A dechlorination device for reinforced concrete

Abstract

This invention provides a dechlorination device for reinforced concrete, comprising an electrolyte solution storage component, an electrolyte solution discharge component, and a liquid level control component. The electrolyte solution storage component includes a storage container and an anode, with the open end of the storage container connected to the reinforced concrete to be treated. An electrolyte solution is placed inside the storage container, and the electrolyte solution contacts the anode and the reinforcing steel bars in the reinforced concrete. The electrolyte solution discharge component includes a discharge pipe, a valve, and a transparent pipe. The liquid level control component includes a storage tank, a water pump, and a liquid delivery pipe. This invention applies electrochemical principles to reduce the chloride ion content in the concrete structure, increase the pH value near the reinforcing steel bars, prevent the generation of corrosion currents, restore the passivation protection of the reinforcing steel bars, and allows for flexible installation and disassembly without affecting the concrete structure. It is convenient to construct and fundamentally delays and controls the aging of concrete structures in in-service nuclear power plants in marine environments.

Description

Technical Field

[0001] This utility model belongs to the field of electrochemical repair technology of reinforced concrete, and specifically relates to a dechlorination device for reinforced concrete. Background Technology

[0002] Many nuclear power plants in China have been operating continuously for over a decade, with some units even reaching their 30-year design life. Under the long-term influence of the marine climate, the exposed concrete structures of nuclear power plants generally face material aging problems caused by chloride ion corrosion. Facilities such as PX seawater pump houses, which are constantly exposed to harsh environments of high temperature, high humidity, and high salt spray, exhibit even more significant aging of their concrete structures. Currently, many concrete components have shown discrete cracking and spalling due to internal steel reinforcement corrosion, seriously affecting the durability and safety performance of the structure. Over time, chloride ions continue to penetrate the concrete, accelerating the destruction of the passivation film on the steel reinforcement, further leading to volume expansion and cracking risks, posing a potential threat to the long-term safe operation of nuclear power plants.

[0003] Therefore, conducting systematic aging tests and health diagnoses on existing concrete structures, and implementing efficient and comprehensive dechlorination measures, has become an urgent task to ensure the structural integrity of nuclear power plants and extend their service life. To address this need, this invention proposes a dechlorination device for reinforced concrete, aiming to fundamentally inhibit chloride ion corrosion, repair aging structures, and improve concrete durability, thereby providing key technical support for the safe and stable operation of nuclear power plants. Summary of the Invention

[0004] In order to overcome the problems of the existing technology, this utility model provides a dechlorination device for reinforced concrete. Through an electrochemical reaction, chloride ions are formed at the anode to form chlorine gas that leaks out or dissolves in the electrolyte, thereby removing chloride ions from the concrete structure, increasing the pH value near the steel bars, and restoring the steel bars to a passivated state.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This utility model provides a dechlorination device for reinforced concrete, including an electrolyte solution storage component and an electrolyte solution discharge component. The electrolyte solution storage component includes a storage container and an anode. The storage container has an opening, and the opening end of the storage container is connected to the reinforced concrete to be treated. The anode is disposed inside the storage container. The storage container contains an electrolyte solution, which contacts the anode and the reinforcing steel bars in the reinforced concrete to be treated. The electrolyte solution discharge component includes a discharge pipe, a valve, and a transparent pipe. The discharge pipe is disposed at the bottom of the side wall of the storage container and communicates with the storage container. The valve is installed on the discharge pipe. The transparent pipe communicates with the discharge pipe and is vertically arranged between the storage container and the valve.

[0007] Furthermore, a T-joint and a silicone tube are also provided; the discharge pipe has a two-section structure, which is connected to two ports of the T-joint respectively, and the third port of the T-joint is connected to the transparent tube through the silicone tube.

[0008] Furthermore, the outer wall of the transparent tube is provided with scale lines for indicating the electrolyte level in the storage container.

[0009] Furthermore, a liquid level control component is also provided; the liquid level control component includes a liquid storage tank, a water pump, and a liquid delivery pipe; the liquid storage tank is located outside the storage container, and an electrolyte solution is placed inside the liquid storage tank; one end of the liquid delivery pipe is located below the liquid level inside the liquid storage tank, and the other end is located inside the storage container; the water pump is installed on the liquid delivery pipe to provide power for the delivery of the electrolyte solution.

[0010] Furthermore, a level gauge and a level controller are also provided; the level gauge is installed inside the storage container, and the level controller is electrically connected to the level gauge and the water pump respectively via wires.

[0011] Furthermore, the inner wall of the storage container is covered with a waterproof membrane, and the anode is disposed on the surface of the waterproof membrane.

[0012] Furthermore, the anode is a metal mesh structure; or the anode is a metal plate structure with a plurality of through holes arranged in an array.

[0013] Furthermore, the storage container has a cuboid structure with an open top surface and one side surface; the storage container is made of wood and / or plastic.

[0014] Furthermore, a flexible rubber sealing strip is provided at the connection between the storage container and the reinforced concrete to be treated.

[0015] Furthermore, after the storage container is connected to the reinforced concrete to be treated, the inner and / or outer sides of the connection between the storage container and the reinforced concrete to be treated are filled with sealant.

[0016] The beneficial effects of this utility model are:

[0017] (1) This utility model applies the principle of electrochemistry, uses the steel bars in the concrete as the cathode and the metal mesh or metal plate as the anode, and applies a regulated DC current. Through electrochemical reaction, it can reduce the chloride ion content in the concrete structure, increase the pH value near the steel bars, avoid the generation of corrosion current, restore the passivation protection of the steel bars, and fundamentally delay and control the aging problem of the concrete structure of the nuclear power plant in service in the marine environment.

[0018] (2) The present invention is equipped with a discharge pipe and a valve, which can be used to discharge the electrolyte solution after the application is completed, and can also be used to take samples multiple times at regular intervals to determine the chloride ion concentration in the electrolyte solution, thereby determining whether the electrolyte solution needs to be replaced, so as to avoid the electrolyte solution from becoming saturated and failing, thus affecting the dechlorination effect.

[0019] (3) The present invention is provided with a transparent tube connected to the storage container, and the outer wall of the transparent tube is provided with a scale line for marking the height of the electrolyte liquid level in the storage container. The liquid level of the electrolyte solution in the storage container can be obtained in real time by reading the scale line. When the electrolyte solution decreases after multiple samplings and is insufficient to cover the area to be treated, it can be observed in time so as to facilitate the replenishment of the electrolyte solution.

[0020] (4) This utility model is equipped with a storage tank, a water pump and a liquid delivery pipe. When the electrolyte solution inside the storage container is insufficient to cover the area to be treated, the water pump can be turned on, and the electrolyte solution in the storage tank can flow into the storage container through the liquid delivery pipe, which is convenient for replenishing the electrolyte solution.

[0021] (5) This utility model has a simple structure, is flexible in installation and disassembly, will not affect the concrete structure, is easy to construct and has strong practicality. Attached image description:

[0022] Figure 1 This is a schematic diagram of the structure of this utility model in use;

[0023] Figure 2 This is a cross-sectional view of the utility model;

[0024] The labels in the attached diagram are:

[0025] 1. Electrolyte solution storage assembly; 11. Storage container; 12. Waterproof membrane; 13. Anode; 14. Flexible rubber sealing strip; 15. Sealant; 2. Electrolyte solution discharge assembly; 21. Discharge pipe; 22. T-joint; 23. Valve; 24. Transparent tube; 25. Silicone tube; 3. Liquid level control assembly; 31. Storage tank; 32. Water pump; 33. Liquid delivery pipe; 34. Liquid level controller; 35. Liquid level gauge; 36. Wire. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0027] like Figures 1-2 As shown, this utility model provides a dechlorination device for reinforced concrete, including an electrolyte solution storage component 1 and an electrolyte solution discharge component 2.

[0028] The electrolyte solution storage assembly 1 includes a storage container 11 and an anode 13.

[0029] Storage container 11 is used to store the electrolyte solution and is made of wood and / or plastic. Storage container 11 has a cuboid structure with an open top and one open side. The open end of the side of storage container 11 is connected to the reinforced concrete to be treated, and a flexible rubber sealing strip 14 is provided at the connection between storage container 11 and the reinforced concrete to ensure airtightness. Anode 13 is fixedly disposed inside storage container 11. The electrolyte solution inside storage container 11 is in contact with anode 13 and the reinforcing steel in the reinforced concrete to be treated. Anode 13 and the reinforcing steel in the reinforced concrete to be treated are respectively connected to the positive and negative terminals of a DC power supply.

[0030] In a preferred embodiment of the present invention, a waterproof membrane 12 is laid and pasted on the inner wall of the storage container 11, and an anode 13 is disposed on the surface of the waterproof membrane 12. The anode 13 is a metal mesh structure, or the anode 13 is a metal plate structure with a plurality of arrayed distributed through holes.

[0031] In a preferred embodiment of this utility model, the anode 13 is set with the same area as the area to be removed from chloride ions. 3-5 lead wires are evenly welded on the anode 13 and bundled together with copper wire lugs to form an anode terminal. The polarization potential difference between any two lead wires is controlled within ±300mV to ensure uniform power density.

[0032] The electrolyte solution discharge assembly 2 includes a discharge pipe 21 (φ20 PVC pipe), a valve 23 (DN20 ball valve), and a transparent pipe 24 (φ20 transparent acrylic pipe). The discharge pipe 21 is located at the bottom of the side wall of the storage container 11 and is horizontally distributed, communicating with the storage container 11. The valve 23 is installed on the discharge pipe 21. The transparent pipe 24 communicates with the discharge pipe 21 and is vertically arranged, distributed between the storage container 11 and the valve 23. The valve 23 and the discharge pipe 21 are used for two purposes: firstly, to discharge the electrolyte solution after use; and secondly, to take samples periodically and repeatedly to determine the chloride ion concentration in the electrolyte solution, thereby determining whether the electrolyte solution needs to be replaced. Since the transparent tube 24 is connected to the storage container 11 through the discharge tube 21, the liquid level of the transparent tube 24 and the storage container 11 are the same. The outer wall of the transparent tube 24 is provided with a scale line for marking the electrolyte liquid level in the storage container 11. The liquid level of the electrolyte solution in the storage container 11 can be obtained in real time by reading the scale line. When the electrolyte solution decreases after multiple samplings and is insufficient to cover the area to be treated, the electrolyte solution needs to be replenished.

[0033] As a further preferred embodiment of this invention, the electrolyte solution discharge assembly 2 further includes a three-way pipe 22 (equal diameter tee) and a silicone tube 25. The discharge pipe 21 has a two-section structure, with the three-way pipe 22 positioned between the two sections; the two ends of the first section are respectively connected to the storage container 11 and one interface of the three-way pipe 22; one end of the second section is connected to the other interface of the three-way pipe 22, and the other end of the second section is an open end, with a valve 23 installed on the discharge pipe 21 of the second section. The third interface of the three-way pipe 22 is connected to the transparent tube 24 via the silicone tube 25.

[0034] As a further preferred embodiment of this invention, a liquid level control component 3 is also provided. The liquid level control component 3 includes a storage tank 31, a water pump 32, and a liquid delivery pipe 33. The storage tank 31 is located outside the storage container 11, and contains an electrolyte solution. One end of the liquid delivery pipe 33 is below the liquid level in the storage tank 31, and the other end is located inside the storage container 11. The water pump 32 is mounted on the liquid delivery pipe 33 to provide power for the delivery of the electrolyte solution. When the electrolyte solution inside the storage container 11 is insufficient to cover the area to be treated, the water pump 32 is activated, and the electrolyte solution in the storage tank 31 flows into the storage container 11 through the liquid delivery pipe 33 to replenish the electrolyte solution.

[0035] As a further preferred embodiment of this invention, a level gauge 35 (metal probe or level sensor) and a level controller 34 are also provided. The level gauge 35 is disposed inside the storage container 11 and is used to sense changes in the level of the electrolyte solution within the storage container 11. The level controller 34 is wirelessly connected to the level gauge 35 and the water pump 32, or electrically connected to the level gauge 35 and the water pump 32 via wires 36 respectively. When the level of the electrolyte solution in the storage container 11 falls below a set value, the level controller 34 controls the water pump 32 to add electrolyte to the storage container 11.

[0036] The principle and application process of this utility model:

[0037] Remove oil stains, coatings, and other coverings from the surface of the reinforced concrete structure to be treated, opening up the inherent micropores of the concrete structure. Connect the open end of the storage container 11, which contains the anode 13, to the reinforced concrete to be treated, and fill the inner and / or outer sides of the connection between the storage container 11 and the reinforced concrete with sealant 15. To verify the water tightness of the system, conduct a 36-48 hour water storage test 24 hours after system installation, using tap water. After successful verification, fill the storage container 11 with an electrolyte solution to perform the dechlorination operation. The electrolyte solution is a mixture of supersaturated Ca(OH)2 solution and 0.1 mol / L Li2CO3 solution.

[0038] This invention applies the principle of electrochemistry, using the steel bars in the concrete as the cathode and the metal mesh or metal plate as the anode. A regulated direct current is applied, and through the electrochemical reaction, chloride ions are formed into chlorine gas at the anode and leak out or dissolve in the electrolyte solution, thereby removing chloride ions from the concrete structure. The pH value near the steel bars increases, and the steel bars are restored to a passivated state.

[0039] During the electrochemical reaction, the electrolyte solution is sampled multiple times through valve 23 and discharge pipe 21 to analyze the chloride ion concentration, thereby determining whether the electrolyte solution is saturated and ineffective, and thus whether it needs to be replaced. During this process, the liquid level of the electrolyte solution in storage container 11 can be obtained in real time through the scale reading on transparent tube 24. When multiple samplings result in a decrease in electrolyte solution that is insufficient to cover the area to be treated, replenishment of the electrolyte solution is required. When replenishment is needed, water pump 32 is activated, and the electrolyte solution in storage tank 31 flows into storage container 11 through liquid delivery pipe 33, thus replenishing the electrolyte solution.

[0040] After the reaction is complete, valve 23 is opened, and the electrolyte solution inside storage container 11 is discharged through discharge pipe 21, thus disassembling and separating the device from the treated reinforced concrete structure.

[0041] The above are merely preferred embodiments of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are within its protection scope. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should be considered within its protection scope.

Claims

1. A dechlorination device for reinforced concrete, characterized in that, It includes an electrolyte solution storage component (1) and an electrolyte solution discharge component (2); The electrolyte solution storage assembly (1) includes a storage container (11) and an anode (13); the storage container (11) has an opening, and the opening end of the storage container (11) is connected to the reinforced concrete to be treated; the anode (13) is disposed inside the storage container (11); the storage container (11) contains an electrolyte solution, and the electrolyte solution is in contact with the anode (13) and the reinforcing steel in the reinforced concrete to be treated; The electrolyte solution discharge assembly (2) includes a discharge pipe (21), a valve (23), and a transparent pipe (24); the discharge pipe (21) is located at the bottom of the side wall of the storage container (11) and communicates with the storage container (11); the valve (23) is installed on the discharge pipe (21); the transparent pipe (24) communicates with the discharge pipe (21) and is vertically arranged between the storage container (11) and the valve (23).

2. The dechlorination device for reinforced concrete according to claim 1, characterized in that, It is also equipped with a tee pipe (22) and a silicone tube (25); The discharge pipe (21) has a two-section structure and is connected to two interfaces of the three-way pipe (22). The third interface of the three-way pipe (22) is connected to the transparent pipe (24) through the silicone tube (25).

3. The dechlorination device for reinforced concrete according to claim 1, characterized in that, The outer wall of the transparent tube (24) is provided with scale lines for marking the electrolyte level in the storage container (11).

4. The dechlorination device for reinforced concrete according to claim 1, characterized in that, It is also equipped with a liquid level control component (3); The liquid level control component (3) includes a liquid storage tank (31), a water pump (32), and a liquid delivery pipe (33); The storage tank (31) is located outside the storage container (11), and the storage tank (31) contains an electrolyte solution. One end of the liquid delivery pipe (33) is located below the liquid level in the storage tank (31), and the other end is located inside the storage container (11). The water pump (32) is installed on the liquid delivery pipe (33) to provide power for the delivery of the electrolyte solution.

5. The dechlorination device for reinforced concrete according to claim 4, characterized in that, It is also equipped with a level gauge (35) and a level controller (34); The level gauge (35) is installed inside the storage container (11), and the level controller (34) is electrically connected to the level gauge (35) and the water pump (32) via wires (36).

6. The dechlorination device for reinforced concrete according to claim 1, characterized in that, The inner wall of the storage container (11) is covered with a waterproof membrane (12), and the anode (13) is disposed on the surface of the waterproof membrane (12).

7. The dechlorination device for reinforced concrete according to claim 1, characterized in that, The anode (13) is a metal mesh structure; Alternatively, the anode (13) may be a metal plate structure with several through holes arranged in an array.

8. The dechlorination device for reinforced concrete according to claim 1, characterized in that, The storage container (11) has a cuboid structure with an open top surface and one side surface. The storage container (11) is made of wood and / or plastic.

9. The dechlorination device for reinforced concrete according to claim 1, characterized in that, A flexible rubber sealing strip (14) is provided at the connection between the storage container (11) and the reinforced concrete to be treated.

10. The dechlorination device for reinforced concrete according to claim 1, characterized in that, After the storage container (11) is connected to the reinforced concrete to be treated, the inner and / or outer sides of the connection between the storage container (11) and the reinforced concrete to be treated are filled with sealant (15).

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