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Re: soo, what about CNG? Clean natural gas? how do (archive)

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Posted by Ekkehart Rackete,Bochum Germany on October 11, 2001 at 13:35:31:

In Reply to: soo, what about CNG? Clean natural gas? how do posted by Henry J on October 10, 2001 at 22:25:57:

At the moment CNG (compressed natural gas) is mostly used in cogeneration power plants. A lot of this technology originates in the US. The first gas engines use so called well head gas from the oil wells. They were huge 1 Cylinder Cooper or Ajax engines used to drive the oilpumps in the field. At the moment you find CNG engines mostly in Holland and Germany in city busses. The problem is the high pressure vessel you need and the space it takes. We are talking about 4000 ? psi. So refuling is a poblem, at lower pressure it takes hours. At higher pressure it is at least difficult. You don't need much to produce the comustible mixture. You are dealing with gases already (air + CNG). The rest is special plugs, special oil and very high voltage ingnition systems. And CNG engines run on CNG only. LPG is different. It is liquid, the pressure is low and you need a heated evaporatur etc. But on vehicles you can switch between Gasolin and LPS. You actually start the car on gas and than switch to LPG. You burn about 20% more LPG (volume wise) than gas, but at least in Europe it is much cheaper. Unfortunately nobody wants to convert my M70 engine. Ekkehart

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