The methane number is an important property of natural gas. This value, which is calculated using an approach by the South West Research Institute, indicates the knocking resistance of the fuel; a methane number of 80 gives the same knocking behavior as a mixture of 20% hydrogen and 80% methane.
Three in-use urban Euro V buses were tested in this study, and they are a CNG bus, an LNG bus and a hybrid-CNG bus. Because many cities in China are promoting natural gas buses, these three vehicles include the existing types of natural gas buses. The main characteristics of the buses and engines are detailed in Table 1. Instrumentation
Compressed Natural Gas can be produced from*. Similar to refilling your gasoline tank, you attach the nozzle from a designated CNG dispenser at a public station. Most public stations are fast-fill, which can fill your tank in about the same amount of time it takes to refuel a gasoline vehicle. CNG cars operate in a similar way to gasoline cars.
How the natural gas is produced has already been discussed in the above-mentioned article. But how will the gas become liquefied? Production of LNG. Liquefied natural gas can be produced by several different processes, but each process has the same essence: compressing and cooling the gas. The most common processes are the following: APCI or
Liquefied natural gas is an odorless, colorless, non-toxic, non-corrosive and non-flammable form of methane. As fuels go, it's pretty cool. Another tanker with the same name sails in the LNG
Natural Gas Vehicle Emissions. When used as a vehicle fuel, natural gas can offer life cycle greenhouse gas (GHG) emissions benefits over conventional fuels, depending on vehicle type, duty cycle, and engine calibration. In addition, natural gas reduces some engine emissions. Tailpipe emissions result from fuel combustion in a vehicle's engine.
Between 2005 and 2022, domestic production of “dry” gas (the very methane-rich natural gas used for energy) almost doubled to over 35 trillion cubic feet per year. 1 During that same period, natural gas eclipsed coal as the largest source of U.S. electricity; in 2022, gas accounted for nearly 40 percent of our electricity generation. 2
International natural gas prices were at or close to all-time highs this report week. Bloomberg Finance, L.P. reports that swap prices for liquefied natural gas (LNG) cargos in East Asia for the balance of the month (December) remained relatively flat at $36.47/MMBtu this report week, the highest weekly average on record going back to January 2020.
Again, the natural gas option could be more expensive than its diesel counterpart and, in this CNG case, there is a chance of 22.51% of the CNG trucks having the same final price per kilometer, even if having a higher maximum purchase price than diesel For the second method, assuming an average resale value of R$125,305.24 (USD 33,866.28), with
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is lng and cng the same
