High-chlorine coal washing heavy medium cyclone

Abstract

The present application relates to high-chlorine coal washing technology field, a kind of high-chlorine coal washing and heavy medium cyclone is provided, with feed inlet, underflow port and overflow port, feed inlet is used to pass into high-chlorine coal and heavy medium, and heavy medium includes calcium hydroxide, cyclone includes: the hollow inside of refined coal baffle shell, it is arranged in cyclone interior, located at underflow port, the upper end surface of refined coal baffle shell has recess one;Cover lifting is arranged in recess one, cover has a plurality of through holes one on it, through hole one is configured to block heavy object and pass refined coal particles, cover sidewall also has a plurality of through holes two, through hole two is configured to allow heavy object to enter but not to pass through. Through the above technical scheme, the problem that the processing efficiency is not high and part of refined coal particles is mixed with heavy object and taken out underflow port, causing waste, is solved in the prior art that high-chlorine coal is gradually selected and dechlorinated.

Description

Technical Field

[0001] This invention relates to the field of high-chlorine coal washing technology, specifically to a heavy medium cyclone separator for high-chlorine coal washing. Background Technology

[0002] High-chlorine coal requires dechlorination before use. Current technology typically involves a process of coal preparation followed by dechlorination, meaning coal is prepared first and then dechlorinated. Coal preparation usually employs a heavy medium hydrocyclone, a device that uses centrifugal force for separation, primarily used for separating minerals such as coal. The operation of a heavy medium hydrocyclone is based on the principle of centrifugal sedimentation. When the mixture of slurry and heavy media (such as a suspension prepared from magnetite powder) enters the hydrocyclone tangentially under a certain pressure, a high-speed rotating flow field is formed inside the hydrocyclone. In this rotating flow field, the material particles are subjected to various forces, including centrifugal force, gravity, and fluid resistance. The fluid movement inside the hydrocyclone can be divided into external and internal swirling flows. Heavy materials, including middlings and gangue, follow the external swirling flow and are discharged from the bottom outlet. Low-density clean coal particles, under the influence of smaller centrifugal force and the internal swirling flow, are discharged from the overflow outlet of the main hydrocyclone.

[0003] Because the pre-selection and post-removal processes for high-chlorine coal are separate, the on-site processing efficiency is not very high. Furthermore, existing heavy medium cyclones still retain a small amount of low-density clean coal particles that are carried out of the underflow outlet by heavy materials, resulting in unnecessary waste. Therefore, improvements to the existing heavy medium cyclones are needed to address these issues. Summary of the Invention

[0004] This invention proposes a heavy medium cyclone separator for washing high-chlorinated coal, which solves the problems in related technologies where the gradual coal preparation and dechlorination of high-chlorinated coal leads to low processing efficiency and waste caused by some clean coal particles being carried out of the underflow outlet by heavy objects.

[0005] The technical solution of the present invention is as follows: A heavy medium hydrocyclone for washing high-chlorine coal has an inlet, an underflow outlet, and an overflow outlet. The inlet is used to introduce high-chlorine coal and a heavy medium, the heavy medium including calcium hydroxide. The hydrocyclone includes: The clean coal baffle shell is hollow inside and is set inside the hydrocyclone at the underflow port. The upper end face of the clean coal baffle shell has a groove. A baffle is raised and lowered within the groove. The baffle has several through holes 1, which are configured to block heavy objects while allowing fine coal particles to pass through. The side wall of the fine coal baffle shell also has several through holes 2, which are configured to allow heavy objects to enter the through holes 2 but not pass through them.

[0006] As a further technical solution, it also includes: A rotating component is rotatably disposed inside the clean coal baffle shell, located below the baffle cover. The rotating component has a first protrusion, and the baffle cover has a second protrusion. After the rotating component rotates, the second protrusion pushes against the first protrusion, causing the baffle cover to reciprocate up and down. One elastic element acts on the bottom of the groove and on the cover at one end, providing a force for the cover to return to its original position after being raised or lowered.

[0007] As a further technical solution, it also includes: A rotating shaft is rotatably disposed inside the clean coal baffle shell, and the rotation direction of the rotating shaft is the same as the rotation direction of the rotating component; The connector has one end mounted on the rotating part and the other end mounted on the rotating shaft.

[0008] As a further technical solution, it also includes: A flow guide is located below the underflow port and has a flow guiding surface. The clean coal baffle is disposed on the flow guide, and the rotating shaft is rotatably disposed on the flow guide.

[0009] As a further technical solution, it also includes: A pre-screening cover is provided at the overflow port. The pre-screening cover has several through holes three, which are configured to block heavy objects and allow clean coal particles to pass through. A plurality of ejector pins are provided on the pre-screening cover, and at least one ejector pin extends outward from the inside of each of the three through holes.

[0010] As a further technical solution, the amount of calcium hydroxide added is 1.5% of the mass of high-chlorine coal, the feed pressure is 0.08MPa, the feed flow rate is 4L / min, the overflow port diameter is 28mm, and the underflow port diameter is 20mm.

[0011] As a further technical solution, it also includes: Helical blades are mounted on the rotating shaft; A paddle is oscillating on the spiral blade, and its oscillation direction is parallel to the rotation direction of the shaft. After the paddle oscillates, it is used to insert into or extend out of the through hole two to push out the stuck weight. A fixing post is provided on the spiral blade; The second elastic element has one end acting on the fixed post and the other end acting on the lever, and is used to provide the force for the lever to extend into the second through hole.

[0012] As a further technical solution, the inner diameter of the second through hole gradually narrows from the outside to the inside.

[0013] As a further technical solution, the top surface of the cover is a conical surface.

[0014] As a further technical solution, the rotating component is annular and hollow inside.

[0015] As a further technical solution, the top end of the rotating shaft has a spherical guide surface.

[0016] The working principle and beneficial effects of this invention are as follows: In this invention, a hollow clean coal baffle shell is set at the bottom outlet. A baffle is raised and lowered in the groove on the upper end face. The through hole one on the baffle is precisely designed to effectively block heavy objects. Therefore, when a heavy object falls on the baffle, the reciprocating raising and lowering of the baffle is similar to a vibration, pushing the heavy object away and shaking off the attached clean coal particles. The clean coal particles can flow upward with the internal swirling flow. The through hole two on the side wall of the baffle allows heavy objects to enter, but restricts them from passing through the through hole two into the clean coal baffle shell. This allows the clean coal particles attached to the heavy object to be scraped off when it hits the through hole two, and the clean coal particles can pass through the through hole two into the clean coal baffle shell and rise upward under the action of the internal swirling flow. Since the through hole one allows clean coal particles to pass through, the clean coal particles can pass through the through hole one and reach the overflow outlet.

[0017] In summary, the addition of calcium hydroxide to the heavy medium enabled the dechlorination of high-chlorine coal, thus improving coal quality. The design of the clean coal baffle and cover initially prevented the entrainment of heavy objects on clean coal particles at the underflow outlet, improving the clean coal recovery rate and reducing clean coal loss. Attached Figure Description

[0018] The preferred embodiments will now be described in a clear and easy-to-understand manner, in conjunction with the accompanying drawings, to further explain the above-mentioned characteristics, technical features, advantages, and implementation methods of the present invention.

[0019] Figure 1 This is a schematic diagram of the three-dimensional structure of the hydrocyclone in this invention; Figure 2 This is a schematic diagram of the internal structure of the hydrocyclone in this invention; Figure 3 for Figure 2 A magnified schematic diagram of the central part of the structure; Figure 4 for Figure 2 A magnified schematic diagram of the B section in the middle; Figure 5 This is a schematic diagram of the structure of the clean coal baffle shell and the flow guide in this invention; Figure 6 This is a schematic diagram of the clean coal retaining shell structure in this invention; Figure 7 This is a schematic diagram of the structure of the cover and the elastic element in this invention; Figure 8 This is a schematic diagram of the rotating component, rotating shaft, and helical blade structure in this invention; Figure 9 for Figure 8 Another perspective structural diagram; Figure 10 for Figure 9 A magnified schematic diagram of a portion of the C-shaped structure. In the diagram: 1. Feed inlet, 2. Bottom outlet, 3. Overflow outlet, 4. Hydrocyclone, 5. Clean coal baffle shell, 6. Groove 1, 7. Baffle cover, 8. Through hole 1, 9. Through hole 2, 10. Rotating component, 11. Protrusion 1, 12. Protrusion 2, 13. Elastic component 1, 14. Rotating shaft, 15. Connecting component, 16. Guide component, 17. Guide surface, 18. Pre-screen cover, 19. Through hole 3, 20. Pin, 21. Spiral blade, 22. Paddle, 23. Fixed column, 24. Elastic component 2, 25. Guide surface. Detailed Implementation

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0021] To keep the drawings concise, each drawing only schematically shows the parts relevant to the invention; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0022] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0023] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0024] like Figures 1-10As shown, a heavy medium cyclone for washing high-chlorine coal is proposed, having an inlet 1, an underflow inlet 2, and an overflow inlet 3. The inlet 1 is used to introduce high-chlorine coal and a heavy medium, including calcium hydroxide. The cyclone 4 includes: a clean coal baffle shell 5, which is hollow inside and located inside the cyclone 4 at the underflow inlet 2. The upper end face of the clean coal baffle shell 5 has a groove 6. A baffle 7 is raised and lowered and installed in the groove 6. The baffle 7 has several through holes 8, which are configured to block heavy objects while allowing clean coal particles to pass through. The side wall of the clean coal baffle shell 5 also has several through holes 9, which are configured to allow heavy objects to enter through holes 9 but not pass through them.

[0025] In this embodiment, in order to solve the problem of low processing efficiency caused by the gradual coal preparation and dechlorination of high-chlorine coal in related technologies, the hydrocyclone 4 is improved by adding calcium hydroxide to the heavy medium. Calcium hydroxide can react with chlorides in the coal, and then the generated chlorine-containing compounds are removed through subsequent separation processes.

[0026] For example, a heavy medium containing a weighting agent, a liquid medium, and calcium hydroxide added at 1.5% of the coal sample mass is fed into a heavy medium hydrocyclone 4 through inlet 1 along with high-chlorinated coal. The high-chlorinated coal and the heavy medium rotate at high speed within the hydrocyclone 4. Due to the presence of calcium hydroxide, during the washing process, the calcium hydroxide reacts chemically with the chlorine in the high-chlorinated coal to produce soluble substances such as calcium chloride, which are discharged with the liquid, thus achieving dechlorination of the high-chlorinated coal. Experimental tests have shown that, with proper control of the amount of calcium hydroxide added, the chlorine content in the coal can be reduced by approximately 30%-50%, significantly reducing the chlorine content in high-chlorinated coal.

[0027] In addition, the chlorine-containing compounds generated in the reaction can be discharged from hydrocyclone 4 along with the liquid portion. Since they are relatively stable in chemical properties and have a certain degree of solubility in water, they can be effectively removed from the system using conventional water treatment technologies in subsequent wastewater treatment processes such as clarification and filtration, without causing secondary pollution or blockage to the entire coal preparation system.

[0028] To address the issue of some clean coal particles being carried out of the underflow outlet 2 by heavy objects, resulting in waste, a hollow clean coal baffle shell 5 is installed at the underflow outlet 2. A baffle 7 is installed in a groove on its upper end face, with a precisely designed through-hole 8 on the baffle 7 to effectively block heavy objects. Therefore, when a heavy object falls onto the baffle 7, the reciprocating movement of the baffle 7 is similar to a vibration, pushing the heavy object away while shaking off the attached clean coal particles. The clean coal particles can then flow upward with the internal swirling flow. The through-hole 9 on the side wall of the baffle 7 allows heavy objects to enter, but restricts them from passing through the through-hole 9 into the clean coal baffle shell 5. This allows the clean coal particles attached to the heavy object to be scraped off when it hits the through-hole 9, and the clean coal particles can pass through the through-hole 9 into the clean coal baffle shell 5. Under the action of the internal swirling flow, they flow upward. Since the through-hole 8 allows clean coal particles to pass through, the clean coal particles can exit through the through-hole 8 and reach the overflow outlet 3.

[0029] In summary, the addition of calcium hydroxide to the heavy medium achieved dechlorination of high-chlorine coal, thus improving coal quality. The design of the clean coal baffle 5 and the baffle cover 7 initially blocked the entrainment of heavy objects on clean coal particles at the underflow outlet 2, improving the clean coal recovery rate and reducing clean coal loss.

[0030] Furthermore, it also includes: a rotating component 10 is rotatably disposed inside the clean coal retaining shell 5, located below the cover 7. The rotating component 10 has a protrusion 11, and the cover 7 has a protrusion 12. After the rotating component 10 rotates, the protrusion 12 pushes the protrusion 11, causing the cover 7 to reciprocate up and down; one end of the elastic component 13 acts on the bottom of the groove 6, and the other end acts on the cover 7, to provide the force for the cover 7 to reset after rising and falling.

[0031] In this embodiment, to achieve the reciprocating lifting and lowering of the baffle 7, a rotating component 10 is rotatably installed below the baffle 7 inside the clean coal retaining shell 5. The rotating component 10 has a first protrusion 11, and the baffle 7 has a second protrusion 12. When the rotating component 10 rotates, the first protrusion 11 interacts with the second protrusion 12 on the baffle 7. During the rotation of the rotating component 10, the second protrusion 12 pushes against the first protrusion 11, causing the baffle 7 to reciprocate within the groove. Simultaneously, an elastic component 13 is installed between the bottom of the groove and the baffle 7. When the baffle 7 is pushed upwards, the elastic component 13 provides a restoring force, allowing the baffle 7 to quickly return to its original position. For example, driven by a motor, the rotating component 10 continuously rotates at a certain speed, causing the baffle 7 to continuously rise and fall.

[0032] The reciprocating lifting and lowering motion of the baffle 7 can promptly push away the heavy objects that fall onto the baffle 7, and the shaken-off portion of the clean coal particles attached to it further reduces the probability of the clean coal particles being carried out of the bottom outlet 2 by the heavy objects, thereby improving the purity and efficiency of clean coal recovery.

[0033] Furthermore, it also includes: a rotating shaft 14 is rotatably disposed inside the clean coal baffle shell 5, and the rotation direction of the rotating shaft 14 is the same as the rotation direction of the rotating component 10; one end of the connecting component 15 is disposed on the rotating component 10, and the other end is disposed on the rotating shaft 14.

[0034] In this embodiment, to achieve the rotation of the rotating component 10, a rotating shaft 14 with the same rotation direction as the rotating component 10 is provided inside the clean coal retaining shell 5. The rotating component 10 and the rotating shaft 14 are connected by a connecting member 15. For example, the connecting member 15 can be a rigid connecting rod, with one end firmly welded to the rotating component 10 and the other end also welded to the rotating shaft 14. When the rotating component 10 starts to rotate under the action of external power, the rotating shaft 14 is driven to rotate synchronously through the connecting member 15.

[0035] The linkage design between the rotating shaft 14 and the rotating component 10 makes the power transmission of the entire device more stable and efficient. The rotation of the rotating component 10 can reliably drive the movement of other related components, providing a stable power foundation for realizing more functions using the rotating shaft 14 in the future, and helping to improve the stability and reliability of the entire heavy medium cyclone in the washing process.

[0036] Furthermore, it also includes: a flow guide 16 located below the underflow port 2, having a flow guide surface 17, a clean coal baffle shell 5 disposed on the flow guide 16, and a rotating shaft 14 rotatably disposed on the flow guide 16.

[0037] In this embodiment, to provide support and mounting positions for the clean coal baffle shell 5 and the rotating shaft 14, a guide member 16 is provided below the underflow port 2. The clean coal baffle shell 5 is mounted on the guide member 16, and the rotating shaft 14 is rotatably mounted on the guide member 16. Furthermore, the guide member 16 is also designed with a guide surface 17. When the material discharged from the underflow port 2 falls onto the guide surface 17 of the guide member 16, the guide surface 17 guides the material to flow in a specific direction. For example, the guide surface 17 can be designed as an inclined curved surface, allowing the material to slide smoothly along the curved surface and preventing material accumulation.

[0038] The guide vane 16 optimizes the flow direction of the material discharged from the bottom outlet 2, preventing material accumulation at the bottom and ensuring the continuity of the washing process. Simultaneously, it provides stable support and a suitable mounting position for the rotating shaft 14, making the entire device more robust and conducive to long-term stable operation.

[0039] Furthermore, it also includes: a pre-screening cover 18 is provided at the overflow port 3, the pre-screening cover 18 has a number of through holes 3 19, the through holes 3 19 are configured to block heavy objects and allow clean coal particles to pass through; pins 20 are provided on the pre-screening cover 18, there are a number of them, and at least one pin 20 extends from the inside to the outside in each through hole 3 19.

[0040] In this embodiment, to enhance the recovery of clean coal particles, a pre-screening cover 18 is installed at the overflow port 3. The pre-screening cover 18 has several through-holes 19, the size of which is carefully designed to block heavy objects and allow only clean coal particles to pass through. Simultaneously, at least one ejector pin 20 is installed within each through-hole 19, extending from the inside out. During the washing process, when material flows out of the overflow port 3 and passes through the pre-screening cover 18, clean coal particles pass through the through-holes 19, while heavy objects are blocked. The ejector pins 20 prevent material blockage at the through-holes 19; for example, if a large clean coal particle gets stuck near the through-hole 19, the ejector pin 20 can push it open, ensuring the unobstructed flow of the through-hole 19.

[0041] The design of the pre-screening hood 18 and the ejector pin 20 performs initial screening of the material at the overflow port 3, further reducing the mixing of heavy objects into the clean coal, improving the purity of the clean coal, and enhancing the quality of coal washing. Simultaneously, the ejector pin 20 effectively prevents clogging of the through-hole 3 19, ensuring the continuous and stable operation of the overflow port 3 screening function.

[0042] Furthermore, the amount of calcium hydroxide added was 1.5% of the coal sample mass, the feed pressure was 0.08 MPa, the feed flow rate was 4 L / min, the overflow port 3 had a diameter of 28 mm, and the underflow port 2 had a diameter of 20 mm.

[0043] In this embodiment, the calcium hydroxide addition experiment was conducted as follows: Five high-chlorine coal samples, each weighing 10 kg, were taken and labeled as B, C, D, and E, respectively. Calcium hydroxide was added to the coal samples at proportions of 0.5%, 1%, 1.5%, 2%, and 2.5% of the coal sample mass, and the samples were thoroughly mixed. A magnetite powder suspension with a density of 1.4 g / cm³ was prepared as the heavy medium. The coal samples with added calcium hydroxide were mixed with the heavy medium at a ratio of 1:3, and the mixture was passed through a heavy medium cyclone separator with a length of 300 mm, an overflow port diameter of 30 mm, and a bottom outlet diameter of 20 mm at a feed pressure of 0.1 MPa and a feed flow rate of 5 L / min. The results are as follows:

[0044] Based on the experimental results, when the calcium hydroxide addition was 1.5%, the chlorine content of the clean coal decreased to 0.4%, meeting the dechlorination requirements. Furthermore, the clean coal recovery rate and ash content showed minimal changes, indicating good separation performance. Therefore, the recommended calcium hydroxide addition was 1.5% of the coal sample mass.

[0045] Feed pressure adjustment experiment: Three 10kg samples of high-chlorine coal were taken, and 1.5% calcium hydroxide was added, mixed with heavy medium at a ratio of 1:3. The feed flow rate was kept constant at 5L / min, the hydrocyclone length at 300mm, the overflow port diameter at 30mm, and the underflow port diameter at 20mm. Experiments were conducted at feed pressures of 0.1MPa, 0.08MPa, and 0.06MPa, respectively. The chlorine content of the resulting clean coal products was analyzed, and the sorting indicators were tested. The results of the chlorine content analysis and sorting indicator testing of each sample of clean coal are as follows:

[0046] Experiments show that when the feed pressure is reduced to 0.08 MPa, the chlorine content of the clean coal decreases further, while the clean coal recovery rate and ash content remain within acceptable ranges. Therefore, the feed pressure was determined to be 0.08 MPa.

[0047] Feed flow rate adjustment experiment: Three 10kg samples of high-chlorine coal were taken, and 1.5% calcium hydroxide was added. The mixture was then mixed with heavy medium at a 1:3 ratio. The feed pressure was kept constant at 0.08MPa, the hydrocyclone length at 300mm, the overflow port diameter at 30mm, and the underflow port diameter at 20mm. Experiments were conducted at feed flow rates of 5L / min, 4L / min, and 3L / min, respectively. The chlorine content and sorting index of the resulting clean coal products were analyzed, and the following results were obtained:

[0048] Experimental results show that reducing the feed flow rate to 4 L / min significantly reduces the chlorine content of the clean coal while having minimal impact on the separation efficiency. Therefore, the feed flow rate was determined to be 4 L / min.

[0049] Overflow port 3 and bottom flow port 2 size adjustment experiment: Four 10kg high-chlorine coal samples were taken, and 1.5% calcium hydroxide was added. The mixture was then mixed with heavy medium at a ratio of 1:3. Maintaining a feed pressure of 0.08MPa, a feed flow rate of 4L / min, and a hydrocyclone length of 350mm, the sizes of overflow port 3 and bottom flow port 2 were adjusted. The experimental combinations were as follows: Overflow port 3 diameter 30mm, bottom flow port 2 diameter 20mm (control group); Overflow port 3 diameter 25mm, bottom flow port 2 diameter 18mm; Overflow port 3 diameter 35mm, bottom flow port 2 diameter 22mm; Overflow port 3 diameter 28mm, bottom flow port 2 diameter 20mm. The chlorine content and sorting index of the obtained clean coal products were analyzed, and the following results were obtained:

[0050] Experimental results show that when the diameter of overflow port 3 is adjusted to 28 mm and the diameter of underflow port 2 is kept at 20 mm, the chlorine content of clean coal is reduced effectively, and the separation efficiency is not significantly affected.

[0051] In summary, through extensive experiments and practical verification, this set of parameters enables the heavy medium hydrocyclone to achieve optimal dechlorination effect and clean coal recovery efficiency when washing high-chlorine coal. Under these parameters, calcium hydroxide reacts fully with the chlorine in the high-chlorine coal, achieving efficient dechlorination. Simultaneously, suitable feed pressure, flow rate, and the diameters of overflow port 3 and underflow port 2 ensure proper flow and separation of the heavy medium and high-chlorine coal within the hydrocyclone, reducing the likelihood of clean coal particles being carried out of underflow port 2 by heavy objects, thus improving the recovery rate and quality of clean coal.

[0052] Furthermore, it also includes: a spiral blade 21 disposed on the rotating shaft 14; a lever 22 oscillatingly disposed on the spiral blade 21, the oscillation direction of which is parallel to the rotation direction of the rotating shaft 14, the lever 22 oscillating after it is inserted into or extended out of the through hole 2 9 to push out the stuck heavy object; a fixing post 23 disposed on the spiral blade 21; one end of the elastic element 24 acts on the fixing post 23 and the other end acts on the lever 22 to provide force for the lever 22 to extend into the through hole 2 9.

[0053] In this embodiment, to more effectively discharge the refined coal particles entering the refined coal baffle shell 5 upwards, a spiral blade 21 is also provided on the rotating shaft 14. When the rotating shaft 14 rotates, it drives the spiral blade 21 to rotate as well, pushing the refined coal particles upwards. The paddle 22, under the action of the elastic element 24, tends to extend into the through hole 9. When a heavy object is found to be stuck in the through hole 9, as the spiral blade 21 rotates, the paddle 22 swings and extends into the through hole 9, pushing out the stuck heavy object. Each layer of spiral blades 21 is provided with a paddle 22, which is used to clear the heavy objects in the through hole 9 of that layer after rotation.

[0054] The combined design of the spiral blade 21, the paddle 22, the fixed column 23 and the elastic element 24 can enhance the upward flow of clean coal particles and automatically clear the heavy objects stuck in the through hole 29, effectively preventing the blockage of the through hole 29 and ensuring the normal operation of the screening function of the side wall of the cover 7.

[0055] Furthermore, the inner diameter of through hole 29 gradually narrows from the outside to the inside.

[0056] In this embodiment, when manufacturing the baffle 7, the inner diameter of the through hole 2 9 on the side wall of the baffle 7 is designed to gradually narrow from the outside to the inside. In the actual washing process, this allows the heavy objects to come into contact with or impact the inner wall of the through hole 2 9 more often, thereby scraping off or shaking off the fine coal particles attached to it.

[0057] Furthermore, the rotating component 10 is annular and hollow inside.

[0058] In this embodiment, the rotating component 10 is designed as a ring, which can minimize the obstruction of the upward flow of fine coal particles, reduce the overall weight of the equipment, reduce energy consumption, and improve the stability and efficiency of the rotation of the rotating component 10.

[0059] Furthermore, the top of the rotating shaft 14 has a spherical guide surface 25.

[0060] In this embodiment, when machining the rotating shaft 14, the top end of the rotating shaft 14 is machined into a spherical guide surface 25. During actual installation and operation, when material accidentally comes into contact with the top end of the rotating shaft 14, the spherical guide surface 25 can guide the material to slide down along the curved surface, preventing material from accumulating at the top end of the rotating shaft 14 and affecting the rotation of the rotating shaft 14.

[0061] The spherical guide surface 25 at the top of the rotating shaft 14 effectively prevents material from accumulating at the top of the rotating shaft 14, ensuring the smooth rotation of the rotating shaft 14, reducing problems such as jamming and wear of the rotating shaft 14 caused by material accumulation, improving the stability and service life of the equipment, and further ensuring the efficient and stable operation of the heavy medium hydrocyclone washing process.

[0062] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A heavy medium cyclone separator for high-chlorine coal washing, comprising a feed inlet (1), an underflow outlet (2), and an overflow outlet (3), characterized in that, The feed inlet (1) is used to introduce high-chlorine coal and heavy medium, the heavy medium including calcium hydroxide, and the hydrocyclone (4) includes: The clean coal baffle shell (5) is hollow inside and is set inside the hydrocyclone (4) at the bottom outlet (2). The upper end face of the clean coal baffle shell (5) has a groove (6). A baffle (7) is raised and lowered within the groove (6). The baffle (7) has several through holes (8). The through holes (8) are configured to block heavy objects from passing through the fine coal particles. The side wall of the fine coal baffle shell (5) has several through holes (9). The through holes (9) are configured to allow heavy objects to enter the through holes (9) but not pass through them. The rotating part (10) is rotatably disposed inside the clean coal baffle shell (5) and located below the baffle (7). The rotating part (10) has a protrusion one (11) and the baffle (7) has a protrusion two (12). After the rotating part (10) rotates, the protrusion two (12) pushes the protrusion one (11) to make the baffle (7) move up and down repeatedly. The elastic element (13) has one end acting on the bottom of the groove (6) and the other end acting on the cover (7) to provide the force for the cover (7) to return to its original position after being raised or lowered; A rotating shaft (14) is rotatably disposed inside the clean coal baffle shell (5), and the rotation direction of the rotating shaft (14) is the same as the rotation direction of the rotating component (10); The connector (15) has one end mounted on the rotating part (10) and the other end mounted on the rotating shaft (14); A pre-screen cover (18) is provided at the overflow port (3). The pre-screen cover (18) has several through holes (19), which are configured to block heavy objects and allow fine coal particles to pass through. A number of ejector pins (20) are provided on the pre-screening cover (18), and at least one ejector pin (20) extends outward from the inside of each of the three through holes (19).

2. The heavy medium cyclone separator for high-chlorine coal washing according to claim 1, characterized in that, Also includes: The guide (16) is located below the bottom outlet (2) and has a guide surface (17). The clean coal baffle shell (5) is disposed on the guide (16) and the rotating shaft (14) is rotatably disposed on the guide (16).

3. A heavy medium cyclone separator for high-chlorine coal washing according to claim 1, characterized in that, The amount of calcium hydroxide added is 1.5% of the mass of high-chlorine coal, the feed pressure is 0.08MPa, the feed flow rate is 4L / min, the overflow port (3) has a diameter of 28mm, and the underflow port (2) has a diameter of 20mm.

4. The heavy medium cyclone separator for high-chlorine coal washing according to claim 1, characterized in that, Also includes: A helical blade (21) is disposed on the rotating shaft (14); The paddle (22) is oscillating on the spiral blade (21), and its oscillation direction is parallel to the rotation direction of the rotating shaft (14). After the paddle (22) oscillates, it is used to insert into or extend out of the through hole (9) to push out the stuck heavy object. A fixing post (23) is provided on the spiral blade (21); The second elastic element (24) acts on the fixed post (23) at one end and on the paddle (22) at the other end, and is used to provide the force for the paddle (22) to extend into the second through hole (9).

5. A heavy medium cyclone separator for high-chlorine coal washing according to claim 1, characterized in that, The inner diameter of the second through hole (9) gradually narrows from the outside to the inside.

6. A heavy medium cyclone separator for high-chlorine coal washing according to claim 1, characterized in that, The rotating component (10) is annular and hollow inside.

7. A heavy medium cyclone separator for high-chlorine coal washing according to claim 1, characterized in that, The top of the rotating shaft (14) has a spherical guide surface (25).

Images