Scale inhibition and removal device and method for recirculating cooling water

Abstract

The application discloses a kind of circulating cooling water's scale inhibition and scale removal device's method, including shell, liquid medicine tank, electronic generator, electronic release box, first water pump, second water pump and connecting pipeline;The electronic generator includes shell, low-temperature plasma generating device, passage, positive plate, negative plate, metal sheet, release lead and ground lead;The metal sheet close to positive plate is connected with release lead, and the metal sheet close to negative plate is connected with ground lead;The other end of release lead extends into the inside of electronic release box.The application continuously transports negative electron to circulating water system, and adds auxiliary agent to water body simultaneously;Negative electron and scale-forming ion in water form charged micellar under the adsorption of auxiliary agent, and due to the repulsion between negative electrons, micellar cannot contact and gather, so that scale is not formed in water body.

Description

Technical Field

[0001] This invention relates to the field of water treatment technology, and specifically to a scale inhibition and removal device and method for circulating cooling water. Background Technology

[0002] In industrial circulating cooling water treatment systems, scaling inevitably occurs due to factors such as evaporation and concentration, as well as microbial growth. Scale is a poor conductor of heat; its deposition reduces heat transfer efficiency and can lead to localized corrosion, causing equipment to perforate and fail quickly. Furthermore, scale buildup inside pipes reduces the cross-sectional area of ​​the water flow, increasing flow resistance. Therefore, appropriate water treatment technologies are necessary to treat the water.

[0003] In addition to adding scale inhibitors and corrosion inhibitors, some scale inhibition and removal technologies and equipment have been developed in this field.

[0004] For example, Chinese patent document CN 217265085 U (application number 202221266046.4) discloses a highly efficient scale-inhibiting and bactericidal high-pressure micro-energy generator, including a spiked ion bar, a flow guide tube, and a high-voltage power supply generator. This spiked high-voltage electrostatic field generator, by adding pointed spikes to the traditional ion bar form, utilizes the principle of tip discharge corona to significantly increase the electric field strength of the high-voltage electrostatic field reactor, saving energy consumption. It also ionizes dissolved oxygen in the water to generate superoxide anion free radicals (O2-), which destroy the cell membrane, nucleus, carbohydrates, and proteins of bacteria, altering their living environment, affecting physiological metabolic processes, and ultimately leading to bacterial death, thus improving the scale-inhibiting and bactericidal effect.

[0005] Chinese patent document CN 115745104 A (application number 202211223643.3) discloses a self-scale-inhibiting and self-sterilizing circulating cooling water system, including an electrochemical electrolysis device installed on the pipeline of the circulating water system; the electrochemical electrolysis device is used to convert water containing chloride ions into H+ and oxidizing chloride species at the anode, and then transport the water rich in H+ and oxidizing chloride species to the pipeline, replacing the traditional technical means of adding sulfuric acid, scale inhibitors and bactericides into the circulating water system.

[0006] Chinese patent document CN 212609768 U (application number 202020985854.0) discloses a scale inhibition and removal system for circulating cooling water in a thermal power plant. The system includes an ozone micro-nano bubble generating component and a honeycomb high-voltage electrostatic generator, which are spaced apart in the circulating water tank. The honeycomb high-voltage electrostatic system, which is purely physical, is installed around the water intake pipe in the water intake well as the main scale inhibition and removal equipment. The ozone micro-nano bubble system acts on the front end of the water tank in the water intake well as an auxiliary device. The scale inhibition, removal, sterilization and algae removal functions of the two systems are superimposed to achieve the purpose of scale inhibition, removal, sterilization and algae removal.

[0007] The integrated cooling circulating water treatment system disclosed in Chinese patent document CN 206940660 U (application number 201720375464.X), which combines various technologies, includes a cooling tower, a circulating water tank, a circulating pump, a heat exchanger, a control system, and at least two of the following four devices: an electrochemical descaling device, a cavity electromagnetic device, a high-voltage electrostatic device, and an ultrasonic descaling device. The control system is connected to the electrochemical descaling device, the cavity electromagnetic device, the high-voltage electrostatic device, and the ultrasonic descaling device respectively, and is used to control the working mode of at least two combinations of the electrochemical descaling device, the cavity electromagnetic device, the high-voltage electrostatic device, and the ultrasonic descaling device. By selecting different combination methods, the advantages are complemented to achieve the expected treatment effect; no additional bactericides are needed, as the electrochemical descaling device itself can generate strong oxidizing substances for sterilization; secondary pollution and high chemical costs caused by adding chemical agents are avoided; and the generation of scale and biological sludge in the water is effectively avoided. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to provide a scale inhibition and removal device and method for circulating cooling water with low treatment cost and excellent scale inhibition and removal effect.

[0009] The technical solution for achieving the first objective of this invention is a scale inhibition and descaling device for circulating cooling water, comprising a shell, a chemical tank, an electronic generator, an electronic release box, a first water pump, a second water pump, and connecting pipes; an inlet and a return water interface are provided on one side of the shell; the connecting pipes include a first pipe, a second pipe, and a third pipe; the first pipe connects the inlet and the chemical tank; the second pipe connects the chemical tank and the electronic release box; and the third pipe connects the electronic release box and the return water interface.

[0010] The electron generator includes a housing, a low-temperature plasma generating device, a channel, a positive electrode plate, a negative electrode plate, a metal plate, a release wire, and a grounding wire.

[0011] The plasma outlet of the low-temperature plasma generator is connected to the channel. Positive and negative electrodes are connected to the outer sides of the channel, respectively. Two rows of metal plates are also installed inside the channel, with the two rows of metal plates close to the inner walls on both sides. The metal plate close to the positive electrode is connected to the release wire, and the metal plate close to the negative electrode is connected to the grounding wire. The other end of the release wire extends into the electronic release box.

[0012] Furthermore, a first water pump is installed on the first pipeline, and two first water pumps are installed, one for standby and one for use.

[0013] Furthermore, a second water pump is installed on the third pipeline. Two second water pumps are installed, one for standby and one for use.

[0014] The medicine tank is equipped with a feeding port for adding auxiliary agents.

[0015] An air exchange fan is installed on the housing of the electron generator.

[0016] A pipe is installed between the inner cavity of the electron generator and the inner cavity of the electron release device. The pipe connects the inner cavity of the electron generator and the inner cavity of the electron release device. The interface on the shell of the electron release device that connects to the pipe is located at the top of the electron release device, above the liquid inside. The pipe delivers ozone generated by the low-temperature plasma generator inside the electron generator into the electron release box, which has a sterilization effect.

[0017] The technical solution to achieve the second objective of this invention is a method for inhibiting and removing scale from circulating cooling water using the above-mentioned device. The circulating cooling water system is connected to the inlet interface on the outer shell of the scale inhibition and removal device through an inlet pipe and to the return interface on the outer shell of the scale inhibition and removal device through a return pipe, thus forming a circulation path between the circulating cooling water system and the scale inhibition and removal device. During operation, an auxiliary agent is added to the chemical tank and the electronic generator is turned on.

[0018] The auxiliary agent is fulvic acid, which is added at a ratio of 20g to 50g per ton of water in the circulating cooling water system.

[0019] During operation, the number of electrons per ton of water in the circulating cooling water system shall not be less than 1×10⁻⁶. 7 indivual.

[0020] This invention has positive effects:

[0021] (1) The present invention continuously delivers negative electrons to the circulating water system and adds an auxiliary agent to the water body at the same time; the negative electrons and scale-forming ions (Ca2+, Mg2+, Fe2+, etc.) in the water form charged molecular clusters under the adsorption of the auxiliary agent. Due to the repulsion between negative electrons, the charged molecular clusters cannot contact and aggregate, and the scale-forming ions do not aggregate, so that scale will not form in the water body.

[0022] (2) The system of the present invention also has a descaling effect during operation. The scale in the circulating water system contains impurities such as the corpses of microorganisms and metabolic products, and there are gaps between the scale. The auxiliary agent and negative electrons gradually penetrate into the interior of the scale through the gaps and combine with the scale-forming ions (Ca2+, Mg2+, Fe2+, etc.) inside. Under the action of the repulsive force between electrons, the scale gradually loosens and falls off, thereby achieving the purpose of descaling.

[0023] (3) The pipe installed between the electronic generator and the electronic release box will send the ozone generated by the low-temperature plasma generating device in the electronic generator into the electronic release box, which can kill bacteria and inhibit algae growth; therefore, the system of the present invention has the functions of scale inhibition, scale removal, sterilization and bacteriostasis and algae growth inhibition.

[0024] (4) The additives added to the circulating water system in this invention can significantly prolong the residence time of negative electrons in the water and extend the effectiveness of scale inhibition and removal. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the scale inhibition and removal system of the present invention.

[0026] Figure 2 This is a schematic diagram showing the operating status of the scale inhibition and removal system.

[0027] Figure 3 This is a schematic diagram of the adsorption state of the auxiliary agent macromolecule.

[0028] The markings in the above figures are as follows:

[0029] 1. Outer shell, 1-1 water inlet, 1-2 water return, 2. Liquid tank, 2-1 feeding port, 3. Electronic generator, 3-1 shell, 3-1-1 ventilation fan, 3-2 low-temperature plasma generator, 3-3 channel, 3-4 positive electrode, 3-5 negative electrode, 3-6 metal sheet, 3-7 release wire, 3-8 grounding wire, 3-9 pipe, 4. Electronic release box, 5. First water pump, 6. Second water pump, 7. Connecting pipe, 7-1 first pipe, 7-2 second pipe, 7-3 third pipe, 8. Water inlet pipe, 9. Water return pipe. Detailed Implementation

[0030] (Example 1)

[0031] See Figure 1The scale inhibition and descaling device for circulating cooling water in this embodiment includes a housing 1, a chemical tank 2, an electronic generator 3, an electronic release device 4, a first water pump 5, a second water pump 6, and a connecting pipe 7. The chemical tank 2, electronic generator 3, electronic release device 4, first water pump 5, second water pump 6, and connecting pipe 7 are disposed inside the housing 1. The chemical tank 2, electronic generator 3, electronic release device 4, first water pump 5, and second water pump 6 are connected by the connecting pipe 7.

[0032] A water inlet 1-1 and a water return 1-2 are provided on one side of the outer casing 1.

[0033] The connecting pipe 7 includes a first pipe 7-1, a second pipe 7-2, and a third pipe 7-3.

[0034] The first pipe 7-1 connects the water inlet 1-1 and the medicine tank 2. The first water pump 5 is installed on the first pipe 7-1. Two first water pumps 5 are installed, one for standby and one for use.

[0035] The second pipe 7-2 connects the liquid tank 2 and the electronic release box 4.

[0036] The third pipe 7-3 connects the electronic release device 4 and the return water interface 1-2. A second water pump 6 is installed on the third pipe 7-3. Two second water pumps 6 are installed, one for standby and one for use.

[0037] The medicine tank 2 is provided with a feeding port 2-1 for adding auxiliary agents.

[0038] The electrons collected inside the electron generator 3 are transported to the electron release box 4.

[0039] The electron generator 3 includes a housing 3-1, a low-temperature plasma generating device 3-2, a channel 3-3, a positive electrode 3-4, a negative electrode 3-5, a metal plate 3-6, a release wire 3-7, a grounding wire 3-8, and a pipe 3-9; the low-temperature plasma generating device 3-2, the channel 3-3, the positive electrode 3-4, the negative electrode 3-5, and the metal plate 3-6 are located inside the housing 3-1. A ventilation fan 3-1-1 is installed on the housing 3-1.

[0040] The low-temperature plasma generator 3-2 generates plasma. In this embodiment, the low-temperature plasma generator 3-2 is the AIPS-DBD50T35W low-temperature plasma generator from Zhengdao New Energy Technology Co., Ltd., with a rated power of 35W and an input voltage of 24-31V.

[0041] The low-temperature plasma generator 3-2 consists of a ring-shaped high-voltage aurora blocking negative electrode and a cylindrical proton positive electrode. A high-voltage DC current excites a beam of light-speed electrons (i.e., aurora plasma) between the two electrodes, which breaks down and disperses the passing air. Water molecules in the air are also bombarded by the high-energy, light-speed electron beam as they pass through the high-density plasma field. Under the combined effect of the high-density, light-speed electrons and the high-intensity field pressure, a large number of charged ions and ozone are generated.

[0042] One side of the low-temperature plasma generator 3-2 is the air inlet, and the other side is the plasma outlet. Channel 3-3 is connected to the plasma outlet of the low-temperature plasma generator 3-2, and in the figure, it is connected to the left side of the low-temperature plasma generator 3-2. Channel 3-3 is made of conductive material.

[0043] The positive electrode 3-4 and the negative electrode 3-5 are connected to the outer sides of channel 3-3, respectively. In this embodiment, the negative electrode 3-5 is connected to the upper part of channel 3-3 and the negative electrode 3-5 is connected to the lower part of channel 3-3.

[0044] The interior of channel 3-3 is also equipped with two rows of metal plates 3-6, one above the other. The upper row of metal plates 3-6 is close to the upper inner wall of channel 3-3, and the lower row of metal plates 3-6 is close to the lower inner wall of channel 3-3.

[0045] For the upper row of metal plates 3-6, all metal plates are connected to the grounding wire 3-8 respectively, and the other end of the grounding wire 3-8 is grounded.

[0046] For the lower row of metal plates 3-6, all metal plates are connected to the release wires 3-7 respectively, and the other end of the release wires 3-7 extends into the electronic release box 4.

[0047] That is, the metal piece 3-6 near the positive electrode 3-4 is connected to the release wire 3-7, and the metal piece 3-6 near the negative electrode 3-5 is connected to the grounding wire 3-8.

[0048] Pipe 3-9 connects the inner cavity of the electronic generator 3 and the inner cavity of the electronic releaser 4. The interface on the housing of the electronic releaser 4 that connects to pipe 3-9 is located at the upper part of the electronic releaser 4, above the liquid inside the electronic releaser 4.

[0049] The pipe installed between the electron generator 3 and the electron release box 4 will send the ozone generated by the low-temperature plasma generating device 3-2 in the electron generator 3 into the electron release box 4, which can kill bacteria and inhibit algae growth; therefore, the system of the present invention has the functions of scale inhibition, scale removal, sterilization and bacteriostasis and algae growth inhibition.

[0050] See Figure 2When the above-mentioned device is used for scale inhibition and descaling of circulating cooling water, a circulation path is formed with the water pool below the cooling tower through the inlet pipe 8 and the return pipe 9. One end of the inlet pipe 8 is connected to the water pool, and the other end is connected to the inlet interface 1-1 of the scale inhibition and descaling device; one end of the return pipe 9 is connected to the return interface 1-2 of the scale inhibition and descaling device, and the other end of the return pipe is connected to the water pool.

[0051] When the device is running, the auxiliary agent is added to the chemical tank 2 in advance according to the volume of the cooling tower, and the electronic generator 3 is turned on.

[0052] When the device is running, the first water pump 5 draws water from the pool below the cooling tower into the liquid tank 2 through the inlet pipe 8 and the first pipe 7-1 inside the device. The second water pump 6 draws water from the liquid tank 2 into the electronic release box 4, and then returns it to the pool through the third pipe 7-3 and the return pipe 9.

[0053] When adding the auxiliary agent to the chemical tank 2, add it at a ratio of 20g to 50g per ton of water in the cooling tower; in addition, the release wire 3-7 of the electron generator 3 releases electrons into the water in the electron release box 4 to ensure that the number of electrons per ton of water in the cooling tower is not less than 1×10⁻⁶. 7 indivual.

[0054] After the circulating water flows through the scale inhibitor and descaling device, the water returning to the cooling tower contains negative electrons and auxiliary agents.

[0055] The auxiliary agent is fulvic acid, which adsorbs scale-forming ions and negative electrons (such as...) in the water. Figure 3 As shown in the figure (represented by e-), after adsorbing electrons, they form charged molecular clusters. Due to the repulsion between negative charges, the molecular clusters cannot come into contact with each other and cannot aggregate. As a result, scale-forming ions cannot aggregate, and scale will not form in the water.

[0056] In addition, for existing scale, the scale contains impurities such as the corpses of microorganisms and metabolic products, and there are gaps between the scale particles. The auxiliary agent and electrons gradually penetrate into the interior of the scale through the gaps and combine with the scale-forming ions (Ca2+, Mg2+, Fe2+, etc.) inside. Under the action of the repulsive force between negative charges, the scale gradually loosens and falls off, thereby achieving the purpose of descaling.

[0057] (Application Example 1)

[0058] Water was taken from a thermal power plant and, after 30 days of operation in the cooling tower, the water quality and heat exchanger conditions of the experimental group and each control group were tested.

[0059] The experiment was divided into four groups, including experimental group 1 and three control groups, namely control group 2, control group 3 and control group 4.

[0060] The water tank below the cooling tower in Experimental Group 1 was connected to the scale inhibition and removal device for the circulating cooling water in Example 1. The agent was added and the electron generator 3 was turned on. The agent was added at a ratio of 35g per ton of water in the cooling tower. The release wires 3-7 of the electron generator 3 released electrons into the water in the electron release box 4, ensuring that each ton of water in the cooling tower contained at least 1×10⁻⁶ electrons. 7 indivual.

[0061] Control group 2 received no medication and did not release negative electrons; the operation lasted for 30 days.

[0062] Control group 3 received no chemicals. Electron generator 3's release wires 3-7 released electrons into the water in electron release box 4, ensuring that each ton of water in the cooling tower contained no less than 1 × 10⁻⁶ electrons. 7 indivual.

[0063] The control group 4, when given the drug, did not release negative electrons.

[0064] The above-mentioned agent is fulvic acid.

[0065] The water quality and heat exchanger conditions of each group after 30 days of operation are as follows:

[0066]

[0067] The experimental results show that although negative electrons were introduced into control group 3, they disappeared quickly after entering the water, thus having virtually no effect on scale inhibition and corrosion repair. Similarly, the addition of chemicals to control group 4 also resulted in a weak scale inhibition and corrosion repair effect. However, in experimental group 1, where both chemicals were added and negative electrons were introduced, a significant scale inhibition and corrosion repair effect was observed.

Claims

1. A scale inhibition and removal device for circulating cooling water, characterized in that: It includes a housing (1), a liquid medicine tank (2), an electronic generator (3), an electronic release box (4), a first water pump (5), a second water pump (6), and a connecting pipe (7); a water inlet (1-1) and a water return (1-2) are provided on one side of the housing (1); the connecting pipe (7) includes a first pipe (7-1), a second pipe (7-2), and a third pipe (7-3); the first pipe (7-1) connects the water inlet (1-1) and the liquid medicine tank (2); the second pipe (7-2) connects the liquid medicine tank (2) and the electronic release box (4); the third pipe (7-3) connects the electronic release box (4) and the water return (1-2); The electron generator (3) includes a housing (3-1), a low-temperature plasma generating device (3-2), a channel (3-3), a positive electrode (3-4), a negative electrode (3-5), a metal sheet (3-6), a release wire (3-7), and a grounding wire (3-8). The plasma outlet of the low-temperature plasma generator (3-2) is connected to the channel (3-3). The positive electrode (3-4) and the negative electrode (3-5) are connected to the outer sides of the channel (3-3) respectively. Two rows of metal plates (3-6) are also arranged inside the channel (3-3). The two rows of metal plates (3-6) are close to the inner walls on both sides respectively. The metal plate (3-6) close to the positive electrode (3-4) is connected to the release wire (3-7), and the metal plate (3-6) close to the negative electrode (3-5) is connected to the grounding wire (3-8). The other end of the release wire (3-7) extends into the electronic release box (4). A pipe (3-9) is also provided between the inner cavity of the electronic generator (3) and the inner cavity of the electronic release box (4). The pipe (3-9) connects the inner cavity of the electronic generator (3) and the inner cavity of the electronic release box (4). The interface on the shell of the electronic release box (4) that connects to the pipe (3-9) is located at the upper part of the electronic release box (4) and above the liquid inside the electronic release box (4).

2. The scale inhibition and removal device for circulating cooling water according to claim 1, characterized in that: The first water pump (5) is installed on the first pipeline (7-1). Two first water pumps (5) are installed, one for standby and one for use.

3. The scale inhibition and removal device for circulating cooling water according to claim 1, characterized in that: A second water pump (6) is installed on the third pipeline (7-3). Two second water pumps (6) are installed, one for standby and one for use.

4. The scale inhibition and removal device for circulating cooling water according to claim 1, characterized in that: The medicine tank (2) is provided with a feeding port (2-1) for adding auxiliary agents.

5. The scale inhibition and removal device for circulating cooling water according to claim 1, characterized in that: An air exchange fan (3-1-1) is installed on the housing (3-1) of the electronic generator (3).

6. A method for inhibiting and removing scale from circulating cooling water using the apparatus of claim 1, characterized in that: The circulating cooling water system is connected to the inlet interface (1-1) on the shell (1) of the scale inhibitor and descaling device through the inlet pipe (8), and to the return interface (1-2) on the shell (1) of the scale inhibitor and descaling device through the return pipe (9). The circulating cooling water system and the scale inhibitor and descaling device form a circulation path. During operation, auxiliary agent is added to the chemical tank (2), and the electronic generator (3) is turned on.

7. The method for inhibiting and removing scale from circulating cooling water according to claim 6, characterized in that: The auxiliary agent is fulvic acid, which should be added at a ratio of 20g to 50g per ton of water in the circulating cooling water system.

8. The method for inhibiting and removing scale from circulating cooling water according to claim 7, characterized in that: In a circulating cooling water system, each ton of water contains no less than 1×10 electrons. 7 indivual.

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