CN1089624C - Mixed combustion technique by catalytic cracking of fume to regenerate it - Google Patents
Mixed combustion technique by catalytic cracking of fume to regenerate it Download PDFInfo
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- CN1089624C CN1089624C CN98102067A CN98102067A CN1089624C CN 1089624 C CN1089624 C CN 1089624C CN 98102067 A CN98102067 A CN 98102067A CN 98102067 A CN98102067 A CN 98102067A CN 1089624 C CN1089624 C CN 1089624C
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- flue gas
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Abstract
The present invention relates to energy recovering technology for two sections of regeneration smoke gas exhausted by a catalytic cracking device, which is characterized in that: in two sections of regeneration smoke gas, the first section of regeneration smoke gas with CO and the second section of regeneration smoke gas with O2 are directly mixed for combustion in a pipeline after the smoke gas comes out of a regenerator. The smoke gas after combustion orderly enters two high temperature heat extractors to generate medium pressure steam. Two butterfly valves or adjusting valves are provided, so the temperature of the smoke gas entering a tertiary cyclone separator through an outlet of the heat extractor can be neatly regulated to make the smoke gas achieve an optimum state. The present invention has the characteristics of energy saving, reduced technologic equipment, investment saving, flexible operation and guarantee of safety production.
Description
The two-stage regeneration that the present invention relates to petroleum refining catalytic cracking unit technology, particularly catalytic cracking unit is discharged the energy recovery technology of flue gas.
Catalytic cracking unit is one of main production plant of oil plant, because crude oil in China lays particular stress on mostly, therefore RFCC causes the special attention on China oil refining circle, except that the research of catalyst and reaction system aspect, also carried out a large amount of work at the catalyst regeneration technical elements, developed multiple technologies, as bubbling bed, turbulent bed and fast bed, its combustion technology has completing combustion (not containing CO in the flue gas) and imperfect combustion (containing CO in the flue gas).Structural shape has single hop and two-stage regeneration.
RFCC be with heavy raw oil under the effect of catalyst, decomposition reaction generates lighter hydrocarbons (gas, gasoline and diesel oil etc.) and is condensed into coke, coke laydown makes activity of such catalysts descend on the surface of catalyst, through using the carbon deposit on the air burning-off catalyst after the reaction, recover activity of such catalysts, and a large amount of high-temperature flue gas that produce in this regenerative combustion process are being stored very big energy.Energy how to make good use of this part regenerated flue gas also is the problem of research always.
In the prior art, for the single hop regenerator, the scheme that is used for reclaiming completing combustion (regenerated flue gas does not contain CO) regenerated flue gas energy is the advanced third level cyclone separator of a regenerated flue gas separating catalyst, advance flue gas turbine expander again and reclaim heat energy and pressure energy, drive the main air blower or the direct generation of electricity, enter waste heat boiler generation Steam Recovery heat energy at last, temperature is reduced to about 200 ℃ enters chimney.
For the two-stage regeneration device, to finish in two regenerators because of the coke burning, first regenerator is an imperfect combustion, contains CO in the flue gas, second regenerator is completing combustion, contains superfluous O in the flue gas
2, three kinds of energy recovery process are arranged at present:
First kind of flow process is that the flue gas that contains CO (about 680 ℃ of temperature) that first regenerator is discharged enters third level cyclone separator recovery catalyst, enter flue gas turbine expander recovery heat energy and pressure again and can drive main air blower, temperature drops to about 510 ℃, and second regenerator is discharged contains O
2Flue gas (700～730 ℃ of temperature) with recover energy after first regenerator flue gas mix after enter CO boiler generation Steam Recovery heat, enter chimney at last.The shortcoming of this flow process is that the flue gas pressures of second regenerator can be fully used;
Second kind of flow process is that the high-temperature flue gas of second regenerator is first through heating steam, flue-gas temperature is reduced, flue gas with first regenerator mixes again, its mixing temperature is controlled at below 580 ℃, be as the criterion so that second-time burning not to take place, enter third level cyclone separator then and reclaim catalyst, enter the cigarette machine again and reclaim heat energy and pressure energy, enter the CO boiler again and reclaim heat, enter chimney at last.After the shortcoming of this flow process was first and second regenerator flue gas mix, the CO burning did not with great difficulty take place in control, and destruction equipment influences long-term operation.Be provided with huge CO boiler simultaneously.
The third flow process is the disclosed flow process of Chinese patent CN1123194A, first and second section regenerated flue gas is blended in by the flue gas blender and carries out CO in the flue and give burning in the two-stage regeneration, entering ad hoc CO burner then burns, the flue gas that burning is discharged enters flue gas heat collector heat-obtaining, reduce flue-gas temperature, enter flue gas turbine expander expansion acting again, discharge after the flue gas that flue gas turbine expander is discharged enters the waste heat boiler recovery waste heat.The shortcoming of this flow process is to need ad hoc CO burner, has increased equipment investment and floor space, adopts the heat collector of a more complicated heaviness, is not easy to the flue-gas temperature of flexible modulation heat collector outlet.
The objective of the invention is to overcome existing various two-stage regeneration gas energies and reclaim the above-mentioned of technological process; shortcoming; by adopting the technology of direct mixed combustion in pipeline; accomplish to make full use of to greatest extent the energy of two-stage regeneration flue gas, can protect equipment survivable again, keep the longer cycle running; accomplish simultaneously to simplify technological process and equipment; reduce investment outlay, again can flexible operating, guarantee safety in production.
Catalytic cracking two-stage regeneration gas energy of the present invention reclaims technology and is achieved in that its two-stage regeneration flue gas passes through steps of processing successively:
(1) utilization is with first section regenerated flue gas of CO and is with O
2Second section regenerated flue gas from the regenerator just direct mixing catalytic combustion pipeline of back that comes out, do not establish special blender and CO burner;
(2) gas fume after burning enters two high temperature heat collector generation middle pressure steams successively, with the reduction flue-gas temperature, and reclaims heat energy.
(3) between second high temperature heat collector smoke entrance, be provided with the connection line, two butterfly valves or control valve are equipped with in outlet with second heat collector on the connection line, can regulate heat collector neatly and export the into flue-gas temperature of third level cyclone separator, make it to reach optimum state.
(4) flue gas behind third level cyclone separator separating catalyst enters flue gas turbine expander expansion acting, enters waste heat boiler then, discharges from chimney behind the recovery waste heat.
Because the present invention has adopted the two-stage regeneration flue gas directly to mix catalytic combustion in pipeline; and burning back flue gas enters two high temperature heat collector generation middle pressure steams and the comprehensive technological scheme that two butterfly valves or control valve flexible modulation flue-gas temperature are set successively; thereby can accomplish to make full use of to greatest extent the energy of two-stage regeneration flue gas; can protect equipment survivable again; thereby keep the longer cycle running; and has the technological process of simplification and equipment, flexible operation, the characteristics of reducing investment outlay.Be described in further detail embodiments of the invention below in conjunction with accompanying drawing.
Fig. 1 is that catalytic cracking two-stage regeneration gas energy reclaims process chart.
The interior flow process of frame of broken lines is the present invention and existing technological process difference among Fig. 1.Now specific embodiment of the present invention is described in detail in detail in conjunction with Fig. 1:
After the first section regenerated flue gas that contains CO comes out from first regenerator 1, with the O that contains that from second section regenerator 2, comes out
2Second section regenerated flue gas, in pipeline mixed combustion section 3, directly mix catalytic combustion, mixing time of contact is more than 0.2 second, does not establish special blender and CO burner.Burning back flue-gas temperature is elevated to 1000～1200 ℃, and flue gas enters high temperature heat collector generation middle pressure steam very soon, drops to 650～740 ℃.Being provided with two heat collectors 4 and 5,6 in this flow process is drum, and high-temperature flue gas is introduced into first heat collector 4, enters second heat collector 5 then.Be provided with between second heat collector smoke entrance and be communicated with line 7, butterfly valve (or control valve) 8 and 9 is equipped with in outlet respectively with second heat collector on the connection line, 700 ℃ of can utilize the aperture of control valve 8 and 9 to control to enter third level cyclone separator flue-gas temperature and setting are close, and wherein 10 is thermocouple.Flue gas after the heat-obtaining cooling is introduced into third level cyclone separator 11 and reclaims catalyst, enter flue gas turbine expander 12 expansion actings then, drive main air blower 13 or, enter waste heat boiler 15 then, discharge from chimney 16 behind the recovery waste heat directly by dynamoelectric machine 14 direct generations of electricity.
Claims (3)
1, a kind of catalytic cracking two-stage regeneration gas energy reclaims technology, it is characterized in that the two-stage regeneration flue gas is successively through the following steps processing:
(1) utilization contains first section regenerated flue gas of CO and contains O
2Second section regenerated flue gas from the regenerator just direct mixing catalytic combustion pipeline of back that comes out, do not establish special blender and CO burner;
(2) gas fume after burning enters two high temperature heat collector generation middle pressure steams successively, with the reduction temperature, and reclaims heat energy;
(3) between second high temperature heat collector smoke entrance, be provided with the connection line, two butterfly valves or control valve are equipped with in outlet with second heat collector on the connection line, can regulate heat collector neatly and export the into flue-gas temperature of third level cyclone separator, make it to reach optimum state.
(4) flue gas behind third level cyclone separator separating catalyst enters flue gas turbine expander expansion acting, enters waste heat boiler then, discharges from chimney behind the recovery waste heat.
2, two-stage regeneration gas energy according to claim 1 reclaims technology, it is characterized in that first section regenerated flue gas and second section regenerated flue gas directly mix in pipeline, and, make CO in first regenerator flue gas and the O in second regenerator flue gas through the mixing time of contact more than 0.2 second
2Catalytic combustion, temperature are raised to 1000～1200 ℃.
3, reclaim technologies according to claim 1 and 2 described two-stage regeneration gas energies, it is characterized in that high-temperature flue gas enters two high temperature heat collector generation middle pressure steams after, cool to 650～750 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN98102067A CN1089624C (en) | 1998-06-09 | 1998-06-09 | Mixed combustion technique by catalytic cracking of fume to regenerate it |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN98102067A CN1089624C (en) | 1998-06-09 | 1998-06-09 | Mixed combustion technique by catalytic cracking of fume to regenerate it |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1238234A CN1238234A (en) | 1999-12-15 |
| CN1089624C true CN1089624C (en) | 2002-08-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN98102067A Expired - Lifetime CN1089624C (en) | 1998-06-09 | 1998-06-09 | Mixed combustion technique by catalytic cracking of fume to regenerate it |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105140245A (en) * | 2009-12-18 | 2015-12-09 | 株式会社半导体能源研究所 | Liquid crystal display device and electronic device |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1323757C (en) * | 2003-09-26 | 2007-07-04 | 中国石油化工集团公司 | Regeneration technique for fumes and gas flue in imperfect combustion |
| CN112121632A (en) * | 2020-09-24 | 2020-12-25 | 淄博海益精细化工有限公司 | Process and device for recycling liquefied gas sweetening tail gas |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1123194A (en) * | 1995-08-11 | 1996-05-29 | 中国石化洛阳石油化工工程公司 | Method for burning regenerated gas CO and recovering energy thereof |
| US5603908A (en) * | 1992-09-16 | 1997-02-18 | The Kansai Electric Power Co., Inc. | Process for removing carbon dioxide from combustion gases |
-
1998
- 1998-06-09 CN CN98102067A patent/CN1089624C/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5603908A (en) * | 1992-09-16 | 1997-02-18 | The Kansai Electric Power Co., Inc. | Process for removing carbon dioxide from combustion gases |
| CN1123194A (en) * | 1995-08-11 | 1996-05-29 | 中国石化洛阳石油化工工程公司 | Method for burning regenerated gas CO and recovering energy thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105140245A (en) * | 2009-12-18 | 2015-12-09 | 株式会社半导体能源研究所 | Liquid crystal display device and electronic device |
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| Publication number | Publication date |
|---|---|
| CN1238234A (en) | 1999-12-15 |
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