Heat recovery technique for catalyst regenerator flue gas
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C10G-035/14
C10G-035/00
C10G-035/10
출원번호
US-0812142
(2004-03-29)
등록번호
US-7404891
(2008-07-29)
발명자
/ 주소
van Egmond,Cor F.
Beech, Jr.,James H.
Klemm,Hans A.
Castaldy,Kyle
출원인 / 주소
ExxonMobil Chemical Patents Inc.
인용정보
피인용 횟수 :
12인용 특허 :
10
초록▼
A technique for recovering heat from a high temperature effluent stream from catalyst regeneration or the like, comprising processes and means for: (a) passing the effluent stream in heat exchange relationship in a steam generator with boiler feed water to produce high pressure steam and partially c
A technique for recovering heat from a high temperature effluent stream from catalyst regeneration or the like, comprising processes and means for: (a) passing the effluent stream in heat exchange relationship in a steam generator with boiler feed water to produce high pressure steam and partially cool the effluent stream; (b) passing the partially cooled effluent stream from the steam regenerator in heat exchange relationship to preheat high pressure boiler feed water and further cool the effluent stream; and (c) passing the preheated boiler feed water to the steam generator. The apparatus and processes for thermal energy recovery may be used to treat hot regenerator effluent from FCC or OTO-type processes, thereby producing a cooled flue gas stream to discharge to ambient atmosphere.
대표청구항▼
We claim: 1. A process for recovering heat from a high temperature effluent stream from a catalyst regenerator, wherein the process comprises the steps of: (a) passing the effluent stream from a catalyst regenerator through a heat exchanger associated with a steam generator fed with liquid preheate
We claim: 1. A process for recovering heat from a high temperature effluent stream from a catalyst regenerator, wherein the process comprises the steps of: (a) passing the effluent stream from a catalyst regenerator through a heat exchanger associated with a steam generator fed with liquid preheated boiler feed water to produce high pressure steam and partially cool the effluent stream; (b) passing the partially cooled effluent stream through a heat exchanger associated with a high pressure boiler feed water preheater to provide preheated boiler feed water and further cool the effluent stream; and (c) passing the preheated boiler feed water to the steam generator, wherein the preheated boiler feed water and the high pressure steam from the steam generator are mixed in a steam drum and liquid preheated boiler feed water is passed from the steam drum to the steam generator, wherein the high temperature effluent stream has a temperature of at least about 650�� C., the partially cooled effluent stream has a temperature not greater than about 262�� C., and the further cooled effluent stream has a temperature not greater than about 127�� C., and wherein high pressure steam is taken from the steam drum. 2. The process of claim 1, wherein the high temperature effluent stream has a temperature ranging from about 650�� to about 730�� C., the partially cooled effluent stream has a temperature ranging from about 232�� to about 343�� C., and the further cooled effluent stream has a temperature ranging from about 116�� to about 204�� C. 3. The process of claim 1, wherein the high temperature effluent stream has a temperature ranging from about 652�� to about 691�� C., the partially cooled effluent stream has a temperature ranging from about 260�� to about 316�� C., and the further cooled effluent stream has a temperature ranging from about 127�� to about 160�� C. 4. The process of claim 1, wherein the preheated boiler feed water has a pressure of at least about 4240 kPaa, and a temperature of at least about 150�� C. 5. The process of claim 1, wherein the preheated boiler feed water has a pressure ranging from about 4240�� to about 7688 kPaa, and a temperature ranging from about 150�� to about 293�� C. 6. The process of claim 1, wherein the preheated boiler feed water has a pressure ranging from about 4240�� to about 6309 kPaa, and a temperature ranging from about 150�� to about 277�� C. 7. The process of claim 1, wherein the further cooled effluent stream contains catalyst fines and is directed to a catalyst fines removal unit for removal of the catalyst fines. 8. The process of claim 7, wherein the catalyst fines removal unit is selected from the group consisting of: an electrostatic precipitator, a wet electrostatic precipitator, a cyclone separator or other inertial separation device, a filter, a baghouse and a wet gas scrubber. 9. The process of claim 8, wherein the effluent stream is passed from the catalyst fines removal unit to a flue gas stack for disposal in ambient atmosphere. 10. The process of claim 1, wherein the high temperature effluent stream contains catalyst fines and is directed to a catalyst fines removal unit before step (a) for removal of the catalyst fines. 11. The process of claim 10, wherein the catalyst fines removal unit is selected from the group consisting of: a cyclone separator or other inertial separation device, a metal filter and a ceramic filter. 12. The process of claim 1, wherein the partially cooled effluent stream contains catalyst fines and is directed to a catalyst fines removal unit for removal of the catalyst fines. 13. The process of claim 12, wherein the catalyst fines removal unit is selected from the group consisting of: an electrostatic precipitator, a cyclone separator or other inertial separation device, and a filter. 14. The process of claim 1, wherein the high temperature effluent stream is taken from a catalyst regenerator of a fluidized catalytic cracker. 15. The process of claim 1, wherein the high temperature effluent stream is taken from a catalyst regenerator associated with an oxygenate to olefins reactor. 16. The process of claim 1, wherein the high temperature effluent stream is taken from a catalyst regenerator associated with a methanol to olefins reactor. 17. The process of claim 1, wherein the steam generator and the preheater are located within a common enclosure. 18. A process for catalytic conversion using a molecular sieve catalyst which accumulates carbonaceous deposit during operation of a catalytic reactor, wherein the carbonaceous deposit is removed in a high temperature regenerator unit with a regeneration medium, the process comprising the steps of: (a) passing a high temperature effluent stream from the regenerator unit to a heat exchanger associated with a steam generator fed with preheated boiler feed water, to produce high pressure steam and a partially cooled effluent stream; (b) passing the partially cooled effluent stream to a heat exchanger associated with a high pressure boiler feed water preheater to provide preheated boiler feed water and further cooled effluent stream; (c) passing the preheated boiler feed water and the high pressure steam from the steam generator to a steam drum for direct contact and mixing; (d) recovering high pressure steam from the steam drum; and (e) passing liquid preheated boiler feed water from the steam drum to the steam generator, thereby providing efficient recovery of thermal values, wherein the high temperature effluent stream has a temperature of at least about 650�� C., the partially cooled effluent stream has a temperature not greater than about 262�� C., and the further cooled effluent stream has a temperature not greater than about 127�� C. 19. The process of claim 18, wherein the further cooled effluent stream contains catalyst fines and is passed to a catalyst fines removal unit for removal of the catalyst fines. 20. The process of claim 19, wherein the catalyst fines removal unit is selected from the group consisting of: an electrostatic precipitator, a wet electrostatic precipitator, a cyclone separator or other inertial separation device, a filter, a baghouse and a wet gas scrubber. 21. The process of claim 19, wherein the catalyst fines comprise particles whose largest particle dimension is less than about 100 microns. 22. The process of claim 19, wherein the catalyst fines comprise particles whose largest particle dimension is less than about 60 microns. 23. The process of claim 19, wherein the effluent stream is passed from the catalyst fines removal unit to a flue gas stack for disposal in ambient atmosphere. 24. The process of claim 18, wherein the high temperature effluent stream has a temperature ranging from about 650�� to about 730�� C., the partially cooled effluent stream has a temperature ranging from about 232�� to about 343�� C., and the further cooled effluent stream has a temperature ranging from about 116�� to about 24�� C. 25. The process of claim 18, wherein the high temperature effluent stream has a temperature ranging from about 652�� to about 691�� C., the partially cooled effluent stream has a temperature ranging from about 260 to about 316�� C., and the further cooled effluent stream has a temperature ranging from about 127�� to about 160�� C. 26. The process of claim 18, wherein the preheated boiler feed water has a pressure of at least about 4240 kPaa, and a temperature of at least about 150�� C. 27. The process of claim 18, wherein the preheated boiler feed water has a pressure ranging from about 4240 to about 7688 kPaa, and a temperature ranging from about 150�� C. to about 293�� C. 28. The process of claim 18 wherein the preheated boiler feed water has a pressure ranging from about 4240 to about 6309 kPaa, and a temperature ranging from about 150�� to about 277�� C. 29. The process of claim 18, wherein the high temperature effluent stream is taken from a catalyst regenerator of a fluidized catalytic cracker. 30. The process of claim 18, wherein the high temperature effluent stream is taken from a catalyst regenerator associated with an oxygenate to olefins reactor. 31. The process of claim 18, wherein the high temperature effluent stream is taken from a catalyst regenerator associated with a methanol to olefins reactor. 32. The process of claim 31, wherein the catalyst comprises SAPO-34. 33. The process of claim 18, wherein the steam generator and the preheater are located within a common enclosure. 34. The process of claim 18, wherein the partially cooled effluent stream has been cooled to no less than about 249�� C., and the further cooled effluent stream has been cooled to at least 25�� C. less than the partially cooled effluent stream temperature. 35. The process of claim 18, wherein the partially cooled effluent stream has been cooled to no less than about 277�� C., and the further cooled effluent stream has been cooled to at least 25�� C. less than the partially cooled effluent stream temperature.
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