CN-117547872-B - On-line chromatography monitoring system for tailing thickener

CN117547872BCN 117547872 BCN117547872 BCN 117547872BCN-117547872-B

Abstract

The invention discloses an online chromatographic monitoring system for a tailing thickener, which is used for realizing online monitoring of slurry in the thickener by installing an ultrasonic array and a data acquisition system provided by the invention on the inner wall of the thickener, realizing simultaneous transceiving of an ultrasonic sensor array by mutually matching a signal filter and a multiplexer, and realizing marking discrimination of a pulse chromatographic path and multi-frequency source chromatography by adopting a broadband ultrasonic transmitting probe and a receiving probe. After the acoustic characteristics of the slurry are calibrated, collecting multi-frequency source slurry chromatography data, establishing a slurry background sound velocity model based on low-frequency chromatography data, establishing a slurry disturbance sound velocity model based on high-frequency chromatography data, training the background sound velocity model and the disturbance sound velocity model of different frequency bands, establishing a reliable slurry chromatography image resolution improvement model, and finally obtaining a slurry super-resolution sound velocity model to realize fine monitoring of the internal running state of a thickener and the slurry thickening condition.

Inventors

LI SHUJIAN
LIU YINGHUI
WANG ZONGYONG
LIANG WEIZHANG
LI ZHENG
ZHANG BIN
WU HAO
HUANG JIE
YUAN MINGLI
PANG JIANTAO

Assignees

云南磷化集团有限公司
中南大学

Dates

Publication Date: 20260508
Application Date: 20231207

Claims (8)

1. The online chromatographic monitoring system for the tailing thickener is characterized by comprising hardware and computer equipment for running software, wherein the hardware refers to an integrated ultrasonic sensor array and a data acquisition system, the software running on the computer equipment refers to a matched data processing and chromatographic imaging algorithm, the hardware adopts a broadband ultrasonic transmitter, a receiver and a multiplexing technology to form a sensor array so as to realize rapid chromatography of thickener slurry, and the software comprises the steps of measuring the acoustic characteristics of slurry, collecting a multi-frequency source chromatographic signal, performing multi-frequency source mixed domain full waveform inversion imaging and performing deep learning-based chromatographic image super-resolution reconstruction so as to realize real-time monitoring of the running state of the thickener; the data processing and tomography algorithm is as follows: S1, measuring acoustic properties of slurry, namely measuring propagation speeds of ultrasonic waves with different frequencies in slurry with different concentrations by establishing a test device, and establishing a standard property database; S2, acquiring multi-frequency ultrasonic tomography data, and obtaining signal waveform, delay and amplitude basic data for inversion imaging by changing ultrasonic pulse frequency; s3, performing full waveform inversion imaging in a multi-frequency source mixed domain, and obtaining high-resolution and high-signal-to-noise ratio tomographic images based on different frequencies by adopting a full waveform inversion algorithm in the frequency source mixed domain; s4, deep learning of the super-resolution image, namely processing the tomographic images with different time sequences by adopting a convolutional neural network to obtain the super-resolution tomographic image, namely, a slurry super-resolution sound velocity model.
2. The online chromatography monitoring system for a tailings thickener of claim 1, wherein the integrated ultrasonic sensor array comprises a transmitting transducer array, a receiving transducer array, a signal filter, a multiplexer, a signal line, a power line and a direct current power supply, wherein the transmitting transducer array comprises a plurality of ultrasonic transmitting transducers which are integrated to the signal filter through the signal line, the receiving transducer array comprises a plurality of receiving transducers which are integrated to the multiplexer through the signal line, and the ultrasonic transmitting transducers and the receiving transducers are connected to the direct current power supply in parallel through the power line.
3. The online chromatography monitoring system for a tailings thickener of claim 2, wherein the ultrasonic receiving transducers are all broadband ultrasonic sensors, the ultrasonic transmitting transducers are controlled by a computer to excite pulses with different frequencies so as to realize signal marking and avoid mutual interference, the ultrasonic receiving transducers are all broadband ultrasonic sensors so as to realize response to ultrasonic pulses with different frequencies by changing excitation frequencies of the ultrasonic transducers and performing multiple scanning to realize multi-frequency ultrasonic chromatography.
4. The online chromatographic monitoring system for a tailings thickener of claim 1, wherein the data acquisition system comprises a signal filter, a multiplexer, a signal line, a computer and a memory, wherein the signal filter of the data acquisition system is connected with the multiplexer of the receiving transducer array through the signal line, and the multiplexer of the data acquisition system is connected with the signal filter of the transmitting transducer array through the signal line.
5. An online chromatographic monitoring system for a tailings thickener in accordance with claim 1 wherein said establishing a standard characteristic database in S1 is: S101, building a test device for measuring the mapping relation between ultrasonic wave speed and slurry concentration, wherein the test device comprises a slurry container, an ultrasonic controller, a timer, a transmitting probe and a receiving probe; s102, injecting slurry with known concentration into a slurry container, transmitting a signal with specific frequency generated by an ultrasonic controller to a transmitting probe to be converted into ultrasonic pulse, and starting a timer; S103, determining the acoustic characteristics of the slurry through a constant density acoustic wave equation, wherein the time domain and the frequency domain of the constant density acoustic wave equation are respectively: , , Wherein, the Is the speed of sound, In order to achieve a density of the particles, In order to be able to take time, In order to be of an angular frequency, For the value of the wave field pressure, Is a seismic source; s104, changing the frequency of a signal generated by the ultrasonic controller, and measuring the propagation speed of ultrasonic waves with different frequencies in the slurry with the current concentration; s105, changing slurries with different concentrations, and circulating the steps S102, S103 and S104 until a required test result is obtained, establishing a slurry acoustic characteristic standard database, and determining the correlation of sound velocity-density-time difference-frequency.
6. The online chromatographic monitoring system for a tailing thickener according to claim 1, wherein the collecting of the multi-frequency ultrasonic chromatographic data in S2 is: S201, a computer of a data acquisition system encodes a group of control signals, the control signals are sent to an ultrasonic emission array by a multiplexer, and corresponding excitation waveform, frequency, time and amplitude data are recorded; s202, a signal filter of an ultrasonic wave transmitting array receives control signals, filters the control signals into multipath control signals and transmits the multipath control signals to a corresponding ultrasonic wave transmitter; S203, the ultrasonic transmitter excites ultrasonic pulses with corresponding frequencies, the pulses penetrate through the slurry and are transmitted to the ultrasonic receiver; S204, the ultrasonic receiver converts the received pulse signals with different frequencies into multipath digital signals, wherein the multipath digital signals comprise waveform, frequency, arrival time and amplitude data, and the multipath digital signals are transmitted to the multiplexer; S205, the multiplexer gathers the multipath digital signals into a path of broadband digital signals, and transmits the path of broadband digital signals to a signal filter of the data acquisition system; S206, the signal filter of the data acquisition system filters the broadband digital signals into multipath digital signals and transmits the multipath digital signals to the computer for storing corresponding data; S207, changing the excitation frequency scheme of the ultrasonic emitter, and repeating the steps S201, S202, S203, S204, S205 and S206 for excitation, scanning and recording for a plurality of times to obtain multi-frequency source ultrasonic chromatographic data.
7. An online chromatographic monitoring system for a tailings thickener in accordance with claim 1 wherein the frequency source mixed domain full waveform inversion algorithm in S3 is: S301, ultrasonic time domain inversion, namely firstly carrying out time domain full waveform inversion on a sound velocity model of slurry by utilizing low-frequency ultrasonic chromatographic time difference and amplitude data; the objective function of the time domain full waveform inversion is: , Wherein, the In the case of a velocity model, As a function of the velocity model parameters, In order to be able to take time, For the total length of time, And (3) with Respectively calculating a wave field and an observed wave field; The model update gradient is: , , , , Wherein: In the case of a velocity model, As a function of the velocity model parameters, Is the speed of sound, In order to be able to take time, 、 And Respectively calculating a wave field, an observation wave field and an accompanying wave field; selecting proper iteration step length, repeatedly calculating gradient, and updating a speed model to minimize an objective function; S302, inverting an ultrasonic frequency domain, converting an ultrasonic time domain signal into a frequency domain signal through fast Fourier transform, and further inverting a full waveform of the frequency domain according to the frequency characteristic of high-frequency ultrasonic chromatography; The objective function of the frequency domain full waveform inversion is: , The model update gradient is: , , , , Wherein: In the case of a velocity model, As a function of the velocity model parameters, Is the speed of sound, In order to be of an angular frequency, In order to be able to take time, 、 And The calculated wavefield, the observed wavefield, and the satellite wavefield, respectively.
8. The online chromatographic monitoring system for a tailings thickener of claim 1 wherein the super resolution image depth learning in S4 is: S401, model training, namely firstly, taking part of low-frequency background sound velocity models as input and part of high-frequency disturbance sound velocity models as output through a convolutional neural network, training and establishing a sound velocity model resolution enhancement model, and obtaining a super-resolution reconstruction image; S402, evaluating and verifying the model, namely evaluating the quality of an output result of the model by calculating the peak signal-to-noise ratio and the structural similarity of the reconstructed image, wherein the higher the peak signal-to-noise ratio is, the higher the structural similarity is, the better the image quality is; the peak signal to noise ratio calculation formula is as follows: , , Wherein, the To reconstruct images And low resolution images Is used for the time-dependent error of the mean square, And The height and width of the image respectively, For the bit rate of the image it is, The unit is dB for peak signal-to-noise ratio; the structural similarity is calculated as follows: , Wherein, the In order for the structural similarity to be of a similar nature, , Respectively high resolution images And reconstructing an image Is used for the color filter, , Respectively the corresponding image variance is calculated from the image variance, Is the covariance of the two images, And (3) with Is a constant; S403, model testing, wherein the rest part of background models and disturbance models are used as test sets, so that the built models can reliably run and high-quality reconstructed images can be obtained; s404, finally, inputting the background model obtained by inversion and the disturbance model together, and establishing a super-resolution model of the slurry chromatography in the thickener.

Description

On-line chromatography monitoring system for tailing thickener Technical Field The invention relates to the technical field of measurement of mine tailing slurry thickening effect, in particular to an online chromatographic monitoring system for a tailing thickener. Background The tailing thickener is equipment for carrying out solid-liquid separation and improving the concentration of tailing slurry based on the gravity sedimentation effect, and is widely applied to the fields of surface stockpiling or underground filling at present. Slurry concentration and stratification height inside the thickener are key parameters affecting its operating state and related production. Although the sedimentation principle and efficiency of the thickener are greatly developed and improved from the early common thickener to the thickener with the paste deep cone added with the flocculant, the thickening state of the tailings slurry in the thickener is still invisible, the accurate on-line monitoring cannot be realized by the existing measuring means, so that the optimal control of the operation process of the thickener is difficult to be accurately realized, and the progress of the related production process is restricted. Therefore, a system capable of monitoring the internal operation state of the thickener on line in real time is needed. As a typical nondestructive monitoring technology, ultrasonic waves can realize chromatographic measurement on different media such as solid, liquid and gas, but the existing electronic area array sensor has higher cost and is difficult to be applied to engineering equipment such as a tailing thickener, while the electronic linear array sensor can only realize sequential excitation and cannot efficiently realize chromatographic scanning on large-scale equipment such as a thickener. Therefore, there is a need for an online chromatography monitoring system for a tailings thickener that addresses the above-described problems. Disclosure of Invention In order to solve the problems, the invention provides an online chromatographic monitoring system for a tailing thickener, which can accurately measure and analyze concentration distribution, layering condition and the like in the thickener in real time. The scheme of the invention is as follows: An on-line chromatography monitoring system for a tailing thickener comprises hardware and computer equipment for running software, wherein the hardware refers to an integrated ultrasonic sensor array and a data acquisition system, the software running on the computer equipment refers to a matched data processing and chromatography imaging algorithm, the hardware adopts a broadband ultrasonic transmitter, a broadband ultrasonic receiver and a multiplexing technology to form a sensor array so as to realize rapid chromatography of thickener slurry, and the software comprises the steps of measuring the acoustic characteristics of slurry, collecting multi-frequency source chromatography signals, carrying out full-wave inversion imaging on the multi-frequency source mixed domain, and carrying out deep learning-based chromatography image super-resolution reconstruction so as to realize real-time monitoring of the running state of the thickener. The integrated ultrasonic sensor array comprises a transmitting transducer array, a receiving transducer array, a signal filter, a multiplexer, a signal wire, a power wire and a direct current power supply, wherein the transmitting transducer array comprises a plurality of ultrasonic transmitting transducers which are integrated into the signal filter through the signal wire, the receiving transducer array comprises a plurality of receiving transducers which are integrated into the multiplexer through the signal wire, and the ultrasonic transmitting transducers and the receiving transducers are connected in parallel to the direct current power supply through the power wire. The method comprises the steps of selecting a plurality of ultrasonic receiving transducers, wherein the ultrasonic receiving transducers are all broadband ultrasonic sensors, exciting pulses with different frequencies by using a computer to control the ultrasonic transmitting transducers to realize signal marking and avoid mutual interference, performing multiple scanning by changing the excitation frequency of the ultrasonic transducers to realize multi-frequency ultrasonic chromatography, and the ultrasonic receiving transducers are all broadband ultrasonic sensors to realize response to the ultrasonic pulses with different frequencies. The data acquisition system comprises a signal filter, a multiplexer, a signal wire, a computer and a memory, wherein the signal filter of the data acquisition system is connected with the multiplexer of the receiving transducer array through the signal wire, and the multiplexer of the data acquisition system is connected with the signal filter of the transmitting transducer array through the signal wire. As a