پاورپوینت Gasoline & TEL Replacing Additives In Gasoline
دانلود پاورپوینتGasoline TEL Replacing Additives In Gasoline
| دسته بندی | فنی و مهندسی |
| فرمت فایل | ppt |
| حجم فایل | 2.197 مگا بایت |
| تعداد صفحات | 15 |
Gasoline & TEL Replacing Additives In Gasoline
Contents
Introduction
How lead increases the octane degree?
What is the problem of TEL ?
RFG
TEL substitutes-(Oxygenates): ØMTBE ØETBE ØEthanol
Chemical & physical properties of oxygenates
Introduction
Fuel is combination of different hydrocarbons most of which is comprised of Alkanes. Some hydrocarbons (heptanes) combine with oxygen and burn prior to ignition thus cause:
uShock to engine vDecrease the engine yield wProduce noises like knocking
The octane number of gasoline is the percentage of iso-octane in normal-heptane so the more the proportion of iso-octane is the more calm burning percentage.
How lead increases the octane degree?
•It was discovered in 1992 that if tetraethyl lead is added to fuel the lead and lead oxide (PbO) particles are produced during combustion increasing the octane number causes the gasoline to burn calm and soft and prevent strokes.
•In tetraethyl lead one lead atom is encompassed by 4 Ethyl groups in a tetrahedron coordination. The C-Pb joint is too weak and will easily break by heat creates lead and C2H5 radicals and the combustion process continues with radical reactions.
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