An efficient sand removal device and method of use

Abstract

The application provides a high-efficiency sand removing device, which comprises a sand removing tank, a separator arranged in the sand removing tank, and a stirring device; the separator comprises a conical lower cone part, the caliber of the bottom opening of the lower cone part is larger than the caliber of the top opening; the stirring device comprises a stirring shaft vertically arranged in the middle part of the sand removing tank, the bottom end of the stirring shaft is connected with a stirring paddle, the top end is connected to a stirrer arranged outside the sand removing tank, and the stirring paddle is arranged above the separator; a feeding pipe is arranged on the side wall of the bottom part of the sand removing tank and is communicated with the lower cone part, the outlet end of the feeding pipe is opened upward, and a liquid outlet is arranged on the side wall of the top part of the sand removing tank; a conical tank bottom in an inverted conical shape is arranged on the bottom part of the sand removing tank, a sand outlet is arranged in the middle part of the bottom end of the conical tank bottom, and the sand outlet, the separator and the stirring shaft are coaxially arranged. The sand removing device can effectively improve the sand removing efficiency and reduce the influence on the subsequent treatment system.

Description

Technical Field

[0001] This invention belongs to the field of sand-water separation technology and equipment, specifically relating to a high-efficiency sand removal device and its usage method. Background Technology

[0002] As carbon emissions peak and the carbon neutrality process progresses, the utilization of renewable energy is receiving increasing attention. Anaerobic fermentation, as a core functional area for converting renewable materials into energy, is gaining even greater importance. To ensure the long-term stable operation of anaerobic fermentation, pretreatment is particularly crucial.

[0003] Food waste, as an important component of organic waste, typically undergoes a pretreatment process centered on "screening + pulping + oil extraction." Currently, grit removal usually employs hydrocyclones and spiral sand separators, either individually or in combination. While these methods effectively remove larger-diameter grit, smaller grit particles are easily disturbed by water flow or equipment, causing them to float back to the surface after settling and enter subsequent treatment systems. This accelerates the wear of the three-phase separator and leads to grit deposition in the anaerobic tank, requiring regular tank cleaning. Livestock manure, introduced during feeding or bedding production, also introduces grit with a wide range of particle sizes. If this grit is not effectively removed, it can clog pipes, wear down equipment, and increase cleaning workload.

[0004] Therefore, how to effectively remove sand and improve sand removal efficiency to reduce the impact on subsequent treatment systems, especially for sand and gravel with a wide particle size distribution in waste, remains an urgent problem to be solved. Summary of the Invention

[0005] In view of this, the present invention provides a high-efficiency sand removal device and a method of use to achieve efficient removal of sand and gravel of different particle sizes.

[0006] The technical solution of this invention is: a high-efficiency sand removal device, comprising a sand removal tank, a separator disposed inside the sand removal tank and open at both ends, and a stirring device disposed above the separator; wherein,

[0007] The separator includes a conical lower cone, the diameter of the bottom opening of the lower cone is larger than the diameter of the top opening; the stirring device includes a stirring shaft vertically disposed in the middle of the sand removal tank, the bottom end of the stirring shaft is connected to a stirring paddle, and the top end is connected to a stirrer disposed outside the sand removal tank, the stirring paddle being disposed above the separator.

[0008] The bottom side wall of the sand removal tank is provided with a feed pipe that connects to the lower cone section. The outlet end of the feed pipe opens upward. The top side wall of the sand removal tank is provided with a liquid outlet. The bottom of the sand removal tank is provided with an inverted cone-shaped tank bottom. The bottom center of the cone-shaped tank bottom is provided with a sand outlet. The sand outlet, separator and stirring shaft are coaxially arranged.

[0009] The present invention is further configured such that the distance between the top of the separator and the stirring paddle above it is 200~400mm.

[0010] The present invention is further configured such that an inverted conical inner conical tank bottom with openings at the top and bottom is provided between the conical tank bottom and the lower conical part, the top port diameter of the inner conical tank bottom is equal to the inner diameter of the sand removal tank, the horizontal height of the top of the inner conical tank bottom is not lower than the horizontal height of the bottom of the lower conical part, and a gap is provided between the bottom of the lower conical part and the inner conical tank bottom.

[0011] The sand removal device described in this invention features a separator that reduces the influence of the agitator on the water flow between the separator and the bottom of the inner conical tank, allowing it to settle and improving the removal efficiency of small sand particles. The inner conical tank bottom shortens the settling time of the sand particles trapped by the separator, increasing the probability of small sand particles settling and reducing the probability of them flowing out with the liquid through gaps. Furthermore, during the subsequent cleaning of the deposited sand particles, the sand particles collide violently with the cleaning gas. The inner conical tank bottom significantly reduces the probability of the deposited sand particles returning to the liquid phase due to the gas cleaning of organic matter on the sand particle surface, increasing the cleanliness of the cleaning process and the sand particle retention rate.

[0012] The present invention is further configured such that the vertical height Δh of the gap between the bottom end of the lower cone portion of the separator and the bottom of the inner cone tank is ≥50mm, and the horizontal height of the top end of the inner cone tank is not lower than the horizontal height of the bottom end of the lower cone portion.

[0013] In this invention, the height of the gap between the lower cone of the separator and the bottom of the inner cone tank is designed to facilitate the sliding of sand and gravel deposited on the outer wall of the separator to the bottom of the inner cone, and ultimately into the conical tank. Furthermore, since the liquid rises in two directions—one vertically upward and the other parallel to the bottom of the inner cone—if the distance Δh between the separator and the bottom of the inner cone is too large, the ratio of the distance from the sand and gravel to the slope of the separator to the slope velocity will be greater than the ratio of Δh to the vertical velocity of the sand and gravel, resulting in the sand and gravel flowing out without being intercepted. Conversely, if the gap is too small, it will hinder the inflow of sand and gravel from the outer wall of the separator and the outflow of the internal liquid.

[0014] The invention is further configured such that at least two radially arranged vertical baffles are evenly distributed along the inner wall of the sand removal tank, and one side of each vertical baffle is connected to the inner wall of the sand removal tank. After the stirring device is started, the sand and gravel settle upon contact with the side plate under the action of centrifugal force.

[0015] In this invention, the vertical baffle is directly welded to the inner wall of the sand removal tank, or the vertical baffle is detachably installed on the inner wall of the sand removal tank through a connector.

[0016] The present invention is further configured such that the width of the vertical baffle is 100~150mm.

[0017] The present invention is further configured such that the ratio of the height to the diameter of the sand removal tank is 1.5 to 3.0, and the ratio of the height of the conical tank bottom to the height of the sand removal tank is 0.2 to 1.2.

[0018] The present invention is further configured such that the ratio of the height of the lower cone portion of the separator to the height of the sand removal tank is 0.15 to 0.6.

[0019] The present invention is further configured such that the bottom end of the vertical baffle is connected to the top of the side wall of the sand removal tank, the bottom end of the vertical plate is connected to the bottom of the side wall of the sand removal tank above the bottom of the inner cone tank, and the bottom port diameter of the lower cone is equal to the difference between the inner diameter of the sand removal tank and twice the width of the vertical baffle.

[0020] The present invention is further configured such that the horizontal angle between the generatrix of the lower cone and the horizontal plane is 55~65°.

[0021] The present invention is further configured such that the angle between the generatrix of the inner conical tank bottom and the horizontal plane is 45~55°, and the angle between the generatrix of the conical tank bottom and the horizontal plane is 55~75°.

[0022] The invention is further configured such that the outlet end of the feed pipe opens vertically upward and is coaxially located in the middle of the lower conical portion. A water inlet baffle is connected above the outlet end of the feed pipe, and the water inlet baffle is connected to the feed pipe via a connector. Preferably, the water inlet baffle is horizontally located above the outlet end of the feed pipe. This configuration ensures that the liquid transported into the lower conical portion via the feed pipe is blocked by the water inlet baffle and collides with the inner wall of the lower conical portion, preventing the liquid discharged from the feed pipe from being directly discharged through the outlet at the top of the lower conical portion.

[0023] The invention is further configured such that the separator includes an inverted conical upper cone located above the lower cone. The diameter of the bottom opening of the upper cone is smaller than the diameter of its top opening. The bottom opening of the upper cone and the top opening of the lower cone are connected and have the same diameter. The upper and lower cones form an hourglass-shaped separator. This configuration allows the gravel flowing out of the liquid to fall under the centrifugal force of the mixer, and the outer wall of the separator reduces the obstruction of water flow outside the separator, which is beneficial for forming a settling zone and promoting particle sedimentation.

[0024] The present invention is further configured such that the height of the upper cone and the height of the sand removal tank are 0.05~0.4.

[0025] The present invention is further configured such that the height and top port diameter of the upper cone are smaller than the height and top port diameter of the lower cone.

[0026] The invention is further configured such that several gas flushing pipes are connected to the side wall at the bottom of the conical tank. The inlet of each gas flushing pipe is connected to an external compressed air source or steam source, and a deodorizing exhaust port is provided at the top of the sand removal tank. Hot steam or compressed air is used to clean the sand and gravel deposited in the bottom of the conical tank, reducing the content of organic matter attached to the sand and gravel. The cleaned gas is discharged through the deodorizing exhaust port and then enters the subsequent outlet system for further processing. Preferably, there are 2 to 4 gas flushing pipes.

[0027] In this invention, the compressed air is 0.6-0.8 MPa; for materials with high viscosity or liquids that require subsequent heating, steam cleaning is preferred.

[0028] The invention is further configured such that the outlet of the gas flushing pipe is radially tangent to the bottom sidewall of the conical tank. This configuration reduces the adhesion of sand and gravel to the conical wall, resulting in better sand and gravel cleaning.

[0029] The present invention is further configured such that the sand removal device also includes a screw conveyor, and the sand outlet at the bottom end of the conical tank is connected to the sand inlet pipe of the screw conveyor through a sand removal pipe.

[0030] The present invention is further configured such that the screw conveyor is a shaftless screw, the bottom of the shaftless screw is provided with a ball valve, and the motor of the shaftless screw is a variable frequency motor that can rotate in both directions.

[0031] The invention is further configured such that a cleaning inlet is provided on the bottom of the conical tank for manual cleaning, and at least one gas flushing pipe is provided on the sand discharge pipe; and an inspection hole is provided on the top of the sand removal tank.

[0032] The present invention is further configured such that the sand removal tank is also equipped with a liquid level sensor and a temperature sensor for monitoring the liquid level and temperature inside the sand removal tank.

[0033] The present invention also provides a high-efficiency sand removal method, which uses the above-mentioned sand removal device and includes the following steps:

[0034] (1) The liquid to be desanded is transported through the feed pipe to the lower cone of the separator and output upward with the feed pipe. It collides with the inner wall of the separator to achieve the initial separation of sand and water. The sand falls rapidly and settles into the bottom of the cone-shaped tank through the bottom of the inner cone tank.

[0035] (2) As the liquid is continuously input, the liquid level in the sand removal tank and separator gradually rises. When the liquid level rises above the top of the separator, the liquid is discharged from the top outlet of the separator. When the liquid level is higher than the stirring paddle, the stirring device is turned on. Under the action of centrifugal force, the sand and gravel collide with the vertical baffle and settle.

[0036] (3) When the sand and gravel in the conical tank bottom reaches a certain amount, steam or compressed air is supplied to the conical tank bottom to clean the sand and gravel in the conical tank bottom. After the cleaning is completed, the sand and gravel deposited in the conical tank bottom is transported out through the sand outlet.

[0037] (4) After the sand and gravel are transported, stop the sand discharge and carry out the next sand and gravel accumulation.

[0038] The present invention is further configured such that, in step (2), the rotation speed of the mixer is 10-30 r / min.

[0039] The present invention is further configured such that, in step (3), the gravel in the bottom of the conical tank is output to the outside via a screw conveyor; the cleaning time is 5-10 minutes, and the screw conveyor is turned on again 5 minutes after the rinsing is completed.

[0040] The present invention is further configured such that, in step (3), when the gravel deposited to more than half the volume between the bottom of the conical tank and the bottom of the inner conical tank, the gravel deposited in the bottom of the conical tank is cleaned.

[0041] Compared with the prior art, the present invention has the following beneficial effects:

[0042] (1) The present invention employs multiple sand removal methods for sand and gravel in liquids, utilizing inertial sand removal, centrifugal sand removal, gravity sand removal and other sand removal functions to remove sand and gravel of various particle sizes from the material, thereby improving the removal rate of sand and gravel of different particle sizes.

[0043] (2) The sand removal device of the present invention adopts a structure combining a double-layer tank bottom with a conical tank bottom and an inner conical tank bottom and an hourglass-shaped separator. With this configuration, when the sand and gravel deposited in the conical tank bottom are washed, the small sand and gravel that are easily washed upward will settle down again after collision, thereby reducing the amount overflowing from the outlet; at the same time, when the stirring device is turned on, the disturbance to the liquid at the bottom of the conical tank bottom can be significantly reduced, creating conditions for the static sedimentation of small-diameter sand and gravel, and further improving the removal effect of small-diameter sand and gravel.

[0044] (3) The present invention can clean sand and gravel online, reduce the content of attached organic matter in the sand and gravel, and improve the cleanliness of the sand and gravel. Attached Figure Description

[0045] Figure 1This is a front view of the sand removal device described in this invention.

[0046] Figure 2 for Figure 1 Vertical cross-sectional view.

[0047] Figure 3 This is the structure of the separator in Example 1.

[0048] Figure 4 This is a schematic diagram showing the positional relationship between the bottom of the inner conical tank and the lower conical part of the separator in this embodiment.

[0049] Figure 5 This is a top view of the sand removal device described in this invention.

[0050] Figure 6 This is a schematic diagram of the separator in Example 2.

[0051] Figure 7 This is a vertical cross-sectional view of the sand removal device in Example 2.

[0052] The components are as follows: 1. Sand removal tank; 11. Feed pipe; 12. Liquid outlet; 13. Water inlet baffle; 14. Supporting round steel; 15. Deodorizing exhaust port; 16. Liquid level sensor interface; 17. Temperature sensor interface; 18. Inspection hole; 2. Separator; 21. Lower cone; 22. Support component; 23. Upper cone; 3. Stirring device; 31. Stirring shaft; 32. Stirring paddle; 33. Mixer; 4. Conical tank bottom; 41. Sand outlet; 42. Gas flushing pipe; 43. Cleaning manhole; 5. Inner conical tank bottom; 6. Vertical baffle; 7. Screw conveyor; 8. Sand outlet pipe; 81. Second gas flushing pipe. Detailed Implementation

[0053] The specific embodiments of the invention will be further described below with reference to the accompanying drawings and examples. The following examples are only used to clearly illustrate the technical solutions of the present invention and should not be construed as limiting the scope of protection of the present invention. Example 1

[0054] refer to Figure 1 and Figure 2 This invention provides a high-efficiency sand removal device, comprising a sand removal tank 1, a separator 2 disposed inside the sand removal tank 1 and open at both ends, and a stirring device 3 disposed above the separator 2; wherein,

[0055] The separator 2 includes a conical lower cone 21, the diameter of the bottom opening of the lower cone 21 is larger than the diameter of the top opening, and the inner diameter of the separator 2 is smaller than the inner diameter of the sand removal tank 1.

[0056] The stirring device 3 includes a stirring shaft 31 vertically arranged in the middle of the sand removal tank 1. The bottom end of the stirring shaft 31 is connected to a stirring paddle 32, and the top end is connected to a mixer 33 located on the top of the outer side of the sand removal tank 1. The stirring paddle 32 is located directly above the separator 2.

[0057] The sand removal tank 1 has a feed pipe 11 connected to the lower cone 21 on the bottom side wall. The outlet end of the feed pipe 11 opens upward. The sand removal tank 1 has a liquid outlet 12 on the top side wall. The horizontal height of the liquid outlet 12 is higher than that of the stirring paddle 32. The bottom of the sand removal tank 1 has an inverted cone-shaped tank bottom 4. The bottom center of the cone-shaped tank bottom 4 has a sand outlet 41. The sand outlet 41, the separator 2 and the stirring shaft 31 are coaxially arranged.

[0058] In this embodiment, as Figure 3 As shown, a plurality of support members 22 are distributed along the outer side wall of the lower cone portion 21. The other end of the support member 22 is connected to the inner side wall of the sand removal tank 1. The separator 2 is fixed inside the sand removal tank 1 by the support member 22.

[0059] In this embodiment, the distance between the top of the separator 2 and the stirring paddle 32 above it is 200~400mm.

[0060] like Figure 2 and Figure 4 As shown, an inverted conical inner conical tank bottom 5 with openings at the top and bottom is provided between the conical tank bottom 4 and the lower conical part 21. The top port diameter of the inner conical tank bottom 5 is equal to the inner diameter of the sand removal tank 1. The horizontal height of the top of the inner conical tank bottom 5 is not lower than the horizontal height of the bottom of the lower conical part 21, and there is a gap between the bottom of the lower conical part 21 and the inner conical tank bottom 5.

[0061] Furthermore, the vertical height Δh of the gap between the bottom end of the lower cone 21 and the bottom of the inner cone tank 5 is ≥50mm.

[0062] Furthermore, the ratio of the height to the diameter of the sand removal tank 1 is 1.5 to 3, the ratio of the height of the lower cone 21 to the height of the sand removal tank 1 is 0.15 to 0.6, and the ratio of the height of the conical tank bottom 4 to the height of the sand removal tank 1 is 0.2 to 1.4.

[0063] Furthermore, in this embodiment, the horizontal angle α between the generatrix of the lower conical portion 21 and the horizontal plane is 55~65°, the horizontal angle β between the generatrix of the inner conical tank bottom 5 and the horizontal plane is 45~55°, and the horizontal angle γ between the generatrix of the conical tank bottom 4 and the horizontal plane is 55~75°.

[0064] Preferably, the outlet end of the feed pipe 11 is vertically upward and coaxially located in the middle of the lower conical portion 21. A horizontal water inlet baffle 13 is provided above the outlet end of the feed pipe 11, and the water inlet baffle 13 is connected to the feed pipe via a connector. In this embodiment, the water inlet baffle 13 is connected to the outlet end of the feed pipe 11 via several supporting round steel bars 14. This arrangement ensures that the liquid transported into the lower conical portion 21 through the feed pipe 11 is blocked by the water inlet baffle 13 and collides with the inner wall of the lower conical portion 21, preventing the liquid discharged from the feed pipe 11 from being directly discharged through the top outlet of the lower conical portion 21.

[0065] Several radially distributed vertical baffles 6 are evenly distributed along the inner sidewall of the sand removal tank 1. One side of each vertical baffle 6 is connected to the inner sidewall of the sand removal tank 1. In this embodiment, one side of each vertical baffle 6 is welded to the inner sidewall of the sand removal tank 1.

[0066] Furthermore, the conical tank bottom 4 is provided with several gas flushing pipes 42 on its side wall. The outlet end of the gas flushing pipe 42 is radially tangent to the side wall of the conical tank bottom 4. The inlet end of the gas flushing pipe 42 is connected to an external hot steam source or a 0.6~0.8Mpa compressed air source for cleaning the sand and gravel settled at the bottom of the conical tank bottom 4. The top of the sand removal tank 1 is provided with a deodorizing exhaust port 15. The flushed gas is discharged through the deodorizing exhaust port 15 on the top of the tank and enters the subsequent outlet system for further processing.

[0067] Furthermore, the sand removal device also includes a screw conveyor 7, and the sand outlet 41 at the bottom end of the conical tank bottom 4 is connected to the sand inlet pipe of the screw conveyor 7 via a sand outlet pipe 8. In this embodiment, at least one second gas flushing pipe 81 is also connected to the side wall of the sand outlet pipe 8.

[0068] like Figure 5 As shown, the top of the sand removal tank 1 is also provided with a liquid level sensor interface 16 and a temperature sensor interface 17 for installing the liquid level sensor and the temperature sensor. The top of the sand removal tank 1 is also provided with an inspection hole 18, and the bottom side wall of the conical tank bottom 4 is also provided with a cleaning manhole 43 for manual cleaning.

[0069] The present invention also provides a high-efficiency sand removal method, which uses the above-mentioned sand removal device and includes the following steps:

[0070] (1) The liquid to be desanded is transported through the feed pipe 11 to the lower cone 21 of the separator 2 and output upward with the feed pipe 11, and collides with the inner wall of the separator 2 to achieve the initial separation of sand and liquid. The sand falls rapidly and settles into the cone bottom 4 through the inner cone bottom 5.

[0071] (2) As the liquid is continuously input, the liquid level in the sand removal tank 1 and the separator 2 gradually rises. When the liquid level rises further to a height higher than the top of the separator 2, the liquid is discharged from the top outlet of the lower cone 21. When the liquid level height measured by the liquid level sensor is higher than the height of the stirring paddle 32, the stirring device 3 is automatically turned on. Under the action of centrifugal force, the sand and gravel collide with the vertical baffle 6 and settle.

[0072] (3) When the gravel deposits to more than half the volume between the inner conical tank bottom 5 and the conical tank bottom 4, hot steam or 0.6-0.8 MPa compressed air is introduced into the conical tank bottom 4 through the gas flushing pipe 42 and the second gas flushing pipe 81 to clean the gravel settled at the bottom.

[0073] (4) After cleaning, turn on the screw conveyor 7 to transport the sand and gravel deposited in the bottom of the conical tank 4 to the outside. After the transportation is completed, stop the operation of the screw conveyor and start running again after the sand and gravel have accumulated to a certain amount.

[0074] Further, in step (2), the speed of the mixer 33 is 10-30 r / min; in step (3), the cleaning time is 5-10 min, and the screw conveyor is turned on 5 min after rinsing is completed.

[0075] In this embodiment, the screw conveyor is a shaftless screw, the bottom of the shaftless screw is provided with a ball valve, and the motor of the shaftless screw is a variable frequency motor that can rotate in both directions. Example 2

[0076] The difference between the high-efficiency sand removal device described in this embodiment and that in Embodiment 1 lies in the structure of the separator 2. For example... Figure 6 and Figure 7 As shown, in this embodiment, the separator 2 further includes an inverted cone-shaped upper cone 23 disposed above the lower cone 21. The upper cone 23 and the lower cone 21 form an hourglass-shaped separator. The bottom opening diameter of the upper cone 23 is smaller than the top opening diameter. The bottom opening of the upper cone and the top opening of the lower cone are connected and have the same diameter. The top opening diameter of the lower cone 21 is larger than the top opening diameter of the upper cone 23. The height of the upper cone 23 and the height of the sand removal tank 1 are 0.05~0.4. Example 3

[0077] In this embodiment, the sand removal device described in Embodiment 2 is used to treat kitchen waste. The kitchen waste to be sanded is kitchen waste that has been pulped and heated to 40~50℃. In this embodiment, the feed rate is 8t / h, the height of the sand removal tank 1 is 4.25m, the heights of the upper cone 23 and the lower cone 21 of the separator 2 are 0.35m and 1.2m respectively, the bottom port diameter of the lower cone 21 is 1.6m, the width of the vertical baffle 6 is 100~150mm, and the vertical height Δh of the gap between the bottom end of the lower cone 21 and the bottom of the inner cone tank 5 is 50mm.

[0078] like Figure 7 As shown, the sand removal device described above includes the following steps:

[0079] (1) The kitchen waste that has been pulped and heated to 40~45℃ is continuously transported through the feed pipe 11 to the lower cone 21 of the separator 2 and output upward with the feed pipe 11. It collides with the inner wall of the separator 2 to achieve the initial separation of sand and liquid. The sand falls rapidly and settles into the cone bottom 4 through the inner cone bottom 5.

[0080] (2) When the liquid level sensor detects that the liquid level in the sand removal tank 1 is higher than the horizontal height of the stirring paddle 32 by 300mm, the stirring device 3 is automatically turned on to stir the slurry in the sand removal tank 1. The sand and gravel in the slurry collide with the vertical baffle 6 and settle.

[0081] (3) When the gravel is deposited to half the volume between the inner conical tank bottom 5 and the conical tank bottom 4, steam is used to enter the conical tank bottom 4 through the gas flushing pipe 42 and the second gas flushing pipe 81 to clean the gravel settled at the bottom, and at the same time the deodorizing exhaust port 15 is opened.

[0082] (4) After steam rinsing for 5-10 minutes, stop rinsing. After 5 minutes, turn on the screw conveyor 7 to transport the deposited sand and gravel out through the screw conveyor 7. After the sand and gravel are transported, turn off the screw conveyor. Start running again after the sand and gravel have accumulated to a certain amount.

[0083] The liquid before entering the sand removal device and the liquid discharged through outlet 12 are tested to determine the sand removal effect of the sand removal device. In this embodiment, the sand removal device has a removal rate of ≥99% for sand and gravel >5mm, a removal rate of ≥95% for sand and gravel 1-5mm, and a removal rate of ≥90% for sand and gravel 0.5~1mm; the organic matter content in the discharged sand particles is <5%.

[0084] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A high-efficiency sand removal device, comprising a sand removal tank, a separator disposed inside the sand removal tank and open at both ends, and a stirring device disposed above the separator; characterized in that, The separator includes a conical lower cone, the diameter of the bottom opening of the lower cone is larger than the diameter of the top opening; the stirring device includes a stirring shaft vertically disposed in the middle of the sand removal tank, the bottom end of the stirring shaft is connected to a stirring paddle, and the top end is connected to a stirrer disposed outside the sand removal tank, the stirring paddle being disposed above the separator. The bottom side wall of the sand removal tank is provided with a feed pipe that connects to the lower cone section. The outlet end of the feed pipe opens upward. The top side wall of the sand removal tank is provided with a liquid outlet. The bottom of the sand removal tank is provided with an inverted cone-shaped tank bottom. The bottom center of the cone-shaped tank bottom is provided with a sand outlet. The sand outlet, separator and stirring shaft are coaxially arranged. Between the conical tank bottom and the lower conical part, there is also an inverted conical inner conical tank bottom with openings at the top and bottom. The top port diameter of the inner conical tank bottom is equal to the inner diameter of the sand removal tank. The horizontal height of the top of the inner conical tank bottom is not lower than the horizontal height of the bottom of the lower conical part, and there is a gap between the bottom of the lower conical part and the inner conical tank bottom. The vertical height Δh of the gap between the bottom of the lower conical part and the inner conical tank bottom is ≥50mm. The separator also includes an inverted cone-shaped upper cone located above the lower cone. The diameter of the bottom opening of the upper cone is smaller than the diameter of its top opening. The bottom opening of the upper cone and the top opening of the lower cone are connected and have the same diameter. The upper cone and the lower cone form an hourglass-shaped separator.

2. The high efficiency sand removal device of claim 1, wherein, At least two radially arranged vertical baffles are evenly distributed along the inner wall of the sand removal tank, and one side of each vertical baffle is connected to the inner wall of the sand removal tank.

3. The high efficiency sand removal device of claim 1, wherein, The ratio of the height to the diameter of the sand removal tank is 1.5 to 3.0, the ratio of the height of the conical tank bottom to the height of the sand removal tank is 0.2 to 1.2, and the ratio of the height of the lower cone to the height of the sand removal tank is 0.15 to 0.

6.

4. The high efficiency sand removal device of claim 1, wherein, The angle between the generatrix of the lower cone and the horizontal plane is 55~65°, the angle between the generatrix of the inner cone bottom and the horizontal plane is 45~55°, and the angle between the generatrix of the cone bottom and the horizontal plane is 55~75°.

5. The high efficiency sand removal device of claim 1, wherein, The outlet end of the feed pipe opens vertically upward and is coaxially located in the middle of the lower cone. A water inlet baffle is connected above the outlet end of the feed pipe.

6. The high efficiency sand removal device of claim 1, wherein, Several gas flushing pipes are connected to the bottom side wall of the conical tank. The inlet end of the gas flushing pipe is connected to an external compressed air source or steam source. A deodorizing exhaust port is opened at the top of the sand removal tank. A liquid level sensor and a temperature sensor are provided on the sand removal tank.

7. A method of using the high efficiency sand removal device of claim 2, wherein, Includes the following steps: (1) The liquid to be desanded is transported through the feed pipe to the lower cone of the separator and output upward with the feed pipe. It collides with the inner wall of the separator to achieve the initial separation of sand and water. The sand falls quickly and settles to the bottom of the conical tank. (2) As the liquid is continuously input, the liquid level in the sand removal tank and separator gradually rises. When the liquid level rises above the top of the separator, the liquid is discharged from the top outlet of the separator. When the liquid level is higher than the height of the stirring paddle, the stirring device is turned on. Under the action of centrifugal force, the sand and gravel hit the vertical baffle and settle. (3) When the sand and gravel are deposited in the bottom of the conical tank to a certain amount, steam or compressed air is supplied to the bottom of the conical tank to clean the sand and gravel deposited in the bottom of the conical tank. After the cleaning is completed, the sand and gravel deposited in the bottom of the conical tank is transported out through the sand outlet. (4) After the sand and gravel are transported, stop the sand discharge and carry out the next sand and gravel accumulation.

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