A continuous pumping system of high-flux slurry for gob area treatment in a well

Abstract

This invention relates to the field of mine filling technology and discloses a continuous pumping system for high-throughput slurry used in underground goaf treatment. The system includes a pumping drive unit, a pipeline sensing unit, and a central control unit. The central control unit superimposes a sinusoidal disturbance signal at the pumping reference frequency to construct a pressure disturbance wave carrying phase characteristics. It extracts the phase offset parameter of the pipeline response waveform and identifies the pipeline as being in a metastable deposition stage when the rate of change of the phase offset parameter exceeds a threshold. It outputs a flutter signal to induce softening of the sediment interface and connects to output an asymmetric pressure pulse with a rising slope greater than a falling slope to peel off the sediment. It uses the impact signal at the moment of pump head stroke switching to correct wave velocity drift. This invention identifies abnormal flow resistance during the deposition stage before the outlet pressure exhibits significant fluctuations, reduces the instantaneous peak pressure during the unblocking process through a softening and peeling mechanism, and maintains the structural safety of the pipeline network under high-throughput transportation conditions.

Description

Technical Field

[0001] This invention relates to a continuous pumping system for high-throughput slurry used in the treatment of underground goaf areas, belonging to the field of mine filling technology. Background Technology

[0002] Currently, in the treatment of goaf areas in mines, the mainstream solution uses pipelines to transport cemented slurry for backfilling operations. Variable frequency drive pump sets are used to adjust the output frequency based on constant flow or constant pressure criteria to maintain stable pumping. High-solids slurry has non-Newtonian fluid characteristics and is limited by shear thinning and yield stress during long-distance transport. The shear force distribution in the pipe wall boundary layer is uneven. When the pumping throughput is increased, the low shear field near the wall leads to coarse aggregate deposition, inducing thickening of the filter cake on the pipe wall. Since this type of deposition mainly occurs at the flow field edge and does not change the flow state in the main channel of the pipeline center, outlet pressure monitoring methods cannot obtain signals in the early stages of deposition, creating a sensing blind zone.

[0003] While optimizing the hardware structure of the device can improve the level of automation, the control layer lacks the ability to dynamically perceive and actively intervene in the rheological characteristics of the conveyed medium. For example, Chinese invention patent application CN109653791A discloses an intelligent gangue pumping and filling system for underground coal mines. It achieves mechanical cooperation and process automation by integrating crushing, stirring and spraying hardware modules. Such solutions focus on passive equipment coordination, and the perception logic focuses on macroscopic video monitoring or conventional pressure threshold judgment. It lacks an endogenous signal analysis mechanism for the evolution of fluid state in the pipe. When faced with unsteady flow of high-concentration slurry, it cannot capture weak anomalies in flow resistance, the identification response is lagging, and the execution logic is disconnected from the rheological characteristics of the slurry. It is difficult to actively remove deposits through targeted disturbances while ensuring the safety of the pipeline structure. For the accumulation of pipeline resistance, the linear adjustment method of increasing pumping pressure is prone to compressing and compacting the deposit layer, resulting in irreversible embolism. The detection path of laying distributed sensors and other external hardware has a low hardware survival rate and high maintenance cost in the high corrosion and strong scouring environment underground.

[0004] Therefore, how to utilize the endogenous signals of the pumping system to characterize the pipeline flow state and construct a blockage-clearing mechanism adapted to the characteristics of non-Newtonian fluids has become the technical problem to be solved by this invention. Summary of the Invention

[0005] To address the problems mentioned in the background art, the technical solution of the present invention is as follows: A continuous pumping system for high-throughput slurry used in underground goaf treatment, comprising a pumping drive unit, a pipeline sensing unit, and a central control unit, the system following the operating rules:

[0006] The central control unit is used to control the pump drive unit to superimpose a frequency on the reference operating frequency. Hz to A sinusoidal disturbance signal of Hz is used to cause the slurry train in the pipeline network to form a pressure disturbance carrying phase characteristics;

[0007] The pipeline sensing unit is used to collect the response pressure waveforms of pipeline monitoring nodes in the pipeline network;

[0008] The central control unit is used to extract the phase offset parameter of the response pressure waveform relative to the sinusoidal disturbance signal, and when the rate of change of the phase offset parameter continues to exceed the preset phase change rate threshold, it determines that the pipeline monitoring node is in the metastable deposition stage.

[0009] The central control unit is used to switch the output mode of the pumping drive unit after determining that the metastable deposition stage has been reached. First, it controls the pumping drive unit to output a flutter signal of a preset duration, which uses the shear thinning characteristics of the slurry to reduce the interfacial cohesion between the sediment and the inner wall of the pipe network during the metastable deposition stage. Then, it connects to output an asymmetric pressure pulse with a rising slope greater than a falling slope, which uses fluid inertia to generate an unbalanced shear force at the softened interface to peel off the sediment.

[0010] The central control unit is also used to extract the inherent impact signal generated by the pump drive unit at the moment of reciprocating commutation in real time, and to correct the phase offset parameter based on the propagation delay of the inherent impact signal between different pipeline monitoring nodes.

[0011] Preferably, the frequency of the sinusoidal disturbance signal is Hz to Hz, and the pressure amplitude fluctuation caused by the sinusoidal disturbance signal is less than the reference operating pressure corresponding to the reference operating frequency. The central control unit is also used to monitor the output power residual component of the pumping drive unit, and to identify the resonance range of the pipeline network based on the fluctuation frequency of the output power residual component, and to avoid the resonance range by finely adjusting the frequency of the sinusoidal disturbance signal.

[0012] Preferably, the slope of the pressure rise edge of the asymmetric pressure pulse is equal to the rated maximum pressure of the pump unit. to The central control unit is used to linearly adjust the pulse width of the asymmetric pressure pulse according to the rate of change of the phase offset parameter, and to increase the duration of the asymmetric pressure pulse when the rate of change increases.

[0013] Preferably, the central control unit is also used to control the frequency of the flutter signal to increase linearly with time during the output of the flutter signal, so that the frequency sweep range of the flutter signal covers the rheological resonant frequency of the slurry at the current flow rate.

[0014] Preferably, the sinusoidal disturbance signal includes a main disturbance signal and harmonic disturbance signals that have a frequency multiple relationship with it; the central control unit is used to adjust the initial phase of the main disturbance signal and the harmonic disturbance signal according to the installation position of each node in the pipeline sensing unit, so that the main disturbance signal and the harmonic disturbance signal produce a physical superposition enhancement effect at each pipeline monitoring node; the central control unit is also used to extract the beat frequency envelope characteristics of the response pressure waveform. ,in, In the formula and These represent the frequencies of the main disturbance signal and the harmonic disturbance signal, respectively.

[0015] Preferably, the central control unit is used to extract the motor load characteristics of the pumping drive unit when the phase offset parameter feedback is interrupted, and to determine the fluid cavitation state of the vertical section of the pipeline based on the motor load characteristics; when the fluid cavitation state is identified, the central control unit is used to control the pumping drive unit to output micro inertial pulse signals, so as to utilize the inertia of the slurry to build hydraulic back pressure in the pipeline network.

[0016] Preferably, the system further includes a pulping unit, and the central control unit is used to control the superposition frequency of the pulping unit during pulp mixing. The cyclic perturbation signal causes the slurry concentration to carry ripple characteristics in the time domain; the central control unit is used to separate the phase offset parameter from the frequency. The associated intrinsic rheological offset value is used to determine the metastable deposition stage based on the phase offset residual after removing the intrinsic rheological offset value.

[0017] Preferably, the central control unit is also used to analyze the residual fluctuation frequency in the phase offset parameters; the central control unit is used to output a stiffness degradation warning signal for the pipeline support structure when the residual fluctuation frequency shifts to the low frequency range and the shift exceeds the preset shift threshold.

[0018] Preferably, the pipeline sensing unit includes a pressure sensor array, in which pressure sensors are respectively installed at the beginning, bend, and end of the pipeline; the central control unit is used to extract the time difference between the arrival of the inherent impact signal at two adjacent pressure sensors, and calculate the actual wave propagation velocity of the slurry accordingly to calibrate the phase offset parameter.

[0019] Preferably, the central control unit is used to monitor the phase offset parameter in continuous The standard deviation within each pumping stroke; the central control unit is used to output control commands to adjust the drag-reducing agent addition ratio in the pulping unit when the standard deviation exceeds the preset stability threshold.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] 1. In the treatment of goaf in underground mines, the pumping reference frequency is superimposed with periodic disturbance signals, and pressure waves are transmitted by slurry trains. The evolution of the flow state of the pipe wall boundary layer is characterized by analyzing the phase shift parameters of the pipeline node response. In response to the static arching trend of high solids content non-Newtonian fluids in the low shear zone, flow resistance anomalies are identified in the metastable deposition stage before the pipeline outlet pressure fluctuates, avoiding pressure threshold monitoring response lag and maintaining the continuity of underground filling operations.

[0022] 2. After determining that the phase offset parameter is abnormal, a high-frequency flutter signal is output to reduce the yield stress of the sediment. Then, an asymmetric pressure pulse with a rising slope greater than the falling slope is output. The fluid inertia induces a non-equilibrium shear force field at the sediment interface, causing the sediment attached to the pipe wall to be dissociated layer by layer and resuspended into the mainstream field. The sediment is first physically softened and then energy stripped, reducing the instantaneous peak pressure during the unblocking process. This mitigates the instantaneous shear impact of pressure changes on the welded parts and support structure of the downhole pipeline, ensuring the structural safety of the pipeline network under high-throughput transportation conditions.

[0023] 3. Extract the inherent impact signal generated at the moment of stroke switching of the pump drive unit, calculate the propagation delay of the signal between different pipeline nodes, and use it to correct the logic zero point of the phase offset parameter. Construct a reference system using the actuator operating characteristics to compensate for the wave propagation velocity drift caused by fluctuations in downhole ambient temperature and slurry concentration. Under the premise of using a pressure sensing array, eliminate the interference of medium property changes on the blockage identification logic, maintain monitoring accuracy, and reduce operation calibration costs. In the slurry preparation stage, control the stirring mechanism to inject circulating micro-perturbations into the slurry, so that the slurry concentration carries ripple characteristics in the time domain. In the pumping analysis stage, separate the intrinsic rheological offset value caused by concentration drift through differential frequency information decoupling technology. The identification effect generated by multi-process linkage enables the asymmetric pressure pulse to be triggered when the actual blockage precursor occurs, avoiding the disturbance of the internal structure of high-concentration slurry caused by the slurry preparation fluctuation falsely triggered pulse waves, and ensuring the physical strength homogeneity of the goaf filling body. Attached Figure Description

[0024] Figure 1 This is a flowchart of the active monitoring and closed-loop unblocking control of the pumping system of the present invention;

[0025] Figure 2 This is an experimental comparison of deposition thickness and metastable state identification performance under different operating conditions according to the present invention;

[0026] Figure 3 This is a schematic diagram of the hardware control architecture and multi-unit signal interaction principle of the system of the present invention. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. This part is intended to explain the present invention and is not intended to limit the scope of protection of the present invention.

[0028] A continuous pumping system for high-throughput slurry used in underground goaf remediation includes a pumping drive unit, a pipeline sensing unit, and a central control unit. The pumping drive unit employs a variable frequency drive pump set to transport high-solids-content slurry to the underground goaf. The pipeline sensing unit includes an array of pressure sensors installed at the beginning, bends, and ends of the pipeline to collect response pressure waveforms at specific nodes. The central control unit is electrically connected to the pumping drive unit and the pipeline sensing unit and is used to adjust the pumping state through logic commands. Addressing the problem of aggregate deposition induced by low shear fields near the wall in long-distance transport of high-solids-content non-Newtonian fluids, and the lag in conventional pressure threshold monitoring, the system employs an active feature loading method for flow regime identification. The central control unit controls the pumping drive unit at a reference operating frequency. The superposition frequency is Hz to A sinusoidal disturbance signal of Hz causes pressure amplitude fluctuations that are smaller than those at the reference operating frequency. Corresponding to the reference operating pressure Through frequency superposition, the slurry train in the pipeline network forms a pressure disturbance wave carrying phase characteristics; the pipeline sensing unit captures the response pressure waveform of each node in the pipeline in real time, and the central control unit extracts the phase offset parameter of the response pressure waveform relative to the sinusoidal disturbance signal. Monitor the evolution of pipeline rheological properties, when the phase shift parameter rate of change When the phase change rate continuously exceeds the preset threshold, the system determines that the pipeline monitoring node is in the metastable deposition stage. This stage indicates that preliminary deposits have formed in the pipe wall boundary layer, causing a shift in the equivalent stiffness of the fluid train. During the initialization stage, the pump drive unit performs a frequency step scan, the pipeline sensing unit collects the response waveforms of each pressure monitoring node, and the central control unit uses a length... The sampling point window performs discrete cross-correlation calculations to extract the inherent phase offset matrix of the current pipeline structure and calculates the standard deviation of the sampling sequence in the matrix. Set the phase change rate threshold Set as confidence coefficient with standard deviation Product, confidence coefficient Values ​​are determined based on the ambient noise level at the site. to Eliminate interference from pipeline topology and slurry static rheological substrate.

[0029] To remove deposits without causing pipe blockage, the central control unit switches the output mode of the pump drive unit after determining the metastable deposition stage. The system controls the pump drive unit to output a dithering signal of a preset duration. The frequency of the dithering signal increases linearly with time, so that the frequency sweep range covers the rheological resonant frequency of the slurry at the current flow rate. This high-frequency micro-amplitude fluctuation utilizes the shear-thinning properties of the slurry to reduce the interfacial cohesion between the deposits and the inner wall of the pipe. The central control unit calculates the shear rate at the pipe wall based on real-time collected pump flow rate and slurry concentration parameters, and determines the center point of the rheological resonant frequency by consulting a pre-stored non-Newtonian fluid dynamic viscosity table. Control the frequency converter in to Range-based frequency sweep output, sweep step rate The frequency pulse is negatively correlated with the slurry consistency coefficient. The duration of each frequency pulse at the deposition layer interface covers the relaxation time required for the interparticle force chain to break. High-frequency micro-amplitude vibration induces shear thinning of the slurry at the interface, reducing the interfacial cohesion between the deposition layer and the inner wall of the pipe to below a set threshold. The system outputs an asymmetric pressure pulse with a rising slope greater than the falling slope. The rising slope of the asymmetric pressure pulse is equal to the rated maximum pressure of the pump unit. to The system utilizes fluid inertia to generate unbalanced shear forces at the softened interface, causing deposits to peel off from the pipe wall towards the center of the flow field. Furthermore, to address the acoustic drift caused by fluctuations in the downhole environment, the system performs a real-time calibration procedure. The central control unit extracts the inherent impact signal generated by the pump drive unit at the moment of stroke switching and obtains the time difference between the arrival of this signal at two adjacent pressure sensors. Calculate the actual wave velocity of the slurry according to the formula. ; The known physical distance between two adjacent pressure sensors. To mitigate propagation delay, the central control unit calculates the wave velocity in real time. Corrected phase offset parameters The calculation benchmark compensates for signal deviations caused by changes in slurry concentration or ambient temperature; the central control unit uses a sampling frequency of not less than The pressure transmitter captures the shock wave generated at the moment of commutation of the pump drive unit, uses a first-order differential operator to identify the shock wave's onset edge timescale information, and calculates the time difference between the shock wave's arrival at adjacent pressure sensors. Combined with the physical distance between sensors Calculate the actual wave velocity of the slurry According to wave speed Real-time changes in phase offset parameters Dynamic compensation eliminates propagation time delay deviations caused by fluctuations in downhole ambient temperature or changes in slurry concentration.

[0030] To address the signal attenuation problem in long-distance transmission, the sinusoidal disturbance signal includes a primary disturbance signal and harmonic disturbance signals with frequency multiples thereof. The central control unit adjusts the initial phase of the primary and harmonic disturbance signals according to the physical location of the sensor nodes, so that the two produce a physical superposition enhancement effect at specific monitoring nodes. At the same time, the central control unit extracts the beat frequency envelope characteristics of the response pressure waveform. : ,in, and These represent the frequencies of the primary disturbance signal and the harmonic disturbance signal, respectively. This characteristic is used to identify abnormal pipeline resistance. For the vertical fluid cavitation phenomenon that occurs in high-drop transport, the central control unit adjusts the phase offset parameter... When feedback is interrupted, the motor load characteristics of the pump drive unit are extracted. If a sudden decrease in amplitude is detected corresponding to a voiding state in the motor load characteristics, the system controls the pump drive unit to output a micro-inertial pulse signal. This utilizes the slurry inertia to create hydraulic back pressure within the pipe network, closing the fluid voiding zone, ensuring the continuity of the detected medium, and suppressing water hammer effects. To further strengthen the identification logic, the central control unit monitors the motor current signal of the pump motor. Current prediction value corresponding to the continuous flow state at the current pumping frequency The absolute value of the difference between them determines the current residual component. When the current residual component Continuously exceeding the rated current At that time, the system triggers a micro-inertial pulse procedure; the system also includes a pulping unit, and the central control unit controls the pulping unit to superimpose a frequency of [frequency value] during pulp mixing. The cyclic perturbation signal causes the slurry concentration to carry specific fluctuation characteristics in the time domain. The central control unit separates the frequency-related parameters from the total phase offset parameter. The associated intrinsic rheological offset value is used, and the metastable deposition stage is determined based on the phase offset residual after removing the offset value. This method isolates the interference of pulp concentration fluctuations on the blockage determination logic. In terms of pipeline safety assurance, the central control unit analyzes the phase offset parameters. If the residual fluctuation frequency shifts to a lower frequency range and the shift exceeds a preset shift threshold, it indicates a change in the mechanical impedance of the pipeline support system. The system then outputs an early warning signal for stiffness degradation of the pipeline support structure. During system operation, when a phase shift parameter is detected... When the fluctuation exceeds the preset range, the central control unit sends a control command to the pulping unit to adjust the addition ratio of drag-reducing agent and help maintain pipeline unobstructed flow by optimizing the rheological properties of the slurry.

[0031] Example 1: When the conveying distance exceeds meters and vertical drop reached In a deep mine filling operation scenario, the system delivers a mass concentration of [missing information]. In coal gangue slurry, due to the low shear rate at the pipe wall boundary layer and the coupling effect of pipe friction resistance and slurry yield stress, aggregate settling occurs in the near-wall region of the pipe. If a constant flow pumping method is used, the outlet pressure monitoring method cannot capture effective resistance fluctuation signals in the early stage of sediment thickness increase. This leads to a hidden risk state in which the sediment continues to thicken and spreads towards the central axis of the pipe. The central control unit controls the pumping drive unit at the reference operating frequency. for Based on Hz, the loading frequency is A sinusoidal disturbance signal of Hz is used. The slight elastic deformation of the slurry train under the pressure wave carries rheological information reflecting the equivalent impedance of the pipeline. The pipeline sensing unit collects the response pressure waveform of the pressure sensor located at the intersection of the horizontal branch pipe. The central control unit extracts the phase offset parameter of this waveform relative to the excitation signal at the starting end. Monitoring revealed this phase shift parameter In continuous The pumping stroke exhibits a non-linear growth trend, and its rate of change... achieve If the temperature changes by more than a preset phase change rate threshold per minute, it is determined that the pipeline has entered a metastable deposition stage.

[0032] To resolve the conflict between the increased pumping pressure leading to sediment compaction and the high momentum required for clearing blockages, the central control unit instructs the pump drive unit to switch its output mode, initially outputting a signal for a duration of [duration missing]. A sweep frequency jitter signal with a frequency of 1 second, its frequency is determined by Hz linear boost to Hz, utilizing high-frequency micro-amplitude vibration to induce shear thinning of the slurry at the sediment interface, weakening the adhesion strength between the sediment layer and the inner wall of the pipe. The central control unit instructs the pump drive unit to output an asymmetric pressure pulse with a rising edge slope greater than the falling edge slope, wherein the pressure rising edge slope is set to the pump set's rated maximum pressure. The system utilizes the instantaneous momentum transfer generated by the fluid during the rising phase to strip the softened sediment from the boundary layer; after being scoured by asymmetric pressure pulses, the central control unit monitors the phase shift parameters. Gradually returning to the baseline value and with the rate of change approaching zero, it indicates that the flow cross-section of the pipeline inner wall has returned to its initial state. Since the system identifies and removes abnormal flow resistance through phase characteristics in the early stage of sediment formation, the pump outlet pressure is kept below the safety threshold throughout the entire adjustment process, avoiding the risk of high-pressure pipe burst caused by pipeline blockage. The system ensures the continuous progress of filling operations by changing the pressure monitoring mode to a rheological state monitoring method based on active phase perturbation.

[0033] Example 2: In the simulated conveying distance of Rice and includes Place On the industrial test platform for the elbow, by injecting water into the pipeline with mass concentrations of... , as well as Three groups of coal gangue slurries were used to simulate the flow state of slurry trains during long-distance transportation under deep mine filling conditions. The experiment aimed to quantitatively verify the system's accuracy in identifying pipeline resistance anomalies under different deposition loads. The pipeline sensing unit adopted a measurement accuracy of [missing information]. And the sampling frequency is The Hz pressure sensor, designed to simulate real high-frequency mechanical vibration interference downhole, actively superimposes a signal-to-noise ratio of 1.5 Hz into the acquired pressure signal. dB of Gaussian white noise, where the setting of the sampling period balances the constraints between phase resolution and the computational load of the central control unit, for the highest frequency of A sinusoidal perturbation signal of Hz anchors the sampling frequency at Hz. Hz to ensure the extracted phase offset parameters It has sufficient discrete points within the disturbance period; the sample of the present invention executes a determined operating procedure to achieve the reference operating frequency of the pumping drive unit. Set as Hz and a frequency superimposed on it is The control group was pumped at a constant frequency, while the control group was pumped at a constant frequency. The cross-sectional contraction process caused by local metastable deposition was simulated by adjusting the opening of the throttle valve at the outlet of the circulating pump. The monitoring indicators and logical judgment results of different groups under different concentration gradients were recorded in the experiment. See Table 1 for the comparison data.

[0034] Table 1: Comparison of Flow Characteristic Monitoring and Identification Results of Different Samples under Different Working Conditions

[0035]

[0036] According to the data in Table 1, when the slurry mass concentration is... Under typical operating conditions, control group 2 achieved a deposition thickness of [missing information]. When mm, the amplitude of export pressure fluctuations remains at Within MPa, the pressure alarm mechanism of the existing system was not triggered, while sample group 2 of the present invention, with a deposition thickness of only MPa, was not triggered. In the initial stage of mm, the phase offset parameters captured by the system Accumulated to Degree, and its rate of change The waveform exhibits a clear nonlinear growth characteristic, confirming that the superimposed sinusoidal disturbance wave has a high sensitivity to changes in the equivalent acoustic impedance inside the pipeline. Furthermore, the out-of-range control group 1 sets the sinusoidal disturbance frequency to [value missing]. Hz, because the frequency is too low, the phase accumulation is not obvious, and the rate of change is only The degree per minute makes its eigenvalues ​​indistinguishable from measurement noise, while the partial removal of harmonic self-reinforcing interference logic from group 1 leads to superposition... Signal extraction is interrupted under dB noise conditions; as the slurry concentration increases from dB... Increase to Phase offset change rate It exhibits a monotonically increasing trend related to yield stress, and the data shows the existence of a performance inflection point when the mass concentration exceeds... At that time, due to the sharp increase in internal frictional resistance of the slurry, the pressure disturbance wave undergoes broadband attenuation, and the phase shift parameter... The growth rate of the phase shift parameter gradually slows down. At this point, the system adds drag-reducing agent to the slurry through the slurry preparation unit and monitors the phase shift parameter. Gradually regressing to the logic zero point, this result indicates that the system can perform closed-loop correction of the pumping state based on quantified rheological parameters.

[0037] Example 3: This example combines Figures 1 to 3 A description of a continuous pumping system for high-throughput slurry used in the treatment of underground goaf areas, such as... Figure 1 As shown, the system operation logic begins in the normal pumping and monitoring phase. In this phase, the reference frequency pumping is started and a sinusoidal disturbance signal is superimposed to extract the phase parameters. At the same time, the wave velocity reference is corrected by the commutation impact. Then, the logic judgment link is entered to determine whether the phase change rate exceeds the threshold. If the judgment result is negative, the normal pumping and monitoring steps are returned to maintain the loop via the continued monitoring path. If the judgment result is positive, it is identified as metastable and enters the high-frequency flutter softening phase. In this phase, the flutter mode is switched and a linearly increasing sweep frequency signal is output until the preset duration is reached. After the softening is completed, the asymmetric pulse stripping step is connected. The deposit layer is stripped by inertia by outputting a steep rising edge pulse. Finally, after the blockage is cleared or the reference is returned, the system returns to the initial monitoring phase. In addition, when the signal interruption or load drop condition is triggered, the logic flow enters the fluid de-cavitation treatment branch. The hydraulic back pressure is constructed by outputting micro-inertial pulses. After the back pressure is established, the system is reconnected to the main monitoring loop.

[0038] like Figure 2As shown in the figure, the horizontal axis represents four experimental sample groups: sample group 1 (72%), sample group 2 (78%), sample group 3 (83%), and control group 2 (78%). The left vertical axis represents the deposition thickness in mm. The right vertical axis and the grid-filled bar chart represent the recognition status, divided into two levels: identifiable and unidentifiable, corresponding to the deposition thickness values. The data shows that sample group 1 was identifiable at a deposition thickness of 2.1 mm, sample group 2 remained identifiable at a deposition thickness of 2.3 mm, and sample group 3 was also identifiable at a deposition thickness of 2.2 mm. However, control group 2 remained unidentifiable even at a deposition thickness of 4.1 mm. Figure 3 As shown, the system's hardware architecture is centered on a central control unit, which integrates core algorithms and decision-making modules. Specifically, it covers phase shift analysis, unblocking strategy generation, and wave velocity drift correction functions. The central control unit connects to the intelligent pulping station on the left, issues concentration perturbation commands, and controls it to load cyclic perturbations. The intelligent pulping station connects to the variable frequency pumping station on the right through the slurry supply path. The central control unit interacts with the variable frequency pumping station on the right with frequency superposition and unblocking commands, controlling the station to execute sinusoidal perturbation superposition and asymmetric pulse output. The variable frequency pumping station is connected to the sensing network at the bottom through a high-throughput delivery pipeline. The sensing network includes a starting sensor for reference waveform acquisition, an ending sensor for echo feature extraction, and a bend monitoring point located in the metastable deposition high-incidence area. The above sensors transmit signals back to the central control unit through a pressure waveform feedback link.

[0039] Example 4: In the parameter initialization scenario before the mine filling system is officially put into operation, to eliminate the nonlinear phase noise caused by differences in pipeline laying paths, number of bends, and slurry formulations, a parameter calibration procedure based on physical references is executed. The central control unit drives the pump drive unit to output a set of step frequency signals under static conditions where the pipeline network is filled with reference concentration slurry. The frequency range is [missing information]. Hz to Hz, step interval set to Hz, the pipeline sensing unit collects pressure waveform data from each monitoring node, and the central control unit uses a length of The sliding window at each sampling point performs discrete cross-correlation calculation on the waveform data to extract the inherent phase offset matrix corresponding to the current pipeline topology. The central control unit calculates the standard deviation of each sampling sequence within the inherent phase offset matrix. And set the phase change rate threshold Anchored to confidence coefficient with standard deviation The product; The confidence level coefficient is set to [value] under the current mining environment. .

[0040] To address the rheological hysteresis characteristics of high-solids-content slurry under shear force, the system performs physical modeling of key motion parameters during the unblocking execution phase. When the central control unit detects the phase shift parameter... rate of change Continuously exceeding the phase change rate threshold At that time, the system calculates the flutter frequency step rate. Frequency step rate The value of is negatively correlated with the consistency coefficient of the slurry. In the specific unblocking process, for a mass concentration of , The coal gangue slurry system is set to a frequency sweeping dithering signal in within seconds by Hz linear boost to Hz, the sweep step frequency is determined to be Hz per second. This value ensures that the residence time of each frequency pulse at the sediment interface is sufficient to cover the relaxation time required for the breakage of the interparticle force chain. When the amplitude regression rate of the response signal reaches the preset softening judgment threshold, the system connects to the output with a rising edge slope of the pump's rated maximum pressure. The asymmetric pressure pulse utilizes the instantaneous momentum transfer of the fluid to peel away the softened deposition layer from the boundary layer. After verification through the aforementioned initialization calibration and dynamic parameter validation procedures, the system, when handling simulated high-intensity deposition challenges, significantly reduces the error in sensing and identifying deposition thickness compared to the conventional pressure threshold method. mm reduced to mm, by introducing compensation logic based on the inherent phase offset array, the phase offset parameter Measurement repeatability error controlled within within degrees.

[0041] Example 5: At the newly deployed filling site, considering the rheological differences caused by specific pipe diameters and the ratios of coal gangue and fly ash, the system performs a calibration procedure before full-load transportation. The central control unit drives the pumping unit to sequentially inject clean water and the slurry to be transported into the pipeline network. The pipeline sensing unit collects and extracts the attenuation coefficient of the detection signal per unit length. and acoustic impedance reference value ;in, This represents the attenuation per unit length, expressed in dB / m. The characteristic impedance of the flow field; for a mass concentration of The measured attenuation coefficient of the slurry is dB / m, the central control unit establishes a gain compensation table for the current physical link based on the aforementioned attenuation characteristics, and compares the collected pressure response amplitude with this gain compensation table to align the sensitivity of the sensor nodes. This procedure maintains the uniformity of phase detection signal strength under different pipeline layouts; when the system faces pipe wall wear or stress relaxation of the supporting structure caused by long-term high-pressure scouring, the central control unit operates... The structural impedance is checked once every hour. The system applies a frequency of [frequency value] through the pump drive unit under zero load. Hz to The Hz sweep excitation wave is used by the pipeline sensing unit to capture the resonant frequency of the pipeline support structure. ;in, The inherent response frequency of the structure, in Hz; the central control unit will capture it in real time. Perform a difference operation with the original frequency recorded during the initialization phase. If it is detected... From the initial stage of production Hz offset to Hz, the central control unit corrects the phase offset parameters based on the frequency offset. The calculation benchmark, and the phase change rate threshold. Based on real-time calculation of structural damping changes and dynamic step compensation, this procedure maintains the accuracy of the identification algorithm when the physical state of the pipeline network changes.

[0042] At a vertical height of In deep mine backfilling deployment scenarios involving multiple stepped vertical pipelines, the system performs pressure sensor position calibration based on wavelength sampling criteria to eliminate the aliasing characteristics of pressure disturbance waves in the spatiotemporal dimensions. The central control unit then determines the location based on the slurry reference wave velocity. and the highest frequency of the sinusoidal disturbance signal Calculate the spatial step size of the pressure monitoring node ;in, The wave velocity is determined by the initialization procedure, in m / s. The upper frequency limit of the sinusoidal disturbance signal is set to a value of [value missing]. Hz; The central control unit sets the physical installation distance between two adjacent pressure sensors to be less than or equal to 100 Hz. and The product of these factors necessitates ensuring that the pressure response signal captured by the pipeline sensing unit satisfies the sampling theorem in the spatial domain, thus maximizing the phase offset parameter. The calculation results can distinguish the sudden change in local acoustic impedance caused by pipe bends; when the system identifies that the pressure in the vertical pipe section drops below the local saturated vapor pressure and the current pulsation amplitude corresponding to the motor load characteristics drops to the no-load level. At that time, the central control unit executes a pulse intensity adaptation procedure based on hydrostatic pressure compensation, and the system adjusts the pulse intensity according to the vertical segment height difference. and slurry density Adjusting the peak pressure of the micro-inertial pulse signal ;in, The vertical drop is expressed in meters (m). The mass density of the slurry is expressed in kg / m³; the output amplitude of the pump drive unit controlled by the central control unit is... The pulse sequence utilizes the momentum superposition effect to create upward back pressure in the vertical pipeline section, thereby closing the fluid vacancy zone until the phase shift parameter is captured by the pipeline sensing unit. Recover continuous temporal characteristics.

[0043] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A continuous pumping system of high flux slurry for gob area treatment in a mine, comprising a pumping drive unit, a pipe network sensing unit and a central control unit, characterized in that, The system follows these operating rules: The central control unit is configured to control the pumping drive unit to superimpose a sinusoidal perturbation signal having a frequency of Hz to Hz on a reference operating frequency of the pumping drive unit to cause the slurry column within the pipe network to form a pressure perturbation carrying phase characteristics; The pipeline sensing unit is used to collect the response pressure waveforms of pipeline monitoring nodes in the pipeline network; The central control unit is used to extract the phase offset parameter of the response pressure waveform relative to the sinusoidal disturbance signal, and when the rate of change of the phase offset parameter continues to exceed the preset phase change rate threshold, it determines that the pipeline monitoring node is in the metastable deposition stage. The central control unit is used to switch the output mode of the pumping drive unit after determining that the metastable deposition stage has been reached. First, it controls the pumping drive unit to output a flutter signal of a preset duration, which uses the shear thinning characteristics of the slurry to reduce the interfacial cohesion between the sediment and the inner wall of the pipe network during the metastable deposition stage. Then, it connects to output an asymmetric pressure pulse with a rising slope greater than a falling slope, which uses fluid inertia to generate an unbalanced shear force at the softened interface to peel off the sediment. The central control unit is also used to extract the inherent impact signal generated by the pump drive unit at the moment of reciprocating commutation in real time, and to correct the phase offset parameter based on the propagation delay of the inherent impact signal between different pipeline monitoring nodes.

2. The continuous pumping system for high-throughput slurry in underground goaf treatment according to claim 1, characterized in that, The frequency of the sinusoidal disturbance signal is Hz to Hz, and the pressure amplitude fluctuation caused by the sinusoidal disturbance signal is less than the reference operating pressure corresponding to the reference operating frequency. The central control unit is also used to monitor the output power residual component of the pumping drive unit, and to identify the resonance range of the pipeline network based on the fluctuation frequency of the output power residual component, and to avoid the resonance range by finely adjusting the frequency of the sinusoidal disturbance signal.

3. The continuous pumping system for high-throughput slurry in underground goaf treatment according to claim 1, characterized in that, The slope of the pressure rise of the asymmetric pressure pulse is equal to the rated maximum pressure of the pump unit. to ; The central control unit is used to linearly adjust the pulse width of the asymmetric pressure pulse according to the rate of change of the phase offset parameter, and to increase the duration of the asymmetric pressure pulse when the rate of change increases.

4. The continuous pumping system for high-throughput slurry in underground goaf treatment according to claim 1, characterized in that, The central control unit is also used to control the frequency of the flutter signal to increase linearly with time during the output flutter signal, so that the frequency sweep range of the flutter signal covers the rheological resonant frequency of the slurry at the current flow rate.

5. A continuous pumping system for high-throughput slurry in underground goaf treatment according to claim 1, characterized in that, The sinusoidal disturbance signal includes a primary disturbance signal and harmonic disturbance signals that have a frequency multiple relationship with it. The central control unit is used to adjust the initial phase of the primary disturbance signal and the harmonic disturbance signal according to the installation position of each node in the pipeline sensing unit, so that the primary disturbance signal and the harmonic disturbance signal produce a physical superposition enhancement effect at each pipeline monitoring node. The central control unit is also used to extract the beat frequency envelope characteristics of the response pressure waveform. ,in, In the formula and These represent the frequencies of the main disturbance signal and the harmonic disturbance signal, respectively.

6. A continuous pumping system for high-throughput slurry in underground goaf treatment according to claim 1, characterized in that, The central control unit is used to extract the motor load characteristics of the pumping drive unit when the phase offset parameter feedback is interrupted, and to determine the fluid cavitation state of the vertical section of the pipeline based on the motor load characteristics; when the fluid cavitation state is detected, the central control unit is used to control the pumping drive unit to output micro inertial pulse signals, and to use the inertia of the slurry to build hydraulic back pressure in the pipeline network.

7. A continuous pumping system for high-throughput slurry in underground goaf treatment according to claim 1, characterized in that, The system also includes a pulping unit, and the central control unit is used to control the superposition frequency of the pulping unit during pulp mixing. The cyclic perturbation signal causes the slurry concentration to carry ripple characteristics in the time domain; the central control unit is used to separate the phase offset parameter from the frequency. The associated intrinsic rheological offset value is used to determine the metastable deposition stage based on the phase offset residual after removing the intrinsic rheological offset value.

8. A continuous pumping system for high-throughput slurry in underground goaf treatment according to claim 1, characterized in that, The central control unit is also used to analyze the residual fluctuation frequency in the phase offset parameters; when the residual fluctuation frequency shifts to the low frequency range and the shift exceeds the preset offset threshold, the central control unit outputs an early warning signal for stiffness degradation of the pipeline support structure.

9. A continuous pumping system for high-throughput slurry in underground goaf treatment according to claim 1, characterized in that, The pipeline sensing unit includes a pressure sensor array, in which pressure sensors are installed at the beginning, bend, and end of the pipeline. The central control unit is used to extract the time difference between the arrival of the inherent impact signal at two adjacent pressure sensors and calculate the actual wave propagation velocity of the slurry to calibrate the phase offset parameter.

10. A continuous pumping system for high-throughput slurry in underground goaf treatment according to claim 1, characterized in that, The central control unit is used to monitor the phase offset parameters in continuous The standard deviation within each pumping stroke; the central control unit is used to output control commands to adjust the drag-reducing agent addition ratio in the pulping unit when the standard deviation exceeds the preset stability threshold.

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