Paste deep well conveying system and control method

Abstract

The invention discloses a paste deep well conveying system and a control method, and relates to the technical field of paste screening and filling. The paste deep well conveying system comprises a paste preparation mechanism, at least two first conveying pipes, an anti-attrition pipeline and a second conveying pipe, the at least two first conveying pipes are vertically arranged and stacked, the bottom end of each first conveying pipe is sealed, a connector is formed in the side wall of the bottom end of each first conveying pipe, and the anti-attrition pipeline is connected with the second conveying pipe. The top end of the topmost first conveying pipe is connected with an output pipe of the paste preparation mechanism; the ends, close to each other, of every two adjacent first conveying pipes are connected through an anti-attrition pipeline, the second conveying pipes are transversely arranged, one end of each second conveying pipe is connected with the connector of the bottommost first conveying pipe, and the other ends of the second conveying pipes are arranged in a to-be-filled area. In the using process, the multiple conveying pipes with the sealed bottom ends are arranged, gravitational potential energy of paste conveyed from the earth surface to a goaf can be buffered in a segmented mode, and the situation that the paste abrades or breaks down the pipeline wall due to the fact that the gravitational potential energy is increased is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of paste filling, and in particular to a paste deep well conveying system and a control method. Background Art

[0002] There have always been problems with production safety and environmental protection in non-coal mining. After the ore is mined, there will be goafs left. The rock mass above the goaf will collapse easily after losing support, causing casualties and property losses. At the same time, solid waste will remain after the metal is extracted from the ore, and directly abandoning it on the surface will pollute the environment. Through paste filling technology, this part of solid waste is crushed and mixed with gelling agents and other materials to form a paste fluid, which is then filled into the goaf. After the paste solidifies, it supports the rock mass above the goaf. At the same time, the waste after ore mining is backfilled underground to avoid polluting the surface environment.

[0003] Among them, safe gravity transportation of paste is the key link of filling technology. The surface paste is transported to the goaf through pipelines. As the depth of the mine increases, the height difference between the surface and the goaf increases, which makes the gravitational potential energy of the paste in the process of transportation increasingly larger. The impact and wear of the paste on the pipeline wall also gradually increase. The pipeline wall is easily worn through, resulting in leakage of the paste. Summary of the invention

[0004] The main purpose of the present invention is to provide a paste deep well conveying system and a control method, aiming to solve or partially solve the above-mentioned technical problems.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A paste deep well conveying system, comprising:

[0007] Paste preparation mechanism;

[0008] At least two first conveying tubes are arranged upright and stacked vertically, the bottom end of each first conveying tube is sealed to buffer the vertical impact of the conveyed paste, the side wall of the bottom end of each first conveying tube is provided with an interface, and the top end of the topmost first conveying tube is connected to the output pipe of the paste preparation mechanism;

[0009] A friction-reducing pipeline connecting two adjacent first delivery pipes at ends close to each other;

[0010] A second conveying pipe is arranged horizontally, one end of which is connected to the interface of the first conveying pipe at the bottom of the deep well, and the other end of which is arranged in the area to be filled.

[0011] As a further improvement of the present invention, the friction-reducing pipeline includes a first conduit and a second conduit arranged horizontally, and a third conduit respectively connected to one end of the first conduit and the second conduit, the end of the first conduit away from the third conduit is connected to the interface of the first output pipe at a high position, the end of the second conduit away from the third conduit is sealed, and the side wall of the sealed end of the second conduit is provided with an interface and connected to the top end of the first output pipe at a low position.

[0012] As a further improvement of the present invention, a first preset distance is provided between the sealed end of the first delivery tube and the first conduit connected thereto so that the sealed end of the first delivery tube accumulates the paste, and a second preset distance is provided between the top end of the first delivery tube and the sealed end of the second conduit connected thereto so that the sealed end of the second conduit accumulates the paste.

[0013] As a further improvement of the present invention, the friction reducing pipeline also includes an electrically controlled valve, which is arranged on the first conduit. The electrically controlled valve changes its opening to change the pipeline pressure of the second conduit, the third conduit, and the first delivery pipe at a low position.

[0014] As a further improvement of the present invention, the output pipe of the paste preparation mechanism is provided with a first pressure sensor to detect the pipeline pressure of the output pipe of the paste preparation mechanism, and the second output pipe is provided with a second pressure sensor to detect the pipeline pressure of the second output pipe.

[0015] As a further improvement of the present invention, the paste deep well delivery system further comprises a central control mechanism electrically connected to the paste preparation mechanism, each electrically controlled valve, the first pressure sensor and the second pressure sensor respectively. The central control mechanism pre-stores a number of control instructions, receives signals from the first pressure sensor and the second pressure sensor, and matches corresponding control instructions to respectively control and adjust the output of the paste preparation mechanism and the opening of each electrically controlled valve.

[0016] A control method for a paste deep well conveying system comprises the following steps:

[0017] Acquire a first current pressure value collected by a first pressure sensor, a second current pressure value collected by a second pressure sensor, and an expected pressure value interval corresponding to each opening of the electric-controlled valve; wherein the first current pressure value represents the pipeline pressure at the input end of the paste deep-well transportation system, and the second current pressure value represents the pipeline pressure at the output end of the paste deep-well transportation system;

[0018] When it is detected that the first current pressure value is greater than a first preset pressure threshold, the output of the paste preparation mechanism is controlled to be reduced, and when it is detected that the first current pressure value is less than a second preset pressure threshold, the output of the paste preparation mechanism is controlled to be increased;

[0019] According to the expected pressure value intervals corresponding to the openings of the electronically controlled valve, the opening corresponding to the expected pressure value interval to which the second current pressure value corresponding to the preset multiple belongs is determined as the target opening of the electronically controlled valve;

[0020] Each electronically controlled valve is controlled to adjust its opening to the target opening.

[0021] As a further improvement of the present invention, the first preset pressure threshold is greater than the second preset pressure threshold, the first preset pressure threshold is not less than the maximum pressure-bearing value of each pipeline of the paste deep well transportation system, and the second preset pressure threshold is not less than the pipeline pressure when each transportation pipe of the paste deep well transportation system is full and the paste is stationary.

[0022] As a further improvement of the present invention, the preset multiple is determined by the number of friction-reducing pipelines of the paste deep well transportation system.

[0023] The technical solution provided by the present invention may include the following beneficial effects:

[0024] During use of the present invention, the paste output by the paste preparation mechanism is transported to the underground goaf through a pipeline composed of a first conveying pipe, a friction-reducing pipeline and a second conveying pipe, and the rock mass at the top of the goaf is supported after the paste solidifies; a plurality of conveying pipes with sealed bottom ends are provided, which can buffer the gravitational potential energy of the paste transported from the surface to the goaf in sections, thereby preventing the paste from being worn or piercing the pipeline wall due to the increase in gravitational potential energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, wherein like reference numerals generally represent like components throughout the exemplary embodiments of the present invention.

[0026] Figure 1 It is a structural schematic diagram of a paste deep well delivery system;

[0027] Reference numerals:

[0028] 100, deep well; 200, goaf connecting tunnel; 300, well-tunnel connecting tunnel;

[0029] 1. Paste preparation mechanism; 2. First delivery pipe; 3. Friction reduction pipeline; 31. First conduit; 32. Second conduit; 33. Third conduit; 34. Electric control valve; 4. Second delivery pipe; 5. First pressure sensor; 6. Second pressure sensor. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. In the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present invention.

[0031] Paste deep well delivery system

[0032] Figure 1 An embodiment of a paste deep well delivery system of the present invention is shown, see Figure 1 The paste deep well delivery system is used for paste filling operations in underground goafs. A deep well 100 connected to the surface is set at a location far away from the goaf. The goaf is connected to the bottom of the deep well 100 through a goaf connection tunnel 200. A well-tunnel connection tunnel 300 is set at each preset depth on one side of the deep well 100. The paste deep well delivery system includes: a paste preparation mechanism 1, a first delivery pipe 2, a friction reduction pipeline 3 and a second delivery pipe 4.

[0033] Among them, see Figure 1 , a paste preparation mechanism 1 is arranged on the surface of the mouth of a deep well 100 to process the solid waste remaining after the metal is extracted from the ore into a paste fluid and output it; the deep well 100 is arranged with at least two upright first conveying pipes 2 along its depth, and the bottom end of each first conveying pipe 2 is sealed to buffer the vertical impact force of the conveyed paste, and the side wall of the bottom end of each first conveying pipe 2 is provided with an interface, and the top of the topmost first conveying pipe 2 is connected to the output pipe of the paste preparation mechanism 1; the ends of each adjacent two first conveying pipes 2 close to each other are connected by a friction-reducing pipeline 3, and the friction-reducing pipeline 3 is arranged in a shaft-tunnel connecting tunnel 300; a second conveying pipe 4 is horizontally arranged in a goaf connecting tunnel 200, one end of the second conveying pipe 4 is connected to the interface of the first conveying pipe 2 at the bottom of the deep well 100, and the other end of the second conveying pipe 4 is arranged in the goaf. The paste output by the paste preparation mechanism 1 is transported to the underground goaf through the pipeline composed of the first delivery pipe 2, the friction reduction pipeline 3 and the second delivery pipe 4, so as to support the rock mass above the goaf after the paste solidifies. During the transportation of the paste deep well 100, the gravitational potential energy increases with the increase of the height difference, and the impact and wear of the paste on the pipeline wall also gradually increase. The bottom end of each first delivery pipe 2 is sealed, which can offset most of the gravitational potential energy during the transportation of the paste deep well 100 in sections, avoiding the pipeline wall from being punctured or worn through, and causing the paste to leak out.

[0034] It should be noted that this embodiment focuses on the working principle of the paste preparation mechanism 1. The paste preparation mechanism 1 is not the focus of this embodiment. The installation position or area of ​​the paste preparation mechanism 1 has been illustrated, and the specific structure of the paste preparation mechanism 1 will not be repeated.

[0035] Further, see Figure 1 The friction-reducing pipeline 3 includes a first conduit 31, a second conduit 32 and a third conduit 33. The first conduit 31 and the second conduit 32 are horizontally arranged and vertically stacked in the wellbore communication tunnel. The two ends of the third conduit 33 are respectively connected to the ends of the first conduit 31 and the second conduit 32 away from the deep well 100. The end of the first conduit 31 away from the third conduit 33 is connected to the interface of the first conveying pipe 2 at a high position. The end of the second conduit 32 away from the third conduit 33 is sealed. The side wall of the sealed end of the second conduit 32 is provided with an interface and is connected to the top of the first conveying pipe 2 at a low position. A U-shaped loop is formed by the first conduit 31, the second conduit 32 and the third conduit 33, so that the sealed end of the first conveying pipe 2 offsets the gravitational potential energy of the paste while connecting two adjacent first conveying pipes 2.

[0036] Further, see Figure 1 A first preset distance is provided between the sealed end of the first delivery tube 2 and its interface, so that a certain amount of paste can be accumulated at the sealed end of the first delivery tube 2 to prevent the falling paste from directly hitting the sealed end of the first delivery tube 2 and causing the sealed end of the first delivery tube 2 to be worn or punctured. At the same time, the first conduit 31 is located on the side of the first delivery tube 2 adjacent to the electric control valve 34 so that the paste can be fully transported.

[0037] Further, see Figure 1 A second preset distance is provided between the sealed end of the second conduit 32 and its interface, so that a certain amount of paste can be accumulated at the sealed end of the second conduit 32, thereby preventing the delivered paste from directly hitting the sealed end of the second conduit 32, thereby causing the sealed end of the second conduit 32 to be worn or punctured.

[0038] Optionally, the first preset distance is not less than 50 cm, and the second preset distance is not less than 30 cm.

[0039] Optionally, the first delivery pipe 2 and the second conduit 32 are both formed by connecting one end of a straight pipe to a right-angle tee.

[0040] Optionally, the paste deep well delivery system provided in this embodiment is preferably provided with a first delivery pipe 2 every 40-50m along the depth of the deep well 100. Accordingly, a shaft connection tunnel is provided every 40-50m on one side of the deep well 100 to provide a friction reducing pipeline 3.

[0041] Further, see Figure 1The friction-reducing pipeline 3 also includes an electric control valve 34, which is installed on the first conduit 31. The electric control valve 34 changes its opening, which can change the pipeline pressure at the front end of the electric control valve 34, reduce the paste's wear on the pipeline wall, and continuously transport the paste. When the pressure at the rear end of the electric control valve 34 is relatively high, the flow rate of the transported paste is also relatively high, and the wear of the particles in the paste on the pipeline wall is also relatively high. By controlling to increase the opening of the electric control valve 34, the pipeline pressure at the front end of the electric control valve 34 can be reduced, and the flow rate of the transported paste will also be reduced accordingly, and the wear of the particles in the paste on the pipeline will also be reduced; when the pressure at the rear end of the electric control valve 34 is relatively low, the flow rate of the transported paste is also relatively low, and the paste is easy to accumulate in the transport pipeline. By controlling to reduce the opening of the electric control valve 34, the pipeline pressure at the front end of the electric control valve 34 can be increased, and the flow rate of the transported paste will also increase accordingly, ensuring that the paste will not accumulate in the pipeline during the transportation process.

[0042] Further, see Figure 1 The paste deep well delivery system also includes a first pressure sensor 5 and a second pressure sensor 6. The first pressure sensor 5 is arranged on the output pipe of the paste preparation mechanism 1, and is used to detect the pipeline pressure of the output pipe of the paste preparation mechanism 1, as the pipeline pressure at the input end of the paste deep well delivery system, and the output of the paste preparation mechanism 1 is adjusted by this value; the second pressure sensor 6 is arranged on the second delivery pipe 4, and is used to detect the pipeline pressure of the second delivery pipe 4, as the pipeline pressure at the output end of the paste deep well delivery system, and the opening of each electric control valve 34 is adjusted by this value.

[0043] Furthermore, the paste deep well delivery system also includes a central control mechanism electrically connected to the paste preparation mechanism 1, each electric control valve 34, the first pressure sensor 5 and the second pressure sensor 6. The central control mechanism pre-stores a number of control instructions, receives signals from the first pressure sensor 5 and the second pressure sensor 6, and matches corresponding control instructions to control and adjust the output of the paste preparation mechanism 1 and the opening of each electric control valve 34 respectively.

[0044] It should be noted that this embodiment focuses on the control principle of the central control mechanism, and the specific structure of the central control mechanism is not the focus of this embodiment, and is a prior art, and this embodiment will not repeat the specific structure of the central control mechanism. Similarly, this embodiment focuses on the working principle of the electric control valve 34, the first pressure sensor 5, and the second pressure sensor 6, and the specific structure of the electric control valve 34, the first pressure sensor 5, and the second pressure sensor 6 is not the focus of this embodiment, and is a prior art. This embodiment and the accompanying drawings have given the installation position or area of ​​the electric control valve 34, the first pressure sensor 5, and the second pressure sensor 6, and the specific structure of the electric control valve 34, the first pressure sensor 5, and the second pressure sensor 6 will not be repeated.

[0045] In this embodiment, the paste output by the paste preparation mechanism 1 is transported to the underground goaf through a pipeline composed of a first conveying pipe 2, a friction-reducing pipeline 3 and a second conveying pipe 4, and the rock mass at the top of the goaf is supported after the paste solidifies; a plurality of conveying pipes with sealed bottom ends are provided to buffer the gravitational potential energy of the paste transported from the surface to the goaf in sections, thereby preventing the paste from being worn or piercing the pipe wall due to the increase in gravitational potential energy; an additional friction-reducing pipeline 3 is provided between each two adjacent first conveying pipes 2 to meet the needs of multi-section buffering of the paste impact while ensuring that the paste transported by the high-position first conveying pipe 2 can be transferred to the low-position first conveying pipe 2; the opening of the electrically controlled valve 34 provided in the friction-reducing pipeline 3 is controlled to change the flow rate of the lateral conveying of the paste. In this way, the flow rate of the conveyed paste can be reduced to reduce the wear of the pipe wall by particles in the paste, while allowing the paste in the pipe to flow continuously to avoid the accumulation of the paste in the pipe due to too low a flow rate.

[0046] Control method of paste deep well conveying system

[0047] Figure 1 An embodiment of a control method of a paste deep well delivery system of the present invention is shown, which is applied to the paste deep well delivery system provided in the above embodiment. The control method includes:

[0048] Obtain the first current pressure collected by the first pressure sensor 5, the second current pressure collected by the second pressure sensor 6, and the expected pressure value interval corresponding to each opening of each electronically controlled valve 34; wherein the first current pressure represents the pipeline pressure at the input end of the paste deep well transportation system, and the second current pressure value represents the pipeline pressure at the output end of the paste deep well transportation system;

[0049] When it is detected that the first current pressure value is greater than the first preset pressure threshold, the output of the paste preparation mechanism 1 is controlled to be reduced, and when it is detected that the first current pressure value is less than the second preset pressure threshold, the output of the paste preparation mechanism 1 is controlled to be increased;

[0050] According to the expected pressure value intervals corresponding to the openings of the electric-controlled valve 34, the opening corresponding to the expected pressure interval corresponding to the second current pressure value of the preset multiple is determined as the target opening of the electric-controlled valve 34;

[0051] Each electrically controlled valve 34 is controlled to adjust its opening to a target opening.

[0052] Furthermore, the first preset pressure threshold is greater than the second preset pressure threshold, and the first preset pressure threshold is not less than the maximum pressure value of each pipeline of the paste deep well transportation system, so as to avoid the output paste amount exceeding the pressure limit of each pipeline, resulting in pipe burst or leakage; the second preset pressure threshold is not lower than the pipeline pressure when each transportation pipe of the paste deep well transportation system is full and the paste is stationary, so as to avoid insufficient amount of paste transported, resulting in insufficient pressure in the pipeline, and causing pipe blockage caused by paste retention.

[0053] Furthermore, the preset multiple is determined according to the number of additional anti-friction pipelines 3, which is 1 / N, where N is the number of anti-friction pipelines 3. If the pressure at the output end of the paste deep well transportation system is on the rise, it means that the pressure inside the pipeline is relatively large, and the opening of each valve is controlled to increase to reduce the flow rate of the paste, thereby reducing the wear of the particles in the paste on the pipeline wall; if the pressure at the output end of the paste deep well transportation system is on the decline, it means that the pressure inside the pipeline is relatively small, and the opening of each valve is controlled to decrease to increase the flow rate of the paste, thereby avoiding excessive paste from being retained in the pipeline and causing pipe blockage.

[0054] For example, it is necessary to carry out paste filling operation in the goaf of a mine at a depth of about 140m underground, and two sets of friction-reducing pipelines 3 are added. The openings of the electric control valves 34 set in the friction-reducing pipelines 3 are respectively set to 10°, 25°, 35°, 40°, 55°, 70°, 85°, 90° and 100°, and the corresponding expected pressure value intervals are 0~0.5Mpa, 0.5~1Mpa, 1~1.5Mpa, 1.5~2Mpa, 2~2.5Mpa, 2.5~3Mpa, 3~3.5Mpa, 3.5~4Mpa, 4~4.5Mpa. The preset multiple is 1 / 2, and the value of the second current pressure value detected by the second pressure sensor 6 multiplied by the preset multiple is compared with the expected pressure value interval, and the valve opening corresponding to the pressure value interval is the target opening of each valve.

[0055] In this embodiment, the pressure of the input and output ends of the paste deep well transportation system are monitored respectively, and the output volume of the paste preparation mechanism 1 is adjusted by the pressure detection value of the input end to prevent the pipeline from being over-pressurized and causing pipe burst or leakage, and to avoid pipe blockage caused by insufficient internal pressure in the pipeline; at the same time, the opening of each electrically controlled valve 34 is adjusted by the pressure detection value of the output end to change the pipeline pressure at the front and rear ends of each valve, to avoid excessive internal pressure in the pipeline that increases the paste flow rate, thereby increasing the wear of the pipeline by particles in the paste, and at the same time, to avoid pipe blockage caused by paste retention due to low internal pressure in the pipeline or cessation of flow of the paste.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A paste deep well delivery system, characterized in that: include: Paste preparation mechanism; At least two first conveying tubes are arranged upright and stacked vertically, the bottom end of each first conveying tube is sealed to buffer the vertical impact of the conveyed paste, the side wall of the bottom end of each first conveying tube is provided with an interface, and the top end of the topmost first conveying tube is connected to the output pipe of the paste preparation mechanism; A friction-reducing pipeline connecting two adjacent first delivery pipes at ends close to each other; A second conveying pipe is arranged horizontally, one end of the second conveying pipe is connected to the interface of the first conveying pipe at the bottom, and the other end of the second conveying pipe is arranged in the area to be filled.

2. The paste deep well delivery system according to claim 1, characterized in that: The friction-reducing pipeline includes a first conduit and a second conduit arranged horizontally, and a third conduit respectively connected to one end of the first conduit and the second conduit, the end of the first conduit away from the third conduit is connected to the interface of the first output pipe at a high position, the end of the second conduit away from the third conduit is sealed, and the side wall of the sealed end of the second conduit is provided with an interface and connected to the top end of the first output pipe at a low position.

3. The paste deep well delivery system according to claim 2, characterized in that: There is a first preset distance between the sealed end of the first delivery tube and the first conduit connected thereto so that the sealed end of the first delivery tube accumulates paste, and there is a second preset distance between the top end of the first delivery tube and the sealed end of the second conduit connected thereto so that the sealed end of the second conduit accumulates paste.

4. The paste deep well delivery system according to claim 3, characterized in that: The friction reduction pipeline further comprises an electrically controlled valve, which is arranged on the first conduit and changes its opening to change the pipeline pressure of the second conduit, the third conduit and the first delivery pipe at a low position.

5. The paste deep well delivery system according to claim 1, characterized in that: The output pipe of the paste preparation mechanism is provided with a first pressure sensor to detect the pipeline pressure of the output pipe of the paste preparation mechanism, and the second output pipe is provided with a second pressure sensor to detect the pipeline pressure of the second output pipe.

6. A control method for a paste deep well delivery system, characterized in that: Applicable to the paste deep well delivery system according to any one of claims 1 to 5, the control method comprises: Acquire a first current pressure value collected by a first pressure sensor, a second current pressure value collected by a second pressure sensor, and an expected pressure value interval corresponding to each opening of the electric-controlled valve; wherein the first current pressure value represents the pipeline pressure at the input end of the paste deep-well transportation system, and the second current pressure value represents the pipeline pressure at the output end of the paste deep-well transportation system; When it is detected that the first current pressure value is greater than a first preset pressure threshold, the output of the paste preparation mechanism is controlled to be reduced, and when it is detected that the first current pressure value is less than a second preset pressure threshold, the output of the paste preparation mechanism is controlled to be increased; According to the expected pressure value intervals corresponding to the openings of the electronically controlled valve, the opening corresponding to the expected pressure value interval to which the second current pressure value corresponding to the preset multiple belongs is determined as the target opening of the electronically controlled valve; Each electronically controlled valve is controlled to adjust its opening to the target opening.

7. The control method according to claim 6, characterized in that: The first preset pressure threshold is greater than the second preset pressure threshold, the first preset pressure threshold is not less than the maximum pressure-bearing value of each pipeline of the paste deep well transportation system, and the second preset pressure threshold is not less than the pipeline pressure when each transportation pipe of the paste deep well transportation system is full and the paste is stationary.

8. The control method according to claim 6, characterized in that: The preset multiple is determined by the number of friction-reducing pipelines of the paste deep well transportation system.

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