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Alternative Fuels An energy source alternative to using fossil fuels. Materials or substances that can be used as a fuel, other than conventional fuels. Waste oils, vegetable oils or animal fats, which can be used alone, or blended with fossil fuels.

Alternative Fuels

Liquified Natural Gas


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  #21  
Old 03-01-2016, 09:45:53 PM
Bill Hazzard Bill Hazzard is offline
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Default Re: Liquified Natural Gas

I saw two UPS semi trucks today and they were powered by liquid natural gas, said so right on the driver door. The pipe coming off the top of the cryo tank was thick with ice.
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  #22  
Old 04-03-2016, 12:54:12 PM
dkamp dkamp is offline
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Default Re: Liquified Natural Gas

Yes, there's quite a few trucking fleets that have been experimenting with CNG and LNG on over-the-road as well as local deliveries in their fleet.

Four years or so ago, one of my company's partners embarked on a project to install NG booster systems and dispensers at their truckstops across the company. Now, when you go to their sites, you'll frequently see an area of the lot set aside and fenced off with concrete walls and bollards, in which is a multi-stage compressor system. They've tapped in a municipal NG line to the booster, which raises the pressure, charges a series of tanks, and then meters it at the dispenser, for fueling trucks.

This is NOT a liquification booster- it doesn't raise pressure high enough, or refrigerate enough to liquify, it just goes to the typical 5000psi or so boost level. The neat thing about CNG boosting, is that unlike bringing in a petroleum pipeline or rolling trucks in, one doesn't need any substantial infrastructure- no large or special NG supply line really. The NG line may be small, but it's feeding the booster pump, which just chugs along, charging a series of larger reservoirs. When a truck hooks to the dispenser, it's filling from the charged reservoirs, which have had ample time to be boosted and cooled (adiabatic being optimal). Until they feed huge volumes of trucks, additional infrastructure won't be necessary. Liquification certainly does.

Both LNG and CNG trucks will exhibit frost around the tank, simply because the expanding gas needs to absorb heat in order to expand.

There's a myriad of opinions on viability of fuels... many waving flags, and many throwing dissent, and oftentimes, much less fact than feelings.

A hundred-and-a-quarter years ago, the byproduct of a then-modern lamp oil distillation process was mostly cast away, or sometimes used for dry-cleaning process, but was considered 'too volatile' for use in any other way. Some guys figured out that it could drive their carriages and bicycles, and some bicycle guys made a powered, human-operated glider, and we burn that same stuff as our most common motor fuel, while lamp oil is basically nonexistant. At same time, some guy named Edison stumbled upon polarized thermionic emmission, and dismissed it as a 'curious, but useless'. Another guy named Fleming took that ball, and ran- making vacuum tube rectifiers, and amplfiers. Now we have microprocessors in our wristwatches, satellites in space.

There is only one thing in this world that is impossible. That is: proving that something is impossible.

Claiming something to be impossible, simply means that one is not willing to make the sacrifices necessary to find success.
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