CN102156100A - Multispectral-based multipoint sampling multiparameter water quality on-line analytical system - Google Patents

Abstract

The invention discloses a multi-point sampling multi-parameter water quality online analysis system based on multi-spectrum, which includes an optical system, a waterway system and a detection control system; Measure the ultraviolet-visible transmission spectrum and fluorescence, Raman and other emission spectra of water samples, and convert them into digital signals. The waterway system adopts a multi-point sampling design. Through the switch control of the water pump and solenoid valve, quantitative sewage and quantitative clean water enter the sampling device for spectral data collection, and it also has the automatic cleaning function of the sewage pipeline system. The detection and control system uses industrial computer as the core processing unit; the whole system can run automatically and continuously, which is suitable for online analysis.

Description

Multi-spectrum-based multi-point sampling and multi-parameter water quality online analysis system

technical field

The invention belongs to the technical field of resources and environment, and is used for online rapid detection of water quality parameters, in particular to a multi-spectrum-based multi-point sampling and multi-parameter water quality online analysis system.

Background technique

Comprehensive indicators of organic pollutants (such as TOC, COD, BOD, DOC, and permanganate index, etc.) reflect the overall level of water body pollution by organic matter from different aspects, and are important indicators for measuring the degree of water pollution. Quantitative assessment basis for "discharge" and "total control". In recent years, the research and development of online analyzers for water quality parameters (mainly detecting COD, TOC, etc.) have received extensive attention, and there are many types and models of their products. Based on different measurement principles, these online analyzers can basically be divided into two categories: online water quality analyzers based on chemical methods, and online water quality analyzers based on optical methods. Compared with the chemical analysis method, the optical analysis method performs qualitative and quantitative analysis on the categories and comprehensive indicators of organic pollutants based on spectral data. It has significant advantages such as no chemical reagent pollution, fast analysis speed, low system operation cost, and easy online analysis. .

The online water quality analyzers based on the principle of optical measurement currently entering the market are mainly based on ultraviolet/visible (UV/Vis) absorbance or ultraviolet/visible absorption spectroscopy analysis methods. However, the existing UV/visible absorption spectrum online analyzer is difficult to adapt to different types of sewage with different pollution levels, and the detection unit of the online analysis device is easily polluted by sewage, resulting in poor accuracy of the analyzer and heavy maintenance workload. Meet the needs of large-scale real-time monitoring of water quality. In view of the insufficient analysis and measurement accuracy of the online water quality analyzer by the ultraviolet absorption method, researchers have begun to turn to the fluorescence method with higher sensitivity in recent years. However, the shortcomings of fluorescence spectroscopy are that there are unstable factors such as quenching, self-absorption, and internal filtering, and there are also interferences such as Raman scattering and Rayleigh scattering of water.

The existing single ultraviolet absorption spectrometry or fluorescence spectrometry have some deficiencies in the analysis of comprehensive indicators of water quality organic pollution. On the other hand, there is a certain correlation and complementarity between the two spectra. The prerequisite for organic matter in water to produce fluorescence is to be able to absorb excitation light, so organic matter that can produce fluorescence has absorption peaks in the ultraviolet spectrum. Since suspended matter or certain types of organic matter will produce very similar absorption peaks on the ultraviolet spectrum of the same wavelength, the types of these substances cannot be distinguished only by the ultraviolet spectrum; but they will produce different fluorescence spectra when excited by UV light. Thereby improving the resolution of water quality analysis. In addition, an important defect of fluorescence spectroscopy is instability, which can be compensated by ultraviolet spectroscopy.

The invention patent with the application number of 200810060383.6 "a multi-source spectrum fusion portable water quality analyzer" discloses a multi-source spectrum fusion portable water quality analyzer, which includes an optical system and a detection and control system, and uses an integrated laser, a deuterium-halogen light source and The dual-spectrum detector scans the ultraviolet-visible transmission spectrum and fluorescence, Raman and other emission spectra of the water sample to be tested. The embedded data processing unit calculates the water quality analysis index value based on the collected water sample spectral data, and controls the entire instrument. Work, realize user interaction through the display screen and keyboard. Due to the special design of using lithium battery for power supply and 360° receiving of emitted light, it has a compact structure and is easy to carry and use. Since the only part in contact with the sample to be tested in this invention patent is the sample pool, there is no water system for automatic water intake, drainage, dilution ratio, and cleaning, so it can only be used for offline detection. For occasions that require long-term continuous monitoring, such as sewage treatment The on-line monitoring of the factory, etc. is powerless; and because the emitted light of the sample in the patented optical system of the invention adopts a 360° angle receiving method with the incident light, it is necessary to use two spectral detection systems of linear array CCD and area array CCD at the same time , the optical path system is relatively complex and the cost is high; in addition, the invention patent uses eight wavelengths of 405nm, 532nm, 635nm, 650nm, 660nm, 690nm, 785nm, 808nm, 830nm for the excitation light of the emission spectrum such as excitation fluorescence and Raman The wavelength range of the laser is in the visible light or near-infrared range. Since the excitation wavelength range required by most substances that generate fluorescence is in the ultraviolet-visible band, the laser of the invention is not conducive to the detection of fluorescence emission spectrum.

Contents of the invention

The purpose of the present invention is to provide a multi-spectrum-based multi-point sampling and multi-parameter water quality online analysis system for the deficiencies of the prior art.

The purpose of the present invention is achieved through the following technical solutions: a multi-spectral multi-point sampling multi-parameter water quality online analysis system, which includes an optical system, a waterway system and a detection control system.

Wherein, the optical system includes: a pulsed xenon lamp, a first concave mirror, a first filter, a first convex lens, a first optical fiber, a second convex lens, a sample cell, a third convex lens, a second optical fiber, a slit, and a second filter sheet, second concave mirror, grating, charge-coupled element, multi-wavelength laser, third optical fiber and fourth convex lens, etc.; the pulse xenon lamp is located at the concave focus of the first concave mirror, the first concave mirror and the first filter, the second A convex lens is arranged coaxially and horizontally in sequence, the two ends of the first optical fiber are respectively connected with the first convex lens and the second convex lens, the second convex lens is arranged coaxially with the sample cell and the third convex lens is horizontally arranged sequentially, and the fourth convex lens is coaxially arranged with the sample cell Arranged in order and perpendicular to the axes of the second convex lens, the sample cell, and the third convex lens, the two ends of the second optical fiber are respectively connected with the third convex lens and the slit, and the slit is arranged coaxially and horizontally with the second optical filter. The two ends of the three optical fibers are respectively connected with the multi-wavelength laser and the fourth convex lens.

The waterway system includes: several water inlet units, sewage quantitative cup, sewage main drainage pipeline, clean water circulation tank, clean water inlet pump, fourth clean water inlet solenoid valve, fifth clean water inlet solenoid valve, sixth clean water inlet electromagnetic valve Valve, clean water quantitative cup, fourth sewage overflow pipeline, first clean water overflow pipeline, second clean water overflow pipeline, first mixing solenoid valve, second mixing solenoid valve, mixing tank, sample water inlet solenoid valve , sample pool, sample drain solenoid valve, main drain, first sample overflow pipeline and second sample overflow pipeline, etc.;

Each water inlet unit includes: a first sewage water inlet, a first sewage water inlet pump, a first sewage tank, a first sewage water inlet solenoid valve, a first sewage discharge solenoid valve, a first sewage overflow pipeline, and a first clean water Water inlet solenoid valve; wherein, one end of the first sewage water inlet pump is connected to the first sewage water inlet, the other end is connected to the first sewage tank, the first sewage water inlet solenoid valve, the first sewage drainage solenoid valve, and the first sewage overflow pipe road and the first clean water inlet solenoid valve are respectively connected with the first sewage tank, the other end of the first sewage inlet solenoid valve is connected with the sewage quantitative cup outside the water inlet unit, the first sewage discharge solenoid valve and the first sewage overflow The other end of the flow pipeline is connected to the sewage main drainage pipeline outside the water inlet unit, the other end of the first clean water inlet solenoid valve is connected to the clean water inlet pump outside the water inlet unit, and the first sewage discharge solenoid valve is located at the second Under the bottom of a sewage tank; the sewage quantitative cup is respectively connected with the first sewage water inlet electromagnetic valve, the second sewage water inlet electromagnetic valve, the third sewage water inlet electromagnetic valve, the fifth clean water inlet electromagnetic valve, and the fourth sewage overflow The pipeline is connected to the first mixing solenoid valve, the clean water quantitative cup is connected to the fourth clean water inlet solenoid valve, the first clean water overflow pipeline, and the second mixing solenoid valve, and the mixing tank is connected to the sixth clean water inlet solenoid valve, The first mixing solenoid valve, the second mixing solenoid valve, the sample water inlet solenoid valve, and the first sample overflow pipeline are connected, and the sample pool is respectively connected to the sample water inlet solenoid valve, sample drain solenoid valve, and the second sample overflow pipeline The main drain is connected to the sewage main drainage pipeline, the first sample overflow pipeline, and the second sample overflow pipeline respectively. The sewage quantitative cup and the clean water quantitative cup are arranged horizontally, and the sewage quantitative cup and the clean water quantitative cup are located in the second Under the bottoms of the first sewage tank, the second sewage tank and the third sewage tank, the first mixing solenoid valve and the second mixing solenoid valve are respectively located under the bottoms of the sewage quantitative cup and the clean water quantitative cup, and the mixing tank is located at the bottom of the first mixing electromagnetic valve. valve and the second mixing solenoid valve, the sample water inlet solenoid valve is located under the bottom of the mixing tank, the sample cell is located under the bottom of the sample water inlet solenoid valve, the sample drain solenoid valve is located under the bottom of the sample cell, the total drain The outlet is located below the bottom of the sewage main drain line, the first sample overflow line, the second sample overflow line, and the sample drain solenoid valve.

The detection and control system includes: control unit industrial computer, LCD display, keyboard and mouse, power module, spectral detector and digital I/O USB module, etc., among which, LCD display, keyboard and mouse, power module, spectral detector and digital I/O The /O USB modules are respectively connected with the control unit industrial computer; the multi-wavelength lasers of the optical system are respectively connected with the power supply module and the digital I/O USB module, and the pulse xenon lamps of the optical system are respectively connected with the power supply module and the control unit industrial computer; the waterway system The water pumps and solenoid valves are respectively connected to the power supply module and the digital I/O USB module; the sample pool of the waterway system is connected to the multi-wavelength laser of the optical system, the pulsed xenon lamp and the spectral detector of the detection control system.

The beneficial effect of the present invention is that, a multi-spectrum-based multi-point sampling multi-parameter water quality online analysis system simultaneously adopts ultraviolet-visible (UV/Vis) transmission spectrum and fluorescence, Raman and other emission spectra to eliminate various organic pollution of water quality On-line analysis of comprehensive parameters of organic pollutants, making full use of the respective advantages of ultraviolet and fluorescence spectra, realizing complementary information, obtaining a more comprehensive and accurate analysis of water quality, thereby improving the prediction accuracy of organic pollutant parameters. The multi-point sampling and fully automatic design of the system is especially suitable for the application requirements of sewage treatment plants and other places that need to set up water quality monitoring networks in multiple places.

Description of drawings

Fig. 1 is the optical system structure diagram of the multi-point sampling multi-parameter water quality online analysis system based on multi-spectrum;

Fig. 2 is a water system structure diagram of a multi-point sampling multi-parameter water quality online analysis system based on multi-spectrum;

Fig. 3 is a detection and control system structure diagram of the multi-point sampling multi-parameter water quality online analysis system based on multi-spectrum;

Fig. 4 is the analysis system work flowchart of the present invention;

In the figure, the pulsed xenon lamp 1, the first concave mirror 2, the first optical filter 3, the first convex lens 4, the first optical fiber 5, the second convex lens 6, the sample cell 7, the third convex lens 8, the second optical fiber 9, the narrow Slit 10, second optical filter 11, second concave mirror 12, grating 13, charge-coupled element 14, multi-wavelength laser 15, third optical fiber 16, fourth convex lens 17, first sewage water inlet 18 for multi-point sampling, The second sewage water inlet 19, the third sewage water inlet 20, the first sewage water inlet pump 21, the second sewage water inlet pump 22, the third sewage water inlet pump 23, the first sewage tank 24, the second sewage tank 25, the third sewage water tank Tank 26, first sewage water inlet solenoid valve 27, second sewage water inlet solenoid valve 28, third sewage water inlet solenoid valve 29, first sewage drainage solenoid valve 30, second sewage drainage solenoid valve 31, third sewage drainage Solenoid valve 32, sewage quantitative cup 33, first sewage overflow pipeline 34, second sewage overflow pipeline 35, third sewage overflow pipeline 36, sewage main drainage pipeline 37, clean water circulation tank 38, clean water inlet Water pump 39, first clean water inlet solenoid valve 40, second clean water inlet solenoid valve 41, third clean water inlet solenoid valve 42, fourth clean water inlet solenoid valve 43, fifth clean water inlet solenoid valve 44, sixth Clean water inlet solenoid valve 45, clean water quantitative cup 46, fourth sewage overflow pipeline 47, first clean water overflow pipeline 48, second clean water overflow pipeline 49, first mixing solenoid valve 50, second mixing solenoid Valve 51 , mixing tank 52 , sample water inlet solenoid valve 53 , sample drain solenoid valve 54 , main drain 55 , first sample overflow pipeline 56 , second sample overflow pipeline 57 .

Detailed ways

The multi-spectral multi-point sampling multi-parameter water quality online analysis system of the present invention includes: an optical system, a waterway system and a detection control system. Among them, the optical system realizes a series of functions from the light source to emit light, irradiate the sample to the reception of transmitted light, fluorescence, Raman and other emitted light; the water system is connected to the optical system to realize water intake, overflow drainage, quantitative dilution ratio, cleaning, etc. Function; the detection control system is respectively connected with the optical system and the waterway system to realize the detection of the spectral data signal, calculate the analysis value of the water quality parameters, control the automatic operation of each component in the optical system and the waterway system, and realize and User interaction and other functions.

As shown in Figure 1, the optical system includes: a pulsed xenon lamp 1, a first concave mirror 2, a first filter 3, a first convex lens 4, a first optical fiber 5, a second convex lens 6, a sample cell 7, and a third convex lens 8 , second optical fiber 9, slit 10, second optical filter 11, second concave mirror 12, grating 13, charge coupled device 14, multi-wavelength laser 15, third optical fiber 16, fourth convex lens 17.

The positional relationship between the components in Fig. 1 is: the pulse xenon lamp 1 is located at the concave focus of the first concave mirror 2, the first concave mirror 2 is arranged coaxially and horizontally with the first optical filter 3 and the first convex lens 4, and the second The two ends of an optical fiber 5 are respectively connected with the first convex lens 4 and the second convex lens 6. The sample cell 7 is viewed as a square when viewed from above. The second convex lens 6 is arranged coaxially with the sample cell 7 and the third convex lens 8. The sample pool 7 is arranged coaxially and horizontally in sequence and is perpendicular to the axes of the second convex lens 6, the sample pool 7, and the third convex lens 8, and the two ends of the second optical fiber 9 are respectively connected with the third convex lens 8 and the slit 10, and the slit 10 It is arranged coaxially and horizontally with the second optical filter 11 , and the two ends of the third optical fiber 16 are respectively connected with the multi-wavelength laser 15 and the fourth convex lens 17 .

In Fig. 1, the ultraviolet and visible light emitted by the pulsed xenon lamp 1 is reflected by the first concave mirror 2 and becomes parallel light. 6 becomes parallel light and irradiates the sample cell 7, and the transmitted light is received and focused by the third convex lens 8 at a direction of 180° to the incident light, and then sent to the second optical fiber 9, reaches the slit 10, passes through the second optical filter 11, and passes through the second optical fiber 9. The second concave mirror 12 is converted into parallel light and irradiated on the grating 13 to split the light, and finally received and detected by the charge-coupled device 14, and then read by the detection system after being converted into a digital signal; It is composed of lasers with wavelengths in the visible band range. The laser light emitted by the multi-wavelength laser 15 passes through the third optical fiber 16 and is converted into parallel light by the fourth convex lens 17. After that, it is sent into the sample cell 7 to irradiate the sample. direction, the emitted light such as fluorescence and Raman scattering of the sample is focused by the third convex lens 8 and sent to the slit 10 by the second optical fiber 9, filtered by the second filter 11, and reflected by the second concave mirror 12 to the grating 13, the light is split, and finally received and detected by the charge-coupled element 14, which is converted into a digital signal and read by the detection system. After the detection of the emitted light excited by one wavelength of the multi-wavelength laser, the control system switches to the next excitation wavelength according to the built-in program until all the lasers of multiple wavelengths are excited and measured.

As shown in Figure 2, the waterway system of the multi-spectral multi-point sampling multi-parameter water quality online analysis system includes: several water inlet units, sewage quantitative cup 33, sewage main drainage pipeline 37, clean water circulation tank 38, clean water inlet pump 39. Fourth clean water inlet solenoid valve 43, fifth clean water inlet solenoid valve 44, sixth clean water inlet solenoid valve 45, clean water quantitative cup 46, fourth sewage overflow pipeline 47, first clean water overflow pipeline 48. Second clear water overflow pipeline 49, first mixing solenoid valve 50, second mixing solenoid valve 51, mixing tank 52, sample water inlet solenoid valve 53, sample pool 7, sample drain solenoid valve 54, main drain 55 , the first sample overflow pipeline 56, and the second sample overflow pipeline 57.

In the embodiment shown in FIG. 2, there are three sampling points, so there are three water inlet units, but the present invention is not limited thereto. Each water inlet unit has the same structure. Taking the first water inlet unit as an example, the first water inlet unit includes a first sewage water inlet 18, a first sewage water inlet pump 21, a first sewage tank 24, and a first sewage water inlet solenoid valve. 27. The first sewage discharge solenoid valve 30 , the first sewage overflow pipeline 34 , and the first clean water inlet solenoid valve 40 . The connection and positional relationship between the components of the first water inlet unit are as follows: one end of the first sewage water inlet pump 21 is connected to the first sewage water inlet 18, the other end is connected to the first sewage tank 24, the first sewage water inlet solenoid valve 27, The first sewage discharge solenoid valve 30, the first sewage overflow pipeline 34, and the first clean water inlet solenoid valve 40 are respectively connected to the first sewage tank 24, wherein the other end of the first sewage inlet solenoid valve 27 is connected to the water inlet unit The other end of the first sewage discharge solenoid valve 30 and the first sewage overflow pipeline 34 is connected to the sewage general drainage pipeline 37 outside the water inlet unit, and the first clean water inlet solenoid valve The other end of 40 is connected with the clean water inlet pump 39 outside the water inlet unit, and the first sewage discharge solenoid valve 30 is located under the bottom of the first sewage tank 24 .

Except for the water inlet unit in Fig. 2, the connection and positional relationship between the other components are: the sewage quantitative cup 33 is respectively connected to the first sewage water inlet solenoid valve 27, the second sewage water inlet solenoid valve 28, and the third sewage water inlet valve. Solenoid valve 29, the fifth clean water inlet solenoid valve 44, the fourth sewage overflow pipeline 47, and the first mixing solenoid valve 50 are connected, and the clean water quantitative cup 46 is connected with the fourth clean water inlet solenoid valve 43 and the first clean water overflow pipe respectively. The pipeline 48 and the second mixing solenoid valve 51 are connected, and the mixing tank 52 is respectively connected to the sixth clean water inlet solenoid valve 45, the first mixing solenoid valve 50, the second mixing solenoid valve 51, the sample water inlet solenoid valve 53, and the first sample water inlet solenoid valve. The sample overflow pipeline 56 is connected, the sample pool 7 is connected with the sample water inlet solenoid valve 53, the sample discharge solenoid valve 54, and the second sample overflow pipeline 57 respectively, and the total discharge port 55 is connected with the sewage total drainage pipeline 37, the second sample overflow pipeline, respectively. A sample overflow pipeline 56 and a second sample overflow pipeline 57 are connected, the sewage quantitative cup 33 and the clean water quantitative cup 46 are arranged horizontally, and the sewage quantitative cup 33 and the clean water quantitative cup 46 are located in the first sewage tank 24 and the second sewage Below the bottom of the tank 25 and the third sewage tank 26, the first mixing solenoid valve 50 and the second mixing solenoid valve 51 are located under the bottoms of the sewage quantitative cup 33 and the clear water quantitative cup 46 respectively, and the mixing tank 52 is located at the bottom of the first mixing solenoid valve. Below the valve 50 and the second mixing solenoid valve 51, the sample water inlet solenoid valve 53 is located under the bottom of the mixing tank 52, the sample pool 7 is located under the bottom of the sample water inlet solenoid valve 53, and the sample drain solenoid valve 54 is located at the bottom of the sample pool Below the bottom of 7, the total drain 55 is located below the bottom of the sewage total drain 37, the first sample overflow pipeline 56, the second sample overflow pipeline 57, and the sample drain solenoid valve 54.

Taking three sampling points as an example in Fig. 2, at first, the control system selects the current sampling point according to the built-in program. Extracted to the first sewage tank 24, through the switch control of the first sewage water inlet solenoid valve 27 and the first sewage discharge solenoid valve 30, the sewage sample flow rate of the selected sampling point is stably entered into the sewage quantitative cup 33. Sewage is discharged by opening the first sewage drainage solenoid valve 30 or passing through the first sewage overflow pipeline 34, and entering the main drainage outlet 55 through the sewage main drainage pipeline 37; at the same time, the control system is based on the range of water quality parameters of sewage at different sampling points Set the ratio of sewage to clean water, and extract the clean water for dilution from the clean water circulation tank 38 through the clean water inlet pump 39 according to the ratio, open the fourth clean water inlet valve 40 and add the clean water quantitative cup 46, the sewage quantitative cup 33 and clean water The excess sewage sample and clear water in the quantitative cup 46 are discharged through the fourth sewage overflow pipeline 47 and the first clean water overflow pipeline 48 respectively, wherein the excess sewage sample finally enters the main drain through the sewage main drainage pipeline 37 55 is drained away, and the excess clear water flows back to the clear water circulation tank 38; then, after the sewage sample and clear water in the sewage quantitative cup 33 and the clear water quantitative cup 46 reach a stable proportioning volume, the control system opens the first mixing solenoid valve 50 and the second mixing solenoid valve 51 to add the two into the mixing tank 52. After the sample is mixed uniformly and stably, the sample water inlet solenoid valve 53 is opened to send the diluted and uniformly mixed sample into the sample pool 7 for optical detection and spectral data analysis. After collection and detection, open the sample drainage solenoid valve 54 to drain the sample through the main drain 55, wherein if any sample overflows in the mixing tank 52 and the sample pool 7, it will pass through the first sample overflow pipeline 56 and the second sample overflow line 56 respectively. The overflow line 57 enters the main drain 55 to be drained. In addition, the cleaning process of the sewage pipeline system is as follows: the control system pumps clean water for cleaning by turning on the clean water inlet pump 39, and controls the first clean water inlet solenoid valve 40, the second clean water inlet solenoid valve 41, and the third clean water inlet solenoid valve. Valve 42, the switch of the fifth clean water inlet solenoid valve 44, the sixth clean water inlet solenoid valve 45, and control of the first sewage discharge solenoid valve 30, the second sewage discharge solenoid valve 31, the third sewage discharge solenoid valve 32, mixing The solenoid valve 50, the sample water inlet solenoid valve 53, and the sample drain solenoid valve 54 are switched to send clean water into the first sewage tank 24, the second sewage tank 25, the third sewage tank 26, the sewage quantitative cup 33, and the mixing tank 52 respectively. The cleaning of the sewage pipeline system is carried out in the sample tank 7, and the water after cleaning finally enters the main drain 55 and is drained away.

As shown in Figure 3, the detection and control system of the multi-point sampling and multi-parameter water quality online analysis system based on multi-spectrum includes: control unit industrial computer, LCD display, keyboard and mouse, power module, spectral detector, digital I/O USB module . The connection relationship between the components is as follows: LCD display screen, keyboard and mouse, power supply module, spectrum detector and digital I/O USB module are respectively connected to the control unit industrial computer; the multi-wavelength laser of the optical system is respectively connected to the power supply module and digital I/O /O USB module is connected, the pulse xenon lamp of the optical system is connected with the power supply module and the control unit industrial computer respectively; the water pumps and solenoid valves of the waterway system are connected with the power supply module and the digital I/O USB module respectively; the sample pools of the waterway system are respectively connected It is connected with the multi-wavelength laser of the optical system, the pulsed xenon lamp and the spectral detector of the detection control system.

Among them, the industrial computer is the center of the entire detection and control system, controlling the start and operation of each module, embedded with the operating system and multi-spectral multi-parameter water quality online analysis software, providing data interfaces for two groups of light sources and spectral detectors, and providing various Overvoltage and overcurrent protection to ensure the safety of the circuit of the instrument; LCD display, keyboard and mouse are devices that interact with the user. The user sends various commands through the keyboard operation panel, and the LCD display reads the measurement results and obtains operation prompts; power supply The module supplies power to the entire system under the action of the control system; for the multi-wavelength laser of the optical system, the control unit industrial computer sends instructions through the digital I/O USB module to realize the switch, power control and wavelength switching of the multi-wavelength laser; for the optical The pulse xenon light source of the system is sent by the control unit industrial computer through the USB interface to realize the soft switch and power control of the optical path, so as to measure with the excitation-emission optical path in time, and adjust the light source power and Integrate time to obtain appropriate signal strength; the spectrum detector receives the instruction of the detection control system through the USB interface and regularly uploads the collected spectral data to the control unit industrial computer; for each water pump and solenoid valve of the waterway system, the control unit industrial computer Send instructions through the digital I/O USB module to realize the switch control of each water pump and solenoid valve.

As shown in Figure 4, the workflow of the analysis system of the present invention is as follows: the user presses the power button, the system starts to start, and at the same time, the pulsed xenon lamp of the transmitted light source is lit and stabilized by itself. After the system is started, the program issues instructions to initialize the LCD screen, digital I/O USB module, and spectral detector, and then asks the user to confirm the initial settings such as the sampling time interval and the ratio of multi-point sampling, and then the system enters the standby state. If the set detection time is up or the user chooses to start detection through the keyboard and mouse, the analysis system will start to work. Firstly, the pipeline is cleaned, and then the sewage sampling point is selected to enter the water, and according to the setting of the control system, it is diluted with clean water and sent to the sample pool. After that, the excitation-emission light path starts to work, and the emission spectrum signal is detected. After one emission spectrum detection is completed, the system judges whether all emission spectrum detections are completed (taking a multi-wavelength laser composed of lasers with three wavelengths of 266nm, 355nm, and 532nm as an example, it is judged whether the laser switching keyword k is 3). If the emission spectrum detection is not completed, set the laser switching keyword k=k+1, turn off the original laser, turn on the next laser, change the excitation wavelength, detect and store again; if the emission spectrum detection has been completed, start Transmission spectrum detection, record transmission spectrum data. After the detection of a sample is completed, the detection data is sent to the industrial computer detection and control system for model calculation and processing, and the detection values of multiple water quality parameters such as COD and TOC are obtained, and the measurement results are displayed on the LCD screen, and the system judges the detection of all sewage sampling points at the same time Whether it has been completed (taking three sampling points as an example, it is judged whether the switching keyword n of the sampling point is 3). If the sampling point has not been detected, set the sampling point switching keyword n=n+1 to start the water intake and detection process of a new sampling point; if all the sampling points have been detected, the system returns to the standby state. Wait for the next sampling moment or a new instruction from the user.

Claims (1)

1. A multi-spectral multi-point sampling multi-parameter water quality online analysis system is characterized in that it includes an optical system, a waterway system and a detection and control system; Among them, the optical system includes: a pulsed xenon lamp (1), a first concave mirror (2), a first optical filter (3), a first convex lens (4), a first optical fiber (5), a second convex lens (6), Sample cell (7), third convex lens (8), second optical fiber (9), slit (10), second optical filter (11), second concave mirror (12), grating (13), charge coupled Element (14), multi-wavelength laser (15), third optical fiber (16), fourth convex lens (17), etc.; the pulsed xenon lamp (1) is located at the concave focus of the first concave mirror (2), and the first concave mirror ( 2) Arranged coaxially and horizontally with the first optical filter (3) and the first convex lens (4), the two ends of the first optical fiber (5) are respectively connected with the first convex lens (4) and the second convex lens (6), The second convex lens (6) is arranged coaxially and horizontally with the sample cell (7) and the third convex lens (8), and the fourth convex lens (17) is arranged coaxially and horizontally with the sample cell (7) and arranged with the second convex lens (6) , the axis of the sample cell (7), and the third convex lens (8) are perpendicular to each other, and the two ends of the second optical fiber (9) are respectively connected with the third convex lens (8) and the slit (10), and the slit (10) is connected with the Two optical filters (11) are coaxially and horizontally arranged sequentially, and the two ends of the third optical fiber (16) are respectively connected with the multi-wavelength laser (15) and the fourth convex lens (17); The waterway system includes: several water inlet units, sewage quantitative cup (33), sewage main drainage pipeline (37), clean water circulation tank (38), clean water inlet pump (39), fourth clean water inlet solenoid valve (43) , the fifth clean water inlet solenoid valve (44), the sixth clean water inlet solenoid valve (45), the clean water quantitative cup (46), the fourth sewage overflow pipeline (47), the first clean water overflow pipeline (48 ), the second clear water overflow pipeline (49), the first mixing solenoid valve (50), the second mixing solenoid valve (51), the mixing tank (52), the sample water inlet solenoid valve (53), the sample cell (7 ), sample drain solenoid valve (54), main drain (55), first sample overflow pipeline (56) and second sample overflow pipeline (57), etc.; Each water inlet unit includes: a first sewage water inlet (18), a first sewage water inlet pump (21), a first sewage tank (24), a first sewage water inlet solenoid valve (27), and a first sewage drainage solenoid valve (30), the first sewage overflow pipeline (34), the first clean water inlet solenoid valve (40); wherein, one end of the first sewage inlet pump (21) is connected to the first sewage inlet (18), and the other end Connect the first sewage tank (24), the first sewage inlet solenoid valve (27), the first sewage drainage solenoid valve (30), the first sewage overflow pipeline (34), the first clean water inlet solenoid valve (40 ) are respectively connected to the first sewage tank (24), the other end of the first sewage water inlet solenoid valve (27) is connected to the sewage quantitative cup (33) outside the water inlet unit, the first sewage drainage solenoid valve (30) and The other end of the first sewage overflow pipeline (34) is connected to the sewage main drainage pipeline (37) outside the water inlet unit, and the other end of the first clean water inlet solenoid valve (40) is connected to the sewage main drainage pipeline (37) outside the water inlet unit. The clean water inlet pump (39) is connected, and the first sewage discharge solenoid valve (30) is located under the bottom of the first sewage tank (24); the sewage quantitative cup (33) is respectively connected to the first sewage water inlet solenoid valve (27), the second The second sewage water inlet solenoid valve (28), the third sewage water inlet solenoid valve (29), the fifth clean water inlet solenoid valve (44), the fourth sewage overflow pipeline (47), the first mixing solenoid valve (50 ), the clean water quantitative cup (46) is connected with the fourth clean water inlet solenoid valve (43), the first clean water overflow pipeline (48), and the second mixing solenoid valve (51), and the mixing tank (52) is connected with the The sixth clean water inlet solenoid valve (45), the first mixing solenoid valve (50), the second mixing solenoid valve (51), the sample water inlet solenoid valve (53), and the first sample overflow pipeline (56) are connected , the sample tank (7) is respectively connected with the sample inlet solenoid valve (53), the sample drain solenoid valve (54), and the second sample overflow pipeline (57), and the main drain outlet (55) is respectively connected with the sewage main drain pipeline (37), the first sample overflow pipeline (56), and the second sample overflow pipeline (57) are connected, the sewage quantitative cup (33) and the clean water quantitative cup (46) are arranged horizontally, the sewage quantitative cup (33) and the clean water quantitative cup (46) are located under the bottom of the first sewage tank (24), the second sewage tank (25) and the third sewage tank (26), the first mixing solenoid valve (50) and the second mixing solenoid valve (51) are respectively located under the bottom of the sewage quantitative cup (33) and the clean water quantitative cup (46), the mixing tank (52) is located under the first mixing solenoid valve (50) and the second mixing solenoid valve (51), the sample The water inlet solenoid valve (53) is located under the bottom of the mixing tank (52), the sample pool (7) is located under the bottom of the sample water inlet solenoid valve (53), and the sample drain solenoid valve (54) is located under the sample pool (7) Under the bottom of the bottom, the main drain (55) is located in the sewage main drain line (37), the first sample overflow line (56), the second sample overflow line (57), the sample drain solenoid valve (54 ) below the bottom; The detection and control system includes: control unit industrial computer, LCD display, keyboard and mouse, power module, spectral detector and digital I/O USB module, etc., among which, LCD display, keyboard and mouse, power module, spectral detector and digital I/O The /O USB modules are respectively connected with the control unit industrial computer; the multi-wavelength lasers of the optical system are respectively connected with the power supply module and the digital I/O USB module, and the pulse xenon lamps of the optical system are respectively connected with the power supply module and the control unit industrial computer; the waterway system The water pumps and solenoid valves are respectively connected to the power supply module and the digital I/O USB module; the sample pool of the waterway system is connected to the multi-wavelength laser of the optical system, the pulsed xenon lamp and the spectral detector of the detection control system.

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