces izgaranja nee zavraiti na vrijeme, tj. prije otvaranja ispuanih ventila. Posljedica toga je poveana koncentracija CH i ae u ispuanim plinovima. Optimalan je slu aj kada se po etak dobave namjesti tako da ubrizgavanje zapo ne neposredno prije gornje mrtve to ke, a samozapaljenje u njoj. Kod novih konstrukcija motora, redovito se prije glavnog ubrizgavanja izvodi jedno ili viae predubrizgavanja. Tako se izgaranje odvija uz manje vibracije i buke, a smanjuje se emisija CH i NOx. Punjenje motora odnosno prednabijanje usisanog zraka zahvat je koji se esto koristi kod dizelskih motora. Njime se smanjuje emisija CH, NOx i estica, ali se poveava i snaga motora, poato ona ovisi o mogunosti motora da usiae ato veu koli inu zraka potrebnu za izgaranje, a prednabijanjem se u motor uvla i vea koli ina zraka. Kod cestovnih motornih vozila razlikujemo tri na ina na koja se provodi prednabijanje. To su: dinami ko prednabijanje, mehani ko prednabijanje i prednabijanje ispuanim plinovima. Dinami ko prednabijanje u biti se koristi samo kod benzinskih motora, a funkcionira na principu izmjene duljine usisne grane ovisno o optereenju motora, ime se mo~e postii njegovo prednabijanje. Kod mehani kog prednabijanja kompresor se pokree snagom motora, ato je ujedno i njegova mana jer oduzima snagu motora. Ovakav se na in prednabijanja rjee koristi u novijim konstrukcijama motora. Vrsta prednabijanja koja se naj eae koristi je prednabijanje ispuanim plinovima, kod kojeg se za pokretanje plinske turbine koristi kineti ka energija ispuanih plinova. U ove se sustave obavezno postavlja i regulacijski ventil, da bi se osigurao oprimalni tlak prednabijanja te zaatitili turbina i motor. U slu aju poveanja tlaka u usisnoj grani, ventil omoguava ispuanim plinovima prolaz pokraj turbine. Hlaenje usisanog zraka. Kod prednabijanja temperatura stla enog zraka uvijek se poveava. Taj se zrak stoga nakon turbine hladi, ime se smanjuje toplinsko optereenje motora i temperatura ispuanih plinova, ato sprje ava stvaranje prevelike koncentracije naro ito NOx, ali i estica i CH. Povrat ispuanih plinova u usisnu granu je konstrukcijski zahvat kojim se smanjuje mogunost nastanka NOx, i to tako da se ispuani plinovi dovode natrag na usisnu granu gdje se mijeaaju s istim usisanim zrakom. Tako se smanjuje koncentracija kisika u gorivoj smjesi, ime se smanjuje mogunost nastanka NOx. To se mijeaanje ispuanog plina sa zrakom obavlja posebnim ventilom (EGR ventil). Mjere za redukciju atetnih tvari izvan dizelskih motora Uz prethodno navedene mjere za redukciju atetnih tvari unutar dizelskih motora, postoje i one izvan njega. Ispuani plin mogue je i naknadno obraditi, primjenom jedne od sljedeih metoda: kemijskim reakcijama termi kim kataliti kim pro iaavanjem plina od estica. 4.4.1 Termi ke reakcije Uz visoku temperaturu, u termi kom reaktoru reducira se koncentracija CO i CH. Poato je za rad termi kog reaktora potrebna visoka temperatura ispuanih plinova, koja se ne posti~e u veem dijelu dizelskog motora, nije previae zastupljen u uporabi. 4.4.2 Kataliti ke reakcije Ispuane plinove dizelskih motora mogue je reducirati i katalizatorom, ali, poato dizelski motor radi s velikim faktorom zraka, u podru ju siromaane smjese, nije mogue primijeniti katalizator trostrukog djelovanja. Iz tog razloga koriste se: selektivna nekataliti ka redukcija, selektivna kataliti ka redukcija, neselektivna kataliti ka redukcija, DENOX katalizator i oksidacijski katalizator. Selektivna nekataliti ka redukcija. Uz dodavanje amonijaka, omoguuje smanjenje emisije NOx. Karakterizira je veli ina i slo~enost, zbog ega se koristi kod veih stacionarnih dizelskih motora. Selektivna kataliti ka redukcija. Ova metoda sli na je prethodnoj, a razlikuje se u tome ato se u ovom slu aju, uz dodatak amonijaka za smanjenje emisije NOx, koristi i katalizator. Koli ina amonijaka elektronski se regulira ovisno o re~imu rada motora. I ova metoda primjenu nalazi na velikim dizelskim motorima, koji rade na stacionarnim re~imima. Pri optimalnoj temperaturi (350-400C) i stacionarnom radu motora, koncentracija NOx smanjuje se za viae od 90%. Pri viaim temperaturama dolazi do oksidacije amonijaka i stvaranja NO, a pri ni~im redukcija NOx smanjuje se na svega 40-60%. Shemu primjene selektivne kataliti ke redukcije mo~emo vidjeti na sljedeoj slici. Slika  SEQ Slika \* ARABIC 3 Primjena selektivne kataliti ke redukcije  Izvor: Golubi J.(1999), Promet i okolia, Fakultet prometnih znanosti, Zagreb, str. 61 Neselektivna kataliti ka redukcija. Kod primjene ove metode stupanj pretvorbe NOx manji je nego kod primjene selektivne kataliti ke redukcije. Za njenu uspjeanost potrebna je odreena koli ina CH, ato se posti~e vanjskim ili unutarnjim modifikacijama na motoru. DENOX katalizator. Ovaj katalizator predvien je za rad u podru ju siromaane smjese ( >1). Izraen je od bakra i ~eljeza te omoguuje redukciju NOx za oko 20%. S poveanim udjelom CH u ispuanom plinu, poveava se i njegova mogunost pretvorbe NOx. Stoga se CH koriste i kao redukcijsko sredstvo, dovodi ih se u plinovitom stanju ispred katalizatora. DENOX katalizator mo~e se kombinirati s vraanjem ispuanih plinova u usisnu granu, pri emu dolazi do smanjenja emisije NOx iznad 50%. Oksidacijski katalizator. Ova se metoda naj eae koristi na dizelskim motorima koji se ugrauju na motorna vozila. Oksidacijski katalizatori reduciraju samo CO i CH., ali poato se ugljikovodici mogu pojavljivati i u obliku vrtsih estica, ovakvi katalizatori i njih donekle reduciraju. Za smanjenje emisije NOx, redovito se primjenjuje vraanje ispuanih plinova u usisnu granu. 4.4.3 Pro iaavanje plina od estica Za odvajanje estica iz ispuanog plina koristi se pro ista , a prema na inu djelovanja razlikujemo dvije vrste  pro ista  s povrainskim ili s unutarnjim odlaganjem estica. Povrainski pro ista i imaju male pore na kojima se skupljaju i talo~e estice, za razliku od unutarnjih kod kojih su pore vee te se estice zadr~avaju unutar njih. Nakon odreene koli ine natalo~enih estica, potrebna je regeneracija. Naj eae je u uporabi kerami ko  monolitni pro ista , koji estice zadr~ava na svojoj povraini, a njihovim talo~enjem poveava se stupanj pro iaavanja. Prednosti su ovog pro ista a visok stupanj pro iaavanja, niska cijena, zauzimanje malog prostora te temperaturna izdr~ljivost keramike, dok su njegovi nedostaci talo~enje neoksidirajuih estica ato uzrokuje poveani protutlak u ispuanom sustavu, te sklonost nastajanju pukotina zbog nejednakog temperaturnog optereenja. Prilikom uporabe pro ista a dolazi do talo~enja estica na ili u njemu, ato uzrokuje poveano strujanje ispuanih plinova i poveanje protutlaka, a oboje loae utje e na rad motora. Zamjena pro ista a nije ekonomi na pa se obavlja njegova regeneracija, za ato je potrebna visoka temperatura. Poato ispuani plinovi dizelskih motora u najveem dijelu rada nemaju dovoljno visoku temperaturu, potrebne su dodatne mjere kako bi se osigurala redovita regeneracija. Regeneracija pro ista a mo~e se provoditi unutar motora, vraanjem ispuanog plina u usisnu cijev, priguaivanjem na usisnom sustavu ili predgrijavanjem zraka na usisu, a mo~e se isto tako provoditi i izvan motora. Neke od metoda za regeneraciju izvan motora su: dovoenje topline plamenikom ili elektri nim grija em te primjena aditiva, katalizatora i mikrovalne energije. 5. ZAKLJU AK Napredak ovje anstva dovodi do sve vee potrebe za primjenom motornih vozila, iz ega proizlazi i sve vee zagaenje okoloaa. Upravo zbog velikog opsega zagaenja javlja se potreba za redukcijom ispuanih plinova, te smanjenjam njihova atetnog djelovanja. Ovim radom potvrena je po etno postavljena hipoteza da upotrebom motornih vozila dolazi do one iaenja okoliaa ispuanim plinovima, ato je pojaanjeno i dokazano kroz prethodna poglavlja u kojima je rije  o tvarima koje nastaju procesom rada motora, te o njihovom utjecaju na ovjeka, vegetaciju i materijale. Upotrebom katalizatora i lambda sonde nastoji se smanjiti koli ina akodljivih sastojaka u ispuanim plinovima benzinskih motora, te na taj na in umanjiti njihov atetni u inak. Kod dizelskih se motora zbog razli itog principa rada, te razli itih karakteristika goriva, u istu svrhu upotrebljavaju druk iji principi, kao ato su termi ke i kataliti ke kemijske reakcije, te pro iaavanje plina od estica. U inak navedenih sustava za redukciju ispuanih plinova je zna ajno smanjenje koli ine akodljivih sastojaka u ispuanim plinovima, te time ujedno i zna ajno smanjenje atetnih utjecaja na ovjeka, vegetaciju i materijale, ime je potvrena postavljena pomona hipoteza  atetni utjecaj ispuanih plinova na okolia mogue je smanjiti primjenom sustava koji se koriste za smanjenje tog one iaenja. Ovim radom je ispunjen postavljeni cilj istra~ivanja definiran u uvodu, tj. utvreno je da je utjecaj ispuanih plinova prije pro iaavanja sustavima za redukciju na okolia zna ajan, te da mo~e izazvati mnogobrojne poteakoe u funkcioniranju cjelokupnog ekoloakog sustava, kao ato su na primjer utjecaj na zdravlje kako ljudi, tako i ~ivotinja, te zna ajni atetni utjecaji na vegetaciju i klimatske promjene, kao i na mnogobrojne vrste materijala koje dolaze u doticaj sa ispuanim plinovima motornih vozila. Sagledavajui sve atetne utjecaje do kojih dolazi ispuatanjem akodljivih sastojaka ispuanih plinova motornih vozila, dolazi se do zaklju ka da je uz uspjeanu primjenu postojeih sustava za redukciju, koji su se pokazali prakti nim i u inkovitim, potrebno i dalje razvijati i unapreivati te sustave kako bi se atetni utjecaji sveli na minimum, te na taj na in osigurali daljnje uspjeano funkcioniranje eko sustava. LITERATURA Knjige Dobrovi S.(2006), Podloge za sluaanje predavanja  kolegij 'Ekologija', Tehni ko veleu iliate u Zagrebu, Zagreb Golubi J.(1999), Promet i okolia, Fakultet prometnih znanosti, Zagreb Kova i T.(2000), Troakovi atete u okoliau  magistarski rad, Sveu iliate u Zagrebu, Fakultet elektronike i ra unarstva, Zagreb Ljubas D.(2007), 6. predavanje  kolegij 'Gorivo i mazivo', Sveu iliate u Zagrebu - Fakultet strojarstva i brodogradnje, Zagreb Ru~inski N., Dobrovi S.(2005/2006), Podloge za sluaanje predavanja  kolegij 'Ekoloaka zaatita', Sveu iliate u Zagrebu - Fakultet strojarstva i brodogradnje, Zagreb `trumberger N.(1995), Novi pristup rjeaavanju smanjenja atetnih djelovanja ispuanih plinova cestovnih motornih vozila- doktorska disertacija, Fakultet prometnih znanosti, Zagreb Bilteni Centar za vozila Hrvatske (2004), Ispitivanje ispuanih plinova motornih vozila  eko test, Drugo izmijenjeno izdanje, Stru ni bilten broj 107, Zagreb Internet izvori  HYPERLINK "http://www.factsaboutscr.com/" http://www.factsaboutscr.com/ (04.01.2011.)  HYPERLINK "http://www.iea-coal.org.uk/site/ieacoal_old/clean-coal-technologies-pages/selective-catalytic-reduction-scr-for-nox-control" http://www.iea-coal.org.uk/site/ieacoal_old/clean-coal-technologies-pages/selective-catalytic-reduction-scr-for-nox-control (08.12.2010.)  HYPERLINK "http://www.iea-coal.org.uk/site/ieacoal_old/clean-coal-technologies-pages/selective-non-catalytic-reduction-sncr-for-nox-control" http://www.iea-coal.org.uk/site/ieacoal_old/clean-coal-technologies-pages/selective-non-catalytic-reduction-sncr-for-nox-control (08.12.2010.)  HYPERLINK "http://www.platinummetalsreview.com/pdf/pmr-v16-i3-074-086.pdf" http://www.platinummetalsreview.com/pdf/pmr-v16-i3-074-086.pdf (9.12.2010.) POPIS SHEMA  TOC \h \z \c "Shema"  HYPERLINK \l "_Toc285537127" Shema 1 Usporedba koncentracije ispuanih plinova iz dizelskih i benzinskih motora  PAGEREF _Toc285537127 \h 9  POPIS SLIKA  TOC \h \z \c "Slika"  HYPERLINK \l "_Toc285537115" Slika 1 Katalizator trostrukog djelovanja  PAGEREF _Toc285537115 \h 12  HYPERLINK \l "_Toc285537116" Slika 2 Lambda sonda  PAGEREF _Toc285537116 \h 13  HYPERLINK \l "_Toc285537117" Slika 3 Primjena selektivne kataliti ke redukcije  PAGEREF _Toc285537117 \h 15  POPIS TABLICA  TOC \h \z \c "Tablica"  HYPERLINK \l "_Toc285537104" Tablica 1 Neke atetne tvari iz zraka i njihovo djelovanje na ljudsko zdravlje  PAGEREF _Toc285537104 \h 5  HYPERLINK \l "_Toc285537105" Tablica 2 U inci nekih one iaiva a na vegetaciju  PAGEREF _Toc285537105 \h 6  HYPERLINK \l "_Toc285537106" Tablica 3 Prednosti i nedostaci benzinskih i dizelskih motora  PAGEREF _Toc285537106 \h 8   Golubi J.(1999), Promet i okolia, Fakultet prometnih znanosti, Zagreb, str. 17  Ibidem, str. 17  Ibidem, str. 18  Centar za vozila Hrvatske (2004), Ispitivanje ispuanih plinova motornih vozila  eko test, Drugo izmijenjeno izdanje, Stru ni bilten broj 107, Zagreb, str. 6  Kova i T.(2000), Troakovi atete u okoliau  magistarski rad, Sveu iliate u Zagrebu, Fakultet elektronike i ra unarstva, Zagreb, str. 35  Centar za vozila Hrvatske, op.cit., str. 10  Dobrovi S.(2006), Podloge za sluaanje predavanja  kolegij 'Ekologija', Tehni ko veleu iliate u Zagrebu, Zagreb, str. 27  Ljubas D.(2007), 6. predavanje  kolegij 'Gorivo i mazivo', Sveu iliate u Zagrebu - Fakultet strojarstva i brodogradnje, Zagreb, str. 3  Centar za vozila Hrvatske, op.cit., str. 11  Ljubas D., op.cit., str.3  Ru~inski N., Dobrovi S.(2005/2006), Podloge za sluaanje predavanja  kolegij 'Ekoloaka zaatita', Sveu iliate u Zagrebu - Fakultet strojarstva i brodogradnje, Zagreb, str. 37  Centar za vozila Hrvatske, op.cit., str. 14  Golubi J., op.cit., str . 48  Ibidem, str. 48  Ibidem, str. 46  Centar za vozila Hrvatske, op.cit., str. 16.  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