CN1843549A - Decompression tower bottom coke inhibiting device and its uses - Google Patents
Decompression tower bottom coke inhibiting device and its uses Download PDFInfo
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- CN1843549A CN1843549A CN 200610013369 CN200610013369A CN1843549A CN 1843549 A CN1843549 A CN 1843549A CN 200610013369 CN200610013369 CN 200610013369 CN 200610013369 A CN200610013369 A CN 200610013369A CN 1843549 A CN1843549 A CN 1843549A
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- inhibiting device
- tower
- tower bottom
- quench oil
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Abstract
The invention provides a bottom burnt-against device of pressure-relief tower, which comprises a porous baffle plate, a liquid baffle cap and a support bar plate. Wherein, the baffle plate is a cylinder whose diameter is not less than the inner diameter of extract kettle; the porous rate of said cylinder is higher than 90%; the diameter of external edge of liquid baffle cap is lager than the porous baffle plate; and the support bar plate is arranged between the liquid baffle cap and the porous baffle plate. The invention has better effect when used in quench oil distributing tubes; the burnt-against device is mounted under the stripping section and above the extract kettle, while the quench oil distributing tubes are arranged on the burnt-against device. The invention can improve the flow-ability of liquid, strengthen the turbulence, avoid the generation and accumulation of coke, and confirm the normal operation and separation effect of tower.
Description
Technical field
The present invention relates to a kind of destilling tower internals, particularly the decompression tower bottom coke inhibiting device of atmospheric and vacuum distillation unit and application.
Technical background
Destilling tower be a kind ofly be widely used in refining oil, the key equipment of petrochemical plant, be used for products of separated.The efficient direct relation of destilling tower the quality of product quality.
At many occasions such as oil refining apparatus vacuum tower, coking fractional distillation column, catalytic fractionator, ethylene unit oil scrubber etc., because feeding temperature is very high, usually above 400 ℃, feed zone and charging are also very high with the hypomere operating temperature in the tower, material is easy to take place thermal cracking, polymerisation in the tower in the high-temperature region, produce micro-molecular gas, coking takes place simultaneously, extract mouth out at the bottom of stopping up tower internals and tower, make the tower internal drop sharply raise, destroyed the normal running in the tower, have a strong impact on product quality, even can't operate, brought serious harm to production.In order to prevent or to alleviate coking phenomenon in the tower, need reduce temperature in the tower as far as possible, it at present mainly is the mode that adopts the quench oil circulation, at the bottom of tower, extract one liquid with pump out, after cooling, return charging aperture below in the tower again, be no more than 360 ~ 370 ℃ for the general control tower still of crude(oil)unit vacuum tower temperature.
Adopt the quench oil circulating technology to be reduced to residue oil temperature below 370 ℃, can relax coking problem to a certain extent, but can not avoid fully, especially for current decompression deep drawing technology, feeding temperature reaches more than 400 ℃, residue oil temperature is up to more than 390 ℃ at the bottom of the tower, after high-temperature material advances tower, must directly contact with material in a part of tower, simultaneously, have many liquid flows dead angle in the tower, it is too high that liquid mixes the inhomogeneous local temperature that also may cause in the tower still, still coking can take place in these zones, coke is in case generate, will slowly accumulate, to bottoms material drawing pump, the operation of cold exchange device impacts, and serious meeting influences device production and causes shut-down.
Summary of the invention
The objective of the invention is to, the decompression tower bottom coke inhibiting device and the application that provide a kind of destilling tower still to use, the resistance coke installation is installed in tower still undergauge place, play and avoid material because the too high and effect of coking of temperature, simultaneously when a small amount of coking takes place, can play the filtration coke button, stop it to enter the effect of tower still.
Technology of the present invention is as follows:
Decompression tower bottom coke inhibiting device comprises perforated baffle, liquid-blocking cap and bearing rib; Wherein baffle plate is a cylindrical shape, and drum diameter generally equals greater than extracting the still internal diameter out, and the percent opening in the hole on the cylinder is greater than 90%; The liquid-blocking cap external profile diameter is provided with bearing rib greater than perforated baffle between liquid-blocking cap and the perforated baffle.
The height of described perforated baffle is 500～1000mm.
Described liquid-blocking cap is taper or disc, and external profile diameter is greater than perforated baffle drum diameter 50～100mm.
Hole on the described perforated baffle is circular hole or slotted hole or rectangle.
It is better that the resistance coke installation is applied in the still of band quench oil distributor pipe effect at the bottom of the tower of the present invention, and decompression tower bottom coke inhibiting device is installed in the below of stripping section, the top of extracting still out, is provided with the quench oil distributor pipe on the resistance coke installation.
Described quench oil distributor pipe 6 is connected with quench oil inlet tube 4 by flange 5, and arm is a pipe, and the every oblique below of arm is provided with fluid hole 7.Fluid hole 7 directions are near tower wall side, fluid hole perforate direction and the vertical direction angle to 90 ° at 45, and total open area is 0.5～4 times that quench oil is gone into tower house steward area.
Described quench oil distributor pipe is made as " H " shape arm corresponding to top double overflow tower tray or the single overflow tower tray is made as "T"-shaped arm.
Described stripping section is the herringbone baffle arrangement, and the quench oil distributor pipe then is a multi-limbed tube, and every arm symmetry is opened the fluid hole of two rows under oblique, and the perforate direction also is 45 °～90 °.
Decompression tower bottom coke inhibiting device is installed in the below of stripping section, the top of extracting still out, can make charging fall liquid and quench oil fully, rapid mixing, and strengthen the turbulence of liquid, thus reduction tower still temperature.
In addition, when baffle plate drum diameter when extracting the still internal diameter out, the cylinder bottom gets final product with the welding of dome head intersection.
Effect of the present invention can from following description embody more abundant: liquid the gas-liquid mixed charging or high-temperature oil gas are advanced the liquid that cools down behind the tower, enter stripping section with the liquid that flows down from tower top, high-temp liquid contacts with stripped vapor through stripping section tower tray or herringbone baffle plate, flow down from fluid-tight dish or herringbone baffle plate behind the stripping, fully mix with liquid from the ejection of quench oil distributor pipe fluid hole, fluid temperature reduces rapidly, flow to the annular space that resistance coke installation and tower wall form then, the perforated baffle through the resistance coke installation flows into the tower still again.Perforated baffle has strengthened the turbulence effect of liquid greatly, has strengthened flow velocity, has avoided the generation of coke.Enter extract still at the bottom of the tower out fluid temperature generally at 360～370 ℃, this temperature can and be returned temperature and control by the quench oil internal circulating load, the oil product under this temperature is difficult for taking place coking.Extracting the still height out required to decide according to the time of staying.
This resistance coke installation makes the high-temp liquid that descends in the tower fully mix with quench oil, temperature enters the tower still after reducing again, avoided high-temperature material directly to enter the tower still, and guaranteed the uniformity of fluid temperature in the tower still, avoid the formation of localized hyperthermia, hindered the flow regime that being provided with of coke installation improved liquid simultaneously, strengthened the turbulence effect, avoid the generation and the accumulation of coke, thereby guaranteed the normal running and the separative efficiency of tower.
Description of drawings
Fig. 1 a: resistance coke installation structural front view;
Fig. 1 b: resistance coke installation structure vertical view;
Fig. 2: quench oil distributor pipe schematic diagram;
Fig. 3: quench oil distributor pipe perforate A-A schematic diagram;
Fig. 4: resistance coke installation and quench oil distributor pipe installation site schematic diagram.
Wherein: 1-perforated baffle, 2-bearing rib, 3-liquid-blocking cap, 4-quench oil inlet tube, 5-flange, 6-quench oil distributor pipe, 7-fluid hole, 8-stripped vapor distributor pipe, 9-fluid-tight dish, 10-stripping section tower tray.
The specific embodiment
The present invention is further described below in conjunction with accompanying drawing and embodiment.
Shown in Fig. 1 a and Fig. 1 b, the sidewall of resistance coke installation is a cylindrical shape perforated baffle 1, drum diameter equals or is slightly larger than to extract the still internal diameter out, have a plurality of circular holes or slotted hole on the sidewall, the top of perforated baffle adds the liquid-blocking cap 3 of a taper, both connect by bearing rib 2, and the liquid that liquid-blocking cap 3 will fall from above is led in the annular space of resistance coke installation and the formation of tower wall.
As shown in Figure 2, quench oil distributor pipe 6 is connected with quench oil inlet tube 4 by flange 5, be made as " H " shape arm or the single overflow tower tray is made as "T"-shaped arm corresponding to top double overflow tower tray, arm is a pipe, a row or two row's fluid holes 7 are opened in every oblique below of arm, and fluid hole 7 directions be close tower wall side, fluid hole perforate direction and the vertical direction angle to 90 ° at 45, as shown in Figure 3, total open area is 0.5～4 times that quench oil is gone into tower house steward area.If stripping section is the herringbone baffle arrangement, the quench oil distributor pipe then is a multi-limbed tube, and every arm symmetry is opened the fluid hole of two rows under oblique, and the perforate direction also is 45 °～90 °.
Adopting the double overflow tray structure with stripping section is example, and each several part tower internals relative mounting positions as shown in Figure 4.Below the stripping section tower tray 10 is stripped vapor distributor pipe 8, and the following of stripped vapor distributor pipe 8 is quench oil distributor pipe 6, is the resistance coke installation of being made up of perforated baffle 1, bearing rib 2 and liquid-blocking cap 3 at stripping section to the reducing place of extracting still out.Two arm directions of quench oil distributor pipe 6 are parallel with tower tray avris downspout or fluid-tight dish 9 exit weirs, and the arm center line is lower than fluid-tight dish exit weir 50～100mm, on the horizontal direction apart from the about 100mm of fluid-tight dish exit weir.Fluid-tight dish exit weir height must guarantee that quench oil can be sprayed onto on the exit weir, is generally 1～2 times of arm diameter after the fluid hole ejection.The resistance coke installation is positioned at the top of extracting still out, forms an annular space with the tower wall, provides the place for liquid fully mixes.
Resistance coke installation set forth in the present invention is applied in the high temperature tower, and general and quench oil system is used, and also can use separately, can effectively stop the tower bottom coke, has following characteristics:
1, resistance coke installation and quench oil distributor pipe can make the high-temp liquid that descends in the tower, rapid mixing abundant with quench oil, reduces fluid temperature rapidly;
2, enter the tower still again after the resistance coke installation can make temperature of high-temp liquid reduce, avoided in the tower still because of liquid mixes the inhomogeneous localized hyperthermia that causes, thereby avoided coking phenomenon;
3, the resistance coke installation can make the less turbulence of liquid flow improve greatly, has both helped temperature and has mixed, and has avoided the formation and the growth of coke granule again.
4, the resistance coke installation can play the effect that stops coke button to enter the tower still.
The decompression tower bottom coke inhibiting device that the present invention proposes, be described by preferred embodiment, person skilled obviously can be changed or suitably change and combination structure as herein described in not breaking away from content of the present invention, spirit and scope, realizes the technology of the present invention.Special needs to be pointed out is, the replacement that all are similar and change apparent to those skilled in the artly, they are regarded as being included in spirit of the present invention, scope and the content.
Claims (10)
1. a decompression tower bottom coke inhibiting device comprises perforated baffle, liquid-blocking cap and bearing rib; It is characterized in that perforated baffle is a cylindrical shape, drum diameter generally is equal to or greater than extracts the still internal diameter out, and the percent opening in the hole on the cylinder is greater than 90%; The liquid-blocking cap external profile diameter is provided with bearing rib greater than perforated baffle between liquid-blocking cap and the perforated baffle.
2. decompression tower bottom coke inhibiting device as claimed in claim 1, the height that it is characterized in that described perforated baffle is 500～1000mm.
3. decompression tower bottom coke inhibiting device as claimed in claim 1 is characterized in that described liquid-blocking cap is taper or disc, and external profile diameter is greater than perforated baffle drum diameter 50～100mm.
4. decompression tower bottom coke inhibiting device as claimed in claim 1 is characterized in that the hole on the described perforated baffle is circular hole or slotted hole or rectangle.
5. the application of decompression tower bottom coke inhibiting device as claimed in claim 1, comprise resistance coke installation and quench oil distributor pipe, it is characterized in that the top that decompression tower bottom coke inhibiting device is installed in the below of stripping section, extracts still out, on the resistance coke installation, be provided with the quench oil distributor pipe.
6. the application of decompression tower bottom coke inhibiting device as claimed in claim 5 is characterized in that described quench oil distributor pipe is connected with the quench oil inlet tube by flange, and arm is a pipe, and the every oblique below of arm is provided with fluid hole.
7. the application of decompression tower bottom coke inhibiting device as claimed in claim 6, it is characterized in that described fluid hole direction is close tower wall side, fluid hole perforate direction and the vertical direction angle to 90 ° at 45, total open area is 0.5～4 times that quench oil is gone into tower house steward area.
8. the application of decompression tower bottom coke inhibiting device as claimed in claim 5 is characterized in that described quench oil distributor pipe is made as " H " shape arm corresponding to top double overflow tower tray or the single overflow tower tray is made as "T"-shaped arm.
9. the application of decompression tower bottom coke inhibiting device as claimed in claim 5 is characterized in that described stripping section is the herringbone baffle arrangement, and the quench oil distributor pipe then is a multi-limbed tube, and every arm symmetry is opened the fluid hole of two rows under oblique, and the perforate direction also is 45 °～90 °.
10. the application of decompression tower bottom coke inhibiting device as claimed in claim 5 is characterized in that: be provided with the resistance coke installation at stripping section to the reducing place of extracting still out; Two arm directions of quench oil distributor pipe are parallel with tower tray avris downspout or fluid-tight dish exit weir, the arm center line is lower than fluid-tight dish exit weir 50～100mm, apart from fluid-tight dish exit weir 80～100mm, fluid-tight dish exit weir height is 1～2 times of arm diameter on the horizontal direction; The resistance coke installation is positioned at the top of extracting still out, forms an annular space with the tower wall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100133691A CN100386127C (en) | 2006-03-24 | 2006-03-24 | Decompression tower bottom coke inhibiting device and its uses |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100133691A CN100386127C (en) | 2006-03-24 | 2006-03-24 | Decompression tower bottom coke inhibiting device and its uses |
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| Publication Number | Publication Date |
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| CN1843549A true CN1843549A (en) | 2006-10-11 |
| CN100386127C CN100386127C (en) | 2008-05-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2006100133691A Expired - Fee Related CN100386127C (en) | 2006-03-24 | 2006-03-24 | Decompression tower bottom coke inhibiting device and its uses |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104998491A (en) * | 2015-07-23 | 2015-10-28 | 北京石油化工工程有限公司 | High pressure hot separator for suspension bed hydrogenation |
| CN111514603A (en) * | 2020-05-09 | 2020-08-11 | 邱尾珠 | Filler formula rectifying column |
| CN112708442A (en) * | 2019-10-24 | 2021-04-27 | 中国石化工程建设有限公司 | Catalytic slurry oil reduced pressure distillation tower and anti-coking method thereof |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61171436A (en) * | 1985-01-23 | 1986-08-02 | Mitsui Eng & Shipbuild Co Ltd | Production of lower olefin |
| CN1100851C (en) * | 2000-04-29 | 2003-02-05 | 中国石化集团洛阳石油化工工程公司 | Suddenly cooling tower and process of resultant from fluidized catalytic transform reaction of hydrocarbons |
| CN1368535A (en) * | 2002-01-12 | 2002-09-11 | 中国石油化工股份有限公司长岭分公司 | Process for preventing coking in catalytic equipment and oil slurry system of fractionating tower |
| US7011740B2 (en) * | 2002-10-10 | 2006-03-14 | Kellogg Brown & Root, Inc. | Catalyst recovery from light olefin FCC effluent |
-
2006
- 2006-03-24 CN CNB2006100133691A patent/CN100386127C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104998491A (en) * | 2015-07-23 | 2015-10-28 | 北京石油化工工程有限公司 | High pressure hot separator for suspension bed hydrogenation |
| CN112708442A (en) * | 2019-10-24 | 2021-04-27 | 中国石化工程建设有限公司 | Catalytic slurry oil reduced pressure distillation tower and anti-coking method thereof |
| CN112708442B (en) * | 2019-10-24 | 2022-11-01 | 中国石化工程建设有限公司 | Catalytic slurry oil reduced pressure distillation tower and anti-coking method thereof |
| CN111514603A (en) * | 2020-05-09 | 2020-08-11 | 邱尾珠 | Filler formula rectifying column |
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| Publication number | Publication date |
|---|---|
| CN100386127C (en) | 2008-05-07 |
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Granted publication date: 20080507 Termination date: 20110324 |