Industrial circulating water electrolysis side-stream filtration device and a method for industrial circulating water side-stream filtration

Abstract

An industrial circulating water electrolytic side-stream filtration device includes a circulating pump and an electrolytic cell. Cathode plates and anode plates are arranged alternately within the electrolytic cell, with each anode plate housed in a matching anode chamber. A diaphragm is positioned parallel to both sides of the anode plate within each anode chamber. Scrapers are fitted to the cathode plates. This invention addresses the characteristics of circulating cooling water with high alkalinity, severe scaling, and unsuitability for chemical agents. It specifically employs electrolysis to separate cations, primarily calcium and magnesium ions, from anions, primarily chloride ions, in the circulating water. Anions in the acidic effluent from the anode outlet are oxidized to form hypochlorite, creating a strong composite oxidant that sterilizes and kills algae, balancing the pH in the circulating water tank. Cations in the alkaline effluent from the cathode outlet are precipitated and removed in a sedimentation tank before being returned to the circulating water tank. The treated circulating water exhibits a significantly reduced ion content.

Description

Technical Field

[0001] This invention relates to a filtration device, and more particularly to an industrial circulating water electrolysis side-stream filtration device and an industrial circulating water side-stream filtration method. Background Technology

[0002] Currently, many industrial equipment uses circulating water cooling systems, which cool by absorbing heat through water evaporation. Due to the large evaporation rate, the ion content in the circulating water continuously increases, making it prone to scaling and affecting equipment operation. To reduce the ion content, the current solution is to continuously drain and replenish water, but this method is wasteful of water resources and ineffective. Using conventional chemical methods also results in large amounts of sediment that are difficult to clean, easily causing equipment corrosion, increasing the failure rate, and reducing service life. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides an industrial circulating water electrolysis side-stream filtration device.

[0004] The technical solution adopted in this invention is: an industrial circulating water electrolysis side-stream filtration device, including a circulating pump and an electrolytic cell. The electrolytic cell is provided with a cathode plate and an anode plate, which are arranged alternately. Each anode plate is located in a matching anode chamber. The anode chamber is provided with an anode inlet communicating with the inside of the electrolytic cell and an anode outlet communicating with the outside of the electrolytic cell. The electrolytic cell is provided with an inlet and a cathode outlet. The two sides of the anode chamber parallel to the anode plate are diaphragms. The cathode plate is provided with a scraper.

[0005] The industrial circulating water electrolysis side-stream filtration device is characterized in that: the scraper is mounted on a connecting frame, and the connecting frame is fixedly connected to the piston rod of the cylinder.

[0006] The industrial circulating water electrolysis side-stream filtration device is characterized in that: a slag discharge port is provided at the bottom of the electrolysis cell, and the slag discharge port is connected to a lime concentration tank.

[0007] The industrial circulating water electrolysis side-stream filtration device is characterized in that: the cathode outlet pipe is connected to the sedimentation reaction tank, and the booster pump is located between the circulating water tank and the inlet.

[0008] The industrial circulating water electrolysis side-stream filtration device is characterized in that: a sewage outlet is provided at the bottom of the sedimentation reaction tank, and the slag outlet is connected to the lime concentration tank.

[0009] A method for side-stream filtration of industrial circulating water includes the following steps:

[0010] Step 1: The circulating water in the circulating water tank is introduced into the electrolytic cell equipped with anode and cathode plates. Step 2: The anode and cathode plates are arranged alternately, with each anode plate placed in its matching anode chamber. A diaphragm is located on both sides of the anode chamber. The portion of the electrolytic cell exiting the anode chamber is the cathode chamber. The circulating water in the electrolytic cell is divided into two paths: one path passes through the cathode plate and is discharged through the cathode outlet pipe; the other path passes through the anode plate in the anode chamber and is discharged through the anode outlet pipe. The anode plates attract anions, primarily chloride ions, from the circulating water in the electrolytic cell, while the cathode plates attract cations, primarily calcium and magnesium ions. Anions and cations drift through the diaphragm, causing cations to accumulate in the cathode chamber and anions to accumulate in the anode chamber. Step 3: The circulating water in the cathode chamber is discharged into the sedimentation reaction tank through the cathode outlet pipe, and after sedimentation, it is finally returned to the circulating water tank. The circulating water in the anode chamber is returned to the circulating water tank through the anode outlet pipe.

[0011] This invention addresses the challenges of high alkalinity and severe scaling in circulating cooling water, making chemical agents unsuitable. It employs electrolysis to separate cations, primarily calcium and magnesium ions, from anions, primarily chloride ions, within the circulating water. The electrolytic cell is equipped with a cathode outlet pipe and an anode outlet pipe connecting to the anode chamber, ensuring complete separation of cations and anions. In the acidic effluent from the anode outlet pipe, anions are oxidized to form hypochlorite, creating a strong composite oxidant that sterilizes and kills algae in the circulating water tank, balancing the pH. In the alkaline effluent from the cathode outlet pipe, cations are precipitated and removed in a sedimentation tank before being returned to the circulating water tank. The treated circulating water exhibits a significantly reduced ion content. The cathode plate is equipped with a scraper to periodically remove scale formed by calcium and magnesium ions, ensuring efficient plate operation and maintaining a low ion count in the circulating water even after long-term use. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the pipeline connections of each device in this invention;

[0013] Figure 2 This is a schematic diagram of the electrolytic cell structure of the present invention;

[0014] Figure 3 This is a schematic diagram of the electrolytic cell structure of the present invention.

[0015] In the diagram: 1-Electrolytic cell, 11-Cathode plate, 12-Anode plate, 121-Anode chamber, 122-Anode water inlet, 123-Anode water outlet pipe, 124-Diaphragm, 13-Water inlet, 14-Cathode water outlet pipe, 15-Slag discharge port, 16-Scraper, 161-Connecting frame, 162-Drive cylinder, 163-Mounting frame, 2-Circulating pump, 3-Lime concentration tank, 4-Sedimentation reaction tank, 41-Sewage outlet, 5-Cooling tower, 6-Circulating water tank. Detailed Implementation

[0016] An industrial circulating water electrolysis side-stream filtration device includes an electrolytic cell 1, a circulating pump 2, a lime concentration tank 3, and a sedimentation reaction tank 4. Figure 1 As shown, in this embodiment, the equipment that needs to perform circulating water filtration is a cooling tower, which is equipped with a cooling tower 5 and a circulating water pool 6.

[0017] like Figure 2 , 3 As shown, the cathode plates 11 and anode plates 12 are arranged alternately inside the electrolytic cell 1. Each anode plate is provided with a separate anode chamber 121. The electrolytic cell 1 is provided with an inlet 13 connecting the circulating water tank 6 and a cathode outlet pipe 14. A circulating pump 2 is provided between the circulating water tank 6 and the inlet 13. The anode chamber 121 is provided with an anode inlet hole 122 and an anode outlet pipe 123. The anode inlet hole 122 is connected to the inside of the electrolytic cell 1, and the anode outlet pipe 123 extends out of the electrolytic cell 1 and is directly connected to the outside. The anode outlet pipes of different anode chambers are connected to a main pipe. The bottom of the electrolytic cell 1 is provided with a slag discharge port 15 that can be controlled to open and close. Each cathode plate is equipped with two scrapers 16, corresponding to the two sides of the plate respectively. The scrapers 16 are installed at the end of the piston rod of the cylinder 162 through the connecting frame 161. The scrapers 16 are initially positioned above the liquid surface of the electrolytic cell to avoid corrosion. The cylinder 162 is inverted with the piston rod extending downwards. The cylinder body is fixed on the corresponding fixed mounting frame. The cylinder model and quantity depend on the specific model of the equipment. The schematic diagram shows one cylinder.

[0018] like Figure 1 As shown, the anode outlet pipe 123 is connected to the sedimentation reaction tank 4, and the slag discharge port 15 is connected to the lime thickening tank 3. The sedimentation reaction tank 4 is equipped with a controllable opening and closing sewage discharge port 41, which is connected to the lime thickening tank 3. The slag discharge port 15 and the sewage discharge port 41 can be automatic gate valves, automatic butterfly valves, or valves with similar structures and functions.

[0019] During filtration, the circulation pump 2 is energized and started with the cathode and anode plates. The circulating water in the circulating water tank enters the electrolytic cell 6 through the circulation pump 2. In the electrolytic cell 6, anions, mainly chloride ions, are attracted by the anode plate and enter the anode chamber, and are discharged through the anode outlet pipe 123. Cations, mainly calcium and magnesium ions, are attracted by the cathode plate and are discharged through the cathode outlet pipe 14.

[0020] The liquid discharged from the anode outlet pipe flows directly back into the circulating water tank 6. During circulation, chloride ions are oxidized to generate a complex substance containing hypochlorite, which has strong oxidizing and disinfecting properties and a low pH value. After flowing back into the circulating water tank 6, it can not only kill bacteria and algae in the water, but also regulate the acid-base balance in the water. The liquid discharged from the cathode outlet pipe flows into the sedimentation reaction tank 4. After a large amount of calcium and magnesium ions are removed by sedimentation, it flows back into the circulating water tank 6. The sewage outlet 41 at the bottom of the sedimentation reaction tank is opened periodically to discharge the bottom sediment into the lime concentration tank 3.

[0021] During the ionization of circulating water, scale easily forms on the cathode plate surface, significantly impacting its working efficiency. Therefore, at regular intervals, the cylinder is activated, causing its piston rod to reciprocate once within a specified stroke. Correspondingly, the scraper scrapes the scale up and down the cathode plate surface once. By setting appropriate intervals, the cathode plate maintains a large effective working surface, thus ensuring efficient equipment operation. The scale scraped off by the scraper eventually settles to the bottom of the electrolytic cell. When a significant amount of scale accumulates at the bottom, the slag discharge port 15 is opened to discharge the scale into the lime concentration tank 3. The lime concentration tank only needs periodic cleaning.

Claims

1. An industrial circulating water electrolysis side-stream filtration device, comprising a circulating pump and an electrolytic cell, wherein a cathode plate and an anode plate are disposed within the electrolytic cell, characterized in that: The cathode and anode plates are arranged alternately in the electrolytic cell. Each anode plate is located in a matching anode chamber. The anode chamber is provided with an anode water inlet communicating with the inside of the electrolytic cell and an anode water outlet communicating with the outside of the electrolytic cell. Circulating water in the anode chamber flows back to the circulating water pool through the anode water outlet. The electrolytic cell is provided with a water inlet and a cathode water outlet. The two sides of the anode chamber parallel to the anode plates are diaphragms. The cathode plates are matched with scrapers. The scrapers are mounted on a connecting frame, and the connecting frame is fixedly connected to the piston rod of the cylinder. The bottom of the electrolytic cell is provided with a slag discharge port, which is connected to the lime concentration tank. The cathode outlet pipe is connected to the sedimentation reaction tank, and the circulation pump is located between the circulation tank and the inlet. A drain outlet is provided at the bottom of the sedimentation reaction tank, and the drain outlet is connected to the lime concentration tank.

2. A method for side-stream filtration of industrial circulating water, characterized in that: Includes the following steps: Step 1: Introduce the circulating water from the circulating water tank into the electrolytic cell equipped with cathode and anode plates; Step 2: The anode and cathode plates are arranged alternately, with each anode plate placed in a matching anode chamber. A diaphragm is located on both sides of the anode chamber. The portion of the electrolytic cell that exits the anode chamber is the cathode chamber. The circulating water in the electrolytic cell is divided into two paths: one path passes through the cathode plate and is discharged through the cathode outlet pipe, while the other path passes through the anode plate in the anode chamber and is discharged through the anode outlet pipe. The anode plates attract anions (including chloride ions) from the circulating water, while the cathode plates attract cations (including calcium and magnesium ions). Anions and cations drift through the diaphragm, causing cations to accumulate in the cathode chamber and anions to accumulate in the anode chamber. Step 3: The circulating water in the cathode chamber is discharged into the sedimentation reaction tank through the cathode outlet pipe. After sedimentation, it is finally returned to the circulating water tank. The circulating water in the anode chamber is returned to the circulating water tank through the anode outlet pipe.

Images