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Kafe 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0573244 (1975-04-30) |
발명자 / 주소 |
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출원인 / 주소 |
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인용정보 | 피인용 횟수 : 276 인용 특허 : 0 |
Underground strata surrounding a coal seam are prestressed by repeated fracturing with a settable material to strengthen and seal the strata to contain a hydrostatic pressure in the coal seam of about 100 to about 500 atmospheres, thereby providing a gas and liquid-tight seal surrounding and within
Underground strata surrounding a coal seam are prestressed by repeated fracturing with a settable material to strengthen and seal the strata to contain a hydrostatic pressure in the coal seam of about 100 to about 500 atmospheres, thereby providing a gas and liquid-tight seal surrounding and within the coal seam. After the strata surrounding the coal seam and the coal seam itself are sealed, an hydrogenating agent is supplied to the coal seam and is maintained at a temperature of approximately 300 to 500 degrees centigrade and a pressure of from about 100 to about 500 atmospheres to liquefy and hydrogenate the coal in situ. When a region of coal is liquefied out to the boundary of the prestressing, the liquefied coal is pumped out for use.
A method of liquefying coal in situ in an underground coal seam by hydrogenation thereof comprising the steps of supplying an hydrogenating solvent for the coal to the coal seam, maintaining the hydrogenating solvent in the coal seam at a pressure below the overburden stress of the underground strat
A method of liquefying coal in situ in an underground coal seam by hydrogenation thereof comprising the steps of supplying an hydrogenating solvent for the coal to the coal seam, maintaining the hydrogenating solvent in the coal seam at a pressure below the overburden stress of the underground strata and a temperature sufficiently high and a time sufficiently long to hydrogenate a selected volume of the coal in the coal seam and fracturing the underground strata around and in the coal seam with said selected volume of hydrogenated coal, said hydrogenated coal being a fluid at a temperature maintained in the coal seam and settable at a temperature in the strata around the coal seam, thereby to seal the boundary of the coal seam to contain a hydrostatic pressure in the coal seam in excess of the overburden stress.
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