WO2021082305A1

WO2021082305A1 - Circulating cooling water treatment device and circulating cooling water treatment method

Info

Publication number: WO2021082305A1
Application number: PCT/CN2020/076335
Authority: WO
Inventors: 章明歅
Original assignee: 章明歅; 章俊杰
Priority date: 2019-10-31
Filing date: 2020-02-24
Publication date: 2021-05-06
Also published as: CN110615507B; CN110615507A

Abstract

The present 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, a descaling anode and a disinfection anode are arranged in the shell, a first water blocking diaphragm sleeves the outer peripheral part of the disinfection anode, and a disinfection gas generation chamber is formed in the first water blocking diaphragm; a disinfection assembly is arranged outside the shell, a disinfection gas transfer cavity and a salt storage cavity are formed in the disinfection assembly, and a gas delivery pipe and a return pipe are respectively arranged between the disinfection gas transfer cavity and the disinfection gas generation chamber; a gas inlet is formed in the top of the disinfection gas transfer cavity; a rotating shaft is arranged at the bottom of the shell, scrapers are arranged on the rotating shaft in the circumferential direction, a driving device is further arranged at the bottom of the shell; a sewage pipeline is communicated with the bottom of the inner cavity of the shell, a sewage valve is arranged on the sewage pipeline, and an electric control box is further arranged outside the shell. The circulating cooling water treatment device can comprehensively and efficiently treat the circulating cooling water and ensure stable and balanced water quality.

Description

Circulating cooling water treatment equipment and circulating cooling water treatment method

This application claims the priority of a Chinese patent application filed with the Chinese Patent Office, the application number is 201911050579.1, and the invention title is "a circulating cooling water treatment equipment and a circulating cooling water treatment method" on October 31, 2019, and its entire contents Incorporated in this application by reference.

Technical field

The invention belongs to the field of circulating cooling water treatment, and in particular to a circulating cooling water treatment equipment and a circulating cooling water treatment method.

Background technique

The circulating cooling water system is a water supply system that uses water as the cooling medium and is composed of heat exchange equipment, cooling equipment, water pumps, pipes and other related equipment, and is recycled. By-pass water is the part of water that is diverted from the circulating cooling water system and processed, and then returned to the circulating cooling water system.

Cooling towers and heat exchangers are very important supporting equipment in modern industrial production. They are connected and operated in coordination by a circulating cooling water system. Normally, the circulating cooling water exchanges heat through the heat exchanger or directly contacts the heat exchange method. After the heat of the medium is exchanged and cooled by the cooling tower, it is recycled to save water resources. In general, circulating water is neutral and weakly alkaline, and its pH value is generally controlled between 7-9.5. After the circulating water is cooled by the cooling tower (usually evaporating 1 to 2% can reduce the temperature of the remaining 98 to 99% of the water by 5 to 10°C), it returns to the heat exchanger to absorb heat, and the cycle continues. In the process of water circulation, pure water is evaporated, and the salt in the water will continue to be concentrated, and the concentration of dissolved salts will continue to rise. When the concentration of insoluble salt or slightly soluble salt reaches above the saturation concentration, it will crystallize out and become scale. For example, calcium carbonate is the most common scale in circulating water. At the same time, the temperature of the circulating water in the cooling tower is generally about 30°C. Microbial growth is also a common problem in circulating water. In addition, during the long-term operation of the equipment, local corrosion of components will also occur. This corrosion usually occurs in storage tanks and water delivery. In the system, there is a high active local anode potential. Corrosion is caused by unequal ion concentration or difference in oxygen concentration. It is often found in high temperature areas, lattice defects, cutting parts, surface scratches or cracks. Correspondingly, pitting corrosion is the most common cause of metal damage. A perforation in the component structure can destroy a critical heat exchanger, which in turn causes the entire plant to stop production.

In summary, the main content of current cooling water treatment is corrosion inhibition, scale inhibition, biocidal and anti-sludge. However, these issues are closely related, and one cannot rely on a single agent to solve the problem, but must be treated as a whole. Correspondingly, there are many treatment methods and process flows for circulating cooling water in the prior art, but these prior arts are limited by their own technical means and corresponding equipment structure, and usually only have one to one such as descaling, sterilization and algae killing. Two technical effects, the two electrode reactions in each electrochemical process cannot be used simultaneously, which reduces the current efficiency, and cannot fully solve the problems of scaling, corrosion, microorganisms, and suspended solids in the circulating cooling water, which severely restricts the cooling circulating water The water quality balance and treatment effect of the water quality adversely affect the stable and efficient operation of related system equipment such as cooling towers and heat exchangers.

Therefore, to provide a circulating cooling water treatment equipment that simultaneously utilizes all electrochemical reactions of the electrochemical process to comprehensively and efficiently treat the circulating cooling water and to ensure a stable and balanced water quality is an important technology that those skilled in the art need to solve. problem.

Summary of the invention

In view of this, the object of the present invention is to provide a circulating cooling water treatment equipment and a circulating cooling water treatment method, which can comprehensively and efficiently treat the circulating cooling water and ensure a stable and balanced water quality.

The present invention provides a circulating cooling water treatment equipment, which includes a casing as a cathode;

The cathode serves as a common cathode for all electrochemical processes, and the cathode is connected to the negative electrode of the electrolysis power supply;

The lower part of the housing is provided with a water inlet, and the water inlet is in communication with the upstream circulating water pipeline;

The upper part of the casing is provided with a water outlet, and the water outlet is in communication with the downstream circulating water pipeline;

The housing is provided with a descaling anode and a disinfecting anode extending in a vertical direction; the outer periphery of the disinfecting anode is sheathed with a first water blocking membrane, and the inside of the first water blocking membrane forms a disinfection gas generator. room;

A disinfection assembly is provided on the outside of the housing, and a disinfection gas transfer chamber and a salt storage chamber are provided in the disinfection assembly that can be connected in a disconnected manner; between the disinfection gas transfer chamber and the disinfection gas generation chamber The gas transmission pipe and the return pipe are respectively provided; the gas transmission pipe is used to introduce the disinfection gas generated in the disinfection gas generation chamber into the disinfection gas transfer chamber; the lower part of the disinfection gas transfer chamber is the salt solution temporary storage room, and the salt solution temporary storage room Communicate with the salt storage cavity; the return pipe is used to introduce the salt solution in the salt solution temporary storage room into the disinfection gas generating cavity;

The top of the sterilizing gas transfer cavity is provided with a gas transmission port; the gas transmission port is connected with a circulating water pipeline through a jet;

The bottom of the shell is provided with a rotating shaft extending in the vertical direction, and a number of scrapers that are appropriately fitted to the inner wall of the shell are arranged on the rotating shaft along the circumferential direction, and the scrapers are arranged along the inner wall of the shell. Radially located between the inner wall of the casing and each anode, and a driving device capable of driving the rotation shaft is also provided at the bottom of the casing;

The bottom of the inner cavity of the housing is connected with a sewage pipeline, the sewage pipeline is provided with a sewage valve, and an electric control box is also provided outside the housing.

Preferably, the inside of the casing is further provided with a corrosion and scale inhibition anode along the vertical direction; the corrosion and scale inhibition anode is an aluminum-magnesium-zinc alloy anode.

Preferably, a reflux pump is provided on the reflux pipe.

Preferably, a second water blocking membrane is sheathed on the outer periphery of the descaling anode; the second water blocking membrane is in communication with the inner cavity of the housing.

Preferably, a diversion tube is communicated downstream of the return pipe; the diversion tube is inserted in the disinfection gas generating chamber.

Preferably, the descaling anode and the disinfecting anode are both DSA anodes.

Preferably, the driving device is a motor.

Preferably, the first water blocking membrane is an ion selective permeation membrane.

The present invention provides a method for processing circulating cooling water, which includes the following steps:

A part of the circulating cooling water to be treated is passed into the circulating cooling water treatment equipment described in the above technical scheme in the form of side flow through the water inlet, and after descaling, generating disinfection substances and sterilization in the shell, it returns to the circulation Cooling water system to obtain treated circulating cooling water.

Preferably, the shell also releases corrosion and scale inhibition ions.

Compared with the above-mentioned background technology, the circulating cooling water treatment equipment provided by the present invention shares a cathode for all electrochemical processes such as descaling, generating disinfection gas, and releasing corrosion and scale ions during operation; the staff uses an electric control box The components are controlled to work together. Under the action of electric current, the surface of the disinfection anode contacts the salt solution input from the return pipe and undergoes an oxidation reaction to generate disinfection gas, and the disinfection gas is delivered to the disinfection gas transfer cavity through the gas pipe, and then the disinfection gas It escapes from the sterilization gas transfer cavity and is sent into the circulating water pipeline through the gas inlet to sterilize the circulating water. The first water blocking membrane can effectively block the sterilization gas generation chamber and the circulating water in the inner cavity of the housing. Liquid exchange, and allow the anions in the circulating water to pass through and enter the disinfection gas generation chamber to participate in the relevant electrochemical reaction and ensure the stable generation of the disinfection gas; in addition, after the equipment is running for a long time, the rotating shaft can be driven by the driving device to rotate, thereby driving the scrapers Linked rotation to scrape and clean the scale and impurities attached to the inner wall of the shell, and regularly open the drain valve to discharge the above-mentioned scale and the like through the drain pipeline. The circulating cooling water treatment equipment realizes the synergistic treatment of disinfection, descaling and anti-sludge deposition of circulating cooling water through the synergistic cooperation of the descaling anode and the disinfecting anode assembly, and the treatment efficiency is high, and the treatment effect is high. Better, it can fully ensure the water quality balance and stability of the circulating cooling water, and fully guarantee the stable and continuous operation of the cooling tower, heat exchanger and other related equipment.

The air delivery port is provided with an ejector; during the operation of the equipment, a negative pressure environment is formed when the circulating cooling water flows through the ejector, so that the sterilizing gas in the sterilizing gas transfer cavity can be sucked out and sent into the circulating water pipeline, and then The mixing efficiency between the disinfection gas and the circulating cooling water is greatly improved to further ensure the disinfection treatment effect of the circulating cooling water.

In another preferred embodiment of the present invention, through the synergistic cooperation of the scale removal anode and the corrosion and scale inhibition anode, a bactericidal and algae killing substance is generated on the surface of the scale removal anode, and the corrosion and scale inhibition anode releases quantitative metal ions to the circulation under the action of electric current. In water, it achieves the dual effects of slowing down corrosion and preventing the formation of scale.

Description of the drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

Fig. 1 is a schematic diagram of the overall structure of a circulating cooling water treatment equipment provided by a specific embodiment of the present invention.

Among them, 11-shell, 111- water inlet, 112- water outlet, 12- descaling anode, 13- disinfection anode, 131- first water blocking membrane, 132- disinfection gas generation chamber, 14- corrosion and scale inhibition anode , 15-disinfection component, 151-disinfection gas transfer cavity, 152-salt storage cavity, 153-gas port, 154-jet, 161-gas pipe, 162-return pipe, 163-return pump, 164-diversion pipe , 17-spindle, 171-scraper, 172-drive device, 18-sewage pipeline, 181-sewage valve, 19-electric control box.

Detailed ways

The cathode is a cathode common to all electrochemical processes, and the cathode is connected to the negative electrode of the electrolysis power source;

The housing is provided with a descaling anode and a disinfecting anode extending in a vertical direction; the outer periphery of the disinfecting anode is sheathed with a first water blocking membrane, and the inside of the first water blocking membrane is formed with the A disinfection gas generating chamber communicated with the inner cavity of the housing;

A disinfection assembly is provided on the outside of the housing, and a disinfection gas transfer cavity and a salt storage cavity are provided inside the disinfection assembly that can be connected in a disconnected manner; the disinfection gas transfer cavity and the disinfection gas A gas transmission pipe and a return pipe are respectively arranged between the generation rooms; the gas transmission pipe is used to introduce the disinfection gas generated in the disinfection gas generation room into the disinfection gas transfer chamber; the lower part of the disinfection gas transfer chamber is the salt solution temporary A storage room, where the salt solution temporary storage room is in communication with the salt storage cavity; the return pipe is used to introduce the salt solution in the salt solution temporary storage room into the disinfection gas generating cavity;

The bottom of the housing is provided with a rotating shaft extending in the vertical direction of the axis, and a number of scrapers that are appropriately fitted to the inner wall of the housing are arranged on the rotating shaft along the circumferential direction, and the scrapers are arranged along the housing. The radial direction of is located between the inner wall of the casing and each anode, and the bottom of the casing is also provided with a driving device that can drive the rotation shaft to rotate;

In a specific embodiment, the circulating cooling water treatment equipment provided by the present invention includes a housing 11 as a cathode. The lower part of the housing 11 has a water inlet 111 communicating with the upstream circulating water pipeline, and the upper part of the housing 11 has a water inlet 111 communicating with the upstream circulating water pipeline. The water outlet 112 connected to the downstream circulating water pipeline, the housing 11 is provided with a descaling anode 12 and a disinfecting anode 13 extending in the vertical direction of the axis. The outer periphery of the disinfecting anode 13 is sheathed with a first water blocking membrane 131. The inside of a water blocking membrane 131 forms a sterilizing gas generating chamber 132 communicating with the inner cavity of the housing 11; the housing 11 is provided with a sterilizing assembly 15 inside, and the sterilizing assembly 15 is provided with a sterilizing gas relay that can be connected to each other. The cavity 151 and the salt storage cavity 152, the top of the sterilization gas transfer cavity is provided with a gas delivery port; the gas delivery port is connected to the circulating water pipeline through the jet 154; between the sterilization gas transfer cavity 151 and the sterilization gas generation chamber 132 Connected with a gas pipe 161 through which disinfection gas can be introduced from the disinfection gas generating chamber 132 into the disinfection gas transfer chamber 151 and a return pipe 162 through which the salt solution can be introduced into the disinfection gas generating chamber 132 from the disinfection gas transfer chamber 151, and the disinfection gas transfer chamber 151 There is a gas port 153 connected to the circulating water pipeline at the top of the gas transfer chamber; the lower part of the disinfection gas transfer chamber is a salt solution temporary storage chamber, which is in communication with the salt storage chamber; the return pipe is used to connect the temporary storage chamber The salt solution is preferably introduced into the disinfection gas generating chamber through a reflux pump; the bottom of the housing 11 is rotatably provided with a rotating shaft 17 extending in the vertical direction of the axis. The rotating shaft 17 is circumferentially arranged with several housings. A suitable scraper 171 is attached to the inner wall of the casing 11. The scraper 171 is located between the inner wall of the casing 11 and the anodes along the radial direction of the casing 11, and the bottom of the casing 11 is also provided with a driving device 172 capable of driving the rotation shaft 17 to rotate. The bottom of the inner cavity of the housing 11 is connected with a sewage pipe 18, a sewage valve 181 is provided on the sewage pipe 18, and an electric control box 19 is also provided on the outside of the housing 11.

In the present invention, removing hardness and sterilizing are the two most basic functions of the aqueous electrolysis process. The three common problems in circulating water systems are scaling (caused by hardness), corrosion and microorganisms. The corrosion problem is related to the material of the heat exchanger in the circulating water system. Sometimes the corrosion can be controlled within a reasonable range by maintaining proper water quality. In this case, there is no need to slow-release the scale-inhibiting anode 14. For example, in the embodiment, the make-up water is Beijing tap water, the heat exchanger is made of copper, and the pipe is made of carbon steel. As long as the hardness and alkalinity of the circulating water are maintained at an appropriate level, the corrosion rate can be controlled within a prescribed range. Without the use of slow-release electrodes, the problems of sterilization and scaling and slowing down corrosion can also be solved.

However, fouling is related to the temperature on the material side of the heat exchanger. The higher the temperature, the easier fouling is. Therefore, another function of the slow-release electrode is to prevent high-temperature fouling. For example, large-scale air compressors. When the air temperature is high in summer, the compressed air temperature will be higher after compression, sometimes reaching above 80°C. At this time, the water used to cool the compressed air, especially in areas with high hardness, is prone to scaling. , The zinc ion and magnesium ion released by the slow-release electrode can play the role of scale inhibition.

On some occasions, such as when the water quality in the South is relatively soft, system corrosion and microbial growth are the main problems, while hardness is a secondary problem. After ensuring that the corrosion and microorganisms are controlled, a certain degree of hardness can be removed to ensure the stability of the water quality (no scaling, corrosion and microorganisms are controlled within a reasonable range). At this time, the three types of electrode descaling anode, disinfection anode and corrosion inhibitor The scale anode 14 needs to be used at the same time. Because of the low chloride ions in the south, there is no disinfection anode, and the production of sterilizing substances is insufficient, while the southern microorganisms are more likely to breed. Water quality in the south is also corroded, and corrosion inhibition measures should be equipped. If there is less drainage, the fouling substances will accumulate and increase, and the hardness removal must be ensured.

In any case, the use of corrosion and scale inhibition anodes is beneficial to the treatment of circulating cooling water, and it has the effect of corrosion inhibition and scale prevention. After using the corrosion and scale inhibition anodes, the electrolysis current will increase and the hardness removal will increase; The flocculation of ions released by the upper corrosion-inhibiting electrode has a better sterilization effect. From an economic point of view, increasing the electrode and working current will increase the operating cost. Therefore, the three kinds of electrodes are combined according to actual needs, while meeting both technical and economic requirements.

During the working process, the staff controls the various components to work together through the electric control box 19, and cooperates with the scale removal anode 12 and the corrosion and scale inhibition anode 14 to generate sterilization and algae killing substances on the surface of the scale removal anode 12, and at the same time inhibit corrosion and scale. The anode 14 releases a certain amount of metal ions under the action of electric current to the water inside the housing 11 to reach the circulating water system, achieving the dual effect of slowing down corrosion and preventing the formation of scale. At the same time, under the action of electric current, the surface of anode 13 is disinfected and the return pipe 162 The input salt solution contacts and undergoes an oxidation reaction to generate disinfection gas, and the disinfection gas is delivered to the disinfection gas transfer chamber 151 through the gas pipe 161, and then the disinfection gas escapes in the disinfection gas transfer chamber 151 and passes through the gas delivery port 153 It is sent into the circulating water pipeline to disinfect the circulating water. The first water blocking membrane 131 can effectively block the liquid communication between the disinfection gas generating chamber 132 and the circulating water in the inner cavity of the housing 11, and allow anions in the circulating water Pass and enter the disinfection gas generating chamber 132 in order to participate in the relevant electrochemical reaction to ensure the stable and efficient generation of disinfection gas; in addition, after long-term operation of the equipment, the rotating shaft 17 can be driven by the driving device 172 to rotate, thereby driving the scrapers 171 to rotate in conjunction. In order to scrape and clean the scale and impurities attached to the inner wall of the housing 11 as a whole, and regularly open the drain valve 181 so that the scale and the like are discharged through the drain pipe 18. The first water blocking membrane 131 is preferably an ion selective permeation membrane; the water permeability of the ion selective permeation membrane is very low, and only ions pass under the action of an electric field; specifically, the first water blocking membrane 131 You can choose NafionN966 or FlemionF865. The circulating cooling water treatment equipment fully realizes the disinfection, descaling, corrosion and scale inhibition, and anti-sludge deposition of circulating cooling water through the coordination of various anode components, and the treatment efficiency is high. , And the treatment effect is good, can fully ensure the water quality balance and stability of the circulating cooling water, and fully guarantee the stable and continuous operation of the cooling tower, heat exchanger and other related equipment.

It should be noted that, considering the actual treatment effect and the corresponding equipment operating cost, the salt in the salt storage chamber 152 is preferably sodium chloride, and accordingly, the salt solution introduced into the disinfection gas generating chamber 132 is a sodium chloride solution. The disinfection gas generated by the disinfection gas generation chamber 132 is chlorine gas. At the same time, the use of the above-mentioned first water blocking membrane 131 enables the disinfection gas generation chamber 132 to concentrate chlorine ions in the circulating cooling water, and concentrate the concentrated chlorine ions into Chlorine and hypochlorous acid can continuously inhibit the growth of bacteria in the water, and effectively reduce the concentration of chloride ions in the circulating cooling water, and reduce the risk of component corrosion caused by chloride ions; in addition, the electrolysis of the water near the disinfection anode 13 produces oxygen and free oxygen It reacts with water and dissolved oxygen in the water to generate ozone, thereby maintaining the disinfection environment in the chamber.

The chemical reaction at the 13 disinfection anode mentioned above is expressed as follows:

Generate oxygen:

^{_{4HO - → O 2 (g)}} + 2H 2 O + 4e -; free chlorine:

Cl ^{^-} -e ^- → Cl;

Chlorine:

^{_{2Cl - (aq) → Cl 2}} (g) + 2e -;

ozone:

_{^{^{O 2 + 2HO - -2e - →}}} O 3 (g) + H 2 O;

Free radical OH:

OH ^{^-} -e ^- → OH;

hydrogen peroxide:

_{^{2H 2 O-2e - → H}} 2 O 2 + 2H +.

Oxygen free radicals:

_{^{2H 2 O-2e - → O}} + 2H +.

In addition, the casing 11 is used as a cathode, which is shared by all the electrochemical processes corresponding to each anode. Specifically, in practical applications, both the descaling anode 12 and the disinfecting anode 13 are preferably DSA (Dimension Stable Anode, that is, dimensional stable anode). ) Anode, so as to avoid excessive anode loss after long-term operation of the equipment, and reduce equipment use cost. At the same time, corrosion and scale inhibition anode 14 is an aluminum-magnesium-zinc alloy anode to further ensure the effect of slowing corrosion and the corresponding treatment cost, and the reaction process The zinc ion concentration in the liquid is preferably 1.5 ppm to 4 ppm, more preferably 2 to 4 ppm, and usually the LSI (Langelier saturation index, that is, the Langelier saturation index) in the liquid environment should be controlled within 1.5. Obtain the best corrosion inhibition effect and prevent scaling in high temperature areas.

On this basis, in the vicinity of the cathode, aqueous electrolysis OH ^-, obtain a pH of up to 14 strong alkaline solution in the vicinity of the interface layer of the cathode, calcium carbonate and magnesium hydroxide in the interfacial layer is supersaturated, and calcium hydroxide Magnesium crystallizes rapidly on the surface of the cathode and the interface layer, and some scale crystals are deposited and precipitated on the surface of the cathode, so that the subsequent scraper 171 can scrape and clean.

Correspondingly, the electrochemical reaction at the inner wall of the casing 11, namely the cathode, is expressed as follows:

_{2H 2 O (l) + 2e} → H 2 (g) + 2OH - (aq)

Ca ₂ ⁺ (aq) calcium ions may be formed

Calcium hydroxide: Ca(OH) ₂ (scale)

Calcium carbonate: CaCO ₃ (scale).

Furthermore, a jet 154 is provided at the air delivery port 153. During the operation of the equipment, a negative pressure environment is formed when the circulating cooling water flows through the jet 154, so that the disinfection gas in the disinfection gas transfer chamber 151 can be efficiently sucked out and sent into the circulating water pipeline, thereby greatly improving the disinfection gas and circulating cooling water. In order to further ensure the disinfection effect of circulating cooling water.

Specifically, a return pump 163 is provided on the return pipe 162. The reflux pump 163 can further increase the diversion pressure in the reflux pipe 162 and optimize the diversion effect, thereby further increasing the liquid circulation rate and flow rate in the reflux pipe 162 and ensuring the overall operation efficiency of the equipment.

More specifically, downstream of the return pipe 162 is communicated with a diversion pipe 164 inserted in the sterilization gas generating chamber 132. The diversion tube 164 can ensure that the liquid in the return tube 162 can directly pass into the liquid environment in the disinfection gas generating chamber 132, thereby further improving the mixing efficiency of related solutions and ensuring the continuous and efficient implementation of related electrochemical reactions.

On the other hand, a second water blocking membrane is sheathed on the outer periphery of the descaling anode 12, and the inside of the second water blocking membrane is in communication with the inner cavity of the housing 11. The function of the second water-blocking membrane is basically the same as that of the first water-blocking membrane 131. You can directly refer to the relevant description above, and the relative positional relationship between the second water-blocking membrane and the descaling anode 12 is also the same as the above. The relative positional relationship between the first water blocking membrane 131 and the disinfecting anode 13 described in the article is similar. Therefore, although the second water blocking membrane is not shown in the figure, the relative positional relationship between the mating parts can be directly referred to in FIG. 1 The relative positional relationship between the first water blocking membrane 131 and its mating parts will not be repeated here.

In addition, in practical applications, the driving device 172 is a motor to ensure the stable and efficient operation of the rotating shaft 17 and to improve the coordination ability and control effect between the rotating shaft 17 and the electric control box 19.

A part of the circulating cooling water to be treated is passed into the circulating cooling water treatment equipment in the above technical scheme in the form of side flow through the water inlet, and after descaling, generating disinfection substances and sterilization in the shell, it returns to the circulation In the cooling water system, the treated circulating cooling water is obtained.

Both the descaling anode and the disinfecting anode will produce disinfecting substances to disinfect the circulating cooling water. In the present 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 perform the process of releasing corrosion and scale inhibition ions.

From the perspective of descaling, if the hardness of the supplementary water (which can be tap water or river water) is too low, for example, the hardness of the supplementary water is lower than 50mg/L, the descaling function needs to be weakened, the sterilization and algae killing and corrosion inhibition functions need to be strengthened, and the equipment configuration should be made accordingly Adjustment. When the hardness range is 50～180mg/L, there is no need to install a diaphragm outside the descaling anode, and the descaling function can meet the requirements. When the hardness is greater than 180mg/L, the descaling function needs to be strengthened, and the installation of a diaphragm outside the descaling anode can improve the descaling efficiency. Moreover, descaling requires the coordination of _{alkalinity HCO 3} ^- _{. The higher the HCO 3} ^- , the heavier the descaling task, and the equipment configuration should be adjusted accordingly.

The invention adopts the above-mentioned equipment to process circulating cooling water, which is simple and efficient, and can flexibly adjust the water quality problems to be solved according to different supplementary water quality and working conditions. Using this method, the problems of scale removal, sterilization and algae killing, scale inhibition and corrosion inhibition can be solved at the same time.

In order to further illustrate the present invention, the circulating cooling water treatment equipment and the circulating cooling water treatment method provided by the present invention will be described in detail below in conjunction with examples, but they should not be understood as limiting the protection scope of the present invention.

Example 1

Central air-conditioning circulating cooling water system, with a circulating water volume of 850m ³ /h and a system volume of 50m ³ , supplementing municipal tap water. Set up 2 electrochemical side-flow water treatment equipment, each with a processing water volume of 25m ³ /h, and each with a working current of 30A. In the cooling season of 2018, the control of scaling and corrosion problems met the specified requirements, but the microorganisms were difficult to control, and bacteria and algae grew in the water, especially on the outer edge of the cooling tower packing, where moss grew. The water quality analysis data is shown in Table 1. Among them, the cumulative removal rate of calcium hardness is 69% (complementary water calcium hardness * chloride ion concentration ratio-circulating water calcium hardness, the difference is divided by the supplementary water calcium hardness * chloride ion ratio to get the cumulative removal rate). The residual chlorine in the circulating water is generated by the electrochemical bypass water treatment equipment, and the concentration is only 0.01mg/L, which is insufficient for microbial control.

Table 1: Water quality analysis in 2018

In May 2019, the electrochemical sidestream treatment equipment was transformed, and a disinfection gas generation room was installed. The water quality analysis data is shown in Table 2. The cumulative removal rate of calcium hardness reached 81%, an increase of 12%. The residual chlorine concentration in the circulating water was 0.1mg/L, which was 10 times that before the transformation. The microorganisms inside and outside the cooling tower were obtained. Effective control. The chlorine ions in the effluent of the disinfection gas generation chamber are higher than those in the circulating water, and the residual chlorine content reaches 5.2mg/L, indicating that the equipment not only produces residual chlorine after the transformation, 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 in the welding workshop of the automobile factory has a circulating water volume of 1050m ³ /h, a system volume of 500m ³ , and an average evaporation rate of 0.5%, supplementing municipal tap water. Set up 2 sets of electrochemical side-flow water treatment equipment, each with a processing water volume of 20m ³ /h, and each with a working current of 20A. There is no scaling phenomenon in the circulating cooling water system, the microorganisms are within the control range, and the corrosion problem is prominent.

Refer to Table 3 for the quality of replenishing water. The replenishing LSI is negative, and the RSI is greater than 6, which has a strong tendency to corrosive; after being concentrated to 6-8 times, the RSI of the circulating water is still greater than 6, and there is a tendency to corrosion. The carbon steel coupon test also shows that there is corrosion in the circulating water. Since July 3, 2017, each electrochemical device is equipped with 4 descaling electrodes and 2 corrosion and scale inhibition electrodes. The average zinc ion content is 2～4mg/L, the corrosion rate of carbon steel is 0.06mm/a, and the corrosion of copper The speed is 0.004mm/a.

Table 3: Water quality analysis of circulating cooling water in welding workshop of automobile factory

It can be seen from the above embodiments that the circulating cooling water treatment equipment provided by the present invention, during its operation, the staff controls the various components to work together through the electric control box, and under the action of the electric current, the surface of the anode and the salt input from the return pipe are disinfected. The solution contacts and undergoes an oxidation reaction to generate disinfection gas, and the disinfection gas is delivered to the disinfection gas transfer cavity through the gas pipe, and then the disinfection gas escapes from the disinfection gas transfer cavity and is sent into the circulating water pipeline through the gas delivery port for Disinfect the circulating water. The first water-blocking membrane can effectively block the liquid communication between the disinfection gas generating chamber and the circulating water in the inner cavity of the housing, and allow the anions in the circulating water to pass through and enter the disinfection gas generating chamber to participate in related chemistry The reaction ensures the stable and efficient generation of disinfection gas; in addition, after long-term operation of the equipment, the rotating shaft can be driven by the driving device to drive the scrapers to rotate in conjunction, so that the scale and impurities attached to the inner wall of the shell can be scraped and cleaned as a whole. And regularly open the drain valve to allow the above-mentioned scales to be completely discharged through the drain pipeline to ensure that the water environment inside the shell is clean. The circulating cooling water treatment equipment, through the synergistic cooperation of the descaling anode and the disinfecting anode assembly, fully and thoroughly realizes the disinfection, descaling and anti-sludge deposition of the circulating cooling water, and the treatment efficiency is high. And the treatment effect is good, can fully guarantee the water quality balance and stability of the circulating cooling water, and fully guarantee the stable and continuous operation of the cooling tower, heat exchanger and other related equipment.

A jet is arranged at the gas delivery port. During the operation of the equipment, a negative pressure environment is formed when the circulating cooling water flows through the jet, so that the disinfection gas in the disinfection gas transfer chamber can be efficiently sucked out and sent into the circulating water pipeline, thereby greatly improving the relationship between the disinfection gas and the circulating cooling water. Mixing efficiency to further ensure the disinfection effect of circulating cooling water.

The above are only the preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications are also It should be regarded as the protection scope of the present invention.

Claims

A circulating cooling water treatment equipment, characterized in that it comprises a casing as a cathode;

The cathode is a cathode common to all electrochemical processes, and the cathode is connected to the negative electrode of the electrolysis power source;

The lower part of the housing is provided with a water inlet, and the water inlet is in communication with the upstream circulating water pipeline;

The upper part of the casing is provided with a water outlet, and the water outlet is in communication with the downstream circulating water pipeline;

The housing is provided with a descaling anode and a disinfecting anode extending in a vertical direction; the outer periphery of the disinfecting anode is sheathed with a first water blocking membrane, and the inside of the first water blocking membrane forms a disinfection gas generator. room;

A disinfection assembly is provided on the outside of the housing, and a disinfection gas transfer chamber and a salt storage chamber are provided in the disinfection assembly that can be connected in a disconnected manner; The gas transmission pipe and the return pipe are respectively provided; the gas transmission pipe is used to introduce the disinfection gas generated in the disinfection gas generation chamber into the disinfection gas transfer chamber; the lower part of the disinfection gas transfer chamber is the salt solution temporary storage room, and the salt solution temporary storage room Communicate with the salt storage cavity; the return pipe is used to introduce the salt solution in the salt solution temporary storage room into the disinfection gas generating room;

The top of the sterilizing gas transfer cavity is provided with a gas transmission port; the gas transmission port is connected with a circulating water pipeline through a jet;

The bottom of the housing is provided with a rotating shaft extending in the vertical direction of the axis, and a number of scrapers that are appropriately fitted to the inner wall of the housing are arranged on the rotating shaft along the circumferential direction, and the scrapers are arranged along the housing. The radial direction of is located between the inner wall of the casing and each anode, and the bottom of the casing is also provided with a driving device that can drive the rotation shaft to rotate;

The bottom of the inner cavity of the housing is connected with a sewage pipeline, the sewage pipeline is provided with a sewage valve, and an electric control box is also provided outside the housing.
The circulating cooling water treatment equipment according to claim 1, characterized in that a corrosion and scale inhibition anode is further arranged in the interior of the casing along a vertical direction; the corrosion and scale inhibition anode is an aluminum-magnesium-zinc alloy anode.
The circulating cooling water treatment equipment according to claim 1, wherein the return pipe is provided with a return pump.
The circulating cooling water treatment equipment according to claim 1, wherein a second water blocking membrane is sheathed on the outer periphery of the descaling anode; the second water blocking membrane is in communication with the inner cavity of the housing.
The circulating cooling water treatment equipment according to claim 1, wherein a diversion tube is connected downstream of the return pipe; the diversion tube is inserted in the disinfection gas generation chamber.
The circulating cooling water treatment equipment according to claim 1, wherein the descaling anode and the disinfecting anode are both DSA anodes.
The circulating cooling water treatment equipment according to claim 1, wherein the driving device is a motor.
The circulating cooling water treatment equipment according to claim 1, wherein the first water blocking membrane is an ion selective permeation membrane.
A treatment method for circulating cooling water includes the following steps:

A part of the circulating cooling water to be treated is passed into the circulating cooling water treatment equipment according to any one of claims 1 to 8 through the water inlet in the form of side flow, and descaling, generating disinfection substances and sterilization are carried out in the shell Then, return to the circulating cooling water system to obtain the treated circulating cooling water.
The method according to claim 9, characterized in that the release of corrosion and scale inhibition ions is also performed in the shell.