CN210122508U - Power plant circulating water treatment system comprising electrochemical sterilization and descaling device and electrodialysis device - Google Patents
Power plant circulating water treatment system comprising electrochemical sterilization and descaling device and electrodialysis device Download PDFInfo
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- CN210122508U CN210122508U CN201920912151.2U CN201920912151U CN210122508U CN 210122508 U CN210122508 U CN 210122508U CN 201920912151 U CN201920912151 U CN 201920912151U CN 210122508 U CN210122508 U CN 210122508U
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Abstract
The utility model relates to a circulating water treatment system and method of power plant including electrochemistry sterilization scale removal device and electrodialysis device, include: an electrochemical sterilization and descaling device; the water inlet of the electrochemical sterilization and descaling device is connected with the water outlet of the power plant circulating water bypass; an electrodialysis unit; the water inlet of the electrodialysis device is connected with the water outlet of the electrochemical sterilization and descaling device; the electrodialysis device comprises a fresh water outlet and a concentrated water outlet; the concentrated water outlet of the electrodialysis device is connected with the water inlet of the electrochemical sterilization and descaling device, and the fresh water outlet of the electrodialysis device is connected with the circulating water return pipe of the power plant. The utility model utilizes electrochemical treatment to replace chemical agents, thereby avoiding the cost of agent purchase and simultaneously preventing secondary pollution; scale can be discharged out of the system through an electrochemical reaction and a scale scraping device, the concentration rate of circulating water is greatly improved, most of discharged water is recycled through electrodialysis treatment, and the purposes of water saving and emission reduction are achieved.
Description
Technical Field
The utility model belongs to power plant's circulating water field, in particular to power plant's circulating water treatment system and method.
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. During the operation of circulating water, due to the processes of ionic reaction, dissolved oxygen, microorganism breeding and the like in water, the problems of scaling, corrosion, microorganism slime and the like can be caused, and the normal operation of the system is influenced. The traditional chemical treatment method is to reduce the influence of scaling corrosion by adding certain scale inhibitor, corrosion inhibitor and bactericide, and the method needs to consume a large amount of chemical agents, thereby increasing the operation cost; the treatment effect is limited, so that the concentration rate of circulating water is low, and the consumption of make-up water is high; the sewage discharge amount is large, the added chemical agents are contained in the sewage, the serious pollution to the water body is caused, and the operating cost of subsequent sewage treatment facilities is increased.
In recent years, with the prominent environmental protection problem and the enhanced environmental protection consciousness, the national requirements for water saving and emission reduction are more and more strict, and a high-efficiency circulating water treatment process with low chemical dosage, less pollution discharge and lower cost is urgently needed to be developed so as to meet the development requirements of power plants. The electrochemical technology is a novel circulating water treatment process, realizes the removal of circulating water scaling substances and microorganisms through the electrochemical reaction of a cathode region and an anode region, has the advantages of no addition of chemical water treatment agents, no secondary pollution, low investment and operation cost, water saving, energy saving and the like, and is favorable for realizing the near zero emission of wastewater.
The electrochemical circulating water treatment technology has some application researches in the fields of domestic steel, metallurgy, chemical industry and the like, for example: one company of Wu Steel group adopts a plate-type electrochemical water treatment device to descale circulating water, and the treatment capacity is 375m3The device has much higher removal effect on circulating water hardness and conductive ions than a chemical treatment mode. An electrochemical treatment device is loaded on a bypass of a circulating water pipeline in a certain ferroalloy factory, and the treatment flow is 1000m3Research results show that the electrochemical process has excellent scale inhibition effect. A certain iron and steel metallurgical enterprise performs a pilot test through electrochemical equipment in indirect cooling open type circulating cooling water treatment, and the treatment water amount is 1700m3And h, the water quality stabilization effects of sterilization, algae removal, corrosion inhibition, scale inhibition and the like of the electrochemical method are verified by combining the analysis of the test result, and the economic cost calculation is carried out, so that the method is more economical and practical compared with the chemical method. Although the electrochemical treatment technology has a good effect in the above cases, the electrochemical treatment technology is limited to a pilot-scale research level, is not popularized in a large scale, lacks an actual industrialization paradigm and operation management experience, and has less research on circulating water of a power plant. Therefore, research and application development of the technology for electrochemically treating the circulating water of the power plant are necessary.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems existing in the prior art, the utility model aims to provide a circulating water treatment system of power plant comprising an electrochemical sterilization and descaling device and an electrodialysis device.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a power plant circulating water treatment system comprising an electrochemical sterilization and descaling device and an electrodialysis device comprises:
an electrochemical sterilization and descaling device; the water inlet of the electrochemical sterilization and descaling device is connected with the water outlet of the power plant circulating water bypass;
an electrodialysis unit; the water inlet of the electrodialysis device is connected with the water outlet of the electrochemical sterilization and descaling device; the electrodialysis device comprises a fresh water outlet and a concentrated water outlet;
the concentrated water outlet of the electrodialysis device is connected with the water inlet of the electrochemical sterilization and descaling device, and the fresh water outlet of the electrodialysis device is connected with the circulating water return pipe of the power plant.
Furthermore, the electrochemical sterilization and descaling device comprises a cathode reaction area, an anode reaction area and an electric control descaling system; the electrically controlled scale scraping system is used for scraping scale formed in the cathode reaction zone.
Furthermore, the electrochemical sterilization and descaling device is provided with a sludge discharge port, and the sludge discharge port is connected with sludge dewatering equipment through a pipeline.
Furthermore, a cathode of the electrochemical sterilization and descaling device adopts a titanium-based coating electrode; the anode of the electrochemical sterilization and descaling device adopts a Ru-Ir alloy coating electrode.
Furthermore, the electrochemical sterilization and descaling device adopts a cathode protection strategy, and the power supply system enables the cathode of the electrochemical sterilization and descaling device to be in a negative electricity protection state.
Further, the electrodialysis device is a multi-stage countercurrent reverse electrodialysis device.
Further, the device also comprises a cooling tower; the water outlet of the cooling tower is connected with the water inlet of the sludge dewatering equipment through a power plant circulating water drain pipe, and the water outlet of the sludge dewatering equipment is connected with the water return port of the cooling tower through a power plant circulating water return pipe to form a power plant circulating water loop; the inlet of the power plant circulating water bypass is communicated with a power plant circulating water drain pipe; the cooling tower is also connected with a water replenishing pipe.
The utility model discloses power plant's circulating water treatment system during operation, including following step:
① the circulating water of the power plant is led out from the circulating water bypass of the power plant, and the produced water after entering the electrochemical sterilization and descaling device for electrochemical treatment enters the electrodialysis device;
② electrodialysis device carries out multi-stage countercurrent reverse electrode electrodialysis on the entering water, the generated concentrated water enters the electrochemical sterilization descaling device, and the generated fresh water enters the circulating water return pipe of the power plant.
Further, in step ①, the electrochemical sterilization and descaling device reacts in the cathode region as follows:
2H2O(g)+2e-→H2(g)+2OH-(aq)
high-concentration hydroxide radicals are gathered near the cathode region, so that calcium ions and bicarbonate ions in water form precipitates:
Ca2+(aq)+2OH-(aq)→Ca(OH)2(Scale)
Ca2+(aq)+CO3 2-(aq)→CaCO3(Scale)
The scale substances are attached to the surface of the cathode;
in step ①, the electrochemical sterilization and descaling device reacts in the anode region as follows:
oxygen generation 4HO-→O2(g)+2H2O+4e-
Free chlorine Cl-–e-→Cl0
Chlorine 2Cl-(aq)→Cl2(g)+2e-
Ozone O2+2HO-–2e-→O3(g)+H2O
Hydroxyl radical OH-–e-→OH0
Hydrogen peroxide 2H2O–2e-→H2O2+2H+
Oxygen free radical 2H2O–2e-→O0+2H+
The current converts part of the chloride ions into chlorine, forms hypochlorous acid with continuous sterilization effect in the cooling water, and simultaneously generates ozone, oxygen free radicals, hydroxyl free radicals and hydrogen peroxide.
Furthermore, in step ②, the multi-stage countercurrent reverse-electrode electrodialysis generates 60% of fresh water for recycling circulating water, and generates 40% of concentrated water to be sent to the water inlet of the electrochemical sterilization and descaling device.
Further, the utility model discloses in, the suitable scope of the raw water quality of circulating water is: the total hardness is 100-1000mg/L, the total alkalinity is 50-500mg/L, and the Cl-concentration is 20-400 mg/L.
Compared with the prior art, the beneficial effects of the utility model are that:
1) the electrochemical treatment system is used for treating the circulating water raw water and the sewage concentrated water of the reverse electrodialysis, the addition of a scale inhibitor, a corrosion inhibitor and a sterilization algicide is avoided, the deposition and discharge of scaling and microorganism slime in water can be promoted through an electrochemical process of an electrode area and an electric control scraper, the concentration rate is greatly improved, and the effect of near zero emission is achieved;
2) the water produced by the electrochemical system is deeply treated by utilizing the reverse electrodialysis operation, so that the overall treatment efficiency is improved. The electrodialysis membrane is prevented from being polluted by reverse operation, the operation efficiency is improved, and the cost is reduced;
3) the electrochemical treatment system adopts a high-efficiency titanium-based alloy electrode, the treatment effect is greatly improved compared with a chemical agent method, the concentration rate can at least reach 6, water can be saved by more than 60%, and the cleaning frequency of a heat exchanger is obviously reduced;
4) the process is simple, the structure is compact, the circulating water bypass treatment is carried out, and the large-area reconstruction of the original circulating water system of the power plant is not needed. The whole treatment system is mainly driven by electricity, so that cheap auxiliary electricity in a power plant can be fully utilized, and the operation cost is saved.
Drawings
The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic structural diagram of a circulating water treatment system of a power plant including an electrochemical sterilization and descaling device and an electrodialysis device.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
The following detailed description is exemplary in nature and is intended to provide further details of the invention. Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the invention.
Referring to fig. 1, the utility model provides a power plant circulating water treatment system comprising an electrochemical sterilization descaling device and an electrodialysis device, which comprises the electrochemical sterilization descaling device and the electrodialysis device;
the water inlet of the electrochemical sterilization and descaling device is connected with the water outlet of the circulating water bypass, and the water outlet of the electrochemical sterilization and descaling device is connected with the water inlet of the electrodialysis device; and a concentrated water outlet of the electrodialysis device is connected with a water inlet of the electrochemical sterilization and descaling device, and a fresh water outlet of the electrodialysis device is connected with a circulating water return pipe.
The electrochemical sterilization descaling device comprises a cathode reaction area, an anode reaction area and an electric control descaling system, and is designed in a container type.
The electrochemical sterilization descaling device is provided with a sludge discharge port, and the sludge discharge port is connected with sludge dewatering equipment through a pipeline.
The cathode of the electrochemical sterilization and descaling device adopts a high-efficiency titanium-based coating electrode; the anode of the electrochemical sterilization and descaling device adopts a Ru-Ir alloy coating electrode.
The electrochemical sterilization and descaling device adopts a cathode protection strategy, and a power supply system enables a cathode to be in a negative electricity protection state.
The electrodialysis device is a multistage countercurrent reverse Electrodialysis (EDR).
The utility model relates to a when power plant's circulating water treatment system including electrochemistry scale removal device and electrodialysis device that disinfects carries out power plant's circulating water treatment, including following step:
① the circulating water is led out from the cooling tower blowdown bypass, enters the electrochemical sterilization descaling device, and the water produced by the electrochemical treatment enters the water inlet of the electrodialysis device;
② the concentrated water of the electrodialysis device enters the electrochemical treatment unit, and the fresh water of the electrodialysis device is returned to the circulating water cooling tower as the circulating water reuse water.
In step ①, the electrochemical sterilization and descaling device reacts in the cathode region as follows:
2H2O(g)+2e-→H2(g)+2OH-(aq)
high-concentration hydroxide radicals are gathered near the cathode region, the pH can reach 13, and scale formation ions such as calcium ions, bicarbonate ions and the like in water form precipitates:
Ca2+(aq)+2OH-(aq)→Ca(OH)2(Scale)
Ca2+(aq)+CO3 2-(aq)→CaCO3(Scale)
The scale substances are attached to the surface of the cathode;
in step ①, the electrochemical processing unit reacts in the anode region as follows:
oxygen generation 4HO-→O2(g)+2H2O+4e-
Free chlorine Cl-–e-→Cl0
Chlorine 2Cl-(aq)→Cl2(g)+2e-
Ozone O2+2HO-–2e-→O3(g)+H2O
Hydroxyl radical OH-–e-→OH0
Peroxy compoundHydrogen hydride 2H2O–2e-→H2O2+2H+
Oxygen free radical 2H2O–2e-→O0+2H+
The current converts part of the chloride ions into chlorine, forms hypochlorous acid with continuous sterilization effect in the cooling water, and simultaneously generates ozone, oxygen free radicals, hydroxyl free radicals and hydrogen peroxide.
In the step ②, the electrodialysis device adopts multi-stage countercurrent reverse operation, which can effectively prevent the ion exchange membrane of the electrodialysis device from being polluted and blocked.
In the step ②, the electrodialysis device is operated to generate about 60% of fresh water for recycling circulating water, and about 40% of concentrated water is sent to the water inlet of the electrochemical treatment unit.
The utility model discloses in, automatically controlled system control scraper strikes off scale deposit material and biological slime automatically, discharges harmful substance, reduces the inside scale deposit of circulating water system and the risk of corruption.
Example (b): the circulating water quantity of a certain 300MW water cooling unit is 36000m3The evaporation and wind blowing loss is about 385m3The main water quality indexes of the make-up water are as follows: the hardness content is 300mg/L, the alkalinity is 120mg/L, the chloride ion content is 110mg/L, the conductivity is 1300us/cm, an electrochemical treatment system is adopted, the concentration rate can reach 6 times, the water discharge is reduced by 75 percent compared with the chemical agent method (3 times concentration), and the water discharge meets the recycling standard of circulating water after being treated by electrodialysis. Through calculation, the electrochemical system can save the operation cost by about 800 ten thousand yuan per year compared with the traditional chemical treatment system.
It will be appreciated by those skilled in the art that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The embodiments disclosed above are therefore to be considered in all respects as illustrative and not restrictive. All changes which come within the scope of the invention or which are equivalent to the scope of the invention are embraced by the invention.
Claims (6)
1. A power plant circulating water treatment system comprising an electrochemical sterilization and descaling device and an electrodialysis device is characterized by comprising:
an electrochemical sterilization and descaling device; the water inlet of the electrochemical sterilization and descaling device is connected with the water outlet of the power plant circulating water bypass;
an electrodialysis unit; the water inlet of the electrodialysis device is connected with the water outlet of the electrochemical sterilization and descaling device; the electrodialysis device comprises a fresh water outlet and a concentrated water outlet;
the concentrated water outlet of the electrodialysis device is connected with the water inlet of the electrochemical sterilization and descaling device, and the fresh water outlet of the electrodialysis device is connected with the circulating water return pipe of the power plant.
2. The power plant circulating water treatment system comprising the electrochemical sterilization and descaling device and the electrodialysis device according to claim 1, wherein the electrochemical sterilization and descaling device comprises a cathode reaction zone, an anode reaction zone and an electrically-controlled scale scraping system; the electrically controlled scale scraping system is used for scraping scale formed in the cathode reaction zone.
3. The power plant circulating water treatment system comprising the electrochemical sterilization and descaling device and the electrodialysis device as claimed in claim 1, wherein the electrochemical sterilization and descaling device is provided with a sludge discharge port, and the sludge discharge port is connected with a sludge dewatering device through a pipeline.
4. The power plant circulating water treatment system comprising the electrochemical sterilization and descaling device and the electrodialysis device as claimed in claim 2, wherein the cathode of the electrochemical sterilization and descaling device is a titanium-based coated electrode; the anode of the electrochemical sterilization and descaling device adopts a Ru-Ir alloy coating electrode.
5. The power plant circulating water treatment system comprising the electrochemical sterilization and descaling device and the electrodialysis device according to claim 1, wherein the electrodialysis device is a multi-stage counter-current reverse-electrode electrodialysis device.
6. The power plant circulating water treatment system comprising the electrochemical sterilization and descaling device and the electrodialysis device according to claim 1, further comprising a cooling tower; the water outlet of the cooling tower is connected with the water inlet of the sludge dewatering equipment through a power plant circulating water drain pipe, and the water outlet of the sludge dewatering equipment is connected with the water return port of the cooling tower through a power plant circulating water return pipe to form a power plant circulating water loop; the inlet of the power plant circulating water bypass is communicated with a power plant circulating water drain pipe; the cooling tower is also connected with a water replenishing pipe.
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| CN201920912151.2U CN210122508U (en) | 2019-06-17 | 2019-06-17 | Power plant circulating water treatment system comprising electrochemical sterilization and descaling device and electrodialysis device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110182973A (en) * | 2019-06-17 | 2019-08-30 | 中国华能集团有限公司 | A kind of power plant cycle water treatment system and method including electrochemical sterilization apparatus for eliminating sludge and electrodialysis plant |
| CN111423035A (en) * | 2020-05-07 | 2020-07-17 | 西安西热水务环保有限公司 | Chemical-free electric method combined treatment process system and method for circulating water of thermal power plant |
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| US11502323B1 (en) | 2022-05-09 | 2022-11-15 | Rahul S Nana | Reverse electrodialysis cell and methods of use thereof |
| US11855324B1 (en) | 2022-11-15 | 2023-12-26 | Rahul S. Nana | Reverse electrodialysis or pressure-retarded osmosis cell with heat pump |
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- 2019-06-17 CN CN201920912151.2U patent/CN210122508U/en active Active
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110182973A (en) * | 2019-06-17 | 2019-08-30 | 中国华能集团有限公司 | A kind of power plant cycle water treatment system and method including electrochemical sterilization apparatus for eliminating sludge and electrodialysis plant |
| CN111423035A (en) * | 2020-05-07 | 2020-07-17 | 西安西热水务环保有限公司 | Chemical-free electric method combined treatment process system and method for circulating water of thermal power plant |
| CN111423035B (en) * | 2020-05-07 | 2024-04-26 | 西安西热水务环保有限公司 | Combined treatment process system and method for circulating water of thermal power plant through chemical-free electrotechnology |
| US11502322B1 (en) | 2022-05-09 | 2022-11-15 | Rahul S Nana | Reverse electrodialysis cell with heat pump |
| US11502323B1 (en) | 2022-05-09 | 2022-11-15 | Rahul S Nana | Reverse electrodialysis cell and methods of use thereof |
| US11563229B1 (en) | 2022-05-09 | 2023-01-24 | Rahul S Nana | Reverse electrodialysis cell with heat pump |
| US11611099B1 (en) | 2022-05-09 | 2023-03-21 | Rahul S Nana | Reverse electrodialysis cell and methods of use thereof |
| US11699803B1 (en) | 2022-05-09 | 2023-07-11 | Rahul S Nana | Reverse electrodialysis cell with heat pump |
| US11855324B1 (en) | 2022-11-15 | 2023-12-26 | Rahul S. Nana | Reverse electrodialysis or pressure-retarded osmosis cell with heat pump |
| US12040517B2 (en) | 2022-11-15 | 2024-07-16 | Rahul S. Nana | Reverse electrodialysis or pressure-retarded osmosis cell and methods of use thereof |
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