Pipe system and method for preventing deposition of pipe bottom gas film fluidization for high water filling

Abstract

This application provides a bottom-mounted air-film fluidized bed anti-deposition pipeline system for high-water filling, belonging to the field of coal mine filling operations. It includes a conveying pipeline, branch pipe components, a fluidized bed, an air supply system, and an intelligent monitoring system. The branch pipe components are connected to the side wall of the conveying pipeline. The fluidized bed is installed inside the conveying pipeline, and the air supply system provides high-pressure air to the branch pipe components. The intelligent monitoring system includes a densitometer installed at the bottom of the conveying pipeline and a central controller used to control the air supply system and branch pipe components to adjust the air pressure and intake volume. This application, by constructing a basic air film at the bottom of the conveying pipeline, utilizes the fluidization and disturbance effects of the air film, along with differential pressure transmitters and densitometers spaced along the conveying pipeline. Through effective coordination between the central controller and each branch pipe component, it can achieve an automated, early prevention effect against slurry deposition inside the pipeline, solving the problem of pipeline blockage due to material accumulation during high-water filling operations in coal mines.

Description

Technical Field

[0001] This application relates to the field of coal mine filling and mining technology, specifically to a pipe bottom air film fluidization anti-deposition pipeline system and anti-deposition method for high water filling. Background Technology

[0002] Coal mine filling mining technology is a core technology that uses solid waste such as gangue and fly ash to fill underground goaf areas in order to control surface subsidence, improve resource recovery rate and achieve green mining.

[0003] During the backfilling construction of coal mine goaf areas, due to the extremely short initial setting time of high-water filling materials, the filling material is prone to rapid deposition, solidification, and clumping at the bottom of the main pipeline, which seriously affects the effective flow cross-section of the filling pipeline and ultimately leads to pipeline blockage.

[0004] Therefore, there is an urgent need for a "prevention" approach to completely solve this problem. Summary of the Invention

[0005] In view of the technical problems existing in the background art, this application provides a pipe bottom air film fluidization anti-deposition pipeline system and anti-deposition method for high water filling.

[0006] In a first aspect, embodiments of this application provide a bottom-pipe air-film fluidized bed anti-deposition pipeline system for high-water filling. The bottom-pipe air-film fluidized bed anti-deposition pipeline system includes a delivery pipeline and branch pipe assemblies. There are multiple sets of branch pipe assemblies, which are connected to the sidewall of the delivery pipeline. A fluidized bed is installed inside the delivery pipeline and has a micropore array that connects the branch pipe assemblies to the delivery pipeline. An air supply system is connected to the multiple sets of branch pipe assemblies and provides high-pressure air to the branch pipe assemblies. An intelligent monitoring system includes a densitometer installed at the bottom of the delivery pipeline and a central controller for controlling the air supply system and the branch pipe assemblies to adjust the air pressure and intake volume.

[0007] In some embodiments, there are multiple sets of densitometers, which are arranged at intervals along the length of the delivery pipeline.

[0008] In some embodiments, the intelligent monitoring system further includes differential pressure transmitters for monitoring pipeline pressure differentials; there are multiple sets of differential pressure transmitters, and the multiple sets of differential pressure transmitters are arranged at intervals along the length of the conveying pipeline.

[0009] In some embodiments, the fluidized bed is disposed at the bottom of the conveying pipeline, and / or the fluidized bed is installed along the length of the conveying pipeline.

[0010] In some embodiments, the micropore size in the fluidized bed is smaller than the minimum particle size of solid particles in the high-water material.

[0011] In some embodiments, the surface of the fluidized bed is a smooth surface, and the surface of the fluidized bed smoothly transitions to the inner wall of the conveying pipe.

[0012] In some embodiments, multiple sets of the branch pipe assemblies are arranged side by side along the length of the delivery pipe.

[0013] In some embodiments, each branch pipe assembly includes an air inlet branch pipe and a one-way valve, a flow meter, and a precision pressure regulating valve installed on the air inlet branch pipe; the flow meter monitors the air source flow data entering the delivery pipeline through the air inlet branch pipe in real time and transmits the monitored data to the central controller; the precision pressure regulating valve automatically adjusts the air source pressure and air supply volume delivered into the delivery pipeline through the air inlet branch pipe according to the instructions of the central controller.

[0014] In some embodiments, the air supply system includes an air compressor and a drying tank, the air inlet of the drying tank being connected to the air outlet of the air compressor; and a pressure stabilizing tank, the air inlet of which is connected to the air outlet of the drying tank via a main air inlet pipe, and the air outlet of the pressure stabilizing tank being connected to the air inlet branch pipe of a plurality of branch pipe assemblies.

[0015] In some embodiments, the gas supply system includes an air compressor, the air inlet of the pressure stabilizing tank is connected to the air outlet of the air compressor, the air outlet of the pressure stabilizing tank is connected to the air inlet of the drying tank, the air outlet of the drying tank is connected to a distribution pipe through a main air inlet pipe, and the air inlet branch pipes of the plurality of branch pipe assemblies are all connected to the distribution pipe.

[0016] The second aspect of this application provides a method for preventing sedimentation at the bottom of a pipe for high-water backfilling in coal mines. This method is applied to a high-water backfilling pipe bottom air-film fluidization anti-deposition pipeline system provided in the first aspect of this application. The specific steps are as follows: Step 1: Lay and install a high-water-filled anti-deposition pipeline system; Step 2: Before the filling operation begins, the central controller starts the air supply system and supplies air to the fluidized bed through the branch pipe assembly. A stable basic air film is established at the bottom of the conveying pipe. The pressure of the basic air film is higher than the static pressure of the slurry in the conveying pipe, and an air cushion layer with a thickness of 0.5-3 mm is formed on the fluidized bed. Step 3: The high-water material pumping equipment is started to pump high-water material into the conveying pipeline. During this process, the sensor monitors the material flow resistance and the density of the slurry at the bottom of the pipeline in real time and transmits the monitoring data back to the central controller. Step 4: The central controller automatically controls the gas supply pressure and flow rate of the branch pipe components in the corresponding node section based on the data transmitted back from the sensors installed at each node in the delivery pipeline.

[0017] This invention provides a pipe bottom air film fluidized bed anti-deposition pipeline system and method for high-water filling. By installing a fluidized bed along the length of the pipeline at the bottom and multiple sets of branch pipe assemblies along the entire pipeline, and cooperating with an air supply system that continuously provides air to the branch pipe assemblies, a stable basic air film can be built at the bottom of the pipeline. Utilizing the "lubricating" and "fluidizing" disturbance effect of the air film, solid particles in the high-water material cannot contact the bottom of the pipe, thus fundamentally preventing the formation of a deposition layer of high-water material in the pipeline. In addition, by combining multiple sets of differential pressure transmitters and densitometers arranged at intervals along the pipeline to monitor the internal pressure difference and the density data of the slurry bottom layer along the pipeline in real time, and by effectively cooperating between the central controller and the flow meters and precision pressure regulating valves in each branch pipe assembly, an automated early prevention effect on slurry deposition in the pipeline can be achieved. This can effectively extend the pipeline cleaning cycle and solve the problem of pipeline blockage due to material accumulation during high-water filling operations in coal mines.

[0018] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, specific embodiments of this application are given below. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of this application, the accompanying drawings used in this application will be briefly described below. Obviously, the drawings described below are merely some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without any creative effort.

[0020] Figure 1 This is a schematic diagram of the first embodiment of the high-water filling bottom air film fluidized anti-deposition pipeline system in this application. Figure 2 This is a schematic diagram of the branch pipe assembly in the high-water filling pipe bottom air film fluidization anti-deposition pipeline system in the embodiments of this application; Figure 3 This is a schematic diagram of the second embodiment of the high-water filling bottom air film fluidized anti-deposition pipeline system in this application. Figure 4 This is a schematic diagram of the process for preventing sedimentation at the bottom of a pipe in high-water backfilling in coal mines, as described in this application.

[0021] Explanation of reference numerals in the attached drawings: 1. Delivery pipeline; 2. Fluidized bed; 3. Branch pipe assembly; 301. Inlet branch pipe; 302. Check valve; 303. Flow meter; 304. Precision pressure regulating valve; 4. Air supply system; 401. Air compressor; 402. Dryer; 403. Main inlet pipe; 404. Pressure stabilizing tank; 405. Air distribution pipe; 5. Intelligent monitoring system; 501. Central controller; 502. Differential pressure transmitter; 503. Density meter; 6. Air cushion layer. Detailed Implementation

[0022] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0024] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0025] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0026] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0027] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0028] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0029] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0030] In coal mine goaf backfilling, high-moisture materials are typically mixed in two ways near the backfill area. The mixed high-moisture material has a short initial setting time. When transporting the high-moisture backfill material through pipelines, the working face is divided into zones, primarily using a main pipeline plus branch pipelines for diversion. This method results in varying flow velocities in the branch pipelines at different locations within the main pipeline, leading to different flow velocities of the high-moisture backfill material within the main pipeline. The closer to the tail end of the branch pipeline, the lower the flow velocity of the high-moisture backfill material within the main pipeline. When the settling velocity of solid particles exceeds the liquid velocity, the particles will inevitably migrate towards the bottom of the pipe and deposit under gravity. Traditional methods to address the problem of high-moisture materials easily depositing and clogging pipes during pipeline transport often involve periodically replacing the main pipeline. However, this method is not only inefficient and frequently disrupts normal backfilling operations, but it also fails to fundamentally eliminate the problem of material deposition and pipe clogging.

[0031] To address the technical problem of sedimentation and pipe blockage caused by high-water materials during the transportation of mixed materials in coal mine goaf backfilling, this application provides a pipe-bottom air-film fluidized bed anti-deposition pipeline system and method for high-water filling. By installing a fluidized bed along the length of the pipeline at the bottom and multiple sets of branch pipe assemblies along the entire pipeline, coupled with a continuous air supply system providing air to the branch pipe assemblies, a stable basic air film can be constructed at the bottom of the pipeline. Utilizing the "lubricating" and "fluidizing" disturbance effects of the air film, high-water filling can be effectively prevented from depositing and blocking the pipeline. Solid particles in the water-based material cannot contact the bottom of the pipe, thus preventing the formation of a sediment layer in the pipeline due to high water content. In addition, multiple sets of differential pressure transmitters and densitometers are arranged at intervals along the pipeline to monitor the internal pressure difference and the density of the slurry bottom layer in real time. With the effective cooperation between the central controller and the flow meters and precision pressure regulating valves in each branch pipe assembly, an automated preventive effect against slurry deposition in the pipeline can be achieved. This can effectively extend the pipeline cleaning cycle and solve the problem of pipeline blockage caused by material accumulation during high water filling operations in coal mines.

[0032] This embodiment provides a bottom-pipe air film fluidization anti-deposition pipeline system for high-water filling, such as... Figure 1 As shown, the bottom air-film fluidized bed anti-deposition pipeline system includes: a conveying pipeline 1, branch pipe assemblies 3, a fluidized bed 2, an air supply system 4, and an intelligent monitoring system 5. There are multiple sets of branch pipe assemblies 3, and these sets are connected to the sidewalls of the conveying pipeline 1. The fluidized bed 2 is installed inside the conveying pipeline 1 and has a micropore array, which connects the branch pipe assemblies 3 to the conveying pipeline 1. The air supply system 4 is connected to the multiple sets of branch pipe assemblies 3 and provides high-pressure air to them. The high-pressure air enters the conveying pipeline 1 through the branch pipe assemblies 3 and then permeates through the micropore array on the fluidized bed 2, forming an air cushion layer 6 composed of an air film on the surface of the fluidized bed 2. This layer isolates the high-water material inside the pipeline from contact with the bottom of the pipe, providing a "lubricating" and "fluidizing" disturbance effect, thereby preventing the deposition of high-water material.

[0033] The intelligent monitoring system 5 includes a densitometer 503 installed at the bottom of the conveying pipeline 1, and a central controller 501 used to control the gas supply system 4 and the branch pipe assembly 3 to adjust the gas pressure and air intake. The densitometer 503 is installed in the middle of the conveying pipeline 1 and close to the fluidized bed 2 by a bracket. It monitors the density change of the high water slurry near the bottom of the pipeline in real time and feeds the monitoring data back to the central controller 501. The central controller 501 judges the state of the slurry at the bottom of the pipeline based on the data fed back by the densitometer 503, and at the same time controls the branch pipe assembly 3 at the corresponding position to adjust the air intake of the gas source, automatically optimizing the gas film fluidization disturbance effect, thereby achieving the purpose of automated anti-deposition. It should be noted that, for the commonly used external non-contact sensors for monitoring slurry density, the proposed solution in this embodiment has a fluidized bed 2 installed inside the pipe, and a gas film fluidized layer is generated inside the pipe through the branch pipe assembly 3 and the gas supply system 4. Therefore, conventional external sensors (such as ultrasonic concentration monitoring sensors, Doppler flow velocity profile monitoring sensors, pipe ring electrode array sensors, and pipe wall acoustic / vibration sensors, etc.) are affected by the interference of the gas film fluidized layer, resulting in data distortion. Therefore, this embodiment uses a contact-type built-in density sensor, namely the density meter 503, which is directly installed inside the pipe and in direct contact with the slurry, which is beneficial for more accurate monitoring of the slurry density at the bottom of the pipe.

[0034] Optionally, the fluidized bed 2 is a stainless steel microporous plate, a microporous breathable belt made of sintered metal powder, or a ceramic-based polymer breathable membrane, and the width of the fluidized bed 2 is 1 / 4 to 1 / 3 of the pipe circumference.

[0035] Optionally, in order to reduce the excessive resistance to the flow of slurry inside the pipeline caused by the installation of the densitometer 503, a flat tripod is used to install the densitometer 503. It is installed at the bottom of the conveying pipeline 1 along the length of the conveying pipeline 1, and the densitometer 503 is lifted to a height of at least 5 cm above the fluidized bed 2. In this way, the real-time monitoring of the density of the slurry near the bottom of the conveying pipeline 1 can be met, the stability of the installation of the densitometer 503 can be ensured, and the presence of the densitometer 503 can be avoided from causing too much interference to the flow of slurry at the bottom of the pipeline.

[0036] In some embodiments, such as Figure 1 As shown, there are multiple sets of densitometers 503, and these sets of densitometers 503 are arranged at intervals along the length of the conveying pipeline 1 to monitor the entire conveying pipeline 1 in real time. This ensures that the central controller 501 can know the flow status of the slurry at each node along the conveying pipeline 1 in real time during the operation of the entire pipeline system. This allows for precise control of the branch pipe assembly 3 in the corresponding area to adjust the air intake and actively interfere with the gas film fluidization disturbance effect, thereby realizing automated anti-deposition operation along the entire pipeline.

[0037] In some embodiments, the intelligent monitoring system 5 further includes a differential pressure transmitter 502 for monitoring pipeline pressure differential; wherein, there are multiple sets of differential pressure transmitters 502, which are arranged at intervals along the length of the conveying pipeline 1. The multiple sets of differential pressure transmitters 502 are installed at intervals along the conveying pipeline 1, dividing the entire conveying pipeline 1 into multiple sections, and monitoring the slurry pressure inside each section of the entire conveying pipeline in real time. With the use of the densitometer 503, dual dynamic monitoring of the conveying of high-moisture materials can be achieved, which can effectively improve the accuracy of slurry conveying status data monitoring and feedback, and provide convenience for the central controller 501 to accurately control the branch pipe assembly 3 of the corresponding node or pipe section to adjust the air intake.

[0038] In some embodiments, the fluidized bed 2 is disposed at the bottom of the conveying pipeline 1 and is installed along the length of the conveying pipeline 1. When the gas supply system 4 supplies gas to the inside of the conveying pipeline 1 through each set of branch pipe assemblies 3, the high-pressure air passes through the micropores on the fluidized bed 2 and can form a strip-shaped air cushion layer 6 composed of an air film fluidized layer at the bottom of the entire conveying pipeline to isolate the high water slurry from contact with the bottom of the pipe, thereby achieving the purpose of preventing the high water slurry from depositing.

[0039] In some embodiments, in order to prevent solid particles in the high-water slurry from clogging the micropores on the fluidized bed 2 and causing the fluidized bed 2 to age, the pore size of the micropores on the fluidized bed 2 is smaller than the minimum particle size of the solid particles in the high-water material. In this way, even if the solid particles in the high-water material come into contact with the fluidized bed 2, they cannot have a substantial impact on the fluidized bed 2.

[0040] In some embodiments, in order to avoid the installation of the fluidized bed 2 affecting the smoothness of the inner wall of the conveying pipe 1, the surface of the fluidized bed 2 is a smooth surface, and the surface of the fluidized bed 2 and the inner wall of the conveying pipe 1 are smoothly transitioned. Moreover, in this design, the smooth surface of the fluidized bed 2 can make the gas film fluidized layer structure generated by the fluidized bed 2 more stable.

[0041] In some embodiments, multiple sets of branch pipe assemblies 3 are arranged side by side along the length of the conveying pipeline 1, and each set of branch pipe assemblies 3 is installed at the bottom of the conveying pipeline 1 so as to cooperate with the fluidized bed 2 to generate an air film fluidized layer at the bottom of the pipeline. Furthermore, the multiple sets of branch pipe assemblies 3 are arranged along the conveying pipeline 1, which is beneficial for the central controller 501 to perform targeted air film pressurization on abnormal nodes or pipe sections based on the slurry data at each node position of the conveying pipeline 1 fed back by the differential pressure transmitter 502 and the density meter 503, thereby improving the air film fluidization disturbance effect and realizing active anti-deposition disturbance interference.

[0042] In some embodiments, such as Figure 2As shown, each branch pipe assembly 3 includes an intake branch pipe 301 and a one-way valve 302, a flow meter 303, and a precision pressure regulating valve 304 installed on the intake branch pipe 301. The flow meter 303 monitors the gas flow rate entering the delivery pipeline 1 through the intake branch pipe 301 in real time and transmits the monitored data to the central controller 501. The precision pressure regulating valve 304 automatically adjusts the gas pressure and supply volume delivered to the delivery pipeline 1 through the intake branch pipe 301 according to the instructions of the central controller 501. Optionally, the precision pressure regulating valve 304 is an electrically controlled high-pressure gas precision pressure regulating valve 304, and the electronic control module on the precision pressure regulating valve 304 is electrically connected to the central controller 501. Additionally, the one-way valve 302 is installed at the end of the intake branch pipe 301 near the gas supply system 4, and the flow meter 303 is located between the one-way valve 302 and the precision pressure regulating valve 304. Utilizing the one-way conduction characteristic of the one-way valve 302 and the cooperation of the precision pressure regulating valve 304, the intake... The branch pipe 301 can form a pressure-stabilizing chamber similar to a gas storage chamber, thereby ensuring that the air pressure inside the intake branch pipe 301 can maintain a relatively stable and high-pressure state. This ensures that the precision pressure regulating valve 304 can continuously and stably supply high-pressure air to the delivery pipeline 1, so as to maintain the stability of the basic gas film on the fluidized bed 2 at the corresponding position. Moreover, in this design, the chamber structure similar to a gas storage and pressure stabilizing chamber formed inside the intake branch pipe 301 with the cooperation of the one-way valve 302 and the tight pressure regulating valve allows the air inside the intake branch pipe 301 to always maintain a relatively high-pressure state. Once the central controller 501 controls the precision pressure regulating valve 304 to increase the intake air volume and increase the gas film pressure, the high-pressure air maintained in the intake branch pipe 301 can effectively improve the response speed and effectiveness of the gas film pressurization. The flow meter 303 monitors the gas flow rate entering the delivery pipeline 1 through the intake branch pipe 301 in real time, providing real-time data reference for the central controller 501 to control the precision pressure regulating valve 304.

[0043] In some embodiments, such as Figure 1 As shown, the air supply system 4 includes an air compressor 401, a drying tank 402, and a pressure stabilizing tank 404. The air inlet of the drying tank 402 is connected to the air outlet of the air compressor 401. The high-temperature, high-humidity, high-pressure air compressed by the air compressor 401 directly enters the drying tank 402 for drying treatment to remove moisture from the air and prevent excessive moisture content from damaging the water-to-ash ratio of the high-moisture material. The air inlet of the pressure stabilizing tank 404 is connected to the air outlet of the drying tank 402 through the main air inlet pipe 403. The air outlet of the pressure stabilizing tank 404 is connected to the air inlet branch pipe 301 of several branch pipe assemblies 3. The dried air processed by the drying tank 402 enters the pressure stabilizing tank 404 through the main air inlet pipe 403. The pressure stabilizing tank 404 serves as a transfer station for high-pressure air, which is then delivered to each group of branch pipe assemblies 3 to complete the air supply.

[0044] In some embodiments, such as Figure 3As shown, the air supply system 4 includes an air compressor 401. The air inlet of the pressure stabilizing tank 404 is connected to the air outlet of the air compressor 401, and the air outlet of the pressure stabilizing tank 404 is connected to the air inlet of the drying tank 402. The air outlet of the drying tank 402 is connected to a distribution pipe 405 through a main air inlet pipe 403. The air inlet branch pipes 301 of the several branch pipe assemblies 3 are all connected to the distribution pipe 405. The bottom of the drying tank 402 is equipped with a pressure relief valve with drainage. In this embodiment, the high-temperature, high-humidity, high-pressure air compressed by the air compressor 401 first enters the pressure stabilizing tank 404 for storage. The high-temperature, high-humidity, high-pressure air is first stored in the pressure stabilizing tank 404. Pre-cooling is performed to allow moisture in the high-pressure air to condense and settle, initially reducing the moisture content of the air. The high-pressure air that has undergone preliminary cooling and condensation then enters the drying tank 402 for drying. Compared to the method of directly drying high-temperature, high-humidity high-pressure air into the drying tank 402, this method can effectively reduce the operating load of the drying tank 402 and extend its service life. Moreover, the high-pressure air after drying directly enters the branch pipe assembly 3 through the main air inlet pipe 403 and the air distribution pipe 405 to complete the air supply. During the entire air supply period, there is no stagnation of high-pressure gas, which can reduce the risk of secondary moisture re-entry.

[0045] This invention also provides a method for preventing sedimentation at the bottom of pipes used in high-water backfilling in coal mines, such as... Figure 4 As shown, this anti-deposition method is applied to Figures 1 to 3 The specific steps of the anti-deposition pipeline system for high-water filling with bottom air film fluidization as shown in any one of the diagrams are as follows: Step 1: Lay and install a high-water-filled anti-deposition pipe system.

[0046] This can be understood as follows: based on the actual needs of coal mine filling and mining, the construction personnel lay a conveying pipeline 1 in the mine roadway. During the laying of the conveying pipeline 1, the branch pipe assembly 3, differential pressure transmitter 502, density meter 503 and fluidized bed 2 are simultaneously installed on the conveying pipeline 1. After the conveying pipeline 1 is laid, the gas supply system 4 is connected and the various command parameters of the central controller 501 are debugged.

[0047] Step 2: Before the filling operation begins, the central controller 501 controls the gas supply system 4 to start, supplying gas to the fluidized bed 2 through the branch pipe assembly 3, establishing a stable basic air film at the bottom of the conveying pipe 1. The pressure of the basic air film is higher than the static pressure of the slurry in the conveying pipe 1, forming an air cushion layer 6 with a thickness of 0.5-3 mm on the fluidized bed 2.

[0048] This can be understood as starting the gas supply system 4 before the filling operation, first establishing an air film fluidized layer at the bottom of the conveying pipeline 1 to construct the air cushion layer 6, in preparation for the subsequent conveying of high-water materials.

[0049] Step 3: The high-water material pumping equipment is started to pump high-water material into the conveying pipeline 1. During this process, the differential pressure transmitter 502 and the density meter 503 monitor the material flow resistance and the density of the slurry at the bottom of the pipeline 1 in real time, and transmit the monitoring data back to the central controller 501.

[0050] This can be understood as follows: during the flow of high-water material in the conveying pipeline 1, the flow status data in each pipeline node or pipe section is monitored in real time by the differential pressure transmitter 502 and the density meter 503, and fed back to the central controller 501 in real time, so that the central controller 501 can know the slurry status in the entire conveying pipeline 1.

[0051] Step 4: The central controller 501 automatically controls the gas supply pressure and flow rate of the branch pipe assembly 3 in the corresponding node section based on the data transmitted back by the sensors installed at each node in the delivery pipeline 1.

[0052] This can be understood as follows: when the differential pressure data fed back by the differential pressure transmitter 502 shows an upward trend or the reading of the densitometer 503 increases, the central controller 501 analyzes the data returned by the sensor and finds that the conveying pipeline 1 in the data abnormal area has a slurry deposition trend. The central controller 501 controls the precision pressure regulating valve 304 in the branch pipe assembly 3 in this area to increase the air supply to enhance the air film fluidization effect. When the data monitored by the differential pressure transmitter 502 and the densitometer 503 return to normal, the central controller 501 then controls the precision pressure regulating valve 304 in the branch pipe assembly 3 in this area to reduce the air supply to the minimum flow rate to maintain the stability of the air film.

[0053] When the precision pressure regulating valve 304 increases the air supply, and the sensor feedback data remains abnormal or continues to deteriorate, the central sensor will issue an alarm.

[0054] It should be noted that in step four, during the backfilling of the goaf in coal mining, the high-water slurry is generally mixed with other materials near the backfilling area. The initial setting time of the mixed slurry is extremely long. Once sedimentation occurs in the pipe, it will easily clump together in a short time. Therefore, when the central controller 501 controls the branch pipe assembly 3 to increase the air supply to solve the sedimentation phenomenon in the pipe, the increase in air supply of the branch pipe assembly 3 needs to be divided into three air supply stages according to the air supply time. From the first air supply stage to the third air supply stage, the air supply of the branch pipe assembly 3 is gradually increased. It should be noted that in the third air supply stage, the increased air supply of the branch pipe assembly 3 is not more than three times the minimum flow rate of the branch pipe assembly 3 to maintain the stability of the gas film.

[0055] When the differential pressure transmitter 502 and / or density meter 503 report abnormal data, the central controller 501 controls the branch pipe assembly 3 in the corresponding area to enter the first gas supply stage. When the time for the branch pipe assembly 3 to increase the gas supply reaches the maximum time limit of the first gas supply stage, the central controller 501 controls the branch pipe assembly 3 to enter the second gas supply stage, further increasing the gas supply. When the gas supply time of the branch pipe assembly 3 in the second gas supply stage reaches the maximum time limit of the second gas supply stage, the central controller 501 controls the branch pipe assembly 3 to enter the final third gas supply stage, further increasing the gas supply. If the gas supply time of the branch pipe assembly 3 in the third gas supply stage reaches the maximum time limit of the third gas supply stage, and the feedback data from the differential pressure transmitter 502 and / or density meter 503 still fails to return to normal, the central controller 501 determines that there is a pipeline fault and issues an alarm at the same time.

[0056] Optionally, the central controller 501 controls the branch pipe assembly 3 to increase the gas supply for three gas supply stages, with the durations as follows: The first gas supply phase lasts 15-20 seconds; The second gas supply phase lasts 10-15 seconds; The third gas supply phase lasts 5-10 seconds.

[0057] It should be noted that this application is not limited to the above-described embodiments. The above embodiments are merely examples, and any embodiments with the same structure and effect as the technical concept within the scope of this application are included in the technical scope of this application. Furthermore, various modifications that can be conceived by those skilled in the art to the embodiments, and other ways of constructing by combining some of the constituent elements of the embodiments, without departing from the spirit of this application, are also included in the scope of this application.

Claims

1. A pipe bottom air film fluidization anti-deposition pipeline system for high water filling, characterized in that, The bottom-pipe air-film fluidized bed anti-deposition pipeline system is used for backfilling goaf areas during coal mining. The bottom-pipe air-film fluidized bed anti-deposition pipeline system includes: Pipelines; Branch pipe assembly, wherein there are multiple sets of branch pipe assemblies, and the multiple sets of branch pipe assemblies are connected to the side wall of the conveying pipeline; A fluidized bed is installed inside the conveying pipeline, and the fluidized bed has a micropore array that connects the branch pipe assembly to the conveying pipeline. A gas supply system, wherein the gas supply system is connected to multiple sets of branch pipe assemblies and provides high-pressure air to the branch pipe assemblies; The intelligent monitoring system includes a density meter installed at the bottom of the delivery pipeline, and a central controller for controlling the gas supply system and the branch pipe assembly to adjust the gas pressure and intake volume.

2. The high-water filling bottom air film fluidization anti-deposition pipeline system according to claim 1, characterized in that, The density meter is in multiple sets, and the multiple sets of density meters are arranged at intervals along the length of the conveying pipeline.

3. The high-water filling bottom air film fluidization anti-deposition pipeline system according to claim 1 or 2, characterized in that, The intelligent monitoring system also includes differential pressure transmitters for monitoring pipeline pressure differentials; there are multiple sets of differential pressure transmitters, which are arranged at intervals along the length of the conveying pipeline.

4. The high-water filling bottom gas film fluidization anti-deposition pipeline system according to claim 1, characterized in that, The fluidized bed is located at the bottom of the conveying pipeline. And / or, The fluidized bed is installed along the length of the conveying pipeline.

5. The high-water filling bottom air film fluidization anti-deposition pipeline system according to claim 1 or 4, characterized in that, The micropore size in the fluidized bed is smaller than the minimum particle size of solid particles in high-water materials.

6. The high-water filling bottom air film fluidization anti-deposition pipeline system according to claim 1 or 4, characterized in that, The surface of the fluidized bed is smooth, and there is a smooth transition between the surface of the fluidized bed and the inner wall of the conveying pipe.

7. The high-water filling bottom air film fluidization anti-deposition pipeline system according to claim 1, characterized in that, Multiple sets of the branch pipe assemblies are arranged side by side along the length of the delivery pipe.

8. The high-water filling bottom air film fluidization anti-deposition pipeline system according to claim 1 or 7, characterized in that, Each branch pipe assembly includes an intake branch pipe and a one-way valve, a flow meter, and a precision pressure regulating valve installed on the intake branch pipe. The flow meter monitors the flow rate of the gas source entering the delivery pipeline through the inlet branch pipe in real time and transmits the monitored data to the central controller. The precision pressure regulating valve automatically adjusts the gas source pressure and gas supply volume delivered into the delivery pipeline through the inlet branch pipe according to the instructions of the central controller.

9. The high-water filling bottom air film fluidization anti-deposition pipeline system according to claim 1, characterized in that, The gas supply system includes an air compressor; A drying tank, wherein the air inlet of the drying tank is connected to the air outlet of the air compressor; A pressure stabilizing tank, wherein the air inlet of the pressure stabilizing tank is connected to the air outlet of the drying tank through a main air inlet pipe, and the air outlet of the pressure stabilizing tank is connected to the air inlet branch pipe in a plurality of branch pipe assemblies. or, The gas supply system includes an air compressor. The air inlet of the pressure stabilizing tank is connected to the air outlet of the air compressor. The air outlet of the pressure stabilizing tank is connected to the air inlet of the drying tank. The air outlet of the drying tank is connected to a distribution pipe through a main air inlet pipe. The air inlet branch pipes of the plurality of branch pipe assemblies are all connected to the distribution pipe.

10. A method for preventing sedimentation at the bottom of a pipe in high-water backfilling in coal mines, characterized in that, The anti-deposition method is applied to the pipe bottom air film fluidization anti-deposition pipeline system for high-water filling as described in any one of claims 1 to 9, and the specific steps are as follows: Lay and install a high-water-filled anti-deposition pipeline system; Before the filling operation begins, the central controller starts the air supply system and supplies air to the fluidized bed through the branch pipe assembly. A stable basic air film is established at the bottom of the conveying pipeline. The pressure of the basic air film is higher than the static pressure of the slurry in the conveying pipeline to form an air cushion layer. The high-water-content material pumping equipment is started to pump high-water-content material into the conveying pipeline. During this process, sensors monitor the material flow resistance and slurry density at each node in the conveying pipeline in real time and transmit the monitoring data back to the central controller. The central controller automatically controls the gas supply pressure and flow rate of the branch pipe components in the corresponding node section based on the data transmitted back from the sensors installed at each node in the delivery pipeline.

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