CN211847518U - Circulating water treatment system of power plant - Google Patents
Circulating water treatment system of power plant Download PDFInfo
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- CN211847518U CN211847518U CN201922368199.4U CN201922368199U CN211847518U CN 211847518 U CN211847518 U CN 211847518U CN 201922368199 U CN201922368199 U CN 201922368199U CN 211847518 U CN211847518 U CN 211847518U
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Abstract
The utility model belongs to the field of power plant circulating water, and relates to a power plant circulating water treatment system, which comprises a circulating water pretreatment tank, wherein a water inlet of the circulating water pretreatment tank is connected with a power plant circulating water bypass water outlet; a chemical feeding port is arranged at the water inlet of the circulating water pretreatment tank, a stirrer is arranged at the top of the circulating water pretreatment tank, a submersible pump for treating sludge and dirt deposited at the bottom of the pretreatment tank is arranged at the bottom of the circulating water pretreatment tank, and a filter screen for removing large dirt in the circulating water is arranged at the water outlet of the circulating water pretreatment tank; the water inlet of the electrochemical sterilization and descaling device is connected with the water outlet of the circulating water pretreatment tank, and the water outlet of the electrochemical sterilization and descaling device is connected with a circulating water return pipe of a power plant. The acid and alkali resistant pretreatment pool is added on the basis of the electrochemical sterilization and descaling device, the concentration multiple of the treated water is greatly improved, the device is suitable for various water qualities except organic wastewater containing COD, ammonia nitrogen and the like, and particularly has excellent effect on the treatment of the wastewater containing higher magnesium concentration.
Description
Technical Field
The utility model belongs to power plant's circulating water field relates to a power plant's circulating water treatment system.
Background
The circulating cooling water is the water consumption of coal-fired power plants, and the water consumption reaches 50-80% of the total water consumption of the power plants. Therefore, the treatment effect of the circulating water is closely related to the water saving and emission reduction efficiency of the power plant. In the circulating water running process, calcium ions and magnesium ions in water are continuously concentrated and combined with anions in water to form precipitate deposition, which can cause pipeline blockage, reduced circulating water flow, overhigh temperature of cooling equipment and reduced heat exchange efficiency; meanwhile, the propagation of a large number of microorganisms causes the problems of corrosion of pipelines, microorganism slime and the like, and influences the normal operation of the system.
In the traditional circulating water treatment, a scale inhibitor, a corrosion inhibitor and a sterilization algicide are added into circulating water, but the scale inhibitor and the corrosion inhibitor cannot reduce the concentration of Ca and Mg ions in water and cannot avoid the formation of scale. The existing electrochemical sterilization and descaling device is widely used for treating circulating cooling water (desulfurization wastewater) of a power plant due to simplicity, rapidness, environmental protection, no pollution and good treatment effect.
The electrochemical sterilization descaling equipment has an outstanding sterilization effect, so that corrosion of bacteria to a system can be reduced, and when the equipment is used for treating cooling circulating water, no chemical agent is added, so that the corrosion generated by the chemical agent can be reduced, partial chloride ions can be electrolyzed into chlorine gas by the equipment in electrolysis and dispersed, and the chlorine gas is finally discharged out of a circulating water system, so that the corrosion of the chloride ions to equipment such as pipelines, heat exchangers, condensers and the like can also be reduced. More importantly, the hydroxyl ions and active oxygen generated during the electrolysis process can promote the tubeFerrous ions and ferric ions on the inner wall of the heat exchanger and the inner wall of the heat exchanger finally generate ferroferric oxide (Fe)3O4) The magnet protective film is compact, and the magnet film separates the pipe wall from water to prevent further corrosion. Calcium and magnesium ions are scaling ions in circulating water, and calcium ions easily form scale, and the dissolved salts in natural water are mostly bicarbonate (Ca (HCO)3)2、Mg(HCO3)2) And is unstable and easily decomposed into carbonate scales. However, magnesium ions are generally not counted as scale ions in circulating water systems because magnesium ions do not readily form magnesium hydroxide scale at the pH of the circulating water. Therefore, if the concentration of Mg ions in the circulating water system is high, pretreatment is needed, and the concentration of Mg ions in the circulating water is greatly reduced. Therefore, further research and application development of the technology for electrochemically treating the circulating water of the power plant are necessary.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome above-mentioned prior art's shortcoming, provide a power plant's circulating water treatment system.
In order to achieve the above purpose, the utility model provides a following technical scheme:
a power plant circulating water treatment system comprising:
the water inlet of the circulating water pretreatment tank is connected with the water outlet of a power plant circulating water bypass; a chemical feeding port is formed in a water inlet of the circulating water pretreatment tank, a stirrer is arranged at the top of the circulating water pretreatment tank, a submersible pump for treating sludge and dirt deposited at the bottom of the pretreatment tank is arranged at the bottom of the circulating water pretreatment tank, and a filter screen for removing large dirt in circulating water is arranged at a water outlet of the circulating water pretreatment tank;
the water inlet of the electrochemical sterilization descaling device is connected with the water outlet of the circulating water pretreatment tank, and the water outlet of the electrochemical sterilization descaling device is connected with a circulating water return pipe of a power plant.
Further, the circulating water pretreatment pool is formed by excavating on the ground and pouring an acid and alkali resistant cylinder and a conical concrete pool or an acid and alkali resistant glass fiber reinforced plastic or plastic ton bucket.
Furthermore, the electrochemical sterilization descaling device comprises an electrochemical reaction chamber, a cathode reaction zone and an anode reaction zone, wherein a slag hopper, a slag discharge valve and a slag discharge pipe are arranged at the bottom of the electrochemical reaction chamber, and a water inlet flowmeter, a water outlet flowmeter and a direct-current power supply are arranged outside the electrochemical reaction chamber.
Furthermore, the anode of the electrochemical sterilization and descaling device is opposite to the cathode, the anode adopts a Ru-Ir-Ti noble metal oxide coating anode, the cathode can be titanium plates with different sizes and shapes, and a cathode binding post is arranged on the titanium plate.
Furthermore, the bottom of the electrochemical reaction chamber is vertically connected with a plurality of groups of polar plates in parallel, the upper part of the electrochemical reaction chamber is horizontally connected with a plurality of groups of polar plates in parallel, and a circulating water flow channel which is S-shaped to discharge is arranged on the negative plate.
Furthermore, a cover plate is arranged at the front part of the electrochemical reaction chamber, and the cover plate and the electrochemical reaction chamber box body are sealed by a sealing ring.
Furthermore, the cathode wiring terminal of the electrochemical reaction type penetrates through the inner wall of the rear part of the electrochemical reaction chamber, the anode wiring terminal penetrates through the cover plate of the front part of the electrochemical reaction chamber, the cathode wiring terminal and the anode wiring terminal are connected with a high-frequency direct-current power supply through cables outside the electrochemical reaction chamber, and the cathode wiring terminal and the anode wiring terminal are sealed with the cover plate through sealing rings.
Further, the range of the water quality of the circulating water which can be treated by the system is as follows: the total hardness is 100mg/L-10000mg/L, the calcium hardness is 50mg/L-3000mg/L, the magnesium hardness is 50mg/L-5000mg/L, the total alkalinity is 50mg/L-500mg/L, and Cl-The concentration is 1000mg/L-15000 mg/L.
Compared with the prior art, the utility model provides a technical scheme includes following beneficial effect: the circulating water pretreatment tank is added on the basis of electrochemical sterilization and descaling, the total alkalinity of the circulating water is fundamentally removed by adding caustic soda and the like, so that the phenomenon that calcium bicarbonate, magnesium bicarbonate and the like are subjected to thermal decomposition to cause scale deposition when the circulating water flows through the heat exchanger is avoided, and the heat exchange efficiency is reduced; by adding caustic soda and the like, the concentration of magnesium, calcium and the like in the circulating water is greatly reduced, and the further treatment of the sterilization and descaling device is facilitated; by pretreatment of circulating waterThe submersible pump arranged at the bottom of the pool reduces manual cleaning of sludge, dirt and the like at the bottom of the pool, and greatly saves cost; by using the electrochemical sterilization and descaling device, the addition of scale inhibitor, corrosion inhibitor and bactericide is avoided, the cost is reduced, and Cl in the circulating water is reduced-Content of (1) slows down Cl-Corrosion of the circulating water line.
In addition, a plurality of groups of polar plates are vertically arranged in parallel at the bottom of an electrochemical reaction chamber of the electrochemical sterilization descaling device, so that the deposition of water scale on a negative plate is greatly reduced, and the corrosion of the under-scale corrosion to the polar plates is greatly reduced; the multiple groups of polar plates are horizontally arranged on the upper part of the electrochemical reaction chamber of the electrochemical sterilization descaling device, and the polar plates are provided with the circulating water flow channel which is S-shaped to discharge, so that scale can be prevented from entering a circulating water pipeline due to the impact of water flow.
Drawings
Fig. 1 is a schematic structural diagram of a circulating water treatment system of a power plant provided by the present invention;
FIG. 2 is a schematic structural view of the electrochemical sterilization and descaling device provided by the present invention;
fig. 3 is a schematic structural diagram of the pretreatment tank provided by the present invention.
Wherein: 1. an electrochemical reaction chamber; 2. a polar plate; 3. a cathode terminal; 4. an anode terminal; 5. a water inlet flow meter; 6. a water inlet of the electrochemical sterilization and descaling device; 7. a slag hopper; 8. a slag discharge valve; 9. a slag discharge pipe; 10. a water outlet of the electrochemical sterilization and descaling device; 11. a water outlet flow meter; 12. a direct current power supply; 13. a medicine adding port; 14. a water inlet of the circulating water pretreatment tank; 15. a blow-off pipe; 16. a submersible pump; 17. a circulating water pretreatment tank; 18. a filter screen; 19. a water outlet of the circulating water pretreatment tank; 20. a stirrer.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of systems consistent with certain aspects of the invention, as detailed in the appended claims.
In order to make those skilled in the art better understand the technical solution of the present invention, the present invention will be further described in detail with reference to the accompanying drawings and the embodiments.
Examples
Referring to fig. 1, the utility model provides a power plant's circulating water treatment system, include:
the water inlet 14 of the circulating water pretreatment tank is connected with the water outlet of the power plant circulating water bypass; a water inlet 14 of the circulating water pretreatment tank is provided with a chemical adding port 13, the top of the circulating water pretreatment tank is provided with a stirrer 20, the bottom of the circulating water pretreatment tank is provided with a submersible pump 16 for treating sludge and dirt deposited at the bottom of a pretreatment tank 17, and a water outlet 19 of the circulating water pretreatment tank is provided with a filter screen for removing large dirt in circulating water;
the water inlet 6 of the electrochemical sterilization descaling device is connected with the water outlet 19 of the circulating water pretreatment pool, and the water outlet 10 of the electrochemical sterilization descaling device is connected with a circulating water return pipe of a power plant.
Further, the circulating water pretreatment tank 17 is formed by excavating on the ground and pouring an acid and alkali resistant cylinder and a conical concrete tank or an acid and alkali resistant glass fiber reinforced plastic or plastic ton barrel.
Further, the electrochemical sterilization descaling device comprises an electrochemical reaction chamber 1, a cathode reaction zone and an anode reaction zone, wherein a slag bucket 7, a slag discharge valve 8 and a slag discharge pipe 9 are arranged at the bottom of the electrochemical reaction chamber 1, and a water inlet flowmeter 5, a water outlet flowmeter 11 and a direct current power supply 12 are arranged outside the electrochemical reaction chamber.
Furthermore, the anode of the electrochemical sterilization and descaling device is opposite to the cathode, the anode adopts a Ru-Ir-Ti noble metal oxide coating anode, the cathode can be titanium plates with different sizes and shapes, and a cathode binding post 3 is arranged on the titanium plate.
Further, the bottom of the electrochemical reaction chamber 1 is vertically connected with a plurality of groups of polar plates 2 in parallel, the upper part of the electrochemical reaction chamber is horizontally connected with a plurality of groups of polar plates 2 in parallel, and a circulating water flow channel which is S-shaped to discharge is arranged on the negative plate.
Furthermore, the front part of the electrochemical reaction chamber 1 is provided with a cover plate, and the cover plate and the box body of the electrochemical reaction chamber 1 are sealed by a sealing ring.
Further, a cathode binding post 3 of the electrochemical reaction type penetrates through the inner wall of the rear part of the electrochemical reaction chamber 1, an anode binding post 4 penetrates through a cover plate of the front part of the electrochemical reaction chamber 1, the cathode binding post 3 and the anode binding post 4 are connected with a high-frequency direct-current power supply through cables outside the electrochemical reaction chamber, and the cathode binding post 3, the anode binding post 4 and the cover plate are sealed through sealing rings.
Further, the range of the water quality of the circulating water which can be treated by the system is as follows: the total hardness is 100mg/L-10000mg/L, the calcium hardness is 50mg/L-3000mg/L, the magnesium hardness is 50mg/L-5000mg/L, the total alkalinity is 50mg/L-500mg/L, and Cl-The concentration is 1000mg/L-15000 mg/L.
In addition, the method for treating the circulating water of the power plant by using the circulating water treatment system of the power plant comprises the following steps:
1) leading out circulating water of a power plant from a water outlet of a circulating water bypass, treating the circulating water by a circulating water pretreatment tank, and then entering an electrochemical sterilization and descaling device;
2) the electrochemical sterilization descaling device carries out electrochemical treatment on the entering water and then enters a circulating water return pipe of the power plant.
Further, the working voltage of the electrochemical sterilization descaling device during electrochemical treatment<16V, current<800A, flow rate<120m3/h。
The following desulfurization wastewater water quality indexes of a certain power plant are combined, and the desulfurization wastewater water quality indexes of the power plant are as follows: the pH value is 7.29(30 ℃), the total alkalinity is 207.9mg/L, the total hardness is 7390mg/L, the calcium hardness is 1892.3mg/L, the magnesium hardness is 5497.7mg/L, and the chloride ion content is 1300.8 mg/L. Utilize the utility model provides a this kind of power plant's circulating water treatment system and method handles this power plant's circulating water, and concrete processing procedure is as follows: introducing the desulfurization wastewater into a circulating water pretreatment tank 17, gradually adding caustic soda powder to a fixed amount at a water inlet 14 of the circulating water pretreatment tank, continuously adding caustic soda under stirring until the pH value is 10, stopping adding chemicals, and continuously stirring for 5-10 minutes to accelerate the chemicalsThen standing for 15-20 minutes to facilitate the rapid sedimentation of solid products, so as to remove the total alkalinity and magnesium ions and reduce the conductivity. Introducing the treated and standing clear liquid into an electrochemical sterilization and descaling device, and performing operation under working voltage<16V, current<800A, flow rate<120m3The electrolysis was carried out under the conditions of/h. After the electrolysis is operated for a period of time, the water quality of the circulating water is tested as follows: the total alkalinity is 0mg/L, the total hardness is 284.3mg/L, the calcium hardness is 187.3mg/L, the magnesium hardness is 97mg/L, and the chloride ion is 471mg/L, which accords with the industrial circulating cooling water treatment design specification (GB/T50050-2017).
Therefore, the utility model provides a this kind of power plant's circulating water processing system has increased circulating water preliminary treatment pond 17 on the basis of the scale removal that disinfects of electrochemistry, has increased the process to the processing of circulating water, has greatly improved the concentration multiple of handling water, is applicable to except containing organic waste water such as COD, ammonia nitrogen various quality of water, especially has fabulous effect to the processing of the higher waste water of magnesium concentration.
The above description is only exemplary of the invention, and is intended to enable those skilled in the art to understand and implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention.
It is to be understood that the present invention is not limited to what has been described above, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.
Claims (8)
1. A power plant circulating water treatment system, comprising:
the water inlet (14) of the circulating water pretreatment tank is connected with the water outlet of a power plant circulating water bypass; a chemical adding port (13) is formed in a water inlet (14) of the circulating water pretreatment tank, a stirrer (20) is arranged at the top of the circulating water pretreatment tank, a submersible pump (16) for treating sludge and dirt deposited at the bottom of the circulating water pretreatment tank (17) is arranged at the bottom of the circulating water pretreatment tank, and a filter screen (18) for removing large dirt in circulating water is arranged at a water outlet (19) of the circulating water pretreatment tank;
the water inlet (6) of the electrochemical sterilization descaling device is connected with the water outlet (19) of the circulating water pretreatment tank, and the water outlet (10) of the electrochemical sterilization descaling device is connected with a circulating water return pipe of a power plant.
2. The power plant circulating water treatment system of claim 1, wherein the circulating water pretreatment tank (17) is formed by excavating on the ground, pouring an acid and alkali resistant cylindrical and conical concrete tank, or an acid and alkali resistant glass fiber reinforced plastic or plastic ton bucket.
3. The power plant circulating water treatment system according to claim 1, wherein the electrochemical sterilization and descaling device comprises an electrochemical reaction chamber (1), a cathode reaction zone and an anode reaction zone, a slag hopper (7), a slag discharge valve (8) and a slag discharge pipe (9) are arranged at the bottom of the electrochemical reaction chamber (1), and a water inlet flowmeter (5), a water outlet flowmeter (11) and a direct current power supply (12) are arranged outside the electrochemical reaction chamber.
4. The power plant circulating water treatment system of claim 3, wherein the anode of the electrochemical sterilization and descaling device is opposite to the cathode, and the anode is a Ru-Ir-Ti noble metal oxide coating anode.
5. A power plant circulating water treatment system according to claim 3, characterized in that the bottom of the electrochemical reaction chamber (1) is vertically provided with a plurality of groups of pole plates (2) in parallel, the upper part is horizontally provided with a plurality of groups of pole plates (2) in parallel, and the cathode plate is provided with a circulating water flow channel which is S-shaped in discharge.
6. A power plant circulating water treatment system according to claim 3, characterized in that the front part of the electrochemical reaction chamber (1) is provided with a cover plate, and the cover plate is sealed with the box body of the electrochemical reaction chamber (1) by a sealing ring.
7. A power plant circulating water treatment system according to claim 6, characterized in that a cathode terminal (3) of the electrochemical reaction chamber penetrates through the inner wall of the rear part of the electrochemical reaction chamber (1), an anode terminal (4) penetrates through the cover plate of the front part of the electrochemical reaction chamber (1), the cathode terminal (3) and the anode terminal (4) are connected with a high-frequency direct current power supply (12) outside the electrochemical reaction chamber (1) through cables, and the cathode terminal (3) and the anode terminal (4) are sealed with the cover plate through sealing rings.
8. A power plant circulating water treatment system as claimed in claim 1, wherein the water quality of the circulating water that can be treated by the system is in the range of: the total hardness is 100mg/L-10000mg/L, the calcium hardness is 50mg/L-3000mg/L, the magnesium hardness is 50mg/L-5000mg/L, the total alkalinity is 50mg/L-500mg/L, and the Cl-concentration is 1000mg/L-15000 mg/L.
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| CN201922368199.4U CN211847518U (en) | 2019-12-26 | 2019-12-26 | Circulating water treatment system of power plant |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111039474A (en) * | 2019-12-26 | 2020-04-21 | 西安泰金工业电化学技术有限公司 | Power plant circulating water treatment system and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111039474A (en) * | 2019-12-26 | 2020-04-21 | 西安泰金工业电化学技术有限公司 | Power plant circulating water treatment system and method |
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Address after: 710299 No. 15, west section of Xijin Road, Jingwei Industrial Park, Xi'an Economic and Technological Development Zone, Xi'an City, Shaanxi Province Patentee after: Xi'an Taijin Xinneng Technology Co.,Ltd. Address before: No.15, west section of Xijin Road, Jingwei Industrial Park, Xi'an Economic and Technological Development Zone, Xi'an City, Shaanxi Province 710201 Patentee before: XI'AN TAIJIN INDUSTRIAL ELECTROCHEMICAL TECHNOLOGY Co.,Ltd. |