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CONSIDERATII PRIVIND FOLOSIREA BIODIESELULUI LA MOTOARELE DIESEL



CONSIDERATII PRIVIND FOLOSIREA BIODIESELULUI LA MOTOARELE DIESEL

Pentru a evita orice confuzie sau interpretare gresita, inainte de a vorbi despre instructiunile New Holland cu privire la folosirea bio-diesel-ului si despre situatia utilizarii acestuia in lume este important sa definim exact bio-diesel-ul.
     Cei mai cunoscuti combustibili bio-diesel, denimiti generic ca esteri metilici ai acizilor grasi sunt:
- Esterul metilic al uleiului de rapita (cultura preferata in Europa de Nord) si
- Esterul metilic al uleiului de soia (cultura preferata in Europa de Sus).
In unele tari sunt folosite si alte denumiri:
- Ester metilic de ulei vegetal si
- Ester de acid gras mono-alchilic
In Europa se aplica pentru biodiesel standardul EN 14214, care stabileste calitatea combustibilului cu privire la impuritati si filtrare, desi unele tari au si standarde proprii pentru biodiesel: Austria: ON C1191/1997, Cehia: CSN 6507/1998, Franta: Journal Officiel 09/1997, Germania: DIN V 51606/09.1997, Italia:UNI 10635/1997, Suedia: SS 155436/1996. In SUA se aplicaASTM D-6751/2002.
Este posibil sa se foloseasca bio-diesel drept combustibil alternativ singur sau de obicei in amestec cu combustibil diesel fosil traditional.
Desi este posibila amestecarea bio-diesel-ului in orice proportie, New Holland s-a concentrat pe trei clasificari: B5, B20, si B100, care indica procentul de biodiesel, respectiv 5%, 20% sau 100%.
New Holland foloseste o multitudine de motoare, toate avand rapoarte “B”pana la B100. Procentul de dilutie este direct afectat de temperatura ambianta (de exemplu, la temperaturi reduse procentul de bio-diesel trebuie sa fie mai redus).
New Holland a acceptat folosirea bio-diesel-ului in diferite rapoarte, pentru care a dat aprobare totala sau conditionata. In cazul aprobarii conditionate trebuie urmate anumite instructiuni, urmand indeaproape specificatiile EN 142154.
Bio-diesel-ul fata de combustibilul fosil traditional
Bio-diesel-ul se poate folosi atat la motoarele obisnuite concepute pentru combustibil fosil (cu pompa de injectie) cat si la motoarele common rail. Totusi multi producatori recomanda folosirea B5 sau B20 in special la motoarele diesel mai moderne, comon rail. Totusi multi producatori recomanda folosirea B5 sau B20 in special la motoarele diesel mai moderne, comon rail.
Datorita naturii sale bio-dieselul incepe sa-si schimbe proprietatile la 00C si si de la   – 40C incepe sa se gelifieze si sa inghete. Prin urmare este necesara adaugarea de aditivi in combustibil pentru a creste rezistenta acestora la inghet.

Consumul de combustibil
In cazul folosirii bio-diesel-ului consumul de combustibil creste cu 0,5 pana la 3%.

Functionare
Cea mai mare problema la folosirea bio-diesel-ului este continutul de apa in combustibil. Extragerea impuritatilor din combustibil se face prin trecerea apei prin acesta. Apa trebuie extrasa apoi in faza de productie. De asemenea bio-diesel-ul atrage apa intr-o cantitate mai mare decat combustibilul diesel fosil traditional si ca urmare, apa trebuie drenata zilnic pentru a asigura functionarea buna a motoarelor si a evita deteriorarea sistemelor de injectie. Cand se utilizeaza combustibil B100 este nevoie sa se foloseasca sisteme de filtrare imbunatatite.

Performante
In cazul folosirii bio-diesel-ului puterea motorului poate fi redusa cu 10-20% fata de specificatiile producatorului, in functie de procentul de bio-diesel utilizat.

Intretinerea tehnica
Ca la orice motor cu combustie interna, o mica cantitate de combustibil migreaza in sistemul de ungere al motorului. Folosind B100, cantitati mai mari de alcool/solvent/combustibil vor intra in sistemul de lubrifiere a motorului. Acest lucru reduce proprietatile de ungere ale uleiului si, ca rezultat, majoritatea constructorilor de motoare recomanda schimbarea filtrelor si uleiurilor de doua ori mai des decat in cazul utilizarii motorinei. Rar aceasta regula se aplica in cazul folosirii combustibililor B50 sau B20. Continutul de alcool in bio-diesel poate afecta negativ unele motoare mai vechi. Conductele de cauciuc si unele garnituri pot fi distruse si necesita inlocuirea.

Impactul asupra mediului inconjurator
Beneficii ale folosirii bio-diesel-ului:
- reducerea cu 100% a emisiilor de bioxid de carbon
- reducerea cu 100% a bioxidului de sulf
- reducerea cu 40-60% a emisiilor de funingine
- reducerea emisiilor de hidrocarburi.
Cantitatea emisiilor de oxizi de azot (NOx) depinde de tipul bio-diesel-ului, de aplicatie si de vechimea vehiculului, dar de regula, emisiile de oxizi de azot sunt mai mari decat la combustibilul diesel traditional.
Combustibilul bio-diesel emite numai bioxidul de carbon care este absorbit in timpul cresterii culturii, de aceea, nu are impact negativ asupra ciclului carbonului.
Transesterificarea
Uleiul vegetal simplu nu poate fi folosit direct ca inlocuitor al combustibilului diesel fosil, iar daca se foloseste, el poate produce deteriorari serioase ale motoarelor. Datorita vascozitatii relativ ridicate a uleiului vegetal simplu atomizarea acestuia este redusa, combustia incompleta prajind injectoarele si cauzand “arderea” (carbonizarea) segmentilor si acumularea de combustibil in uleiul de ungere.
Cea mai buna metoda pentru rezolvarea acestei probleme este transesterificarea uleiului.
In concluzie, New Holland este primul producator de masini agricole care recunoaste potentialul bio-diesel-ului si incurajeaza folosirea lui in procent de 100% la motoarele CNH cu sistem de injectie mecanic si in amestec B5 si B20 (care corespunde cu standardul EN 14214) la toate motoarele, inclusiv la cele cu sistem de injectie common rail. Si aceasta fara modificari la motor, insa tinand cont de precautiile si cu conditia respectarii conditiilor de intretinere tehnica prezentate mai sus. Chiar si un numar de motoare electronice pot functiona cu combustibil bio-diesel B100 cu specificatiile conform standardului EN14214, folosind un kit de adaptare si urmand programul de intretinere specific.

 Azi, prin simpla respectare a indicatiilor New Holland clientii sai pot folosi cu incredere100% bio-diesel pe nu mai putin de 70 de modele de tractoare si combine.
In spatele acestei hotarari care deschide noi perspective clientilor New Holand stau ani de incercari intensive pentru a evalua performantele si fiabilitatea motoarelor. New Holand a dorit sa fie sigura ca poate oferi nu numai cele mai bune tehnologii, dar mai presus de orice, sa asigure clientii sai ca pot sa foloseasca cu incredere si fara probleme combustibilul biodiesel. Fermierii pot beneficia acum in doua moduri de avantajele bio-diesel-ului: pe deoparte folosind combustibilul care reduce dependenta energetica si pe de alta parte prin cultivarea plantelor din care se produce bio-dieselul.
Se poate spune ca New Holland este cu adevarat leader al acestei revolutii pasnice, fiind implicat cu mandrie in promovarea si adoptarea pe scara larga a acestui combustibil alternativ produs din culturi naturale.



Data adaugarii: 26.06.2008 Sursa NHR Agropartners SRL – dr. Ing. Florin Neacsu
   
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