Exhaust gas treatment fluid detection method, terminal, exhaust gas treatment fluid detection system, and medium

Abstract

The application provides a tail gas treatment liquid detection method, a terminal, a tail gas treatment liquid detection system and a medium. First, conductivity change information detected by a first conductivity detector, an organic matter chromatogram obtained by detection of an ultraviolet detector and inorganic salt chromatogram detected by a second conductivity detector are acquired. Then, according to the organic matter chromatogram, the conductivity change information and a first target recognition model, organic matter content information is determined. Next, according to the inorganic salt chromatogram, the conductivity change information and a second target recognition model, inorganic salt content information is determined. Finally, according to the organic matter content information and the inorganic salt content information, a detection result of the tail gas treatment liquid is determined. By setting the conductivity detector in the pretreatment process, the conductivity change of the liquid is detected, so that the separation effect of the organic matter and the inorganic salt is estimated, which is input into the original chromatogram recognition, so that the recognition accuracy of the chromatogram is improved, and the poor detection effect caused by the poor separation effect is avoided.

Description

Technical Field

[0001] This invention belongs to the field of component detection technology, and particularly relates to a method, terminal, system and medium for detecting exhaust gas treatment fluid. Background Technology

[0002] NOx and other major components in diesel vehicle exhaust pose significant health risks and pollute the environment. Therefore, diesel vehicles are typically equipped with exhaust gas treatment fluid. This fluid usually consists of 32.5% high-purity urea and 67.5% deionized water, which reacts with NOx in the exhaust to produce harmless nitrogen and water. Therefore, the quality of the exhaust gas treatment fluid is crucial. Poor quality fluid can not only affect the efficiency of exhaust gas treatment but may also damage the engine in severe cases.

[0003] In related technologies, extraction columns are typically used to separate organic matter and inorganic salts in exhaust gas treatment liquids. Then, liquid chromatography and ion chromatography are used to detect organic matter and inorganic salts respectively. However, this method is highly dependent on the separation effect of the extraction column. If the separation is poor, the residual organic matter will affect the detection of inorganic salts, and similarly, the residual inorganic salts will affect the detection of organic matter. Therefore, the existing technology has poor detection effect on exhaust gas treatment liquids. Summary of the Invention

[0004] In view of this, the present invention provides a method, terminal, system and medium for detecting exhaust gas treatment fluid, aiming to solve the problem of poor detection effect of exhaust gas treatment fluid in the prior art.

[0005] A first aspect of this invention provides a method for detecting exhaust gas treatment fluid, applied to a terminal in an exhaust gas treatment fluid detection system. The exhaust gas treatment fluid detection system includes an exhaust gas treatment fluid detection device; the exhaust gas treatment fluid detection device includes a pretreatment unit, a liquid phase detection unit, and an ion detection unit.

[0006] The pretreatment unit is equipped with a first conductivity detector; the liquid phase detection unit is equipped with an ultraviolet detector; and the ion detection unit is equipped with a second conductivity detector.

[0007] The method includes:

[0008] The system acquires conductivity change information detected by the first conductivity detector, chromatograms of organic compounds obtained by the ultraviolet detector, and chromatograms of inorganic salts detected by the second conductivity detector.

[0009] Based on the organic matter chromatogram, conductivity change information, and the first target identification model, the organic matter content information of the exhaust gas treatment liquid is determined;

[0010] Based on the inorganic salt chromatogram, conductivity change information, and the second target identification model, the inorganic salt content information of the exhaust gas treatment liquid is determined.

[0011] The test results of the exhaust gas treatment fluid are determined based on the information on organic matter content and inorganic salt content.

[0012] A second aspect of the present invention provides a terminal including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the steps of the exhaust gas treatment liquid detection method of the first aspect described above.

[0013] A third aspect of the present invention provides an exhaust gas treatment fluid detection system, comprising: an exhaust gas treatment fluid detection device and a terminal as described in the second aspect above.

[0014] A fourth aspect of the present invention provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the exhaust gas treatment liquid detection method of the first aspect above.

[0015] The exhaust gas treatment liquid detection method, terminal, system, and medium provided in this invention first acquire conductivity change information detected by a first conductivity detector, organic chromatograms detected by an ultraviolet detector, and inorganic salt chromatograms detected by a second conductivity detector. Then, based on the organic chromatograms, conductivity change information, and a first target recognition model, the organic content information of the exhaust gas treatment liquid is determined. Next, based on the inorganic salt chromatograms, conductivity change information, and the second target recognition model, the inorganic salt content information of the exhaust gas treatment liquid is determined. Finally, based on the organic and inorganic salt content information, the detection result of the exhaust gas treatment liquid is determined. By setting a conductivity detector during the pretreatment process to detect changes in the liquid's conductivity, the separation effect of organic matter and inorganic salts can be estimated and used as input to the original chromatogram recognition, thereby improving the accuracy of chromatogram recognition and avoiding poor detection results caused by poor separation effects. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the exhaust gas treatment liquid detection system provided in an embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of the exhaust gas treatment liquid detection device provided in an embodiment of the present invention;

[0019] Figure 3 This is a flowchart illustrating the implementation of the exhaust gas treatment liquid detection method provided in this embodiment of the invention. Detailed Implementation

[0020] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of the invention. However, those skilled in the art will understand that the invention can be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods are omitted so as not to obscure the description of the invention with unnecessary detail.

[0021] Figure 1 This is a schematic diagram of the exhaust gas treatment liquid detection system provided in an embodiment of the present invention. Figure 1 As shown, in some embodiments, the exhaust gas treatment fluid detection system may include an exhaust gas treatment fluid detection device 11 and a terminal 12.

[0022] Terminal 12 is connected to the exhaust gas treatment fluid detection device 11 and is used to control the operation of the equipment in the exhaust gas treatment fluid detection device 11 and collect the operation / detection data of these devices to realize the detection of exhaust gas treatment fluid. Terminal 12 can be a mobile phone, computer, etc., and is not limited here.

[0023] For exhaust gas treatment fluids, excessively high urea content will cause the remaining urea to hydrolyze under high-temperature conditions, producing NH3 and CO2, resulting in secondary pollution to the SCR (Selective Catalytic Reduction) system; conversely, excessively low urea content will reduce the removal of NO from the exhaust gas. x The reduction efficiency is low, resulting in some NO remaining. x Unreduced urea is directly released into the atmosphere. Studies have shown that the crystallization point of the product is lowest when the urea content is 32.5%. Higher or lower urea content will increase the crystallization point, leading to blockage of urea infusion pipes, nozzles, exhaust pipes, and even engine damage.

[0024] Furthermore, because the diesel exhaust fluid reacts directly with the catalyst in the SCR system, trace amounts of biuret within it can further condense and polymerize to form cyanuric acid, which has a melting point greater than 300°C, and adhere to the catalyst, thereby reducing the catalyst's effectiveness against NO. x The conversion efficiency is also affected by factors such as the content of inorganic salts including fluorides, chlorides, nitrites, bromides, nitrates, phosphates, sulfites, and sulfates. x Conversion efficiency.

[0025] Figure 2This is a schematic diagram of the exhaust gas treatment liquid detection device provided in an embodiment of the present invention. Figure 2 As shown, in some embodiments, the exhaust gas treatment liquid detection device includes: a pretreatment unit 21, a liquid phase detection unit 22, an ion detection unit 23, and an eight-way valve 24; the pretreatment unit 21 is connected to the liquid phase detection unit 22 and the ion detection unit 23 respectively through the eight-way valve 24.

[0026] The pretreatment unit 21 includes a first delivery pump 211, an injector 212, an extraction column 213, and a first conductivity detector 214.

[0027] The liquid phase detection unit 22 also includes a second delivery pump 221, a first enrichment column 222, a first analytical column 223, and an ultraviolet detector 224.

[0028] The ion detection unit 23 also includes a third delivery pump 231, a second enrichment column 232, a guard column 233, a second analysis column 234, a suppressor 235, and a second conductivity detector 236.

[0029] The first delivery pump 211 is connected to one end of the extraction column 213, the injector 212 is located between the first delivery pump 211 and the extraction column 213, and the other end of the extraction column 213 is connected to port 1 of the eight-way valve 24.

[0030] The second delivery pump 221 is connected to port 7 of the eight-way valve 24, one end of the first enrichment column 222 is connected to port 8 of the eight-way valve 24, and the other end is connected to the first analysis column 223. The first analysis column 223 is connected to the ultraviolet detector 224.

[0031] The third delivery pump 231 is connected to port 5 of the eight-way valve 24. The two ends of the second enrichment column 232 are connected to ports 2 and 3 of the eight-way valve 24, respectively. One end of the protection column 233 is connected to port 4 of the eight-way valve 24, and the other end is connected to the second analysis column 234, the suppressor 235, and the second conductivity detector 236 in sequence.

[0032] Each device in the aforementioned exhaust gas treatment fluid detection device can be controlled by a terminal. The terminal is used to execute the following steps. During the use of the 8-way valve in each of the following steps, unless otherwise stated, the interface is in the closed state:

[0033] Step 1: Control the first transfer pump 211 to deliver a first eluent in a first preset ratio to the pre-processing unit 21; control the second transfer pump 221 to deliver a second eluent in a second preset ratio to the pre-processing unit; control the third transfer pump 231 to deliver a third eluent of a preset concentration to the pre-processing unit. Both the first and second eluents are composed of methanol and water; the third eluent is an aqueous solution of methanesulfonic acid. The first eluent in the first ratio is a 55:45 ratio of methanol to water, the second eluent in the second preset ratio is a 5:95 ratio of methanol to water, and the preset concentration is 20 mol / L. In this step, ports 1 and 6, 7 and 8, 5 and 2, and 3 and 4 of the eight-way valve are connected.

[0034] Step 2: Control the injector 212 to inject the sample, so that the sample to be tested remains in the extraction column 213. The extraction column 213 can be a 2.5 ml reversed-phase high-performance liquid extraction column, a C18 online solid-phase extraction column, etc., and is not limited here.

[0035] Step 3: Connect ports 1 and 2 of the eight-way valve 24 to enrich the inorganic salts in the extraction column 213 onto the second enrichment column 232. Simultaneously, the first conductivity detector 214 monitors the conductivity changes in the pretreatment unit 21 in real time. In this step, because the retention of inorganic salts on the extraction column is relatively weak, after connecting ports 1 and 2, the eluent flows to the second enrichment column 232, where the inorganic salts in the extraction column 213 will gradually accumulate. After a preset time t1, enrichment is considered complete. The value of t1 can be determined experimentally and is not limited here.

[0036] Step 4: Connect port 1 and port 8 of the eight-way valve 24 to enrich the organic matter in the extraction column 213 onto the first enrichment column 222. The first conductivity detector 214 detects the change in conductivity in the pretreatment unit 21 in real time. At the same time, connect port 3 and port 4 of the eight-way valve 24 to control the third delivery pump 231 to use the first eluent to perform gradient elution of the inorganic salts on the second enrichment column 222. The eluted inorganic salts are separated by the second analytical column 234 so that the second conductivity detector 236 can detect the inorganic salt chromatogram of the sample to be tested.

[0037] In the exhaust gas treatment liquid, inorganic components are considered impurities and exist only in small amounts. Steps 2 and 3 above are equivalent to impurity separation. Due to the complexity and low content of inorganic salts, subsequent analysis requires a significant amount of time. Therefore, inorganic salts are separated first, followed by the enrichment and analysis of organic matter. In this step, enrichment is considered complete after a preset time t2. The value of t2 can be experimentally determined and is not limited here. During the organic matter enrichment process, inorganic salt analysis is performed simultaneously. Guard column 233 is an anion exchange guard column, and the second analytical column 234 is an anion exchange analytical column. The first eluent is a 4-6 mmol / L sodium bicarbonate solution, the flow rate is 1 ml / min, the suppressor current is 40 mA, and the column temperature is 30 °C.

[0038] After the organic matter enrichment in step 4 is completed, step 5 should be performed immediately, without waiting for inorganic salt analysis.

[0039] Step 5: Connect port 7 and port 8 of the eight-way valve 24 to control the second delivery pump 21 to use the second eluent to perform gradient elution of the organic matter on the first enrichment column 222, so that the eluted inorganic salts are separated by the second analytical column 223, so that the ultraviolet detector 224 can detect the organic chromatogram of the sample to be tested.

[0040] In this step, the second analytical column 223 is a C18 type chromatographic column, the second eluent is a 5:95 methanol and potassium dihydrogen phosphate solution, the flow rate is 1 ml / min, and the column temperature is 30℃.

[0041] The conductivity changes, inorganic salt chromatograms, and organic chromatograms obtained from steps 4 and 5 above are input into the terminal for qualitative and quantitative analysis, thereby determining the composition and content information of the exhaust gas treatment liquid to be tested.

[0042] Figure 3 This is a flowchart illustrating the implementation of the exhaust gas treatment liquid detection method provided in this embodiment of the invention. Figure 3 As shown, in some embodiments, the exhaust gas treatment fluid detection method includes:

[0043] S310, acquire the conductivity change information detected by the first conductivity detector, the organic chromatogram obtained by the ultraviolet detector, and the inorganic salt chromatogram detected by the second conductivity detector.

[0044] In this embodiment of the invention, the first conductivity detector only detects changes in the conductivity of the pretreatment unit. As inorganic salts and organic matter gradually accumulate in the exhaust gas treatment liquid, the conductivity of the solution in the pretreatment unit will gradually change. The detection wavelength of the ultraviolet detector is 197 nm.

[0045] S320 determines the organic content information of the exhaust gas treatment liquid based on the organic chromatogram, conductivity change information, and the first target identification model.

[0046] S330 determines the inorganic salt content information of the exhaust gas treatment liquid based on the inorganic salt chromatogram, conductivity change information, and the second target identification model.

[0047] In this embodiment of the invention, the first target recognition model can be a convolutional neural network model, a deep learning model, etc., and is not limited thereto. Similarly, the second target recognition model can also be a convolutional neural network model, a deep learning model, etc., and is not limited thereto.

[0048] S340, based on the information on organic matter content and inorganic salt content, determines the test results of the exhaust gas treatment liquid.

[0049] In this embodiment of the invention, after measuring the content of each organic compound and inorganic salt, the detection result can be determined based on the preset content threshold corresponding to each substance.

[0050] For example, the urea content needs to be between 31.8% and 33.3%. If the urea content is found to be 31.0%, the test result of the exhaust gas treatment fluid is unqualified.

[0051] In some embodiments, the difference between the content of each substance and its corresponding preset content threshold can be calculated, divided by the preset content threshold, and then multiplied by the weight set for each substance to obtain a weighted final quality score. The quality of the exhaust gas treatment liquid is then determined according to multiple preset scoring thresholds. For example, the preset content threshold for urea can be 32.5%.

[0052] In some embodiments, the conductivity change information is the conductivity change curve of the eluent in the pretreatment unit during a first time period and a second time period; the first time period is the time period during which inorganic salts on the elution extraction column of the pretreatment unit are eluted; the second time period is the time period during which organic matter on the elution extraction column of the pretreatment unit is eluted.

[0053] Accordingly, S320 may include: calculating the first distance between the conductivity change curve and the first standard curve within the first time period; and determining the organic content information of the exhaust gas treatment liquid based on the organic chromatogram, the first distance, and the first target identification model.

[0054] In this embodiment of the invention, at low concentrations, the conductivity mainly depends on the ionization of each substance. Most soluble inorganic salts are strong electrolytes. As the inorganic salt decreases, the conductivity of the eluent can be approximated as decreasing linearly. However, urea accounts for a relatively high proportion in the test solution. Urea is a weak electrolyte. As the urea decreases, the degree of ionization increases, and its conductivity changes non-linearly.

[0055] If the pretreatment process fails to effectively separate organic matter from inorganic salts, these inorganic salts will act as impurities and affect the organic chromatogram. To avoid this effect, the organic matter extracted in the extraction column consists of a large amount of urea and a trace amount of biuret. Therefore, the change in conductivity usually follows the change in urea concentration, which is a regular nonlinear process. A first standard curve can be obtained by pre-testing and measuring the conductivity of pure urea dissolved in the eluent at different concentrations. In this invention, during the organic enrichment process, the change in conductivity can be detected, a conductivity change curve within a first time period can be plotted, and the distance or correlation between the curve and the first standard curve can be calculated. This information is then added to the input of a neural network to avoid the influence of inorganic impurities on the organic chromatogram.

[0056] Accordingly, S330 may include: calculating the second distance between the conductivity change curve and the second standard curve during the second time period; and determining the inorganic salt content information of the exhaust gas treatment liquid based on the inorganic salt chromatogram, the second distance, and the second target identification model.

[0057] In this embodiment of the invention, similar to the previous embodiment, the conductivity of inorganic substances at different concentrations in the eluent can be plotted to obtain a second standard curve. Similarly, in the inorganic salt enrichment process of this invention, conductivity changes can be detected, conductivity change curves in the second time period can be plotted, and the distance or correlation between the curve and the second standard curve can be calculated and added to the input of the neural network to avoid the influence of organic impurities on the inorganic salt chromatogram.

[0058] In some embodiments, the method further includes: developing multiple groups of first standard samples; wherein each first standard sample in each group has the same amount of organic matter, and the organic matter content in the first standard samples of each group is different; for each group of first standard samples, adding an inorganic salt of random amount to each first standard sample in that group to obtain a first training sample, and recording the first content information of organic matter and the second content information of inorganic salt in the first training sample; obtaining a first distance corresponding to the first training sample, and obtaining the chromatogram of the first training sample by the ultraviolet detector; using the chromatogram of the first training sample corresponding to each group of first standard samples and the first distance corresponding to the first training sample as input, and the first content information and the second content information as output, forming a first training set to train the first target recognition model.

[0059] In some embodiments, the method further includes: developing multiple sets of second standard samples; each second standard sample in each set has the same amount of inorganic matter, and the inorganic matter content in the second standard samples of each set is different; for each set of second standard samples, adding a random amount of organic matter to each second standard sample in that set to obtain a second training sample, and recording the third content information of organic matter and the fourth content information of inorganic salts in the second training sample; obtaining the second distance corresponding to the second training sample, and obtaining the chromatogram of the second training sample by the ultraviolet detector; using the chromatogram of the second training sample corresponding to each set of second standard samples and the second distance corresponding to the second training sample as input, and the third content information and the fourth content information as output, forming a second training set to train the second target recognition model.

[0060] In summary, the beneficial effects of the present invention are as follows:

[0061] 1. By setting a conductivity detector during the pretreatment process to detect changes in the conductivity of the liquid, the separation effect of organic matter and inorganic salts can be predicted. This result can be used as input to the original chromatogram recognition, thereby improving the accuracy of chromatogram recognition and avoiding poor detection results caused by poor separation.

[0062] 2. This invention differs from conventional detection methods in that conventional complex solution detection typically involves various impurities or irrelevant substances in addition to the organic and inorganic ions to be detected. These substances can all affect the detection. After separating various substances using an extraction column and undergoing an enrichment process, a large amount of impurities remain on the extraction column, requiring the pretreatment unit to be cleaned with eluent before the next use. This invention is specifically designed for exhaust gas treatment liquids, which contain only urea, biuret, and some specific inorganic salt ions, and no other substances. Therefore, after enriching inorganic salts and organic matter separately, there are no large amounts of impurities on the extraction column, eliminating the need for repeated cleaning of the extraction column. This significantly reduces detection time when detecting large batches of exhaust gas treatment liquids.

[0063] 3. This invention requires only an eight-way valve and an additional conductivity detector to achieve the joint detection of organic matter and inorganic salts in the exhaust gas treatment liquid. The structure is simple and the detection process is concise.

[0064] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0065] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0066] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A method for detecting exhaust gas treatment fluid, characterized in that, A terminal for use in an exhaust gas treatment fluid detection system, the exhaust gas treatment fluid detection system including an exhaust gas treatment fluid detection device; the exhaust gas treatment fluid detection device includes a pretreatment unit, a liquid phase detection unit, and an ion detection unit; The pretreatment unit is equipped with a first conductivity detector; the liquid phase detection unit is equipped with an ultraviolet detector. The ion detection unit is equipped with a second conductivity detector; The method includes: The system acquires conductivity change information detected by the first conductivity detector, chromatograms of organic compounds obtained by the ultraviolet detector, and chromatograms of inorganic salts detected by the second conductivity detector. Based on the organic chromatogram, conductivity change information, and the first target identification model, the organic content information of the exhaust gas treatment liquid is determined; Based on the inorganic salt chromatogram, conductivity change information, and the second target identification model, the inorganic salt content information of the exhaust gas treatment liquid is determined. The detection results of the exhaust gas treatment liquid are determined based on the organic matter content information and the inorganic salt content information.

2. The method for detecting exhaust gas treatment fluid according to claim 1, characterized in that, The conductivity change information is the conductivity change curve of the eluent in the pretreatment unit during the first time period and the second time period; the first time period is the period during which inorganic salts on the elution extraction column of the pretreatment unit are eluted; the second time period is the period during which organic matter on the elution extraction column of the pretreatment unit is eluted. The step of determining the organic matter content information of the exhaust gas treatment liquid based on the organic matter chromatogram, conductivity change information, and the first target recognition model includes: Calculate the first distance between the conductivity change curve and the first standard curve during the first time period; Based on the organic chromatogram, the first distance, and the first target recognition model, the organic content information of the exhaust gas treatment liquid is determined; Based on the inorganic salt chromatogram, conductivity change information, and the second target identification model, the inorganic salt content information of the exhaust gas treatment liquid is determined, including: Calculate the second distance between the conductivity change curve and the second standard curve during the second time period; The inorganic salt content information of the exhaust gas treatment liquid is determined based on the inorganic salt chromatogram, the second distance, and the second target recognition model.

3. The method for detecting exhaust gas treatment fluid according to claim 2, characterized in that, The method further includes: Multiple sets of primary standard samples were prepared; each primary standard sample in each set had the same amount of organic matter, but the amount of organic matter in the primary standard samples of each set was different. For each group of first standard samples, an inorganic salt of random content is added to each first standard sample in the group to obtain a first training sample, and the first content information of organic matter and the second content information of inorganic salt in the first training sample are recorded; the first distance corresponding to the first training sample is obtained, and the chromatogram of the first training sample by the ultraviolet detector is obtained; The first training set is formed by taking the chromatograms of the first training samples corresponding to the first standard samples in each group and the first distance corresponding to the first training samples as inputs, and the first content information and the second content information as outputs, and then training the first target recognition model.

4. The method for detecting exhaust gas treatment fluid according to claim 3, characterized in that, The method further includes: Multiple sets of second standard samples were prepared; each second standard sample in each set had the same amount of inorganic matter, but the amount of inorganic matter in the second standard samples in each set was different. For each group of second standard samples, add a random amount of organic matter to each second standard sample in that group to obtain a second training sample, and record the third content information of organic matter and the fourth content information of inorganic salts in the second training sample; obtain the second distance corresponding to the second training sample, and obtain the chromatogram of the second training sample by the ultraviolet detector; The second training set is formed by taking the chromatograms of the second training samples corresponding to the second standard samples of each group and the second distance corresponding to the second training samples as inputs, and the third content information and the fourth content information as outputs, and then training the second target recognition model.

5. A terminal, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the exhaust gas treatment liquid detection method according to any one of claims 1 to 4.

6. A tail gas treatment fluid detection system, characterized in that, include: The exhaust gas treatment fluid detection device and the terminal as described in claim 5 above.

7. The exhaust gas treatment fluid detection system according to claim 6, characterized in that, The exhaust gas treatment liquid detection device includes: a pretreatment unit, a liquid phase detection unit, an ion detection unit, and an eight-way valve; the pretreatment unit is connected to the liquid phase detection unit and the ion detection unit respectively through the eight-way valve; The pretreatment unit is equipped with a first conductivity detector; the liquid phase detection unit is equipped with an ultraviolet detector; the ion detection unit is equipped with a second conductivity detector; the first conductivity detector, the second conductivity detector, and the ultraviolet detector are all connected to the terminal.

8. The exhaust gas treatment fluid detection system according to claim 7, characterized in that, The pretreatment unit also includes a first delivery pump, an injector, and an extraction column; The liquid phase detection unit also includes a second delivery pump, a first enrichment column, and a first analysis column; The ion detection unit also includes a third delivery pump, a second enrichment column, a guard column, a second analytical column, and a suppressor; The first delivery pump is connected to one end of the extraction column, the injector is disposed between the first delivery pump and the extraction column, and the other end of the extraction column is connected to port 1 of the eight-way valve. The second delivery pump is connected to port 7 of the eight-way valve, one end of the first enrichment column is connected to port 8 of the eight-way valve, and the other end is connected to the first analysis column. The first analysis column is connected to the ultraviolet detector. The third delivery pump is connected to port 5 of the eight-way valve. The two ends of the second enrichment column are connected to ports 2 and 3 of the eight-way valve, respectively. One end of the protection column is connected to port 4 of the eight-way valve, and the other end is connected to the second analysis column, the suppressor, and the second conductivity detector in sequence.

9. The exhaust gas treatment fluid detection system according to claim 8, characterized in that, The terminal is used to perform the following steps: The system controls a first delivery pump to deliver a first eluent in a first preset ratio to the preprocessing unit, controls a second delivery pump to deliver a second eluent in a second preset ratio to the liquid phase detection unit, and controls a third delivery pump to deliver a third eluent of a preset concentration to the ion detection unit; wherein the first and second eluents are both composed of methanol and water; and the third eluent is an aqueous solution of methanesulfonic acid. Control the injection of the sample via the injector so that the sample to be tested remains in the extraction column; Connect port 1 and port 2 of the eight-way valve to enrich the inorganic salt in the extraction column onto the second enrichment column. At the same time, the first conductivity detector detects the change in conductivity in the pretreatment unit in real time. Connect ports 1 and 8 of the eight-way valve to enrich the organic matter in the extraction column onto the first enrichment column. The first conductivity detector detects the change in conductivity in the pretreatment unit in real time. At the same time, connect ports 3 and 4 of the eight-way valve to control the third delivery pump to use the first eluent to perform gradient elution of the inorganic salts on the second enrichment column. The eluted inorganic salts are then separated by the second analytical column so that the second conductivity detector can detect the chromatogram of the inorganic salts in the sample. Connect ports 7 and 8 of the eight-way valve to control the second delivery pump to perform gradient elution of the organic matter on the first enrichment column using the second eluent, so that the eluted inorganic salts are separated by the second analytical column, and the ultraviolet detector can detect the organic chromatogram of the sample to be tested.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the steps of the exhaust gas treatment liquid detection method according to any one of claims 1 to 4.

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