CN1136463A - Vacuum-pumping system for pressure reduced distilling tower - Google Patents
Vacuum-pumping system for pressure reduced distilling tower Download PDFInfo
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- CN1136463A CN1136463A CN 95106867 CN95106867A CN1136463A CN 1136463 A CN1136463 A CN 1136463A CN 95106867 CN95106867 CN 95106867 CN 95106867 A CN95106867 A CN 95106867A CN 1136463 A CN1136463 A CN 1136463A
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Abstract
The evacuating system of the pressure reducing tower top adds the mechanical vacuum pump after the original two stage steam exhausting device to form steam-machinery mixed rarefying system. Owing to the lowering of back pressure of the two stage exhausting device, the improved rarefying system improves the mode of operation of the first and second stage steam vacuum pump, the vacuity and the pressure reducing tower operational elasticity are all raised and steam pressure of the steam exhausting device is lowered, so the energy consumption is greatly lowered. The non condensable gas is burned normally at the nozzle of the heating furnace.
Description
The present invention relates to the vacuum distillation system, particularly the pumped vacuum systems of decompression distillation cat head.
In the atmospheric and vacuum distillation unit of crude oil, decompression cat head pumped vacuum systems generally adopts steam to spray evacuation (abbreviating vacuum jet as) pumped vacuum systems, perhaps adopts mechanical type vavuum pump pumped vacuum systems at present.The vacuum jet pumped vacuum systems generally adopts the second steam pumped vacuum systems, and dry vacuum distillation often adopts three grades of pumped vacuum systems.Second steam pumped vacuum systems decompression cat head residual voltage is generally 3-5KPa, causes the decompression distillation extracting rate low, and the vacuum tower operating flexibility is low.If adopt three grades of steam pumped vacuum systems, though vacuum tower vacuum is improved, steam and cooling water consumption heighten, and plant energy consumption is increased.In addition, vacuum jet is generally wanted the steam of working pressure more than 0.8MPa, when the steam pressure fluctuation, or vacuum tower operation fluctuation, then be easy to cause fluctuation vacuum, influence decompression distillation operation and product quality and yield.
In addition, in the vacuum jet pumped vacuum systems, the pressure of fixed gas first-stage condenser outlet in the end, often approach normal pressure, because pressure is low, fixed gas can not steadily be sent to heating furnace fire and chew burning, fire chew burning constantly the time go out, influence the heating furnace quiet run.
Mechanical type vacuum pumped vacuum systems, though energy consumption is lower owing to reasons such as domestic machine-building, anticorrosion, maintenances, big machinery formula vavuum pump can not the long period safe operation, be unwell on large-scale vacuum distillation apparatus and use, only on the small-sized atmospheric and vacuum distillation unit of crude oil annual working ability below 300,000 tons, use, but equipment corrosion is serious, the maintenance cost height.
The objective of the invention is to improve the vacuum tower pumped vacuum systems, improve vacuum tower vacuum, reduce the used energy consumption of pumped vacuum systems, reduce the steam pressure of vacuum jet, improve the vacuum tower operating flexibility, make vacuum tower vacuum not be subjected to the influence of the fluctuation of the steam pressure fluctuation of vacuum jet or vacuum tower technological operation, to improve the quality of products and extracting rate.In addition, go after the last suitable supercharging of fixed gas of discharging of pumped vacuum systems that heating furnace fire is chewed, smooth combustion.
The present invention is achieved in that at the condensator outlet of the afterbody vacuum jet of decompression overhead vapours pumped vacuum systems and sets up the mechanical type vacuum pumping pump.
In enforcement of the present invention, decompression overhead oil vapour and fixed gas order is through first-stage condenser, the one-level vacuum jet, and secondary condenser, second steam evacuation, three grades of condensers, wherein fixed gas is delivered to heating furnace fire and chews burning.Improvement of the present invention is the import that connects the mechanical type vavuum pump in the outlet of three grades of condensers, and fixed gas is after the suction of mechanical type vavuum pump, and the compressed heating furnace fire that is sent to is chewed burning.After the mechanical type vavuum pump can be connected on the second steam evacuation, also can be connected on after three grades of steam find time.
The mechanical type vacuum pumping pump can adopt water-ring vacuum pump or reciprocating vacuum pump.
Advantage of the present invention is, behind vacuum jet, set up the mechanical type vacuum pumping pump, become steam---mechanical mixture formula pumped vacuum systems, reduced the back pressure of second steam evacuation outlet like this, drop to 450mmHg by approaching normal pressure, improved the operating condition of vacuum jets at different levels, serious reciprocal of duty cycle of vacuum tower and vacuum tower fractionating effect have been improved, the steam pressure of the former use of vacuum jet 1.8MPa can use the steam of 0.40MPa pressure to save a large amount of steam after the improvement, the power consumption of mechanical type vavuum pump that deduction increases and water consumption, total system energy consumption has bigger decline, after adopting method of the present invention, vacuum tower vacuum improves greatly, and stable operation and elasticity increase, to the decompression tower top temperature, the vacuum tower liquid level, the fluctuation of feeding temperature, vacuum is unaffected substantially, also is not subjected to steam pressure, condenser cooling water pressure, the influence of temperature fluctuation, fixed gas by the supercharging of mechanical type vavuum pump after, be sent to heating furnace fire and chew, burning is normal.
Further specify details of the present invention with reference to the accompanying drawings.
Figure one, former decompression overhead vapours pumped vacuum systems.
Figure two, decompression overhead vapours---mechanical mixture formula pumped vacuum systems
Among the figure: 1, vacuum tower; 2, first-stage condenser; 3, one-level vacuum jet; 4, secondary condenser; 5, second steam evacuation; 6, three grades of condensers; 7, heating furnace; 8, water-ring vacuum pump.
Embodiment:
Vacuum tower (1) oily vapour in top and fixed gas enter first-stage condenser (2) in proper order, one-level vacuum jet (3), secondary condenser (4), second steam evacuation (5), three grades of condensers (6), enter water-ring vacuum pump (8) then, fixed gas is sent to heating furnace (7) fire and is chewed burning after the water-ring vacuum pump supercharging.
Water-ring vacuum pump is the SZ-2 type, 11KW/h.
Decompression cat head pumped vacuum systems, operating condition contrast before and after improving is referring to table 1.By table 1 as seen, set up mechanical vacuum pumping pump, can make vacuum tower feed zone vacuum be increased to 671mmHg by 645mmHg.After setting up water-ring vacuum pump, the condensator outlet back pressure of second level vacuum jet drops to 432mmHg by original near normal pressure (approximately 700mmHg), therefore improved the operating condition of vacuum jet, not only improved vacuum, and steam consumption has reduced greatly.
Before and after pumped vacuum systems is improved, the contrast of vacuum tower operating flexibility, referring to table 2, by table 2 as seen, hybrid pumped vacuum systems makes the vacuum tower smooth operation, and operating flexibility improves greatly, helps the oil plant safety in production.
The water-ring vacuum pump outlet pressure is 0.025MPa, is sent to heating furnace fire after the fixed gas compression and chews burning, the flame stable and continuous.
Adopt steam---after the mechanical mixture formula pumped vacuum systems, steam consumption decline 0.75t/ hour, can convert into 57kg mark oil/hour; Power consumption 11Kw/ hour, convert into 3.3kg mark oil/hour; Water consumption 1.2t/ hour, convert into 0.12kg mark oil/hour.
The total energy consumption of pumped vacuum systems drops to
57-3.3-0.12=53.56kg mark oil/hour
Annual by processing 1,800,000 tons of crude oil 8000 hours, energy-conservation unit consumption is a 0.238kg mark oil/ton crude oil.
Operating condition contrast table 1 before and after pumped vacuum systems is improved
| Project | Before improving (steam is found time) | Improve back (hybrid finding time) |
| Processing capacity (ton per day) | ????5300 | ????5300 |
| Local atmospheric pressure (mmHg) | ????696.25 | ????706 |
| Top vacuum degree mmHg | ????667 | ????693 |
| Cat head residual voltage KPa | ????3.9 | ????1.73 |
| Tower feed zone vacuum mmHg | ????645 | ????671 |
| Tower charging residual voltage KPa | ????6.83 | ????4.6 |
| Steam advances I and II evacuation pressure MPa | ????0.8 | ????0.4 |
| The pocket steam consumption t/h of steam | ????1.5 | ????0.75 |
| Water-ring vacuum pump inlet pressure mmHg | ????432 | |
| Water-ring vacuum pump outlet pressure MPa | ????0.025 |
Vacuum tower operating flexibility contrast table 2 before and after pumped vacuum systems is improved
| Operational circumstances | Before the improvement | After the improvement |
| Tower top temperature＞128 ℃ | Vacuum descends | Vacustat |
| When liquid level is too high at the bottom of the tower | ????″ | ″ |
| Feeding temperature＞390 ℃ | ????″ | ″ |
| Steam pressure＜the 0.78MPa of system | ????″ | When pressure was reduced to 0.45MPa, vacuum still can guarantee |
| Circulating water pressure＜3.5MPa | ????″ | Vacustat |
| Vacuum jet steam consumption＜1.5t/h | ????″ | Steam consumption is reduced to 0.75t/h, vacuum the best |
Claims (3)
1, vacuum-pumping system for pressure reduced distilling tower comprises condenser, vacuum jet and is attached thereto the pipeline that connects, and it is characterized in that setting up the mechanical type vacuum pumping pump on the condensator outlet line behind the decompression cat head afterbody vacuum jet.
2, pumped vacuum systems according to claim 1, the cat head pumped vacuum systems that it is characterized in that reducing pressure can also can link the mechanical type vavuum pump after three grades of steam are found time after second steam is found time, form steam---mechanical mixture formula pumped vacuum systems.
2, pumped vacuum systems according to claim 1 and 2 is characterized in that the mechanical type vavuum pump can be with water-ring vacuum pump or reciprocating vacuum pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95106867 CN1054312C (en) | 1995-05-23 | 1995-06-27 | Vacuum-pumping system for pressure reduced distilling tower |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95211964 | 1995-05-23 | ||
| CN95211964.1 | 1995-05-23 | ||
| CN 95106867 CN1054312C (en) | 1995-05-23 | 1995-06-27 | Vacuum-pumping system for pressure reduced distilling tower |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1136463A true CN1136463A (en) | 1996-11-27 |
| CN1054312C CN1054312C (en) | 2000-07-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 95106867 Expired - Fee Related CN1054312C (en) | 1995-05-23 | 1995-06-27 | Vacuum-pumping system for pressure reduced distilling tower |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1054312C (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100488589C (en) * | 2006-02-20 | 2009-05-20 | 李志平 | Distillation apparatus with rectification function |
| CN101935546A (en) * | 2010-08-31 | 2011-01-05 | 中山凯旋真空技术工程有限公司 | Crude oil vacuum-treatment device |
| CN102441287A (en) * | 2010-10-13 | 2012-05-09 | 中国石油化工股份有限公司 | Novel pressure-reducing distillation tower |
| CN102443408A (en) * | 2010-10-13 | 2012-05-09 | 中国石油化工股份有限公司 | Pressure reduction distillation process method |
| CN104274991A (en) * | 2013-07-03 | 2015-01-14 | 中国石化工程建设有限公司 | Multi-point vacuum pumping system and multi-point vacuum pumping method |
| CN105238436A (en) * | 2015-08-25 | 2016-01-13 | 海南汉地阳光石油化工有限公司 | Decompression vacuum extraction system, decompression system, and method for extracting agricultural lubricating oil |
| CN106643204A (en) * | 2017-01-05 | 2017-05-10 | 陆明 | Three-stage switchable steam jetting and vacuumizing system low in steam consumption |
| CN114177639A (en) * | 2021-11-30 | 2022-03-15 | 石化盈科信息技术有限责任公司 | Method for determining tower top pressure of reduced pressure distillation tower, storage medium and equipment |
-
1995
- 1995-06-27 CN CN 95106867 patent/CN1054312C/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100488589C (en) * | 2006-02-20 | 2009-05-20 | 李志平 | Distillation apparatus with rectification function |
| CN101935546A (en) * | 2010-08-31 | 2011-01-05 | 中山凯旋真空技术工程有限公司 | Crude oil vacuum-treatment device |
| CN101935546B (en) * | 2010-08-31 | 2013-04-10 | 中山凯旋真空技术工程有限公司 | Crude oil vacuum-treatment device |
| CN102441287A (en) * | 2010-10-13 | 2012-05-09 | 中国石油化工股份有限公司 | Novel pressure-reducing distillation tower |
| CN102443408A (en) * | 2010-10-13 | 2012-05-09 | 中国石油化工股份有限公司 | Pressure reduction distillation process method |
| CN102443408B (en) * | 2010-10-13 | 2014-05-21 | 中国石油化工股份有限公司 | Pressure reduction distillation process method |
| CN102441287B (en) * | 2010-10-13 | 2014-08-20 | 中国石油化工股份有限公司 | Novel pressure-reducing distillation tower |
| CN104274991A (en) * | 2013-07-03 | 2015-01-14 | 中国石化工程建设有限公司 | Multi-point vacuum pumping system and multi-point vacuum pumping method |
| CN104274991B (en) * | 2013-07-03 | 2016-12-28 | 中国石化工程建设有限公司 | A kind of multiple spot pumped vacuum systems and multiple spot vacuum pumping method |
| CN105238436A (en) * | 2015-08-25 | 2016-01-13 | 海南汉地阳光石油化工有限公司 | Decompression vacuum extraction system, decompression system, and method for extracting agricultural lubricating oil |
| CN106643204A (en) * | 2017-01-05 | 2017-05-10 | 陆明 | Three-stage switchable steam jetting and vacuumizing system low in steam consumption |
| CN114177639A (en) * | 2021-11-30 | 2022-03-15 | 石化盈科信息技术有限责任公司 | Method for determining tower top pressure of reduced pressure distillation tower, storage medium and equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1054312C (en) | 2000-07-12 |
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