IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0129248
(2005-05-13)
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등록번호 |
US-7727382
(2010-06-22)
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발명자
/ 주소 |
- Sparks, Steven W.
- Chen, Te-Hung
- Eppig, Christopher P.
- Siskin, Michael
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출원인 / 주소 |
- ExxonMobil Research and Engineering Company
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
10 인용 특허 :
41 |
초록
▼
A method for producing and removing coke which has bulk morphology such that at least about 30 volume percent is free-flowing under the force of gravity or hydrostatic forces from a delayed coker drum. At the completion of the fill cycle, the coker drum, filled with hot coke, is cooled by steaming a
A method for producing and removing coke which has bulk morphology such that at least about 30 volume percent is free-flowing under the force of gravity or hydrostatic forces from a delayed coker drum. At the completion of the fill cycle, the coker drum, filled with hot coke, is cooled by steaming and then flooding it with water, thereby producing a coke/water mixture. The coke/water mixture is released from the coke drum through one or more drum closure/discharge throttling systems near the bottom of the coker drum.
대표청구항
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The invention claimed is: 1. A process for producing and removing coke which has a bulk morphology such that at least 60 volume percent is substantially free-flowing from a delayed coker vessel, which delayed coker vessel contains: i) a bottom portion defining an aperture through which coke is disc
The invention claimed is: 1. A process for producing and removing coke which has a bulk morphology such that at least 60 volume percent is substantially free-flowing from a delayed coker vessel, which delayed coker vessel contains: i) a bottom portion defining an aperture through which coke is discharged; ii) at least one inlet feed entry line positioned above said aperture; and iii) a drum closure/discharge throttling system having a closure member and being sealing attached to the bottom of the coker vessel and covering said aperture; comprising: a) ensuring that the closure member of said drum closure/discharge throttling system is in the closed position; b) feeding a heated residuum feedstock to a coker vessel through one or more feed lines, which feedstock is one that is capable of producing coke that has a bulk morphology such that at least 60 volume percent is substantially free-flowing under the force of gravity or hydrostatic forces in the coke drum, or one that will form free-flowing coke with use of a suitable additive, under delayed coking conditions; c) maintaining the coker vessel at delayed coker conditions for an effective amount of time thereby resulting in vapor products and a bed of at least 60 volume percent of substantially free-flowing shot coke; d) removing at least a portion of the vapor products overhead; e) quenching said bed comprised of at least 60 volume percent of substantially free-flowing shot coke with steam injected into the coker drum and removing additional vapor products overhead; f) introducing water into said coker vessel to cool the bed comprised of at least 60 volume percent substantially free-flowing shot coke and retaining the water in the vessel to form a slurry with the substantially free-flowing shot coke; g) throttling open said closure member in a controlled fashion to allow a controlled discharge of the substantially free-flowing shot coke and water as a slurry from the coker vessel; and h) collecting the coke discharged from the coker vessel. 2. The process of claim 1 wherein the feedstock is fed into the vessel in at least two locations at the lower section of the coker vessel, but above the aperture where coke is discharged. 3. The process of claim 1 wherein the closure member is a valve selected from the group consisting of a single-slide slide valve, a dual-slide slide valve, ball valve, a knife valve, a wedge-within-wedge valve, a ram valve, and a wedge plug valve. 4. The process of claim 1 wherein the drum closure/discharge throttling system is a double block and purge valve assembly. 5. The process of claim 3 wherein the valve has at least one steam purge means. 6. The process of claim 1 wherein the drum closure/discharge throttling system is actuated by a hydraulically-powered system. 7. The process of claim 1 wherein the drum closure/discharge throttling system is actuated by an electrically-powered system. 8. The process of claim 1 wherein the drum closure/discharge throttling system is actuated by a manually powered system. 9. The process of claim 1 wherein the control of the drum closure/discharge throttling system is automated. 10. The process of claim 9 wherein the drum closure/discharge throttling valve is controlled by one or more input signals from the coker drum that activate a signal in response to predetermined set points for one or more of process temperature, pressure, level of coke in the drum, and coke discharge rate. 11. The process of claim 1 wherein the opening and closing forces of the drum closure/discharge throttling system are measured in relation to the percent closure of closure member. 12. The process of claim 1 wherein the coker feedstock is blended so that the total dispersed metals content of the blend will be greater than about 250 wppm and the API gravity will be less than about 5.24. 13. The process of claim 1 wherein the coker feed is a vacuum resid that contains less than about 10 wt. % material boiling between 900° F. (482.22° C.) and 1040° F. (560° C.) as determined by HTSD (High-temperature Simulated Distillation). 14. The process of claim 1 wherein an additive is used to aid in the formation of coke comprised of at least 60 volume percent of substantially free-flowing coke. 15. The process of claim 14 wherein the additive is selected from the group consisting of metals-containing additives, non-metals containing additives, overbased alkali and alkaline-earth surfactant additives, polymeric additives and low molecular weight aromatic additives. 16. The process of claim 14 wherein the additives is an organic soluble, organic insoluble, or non-organic miscible metals-containing additive that is effective for the formation of substantially free-flowing coke. 17. The process of claim 16 wherein the metal of the additive is selected from the group consisting of sodium, potassium, iron, nickel, vanadium, tin, molybdenum, manganese, aluminum, cobalt, calcium, magnesium, and mixtures thereof. 18. The process of claim 14 wherein the additive is an overbased alkali or alkaline-earth surfactant selected from the group consisting of: (i) sulfonic acids, (ii) carboxylic acids, (iii) salicylic acids, (iv) alkylphenols, (v) sulfurized alkylphenols, and (vi) organic phosphorus acids characterized by at least one direct carbon-to-phosphorus linkage. 19. The process of claim 1 in which the coke is a solid in the form of substantially free-flowing particles. 20. The process of claim 1 in which the coke is a solid in the form of substantially free-flowing particles and which is free-flowing under the force of gravity or hydrostatic forces. 21. The process of claim 1 in which the coker vessel is maintained at delayed coker conditions including a temperature of 900 to 1000° F. for an effective amount of time to result in vapor products and a bed of at least 60 volume percent of substantially free-flowing coke. 22. The process of claim 1 in which the bed of coke in the coker vessel comprises at least 90 volume percent of substantially free-flowing coke.
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