Scale cleaning and sterilizing device for circulating water

Abstract

A circulating water scale cleaning and sterilizing device comprises a cooling tower, a cooling water pond and a heat exchanger, and industrial circulating water in the cooling water pond passes through a circulating cooling water pump, then is cooled by the heat exchanger and the cooling tower in sequence and flows back into the cooling water pond; the cooling water tank is connected with the bypass flow circulating pump through a pipeline, the bypass flow circulating pump pumps industrial circulating water in the cooling water tank, sends the industrial circulating water to the scale removal sterilizer for treatment and then sends the industrial circulating water to the cooling water tank, the scale removal sterilizer comprises an electrolytic tank and an external power supply, and an anode and a cathode in the electrolytic tank are electrically connected with an anode and a cathode of the external power supply respectively; a pollution discharge assembly is mounted on the electrolytic tank; and an online residual chlorine monitor is mounted on an outlet pipeline of the circulating cooling water pump. The industrial circulating water cooling and sterilizing device is used for cooling and sterilizing industrial circulating water, the scaling risk is reduced, and the water supplementing amount is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of industrial water cooling, in particular to a circulating water descaling and sterilizing device. Background Art

[0002] Industrial circulating water treatment mainly includes the following aspects: cooling treatment. The industrial circulating water system drives water to flow in the system through a cooling water pump, absorbs heat from the production process, and then transfers the heat to the external environment through the cooling equipment to achieve cooling and regeneration of the water. Then, the water enters the production equipment again for cooling, forming a cycle; water quality treatment. Industrial circulating water treatment also involves water purification, which includes the use of chemicals such as scale inhibitors and corrosion inhibitors to control the formation of scale, protect metal equipment from corrosion, and use bactericides to control the growth of microorganisms. For example, by adjusting the pH value of water, adding electrolytes and other means, the electrochemical properties of water can be changed, affecting the living environment of microorganisms, thereby achieving the purpose of sterilization; scale prevention and descaling, by reducing the degree of polymerization of water molecules, improving water affinity and scale dissolving ability, it is difficult for water to form scale on the pipe wall; anti-corrosion, forming an oxide film on the pipe wall to prevent water erosion or chemical reaction to corrode the pipe wall, and suppress the corrosiveness of microorganisms; sterilization and algae removal, by changing the electric field strength, affecting the living environment of bacteria and algae, causing them to die; in summary, industrial circulating water treatment not only involves water cooling circulation, but also includes water purification, scale prevention, corrosion prevention and sterilization and other aspects to ensure efficient and safe use of industrial water.

[0003] The principles of circulating water treatment involve many aspects, including physical, chemical and biological treatment methods. The following are several main circulating water treatment principles: physical treatment methods, which mainly remove impurities in water through physical processes, such as removing coarse particles and suspended matter through structures such as grilles, grit chambers and primary sedimentation tanks, and also include purification through filters and activated carbon; chemical treatment methods, which involve the use of chemical agents such as ozone, disinfectants, etc. to kill bacteria and algae, and can also carry out denitrification, dephosphorization and other treatments; biological treatment methods, which use the physiological effects of microorganisms to decompose and synthesize to remove organic matter and nutrients in water, which includes culturing microorganisms in bioreactors to consume organic matter in water; but they cannot be widely adapted, and the antiseptic and bactericidal effects need to be further improved.

[0004] In particular, the circulating cooling water systems in the coking or chemical industries are generally open, with high alkalinity and hardness of the replenishing water, and direct contact with the air, which leads to the growth of bacteria and algae in the circulating water. These bacteria and algae multiply rapidly, and the metabolic secretions and death will form a large number of corpses to form biological slime, which will seriously affect the operation of the system; the circulating water is constantly concentrated, resulting in increased concentrations of calcium and magnesium ions, making the circulating water easy to scale. If scaling occurs at the water use point, it will greatly affect the heat exchange efficiency of the heat exchange equipment, and will seriously affect the operation and service life of the circulating water related equipment. Utility Model Content

[0005] The purpose of the utility model is to provide a circulating water descaling and sterilizing device, which can effectively solve the technical problems mentioned in the background technology.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A circulating water descaling and sterilizing device comprises a cooling tower, a cooling water pool and a heat exchanger. The industrial circulating water in the cooling water pool passes through a circulating cooling water pump, is cooled by the heat exchanger and the cooling tower in sequence, and flows back into the cooling water pool.

[0008] The cooling water pool is connected to a bypass circulation pump through a pipeline, and the bypass circulation pump extracts industrial circulating water in the cooling water pool and sends it to a descaling sterilizer for treatment before sending it to the cooling water pool. The descaling sterilizer includes an electrolytic cell and an external power supply. The anode and cathode in the electrolytic cell are electrically connected to the positive and negative electrodes of the external power supply, respectively, and a sewage discharge assembly is installed on the electrolytic cell;

[0009] An online residual chlorine monitor is installed on the outlet pipe of the circulating cooling water pump, and the online residual chlorine monitor is used to detect the residual chlorine concentration in the industrial circulating water in the cooling water pool. The cooling water pool is provided with a first feed port, and a first feed pipe is installed on the first feed port. An electric regulating valve is installed on the first feed pipe, and one end of the first feed pipe is set as a feed inlet for an oxidizing disinfectant. When the online residual chlorine monitor detects the residual chlorine concentration of the industrial circulating water in the cooling water pool, the detection signal is transmitted to the electric regulating valve, and the increase or decrease of the oxidizing disinfectant supply is controlled by the electric regulating valve.

[0010] Preferably, an online iron ion detector is provided on the outlet pipe of the heat exchanger, and the online iron ion detector is used to detect the concentration of iron in the industrial circulating water.

[0011] Preferably, a second feed port is provided on the cooling water pool, a second feed pipe is installed on the second feed port, an adjustable variable frequency metering pump is installed on the second feed pipe and one end is set as a feed inlet for the corrosion inhibitor. When the online iron ion detector detects the iron concentration of the industrial circulating water, the detection signal is transmitted to the adjustable variable frequency metering pump, and the increase or decrease of the corrosion inhibitor supply is controlled by the adjustable variable frequency metering pump.

[0012] Preferably, the sewage discharge assembly comprises a sewage discharge pump and a sewage discharge pipe, and the sewage discharge pump discharges the scaling formed in the electrolytic cell through the sewage discharge pipe.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] When the circulating cooling water pump is working, the industrial circulating water in the cooling water pool is cooled by the heat exchanger and cooling tower in turn and then flows back into the cooling water pool. At the same time, the bypass circulating pump extracts the industrial circulating water in the cooling water pool and sends it to the descaling sterilizer for treatment before sending it to the cooling water pool. An electrochemical oxidation-reduction reaction occurs in the electrolytic cell of the descaling sterilizer, and a large number of anions are generated near the cathode to combine with calcium ions and magnesium ions to produce scaling substances such as calcium carbonate or calcium hydroxide, magnesium hydroxide, etc., which directly precipitate the scale and discharge it as sludge, thereby reducing scaling, reducing water replenishment, increasing the concentration multiple, and saving water. A large number of strong oxidizing substances are generated near the anode, which can have a very good sterilization effect on bacteria and algae in the industrial circulating water, replacing or reducing the use of traditional bactericides, and playing a role in saving agents.

[0015] In addition, the online residual chlorine monitor in the utility model is used to detect the residual chlorine concentration in the industrial circulating water to ensure that the residual chlorine concentration in the industrial circulating water is 0.1-0.5 mg / l. If the residual chlorine concentration is less than 0.1 mg / l, the supply of oxidizing bactericide is increased through the electric regulating valve. If the residual chlorine concentration is greater than 0.5 mg / l, the supply of oxidizing bactericide is reduced through the electric regulating valve.

[0016] The corrosion control in industrial circulating water adopts the method of installing an online iron ion detector on the outlet pipe of the heat exchanger. When the online iron ion detector measures that the total iron content in the water is greater than 1.0 mg / l, the dosage of the corrosion inhibitor is increased by increasing the flow rate of the adjustable frequency metering pump. The utility model forms a complementary effect by adding chemical treatment, so that the anti-corrosion and sterilization effects are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a circulating water descaling and sterilizing device in an embodiment of the utility model;

[0018] In the figure, 1. cooling tower, 2. cooling water pool, 3. heat exchanger, 4. circulating cooling water pump, 5. side stream circulating pump, 6. descaling sterilizer, 7. online residual chlorine monitor, 8. electric regulating valve, 9. online iron ion detector, 10. adjustable variable frequency metering pump. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] See also Figure 1 As shown, a circulating water descaling and sterilizing device comprises a cooling tower 1, a cooling water pool 2 and a heat exchanger 3. The industrial circulating water in the cooling water pool 2 passes through a circulating cooling water pump 4, is cooled by the heat exchanger 3 and the cooling tower 1 in sequence, and flows back into the cooling water pool 2;

[0021] The cooling water pool 2 is connected to a bypass circulation pump 5 through a pipeline, and the bypass circulation pump 5 extracts industrial circulating water in the cooling water pool 2 and sends it to a descaling and sterilizing device 6 for treatment before sending it to the cooling water pool 2. The descaling and sterilizing device 6 includes an electrolytic cell and an external power supply. The anode and cathode in the electrolytic cell are electrically connected to the positive and negative electrodes of the external power supply, respectively, and a sewage discharge assembly is installed on the electrolytic cell;

[0022] An online residual chlorine monitor 7 is installed on the outlet pipe of the circulating cooling water pump 4, and the online residual chlorine monitor 7 is used to detect the residual chlorine concentration in the industrial circulating water in the cooling water pool 2. The cooling water pool 2 is provided with a first feed port, and a first feed pipe is installed on the first feed port. An electric regulating valve 8 is installed on the first feed pipe, and one end of the first feed pipe is set as a feed inlet of an oxidizing bactericide. When the online residual chlorine monitor 7 detects the residual chlorine concentration of the industrial circulating water in the cooling water pool 2, the detection signal is transmitted to the electric regulating valve 8, and the increase or decrease of the oxidizing bactericide supply is controlled by the electric regulating valve 8;

[0023] An online iron ion detector 9 is provided on the outlet pipe of the heat exchanger 3, and the online iron ion detector 9 is used to detect the iron concentration in the industrial circulating water;

[0024] The cooling water pool 2 is provided with a second feed port, the second feed port is provided with a second feed pipe, the second feed pipe is provided with an adjustable variable frequency metering pump 10 and one end of the second feed pipe is provided with a feed inlet of the corrosion inhibitor, when the online iron ion detector 9 detects the iron concentration of the industrial circulating water, the detection signal is transmitted to the adjustable variable frequency metering pump 10, and the increase or decrease of the supply of the corrosion inhibitor is controlled by the adjustable variable frequency metering pump 10;

[0025] The sewage discharge assembly includes a sewage discharge pump and a sewage discharge pipeline, and the sewage discharge pump discharges the scale formed in the electrolytic cell through the sewage discharge pipeline;

[0026] The redox reaction that occurs near the cathode of the electrolytic cell is:

[0027] 2H2O+2e - = H2+OH -

[0028] CO2+OH - =HCO3 -

[0029] HCO3 - +OH - =CO3 2- +H2O

[0030] Ca2+ and Mg2+ can combine with a large number of anions produced near the cathode to produce scaling products such as calcium carbonate or calcium hydroxide, magnesium hydroxide, etc., which can directly precipitate scale and be discharged from the descaling sterilizer as sludge, reducing the risk of scaling, reducing water replenishment, increasing the concentration multiple, and saving water and chemicals.

[0031] The redox reaction that occurs near the anode of the electrolytic cell:

[0032] 4OH - =O2+2H2O+4e -

[0033] Cl - -e - =Cl 0

[0034] 2Cl - =Cl2+2e -

[0035] O2+2HO - -2e - =O3+H2O

[0036] A large amount of strong oxidizing substances are generated near the anode, which can have a very good sterilizing effect on bacteria and algae in the circulating water, replacing or reducing the use of traditional bactericides, saving reagents, and generating a large amount of active oxidizing substances such as OH on the surface of the anode. - , O 2- , Cl - and O3, H2O2, Cl2, HClO - , and other substances for sterilization and algae removal;

[0037] The following chemical reactions occur at the interface between the inner wall of the pipe and the water:

[0038] Fe 2+ +2OH - →Fe(OH)2

[0039] 2Fe(OH)2+H2O+1 / 2O2→2Fe(OH)3

[0040] 2Fe(OH)3→3H2O+Fe2O3

[0041] 3Fe2O3•nH2O+2e→2Fe3O4+1 / 2O2+3nH2O

[0042] Under the action of the electric field, the reaction will continue to form a dense layer of ferroferric oxide, which will prevent further corrosion and play an anti-corrosion role.

[0043] When the circulating cooling water pump 4 is working, the industrial circulating water in the cooling water pool 2 is cooled by the heat exchanger 3 and the cooling tower 1 in turn and then flows back into the cooling water pool 2. At the same time, the bypass circulating pump 5 extracts the industrial circulating water in the cooling water pool 2 and sends it to the descaling sterilizer 6 for treatment before sending it to the cooling water pool 2. An electrochemical redox reaction occurs in the electrolytic cell of the descaling sterilizer 6, and a large number of anions are generated near the cathode to combine with calcium ions to produce scaling substances such as calcium carbonate or calcium hydroxide, and the scale is directly precipitated and discharged as sludge, thereby reducing scaling, reducing water replenishment, increasing the concentration multiple, and saving water. A large number of active oxidizing substances such as residual chlorine are generated near the anode, which can have a very good sterilization effect on bacteria and algae in the industrial circulating water, replacing or reducing the use of traditional bactericides, and playing a role in saving agents.

[0044] In addition, the online residual chlorine monitor 7 in the utility model is used to detect the residual chlorine concentration in the industrial circulating water to ensure that the residual chlorine concentration in the industrial circulating water is 0.1-0.5 mg / l. If the residual chlorine concentration is less than 0.1 mg / l, the supply of oxidizing bactericide is increased through the electric regulating valve 8. If the residual chlorine concentration is greater than 0.5 mg / l, the supply of oxidizing bactericide is reduced through the electric regulating valve 8.

[0045] The corrosion control in the industrial circulating water adopts the method of installing an online iron ion detector 9 on the outlet pipe of the heat exchanger. When the online iron ion detector 9 measures that the total iron content in the industrial circulating water is greater than 1.0 mg / l, the dosage of the corrosion inhibitor is increased by increasing the flow rate of the adjustable frequency metering pump 10. The utility model forms a complementary effect by adding chemical treatment, so that the anti-corrosion and sterilization effects are improved.

[0046] The above contents are merely examples and explanations of the structure of the present utility model. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the present utility model or exceed the scope defined in the claims, they should all fall within the protection scope of the present utility model.

Claims

1. A circulating water descaling and sterilizing device, characterized in that: It includes a cooling tower, a cooling water pool and a heat exchanger. The industrial circulating water in the cooling water pool passes through a circulating cooling water pump, is cooled by the heat exchanger and the cooling tower in sequence, and flows back into the cooling water pool. The cooling water pool is connected to a bypass circulation pump through a pipeline, and the bypass circulation pump extracts industrial circulating water in the cooling water pool and sends it to a descaling sterilizer for treatment before sending it to the cooling water pool. The descaling sterilizer includes an electrolytic cell and an external power supply. The anode and cathode in the electrolytic cell are electrically connected to the positive and negative electrodes of the external power supply, respectively, and a sewage discharge assembly is installed on the electrolytic cell; An online residual chlorine monitor is installed on the outlet pipe of the circulating cooling water pump, and the online residual chlorine monitor is used to detect the residual chlorine concentration in the industrial circulating water in the cooling water pool. The cooling water pool is provided with a first feed port, and a first feed pipe is installed on the first feed port. An electric regulating valve is installed on the first feed pipe, and one end of the first feed pipe is set as a feed inlet for an oxidizing disinfectant. When the online residual chlorine monitor detects the residual chlorine concentration of the industrial circulating water in the cooling water pool, the detection signal is transmitted to the electric regulating valve, and the increase or decrease of the oxidizing disinfectant supply is controlled by the electric regulating valve.

2. A circulating water descaling and sterilizing device according to claim 1, characterized in that: An online iron ion detector is arranged on the outlet pipe of the heat exchanger, and the online iron ion detector is used to detect the concentration of iron in industrial circulating water.

3. A circulating water descaling and sterilizing device according to claim 2, characterized in that: The cooling water pool is provided with a second feed port, a second feed pipe is installed on the second feed port, an adjustable variable frequency metering pump is installed on the second feed pipe and one end is set as a feed inlet of the corrosion inhibitor. When the online iron ion detector detects the iron concentration of the industrial circulating water, the detection signal is transmitted to the adjustable variable frequency metering pump, and the increase or decrease of the corrosion inhibitor supply is controlled by the adjustable variable frequency metering pump.

4. A circulating water descaling and sterilizing device according to claim 1, characterized in that: The sewage discharge component includes a sewage discharge pump and a sewage discharge pipeline, and the sewage discharge pump discharges the scale formed in the electrolytic cell through the sewage discharge pipeline.

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