CN114249387A - Method for treating circulating cooling water by deposition electrode self-coupling inverse pole descale - Google Patents

Method for treating circulating cooling water by deposition electrode self-coupling inverse pole descale Download PDF

Info

Publication number
CN114249387A
CN114249387A CN202111639580.5A CN202111639580A CN114249387A CN 114249387 A CN114249387 A CN 114249387A CN 202111639580 A CN202111639580 A CN 202111639580A CN 114249387 A CN114249387 A CN 114249387A
Authority
CN
China
Prior art keywords
electrode
deposition
descaling
group
cooling water
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202111639580.5A
Other languages
Chinese (zh)
Inventor
陈雪明
张雪娇
谢莹丰
李爽
张月
邓世俊
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhejiang University ZJU
Original Assignee
Zhejiang University ZJU
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zhejiang University ZJU filed Critical Zhejiang University ZJU
Priority to CN202111639580.5A priority Critical patent/CN114249387A/en
Publication of CN114249387A publication Critical patent/CN114249387A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/4602—Treatment of water, waste water, or sewage by electrochemical methods for prevention or elimination of deposits
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/4606—Treatment of water, waste water, or sewage by electrochemical methods for producing oligodynamic substances to disinfect the water
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/50—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/04—Disinfection

Abstract

The invention discloses a method for treating circulating cooling water by deposition electrode self-coupling inverted pole descaling. The deposition electrode and the DSA electrode are arranged in a staggered way in an electrode area of circulating cooling water, and the treatment and the descaling are alternately operated by adopting two steps: during treatment, the deposition electrode is used as a cathode, the DSA electrode is used as an anode, the hardness and alkalinity are removed by utilizing the electrodeposition principle, and the generated hypochlorite disinfectant is utilized for sterilization and algae removal; when in descaling, the DSA electrodes are not electrified, all the deposition electrodes are mutually coupled in groups to carry out reversed electrode descaling, and the descaling is carried out after the descaling; the DSA electrode is only used as an anode and does not participate in cathode reaction during descaling. The invention overcomes the problem that the DSA electrode is seriously damaged because the polarity of the DSA electrode needs to be frequently switched in the prior inverse pole descaling technology, is suitable for the treatment of industrial circulating cooling water and is also used for the water treatment taking electrodeposition as a basic principle.

Description

Method for treating circulating cooling water by deposition electrode self-coupling inverse pole descale
Technical Field
The invention relates to a method for treating circulating cooling water, in particular to an electrochemical method for treating circulating cooling water, which avoids damaging DSA (dimensionally stable anode) electrodes by depositing electrode self-coupling inverted-electrode descale.
Background
The circulating cooling water is widely applied to industries such as electric power, petrochemical industry, metallurgy and the like. In the long-term recycling process, water is continuously evaporated, so that the salt content of the circulating cooling water is gradually increased, and hardness ions are easy to form scale deposits on the heat transfer surface. This not only can reduce heat exchange efficiency, still can block up the pipeline, causes very big harm for normal production. In addition, the circulating cooling water contains organic matters and nitrogen and phosphorus compounds, and microorganisms such as bacteria and algae can utilize the nutrient substances to breed in a large quantity in the circulating cooling water system, which also causes great harm to normal production. Therefore, the circulating cooling water needs to be effectively treated during use.
Generally, the circulating cooling water is treated by mainly adding chemical agents such as scale inhibitors, disinfectants and the like at home and abroad. Although the method is effective, the cost of the medicament is high, and the scale inhibitor contains a large amount of phosphorus elements, so that natural water eutrophication is easy to cause and the environment is polluted. In recent years, the electrochemical method has been widely used for the treatment of circulating cooling water. The method mainly utilizes direct current to promote the electrolysis of water on the surface of a cathode to generate a large amount of OH-React with hardness and alkalinity ions in water to form CaCO3And Mg (OH)2Precipitating and depositing on the surface of the cathode, thereby effectively removing hardness and alkalinity ions; at the same time, the H generated by oxygen evolution main reaction on the DSA electrode is utilized+Further reducing the alkalinity, and sterilizing and killing algae for the circulating cooling water by using a hypochlorite disinfectant generated by a chlorine evolution side reaction. Compared with the method of adding chemical agents, the electrochemical method has the advantages of high treatment efficiency, environmental friendliness, low operating cost, wide application range, simplicity and convenience in operation and the like. Currently, most of the industrial devices use DSA electrode as anode toCarbon steel is a cathode, a mechanical descaling method is adopted to remove a scale layer deposited on the carbon steel cathode, the mechanical descaling method has the advantages that an expensive DSA electrode cannot be damaged, the descaling effect is poor, the scale layer is easy to accumulate in a local area of the cathode, the treatment efficiency is influenced, the energy consumption is increased, and a transmission device is easy to damage and needs to be maintained frequently. The previous patent (ZL201810546494.1) describes a device for treating recirculated cooling water, the electrodes used in this device are all DSA electrodes, operating in a periodically inverted manner: during treatment, the hardness and alkalinity are removed by utilizing the principle of electrodeposition, and the generated hypochlorite is utilized to sterilize and algae-killing the circulating cooling water; during descaling, the cathode and the anode of the electrode are exchanged, and the cathode originally covered with the scale layer is used as the anode to generate H+，H+With CaCO inside the scale layer3And Mg (OH)2The reaction makes it dissolve, promoting the scale layer to fall off. The technology of the patent has obvious effect on descaling, but when the DSA electrode with high price is used as a cathode, the precious metal component in the oxide coating on the surface of the DSA electrode is easily reduced from a high valence state to a low valence state, so that the coating is damaged and gradually falls off, and the service life of the electrode is obviously shortened.
Disclosure of Invention
In order to overcome the defects of the background art, the invention aims to provide an electrochemical method and a device for treating circulating cooling water, which can avoid the DSA electrode from being damaged and can efficiently and simply remove a scale layer deposited on the electrode.
The technical scheme adopted by the invention is as follows:
a method for treating circulating cooling water by self-coupling reverse-pole descale of a deposition electrode comprises the following steps:
the flat-plate deposition electrode and the netlike DSA electrode are arranged in an interlaced way in an electrode area filled with circulating cooling water, and the two steps of treatment and descale are alternately operated:
during treatment, the deposition electrode is used as a cathode, the DSA electrode is used as an anode, the hardness and alkalinity are removed by utilizing the electrodeposition principle, and the generated hypochlorite is utilized to sterilize and algae-killing;
when in descaling, the DSA electrodes are not electrified, the deposition electrodes are mutually coupled in groups to descale in an inverted mode, and the descale is discharged after the descale.
During the treatment, the current density is controlled to be 30-200A/m2The duration is 20-100 h.
The method for reverse electrode descaling through self-grouping mutual coupling of all the deposition electrodes specifically comprises the following steps:
all the deposition electrodes are numbered according to the arrangement position sequence, all the deposition electrodes with single numbers form a group A, all the deposition electrodes with double numbers form a group B, and then the following operations are carried out:
firstly, electrifying the group A as an anode and the group B as a cathode for one time, wherein the group A promotes the scale layer previously deposited on the group A to fall off through an anode dissolution reaction;
then, electrode reversing is carried out, the group B is used as an anode, the group A is used as a cathode, and electrifying operation is carried out once, and the group B promotes the scale layer previously deposited on the group B to fall off through an anode dissolution reaction;
and (4) after the descaling process is finished, removing scale.
During each electrifying operation during descaling, the current density is set to be 20-100A/m2For 2-20 min.
Secondly, an electrochemical device for treating circulating cooling water by self-coupling inverse pole descale of a deposition electrode:
the method adopts the following electrochemical device, a water inlet uniform distribution area, an electrode area and a water outlet groove are sequentially arranged in the electrochemical device along the circulating cooling water flow direction, the water inlet uniform distribution area, the electrode area and the water outlet groove are sequentially communicated, a scale bucket is arranged in the electrochemical device, and the bottom of the water inlet uniform distribution area and the bottom of the electrode area are communicated with the scale bucket; at least two deposition electrodes and at least one DSA electrode are arranged in parallel along the flow direction of circulating cooling water in the electrode area, and the deposition electrodes and the DSA electrodes are alternately arranged at intervals; all the deposition electrodes are divided into a group A and a group B, all the deposition electrodes in the group A and all the deposition electrodes in the group B are alternately arranged, the upper parts of all the deposition electrodes in the group A are electrically connected with each other, and the upper parts of all the deposition electrodes in the group B are electrically connected with each other; all upper portions of the DSA electrodes are electrically connected to each other.
The water inlet distribution area is provided with a water inlet valve, the water outlet groove is provided with a water outlet pipe, and the bottom of the scale bucket is provided with a scale discharge valve.
The water inlet uniform distribution area, the electrode area and the water outlet groove are provided with clapboards, the lower part of the water inlet uniform distribution area is communicated with the lower part of the electrode area, and the electrode area is communicated with the upper part of the water outlet groove.
The two side surfaces of the DSA electrode are respectively provided with an insulating separator with the void ratio exceeding 80%, and the DSA electrode is clamped and fixed through the insulating separators at the two sides.
The deposition electrode is made of plate-shaped metal materials such as aluminum, iron, carbon steel and the like which can generate anode autolysis reaction, and the thickness of the deposition electrode is 3-10 mm.
In the invention, the flat-plate deposition electrodes and the reticular DSA electrodes are arranged in a staggered manner; the alternative operation of treatment and descaling is adopted, the deposition electrode is used as a cathode and the DSA is used as an anode during treatment, the hardness and alkalinity are removed by utilizing the electrodeposition principle, and the generated hypochlorite is utilized for sterilization and algae removal; when in descaling, the deposition electrodes are divided into two groups, reversed-electrode descaling is carried out by the mutual coupling of the two groups of electrodes, and the descaling is carried out after the descaling process is finished; the DSA electrode is only used as an anode and does not participate in cathode reaction during descaling.
The invention has the beneficial effects that:
1) the DSA electrode is only used as an anode, cathode-anode switching is not needed, and the service life is obviously prolonged.
2) Compared with the prior inverted pole descale technology, the performance requirement on the DSA electrode can be properly reduced, and the content of noble metal in the active component can be greatly reduced, thereby obviously reducing the cost of the DSA electrode.
The invention overcomes the problem that the DSA electrode is seriously damaged because the polarity of the DSA electrode needs to be frequently switched in the prior inverted pole descaling technology, is suitable for the treatment of circulating cooling water in the industries of electric power, petrochemical industry, metallurgy and the like, and plays a role in sterilizing and killing algae while softening and removing the alkalinity of the circulating cooling water. In addition, the invention can also be used for treating other water and wastewater by taking electrodeposition as a basic principle.
Drawings
Fig. 1 is a schematic plan view of the structure of the present invention.
Fig. 2 is a sectional view a-a of fig. 1.
Fig. 3 is a sectional view B-B of fig. 1.
In the figure: 1. the device comprises an electrochemical device, 2, a water inlet uniform distribution area, 3, an electrode area, 4, a water outlet tank, 5, a scale bucket, 6, a water inlet valve, 7, a water outlet pipe, 8, a scale discharge valve, 9, a deposition electrode, 10, a DSA electrode, 11, a left insulating spacer, 12 and a right insulating spacer.
Detailed Description
The invention is further described in the following with reference to the accompanying drawings and examples
As shown in fig. 1 and 2, the electrochemical device 1 is provided with a water inlet uniform distribution area 2, an electrode area 3 and a water outlet tank 4 in sequence along the circulating cooling water flow direction, the water inlet uniform distribution area 2, the electrode area 3 and the water outlet tank 4 are communicated in sequence, a scale bucket 5 is arranged in the bottom of the device, the bottoms of the water inlet uniform distribution area 2 and the electrode area 3 are communicated with the scale bucket 5, and the bottom of the water outlet tank 4 is not communicated with the scale bucket 5.
As shown in fig. 3, at least two flat plate-shaped deposition electrodes 9 and at least one netlike DSA electrode 10 are arranged in parallel along the circulating cooling water flow direction in the electrode area 3, the deposition electrodes 9 and the DSA electrodes 10 are vertically arranged, the deposition electrodes 9 and the DSA electrodes 10 are alternately arranged, and the clear distance between adjacent electrodes is 5-15 mm; all the deposition electrodes 9 are divided into a group A and a group B, the deposition electrodes 9 of the group A and the deposition electrodes 9 of the group B are alternately arranged along the direction perpendicular to the flow direction of the circulating cooling water, the upper parts of all the deposition electrodes 9 in the group A are electrically connected with each other, and the upper parts of all the deposition electrodes 9 in the group B are electrically connected with each other; the upper portions of all DSA electrodes 10 are electrically connected to each other.
In the specific implementation, the deposition electrodes 9 are numbered according to the position sequence, wherein a single number forms a group A, and a double number forms a group B.
The water inlet distribution area 2 is provided with a water inlet valve 6, the water inlet valve 6 is positioned on the side surface of the water inlet distribution area 2, the water outlet tank 4 is provided with a water outlet pipe 7, the water outlet pipe 7 is positioned on the side surface of the water outlet tank 4, and the bottom of the scale bucket 5 is provided with a scale discharge valve 8.
Circulating cooling water flows into the water inlet uniform distribution region 2 from the water inlet valve 6, flows into the electrode region 3 through the space between the water inlet uniform distribution region 2 and the bottom of the electrode region 3 for treatment, flows into the water outlet groove 4 through the space between the electrode region 3 and the top of the water outlet groove 4, and flows out from the water outlet pipe 7 of the water outlet groove 4. The scale layer generated after deposition and descale falls on the scale bucket 5 and is discharged from the scale discharge valve 8 of the scale bucket 5.
The water inlet uniform distribution area 2, the electrode area 3 and the water outlet tank 4 are provided with clapboards, the lower parts of the water inlet uniform distribution area 2 and the electrode area 3 are communicated, and the upper parts of the electrode area 3 and the water outlet tank 4 are communicated.
After the treated circulating cooling water enters the water inlet uniform distribution area, the purpose of energy dissipation and uniform water flow entering the electrode area can be achieved by changing the water flow from horizontal to vertical downward direction.
As shown in fig. 3, the surfaces of both sides of the DSA electrode 10 are provided with insulating spacers, the DSA electrode 10 is clamped and fixed by the insulating spacers on both sides, the insulating spacers on both sides are a left insulating spacer 11 and a right insulating spacer 12, respectively, and the DSA electrode 10 is clamped and fixed by the left insulating spacer 11 and the right insulating spacer 12.
The left insulating spacer 11 is the same as the right insulating spacer 12, has sufficient mechanical strength and stability, cannot deform in the using process, has a void ratio of more than 80 percent, and has a thickness of 3-10 mm.
In a specific implementation, the deposition electrode 9 and the DSA electrode 10 are fixed to both side walls of the electrode region 3.
The bottom surface of the dirt bucket 5 is a bell-mouthed conical surface.
The deposition electrode 9 is made of plate-shaped metal materials such as aluminum, iron, carbon steel and the like which can generate anode autolysis reaction, and the thickness is 3-10 mm.
The flat-plate deposition electrodes and the netlike DSA electrodes are arranged in an interlaced way in an electrode area filled with circulating cooling water, the net distance between adjacent electrodes is 5-15mm, and the two steps of treatment and descale are alternately operated:
during treatment, the deposition electrode is used as a cathode, the DSA electrode is used as an anode, the hardness and alkalinity are removed by utilizing the electrodeposition principle, and the generated hypochlorite is utilized to sterilize and algae-killing;
when in descaling, the DSA electrodes are not electrified, the deposition electrodes are mutually coupled in groups to descale in an inverted mode, and the descale is discharged after the descale.
During treatment, the current density is controlled to be 30-200A/m2The duration is 20-100 h.
At the deposition electrode, OH generated by the hydrogen evolution reaction is utilized-And circulation coolingCa in cooling water2+、Mg2+、HCO3 -Reacting to form CaCO which is poorly soluble3And Mg (OH)2The scale layer is deposited on the surface of the deposition electrode, so that hardness ions and alkalinity in water are effectively removed;
meanwhile, at the DSA electrode, H generated by oxygen evolution main reaction is utilized+Further reducing the alkalinity of the circulating cooling water, and on the other hand, sterilizing and algae killing the circulating cooling water by using a hypochlorite disinfectant generated by a chlorine evolution side reaction.
The electrode-reversing descaling is carried out by mutually coupling all the deposition electrodes in groups, and specifically comprises the following steps:
all the deposition electrodes are numbered according to the arrangement position sequence, all the deposition electrodes with single numbers form a group A, all the deposition electrodes with double numbers form a group B, and then the following operations are carried out:
firstly, the group A is taken as an anode, the group B is taken as a cathode, and the electrifying operation is carried out once, wherein the current density is 20-100A/m2For 2-20min, the group A promotes the scale layer previously deposited on the group A to fall off through the anodic dissolution reaction,
then, electrode reversing is carried out, the group B is used as an anode, the group A is used as a cathode, electrifying operation is carried out once, the current density and duration are kept unchanged, and the group B promotes the scale layer previously deposited on the group B to fall off through an anode dissolution reaction;
and (4) after the descaling process is finished, removing scale.
The measures can effectively protect the DSA electrode, so that the DSA electrode is prevented from being damaged due to frequent polarity switching, and the service life of the DSA electrode is remarkably prolonged.
The working principle of the invention is as follows:
1) when circulating cooling water treatment is carried out: all DSA electrodes are mutually connected and connected with the anode of a direct current power supply through a wiring, and the A group of deposition electrodes and the B group of deposition electrodes are mutually connected and connected with the cathode of the direct current power supply through the wiring; closing the scale discharge valve 8, opening the water inlet valve 6, inputting circulating cooling water into the electrochemical device 1 through the water inlet valve 6, enabling the water flow to pass through the water inlet uniform distribution region 2 from top to bottom and then flow through the electrode region 3, starting the direct-current power supply after the electrode region is filled with water, and controlling the current density to be 30-200A/m2Applying a direct current to the electrochemical device 1 under the conditions of (1) to perform electrochemical treatment by using OH generated by a hydrogen evolution reaction on the deposition electrode-With Ca in the recirculated cooling water2+、Mg2+With HCO3 －Reaction to form CaCO which is sparingly soluble3And Mg (OH)2The scale layer is deposited on the surface of the deposition electrode, so that hardness ions and alkalinity in water are effectively removed, and simultaneously, H generated by oxygen evolution main reaction on the DSA electrode is utilized+The hypochlorite disinfectant generated by the side reaction with chlorine evolution further reduces the alkalinity and sterilizes and algae-exterminates the circulating cooling water.
2) When descaling is carried out: firstly, stopping the power supply of the direct current power supply and closing the water inlet valve 6; switching the electrode connection mode to disconnect the DSA electrode from the DC power supply, connecting the upper parts of all the electrodes in the deposited electrode group A with each other and with the positive electrode of the DC power supply, connecting the upper parts of all the electrodes in the deposited electrode group B with each other and with the negative electrode of the DC power supply, starting the DC power supply, and controlling the current density to be 20-100A/m2Under the condition (1), the group A promotes the scale layer deposited previously to fall off for 2-20min through anodic dissolution reaction; then, the polarity of the electrodes is switched, namely the upper parts of all the electrodes in the deposition electrode group B are connected with each other and are connected with the positive electrode of the direct current power supply, the upper parts of all the electrodes in the deposition electrode group A are connected with each other and are connected with the negative electrode of the direct current power supply, the current density and the duration are kept unchanged, and similarly, the group B promotes the scale layer deposited previously to fall off through an anode dissolution reaction; after descaling, the direct current power supply is stopped, and then the scale discharging valve 8 is opened to discharge scale.
Example (b):
total hardness and alkalinity of about 500mg/L (as CaCO)3Measured), circulating cooling water with the antisludging agent content of 2.0-3.0mg/L is treated by adopting the technology of the invention. The deposition electrodes are flat aluminum electrodes, the height is multiplied by the width, the thickness is multiplied by 180mm multiplied by 80mm multiplied by 3mm, and the number is 2; the DSA electrodes are in a net shape, the height is multiplied by the width, the thickness is multiplied by 180mm multiplied by 80mm multiplied by 1.7mm, and the number is 1; the net spacing between adjacent electrodes is 11 mm; the middle of the insulating spacer is provided with a hexagonal small hole with an inscribed circle of about 30mm, the thickness of the hexagonal small hole is 3mm, and the void ratio of the hexagonal small hole is about 85 percent. The operating conditions were as follows: the water temperature is 11-1The current density in the treatment stage is 100A/m at 5 DEG C2The treatment flow is 20-50L/h, the treatment time is 48h, the initial voltage is about 10.5V, and the voltage is about 11.5V when the treatment is about to end; the current density in the descaling stage is 100A/m2The single descaling time is 5 min. The run results were as follows: the total hardness removal rate is 7.2-12.9%; the DSA electrode has no damage; good descaling effect and no accumulation.

Claims (9)

1. A method for treating circulating cooling water by deposition electrode self-coupling inverse pole descale is characterized in that:
the flat-plate deposition electrode and the netlike DSA electrode are arranged in an interlaced way in an electrode area filled with circulating cooling water, and the two steps of treatment and descale are alternately operated:
during treatment, the deposition electrode is used as a cathode, the DSA electrode is used as an anode, the hardness and alkalinity are removed by utilizing the electrodeposition principle, and the generated hypochlorite is utilized to sterilize and algae-killing;
when in descaling, the DSA electrodes are not electrified, the deposition electrodes are mutually coupled in groups to descale in an inverted mode, and the descale is discharged after the descale.
2. The method for treating the circulating cooling water for the deposition electrode by the self-coupling inverse pole descale as claimed in claim 1, wherein the method comprises the following steps: during the treatment, the current density is controlled to be 30-200A/m2The duration is 20-100 h.
3. The method for treating the circulating cooling water for the deposition electrode by the self-coupling inverse pole descale as claimed in claim 1, wherein the method comprises the following steps:
the method for reverse electrode descaling through self-grouping mutual coupling of all the deposition electrodes specifically comprises the following steps:
all the deposition electrodes are numbered according to the arrangement position sequence, all the deposition electrodes with single numbers form a group A, all the deposition electrodes with double numbers form a group B, and then the following operations are carried out:
firstly, the group A is taken as an anode and the group B is taken as a cathode to be electrified once, the group A promotes the scale layer previously deposited on the group A to fall off through the anode dissolution reaction,
then, electrode reversing is carried out, the group B is used as an anode, the group A is used as a cathode, and electrifying operation is carried out once, and the group B promotes the scale layer previously deposited on the group B to fall off through an anode dissolution reaction;
and (4) after the descaling process is finished, removing scale.
4. The method for treating the circulating cooling water for the deposition electrode by the self-coupling inverse pole descaling method according to the claim 3, wherein the step of: during each electrifying operation during descaling, the current density is set to be 20-100A/m2For 2-20 min.
5. The method for treating the circulating cooling water for the deposition electrode by the self-coupling inverse pole descale as claimed in claim 1, wherein the method comprises the following steps: the method adopts an electrochemical device (1), a water inlet uniform distribution area (2), an electrode area (3) and a water outlet groove (4) are sequentially arranged in the electrochemical device (1) along the circulating cooling water flow direction, the water inlet uniform distribution area (2), the electrode area (3) and the water outlet groove (4) are sequentially communicated, a scale bucket (5) is arranged in the electrochemical device, and the bottoms of the water inlet uniform distribution area (2) and the electrode area (3) are communicated with the scale bucket (5); at least two deposition electrodes (9) and at least one DSA electrode (10) are arranged in parallel along the flow direction of circulating cooling water in the electrode area (3), and the deposition electrodes (9) and the DSA electrodes (10) are alternately arranged at intervals; all the deposition electrodes (9) are divided into a group A and a group B, the deposition electrodes (9) of the group A and the deposition electrodes (9) of the group B are alternately arranged, the upper parts of all the deposition electrodes (9) in the group A are electrically connected with each other, and the upper parts of all the deposition electrodes (9) in the group B are electrically connected with each other; the upper parts of all DSA electrodes (10) are electrically connected with each other.
6. The method for treating the circulating cooling water for the deposition electrode by the self-coupling inverse pole descaling method according to the claim 5, wherein the step of: the water inlet uniform distribution area (2) is provided with a water inlet valve (6), the water outlet groove (4) is provided with a water outlet pipe (7), and the bottom of the scale bucket (5) is provided with a scale discharge valve (8).
7. The method for treating the circulating cooling water for the deposition electrode by the self-coupling inverse pole descaling method according to the claim 5, wherein the step of: the water inlet uniform distribution area (2), the electrode area (3) and the water outlet groove (4) are provided with partition plates, the lower parts of the water inlet uniform distribution area (2) and the electrode area (3) are communicated, and the upper parts of the electrode area (3) and the water outlet groove (4) are communicated.
8. The method for treating the circulating cooling water for the deposition electrode by the self-coupling inverse pole descaling method according to the claim 5, wherein the step of: the two side surfaces of the DSA electrode (10) are respectively provided with an insulating separator with the void ratio exceeding 80%, and the DSA electrode (10) is clamped and fixed through the insulating separators at the two sides.
9. The method for treating the circulating cooling water for the deposition electrode by the self-coupling inverse pole descaling method according to the claim 5, wherein the step of: the deposition electrode (9) is made of plate-shaped metal materials such as aluminum, iron, carbon steel and the like which can generate anode autolysis reaction, and the thickness is 3-10 mm.
CN202111639580.5A 2021-12-29 2021-12-29 Method for treating circulating cooling water by deposition electrode self-coupling inverse pole descale Pending CN114249387A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111639580.5A CN114249387A (en) 2021-12-29 2021-12-29 Method for treating circulating cooling water by deposition electrode self-coupling inverse pole descale

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111639580.5A CN114249387A (en) 2021-12-29 2021-12-29 Method for treating circulating cooling water by deposition electrode self-coupling inverse pole descale

Publications (1)

Publication Number Publication Date
CN114249387A true CN114249387A (en) 2022-03-29

Family

ID=80795679

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202111639580.5A Pending CN114249387A (en) 2021-12-29 2021-12-29 Method for treating circulating cooling water by deposition electrode self-coupling inverse pole descale

Country Status (1)

Country Link
CN (1) CN114249387A (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013166255A1 (en) * 2012-05-03 2013-11-07 Tangent Company Llc Hardness reduction apparatus and method
CN203959890U (en) * 2014-07-11 2014-11-26 中国石油化工股份有限公司 The electrolytic oxidation wastewater treatment equipment of automatic desludging
CN206188462U (en) * 2016-10-27 2017-05-24 浙江大学苏州工业技术研究院 Automatic waste water electrolysis processing apparatus of scale removal
CN110937666A (en) * 2019-12-17 2020-03-31 中国科学院过程工程研究所 Anode protection type automatic descaling device for electrolyzing salt-containing organic wastewater

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013166255A1 (en) * 2012-05-03 2013-11-07 Tangent Company Llc Hardness reduction apparatus and method
CN203959890U (en) * 2014-07-11 2014-11-26 中国石油化工股份有限公司 The electrolytic oxidation wastewater treatment equipment of automatic desludging
CN206188462U (en) * 2016-10-27 2017-05-24 浙江大学苏州工业技术研究院 Automatic waste water electrolysis processing apparatus of scale removal
CN110937666A (en) * 2019-12-17 2020-03-31 中国科学院过程工程研究所 Anode protection type automatic descaling device for electrolyzing salt-containing organic wastewater

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
山西省电力工业局: "《火电生产类中级工培训教材 化学设备检修技术 试用本》", 30 June 1985, 北京：水利电力出版社 *
张开诚: "《普通高等教育"十三五"规划教材 化学实验教程》", 31 March 2018, 华中科技大学出版社 *
谢乃贤: "《电世界的奇葩》", 30 April 2012, 湖南教育出版社 *

Similar Documents

Publication Publication Date Title
CN102491456A (en) Method and device of electrochemical descaling, corrosion inhibition, sterilization and algae removal for cooling circulating water
CN211644716U (en) Rotary descaling device with functions of descaling, electrolysis, sterilization and descaling
CN104787842B (en) A kind of model electrochemical/photocatalysis circulating water cooling treatment equipment
WO2021143131A1 (en) Efficient electrochemical pre-scaling water treatment device
CN111689550A (en) Continuous sewage discharge and reuse industrial circulating water integral treatment system and process
CN105417645A (en) Cylindrical electrocatalytic oxidation reaction apparatus
CN112110577A (en) System and method for chlorine and scale removal by combining electrochemistry and ozone
CN106315870B (en) A kind of industrial circulating cooling water sterilization hardness removing device and processing method
JP2000140849A (en) Electrochemical water treating device and method
CN216549754U (en) Electrochemical device for treating circulating cooling water by deposited electrode self-coupling inverted-pole descale
CN111087051A (en) High-efficient type electrochemistry is scale deposit water treatment facilities in advance
CN114249387A (en) Method for treating circulating cooling water by deposition electrode self-coupling inverse pole descale
CN108455711B (en) Circulating water sterilization electrolysis descaling system
CN105060656B (en) Biochemical system auxiliary device and application thereof
CN110937666A (en) Anode protection type automatic descaling device for electrolyzing salt-containing organic wastewater
CN201770515U (en) Sewage purifying and descaling equipment adopting electrode adsorption and ultrasonic wave combination
CN108609748B (en) Ion membrane electrodeposition device and deposition method for softening treatment of circulating cooling water
CN206173053U (en) Combine electrochemistry of cation permselective membrane to remove hardness and disinfect water treatment facilities
CN212640038U (en) High-efficient type electrochemistry is scale deposit water treatment facilities in advance
CN104692494A (en) Electrolysis phosphorous removal device
CN201825793U (en) Electronic column structure for electrochemical water treatment device capable of stabilizing quality of circulating water
CN212476398U (en) Synchronous electrolytic nitrogen and phosphorus removal device
CN210764611U (en) Electrochemistry circulating cooling water purification installation
CN203613001U (en) Electrolytic catalytic oxidation device for online regeneration of catalyst
CN212476400U (en) Treatment device for circulating water high-concentration-ratio operation

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination