A chlorine gas absorption device for hydrogen-chlorine battery testing and a method of using the same

Abstract

The present invention discloses a chlorine gas absorption device for hydrogen-chlorine battery testing and a method for using the same. The chlorine gas absorption device includes a hydrogen storage tank, an inert gas tank, a main tank and a sub-tank; the bottom of the main tank is connected to the battery stack through a pipeline, and the top of the main tank is connected to the inert gas tank through a pipeline; a delivery pump is provided on each pipeline, and the flow of liquid in the corresponding pipeline can be blocked when the delivery pump is closed; the main tank is at least used to accommodate an acidic FeCl2 solution, and an exchange component is provided in the main tank, and the space above the exchange component of the main tank is connected to the sub-tank through a pipeline; 0-valent iron is provided in the exchange component, and the exchange component has a water-permeable structure. The method of use of the present invention includes exchanging liquids in the main tank and the sub-tank, and adding different solutions into the sub-tank. The chlorine gas absorption device for hydrogen-chlorine battery testing provided by the present invention has the effect of maintaining the rate at which the liquid in the main tank absorbs chlorine and not being easy to crystallize.

Description

Technical Field

[0001] The present invention belongs to the technical field of batteries, and in particular, relates to a chlorine gas absorption device for hydrogen-chlorine battery testing and a use method thereof. Background Art

[0002] Hydrogen-chlorine battery is a green and pollution-free energy technology. In the electrochemical reaction process, hydrogen and chlorine are converted into electrical energy and hydrogen chloride (HCl). Hydrogen-chlorine battery, as an energy conversion device based on the chemical reaction of hydrogen and chlorine, has many significant uses and advantages:

[0003] ① Chlorine has a high redox potential and high theoretical specific capacity. Hydrogen-chlorine batteries have a high theoretical energy density and can provide high-energy-density electrical energy output, which gives them unique advantages in application scenarios that require high energy density, such as aerospace, deep-sea exploration, data centers, energy-saving lighting systems, and high-end electronic products. In these occasions, hydrogen-chlorine batteries can quickly meet large amounts of power demand and ensure the stable operation of equipment or systems;

[0004] ②Cl2 / Cl in hydrogen-chlorine batteries - The redox couple has fast electrochemical kinetics, which means that hydrogen-chloride batteries can respond quickly to changes in current and voltage. Compared with traditional rechargeable batteries, hydrogen-chloride batteries take less time to charge and can return to full charge more quickly;

[0005] ③ Hydrogen and chlorine are both highly active gases, which makes hydrogen-chlorine batteries exhibit good electrochemical performance both at room temperature and under ultra-low temperature conditions.

[0006] During the discharge process of hydrogen-chlorine batteries, hydrogen undergoes an oxidation reaction at the anode to generate hydrogen ions and electrons; chlorine undergoes a reduction reaction at the cathode, combining with hydrogen ions and electrons to generate chloride ions; during the charging process, hydrogen ions are reduced to hydrogen through an external power source, and chloride ions are re-oxidized to chlorine. This process will produce a large amount of chlorine, which is highly oxidizing and corrosive and needs to be dealt with in a timely manner.

[0007] In scientific research experiments related to hydrogen-chlorine batteries, in order to study the performance and reaction mechanism of hydrogen-chlorine batteries, it may be necessary to accurately control the amount of chlorine gas generated during charging and collect and analyze it. However, in most cases, for the safety and environmental protection of the experiment, the chlorine gas still needs to be absorbed instead of directly collected and stored, and the chlorine gas needs to be blown out of the battery stack in time through inert gas.

[0008] At present, chlorine is usually absorbed by alkali solution in laboratories. Alkali solution (such as sodium hydroxide, calcium hydroxide, etc.) reacts quickly with chlorine and can absorb a large amount of chlorine in a short time.

[0009] However, the method of using alkali solution to absorb chlorine has the following disadvantages:

[0010] ① The salts generated during the chlorine absorption process are prone to crystallization and blockage of equipment;

[0011] ②Alkali solution is corrosive and has strict requirements on equipment materials, which increases the difficulty and cost of equipment material selection;

[0012] ③ The products after the reaction of alkali solution and chlorine gas often have little application value and are usually difficult to regenerate directly;

[0013] ④ There is an upper limit to the solute concentration in the alkali solution, which means that the total volume of alkali solution required is large, and the configuration and storage of the alkali solution are difficult;

[0014] ⑤ During the process of alkali solution absorbing chlorine, the solute concentration changes greatly, which affects the stability of the chlorine absorption rate of the alkali solution. There is a risk that chlorine cannot be completely absorbed and leaks. Summary of the invention

[0015] In view of the deficiencies in the prior art, an object of the present invention is to provide a chlorine gas absorption device for hydrogen-chlorine battery testing.

[0016] In order to achieve the above-mentioned invention object, the technical solution adopted by the present invention includes:

[0017] In one aspect, a chlorine gas absorption device for hydrogen-chlorine battery testing includes a hydrogen storage tank and an inert gas tank, both of which are connected to a battery stack through a pipeline, and further includes: a main tank and a secondary tank;

[0018] The bottom of the main tank is connected to the battery stack through a pipeline. The main tank is at least used to receive chlorine and inert gas released from the battery stack. The top of the main tank is connected to the inert gas tank through a pipeline. Each of the pipelines is provided with a delivery pump, which can block the flow of liquid in the corresponding pipeline when it is turned off.

[0019] The main tank is used to contain at least an acidic FeCl2 solution, an exchange component is arranged in the main tank, and the bottom of the main tank is connected with the sub-tank through a pipeline; zero-valent iron is arranged in the exchange component, and the exchange component has a water-permeable structure so that liquid can be immersed in the exchange component and the liquid can contact the zero-valent iron.

[0020] Preferably, the space of the main tank above the exchange component is connected to the auxiliary tank through a pipeline.

[0021] In the present invention, the solution in the main tank is transported from the bottom of the auxiliary tank to the auxiliary tank, and the solution in the auxiliary tank is transported from the top of the main tank to the main tank, so that the solutions in the main tank and the auxiliary tank can circulate in one direction in the main tank and the auxiliary tank system, so that the solutions can actively flow and contact the exchange components, thereby improving the Fe 3+ The reaction rate with the zero-valent iron in the exchange component is beneficial to maintaining the rate at which the liquid in the main tank absorbs chlorine.

[0022] Preferably, the bottom of the main tank is connected to the bottom of the inert gas tank through a pipeline.

[0023] In the present invention, chlorine in the inert gas can be removed by transporting the gas in the main tank back to the inert gas tank from the top of the main tank and inputting the inert gas in the inert gas tank into the main tank from the bottom of the main tank.

[0024] In the present invention, the inert gas is specifically selected from nitrogen, and helium and neon can also be selected. Since the density of nitrogen is less than that of chlorine, chlorine tends to sink to the bottom in the inert gas tank. The inert gas in the inert gas tank is input into the main tank from the bottom of the inert gas tank, so that the chlorine in the inert gas tank can be discharged as much as possible, which is conducive to improving the effect of removing chlorine from nitrogen.

[0025] Preferably, the auxiliary tank is used to contain at least the acidic FeCl2 solution and the dilute hydrochloric acid, and the auxiliary tank is used to receive at least the liquid in the main tank.

[0026] Preferably, the pH of the acidic FeCl2 solution is ≤2.5.

[0027] In the present invention, when the pH in the main tank is ≤2.5, Fe 3+ Not prone to settling.

[0028] Preferably, the zero-valent iron is selected from one or more of elemental iron and iron alloy.

[0029] In the present invention, there are many sources of zero-valent iron, such as waste stainless steel, cutting iron chips, etc., which are relatively cheap. Taking sodium hydroxide as an example, when absorbing the same amount of chlorine, the cost of zero-valent iron is much lower than that of sodium hydroxide, and the application value of the obtained FeCl2 and FeCl3 is much higher than that of NaCl and NaClO.

[0030] On the other hand, a method for using a chlorine gas absorption device for hydrogen-chlorine battery testing comprises the following steps:

[0031] (1) Add acidic FeCl2 solution to the bottom of the main tank so that the liquid level of the acidic FeCl2 solution in the main tank is lower than the exchange component; add acidic FeCl2 solution to the auxiliary tank;

[0032] (2) The inert gas in the inert gas tank is input into the battery stack, the gas in the battery stack is input into the main tank, and the gas in the main tank is transported back to the inert gas tank from the top of the main tank;

[0033] (3) The battery stack begins to perform a charging experiment, and the acidic FeCl2 solution in the auxiliary tank is transferred into the main tank, so that the acidic FeCl2 solution in the main tank contacts the exchange components; the hydrogen generated by the battery stack is transferred into the hydrogen storage tank;

[0034] (4) After the battery stack charging experiment is completed, part of the mixed solution in the main tank is transferred to the auxiliary tank so that the solution level in the main tank is lower than the exchange component, and then all the transfer pumps are turned off.

[0035] Preferably, in step (3), before FeCl2 is precipitated from the solution in the main tank, part of the mixed solution in the main tank is transported to the auxiliary tank, and then the solution in the auxiliary tank is discharged, and then dilute hydrochloric acid or ferrous chloride solution or a mixed solution of dilute hydrochloric acid and ferrous chloride is added to the auxiliary tank, and finally the liquid in the auxiliary tank is transported to the main tank, so that the solution in the main tank contacts the exchange component.

[0036] Preferably, in step (3), when the FeCl3 content in the solution in the main tank is 0, part of the mixed solution in the main tank is transported into the auxiliary tank, so that the liquid level of the solution in the main tank decreases and is always in contact with the exchange component;

[0037] When the FeCl3 content in the main tank continues to increase, dilute hydrochloric acid or ferrous chloride solution or a mixed solution of dilute hydrochloric acid and ferrous chloride is added to the auxiliary tank, and finally the liquid in the auxiliary tank is input into the main tank to increase the liquid level of the solution in the main tank.

[0038] Compared with the prior art, the advantages of the present invention include:

[0039] (1) The present invention provides a chlorine gas absorption device for hydrogen-chlorine battery testing. By exchanging the liquid in the main tank and the auxiliary tank, the contact height between the solution in the main tank and the exchange component can be controlled, thereby controlling the contact height between the zero-valent iron and Fe in the exchange component. 3+ The reaction rate of Fe 3+ The concentration makes the Fe in the main tank 3+ The concentration is not 0;

[0040] (2) The chlorine gas absorption device for hydrogen-chlorine battery testing provided by the present invention can dilute the concentration of the solution in the main tank by exchanging the liquid in the main tank and the auxiliary tank and conveying dilute hydrochloric acid or ferrous chloride solution or a mixed solution of dilute hydrochloric acid and ferrous chloride to the main tank through the auxiliary tank, thereby preventing the solute in the main tank from crystallizing and facilitating the maintenance of the rate at which the liquid in the main tank absorbs chlorine gas;

[0041] (3) The present invention provides a chlorine gas absorption device for hydrogen-chlorine battery testing. After the gas in the battery stack is input into the main tank, the inert gas can be separated in the main tank, so that the inert gas can be recycled;

[0042] (4) The present invention provides a chlorine gas absorption device for hydrogen-chlorine battery testing. The gas in the battery stack is input into the main tank from the bottom of the main tank, which can accelerate the mixing of the solution in the main tank and is beneficial to the Fe 3+ Contact with zero-valent iron in the exchange component;

[0043] (5) The present invention provides a chlorine gas absorption device for hydrogen-chlorine battery testing. The gas in the battery stack is input into the main tank from the bottom of the main tank, which can take out the heat in the main tank and is conducive to reducing the temperature of the liquid in the main tank;

[0044] (6) The present invention provides a chlorine gas absorption device for hydrogen-chlorine battery testing, and the obtained product is a mixture of FeCl2 and FeCl3, which can be converted into FeCl2 with high application value by simple means; at the same time, the corrosiveness of the mixture of FeCl2 and FeCl3 is much less than that of alkaline solution, and the requirements for equipment materials are low. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0046] Figure 1 It is an overall schematic diagram of a chlorine gas absorption device for hydrogen-chlorine battery testing in the present invention;

[0047] Figure 2 The figure is a schematic diagram of the interior of a chlorine gas absorption device for hydrogen-chlorine battery testing in the present invention.

[0048] Reference numerals:

[0049] 11. Battery stack; 12. Hydrogen storage tank; 14. Inert gas tank; 15. Main tank; 16. Auxiliary tank; 17. Plywood; 18. Water-permeable cotton. DETAILED DESCRIPTION

[0050] In view of the deficiencies in the prior art, the inventor of this case has proposed the technical solution of the present invention after long-term research and extensive practice. The following will further explain the technical solution, its implementation process and principle, etc. in conjunction with the drawings in the embodiments of this application and specific implementation cases.

[0051] It should be noted that the embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention. The described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, the present invention covers any substitution, modification, equivalent method and scheme made on the spirit, principle and scope of the present invention defined by the claims. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] The embodiment of the present invention is intended to introduce and illustrate the structural composition of the chlorine gas absorption device for hydrogen-chlorine battery testing and the use method thereof, as well as the coordination relationship between the various components. Unless otherwise specified, the size, material and manufacturing process of each component in the chlorine gas absorption device suitable for hydrogen-chlorine battery testing in the embodiment of the present invention can be selected according to the specific situation and are not specifically limited or explained herein.

[0053] Further, in order to make the public have a better understanding of the present invention, some specific details are described in detail in the following detailed description of the present invention. For those skilled in the art, the present invention can be fully understood without the description of these details.

[0054] Example

[0055] See also Figure 1 and Figure 2 A chlorine gas absorption device for hydrogen-chlorine battery testing includes a hydrogen storage tank 12, an inert gas tank 14, a main tank 15 and a sub-tank 16. The main tank 15 is used to contain at least an acidic FeCl2 solution, and an exchange component is arranged in the main tank 15, and zero-valent iron is arranged in the exchange component. The exchange component has a water-permeable structure so that liquid can be immersed in the exchange component and the liquid can contact with the zero-valent iron.

[0056] Specifically, the hydrogen storage tank 12, the inert gas tank 14, the main tank 15 and the auxiliary tank 16 are all made of chlorine-resistant materials.

[0057] Preferably, the zero-valent iron is selected from one or more of elemental iron and iron alloys.

[0058] Specifically, the zero-valent iron in the present invention is cutting iron chips, which have many pores and a large surface area, which is beneficial to Fe 3+ Full contact with cutting chips.

[0059] Specifically, the exchange component includes two clamping plates 17, both of which are made of plastic, and are provided with a plurality of through holes. Both clamping plates 17 are fixedly connected to the inner wall of the main tank 15, and both sides of the two clamping plates 17 facing each other are provided with water-permeable cotton 18, which is used to intercept the cutting iron chips, and a receiving space for receiving the cutting iron chips is formed between the two water-permeable cottons 18.

[0060] In other embodiments, there may be multiple exchange components, and the multiple exchange components are distributed vertically.

[0061] Specifically, before the cutting iron chips are loaded into the receiving space, they need to be cleaned to remove the cutting fluid on the surface.

[0062] Preferably, the pH of the acidic FeCl2 solution is ≤ 2.5. In the present invention, under the environment of pH ≤ 2.5, both FeCl2 and FeCl3 are soluble, which is beneficial to reduce Fe 3+ of sedimentation.

[0063] The hydrogen storage tank 12 and the inert gas tank 14 are both connected to the battery stack 11 through pipelines. The hydrogen storage tank 12 is used to receive hydrogen generated by the battery stack 11, and the inert gas tank 14 is used to transport nitrogen to the battery stack 11 to blow out chlorine generated by the battery stack 11.

[0064] The bottom of the main tank 15 is connected to the battery stack 11 through a pipeline, and the main tank 15 is used to receive at least chlorine and inert gas released from the battery stack 11. The bottom of the main tank 15 is connected to the auxiliary tank 16 through a pipeline, and the top of the main tank 15 is connected to the inert gas tank 14 through a pipeline.

[0065] Specifically, after the chlorine and inert gas released from the battery stack 11 enter the main tank 15 , the chlorine is absorbed by the solution in the main tank 15 , and the nitrogen enters the inert gas tank 14 from the top of the main tank 15 .

[0066] Preferably, the auxiliary tank 16 is used to contain at least the acidic FeCl 2 solution and the dilute hydrochloric acid, and the auxiliary tank 16 is used to receive at least the liquid in the main tank 15 .

[0067] Specifically, the solution in the main tank 15 and the solution in the auxiliary tank 16 can be exchanged; by exchanging the solutions in the main tank 15 and the auxiliary tank 16, and adding dilute hydrochloric acid or ferrous chloride solution or a mixed solution of dilute hydrochloric acid and ferrous chloride into the auxiliary tank 16, the solution in the main tank 15 can be diluted and the liquid level in the main tank 15 can be controlled.

[0068] Preferably, the bottom of the main tank 15 is connected to the bottom of the inert gas tank 14 through a pipeline.

[0069] Specifically, by transferring the gas in the main tank 15 back to the inert gas tank 14 from the top of the main tank 15 and inputting the inert gas in the inert gas tank 14 into the main tank 15 from the bottom of the main tank 15, the nitrogen can be driven to circulate in the main tank 15 and the inert gas tank 14, so that the nitrogen can be cleaned by the solution in the main tank 15 and the chlorine in the nitrogen can be removed.

[0070] Specifically, in the present invention, when a large amount of chlorine is generated in a short period of time so that the main tank 15 cannot absorb it in time, or when the solution in the main tank 15 is diluted to control the temperature of the solution in the main tank 15, part of the chlorine will be discharged from the main tank 15 from the top of the main tank 15 along with the nitrogen. At this time, the inert gas tank 14 can temporarily accommodate the chlorine. After the chlorine generation rate is reduced, the nitrogen is driven to circulate in the main tank 15 and the inert gas tank 14 to remove the chlorine in the nitrogen.

[0071] Preferably, the space above the exchange component in the main tank 15 is connected to the auxiliary tank 16 through a pipeline.

[0072] Specifically, by transferring the solution in the main tank 15 from the bottom of the auxiliary tank 16 into the auxiliary tank 16, and by transferring the solution in the auxiliary tank 16 from the top of the main tank 15 into the main tank 15, when the solution in the main tank 15 has submerged the cutting iron chips but the FeCl3 concentration is still high, the solutions in the main tank 15 and the auxiliary tank 16 can circulate unidirectionally in the main tank 15 and the auxiliary tank 16 system, so that the solution can actively flow and contact the exchange components, thereby increasing the FeCl3 concentration. 3+ The reaction speed with the cutting iron chips is beneficial to maintaining the rate at which the liquid in the main tank 15 absorbs chlorine.

[0073] Specifically, by driving the solution to unidirectionally circulate in the main tank 15 and the auxiliary tank 16 and adding dilute hydrochloric acid or ferrous chloride solution or a mixed solution of dilute hydrochloric acid and ferrous chloride into the auxiliary tank 16, the concentration of the solution in the main tank 15 can be diluted without suspending the main tank 15 from absorbing chlorine, thereby maintaining the rate at which the liquid in the main tank 15 absorbs chlorine.

[0074] Preferably, each pipeline is provided with a delivery pump, which can block the flow of liquid in the corresponding pipeline when the delivery pump is turned off.

[0075] Specifically, in this embodiment, the delivery pump is a bidirectional gate pump. In other embodiments, a bidirectional pump and a valve may be used in combination.

[0076] The method for using the chlorine gas absorption device for hydrogen-chlorine battery testing includes the following steps:

[0077] (1) Adding FeCl2 solution with a pH value of ≤2.5 to the bottom of the main tank 15 so that the liquid level in the main tank 15 is lower than the cutting iron chips; adding FeCl2 solution with a pH value of ≤2.5 to the auxiliary tank 16;

[0078] (2) Start the corresponding two-way gate pump to input the inert gas in the inert gas tank 14 into the battery stack 11, input the gas in the battery stack 11 into the main tank 15, and transport the gas in the main tank 15 back to the inert gas tank 14 from the top of the main tank 15;

[0079] (3) The battery stack 11 starts the charging experiment, and the acidic FeCl2 solution in the auxiliary tank 16 is input into the main tank 15, so that the acidic FeCl2 solution in the main tank 15 contacts the cutting iron chips; the corresponding two-way gate pump is started to transport the hydrogen generated by the battery stack 11 into the hydrogen storage tank 12;

[0080] (3.1) When the FeCl3 content in the solution in the main tank 15 is less than 0.01 mol / L, the corresponding two-way gate pump is started to transfer part of the mixed solution in the main tank 15 into the auxiliary tank 16, so that the liquid level in the main tank 15 drops and is always in contact with the cutting iron chips, so that the FeCl3 content in the solution in the main tank 15 increases;

[0081] (3.2) When the FeCl3 concentration in the main tank 15 is greater than 0.08 mol / L and continues to increase, add dilute hydrochloric acid or ferrous chloride solution or a mixed solution of dilute hydrochloric acid and ferrous chloride into the auxiliary tank 16, and finally start the corresponding two-way gate pump to input the dilute hydrochloric acid in the auxiliary tank 16 into the main tank 15, so that the liquid level of the solution in the main tank 15 rises.

[0082] (3.3) Before FeCl2 precipitates from the solution in the main tank 15, 1 / 5 of the volume of the mixed solution in the main tank 15 is transferred to the auxiliary tank 16, and then the solution in the auxiliary tank 16 is discharged, and then dilute hydrochloric acid or ferrous chloride solution or a mixed solution of dilute hydrochloric acid and ferrous chloride is added to the auxiliary tank 16, and finally the corresponding two-way gate pump is started to transfer the dilute hydrochloric acid in the auxiliary tank 16 into the main tank 15, so that the solution in the main tank 15 contacts the cutting iron chips.

[0083] (4) After the charging experiment of the battery stack 11 is completed, the corresponding two-way gate pump is started to transfer part of the mixed solution in the main tank 15 into the auxiliary tank 16, so that the liquid level of the solution in the main tank 15 is lower than the cutting iron chips, and then all the transfer pumps are closed.

[0084] (5) After step (4) is completed, the corresponding two-way gate pump is started to transport the solution in the main tank 15 into the auxiliary tank 16 from the bottom of the auxiliary tank 16, and the solution in the auxiliary tank 16 is transported from the top of the main tank 15 into the main tank 15 to remove the chlorine in the nitrogen.

[0085] It should be understood that the above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it accordingly. It cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, some simple deductions or substitutions can be made without departing from the concept of the present invention. All equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. A chlorine gas absorption device for hydrogen-chlorine battery testing, comprising a hydrogen storage tank (12) and an inert gas tank (14), wherein the hydrogen storage tank (12) and the inert gas tank (14) are both connected to a battery stack (11) through a pipeline, characterized in that: Also includes: A main tank (15) and a secondary tank (16); The bottom of the main tank (15) is connected to the battery stack (11) through a pipeline. The main tank (15) is used to receive at least chlorine and inert gas released from the battery stack (11). The top of the main tank (15) is connected to the inert gas tank (14) through a pipeline. A delivery pump is provided on each of the pipelines. When the delivery pump is turned off, the flow of liquid in the corresponding pipeline can be blocked. The main tank (15) is at least used to contain an acidic FeCl2 solution. An exchange component is arranged in the main tank (15). The bottom of the main tank (15) is connected to the auxiliary tank (16) through a pipeline. Zero-valent iron is arranged in the exchange component. The exchange component has a water-permeable structure so that liquid can be immersed in the exchange component and the liquid can contact the zero-valent iron.

2. A chlorine gas absorption device for hydrogen-chlorine battery testing according to claim 1, characterized in that: The space of the main tank (15) above the exchange component is communicated with the auxiliary tank (16) through a pipeline.

3. A chlorine gas absorption device for hydrogen-chlorine battery testing according to claim 1, characterized in that: The bottom of the main tank (15) is connected to the bottom of the inert gas tank (14) through a pipeline.

4. A chlorine gas absorption device for hydrogen-chlorine battery testing according to claim 1, characterized in that: The auxiliary tank (16) is used at least to contain the acidic FeCl2 solution and the dilute hydrochloric acid, and the auxiliary tank (16) is used at least to receive the liquid in the main tank (15).

5. A chlorine gas absorption device for hydrogen-chlorine battery testing according to claim 1, characterized in that: The pH of the acidic FeCl2 solution is ≤2.

5.

6. A chlorine gas absorption device for hydrogen-chlorine battery testing according to claim 1, characterized in that: The zero-valent iron is selected from one or more of elemental iron and iron alloy.

7. A method for using the chlorine gas absorption device for hydrogen-chlorine battery testing as claimed in claim 1, characterized in that: The following steps are included: (1) Adding an acidic FeCl2 solution to the bottom of the main tank (15) so that the liquid level of the acidic FeCl2 solution in the main tank (15) is lower than the exchange component; adding an acidic FeCl2 solution to the auxiliary tank (16); (2) The inert gas in the inert gas tank (14) is input into the battery stack (11), the gas in the battery stack (11) is input into the main tank (15), and the gas in the main tank (15) is transported back to the inert gas tank (14) from the top of the main tank (15); (3) The battery stack (11) starts a charging experiment, and the acidic FeCl2 solution in the auxiliary tank (16) is input into the main tank (15), so that the acidic FeCl2 solution in the main tank (15) contacts the exchange component; the hydrogen generated by the battery stack (11) is transported into the hydrogen storage tank (12); (4) After the charging experiment of the battery stack (11) is completed, part of the mixed solution in the main tank (15) is transferred to the auxiliary tank (16) so that the liquid level of the solution in the main tank (15) is lower than the exchange component, and then all the transfer pumps are turned off.

8. The method of use according to claim 7, characterized in that: In the step (3), before FeCl2 is precipitated from the solution in the main tank (15), part of the mixed solution in the main tank (15) is transported to the auxiliary tank (16), then the solution in the auxiliary tank (16) is discharged, and then dilute hydrochloric acid or ferrous chloride solution or a mixed solution of dilute hydrochloric acid and ferrous chloride is added to the auxiliary tank (16), and finally the liquid in the auxiliary tank (16) is transported to the main tank (15), so that the solution in the main tank (15) contacts the exchange component.

9. The method of use according to claim 7, characterized in that: In the step (3), when the FeCl3 content in the solution in the main tank (15) is 0, part of the mixed solution in the main tank (15) is transported into the auxiliary tank (16), so that the liquid level of the solution in the main tank (15) decreases and is always in contact with the exchange component; When the FeCl3 content in the main tank (15) continues to increase, dilute hydrochloric acid or ferrous chloride solution or a mixed solution of dilute hydrochloric acid and ferrous chloride is added to the auxiliary tank (16), and finally the liquid in the auxiliary tank (16) is input into the main tank (15), so that the liquid level of the solution in the main tank (15) rises.

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