CN210261239U - Two-section type electrochemical water treatment system for descaling and dechlorinating - Google Patents
Two-section type electrochemical water treatment system for descaling and dechlorinating Download PDFInfo
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- CN210261239U CN210261239U CN201921089664.4U CN201921089664U CN210261239U CN 210261239 U CN210261239 U CN 210261239U CN 201921089664 U CN201921089664 U CN 201921089664U CN 210261239 U CN210261239 U CN 210261239U
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- dechlorination
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 133
- 230000000382 dechlorinating effect Effects 0.000 title claims abstract description 15
- 238000006298 dechlorination reaction Methods 0.000 claims abstract description 65
- 238000007790 scraping Methods 0.000 claims description 23
- 239000000523 sample Substances 0.000 claims description 22
- 229910044991 metal oxide Inorganic materials 0.000 claims description 16
- 150000004706 metal oxides Chemical class 0.000 claims description 16
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 10
- 150000002500 ions Chemical class 0.000 claims description 9
- 230000001276 controlling effect Effects 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 229910052759 nickel Inorganic materials 0.000 claims description 5
- 239000010935 stainless steel Substances 0.000 claims description 5
- 229910001220 stainless steel Inorganic materials 0.000 claims description 5
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 3
- 239000010962 carbon steel Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 14
- 230000000694 effects Effects 0.000 abstract description 7
- 230000005518 electrochemistry Effects 0.000 abstract description 6
- 230000011218 segmentation Effects 0.000 abstract description 5
- 238000003487 electrochemical reaction Methods 0.000 abstract description 4
- 239000010865 sewage Substances 0.000 description 14
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 12
- 239000000126 substance Substances 0.000 description 7
- 230000007797 corrosion Effects 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000002131 composite material Substances 0.000 description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical group [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 3
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 3
- 229910052791 calcium Inorganic materials 0.000 description 3
- 239000011575 calcium Substances 0.000 description 3
- 239000000460 chlorine Substances 0.000 description 3
- 229910052801 chlorine Inorganic materials 0.000 description 3
- 239000003814 drug Substances 0.000 description 3
- 229910052749 magnesium Inorganic materials 0.000 description 3
- 239000011777 magnesium Substances 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 238000005554 pickling Methods 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 238000005536 corrosion prevention Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000002848 electrochemical method Methods 0.000 description 2
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- 230000003647 oxidation Effects 0.000 description 2
- 238000002161 passivation Methods 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 238000001223 reverse osmosis Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 1
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000010405 anode material Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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Abstract
The utility model provides a two segmentation electrochemical water treatment systems for scale removal and dechlorination, including scale removal unit and dechlorination unit, wherein, the inlet tube of pending raw water is connected to the water inlet of scale removal unit, the water outlet of scale removal unit is connected the water inlet of dechlorination unit, the water outlet of dechlorination unit is connected the outlet pipe; the utility model discloses according to the different principles and the technological characteristics of scale removal and dechlorination, divide into scale removal section and dechlorination section with electrochemistry water treatment process, the structural design of every section is different: the descaling section is of a structure of large cathode and small anode, the dechlorinating section is of a structure of large anode and short polar plate interval, so that the electrochemical reaction efficiency of descaling and dechlorinating is optimal, and the order of descaling first and dechlorinating later can also achieve better comprehensive effect in practice.
Description
Technical Field
The utility model relates to an electrochemical water treatment method, in particular to a two-section type electrochemical water treatment system for descaling and dechlorination.
Background
The enrichment and deposition of calcium, magnesium, alkalinity and other scaling ions in water can cause scaling of pipelines and wall surfaces, chloride ions can cause corrosion of pipes, the process cost is increased, and serious safety accidents can be caused in serious cases. The problems of scaling and corrosion are common and often simultaneous in many fields such as industrial water, domestic hot-grid circulating water systems, etc.
The electrochemical method is a novel method for solving the scaling and corrosion, and has the advantages of green, mild process, reduction of chemical agents and no secondary pollution. However, due to the different principles of electrochemical descaling and corrosion prevention, the general electrochemical method often fails to achieve the best comprehensive benefits of descaling and corrosion prevention, especially the poor effect of chlorine removal. The principle of electrochemical descaling is that OH is generated by cathode reaction-And CO3 2-And the calcium ions and the magnesium ions are combined into precipitates which are electrostatically attracted to the vicinity of the cathode, and the precipitates attached to the surface of the cathode are removed by mechanical or reverse steps. Therefore, the descaling reaction requires an efficient cathode, a more alkaline environment, and sufficient descaling space. Dechlorination, however, is accomplished by anodic oxidation of chloride ions, requiring efficient anodes, a more acidic environment, and a smaller electrode spacing to reduce resistance. Thus, the scale removal and dechlorination requirements are in some ways contradictory, resulting in the difficulty of achieving the best overall results for a simple single-stage electrochemical water treatment.
Disclosure of Invention
The utility model provides a pair of two segmentation electrochemistry water treatment systems for scale removal and dechlorination has solved current electrochemistry water treatment for scale removal and dechlorination and has existed and can not combine scale removal and dechlorination to reach the defect of best composite effect.
In order to achieve the above purpose, the utility model discloses a technical scheme is:
the utility model provides a two segmentation electrochemical water treatment systems for scale removal and dechlorination, including scale removal unit and dechlorination unit, wherein, the inlet tube of pending raw water is connected to the water inlet of scale removal unit, the water outlet of scale removal unit is connected the water inlet of dechlorination unit, the water outlet of dechlorination unit is connected the outlet pipe;
the descaling unit is of a cylindrical structure and comprises a first anode, a first cathode, a first shell, a descaling device and a first electric control element, wherein the first anode is of a cylindrical structure and is positioned in the center of the first shell with the cylindrical structure, and the first cathode is of a cylindrical structure and is sleeved in the first shell and is arranged between the first anode and the first shell; the scale scraping device is arranged on the outer side of the first cathode; the first electric control element is respectively connected with the first anode and the first cathode;
the dechlorination unit comprises N second anodes, N second cathodes, a second shell and a second electric control element, wherein the number of the second anodes is N, the number of the second cathodes is N +1, the second anodes and the second cathodes are alternately arranged in an inner cavity of the second shell, and the second electric control element is respectively connected with the second anodes and the second cathodes.
Preferably, the scale scraping device comprises a motor, two circular fixed guide rails and a rod-shaped scraper, wherein the two circular fixed guide rails are respectively fixed at two ends of the first cathode; the both ends and the circular fixed guide rail sliding connection of bar-shaped scraper, bar-shaped scraper passes through the pivot with the motor and is connected, drives bar-shaped scraper along the surface motion of circular fixed guide rail through first negative pole through the motor for strike off first negative pole surface scaling.
Preferably, the first electric control element comprises a power supply, a numerical control system and a water quality probe, wherein the power supply supplies power to the cathode and the anode, the numerical control system and the water quality probe, the water quality probe is used for collecting hardness ions and LSI/RSI indexes in water and transmitting the collected data to the numerical control system, the numerical control system compares the received data with a set threshold value, and outputs a command for regulating and controlling the current and the voltage of the first anode and the first cathode according to the comparison result.
Preferably, the first anode is one or more of Ru metal oxide, Ir metal oxide, Sn metal oxide, Sb metal oxide, and Ti metal oxide.
Preferably, the first cathode is stainless steel, carbon steel or nickel.
Preferably, the descaling unit is a plate-type structure, in particular: the first anodes and the first cathodes are of flat plate structures with equal areas, wherein the number of the first anodes is N, the number of the first cathodes is N +1, and the first anodes and the first cathodes are alternately arranged in the inner cavity of the first shell; the number of the scale scraping devices is N +1, and each scale scraping device is correspondingly arranged on the outer side of one first cathode and used for scraping scales on the surface of the cathode.
Preferably, the distance between two adjacent first anodes and first cathodes is 3-10 cm.
Preferably, the second anode and the second cathode are both flat plate structures and have equal areas; the distance between two adjacent second anodes and second cathodes is less than or equal to 5 mm.
Preferably, the second electric control element comprises a power supply, a numerical control system and a water quality probe, wherein the power supply supplies power to the numerical control system and the water quality probe, the water quality probe is used for collecting hardness ions and LSI/RSI indexes in water and transmitting the collected data to the numerical control system, the numerical control system compares the received data with a set threshold value and outputs a command for regulating and controlling the current and the voltage of the second anode and the second cathode according to the comparison result.
Preferably, the volume ratio of the descaling unit to the dechlorination unit is (6-8): 1.
compared with the prior art, the beneficial effects of the utility model are that:
the utility model provides a pair of two segmentation electrochemistry water treatment systems for scale removal and dechlorination, the utility model discloses according to the different principles and the technological characteristics of scale removal and dechlorination, divide into scale removal section and dechlorination section with electrochemistry water treatment process, the structural design of every section is different: the descaling section is of a structure of large cathode and small anode, the dechlorinating section is of a structure of large anode and short polar plate interval, so that the electrochemical reaction efficiency of descaling and dechlorinating is optimal, and the order of descaling first and dechlorinating later can also achieve better comprehensive effect in practice.
Further, the tubular structure and the plate-type structure of scraping dirty unit can be applicable to different user demands respectively: the cylindrical structure is convenient for realizing automatic descaling, but has larger occupied area, and can be applied to the environment with abundant space and higher requirement on the automation degree of the process; the plate type structure can adopt an automatic descaling or manual descaling mode, has small occupied area, and can be applied to the environment with tense land and low requirement on the automation degree of the process.
Furthermore, the distance between the two adjacent first anodes and the first cathodes is 3-10cm, so that sufficient space is provided for the generation and scraping of a scale layer, the scale removal operation is convenient to carry out, and the phenomenon that scaling substances block the channels between the polar plates is avoided.
Furthermore, the distance between two adjacent second anodes and the second cathode is less than or equal to 5mm, the resistance between the electrode plates can be effectively reduced, the electrochemical reaction efficiency is improved, and the overall energy efficiency of the device can be greatly improved due to the fact that the dechlorination reaction is a high-energy-consumption reaction.
Further, the volume ratio of the descaling unit to the dechlorination unit is (6-8): 1, the volume of a dechlorination unit is saved, so that the reagent dosage and the operation cost in the anode pre-film forming, anode passivation and necessary acid washing descaling processes are reduced; the descaling unit is used for scaling of a large cathode, pre-filming and passivation are not needed, the larger volume does not cause the cost increase of the medicament, and the descaling space can be increased.
Drawings
FIG. 1 is a flow diagram of the system and method for two-stage electrochemical water treatment for descaling and dechlorination of the present invention;
FIG. 2 is a schematic view of the descaling unit of the present invention;
FIG. 3 is a schematic diagram of a dechlorination unit of the present invention;
the device comprises a scale scraping unit 1, a scale removing unit 2, a dechlorinating unit 11, a first anode 12, a first cathode 13, a first shell 14, a scale scraping device 15, a first electric control unit 16, a first water inlet 17, a first water outlet 18, a first sewage discharge outlet 21, a second anode 22, a second cathode 23, a second shell 24, a second electric control element 25, a second water inlet 26, a second water outlet 27 and a second sewage discharge outlet.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in figure 1, the utility model provides a pair of two segmentation electrochemical water treatment systems for scale removal and dechlorination, including scale removal unit 1 and dechlorination unit 2, wherein, the inlet tube of pending raw water is connected to the water inlet of scale removal unit 1, the delivery port of scale removal unit 1 is connected dechlorination unit 2's water inlet, the outlet pipe is connected to dechlorination unit 2's delivery port.
As shown in a of fig. 2, the descaling unit 1 is a cylindrical structure and comprises a first anode 11, a first cathode 12, a first housing 13, a descaling device 14, a first electric control element 15, a first water inlet 16, a first water outlet 17 and a first blowdown port 18, wherein the first anode 11 is a cylindrical structure and is located at the center of the first housing 13 with the cylindrical structure, and the first cathode 12 is a cylindrical structure and is sleeved in the first housing 13 and is arranged between the first anode 11 and the first housing 13; the scale scraping device 14 is arranged outside the first cathode 12 and is used for scraping scale on the surface of the cathode; the first electronic control element 15 is connected to the first anode and the first cathode, respectively.
The scale scraping device 14 comprises a variable frequency motor, two circular fixed guide rails and a rod-shaped scraper, wherein the two circular fixed guide rails are respectively fixed at two ends of the first cathode 12; the both ends and the circular fixed guide rail sliding connection of bar-shaped scraper, bar-shaped scraper passes through the pivot with the motor and is connected, drives bar-shaped scraper along the surface motion of circular fixed guide rail through first negative pole through the motor for strike off first negative pole surface scaling.
The first electric control element 15 comprises a power supply, a numerical control system and a water quality probe, wherein the power supply supplies power to the cathode and the anode, the numerical control system and the water quality probe, the water quality probe is used for collecting hardness ions and LSI/RSI indexes in water and transmitting the collected data to the numerical control system, the numerical control system compares the received data with a set threshold value and outputs a command for regulating and controlling the current and the voltage of the first anode and the first cathode according to the comparison result.
The first anode 11 is one or more of Ru metal oxide, Ir metal oxide, Sn metal oxide, Sb metal oxide, and Ti metal oxide.
The first cathode 12 is stainless steel, carbon steel or nickel.
The first water inlet 16 and the first water outlet 17 are respectively located at two sides of the first casing 13, and the first drain outlet 18 is located at the center of the lower end of the first casing 13.
The descaling unit 1 is connected with a water inlet pipe of raw water to be treated through a first water inlet 16; is connected to the dechlorination unit 2 via a first drain 17.
As shown in b of fig. 2, the descaling unit 1 is a plate-type structure, and includes a first anode 11, a first cathode 12, a first housing 13, a descaling device 14 and a first electric control element 15, wherein the first anode 11 and the second cathode 12 are flat plate structures with equal areas, N first anodes 11 are provided, N +1 first cathodes 12 are provided, and the two are alternately arranged in the inner cavity of the first housing 13.
The number of the scale scraping devices 14 is N +1, and each scale scraping device 14 is correspondingly arranged on the outer side of one first cathode 12 and used for scraping scale on the surface of the cathode.
The first electronic control element 15 is connected to the first anode and the first cathode, respectively.
As shown in fig. 3, the dechlorination unit 2 is a plate-type structure, and includes N second anodes 21, N second cathodes 22, N second housings 23, N second electronic control elements 24, N second water inlets 25, N second water outlets 26, and N second sewage outlets 27, where the N second anodes 21 and the N second cathodes 22 are both of a flat plate structure and have the same area, and the two anodes are alternately arranged in the inner cavity of the second housing 23.
The second electric control element 24 comprises a power supply, a numerical control system and a water quality probe, wherein the power supply supplies power to the numerical control system and the water quality probe, the water quality probe is used for collecting hardness ions and LSI/RSI indexes in water and transmitting the collected data to the numerical control system, the numerical control system compares the received data with a set threshold value and outputs a command for regulating and controlling the current and the voltage of the second anode and the second cathode according to the comparison result.
The second water inlet 25 and the second water outlet 26 are respectively located at two sides of the second casing 23, and the second sewage outlet 27 is located at the middle of the lower end of the second casing 23.
The second casing 23 is provided with an exhaust hole at the upper part.
In order to prevent the anode of the dechlorination section from being corroded, the anode of the dechlorination section can be pre-coated by corrosion inhibition medicaments; or the anode of the dechlorination section is passivated in advance.
Because the volume of the dechlorination section is smaller, the medicament or electric energy consumption is reduced, thereby ensuring more convenient operation and reducing the cost.
The distance between the first anode 11 and the second cathode 12 of two adjacent plate structures is 3-10 cm.
The distance between two adjacent second anodes 21 and second cathodes 22 is less than or equal to 5 mm.
The volume ratio of the descaling unit 1 to the dechlorination unit 2 is (6-8): 1.
the two-section type electrochemical water treatment method of the system of descaling and dechlorination comprises the following steps:
1. raw water enters a descaling unit 1 to remove most of scale substances; the scaling material on the first cathode is scraped by the scaling device 14 and is discharged out of the system from the first drain port 18 of the descaling unit 1.
2. And (4) the water after descaling enters a dechlorination unit to remove most of chloride.
In the step 1, the descaling mode of the descaling unit 1 can be an automatic descaling mode or a manual descaling mode. When the raw water has high calcium and magnesium content and large treatment scale, a periodic automatic scale scraping mode is adopted, and the scale scraping period is 0.5-2 times/min. When the raw water has low calcium and magnesium content and small treatment scale, the scale layer on the surface of the cathode is slowly formed, the first cathode plate can be detached by adopting a manual scale removal mode, and the scale layer is removed by utilizing mechanical external force. Manual descaling has no fixed period, and descaling can be carried out when the descaling unit current is reduced by 20% or the voltage is increased by 20%.
In the step 2, the chlorine removal section provides more anode area in a smaller volume, so that the chlorine removal efficiency is ensured.
In the step 2, if the current flow is reduced by more than 20% or the voltage is increased by more than 20%, a small amount of scale on the cathode plate can be removed by pickling or reverse-grading periodically. Because most of the scaling substances are removed in step 1 in advance, the scaling of step 2 is greatly reduced, and the descaling frequency is reduced. Because the volume of the dechlorination unit is smaller, the water consumption of acid washing is reduced, and the cost is reduced.
The existing electrochemical water treatment equipment is often heavier than the descaling function and has poor effect. The reason is that: 1) in consideration of convenient descaling operation, the anode and cathode spacing is larger, so that the anode reaction efficiency is reduced; 2) the water oxidation competition reaction is generated on the surface of the anode, and the dechlorination efficiency is reduced.
The utility model discloses according to the different principles and the technological characteristics of scale removal and dechlorination, divide into scale removal section and dechlorination section with electrochemistry water treatment process, the structural design of every section is different: the descaling section is of a structure of large cathode and small anode, the dechlorinating section is of a structure of large anode and short polar plate interval, so that the electrochemical reaction efficiency of descaling and dechlorinating is optimal, and the order of descaling first and dechlorinating later can also achieve better comprehensive effect in practice.
The utility model discloses in, the anode material of dechlorination section adopts the composite metal oxide electrode of doping Sn or Pb, and chloride ion oxidation reaction's selectivity is higher, promotes the promotion of dechlorination effect.
Example 1
Utilize the utility model discloses a system handles power plant's circulating water.
The raw water hardness of the circulating water is 400mg/L (as CaCO)3The same applies hereinafter), the alkalinity was 300mg/L, and the chloride ion concentration was 300 mg/L.
The system adopts a cylindrical descaling unit and a plate-type dechlorinating unit. The cylinder type descaling unit comprises a cylindrical anode, a cylindrical cathode, a shell, a descaling device, an electric control element, a water inlet, a water outlet and a sewage outlet. The anode is a Ti/Ru electrode, the cathode is positioned on the inner side of the shell and is made of stainless steel, and the radius of the cylinder is 30 cm; the scale scraping device consists of 8 rod-shaped movable scrapers, the scrapers are parallel to the central axis of the scale removing unit and are uniformly distributed on the inner side of the cathode surface in the radial direction, scale on the surface of the cathode is scraped through rotary motion, and the scale is scraped for 1 time every 1 min. The electric control element comprises a power supply, a numerical control system, an electrode wiring and a water quality probe, and can observe hardness ions and LSI/RSI index in water as required and regulate and control the current and voltage of the system. The water inlet and the water outlet are respectively positioned at two sides of the shell, and the sewage discharge outlet is positioned in the middle of the lower end of the shell.
The dechlorination unit comprises an anode, a cathode, a shell, an electric control element, a water inlet, a water outlet and a sewage outlet. The anode is a Ru-Ir composite electrode, and the total number of the anodes is 50; the cathode is a nickel plate, and the total number of the cathodes is 51; the anode and the cathode are flat electrodes with equal areas and are alternately arranged, and the distance between the polar plates is 5 mm. The electric control element comprises a power supply, a numerical control system, an electrode wiring and a water quality probe, and can observe chloride ions in water as required and regulate and control the current and voltage of the system. The water inlet and the water outlet are respectively positioned at two sides of the shell, and the sewage discharge outlet is positioned in the middle of the lower end of the shell. The upper part of the shell is provided with an exhaust hole.
The electrochemical water treatment comprises the following steps:
1) the method comprises the following steps that (1) circulating water raw water of a power plant enters a descaling unit to remove most of scale substances; and scaling substances on the cathode are scraped by the scaling device and are discharged out of the system from a sewage discharge port of the scaling unit.
2) And (4) the water after descaling enters a dechlorination unit to remove most of chloride.
In the step 1, the descaling mode of the descaling unit is automatic descaling, and the descaling period is 1 time/min.
In the step 2, the anode of the dechlorination section is passivated in advance. When a reduction of the current flow of more than 20% is observed, a small amount of fouling on the cathode plate is removed by means of pickling.
The hardness removal rate of the electrochemical water treatment is more than 60%, and the chloride ion removal rate is more than 40%.
Example 2
The system of the utility model is utilized to treat reverse osmosis concentrated water.
The hardness of the reverse osmosis concentrated water is 2000mg/L (as CaCO)3The same applies hereinafter), the alkalinity was 500mg/L, and the chloride ion concentration was 1000 mg/L.
The system adopts a plate type descaling unit and a plate type dechlorinating unit. The plate-type descaling unit comprises an anode, a cathode, a shell, a descaling device, an electric control element, a water inlet, a water outlet and a sewage outlet. The anode is a Ru-Ir/Ti electrode, the cathode is a stainless steel electrode, the number of the anodes and the number of the cathodes are respectively 10 and 11, the anodes and the cathodes are flat plate electrodes, the areas of the anodes and the cathodes are equal, the anodes and the cathodes are arranged alternately, and the distance between adjacent polar plates is 2 cm. The scale scraping device consists of (1-2) 22 rod-shaped movable scrapers, the scrapers are vertically positioned on two sides of the cathode, and scale on the surface of the cathode is scraped through left-right alternate movement. The electric control element comprises a power supply, a numerical control system, an electrode wiring and a water quality probe, and can observe hardness ions and LSI/RSI index in water as required and regulate and control the current and voltage of the system. The water inlet and the water outlet are respectively positioned at two sides of the shell, and the sewage discharge outlet is positioned in the middle of the lower end of the shell. The upper part of the shell is provided with an exhaust hole.
The dechlorination unit comprises an anode, a cathode, a shell, an electric control element, a water inlet, a water outlet and a sewage outlet. The anode is a Ru-Ir/Ti composite electrode, and the total number of the anodes is 50; the cathode is a nickel plate, and the total number of the cathodes is 51; the anode and the cathode are flat electrodes with equal areas and are alternately arranged, and the distance between the polar plates is 5 mm. The electric control element comprises a power supply, a numerical control system, an electrode wiring and a water quality probe, and can observe chloride ions in water as required and regulate and control the current and voltage of the system. The water inlet and the water outlet are respectively positioned at two sides of the shell, and the sewage discharge outlet is positioned in the middle of the lower end of the shell. The upper part of the shell is provided with an exhaust hole.
The electrochemical water treatment comprises the following steps:
1) the method comprises the following steps that (1) circulating water raw water of a power plant enters a descaling unit to remove most of scale substances; and scaling substances on the cathode are scraped by the scaling device and are discharged out of the system from a sewage discharge port of the scaling unit.
2) And (4) the water after descaling enters a dechlorination unit to remove most of chloride.
In the step 1, the descaling mode of the descaling unit is automatic descaling, and the descaling period is 1 time/min.
In the step 2, corrosion inhibitor pre-film treatment is carried out on the dechlorination section anode in advance. When a reduction of the current flow of more than 20% is observed, a small amount of fouling on the cathode plate is removed by means of pickling.
The hardness removal rate of the electrochemical water treatment is more than 40%, and the chloride ion removal rate is more than 20%.
The non-detailed parts of the present invention belong to the known technology in the field.
The above description is only a part of the embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the scope of the present invention.
Claims (10)
1. The two-section type electrochemical water treatment system for descaling and dechlorination is characterized by comprising a descaling unit (1) and a dechlorination unit (2), wherein a water inlet of the descaling unit (1) is connected with a water inlet pipe of raw water to be treated, a water outlet of the descaling unit (1) is connected with a water inlet of the dechlorination unit (2), and a water outlet of the dechlorination unit (2) is connected with a water outlet pipe;
the descaling unit (1) is of a cylindrical structure and comprises a first anode (11), a first cathode (12), a first shell (13), a descaling device (14) and a first electric control element (15), wherein the first anode (11) is of a cylindrical structure and is positioned in the center of the first shell (13) with the cylindrical structure, and the first cathode (12) is of a cylindrical structure and is sleeved in the first shell (13) and is arranged between the first anode (11) and the first shell (13); the scale scraping device (14) is arranged outside the first cathode (12); the first electric control element (15) is respectively connected with the first anode and the first cathode;
the dechlorination unit (2) comprises second anodes (21), second cathodes (22), a second shell (23) and second electric control elements (24), wherein the number of the second anodes (21) is N, the number of the second cathodes (22) is N +1, the second anodes (21) and the second cathodes (22) are alternately arranged in an inner cavity of the second shell (23), and the second electric control elements (24) are respectively connected with the second anodes and the second cathodes.
2. The two-stage electrochemical water treatment system for descaling and dechlorinating according to claim 1, wherein the descaling device (14) comprises a motor, two circular fixed guide rails and a rod-shaped scraper, and the two circular fixed guide rails are respectively fixed at two ends of the first cathode (12); the both ends and the circular fixed guide rail sliding connection of bar-shaped scraper, bar-shaped scraper passes through the pivot with the motor and is connected, drives bar-shaped scraper along the surface motion of circular fixed guide rail through first negative pole through the motor for strike off first negative pole surface scaling.
3. The two-stage electrochemical water treatment system for descaling and dechlorination according to claim 1, wherein the first electronic control element (15) comprises a power supply, a numerical control system and a water quality probe, wherein the power supply supplies power to the cathode and anode, the numerical control system and the water quality probe, the water quality probe is used for collecting hardness ions and LSI/RSI index in water and transmitting the collected data to the numerical control system, the numerical control system compares the received data with a set threshold value, and outputs a command for regulating and controlling the current and voltage of the first anode and the first cathode according to the comparison result.
4. A two-stage electrochemical water treatment system for descaling and dechlorination according to claim 1, characterized in that the first anode (11) is one or more of Ru metal oxide, Ir metal oxide, Sn metal oxide, Sb metal oxide and Ti metal oxide.
5. The two-stage electrochemical water treatment system for descaling and dechlorination according to claim 1, wherein the first cathode (12) is stainless steel, carbon steel or nickel.
6. Two-stage electrochemical water treatment system for descaling and dechlorination according to claim 1, wherein the descaling unit is a plate-type structure, in particular: the first anodes (11) and the first cathodes (12) are of flat plate structures with equal areas, wherein the number of the first anodes (11) is N, the number of the first cathodes (12) is N +1, and the first anodes and the first cathodes are alternately arranged in the inner cavity of the first shell (13); the number of the scale scraping devices (14) is N +1, and each scale scraping device (14) is correspondingly arranged on the outer side of one first cathode (12) and used for scraping scale on the surface of the cathode.
7. The two-stage electrochemical water treatment system for descaling and dechlorination according to claim 6, wherein the distance between two adjacent first anodes (11) and first cathodes (12) is 3-10 cm.
8. The two-stage electrochemical water treatment system for descaling and dechlorination according to claim 1, wherein the second anode (21) and the second cathode (22) are both of flat plate structure and equal in area; the distance between two adjacent second anodes (21) and second cathodes (22) is less than or equal to 5 mm.
9. The two-stage electrochemical water treatment system for descaling and dechlorination according to claim 1, wherein the second electronic control element (24) comprises a power supply, a numerical control system and a water quality probe, wherein the power supply supplies power to the numerical control system and the water quality probe, the water quality probe is used for collecting hardness ions and LSI/RSI index in water and transmitting the collected data to the numerical control system, the numerical control system compares the received data with a set threshold value, and outputs a command for regulating and controlling the current and voltage of the second anode and the second cathode according to the comparison result.
10. The two-stage electrochemical water treatment system for descaling and dechlorination according to claim 1, wherein the descaling unit (1) and the dechlorination unit (2) have a volume ratio of (6-8): 1.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110204011A (en) * | 2019-07-11 | 2019-09-06 | 中国华能集团清洁能源技术研究院有限公司 | A kind of two-part electro-chemical water processing system for scale removal and dechlorination |
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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110204011A (en) * | 2019-07-11 | 2019-09-06 | 中国华能集团清洁能源技术研究院有限公司 | A kind of two-part electro-chemical water processing system for scale removal and dechlorination |
| CN110204011B (en) * | 2019-07-11 | 2024-07-16 | 中国华能集团清洁能源技术研究院有限公司 | Two-section electrochemical water treatment system for descaling and dechlorination |
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