CN2441535Y - High performance inlet and outlet weir - Google Patents
High performance inlet and outlet weir Download PDFInfo
- Publication number
- CN2441535Y CN2441535Y CN 00233539 CN00233539U CN2441535Y CN 2441535 Y CN2441535 Y CN 2441535Y CN 00233539 CN00233539 CN 00233539 CN 00233539 U CN00233539 U CN 00233539U CN 2441535 Y CN2441535 Y CN 2441535Y
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- China
- Prior art keywords
- weir
- plate
- liquid
- downspout
- column plate
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- Separation By Low-Temperature Treatments (AREA)
Abstract
The utility model relates to a weir which is mainly used in a fractionating tower in a petroleum and a chemistry process industries. The utility model comprises a weir plate, an opening pore structure and an air guide structure, the structure can adjust liquid flow direction on a tower plate and the flow distribution, and the contact situation of air and liquid on the tower plate is improved. 2-10% of the tower plate efficiency can be improved, the overflow intensity on the weir can be reduced because the length of the weir is long, and 10-20% of the process capability can be improved. The utility model can be especially suitable for loading operation with large liquid phase. The opening hole and the air guide structures can be arranged on the weir, a part of liquid flows from a small hole, the trend of forming vortex flow is lightened, the leakage of an inlet of the tower plate is reduced, the height of liquid layer and the tower pressure are reduced, the gas and liquid separation in a liquid falling pipe is promoted, and the operation stability is enhanced.
Description
The utility model is that an a kind of class high-performance that is used for oil and chemical process industry (CPI) fractionating column is gone into, exit weir.
Tower is a unit the most frequently used in the lock out operation, can be divided into plate column and packed tower by the difference of the vapour-liquid way of contact, and this tower of two types each has different characteristics, is applicable to different production occasions, and deposits development.
The inner member of plate column mainly is made of column plate and downspout.For the liquid phase that flows on the vapour phase that rises by column plate and the plate is fully contacted, must on column plate, keep certain thickness liquid layer, usually exit weir (also claiming downflow weir) is set in column plate liquid flow export and the downspout position that links to each other that enters the mouth.Downflow weir is high more, and liquid layer is thick more, and vapour-liquid is long more time of contact, and mass-transfer efficiency is also just high more, but gas phase is also big more by the resistance that column plate need overcome, and the pressure of column plate falls also just big more.In addition, on column plate liquid inflow entrance position, also the weir can be set, be called the inlet weir.
Current focus to the research and development of plate column internals mainly concentrates on column plate, downspout and the bubbling element, and few to the research on weir, the structure of selecting for use in industrial reality is more fixing.At present the most frequently used is the Ping Kou weir, and weir plate is plate always, and upper limb is straight, and is simple in structure, uses very general; Another kind is the profile of tooth weir, and the difference on profile of tooth weir and Ping Kou weir is that the upper limb on weir is a zigzag, is applicable to the situation of low liquid phase load, to guarantee the liquid flow on the column plate bias current does not take place, keeps normal distribution.These two kinds of structures are for generally adopting both at home and abroad.Up to the present, about the patent and the proprietary technology on weir very rare, wherein the patent No. is 96205153.5, name is called " the novel downspout that has side-blown cellular type exit weir " and relates to a kind of novel weir structure, its feature is: the inlet weir links to each other with downspout, has the leg-of-mutton structure of folding, have the side-blown hole on the weir, some blows out by side opening from the following air-flow that rises of column plate, utilize the impetus of this part air-flow, can reduce liquid layer thickness on the plate, reduce plate pressure drop, improve disposal ability.Also has a kind of grid weir (Picket Fence Weirs) abroad, the rectangular dentation in weir plate top on grid weir, under same downspout chord length, the weir on grid weir is longer, can reduce weir overflow intensity of flow, weir plate also can partly play the effect that erosion control spatters baffle plate, and to requirement that levelness is installed less than the profile of tooth weir, generally be used for three overflows or multi-overflow column plate.
By analysis-by-synthesis, structurally there are some problems in existing weir, particularly to the tower of big liquid measure and pressurized operation.Be embodied in following several aspect:
(1) when liquid load is big, kinetic energy when liquid flows into column plate by downspout is bigger, according to inertia, it has the trend of crossing column plate along linear flow, adds the retardation of arch area tower wall to liquid, make liquid on the column plate from the column plate center to forming a velocity gradient near the arch area tower wall, the main flow area velocity gradient is little and the arch area velocity gradient is big, cause liquid stream uneven distribution, thereby produce famous liquid " stagnant area ", cause the reduction of plate efficiency.Eliminating and improving liquid holding zone is one of emphasis direction of domestic and international research and development always.
(2) cross exit weir when liquid and be " waterfall " when shape is dirty, because percussion, in downspout, form vortex easily, quicken the collapse of bubbles of carrying secretly in the liquid in the downspout and and fluid separation applications, isolated gas phase forms in downspout " cavity " owing to the obstruction of liquid " waterfall " is difficult to overflow from downspout, stops downward the flowing of normal liquid, reduce the liquid flow ability of downspout, especially under the situation of big liquid measure.Gas constantly accumulation in " cavity " owing to constantly breaking of bubble in the downspout, when the resistance of the big dry liquids of its pressure " waterfall ", will wash liquid open and discharge, accumulation more subsequently, go round and begin again, the liquid flow that causes downspout is pulsed, and has reduced the stability of operation, and makes the tower operation produce fluctuation.
(3) in many easy foaming systems, bubble separation needs the long time of staying in the downspout, or the big downspout of design, or increases tower diameter, causes the tower of very big uneconomical design, especially pressurized operation.
(4) upper limb on common Ping Kou weir is straight, weir plate also is straight, air line distance is the shortest, thereby the weir is long minimum, under the identical liquid measure, and overflow intensity maximum, tower design easily cause tower diameter to increase or the downspout area bigger, make the effective mass-transfer zone area of column plate reduce, so use on the Ping Kou weir limitation is arranged under high throughput, these problems are particularly outstanding in pressurizing tower.
(5) when the tower capacity expansion revamping, need to enlarge the downcomer outlet port clearance height regularly, usually make the effect of downcomer seal dish lose efficacy after the expansion, easily cause fluid-tight failure and column plate inlet liquid flow impact too big, make and tower operating characteristics variation adopt reasonably inlet weir design very important.When liquid flooding is crossed conventional straight inlet weir, easily form the vortex disturbance, can increase liquid level drop on the plate, cause the column plate liquid fluctuating, the leakage of aggravation column plate porch at inlet rear portion, weir.
The problems referred to above are confirmed by laboratory test, engineering experience and industry reality.
It is a kind of novel, efficient and be applicable to various liquid loads that the purpose of this utility model is to provide, be specially adapted to big liquid measure, can effectively improve the liquid distribution situation on the column plate, reducing column plate pressure falls, reducing the column plate inlet leaks, the vapour that reduces liquid in the downspout contains rate, realizes improving mass-transfer efficiency, and a class high-performance that increases disposal ability is gone into, exit weir.
The utility model mainly is achieved in that column plate 3 in plate column 2, column plate 3 links to each other with downspout 4, outlet and downspout 4 connecting places at column plate 3 are provided with exit weir 1, be provided with inlet weir 1 in column plate 3 porch, weir 1 is made up of weir plate 101, perforate 102, gas-guiding structure 103, perforate 102 is arranged on weir plate 101 and be provided with gas-guiding structure 103.
The upper limb shape of weir plate 101 can be arc, trapezoidal or other any middle high, low curve in two ends.
The shape of weir plate 101 can be straight plate, also can be arc, trapezoidal or other curved surface.
The upper limb shape of weir plate 101 can be smooth limit, also can be profile of tooth.
On the weir plate 101 perforate 102 can be arranged, also can not have perforate 102.
On the weir plate 101 gas-guiding structure 103 can be arranged, also can not have gas-guiding structure 103.
Advantage of the present utility model is:
1, compares with conventional weir, when liquid flows through the inlet weir, can adjust flow distribution, two ends, weir flow is bigger, successively decreases to the centre gradually, and the liquid measure that promptly flows to column plate both sides arch area increases relatively, make the situation of liquid holding zone and back-mixing improve or eliminate, liquid distribution on the column plate significantly improves, and the stagnant area area reduces, and plate efficiency can improve about 2～10%. Simultaneously can also change liquid flow direction, make and flow radially when liquid enters column plate that the liquid distribution on the column plate significantly improves, the stagnant area area reduces, and plate efficiency improves.
2, use traditional exit weir, be difficult to reach the requirement of design flexibility, the utility model then can solve this class problem preferably, and under same downspout chord length, weir of the present utility model is longer, can effectively reduce overflow intensity, simultaneously, when the weir plate upper limb adopts serrated edge, also can normal running under low liquid measure, so it is about 10～20% that the operating flexibility scope can increase, improve disposal ability.
3, on the weir plate of the present utility model perforate can be arranged, perforate can slow down the trend that forms eddy current on the inlet weir, reduce the inlet resistance, reduce liquid level drop, the column plate inlet can reduce liquid layer thickness on the plate, reduces column plate pressure and falls, its leakage rate can reduce 10～15%, perforate simultaneously helps liquid flow, can reduce liquid layer thickness on the plate, reduces column plate pressure and falls;
4, perforate on exit weir can reduce gas holdup in the downspout, improves operational stability, and the downspout disposal ability can increase about 10～20%; Traditional weir is difficult to reach the even requirement that reaches design flexibility of liquid distribution, and the utility model can well address this problem; When liquid was crossed exit weir, a part of liquid can partly reduce the overflow intensity on exit weir top from the perforate earial drainage, froth bed in the downspout is formed impact, and quickened the separation of gas-liquid in the downspout; Utilize the effect of viscous force, quicken flowing of arcuate region liquid, partial offset liquid forms the kinetic energy of stagnant area; Increase in the downspout utilization of space etc.
5, on the outlet weir plate, gas-guiding structure is set, make that isolated gas phase is easy to derive in the downspout from gas-guiding structure, increase the downspout utilization of space, reduce gas holdup in the downspout, eliminate the pressure oscillation of downspout operation, improve operational stability and downspout disposal ability.
6, simple in structure, easy for installation, operating characteristics is reliable.
Fig. 1 is the utility model mounting structure schematic diagram;
Fig. 2 is trapezoidal structural representation for the utility model weir plate 101 tops;
Fig. 3 is arc structural representation for the utility model weir plate 101 tops;
Fig. 4 is that the utility model weir plate 101 is the structural representation of cambered plate;
Fig. 5 is that the utility model weir plate 101 is the structural representation of trapezoidal plate;
Fig. 6 is the flow stream velocity field schematic diagram on the utility model column plate;
Fig. 7 is the structural representation of the utility model weir plate 101 band gas-guiding structures 103.
Below in conjunction with accompanying drawing the utility model is further described:
In plate column 2, there are two bursts of logistics of liquid and vapor capacity, gas phase and liquid phase stream are to be counter-current flow from total flow direction, specifically mobile on every block of column plate 3 is to be cross-flow passes, be that liquid stream is fallen from downspout 4, enter column plate 3, on column plate 3, inlet weir 1 is crossed in overflow before this, enters column plate 3 bubbling areas, carries out contact mass transfer with the gas phase that rises by the bubbling element for 3 times from column plate, exit weir 1 is crossed in overflow then, enter lower floor's downspout 4, the logistics of vapour-liquid phase through step by step tray contact mass transfer repeatedly, finally reaches desired separating effect in tower 2.
Exit weir 1 is arranged on the position (see figure 1) that column plate 3 liquid flow exports link to each other with downspout 4, purpose is in order to guarantee certain thickness liquid layer to be arranged on the column plate 3, liquid phase mobile on the vapour phase that rises by column plate 3 and the column plate 3 is fully contacted, downflow weir 1 is high more, liquid layer is thick more, and vapour-liquid is long more time of contact, and mass-transfer efficiency is also high more, but gas phase is also big more by the resistance that column plate 3 need overcome, and the pressure of column plate 3 falls also big more.Inlet weir 1 is arranged on (see figure 2) on the column plate 3 liquid inflow entrance positions, and it plays distribution and buffering effect to the liquid that enters column plate, and the liquid that downspout is flowed down is evenly distributed on the column plate 3 and weakens the percussion of upper strata column plate 3 dirty liquid; In addition, inlet weir 1 has the effect of liquid sealing, and downspout 4 lower edges are lower than inlet weir 1 upper limb, can prevent that gas phase is from the downspout short circuit.In the ordinary course of things, when adopting chord downcomer 4, the lower edge of downspout 4 itself can play certain distribution effect, thus Chang Bushe inlet weir, but general column plate 3 all is provided with exit weir.In practical engineering design, the size on weir 1 and type all have certain designing requirement.
The upper limb shape of weir plate 101 can be arc, trapezoidal or other any middle high, low non-straight structure in two ends.Compare with conventional weir, when liquid flows through inlet weir 1, can adjust flow distribution, weir 1 two ends flow is bigger, successively decreases to the centre gradually, and the liquid measure that promptly flows to column plate 3 both sides arch area increases relatively, makes the situation of liquid holdup and back-mixing be eased.
Weir plate 101 itself can be straight plate, also can be arc, trapezoidal or other non-straight plate structure.Because liquid is bigger by the kinetic energy that downspout 4 flows down when entering column plate 3, according to inertia, it has the trend of crossing column plate 3 along linear flow, when weir plate 101 adopts non-straight plate structure, can change liquid flow direction, make and flow radially when liquid enters column plate 3 that the liquid distribution on the column plate 3 significantly improves, the stagnant area area reduces, and column plate 3 efficient improve.
Use traditional exit weir 3, be difficult to reach the requirement of design flexibility, the utility model then can solve this class problem preferably, under same downspout 4 chord lengths, weir of the present utility model is longer, can effectively reduce overflow intensity, improves disposal ability, simultaneously, weir plate 1 upper limb of the present utility model can be smooth limit, also can be profile of tooth, when weir plate 101 upper limbs adopt serrated edge, also can normal running under low liquid measure, so can increase the operating flexibility scope.
On the weir plate 101 perforate 102 can be arranged, also can not have perforate 102.On weir plate 101, gas-guiding structure 103 can be set, also can not establish gas-guiding structure 103.When on the inlet weir 1 perforate 102 being arranged, can slow down the trend that forms eddy current, reduce the inlet resistance, reduce liquid level drop, reduce column plate 3 inlet leakage rates, perforate simultaneously helps liquid flow, can reduce liquid layer thickness on the plate, reduces column plate 3 pressure and falls; On exit weir, establish perforate 102, when liquid is crossed exit weir 1, part liquid unloads stream from perforate 102, can alleviate the trend that forms eddy current, gas is difficult for passing through from perforate 102, and the bubble of carrying secretly in the liquid is reduced, and adds some bubble and can derive from gas-guiding structure 103, so gas holdup reduces in the downspout 4, operational stability and downspout disposal ability improve.
Claims (4)
- One class high-performance go into, exit weir, column plate (3) is arranged in plate column (2), column plate (3) links to each other with downspout (4), outlet and downspout (4) connecting place at column plate (3) are provided with exit weir (1), be provided with inlet weir (1) in column plate (3) porch, it is characterized in that: weir (1) is made up of weir plate (101), perforate (102), gas-guiding structure (103), perforate (102) is arranged on weir plate (101) and be provided with gas-guiding structure (103).
- 2. a class high-performance according to claim 1 is gone into, exit weir, it is characterized in that: the upper limb shape of weir plate (101) can be arc, trapezoidal or other any middle high, low curve in two ends.
- 3. a class high-performance according to claim 1 is gone into, exit weir, it is characterized in that: the shape of weir plate (101) can be straight plate, also can be arc, trapezoidal or other curved surface.
- 4. a class high-performance according to claim 2 is gone into, exit weir, it is characterized in that: the upper limb shape of weir plate (101) can be smooth limit, also can be profile of tooth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00233539 CN2441535Y (en) | 2000-06-02 | 2000-06-02 | High performance inlet and outlet weir |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00233539 CN2441535Y (en) | 2000-06-02 | 2000-06-02 | High performance inlet and outlet weir |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2441535Y true CN2441535Y (en) | 2001-08-08 |
Family
ID=33595865
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00233539 Expired - Lifetime CN2441535Y (en) | 2000-06-02 | 2000-06-02 | High performance inlet and outlet weir |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2441535Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101955271A (en) * | 2010-09-25 | 2011-01-26 | 中国石油大学(北京) | Multistage tower-type flotation device for treating oily sewage |
| 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 |
| CN103752252A (en) * | 2013-12-18 | 2014-04-30 | 江苏华杉环保科技有限公司 | S-shaped high efficiency oriented composite sieve tray |
| CN105582694A (en) * | 2015-12-22 | 2016-05-18 | 中国石油大学(华东) | Device and method of integrating liquid desulfurization and degassing |
-
2000
- 2000-06-02 CN CN 00233539 patent/CN2441535Y/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101955271A (en) * | 2010-09-25 | 2011-01-26 | 中国石油大学(北京) | Multistage tower-type flotation device for treating oily sewage |
| CN101955271B (en) * | 2010-09-25 | 2012-03-14 | 中国石油大学(北京) | Multistage tower-type flotation device for treating oily sewage |
| 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 |
| CN103752252A (en) * | 2013-12-18 | 2014-04-30 | 江苏华杉环保科技有限公司 | S-shaped high efficiency oriented composite sieve tray |
| CN105582694A (en) * | 2015-12-22 | 2016-05-18 | 中国石油大学(华东) | Device and method of integrating liquid desulfurization and degassing |
| CN105582694B (en) * | 2015-12-22 | 2018-03-23 | 中国石油大学(华东) | A kind of device and method of liquid desulfurization degassing integration |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Granted publication date: 20010808 |