CN106830372A - Automatic cleaning-type device for electrochemical water preparation and its operation method - Google Patents

Abstract

Automatic cleaning-type device for electrochemical water preparation and its operation method, after the device includes being arranged on water circulating pump, can carry out bypass treatment to recirculated water, and it includes：Apparatus for electrochemical treatment, switch board and corresponding electrically operated valve, ball valve, pressure-reducing valve, flowmeter etc., switch board by detecting operating apparatus for electrochemical treatment yin, yang pole plate between electric current drop-out value or according to the data of operation duration as switch board self-cleaning signal input, realize running apparatus for electrochemical treatment and cleaning Based Intelligent Control；The device does not use mechanical doctor, in the case of without manual intervention, recirculated water can be processed with continuous-stable.

Description

Self-cleaning electrochemical water treatment device and its operating method

technical field

The invention relates to a circulating water electrochemical treatment device, in particular to an automatic cleaning type electrochemical water treatment device and its operation method.

Background technique

The circulating cooling water is continuously circulated and evaporated in the system, and the concentration of carbonates increases with the concentration. When the concentration of carbonates exceeds its saturation concentration or the temperature of the heat exchanger rises, scale will be formed, which will affect the heat exchange efficiency and even block it. pipeline.

Bacteria and algae in circulating cooling water will multiply rapidly due to factors such as nutrient concentration, water temperature rise, and sunlight exposure. Microorganisms secrete mucus and produce slime to reduce heat transfer efficiency, block waterways and cause microbial corrosion.

The vast majority of domestic enterprises use dosing to maintain stable water quality, regularly add corrosion and scale inhibitors to circulating water to prevent corrosion and scaling of pipelines and heat exchange equipment, and regularly add bactericide and algicide to prevent the growth of bacteria and algae, etc. The operation cost of this method is high, and the organic phosphorous compound contained in the waste water that is forced to discharge by the system will pollute the environment and waste water resources.

Electrochemical water treatment technology refers to the use of electrochemical oxidation-reduction reactions to reduce water to OH ^- at the cathode by applying a certain DC voltage between the positive and negative electrodes to generate direct current, and the OH ^- ions destroy the alkalinity and hardness balance of the cathode , HCO ₃ ^- in the solution is converted into CO ₃ ^2- and Ca ²⁺ and Mg ²⁺ in the circulating water react to form CaCO ₃ and Mg(OH) ₂ and other precipitates. In addition, Ca ²⁺ and Mg ²⁺ will also migrate to the cathode under the action of electrostatic attraction to accelerate the reaction, thereby reducing the hardness of the water body. At the same time, the chlorine ions in the water in the anode area are oxidized to chlorine gas, hypochlorous acid, and hypochlorite radicals to achieve sterilization and algae removal.

Existing electrochemical treatment equipment mostly uses a mechanical scraper to deal with cathode scaling, or puts the electrochemical treatment equipment in a circulating water pool for a certain period of time and then takes it out for cleaning. Both of these methods have some disadvantages. In the former, the mechanical scraper is easy to damage The surface of the electrode is unstable with wear and tear, and the latter cannot achieve continuous and stable operation.

In addition, the existing electrochemical treatment equipment has a complicated way of judging whether the electrode plate should be cleaned. The most intuitive manifestation of electrode plate scaling that needs to be cleaned is the current drop. The current drop value is combined with the operating time to judge the cleaning of the electrode plate. The time point is the most simple and reasonable.

Contents of the invention

In order to overcome the shortcomings of the above-mentioned prior art, the present invention provides a self-cleaning electrochemical water treatment device and its operation method, which can realize descaling and sterilization of circulating water without using chemicals. Continuous and stable operation is achieved without mechanical scraper and manual cleaning.

To achieve the above object, the present invention adopts the following technical solutions:

The self-cleaning electrochemical water treatment device includes an electrochemical treatment device 5, a water inlet pipe 19 arranged at the lower part of the electrochemical treatment device 5, a water outlet pipe 22 at the upper part of the opposite side, and a flushing water pipe 21 arranged at the top of the electrochemical treatment device 5 , the sewage pipe 18 at the bottom, the other end of the water inlet pipe 19, the water outlet pipe 22 and the flushing water pipe 21 are all connected to the circulating pool 2; The electrochemical treatment device 5 returns to the circulating water pool 2 again to form a circulating bypass treatment. While descaling, the treated circulating water containing hypochlorous acid and hypochlorite is returned to the circulating pool to realize the function of sterilization and algae removal;

It also includes an inlet electric valve 10, a flow meter 9, an inlet ball valve 8, and a pressure reducing valve 7 which are sequentially arranged on the water inlet pipe 19. And outlet electric valve front ball valve 13, flushing electric valve 12 and flushing electric valve front ball valve 11 arranged on the flushing water pipe 21, sewage electric valve 16 and sewage electric valve front ball valve 15 arranged on the sewage pipe 18;

It also includes a control cabinet 6 connected to the inlet electric valve 10 , outlet electric valve 14 , flushing electric valve 12 , blowdown electric valve 16 , and the anode plate 24 and cathode plate 25 of the electrochemical treatment device 5 .

Described electrochemical treatment device 5 comprises lower box body 17 and upper sealing cover 20, and the two are connected by bolts, and the bottom of lower box body 17 is funnel-shaped; There are anode plates 24 and cathode plates 25, the anode plates 24 and the cathode plates 25 are arranged in parallel, and the plates of the same polarity are connected to each other through bolts and wires, and finally the lower box 17 is connected to the regulated DC power supply in the control cabinet 6.

The water inlet pipe 19 and the water outlet pipe 22 are arranged in a main pipe-branch type, and the branch pipe is located in the middle of two adjacent electrode plates; the flushing water pipe 21 on the top of the upper sealing cover 20 is also arranged in a main pipe-branch type.

The anode plate 24 and the cathode plate 25 are mesh plate electrodes or plate electrodes, the anode is a platinum-plated titanium anode, and the cathode is a titanium cathode or a stainless steel cathode.

The lower casing 17 and the upper sealing cover 20 of the electrochemical processing device 5 are made of stainless steel and lined with an insulating coating.

In the operation method of the self-cleaning type electrochemical water treatment device, the inlet electric valve 10 and the outlet electric valve 14 of the electrochemical treatment device 5 are opened through the control cabinet 6 during operation, the flushing electric valve 12 and the sewage electric valve 16 are closed, and monitoring During operation, the electric current between the anode plate 24 and the cathode plate 25 of the electrochemical treatment device 5 drops relative to the initial current. Cleaning, at this time, close the inlet electric valve 10 and the outlet electric valve 14 of the electrochemical treatment device 5, open the flushing electric valve 12 and the sewage electric valve 16 of the electrochemical treatment device, switch the positive and negative poles of the regulated DC power supply, and the voltage increases to 3 times of the operating voltage, after 5 minutes of inverted electrode treatment, close the flushing electric valve 12 and the sewage electric valve 16 of the electrochemical treatment device 5, open the inlet electric valve 10 and the outlet electric valve 14 of the electrochemical treatment device 5, and turn the stabilized DC The positive and negative poles of the power supply are switched back, the voltage returns to the normal operating voltage, and the normal operation is resumed; the inlet ball valve 8 takes into account the role of regulating the flow of treated water, the front ball valve 11 of the flushing electric valve, the front ball valve 13 of the outlet electric valve and the front ball valve 15 of the sewage electric valve are normal Keep fully open during operation.

The pressure after the inlet water passes through the pressure reducing valve 7 is set at 0.2Mpa.

The present invention has the following advantages:

1. It has the functions of scale inhibition and sterilization of circulating water, stabilizes the water quality of circulating water, increases the concentration ratio of circulating water, does not need to use chemicals and discharge sewage, and saves water.

2. The equipment can realize the adjustment of the voltage between the cathode and anode plates and the flow rate of the treated water, and change the treatment capacity according to the demand.

3. Judging whether the electrode plates need to be cleaned is judged by the drop value of the current flowing between the plates, and combined with consideration of the running time, which is intuitive, accurate and easy to implement.

4. The cleaning of the electrode plate does not use a mechanical scraper, and the scaled electrode plate is cleaned by inverting the electrode, and the effect is remarkable and stable.

5. This device can realize fully automatic operation, automatically switch between operation and cleaning modes, without manual operation, simple equipment and high reliability.

Description of drawings

Fig. 1 is a flowchart of the application of the present invention in a circulating water system.

Fig. 2 is a schematic diagram of the main structure of the electrochemical treatment device of the present invention.

Fig. 3 is a schematic diagram of an implementation of the electrochemical treatment device of the present invention loaded into an electrode plate.

Among Fig. 1: 1 is the circulating water cooling tower, 4 is the circulating water heat exchanger.

detailed description:

As shown in Fig. 1, Fig. 2 and Fig. 3, the self-cleaning electrochemical water treatment device of the present invention is installed behind the circulating water pump, and can carry out bypass treatment to the circulating water, including the electrochemical treatment device 5, which is arranged in the electrochemical treatment The water inlet pipe 19 at the lower part of the device 5 side, the water outlet pipe 22 at the upper part of the opposite side, the flushing water pipe 21 at the top of the electrochemical treatment device 5, the sewage discharge pipe 18 at the bottom, the water inlet pipe 19, the water outlet pipe 22 and the flushing water pipe 21 The other end is connected to the circulating water pool 2; the water inlet pipe 19 is connected to the main pipe at the outlet of the circulating water pump 3, and the circulating water flows from the outlet of the circulating water pump 3 to the electrochemical treatment device 5 and then returns to the circulating water pool 2 to form a circulating bypass treatment for descaling At the same time, the processed circulating water containing hypochlorous acid and hypochlorite is returned to the circulating pool to realize the function of sterilization and algae removal; it also includes the imported electric valve 10, flow meter 9, imported ball valve 8 and The pressure reducing valve 7 and the inlet ball valve 8 take into account the role of adjusting the flow of treated water. The outlet electric valve 14 and the ball valve 13 before the outlet electric valve are arranged on the outlet pipe 22, and the flushing electric valve 12 and the flushing electric valve are arranged on the flushing water pipe 21. The front ball valve 11, the blowdown electric valve 16 and the blowdown electric valve front ball valve 15 arranged on the sewage pipe 18; also include the electric valve for inlet 10, the electric outlet valve 14, the electric flushing valve 12, the electric blowdown valve 16 and the electrochemical treatment device The control cabinet 6 that the anode plate 24 and the cathode plate 25 of 5 are connected.

As shown in Fig. 2 and Fig. 3, described electrochemical treatment device 5 comprises lower box body 17 and upper sealing cover 20, and the two are connected by bolts, and the bottom of lower box body 17 is funnel-shaped; Lower box body 17 side walls have The card slot 23, the anode plate 24 and the cathode plate 25 are fixed on the card slot 23, the anode plate 24 and the cathode plate 25 are arranged alternately and parallel, the plates of the same polarity are connected to each other by bolts and wires, and finally the lower box body 17 is led out to the control cabinet The regulated DC power supply within 6 is connected.

As a preferred embodiment of the present invention, the water inlet pipe 19 and the water outlet pipe 22 are arranged in a main pipe-branch type, and the branch pipe is located in the middle of two adjacent electrode plates; the flushing water pipe 21 on the top of the upper sealing cover 20 is also a main pipe. Pipe-branch arrangement. The advantage of the main pipe-branch arrangement is that the main pipe-branch arrangement ensures uniform and stable water flow through each electrode plate during operation, and the main pipe-branch arrangement ensures uniform washing of the electrode plates during automatic cleaning comprehensive.

As a preferred embodiment of the present invention, the anode plate 24 and the cathode plate 25 are mesh plate electrodes or plate electrodes, the anode is a platinum-plated titanium anode, and the cathode is a titanium cathode or a stainless steel cathode.

As a preferred embodiment of the present invention, the lower box body 17 and the upper sealing cover 20 of the electrochemical treatment device 5 are made of stainless steel and lined with an insulating coating, which not only ensures the firmness and stability of the device, but also prevents short circuits between the negative and positive electrode plates.

The operation method of the automatic cleaning type electrochemical water treatment device of the present invention, during operation, the inlet electric valve 10 and the outlet electric valve 14 of the electrochemical treatment device 5 are opened through the control cabinet 6, the flushing electric valve 12 and the sewage electric valve 16 are closed, and the operation is monitored. During the process, the current drop between the anode plate 24 and the cathode plate 25 of the electrochemical treatment device 5 relative to the initial current, when the current drops by 1A or the running time reaches 36h, the self-cleaning of the anode plate 24 and the cathode plate 25 is performed. , close the inlet electric valve 10 and the outlet electric valve 14 of the electrochemical treatment device 5, open the flushing electric valve 12 and the sewage electric valve 16 of the electrochemical treatment device, switch the positive and negative poles of the regulated DC power supply, and increase the voltage to 3% of the operating voltage After 5 minutes of reverse electrode treatment, close the flushing electric valve 12 and the sewage electric valve 16 of the electrochemical treatment device 5, open the inlet electric valve 10 and the outlet electric valve 14 of the electrochemical treatment device 5, and connect the positive and negative poles of the regulated DC power supply Switch back, the voltage returns to the normal operating voltage, and resumes normal operation; the inlet ball valve 8 takes into account the role of regulating the flow of treated water, and the front ball valve 11 of the flushing electric valve, the front ball valve 13 of the outlet electric valve, and the front ball valve 15 of the sewage electric valve are maintained during normal operation. fully open. Doubling the current density in a short period of time after inverting the electrode makes the bubbles on the surface of the electrode plate suddenly increase, and the mechanical force generated by a large number of air bubbles makes the loose scale layer on the electrode surface peel off quickly; in addition, the electrode surface is replaced by the original operating alkali The acidic environment becomes an acidic environment, which promotes the exfoliation of scale.

As a preferred embodiment of the present invention, the pressure of the incoming water after passing through the pressure reducing valve 7 is set at 0.15-0.2 Mpa, which not only ensures the pressure required for water treatment but also facilitates the sealing of the equipment.

Claims (7)

1. Self-cleaning type electrochemical water treatment device is characterized in that: comprise electrochemical treatment device (5), be arranged on the water inlet pipe (19) of side bottom of electrochemical treatment device (5), the outlet pipe (22) of opposite side upper part ), the flushing water pipe (21) at the top of the electrochemical treatment device (5), the sewage pipe (18) at the bottom, the other end of the water inlet pipe (19), the water outlet pipe (22) and the flushing water pipe (21) are all Connected to the circulating water pool (2); the water inlet pipe (19) is connected to the outlet main pipe of the circulating water pump (3), and the circulating water flows from the outlet of the circulating water pump (3) to the electrochemical treatment device (5) and then returns to the circulating water pool (2), Form a circulating bypass treatment, and return the treated circulating water containing hypochlorous acid and hypochlorite to the circulating pool while descaling, so as to realize the function of sterilization and algae removal; It also includes an imported electric valve (10), a flow meter (9), an imported ball valve (8) and a pressure reducing valve (7) arranged sequentially on the water inlet pipe (19). , the outlet electric valve (14) and the ball valve (13) before the outlet electric valve are arranged on the outlet pipe (22), the flushing electric valve (12) and the front ball valve (11) of the flushing electric valve (11) are arranged on the flushing water pipe (21) , the blowdown electric valve (16) and the front ball valve (15) of the blowdown electric valve (15) are arranged on the blowdown pipe (18); It also includes the anode plate (24) and the cathode plate (25) of the inlet electric valve (10), the outlet electric valve (14), the flushing electric valve (12), the sewage electric valve (16) and the electrochemical treatment device (5). connected control cabinet (6). 2. The self-cleaning electrochemical water treatment device according to claim 1, characterized in that: the electrochemical treatment device (5) comprises a lower casing (17) and an upper sealing cover (20), the two are connected by bolts connection, the bottom of the lower box (17) is funnel-shaped; the side wall of the lower box (17) has a card slot (23), and the card slot (23) is fixed with an anode plate (24) and a cathode plate (25), and the anode Plates (24) and cathode plates (25) are alternately arranged in parallel, and plates of the same polarity are connected to each other by bolts and wires, and finally lead out the lower box (17) to connect with the regulated DC power supply in the control cabinet (6). 3. The self-cleaning electrochemical water treatment device according to claim 2, characterized in that: the water inlet pipe (19) and the water outlet pipe (22) are arranged in a main pipe-branch type, and the branch pipes are located in the adjacent In the middle of the two electrode plates; the flushing water pipe (21) on the top of the upper sealing cover (20) is also arranged in a main pipe-branch type. 4. The self-cleaning type electrochemical water treatment device according to claim 2, characterized in that: said anode plate (24) and cathode plate (25) are mesh plate electrodes or plate electrodes, and the anode is platinum-plated titanium The anode and the cathode are titanium cathodes or stainless steel cathodes. 5. The self-cleaning type electrochemical water treatment device according to claim 2, characterized in that: the lower box body (17) and the upper sealing cover (20) of the electrochemical treatment device (5) are made of stainless steel material lined with insulating coating Floor. 6. The operating method of the self-cleaning electrochemical water treatment device according to any one of claims 1 to 5, characterized in that: the electric inlet valve ( 10) and the outlet electric valve (14), close the flushing electric valve (12) and the blowdown electric valve (16), and monitor the anode plate (24) and the cathode plate (25) of the electrochemical treatment device (5) during operation. The current drop of the current relative to the initial current, when the current decreases by a certain value or the running time reaches the set value, the self-cleaning of the anode plate (24) and the cathode plate (25) is performed, at this time, the electrochemical treatment device (5) is turned off Inlet electric valve (10) and outlet electric valve (14), open the electrochemical treatment device flushing electric valve (12) and sewage electric valve (16), switch the positive and negative poles of the regulated DC power supply, and the voltage increases to 3% of the operating voltage After 5 minutes of electrode treatment, close the flushing electric valve (12) and sewage electric valve (16) of the electrochemical treatment device (5), and open the inlet electric valve (10) and outlet electric valve of the electrochemical treatment device (5) (14), switch the positive and negative poles of the regulated DC power supply back, and restore the normal operating voltage to normal operation; the inlet ball valve (8) takes into account the role of adjusting the flow of treated water, and flushes the front ball valve (11) of the electric valve and the outlet electric valve. The front ball valve (13) of the valve and the front ball valve (15) of the sewage electric valve keep fully open during normal operation. 7. The operation method according to claim 6, characterized in that: the pressure of the incoming water passing through the pressure reducing valve (7) is set to 0.2Mpa.