CN-122016677-A - Online concentration detection system and method for quaternary ammonium salt bactericide based on circulating water system

CN122016677ACN 122016677 ACN122016677 ACN 122016677ACN-122016677-A

Abstract

The invention discloses a concentration online detection system and method of quaternary ammonium salt bactericides based on a circulating water system, belonging to the field of computer processing, wherein the method comprises the steps of obtaining a sample to be detected through a sampling pipeline connected with a circulating water pipeline, and obtaining a blank sample through a blank water sampling pipeline; the method comprises the steps of calculating an electric signal of a sample to be detected in a sample light pool under the maximum absorption peak wavelength to obtain a first absorbance, calculating an electric signal of a blank water light Chi Zhongkong white sample under the maximum absorption peak wavelength to obtain a second absorbance, obtaining a standard curve of absorbance and concentration calibrated in advance, and determining the concentration of the quaternary ammonium salt bactericide in the sample to be detected according to the first absorbance, the second absorbance and the standard curve, wherein the standard curve is used for calibrating and determining various quaternary ammonium salt standard solutions according to the maximum absorption peak wavelength.

Inventors

LIN LILIANG
LIU SHINIAN
ZHAO NING
LUO YAO
GAO QINGSHUI

Assignees

南方电网电力科技股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260119

Claims (10)

1. The online concentration detection system for the quaternary ammonium salt bactericide based on the circulating water system is characterized by comprising a sample acquisition module, a light absorption detection module and a concentration calculation module; The sample acquisition module is used for acquiring a sample to be detected through a sampling pipeline connected with a circulating water pipeline and acquiring a blank sample through a blank water sampling pipeline, wherein the sample to be detected and the blank sample are solutions obtained by sequentially mixing a buffer solution and a target solution, and the target solution comprises any one of a color reagent for performing color development reaction with a quaternary ammonium salt or a coloring reagent for performing color fading reaction with the quaternary ammonium salt; the light absorption detection module is used for calculating an electric signal of the sample to be detected in the sample optical pool under the maximum absorption peak wavelength to obtain first absorbance, and calculating an electric signal of the blank sample in the blank water optical pool under the maximum absorption peak wavelength to obtain second absorbance; the concentration calculation module is used for obtaining a standard curve of absorbance and concentration calibrated in advance, determining the concentration of the quaternary ammonium salt bactericide in the sample to be detected according to the first absorbance, the second absorbance and the standard curve so as to realize the online detection of the concentration of the quaternary ammonium salt bactericide, wherein the standard curve is used for calibrating and determining various quaternary ammonium salt standard solutions according to the maximum absorption peak wavelength.
2. The online concentration detection system of quaternary ammonium salt bactericides based on a circulating water system according to claim 1, wherein the sample acquisition module comprises a sampling unit and a reagent unit, the light absorption detection module comprises a water sample detection unit and a blank water detection unit, the sampling unit is connected with the water sample detection unit, the reagent unit is respectively connected with the water sample detection unit and the blank water detection unit, and the water sample detection unit and the blank water detection unit are respectively connected with the concentration calculation module; The sampling unit comprises a sample water inlet pipe, a sample water sampling pump, a sampling electric valve, a buffer filter, a sample water discharge electric valve and a sample water discharge pipe which are sequentially connected, and the buffer filter is sequentially connected with a backwash wastewater discharge pipeline and a backwash wastewater discharge electric valve; The reagent unit comprises a sample water buffer solution electric valve, a buffer solution sample injection pump and a blank water buffer solution electric valve which are sequentially connected, wherein the buffer solution sample injection pump is connected with a buffer solution storage tank, and a sample water developer electric valve, a developer sample injection pump and a blank water developer sample injection electric valve which are sequentially connected are connected, and the developer sample injection pump is connected with a developer storage tank; the water sample detection unit comprises a sample water sampling electric valve, a sample water sampling pump, a sample water-buffer solution mixer, a sample water-color reagent mixer, a sample water analysis sampling pump and a sample water detection chamber which are sequentially connected, wherein the sample water detection chamber comprises a sample water ultraviolet-infrared variable light source, a sample water light pool and a sample water light intensity detector, and the sample water light pool is connected with a sample water analysis liquid delivery pipe; The blank water detection unit comprises a blank water sampling tube, a blank water sampling electric valve, a blank water sampling pump, a blank water-buffer solution mixer, a blank water-color-developing agent mixer, a blank water analysis sampling pump and a blank water detection chamber which are sequentially connected, wherein the blank water detection chamber comprises a blank water ultraviolet-infrared variable light source, a blank water light pool and a blank water light intensity detector, and the blank water light pool is connected with a blank water analysis liquid delivery tube; The concentration calculation module comprises a data processing and transmitting unit, a quaternary ammonium salt dosing pump and a quaternary ammonium salt dosing pipeline which are sequentially connected, and the quaternary ammonium salt dosing pump is connected with a quaternary ammonium salt storage tank.
3. The online detection system for the concentration of the quaternary ammonium salt bactericide based on the circulating water system according to claim 1, wherein the method is characterized by obtaining a pre-calibrated absorbance and concentration standard curve, specifically comprising the following steps: Respectively performing blank detection on the sample light pool and the blank water light pool to obtain a first absorbance difference value corresponding to the absorption wavelength under each detection light, and respectively performing maximum absorption peak wavelength detection on the sample light pool and the blank water light pool to obtain a second absorbance difference value corresponding to the absorption wavelength under each detection light; Determining the maximum absorption peak wavelength according to the maximum difference between each first absorbance difference and each second absorbance difference; Aiming at each quaternary ammonium salt standard solution, detecting attenuation detection light rays of the quaternary ammonium salt standard solution in the sample light pool and the blank sample in the blank water light pool under the maximum absorption peak wavelength to obtain electric signals of the maximum absorption peak wavelength under the sample light pool and the blank water light pool, and converting and calculating the electric signals under the sample light pool and the blank water light pool to obtain a third absorbance difference value of each quaternary ammonium salt standard solution corresponding to the maximum absorption peak wavelength; Determining the absorbance difference value corresponding to each quaternary ammonium salt standard solution according to the third absorbance difference value corresponding to each quaternary ammonium salt standard solution; and linearly regressing the absorbance difference value and the concentration of each quaternary ammonium salt standard solution according to the lambert-beer law to obtain the standard curve.
4. The online detection method for concentration of quaternary ammonium salt bactericide based on circulating water system according to claim 3, wherein the method is characterized in that the first absorbance difference value corresponding to the absorption wavelength under each detection light is obtained by performing blank detection on the sample light pool and the blank water light pool respectively, and the second absorbance difference value corresponding to the absorption wavelength under each detection light is obtained by performing maximum absorption peak wavelength detection on the sample light pool and the blank water light pool respectively, and specifically comprises the following steps: detecting the attenuation detection light rays of the blank calibration samples in the sample light pool and the blank water light pool respectively to obtain electric signals of the detection light rays under the sample light pool and the blank water light pool respectively; For each detection light ray, respectively converting and calculating the electric signals under the sample light pool and the blank water light pool to obtain a first absorbance difference value corresponding to the absorption wavelength under each detection light ray; sequentially mixing the buffer solution, the target solution and the target quaternary ammonium salt standard solution according to a preset proportion to obtain a mixed quaternary ammonium salt solution, and sequentially mixing the buffer solution, the target solution and the blank calibration sample according to a preset proportion to obtain a mixed calibration sample; And detecting the attenuation detection light rays of the mixed quaternary ammonium salt solution in the sample light pool and the mixed calibration sample in the blank water light pool under the detection light rays respectively to obtain a second absorbance difference value corresponding to the absorption wavelength under the detection light rays.
5. The online detection system for the concentration of the quaternary ammonium salt bactericide based on the circulating water system according to claim 1, wherein the linear regression is performed on the absorbance difference value and the concentration of each quaternary ammonium salt standard solution to obtain the standard curve, specifically: performing linear regression on the absorbance difference value and the concentration of each quaternary ammonium salt standard solution to obtain a linear regression equation; Calculating the ratio of the intercept to the slope in the linear regression equation and the correlation coefficient of the linear regression equation; If the ratio is smaller than or equal to a first preset threshold value and the correlation coefficient is larger than a second preset threshold value, judging that the linear regression equation is effective, and obtaining the standard curve; And if the ratio is greater than the first preset threshold or the correlation coefficient is smaller than or equal to the second preset threshold, judging that the linear regression equation is invalid, and carrying out linear regression again.
6. The online detection system for the concentration of the quaternary ammonium salt bactericide based on the circulating water system according to claim 1, further comprising: determining a control instruction according to the concentration of the quaternary ammonium salt bactericide; Inputting actual operation data to a time prediction model to output start time and stop time corresponding to the control instruction; and responding to the control instruction based on the starting time and the stopping time so as to add the quaternary ammonium salt bactericide to the circulating water in the circulating water pipeline.
7. The online detection system for the concentration of the quaternary ammonium salt bactericide based on the circulating water system according to claim 6, wherein the time prediction model comprises a first time prediction model and a second time prediction model, and is specifically: establishing a first deep learning model according to a circulating water quaternary ammonium salt concentration decay function in a preset time period, training the first deep learning model according to first historical operation data to obtain a first time prediction model, wherein the first time prediction model is used for predicting starting time corresponding to the control instruction, the first historical operation data comprises any multiple of circulating water quaternary ammonium salt concentration, unit load, circulating water temperature, circulating water conductivity, circulating water pH value, circulating water supplementing flow or circulating water blowdown flow in the preset time period, and the preset time period refers to a time period from the last stopping of dosing to the current starting of dosing or a time period from the last starting of reducing dosing to the current starting of increasing dosing; establishing a second deep learning model according to a circulating water quaternary ammonium salt concentration increment function in a preset time period, training the second deep learning model according to second historical operation data to obtain a second time prediction model, wherein the second time prediction model is used for predicting stop time corresponding to the control instruction, and the second historical operation data comprises any multiple of circulating water quaternary ammonium salt concentration, a dosing pump stroke, a dosing pump frequency, unit load, circulating water temperature, circulating water conductivity, circulating water pH value, circulating water supplementing flow or circulating water blowdown flow in the preset time period.
8. The online concentration detection system of quaternary ammonium salt bactericides based on a circulating water system according to claim 1, wherein the sample to be detected is obtained through a sampling pipeline connected with a circulating water pipeline, specifically: obtaining an initial sample through a sampling pipeline connected with a circulating water pipeline; and filtering the initial sample through a buffer filter to obtain the sample to be detected.
9. The online concentration detection method of the quaternary ammonium salt bactericide based on the circulating water system is characterized by comprising the following steps of: Obtaining a sample to be detected through a sampling pipeline connected with a circulating water pipeline, and obtaining a blank sample through a blank water sampling pipeline, wherein the sample to be detected and the blank sample are solutions obtained by sequentially mixing a buffer solution and a target solution, and the target solution comprises any one of a color reagent for performing a color reaction with a quaternary ammonium salt or a coloring reagent for performing a color fading reaction with the quaternary ammonium salt; calculating an electric signal of the sample to be detected in the sample optical pool under the maximum absorption peak wavelength to obtain a first absorbance, and calculating an electric signal of the blank sample in the blank water optical pool under the maximum absorption peak wavelength to obtain a second absorbance; And obtaining a standard curve of absorbance and concentration calibrated in advance, determining the concentration of the quaternary ammonium salt bactericide in the sample to be detected according to the first absorbance, the second absorbance and the standard curve, and calibrating and determining various quaternary ammonium salt standard solutions according to the maximum absorption peak wavelength by using the standard curve based on a circulating water system quaternary ammonium salt bactericide concentration online detection system.
10. The online detection method for the concentration of the quaternary ammonium salt bactericide based on the circulating water system according to claim 1, wherein the method is characterized by obtaining a pre-calibrated absorbance and concentration standard curve, and specifically comprises the following steps: Respectively performing blank detection on the sample light pool and the blank water light pool to obtain a first absorbance difference value corresponding to the absorption wavelength under each detection light, and respectively performing maximum absorption peak wavelength detection on the sample light pool and the blank water light pool to obtain a second absorbance difference value corresponding to the absorption wavelength under each detection light; Determining the maximum absorption peak wavelength according to the maximum difference between each first absorbance difference and each second absorbance difference; Aiming at each quaternary ammonium salt standard solution, detecting attenuation detection light rays of the quaternary ammonium salt standard solution in the sample light pool and the blank sample in the blank water light pool under the maximum absorption peak wavelength to obtain electric signals of the maximum absorption peak wavelength under the sample light pool and the blank water light pool, and converting and calculating the electric signals under the sample light pool and the blank water light pool to obtain a third absorbance difference value of each quaternary ammonium salt standard solution corresponding to the maximum absorption peak wavelength; Determining the absorbance difference value corresponding to each quaternary ammonium salt standard solution according to the third absorbance difference value corresponding to each quaternary ammonium salt standard solution; and linearly regressing the absorbance difference value and the concentration of each quaternary ammonium salt standard solution according to the lambert-beer law to obtain the standard curve.

Description

Online concentration detection system and method for quaternary ammonium salt bactericide based on circulating water system Technical Field The invention relates to the technical field of computer processing, in particular to a system and a method for detecting the concentration of quaternary ammonium salt bactericides on line based on a circulating water system. Background The quaternary ammonium salt bactericide is a non-oxidizing bactericide and has broad-spectrum bactericidal capacity, and comprises benzalkonium chloride, didecyl dimethyl ammonium chloride, ‌ laurylamine dipropylene diamine and the like. Besides the capability of killing fungi, the quaternary ammonium salt bactericide has particularly outstanding algae killing effect, and can keep the circulating water system clean because the quaternary ammonium salt bactericide is used as a surfactant and has the microbial slime stripping effect. However, the dosage of the agent needs to be controlled in the use process, if the dosing concentration is too low, the killing effect is insufficient, the microorganism is still bred after a period of operation of the circulating water system, and if the dosing concentration of the system is too high, the dosing cost of the agent is increased, and a large amount of foam is easily generated in the circulating water, so that the operation of the system is influenced. In addition, the quaternary ammonium salt has toxicity to shellfish organisms, and if the dosage is too large, ecological hazard can be generated to surrounding water areas. At present, a spectrophotometry is generally used for carrying out manual detection on quaternary ammonium salt, but a manual detection system cannot meet the requirement of continuous detection on the dosing concentration of circulating water, and difficulty is caused in dosing and pollution discharge control, or a fluorescence spectrophotometer is adopted for respectively measuring the fluorescence intensity of a fluorescent tracer in a compound water treatment agent under different concentrations in the circulating water, a standard curve graph of the fluorescence intensity and the concentration is drawn, and the content of the water treatment agent in the circulating water system is monitored according to the standard curve corresponding to the fluorescence intensity, but the cost of the fluorescent tracer is high, and the system does not consider the influence of factors such as a detection instrument, a reaction solution and the like on a measurement result, so that the detection error is large and the accuracy is low. Disclosure of Invention The invention provides a system and a method for online detection of the concentration of quaternary ammonium salt bactericides based on a circulating water system, which can solve the problems of larger detection error and low precision and realize the accurate and continuous detection of the concentration of quaternary ammonium salt bactericides. The embodiment of the invention provides a concentration online detection system of quaternary ammonium salt bactericides based on a circulating water system, which comprises a sample acquisition module, a light absorption detection module and a concentration calculation module; The sample acquisition module is used for acquiring a sample to be detected through a sampling pipeline connected with a circulating water pipeline and acquiring a blank sample through a blank water sampling pipeline, wherein the sample to be detected and the blank sample are solutions obtained by sequentially mixing a buffer solution and a target solution, and the target solution comprises any one of a color reagent for performing color development reaction with a quaternary ammonium salt or a coloring reagent for performing color fading reaction with the quaternary ammonium salt; the light absorption detection module is used for calculating an electric signal of the sample to be detected in the sample optical pool under the maximum absorption peak wavelength to obtain first absorbance, and calculating an electric signal of the blank sample in the blank water optical pool under the maximum absorption peak wavelength to obtain second absorbance; the concentration calculation module is used for obtaining a standard curve of absorbance and concentration calibrated in advance, determining the concentration of the quaternary ammonium salt bactericide in the sample to be detected according to the first absorbance, the second absorbance and the standard curve so as to realize the online detection of the concentration of the quaternary ammonium salt bactericide, wherein the standard curve is used for calibrating and determining various quaternary ammonium salt standard solutions according to the maximum absorption peak wavelength. According to the embodiment of the invention, the sample to be detected and the blank sample which are mixed with the buffer solution and the color reagent (or the coloring agent) are obtained,