Method and apparatus for recovering natural gas in a mine
Method and apparatus are disclosed for the recovery and removal of natural gas from a mine by liquefying and collecting the gas within the mine, and then transporting the liquified gas to the surface in a mobile tank. Natural gas is withdrawn from bore holes in a coal mine and liquefied using liquid nitrogen. A unique apparatus permits both the liquid nitrogen and the liquefied natural gas to be contained within a same insulated tank, enhancing the portable characteristics. Liquid nitrogen and its vapor are used to cool the natural gas so as to separate water and CO2. Means are disclosed for controlling the cooling by the cryogenic liquid by regulating the venting flow rate of its vapor in response to the pressure of the liquefied natural gas. The disclosed system eliminates the need for extensive piping and on-site pumping associated with conventional degasification processes.
- Assignee:
- Air Products And Chemicals Inc
- Patent Number(s):
- US 4271676
- OSTI ID:
- 6077596
- Country of Publication:
- United States
- Language:
- English
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012000 -- Coal
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ALKANES
COAL DEPOSITS
COAL MINES
COAL SEAMS
CRYOGENICS
DEGASSING
ELEMENTS
ENERGY SOURCES
FLUIDS
FOSSIL FUELS
FUEL GAS
FUELS
GAS FUELS
GASES
GEOLOGIC DEPOSITS
HYDROCARBONS
LIQUEFACTION
LIQUEFIED NATURAL GAS
METHANE
MINERAL RESOURCES
MINES
NATURAL GAS
NITROGEN
NONMETALS
ORGANIC COMPOUNDS
RECOVERY
RESOURCES
THERMOCHEMICAL PROCESSES