Pulsed in situ retorting in an array of oil shale retorts
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
E21B-043/247
C10B-057/20
출원번호
US-0592378
(1984-03-22)
발명자
/ 주소
Forgac, John M.
Hoekstra, George R.
출원인 / 주소
Standard Oil Company (Indiana), Gulf Oil Corporation
대리인 / 주소
Tolpin, Thomas W.McClain, William T.Medhurst, R. C.
인용정보
피인용 횟수 :
217인용 특허 :
10
초록▼
Greater product yield and quality and continuous upgrading of shale oil with hydrogen-rich, purge mode off gases is attained by pulsing in situ retorts at different phases and intervals. In the process, flow of feed gases to the flame fronts of underground retorts are sequentially stopped and purged
Greater product yield and quality and continuous upgrading of shale oil with hydrogen-rich, purge mode off gases is attained by pulsing in situ retorts at different phases and intervals. In the process, flow of feed gases to the flame fronts of underground retorts are sequentially stopped and purged while continuously retorting the oil shale to enhance transfer of sensible heat from the combustion zones to the retorting zones and enlarge the separation between the combustion zones and the advancing fronts of the retorting zones. The flame fronts can be purged with steam, water, carbon dioxide, nitrogen, hydrogen, combustion mode off gases, purge mode off gases, reactor off gases, or combinations thereof. The combustion mode off gases and/or purge mode off gases can also be used as part of the feed gas or fuel gas.
대표청구항▼
1. A process for retorting oil shale, comprising the steps of: (a) simultaneously heating rubblized masses of oil shale in retorting zones of a plurality of underground retorts to a retorting temperature to liberate hydrocarbons and water from said oil shale leaving retorted shale containing resi
1. A process for retorting oil shale, comprising the steps of: (a) simultaneously heating rubblized masses of oil shale in retorting zones of a plurality of underground retorts to a retorting temperature to liberate hydrocarbons and water from said oil shale leaving retorted shale containing residual carbon; (b) combusting said residual carbon in said oil shale in combustion zones behind said retorting zones in said plurality of underground retorts with flame fronts fed by a feed gas to provide a substantial portion of said heating, said flame fronts advancing generally in the direction of flow of said feed gas; (c) injecting a purge fluid selected from the group consisting essentially of steam, water, nitrogen, carbon dioxide, and combinations thereof, into said plurality of underground retorts to quench said flame fronts and subsequently reigniting said flame fronts with said feed gas while continuing to liberate hydrocarbons and water in said retorting zone; (d) step (b) being performed in at least one of said underground retorts at a time when step (c) is performed in at least one other of said underground retorts; and (e) withdrawing said liberated hydrocarbons and water from said underground retorts. 2. A process for retorting oil shale in accordance with claim 1 wherein said retorting zones have leading edges and said leading edges are advanced when said flame fronts are quenched. 3. A process for retorting oil shale in accordance with claim 2 wherein said leading edges of said retorting zones are spaced a distance in front of said flame fronts and said quenching followed by reignition enlarges said distance. 4. A process for retorting oil shale in accordance with claim 1 wherein said water which is withdrawn from said retorts is recycled and injected into said retorts for use in quenching said flame fronts. 5. A process for retorting oil shale in accordance with claim 1 wherein said feed gas comprises air and a flame front controlling fluid selected from the group consisting essentially of steam, water, recycled off gases, and combinations thereof. 6. A process for retorting oil shale, comprising the steps of: (a) heating portions of rubblized masses of oil shale in retorting zones of a set of underground retorts to a temperature from 800° F. to 1200° F. to liberate hydrocarbons and retort water from said oil shale leaving retorted shale containing carbon residue; (b) sequentially combusting said carbon residue in said retorted oil shale in combustion zones above said retorting zones in said set of underground retorts for selected periods of time with flame fronts supported by a combustion-supporting feed gas containing from 5% to less than 90% by volume molecular oxygen; (c) pulsing and extinguishing said flame fronts in said retorts at different intervals and phases relative to each other with purging fluids selected from the group consisting essentially of nitrogen, carbon dioxide, steam, water, hydrogen, purge mode off gases, combustion mode off gases, reactor off gases, and combinations thereof; (d) igniting said flame fronts in said retorts between pulses of said purging fluids with said feed gas; and (e) withdrawing said liberated hydrocarbons and retort water from said retorts. 7. A process for retorting oil shale in accordance with claim 6 wherein said purging fluid consists essentially of nitrogen. 8. A process for retorting oil shale in accordance with claim 6 wherein said purging fluid consists essentially of steam. 9. A process for retorting oil shale in accordance with claim 6 wherein said purging fluid consists essentially of retort water. 10. A process for retorting oil shale in accordance with claim 6 wherein said purging fluid consists essentially of carbon dioxide. 11. A process for retorting oil shale in accordance with claim 6 wherein said purging fluid comprises water. 12. A process for retorting oil shale in accordance with claim 6 wherein said feed fluid contains from 10% to 30% by volume molecular oxygen. 13. A process for retorting oil shale in accordance with claim 6 wherein the oxygen content of said feed fluid is varied. 14. A process for retorting oil shale, comprising the steps of: (a) forming a series of generally upright modified in situ underground oil shale retorts in subterranean formations of raw oil shale by removing from 2% to 40% by volume of said oil shale from said formations leaving cavities therein, transporting said removed shale to a location above ground for surface retorting, and explosively rubblizing masses of said oil shale substantially surrounding said cavities to form said series of underground retorts; (b) igniting a flame front generally across each of said retorts with a fuel gas; (c) pyrolyzing portions of said rubblized raw oil shale in a retorting zone in each of said underground retorts to liberate shale oil off gases and raw retort water from said raw oil shale leaving retorted shale containing residual carbon, said raw retort water containing oil shale particulates, shale oil, ammonia, and organic carbon; (d) advancing said retorting zone generally downwardly in each of said underground retorts; (e) combusting residual carbon on said retorted shale in a combustion zone above said retorting zone in each of said underground retorts with a flame front; (f) alternately injecting a flame front-supporting feed fluid and a frame front-extinguishing purging fluid selected from the group consisting essentially of steam, purified water, and raw retort water containing oil shale particulates, shale oil, ammonia, and organic carbon, into each of said combustion zones while continuing step (d), said flame front-supporting feed fluid supporting, igniting and propelling said flame front generally downwardly to define a combustion mode of operation, said flame front-extinguishing purging fluid extinguishing said flame fronts and accelerating transfer of sensible heat from said combustion zone to said retorting zones to define a purge mode of operation; (g) alternating operating some of said underground retorts in a combustion mode while operating other of said underground retorts in a purge mode and vice versa; and (h) withdrawing said liberated shale oil, off gases, and raw retort water from said series of underground retorts. 15. A process for retorting oil shale in accordance with claim 14 wherein 15% to 25% of said raw oil shale is removed from said subterranean formations. 16. A process for retorting oil shale in accordance with claim 14 including cooling said combustion zones with said purging fluid to a temperature greater than 650° F. and less than 800° F. before reignition. 17. A process for retorting oil shale in accordance with claim 14 wherein said purging fluid consists essentially of raw retort water containing oil shale particulates, shale oil, ammonia, and organic carbon, and some of said withdrawn retort water in step (g) is injected into said retorts for use as said purging fluid in steps (f) and (g). 18. A process for retorting oil shale in accordance with claim 14 wherein retort water is liberated from said surface retorting and injected into said underground retorts for use as part of said purging fluid. 19. A process for retorting oil shale in accordance with claim 14 wherein at least one adjacent pair of said retorts is operated in the combustion mode while at least one other adjacent pair of retorts is operated in the purge mode. 20. A process for retorting oil shale in accordance with claim 14 wherein every other retort is in phase in said combustion mode while the remaining retorts are in an opposite phase in said purge mode. 21. A process for retorting oil shale in accordance with claim 14 wherein the off gases liberated during the purge mode have a substantially greater concentration of hydrogen than said off gases liberated during the combustion mode. 22. A process in accordance with claim 21 wherein said purging mode off gases are separated from said combustion mode off gases. 23. A process in accordance with claim 22 wherein at least some of said purge mode off gases are recycled for use as part of said fuel gas. 24. A process in accordance with claim 22 wherein at least some of said purge mode off gases are recycled for use as part of said feed gas. 25. A process in accordance with claim 22 wherein at least some of said purge mode off gases are fed to a reactor, after at least some of the contaminants therein have been removed, for use in upgrading said shale oil. 26. A process in accordance with claim 22 wherein at least some of said combustion mode off gases are recycled for use as part of said fuel gas. 27. A process in accordance with claim 22 wherein at least some of said combustion mode off gases are recycled for use as part of said feed gas.
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이 특허에 인용된 특허 (10)
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