A system and method for simultaneously capturing high-purity calcium carbonate and removing calcium from circulating cooling water

Abstract

The application discloses a system and method for removing calcium from circulating cooling water and synchronously capturing high-purity calcium carbonate, relates to the technical field of circulating cooling water descaling, and comprises a reaction tank, a dosing mechanism arranged on the reaction tank and used for adding reagents to the inside of the reaction tank to generate precipitates, a bottom plate arranged in the inside of the reaction tank, and a rotating mechanism arranged above the bottom plate. 2+ The application can effectively remove hardness ions in the cooling water in a segmented manner of removing Mg 2+ and Ca ; and the crystal seeds are circulated through the CO2 and cooling water mixing area, which can effectively improve the efficiency of heterogeneous nucleation of the crystal seeds, efficiently adsorb CaCO3, and thus improve the descaling efficiency and reduce the operation and maintenance costs.

Description

Technical Field

[0001] This invention relates to the field of descaling technology for circulating cooling water, and more particularly to a system and method for simultaneously removing calcium from circulating cooling water and capturing high-purity calcium carbonate. Background Technology

[0002] Scaling in industrial circulating cooling water systems has long been a key bottleneck restricting energy efficiency improvements. During the circulation process where thermodynamic equilibrium is disrupted, the calcium content in the water... 2+ Mg 2+ Scale-causing ions, under the synergistic effects of temperature gradients, concentration ratios, and pH changes, will precipitate in thermodynamically stable forms such as calcium carbonate and magnesium hydroxide. This dense scale layer formed by inorganic salt deposition not only significantly reduces the heat transfer coefficient but also triggers system-level risks such as a surge in flow resistance and exacerbated localized corrosion.

[0003] The current prevention and control system mainly adopts a dual-track strategy of chemical and physical methods: chemical treatment relies on organophosphonates and polycarboxylic acid scale inhibitors to intervene in lattice distortion. Although it can achieve short-term scale inhibition, it faces constraints such as agent decay, ecotoxicity, and total phosphorus emission limits. Physical treatment technologies (such as high-frequency electromagnetic fields and pulsed ultrasound) regulate the crystallization kinetic path through physical fields, but they have technical bottlenecks such as low energy conversion efficiency and significant treatment blind spots under high flow conditions.

[0004] Currently, novel CO2 acidification control technologies based on green chemistry principles reconstruct the carbonic acid balance system in cooling water by precisely injecting CO2 into it. Then, seed-induced nucleation technology promotes the preferential deposition of hardness ions on the surface of artificial seed crystals, reducing the scaling rate. However, current engineering applications still suffer from low gas-liquid mass transfer efficiency and a single multiphase reaction pathway, resulting in low separation efficiency of hardness ions in cooling water. These ions cannot quickly adhere to the seed crystal surface, and the separated scale is mixed, hindering effective resource utilization. Summary of the Invention

[0005] This invention addresses the aforementioned problems by proposing a system and method for simultaneously removing calcium from circulating cooling water and capturing high-purity calcium carbonate, removing Mg in stages. 2+ and Ca 2+ It also improves the heterogeneous nucleation efficiency of seed crystals and enables efficient adsorption of calcium carbonate.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A system for simultaneously removing calcium from circulating cooling water and capturing high-purity calcium carbonate includes:

[0008] Reaction tank;

[0009] The dosing mechanism, located on the reaction tank, is used to add reagents into the reaction tank to generate precipitate;

[0010] The base plate is located inside the reaction tank;

[0011] A rotating mechanism is located above the base plate;

[0012] The rotating mechanism includes a rotating tube rotatably connected inside the reaction tank. A fixed tube is connected to the rotating tube. A shovel is provided on one side of the fixed tube and a reaction component is provided on the other side. The shovel is hollow inside. One side of the shovel is inclined downward and has a suction port at its lower edge. The suction port is connected to the fixed tube. The lower edge of the shovel can contact the upper surface of the bottom plate to suck up the sediment on the bottom plate through the suction port.

[0013] A seed crystal adding mechanism, which is installed on the reaction tank, is used to add seed crystals into the interior of the reaction tank;

[0014] The reaction assembly includes a guide plate with side plates on both sides. The side plates are hollow inside, and the side of the two side plates that are close to each other has a gas outlet. The gas outlet is connected to a fixed pipe to spray CO2. The rotating pipe rotates so that the spatula picks up the seed crystal and allows the seed crystal to pass between the two side plates.

[0015] Furthermore, a connecting port is provided in the middle of the fixed tube, and a connecting pipe is provided between the connecting port and the rotating tube. One end of the fixed tube is connected to the suction port of the shovel plate, and the other end is connected to the air outlet of the side plate. One-way valves are provided at both ends of the interior of the fixed tube, and the two one-way valves are located on both sides of the connecting port.

[0016] Furthermore, one side of the guide plate is tilted upwards to make the rotating tube rotate, which in turn drives the guide plate to move, causing the seed crystal to tilt and move upwards.

[0017] Furthermore, it also includes a three-way valve and a collection tank. One end of the three-way valve is connected to the rotating pipe with an external connecting pipe, one end is connected to the collection tank with an extraction pipe, and the other end is connected to a vent pipe. The vent pipe is connected to an external CO2 cylinder, and the extraction pipe is equipped with an extraction pump for extracting sediment.

[0018] Furthermore, it also includes a sedimentation tank, with a drainage pipe between the sedimentation tank and the reaction tank, and an aeration disc inside the sedimentation tank.

[0019] Furthermore, the dosing mechanism includes a water level sensor, which is located at the top of the inside of the reaction tank to detect the amount of cooling water inside the water level sensor. The inside of the reaction tank is equipped with a calcium and magnesium ion monitor and a pH monitor.

[0020] Furthermore, the seed crystal addition mechanism includes a box body and a rotating plate. The box body is disposed on the reaction tank, and multiple first dispensing ports are opened at the bottom of the box body. The rotating plate is rotatably connected to the bottom of the box body, and multiple second dispensing ports are provided on the rotating plate. The first dispensing ports and the second dispensing ports are staggered. The rotating plate rotates to align the first dispensing ports with the second dispensing ports.

[0021] The upper surface of the base plate is funnel-shaped, and the lower edge of the shovel plate is inclined and adapted to the upper surface of the base plate. A push rod is provided at the bottom of the base plate to push the base plate up so that the lower edge of the shovel plate can fit against the upper surface of the base plate. It also includes a recycling mechanism, which includes a collection box, a filter box, a rotating disk, and a fixed disk. The filter box is located inside the collection box, and a pressure sensor is provided at the bottom of the filter box. A drain pipe is provided in the middle of the base plate, and the outlet of the drain pipe is located above the filter box. The fixed disk is located at the outlet of the drain pipe, and the rotating disk is located at the bottom of the fixed disk. There is a gap between the rotating disk and the fixed disk. A drive mechanism is provided at the bottom of the rotating disk to drive the rotating disk to rotate.

[0022] In addition, regarding the aforementioned system for simultaneously removing calcium from circulating cooling water and capturing high-purity calcium carbonate, this invention also provides a method for simultaneously removing calcium from circulating cooling water and capturing high-purity calcium carbonate, which uses the aforementioned system for removing calcium from circulating cooling water and capturing high-purity calcium carbonate for descaling, and includes the following steps:

[0023] S1: Inject the cooling water to be treated into the reaction tank, and at the same time add the reagent into the reaction tank through the dosing mechanism to control the pH value of the cooling water. The rotating pipe drives the fixed pipe to rotate and stir the cooling water quickly. The shovel plate makes the cooling water circulate up and down, so that the reagent and cooling water are fully mixed.

[0024] S2: Reduce the rotation speed of the rotating tube, perform slow stirring, the pH value of the cooling water increases, and Mg... 2+ Mg(OH)2 is generated, and Mg(OH)2 becomes flocculent and precipitates on the bottom plate;

[0025] S3: Extract the Mg(OH)2 precipitate from the bottom plate. The Mg(OH)2 precipitate is sucked in through the suction port of the shovel plate, and at the same time, the rotating tube rotates slowly to make the shovel plate sweep across the bottom plate at a uniform speed, so that all the Mg(OH)2 precipitate on the bottom plate is extracted.

[0026] S4: Seed crystals are added to the reaction tank through the seed crystal addition mechanism, and CO2 is discharged through the vent. The discharged CO2 mixes with the cooling water in the reaction tank. Ca... 2+ The crystal reacts with CO32- to obtain CaCO3. Simultaneously, as the rotating tube slowly rotates, the seed crystal is scooped up by the spatula and placed on the guide plate. The seed crystal passes between the side plates, undergoing heterogeneous nucleation and adsorption of CaCO3.

[0027] The beneficial effects of this invention are as follows:

[0028] In this invention, the system for simultaneously removing calcium from circulating cooling water and capturing high-purity calcium carbonate adds reagents to the reaction tank via a dosing mechanism, controlling the pH value of the cooling water to prevent Mg from forming. 2+ The reagent reacts with OH- to form Mg(OH)2 precipitate. At this point, a rotating tube drives a fixed tube to rotate and stir the cooling water, initially quickly then slowly. This ensures thorough mixing of the reagent and cooling water while facilitating the precipitation of flocculent Mg(OH)2 to the bottom plate. The Mg(OH)2 precipitate is then drawn into the suction port of a shovel plate, removing Mg from the cooling water of the reaction tank. 2+ Prioritize removal. Then, seed crystals are added to the inside of the reaction tank, while CO2 is discharged through various vents, mixing with the cooling water in the reaction tank, which allows Ca to... 2+ The crystals react with CO32- to form CaCO3. A rotating tube then drives a fixed tube to rotate slowly, while an inclined shovel scoops up the sunken seed crystals. The seed crystals circulate between the side plates. Since CO2 is released from the vents on the side plates and mixes with the cooling water, the area between the side plates becomes a mixing zone. This effectively enhances the efficiency of heterogeneous nucleation of the seed crystals as they pass through this zone, resulting in effective adsorption of CaCO3. Furthermore, the seed crystals rise in the cooling water via the inclined guide plate, ensuring they remain suspended for an extended period and further enhancing the adsorption effect.

[0029] This system removes Mg in stages. 2+ and Ca 2+ This method effectively removes hardness ions from cooling water and avoids mixing with scale, forming high-purity CaCO3 for easy subsequent resource utilization. Furthermore, the continuous circulation of seed crystals through the CO2 and cooling water mixing zone effectively improves the efficiency of heterogeneous nucleation of seed crystals, enabling efficient adsorption of CaCO3, thereby improving descaling efficiency and reducing operating and maintenance costs. Attached Figure Description

[0030] Figure 1 This is a cross-sectional structural diagram of a circulating cooling water system for simultaneous calcium removal and high-purity calcium carbonate capture, as proposed in this invention.

[0031] Figure 2 This is a schematic diagram of the three-dimensional structure of the reaction tank of a system for simultaneous calcium removal and high-purity calcium carbonate capture using circulating cooling water, as proposed in this invention.

[0032] Figure 3 This is a three-dimensional structural diagram of the base plate and rotating mechanism of a system for simultaneously capturing high-purity calcium carbonate in circulating cooling water, as proposed in this invention.

[0033] Figure 4 This is a three-dimensional structural diagram of the bottom plate and rotating mechanism after the bottom plate is raised in a circulating cooling water system for simultaneous calcium removal and high-purity calcium carbonate capture proposed in this invention.

[0034] Figure 5 This is a side cross-sectional view of the shovel, fixing pipe, and reaction components of a circulating cooling water system for simultaneous calcium removal and high-purity calcium carbonate capture, as proposed in this invention.

[0035] Figure 6 This is a top sectional view of the shovel, fixed pipe, and reaction components of a circulating cooling water system for simultaneous calcium removal and high-purity calcium carbonate capture, as proposed in this invention.

[0036] Figure 7 This is a cross-sectional view of the dosing mechanism of a circulating cooling water system for simultaneous calcium removal and high-purity calcium carbonate capture, as proposed in this invention.

[0037] Figure 8 This is a three-dimensional structural diagram of the seed crystal addition mechanism of a system for simultaneously capturing high-purity calcium carbonate in circulating cooling water for calcium removal, as proposed in this invention.

[0038] Figure 9 This is a cross-sectional view of the recovery mechanism of a system for simultaneously capturing high-purity calcium carbonate in circulating cooling water, as proposed in this invention.

[0039] Figure 10 This is a three-dimensional structural diagram of the fixed disk and rotating disk of a system for simultaneously capturing high-purity calcium carbonate in circulating cooling water, as proposed in this invention.

[0040] In the diagram: 1. Reaction tank; 101. Inlet pipe; 102. Drain pipe; 103. Overflow pipe; 104. Drain pipe; 2. Dosing mechanism; 201. Outer shell; 202. Storage cylinder; 203. Discharge pipe; 204. Sealing cover; 205. Threaded rod; 206. Moving plate; 207. First servo motor; 208. Water level sensor; 3. Seed addition mechanism; 301. Box; 302. Top cover; 303. Rotating plate; 304. Second servo motor; 4. Three-way valve; 401. External connection pipe; 402. Vent pipe; 403. Extraction pipe; 5. Collection... Collection tank, 501 extraction pump, 6 sedimentation tank, 601 aeration disc, 7 bottom plate, 701 push rod, 8 rotating mechanism, 801 rotating pipe, 802 drive motor, 8021 transmission belt, 803 connecting pipe, 804 reaction component, 8041 guide plate, 8042 side plate, 8043 air outlet, 805 fixed pipe, 8051 one-way valve, 806 shovel plate, 8061 baffle, 9 recovery mechanism, 901 collection box, 902 filter box, 903 crushing motor, 904 rotating disc, 905 fixed disc. Detailed Implementation

[0041] The technical solution of this patent will be further described in detail below with reference to specific embodiments.

[0042] The embodiments of this patent are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this patent, and should not be construed as limiting this patent.

[0043] In the description of this patent, it should be understood that the terms “center,” “upper,” “lower,” “front,” “back,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this patent and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this patent.

[0044] In the description of this patent, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection or setting, a detachable connection or setting, or an integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this patent according to the specific circumstances.

[0045] Reference Figure 1-10 A system and method for simultaneously capturing high-purity calcium carbonate in circulating cooling water for calcium removal is proposed to improve the descaling effect of cooling water.

[0046] The system and method for removing calcium from circulating cooling water and simultaneously capturing high-purity calcium carbonate includes a reaction tank 1 and a collection tank 5 and a sedimentation tank 6 connected to the reaction tank 1.

[0047] A water inlet pipe 101 is provided on one side of the reaction tank 1 for injecting cooling water to be treated into the reaction tank 1.

[0048] Reference Figure 7The top of the reaction tank 1 is equipped with a dosing mechanism 2 for adding reagents into the reaction tank 1 and controlling the amount added. The dosing mechanism 2 includes a housing 201, a storage cylinder 202, a dispensing pipe 203, a sealing cap 204, a threaded rod 205, a moving plate 206, and a first servo motor 207. The housing 201 is disposed on the reaction tank 1, and the storage cylinder 202 is disposed inside the housing 201. The housing 201 has an opening communicating with the storage cylinder 202, and a sealing cap 204 is provided at the opening, through which reagents can be added into the storage cylinder 202. The movable plate 206 is slidably connected to the inside of the medicine storage cylinder 202, the threaded rod 205 is rotatably connected to the inside of the medicine storage cylinder 202, and the movable plate 206 has a threaded hole in the middle, the threaded rod 205 is threadedly connected to the movable plate 206 in the threaded hole, the first servo motor 207 is set at the bottom of the medicine storage cylinder 202, and the output shaft of the first servo motor 207 is connected to the threaded rod 205, and the upper end of the medicine outlet pipe 203 is connected to the upper part of the medicine storage cylinder 202.

[0049] The rotation of the first servo motor 207 drives the threaded rod 205 to rotate, thereby causing the moving plate 206 to move upward inside the medicine storage cylinder 202, pushing the medicine in the medicine storage cylinder 202 upward. The medicine is discharged through the medicine outlet pipe 203 and falls into the interior of the reaction tank 1, where it mixes with the cooling water.

[0050] The dosing mechanism 2 also includes a water level sensor 208, which is located at the bottom of the first servo motor 207 and is used to detect the amount of cooling water injected into the reaction tank 1, thereby facilitating the control of the amount of chemicals added.

[0051] Reference Figure 1 The reaction tank 1 is equipped with a bottom plate 7 that can slide up and down. The bottom of the bottom plate 7 is equipped with a push rod 701, which is used to control the bottom plate 7 to move up and down inside the reaction tank 1.

[0052] Reference Figure 1 , Figure 3 and Figure 4 The reaction tank 1 is equipped with a rotating mechanism 8, which includes a rotating tube 801, a drive motor 802, a connecting tube 803, a fixed tube 805, and a shovel plate 806. The rotating tube 801 is rotatably connected to the inside of the reaction tank 1. The drive motor 802 is located at the top of the reaction tank 1 and is connected to the rotating tube 801 for driving the rotating tube 801 to rotate. The fixed tube 805 is located at the bottom of the rotating tube 801 and is connected to the rotating tube 801 through the connecting tube 803. The shovel plate 806 is located on one side of the fixed tube 805. The shovel plate 806 is inclined and hollow, and has a suction port on one side.

[0053] In some embodiments, the upper end of the rotating tube 801 extends to the outside of the reaction tank 1, and pulleys are provided on both the upper end of the rotating tube 801 and the output shaft of the drive motor 802, with a transmission belt sleeved on the outside of the two pulleys. The drive motor 802 can drive the rotating tube 801 to rotate via the transmission belt.

[0054] The upper end of the rotating tube 801 is connected to the collection tank 5, and a pump 501 is provided on one side of the collection tank 5. The pump port of the pump 501 is connected to the upper end of the rotating tube 801.

[0055] After the cooling water to be treated is injected into the reaction tank 1, PAA and Na2CO3 are added through the dosing mechanism 2 to raise the pH to approximately 9.3. The drive motor 802 then rotates the fixed pipe 805 to agitate the cooling water, and the inclined shovel 806 rotates accordingly, thus creating an up-and-down circulation of the cooling water and ensuring thorough mixing of the reagents. During this process, Mg... 2+ Mg(OH)2 is generated, and Mg(OH)2 becomes flocculent, preferentially precipitates, and falls onto the bottom plate 7.

[0056] After Mg(OH)₂ precipitates on the bottom plate 7, the push rod 701 pushes the bottom plate 7 upward, causing the Mg(OH)₂ precipitate on the bottom plate 7 to contact the shovel plate 806. At this time, the extraction pump 501 extracts the Mg(OH)₂ precipitate from the bottom plate 7. The Mg(OH)₂ precipitate is then sucked in through the suction port of the shovel plate 806, and then enters the collection tank 5 through the fixed pipe 805 and the rotating pipe 801 for further precipitation. Meanwhile, the Mg(OH)₂ in the cooling water of the reaction tank 1... 2+ Removed.

[0057] Reference Figure 8 The reaction tank 1 has a seed crystal adding mechanism 3 at its top interior for adding seed crystals, which are made of quartz sand or ceramsite. The seed crystal adding mechanism 3 includes a box 301, a top cover 302, and a rotating plate 303. The box 301 is mounted on the reaction tank 1, with a feeding port at its top and a top cover 302 at the feeding port for adding seed crystals. The bottom of the box 301 has multiple first feeding ports. The rotating plate 303 is rotatably connected to the bottom of the box 301 and has multiple second feeding ports, with the first and second feeding ports staggered. By rotating the rotating plate 303, the positions of the second feeding ports can be changed, aligning the first and second feeding ports. At this time, the seed crystals inside the box 301 can fall into the cooling water inside the reaction tank 1 through the first and second feeding ports.

[0058] The seed crystal adding mechanism 3 also includes a second servo motor 304, which is located on one side of the housing 301. The output shaft of the second servo motor 304 is equipped with a gear, and the outside of the rotating plate 303 is equipped with a gear ring. The gear ring meshes with the gear, so that the rotating plate 303 can be driven to rotate by the second servo motor 304, connecting the first dispensing port and the second dispensing port, thereby facilitating the dispensing of the seed crystal.

[0059] Reference Figure 1 It also includes a three-way valve 4, one end of which is connected to the upper end of the rotating pipe 801 via an external pipe 401, one end of which is connected to the collection tank 5 via an extraction pipe 403, and one end of which is connected to a vent pipe 402, which is connected to an external CO2 cylinder.

[0060] Reference Figure 5 and Figure 6 The rotating mechanism 8 also includes a reaction assembly 804, which includes a guide plate 8041. The guide plate 8041 is located on the side of the fixed tube 805 away from the shovel plate 806, and one end of the guide plate 8041 is inclined upward. Both sides of the guide plate 8041 are provided with side plates 8042. The side plates 8042 are hollow and communicate with the interior of the fixed tube 805. Both sides of the two side plates 8042 that are close to each other are provided with multiple air outlets 8043.

[0061] When adding the seed crystals, rotate the three-way valve 4 to connect the rotating pipe 801 with the vent pipe 402. At this time, the CO2 inside the CO2 cylinder enters the fixed pipe 805 sequentially through the vent pipe 402 and the rotating pipe 801, then enters the side plate 8042 and is discharged through the various vent holes 8043, mixing with the cooling water in the reaction tank 1. While the CO2 and cooling water are mixing, the rotating pipe 801 drives the fixed pipe 805 to rotate slowly. The inclined shovel 806 scoops up the seed crystals that have sunk to the bottom. The seed crystals rise through the inclined shovel 806 and fall onto the inclined guide plate 8041. At this time, the seed crystals pass between the side plates 8042. Because the CO2 and cooling water are mixed at this time, it effectively allows the Ca... 2+ The crystals react with CO32- to form CaCO3, which is then adsorbed through heterogeneous nucleation by seed crystals. Furthermore, the seed crystals rise in the cooling water via an inclined guide plate 8041, ensuring that the seed crystals remain suspended in the cooling water for an extended period, thus enhancing the adsorption effect.

[0062] In some embodiments, the vent 8043 is inclined, with its outlet facing the direction of seed crystal movement. When the seed crystal passes between the two side plates 8042, since the direction of seed crystal movement is consistent with the outlet direction of the vent 8043, it can effectively prevent the seed crystal from entering the vent 8043 and causing blockage.

[0063] In some embodiments, the fixed pipe 805 has a connecting port in the middle, and a connecting pipe 803 is provided between the connecting port and the rotating pipe 801. One end of the fixed pipe 805 is connected to the suction port of the shovel plate 806, and the other end is connected to the air outlet of the side plate 8042. One-way valves 8051 are provided at both ends inside the fixed pipe 805, located on both sides of the connecting port. When extracting Mg(OH)2 precipitate, one of the one-way valves 8051 is open and the other is closed, thus ensuring that the Mg(OH)2 precipitate enters the collection tank 5. When CO2 is introduced into the cooling water, one of the one-way valves 8051 is closed and the other is open, thus ensuring that CO2 enters the interior of the side plate 8042 through the fixed pipe 805, so that the extraction by the shovel plate 806 and the discharge by the side plate 8042 do not affect each other.

[0064] In some embodiments, a baffle 8061 is rotatably connected to the suction inlet of the shovel 806, and a torsion spring is provided at the rotation point of the baffle 8061. When the shovel 806 is not extracting Mg(OH)2 precipitate, the baffle 8061 closes the suction inlet via the torsion spring, preventing cooling water and seed crystals from entering the interior of the shovel 806. When the shovel 806 is extracting Mg(OH)2 precipitate, the negative pressure generated during extraction causes the baffle 8061 to rotate, thereby opening the suction inlet and facilitating the extraction of Mg(OH)2 precipitate into the collection tank 5.

[0065] Reference Figure 1 A drain pipe 104 is provided on one side of the reaction tank 1, and the drain pipe 104 is connected to the sedimentation tank 6. An aeration disc 601 is provided inside the sedimentation tank 6.

[0066] After CaCO3 adsorption, the bottom plate 7 is lowered by push rod 701, allowing the cooling water to undergo initial sedimentation inside the reaction tank 1, with the seed crystals settling on the bottom plate 7. Then, the drain pipe 104 is opened, allowing the upper layer of cooling water to enter the sedimentation tank 6 for secondary sedimentation. CO2 is then added to the sedimentation tank 6 through the aeration disc 601 to change the pH value of the cooling water.

[0067] Reference Figure 1 The upper surface of the base plate 7 is funnel-shaped, and a drain pipe 102 is provided in the middle of the base plate 7. The lower edge of the shovel plate 806 is inclined and adapted to the upper surface of the base plate 7 so that the lower edge of the shovel plate 806 can fit against the upper surface of the base plate 7, thereby extracting the Mg(OH)2 precipitate on the base plate 7. After the cooling water inside the reaction tank 1 is discharged, the funnel-shaped upper surface of the base plate 7 facilitates the accumulation of seed crystals after the adsorption of CaCO3, which are then discharged and collected through the drain pipe 102.

[0068] Reference Figure 1 , 9The system also includes a recycling mechanism 9, which comprises a collection box 901, a filter box 902, a rotating disk 904, and a fixed disk 905. The filter box 902 is located inside the collection box 901, and a pressure sensor is installed at the bottom of the filter box 902 to detect its weight. The outlet of the drain pipe 102 is located above the filter box 902, and a fixed disk 905 is installed at the outlet of the drain pipe 102. The rotating disk 904 is located at the bottom of the fixed disk 905, and a gap is provided between the rotating disk 904 and the fixed disk 905. When the seed crystals are discharged through the drain pipe 102, they enter the gap between the rotating disk 904 and the fixed disk 905. As the rotating disk 904 and the fixed disk 905 rotate relative to each other, the large seed crystals with a large volume due to the adsorption of CaCO3 are crushed, and the smaller seed crystals fall into the filter box 902 through the gap. The pressure sensor weighs the seed crystals.

[0069] The recycling mechanism 9 also includes a crushing motor 903, which is located inside the collection box 901. The output shaft of the crushing motor 903 is fixedly connected to the rotating disk 904 to drive the rotating disk 904 to rotate.

[0070] In some embodiments, the reaction tank 1 is equipped with a calcium and magnesium ion monitor to monitor the calcium and magnesium ion content in the cooling water, so as to control the reagent and CO2 injection rate based on the content. The reaction tank 1 is also equipped with a pH monitor to monitor the pH value of the cooling water.

[0071] In some embodiments, an overflow pipe 103 is provided on one side of the reaction tank 1 and at the top of the sedimentation tank 6 for collecting overflowed CO2.

[0072] In some embodiments, a method for simultaneously removing calcium from circulating cooling water and capturing high-purity calcium carbonate is provided. This method uses the aforementioned system for simultaneously removing calcium from circulating cooling water and capturing high-purity calcium carbonate for descaling, and includes the following steps:

[0073] S1: Cooling water to be treated is injected into the reaction tank 1 through the inlet pipe 101. At the same time, PAA agent is added into the reaction tank 1 through the dosing mechanism 2. The amount of PAA added is controlled according to the amount of cooling water. The PAA concentration is controlled at 5mg / L-10mg / L. At this time, the rotating pipe 801 drives the fixed pipe 805 to rotate and stir rapidly in the cooling water. The inclined shovel plate 806 rotates accordingly, so that the cooling water forms an up-and-down circulation, and the agent and cooling water are fully mixed.

[0074] S2: Subsequently, NaOH is added through the dosing mechanism 2 to adjust the pH of the cooling water to 9.3-9.5. The rotation speed of the rotating tube 801 is reduced, and slow stirring is performed for 10-15 minutes. During this process, Mg... 2+Mg(OH)2 is generated, and Mg(OH)2 becomes flocculent, preferentially precipitates, and falls onto the bottom plate 7.

[0075] S3: After Mg(OH)2 precipitation, the bottom plate 7 is pushed upward by the push rod 701, so that the Mg(OH)2 precipitate on the bottom plate 7 contacts the shovel plate 806. At this time, the three-way valve 4 is rotated to connect the external pipe 401 to the extraction pipe 403, and then the extraction pump 501 extracts the Mg(OH)2 precipitate on the bottom plate 7. The Mg(OH)2 precipitate is sucked in through the suction port of the shovel plate 806. At the same time as the precipitate is sucked in, the rotating pipe 801 rotates slowly, thereby extracting all the Mg(OH)2 precipitate on the bottom plate 7. Then, it enters the collection tank 5 through the rotating pipe 801 and the extraction pipe 403, where the Mg(OH)2 precipitate undergoes further precipitation. At this time, the Mg in the cooling water of the reaction tank 1... 2+ Removed

[0076] S4: Subsequently, ceramsite with a particle size of 50μm-150μm and a dosage of 10mg / L-30mg / L is added to the interior of the reaction tank 1 via the seed crystal adding mechanism 3. This is achieved by rotating the rotating plate 303 via the second servo motor 304, connecting the first and second feeding ports, thus allowing the ceramsite inside the box 301 to fall into the reaction tank 1. During ceramsite addition, the three-way valve 4 is rotated to connect the external connecting pipe 401 to the vent pipe 402. CO2 from inside the CO2 cylinder sequentially enters the fixed pipe 805 through the vent pipe 402 and rotating pipe 801, then enters the side plate 8042, and is discharged through various vent holes 8043, mixing with the cooling water in the reaction tank 1. The CO2 flux is controlled at 0.2Nm³. 3 / (h·m 3 ) to 0.3 Nm 3 / (h·m 3 Maintain the pH of the cooling water at 9.3. The mixing of CO2 and cooling water effectively reduces the calcium content. 2+ It reacts with CO32- to produce CaCO3;

[0077] The rotating tube 801 drives the fixed tube 805 to rotate slowly for 15-30 minutes. The inclined shovel 806 scoops up the settled ceramic particles, which then rise through the shovel and fall onto the inclined guide plate 8041. At this time, the ceramic particles pass between the side plates 8042. Since CO2 is discharged from the vents 8043 on the side plates 8042 and mixes with the cooling water, the area between the side plates 8042 becomes a mixing zone. When the ceramic particles pass between the side plates 8042, the efficiency of heterogeneous nucleation of the seed crystals is effectively improved, and CaCO3 is effectively adsorbed. Furthermore, the ceramic particles rise in the cooling water through the inclined guide plate 8041, ensuring that they remain suspended in the cooling water for a long time, further enhancing the adsorption effect.

[0078] S5: After CaCO3 adsorption, the bottom plate 7 is lowered by push rod 701, allowing the cooling water to undergo initial sedimentation inside the reaction tank 1, with the ceramsite settling to the bottom plate 7. Then, the drain pipe 104 is opened, and the upper layer of cooling water enters the sedimentation tank 6 for secondary sedimentation. CO2 is then added to the sedimentation tank 6 through aeration disc 601 to change the pH value of the cooling water, controlling it to 6.8-7.2.

[0079] S6: After the cooling water is discharged from the reaction tank 1, the ceramic particles that have adsorbed CaCO3 in the reaction tank 1 can be discharged and collected through the drain pipe 102. Since the upper surface of the bottom plate 7 is funnel-shaped, it is convenient for the ceramic particles that have adsorbed CaCO3 to gather and be discharged and collected through the drain pipe 102. When the ceramic particles are discharged through the drain pipe 102, they will enter the gap between the rotating disk 904 and the fixed disk 905. Since the rotating disk 904 and the fixed disk 905 rotate relative to each other, the large ceramic particles that have adsorbed more CaCO3 and have become larger in volume are crushed and crushed. The smaller ceramic particles fall into the filter box 902 through the gap, and the ceramic particles are weighed by the pressure sensor.

[0080] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A system for simultaneously removing calcium from circulating cooling water and capturing high-purity calcium carbonate, characterized in that, include: Reaction tank (1); A dosing mechanism (2) is provided on the reaction tank (1) for adding reagents into the interior of the reaction tank (1) to generate precipitate; The base plate (7) is disposed inside the reaction tank (1); A rotating mechanism (8) is disposed above the base plate (7); The rotating mechanism (8) includes a rotating tube (801) rotatably connected to the inside of the reaction tank (1). A fixed tube (805) is connected to the rotating tube (801). A shovel plate (806) is provided on one side of the fixed tube (805) and a reaction assembly (804) is provided on the other side. The shovel plate (806) is hollow inside. One side of the shovel plate (806) is inclined downward and a suction port is provided on the lower edge. The suction port is connected to the fixed tube (805). The lower edge of the shovel plate (806) is in contact with the upper surface of the bottom plate (7) so as to suck up the sediment on the bottom plate (7) through the suction port. A seed crystal adding mechanism (3) is disposed on the reaction tank (1) and is used to add seed crystals into the interior of the reaction tank (1); The reaction assembly (804) includes a guide plate (8041), and side plates (8042) are provided on both sides of the guide plate (8041). The side plates (8042) are hollow inside, and the side of the two side plates (8042) that are close to each other are provided with vent holes. The vent holes are connected to the fixed tube (805) to spray CO2. The rotating tube (801) rotates so that the shovel plate (806) scoops up the seed crystal and makes the seed crystal pass between the two side plates (8042).

2. The system for simultaneously removing calcium from circulating cooling water and capturing high-purity calcium carbonate according to claim 1, characterized in that: The fixed tube (805) has a connecting port in the middle, and a connecting tube (803) is provided between the connecting port and the rotating tube (801). One end of the fixed tube (805) is connected to the suction port of the shovel plate (806), and the other end is connected to the air outlet of the side plate (8042). Both ends of the fixed tube (805) are provided with one-way valves (8051), and the two one-way valves (8051) are located on both sides of the connecting port.

3. The system for simultaneously removing calcium from circulating cooling water and capturing high-purity calcium carbonate according to claim 1, characterized in that: One side of the guide plate (8041) is tilted upward so that the rotating tube (801) rotates, driving the guide plate (8041) to move so that the seed crystal moves tilted upward.

4. The system for simultaneously removing calcium from circulating cooling water and capturing high-purity calcium carbonate according to claim 1, characterized in that: It also includes a three-way valve (4) and a collection tank (5). One end of the three-way valve (4) is connected to the rotating pipe (801) with an external pipe (401), one end is connected to the collection tank (5) with an extraction pipe (403), and the other end is connected to a vent pipe (402). The vent pipe (402) is connected to an external CO2 cylinder. The extraction pipe (403) is equipped with an extraction pump (501) for extracting sediment.

5. The system for simultaneously removing calcium from circulating cooling water and capturing high-purity calcium carbonate according to claim 1, characterized in that: It also includes a sedimentation tank (6), a drain pipe (104) is provided between the sedimentation tank (6) and the reaction tank (1), and an aeration disc (601) is provided inside the sedimentation tank (6).

6. The system for simultaneously removing calcium from circulating cooling water and capturing high-purity calcium carbonate according to claim 1, characterized in that: The upper surface of the base plate (7) is funnel-shaped, the lower edge of the shovel plate (806) is inclined and adapted to the upper surface of the base plate (7), and a push rod (701) is provided at the bottom of the base plate (7) to push the base plate (7) up so that the lower edge of the shovel plate (806) fits against the upper surface of the base plate (7).

7. The system for simultaneously removing calcium from circulating cooling water and capturing high-purity calcium carbonate according to claim 1, characterized in that: The dosing mechanism (2) includes a water level sensor (208), which is located at the top of the inside of the reaction tank (1) and is used to detect the amount of cooling water inside the reaction tank (1). The inside of the reaction tank (1) is equipped with a calcium and magnesium ion monitor and a pH monitor.

8. The system for simultaneously removing calcium from circulating cooling water and capturing high-purity calcium carbonate according to claim 1, characterized in that: The seed crystal adding mechanism (3) includes a box body (301) and a rotating plate (303). The box body (301) is disposed on the reaction tank (1). The bottom of the box body (301) is provided with a plurality of first dispensing ports. The rotating plate (303) is rotatably connected to the bottom of the box body (301). The rotating plate (303) is provided with a plurality of second dispensing ports. The first dispensing ports and the second dispensing ports are staggered. The rotating plate (303) rotates so that the first dispensing ports and the second dispensing ports are aligned.

9. The system for simultaneously removing calcium from circulating cooling water and capturing high-purity calcium carbonate according to claim 6, characterized in that: It also includes a recycling mechanism (9), which includes a collection box (901), a filter box (902), a rotating disk (904), and a fixed disk (905). The filter box (902) is located inside the collection box (901), and a pressure sensor is provided at the bottom of the filter box (902). A drain pipe (102) is provided in the middle of the base plate (7), and the outlet of the drain pipe (102) is located above the filter box (902). The fixed disk (905) is located at the outlet of the drain pipe (102). The rotating disk (904) is located at the bottom of the fixed disk (905), and there is a gap between the rotating disk (904) and the fixed disk (905). A driving mechanism is provided at the bottom of the rotating disk (904) to drive the rotating disk (904) to rotate.

10. A method for simultaneously removing calcium from circulating cooling water and capturing high-purity calcium carbonate, characterized in that, Descaling using the circulating cooling water system for simultaneous calcium removal and high-purity calcium carbonate capture as described in any one of claims 1-9 includes the following steps: S1: Inject the cooling water to be treated into the reaction tank (1), and at the same time add the agent into the reaction tank (1) through the dosing mechanism (2) to control the pH value of the cooling water. Drive the fixed pipe (805) to rotate and stir the cooling water quickly through the rotating pipe (801). The shovel plate (806) makes the cooling water form an up-and-down circulation, so that the agent and the cooling water are fully mixed. S2: Reduce the rotation speed of the rotating tube (801) and perform slow stirring. The pH value of the cooling water increases, and Mg² + Mg(OH)2 is generated, and Mg(OH)2 becomes flocculent and precipitates on the bottom plate (7); S3: Extract the Mg(OH)2 precipitate on the bottom plate (7). The Mg(OH)2 precipitate is sucked in through the suction port of the shovel plate (806). At the same time, the shovel plate (806) is slowly rotated through the rotating tube (801) so that it sweeps across the bottom plate (7) at a uniform speed, and all the Mg(OH)2 precipitate on the bottom plate (7) is extracted. S4: Seed crystals are added to the interior of the reaction tank (1) through the seed crystal adding mechanism (3), and CO2 is discharged through the vent (8043). When the CO2 is discharged, it mixes with the cooling water in the reaction tank (1), Ca² + With CO3² - The reaction produces CaCO3. Simultaneously, the seed crystal is scooped up by the spatula plate (806) and placed on the guide plate (8041) by the rotating tube (801) rotating slowly. The seed crystal passes between the side plates (8042), and heterogeneous nucleation of the seed crystal occurs, adsorbing CaCO3.

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