CN105771873A - Efficient mass transfer structured packing - Google Patents
Efficient mass transfer structured packing Download PDFInfo
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- CN105771873A CN105771873A CN201610192044.8A CN201610192044A CN105771873A CN 105771873 A CN105771873 A CN 105771873A CN 201610192044 A CN201610192044 A CN 201610192044A CN 105771873 A CN105771873 A CN 105771873A
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- packing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/32—Packing elements in the form of grids or built-up elements for forming a unit or module inside the apparatus for mass or heat transfer
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- Thermal Sciences (AREA)
- Organic Chemistry (AREA)
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- Physical Or Chemical Processes And Apparatus (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The invention relates to efficient mass transfer structured packing. The efficient mass transfer structured packing is formed by alternatively arranging structured packing sheet unit groups A and B which are of different heights, wherein the upper end and the lower end of each unit group A protrude to a height h higher than those of the unit groups B, and the protrusions are wrapped by wire meshes; the unit groups A and B are formed by the same structured packing sheets, namely orifice corrugated packing, rolled pore plate corrugated packing, gauze packing winpak, window-opening diversion packing or picercing hole mellapale. According to the efficient mass transfer structured packing, gas and liquid phases perform falling film contact mass transfer on the surface of the packing, and form a bubbling mass transfer mode at the joint of a packing box, and therefore the efficiency of gas-liquid mass transfer is greatly increased. According to the efficient mass transfer structured packing, two modes of gas-liquid mass transfer are achieved in a plate tower and a packed tower, the defective condition of low mass transfer efficiency of the packed tower under high-pressure operation is effectively relieved, and the packing is of great significance in many industrialized productions including large-scale distillation and absorption.
Description
Technical field
The present invention relates to a kind of novel structured packing with relatively high mass transfer efficiency, it has filling surface falling liquid film contact mass transfer and the common feature of column plate bubbling gas-liquid mass transfer, considerably increases gas-liquid mass transfer efficiency.
Background technology
Structured packing plays very important effect as the critical piece of the gas-to-liquid contact in packed tower.In the last few years, along with development and the energy-conservation needs of petrochemical industry, the exploitation of structured packing and application obtain fast development, and the change that breaks through of the chemical field such as distillation and absorption also promotes the research and development of high flux structured packing to gain great popularity.But in high-pressure rectification occasion, owing to condition of high voltage is relatively larger on the dynamic impact of operation system and gas-liquid distributed flow, causing that gas liquid interfacial area declines, mass transfer force reduces, and finally makes the mass-transfer efficiency of structured packing reduce.Separating thus for high-pressure rectification, such as propane-propylene separates, and is generally adopted plate column in industry.Owing to the relative volatility of propane and propylene is less, the method adopting industrial conventional distil-lation, the tower height of design reaches 90 meters, the number of plates is more than 200 pieces, reflux ratio, more than 10, also to be pressurizeed, the technological process such as refrigeration, which results in operating cost and cost of equipment is greatly increased.In recent years, along with the increase that low-carbon (LC) hydro carbons separating substances is required, demand for high pressure equipment is also increasing, and its advantage has been given play in the highly desirable structured packing of people in high-pressure rectification field, thus develop a kind of under high pressure operating mode the structured packing of efficient mass transfer seem particularly significant.
In the last few years, people did not go out for the research layer improving the mass-transfer efficiency of structured packing thoroughly.CN202823396U proposes by the special handling of structured packing surface so that it is be covered with continuous print ripplet, which increase specific surface area and the roughness of filler, thus improving the mass-transfer efficiency of filler.Utilizing in CN101549278A that Foamed Nickel web material matter is treated is processed into ductility corrugated plating, the structured packing being so made has bigger specific surface area, thus having higher gas-liquid mass transfer efficiency.CN203620643U proposes a kind of S type ripple packing, this filler unit is that the rule respectively of two ends up and down of structured packing body is arranged craspedodrome ripple, by oblique ripple UNICOM between craspedodrome ripple, this S type ripple packing arranged by rule increases mass transfer specific surface area, optimize gas-liquid stream, thus show good mass-transfer performance.CN101380562A proposes crest and trough at corrugated filler tablet and offers water conservancy diversion window, so that the liquid film flowed downward along trough changes, effectively promote renewal and the turbulence of filling surface liquid film, improve gas-liquid mass transfer speed.
Most of patented inventions are just for changing packing sheet surface texture, its specific surface area or roughness is made to become big, but under high-pressure rectification operating mode, there is very big change in gas-liquid system physical property, may result in that filling surface is long-pending to be not fully utilized, thus this method can't be fully solved the production application of filler when high-pressure rectification.
Summary of the invention
The present invention proposes a kind of novel structured packing with relatively high mass transfer efficiency, and this filler possesses column plate bubble type gas-liquid mass transfer and the common feature of filling surface falling liquid film contact mass transfer, largely adds gas-liquid mass transfer efficiency.
The present invention is achieved in that
The structured packing of a kind of efficient mass transfer, by highly different structured packing blade unit group A, B is alternately arranged forms；Unit group A upper/lower terminal all ratio unit group B protrusion height h, and projection metal gauze wraps up；Unit group A, B adopt identical structured packing sheet.
The structure that described unit group A, B adopts identical structured packing sheet to be perforated plate corrugated, calendering Lamb wave stricture of vagina, screen waviness, window diversion or acanthopore ripple.
Described is that in unit group A, B, structured packing sheet quantity is preferably 2.
The height h of described unit group A upper and lower two ends projection is preferably 10～30mm.
The metal gauze of described parcel form tuple A preferably employs 10～20 orders.
The application in tower of the filler of the present invention, according to concrete equipment internal diameter, when tower diameter is less, is processed into the square of calibrated altitude or circular discs by structured packing；When tower diameter is bigger, filler piecemeal is installed, and liquid phase is redistributed by installation redistributor between packing layer.
When the packed tower multiple packing box of internal placement, between neighbouring two dish fillers, the anglec of rotation is 90 °.
The invention have the advantage that owing to metal gauze encloses the two ends up and down of unit of structured packing group A, when liquid phase fluid enters whole packing box upper end, effect due to surface tension of liquid, one layer of liquid film can be formed on a wire mesh, block the gas phase inflow in unit group A lower end, so make gas phase can only flow into from unit group B lower end, gas phase actual internal area reduces only about half of, this makes gas phase flow velocity in packing box intersection abruptly increase, cause that local liquid flooding occurs interface portion, so that liquid phase forms certain liquid level at packing box intersection.When gas phase enters dish filler from lower wall filler, just defining the state of a kind of bubbling, the interface between such packing box is equivalent to one layer of column plate.Structured packing in the present invention not only makes gas-liquid two-phase carry out falling liquid film contact mass transfer at filling surface, and forms bubble type mass transfer mode at packing box intersection, thus greatly strengthen gas-liquid mass transfer efficiency.In the present invention, structured packing achieves two kinds of gas-liquid mass transfer modes in plate column and packed tower, effectively improve the undesirable condition that when operation with high pressure, packed tower mass-transfer efficiency reduces, significant for a lot of large-scale industrialized production such as rectification, absorption.
Accompanying drawing explanation
Fig. 1 is the schematic perspective view of invention filler.
Fig. 2 is the top view of invention filler.
Fig. 3 is the front view of invention filler.
Fig. 4 is the internal gas phase flow schematic diagram of invention filler.
Fig. 5 is liquid flooding district, adjacent packing box intersection local.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is described in further detail:
As illustrated in fig. 1 and 2, a kind of structured packing with higher gas-liquid mass transfer efficiency, by the structured packing blade unit group A of two kinds of differing heights, B is alternately arranged forms.Unit group A protrudes h than unit group B upper/lower terminal, and the part metal gauze of protrusion wraps up.Structured packing sheet can be the regular packing sheets such as perforated plate corrugated filler sheet, window diversion packing sheet, protruded corrugated sheet packing sheet, acanthopore corrugated filler tablet, wire mesh packing sheet.In unit group A, B, the quantity of packing sheet is all 2.
The height of unit group A upper and lower end metal gauze wrapping portion is h, and wherein h can be 10mm～30mm.
Little tower diameter is produced, sets structured packing dish according to tower diameter high；For bigger tower diameter, it is possible to adopt piecemeal to install and the method for dismounting.
As it is shown on figure 3, when placing multiple packing box in tower, neighbouring packing box lays angle half-twist, if packing layer is higher, every one section of height packing layer, redistributor to be installed and carry out liquid redistribution.
The general structured packing of filler pressure drop ratio of the present invention is big, but gas-liquid mass transfer efficiency is greatly enhanced, more practical particularly with the operating condition such as high-pressure rectification, absorption.
As shown in Figures 4 and 5 owing to liquid has surface tension, liquid film can be formed after liquid flows through metal gauze on silk screen surface, hinder gas phase to flow into from filler unit group A lower end.So making structured packing dish interface place gas phase flow channel be greatly reduced, its local gas speed increases, and causes the generation of local liquid flooding.When gas phase flows through liquid flooding region, local, in bubbling mode through this region, thus enhancing mass transfer effect between gas-liquid.Gas phase continues after flowing through liquid flooding region, local and the liquid film of structured packing Surface runoff carries out contact mass transfer.Structured packing of the present invention achieves plate column and two kinds of gas-liquid mass transfer modes of packed tower, greatly strengthen mass-transfer efficiency.
Embodiment 1:
Employing tower diameter is DN400, and highly structured packing of the present invention and general window diversion structured packing are carried out hydrodynamic performance test by cold model unit for 5m respectively.Tower top is equipped with liquid distribution trough and liquid phase is carried out initial distribution.Inner-tower filling material layer is altogether equipped with 6 dish structured packings, packing layer total height 1320mm.In structured packing dish, unit group A is highly 220mm, and unit group B height is 200mm.Wherein the height h of unit group A upper/lower terminal projection is 10mm, and wraps up with the metal gauze of 20 orders.Packing sheet adopts 500X window diversion packing sheet.Experimentation adopts sprinkle density to range for 0～90m3/m2H, gas phase F-factor ranges for 0～3.0Pa0.5.It is shown that compare common structured packing, packing pressure drop of the present invention exceeds about 15～40% than general window diversion filler, and liquid holdup exceeds 20%～50%.Due to the generation of local Concerning Flooding Phenomenon between neighbouring packing box, cause the rising of gas phase flow resistance, so that pressure drop and liquid holdup increase.
Embodiment: 2:
Propane-propylene is carried out rectification separation by the packed tower of application pilot-scale under elevated pressure conditions, tests structured packing mass-transfer performance of the present invention.Packed tower diameter is DN600, and inner-tower filling material layer is 10 dish structured packings, is divided into two sections, installs liquid re-distributor at packing layer mid portion.Structured packing sheet of the present invention adopts 250X profiled orifice plate corrugated filler tablet.In structured packing dish, unit group A is highly 250mm, and the height of unit group B is 220mm.Unit group A upper and lower side projecting portion height h is 15mm, and wraps up with 12 order metal gauzes.Liquid phase sprinkle density scope adopts 10～80m3/m2H, empty tower gas velocity ranges for 0.1～2.5m/s.Data calculate the height of transfer unit of filler of the present invention and the theoretical cam curve of unit height packing layer by experiment.Fact proved, the structured packing of the present invention of every meter of height is equivalent to 5～6 grades of number of theoretical plates, compares with Conventional plate-type tower, substantially reduces rectifying column height, saves fixed investment expense.
Embodiment 3:
Repack rustless steel tower section in the middle of the chill tower of DN400 transparent with machine glass tower section into, tower is observed built with structured filling material layer in the same manner as in Example 1.In experimentation, it has been found that more violent in neighbouring packing box juncture area liquid phase turbulent flow, and having the liquid of certain liquid level to accumulate in silk screen layer, gas is distributed to this region with the form of bubble.This observation experiment further shows that the existence in liquid flooding district, local.
Claims (7)
1. a structured packing for efficient mass transfer, by highly different structured packing blade unit group A, B is alternately arranged forms；It is characterized in that: unit group A upper/lower terminal all ratio unit group B protrusion height h, and projection metal gauze wraps up；Unit group A, B adopt identical structured packing sheet.
2. filler as claimed in claim 1, is characterized in that the structure that unit group A, B adopt identical structured packing sheet to be perforated plate corrugated, calendering Lamb wave stricture of vagina, screen waviness, window diversion or acanthopore ripple.
3. filler as claimed in claim 1, is characterized in that in unit group A, B, structured packing sheet quantity is 2.
4. filler as claimed in claim 1, is characterized in that the height h of unit group A upper and lower two ends projection is 10～30mm.
5. filler as claimed in claim 1, is characterized in that the metal gauze of parcel form tuple A adopts 10～20 orders.
6. the filler of claim 1 application in tower, is characterized in that, according to concrete equipment internal diameter, when tower diameter is less, structured packing being processed into the square of calibrated altitude or circular discs；When tower diameter is bigger, filler piecemeal is installed, and liquid phase is redistributed by installation redistributor between packing layer.
7. apply as claimed in claim 6, it is characterized in that between neighbouring two dish fillers, the anglec of rotation is 90 ° when the packed tower multiple packing box of internal placement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610192044.8A CN105771873B (en) | 2016-03-30 | 2016-03-30 | A kind of structured packing of efficient mass transfer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610192044.8A CN105771873B (en) | 2016-03-30 | 2016-03-30 | A kind of structured packing of efficient mass transfer |
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| CN105771873A true CN105771873A (en) | 2016-07-20 |
| CN105771873B CN105771873B (en) | 2018-10-23 |
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| CN201610192044.8A Active CN105771873B (en) | 2016-03-30 | 2016-03-30 | A kind of structured packing of efficient mass transfer |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109569198A (en) * | 2017-09-28 | 2019-04-05 | 霓佳斯株式会社 | Gas liquid contact body |
| CN110038395A (en) * | 2019-04-10 | 2019-07-23 | 互邦达科技（北京）有限公司 | A kind of regular wire packing, manufacturing process and high-gravity rotating bed |
| WO2020212460A1 (en) | 2019-04-16 | 2020-10-22 | L'air Liquide Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Cross-corrugated packing made from metal foam |
| CN113167556A (en) * | 2018-09-25 | 2021-07-23 | 布伦特伍德工业公司 | Cross-corrugated media and related methods |
Citations (4)
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| US5632934A (en) * | 1994-10-04 | 1997-05-27 | Praxair Technology, Inc. | Packing with improved capacity for rectification systems |
| US5921109A (en) * | 1998-10-21 | 1999-07-13 | Praxair Technology, Inc. | Method for operating a cryogenic rectification column |
| CN1935354A (en) * | 2006-09-19 | 2007-03-28 | 杭州杭氧股份有限公司 | Plate corrugated regular packed tower |
| CN103721666A (en) * | 2013-12-13 | 2014-04-16 | 天津大学 | Catalytic distillation filler with low pressure drop |
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2016
- 2016-03-30 CN CN201610192044.8A patent/CN105771873B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5632934A (en) * | 1994-10-04 | 1997-05-27 | Praxair Technology, Inc. | Packing with improved capacity for rectification systems |
| US5921109A (en) * | 1998-10-21 | 1999-07-13 | Praxair Technology, Inc. | Method for operating a cryogenic rectification column |
| CN1935354A (en) * | 2006-09-19 | 2007-03-28 | 杭州杭氧股份有限公司 | Plate corrugated regular packed tower |
| CN103721666A (en) * | 2013-12-13 | 2014-04-16 | 天津大学 | Catalytic distillation filler with low pressure drop |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109569198A (en) * | 2017-09-28 | 2019-04-05 | 霓佳斯株式会社 | Gas liquid contact body |
| CN113167556A (en) * | 2018-09-25 | 2021-07-23 | 布伦特伍德工业公司 | Cross-corrugated media and related methods |
| CN110038395A (en) * | 2019-04-10 | 2019-07-23 | 互邦达科技（北京）有限公司 | A kind of regular wire packing, manufacturing process and high-gravity rotating bed |
| WO2020212460A1 (en) | 2019-04-16 | 2020-10-22 | L'air Liquide Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Cross-corrugated packing made from metal foam |
| FR3095129A1 (en) * | 2019-04-16 | 2020-10-23 | L'Air Liquide, Société Anonyme pour l'Etude et l'Exploitation des Procédés Georges Claude | Corrugated-crossed metal foam filling |
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| Publication number | Publication date |
|---|---|
| CN105771873B (en) | 2018-10-23 |
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Address after: 210046 Wen Lan Road, Qixia District, Nanjing, Jiangsu Province, No. 6 Co-patentee after: Tianjin University Patentee after: China Construction Installation Group Co., Ltd. Address before: 210000 New Village of Yaohua Menyao'an, Qixia District, Nanjing City, Jiangsu Province Co-patentee before: Tianjin University Patentee before: China Construction Industrial Equipment Installation Co., Ltd. |