CN110615507A - Circulating cooling water treatment equipment and circulating cooling water treatment method - Google Patents
Circulating cooling water treatment equipment and circulating cooling water treatment method Download PDFInfo
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- CN110615507A CN110615507A CN201911050579.1A CN201911050579A CN110615507A CN 110615507 A CN110615507 A CN 110615507A CN 201911050579 A CN201911050579 A CN 201911050579A CN 110615507 A CN110615507 A CN 110615507A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/4602—Treatment of water, waste water, or sewage by electrochemical methods for prevention or elimination of deposits
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/4606—Treatment of water, waste water, or sewage by electrochemical methods for producing oligodynamic substances to disinfect the water
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/46104—Devices therefor; Their operating or servicing
- C02F1/46109—Electrodes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/46104—Devices therefor; Their operating or servicing
- C02F1/46109—Electrodes
- C02F2001/46133—Electrodes characterised by the material
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/02—Non-contaminated water, e.g. for industrial water supply
- C02F2103/023—Water in cooling circuits
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/46—Apparatus for electrochemical processes
- C02F2201/461—Electrolysis apparatus
- C02F2201/46105—Details relating to the electrolytic devices
- C02F2201/46115—Electrolytic cell with membranes or diaphragms
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/04—Flow arrangements
- C02F2301/043—Treatment of partial or bypass streams
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/04—Disinfection
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/08—Corrosion inhibition
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/14—Maintenance of water treatment installations
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/22—Eliminating or preventing deposits, scale removal, scale prevention
Abstract
The invention provides a circulating cooling water treatment device and a circulating cooling water treatment method, wherein the device comprises a shell serving as a cathode, wherein a descaling anode and a disinfection anode are arranged in the shell, a first water-blocking diaphragm is sleeved on the periphery of the disinfection anode, and a disinfection gas generation chamber is formed in the first water-blocking diaphragm; a sterilizing component is arranged outside the shell, a sterilizing gas transfer cavity and a salt storage cavity are arranged inside the sterilizing component, and a gas pipe and a return pipe are respectively arranged between the sterilizing gas transfer cavity and the sterilizing gas generating chamber; the top of the sterilizing gas transferring cavity is provided with a gas transmission port; the bottom of the shell is provided with a rotating shaft, scrapers are circumferentially distributed on the rotating shaft, and the bottom of the shell is also provided with a driving device; the bottom of the inner cavity of the shell is communicated with a sewage discharge pipeline, a sewage discharge valve is arranged on the sewage discharge pipeline, and an electric cabinet is arranged outside the shell. The circulating cooling water treatment equipment can comprehensively and efficiently treat circulating cooling water and ensure the stable and balanced water quality.
Description
Technical Field
The invention belongs to the field of circulating cooling water treatment, and particularly relates to circulating cooling water treatment equipment and a circulating cooling water treatment method.
Background
The circulating cooling water system is a water supply system which takes water as a cooling medium, consists of heat exchange equipment, cooling equipment, a water pump, a pipeline and other related equipment and is recycled. The side-stream water is the water which is branched from the circulating cooling water system and is returned to the circulating cooling water system after being treated.
The cooling tower and the heat exchanger are used as very important corollary equipment in modern industrial production, the cooling tower and the heat exchanger are communicated and cooperatively operated by a circulating cooling water system, and under the normal condition, circulating cooling water exchanges heat through the heat exchanger or exchanges medium heat in a direct contact heat exchange mode, and is cooled by the cooling tower and recycled to save water resources. In general, the circulating water is neutral and weakly alkaline, and the pH value is controlled between 7 and 9.5. After the circulating water is cooled by the cooling tower (generally, 1-2% of the circulating water is evaporated, the temperature of the remaining 98-99% of the circulating water can be reduced by 5-10 ℃), and the circulating water returns to the heat exchanger to absorb heat, so that the circulating water is not circulated. Pure water is evaporated in the water circulation process, the salt in the water is continuously concentrated, and the concentration of dissolved salt is continuously increased. When the concentration of the insoluble salt or the slightly soluble salt reaches above the saturated concentration, the insoluble salt or the slightly soluble salt is crystallized and precipitated to form scale, for example, calcium carbonate is the most common scale in circulating water. Meanwhile, the temperature of circulating water in the cooling tower is about 30 ℃ generally, and the breeding of microorganisms is also a common problem in the circulating water; in addition, local corrosion of components, which is usually caused by high activity of local anode potential, occurs during long-term operation of the equipment, and is caused by unequal ion concentration or difference in oxygen concentration. Often found in high temperature zones, lattice defects, cutting sites, surface scratches or cracks. Accordingly, pitting corrosion is the most common cause of metal damage, and a perforation in the assembly structure can destroy a critical heat exchanger, thereby causing a shutdown of the entire plant.
In summary, the main contents of the current cooling water treatment are corrosion inhibition, scale inhibition, biocidal and slime prevention. However, these problems are closely related and cannot be solved by a single agent, but must be treated as a whole. Correspondingly, a plurality of treatment methods and process flows aiming at the circulating cooling water exist in the prior art, but the prior art is limited by the technical means and the corresponding equipment structure, and generally only has one to two technical effects of descaling, sterilization, algae removal and the like, two electrode reactions in each electrochemical process cannot be simultaneously utilized, so that the current efficiency is reduced, the problems of scaling, corrosion, microorganisms, suspended matters and the like in the circulating cooling water cannot be comprehensively solved, the water quality balance and treatment effect of the cooling circulating water are severely restricted, and the adverse effect is caused on the stable and efficient operation of the cooling tower, a heat exchanger and other related system equipment.
Therefore, it is an important technical problem to be solved by those skilled in the art to provide a circulating cooling water treatment apparatus, which utilizes all electrochemical reactions of electrochemical processes to comprehensively and efficiently treat circulating cooling water and ensure stable and balanced water quality.
Disclosure of Invention
In view of the above, the present invention is directed to a recirculated cooling water treatment apparatus and a recirculated cooling water treatment method, which can treat recirculated cooling water comprehensively and efficiently and ensure stable and balanced water quality.
The invention provides a circulating cooling water treatment device, which comprises a shell as a cathode;
the cathode is used as a common cathode in the whole electrochemical process and is connected with the negative electrode of an electrolysis power supply;
the lower part of the shell is provided with a water inlet which is communicated with an upstream circulating water pipeline;
the upper part of the shell is provided with a water outlet which is communicated with a downstream circulating water pipeline;
a descaling anode and a disinfection anode which extend along the vertical direction are arranged in the shell; a first water-blocking diaphragm is sleeved on the periphery of the disinfection anode, and a disinfection gas generation chamber is formed inside the first water-blocking diaphragm;
a sterilizing component is arranged outside the shell, and a sterilizing gas transfer cavity and a salt storage cavity which are connected in a break-make manner are arranged inside the sterilizing component; a gas pipe and a return pipe are respectively arranged between the sterilizing gas transfer cavity and the sterilizing gas generating chamber; the gas transmission pipe is used for guiding the sterilizing gas generated by the sterilizing gas generating chamber into the sterilizing gas transfer cavity; the lower part of the sterilizing gas transfer cavity is provided with a saline solution temporary storage chamber which is communicated with the saline storage cavity; the return pipe is used for guiding the saline solution in the saline solution temporary storage chamber into the sterilizing gas generating cavity;
the top of the sterilizing gas transferring cavity is provided with a gas transmission port; the gas transmission port is communicated with a circulating water pipeline through an ejector;
the bottom of the shell is provided with a rotating shaft extending along the vertical direction, a plurality of scrapers which are fit with the inner wall of the shell are circumferentially arranged on the rotating shaft, the scrapers are positioned between the inner wall of the shell and each anode along the radial direction of the shell, and the bottom of the shell is also provided with a driving device which can drive the rotating shaft to rotate;
the bottom of the inner cavity of the shell is communicated with a sewage discharge pipeline, a sewage discharge valve is arranged on the sewage discharge pipeline, and an electric cabinet is further arranged outside the shell.
Preferably, a corrosion and scale inhibition anode is further arranged inside the shell along the vertical direction; the corrosion and scale inhibition anode is an aluminum-magnesium-zinc alloy anode.
Preferably, a reflux pump is arranged on the reflux pipe.
Preferably, a second water-blocking diaphragm is sleeved on the periphery of the descaling anode; the second water-blocking membrane is communicated with the inner cavity of the shell.
Preferably, a flow guide pipe is communicated with the downstream of the return pipe; the guide pipe is inserted in the sterilizing gas generating chamber.
Preferably, the descaling anode and the disinfection anode are both DSA anodes.
Preferably, the driving means is a motor.
Preferably, the first water-blocking membrane is an ion-permselective membrane.
The invention provides a treatment method of circulating cooling water, which comprises the following steps:
and introducing a part of the circulating cooling water to be treated into the circulating cooling water treatment equipment in the technical scheme through a water inlet in a bypass flow mode, descaling, generating a disinfection substance and sterilizing in the shell, and returning to a circulating cooling water system to obtain the treated circulating cooling water.
Preferably, the shell also releases corrosion and scale inhibition ions.
Compared with the background technology, in the working and running process of the circulating cooling water treatment equipment provided by the invention, all electrochemical processes of descaling, generating sterilizing gas, releasing corrosion and scale inhibition ions and the like share one cathode; the working personnel controls all the components to work cooperatively through the electric cabinet, under the action of current, the surface of the disinfection anode is contacted with the saline solution input by the backflow pipe and generates oxidation reaction to generate disinfection gas, the disinfection gas is conveyed into the disinfection gas transfer cavity through the gas conveying pipe, then the disinfection gas escapes from the disinfection gas transfer cavity and is conveyed into the circulating water pipeline through the gas conveying port so as to disinfect the circulating water, the first water-blocking diaphragm can effectively block the liquid communication between the disinfection gas generation chamber and the circulating water in the inner cavity of the shell, and anions in the circulating water are allowed to pass through and enter the disinfection gas generation chamber so as to participate in related electrochemical reaction, so that the stable generation of the disinfection gas is ensured; in addition, equipment long-term operation back, accessible drive arrangement drive pivot rotates to drive each scraper linkage and rotate, so that will be attached to the whole clearance of scraping such as incrustation scale and impurity on the shells inner wall, and regularly open the blowoff valve, so that above-mentioned incrustation scale etc. are discharged via the sewage pipes. Recirculated cooling water treatment facility has realized many-sided coprocessing such as disinfection, scale removal and antiseized mud deposit to recirculated cooling water through the cooperation of scale removal positive pole and disinfection positive pole subassembly, and the treatment effeciency is higher, and the treatment effect is better, can fully guarantee recirculated cooling water's water quality balance and stability to make the stable continuous operation of relevant equipment such as cooling tower and heat exchanger fully ensured.
An ejector is arranged at the gas delivery port; during the equipment operation, negative pressure environment is formed when recirculated cooling water flows through this ejector to can send into the sterilizing gas suction of sterilizing gas transfer intracavity in the circulating line way, and then improve the mixing efficiency between sterilizing gas and recirculated cooling water by a wide margin, with the disinfection treatment effect of further assurance recirculated cooling water.
In another preferred scheme of the invention, through the cooperative cooperation of the descaling anode and the corrosion and scale inhibition anode, a sterilization and algae removal substance is generated on the surface of the descaling anode, and simultaneously, the corrosion and scale inhibition anode releases quantitative metal ions into circulating water under the action of current, thereby achieving the dual functions of reducing corrosion and preventing scale formation.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic view of an overall structure of a circulating cooling water treatment apparatus according to an embodiment of the present invention.
The device comprises a shell 11, a water inlet 111, a water outlet 112, a descaling anode 12, a disinfection anode 13, a first water-blocking diaphragm 131, a disinfection gas generation chamber 132, a corrosion and scale inhibition anode 14, a disinfection component 15, a disinfection gas transferring cavity 151, a salt storage cavity 152, a gas transmission port 153, an ejector 154, a gas transmission pipe 161, a return pipe 162, a return pump 163, a flow guide pipe 164, a rotating shaft 17, a scraper 171, a driving device 172, a sewage discharge pipeline 18, a sewage discharge valve 181 and an electric cabinet 19.
Detailed Description
The invention provides a circulating cooling water treatment device, which comprises a shell as a cathode;
the cathode is a cathode common to all electrochemical processes and is connected with the cathode of an electrolysis power supply;
the lower part of the shell is provided with a water inlet which is communicated with an upstream circulating water pipeline;
the upper part of the shell is provided with a water outlet which is communicated with a downstream circulating water pipeline;
a descaling anode and a disinfection anode which extend along the vertical direction are arranged in the shell; a first water-blocking diaphragm is sleeved on the periphery of the disinfection anode, and a disinfection gas generation chamber communicated with the inner cavity of the shell is formed inside the first water-blocking diaphragm;
a sterilizing component is arranged outside the shell, and a sterilizing gas transferring cavity and a salt storage cavity which are connected in a switching manner are arranged inside the sterilizing component; a gas pipe and a return pipe are respectively arranged between the sterilizing gas transfer cavity and the sterilizing gas generating chamber; the gas transmission pipe is used for guiding the sterilizing gas generated by the sterilizing gas generating chamber into the sterilizing gas transferring cavity of the sterilizing gas transferring cavity; the lower part of the sterilizing gas transfer cavity is provided with a saline solution temporary storage chamber which is communicated with the saline storage cavity; the return pipe is used for guiding the saline solution in the saline solution temporary storage chamber into the sterilizing gas generating cavity;
the top of the sterilizing gas transferring cavity is provided with a gas transmission port; the gas transmission port is communicated with a circulating water pipeline through an ejector;
the bottom of the shell is provided with a rotating shaft extending along the vertical direction of the axis, a plurality of scrapers which are fit with the inner wall of the shell are circumferentially arranged on the rotating shaft, the scrapers are positioned between the inner wall of the shell and each anode along the radial direction of the shell, and the bottom of the shell is also provided with a driving device which can drive the rotating shaft to rotate;
the bottom of the inner cavity of the shell is communicated with a sewage discharge pipeline, a sewage discharge valve is arranged on the sewage discharge pipeline, and an electric cabinet is further arranged outside the shell.
In one embodiment, the recirculated cooling water treatment device provided by the present invention comprises a housing 11 as a cathode, wherein the lower part of the housing 11 has a water inlet 111 communicated with an upstream recirculated water pipeline, the upper part of the housing 11 has a water outlet 112 communicated with a downstream recirculated water pipeline, the inside of the housing 11 is provided with a descaling anode 12 and a disinfection anode 13 extending along the axis vertical direction, the outer circumferential part of the disinfection anode 13 is sleeved with a first water-blocking membrane 131, and the inside of the first water-blocking membrane 131 forms a disinfection gas generation chamber 132 communicated with the inner cavity of the housing 11; a disinfection component 15 is arranged outside the shell 11, a disinfection gas transfer cavity 151 and a salt storage cavity 152 which are connected in a switching way are arranged inside the disinfection component 15, and the top of the disinfection gas transfer cavity is provided with a gas transmission port; the gas transmission port is communicated with a circulating water pipeline through an ejector 154; a gas pipe 161 for introducing the sterilizing gas from the sterilizing gas generating chamber 132 into the sterilizing gas transfer chamber 151 and a return pipe 162 for introducing the saline solution from the sterilizing gas transfer chamber 151 into the sterilizing gas generating chamber 132 are respectively communicated between the sterilizing gas transfer chamber 151 and the sterilizing gas generating chamber 132, and a gas transmission port 153 communicated with a circulating water pipeline is arranged at the top of the sterilizing gas transfer chamber 151; the lower part of the sterilizing gas transfer cavity is provided with a saline solution temporary storage chamber which is communicated with the saline storage cavity; the return pipe is used for guiding the salt solution in the temporary storage chamber into the sterilizing gas generating chamber preferably through the return pump; a rotating shaft 17 extending along the vertical direction of the axis is arranged at the bottom of the shell 11 in a fixed-shaft rotatable manner, a plurality of scrapers 171 fitted and matched with the inner wall of the shell 11 are circumferentially arranged on the rotating shaft 17, the scrapers 171 are positioned between the inner wall of the shell 11 and each anode along the radial direction of the shell 11, and a driving device 172 capable of driving the rotating shaft 17 to rotate is further arranged at the bottom of the shell 11; the bottom of the inner cavity of the shell 11 is communicated with a sewage discharge pipeline 18, a sewage discharge valve 181 is arranged on the sewage discharge pipeline 18, and an electric cabinet 19 is arranged outside the shell 11.
In the present invention, hardness removal and sterilization are the two most basic functions of the aqueous solution electrolysis process. Three problems common in circulating water systems are fouling (caused by hardness), corrosion and microorganisms. The corrosion problem is related to the material of a heat exchanger in a circulating water system, and corrosion can be controlled within a reasonable range by maintaining proper water quality at some time, so that the slow-release scale inhibition anode 14 is not needed. For example, in the embodiment, the water supplement is tap water from Beijing, the heat exchanger is made of red copper, the pipeline is made of carbon steel, and the corrosion rate can be controlled within a specified range as long as the hardness and alkalinity of the circulating water are maintained at appropriate levels. The problems of sterilization, scaling, corrosion retarding and the like can be solved without using a slow-release electrode.
However, fouling is related to the temperature on the feed side of the heat exchanger, with higher temperatures being more prone to fouling. Therefore, another function of the sustained-release electrode is to prevent high-temperature scaling. For example, in a large air compressor, when the air temperature is high in summer, the temperature of the compressed air is higher and sometimes reaches more than 80 ℃, water used for cooling the compressed air, particularly in areas with higher hardness, is easy to scale, and zinc ions and magnesium ions released by the slow-release electrodes can play a role in inhibiting scale.
In some situations, such as southern water where water quality is relatively soft, corrosion and microbial growth of the system are major problems and hardness is a minor problem. After corrosion and microorganisms are controlled, the stability of water quality can be ensured (no scaling, corrosion and microorganism control are in a reasonable range) by removing certain hardness, and at the moment, the three electrode descaling anode, the disinfection anode and the corrosion and scale inhibition anode 14 need to be used simultaneously. Southern microorganisms are more prone to breed because of the lack of disinfection anodes due to low chloride ion and insufficient production of bactericidal substances. The water quality in the south is also corroded, and corrosion inhibition measures are required. If the drainage is less, the scale substances are accumulated and increased continuously, and the hardness removal is ensured.
Under any condition, the corrosion and scale inhibition anode is beneficial to the treatment of the circulating cooling water and has the functions of corrosion inhibition and scale prevention, and after the corrosion and scale inhibition anode is used, the electrolytic current is large, and the hardness removal amount is increased; and the flocculation effect of ions released by the corrosion inhibition electrode is added, so that the sterilization effect is better. From an economic perspective, increasing the electrodes and operating current results in increased operating costs. Therefore, the three electrodes are combined according to actual needs, and the requirements of both technology and economy are met.
During the operation, the working personnel controls the components to work cooperatively through the electric cabinet 19, and through the cooperative cooperation of the descaling anode 12 and the corrosion and algae removal anode 14, the sterilization and algae removal substances are generated on the surface of the descaling anode 12, and simultaneously the corrosion and algae removal anode 14 releases a certain amount of metal ions to the water in the shell 11 under the action of current to reach the circulating water system, so as to achieve the dual functions of corrosion retarding and scale formation retarding, and simultaneously, under the action of current, the surface of the disinfection anode 13 is contacted with the salt solution input by the return pipe 162 and generates an oxidation reaction to generate disinfection gas, and the disinfection gas is conveyed into the disinfection gas transfer cavity 151 through the gas conveying pipe 161, and then the disinfection gas escapes from the disinfection gas transfer cavity 151 and is conveyed into the circulating water pipeline through the gas conveying port 153, so as to implement the disinfection treatment on the circulating water, the first water-blocking diaphragm 131 can effectively block the liquid communication between the disinfection gas generation chamber 132 and the circulating water in, and allows the anions in the circulating water to pass through and enter the sterilizing gas generating chamber 132 so as to participate in relevant electrochemical reactions, thereby ensuring the stable and efficient generation of the sterilizing gas; in addition, after the device is operated for a long time, the driving device 172 can drive the rotating shaft 17 to rotate, so as to drive each scraper 171 to rotate in a linkage manner, so that the whole body of scale and impurities attached to the inner wall of the shell 11 can be scraped and cleaned, and the drain valve 181 is periodically opened, so that the scale and the impurities can be discharged through the drain pipeline 18. The first water-blocking membrane 131 is preferably an ion-permselective membrane; the water permeability of the ion selective permeable membrane is very low, and only ions pass through the membrane under the action of an electric field; specifically, the first water blocking membrane 131 may be nafion n966 or flemion f 865. The circulating cooling water treatment equipment comprehensively and thoroughly realizes the cooperative treatment in multiple aspects such as disinfection, descaling, corrosion and scale inhibition, anti-adhesion mud deposition and the like of circulating cooling water through the cooperative matching of the anode assemblies, has higher treatment efficiency and better treatment effect, can fully ensure the water quality balance and stability of the circulating cooling water, and fully ensures the stable and continuous operation of relevant equipment such as a cooling tower, a heat exchanger and the like.
It should be noted that, in consideration of the actual treatment effect and the corresponding equipment operation cost, the salt in the salt storage cavity 152 is preferably sodium chloride, accordingly, the salt solution introduced into the sterilizing gas generating chamber 132 is a sodium chloride solution, the sterilizing gas generated by the sterilizing gas generating chamber 132 is chlorine, and meanwhile, the first water-blocking diaphragm 131 is adopted to enable the sterilizing gas generating chamber 132 to enrich the chloride ions in the circulating cooling water and convert the enriched chloride ions into chlorine and hypochlorous acid in a centralized manner, so that the bacterial growth in the water body can be continuously inhibited, the concentration of the chloride ions in the circulating cooling water can be effectively reduced, and the corrosion risk of parts caused by the chloride ions can be reduced; in addition, the water body near the disinfection anode 13 is electrolyzed to generate oxygen and oxygen radicals, and the oxygen radicals react with water and dissolved oxygen in the water to generate ozone, so that the disinfection environment in the cavity is maintained.
The chemical reaction at the disinfection anode 13 described above is described as follows:
generating oxygen:
4HO-→O2(g)+2H2O+4e-(ii) a Free chlorine:
Cl-–e-→Cl；
chlorine gas:
2Cl-(aq)→Cl2(g)+2e-；
ozone:
O2+2HO--2e-→O3(g)+H2O；
free radical OH:
OH-–e-→OH；
hydrogen peroxide:
2H2O–2e-→H2O2+2H+。
oxygen radical:
2H2O–2e-→O+2H+。
in addition, the housing 11 serves as a cathode and is shared by all electrochemical processes corresponding to the above anodes, specifically, in practical application, the descaling anode 12 and the disinfection anode 13 are preferably DSA (dimensional stability anode) anodes so as to prevent excessive anode loss after long-term operation of the equipment and reduce the equipment use cost, meanwhile, the corrosion and scale inhibition anode 14 is an aluminum-magnesium-zinc alloy anode so as to further ensure the corrosion-retarding effect and the corresponding treatment cost, the zinc ion concentration in the liquid during the reaction process is preferably 1.5ppm to 4ppm, more preferably 2 to 4ppm, and LSI (langerli saturation index) in the liquid environment is usually controlled within 1.5 so as to obtain the optimal corrosion inhibition effect and prevent scaling in a high-temperature area.
On the basis of this, in the vicinity of the cathode, the aqueous solution is electrically connectedBy decomposition to OH-And (3) obtaining a strong alkaline solution with the pH value of 14 at the interface layer near the cathode, wherein calcium carbonate and magnesium hydroxide are in a supersaturated state at the interface layer, the calcium carbonate and the magnesium hydroxide are rapidly crystallized on the surface of the cathode and the interface layer, and partial scale crystals are deposited and separated on the surface of the cathode, so that the subsequent scraper 171 can intensively scrape and clean.
Accordingly, the electrochemical reaction at the inner wall of the housing 11, i.e., the cathode, is expressed as follows:
2H2O(l)+2e→H2(g)+2OH-(aq)
Ca2 +(aq) possible formation of calcium ions
Calcium hydroxide Ca (OH)2(Scale)
Calcium carbonate CaCO3(Scale) on the surface of the substrate.
Further, an ejector 154 is provided at the gas delivery port 153. In the equipment operation process, the negative pressure environment is formed when the recirculated cooling water flows through the ejector 154, so that the sterilizing gas in the sterilizing gas transfer cavity 151 can be efficiently sucked out and sent into a circulating water pipeline, and the mixing efficiency between the sterilizing gas and the recirculated cooling water is greatly improved, so that the sterilizing treatment effect of the recirculated cooling water is further ensured.
Specifically, the return pipe 162 is provided with a return pump 163. This backwash pump 163 can further increase the water conservancy diversion pressure in the back flow pipe 162, optimizes the water conservancy diversion effect to further improve the liquid circulation speed and the flow in the back flow pipe 162, guarantee the whole operating efficiency of equipment.
More specifically, a delivery pipe 164 inserted into the sterilizing gas generating chamber 132 is connected downstream of the return pipe 162. The fluid conduit 164 ensures that fluid in the fluid conduit 162 can be directly introduced into the fluid environment of the sterilizing gas generator 132, thereby further improving the mixing efficiency of the associated solutions and ensuring continuous and efficient implementation of the associated electrochemical reactions.
On the other hand, a second water-blocking membrane is sleeved on the outer periphery of the descaling anode 12, and the inside of the second water-blocking membrane is communicated with the inner cavity of the shell 11. The function of the second water-blocking membrane is substantially the same as that of the first water-blocking membrane 131, and reference is made to the above related description, and the relative position relationship between the second water-blocking membrane and the anode for descaling 12 is also similar to the above relative position relationship between the first water-blocking membrane 131 and the anode for disinfection 13, so although the second water-blocking membrane is not shown in the drawings, the relative position relationship between the mating members thereof can be directly referred to the relative position relationship between the first water-blocking membrane 131 and the mating members in fig. 1, and no further description is given here.
In addition, in practical application, the driving device 172 is a motor to ensure stable and efficient operation of the rotating shaft 17 and improve cooperative matching capability and control effect between the rotating shaft and the electric cabinet 19.
The invention provides a treatment method of circulating cooling water, which comprises the following steps:
and introducing a part of the circulating cooling water to be treated into the circulating cooling water treatment equipment in the technical scheme through a water inlet in a bypass flow mode, descaling, generating a disinfection substance and sterilizing in the shell, and returning to a circulating cooling water system to obtain the treated circulating cooling water.
The descaling anode and the disinfection anode can generate disinfection substances to disinfect the circulating cooling water. In the invention, in order to improve the descaling efficiency of the circulating cooling water, a corrosion and scale inhibition anode is preferably arranged in the shell to release corrosion and scale inhibition ions.
From a scale removal perspective, if the hardness of the makeup water (which may be tap water or river water) is too low, e.g., the makeup water hardness is below 50mg/L, the scale removal function needs to be weakened, the bactericidal, algicidal and corrosion-mitigating functions need to be enhanced, and the equipment configuration is adjusted accordingly. When the hardness range is 50-180 mg/L, a diaphragm is not needed to be arranged outside the descaling anode, and the descaling function can meet the requirement. When the hardness is more than 180mg/L, the descaling function needs to be strengthened, and the descaling efficiency can be improved by arranging the diaphragm outside the descaling anode. Furthermore, it is possible to provide a liquid crystal display device,the descaling requires alkalinity of HCO3 -In the case of HCO3 -The higher the descaling task, the heavier the equipment configuration is adjusted accordingly.
The device is used for treating the circulating cooling water, is simple and efficient, and can flexibly adjust the water quality problem to be solved according to the water quality and working conditions of different make-up water. The method can solve the problems of descaling, sterilization, algae removal, scale inhibition and corrosion inhibition at the same time.
In order to further illustrate the present invention, a circulating cooling water treatment apparatus and a circulating cooling water treatment method according to the present invention will be described in detail with reference to the following examples, which should not be construed as limiting the scope of the present invention.
Example 1
Circulating cooling water system of central air conditioner with circulating water volume of 850m3Per, system volume 50m3And supplementing municipal tap water. 2 electrochemical side-stream water treatment devices are arranged, and each water treatment device has 25m water3H, operating current 30A per unit. In the refrigeration season of 2018, the problems of scaling and corrosion are controlled to meet the specified requirements, but microorganisms are difficult to control, bacteria and algae grow in the water body, particularly moss grows at the outer edge of the filler of the cooling tower, and the water quality analysis data are shown in table 1. Wherein the cumulative removal rate of calcium hardness is 69% (the cumulative removal rate is obtained by dividing the difference between the make-up water calcium hardness and the chloride ion concentration ratio-the circulating water calcium hardness by the make-up water calcium hardness and the chloride ion ratio). The residual chlorine in the circulating water is generated by electrochemical by-pass water treatment equipment, the concentration is only 0.01mg/L, and the control on microorganisms is insufficient.
Table 1: water quality analysis in 2018
In 2019, in 5 months, an electrochemical by-pass flow treatment device is modified and a disinfection gas generation chamber is additionally arranged. The water quality analysis data are shown in a table 2, the accumulated removal rate of calcium hardness reaches 81 percent, the removal rate is improved by 12 percent, the residual chlorine concentration in the circulating water is 0.1mg/L, which is 10 times of that before modification, and microorganisms in the inner part and the outer edge of the cooling tower are effectively controlled. The chlorine ions in the effluent of the sterilizing gas generating chamber are higher than those in the circulating water, and the content of residual chlorine reaches 5.2mg/L, which shows that the modified equipment not only generates residual chlorine, but also enriches part of the chlorine ions to convert the chlorine ions into residual chlorine.
Table 2: water quality analysis in 2019
Example 2
The circulating cooling water system of the welding workshop of the automobile factory has the circulating water quantity of 1050m3Per, system volume 500m3The average evaporation rate was 0.5%, and municipal tap water was supplemented. 2 electrochemical side-stream water treatment devices are arranged, and each water treatment device has the water quantity of 20m3H, operating current 20A per unit. The circulating cooling water system has no scaling phenomenon, microorganisms are in a control range, and the corrosion problem is prominent.
The water replenishing quality is shown in a table 3, the water replenishing LSI is a negative number, the RSI is more than 6, and a strong corrosion tendency exists; after the concentration is 6-8 times, the RSI of the circulating water is still larger than 6, and the corrosion tendency exists. The carbon steel coupon test also shows that the circulating water has corrosion phenomenon. Starting from 7 months and 3 days in 2017, each electrochemical device is provided with 4 descaling electrodes and 2 corrosion and scale inhibition electrodes, the zinc ion content is 2-4 mg/L on average, the carbon steel corrosion rate is 0.06mm/a, and the copper corrosion rate is 0.004 mm/a.
Table 3: quality analysis of circulating cooling water in welding workshop of automobile factory
According to the embodiment, in the working and running process of the circulating cooling water treatment equipment provided by the invention, a worker controls all the components to work cooperatively through the electric cabinet, under the action of current, the surface of the disinfection anode is contacted with the saline solution input through the return pipe and generates oxidation reaction to generate disinfection gas, the disinfection gas is conveyed into the disinfection gas transfer cavity through the gas conveying pipe, then the disinfection gas escapes from the disinfection gas transfer cavity and is conveyed into the circulating water pipeline through the gas conveying port to perform disinfection treatment on the circulating water, the first water-blocking diaphragm can effectively block liquid communication between the disinfection gas generation chamber and the circulating water in the inner cavity of the shell, and anions in the circulating water are allowed to pass through and enter the disinfection gas generation chamber so as to participate in related chemical reaction, and stable and efficient generation of the disinfection gas is ensured; in addition, equipment long-term operation back, accessible drive arrangement drive pivot rotates to drive each scraper linkage and rotate, so that will be attached to whole scraping clearance such as incrustation scale and impurity on shells inner wall, and regularly open the blowoff valve, so that above-mentioned incrustation scale thoroughly discharges via sewage pipes, clean with the water body environment of guaranteeing the casing inside. The circulating cooling water treatment equipment comprehensively and thoroughly realizes the multi-aspect cooperative treatment of the circulating cooling water such as disinfection, descaling, anti-sticking mud deposition and the like through the cooperative matching of the descaling anode and the disinfection anode assembly, has higher treatment efficiency and better treatment effect, can fully ensure the water quality balance and stability of the circulating cooling water, and fully ensures the stable and continuous operation of relevant equipment such as a cooling tower, a heat exchanger and the like.
And the gas transmission port is provided with a jet device. During the equipment operation, form negative pressure environment when recirculated cooling water flows through this ejector to can send into the circulating line with the high-efficient suction of the gaseous disinfection of gaseous transit intracavity, and then improve the mixing efficiency between gaseous disinfection and recirculated cooling water by a wide margin, with the disinfection treatment effect of further assurance recirculated cooling water.
In another preferred scheme of the invention, through the cooperative cooperation of the descaling anode and the corrosion and scale inhibition anode, a sterilization and algae removal substance is generated on the surface of the descaling anode, and simultaneously, the corrosion and scale inhibition anode releases quantitative metal ions into circulating water under the action of current, thereby achieving the dual functions of reducing corrosion and preventing scale formation.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A recirculated cooling water treatment apparatus is characterized by comprising a casing as a cathode;
the cathode is a cathode common to all electrochemical processes and is connected with the cathode of an electrolysis power supply;
the lower part of the shell is provided with a water inlet which is communicated with an upstream circulating water pipeline;
the upper part of the shell is provided with a water outlet which is communicated with a downstream circulating water pipeline;
a descaling anode and a disinfection anode which extend along the vertical direction are arranged in the shell; a first water-blocking diaphragm is sleeved on the periphery of the disinfection anode, and a disinfection gas generation chamber is formed inside the first water-blocking diaphragm;
a sterilizing component is arranged outside the shell, and a sterilizing gas transfer cavity and a salt storage cavity which are connected in a break-make manner are arranged inside the sterilizing component; a gas pipe and a return pipe are respectively arranged between the sterilizing gas transfer cavity and the sterilizing gas generating chamber; the gas transmission pipe is used for guiding the sterilizing gas generated by the sterilizing gas generating chamber into the sterilizing gas transfer cavity; the lower part of the sterilizing gas transfer cavity is provided with a saline solution temporary storage chamber which is communicated with the saline storage cavity; the return pipe is used for guiding the saline solution in the saline solution temporary storage chamber into the sterilizing gas generation chamber;
the top of the sterilizing gas transferring cavity is provided with a gas transmission port; the gas transmission port is communicated with a circulating water pipeline through an ejector;
the bottom of the shell is provided with a rotating shaft extending along the vertical direction of the axis, a plurality of scrapers which are fit with the inner wall of the shell are circumferentially arranged on the rotating shaft, the scrapers are positioned between the inner wall of the shell and each anode along the radial direction of the shell, and the bottom of the shell is also provided with a driving device which can drive the rotating shaft to rotate;
the bottom of the inner cavity of the shell is communicated with a sewage discharge pipeline, a sewage discharge valve is arranged on the sewage discharge pipeline, and an electric cabinet is further arranged outside the shell.
2. The circulating cooling water treatment equipment according to claim 1, wherein a corrosion and scale inhibition anode is further arranged in the shell along the vertical direction; the corrosion and scale inhibition anode is an aluminum-magnesium-zinc alloy anode.
3. The circulating cooling water treatment apparatus according to claim 1, wherein a reflux pump is provided to the reflux pipe.
4. The circulating cooling water treatment apparatus according to claim 1, wherein a second water-blocking diaphragm is sleeved on the outer periphery of the descaling anode; the second water-blocking membrane is communicated with the inner cavity of the shell.
5. The circulating cooling water treatment apparatus according to claim 1, wherein a flow guide pipe is connected to a downstream of the return pipe; the guide pipe is inserted in the sterilizing gas generating chamber.
6. The recirculated cooling water treatment apparatus of claim 1, wherein the descaling anode and the disinfection anode are both DSA anodes.
7. The circulating cooling water treatment apparatus according to claim 1, wherein the driving means is a motor.
8. The apparatus according to claim 1, wherein the first water-blocking membrane is an ion-selective permeable membrane.
9. A treatment method of circulating cooling water comprises the following steps:
introducing a part of the circulating cooling water to be treated into the circulating cooling water treatment equipment according to any one of claims 1 to 8 in a bypass flow mode through a water inlet, descaling, generating a disinfection substance and sterilizing in the shell, and returning to a circulating cooling water system to obtain the treated circulating cooling water.
10. The method of claim 9, wherein the housing further releases corrosion and scale inhibiting ions.
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