Deep well conveying pipeline pressure relief and slurry stirring process and device

Abstract

The invention provides a deep well conveying pipeline pressure relief and slurry stirring process and device, and belongs to the technical field of mine filling slurry conveying. The device comprises a buffer stirring tank, a feeding pipe and a discharging pipe, wherein the feeding pipe and the discharging pipe are connected with the buffer stirring tank; a flow aiding step and a stirring structure are arranged in the buffer stirring tank; the stirring structure is arranged in the horizontal direction; and resistance increasing blades are arranged in the feeding pipe. The standing time of slurry in the tank body is prolonged, the stirring effect of the stirring structure is enhanced, and the segregation phenomenon of the slurry is prevented. The single-time pressure relief strength is high, the slurry flow velocity slowing effect is good, original multiple-time pressure relief can be replaced by single-time pressure relief, conveying process nodes are reduced, and conveying reliability is improved. The pressure relief device is simple in structure, free of a precise structure and durable, large-space pressure relief is adopted to replace traditional in-pipe pressure relief, abrasion of a pipeline pressure relief point is greatly reduced, and the pressure relief device can serve as an accident pool to reduce underground slurry pollution when the pipeline is blocked during conveying.

Description

Technical Field

[0001] The invention relates to the technical field of mine filling slurry transportation, and in particular to a deep well transportation pipeline pressure relief and slurry stirring process and device. Background Art

[0002] In recent years, the mining depth of underground mines has been increasing with the exploration and development of mineral resources. Many coal mines and metal mines have tunnels with a depth of more than one kilometer. The accompanying high pressure, high heat, and high stress are major problems that need to be solved urgently in deep-well resource mining at this stage. With the support of current policies and mining technologies, the backfilling method has become the only way to manage empty areas after mining. The steady-state transportation of high-concentration paste backfill slurry is a major challenge facing deep-well mining. During the transportation of backfill slurry in deep-well mines, due to the long vertical pipeline length and small filling multiples, the slurry is prone to segregation, empty pipes, and air bubbles, which will pose a great challenge to the reliability of the pipeline. How to relieve the pressure on the pipeline to regulate the conveying pressure within the safety limit and smoothly deliver the slurry to the backfilling site is an unavoidable technical problem.

[0003] In order to solve the above problems, many inventions have been tried. For example, the invention patent with publication number CN116025752A discloses a water supply pipeline pressure relief device, which adopts manifold monitoring pressure relief technology and is provided with an anti-backflow plate, and can automatically adjust the pressure relief pressure according to the pipeline pressure. However, for high-concentration filling slurry, there are risks such as high wear and easy leakage; the invention patent with publication number CN217108354U discloses an oil pipeline pressure relief device, which uses a two-stage box-type pressure relief structure to effectively reduce the impact force of the fluid, and has a good pressure relief effect for single-phase liquid media such as petroleum and ethanol. For two-phase flow similar to filling slurry, there are risks such as segregation and sedimentation in the box; the invention patent with publication number CN113701059A discloses a pipeline pressure relief device for fluid transportation and a method of use thereof, which adopts a diverter box and a spring piston to cooperate for pressure relief, has a simple structure, and is easy to operate and practical, but requires storage and discharge space outside the device for the pressure relief fluid, and occupies a large area.

[0004] In general, the existing pipeline pressure relief devices are only suitable for single-phase flow and cannot overcome the sedimentation and segregation sites during the pressure relief process of the filling slurry. Improper settings not only fail to play a pressure relief role, but may also increase the risk of pipe blockage.

[0005] In view of this, it is necessary to design an improved deep well conveying pipeline pressure relief and slurry mixing process and device to solve the above problems. Summary of the invention

[0006] In view of the above-mentioned defects of the prior art, the purpose of the present invention is to provide a deep well transportation pipeline pressure relief and slurry stirring process and device, which can relieve the pressure of the slurry during the transportation process and prevent the slurry from segregating and settling by re-stirring.

[0007] To achieve the above-mentioned objectives, the present invention provides a deep well conveying pipeline pressure relief and slurry stirring device, comprising a buffer stirring tank and a feed pipe and a discharge pipe connected to the buffer stirring tank; the interior of the buffer stirring tank is provided with a flow-aiding step and a stirring structure; the stirring structure is arranged in a horizontal direction; and a resistance-increasing blade is provided in the feed pipe.

[0008] As a further improvement of the present invention, the flow-aiding step extends along the inner wall of the cache stirring tank to the bottom, and the number of the flow-aiding step is ≥3.

[0009] As a further improvement of the present invention, the feed pipe is arranged in a U-shape. A feed port connecting the feed pipe and the inside of the buffer agitation tank is arranged on the side wall of the buffer agitation tank, and the feed port is located at a height higher than the flow-aiding step.

[0010] As a further improvement of the present invention, the resistance increasing blade is arranged at the material inlet end of the feed pipe, and the resistance increasing blade is spherical, and a rotating shaft is arranged at the center.

[0011] As a further improvement of the present invention, the rotating shaft of the resistance increasing blade is connected to the stirring structure through a transmission rod.

[0012] The stirring structure includes a stirring central shaft connected to the transmission rod and extending into the interior of the buffer stirring tank, and a stirring blade arranged on the stirring central shaft.

[0013] As a further improvement of the present invention, the deep well delivery pipeline pressure relief and slurry stirring device also includes a motor connected to the stirring structure.

[0014] As a further improvement of the present invention, a discharge port connecting the discharge pipe and the interior of the cache stirring tank is also provided on the side wall of the cache stirring tank; the discharge port is provided at the lower part of the side wall.

[0015] The present invention also provides a deep well conveying pipeline pressure relief and slurry stirring process, which uses the above-mentioned deep well conveying pipeline pressure relief and slurry stirring device to perform operations, including the following steps: a high-concentration paste filling slurry flows from a feed pipe through a flow-aiding step into a buffer stirring tank, and the resistance-increasing blades in the feed pipe drive the stirring center axis and stirring blades of the stirring structure to rotate under the action of the gravity of the slurry, thereby stirring the slurry in the buffer stirring tank, and the stirred paste filling slurry flows out from a discharge pipe.

[0016] The beneficial effects of the present invention are:

[0017] 1. The present invention provides a deep well delivery pipeline pressure relief and slurry stirring device, comprising a buffer stirring tank, a feed pipe and a discharge pipe connected to the buffer stirring tank; a flow-aiding step and a stirring structure are arranged inside the buffer stirring tank, and the stirring structure is arranged in the horizontal direction; a resistance-increasing blade is arranged inside the feed pipe. The present invention increases the residence time of the slurry in the tank body, enhances the stirring effect of the stirring structure, and prevents the segregation of the slurry.

[0018] 2. The resistance-increasing blades provided in the present invention can utilize the gravitational potential energy of the slurry, which saves resource loss on the one hand and relieves pressure on the other hand. The slurry is stirred again while the pressure is relieved and the speed is reduced, which can effectively avoid segregation and sedimentation during long-distance transportation, eliminate the vacuum section that is easily generated during vertical transportation, and reduce pipe burst accidents caused by sudden increases in pipe pressure.

[0019] 3. Compared with the traditional manifold pressure relief and pressure relief valve pressure relief, the single pressure relief intensity of the present invention is large and the slurry flow rate reduction effect is good. A single pressure relief can replace the original multiple pressure reliefs, reducing the transportation process nodes and improving the transportation reliability.

[0020] 4. The present invention has a simple structure, no precision structure, and is durable. It uses a large space to release pressure to replace the traditional pressure relief in the pipe, which greatly reduces the wear of the pressure relief point of the pipeline, and does not require sensors and valve devices, reducing the number of spare parts. When the pipe is blocked during transportation, it can serve as an accident pool to reduce the pollution of slurry in the well. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A general view of the deep well delivery pipeline pressure relief and slurry stirring device provided by the present invention.

[0022] Figure 2 A top view of the deep well delivery pipeline pressure relief and slurry stirring device provided by the present invention.

[0023] Figure 3 This is an axial cross-sectional view of the deep well delivery pipeline pressure relief and slurry stirring device provided by the present invention.

[0024] Figure 4 A side view of the deep well delivery pipeline pressure relief and slurry stirring device provided by the present invention.

[0025] Figure 5 This is the front view of the drag-increasing blade.

[0026] Figure 6 A side view of the drag-enhancing blade.

[0027] Reference numerals

[0028] 1-buffer stirring tank; 11-flow-aiding step; 12-stirring structure; 121-stirring center axis; 122-stirring blade; 2-feed pipe; 21-feed port; 3-discharge pipe; 31-discharge port; 4-resistance-increasing blade; 41-arc blade; 42-rotating shaft; 5-transmission rod. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] It should also be noted that, in order to avoid obscuring the present invention due to unnecessary details, only structures and / or processing steps closely related to the scheme of the present invention are shown in the drawings, while other details that are not closely related to the present invention are omitted.

[0031] In addition, it should be noted that the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0032] See also Figures 1 to 6 As shown, the present invention provides a deep well conveying pipeline pressure relief and slurry stirring device, including a buffer stirring tank 1, a feed pipe 2 and a discharge pipe 3 connected to the buffer stirring tank 1; the interior of the buffer stirring tank 1 is provided with a flow-aiding step 11 and a stirring structure 12; the stirring structure 12 is arranged in the horizontal direction; and a resistance-increasing blade 4 is provided in the feed pipe 2.

[0033] The flow-aiding step 11 extends along the inner wall of the buffer stirring tank 1 to the bottom, leaving a certain space with the inner wall on the other side to facilitate the installation of the stirring structure 12; the number of steps of the flow-aiding step 11 is ≥3, which can increase the residence time of the slurry in the tank body, improve the pressure relief effect, and enhance the stirring effect of the stirring structure 12. At the same time, the setting of the flow-aiding step 11 also reduces the footprint of the pressure relief device.

[0034] The feed pipe 2 is arranged in a U shape, and a feed port 21 is arranged on the side wall of the buffer stirring tank 1 to connect the feed pipe 2 with the inside of the buffer stirring tank 1, and the position height of the feed port 21 is higher than the flow-aiding step 11. The feed pipe 2 is fixed to the side wall of the buffer stirring tank 1 through a U-shaped fixing bracket. A discharge port 31 is also arranged on the side wall of the buffer stirring tank 1 to connect the discharge pipe 3 with the inside of the buffer stirring tank 1; the discharge port 31 is arranged at the lower part of the side wall.

[0035] In some embodiments of the present invention, the feed pipe 2 and the discharge pipe 3 are arranged on the same side of the buffer stirring tank 1 .

[0036] The resistance increasing blade 4 is arranged at the inlet end of the feed pipe 2 , and the resistance increasing blade 4 is spherical, and is composed of a plurality of arc-shaped blades 41 , and a rotating shaft 42 is arranged at the center. The rotating shaft 42 is connected to the stirring structure 12 through a transmission rod 5 .

[0037] The stirring structure 12 is arranged at the bottom of the buffer stirring tank 1 to facilitate the full stirring of the slurry. The stirring structure 12 includes a stirring center axis 121 and a stirring blade 122 arranged on the stirring center axis 121. When the high-concentration paste filling slurry enters the feed pipe 2, the gravity potential energy brought by the height drives the resistance increasing blade 4 to rotate, so that the gravity potential energy is converted into mechanical energy for the rotation of the resistance increasing blade 4. The resistance increasing blade 4 drives the stirring structure 12 to rotate, and the slurry in the buffer stirring tank 1 is re-stirred. On the one hand, it saves resource loss, and on the other hand, it relieves pressure. The slurry is stirred again while the pressure is relieved and the speed is reduced, which can effectively avoid the phenomenon of segregation and sedimentation during long-distance transportation, eliminate the vacuum section that is easy to produce during vertical transportation, and reduce the pipe burst accidents caused by the sudden increase of pipe pressure.

[0038] In some embodiments of the present invention, a motor connected to the stirring structure 12 is also provided. When the unpowered stirring driven by the slurry's own weight cannot meet the stirring requirements of the high-concentration slurry in the tank body, the motor can be started to mechanically drive the stirring structure 12 to rotate for collaborative operation.

[0039] The deep well conveying pipeline pressure relief and slurry stirring device provided by the present invention can remove the stirring structure 12 when a pipe blocking accident occurs, and use the buffer stirring tank 1 as an accident pool to reduce underground slurry pollution.

[0040] The pressure relief and stirring process of the above-mentioned deep well conveying pipeline pressure relief and slurry stirring device includes the following steps: a high-concentration paste filling slurry flows from the feed pipe 2 through the flow-aiding step 11 into the buffer stirring tank 1, and the resistance-increasing blade 4 in the feed pipe 2 drives the stirring center axis 121 and the stirring blade 122 to rotate under the action of the gravity of the slurry, thereby re-stirring the slurry in the buffer stirring tank 1, and the stirred paste filling slurry flows out from the discharge pipe 3.

[0041] It should be noted that the present invention utilizes the high pressure provided by the vertical pipeline to drive the stirring device to operate. According to the actual conveying flow rate and the pressure difference, the number of the resistance-increasing blades 4 and the stirring structure 12 can be adjusted, so as to achieve the effect of deep well conveying pressure relief and prevention of slurry segregation and sedimentation, which all fall within the protection scope of the present invention.

[0042] In summary, the deep well conveying pipeline pressure relief and slurry stirring device provided by the present invention increases the residence time of the slurry in the tank body, enhances the stirring effect, and prevents the slurry from segregating. Compared with the traditional manifold pressure relief and pressure relief valve pressure relief, the single pressure relief strength of the present invention is large and the slurry flow rate reduction effect is good. A single pressure relief can replace the original multiple pressure reliefs, reducing the conveying process nodes and improving the conveying reliability.

[0043] The above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention.

Claims

1. A deep well pipeline pressure relief and slurry stirring device, characterized in that: It comprises a buffer stirring tank, a feed pipe and a discharge pipe connected to the buffer stirring tank; a flow-aiding step and a stirring structure are arranged inside the buffer stirring tank; the stirring structure is arranged in a horizontal direction; and a resistance-increasing blade is arranged inside the feed pipe.

2. The deep well pipeline pressure relief and slurry stirring device according to claim 1 is characterized in that: The flow-aiding step extends along the inner wall of the cache stirring tank to the bottom, and the number of the flow-aiding step is ≥3.

3. The deep well pipeline pressure relief and slurry stirring device according to claim 1 is characterized in that: The feeding pipe is arranged in a U shape.

4. The deep well pipeline pressure relief and slurry stirring device according to claim 3 is characterized in that: A feed port communicating with the feed pipe and the interior of the buffer agitation tank is arranged on the side wall of the buffer agitation tank, and the feed port is located at a height higher than the flow-aiding step.

5. The deep well pipeline pressure relief and slurry stirring device according to claim 1 is characterized in that: The resistance increasing blade is arranged at the material inlet end of the feeding pipe, and the resistance increasing blade is spherical, and a rotating shaft is arranged at the center.

6. The deep well pipeline pressure relief and slurry stirring device according to claim 5 is characterized in that: The rotating shaft of the resistance increasing blade is connected to the stirring structure through a transmission rod.

7. The deep well pipeline pressure relief and slurry stirring device according to claim 6 is characterized in that: The stirring structure includes a stirring central shaft connected to the transmission rod and extending into the interior of the buffer stirring tank, and a stirring blade arranged on the stirring central shaft.

8. The deep well pipeline pressure relief and slurry stirring device according to claim 1 is characterized in that: The deep well delivery pipeline pressure relief and slurry stirring device also includes a motor connected to the stirring structure.

9. The deep well pipeline pressure relief and slurry stirring device according to claim 4, characterized in that: A discharge port communicating with the discharge pipe and the interior of the cache stirring tank is also provided on the side wall of the cache stirring tank; the discharge port is provided at the lower part of the side wall.

10. A deep well pipeline pressure relief and slurry stirring process, using the deep well pipeline pressure relief and slurry stirring device according to any one of claims 1 to 9 for operation, characterized in that: The following steps are involved: High-concentration paste filling slurry flows from the feed pipe through the flow-aiding step into the buffer stirring tank. The resistance-increasing blades in the feed pipe drive the stirring center axis and stirring blades of the stirring structure to rotate under the action of the gravity of the slurry, thereby re-stirring the slurry in the buffer stirring tank. The stirred paste filling slurry flows out from the discharge pipe.

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