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Methane, CH<sub>4</sub>, is the lightest (least dense) and simplest [[hydrocarbon]]. It is the major constituent of [[natural gas]], and a potent [[greenhouse gas]]. | |||
Many biological processes produce it, and it is produced (intentionally or unintentionally) as a byproduct of [[fermentation]] and [[composting]]. | |||
It may be captured as [[biogas]], or allowed to escape in which case it has a negative impact on the climate. | |||
Although it is a potent greenhouse gas, it does not last as long in the atmosphere as many other such gases, eventually breaking down into [[carbon dioxide]] and [[water vapor]]. | |||
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However, it has many drawbacks as a mass energy source ([[fuel]]). Because it is so ephemeral, it contains relatively little energy per unit volume at easily obtainable pressures. Also due to its lightness, it has a very low boiling point, and it takes tremendous pressure and/or refrigeration to liquefy it. [http://journeytoforever.org/biofuel_library/MethaneDigesters/MD4.html One analysis] indicates that, when compressed adequately to have energy density required by moving vehicles, it actually consumes more energy to compress it than is released in work when combusted. | However, it has many drawbacks as a mass energy source ([[fuel]]). Because it is so ephemeral, it contains relatively little energy per unit volume at easily obtainable pressures. Also due to its lightness, it has a very low boiling point, and it takes tremendous pressure and/or refrigeration to liquefy it. [http://journeytoforever.org/biofuel_library/MethaneDigesters/MD4.html One analysis] indicates that, when compressed adequately to have energy density required by moving vehicles, it actually consumes more energy to compress it than is released in work when combusted. | ||
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Source: [http://www.ecoreality.org/wiki/Methane_digestor Methane digestor] at EcoReality. | Source: [http://www.ecoreality.org/wiki/Methane_digestor Methane digestor] at EcoReality. | ||
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==See also== | ==See also== | ||
Revision as of 19:50, 7 October 2008
Methane, CH4, is the lightest (least dense) and simplest hydrocarbon. It is the major constituent of natural gas, and a potent greenhouse gas.
Many biological processes produce it, and it is produced (intentionally or unintentionally) as a byproduct of fermentation and composting.
It may be captured as biogas, or allowed to escape in which case it has a negative impact on the climate.
Although it is a potent greenhouse gas, it does not last as long in the atmosphere as many other such gases, eventually breaking down into carbon dioxide and water vapor.
However, it has many drawbacks as a mass energy source (fuel). Because it is so ephemeral, it contains relatively little energy per unit volume at easily obtainable pressures. Also due to its lightness, it has a very low boiling point, and it takes tremendous pressure and/or refrigeration to liquefy it. One analysis indicates that, when compressed adequately to have energy density required by moving vehicles, it actually consumes more energy to compress it than is released in work when combusted.
This does not mean it is without use! It can be handy for low pressure, relatively low heat uses, such as mantle lighting or cooking.
Source: Methane digestor at EcoReality.
See also
External links
- Methane digestor at EcoReality.