CN216386866U - Evaluation device for electrolytic hydrogen production alkali liquor - Google Patents
Evaluation device for electrolytic hydrogen production alkali liquor Download PDFInfo
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- CN216386866U CN216386866U CN202122895491.9U CN202122895491U CN216386866U CN 216386866 U CN216386866 U CN 216386866U CN 202122895491 U CN202122895491 U CN 202122895491U CN 216386866 U CN216386866 U CN 216386866U
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Abstract
The utility model belongs to the technical field of hydrogen production by water electrolysis, and discloses an evaluation device for hydrogen production by electrolysis, which comprises a simulation electrolytic tank, a cathode alkali liquor storage tank, a cathode alkali liquor circulating pump, an anode alkali liquor storage tank, an anode alkali liquor circulating pump and a direct-current power supply; the simulated electrolytic tank comprises a negative plate, a cathode net, a diaphragm, an anode net and an anode plate which are sequentially connected, wherein an inlet of a cathode alkali liquor storage tank is connected with an alkali liquor outlet of the negative plate, and an outlet of the cathode alkali liquor storage tank is connected with an alkali liquor inlet of the negative plate through a cathode alkali liquor circulating pump; the inlet of the anode alkali liquor storage tank is connected with the alkali liquor outlet of the anode plate, and the outlet of the anode alkali liquor storage tank is connected with the alkali liquor inlet of the anode plate through an anode alkali liquor circulating pump; the top of the cathode plate is provided with a cathode binding post, and the top of the anode plate is provided with an anode binding post; the positive pole of the direct current power supply is connected with the positive terminal, and the negative pole is connected with the negative terminal. The problem that the alkali liquor property can not be quantitatively evaluated in the operation process of the existing industrial electrolytic hydrogen production system is solved.
Description
Technical Field
The utility model belongs to the technical field of hydrogen production by water electrolysis, and particularly relates to an evaluation device for an alkali liquor for hydrogen production by electrolysis.
Background
The hydrogen is regarded as the most ideal energy carrier due to the advantages of green, low carbon, high efficiency, storage and transportation and the like. The hydrogen production by water electrolysis by utilizing renewable energy sources such as wind power, photovoltaic and the like is one of the most important production modes of hydrogen in the future. At present, the water electrolysis hydrogen production technology mainly comprises alkaline water electrolysis hydrogen production, solid polymer water electrolysis hydrogen production and solid oxide water electrolysis hydrogen production, and the alkaline water electrolysis hydrogen production technology is relatively mature, the equipment manufacturing cost is low, and the scale of a single device is large, so the water electrolysis hydrogen production technology is mainly adopted at present.
The electrolyte for producing hydrogen by alkaline electrolysis of water usually adopts 30 percent of potassium hydroxide, the temperature of the alkaline solution reaches 70-90 ℃ during operation, certain corrosion can be generated on polar plates and pipelines during long-time operation, on one hand, the equipment body can be influenced, and on the other hand, the electrolysis reaction process of the alkaline solution is influenced due to the fact that impurities are brought into the alkaline solution, the properties are changed. At present, no method for detecting and evaluating the alkali liquor for hydrogen production by electrolysis exists, and in the industrial production process, the density of the alkali liquor is generally monitored to properly supplement the lost alkali. The detection and evaluation of the alkali liquor property independently are of great help to the analysis of the operation state of the electrolytic hydrogen production system, the targeted adjustment of system parameters and the operation and maintenance.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an evaluation device for electrolytic hydrogen production alkali liquor, which solves the problem that the alkali liquor property can not be quantitatively evaluated in the operation process of the existing industrial electrolytic hydrogen production system.
The utility model is realized by the following technical scheme:
an evaluation device for electrolytic hydrogen production alkali liquor comprises a simulation electrolytic tank, a cathode alkali liquor storage tank, a cathode alkali liquor circulating pump, an anode alkali liquor storage tank, an anode alkali liquor circulating pump and a direct current power supply;
the simulated electrolytic tank comprises a negative plate, a negative net, a diaphragm, an anode net and an anode plate which are connected in sequence, wherein an alkali liquor outlet and an alkali liquor inlet are respectively formed on the negative plate and the anode plate;
an inlet of the cathode alkali liquor storage tank is connected with an alkali liquor outlet of the cathode plate, and an outlet of the cathode alkali liquor storage tank is connected with an alkali liquor inlet of the cathode plate through a cathode alkali liquor circulating pump;
the inlet of the anode alkali liquor storage tank is connected with the alkali liquor outlet of the anode plate, and the outlet of the anode alkali liquor storage tank is connected with the alkali liquor inlet of the anode plate through an anode alkali liquor circulating pump;
the top of the cathode plate is provided with a cathode binding post, and the top of the anode plate is provided with an anode binding post; the positive pole of the direct current power supply is connected with the positive terminal, the negative pole of the direct current power supply is connected with the negative terminal, and the direct current power supply is used for monitoring the working voltage between the negative plate and the positive plate.
Furthermore, the middle part of the negative plate is provided with a groove, a plurality of bulges are arranged in the groove, and the negative net is arranged in the groove.
Furthermore, a groove is formed in the middle of the anode plate, a plurality of bulges are arranged in the groove, and the anode mesh is arranged in the groove.
Further, the height of the protrusion is lower than the edge of the groove.
Further, the alkali liquor inlet is arranged at the lower sides of the anode plate and the cathode plate, and the alkali liquor outlet is arranged at the upper sides of the anode plate and the cathode plate.
Furthermore, bolt holes are formed in the peripheries of the cathode plate and the anode plate, and the cathode plate and the anode plate are fixedly connected through bolts.
Further, the cathode mesh and the anode mesh are rectangular nickel meshes.
Furthermore, the middle part of the diaphragm is made of polyphenylene sulfide woven cloth, and the periphery of the diaphragm is made of polytetrafluoroethylene.
Compared with the prior art, the utility model has the following beneficial technical effects:
the utility model discloses an evaluation device for an alkali liquor for electrolytic hydrogen production, which comprises a simulated electrolytic bath, an alkali liquor storage tank, an alkali liquor circulating pump and a direct-current power supply, wherein newly prepared alkali liquor and waste alkali liquor are respectively placed in the alkali liquor storage tank for circulation, the direct-current power supply is switched on for electrolytic hydrogen production, the electrochemical properties of an alkaline electrolyte can be detected off-line by comparing the stable voltage values and the like, the real process of the alkaline electrolytic hydrogen production is simulated, the actual working properties of the electrolyte can be fully reflected, and meanwhile, the detection process has the advantages of small sampling amount, short period and simple operation. The device can quantitatively evaluate the influence of the electrolyte on the actual electrolytic process, judge whether the alkali liquor needs to be replaced or not, solve the problem that the alkali liquor property cannot be quantitatively evaluated in the operation process of the existing industrial electrolytic hydrogen production system, and have practical guiding significance for industrial application; the device has simple structure and is easy to popularize and apply.
Drawings
FIG. 1 is a schematic structural diagram of an evaluation device for electrolytic hydrogen production alkali liquor according to the present invention;
FIG. 2 is a schematic diagram of a simulated electrolytic cell of the present invention.
Wherein, 1 is a simulated electrolytic tank, 2 is a cathode alkali liquor storage tank, 3 is a cathode alkali liquor circulating pump, 4 is an anode alkali liquor storage tank, 5 is an anode alkali liquor circulating pump, and 6 is a direct current power supply;
11 is a cathode plate, 12 is a cathode net, 13 is a diaphragm, 14 is an anode net, 15 is an anode plate, 16 is a cathode binding post, and 17 is a cathode binding post.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
As shown in figure 1, the utility model discloses an evaluation device for electrolytic hydrogen production alkali liquor, which comprises a simulated electrolytic tank 1, a cathode alkali liquor storage tank 2, a cathode alkali liquor circulating pump 3, an anode alkali liquor storage tank 4, an anode alkali liquor circulating pump 5 and a direct current power supply 6, wherein the cathode alkali liquor storage tank 2 and the cathode alkali liquor circulating pump 3 are arranged on the cathode side of the simulated electrolytic tank 1, and the anode alkali liquor storage tank 4 and the anode alkali liquor circulating pump 5 are arranged on the anode side of the simulated electrolytic tank 1.
As shown in figure 2, the simulated electrolytic tank 1 comprises a cathode plate 11, a cathode net 12, a diaphragm 13, an anode net 14 and an anode plate 15 which are connected in sequence, wherein the upper sides of the cathode plate 11 and the anode plate 15 are provided with an alkali liquor outlet, and the lower sides are provided with an alkali liquor inlet.
As shown in figure 1, an inlet of a cathode alkali liquor storage tank 2 is connected with an alkali liquor outlet of a cathode plate 11, and an outlet of the cathode alkali liquor storage tank 2 is connected with an inlet of a cathode alkali liquor circulating pump 3; the outlet of the cathode alkali liquor circulating pump 3 is connected with the alkali liquor inlet of the cathode plate 11;
the inlet of the anode alkali liquor storage tank 4 is connected with the alkali liquor outlet of the anode plate 15, the outlet of the anode alkali liquor storage tank 4 is connected with the inlet of the anode alkali liquor circulating pump 5, and the outlet of the anode alkali liquor circulating pump 5 is connected with the alkali liquor inlet of the anode plate 15.
A negative terminal 16 is arranged at the top of the negative plate 11, and a positive terminal 17 is arranged at the top of the positive plate 15; the positive pole of the direct current power supply 6 is connected with the positive terminal 17, the negative pole is connected with the negative terminal 16, and the direct current power supply 6 is used for monitoring the working voltage between the negative plate 11 and the positive plate 15.
Specifically, the middle parts of the cathode plate 11 and the anode plate 15 are rectangular grooves, the insides of the grooves are cylindrical bulges, the heights of the cylindrical bulges are lower than the edges of the grooves, and the height difference is equal to the thickness of the cathode mesh 12 and the anode mesh 14.
The alkali liquor outlet and the alkali liquor inlet are arranged by bypassing the groove.
Bolt holes are formed in the peripheries of the cathode plate 11 and the anode plate 15, and the cathode plate 11 and the anode plate 15 are fixedly connected through bolts.
The cathode mesh 12 and the anode mesh 14 are rectangular nickel meshes, and the size of the nickel meshes is the same as that of the rectangular grooves in the middle parts of the cathode plate 11 and the anode plate 15;
preferably, the diaphragm 13 is composed of two parts, the middle part is polyphenylene sulfide woven cloth, and the periphery is polytetrafluoroethylene plastic.
The use method of the device for evaluating the hydrogen production alkali liquor by electrolysis is realized by using the system, and comprises the following steps:
1) preparing a potassium hydroxide solution, and respectively placing the potassium hydroxide solution in a cathode alkali liquor storage tank 2 and an anode alkali liquor storage tank 4;
2) starting a cathode alkali liquor circulating pump 3 and an anode alkali liquor circulating pump 5, wherein alkali liquor in a cathode alkali liquor storage tank 2 flows in from an alkali liquor inlet of a cathode plate 11, and flows back to the cathode alkali liquor storage tank 2 from an alkali liquor outlet of the cathode plate 11 after electrolysis in the simulated electrolytic tank 1; meanwhile, the alkali liquor in the anode alkali liquor storage tank 4 flows in from the alkali liquor inlet of the anode plate 15, and flows back to the anode alkali liquor storage tank 4 from the alkali liquor outlet of the anode plate 15 after being electrolyzed in the simulated electrolytic tank 1;
3) starting the direct current power supply 6, adjusting the current density to a set value, and starting the hydrogen production process;
4) monitoring the change of the voltage along with the time, continuing to react for 10min after the voltage is stabilized, and recording the average value VF1 of the voltage within 10 min;
5) closing the direct current power supply 6 and the alkali liquor circulating pump, discharging alkali liquor in the cathode alkali liquor storage tank 2 and the anode alkali liquor storage tank 4, and replacing the alkali liquor with pure water;
6) starting a cathode alkali liquor circulating pump 3 and an anode alkali liquor circulating pump 5, washing the electrolytic tank and the pipeline, repeating the pure water washing process until the pH value of the aqueous solution is 7-8;
7) discharging the pure water in the cathode alkali liquor storage tank 2 and the anode alkali liquor storage tank 4, and replacing the pure water with waste alkali liquor obtained from an industrial alkaline electrolytic bath;
8) starting a cathode alkali liquor circulating pump 3 and an anode alkali liquor circulating pump 5, starting a direct-current power supply 6, adjusting the current density to a set value, and starting a hydrogen production process;
9) the direct current power supply 6 monitors the change of the voltage along with the time in real time, continuously reacts for 10min after the voltage is stabilized, and records the average value VF2 of the voltage within 10 min;
10) calculating VF2/VF1, and when VF2/VF1 is more than or equal to 1.1, indicating that the hydrogen production is carried out by continuously using the alkali liquor, the energy consumption is obviously increased, and the alkali liquor of the hydrogen production system needs to be replaced; when VF2/VF1 is less than 1.1, the alkali liquor of the hydrogen production system can be normally used.
In the step 1), the concentration of the alkali liquor is the same as that of the initial alkali liquor in the industrial alkaline electrolytic bath in the step 7), and the mass concentration of the potassium hydroxide is 20-30%.
The current density of the step 3) is the same as that of the step 8), and the current density is 50mA/cm2-200mA/cm2。
In the step 4) and the step 9), when the voltage is stable, the voltage change value is less than or equal to 5 mV/min.
Claims (8)
1. An evaluation device for electrolytic hydrogen production alkali liquor is characterized by comprising a simulation electrolytic tank (1), a cathode alkali liquor storage tank (2), a cathode alkali liquor circulating pump (3), an anode alkali liquor storage tank (4), an anode alkali liquor circulating pump (5) and a direct current power supply (6);
the simulated electrolytic tank (1) comprises a cathode plate (11), a cathode net (12), a diaphragm (13), an anode net (14) and an anode plate (15) which are connected in sequence, wherein an alkali liquor outlet and an alkali liquor inlet are respectively formed in the cathode plate (11) and the anode plate (15);
an inlet of the cathode alkali liquor storage tank (2) is connected with an alkali liquor outlet of the cathode plate (11), and an outlet of the cathode alkali liquor storage tank (2) is connected with an alkali liquor inlet of the cathode plate (11) through a cathode alkali liquor circulating pump (3);
an inlet of the anode alkali liquor storage tank (4) is connected with an alkali liquor outlet of the anode plate (15), and an outlet of the anode alkali liquor storage tank (4) is connected with an alkali liquor inlet of the anode plate (15) through an anode alkali liquor circulating pump (5);
a negative terminal (16) is arranged at the top of the negative plate (11), and a positive terminal (17) is arranged at the top of the positive plate (15); the positive pole of the direct current power supply (6) is connected with the positive pole binding post (17), the negative pole is connected with the negative pole binding post (16), and the direct current power supply (6) is used for monitoring the working voltage between the negative plate (11) and the positive plate (15).
2. The evaluation device for the electrolytic hydrogen production alkali liquor according to claim 1, characterized in that the middle part of the cathode plate (11) is provided with a groove, a plurality of bulges are arranged in the groove, and the cathode mesh (12) is arranged in the groove.
3. The evaluation device for the electrolytic hydrogen production alkali liquor according to claim 1, characterized in that a groove is formed in the middle of the anode plate (15), a plurality of protrusions are arranged in the groove, and the anode mesh (14) is arranged in the groove.
4. An apparatus for evaluating electrolytic hydrogen production alkali according to claim 2 or 3, wherein the height of the protrusion is lower than the edge of the groove.
5. The apparatus for evaluating electrolytic hydrogen production alkali according to claim 1, wherein the alkali inlet is arranged at the lower side of the anode plate (15) and the cathode plate (11), and the alkali outlet is arranged at the upper side of the anode plate (15) and the cathode plate (11).
6. The evaluation device for the electrolytic hydrogen production alkali liquor according to claim 1, characterized in that bolt holes are formed around the cathode plate (11) and the anode plate (15), and the cathode plate (11) and the anode plate (15) are fixedly connected through bolts.
7. The apparatus for evaluating electrolytic hydrogen production alkali according to claim 1, wherein the cathode mesh (12) and the anode mesh (14) are rectangular nickel meshes.
8. The device for evaluating the hydrogen production alkali liquor through electrolysis as claimed in claim 1, wherein the middle part of the diaphragm (13) is made of polyphenylene sulfide woven cloth, and the periphery of the diaphragm is made of polytetrafluoroethylene.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122895491.9U CN216386866U (en) | 2021-11-23 | 2021-11-23 | Evaluation device for electrolytic hydrogen production alkali liquor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122895491.9U CN216386866U (en) | 2021-11-23 | 2021-11-23 | Evaluation device for electrolytic hydrogen production alkali liquor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115074765A (en) * | 2022-05-31 | 2022-09-20 | 同济大学 | Combined type alkali liquor tank and alkali water electrolysis hydrogen production system with same |
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2021
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115074765A (en) * | 2022-05-31 | 2022-09-20 | 同济大学 | Combined type alkali liquor tank and alkali water electrolysis hydrogen production system with same |
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