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Originally Posted by elhigh
He probably means a diesel truck that has been adapted to use waste vegetable oil. I don't know how it is in Brazil but in the States we have lots of food deep fried, and the oil has to be changed once in a while.
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We also have many deep-fried food in Brazil, but the direct usage of waste cooking oil as an alternative fuel is not so popular back here altough it may be more justifiable from an economy standpoint than biodiesel since it doesn't require the fuel to be chemically altered.
Quote:
Originally Posted by elhigh
A truck converted to use veggie oil (waste or virgin) will have a tank equipped with a heating system to warm the oil, as well as heated fuel lines to keep the fuel hot all the way into the injection pump, and a small auxiliary tank for starting and ending with pure diesel fuel. I understand it's pretty much impossible to start a modern engine on vegetable oil but once everything is hot it works well.
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It actually is possible to start a modern engine on vegetable oil, as long as its pre-heated, which can be done thru a tank-mounted electric heating pad. Some European heavy-duty trucks are fitted with a fuel-heating setup even when they run on regular Diesel fuel, due to gelling issues in cold weather However, the most usual heating setup in the vegetable oil conversions relies on a heat exchanger connected to the engine cooling system which only works after the engine reaches a certain temperature.
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Originally Posted by Hersbird
Right, my propane systems ran on vapors from the luqid propane, technically even gasoline cars run on vapors from the gasoline as well. Liquid fuel no matter what it is has to be converted to a vapor to burn. Also vapor is just another name for gas but means it has gone through a phase change, it was a liquid but now it's a gas.
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The fuel being stratified into very thin drops is not exactly the same as vaporizing it. Also, in LPG-powered forklifts the fuel is used in the liquid phase.
Quote:
Originally Posted by Hersbird
To me propane seems better for storage and for mobile use then CNG but maybe that is old thinking.
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It's all because CNG tanks are heavier and more reinforced due to the higher pressure, but it's not impossible to use Natural Gas at low pressures in stationary applications less sensible to a lower energy density.