CN-121976848-A - Continuous pumping system of high flux slurry for treating underground goaf

CN121976848ACN 121976848 ACN121976848 ACN 121976848ACN-121976848-A

Abstract

The invention relates to the technical field of mine filling and discloses a continuous pumping system of high-flux slurry for underground goaf treatment, which comprises a pumping driving unit, a pipe network sensing unit and a central control unit, wherein a sinusoidal disturbance signal is superposed on a pumping reference frequency through the central control unit to construct a pressure disturbance wave carrying phase characteristics, a phase shift parameter of a pipe network response waveform is extracted, a pipeline is identified to be in a metastable state deposition stage when the change rate of the phase shift parameter exceeds a threshold value, a flutter signal is output to induce sediment interface softening and is connected with an asymmetric pressure pulse with a rising edge slope larger than a falling edge slope to strip sediment, and a pump head stroke switching instant impact signal is utilized to correct wave speed drift.

Inventors

LI HONGBO
WU DONGLIANG
LI ZHEN
OU YUQING

Assignees

湖南普泰充填矿山设备有限公司

Dates

Publication Date: 20260505
Application Date: 20260407

Claims (10)

1. The continuous pumping system of the high-flux slurry for the underground goaf treatment comprises a pumping driving unit, a pipe network sensing unit and a central control unit, and is characterized in that the system follows the following operation rules: the central control unit is used for controlling the pump driving unit to superimpose the frequency on the reference operating frequency to be Hz to A sinusoidal disturbance signal of Hz to form a slurry column in the pipe network into a pressure disturbance carrying a phase characteristic; The pipe network sensing unit is used for collecting response pressure waveforms of the pipeline monitoring nodes in the pipe network; The central control unit is used for extracting phase deviation parameters of response pressure waveforms relative to sinusoidal disturbance signals, and judging that the pipeline monitoring node is in a metastable state deposition stage when the change rate of the phase deviation parameters continuously exceeds a preset phase change rate threshold value; The central control unit is used for switching the output mode of the pumping driving unit after judging the metastable state deposition stage, firstly controlling the pumping driving unit to output a flutter signal with preset time length, reducing the interfacial cohesive force between the sediment in the metastable state deposition stage and the inner wall surface of the pipe network by utilizing the shear thinning characteristic of slurry, then connecting and outputting an asymmetric pressure pulse with the rising edge slope being larger than the falling edge slope, and generating an unbalanced shearing force on the softened interface by utilizing the fluid inertia so as to strip the sediment; The central control unit is also used for extracting the inherent impact signals generated by the pumping driving unit at the moment of reciprocating reversing in real time and correcting the phase deviation parameters according to the propagation delay of the inherent impact signals among different pipeline monitoring nodes.
2. A continuous pumping system of high throughput slurry for downhole goaf management as claimed in claim 1, wherein the sinusoidal disturbance signal has a frequency of Hz to Hz, and the pressure amplitude fluctuation caused by the sinusoidal disturbance signal is smaller than the reference operating pressure corresponding to the reference operating frequency The central control unit is also used for monitoring the residual component of the output power of the pumping driving unit, identifying the resonance section of the pipe network according to the fluctuation frequency of the residual component of the output power, and avoiding the resonance section by fine-tuning the frequency of the sinusoidal disturbance signal.
3. A continuous pumping system of high throughput slurry for downhole goaf management as claimed in claim 1, wherein the pressure rising edge slope of the asymmetric pressure pulse is the highest pressure rating of the pump stack To the point of The central control unit is used for linearly adjusting the pulse width of the asymmetric pressure pulse according to the change rate of the phase shift parameter and increasing the duration of the asymmetric pressure pulse when the change rate is increased.
4. A continuous pumping system of high throughput slurry for downhole goaf remediation according to claim 1 wherein the central control unit is further adapted to control the frequency of the dither signal to linearly increase with time during the outputting of the dither signal such that the swept frequency range of the dither signal encompasses the rheological resonant frequency of the slurry at the current flow rate.
5. The continuous pumping system of high-throughput slurry for underground goaf treatment according to claim 1, wherein the sinusoidal disturbance signals comprise main disturbance signals and harmonic disturbance signals with frequency multiple relation, the central control unit is used for adjusting initial phases of the main disturbance signals and the harmonic disturbance signals according to installation positions of nodes in the pipe network sensing unit so that the main disturbance signals and the harmonic disturbance signals generate physical superposition enhancement effects at each pipeline monitoring node, and the central control unit is further used for extracting beat frequency envelope characteristics of response pressure waveforms , wherein, In the following And (3) with Representing the frequencies of the main disturbance signal and the harmonic disturbance signal, respectively.
6. The continuous pumping system of high-flux slurry for underground goaf treatment according to claim 1, wherein the central control unit is used for extracting motor load characteristics of the pumping driving unit when feedback of phase deviation parameters is interrupted, judging a fluid emptying state of a vertical section of a pipeline according to the motor load characteristics, and controlling the pumping driving unit to output micro-inertia pulse signals when the fluid emptying state is identified, and constructing hydraulic back pressure in a pipe network by utilizing inertia of the slurry.
7. A continuous pumping system of high throughput slurry for downhole goaf management as claimed in claim 1, further comprising a pulping unit, the central control unit being adapted to control the pulping unit to superimpose the slurry at a frequency of The concentration of the slurry is carried with ripple characteristics in the time domain, and the central control unit is used for separating the phase deviation parameter from the frequency And performing metastable state deposition phase determination according to the phase shift residual after eliminating the intrinsic rheological shift value.
8. The continuous pumping system of high-throughput slurry for underground goaf management according to claim 1, wherein the central control unit is further configured to analyze residual fluctuation frequency in the phase shift parameter, and the central control unit is configured to output a stiffness degradation early warning signal for the pipe network support structure when the residual fluctuation frequency shifts to the low-frequency section and the shift amount exceeds a preset shift threshold.
9. The continuous pumping system of high-flux slurry for underground goaf treatment according to claim 1, wherein the pipe network sensing unit comprises a pressure sensor array, wherein the pressure sensors in the pressure sensor array are respectively arranged at a starting end, an elbow and an end of the pipe network, and the central control unit is used for extracting the time difference of arrival of an inherent impact signal at two adjacent pressure sensors and calculating the actual wave propagation speed of the slurry according to the time difference so as to calibrate the phase deviation parameter.
10. A continuous pumping system of high throughput slurry for downhole goaf management as claimed in claim 1, wherein the central control unit is adapted to monitor the phase shift parameter in a continuous manner And the central control unit is used for outputting a control instruction for adjusting the addition proportion of the drag reducer in the pulping unit when the standard deviation exceeds a preset stability threshold.

Description

Continuous pumping system of high flux slurry for treating underground goaf Technical Field The invention relates to a continuous pumping system of high-flux slurry for treating a goaf in a well, and belongs to the technical field of mine filling. Background The current mine goaf treatment utilizes a pipe network to convey cemented slurry to fill, a current mainstream scheme adopts a variable frequency drive pump set, the output frequency is regulated based on a constant flow or constant pressure criterion, the pumping process is maintained stable, the high-solid-content slurry has non-Newtonian fluid characteristics, the slurry is limited by shear thinning and yield stress in long-distance conveying, the shearing force of a pipe wall boundary layer is unevenly distributed, when pumping flux is lifted, a near-wall area low shear field causes coarse aggregate to deposit, a pipe wall filter cake is induced to thicken, and as the deposition evolution mainly generates a flow field edge, the flow state of a main channel in the center of the pipe is not changed, and an outlet pressure monitoring means cannot acquire signals at the initial stage of deposition, so as to generate a perception blind area. Although the hardware structure of the optimizing device can improve the automation degree, the control layer has insufficient dynamic sensing and active intervention capability aiming at the rheological property of a conveying medium, for example, the Chinese patent application with the publication number of CN109653791A discloses an underground intelligent gangue pumping and filling system of a coal mine, mechanical cooperation and flow automation are realized by integrating crushing, stirring and spraying hardware modules, the scheme focuses on passive cooperation of equipment, sensing logic focuses on macroscopic video monitoring or conventional pressure threshold judgment, an in-pipe fluid state evolution endogenous signal analysis mechanism is lacked, unstable flow of high-concentration slurry cannot capture weak abnormality of flow resistance, response delay is recognized, logic and slurry rheological property disconnection are performed, sediment is difficult to actively peel off through targeted disturbance on the premise of ensuring the safety of a pipe network structure, the pipeline resistance accumulation is aimed, the linear regulation mode for improving pumping pressure is easy to compact a sediment layer, irreversible embolism is generated, a detection path of external hardware such as a distributed sensor is paved, the hardware survival rate is low under the underground high corrosion and strong flushing environment, and maintenance cost is high. Therefore, how to utilize the endogenous signals of the pumping system to represent the pipeline flow state and construct a blockage removal mechanism adapting to the non-Newtonian fluid characteristics becomes the technical problem to be solved by the invention. Disclosure of Invention In order to solve the problems in the background technology, the technical scheme of the invention is as follows, the continuous pumping system of the high flux slurry for the treatment of the underground goaf comprises a pumping driving unit, a pipe network sensing unit and a central control unit, and the system follows the following operation rules: the central control unit is used for controlling the pump driving unit to superimpose the frequency on the reference operating frequency to be Hz toA sinusoidal disturbance signal of Hz to form a slurry column in the pipe network into a pressure disturbance carrying a phase characteristic; The pipe network sensing unit is used for collecting response pressure waveforms of the pipeline monitoring nodes in the pipe network; The central control unit is used for extracting phase deviation parameters of response pressure waveforms relative to sinusoidal disturbance signals, and judging that the pipeline monitoring node is in a metastable state deposition stage when the change rate of the phase deviation parameters continuously exceeds a preset phase change rate threshold value; The central control unit is used for switching the output mode of the pumping driving unit after judging the metastable state deposition stage, firstly controlling the pumping driving unit to output a flutter signal with preset time length, reducing the interfacial cohesive force between the sediment in the metastable state deposition stage and the inner wall surface of the pipe network by utilizing the shear thinning characteristic of slurry, then connecting and outputting an asymmetric pressure pulse with the rising edge slope being larger than the falling edge slope, and generating an unbalanced shearing force on the softened interface by utilizing the fluid inertia so as to strip the sediment; The central control unit is also used for extracting the inherent impact signals generated by the pumping driving unit at the moment of reciprocating reversing in r