Dual-Fuel Engine Operation on Alternative Fuels
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The use of propane, n-butane, and liquefied petroleum gas (LPG) as engine fuels has been widely practiced in spark ignition engines, especially for transport applications. These fuels have a number of attractive features, especially since they can be liquefied much more readily than methane, rendering them more easily portable. However, they are less widely available as a cheap alternative fuel resource than natural or biogases. N-butane has a lower octane number and a higher boiling point than propane, which makes it relatively easier to inject in engines as a liquid. In fumigation applications there is a need to ensure the full vaporization of the fuel and to mix it thoroughly with the engine air.