CN118007153A - Bionic flow field structure with round petals - Google Patents
Bionic flow field structure with round petals Download PDFInfo
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- CN118007153A CN118007153A CN202410129017.0A CN202410129017A CN118007153A CN 118007153 A CN118007153 A CN 118007153A CN 202410129017 A CN202410129017 A CN 202410129017A CN 118007153 A CN118007153 A CN 118007153A
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- shaped flow
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- 239000011664 nicotinic acid Substances 0.000 title claims abstract description 21
- 239000000376 reactant Substances 0.000 claims abstract description 50
- 238000004891 communication Methods 0.000 claims description 4
- 230000007423 decrease Effects 0.000 claims description 3
- 239000006260 foam Substances 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 2
- 229910002804 graphite Inorganic materials 0.000 claims description 2
- 239000010439 graphite Substances 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 230000003592 biomimetic effect Effects 0.000 claims 2
- 239000012528 membrane Substances 0.000 abstract description 14
- 239000001257 hydrogen Substances 0.000 description 12
- 229910052739 hydrogen Inorganic materials 0.000 description 12
- 238000012546 transfer Methods 0.000 description 9
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 8
- 230000003197 catalytic effect Effects 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 238000000034 method Methods 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 238000009792 diffusion process Methods 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 238000003487 electrochemical reaction Methods 0.000 description 3
- 238000005868 electrolysis reaction Methods 0.000 description 3
- -1 hydrogen ions Chemical class 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000012295 chemical reaction liquid Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005518 electrochemistry Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 239000007770 graphite material Substances 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000001699 photocatalysis Effects 0.000 description 1
- 238000002407 reforming Methods 0.000 description 1
- 230000004083 survival effect Effects 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
Landscapes
- Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
Abstract
The invention discloses a circular petal bionic flow field structure, which comprises a plurality of petal-shaped flow channels which are uniformly distributed on the surface of a circular flow field plate body and are symmetrical about the circle center of the flow field plate body, wherein one ends of the petal-shaped flow channels, which are close to the circle center of the flow field plate body, are mutually communicated, and annular flow channels communicated with the petal-shaped flow channels are arranged between two adjacent petal-shaped flow channels; and the outer circumference of the flow field plate body is provided with a reactant inlet or a product outlet which is communicated with the other end of the petal-shaped flow channel. The reactant, the temperature and the current density in the flow field are distributed more uniformly, so that the operation efficiency of the proton exchange membrane electrolytic cell is improved.
Description
Technical Field
The invention belongs to the technical field of electrochemistry, and particularly relates to a circular petal bionic flow field structure.
Background
Traditional fossil energy is the basis for human survival, but fossil energy reserves are limited and have adverse effects on the environment, forcing people to seek alternative energy to sustain long-term development. The hydrogen energy has the characteristics of high heat value, wide source, cleanness, high efficiency and the like, becomes an ideal alternative energy source, can be produced by coal gasification, methanol reforming, water electrolysis, photocatalytic water decomposition and other methods at present, and is a sustainable hydrogen production mode in the production methods of numerous hydrogen, and the hydrogen produced by the electrolysis of water in the proton exchange membrane electrolyzer in the hydrogen production process has high purity and no pollution, so the hydrogen energy has good development prospect.
In the process of hydrogen production by water electrolysis in a proton exchange membrane electrolytic tank, enough reaction liquid is provided for a catalytic layer by virtue of good mass transfer characteristics of a flow field, so that product gas generated by chemical reaction is accumulated, redundant gas is immediately removed, a large amount of protons and electrons are conveyed, once mass transfer of the flow field is blocked, the problems of uneven reactant distribution, uneven temperature distribution, water blockage and the like can occur, and the performance of the proton exchange membrane electrolytic tank can be rapidly reduced, and even an electrolytic tank system is damaged.
Therefore, the mass transfer process is enhanced by reasonably designing the flow field structure, and the method has important significance for long-term, efficient and stable operation of the proton exchange membrane electrolytic cell.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide a circular petal bionic flow field structure, and reactants, temperature and current density are distributed more uniformly.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
a bionic flow field structure of circular petals comprises a plurality of petal-shaped flow channels which are uniformly distributed on the surface of a circular flow field plate body and are symmetrical with respect to the circle center of the flow field plate body, one ends of the petal-shaped flow channels, which are close to the circle center of the flow field plate body, are mutually communicated, and annular flow channels communicated with the petal-shaped flow channels are arranged between two adjacent petal-shaped flow channels;
And the outer circumference of the flow field plate body is provided with a reactant inlet or a product outlet which is communicated with the other end of the petal-shaped flow channel.
Further, the number of reactant inlets is greater than the number of product outlets.
Further, the petal-shaped flow channels comprise a first petal-shaped flow channel, a second petal-shaped flow channel, a third petal-shaped flow channel, a fourth petal-shaped flow channel and a fifth petal-shaped flow channel which are sequentially arranged clockwise;
the reactant inlet comprises a first reactant inlet communicated with the first petal-shaped flow channel, a second reactant inlet communicated with the second petal-shaped flow channel and a third reactant inlet communicated with the fifth petal-shaped flow channel;
the product outlet includes a first product outlet in communication with the third petal-shaped flow channel and a second product outlet in communication with the fourth petal-shaped flow channel.
Further, the petal-shaped flow channels are formed by a plurality of arc-shaped flow channels which are symmetrically arranged relative to the radius of the flow field plate body.
Further, the width of the arc-shaped flow channels is 1mm, and the distance between two adjacent arc-shaped flow channels is 1mm.
Further, the annular flow channel is formed by a plurality of circular arc flow channels which are concentrically arranged with the flow field plate body, and the length of the circular arc flow channels gradually decreases towards the circle center direction of the flow field plate body.
Further, the width of the circular arc-shaped flow channels is 1mm, and the distance between two adjacent circular arc-shaped flow channels is 1mm.
Further, the flow field plate body is made of graphite, stainless steel or foam metal.
Compared with the prior art, the invention has the following technical effects:
The flow field plate takes the flowers as objects to carry out bionic design, a bionic flow field structure is constructed through a plurality of petal-shaped flow channels which are symmetrical with respect to the circle center of the flow field plate body and straight annular flow channels which are connected between two adjacent petal-shaped flow channels, the number of reaction liquid flow paths is increased by the petal-shaped flow channels, and compared with a traditional single channel, the flow resistance of the multi-channel structure is smaller, and the pressure drop is reduced; in addition, the annular flow channels are utilized to enable pressure difference to exist between the adjacent petal-shaped flow channels, reactant flow and mass transfer between the petal-shaped flow channels are enhanced, the intensity of cross flow under the ribs is increased, and the mass transfer level, the reactant concentration uniformity and the current density uniformity under the ribs of the reactant are improved, so that the operation efficiency of the proton exchange membrane electrolytic cell is improved. Therefore, the flow field structure can reduce pressure drop and improve mass transfer level, so that the flow field structure is suitable for proton exchange membrane electrolytic cells, fuel cells, flow batteries and other electrochemical devices, and has good universality.
The number of the reactant inlets is larger than that of the product outlets, so that the flow area of the fluid in the flow field is reduced, the flow velocity of the fluid in the flow channel is improved, the product gas can be promoted to be rapidly discharged out of the flow field, the gas blockage is prevented, the uniformity of current density distribution is effectively improved, and the performance of the electrolytic cell is improved.
The reactant inlets or the product outlets uniformly arranged on the outer circumference of the flow field plate body are directly communicated with the petal-shaped flow channels, the reactants are supplied to flow in by the three reactant inlets, and the products flow out by the two product outlets, so that the flow path of the reactants is shortened, the pressure drop is further reduced, the pressure difference between the reactant inlets and the product outlets is reduced, the reactant liquid is fully mixed in the flow field, the uniformity of reactant concentration distribution and temperature distribution is ensured, and the operation efficiency of the proton exchange membrane electrolytic cell is effectively improved.
The petal-shaped flow channels which are similar to the parallel flow channels and are formed by taking the radius of the flow field plate body as the symmetry axis are adopted by the plurality of arc-shaped flow channels, so that reactant liquid can flow to the electrode through a plurality of channels at a high flow speed and generate electrochemical reaction, and the petal-shaped flow channels are directly connected with the reactant inlet and the product outlet, thereby being beneficial to reducing the overall pressure drop level of the flow field and further reducing the pumping loss of the electrolytic tank.
Drawings
Fig. 1: the structure diagram of the circular petal bionic flow field is shown in the invention;
fig. 2: the flow field plate with the circular petal bionic flow field is structurally schematic;
fig. 3: the flow field plate with the circular petal bionic flow field is applied to an electrolytic tank;
In the figure: 1. a flow field plate body; 2. a first petal-shaped flow channel; 3. a second petal-shaped flow channel; 4. a third petal-shaped flow channel; 5. a fourth petal-shaped flow channel; 6. a fifth petal-shaped flow channel; 7. an annular flow passage; 8. a first reactant inlet; 9. a second reactant inlet; 10. a first product outlet; 11. a second product outlet; 12. a third reactant inlet; 13. an anode flow field plate; 14. an anode diffusion layer; 15. an anode catalytic layer; 16. a proton exchange membrane; 17. a cathode catalytic layer; 18. a cathode diffusion layer; 19. a cathode flow field plate.
Detailed Description
The following examples illustrate the invention in further detail.
As shown in fig. 1 and 2, a circular petal bionic flow field structure comprises five petal-shaped flow channels which are uniformly distributed on the surface of a circular flow field plate body 1 and are symmetrical about the circle center of the flow field plate body, wherein one ends of the five petal-shaped flow channels, which are close to the circle center of the flow field plate body 1, are mutually communicated, and annular flow channels 7 communicated with the five petal-shaped flow channels are arranged between two adjacent petal-shaped flow channels;
Two adjacent petal-shaped flow channels are communicated through the annular flow channel 7, so that pressure difference exists between the two adjacent petal-shaped flow channels, the overall pressure drop level of a flow field is reduced, the flow and mass transfer of reactants between the petal-shaped flow channels are increased, the intensity of cross flow under ribs is increased, the mass transfer level under the ribs of the reactants is improved, the work loss of an electrolytic tank pump is reduced, and the energy conversion efficiency is improved;
The outer circumference of the flow field plate body 1 is sequentially and uniformly provided with a first reactant inlet 8, a second reactant inlet 9, a first product outlet 10, a second product outlet 11 and a third reactant inlet 12 along the clockwise direction;
The petal-shaped flow channels comprise a first petal-shaped flow channel 2, a second petal-shaped flow channel 3, a third petal-shaped flow channel 4, a fourth petal-shaped flow channel 5 and a fifth petal-shaped flow channel 6 which are sequentially and uniformly arranged clockwise, wherein: the first petal-shaped flow channel 2 is communicated with a first reactant inlet 8, the second petal-shaped flow channel 3 is communicated with a second reactant inlet 9, the fifth petal-shaped flow channel 6 is communicated with a third reactant inlet 12, the third petal-shaped flow channel 4 is communicated with a first product outlet 10, and the fourth petal-shaped flow channel 5 is communicated with a second product outlet 11;
Simultaneously pumping reactants from the first reactant inlet 8, the second reactant inlet 9 and the third reactant inlet 12, enabling the reactants to enter the flow field along the radial direction of the flow field plate body 1, flow through the petal-shaped flow channels and the annular flow channels 7, and simultaneously flow out of the flow field from the first product outlet 10 and the first product outlet 11;
The petal-shaped flow channels are formed by 5 arc-shaped flow channels symmetrically arranged with respect to the radius of the flow field plate body 1, the width of each arc-shaped flow channel is 1mm, the distance between two adjacent arc-shaped flow channels is 1mm, and the specification, the size and the number of the arc-shaped flow channels can be adjusted according to requirements; the petal-shaped flow channel is provided with a plurality of passages, so that the flow paths of reactant fluid are increased, the pressure drop level is lower, the reactant fluid is ensured to fully contact with more active sites on the electrode after entering the flow channel at a faster flow rate, the occurrence speed of electrochemical reaction is improved, and the performance of the electrolytic cell is improved;
The annular flow channel 7 is formed by a plurality of circular arc flow channels which are concentrically arranged with the flow field plate body 1, the length of each circular arc flow channel sequentially decreases towards the circle center direction of the flow field plate body 1, the width of each circular arc flow channel is 1mm, the distance between every two adjacent circular arc flow channels is 1mm, and the size specification and the number of the circular arc flow channels can be flexibly adjusted according to requirements.
Preferably, the flow field plate body 1 is made of foam metal material, high-conductivity graphite material or corrosion-resistant stainless steel material.
Preferably, the annular flow channel 7 can be replaced by an existing lattice flow channel or serpentine flow channel.
The circular petal bionic flow field structure of the embodiment is not only suitable for proton exchange membrane electrolytic cells, but also suitable for various electrochemical energy conversion devices such as flow batteries, fuel cells and the like, and takes the proton exchange membrane electrolytic cells as an example to explain the working principle of the circular petal bionic flow field structure;
as shown in fig. 3, when the flow field plate with the circular petal bionic flow field structure of the embodiment is applied to a proton exchange membrane electrolytic cell, the working process of the proton exchange membrane electrolytic cell comprises the following steps:
Step 1, pumping electrolyte from a first reactant inlet 8, a second reactant inlet 9 and a third reactant inlet 12 of an anode flow field plate 13 and a cathode flow field plate 19 into a first petal-shaped flow channel 2, a second petal-shaped flow channel 3 and a fifth petal-shaped flow channel 6, and flowing through an annular straight flow channel 7, a third petal-shaped flow channel 4 and a fourth petal-shaped flow channel 5, carrying out mass transfer through an anode diffusion layer 14 and a cathode diffusion layer 18 and reaching an anode catalytic layer 15 and a cathode catalytic layer 18;
step 2, separating out oxygen and hydrogen ions from the liquid water in the anode catalytic layer 14, releasing electrons, transferring the electrons to the cathode catalytic layer 17 through an external circuit, and diffusing the hydrogen ions to the cathode catalytic layer 17 through the proton exchange membrane 16 and combining the hydrogen ions with the electrons to generate hydrogen;
Step 3, along with the progress of the electrochemical reaction process, the mixture of oxygen and liquid water generated by the anode reaction is discharged from the first product outlet 10 of the anode flow field and the second product outlet 11 of the anode flow field, and the mixture of hydrogen and liquid water generated by the cathode reaction is discharged from the first product outlet 10 of the cathode flow field and the second product outlet 11 of the cathode flow field.
Claims (8)
1. The circular petal bionic flow field structure is characterized by comprising a plurality of petal-shaped flow channels which are distributed on the surface of a circular flow field plate body (1) and are symmetrical with respect to the circle center of the flow field plate body, wherein one ends of the petal-shaped flow channels, which are close to the circle center of the flow field plate body (1), are mutually communicated, and an annular flow channel (7) communicated with the petal-shaped flow channels is arranged between two adjacent petal-shaped flow channels;
the outer circumference of the flow field plate body (1) is uniformly provided with a reactant inlet or a product outlet which is communicated with the other end of the petal-shaped flow channel.
2. The circular petal biomimetic flow field structure according to claim 1, wherein the number of reactant inlets is greater than the number of product outlets.
3. The circular petal-shaped bionic flow field structure according to claim 1 or 2, wherein the petal-shaped flow channels comprise a first petal-shaped flow channel (2), a second petal-shaped flow channel (3), a third petal-shaped flow channel (4), a fourth petal-shaped flow channel (5) and a fifth petal-shaped flow channel (6) which are sequentially arranged clockwise;
The reactant inlet comprises a first reactant inlet (8) communicated with the first petal-shaped flow channel (2), a second reactant inlet (9) communicated with the second petal-shaped flow channel (3) and a third reactant inlet (12) communicated with the fifth petal-shaped flow channel (6);
The product outlet comprises a first product outlet (10) in communication with the third petal-shaped flow channel (4) and a second product outlet (11) in communication with the fourth petal-shaped flow channel (5).
4. The circular petal-shaped bionic flow field structure according to claim 1 or 2, wherein the petal-shaped flow channels are composed of a plurality of arc-shaped flow channels symmetrically arranged with respect to the radius of the flow field plate body (1).
5. The circular petal bionic flow field structure according to claim 4, wherein the width of the arc-shaped flow channels is 1mm, and the interval between two adjacent arc-shaped flow channels is 1mm.
6. The circular petal bionic flow field structure according to claim 1 or 2, wherein the annular flow channel (7) is formed by a plurality of circular arc-shaped flow channels which are arranged concentrically with the flow field plate body (1), and the length of the circular arc-shaped flow channels gradually decreases towards the circle center direction of the flow field plate body (1).
7. The circular petal bionic flow field structure according to claim 6, wherein the width of the circular arc-shaped flow channels is 1mm, and the interval between two adjacent circular arc-shaped flow channels is 1mm.
8. The circular petal biomimetic flow field structure according to claim 1 or2, wherein the flow field plate body (1) is made of graphite, stainless steel or foam metal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410129017.0A CN118007153A (en) | 2024-01-30 | 2024-01-30 | Bionic flow field structure with round petals |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410129017.0A CN118007153A (en) | 2024-01-30 | 2024-01-30 | Bionic flow field structure with round petals |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118007153A true CN118007153A (en) | 2024-05-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410129017.0A Pending CN118007153A (en) | 2024-01-30 | 2024-01-30 | Bionic flow field structure with round petals |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN118007153A (en) |
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2024
- 2024-01-30 CN CN202410129017.0A patent/CN118007153A/en active Pending
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