CN110237557B - Fractionating tower - Google Patents
Fractionating tower Download PDFInfo
- Publication number
- CN110237557B CN110237557B CN201910536981.4A CN201910536981A CN110237557B CN 110237557 B CN110237557 B CN 110237557B CN 201910536981 A CN201910536981 A CN 201910536981A CN 110237557 B CN110237557 B CN 110237557B
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- China
- Prior art keywords
- plate
- baffle
- distributor
- double
- overflow
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 230000003014 reinforcing effect Effects 0.000 claims description 31
- 238000005194 fractionation Methods 0.000 claims description 15
- 229910001220 stainless steel Inorganic materials 0.000 claims description 11
- 239000010935 stainless steel Substances 0.000 claims description 11
- 239000007788 liquid Substances 0.000 claims description 9
- 239000007791 liquid phase Substances 0.000 abstract description 23
- 239000012071 phase Substances 0.000 abstract description 9
- 239000003595 mist Substances 0.000 abstract description 5
- 238000004939 coking Methods 0.000 abstract description 4
- 238000009826 distribution Methods 0.000 description 21
- 239000007789 gas Substances 0.000 description 7
- 239000002283 diesel fuel Substances 0.000 description 5
- 239000007792 gaseous phase Substances 0.000 description 3
- 238000012797 qualification Methods 0.000 description 3
- 238000004523 catalytic cracking Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/14—Fractional distillation or use of a fractionation or rectification column
- B01D3/16—Fractionating columns in which vapour bubbles through liquid
- B01D3/24—Fractionating columns in which vapour bubbles through liquid with sloping plates or elements mounted stepwise
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/14—Fractional distillation or use of a fractionation or rectification column
- B01D3/32—Other features of fractionating columns ; Constructional details of fractionating columns not provided for in groups B01D3/16 - B01D3/30
- B01D3/324—Tray constructions
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
Abstract
The invention discloses a fractionating tower.A distributor is arranged on a double-overflow tower plate and can redistribute a liquid phase and a gas phase of the double-overflow tower plate, specifically, the redistribution is that a downcomer redistributes the liquid phase according to the liquid phase resistance on the double-overflow tower plate, thereby avoiding the unsmooth circulation of a middle downcomer, eliminating the leakage at an inlet of the double-overflow tower plate, and simultaneously, the gas phase positioned under the double-overflow tower plate is redistributed according to the liquid phase resistance on the double-overflow tower plate, eliminating the phenomenon of serious entrainment of mist at an outlet of the tower plate, thereby avoiding the coking of the tower plate.
Description
Technical Field
The invention relates to the technical field of catalytic cracking, in particular to a fractionating tower.
Background
After the catalytic cracking device of Jingbo petrochemical 200 ten thousand tons/year is reformed, the gas phase quantity of the main fractionating tower is increased, the opening rate of the double overflow tower plate of the corresponding main fractionating tower is also increased, wherein the 26# to 30# double overflow tower plate of the main fractionating tower adopts a fixed tongue-shaped double overflow tower plate.
As the liquid phase load and the gas phase load of the main fractionating tower are both large, the 26# -30# double overflow tower plate is easy to generate amplification effect, so that the inlet of the double overflow tower plate is leaked, the entrainment of the mist at the outlet of the double overflow tower plate is serious, the gap between the downcomer and the liquid receiving groove is reduced, the liquid phase in the downcomer is not smooth to circulate, the pressure drop of the main fractionating tower is increased, the thickness of the liquid phase layer of the double overflow tower plate is increased, the chromaticity of the diesel oil processed by the main fractionating tower is higher, and the diesel oil product is unqualified.
Therefore, how to avoid the phenomena of leakage at the inlet of the double overflow tower plate and serious entrainment at the outlet of the double overflow tower plate so as to improve the qualification rate of the diesel oil becomes a technical problem to be solved urgently by technical personnel in the field.
Disclosure of Invention
In view of this, the invention provides a fractionating tower to avoid the phenomena of leakage at the inlet of a double overflow tray and serious entrainment at the outlet of the double overflow tray, so as to improve the qualification rate of diesel oil.
In order to achieve the purpose, the invention provides the following technical scheme:
a fractionation column, comprising:
the middle part of the double overflow tower plate is provided with a downcomer;
a distributor capable of redistributing liquid, wherein the distributor is arranged at the inlet of the downcomer and protrudes out of the upper end surface of the double overflow tower plate.
Preferably, in the above fractionation column, the distributor comprises:
baffles for dividing the liquid on both sides of the downcomer;
the flow distribution plates are fixed on the inlet, one end of each flow distribution plate is connected with the lower end of the baffle, the other end of each flow distribution plate is connected with the inlet of the downcomer, the number of the flow distribution plates is multiple, the flow distribution plates are symmetrically distributed on two sides of the baffle, and flow distribution holes are formed between the adjacent flow distribution plates located on the same side of the baffle.
Preferably, in the above fractionation tower, the splitter plate is a trapezoidal splitter plate, and the width of the upper end of the trapezoidal splitter plate is smaller than the width of the lower end of the trapezoidal splitter plate.
Preferably, in the fractionating tower, an included angle between the splitter plate and the baffle is 45-60 °.
Preferably, in the above fractionation column, the distributor further comprises:
the reinforcing plate is connected with the upper end of the baffle.
Preferably, in the fractionation column, the number of the reinforcing plates is plural, and the reinforcing plates are symmetrically distributed on both sides of the baffle plate in the longitudinal direction.
Preferably, in the fractionating tower, an included angle between the reinforcing plate and the baffle is 45-60 °.
Preferably, in the above fractionation tower, the baffle is a stainless steel baffle, the splitter plate is a stainless steel splitter plate, and the reinforcing plate is a stainless steel reinforcing plate.
Preferably, in the above fractionation column, the baffle plate is welded to the dividing plate, and the baffle plate is welded to the reinforcing plate.
According to the technical scheme, the distributor is arranged on the double-overflow tower plate and can redistribute the liquid phase and the gas phase of the double-overflow tower plate, specifically, the redistribution is that the liquid phase is redistributed by the downcomer according to the liquid phase resistance on the double-overflow tower plate, the middle downcomer is prevented from flowing unsmoothly, leakage at the inlet of the double-overflow tower plate is eliminated, meanwhile, the gas phase under the double-overflow tower plate is redistributed according to the liquid phase resistance on the double-overflow tower plate, and the phenomenon of serious entrainment of mist at the outlet of the tower plate is eliminated, so that the coking tower plate is avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a front view of a fractionation column according to an embodiment of the present invention;
FIG. 2 is a left side view of a fractionation column according to an embodiment of the present invention;
fig. 3 is a top view of a fractionation column according to an embodiment of the present invention.
Wherein:
1. double overflow tower plate, 11, down-flow spout, 2, baffle, 3, flow distribution plate, 4, reinforcing plate.
Detailed Description
The invention discloses a fractionating tower, which is used for avoiding the phenomena of leakage of a double-overflow tower plate inlet and serious entrainment of mist at a double-overflow tower plate outlet so as to improve the qualification rate of diesel oil.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention discloses a fractionating tower which comprises a double overflow tower plate 1 and a distributor.
The double overflow tower plate 1 can be used for fully contacting and mixing the liquid phase and the gas phase on the double overflow tower plate, thereby realizing heat and mass transfer.
The middle part of the double overflow tower plate 1 is provided with a downcomer 11, the inlet of the downcomer 11 is provided with a distributor, and the distributor protrudes out of the upper end face of the double overflow tower plate 1, so that the liquid phase can pass through the distributor before entering the downcomer 11.
Specifically, the liquid phase on the double overflow tray 1 enters the downcomer 11 after passing through the distributor, and then falls to the next double overflow tray 1 through the downcomer 11, and the liquid phase on the next double overflow tray 1 falls through the downcomers 11 on both sides.
The fractionating tower that this scheme provided, the distributor has been installed on two overflow column plates 1, the distributor can carry out the redistribution to the liquid phase and the gaseous phase of two overflow column plates 1, it is specific, the redistribution is that downcomer 11 redistributes the liquid phase according to the liquid phase resistance on two overflow column plates 1, it is not smooth to avoid middle downcomer 11 to circulate, eliminate two overflow column plate 1 entrances and reveal, the gaseous phase that lies in under two overflow column plates 1 simultaneously also redistributes according to the liquid phase resistance on two overflow column plates 1, eliminate column plate outlet mist and smuggle serious phenomenon secretly, thereby avoid the coking column plate.
Furthermore, the distributor can redistribute the liquid phase, so that the gas phase and the liquid phase are fully contacted, and the separation efficiency and the processing quality of the fractionating tower are improved. In a particular embodiment of the solution, the distributor comprises a baffle 2 and a splitter plate 3.
The baffle 2 is used for shunting liquid at two sides of the downcomer 11 and preventing liquid phases at two sides of the downcomer 11 and gas phases at two sides of the downcomer of the double overflow tower plate 1 from being mixed;
the flow distribution plate 3 is fixed at the inlet of the downcomer 11 and connected with the baffle 2, specifically, one end of the flow distribution plate 3 is connected with the lower end of the baffle 2, and the other end is connected with the inlet side wall of the downcomer 11, as shown in fig. 1 and 2, the flow distribution plate 3 is perpendicular to the baffle 2, and the thickness of the flow distribution plate 3 along the length direction of the baffle 2 is very small, about 10-20 mm.
In this scheme, the number of flow distribution plate 3 is a plurality of and the symmetric distribution forms the reposition of redundant personnel hole between two adjacent flow distribution plates 3 that are located baffle 2 homonymy, and liquid phase and gaseous phase flow through the reposition of redundant personnel hole.
In one embodiment of the present embodiment, as shown in fig. 1 and 2, the distributor is disposed on the downcomer 11 of the 26# double overflow tray, the 28# double overflow tray and the 30# double overflow tray of the fractionating tower, and the tongue-fixing tray is adopted for the 26# double overflow tray, the 28# double overflow tray and the 30# double overflow tray. The fractionating tower provided with the distributor has no abnormal pressure drop and no entrainment and coking phenomena under the normal operation condition.
In a specific embodiment of the present embodiment, the number of the baffles 2 is 3, i.e. 1 baffle 2 is respectively arranged on the 26# double overflow tray, the 28# double overflow tray and the 30# double overflow tray of the fractionating tower, and the number of the splitter plates 3 is 18, i.e. 6 splitter plates 3 are respectively arranged on the 26# double overflow tray, the 28# double overflow tray and the 30# double overflow tray of the fractionating tower, and the 6 splitter plates 3 are symmetrically distributed on two sides of the baffles 2.
As shown in fig. 2, the splitter plate 3 is a trapezoidal splitter plate, and the width of the upper end of the trapezoidal splitter plate is smaller than that of the lower end of the trapezoidal splitter plate. The diffluence orifice that forms between adjacent flow distribution plate 3 is tubaeform diffluence orifice, and liquid gets into from the less one end of size in diffluence orifice, discharges through the great one end of size in diffluence orifice for the discharge rate of liquid, has further played the effect of optimizing the liquid velocity of flow, further alleviates the unusual problem of pressure drop.
In a particular embodiment of the solution the angle between the splitter plate 3 and the baffle 2 is 45-60 °. Preferably, the angle between the splitter plate 3 and the baffle 2 is 45 °.
In order to further optimize the above technical solution, the distributor further comprises a reinforcing plate 4, and the reinforcing plate 4 is connected with the upper end of the baffle 2 and used for enhancing the strength of the baffle 2.
The number of the reinforcing plates 4 is multiple, and the reinforcing plates are symmetrically distributed on two sides of the baffle 2 in the length direction.
In a specific embodiment of the present embodiment, the number of the baffles 2 is 3, i.e. 1 baffle 2 is respectively arranged on the 26# double overflow tray, the 28# double overflow tray and the 30# double overflow tray of the fractionating tower, the number of the splitter plates 3 is 18, i.e. 6 splitter plates 3 are respectively arranged on the 26# double overflow tray, the 28# double overflow tray and the 30# double overflow tray of the fractionating tower, the 6 splitter plates 3 are symmetrically distributed on both sides of the baffle 2, the number of the reinforcing plates is 6, i.e. 2 reinforcing plates 4 are respectively arranged on the 26# double overflow tray, the 28# double overflow tray and the 30# double overflow tray of the fractionating tower, and the 2 reinforcing plates 4 are symmetrically distributed on both sides of the baffle 2.
The number of the reinforcing plates 4 and the flow dividing plates 3 is not limited to the above-described embodiment, and may be adjusted according to actual production conditions.
The included angle between the reinforcing plate 4 and the baffle 2 is 45-60 degrees, and the reinforcing plate 4 is parallel to the baffle 2.
As shown in fig. 2, the angle between the reinforcing plate 4 and the baffle 2 is 45 °.
Preferably, the baffle 2 is a stainless steel baffle, the flow distribution plate 3 is a stainless steel flow distribution plate, and the reinforcing plate 4 is a stainless steel reinforcing plate. The baffle 2, the flow distribution plate 3 and the reinforcing plate 4 made of stainless steel materials have high strength, can ensure the service life of the distributor, and the cost of the stainless steel is relatively low, so that the cost of the distributor is reduced to a certain extent.
Specifically, the baffle 2 is welded with the splitter plate 3, the baffle 2 is welded with the reinforcing plate 4, and the splitter plate 3 is welded with the double-overflow tower plate 1. The welding process is simple, easy to operate, and the connection strength of the baffle 2, the splitter plate 3 and the reinforcing plate 4 and the connection strength of the distributor and the double-overflow tower plate 1 can be ensured.
In another specific embodiment of this scheme, baffle 2 and flow distribution plate 3, and baffle 2 and reinforcing plate 4 can also adopt bolted connection or riveted connection, and flow distribution plate 3 and two overflow column plate 1 can also adopt bolted connection or riveted connection.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. A fractionation column, comprising:
the double-overflow tower plate (1), wherein a downcomer (11) is arranged in the middle of the double-overflow tower plate (1);
a distributor capable of redistributing liquid, arranged at the inlet of the downcomer (11) and protruding above the upper end face of the double overflow tray (1);
the dispenser includes:
a baffle (2) for dividing the liquid on both sides of the downcomer (11);
the distributor comprises a distributor plate (3) fixed on an inlet, one end of the distributor plate (3) is connected with the lower end of a baffle (2), the other end of the distributor plate (3) is connected with an inlet of a downcomer (11), the number of the distributor plates (3) is multiple, the distributor plates are symmetrically distributed on two sides of the baffle (2), a distributor hole is formed between every two adjacent distributor plates (3) on the same side of the baffle (2), the distributor plates (3) are trapezoidal distributor plates, and the width of the upper ends of the trapezoidal distributor plates is smaller than the width of the lower ends of the trapezoidal distributor plates.
2. A fractionation column according to claim 1, wherein the angle between the splitter plate (3) and the baffle plate (2) is 45-60 °.
3. The fractionation column of claim 1, wherein the distributor further comprises:
the reinforcing plate (4), reinforcing plate (4) with the upper end of baffle (2) is connected.
4. A fractionating column according to claim 3, wherein the number of the reinforcing plates (4) is plural and symmetrically distributed on both sides of the baffle plate (2) in the longitudinal direction.
5. A fractionation column according to claim 3, wherein the angle between the reinforcing plate (4) and the baffle (2) is 45-60 °.
6. A fractionation column according to claim 3, wherein the baffle (2) is a stainless steel baffle, the splitter plate (3) is a stainless steel splitter plate, and the reinforcing plate (4) is a stainless steel reinforcing plate.
7. A fractionating column according to claim 5, wherein the baffle (2) is welded to the splitter plate (3) and the baffle (2) is welded to the stiffening plate (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910536981.4A CN110237557B (en) | 2019-06-20 | 2019-06-20 | Fractionating tower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910536981.4A CN110237557B (en) | 2019-06-20 | 2019-06-20 | Fractionating tower |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110237557A CN110237557A (en) | 2019-09-17 |
| CN110237557B true CN110237557B (en) | 2021-09-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910536981.4A Active CN110237557B (en) | 2019-06-20 | 2019-06-20 | Fractionating tower |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110237557B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1294936A (en) * | 2000-08-29 | 2001-05-16 | 罗固事 | Convective column plate |
| CN1400915A (en) * | 2000-02-16 | 2003-03-05 | 国际壳牌研究有限公司 | Vapor-liquid contacting trays with multiple downcomers |
| CN201596497U (en) * | 2009-11-10 | 2010-10-06 | 天津大沽化工股份有限公司 | Novel saponification tower device |
| CN101874933A (en) * | 2009-12-03 | 2010-11-03 | 中国石油天然气集团公司 | A Compound Overflow Weir for Promoting Vapor-Liquid Separation |
| CN102698456A (en) * | 2012-05-31 | 2012-10-03 | 南京德邦金属装备工程股份有限公司 | V-shaped down-flow pipe |
-
2019
- 2019-06-20 CN CN201910536981.4A patent/CN110237557B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1400915A (en) * | 2000-02-16 | 2003-03-05 | 国际壳牌研究有限公司 | Vapor-liquid contacting trays with multiple downcomers |
| CN1294936A (en) * | 2000-08-29 | 2001-05-16 | 罗固事 | Convective column plate |
| CN201596497U (en) * | 2009-11-10 | 2010-10-06 | 天津大沽化工股份有限公司 | Novel saponification tower device |
| CN101874933A (en) * | 2009-12-03 | 2010-11-03 | 中国石油天然气集团公司 | A Compound Overflow Weir for Promoting Vapor-Liquid Separation |
| CN102698456A (en) * | 2012-05-31 | 2012-10-03 | 南京德邦金属装备工程股份有限公司 | V-shaped down-flow pipe |
Non-Patent Citations (1)
| Title |
|---|
| 催化裂化装置采油色号异常分析与应对措施;史会兵等;《炼油与化工》;20180415;第29卷(第2期);第13页 * |
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| Publication number | Publication date |
|---|---|
| CN110237557A (en) | 2019-09-17 |
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| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: A fractionator Effective date of registration: 20220718 Granted publication date: 20210924 Pledgee: Societe Generale Bank Limited by Share Ltd. Binzhou branch Pledgor: SHANDONG CHAMBROAD PETROCHEMICALS Co.,Ltd. Registration number: Y2022980010700 |
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| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20230921 Granted publication date: 20210924 Pledgee: Societe Generale Bank Limited by Share Ltd. Binzhou branch Pledgor: SHANDONG CHAMBROAD PETROCHEMICALS Co.,Ltd. Registration number: Y2022980010700 |