Mining or in situ disintegration of hard material – Tunnel recovery of fluid material
Patent
1977-04-14
1978-05-02
Fisher, Richard V.
Mining or in situ disintegration of hard material
Tunnel recovery of fluid material
48202, 48204, 48DIG6, 166261, 166263, 166266, C10J 500
Patent
active
040871304
ABSTRACT:
Process for the gasification of coal in situ comprising driving shafts or tunnels into a coal seam, injecting air into the bore holes to ignite and burn the coal to raise its temperature ceasing the flow of air when the coal is hot enough to support the endothermic water gas reaction, and injecting steam into the hot coal formation, such steam preferably being preheated by the flue gases taken from the same end of the bore holes where the air was injected, and recovering product gases, including carbon monoxide and hydrogen, and also product oil, exiting the tunnel at the other end of the bore holes. When the temperature of the coal drops during injection of steam to a level which will just permit combustion, the steam flow is stopped, and the cycle is repeated by air injection and flue gas removal at the front end of the bore holes, and through the tunnel connected therewith. This cyclic process is repeated until the entire mass of coal within the area encompassed by the bore holes is exhausted.
REFERENCES:
patent: 1913395 (1933-06-01), Karrick
patent: 2786660 (1957-03-01), Alleman
patent: 3017168 (1962-01-01), Carr
patent: 3298434 (1967-01-01), Graham
patent: 3358756 (1967-12-01), Vogel
patent: 3809159 (1974-05-01), Young et al.
patent: 3865186 (1975-02-01), Hippel
"Underground Gasification of Coals," Chekin et al., Transactions of Chem. Engr. Cong. of World Power Conf., 3-1936.
"Subterranean Gasification of Coal" Nusinov, Canadian Chemistry and Process Industries, Jun. 1946.
Fisher Richard V.
Geldin Max
Kratz Peter F.
Lane William G.
Occidental Petroleum Corporation
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