• LPG - Liquefied Petroleum Gas, which is a mixture of propane and butane. In its raw state, this mixture is odorless. The proportion of this mixture depends on various factors (propane has a better vaporizing capacity and will vaporize at any temperature above - 42°C). LPG is a product of crude oil downstream or directly extracted from oil or gas streams as they emerge from the ground. At drop the pressure this fuel turns into gas phase so it is stored as liquid and combusted as gas. LPG in gas state is heavier than air so when mixed with air it tends to sink towards the ground (that’s why parking LPG powered vehicles is forbidden in underground car parks). LPG physical properties cause that when changing from liquid state - state in which LPG is stored in LPG container, to gaseous state there appears a prominent drop in temperature - here coolness of the reducer body. The duty of the reducer/ evaporator connected to an engine cooling system is also LPG heating enabling its use. The heat given by a car liquid coolant system helps to prevent excessive cooling of the reducer body arising out of gas expansion. When the engine is not working, the reducer valves are closed cutting off the inflow of gas. When the engine is working, the reducer with the help of the control unit Electronic Control Unit adjusts the amount of gas injections.  At a normal driving the difference between petrol and gas is not noticeable, while speeding up the car behaves very well. It is due to the fact that octane rating of gas is higher than of petrol. For Sequential Gas Injection systems any differences are perceptible only in laboratory tests. The other obvious advantage is economical issue - in most countries the price of LPG is half the price of petrol. Another important advantage is ecological issue. Engines running on LPG are much more environment friendly because their emissions do not contain sulphur, benzene, lead, and many fragrant hydrocarbons typical for unleaded petrol.


  • CNG - Compressed Natural Gas is another alternative fuel substitute for gasoline (petrol), diesel, or propane fuel. Its combustion does produce not greenhouse gases so it is a more environmentally clean alternative to those fuels, and it is much safer than other fuels. The natural gas used for NGVs (Natural Gas Vehicles) is the same natural gas that is piped to millions of homes for cooking and heating.
    CNG is made by compressing natural gas (which is mainly composed of methane [CH4]), to less than 1% of its volume at standard atmospheric pressure. It is stored and distributed in hard containers, at a normal pressure of 200–220 bar usually in cylindrical or spherical shapes.Natural Gas is quite simple fuel. Around 90% of natural gas is methane (CH4),which is just one carbon atom with four hydrogen atoms attached. The only simpler fuel is Hydrogen, however till this moment there is no economic methods of creating and distributing large quantities of hydrogen. As a result Natural Gas is going to remain important alternative source of clean energy for some incoming years.
    Compressed Natural Gas is the most common application for NGVs though Liquefied Natural Gas (LNG) use is becoming increasingly common. Natural gas occupies more volume than traditional liquid fuels thus it must be compressed or liquefied to make it practical for transport applications.
    When comparing fuel prices it is important to consider energy content of fuels. CNG is sold either by the kilogram or the cubic meter (m3) and LNG is measured in liters.


  • LNG - Liquefied Natural Gas is natural gas (primarily methane, CH4) that has been converted to liquid form for ease of storage or transport. This process involves removal of certain components, such as water dust, helium, and heavy hydrocarbons, which could cause difficulty downstream. The natural gas is then condensed into a liquid by cooling it to approximately −163 °C (−260 °F).
    The reduction in volume makes it much more cost-efficient to transport over long distances where pipelines do not exist. Where moving natural gas by pipelines is not possible or economical, it can be transported by specially designed cryogenic sea vessels (LNG carriers) or cryogenic road tankers. Octane value of LNG amounts to around 130.
    In comparison with diesel and unleaded petrol all alternative fuels described above are safer to our environment. Harmful substances are almost not present in liquid gases. Besides, in comparison with other kinds of fuel, the harmful exhaust fumes are significantly limited.
Copyright by VERSUS - 2014 | Privacy policy Powered by animativ