Electrochemical water treatment device and system for circulating water

Abstract

A circulating water electrochemical water treatment device, including main cylinder body, auxiliary cylinder body, cover body, water path control, gas path control, the water path control includes water inlet pipe, water inlet valve, water outlet pipe, water outlet valve, blowdown pipe, blowdown valve, the main cylinder body, auxiliary cylinder body, cover body constitute a sealed inner chamber, one end of the water inlet pipe is connected with the water inlet, one end of the water outlet pipe is connected with the water outlet, one end of the blowdown pipe is connected with the blowdown, the gas path control includes exhaust pipe, exhaust valve, one end of the exhaust pipe is connected with the exhaust port, the circulating water completes the electrochemical reaction in the main cylinder body, and forms the scaling in the main cylinder body, when the exhaust valve is opened, the compressed air in the auxiliary cylinder body is released instantaneously, and strong scouring force is formed on the scaling in the main cylinder body, part of the scaling is peeled off in advance, the application utilizes the auxiliary cylinder body to form compressed air, does not need external power, does not need additional energy consumption, and further provides a circulating water electrochemical water treatment system.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of industrial cooling water treatment, and particularly relates to a circulating water electrochemical water treatment device and system. BACKGROUND

[0002] Ningxia Jinyuhaichem Chemical Co., Ltd. has two sets of circulating water systems, and the circulating water circulation amount is 2000m 3 / h. After the circulating water is cooled by an evaporation tower, the concentration multiple reaches 3 times. After the circulating water is concentrated, the enrichment, such as calcium ions, easily causes the circulating water system to scale, the scaling reduces the heat exchange efficiency of the circulating water system, increases the production energy consumption, and affects the capacity play. In order to solve the problem of the circulating water system scaling, the prior art discloses an electrochemical method for removing scaling substances in water. For example, a kind of air scouring descaling electrochemical softening water system is disclosed in the authorized announcement CN206735976U. The system is connected in series by an electrochemical reactor and a sedimentation tank. Two steps are alternately operated. Water softening stage: hard water passes through the electrochemical reactor, direct current is used to promote water electrolysis, CaCO3 and Mg(OH)2 are generated and deposited on the cathode surface, and the hardness ions in the water are removed. Cathode descaling stage: water and compressed air are simultaneously introduced into the electrochemical reactor, and the shear force generated by the bubble breakage is used to descale the cathode. At the same time of descaling, the continuous flow of water in the electrochemical reactor is used to make the removed sediment discharge from the electrochemical reactor. However, the above-mentioned electrochemical softening water system needs to add compressed air to assist descaling, which increases the energy consumption. SUMMARY

[0003] Therefore, in view of the above problems, it is necessary to provide a circulating water electrochemical water treatment device.

[0004] It is also necessary to provide a circulating water electrochemical water treatment system.

[0005] The application discloses a circulating water electrochemical water treatment device, which comprises a main cylinder, an auxiliary cylinder, a cover, a water path control device and a gas path control device, wherein the water path control device comprises a water inlet pipe, a water inlet valve, a water outlet pipe, a water outlet valve, a sewage pipe and a sewage valve; the upper end of the main cylinder is open; the upper and lower ends of the auxiliary cylinder are open; the lower end of the auxiliary cylinder is coaxially arranged in the upper end of the main cylinder; the cover is arranged on the upper end of the auxiliary cylinder; the main cylinder, the auxiliary cylinder and the cover form a sealed inner cavity; a water inlet is arranged on the lower part of the side wall of the main cylinder; a water outlet is arranged on the upper part of the side wall of the main cylinder; a sewage outlet is arranged on the bottom wall of the main cylinder; a gas outlet is arranged on the upper part of the side wall of the auxiliary cylinder; one end of the water inlet pipe is connected with the water inlet; the water inlet valve is arranged on the water inlet pipe; one end of the water outlet pipe is connected with the water outlet; the water outlet valve is arranged on the water outlet pipe; one end of the sewage pipe is connected with the sewage outlet; the sewage valve is arranged on the sewage pipe; the gas path control device comprises a gas outlet pipe and a gas outlet valve; one end of the gas outlet pipe is connected with the gas outlet; and the gas outlet valve is arranged on the gas outlet pipe.

[0006] Preferably, the circulating water electrochemical water treatment device further comprises an anode cylinder and a cathode plate; the anode cylinder is arranged on the inner wall of the main cylinder; a plurality of cathode plates are suspended in the inner cavity of the main cylinder; and the plurality of cathode plates are uniformly distributed along the circumference of the main cylinder.

[0007] Preferably, the circulating water electrochemical water treatment device further comprises a direct-current power supply; one pole of the direct-current power supply is connected with the anode cylinder; and the other pole of the direct-current power supply is connected with the cathode plate.

[0008] Preferably, the circulating water electrochemical water treatment device further comprises a mud scraping assembly, which comprises a sealing cylinder, a first ring body, a driving shaft, a driving motor, and a first scraper; the sealing cylinder is open at both ends and is arranged in the main cylinder; the upper end of the sealing cylinder is coaxially arranged with the cover; the first ring body is arranged on the lower end of the sealing cylinder and is coaxially arranged with the sealing cylinder; the upper end surface of the first ring body is in abutment with the end surface of the sealing cylinder; the lower end surface of the first ring body is rotationally and sealingly connected with the bottom wall of the main cylinder; the lower end of the driving shaft extends downward through the cover and reaches close to the bottom wall of the main cylinder; the driving shaft is coaxially arranged with the sealing cylinder; the upper end of the driving shaft is in transmission connection with the output shaft of the driving motor; the lower end of the driving shaft is coaxially connected with the first ring body; the first scraper is a flat and long plate; the lower end of the first scraper is connected with the upper end surface of the first ring body; the upper end of the first ring body extends upward; the outer side wall of the first scraper is in contact with the inner side wall of the cathode plate; and a plurality of first scrapers are uniformly distributed along the circumference of the first ring body.

[0009] Preferably, the mud scraping assembly further comprises a second ring body, a second scraper, the second ring body is coaxially arranged with the first ring body, the diameter of the second ring body is larger than that of the first ring body, the second ring body is at the same horizontal height with the first ring body, the first ring body is connected with the second ring body, the lower end of the second scraper is connected with the upper end surface of the second ring body, the upper end of the second scraper extends upward, the inner side wall of the second scraper is in contact with the outer side wall of the cathode plate, and the second scraper is a plurality of second scrapers which are uniformly distributed along the circumference of the second ring body.

[0010] Preferably, the mud scraping assembly further comprises a third scraper, one end of the third scraper is connected with the first ring body, the other end of the third scraper is connected with the second ring body, the bottom surface of the third scraper is in contact with the bottom wall of the main cylinder body, the third scraper is a plurality of third scrapers which are uniformly distributed along the circumference of the first ring body and the second ring body, and the blowdown port is located between the first ring body and the second ring body.

[0011] Preferably, the mud scraping assembly further comprises a third ring body, the diameter of the third ring body is consistent with that of the second ring body, the third ring body is coaxially arranged with the second ring body, the second scraper is connected with the third ring body, and the third ring body is a plurality of third ring bodies which are uniformly distributed along the height direction of the second scraper.

[0012] Preferably, the mud scraping assembly further comprises a fourth ring body, the diameter of the fourth ring body is consistent with that of the first ring body, the fourth ring body is coaxially arranged with the first ring body, the first scraper is connected with the fourth ring body, and the fourth ring body is a plurality of fourth ring bodies which are uniformly distributed along the height direction of the second scraper.

[0013] A circulating water electrochemical water treatment system comprises a water feeding pump, a collecting pool and a circulating water electrochemical water treatment device, the inlet of the water feeding pump is connected with the outlet of the water collecting groove of the evaporation tower, the outlet of the water feeding pump is connected with the other end of the water inlet pipe, the other end of the water outlet pipe is connected with the inlet of the spraying pipe of the evaporation tower, and the other end of the blowdown pipe is connected with the inlet of the collecting pool.

[0014] Compared with the prior art, the beneficial effects of the present application are that:

[0015] After the circulating water completes the electrochemical reaction in the main cylinder body, scale is formed in the main cylinder body, when the exhaust valve is opened, the compressed air in the auxiliary cylinder body is instantaneously released, a strong scouring force is formed on the scale in the main cylinder body, and part of the scale is peeled off in advance, the auxiliary cylinder body is used to form compressed air in the present application, no external power is needed, and no additional energy is consumed. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a structural schematic view of the circulating water electrochemical water treatment device.

[0017] Figure 2Axonometric view of the first state of the circulating water electrochemical water treatment device.

[0018] Figure 3 Axonometric view of the second state of the circulating water electrochemical water treatment device.

[0019] Figure 4 Axonometric view of the mud scraping assembly.

[0020] Figure 5 Structural schematic view of the circulating water electrochemical water treatment system.

[0021] Figure 6 Structural schematic view of a variant of the circulating water electrochemical water treatment device.

[0022] In the figure: circulating water electrochemical water treatment device 10, main cylinder body 11, anode cylinder 12, cathode plate 13, cover body 14, mud scraping assembly 15, sealing cylinder 151, first ring body 152, drive shaft 153, drive motor 154, first scraper 155, second ring body 156, second scraper 157, third scraper 158, third ring body 159, fourth ring body 1510, auxiliary cylinder body 16, inner cylinder body 161, outer cylinder body 162, water path control 17, water inlet pipe 171, water inlet valve 172, water outlet pipe 173, water outlet valve 174, sewage pipe 175, sewage valve 176, gas path control 18, exhaust pipe 181, exhaust valve 182, water delivery pump 20, collection pool 30, evaporation tower 40, axial flow fan 41, spray pipe 42, filler 43, water accumulation tank 44. DETAILED DESCRIPTION

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings described in the following are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained according to these drawings without creative labor.

[0024] Referring to Figure 1The embodiment of the present application provides a circulating water electrochemical water treatment device 10, which comprises a main cylinder body 11, an auxiliary cylinder body 16, a cover body 14, a water path control 17 and a gas path control 18, the water path control 17 comprises a water inlet pipe 171, a water inlet valve 172, a water outlet pipe 173, a water outlet valve 174, a blowdown pipe 175 and a blowdown valve 176, the upper end of the main cylinder body 11 is open, the upper and lower ends of the auxiliary cylinder body 16 are open, the lower end of the auxiliary cylinder body 16 is coaxially arranged at the upper end of the main cylinder body 11, the cover body 14 covers the upper end of the auxiliary cylinder body 16, the main cylinder body 11, the auxiliary cylinder body 16 and the cover body 14 form a sealed inner cavity, a water inlet is arranged at the lower part of the side wall of the main cylinder body 11, a water outlet is arranged at the upper part of the side wall of the main cylinder body 11, a blowdown port is arranged on the bottom wall of the main cylinder body 11, and a gas outlet is arranged at the upper part of the side wall of the auxiliary cylinder body 16, one end of the water inlet pipe 171 is connected with the water inlet, the water inlet valve 172 is arranged on the water inlet pipe 171, one end of the water outlet pipe 173 is connected with the water outlet, the water outlet valve 174 is arranged on the water outlet pipe 173, one end of the blowdown pipe 175 is connected with the blowdown port, and the blowdown valve 176 is arranged on the blowdown pipe 175, the gas path control 18 comprises a gas discharge pipe 181 and a gas discharge valve 182, one end of the gas discharge pipe 181 is connected with the gas outlet, and the gas discharge valve 182 is arranged on the gas discharge pipe 181.

[0025] In one embodiment, the internal structure of the main cylinder body 11 can be the same as that of the air flushing descaling electrochemical softening water system disclosed in the authorized announcement CN206735976U.

[0026] The auxiliary cylinder body 16 is used for forming compressed air, in one case, the water inlet valve 172 is opened, the water outlet valve 174 is opened, the circulating water continuously enters the main cylinder body 11 from the water inlet pipe 171 and flows out of the main cylinder body 11 from the water outlet pipe 173, compressed air is gradually formed in the auxiliary cylinder body 16, and the pressure of the compressed air is equal to the water pressure of the water inlet pipe 171.

[0027] Compared with the prior art, the present application has the following beneficial effects:

[0028] After the circulating water completes the electrochemical reaction in the main cylinder body 11, scale is formed in the main cylinder body 11, when the gas discharge valve 182 is opened, the compressed air in the auxiliary cylinder body 16 is instantaneously released, a strong flushing force is formed on the scale in the main cylinder body 11, and part of the scale is peeled off in advance, the present application utilizes the auxiliary cylinder body 16 to form compressed air, and no external power and additional energy consumption are needed.

[0029] Referring to Figures 2 to 4 Further, the circulating water electrochemical water treatment device 10 further comprises an anode cylinder 12 and a cathode plate 13, the anode cylinder 12 is the inner wall of the main cylinder body 11, a plurality of cathode plates 13 are suspended in the inner cavity of the main cylinder body 11, and the plurality of cathode plates 13 are uniformly distributed along the circumference of the main cylinder body 11.

[0030] Referring to Figures 2 to 4 Further, the circulating water electrochemical water treatment device 10 further comprises a direct current power supply, one pole of the direct current power supply is connected with the anode cylinder 12, and the other pole of the direct current power supply is connected with the cathode plate 13.

[0031] Referring to Figures 2 to 4 Further, the circulating water electrochemical water treatment device 10 further comprises a mud scraping assembly 15, the mud scraping assembly 15 comprises a sealing cylinder 151, a first ring body 152, a driving shaft 153, a driving motor 154, and first scrapers 155, the sealing cylinder 151 is open at both ends and is built in the main cylinder body 11, the upper end of the sealing cylinder 151 is coaxially arranged with the cover body 14, the first ring body 152 is arranged at the lower end of the sealing cylinder 151, the first ring body 152 is coaxially arranged with the sealing cylinder 151, the upper end surface of the first ring body 152 is in abutment with the end surface of the sealing cylinder 151, and the lower end surface of the first ring body 152 is rotationally and sealingly connected with the bottom wall of the main cylinder body 11, the lower end of the driving shaft 153 extends downward through the cover body 14 to be close to the bottom wall of the main cylinder body 11, the driving shaft 153 is coaxially arranged with the sealing cylinder 151, the upper end of the driving shaft 153 is in transmission connection with the output shaft of the driving motor 154, and the lower end of the driving shaft 153 is coaxially connected with the first ring body 152, the first scrapers 155 are flat and long plates, the lower end of each first scraper 155 is connected with the upper end surface of the first ring body 152, the upper end of the first ring body 152 extends upward, the outer side wall of each first scraper 155 is in contact with the inner side wall of the cathode plate 13, and a plurality of first scrapers 155 are uniformly distributed along the circumference of the first ring body 152. The driving shaft 153 is arranged in the sealing cylinder 151 to avoid contact with the circulating water, which helps to prolong the service life.

[0032] Referring to Figures 2 to 4 Further, the mud scraping assembly 15 further comprises a second ring body 156 and second scrapers 157, the second ring body 156 is coaxially arranged with the first ring body 152, the diameter of the second ring body 156 is greater than that of the first ring body 152, the second ring body 156 is at the same horizontal height as the first ring body 152, the first ring body 152 is connected with the second ring body 156, the lower end of each second scraper 157 is connected with the upper end surface of the second ring body 156, the upper end of each second scraper 157 extends upward, the inner side wall of each second scraper 157 is in contact with the outer side wall of the cathode plate 13, and a plurality of second scrapers 157 are uniformly distributed along the circumference of the second ring body 156.

[0033] Referring to Figures 2 to 4Further, the mud scraping assembly 15 further comprises a third scraper 158, one end of the third scraper 158 is connected with the first ring body 152, the other end of the third scraper 158 is connected with the second ring body 156, the bottom surface of the third scraper 158 is in contact with the bottom wall of the main cylinder body 11, the third scraper 158 is a plurality of, the plurality of third scrapers 158 are uniformly distributed along the circumferential direction of the first ring body 152 and the second ring body 156, and the sludge outlet is located between the first ring body 152 and the second ring body 156.

[0034] Referring to Figures 2 to 4 Further, the mud scraping assembly 15 further comprises a third ring body 159, the third ring body 159 is consistent with the diameter of the second ring body 156, the third ring body 159 is coaxially arranged with the second ring body 156, the second scraper 157 is connected with the third ring body 159, and the third ring body 159 is a plurality of, the plurality of third ring bodies 159 are uniformly distributed along the height direction of the second scraper 157.

[0035] Referring to Figures 2 to 4 Further, the mud scraping assembly 15 further comprises a fourth ring body 1510, the fourth ring body 1510 is consistent with the diameter of the first ring body 152, the fourth ring body 1510 is coaxially arranged with the first ring body 152, the first scraper 155 is connected with the fourth ring body 1510, and the fourth ring body 1510 is a plurality of, the plurality of fourth ring bodies 1510 are uniformly distributed along the height direction of the second scraper 157.

[0036] It should be noted that the inner side wall surface of the cathode plate 13 faces the sealing cylinder 151, the outer side wall surface of the cathode plate 13 faces the inner wall of the cylinder body, the inner side wall surface of the first scraper 155 faces the sealing cylinder 151, the outer side wall surface of the first scraper 155 faces the inner wall of the cylinder body, the inner side wall surface of the second scraper 157 faces the sealing cylinder 151, the outer side wall surface of the second scraper 157 faces the inner wall of the cylinder body, the outer side wall surface of the first scraper 155 is the blade end surface, the inner side wall surface of the second scraper 157 is the blade end surface, in the rotating process of the first scraper 155, the blade end surface of the first scraper 155 slides along the inner side wall of the cathode plate 13, in the rotating process of the second scraper 157, the blade end surface of the second scraper 157 slides along the outer side wall of the cathode plate 13, referring to Figure 2 The second scraper 157 and the first scraper 155 are in the first state when they are in contact with the cathode plate 13, referring to Figure 3 The second scraper 157 and the first scraper 155 are in the second state when they are not in contact with the cathode plate 13, the bottom surface of the third scraper 158 is the blade end surface, and the blade end surface of the third scraper 158 is in contact with the bottom wall of the cylinder body.

[0037] The third scraper 158, the first ring body 152 and the second ring body 156 form a plurality of mud scraping rings, the mud is driven to the sludge outlet by the mud scraping rings, the mud is constrained in the mud scraping rings, is deflected in the mud scraping rings, and is more easily flowed out of the sludge outlet.

[0038] The main cylinder body 11, the auxiliary cylinder body 16, the cover body 14, the sealing cylinder 151, the first ring body 152, the first scraper 155, the second ring body 156, the second scraper 157, the third ring body 159, the third scraper 158 and the fourth ring body 1510 are made of insulating materials.

[0039] Referring to Figure 5 The embodiment of the present application provides a circulating water electrochemical water treatment system, which comprises a water feeding pump 20, a collecting pool 30 and a circulating water electrochemical water treatment device 10. The inlet of the water feeding pump 20 is connected with the outlet of a water collecting groove 44 of an evaporation tower 40. The outlet of the water feeding pump 20 is connected with the other end of a water inlet pipe 171. The other end of a water outlet pipe 173 is connected with the inlet of a spraying pipe 42 of the evaporation tower 40. The other end of a blowdown pipe 175 is connected with the inlet of the collecting pool 30.

[0040] In one embodiment, the circulating water electrochemical water treatment system is used for removing enriched calcium ions in circulating water of the evaporation tower 40. The evaporation tower 40 has a common structure. The top of the evaporation tower 40 is provided with an axial flow fan 41. The middle upper part of the evaporation tower 40 is provided with the spraying pipe 42. The middle lower part of the evaporation tower 40 is provided with a filler 43. The bottom of the evaporation tower 40 is provided with the water collecting groove 44.

[0041] Referring to Figure 6 In one embodiment, the auxiliary cylinder body 16 has a variable volume structure. For example, the auxiliary cylinder body 16 is divided into an inner cylinder body 161 and an outer cylinder body 162. The inner cylinder body 161 and the outer cylinder body 162 are nested with each other. The outer diameter of the inner cylinder body 161 is equal to the inner diameter of the outer cylinder body 162. A lower pull plate is arranged on the inner cylinder body 161. An upper pull plate is arranged on the outer cylinder body 162. A lower screw hole is arranged on the lower pull plate. An upper screw hole is arranged on the upper pull plate. A connecting screw rod passes through the lower screw hole and the upper screw hole respectively. The two ends of the connecting screw rod are screwed into an upper nut and a lower nut respectively to adjust the volume of the auxiliary cylinder body 16. The upper end of the sealing cylinder 151 is rotationally connected with the cover body 14 through a flexible connection.

[0042] In one embodiment, the control cathode plate 13 generates gas by electrochemical reaction with circulating water to increase the air pressure in the auxiliary cylinder body 16.

[0043] The embodiment of the present application provides a circulating water electrochemical water treatment method based on the circulating water electrochemical water treatment system, which comprises the following steps.

[0044] Step one: open the water inlet valve 172, open the water outlet valve 174 and close the exhaust valve 182;

[0045] Step two: start the water feeding pump 20 to make the circulating water in the water collecting groove of the evaporation tower 40 pass through the main cylinder body 11 and then enter the spraying pipe 42 of the evaporation tower 40 to form a circulation and form compressed air in the auxiliary cylinder body 16;

[0046] Step three: open the DC power supply, form calcium carbonate scale on the cathode plate 13, and produce carbon dioxide gas on the anode cylinder 12.

[0047] Further, the electrochemical water treatment method of circulating water further comprises the following steps:

[0048] Step four: when the calcium carbonate scale on the cathode plate 13 reaches a predetermined thickness, open the exhaust valve 182, and the gas discharged by the exhaust valve 182 shakes off the calcium carbonate scale on the cathode plate 13;

[0049] Step five: close the exhaust valve 182 and open the blowdown valve 176.

[0050] Step six: when the liquid level in the main cylinder 11 drops to the same level as in step two, close the blowdown valve 176.

[0051] The predetermined thickness is determined according to actual use, for example, 5mm, 10mm, etc.

[0052] Further, in step two, the exhaust valve 182 is opened, so that the pressure of the compressed air in the auxiliary cylinder 16 is maintained at 0.1MPa, and then the exhaust valve 182 is closed.

[0053] Electrochemical reaction principle: cathode area (around the cathode plate 13): H2O electrolysis generates OH - , forming a strong alkaline environment with pH≈13 in the cathode area, in which HCO3 - reacts with OH - to generate CO3 2- , and CO3 2- rapidly combines with Ca 2+ and Mg 2+ to generate scale (CaCO3, MgCO3). Anode area (around the anode cylinder 12): H2O electrolysis generates O2 and H + , and under the pressure of 0.1MPa, O2 contacts with water to generate H2O2, and H + forms a strong acidic environment with pH≈3 in the anode area, in which H2O2 is extremely unstable and will decompose into two ·OH, and the generated O2 is electrolyzed into free oxygen atoms under the action of micro-discharge between the anode cylinder 12 and the cathode plate 13, and the free oxygen atoms combine with O2 to generate O3. H2O2, ·OH, and O3 have extremely strong oxidizing properties, and can oxidize bacteria and algae into CO2 and H2O. At the same time, 50%-70% of Cl - in the circulating water is electrolyzed into Cl2, Cl2 dissolves in water to generate HClO, and ClO - is an effective component of commonly used bactericides, and the two work together to ensure the bactericidal effect of the circulating water system.

[0054] The steps in the method of the embodiments of the present application can be adjusted in sequence, combined and reduced according to actual needs.

[0055] The modules or units in the device of the embodiments of the present application can be combined, divided, and reduced according to actual needs.

[0056] The above only discloses the preferred embodiments of the present application, and of course cannot limit the scope of the rights of the present application, and those skilled in the art can understand that all or part of the above-mentioned embodiments are implemented, and equivalent changes made according to the claims of the present application still belong to the scope covered by the present application.

Claims

1. A circulating water electrochemical water treatment device, characterized by: The application relates to a circulating water electrochemical water treatment device, which comprises a main cylinder body, an auxiliary cylinder body, a cover body, a water path control device and a gas path control device, the water path control device comprises a water inlet pipe, a water inlet valve, a water outlet pipe, a water outlet valve, a sewage pipe and a sewage valve, the upper end of the main cylinder body is open, the upper and lower ends of the auxiliary cylinder body are open, the lower end of the auxiliary cylinder body is coaxially arranged at the upper end of the main cylinder body, the cover body covers the upper end of the auxiliary cylinder body, the main cylinder body, the auxiliary cylinder body and the cover body form a sealed inner cavity, a water inlet is arranged at the lower part of the side wall of the main cylinder body, a water outlet is arranged at the upper part of the side wall of the main cylinder body, a sewage outlet is arranged on the bottom wall of the main cylinder body, a gas outlet is arranged at the upper part of the side wall of the auxiliary cylinder body, one end of the water inlet pipe is connected with the water inlet, a water inlet valve is arranged on the water inlet pipe, one end of the water outlet pipe is connected with the water outlet, a water outlet valve is arranged on the water outlet pipe, one end of the sewage pipe is connected with the sewage outlet, and a sewage valve is arranged on the sewage pipe, the gas path control device comprises a gas outlet pipe and a gas outlet valve, one end of the gas outlet pipe is connected with the gas outlet, and a gas outlet valve is arranged on the gas outlet pipe; wherein the auxiliary cylinder body is a variable-volume structure, the auxiliary cylinder body is divided into an inner cylinder body and an outer cylinder body, the inner cylinder body and the outer cylinder body are nested with each other, the outer diameter of the inner cylinder body is equal to the inner diameter of the outer cylinder body, a lower pull plate is arranged on the inner cylinder body, an upper pull plate is arranged on the outer cylinder body, a lower screw hole is arranged on the lower pull plate, an upper screw hole is arranged on the upper pull plate, a connecting screw rod passes through the lower screw hole and the upper screw hole respectively, and the two ends of the connecting screw rod are screwed into upper and lower nuts respectively to adjust the volume of the auxiliary cylinder body; the upper end of a sealing cylinder is rotationally connected with the cover body through a flexible connection; the circulating water electrochemical water treatment device further comprises an anode cylinder, a cathode plate and a direct-current power supply; and the device is used to complete descaling through the following steps: Step one: opening the water inlet valve, opening the water outlet valve and closing the gas outlet valve; Step two: starting a water pump to make circulating water in a water collecting tank of an evaporation tower form a cycle after passing through the main cylinder body and then entering the spraying pipe of the evaporation tower to form compressed air in the auxiliary cylinder body; Step three: opening the direct-current power supply to form calcium carbonate scaling on the cathode plate and produce carbon dioxide gas on the anode cylinder; Step four: when the calcium carbonate scaling on the cathode plate reaches a predetermined thickness, opening the gas outlet valve, and the gas discharged by the gas outlet valve shaking off the calcium carbonate scaling on the cathode plate; Step five: closing the gas outlet valve and opening the sewage valve; Step six: when the liquid level in the main cylinder body drops to the same level as that in step two, closing the sewage valve. The anode cylinder is the inner wall of the main cylinder body, a plurality of cathode plates are hung in the inner cavity of the main cylinder body, and the cathode plates are uniformly distributed along the circumference of the main cylinder body. One pole of the direct-current power supply is connected with the anode cylinder, and the other pole of the direct-current power supply is connected with the cathode plate. ​ 2. The electro-chemical water treatment apparatus of claim 1, wherein: ​ 3. The electro-chemical water treatment apparatus of claim 2, wherein: ​ 4. The electro-chemical water treatment apparatus of claim 2, wherein: The circulating water electrochemical water treatment device further comprises a mud scraping assembly, the mud scraping assembly comprises a sealing cylinder, a first ring body, a driving shaft, a driving motor, a first scraper, the sealing cylinder is open at both ends, the sealing cylinder is built in the main cylinder body, the upper end of the sealing cylinder is coaxially arranged with the cover body, the first ring body is arranged at the lower end of the sealing cylinder, the first ring body is coaxially arranged with the sealing cylinder, the upper end surface of the first ring body is in abutment with the end surface of the sealing cylinder, the lower end surface of the first ring body is rotationally and sealingly connected with the bottom wall of the main cylinder body, the lower end of the driving shaft extends downward through the cover body to be close to the bottom wall of the main cylinder body, the driving shaft is coaxially arranged with the sealing cylinder, the upper end of the driving shaft is in transmission connection with the output shaft of the driving motor, the lower end of the driving shaft is coaxially connected with the first ring body, the first scraper is a flat and long plate, the lower end of the first scraper is connected with the upper end surface of the first ring body, the upper end of the first ring body extends upward, the outer side wall of the first scraper is in contact with the inner side wall of the cathode plate, and the first scraper is a plurality of first scrapers which are uniformly distributed along the circumference of the first ring body.

5. The electro-chemical water treatment apparatus of claim 4, wherein: The mud scraping assembly further comprises a second ring body and a second scraper, the second ring body is coaxially arranged with the first ring body, the diameter of the second ring body is greater than that of the first ring body, the second ring body is at the same horizontal height as the first ring body, the first ring body is connected with the second ring body, the lower end of the second scraper is connected with the upper end surface of the second ring body, the upper end of the second scraper extends upward, the inner side wall of the second scraper is in contact with the outer side wall of the cathode plate, and the second scraper is a plurality of second scrapers which are uniformly distributed along the circumference of the second ring body.

6. The electro-chemical water treatment apparatus of claim 5, wherein: The mud scraping assembly further comprises a third scraper, one end of the third scraper is connected with the first ring body, the other end of the third scraper is connected with the second ring body, the bottom surface of the third scraper is in contact with the bottom wall of the main cylinder body, the third scraper is a plurality of third scrapers which are uniformly distributed along the circumferences of the first ring body and the second ring body, and the blowdown port is located between the first ring body and the second ring body.

7. The electro-chemical water treatment apparatus of claim 6, wherein: the cathode is a titanium plate coated with platinum; the anode is a titanium plate coated with ruthenium; and the electrolyte is sodium chloride. The mud scraping assembly further comprises a third ring body, the diameter of the third ring body is consistent with that of the second ring body, the third ring body is coaxially arranged with the second ring body, the second scraper is connected with the third ring body, and the third ring body is a plurality of third ring bodies which are uniformly distributed along the height direction of the second scraper.

8. The electro-chemical water treatment apparatus of claim 7, wherein: the cathode is a titanium plate coated with platinum; the anode is a titanium plate coated with ruthenium; and the electrolyte is sodium chloride. The mud scraping assembly further comprises a fourth ring body, the diameter of the fourth ring body is consistent with that of the first ring body, the fourth ring body is coaxially arranged with the first ring body, the first scraper is connected with the fourth ring body, and the fourth ring body is a plurality of fourth ring bodies which are uniformly distributed along the height direction of the second scraper.

9. A circulating water electro-chemical water treatment system characterized by: The circulating water electrochemical water treatment device comprises a water feeding pump, a collecting pool and the circulating water electrochemical water treatment device according to any one of claims 1 to 8, the inlet of the water feeding pump is connected with the outlet of the water collecting groove of the evaporation tower, the outlet of the water feeding pump is connected with the other end of the water inlet pipe, the other end of the water outlet pipe is connected with the inlet of the spraying pipe of the evaporation tower, and the other end of the blowdown pipe is connected with the inlet of the collecting pool.

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