CN111389041A - Magnetic field enhanced liquid oxygen heat and mass transfer device and packed tower adopting same - Google Patents
Magnetic field enhanced liquid oxygen heat and mass transfer device and packed tower adopting same Download PDFInfo
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- CN111389041A CN111389041A CN202010349817.5A CN202010349817A CN111389041A CN 111389041 A CN111389041 A CN 111389041A CN 202010349817 A CN202010349817 A CN 202010349817A CN 111389041 A CN111389041 A CN 111389041A
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- magnetic field
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- mass transfer
- transfer device
- oxygen heat
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- 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
- B01D3/22—Fractionating columns in which vapour bubbles through liquid with horizontal sieve plates or grids; Construction of sieve plates or grids
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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
Abstract
The invention relates to a magnetic field enhanced liquid oxygen heat and mass transfer device and a packed tower adopting the same, belonging to the field of low-temperature rectification air separation. The method comprises the following steps: the magnetic field generator comprises a cylindrical support, a plurality of annular sieve plates which are arranged at intervals up and down, and a magnetic field generator arranged in the center of the support; the magnetic field generator is cylindrical, the outer edge of the sieve plate is fixed on the inner wall of the supporting piece, and the inner edge of the sieve plate is fixed with the magnetic field generator; the sieve plates are provided with sieve pores for ascending gas to pass through and liquid descending pores for descending liquid to pass through, and the liquid descending pores of two adjacent sieve plates are arranged in a staggered manner. The alternating magnetic field is applied to apply magnetic field force and magnetic moment to the oxygen component in the ascending gas and descending liquid mixture, so that the oxygen component and the ascending gas and the descending liquid mixture are applied with additional stirring effect, the heat transfer and mass transfer between the oxygen component and the ascending gas and the descending liquid mixture are enhanced, and the problem of uneven concentration and temperature of the ascending gas and the descending liquid mixture is solved.
Description
Technical Field
The invention relates to the field of low-temperature rectification air separation, in particular to a magnetic field enhanced liquid oxygen heat and mass transfer device and a packed tower adopting the device.
Background
The industrial gas is 'blood' of modern industry, the low-temperature rectification is the most effective and economic method for preparing industrial gas products such as high-purity oxygen, nitrogen and the like on a large scale at present, has the advantages of mature technology, high product purity, high yield and the like, and can directly obtain liquid products. The purpose of gas separation is achieved by utilizing the boiling point difference of working media through continuous and repeated partial evaporation and partial condensation processes.
The low-temperature rectification equipment has a high proportion in equipment investment and operation cost in industries such as steel, petrifaction and the like, and has important significance for the research of strengthening and energy saving. In recent decades, the structured packing tower has been widely used in cryogenic air separation due to its advantages of lower pressure drop, higher efficiency, higher capacity, etc., and can significantly reduce the volume of the rectifying tower and the energy consumption of the air separation unit. In order to fully exert the excellent performance of the regular packing, various appropriate tower internals must be arranged in the packed tower. The problem of the amplification effect of the increase of the tower diameter of the packed tower is solved by ensuring the uniform distribution of liquid and the full contact of gas and liquid.
Research and practice show that when the packing exceeds a certain height, local liquid-gas ratio generates deviation in the radial direction due to factors such as channeling, wall flow and the like, and the cross section of the tower has nonuniform liquid flow, concentration and temperature. The placement of a liquid redistributor at a certain height from the packing inlet can significantly alleviate this problem.
However, when the liquid flows into the redistributor, the phenomenon of uneven concentration and temperature of the liquid in the filler layer still exists due to the reason that the mixing time is short or no external force is used for assisting stirring and the like. Therefore, it is desirable to find a method for enhancing the heat and mass transfer between descending liquid and ascending gas in the packing layer during the cryogenic rectification process to improve the deterioration of the packing performance.
Disclosure of Invention
The invention aims to provide a magnetic field enhanced liquid-oxygen heat and mass transfer device and a packed tower adopting the same, which can solve the problems of uneven concentration and temperature of mixture of rising gas and falling liquid.
In order to achieve the above object, in a first aspect, the present invention provides an apparatus for enhancing liquid-oxygen heat and mass transfer by magnetic field, comprising: the magnetic field generator comprises a cylindrical support, a plurality of annular sieve plates which are arranged at intervals up and down, and a magnetic field generator arranged in the center of the support; the magnetic field generator is cylindrical, the outer edge of the sieve plate is fixed on the inner wall of the support piece, and the inner edge of the sieve plate is fixed with the magnetic field generator;
the sieve plates are provided with sieve pores for ascending gas to pass through and liquid descending pores for descending liquid to pass through, and the liquid descending pores of two adjacent sieve plates are arranged in a staggered manner.
In the technical scheme, the alternating magnetic field is added to apply magnetic field force and magnetic moment to oxygen components in the ascending gas and descending liquid mixture, so that the oxygen components are additionally stirred, the heat transfer and mass transfer between the oxygen components and the ascending gas and the descending liquid mixture are enhanced, and the problem of uneven concentration and temperature of the ascending gas and the descending liquid mixture is solved.
Optionally, in one embodiment, the edge of the downcomer hole is provided with a liquid baffle.
Optionally, in one embodiment, the liquid dropping hole is formed by cutting a knife at the outer edge of the screen plate, and the liquid baffle plate is arranged on the knife trace.
Optionally, in one embodiment, the magnetic field generator comprises a housing fixed to an inner edge of the screen plate, and a metal core and a conductive coil disposed in the housing. An alternating magnetic field can be generated in the filler layer by introducing alternating current into the conductive coil, and the conductive coil and the metal inner core in the magnetic field generator can be replaced by a permanent magnet with high magnetic field strength, so that a similar effect is achieved. The oxygen component in the mixture in the filler layer can be subjected to unidirectional magnetic field force, and for descending liquid, the thickness of a liquid film on the surface of the filler can be reduced, so that the heat and mass transfer of the descending liquid and ascending gas is facilitated.
Optionally, in an embodiment, a magnetic conductive medium filling region is disposed between the conductive coil and the housing, and the magnetic conductive medium filling region has a high magnetic conductivity medium therein.
Optionally, in one embodiment, the high permeability medium is stainless steel wool.
On the other hand, the packed tower provided by the invention is internally provided with the magnetic field enhanced liquid oxygen heat and mass transfer device, and the magnetic field enhanced liquid oxygen heat and mass transfer device is positioned at the bottom of the packing layer. Because the magnetic field gradient at the center of the bottom is the largest, the descending liquid can be subjected to the magnetic force in the direction of the central line of the bottom, the wall flow problem of the descending liquid can be improved, and the effect of uniformly distributing the incoming gas and liquid is achieved. When the ascending gas and the descending liquid are in the filler layer, the alternating magnetic field in the area applies magnetic field force and magnetic moment to the oxygen component in the mixture of the ascending gas and the descending liquid, so that the oxygen component is respectively promoted to move horizontally and rotate, the stirring and mixing effect of the mixture is macroscopically played, and the uniformity of the concentration and the temperature of the substances in the filler layer is accelerated.
Optionally, in an embodiment, a supporting grid plate for placing the magnetic field enhanced liquid oxygen heat and mass transfer device is further arranged in the packed tower.
Optionally, in one embodiment, the filler layers and the magnetic field enhanced liquid-oxygen heat and mass transfer device are alternately arranged in a layered combination.
Compared with the prior art, the invention has the advantages that:
in the invention, the ascending gas passes through the liquid through the sieve pores, and the descending liquid flows back and forth through the liquid descending pores. The descending liquid and ascending gas are subjected to cross countercurrent in the device and the action of a strong magnetic field generated by the intermediate magnetic field generator to strengthen heat and mass transfer, so that the magnetic field strengthening device does not excessively influence the performance of the original equipment due to space occupation. Is suitable for the low-temperature rectification air separation process in the packed tower.
Drawings
FIG. 1 is a schematic diagram of the arrangement of a magnetic field enhanced liquid oxygen heat and mass transfer device in a packed tower according to an embodiment of the invention;
FIG. 2 is a schematic structural diagram of a magnetic field enhanced liquid-oxygen heat and mass transfer device according to an embodiment of the present invention;
FIG. 3 is a cross-sectional view of a magnetic field enhanced liquid-oxygen heat and mass transfer device in accordance with an embodiment of the present invention;
FIG. 4 is a top view of a magnetic field enhanced liquid-oxygen heat and mass transfer device according to an embodiment of the present invention;
fig. 5 is a schematic structural view of a magnetic field generator according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described with reference to the following embodiments and accompanying drawings. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments without any inventive step, are within the scope of protection of the invention.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of the word "comprise" or "comprises", and the like, in the context of this application, is intended to mean that the elements or items listed before that word, in addition to those listed after that word, do not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
Examples
Referring to fig. 1, the magnetic field enhanced liquid oxygen heat and mass transfer device 100 of the present embodiment is disposed in a packed tower, in which a packing layer 200 and a support grid 300 are further disposed, and the magnetic field enhanced liquid oxygen heat and mass transfer device 100 is disposed between the packing layer 200 and the support grid 300. Wherein the filler layer 200 and the magnetic field enhanced liquid-oxygen heat and mass transfer device 100 can be alternately layered and combined.
The magnetic field enhanced liquid oxygen heat and mass transfer device 100 comprises: support piece 101, a plurality of sieve plates 102 and magnetic field generator 103, support piece 101 is cylindric, sieve plate 102 is annular, magnetic field generator 103 is cylindric, and the outer fringe of sieve plate 102 is fixed on support piece 101's inner wall, and magnetic field generator 103 is fixed to the inner fringe. Sieve plate 102 is provided with sieve holes 1021 for passing ascending gas and downcomer holes 1022 for passing descending liquid, and downcomer holes 1022 of two adjacent sieve plates 102 are arranged in a staggered manner. The downcomer holes 1022 in this embodiment are formed by cutting a knife at the outer edge of the screen deck 102, and a liquid baffle 1023 is provided on the knife track.
The supporting piece 101 plays a role in protection and fixation, so that the whole magnetic field enhanced liquid-oxygen heat and mass transfer device 100 can be stably placed between the filler layer 200 and the supporting grid plate 300, and the middle magnetic field generator 103 and the multi-layer sieve plate 102 are fixed. The housing 1031 serves to protect the internal conductive coil 1033, the metal core 1032, and the magnetically permeable media fill area 1034. The conductive coil 1033, the metal core 1032 and the magnetically permeable medium filled region 1034 containing a high magnetic permeability magnetically permeable medium can generate an alternating magnetic field, apply a magnetic field force and a magnetic moment to the oxygen component in the ascending gas and descending liquid mixture in the packing layer 200, play an additional role of stirring, and strengthen the heat and mass transfer between the ascending gas and descending liquid mixture, thereby improving the problem of uneven concentration and temperature of the ascending gas and descending liquid mixture in the packing layer 200.
The positions of the downcomer holes 1022 in adjacent decks 102 are all opposite as shown in fig. 4, and the screen holes 1021 in the upper and lower decks 102 are also staggered. The rising gas passes through the liquid through the mesh 1021, while the falling liquid flows back and forth through the downcomer holes 1022. Liquid baffle 1023 ensures that sufficient interphase heat and mass transfer surface is formed on screen deck 102. The descending liquid and the ascending gas generate cross counter flow in the magnetic field enhanced liquid-oxygen heat and mass transfer device 100, and the heat and mass transfer between gas and liquid is enhanced under the action of the strong magnetic field generated by the intermediate magnetic field generator 103, so that the performance of the original equipment cannot be excessively influenced by the occupied space of the magnetic field enhanced liquid-oxygen heat and mass transfer device 100.
The magnetic field enhanced liquid-oxygen heat and mass transfer device 100 can be positioned at the bottom of the packing layer 200, the magnetic field generator 103 is arranged at the center, so that the magnetic field gradient at the center of the magnetic field enhanced liquid-oxygen heat and mass transfer device 100 is the largest, descending liquid can be subjected to magnetic force in the direction of a central line, the wall flow problem of the descending liquid can be improved, and the effect of uniformly distributing gas and liquid flowing in is achieved.
Electrically conductive coil 1033 is helically wound around metal core 1032 and an alternating magnetic field is generated in packing layer 200 by introducing an alternating current into electrically conductive coil 1033. After the current is introduced, the wire coil 1033 generates a magnetic field in the magnetic conductive medium filling area 1034, and the magnetic field generated by the coil through the excitation of the current improves the magnetic field gradient around the device under the influence of the magnetic gathering effect of the magnetic conductive medium, improves the magnetic field force applied by the magnetic field to the oxygen component in the mixture, and strengthens the heat and mass transfer between the gas-liquid mixture.
The conductive coil 1033 and metal core 1032 in the magnetic field generator 103 may be replaced with a permanent magnet of high magnetic field strength to achieve a similar effect. The oxygen component in the mixture in the filler layer 200 is subjected to unidirectional magnetic field force, and for descending liquid, the thickness of a liquid film on the surface of the filler is reduced, so that the heat and mass transfer of the descending liquid and ascending gas is facilitated.
In a packed column, the magnetic field enhanced liquid oxygen heat and mass transfer device 100 can also act on processes related to the separation and liquefaction of oxygen in the same way, and apply magnetic force to oxygen components in a mixture through a magnetic field to enhance heat and mass transfer between low-temperature fluids.
Claims (9)
1. A magnetic field enhanced liquid oxygen heat and mass transfer device is characterized by comprising: the magnetic field generator comprises a cylindrical support, a plurality of annular sieve plates which are arranged at intervals up and down, and a magnetic field generator arranged in the center of the support; the magnetic field generator is cylindrical, the outer edge of the sieve plate is fixed on the inner wall of the support piece, and the inner edge of the sieve plate is fixed with the magnetic field generator;
the sieve plates are provided with sieve pores for ascending gas to pass through and liquid descending pores for descending liquid to pass through, and the liquid descending pores of two adjacent sieve plates are arranged in a staggered manner.
2. The magnetic field enhanced liquid-oxygen heat and mass transfer device according to claim 1, wherein the edge of the down-flow hole is provided with a liquid baffle.
3. The magnetic field enhanced liquid-oxygen heat and mass transfer device according to claim 2, wherein the down-flow holes are formed by cutting a knife on the outer edge of the sieve plate, and the liquid baffle is arranged on the trace of the knife.
4. The magnetic field enhanced liquid-oxygen heat and mass transfer device of claim 1, wherein the magnetic field generator comprises a housing fixed to the inner edge of the screen plate, and a metal core and a conductive coil disposed inside the housing.
5. The magnetic field enhanced liquid-oxygen heat and mass transfer device of claim 4, wherein a magnetically conductive medium filled region is disposed between the conductive coil and the housing, and the magnetically conductive medium filled region has a medium with high magnetic permeability.
6. The magnetic field enhanced liquid-oxygen heat and mass transfer device of claim 5, wherein said high permeability medium is stainless steel wool.
7. A packed tower, wherein a packing layer and the magnetic field enhanced liquid oxygen heat and mass transfer device as claimed in any one of claims 1 to 6 are arranged in the packed tower, and the magnetic field enhanced liquid oxygen heat and mass transfer device is positioned at the bottom of the packing layer.
8. The packed column according to claim 7, wherein a support grid is provided for placing the magnetic field enhanced liquid oxygen heat and mass transfer device.
9. The packed column according to claim 7, wherein the packing layers are disposed in alternating layered combination with the magnetic field enhanced liquid-oxygen heat and mass transfer device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010349817.5A CN111389041B (en) | 2020-04-28 | 2020-04-28 | Magnetic field enhanced liquid oxygen heat and mass transfer device and packed tower adopting same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010349817.5A CN111389041B (en) | 2020-04-28 | 2020-04-28 | Magnetic field enhanced liquid oxygen heat and mass transfer device and packed tower adopting same |
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| CN111389041A true CN111389041A (en) | 2020-07-10 |
| CN111389041B CN111389041B (en) | 2021-05-14 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114295517A (en) * | 2021-11-22 | 2022-04-08 | 浙江大学 | Visual experimental apparatus for low-temperature working medium falling film flowing mass transfer |
| CN117643734A (en) * | 2024-01-29 | 2024-03-05 | 伊川宏源气体科技有限公司 | Rectifying tower for concentrating krypton-xenon liquid in liquid oxygen and production method |
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| CN103884153A (en) * | 2014-03-24 | 2014-06-25 | 浙江大学 | Gradient magnetic field auxiliary low temperature fractionation air separation method and device |
| CN104096813A (en) * | 2013-04-12 | 2014-10-15 | 宝山钢铁股份有限公司 | Magnetic field generator and electromagnetic stirring device adopting magnetic field generator |
| CN108144419A (en) * | 2018-01-31 | 2018-06-12 | 宁夏大学 | Packed tower and its application method |
| CN209060581U (en) * | 2018-08-30 | 2019-07-05 | 新疆大森化工有限公司 | One kind can make the equally distributed rectifying column of liquid |
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| CN104096813A (en) * | 2013-04-12 | 2014-10-15 | 宝山钢铁股份有限公司 | Magnetic field generator and electromagnetic stirring device adopting magnetic field generator |
| CN203425810U (en) * | 2013-08-01 | 2014-02-12 | 昆明理工大学 | Tower type fixed bed-type gas-liquid reaction device |
| CN103884153A (en) * | 2014-03-24 | 2014-06-25 | 浙江大学 | Gradient magnetic field auxiliary low temperature fractionation air separation method and device |
| CN108144419A (en) * | 2018-01-31 | 2018-06-12 | 宁夏大学 | Packed tower and its application method |
| CN209060581U (en) * | 2018-08-30 | 2019-07-05 | 新疆大森化工有限公司 | One kind can make the equally distributed rectifying column of liquid |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114295517A (en) * | 2021-11-22 | 2022-04-08 | 浙江大学 | Visual experimental apparatus for low-temperature working medium falling film flowing mass transfer |
| CN117643734A (en) * | 2024-01-29 | 2024-03-05 | 伊川宏源气体科技有限公司 | Rectifying tower for concentrating krypton-xenon liquid in liquid oxygen and production method |
| CN117643734B (en) * | 2024-01-29 | 2024-04-09 | 伊川宏源气体科技有限公司 | Rectifying tower for concentrating krypton-xenon liquid in liquid oxygen and production method |
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| CN111389041B (en) | 2021-05-14 |
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