CN216386866U - Evaluation device for electrolytic hydrogen production alkali liquor - Google Patents

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

An evaluation device for electrolysis of hydrogen-producing lye

technical field

The utility model belongs to the technical field of hydrogen production by electrolysis, in particular to an evaluation device for electrolysis hydrogen production alkali solution.

Background technique

Hydrogen is regarded as the most ideal energy carrier due to its green, low-carbon, high-efficiency, storable and transportable advantages. Using wind power, photovoltaics and other renewable energy sources to produce hydrogen by electrolysis of water is one of the most important ways of producing hydrogen in the future. At present, the hydrogen production technologies of water electrolysis mainly include alkaline water electrolysis hydrogen production, solid polymer electrolysis water hydrogen production and solid oxide water electrolysis hydrogen production. The scale of the equipment is relatively large, so it is currently the main technology used for hydrogen production by electrolysis of water.

The electrolyte for hydrogen production from alkaline electrolyzed water usually uses 30% potassium hydroxide. The temperature of the lye solution during operation reaches 70-90 °C. Long-term operation will cause certain corrosion to the plates and pipelines, which will affect the equipment on the one hand. On the other hand, due to the impurities brought into the lye, the properties are changed, which affects the electrolytic reaction process of the lye. At present, there is no detection and evaluation method for electrolytic hydrogen production lye. In the industrial production process, the density of lye is usually monitored to properly supplement the lost alkali. The impact has not been noted. The detection and evaluation of the lye properties alone is of great help in analyzing the operating state of the electrolytic hydrogen production system, adjusting the system parameters in a targeted manner, and operating and maintaining.

Utility model content

The purpose of the utility model is to provide an evaluation device for electrolytic hydrogen production alkali solution, which solves the problem that the properties of the alkali solution cannot be quantitatively evaluated during the operation of the existing industrial electrolysis hydrogen production system.

The utility model is realized through the following technical solutions:

An evaluation device for electrolyzing hydrogen lye, comprising a simulated electrolytic cell, a cathode lye storage tank, a cathode lye circulating pump, an anode lye storage tank, an anode lye circulating pump and a DC power supply;

The simulated electrolytic cell includes a cathode plate, a cathode mesh, a diaphragm, an anode mesh and an anode plate which are connected in sequence, and the cathode plate and the anode plate are both provided with an lye outlet and an lye inlet;

The inlet of the cathode lye storage tank is connected with the lye outlet of the cathode plate, and the outlet of the cathode lye storage tank is connected with the lye inlet of the cathode plate through the cathode lye circulating pump;

The inlet of the anode lye storage tank is connected with the lye outlet of the anode plate, and the outlet of the anode lye storage tank is connected with the lye inlet of the anode plate through the anode lye circulating pump;

A negative terminal is arranged on the top of the cathode plate, and a positive terminal is arranged on the top of the anode plate; Operating Voltage.

Further, a groove is formed in the middle of the cathode plate, a plurality of protrusions are arranged inside the groove, and the cathode mesh is installed in the groove.

Further, a groove is formed in the middle of the anode plate, a plurality of protrusions are arranged inside the groove, and the anode mesh is installed in the groove.

Further, the height of the protrusion is lower than the edge of the groove.

Further, the lye inlet is arranged on the lower side of the anode plate and the cathode plate, and the lye outlet is arranged on the upper side of the anode plate and the cathode plate.

Further, bolt holes are formed around the cathode plate and the anode plate, and the cathode plate and the anode plate are fixedly connected by bolts.

Further, the cathode mesh and the anode mesh are rectangular nickel meshes.

Further, the material of the middle of the diaphragm is polyphenylene sulfide woven cloth, and the material of the surrounding is polytetrafluoroethylene.

Compared with the prior art, the utility model has the following beneficial technical effects:

The utility model discloses an evaluation device for electrolyzing hydrogen-producing lye, which comprises a simulated electrolytic cell, a lye storage tank, an lye circulating pump and a direct current power supply, and newly prepared lye and waste lye are respectively placed in the lye storage tank. Circulate in the tank, and at the same time turn on the DC power supply for electrolytic hydrogen production. By comparing the stabilized voltage value, etc., the electrochemical properties of the alkaline electrolyte can be detected offline, simulating the real process of alkaline electrolysis hydrogen production. It fully reflects the actual working characteristics of the electrolyte, and at the same time, the sampling amount is small in the detection process, the cycle is short, and the operation is simple. The device of the utility model can quantitatively evaluate the influence of the electrolyte on the actual electrolysis process, and judge whether the alkali solution needs to be replaced, which makes up for the problem that the properties of the alkali solution cannot be quantitatively evaluated during the operation of the existing industrial electrolysis hydrogen production system. Industrial application has practical guiding significance; the device has a simple structure and is easy to popularize and apply.

Description of drawings

Fig. 1 is the structural representation of the evaluation device of a kind of electrolytic hydrogen production alkali solution of the present utility model;

FIG. 2 is a schematic structural diagram of a simulated electrolytic cell of the present invention.

Wherein, 1 is a simulated electrolytic cell, 2 is a cathode lye storage tank, 3 is a cathode lye circulating pump, 4 is an anode lye storage tank, 5 is an anode lye circulating pump, and 6 is a DC power supply;

11 is a cathode plate, 12 is a cathode mesh, 13 is a diaphragm, 14 is an anode mesh, 15 is an anode plate, 16 is a negative terminal, and 17 is a positive terminal.

Detailed ways

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the implementations. example.

As shown in Figure 1, the utility model discloses an evaluation device for electrolysis of hydrogen-producing lye, including a simulated electrolytic cell 1, a cathode lye storage tank 2, a cathode lye circulating pump 3, an anode lye storage tank 4, an anode lye The lye circulating pump 5 and the direct current power supply 6, the cathode lye storage tank 2 and the cathode lye circulating pump 3 are arranged on the cathode side of the simulated electrolytic cell 1, and the anode lye storage tank 4 and the anode lye circulating pump 5 are arranged on the simulated electrolysis cell. Anode side of cell 1.

As shown in FIG. 2, the simulated electrolytic cell 1 includes a cathode plate 11, a cathode mesh 12, a diaphragm 13, an anode mesh 14 and an anode plate 15 which are connected in sequence. The upper side of the cathode plate 11 and the anode plate 15 is provided with an outlet for lye, There is an lye inlet on the lower side.

As shown in Figure 1, the inlet of the cathode lye storage tank 2 is connected with the lye outlet of the cathode plate 11, and the outlet of the cathode lye storage tank 2 is connected with the inlet of the cathode lye circulating pump 3; The outlet is connected to the lye inlet of the cathode plate 11;

The inlet of the anode lye storage tank 4 is connected with the lye outlet of the anode plate 15, the outlet of the anode lye storage tank 4 is connected with the inlet of the anode lye circulating pump 5, and the outlet of the anode lye circulating pump 5 is connected with the outlet of the anode plate 15. The lye inlet is connected.

The top of the cathode plate 11 is provided with a negative terminal 16, and the top of the anode plate 15 is provided with a positive terminal 17; The operating voltage between the cathode plate 11 and the anode plate 15 is monitored.

Specifically, the middle of the cathode plate 11 and the anode plate 15 is a rectangular groove, the inside of the groove is a cylindrical protrusion, the height of the cylindrical protrusion is lower than the edge of the groove, and the height difference is equal to the thickness of the cathode mesh 12 and the anode mesh 14 .

The lye outlet and the lye inlet are arranged around the groove.

The cathode plate 11 and the anode plate 15 are provided with bolt holes around them, and the cathode plate 11 and the anode plate 15 are fixedly connected by bolts.

The cathode mesh 12 and the anode mesh 14 are rectangular nickel meshes, and the size of the nickel mesh is the same as that of the rectangular groove in the middle of the cathode plate 11 and the anode plate 15;

More preferably, the diaphragm 13 is composed of two parts, the middle part is made of polyphenylene sulfide woven cloth, and the surrounding part is made of polytetrafluoroethylene plastic.

The use method of the evaluation device for the electrolytic hydrogen production alkali solution, the method is realized by using the system, and the method comprises the following steps:

1) prepare potassium hydroxide solution, be placed in cathode lye storage tank 2 and anode lye storage tank 4 respectively;

2) Open the cathode lye circulating pump 3 and the anode lye circulating pump 5, the lye in the cathode lye storage tank 2 flows in by the lye inlet of the cathode plate 11, and after electrolysis in the simulated electrolytic cell 1, by the cathode plate 11 At the same time, the lye of the anode lye storage tank 4 flows in from the lye inlet of the anode plate 15, and after electrolysis in the simulated electrolytic cell 1, the lye of the anode plate 15 The liquid outlet flows back to the anode lye storage tank 4;

3) Start the DC power supply 6, adjust the current density to the set value, and start the hydrogen production process;

4) Monitor the change of voltage with time, after the voltage is stable, continue to react for 10min, and record the average value VF1 of the voltage within 10min;

5) Turn off the DC power supply 6 and the lye circulating pump, discharge the lye in the cathode lye storage tank 2 and the anode lye storage tank 4, and replace it with pure water;

6) Turn on the cathode lye circulating pump 3 and the anode lye circulating pump 5, rinse the electrolytic cell and the pipeline, and repeat the pure water cleaning process until the pH of the aqueous solution is 7-8;

7) The pure water in the cathode lye storage tank 2 and the anode lye storage tank 4 is discharged and replaced with the waste lye obtained from the industrial alkaline electrolyzer;

8) open the cathode alkali liquor circulation pump 3 and the anode alkali liquor circulation pump 5, open the DC power supply 6, adjust the current density to the set value, and start the hydrogen production process;

9) The DC power supply 6 monitors the change of the voltage with time in real time, after the voltage is stable, continue to react for 10min, and record the average value VF2 of the voltage within 10min;

10) Calculate VF2/VF1. When VF2/VF1 ≥ 1.1, it indicates that the lye is continued to be used for hydrogen production, and the energy consumption increases significantly, and the lye of the hydrogen production system needs to be replaced; when VF2/VF1 < 1.1, it indicates that the production The lye of the hydrogen system can also be used normally.

In step 1), the concentration of the alkali solution is the same as the concentration of the initial alkali solution in the industrial alkaline electrolytic cell in step 7), and the mass concentration of potassium hydroxide is 20%-30%.

The current density of step 3) and step 8) are the same, and the current density is 50 mA/cm ² -200 mA/cm ² .

In step 4) and step 9), when the voltage is stable, the voltage change value is less than or equal to 5mV/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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