CN105176567A - Heavy oil processing coking prevention method and fractionating tower - Google Patents
Heavy oil processing coking prevention method and fractionating tower Download PDFInfo
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- CN105176567A CN105176567A CN201410281311.XA CN201410281311A CN105176567A CN 105176567 A CN105176567 A CN 105176567A CN 201410281311 A CN201410281311 A CN 201410281311A CN 105176567 A CN105176567 A CN 105176567A
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Abstract
A heavy oil processing coking prevention method belongs to the technical field of petroleum chemical engineering and process apparatuses, and is used to solve the coking problem of heavy processing fractionating towers. The method comprises the steps of fractionating tower washing desuperheating, high temperature oil gas entrance, low temperature cycle slurry oil entrance, low temperature oil gas discharge and high temperature cycle slurry oil discharge. The method is characterized in that a high temperature oil gas guiding device is arranged to guide high temperature oil gas entering the tower to a fractionating tower washing desuperheating segment, so the retention time of the high temperature oil gas in the fractioning tower is shortened, direct contact of high temperature cycle slurry oil with the high temperature oil gas is avoided, and local superheating of the high temperature cycle slurry oil is avoided; and the lower end of the washing desuperheating segment is provided with a high temperature cycle slurry oil collecting liquid guiding and cooling device in order to timely and rapidly reduce the temperature of the cycle slurry oil, so the retention time of the high temperature cycle slurry oil is shortened. The invention also provides an oil gas guiding tube, a liquid collecting and guiding skirt board and a rapid cooling medium distribution tube fractioning tower for realizing the method. The method maximally shortens the retention time of the high temperature oil gas and the high temperature cycle slurry oil and avoids local superheating of the cycle slurry oil in order to avoid system coking of the fractioning tower, and is applied in heavy oil catalytic cracking and coking fractionate towers.
Description
Technical field
The invention belongs to petrochemical complex, Process Equipment Technology field, particularly a kind of heavy oil upgrading anti-coking method and separation column.
Background technology
Heavy oil catalytically cracking equipment or coker separation column bottom are provided with washing desuperheating section, the catalyst fines adopting 250 ~ 280 DEG C of turning oil plasm scourings to remove high-temperature oil gas to carry, and make oil gas temperature drop to 360 ~ 365 DEG C from 500 DEG C to remove high-temperature oil gas superheating temperature; After 250 ~ 280 DEG C of circulation slurry oils complete washing desuperheating task, temperature is raised to 360 ~ 365 DEG C, then falls into fractionation column base.Circulation slurry oil polycyclic aromatic hydrocarbon content is up to 80%, and more than 360 DEG C, under high temperature and long residence time condition, polycyclic aromatic hydrocarbons generation condensation reaction generates macromole dirt shape thing, even causes system coking.Current industrial catalyticing cracking device is provided with cold oil slurry endless tube at Fractionator Bottom and stirs steam loop, entering part low temperature (250 ~ 280 DEG C) circulation slurry oil makes slurry oil cooling at the bottom of tower, and pass into steam-stirring, still often there are heavy oil catalytically cracking equipment or coker fractionating column system generation coking to affect production phenomenon.Analytical industry device separation column present situation needs to improve in following 3, and 1,500 DEG C of high-temperature oil gas is relatively long at dwell time in the tower; 2,360 ~ 365 DEG C of circulation slurry oils fall into fractionation column base process from washing desuperheating section and contact with 500 DEG C of high-temperature oil gas are reverse, and slurry oil flowing is uneven there will be circulation slurry oil local superheating; 3,360 ~ 365 DEG C of high temperature circulation slurry oil coolings are relatively long at dwell time in the tower not in time.
Summary of the invention
The object of this invention is to provide a kind of heavy oil upgrading anti-coking method, shorten high-temperature oil gas, the high temperature circulation slurry oil residence time to greatest extent, avoid high temperature circulation slurry oil directly to contact with 500 DEG C of high-temperature oil gas and cause circulation slurry oil local superheating.
The present invention solves the method that its technical problem adopts: comprise separation column washing desuperheating section, high-temperature oil gas enters, cold cycle slurry oil enters, low temperature oil gas is discharged, high temperature circulation slurry oil discharges, it is characterized in that: high-temperature oil gas guiding facility is set and will enters tower high-temperature oil gas and be guided to washing desuperheating section, shorten high-temperature oil gas at fractionation dwell time in the tower, and avoid high temperature circulation slurry oil directly to contact with high-temperature oil gas, avoid high temperature circulation slurry oil local superheating; High temperature circulation slurry oil liquid collecting water conservancy diversion and cooling installation are set in washing desuperheating section lower end, reduce circulation slurry oil temperature fast in time, shorten the high temperature circulation slurry oil residence time.
A kind of heavy oil upgrading anti-coking separation column, comprise separation column washing desuperheating section, oil and gas import, herringbone baffle plate or cone circle baffle plate, oil gas guide wire, collection drain skirtboard, fast cooling dielectric distribution pipe, collection drain skirtboard is provided with center air rising hole, leaves gap between outer and wall, arranges fast cooling dielectric distribution pipe above it; Oil gas guide wire lower end is connected with oil and gas import, and upper end is hydraucone or porous or multi-notch structure, reaches the top collecting drain skirtboard through center air rising hole, and outlet top arranges baffle plate.
Further, fast cooling dielectric distribution pipe is designed to 1 ~ 4 section, is connected respectively with 1 ~ 4 fast cooling medium entrance, distribution pipe down or tiltedly under some holes or nozzle are set.
Further, at herringbone baffle plate or cone circle baffle plate upper surface, some flow deflectors can also be set along flow direction.
Innovative point of the present invention and positively effect:
Innovative point of the present invention is: arrange high-temperature oil gas guiding facility and will enter tower high-temperature oil gas and be guided to washing desuperheating section, shorten high-temperature oil gas at fractionation dwell time in the tower, and avoid high temperature circulation slurry oil directly to contact with high-temperature oil gas, avoid high temperature circulation slurry oil local superheating; High temperature circulation slurry oil liquid collecting water conservancy diversion and cooling installation are set in washing desuperheating section lower end, reduce circulation slurry oil temperature fast in time, shorten the high temperature circulation slurry oil residence time.
Positively effect of the present invention is: 1, significantly shorten 500 DEG C of high-temperature oil gas at fractionation dwell time in the tower.2, in washing, desuperheating section lower end is quick in time that circulation slurry oil temperature is dropped to 340 DEG C from 360 DEG C, and 340 DEG C of circulation slurry oils are guided to separation column bottom wall, significantly shortens 360 DEG C of high temperature circulation slurry oil residence time and makes separation column bottom wall not overtemperature.3, eliminate conventional fractionation tower 360 DEG C of high temperature circulation slurry oils directly to contact with 500 DEG C of high-temperature oil gas, avoid 360 DEG C of high temperature circulation slurry oil local superheatings.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of a kind of heavy oil upgrading anti-coking method and separation column.
1-separation column washing desuperheating section, 2A-encloses baffle plate, and 3-bores baffle plate, 4-fast cooling dielectric distribution pipe, 5-center air rising hole, 6-collection drain skirtboard, 7-hydraucone, 8-oil gas guide wire, 9-oil and gas import.
Fig. 2 is the schematic diagram of another kind of heavy oil upgrading anti-coking method and separation column.
1-separation column washing desuperheating section, 2-herringbone baffle plate, 3-bores baffle plate, 4-fast cooling dielectric distribution pipe, 5-center air rising hole, 6-collection drain skirtboard, 7-hydraucone, 8-oil gas guide wire, 9-oil and gas import.
Embodiment
See Fig. 1, that separation column washing desuperheating section 1 adopts cone circle baffle plate scheme, collection drain skirtboard 6 is set below separation column washing desuperheating section 1, collection drain skirtboard 6 is provided with center air rising hole 5, leave gap between collection drain skirtboard 6 outer and separation column 1 wall, above collection drain skirtboard 6, fast cooling dielectric distribution pipe 4 is set.Below separation column washing desuperheating section 1, arrange oil gas guide wire 8, its lower end is connected with oil and gas import 9, and upper end is connected with hydraucone 7 end opening, hydraucone 7 top reaching collection drain skirtboard 6 through center air rising hole 5 suitable for reading.
See Fig. 2, that separation column washing desuperheating section 1 adopts herringbone baffle plate scheme, collection drain skirtboard 6 is set below separation column washing desuperheating section 1, collection drain skirtboard 6 is provided with center air rising hole 5, leave gap between collection drain skirtboard 6 outer and separation column 1 wall, above collection drain skirtboard 6, fast cooling dielectric distribution pipe 4 is set.Below separation column washing desuperheating section 1, arrange oil gas guide wire 8, its lower end is connected with oil and gas import 9, and upper end is connected with hydraucone 7 end opening, hydraucone 7 top reaching collection drain skirtboard 6 through center air rising hole 5 suitable for reading.
See Fig. 1, Fig. 2,500 DEG C of high-temperature oil gas enter from oil and gas import 9, enter below separation column washing desuperheating section 1 through oil gas guide wire 8, hydraucone 7, through cone baffle plate 3 lead annular space outside from it spatially rise enter separation column washing desuperheating section 1, carry out thermal exchange through cone baffle plate, circle baffle plate (Fig. 2 herringbone baffle plate) with the circulation slurry oil that flows downward and wash the catalyst fines that oil gas carries, oil gas temperature drops to 360 ~ 365 DEG C and leaves separation column washing desuperheating section 1 and enter separation column top and carry out fractionation.A part 250 ~ 280 DEG C of circulation slurry oils enter from separation column washing desuperheating section 1 top, through cone baffle plate, circle baffle plate (Fig. 2 herringbone baffle plate) carries out heat with the high-temperature oil gas upwards flowed, circulation slurry oil temperature is raised to 360 ~ 365 DEG C, basecoat cone baffle plate 3 through separation column washing desuperheating section 1 falls into collection drain skirtboard 6, another part 250 ~ 280 DEG C of circulation slurry oils enter collection drain skirtboard 6 from fast cooling dielectric distribution pipe 4 simultaneously, on collection drain skirtboard 6,360 ~ 365 DEG C of circulation slurry oils and 250 ~ 280 DEG C of circulation slurry oil mixing temperatures drop to 330 ~ 340 DEG C, 330 ~ 340 DEG C of circulation slurry oils lead to flow at the bottom of tower through separation column bottom wall by collecting drain skirtboard 6.
Claims (4)
1. a heavy oil upgrading anti-coking method, comprise separation column washing desuperheating section, high-temperature oil gas enters, cold cycle slurry oil enters, low temperature oil gas discharge, high temperature circulation slurry oil discharge, it is characterized in that: high-temperature oil gas guiding facility is set and will enters tower high-temperature oil gas and be guided to washing desuperheating section, shorten high-temperature oil gas at fractionation dwell time in the tower, and avoid high temperature circulation slurry oil directly to contact with high-temperature oil gas, avoid high temperature circulation slurry oil local superheating; High temperature circulation slurry oil liquid collecting water conservancy diversion and cooling installation are set in washing desuperheating section lower end, reduce circulation slurry oil temperature fast in time, shorten the high temperature circulation slurry oil residence time.
2. a heavy oil upgrading anti-coking separation column, comprise separation column washing desuperheating section, oil and gas import, herringbone baffle plate or cone circle baffle plate, oil gas guide wire, collection drain skirtboard, fast cooling dielectric distribution pipe, collection drain skirtboard is provided with center air rising hole, leaves gap between outer and wall, arranges fast cooling dielectric distribution pipe above it; Oil gas guide wire lower end is connected with oil and gas import, and upper end is hydraucone or porous or multi-notch structure, reaches the top collecting drain skirtboard through center air rising hole, and outlet top arranges baffle plate.
3. heavy oil upgrading anti-coking separation column according to claim 2, is characterized in that: fast cooling dielectric distribution pipe is designed to 1 ~ 4 section, is connected respectively with 1 ~ 4 fast cooling medium entrance, distribution pipe down or tiltedly under some holes or nozzle are set.
4. heavy oil upgrading anti-coking separation column according to claim 2, is characterized in that: can also arrange some flow deflectors at herringbone baffle plate or cone circle baffle plate upper surface along flow direction.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410281311.XA CN105176567A (en) | 2014-06-23 | 2014-06-23 | Heavy oil processing coking prevention method and fractionating tower |
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| CN201410281311.XA CN105176567A (en) | 2014-06-23 | 2014-06-23 | Heavy oil processing coking prevention method and fractionating tower |
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| CN105176567A true CN105176567A (en) | 2015-12-23 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113717754A (en) * | 2021-09-24 | 2021-11-30 | 上海纳科助剂有限公司 | Catalytic cracking process for producing high aromatic hydrocarbon oil and high yield liquefied gas |
| CN113717753A (en) * | 2021-09-24 | 2021-11-30 | 上海纳科助剂有限公司 | High aromatic hydrocarbon oil and preparation method and application thereof |
| CN113717752A (en) * | 2021-09-24 | 2021-11-30 | 上海纳科助剂有限公司 | High aromatic hydrocarbon oil and preparation method and application thereof |
| CN113755208A (en) * | 2021-09-24 | 2021-12-07 | 上海纳科助剂有限公司 | High aromatic hydrocarbon oil and preparation method and application thereof |
| CN113773874A (en) * | 2021-09-24 | 2021-12-10 | 上海纳科助剂有限公司 | High aromatic hydrocarbon oil and preparation method and application thereof |
| CN113897220A (en) * | 2021-09-24 | 2022-01-07 | 上海纳科助剂有限公司 | High aromatic hydrocarbon oil and preparation method and application thereof |
-
2014
- 2014-06-23 CN CN201410281311.XA patent/CN105176567A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113717754A (en) * | 2021-09-24 | 2021-11-30 | 上海纳科助剂有限公司 | Catalytic cracking process for producing high aromatic hydrocarbon oil and high yield liquefied gas |
| CN113717753A (en) * | 2021-09-24 | 2021-11-30 | 上海纳科助剂有限公司 | High aromatic hydrocarbon oil and preparation method and application thereof |
| CN113717752A (en) * | 2021-09-24 | 2021-11-30 | 上海纳科助剂有限公司 | High aromatic hydrocarbon oil and preparation method and application thereof |
| CN113755208A (en) * | 2021-09-24 | 2021-12-07 | 上海纳科助剂有限公司 | High aromatic hydrocarbon oil and preparation method and application thereof |
| CN113773874A (en) * | 2021-09-24 | 2021-12-10 | 上海纳科助剂有限公司 | High aromatic hydrocarbon oil and preparation method and application thereof |
| CN113897220A (en) * | 2021-09-24 | 2022-01-07 | 上海纳科助剂有限公司 | High aromatic hydrocarbon oil and preparation method and application thereof |
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Application publication date: 20151223 |
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| WD01 | Invention patent application deemed withdrawn after publication |