CN111729337B - Rotating magnetic field device for strengthening low-temperature rectification separation and rectification tower - Google Patents
Rotating magnetic field device for strengthening low-temperature rectification separation and rectification tower Download PDFInfo
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- CN111729337B CN111729337B CN202010437220.6A CN202010437220A CN111729337B CN 111729337 B CN111729337 B CN 111729337B CN 202010437220 A CN202010437220 A CN 202010437220A CN 111729337 B CN111729337 B CN 111729337B
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- 238000000926 separation method Methods 0.000 title claims abstract description 23
- 238000005728 strengthening Methods 0.000 title claims abstract description 8
- 238000012856 packing Methods 0.000 claims abstract description 42
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 36
- 239000007788 liquid Substances 0.000 claims abstract description 23
- 239000002184 metal Substances 0.000 claims abstract description 20
- 229910052751 metal Inorganic materials 0.000 claims abstract description 20
- 239000000945 filler Substances 0.000 claims abstract description 18
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000001301 oxygen Substances 0.000 claims abstract description 14
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 14
- 238000012546 transfer Methods 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 12
- 230000008569 process Effects 0.000 claims abstract description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 230000002265 prevention Effects 0.000 claims description 5
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 4
- OLBVUFHMDRJKTK-UHFFFAOYSA-N [N].[O] Chemical compound [N].[O] OLBVUFHMDRJKTK-UHFFFAOYSA-N 0.000 claims description 2
- 239000011552 falling film Substances 0.000 abstract description 3
- 238000004804 winding Methods 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 6
- 238000005265 energy consumption Methods 0.000 description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- 239000010408 film Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000002708 enhancing effect Effects 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 229910052786 argon Inorganic materials 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 230000016507 interphase Effects 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000005408 paramagnetism Effects 0.000 description 2
- 230000036961 partial effect Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- 238000009835 boiling Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 210000002105 tongue Anatomy 0.000 description 1
Images
Classifications
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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
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Separation By Low-Temperature Treatments (AREA)
Abstract
The invention relates to a rotating magnetic field device for strengthening low-temperature rectification separation and a rectification tower, belonging to the technical field of low-temperature rectification air separation. The method comprises the following steps: three groups of iron cores are uniformly arranged around the packing layer, and all the iron cores are wound with metal coils in the same direction; the metal coils are internally provided with sine alternating current, the current directions of the alternating current conducted by the two metal coils of the same iron core group are opposite, and the phase difference of the alternating current conducted by the adjacent iron core groups is 120 degrees. Three pairs of alternating current windings are arranged around the filler layer, so that a unidirectional rotating magnetic field is realized in the filler, rotating magnetic torque is applied to oxygen components in working media in the filler, and the gas-liquid countercurrent falling film mass transfer process on the surface of the filler is strengthened.
Description
Technical Field
The invention relates to the technical field of low-temperature rectification air separation, in particular to a rotating magnetic field device for strengthening low-temperature rectification separation and a rectification tower.
Background
China is the only country in the world currently having all the industrial categories in the united domestic industry classification, wherein industrial gas is an important basic material for supporting a plurality of industrial fields such as metallurgy, chemical industry, electronics, biology, medicine, food, aerospace and the like, and the production of industrial gas is one of the prop industries of the Chinese entity manufacturing industry. In 2017, the industrial gas market scale of China reaches 1200 hundred million yuan, and the annual composite growth rate reaches 10.16%. However, the unit energy consumption required by industrial gas production in China is still higher than the level of developed countries, and high energy consumption and high cost become problems to be solved urgently in the development of industrial gas industry.
At present, the low-temperature rectification method is most widely applied to large-scale preparation of high-purity oxygen, nitrogen and argon products, and has the advantages of mature technology, high product purity, high yield and the like. The principle of preparing industrial gas by low-temperature rectification is that interphase heat and mass transfer is carried out by utilizing the difference of boiling points of working media, and continuous and repeated partial evaporation and partial condensation are realized by the reflux in the tower, so that the aim of separating each component of air is fulfilled. Since the introduction of the Mellapak structured packing from Sulzer company into air separation plants in the 80 th 20 th century, the structured packing tower gradually replaced the traditional plate column in the cryogenic rectification process due to its excellent performance, promoting the technical change in the cryogenic air separation field. The regular packing defines a gas-liquid flow path through regular geometric arrangement and stacking, and the plate corrugated structure ensures that the regular packing has very high specific surface area and porosity, so that the regular packing has lower pressure drop, higher efficiency and capacity, the volume of the rectifying tower and the energy consumption of an air separation unit can be obviously reduced, and the full-rectification hydrogen-free argon preparation of the auxiliary tower can be realized.
The rectifying tower is the core of low-temperature air separation, and the energy consumption accounts for 30-40% of the total energy consumption of the air separation system. Even though the conventional structured packing is mature and applied to low-temperature air separation, the flow and mass transfer process in the rectifying tower still occupies most of the whole air separation flow path, and the effective energy loss of pressure drop and mass transfer respectively accounts for 15 percent and 55 percent of the total loss. Therefore, the cryogenic rectification packed tower still has a large performance improvement space, especially in the aspect of strengthening gas-liquid interphase mass transfer.
Currently, design optimization to improve the separation performance of rectification is mainly focused on the packing itself and the associated column internals. Chinese patent publication No. CN108479685A discloses a regular packing fixed wall flow ring, which is additionally provided with tongues to make packing more tightly attached to the column wall, thereby effectively inhibiting the wall flow. Chinese patent publication No. CN110449113A discloses a high-efficiency structured packing, in which the inlet and outlet of the packing are changed into vertical flow channels to reduce the interfacial resistance of the packing units, and increase the aperture ratio and wettability. However, as the installation and design technology of the packed tower matures, the improvement of the mass transfer efficiency of rectification by the optimization component is very limited. Therefore, there is a need for improvement in cryogenic rectification mechanisms to optimize separation performance.
Disclosure of Invention
The invention aims to provide a rotating magnetic field device for strengthening low-temperature rectification separation and a rectification tower, which can accelerate the update of the surface temperature and concentration of a liquid film and strengthen the heat and mass transfer process of a gas-liquid interface in a filler.
In order to achieve the above object, in a first aspect, the rotating magnetic field device for enhancing cryogenic rectification separation provided by the present invention comprises three groups of iron cores uniformly arranged around a packing layer, wherein all the iron cores are wound with metal coils in the same direction;
sine alternating current is introduced into the metal coils, the current directions of the alternating current introduced into the two metal coils of the same iron core group are opposite, and the phase difference of the alternating current introduced into the adjacent iron core groups is 120 degrees.
The air separation targets are mainly oxygen and nitrogen. Oxygen is the only component in air that has paramagnetism, while liquid oxygen is the pure liquid that has been found to have the highest paramagnetism. Under the standard state, the magnetic susceptibility of oxygen is 300 times that of nitrogen with diamagnetism. The magnetic reinforcing rectification filler utilizes the magnetism of oxygen to reinforce the heat and mass transfer process in the rectification filler, and oxygen can receive the effect of magnetic moment in a changing magnetic field, and the effect can make the magnetic moment of oxygen rotate towards the direction of an external magnetic field, so that each oxygen molecule can rotate along with the external magnetic field to generate vortex disturbance, the concentration updating of a gas-liquid interface is reinforced, and the mass transfer efficiency is further improved. In the technical scheme, three pairs of alternating current windings are arranged around the filler layer, a unidirectional rotating magnetic field is realized in the filler, rotating magnetic torque is applied to oxygen components in working media in the filler, and the gas-liquid countercurrent falling film mass transfer process on the surface of the filler is strengthened.
Optionally, in one embodiment, the iron core is installed in a tower wall of the rectifying tower, and one end of the iron core close to the packing layer is in a frustum shape. The wound metal coil can be prevented from falling off.
Optionally, in one embodiment, a wall flow prevention ring is arranged around the packing layer. The wall flow liquid can be prevented from flowing into the installation area of the iron core, so that the liquid is retained, and the normal operation of the rotating magnetic field device is influenced.
Optionally, in one embodiment, the anti-wall flow rings are disposed along top and bottom edges of the packing layer.
Optionally, in one embodiment, the packing layer is cylindrical, adjacent cores are separated by 60 ° with respect to the center of the packing layer, and the cores diametrically opposite along the packing layer are in the same group.
In a second aspect, the present invention provides a rectification column having a packing layer therein, and a rotating magnetic field device for enhancing cryogenic rectification separation as described above. And a groove for mounting the iron core is arranged on the tower wall of the rectifying tower. The iron core is arranged in the tower wall of the rectifying tower, so that the size is small, and the original function of the rectifying tower is not influenced.
Compared with the prior art, the invention has the advantages that:
the invention adopts three groups of alternating current coils to construct a rotating magnetic field in the filler, applies rotating magnetic torque to oxygen components in a liquid mixture in the filler, and can strengthen the surface concentration field and temperature field updating of a liquid film in the filler and strengthen the gas-liquid interface heat and mass transfer.
Drawings
FIG. 1 is a schematic structural diagram of a rotating magnetic field device disposed around structured packing in an embodiment of the present invention;
FIG. 2 is a schematic diagram of a rotating magnetic field apparatus using three-phase alternating current to generate a rotating magnetic field according to an embodiment of the present invention;
FIG. 3 is a diagram illustrating the alternating current phase of each iron core coil in accordance with an embodiment of the present invention;
FIG. 4 is a side cross-sectional view of an embodiment of the present invention with the iron core embedded in the rectifying tower wall;
fig. 5 is a top sectional view of the iron core embedded in the rectifying tower wall in the embodiment of the present invention.
The figures are numbered: 001-tower wall, 100-structured packing layer, 200-iron core, 201-metal coil, 300-wall flow prevention ring, 400-magnetic induction line and 500-magnetic field rotation direction.
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 rotating magnetic field device for enhancing cryogenic rectification separation in this embodiment is installed in a rectification tower, the rectification tower has a structured packing layer 100 therein, the rotating magnetic field device includes three sets of iron cores 200 disposed around the structured packing layer 100, and all the iron cores 200 are wound with metal coils 201 in the same direction.
Referring to fig. 4 and 5, a groove for mounting the iron core 200 is provided on the column wall 001 of the rectifying column. Install iron core 200 in the recess, the length of iron core 200 is equivalent with the length of recess, and is small, does not influence the function originally of rectifying column. The front end of the iron core 200 is in a quadrangular frustum pyramid shape, so that the wound metal coil 201 is prevented from falling off. The quadrangular frustum pyramid at the front end of the iron core 200 is slightly smaller than the area of the groove.
The wall flow prevention ring 300 is arranged around the regular packing layer 100, the wall flow prevention ring 300 is arranged between the regular packing layer 100 and the iron core 200, and wall flow liquid is prevented from flowing into the installation area of the iron core 200, namely in the groove, so that the liquid is retained, and the normal operation of the rotating magnetic field device is influenced.
Six cores 200 are uniformly arranged around the structured packing layer 100, and adjacent cores differ by 60 ° with respect to the center of the packing. The metal coil 201 is wound on the iron core 200, and the winding direction of the metal coil 201 on all the iron cores 200 is the same. All the metal coils 201 are supplied with sine type alternating current.
As shown in fig. 2, the opposite metal coils 201 are regarded as a coil group, in the figure, U1 and U2 are coil groups U, V1 and V2 are coil groups V, and W1 and W2 are coil groups W, and the current directions of the alternating currents passed through the two metal coils 201 of the same coil group are opposite. Fig. 3 shows the phase of the sinusoidally alternating currents of coil set U, coil set V and coil set W. As shown in fig. 3, the phases of the alternating currents passed through the adjacent coil groups are different by 120 °. Under the excitation of the alternating current shown in fig. 3, the magnetic induction lines 400 generated by the three pairs of coil sets are vector-added in the central packing area to form a unidirectional rotating magnetic field, and the rotating direction 500 of the magnetic field is the direction of the column around the structured packing layer 100. The core 200 serves to enhance the magnetic field strength.
In the process of separating the air by cryogenic rectification, the oxygen-nitrogen mixed liquid flows down in a falling film in the structured packing layer 100, and three pairs of metal coils 201 generate a magnetic field rotating in a single direction in a packing area through alternating current. Oxygen components in the low-temperature liquid flowing down in the regular filler layer 100 deflect along with the rotation direction of the magnetic field, and each oxygen molecule becomes a disturbance source in the liquid film, so that the updating of a concentration field and a temperature field on the surface of the liquid film is accelerated, and the transfer process of oxygen, nitrogen and thermal mass in the filler is strengthened.
Claims (3)
1. A rotating magnetic field device for strengthening low-temperature rectification separation is characterized by comprising three groups of iron cores which are uniformly arranged around a packing layer, wherein metal coils in the same direction are wound on all the iron cores; the packing layer is cylindrical, the difference between adjacent iron cores and the center of the packing layer is 60 degrees, and the iron cores with opposite diameters along the packing layer are in the same group;
the metal coils are internally provided with sine alternating current, the current directions of the alternating current conducted by the two metal coils of the same iron core group are opposite, and the phase difference of the alternating current conducted by the adjacent iron core groups is 120 degrees;
the iron core is arranged in the tower wall of the rectifying tower, and one end of the iron core, which is close to the packing layer, is in a frustum pyramid shape; the periphery of the packing layer is provided with a wall flow prevention ring which is arranged along the top edge and the bottom edge of the packing layer;
in the process of low-temperature rectification air separation, three pairs of metal coils generate a unidirectional rotating magnetic field in a packing area through alternating current; when the oxygen-nitrogen mixed liquid flows down in the filler layer, oxygen components in the low-temperature liquid deflect along with the rotation direction of the magnetic field, and each oxygen molecule becomes a disturbance source in the liquid film, so that the updating of the concentration field and the temperature field on the surface of the liquid film is accelerated, and the transfer process of the thermal mass of oxygen and nitrogen in the filler is strengthened.
2. A rectifying column, characterized in that the rectifying column is internally provided with a packing layer and a rotating magnetic field device for strengthening low-temperature rectification separation as claimed in claim 1.
3. The rectifying tower according to claim 2, wherein a groove for mounting the iron core is provided on a tower wall of the rectifying tower.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010437220.6A CN111729337B (en) | 2020-05-21 | 2020-05-21 | Rotating magnetic field device for strengthening low-temperature rectification separation and rectification tower |
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| CN202010437220.6A CN111729337B (en) | 2020-05-21 | 2020-05-21 | Rotating magnetic field device for strengthening low-temperature rectification separation and rectification tower |
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| CN111729337B true CN111729337B (en) | 2022-02-11 |
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| 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 |
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