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CN-121978080-A - Water quality on-line analysis method and system in radioactive waste liquid treatment process

CN121978080ACN 121978080 ACN121978080 ACN 121978080ACN-121978080-A

Abstract

The invention provides a method and a system for on-line analysis of water quality in the radioactive waste liquid treatment process, and relates to the technical field of on-line monitoring of water quality, wherein the method comprises the following steps that step 1, a clarified sample is introduced into an analysis tank, and Raman spectrum characteristic peak data are collected in real time through a plurality of groups of optical fiber Raman probe arrays distributed in the analysis tank along the flowing direction of the waste liquid; and 2, extracting an equal-concentration line for a specific interference object component in the two-dimensional concentration distribution field, performing discrete sampling, calculating the minimum circumcircle of all sampling points, and obtaining the center coordinates and the radius of the equal-concentration line. The invention realizes the intelligent regulation and control of the treatment process parameters and ensures the stable and standard discharge water quality.

Inventors

  • GU LONG
  • Su Xingkang
  • WANG GUAN
  • HUANG HUA

Assignees

  • 福建睿斯科医疗技术有限公司

Dates

Publication Date
20260505
Application Date
20260402

Claims (10)

  1. 1. The method for on-line analysis of water quality in the radioactive waste liquid treatment process is characterized by comprising the following steps: Step 1, introducing a clarified sample into an analysis tank, and collecting Raman spectrum characteristic peak data in real time through a plurality of groups of optical fiber Raman probe arrays distributed in the analysis tank along the flowing direction of the waste liquid; step 2, extracting an equal-concentration line for a specific interferent component in the two-dimensional concentration distribution field, performing discrete sampling, and calculating the minimum circumcircle of all sampling points to obtain the center coordinates and the radius of the equal-concentration line; Step 3, according to the position deviation of the center coordinates relative to the center of the preset detection window and the proportional relation between the radius and the size of the detection window, combining a pre-stored interference coefficient database, and respectively calculating a radiation attenuation compensation coefficient, a polarization correction factor, a response delay compensation value and a light scattering interference suppression coefficient; step 4, detecting and correcting the initial water quality parameters of the total alpha radioactivity, the total beta radioactivity, the conductivity, the pH value and the turbidity obtained by the radiation detector, the conductivity electrode, the pH electrode and the turbidity meter in real time respectively through a radiation attenuation compensation coefficient, a polarization correction factor, a response delay compensation value and a light scattering interference suppression coefficient to obtain corrected real-time water quality parameters; And step 5, uploading the corrected real-time water quality parameters to a distributed control unit, automatically regulating and controlling the evaporation concentration ratio and the reverse osmosis membrane flushing period by the distributed control unit, and judging whether the discharged water quality meets the discharge standard.
  2. 2. The method for on-line analysis of water quality in the radioactive waste liquid treatment process according to claim 1, wherein the step 1 is preceded by respectively leading out a closed bypass on-line analysis flow path from an outlet of an evaporation concentration unit and a standard discharge outlet, continuously introducing a waste liquid sample, and performing on-line ultrafiltration and ultrasonic crushing pretreatment on the introduced waste liquid sample to remove suspended matters and colloid interferents in the waste liquid sample, thereby obtaining a clarified sample.
  3. 3. The method for on-line analysis of water quality in radioactive waste liquid treatment process according to claim 2, wherein step 1, the clarified sample is introduced into an analysis tank, raman spectrum characteristic peak data is collected in real time through a plurality of groups of optical fiber raman probe arrays distributed in the analysis tank along the flow direction of the waste liquid, the raman spectrum characteristic peak data is subjected to principal component analysis, characteristic spectrum vectors corresponding to main radionuclides and interferents are extracted, and a two-dimensional concentration distribution field is constructed according to continuous changes of the characteristic spectrum vectors in space positions, and the method comprises the following steps: Respectively carrying out principal component decomposition on the Raman spectrum characteristic peak data acquired by each optical fiber Raman probe array, extracting a plurality of principal components with accumulated contribution rate exceeding a preset threshold value in each optical fiber Raman probe array as characteristic spectrum vectors of the position, and arranging the characteristic spectrum vectors extracted by each optical fiber Raman probe array according to the sequence of the flowing direction of the waste liquid to form a characteristic spectrum vector sequence; Spline interpolation is carried out on the characteristic spectrum vector sequence along the flowing direction to obtain axial continuous spectrum characteristic distribution, the space weight distribution is carried out on the spectrum characteristic value at each axial position on the cross section based on the space influence range of each radial detection point by combining the radial detection point position coordinates of each fiber Raman probe array to obtain the spectrum characteristic value at each grid point on the cross section of the analysis pool, the similarity of the spectrum characteristic value of each grid point and the standard spectrum of the interfering object is calculated, and the concentration of the interfering object at the grid point is determined according to the similarity value, so that a two-dimensional concentration distribution field of the pollutant on the cross section of the analysis pool is formed.
  4. 4. The method for on-line analysis of water quality in a radioactive waste liquid treatment process according to claim 3, wherein step 2, for specific interferent components in a two-dimensional concentration distribution field, extracts an equal concentration line and performs discrete sampling, calculates a minimum circumcircle of all sampling points, and obtains a center coordinate and a radius of the equal concentration line, comprising: Setting a plurality of concentration gradient values for target interference object components in a two-dimensional concentration distribution field, respectively extracting equal concentration lines corresponding to each concentration gradient value, wherein each equal concentration line is composed of continuous space points with the same concentration value; Performing equal arc length discrete sampling on each equal-concentration line to obtain a boundary characteristic point sequence uniformly distributed on the equal-concentration lines, wherein the boundary characteristic point sequence comprises coordinate information of each characteristic point on the cross section of an analysis pool; And for the boundary characteristic point sequence corresponding to each equal-concentration line, determining the minimum circumcircle covering all the characteristic points in the sequence by gradually adjusting the circle center position and expanding the radius range, and recording the circle center coordinate and the radius of the minimum circumcircle as the circle center coordinate and the radius of the equal-concentration line.
  5. 5. The method for on-line analysis of water quality in a radioactive waste liquid treatment process according to claim 4, wherein step 3, according to the positional deviation of the center coordinates with respect to the center of a preset detection window and the proportional relation between the radius and the size of the detection window, respectively calculating the radiation attenuation compensation coefficient, the polarization correction factor, the response delay compensation value and the light scattering interference suppression coefficient by combining a pre-stored interference coefficient database, comprises: Calculating the Euclidean distance between the center coordinates of each equal-concentration line and the center of a preset detection window, dividing the Euclidean distance by the length of the diagonal line of the detection window, and carrying out normalization processing to obtain normalized position deviation; For each isoconcentration line, taking the normalized position deviation and the radial dimension proportion as input parameters, and inquiring a basic compensation coefficient set under a corresponding working condition in a pre-stored interference coefficient database, wherein the basic compensation coefficient set comprises a basic radiation attenuation compensation coefficient of a radiation detector window, a basic polarization correction factor of a conductivity electrode, a basic response delay compensation value of a pH electrode and a basic light scattering interference suppression coefficient of a turbidimeter; And carrying out weighted fusion on the basic compensation coefficient groups obtained by inquiring a plurality of equal concentration lines corresponding to different concentration gradient values, carrying out weighted average calculation on the weight coefficient corresponding to the equal concentration line with higher concentration gradient value according to the concentration gradient value represented by each equal concentration line to obtain a comprehensive radiation attenuation compensation coefficient, a comprehensive polarization correction factor, a comprehensive response delay compensation value and a comprehensive light scattering interference suppression coefficient which are finally used for correction, wherein the weight coefficient corresponding to the equal concentration line with higher concentration gradient value is larger.
  6. 6. The method for on-line analysis of water quality in a radioactive waste liquid treatment process according to claim 5, wherein said step 4 comprises: Combining the total alpha radioactivity initial data obtained by real-time detection of the radiation detector with the comprehensive radiation attenuation compensation coefficient, and correcting the total alpha radioactivity initial data to obtain corrected total alpha radioactivity; Combining the total beta-radioactivity initial data obtained by real-time detection of the radiation detector with the comprehensive radiation attenuation compensation coefficient, correcting the total beta-radioactivity initial data, eliminating measurement negative drift caused by detector window pollution, and obtaining corrected total beta-radioactivity; Combining the conductivity initial data obtained by detecting the conductivity electrode in real time with the comprehensive polarization correction factor, correcting the conductivity initial data, compensating response lag and measurement deviation caused by electrode surface pollution, and obtaining corrected conductivity; combining the pH value initial data obtained by the real-time detection of the pH electrode with the comprehensive response delay compensation value, correcting the pH value initial data, and compensating response delay and measurement drift caused by electrode surface pollution to obtain a corrected pH value; Combining turbidity initial data obtained by real-time detection of a turbidity meter with the comprehensive light scattering interference suppression coefficient, and correcting the turbidity initial data to obtain corrected turbidity; and forming the corrected real-time water quality parameter by the corrected total alpha radioactivity, the corrected total beta radioactivity, the corrected conductivity, the corrected pH value and the corrected turbidity together.
  7. 7. The method for on-line analysis of water quality in a radioactive waste liquid treatment process according to claim 6, wherein said step 5 comprises: The distributed control unit receives the corrected real-time water quality parameters and constructs a double-objective optimization function by taking the emission water quality reaching the standard and the lowest operation energy consumption as optimization targets, wherein the emission water quality reaching the standard is judged by comparing the corrected real-time water quality parameters with a preset emission standard threshold value, and the operation energy consumption is calculated and obtained according to the real-time operation parameters of the evaporation concentration unit and the reverse osmosis membrane unit; Adopting an iterative optimization method for simulating a biological population cooperation and competition mechanism, taking the constructed dual-objective optimization function as an adaptability evaluation basis, calculating an adaptability value of each candidate solution, simulating an information sharing and superior and inferior elimination process between individuals, and continuously updating the candidate solutions in the population until the preset iteration times are reached to obtain a final evaporation concentration ratio and reverse osmosis membrane flushing period combination of the dual-objective optimization function, wherein the evaporation concentration ratio and reverse osmosis membrane flushing period combination is used as a final regulation parameter combination; and meanwhile, comparing the corrected real-time water quality parameters with a preset discharge standard threshold, judging that the discharge water quality meets the discharge standard if all the water quality parameters are smaller than or equal to the corresponding discharge standard threshold, and otherwise, sending an alarm signal and triggering an emergency treatment process.
  8. 8. An on-line analysis system for water quality in a radioactive waste liquid treatment process, which implements the method according to any one of claims 1 to 7, characterized by comprising: The acquisition module is used for introducing the clarified sample into the analysis tank, and acquiring Raman spectrum characteristic peak data in real time through a plurality of groups of optical fiber Raman probe arrays distributed in the analysis tank along the flowing direction of the waste liquid; The extraction module is used for extracting the specific interference object component in the two-dimensional concentration distribution field, performing discrete sampling on the equal concentration line, and calculating the minimum circumcircle of all sampling points to obtain the circle center coordinates and the radius of the equal concentration line; the calculating module is used for respectively calculating a radiation attenuation compensation coefficient, a polarization correction factor, a response delay compensation value and a light scattering interference suppression coefficient according to the position deviation of the center coordinates relative to the center of the preset detection window and the proportional relation between the radius and the size of the detection window by combining a pre-stored interference coefficient database; The correction module is used for respectively detecting and correcting the initial water quality parameters of the total alpha radioactivity, the total beta radioactivity, the conductivity, the pH value and the turbidity obtained by the radiation detector, the conductivity electrode, the pH electrode and the turbidity meter in real time through the radiation attenuation compensation coefficient, the polarization correction factor, the response delay compensation value and the light scattering interference suppression coefficient to obtain corrected real-time water quality parameters; And the processing module is used for uploading the corrected real-time water quality parameters to the distributed control unit, automatically regulating and controlling the evaporation concentration ratio and the reverse osmosis membrane flushing period by the distributed control unit, and judging whether the discharged water quality meets the discharge standard.
  9. 9. A computing device, comprising: One or more processors; Storage means for storing one or more programs which when executed by the one or more processors cause the one or more processors to implement the method of any of claims 1to 7.
  10. 10. A computer readable storage medium, characterized in that the computer readable storage medium has stored therein a program which, when executed by a processor, implements the method according to any of claims 1 to 7.

Description

Water quality on-line analysis method and system in radioactive waste liquid treatment process Technical Field The invention relates to the technical field of water quality on-line monitoring, in particular to a water quality on-line analysis method and system in the radioactive waste liquid treatment process. Background In the nuclear industry radioactive waste liquid treatment scene, the evaporation concentration and reverse osmosis combined treatment process becomes a conventional technical means of waste liquid reduction and standard discharge, the water quality online analysis system of the existing radioactive waste liquid treatment process generally adopts bypass sampling from an evaporation concentration unit and a reverse osmosis unit, single-point in-situ detection is directly carried out through a total alpha and beta radiation detector, a conductivity electrode, a pH electrode and a turbidity meter after simple filtration, then the evaporation concentration ratio and the reverse osmosis membrane flushing period are manually or semi-automatically regulated according to detection values, the conventional single-point detection mode does not consider the actual working condition that suspended matters, colloids and interference components in the waste liquid are in non-uniform spatial distribution in fluid, the influence of the spatial distribution difference of the interference objects on radiation attenuation of a detector window, electrode polarization, response delay and light scattering interference cannot be quantified, so that measurement drift and insufficient detection precision of water quality key parameters are easy to occur, the stable discharge quality is difficult to reach standard, and intelligent regulation and control of treatment process parameters cannot be realized. Disclosure of Invention The invention provides a method and a system for on-line analysis of water quality in the radioactive waste liquid treatment process, which realize intelligent regulation and control of treatment process parameters and ensure that the discharged water quality is stable and reaches the standard. In order to solve the technical problems, the technical scheme of the invention is as follows: In a first aspect, a method for on-line analysis of water quality in a radioactive waste liquid treatment process, the method comprising: Step 1, introducing a clarified sample into an analysis tank, and collecting Raman spectrum characteristic peak data in real time through a plurality of groups of optical fiber Raman probe arrays distributed in the analysis tank along the flowing direction of the waste liquid; step 2, extracting an equal-concentration line for a specific interferent component in the two-dimensional concentration distribution field, performing discrete sampling, and calculating the minimum circumcircle of all sampling points to obtain the center coordinates and the radius of the equal-concentration line; Step 3, according to the position deviation of the center coordinates relative to the center of the preset detection window and the proportional relation between the radius and the size of the detection window, combining a pre-stored interference coefficient database, and respectively calculating a radiation attenuation compensation coefficient, a polarization correction factor, a response delay compensation value and a light scattering interference suppression coefficient; step 4, detecting and correcting the initial water quality parameters of the total alpha radioactivity, the total beta radioactivity, the conductivity, the pH value and the turbidity obtained by the radiation detector, the conductivity electrode, the pH electrode and the turbidity meter in real time respectively through a radiation attenuation compensation coefficient, a polarization correction factor, a response delay compensation value and a light scattering interference suppression coefficient to obtain corrected real-time water quality parameters; And step 5, uploading the corrected real-time water quality parameters to a distributed control unit, automatically regulating and controlling the evaporation concentration ratio and the reverse osmosis membrane flushing period by the distributed control unit, and judging whether the discharged water quality meets the discharge standard. Furthermore, the step 1 is preceded by respectively leading out a closed bypass on-line analysis flow path from an outlet of the evaporation concentration unit and a standard discharge outlet, continuously introducing a waste liquid sample, and carrying out on-line ultrafiltration and ultrasonic crushing pretreatment on the introduced waste liquid sample to remove suspended matters and colloid interferents in the waste liquid sample so as to obtain a clarified sample. Further, the clarified sample is introduced into an analysis tank, and Raman spectrum characteristic peak data is collected in real time through a plurality of groups of optica