A coal mine drilling site solid-liquid separation circulating system, method, device and medium

Abstract

This invention discloses a solid-liquid separation and circulation system, method, equipment, and medium for coal mine drilling operations, belonging to the technical field of coal mine drilling operations. It includes a collection end for collecting a coal-water mixture; the collection end includes multiple sets of anti-outburst drilling rigs and mine coal-water pump trucks and blowout prevention devices respectively configured to cooperate with the anti-outburst drilling rigs; a conveying end for conveying the coal-water mixture to a solid-liquid separation end; the conveying end includes a conveying pipeline; a coal-water separation end for solid-liquid separation of the coal-water mixture; the coal-water separation end includes a mine vibrating screen type solid-liquid separator and a mine pressure filter type solid-liquid separator; and a recycling end for conveying the circulating water separated at the coal-water separation end to the collection end to form a closed-loop recycling circuit for drilling wastewater; the recycling end includes a centrifugal pump, a filter, and a circulating water pipeline. This invention solves the technical problem of coal mine wastewater recycling.

Description

Technical Field

[0001] This invention relates to the field of coal mine drilling operation technology, and in particular to a solid-liquid separation and circulation system, method, equipment and medium for coal mine drilling. Background Technology

[0002] The construction of bottom drainage directional drilling sites is a crucial step in achieving regional coal seam outburst mitigation. Because bottom drainage roadways are typically narrow, and directional drilling rigs consume large amounts of flushing water during drilling and slag removal, frequent overflows of coal-water mixtures occur around the drilling site. Currently, bottom drainage drilling sites face the following main technical challenges in wastewater treatment and recycling: The drilling site environment management and roadway drainage system face immense pressure. Traditional slag removal methods mostly rely on natural discharge, where coal slurry from the borehole flows directly into the bottom drainage ditch. Because bottom drainage ditches often have undulating slopes, high-concentration coal slurry easily accumulates in the ditch, obstructing drainage and even overflowing the tracks. This not only increases the labor costs of roadway cleaning but can also lead to prolonged water immersion in the roadway floor, inducing heave and other mine pressure manifestations, threatening the safety of roadway supports. The contradiction between water supply and transportation is prominent. Bottom drainage ditches are usually far from the main water supply network, and the cost of transporting clean water over long distances is high. If wastewater generated from drilling operations cannot be effectively reused, it must be pumped out in stages, resulting in significant waste of electricity and water resources. Existing simple sedimentation treatment methods are far from meeting the wear resistance requirements of high-pressure water pump heads for directional drilling rigs, and fine coal dust easily causes mechanical damage to pump valves and directional probes.

[0003] Most existing solid-liquid separation equipment is bulky and difficult to deploy flexibly in the space-constrained bottom drainage roadways. Furthermore, due to the lack of an automated variable frequency constant pressure feedback mechanism, the system cannot automatically adjust the circulation ratio according to the actual water demand of the drilling site, resulting in high energy consumption and making it difficult to form a true closed-loop recycling circuit. Therefore, developing a circulation system that can adapt to the special environment of bottom drainage roadways and drilling sites, achieve precise coal slurry collection, cascade pressurized transportation, and possess efficient solid-liquid separation and variable frequency constant pressure water supply functions has become an urgent need in the coal mine drilling field to improve operational energy efficiency. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a solid-liquid separation and circulation system, method, equipment, and medium for coal mine drilling sites, aiming to solve the problems of existing technologies.

[0005] To achieve the above objectives, this application provides the following solution: In a first aspect, this application provides a solid-liquid separation and circulation system for a coal mine drilling site, comprising a collection end for collecting a coal-water mixture; the collection end includes multiple sets of anti-outburst drilling rigs and mine coal-water pump trucks and blowout prevention devices respectively configured in conjunction with the anti-outburst drilling rigs; a conveying end for conveying the coal-water mixture to a solid-liquid separation end; the conveying end includes a conveying pipeline; a coal-water separation end for performing solid-liquid separation on the coal-water mixture; the coal-water separation end includes a mine vibrating screen type solid-liquid separator and a mine pressure filter type solid-liquid separator; and a recycling end for conveying the circulating water obtained from the coal-water separation end to the collection end to form a closed-loop recycling circuit for drilling site wastewater; the recycling end includes a centrifugal pump, a filter, and a circulating water pipeline.

[0006] Secondly, this application provides a solid-liquid separation and circulation method for coal mine drilling sites, comprising drilling using an anti-outburst drilling rig, wherein the generated coal-water mixture is sealed and collected in the blowout box of a mine coal-water pump truck through a blowout preventer device, and undergoes preliminary crushing and water replenishment adjustment in the blowout box; the coal-water mixture is pumped into a conveying pipeline by the mine coal-water pump truck, and then pressurized by a secondary coal-water booster conveyor to convey the coal-water mixture to the coal-water separation end; the mixture undergoes primary filtration by a mine vibrating screen solid-liquid separator, and secondary filtration by a mine pressure filter solid-liquid separator to obtain circulating water; the circulating water is collected in a collection tank, and the variable frequency speed of the centrifugal pump is adjusted by monitoring the liquid level in the collection tank and the flow rate in the circulating water pipeline, and the circulating water is conveyed to the water supply interface of the anti-outburst drilling rig through the circulating water pipeline for use as drilling power water.

[0007] Thirdly, this application provides a computer device including one or more processors; and a memory storing computer program instructions, which, when executed, cause the processor to perform the steps of the method described above.

[0008] Fourthly, this application provides a computer-readable medium having a computer program / instructions stored thereon, which, when executed by a processor, implement the steps of the method described above.

[0009] Through the above technical solutions, the beneficial effects of this invention are as follows: The linkage between the blowout preventer and the mine pump truck achieves fully enclosed collection of coal and water in the drilling site, eliminating the phenomenon of coal slurry overflow in the bottom drainage roadway and drilling site from the source, greatly improving the underground working environment; the adoption of a cascaded pressurized conveying and vibrating screen filtration dual-stage physical separation process ensures that the quality of the produced circulating water meets the reinjection standard, effectively extending the service life of the high-pressure pump and precision drilling tools of the directional drilling rig; the constant pressure closed-loop circulation system achieved by combining the controller and the variable frequency centrifugal pump significantly reduces the consumption of clean water in the mine and the wastewater lifting load, significantly improving the efficiency of gas extraction borehole formation while achieving efficient resource conservation and green production. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention, and the embodiments in the accompanying drawings do not constitute any limitation on the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 This is a schematic diagram of the structure of a solid-liquid separation circulation system for a coal mine drilling site provided in an embodiment of this application; Figure 2 A flow chart of a coal mine drilling site solid-liquid separation circulation system provided in an embodiment of this application; Figure 3 A flowchart of a solid-liquid separation and circulation method for a coal mine drilling site provided in an embodiment of this application; Figure 4 This is a schematic diagram of the structure of a computer device provided in one embodiment of this application; The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0012] It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of the application. Rather, these embodiments are provided to make the disclosure more thorough and complete, and to fully convey the scope of the disclosure to those skilled in the art.

[0013] The foregoing and other technical contents, features and effects of the present invention are described in conjunction with the appendix below. Figure 1 The detailed description of the four embodiments will clearly demonstrate this. All structural details mentioned in the following embodiments are based on the accompanying drawings.

[0014] Exemplary embodiments of the present invention will now be described with reference to the accompanying drawings.

[0015] In one exemplary embodiment, such as Figure 1 As shown, a solid-liquid separation and circulation system for coal mine drilling sites is provided. The system includes: The collection end is used to collect coal-water mixtures; the collection end includes multiple sets of anti-outburst drilling rigs and mine coal-water pump trucks and blowout prevention devices respectively configured in conjunction with the anti-outburst drilling rigs. A conveying end is used to convey the coal-water mixture to a solid-liquid separation end; the conveying end includes a conveying pipe. The coal-water separation end is used to separate the coal-water mixture into solid and liquid components; the coal-water separation end includes a mining vibrating screen type solid-liquid separator and a mining filter press type solid-liquid separator; The recycling end is used to transport the circulating water separated at the coal-water separation end to the collection end to form a closed-loop recycling circuit for drilling wastewater; the recycling end includes a centrifugal pump, a filter, and a circulating water pipeline.

[0016] For the acquisition end, multiple sets of anti-outburst drilling rigs are set up at the drilling site. At the borehole opening of each drilling path, the blowout preventer is connected to the wellhead pipe via a sealing flange or fasteners. Due to the high gas pressure and flushing fluid feedback pressure inside the borehole during directional drilling, the blowout preventer uses its internal sealed cavity to capture the high-speed ejected coal-water mixture. This changes the traditional situation of "letting the slurry splash freely" at the drilling site, converting the chaotic mechanical energy into controlled fluid kinetic energy, and drawing the mixture out through a connected pressure-resistant guide pipe.

[0017] The coal-water mixture discharged from each drilling rig flows through its respective guide pipes and ultimately converges at the feed end of the mine coal-water pump truck. The mine coal-water pump truck has a built-in buffer blowout preventer that absorbs the impact of the fluid, preventing slurry overflow. At this point, the pump truck acts as the outpost of the entire system, transforming the dispersed and unstable orifice products into a concentrated slurry to be processed.

[0018] The mixture entering the mine coal-water pump truck is not discharged directly, but undergoes preliminary crushing treatment through the pump truck. The built-in crushing mechanism mechanically shears or breaks up large pieces of coal gangue and nodules in the mixture, ensuring that the particle size of the solid particles meets the flow requirements of the subsequent conveying pump. Based on the slurry concentration monitored by the sensor, the pump truck adds an appropriate amount of clean water in a timely manner to adjust its consistency to the most suitable state for pumping, improving the fluidity of the high-concentration coal slurry. The treated slurry, under the action of the slurry pump on the pump truck, obtains the initial pressure head required to enter the conveying pipeline, providing the necessary power support for subsequent long-distance, cross-tunnel transportation.

[0019] At the conveying end, the coal-water mixture (slurry) processed at the collection end enters the conveying pipeline directly. This pipeline uses high-strength, wear-resistant mining pipe materials and is laid along the sidewall or top support of the bottom drainage roadway. Because the bottom drainage roadway often has local undulations, slopes, or bends, the conveying end utilizes the completely enclosed nature of the pipeline, overcoming the drawbacks of traditional open-ditch slag discharge methods that are limited by gravity and slope. Under this closed-pressure conveying mode, the waste slurry can flow stably across undulating terrain to the distant treatment center, solving the problems of roadway floor softening and environmental pollution caused by slurry overflow or spillage.

[0020] During long-distance transport, the conveying end achieves effective pressure maintenance through its internal power configuration. The coal-water mixture is pressurized in the pipeline in fluid form. The low-resistance design of the pipeline inner wall, combined with the initial pressure head provided by the collection end, keeps the slurry moving above the critical settling velocity, preventing coal dust from accumulating at the bottom of the pipe and causing blockages. In ultra-long-distance or bottom-extraction roadway conditions with significant elevation differences, the conveying end uses relay pumping to ensure that the mixture still has sufficient inlet pressure when it reaches the coal-water separation end, guaranteeing the continuity and stability of the conveying system.

[0021] The implementation of this conveying end, through a pipe-based design instead of trenches, achieves environmental cleanliness during the transfer process. The confined flow of the slurry within the pipes not only prevents secondary dispersion of coal dust but also avoids cross-interference between waste slurry and other drainage systems within the roadway. Simultaneously, the pipeline-based transfer method significantly saves limited floor space in the roadway, freeing up space for material transport, personnel movement, and other drilling rig auxiliary operations within the bottom pumping roadway, thus achieving coordinated operation between drilling and roadway maintenance.

[0022] For the coal-water separation stage, the coal-water mixture is first discharged into a mining vibrating screen solid-liquid separator. At this stage, the high-frequency vibration generated by the motor-driven screen box causes intense disturbance and stratification of the slurry on the screen surface. Larger particles of coal gangue, drill cuttings, and large coal lumps are trapped on the screen side and move towards the discharge port under the action of vibration, ultimately being discharged from the system for centralized storage. This stage removes most of the solid load from the slurry, preventing mechanical wear of the subsequent high-pressure filter pump and filter cloth by coarse and hard particles, and achieving initial volume reduction of the solid-liquid mixture.

[0023] After primary screening, the underflow (fine coal slurry) is collected and pumped into a mine-use filter press solid-liquid separator by a slurry pump. In this cascaded purification process, the fine coal slurry undergoes high-pressure compression within a closed filter chamber. Fine coal particles are trapped on the filter cloth surface, and with continuous pressure injection, these particles are compressed together to form a dense, low-moisture coal cake. At the end of the filtration cycle, the filter plates automatically open, and the coal cake falls off. This process utilizes physical mechanical pressure to overcome the high viscosity of the fine coal slurry, completing the essential transformation from a fluid slurry to a solid mass, significantly reducing the volume of the coal slurry and facilitating its transport underground via conveyor belts or mine cars.

[0024] The final product of the cascaded purification is the liquid phase discharged through the filter cloth, i.e., the clear liquid. Due to the deep retention caused by mechanical pressure filtration, the suspended solids content in this clear liquid is significantly reduced, eliminating the risk of coal dust abrasion on the packing and seals of the drilling rig's high-pressure water pump. This module's function is not merely simple filtration, but rather, through the cascade coupling of vibration and pressure filtration, it alters the physical properties of the bottom pumping tunnel wastewater, decomposing it into easily transportable solid resources (coal cake) and reusable process water (clear liquid), achieving thorough treatment and clean products.

[0025] For the recycling end, the clarified liquid discharged from the filter press first undergoes a final safety interception through a filter. This process captures any tiny suspended particles that may remain due to filter cloth damage or system fluctuations. This fine filtration barrier ensures that the recycled water quality fully meets the influent standards for the anti-outburst drilling rig's high-pressure pump unit, fundamentally eliminating the risk of wear and clogging of drill bit nozzles and in-hole directional measuring instruments by fine particles.

[0026] The filtered clean circulating water gains stable head energy driven by a centrifugal pump. The centrifugal pump injects the circulating water into a circulating water pipeline, which runs along the pipe rack or sidewall of the bottom extraction roadway, taking a path opposite to the coal slurry transport direction, and transports the water back to the front-end collection area across the entire construction area. This dual-pipeline layout, transporting coal slurry on the outward trip and clean liquid on the return trip, enables the dynamic water to circulate autonomously within the drilling site, reducing reliance on the mine's remote water supply system.

[0027] The circulating water pipeline is directly connected to the water supply interface of each anti-outburst drilling rig. During drilling, the circulating water re-enters the borehole as a coolant and slag removal carrier, completing a closed loop from "collection-transportation-separation-reuse". This module creates a miniature, independent fluid balance system within the bottom drainage roadway, operating independently of the mine's main drainage system. This not only meets the cooling and slag removal power requirements of drilling but, more importantly, enables on-site digestion and zero external discharge of drilling wastewater, solving the engineering challenge of deploying large-scale drainage facilities in bottom drainage roadways due to space constraints.

[0028] In one specific embodiment, the acquisition terminal includes: The blowout preventer is installed at the orifice of the anti-outburst drill and is used to seal the orifice and transport the coal-water mixture generated during drilling to the blowout preventer box of the mine coal-water pump truck. The mining coal-water pump truck transports the collected coal-water mixture to the conveying end after preliminary crushing and water replenishment.

[0029] The blowout preventer is made of flame-retardant and anti-static materials and is secured to the orifice pipe of the anti-outburst drilling rig via a high-pressure sealing flange. The device contains a gas pressure buffer chamber and a wear-resistant sealing ring. When the drilling rig performs directional drilling, the coal-water mixture with pulse pressure flowing back into the borehole is confined within the sealing chamber, effectively preventing the slurry from splashing into the roadway. A large-diameter discharge port is located on the side of the device and is connected to the feed inlet of a mine coal-water pump truck via a pressure-resistant hose. This design utilizes the residual pressure inside the borehole as an initial thrust to guide the collected coal, water, and gas mixture directionally into the blowout preventer, achieving closed-loop drainage of the coal slurry.

[0030] The mining coal-water pump truck is equipped with an integrated blowout preventer (BOP). Gas enters the extraction pipeline, and the coal-water mixture enters the crushing device. The bottom of the BOP can be designed as a cone to facilitate the collection of solid particles towards the center. In this embodiment, the BOP not only acts as a fluid buffer, eliminating the impact of high-pressure slurry on the internal components of the pump truck, but also serves as a small regulating reservoir to balance flow fluctuations caused by uneven slag discharge from the drilling rig.

[0031] The primary crushing device is driven by a mine-use explosion-proof motor and is equipped with alloy wear-resistant crushing teeth. When the mixture contains large, fragmented coal gangue or nodules, the crushing teeth mechanically shear and crush them to a particle size of less than 5 mm. The engineering significance of this step is that by controlling the solid particle size in advance, mechanical blockage of subsequent conveying pipelines and valves is prevented, ensuring the pumpability of the slurry.

[0032] To optimize the flowability of the slurry during long-distance transportation, the mine coal-water pump truck is equipped with a water replenishment system. A concentration sensor or level float is installed inside the blowout preventer (BOP). When the system detects that the slurry is too thick or the flow resistance is increased, it automatically sprays an appropriate amount of clean water into the BOP. Through the coupling effect of preliminary crushing and water replenishment, the originally viscous and complex coal-water mixture is transformed into a homogeneous, standardized slurry, which is then stably transported to the delivery end by the pump truck's own discharge pump.

[0033] In one specific embodiment, the conveying end further includes: The conveying pipeline adopts a series pressurized conveying method to transport the coal-water mixture to the solid-liquid separation end; A secondary coal-water booster conveyor is installed in the middle section of the conveying pipeline. The secondary coal-water booster conveyor is used to provide secondary power when the conveying distance exceeds a preset threshold, so as to ensure the pressure of the coal-water mixture when it reaches the coal-water separation end.

[0034] The conveying pipeline can use DN65 diameter pipes, enabling long-distance pumping up to 800m. When the conveying distance exceeds 800m, a series pressurization conveying mode can be adopted. In this mode, the overall power at the conveying end consists of the initial pumping power at the acquisition end and the secondary reinforcement power in the middle section of the pipeline. This structure decomposes the originally single end thrust into segmented drives, ensuring that the coal-water mixture in the pipeline maintains a dynamic pressure level sufficient to overcome local resistance and gravitational potential energy during long-distance transport. This cascaded power layout effectively avoids the decrease in flow velocity caused by undulating terrain in the bottom pumping roadway or excessive distance, ensuring that the high-concentration slurry is in a turbulent state and preventing pipe burial accidents caused by coal dust settling.

[0035] A secondary coal-water booster conveyor is installed at the geometric midpoint of the conveying pipeline or at the critical location of the calculated pressure drop. This booster conveyor is physically connected in series within the conveying pipeline, and its core components include a highly wear-resistant flow chamber and a variable frequency booster pump set. The booster adopts a fully enclosed structure and seamlessly connects to the conveying pipeline interface. Its function is similar to a relay station on the pipeline; when the mixture pumped from the collection end reaches this location, the booster performs secondary work, significantly increasing the static pressure of the slurry and providing the mixture with the residual pressure required to reach the final coal-water separation end.

[0036] The intervention of the secondary coal-water booster conveyor follows a distance-preset threshold triggering mechanism. At the bottom venting roadway operation site, a maximum stable conveying distance (e.g., 800 meters) is calculated based on the slurry density and pipe diameter and set as the preset threshold. When the conveying distance is below this threshold: the system can operate solely on the initial power from the acquisition end, with the secondary booster in bypass or low-power maintenance mode; when drilling progress causes the conveying distance to exceed this threshold: the booster senses the pressure drop at the inlet end through a pressure sensor and automatically increases its operating speed to provide secondary power compensation. This mechanism ensures that regardless of the drilling site's relocation, the coal-water mixture reaching the coal-water separation end always has a stable inlet pressure, ensuring the continuity of feeding for subsequent vibrating screening and filtration processes.

[0037] In one specific embodiment, the mining vibrating screen solid-liquid separator is used to perform primary filtration on the coal-water mixture, separating coarse coal slime with a particle size larger than a set first threshold, to obtain fine coal slime water.

[0038] The mining vibrating screen solid-liquid separator is equipped with two identical vibrating hoppers. These two hoppers are connected to the conveying pipeline via a feed switching valve. In actual operation, the system controls the feed switching valve to allow the coal-water mixture to alternately enter one of the hoppers for filtration. This configuration of one in use and one in standby, with cyclical switching, solves the problem of having to stop the machine when discharging slag from a single hopper, ensuring that the downstream separation system can achieve uninterrupted cascade purification 24 hours a day while the front-end drilling rig continues drilling.

[0039] Each vibrating hopper has a filter port on its side, and a high-strength stainless steel screen is installed inside the filter port. When the coal-water mixture enters the hopper, under the action of the high-frequency vibration of the entire hopper, the slurry generates a violent turbulence effect. Water and fine particles with a particle size smaller than the set first threshold quickly pass through the screen and are discharged from the filter port, forming fine coal slurry water, which is then collected in the subsequent pressure filtration process.

[0040] The bottom of the vibrating silo is designed to be openable. During the filtration stage, the bottom structure is in a tightly closed state, bearing the weight and vibration impact of the coal-water mixture. When the coarse coal slime in the silo reaches the preset load or the filtration cycle ends, the system switches to feeding into another silo. Subsequently, the silo stops vibrating and opens its bottom, allowing the coarse coal slime, gangue, and other coarse coal particles trapped inside to be quickly discharged by their own weight, falling onto the conveyor equipment below.

[0041] By adjusting the aperture size of the side filter screen, the first filtration threshold can be precisely set. This design ensures that the separated coarse coal slime has a low moisture content, facilitating direct conveyor belt transport. Simultaneously, the resulting fine coal slime exhibits a uniform water composition, significantly reducing the feed pressure and filter cloth wear of subsequent mine-use filter press solid-liquid separators, achieving segmented, targeted, and highly efficient purification.

[0042] In one specific embodiment, the mining filter press solid-liquid separator is used to perform secondary filtration of the fine coal slurry water to produce filter cake and the circulating water.

[0043] The mining filter press solid-liquid separator is connected to an intermediate collection tank after primary filtration via a high-pressure slurry pump. Fine coal slurry is fed into multiple sealed filter chambers of the filter press under high pressure. The filter chambers are tightly compressed by high-strength filter plates and wear-resistant filter cloth. At this stage, the high-pressure power fills the filter chambers with fine coal slurry, providing the necessary static pressure conditions for subsequent forced solid-liquid phase separation.

[0044] As the pressure is maintained, the liquid in the fine coal slurry passes through layers of filter cloth under the pressure difference and is discharged through the guide holes on the filter plates. Because the pore size of the filter cloth is much smaller than the particle size of the fine coal powder, the fine coal powder is trapped in the filter chamber and accumulates continuously. Under continuous high pressure, these fine coal particles interlock, gradually expelling the free water between the particles, and finally forming a filter cake with a certain hardness and low moisture content in the filter chamber. This process achieves a qualitative change from high-viscosity fine coal slurry to solid coal cake, greatly reducing the difficulty of subsequent material processing.

[0045] When the feed pressure in the filter chamber reaches the set threshold or the effluent flow rate decreases to a preset value, the system determines that the dewatering cycle is complete. At this time, the hydraulic clamping device of the filter press is released, and the filter plates open sequentially under the action of the plate pulling mechanism. The formed filter cake automatically falls from between the filter plates under gravity and falls onto the collection device or conveyor belt below. After unloading, the filter plates close and clamp again, entering the next feeding and dewatering cycle. This automated periodic operation ensures the continuous and efficient treatment of fine coal slurry water by the system.

[0046] The liquid phase discharged through the filter cloth is the circulating water. Thanks to the filtration process's ability to intercept micron-sized particles, the produced circulating water is clear and transparent with extremely low suspended solids content, eliminating the threat of fine particles in the water to the subsequent recycling pump set and precision components of the drilling rig. This module completes a key step in wastewater resource treatment through physical pressure, namely, producing a solid product (coal cake) that can be shipped out and a high-quality liquid (circulating water) that can be reused.

[0047] In one specific embodiment, a water collection tank is provided at the coal-water separation end and the recycling section; a level gauge is provided at the water collection tank, and a flow meter is provided at the circulating water pipeline; The system also includes a controller, which is connected to the level gauge, the flow meter and the centrifugal pump respectively, and is used to automatically adjust the variable frequency speed of the centrifugal pump according to the water level in the collection tank to provide constant pressure water supply.

[0048] A collection tank is installed between the coal-water separation end and the recycling end to collect the clarified liquid produced by pressure filtration. A high-precision level gauge (such as an ultrasonic level gauge or a hydrostatic level gauge) is installed on the inner wall of the collection tank to monitor the dynamic changes in the water level in real time. Simultaneously, a flow meter is installed on the circulating water pipeline at the recycling end. The level gauge provides the water supply signal, and the flow meter provides the terminal demand signal; together, they form the data basis for the system's automatic adjustment.

[0049] The system is equipped with an industrial-grade controller (such as a PLC or microcontroller control box), which is electrically connected to the variable frequency drives of the level gauge, flow meter, and centrifugal pump via shielded cables or an industrial wireless network. The controller has a built-in PID (proportional-integral-derivative) control algorithm, which can compare the set target water supply pressure with the actual flow feedback in real time, and calculate the optimal power output parameters by combining the water level in the collection tank.

[0050] The controller automatically adjusts the variable frequency speed of the centrifugal pump according to preset logic instructions: when the water level in the sump is high and the water demand of the drilling rig increases, the controller drives the centrifugal pump to run at high frequency to ensure constant pressure in the circulating water pipeline and meet the power requirements for slag removal. When the drilling rig stops drilling or the water level in the sump reaches the low warning line, the controller automatically reduces the pump speed or enters sleep mode to prevent the centrifugal pump from running dry and being damaged, while also achieving significant energy saving and consumption reduction. This variable frequency regulation mechanism eliminates the water hammer effect caused by manual pump start-up and shutdown, ensuring stable operation of the circulating water pipeline in complex bottom pumping tunnel environments.

[0051] This feedback regulation, achieved through the controller, enables the system to establish an adaptive fluid balance loop within the bottom dredging tunnel. Regardless of fluctuations in the water production rate at the separation end, the system can automatically maintain stable pressure at the water supply end through the coupling relationship between liquid level and frequency. This design not only reduces the intensity of manual inspections but also ensures that the anti-outburst drilling rig can always perform directional drilling under constant hydraulic conditions, thereby improving the quality of borehole formation.

[0052] In one specific embodiment, the recycling loop includes: The filter is a basket filter, and the centrifugal pump is a horizontal centrifugal pump; The basket filter is installed at the outlet of the horizontal centrifugal pump to remove suspended impurities in the circulating water. The circulating water pipeline is connected to the water supply interface of the anti-outburst drilling rig, providing cooling and slag removal power water for drilling operations.

[0053] The centrifugal pump selected is a horizontal centrifugal pump. The motor and pump body of a horizontal centrifugal pump are arranged horizontally, a structural feature that results in a low center of gravity and strong operational stability. In the height-constrained environment of bottom-drainage drilling sites, the horizontal structure allows for easy installation on a skid-mounted base frame, facilitating daily disassembly and maintenance, reducing the overall height of the equipment, effectively avoiding cable hooks and pipe supports at the top of the roadway, and improving the equipment's mobility and spatial adaptability.

[0054] The filter is a basket filter, which contains a basket-shaped filter element made of stainless steel perforated plate, offering a large effective filtration area and low resistance. In this embodiment, the basket filter is installed at the outlet of the horizontal centrifugal pump. The engineering significance of this layout is that the outlet pressure provided by the centrifugal pump forces the circulating water through the filter basket, thoroughly intercepting any trace floating impurities and seal wear debris that may accidentally remain during the pressure filtration process. The basket structure allows for quick and easy disassembly and cleaning; simply stopping the pump and opening the top cover allows for the removal of the filter basket for dust removal, significantly reducing maintenance time.

[0055] The terminal of the circulating water pipeline is directly connected to the water supply interface of the anti-outburst drilling rig via a high-pressure quick connector. The finely filtered circulating water is delivered to the drilling rig to cool the high-speed rotating drill bit and the power drilling tools inside the hole, absorbing heat generated by mechanical friction and preventing damage to the drilling tools or the risk of gas ignition due to overheating. The high-pressure circulating water creates outward hydrodynamic pressure at the bottom of the hole, carrying coal dust and slag generated during drilling out of the hole along the outer wall of the drill pipe. This configuration utilizes the recovered circulating water to achieve dynamic fluid balance within the drilling site while ensuring stable drilling process parameters (pressure, flow rate).

[0056] By placing the filter after the pump and connecting it to the drilling rig at the end of the pipeline, a safe and reliable secondary water supply line is constructed in the bottom drainage roadway at the recycling end. Even if there are fluctuations in the front-end separation process, the basket filter can act as a safety gate to protect the anti-outburst drilling rig and directional measurement probe, ensuring the continuity of drilling operations and solving the secondary disaster risks to roadway safety caused by wastewater discharge from the bottom drainage roadway.

[0057] In one exemplary embodiment, a solid-liquid separation and circulation system for a coal mine drilling site is provided, the entire process of which operates as follows: Figure 2 As shown, the specific implementation steps are as follows: Multi-station synchronous data acquisition phase: At the bottom drainage roadway working face, the system is equipped with multiple sets of anti-outburst drilling rigs operating simultaneously. The raw coal-water mixture discharged by each drilling rig is first collected by its matching tracked coal-water pump truck. The pump truck utilizes its onboard blowout preventer to absorb the pressure at the orifice and performs preliminary crushing of coal slag inside. The tracked chassis design allows the pump truck to closely follow the drilling rig's advance rhythm and flexibly adjust its position in the narrow bottom drainage roadway, ensuring that the acquisition end and the drilling site always maintain the optimal distance.

[0058] Pressure-compensated transport stage: The coal-water mixture, initially treated by the pump truck, enters the DN65 transport pipeline. To meet the needs of long-distance transport, each transport line is equipped with a dedicated power pump unit for relay operation. The coal-water mixture is pressurized at high speed within the sealed pipeline, traversing the tunnel space. The four DN65 pipelines eventually converge, uniformly transferring waste slurry generated at different drilling locations to the subsequent coal-water separation end.

[0059] Cascaded solid-liquid separation treatment stage: The collected coal-water mixture passes through two stages of high-performance separation equipment: First stage coarse filtration: The mixture first enters a mining vibrating screen-type solid-liquid separator. This equipment uses high-frequency vibration to separate large drill cuttings from the water. The screened solid coal slag is directly disposed of on the ground or transported off-site, while the underflow liquid becomes fine coal slurry and enters the next stage. Second stage fine filtration: The fine coal slurry is pumped into a mining pressure filter-type solid-liquid separator. Under strong pressure filtration, fine particles are completely trapped and form filter cake, while the filtered liquid phase is converted into clean circulating water.

[0060] Water collection, storage, and monitoring phase: The circulating water produced by the filter press is collected in a collection tank, which acts as a "buffer reservoir" for the entire system, regulating the water balance. Through real-time monitoring by the level gauge, the controller can determine the total amount of reclaimed water currently available in the system, providing data support for subsequent circulating water supply.

[0061] In the circulating water reuse stage: the core power module at the recycling end (including a horizontal centrifugal pump and control box) is responsible for re-injecting the clean water into the system. Before pumping, the circulating water is further filtered to remove suspended impurities, ensuring that the water quality meets the drilling rig's operating standards. The power pump unit uses a DN100 circulating water pipeline to reverse-transport the clean water back to the front-end anti-outburst drilling rigs or coal-water pump trucks for water supply. The reused water is then used again for drilling rig cooling and slag removal operations. Thus, the system forms a complete closed-loop circulation system from drilling site wastewater to drilling site power water.

[0062] This system achieves zero coal slurry spillage and zero wastewater discharge within the bottom drainage roadway. The configuration of DN65 small-diameter collection pipes and DN100 large-diameter main return water ensures both the collection efficiency of each branch drilling site and the stability of the return water main, greatly reducing the cost of clearing water distribution in the mine and protecting the working environment of the bottom drainage roadway.

[0063] Based on the same inventive concept, this application also provides a solid-liquid separation and circulation method for coal mine drilling sites. The solution provided by this method is similar to the solution described in the above system. Therefore, the specific limitations in one or more method embodiments provided below can be found in the corresponding limitations above, and will not be repeated here.

[0064] In one exemplary embodiment, such as Figure 3 As shown, a solid-liquid separation and circulation method for coal mine drilling sites is provided and applied to the above-mentioned system, including the following steps: S101, drilling is carried out by anti-outburst drilling rig, and the resulting coal-water mixture is sealed and collected in the blowout box of the mine coal-water pump truck through the blowout preventer device, and is initially crushed and water replenished in the blowout preventer box; S102, the coal-water mixture is pumped into the conveying pipeline by a mine coal-water pump truck, and then pressurized by a secondary coal-water booster conveyor to convey the coal-water mixture to the coal-water separation end; S103 undergoes primary filtration via a mining vibrating screen solid-liquid separator and secondary filtration via a mining pressure filter solid-liquid separator to obtain circulating water. S104, the circulating water is collected into a water collection tank. By monitoring the water level in the water collection tank and the flow rate of the circulating water pipeline, the variable frequency speed of the centrifugal pump is adjusted, and the water is transported to the water supply interface of the anti-outburst drilling rig through the circulating water pipeline for use as drilling power water.

[0065] This invention achieves automated integration of drilling slag removal, slurry transportation, solid-liquid separation, and reclaimed water reuse through a closed-loop system for the entire process of wastewater recovery and purification in coal mine drilling sites. Compared to traditional technologies, the advantages of this invention are as follows: it changes the traditional open slag removal mode in bottom drainage roadways, completely solving the problem of coal slurry overflow and clogging of roadway water ditches through sealed collection and pipeline transportation, significantly improving the standardized working environment underground; relying on cascade purification technology, it converts high-concentration coal-water mixtures into transportable dry coal cakes and high-quality circulating water, realizing closed-loop on-site water resource circulation, significantly reducing the supply consumption of mine clean water and the pressure of wastewater lifting; the combination of constant pressure variable frequency water supply and multi-stage fine filtration technology ensures that the quality of recycled water meets the process requirements of drilling rigs, effectively reducing the erosion and loss of directional drilling tools and high-pressure pump sets caused by coal dust particles. In summary, this invention constructs a highly efficient, low-consumption, and green directional drilling site auxiliary operation system, providing reliable technical support and equipment guarantee for gas outburst suppression operations in high-gas mines.

[0066] In one exemplary embodiment, a computer device is provided, which may be a server or a terminal, and its internal structure diagram may be as follows. Figure 4 As shown, this computer device includes a processor, memory, input / output (I / O) interfaces, and a communication interface. The processor, memory, and I / O interfaces are connected via a system bus, and the communication interface is also connected to the system bus via the I / O interfaces. The processor provides computational and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system, computer programs, and databases. The internal memory provides the environment for the operating system and computer programs stored in the non-volatile storage media to run. The I / O interfaces are used for exchanging information between the processor and external devices. The communication interface is used for communicating with external terminals via a network connection.

[0067] Those skilled in the art will understand that Figure 4 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0068] In one exemplary embodiment, a computer device is also provided, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the steps in the above-described method embodiments.

[0069] In one exemplary embodiment, a computer-readable storage medium is provided storing a computer program that, when executed by a processor, implements the steps in the above-described method embodiments.

[0070] In one exemplary embodiment, a computer program product is provided, including a computer program that, when executed by a processor, implements the steps in the above-described method embodiments.

[0071] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory may include read-only memory (Read-Only Memory). Memory includes ROM, magnetic tape, floppy disk, flash memory, optical storage, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM).

[0072] The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

[0073] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0074] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only intended to help understand the methods and core ideas of this application. Furthermore, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A solid-liquid separation and circulation system for coal mine drilling sites, characterized in that the system... include: The collection end is used to collect coal-water mixtures; the collection end includes multiple sets of anti-outburst drilling rigs and mine coal-water pump trucks and blowout prevention devices respectively configured in conjunction with the anti-outburst drilling rigs. A conveying end is used to convey the coal-water mixture to a solid-liquid separation end; the conveying end includes a conveying pipe. The coal-water separation end is used to separate the coal-water mixture into solid and liquid components; the coal-water separation end includes a mining vibrating screen type solid-liquid separator and a mining filter press type solid-liquid separator; The recycling end is used to transport the circulating water separated at the coal-water separation end to the collection end to form a closed-loop recycling circuit for drilling wastewater; the recycling end includes a centrifugal pump, a filter, and a circulating water pipeline.

2. The system according to claim 1, characterized in that, The acquisition terminal includes: The blowout preventer is installed at the orifice of the anti-outburst drill and is used to seal the orifice and transport the coal-water mixture generated during drilling to the blowout preventer box of the mine coal-water pump truck. The mining coal-water pump truck transports the collected coal-water mixture to the conveying end after preliminary crushing and water replenishment.

3. The system according to claim 1, characterized in that, The conveying end also includes: The conveying pipeline adopts a series pressurized conveying method to transport the coal-water mixture to the solid-liquid separation end; A secondary coal-water booster conveyor is installed in the middle section of the conveying pipeline. The secondary coal-water booster conveyor is used to provide secondary power when the conveying distance exceeds a preset threshold, so as to ensure the pressure of the coal-water mixture when it reaches the coal-water separation end.

4. The system according to claim 1, characterized in that, The mining vibrating screen solid-liquid separator is used to perform primary filtration on the coal-water mixture, separating coarse coal slime with a particle size larger than a set first threshold, and obtaining fine coal slime water.

5. The system according to claim 4, characterized in that, The mining filter press solid-liquid separator is used for secondary filtration of the fine coal slurry water to produce filter cake and circulating water.

6. The system according to claim 1, characterized in that, The coal-water separation end and the recycling section are equipped with water collection tanks; the water collection tanks are equipped with level gauges, and the circulating water pipes are equipped with flow meters; The system also includes a controller, which is connected to the level gauge, the flow meter and the centrifugal pump respectively, and is used to automatically adjust the variable frequency speed of the centrifugal pump according to the water level in the collection tank to provide constant pressure water supply.

7. The system according to claim 6, characterized in that, The recycling loop includes: The filter is a basket filter, and the centrifugal pump is a horizontal centrifugal pump; The basket filter is installed at the outlet of the horizontal centrifugal pump to remove suspended impurities in the circulating water. The circulating water pipeline is connected to the water supply interface of the anti-outburst drilling rig, providing cooling and slag removal power water for drilling operations.

8. A solid-liquid separation and circulation method for coal mine drilling sites, applied to the system described in any one of claims 1 to 7, characterized in that, The method includes: Drilling is carried out by an anti-outburst drilling rig. The resulting coal-water mixture is sealed and collected in the blowout box of the mine coal-water pump truck through the blowout preventer device, where it undergoes initial crushing and water replenishment. The coal-water mixture is pumped into the conveying pipeline by a mine coal-water pump truck, and then further pressurized by a secondary coal-water booster conveyor to transport the coal-water mixture to the coal-water separation end. The solid-liquid separator is used for primary filtration, and then for secondary filtration using a filter press to obtain circulating water. The circulating water is collected in a water collection tank. By monitoring the water level in the water collection tank and the flow rate of the circulating water pipeline, the variable frequency speed of the centrifugal pump is adjusted, and the water is transported through the circulating water pipeline to the water supply interface of the anti-outburst drilling rig for use as drilling power water.

9. A computer device, characterized in that, The computer device includes: One or more processors; and A memory storing computer program instructions, which, when executed, cause the processor to perform the steps of the method as described in claim 8.

10. A computer-readable medium having a computer program / instructions stored thereon, characterized in that, When the computer program / instructions are executed by the processor, they implement the steps of the method of claim 8.

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