CBM is naturally created during the geologic process of converting plant material to coal (coalification). … Removing the ground water from the formation is necessary to produce CBM, as the water removal reduces the pressure and allows the methane to release from the coal to produce flowing natural gas.
How is coal bed methane formed?
CBM is formed during the process of coalification by transformation of plant material into coal. It is generated by either a microbiological or thermal process as a result of increasing heat at greater depth during coal formation. The coal seams are often saturated with groundwater at high pressure.
Where is coal bed methane found?
What is coal bed methane and why is it controversial?
The controversy surrounding coal bed methane extraction has to do with the use of water during the process and its impact on global climate change. Coal bed methane exploration involves pumping large volumes of water out of coal seams to reduce the hydrostatic pressure and liberate the gas.
Is coal bed methane natural gas?
When the coal and methane conversion process occurs such that the coal is saturated with water and methane is trapped within the coal, the result is “coal bed methane.” Coal bed methane (CBM) is the same compound as natural gas, just derived from a different geologic situation.
Does coal regenerate?
“Coal takes longer to form than any other rock type,” says Bailey. … But these coal seams won’t be ready for a few million years. “Industrial use of fossil fuels producing carbon dioxide faster than the ocean can dissolve it or plants store it, will regenerate tropical coal-forming conditions.
Why is coal seam gas so controversial?
Coal seam gas (CSG) is a polarising issue in some communities. Proponents argue that CSG is a vital energy resource, necessary for continued gas supply. Opponents claim that CSG could have serious environmental and social impacts.
Does burning coal release methane?
This means the more natural gas is used, in place of coal, to generate electricity or instead of gasoline to fuel cars, trucks and buses, the less greenhouse gas emissions and smog related pollutants are produced. However, methane that is released into the atmosphere before it is burned is harmful to the environment.
Is methane a liquid or gas?
At room temperature and standard pressure, methane is a colorless, odorless gas. The familiar smell of natural gas as used in homes is achieved by the addition of an odorant, usually blends containing tert-butylthiol, as a safety measure.
Can Methane be extracted from the atmosphere?
This methane joins methane from other sources, such as landfills, livestock and exploitation of fossil fuels. The main mechanism for removal of methane from the earth’s atmosphere is oxidation within the troposphere by the hydroxyl radical (OH).
Why is methane called sweet gas?
It is called ‘sweet gas’ because it does not contain any hydrogen sulphide. The gas often contains up to a few percent of carbon dioxide. In the past, coalbed methane was often the cause of numerous explosions in underground mines.
How do you extract gas from coal?
The process involves pumping oxygen and steam through a small borehole into the coal seam to produce a small and controlled combustion. Unlike coal-bed methane, therefore, the actual coal is converted from a solid state into gas.
What is fire ice?
Fiery Ice. Methane hydrate is often called “fiery ice.” Methane hydrate looks like an ice, and starts burning when an open flame is brought close to it; hence the name. Only water is left after combustion. It is a strange substance.
How is coal formed?
Coal is formed when dead plant matter decays into peat and is converted into coal by the heat and pressure of deep burial over millions of years.
What is coal mine methane?
Coal mine methane (CMM) refers to methane released from the coal and surrounding rock strata due to mining activities. In underground mines, it can create an explosive hazard to coal miners, so it is removed through ventilation systems.
What are methane hydrates for?
However, it is also thought that fresh water used in the pressurization of oil and gas wells in permafrost and along the continental shelves worldwide combines with natural methane to form clathrate at depth and pressure, since methane hydrates are more stable in fresh water than in salt water.