Pipeline scale removal device

Abstract

The present invention provides a pipeline scale removal device, comprising: a plurality of descaling disc groups connected in series, wherein each descaling disc group includes multiple descaling discs, each of which has a curved surface on one side and a flat surface on the other. The thickness of the curved surface of the descaling disc gradually decreases from the center to the edge. All descaling discs in each descaling disc group are arranged in series in the same direction and on the same axis, with intervals, so that the curved surfaces are all on the side facing the ore slurry. Furthermore, the outer diameters of all descaling discs gradually decrease along the direction of ore slurry transport. The device advances by relying on the thrust of the ore slurry itself, requiring no additional power, and can easily overcome obstacles, preventing clogging of the pipeline scale removal device. The scale layer is gradually removed from the inner layer to the outer layer with equal thickness, ensuring smooth cleaning. Reserved gaps provide multiple flow channels for the removed dirt, ensuring smooth cleaning.

Description

Technical Field

[0001] The invention belongs to the technical field of pipeline transportation in a mineral processing plant, and in particular relates to a pipeline scale removal device. Background Art

[0002] Currently, some mineral processing plants, such as those in Western Australia and along the Pacific coast of South America, are located near coastal areas with little rainfall year-round. These plants traditionally use desalinated water for processing, which is very costly and significantly reduces overall mine efficiency. Therefore, some plants, such as Shougang's Peruvian iron ore processing plant, have successfully adopted direct seawater processing. However, due to the high concentration of potassium, sodium, and chloride ions in seawater, long-term use can lead to the formation of thick scale layers within the processing plant pipelines, reducing transport capacity and increasing energy consumption. Furthermore, to reduce the transportation costs of concentrate or tailings products, some mines use more cost-effective long-distance pipelines. To ensure the longevity of these long-distance pipelines, lime milk is artificially added to the slurry to form a calcium carbonate scale layer inside the pipelines, protecting the pipe walls from wear.

[0003] Whether it is the scale layer formed by seawater or the scale layer formed by calcium carbonate in the pipeline, when the thickness of the scale layer reaches a certain thickness, it needs to be cleaned to prevent the scale layer from continuing to thicken, causing the inner diameter of the pipeline to gradually decrease, and the internal pressure to gradually increase, causing the pipeline to be blocked or burst.

[0004] Currently, there are two main methods for cleaning scale in pipelines. One involves adding strong acid to the pipes, which reacts with the scale layer. However, this method requires very strict conditions for the use of strong acid, making it difficult to meet environmental requirements. Excessive acid use can also cause corrosion to the pipes. Another method involves manual cleaning, which involves tapping the pipe's exterior or removing sections of the pipe to scrape the inside. These manual methods are laborious and difficult to guarantee effective descaling.

[0005] Therefore, it is necessary to develop a scale removal device for mineral processing plant pipelines with simple structure, easy use and good scale removal effect. Summary of the Invention

[0006] In order to solve the above problems, the present invention provides a pipeline scale removal device, comprising:

[0007] Multiple descaling disc groups are connected in series, wherein each descaling disc group includes multiple descaling discs, one side of each descaling disc is an arc-shaped surface, and the other side is a flat surface. The thickness of the arc-shaped surface of the descaling disc gradually decreases from the center to the edge. All the descaling discs of each descaling disc group are arranged in series in the same direction and coaxially, so that the arc-shaped surfaces are on the side facing the slurry.

[0008] Moreover, the outer diameters of all the descaling discs decrease gradually along the slurry conveying direction.

[0009] Preferably, the outer diameters of all the descaling discs decrease gradually and uniformly from 98% of the inner diameter of the pipeline to 90% of the inner diameter of the pipeline along the slurry conveying direction.

[0010] Preferably, the edge of each descaling disc is evenly distributed with notches at equal angles, which is the same as the total number of descaling discs. Moreover, the notches of all series-connected descaling discs are staggered at equal angles in the same direction, with the stagger angle A being 360° / the number of descaling discs.

[0011] Preferably, a scale layer monitoring mechanism is also included, which includes a flow meter and a pressure gauge arranged at the end of the pipeline along the direction of slurry transportation, and the pressure gauge is connected to a high-pressure alarm, the trigger limit of the high-pressure alarm is set to 120% of the pressure value at the calibrated flow rate, and the high-pressure alarm is connected to the pipeline's feed pump, so that the feed pump stops when the high-pressure alarm is sounded.

[0012] Preferably, the descaling discs of each descaling disc group are coaxially connected to the outside of a hollow sleeve at intervals, the hollow sleeves of each descaling disc group are connected in series to the same series rod, and each hollow sleeve is connected to the flange on the series rod through a flange.

[0013] Preferably, a radar locator is further provided between each descaling disc group of the series rod.

[0014] Preferably, each of the descaling discs is made of polyurethane.

[0015] Preferably, the descaling disc gradually changes from a thickness of 3 cm to 4 cm in the center to a thickness of 1 cm to 2 cm at the edge.

[0016] Preferably, the width and depth of each notch are both 2 cm to 4 cm.

[0017] Preferably, the descaling disc groups are 2 groups, with 3 to 4 descaling discs forming one group.

[0018] The present invention has the following beneficial effects:

[0019] (1) The scale layer monitoring mechanism of the present invention automatically detects and triggers the shutdown of the feed pump, which has a high degree of automation and effectively prevents the continuous thickening of the scale layer in the pipeline, which leads to pipeline blockage and even the risk of pipe burst due to increased pressure.

[0020] (2) The pipeline scale removal device of the present invention moves in the pipeline conveying direction under the push of the slurry and starts the scale removal work. In this way, the pipeline scale removal device moves by relying on the thrust of the slurry itself and does not require additional power to operate efficiently.

[0021] (3) The descaling disc of the present invention is made of polyurethane material, which has a certain degree of flexibility and wear resistance. This material not only ensures that the descaling disc will not be worn and guarantees the life of the descaling disc. In addition, combined with the structural characteristics of the thick center and thin edge arc surface facing the slurry side, the descaling disc can naturally bend when encountering a hard scale layer, thereby crossing the obstacle, while it does not bend when encountering a softer scale layer. This can achieve descaling under low and medium resistance, and can also achieve bending under high resistance to keep the device moving forward, preventing clogging of the pipeline scale removal device.

[0022] (4) The outer diameter of the scale removal disk of the pipeline scale layer removal device of the present invention gradually decreases along the direction of slurry transportation, so that the scale layer is gradually removed from the inner layer to the outer layer with equal thickness. This avoids the situation where, when the diameters are the same, the first scale removal disk assumes the main cleaning function, the subsequent scale removal disks have little cleaning function, and the first scale removal disk is easily blocked, thereby ensuring smooth cleaning.

[0023] (5) The notches of all the descaling discs of the present invention are staggered in the same direction and at equal angles. This structure ensures that the entire scale layer is removed without dead angles on a 360-degree circumference. In addition, this structure leaves several flow channels for the removed dirt through the reserved notches, thereby ensuring that the pipeline scale layer removal device is not blocked by the cleaned dirt and ensuring smooth cleaning work.

[0024] (6) The pipeline scale removal device of the present invention is provided with a radar locator in the middle of the series rod, and the real-time position of the pipeline scale removal device can be displayed on the control screen, thereby realizing the detection of its position, so that the position of the pipeline scale removal device when it is blocked can be known, so as to implement the pipeline scale removal device removal work.

[0025] (7) The minimum turning radius of the conveying pipeline of the present invention is 30 times the length of the series rods, which ensures that the pipeline scale removal device will not be stuck at the pipeline bend and ensures the smooth movement of the pipeline scale removal device.

[0026] (8) The pipeline scale removal device of the present invention relies on the thrust of the slurry itself to eventually be discharged from the end of the pipeline, and the pipeline scale removal device can be recovered simply and quickly. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The above features and technical advantages of the present invention will become clearer and easier to understand by describing its embodiments in conjunction with the following drawings.

[0028] Figure 1 1 is a schematic structural diagram of a pipeline scale removal device according to an embodiment of the present invention;

[0029] Figure 2 yes Figure 1 AA section view. DETAILED DESCRIPTION

[0030] The following describes embodiments of the pipeline scale removal device according to the present invention with reference to the accompanying drawings. Those skilled in the art will recognize that the described embodiments may be modified in various ways or combinations thereof without departing from the spirit and scope of the present invention. Therefore, the drawings and description are illustrative in nature and are not intended to limit the scope of the claims. Furthermore, throughout this specification, the drawings are not drawn to scale, and like reference numerals represent like parts.

[0031] The pipeline scale removal device of this embodiment includes a plurality of scale removal discs connected in series, and is used to remove the scale in the pipeline 1. Figure 1 As shown, each descaling disc assembly includes multiple descaling discs 4. Each descaling disc 4 has a curved surface 41 on one side and a flat surface 42 on the other side. The thickness of the curved surface 41 of each descaling disc 4 gradually decreases from the center to the edge. All descaling discs 4 in each descaling disc assembly are arranged in series in the same direction and coaxially, with the curved surfaces 41 facing the slurry. For example, the descaling discs 4 in each descaling disc assembly are spaced and coaxially sleeved on the outside of a hollow sleeve 8. The hollow sleeves 8 of each descaling disc assembly are connected in series to the same series rod 5, and each hollow sleeve 8 is connected to the flange 9 on the series rod via a flange 9. Figure 1 In the figure, there are two descaling disc assemblies, and two hollow sleeves 8 are sleeved on the same series rod 5. Two flanges 9 are provided on the series rod 5 between the two descaling disc assemblies. Each hollow sleeve 8 is also connected to a flange 9. The flanges 9 of the hollow sleeves are connected to the flanges 9 on the series rod 5 by bolts, thereby fixing the descaling disc assemblies to the series rod 5. Of course, this embodiment does not exclude the descaling disc assemblies from being connected to the series rod 5 by other means, such as welding or bonding.

[0032] Furthermore, the outer diameters of all the descaling discs 4 decrease gradually along the slurry conveying direction. Figure 1 The slurry conveying direction shown is from left to right, so the outer diameter of the descaling disc 4 gradually decreases from left to right. Of course, the gradient can also be unequal, which is not limited here.

[0033] Furthermore, the outer diameters of all the descaling discs 4 gradually decrease from 98% of the inner diameter of the pipeline 1 to 90% of the inner diameter of the pipeline 1 along the slurry conveying direction.

[0034] Furthermore, if Figure 2As shown, the edge of each descaling tray 4 is uniformly distributed with notches 7 at the same angle as the total number of descaling trays. Moreover, the notches of all series-connected descaling trays are staggered at the same angle in the same direction. For example, they are staggered at the same angle in a clockwise direction. The notches 7 of the first descaling tray 4 are staggered at an angle A with the notches 7 of the second descaling tray 4 in the clockwise direction. The notches 7 of the second descaling tray 4 are also staggered at an angle A with the notches 7 of the third descaling tray 4 in the clockwise direction. This continues until the last descaling tray 4. Stagger angle A = 360 / number of descaling trays. For example, Figure 1 There are eight descaling discs, each with eight notches 7. These eight notches 7 are evenly spaced along the circumference of each descaling disc 4. Furthermore, the notches 7 of all serially connected descaling discs 4 are staggered at 45° in a counterclockwise direction. Furthermore, the shape of the notches is not limited in this embodiment; the cross-section of the notches can be any closed curve, such as a rectangle, trapezoid, triangle, circle, or ellipse.

[0035] In an optional embodiment, a scale layer monitoring mechanism is further included. The scale layer monitoring mechanism includes a flow meter 2 and a pressure gauge 3, which are installed at the end of the pipeline along the direction of slurry transportation. The pressure gauge is connected to a high-pressure alarm. The trigger limit of the high-pressure alarm is set to 120% of the pressure value at the calibrated flow rate. When the pressure in the pipeline rises to 120% of the pressure value at the calibrated flow rate, the alarm is triggered. The high-pressure alarm is connected to the pipeline's feed pump, so that the feed pump stops when a high-pressure alarm is triggered.

[0036] By detecting the flow meter 2 and adjusting the speed of the feed pump, the slurry can be transported at the calibrated flow rate, and then the pressure in the pipeline can be monitored by the pressure gauge. If the high-pressure alarm is triggered, it means that the effective inner diameter of the pipeline is reduced and the scaling is serious, which will trigger the shutdown of the feed pump.

[0037] In an optional embodiment, a radar locator 6 is installed between each descaling disc group in the series rod. Its positioning signal is connected to the control room, and its position information can be displayed on the control screen. This radar locator can constantly monitor the position of the descaling disc in the pipeline, especially the location of the cleaning device when it is blocked, so as to facilitate the removal of the cleaning device.

[0038] In an optional embodiment, each descaling disc 4 is made of polyurethane, which has a certain degree of flexibility and wear resistance. This not only ensures that the descaling disc will not be worn and guarantees the life of the descaling disc, but also because the curved surface 41 is on the side facing the slurry, the curved surface 41 has a certain ability to prevent the edge of the descaling disc 4 from bending and deforming. When the descaling disc encounters a hard scale layer, it can naturally bend to overcome the obstacle, while it does not bend when encountering a softer scale layer. This allows descaling under low and medium resistance conditions, and can also bend under high resistance to keep the device moving forward, preventing clogging of the pipeline scale removal device.

[0039] When the descaling disc encounters a hard scale layer, it can bend naturally to overcome the obstacle and prevent the pipeline scale removal device from being blocked.

[0040] In an optional embodiment, the descaling disc 4 gradually changes from a thickness of 3 cm to 4 cm in the center to a thickness of 1 cm to 2 cm at the edge.

[0041] In an optional embodiment, the width and depth of each notch 7 are both 2 cm to 4 cm.

[0042] In an optional embodiment, the descaling disc group is 2 groups, with 3 to 4 descaling discs 4 forming one group.

[0043] In an optional embodiment, the minimum turning radius of the pipeline is 30 times the length of the series rods.

[0044] In an optional embodiment, a plurality of scraping blades (not shown) perpendicular to the plane of the descaling disc or at a certain angle to the plane may be further provided on the edge of one side of the plane of each descaling disc 4. The plurality of scraping blades are evenly distributed along the circumferential direction. When the descaling disc 4 contacts the scale layer on the inner wall of the pipe, the scraping blades can cut into the scale layer and scrape the scale layer into multiple small blocks, which makes it easier for the descaling disc 4 to remove the scale layer.

[0045] Furthermore, the scraping edges of all the serially connected descaling discs are arranged in the same direction and staggered at equal angles, so that the scale layer can be cut in sequence by the scraping edges on the multiple descaling discs 4 at different positions, and the scale layer can be cut into smaller blocks.

[0046] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. Pipeline scale removal device, characterized in that: include: Multiple descaling disc groups are connected in series, wherein each descaling disc group includes multiple descaling discs, one side of each descaling disc is an arc-shaped surface, and the other side is a flat surface. The thickness of the arc-shaped surface of the descaling disc gradually decreases from the center to the edge. All the descaling discs of each descaling disc group are arranged in series in the same direction and coaxially, so that the arc-shaped surfaces are on the side facing the slurry. Moreover, the outer diameters of all descaling discs decrease gradually along the slurry conveying direction. A plurality of scraping edges are provided on the edge of one plane side of each descaling disc.

2. The pipeline scale removal device according to claim 1, characterized in that: The outer diameters of all descaling discs decrease gradually from 98% of the inner diameter of the pipeline to 90% of the inner diameter of the pipeline along the slurry conveying direction.

3. The pipeline scale removal device according to claim 1, characterized in that: The edge of each descaling disc is evenly distributed with notches at equal angles, which is the same as the total number of descaling discs. Moreover, the notches of all series-connected descaling discs are staggered at equal angles in the same direction, with the staggered angle A being 360 / the number of descaling discs.

4. The pipeline scale removal device according to claim 1, characterized in that: It also includes a scale layer monitoring mechanism, which includes a flow meter and a pressure gauge arranged at the end of the pipeline along the direction of slurry transportation, and the pressure gauge is connected to a high-pressure alarm. The trigger limit of the high-pressure alarm is set to 120% of the pressure value under the calibrated flow rate, and the high-pressure alarm is connected to the pipeline's feed pump, so that the feed pump stops when a high-pressure alarm is triggered.

5. The pipeline scale removal device according to claim 1, characterized in that: The descaling discs of each descaling disc group are coaxially connected to the outside of a hollow sleeve at intervals. The hollow sleeves of each descaling disc group are connected in series to the same series rod, and each hollow sleeve is connected to the flange on the series rod through a flange.

6. The pipeline scale removal device according to claim 5, characterized in that: A radar locator is also provided between each descaling disc group of the series rod.

7. The pipeline scale removal device according to claim 1, characterized in that: Each descaling disc is made of polyurethane.

8. The pipeline scale removal device according to claim 1, characterized in that: The descaling disc gradually changes from a thickness of 3cm to 4cm in the center to a thickness of 1cm to 2cm at the edge.

9. The pipeline scale removal device according to claim 3, characterized in that The width and depth of each notch are both 2cm to 4cm.

10. The pipeline scale removal device according to claim 1, characterized in that: The descaling disc group consists of 2 groups, with 3 to 4 descaling discs forming one group.

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