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They both get injected/burned as gases, the difference is storage. Natural gas is what comes out of the ground, and is a mix of various hydrocarbons, most of which won't liquefy at room temperature and any reasonable amount of pressure. You can process it into ethane, propane, butane and heavier hydrocarbons. Propane and butane can easily be liquefied at room temperature with trivial pressure, so they're sold as different types of LPG; unrefined gas is stored in gaseous form/CNG. They all burn about the same, the difference is with CNG tank pressure decreases as you use up the gas so it requires massive overpressurization in order to maintain the same manifold pressure (a pressure regulator can decrease pressure but not boost it, etc), but is much cheaper because it's not as refined, whereas LNG costs more but maintains a steady, fairly low pressure (just like propane tanks for grills) because as the gas pressure drops, the liquid below boils off until the pressure equalizes again. And yeah vapor pressure drops with temperature, and for CNG the gas just depressurizes as it cools off, so you'd hit a point where you can't get useful fuel pressure, since these systems rely on tank pressure and typically don't have a fuel pump of any kind. Dunno what the deal is with the enclosed/undergound thing, it's a hydrocarbon just like gasoline, dunno why it would be more of a hazard.
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Jan 26, 2016 16:11
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| # ¿ May 6, 2024 10:58 |
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