A high-efficiency electrochemical desalination method and device based on intermittent energization

A desalination device and electrochemical technology, applied in construction, building maintenance, building construction, etc., can solve the problems of reduced possibility of steel bars, low electrochemical desalination efficiency, increased power consumption, etc., to prevent corrosion and accelerate electromigration. , the effect of saving electricity

Active Publication Date: 2021-11-30
HOHAI UNIV
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Problems solved by technology

However, the above-mentioned devices and methods all adopt the method of continuous energization, which increases the consumption of electric energy. Secondly, when the desalination reaches a certain period of time, the chloride ions entering the electrolyte are easily affected by the concentration gradient and return to the depth of the concrete, resulting in electrochemical desalination. Less efficient; furthermore, although the concrete surrounding the rebar is more alkaline after re-alkalization, the re-alkalization process makes the surface of the rebar highly active and the rebar is less likely to enter repassivation

Method used

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  • A high-efficiency electrochemical desalination method and device based on intermittent energization
  • A high-efficiency electrochemical desalination method and device based on intermittent energization
  • A high-efficiency electrochemical desalination method and device based on intermittent energization

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Embodiment 1

[0043] Embodiment 1 High-efficiency electrochemical desalination device based on intermittent energization

[0044] A high-efficiency electrochemical desalination device based on intermittent energization, see figure 1 , including a concrete specimen 1, an anode 6, an electrolytic cell 3 filled with an electrolyte 4, and a DC power supply 7, the positive pole of the DC power supply 7 is electrically connected to the anode 6 through an anode lead, and the negative pole of the DC power supply 7 is electrically connected through a cathode lead. Connect the steel bars 5 in the concrete test piece 1 to form a current loop after electrification, the electrolyte 4 is in contact with the surface of the concrete test piece 1, and the anode 6 is parallel to the concrete surface and immersed in the electrolyte In 4, in order to prevent the electrolyte 4 from overflowing, the edge of the electrolytic cell 3 is provided with a waterproof glue 2 to seal the edge of the electrolytic cell 3 a...

Embodiment 2

[0046] Embodiment 2 High-efficiency electrochemical desalination method based on intermittent energization

[0047] A high-efficiency electrochemical desalination method based on intermittent energization, comprising the steps of:

[0048] S1, using the steel bar in the concrete specimen as the cathode, construct an electrochemical reaction system comprising an anode, an electrolyte and a DC power supply, the anode preferably uses a titanium wire mesh, and the electrolyte is saturated Ca(OH) 2 Solution, while passing into the concrete test piece 0.2mol / L desalination accelerator, the desalination accelerator is Na 2 HPO 4 ;

[0049] S2. After the electrolyte is heated for 10 minutes, the DC power supply is energized to carry out electrochemical reaction; when the electrolyte is heated to 50°C, it remains constant; the voltage of the DC power supply is 20V, and the applied current density is the total surface area of ​​the reinforcement mesh in the concrete Calculated as 2A / ...

Embodiment 3

[0053] Embodiment 3 The optimization of intermittent heating of electrolyte and intermittent energization cycle of DC power supply

[0054] The concrete specimens to be desalted were divided into 5 groups, and electrochemical desalination experiments were carried out under different intermittent heating and energization cycle conditions, and the intermittent energization cycle was delayed by 10 minutes compared with the intermittent heating cycle; the rest of the experimental conditions were the same as in Example 2, with Evaluate the desalination efficiency;

[0055] Group A: The intermittent heating and power-on cycle is: heating and power-on for 40 minutes, cooling and power-off for 20 minutes;

[0056] Group B: The intermittent heating and power-on cycle is: heating and power-on for 50 minutes, cooling and power-off for 25 minutes;

[0057] Group C: The intermittent heating and power-on cycle is: heating and power-on for 60 minutes, cooling and power-off for 30 minutes; ...

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Abstract

The invention provides a high-efficiency electrochemical desalination method and device based on intermittent energization, and relates to the technical field of concrete electrochemical repair. The electrochemical desalination method includes: S1, constructing an electrochemical reaction system; S2, heating the electrolyte for 5-15 minutes Finally, the DC power supply is powered on; S3, after heating the electrolyte for 50-70 minutes, switch to cooling the electrolyte, and after the electrochemical reaction is 50-70 minutes, the DC power supply is powered off; S4, after the electrolyte is cooled for 20-40 minutes, resume heating , and after the DC power supply is cut off for 20-40 minutes, the power is restored; S5, repeating steps S2-S4 until the desalination process is completed. The invention utilizes the tidal force generated by the voltage of power on and off to accelerate the migration of chloride ions; and heats before power on to reduce the binding capacity of chloride ions, and before power off, lowers the temperature so that free chloride ions migrating into the electrolyte are more easily combined Curing; intermittent heating and delayed intermittent energization act synergistically to accelerate the migration rate of chloride ions and improve the removal efficiency of chloride ions.

Description

technical field [0001] The invention relates to the technical field of concrete electrochemical repair, in particular to a high-efficiency electrochemical desalination method and device based on intermittent energization. Background technique [0002] The concrete material itself is relatively brittle, and its tensile and bending resistance is poor, so reinforcement needs to be reinforced. Reinforced concrete combines many advantages of steel bars and concrete, has good structural performance and durability, and is widely used in civil engineering. However, in the service process of reinforced concrete structures, the corrosion of steel bars caused by external environmental erosion is the most common form of damage. Among them, the corrosion of steel bars caused by chloride corrosion is the main culprit in destroying reinforced concrete structures. External chloride ions enter the interior of the concrete structure through the combined action of diffusion and penetration, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E04G23/02C23F15/00
CPCC23F15/00E04G23/0218
Inventor 蒋林华陈赟杰严先萃朱鹏飞查捷宋子健
Owner HOHAI UNIV
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