Method for detecting concentration of multiple gases in exhaust gas and gas filter system

Abstract

The application provides a method for detecting the concentration of multiple gases in exhaust gas and a gas filtering system, and relates to the technical field of gas detection. The method comprises the following steps: according to the characteristics of the target detection gas, setting the composition and concentration of the mixed gas, injecting the mixed gas into a filtering channel, and eliminating the light interference in the red light band to obtain first light. After obtaining a user detection instruction, an air inlet valve is opened, the exhaust gas enters a detection chamber, the exhaust gas entering the detection chamber is detected by using a gas automatic identification module, and the concentrations of multiple target detection gases are estimated. The target detection gas with the highest concentration is determined, the filter is adjusted to filter the first light, the second light is obtained, the second light passes through the exhaust gas, the third light is obtained, the concentration of the target detection gas is determined according to the third light and the second light, and the concentration is displayed on the screen in real time. In the complex exhaust gas environment, the influence of the interference gas is eliminated, and the target detection gas concentration is accurately detected.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gas detection, and particularly relates to a detection method for multiple gas concentrations in exhaust gas and a gas filtering system. BACKGROUND

[0002] Under the double carbon target, various environmental protection fields generally need to monitor related exhaust gas. Among them, the sewage treatment process is actually a carbon emission process, and the carbon emission of the sewage treatment industry accounts for about 1% of the total emission of the whole society, accounting for the largest proportion in the environmental protection industry. Carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O) are emitted during the sewage treatment process. Among them, carbon dioxide is mainly derived from the energy consumption process of sewage treatment facilities, and carbon dioxide produced by the degradation of water pollutants is identified as biogenic carbon emission; methane is mainly derived from the anaerobic link of sewage treatment, including pipe network, anaerobic tank, septic tank, sludge anaerobic digestion tank, etc.; nitrous oxide is mainly derived from the nitrification and denitrification stage of the sewage treatment process.

[0003] In the prior art, an NDIR infrared gas sensor is usually used to measure the target gas concentration of exhaust gas.

[0004] However, the conventional NDIR infrared gas sensor is interfered by CO2, and the exhaust gas without filtering treatment enters the detection area of the sensor, in which a large amount of infrared light is absorbed by high-concentration CO2 in its absorption band. These absorption bands may overlap with part of the absorption bands of N2O and CH4, thereby interfering with the measurement, so the prior art cannot accurately measure N2O and CH4. SUMMARY

[0005] The present application provides a detection method for multiple gas concentrations in exhaust gas and a gas filtering system, which are used to solve the problem of low detection precision caused by interference gas in the prior art during exhaust gas detection, and realize accurate detection of the target detection gas concentration in a complex exhaust gas environment.

[0006] In a first aspect, the application provides a method for detecting the concentration of multiple gases in exhaust gas, which is applied to a gas filtering system. The method comprises: determining the composition and concentration of a set mixed gas according to the characteristics of an interference gas to be eliminated and the detection requirements of a target detection gas, the set mixed gas being used to absorb the light interference intensity of the red light band of the target detection gas; controlling the injection of the set mixed gas into a light filtering channel, controlling a light source emitter to emit red light to the light filtering channel to obtain first light after the light interference intensity is eliminated; after receiving a target gas detection instruction sent by a user end, controlling the opening of an air inlet valve to allow the exhaust gas to enter the detection chamber; controlling a gas automatic identification module to identify the exhaust gas entering the detection chamber, the gas automatic identification module being used to detect gas characteristics and estimate the target gas concentration of the current multiple target detection gases; after determining the target detection gas with the highest target gas concentration, adjusting a light filter to filter the first light to obtain second light corresponding to the target detection gas; controlling the second light to pass through the exhaust gas to obtain third light; determining the gas concentration of the target detection gas according to the third light and the second light by a gas sensor, and transmitting the gas concentration to a display screen in real time for dynamic display.

[0007] By adopting the above technical solution, the set mixed gas is determined according to the characteristics of the interference gas to be eliminated and the requirements of the target detection gas, the first light is obtained by injecting the set mixed gas into the light filtering channel and emitting red light, and a series of subsequent operations can eliminate the light interference of the interference gas, accurately identify the target detection gas, adjust the light filter to obtain accurate light, and finally determine the gas concentration and display. The steps are closely coordinated to realize high-precision detection of the concentration of the target detection gas in a complex exhaust gas environment, and improve the detection accuracy.

[0008] In combination with some embodiments of the first aspect, in some embodiments, after the step of controlling the opening of the air inlet valve to allow the exhaust gas to enter the detection chamber after receiving the target gas detection instruction sent by the user end, the method further comprises: pre-processing the measurement environment in the detection chamber according to the standard measurement environment of the target detection gas, the pre-processing comprising adjusting the measurement temperature of the measurement environment to a standard detection temperature range by a gas temperature adjusting unit in the detection chamber, and adjusting the measurement pressure of the measurement environment to a standard pressure range by a pre-set air pressure stabilizer.

[0009] By adopting the above technical solution, the exhaust gas enters the detection chamber in an ideal measurement environment consistent with the standard measurement environment, avoiding the influence of environmental factors on the gas detection result, and ensuring the accuracy and reliability of the detection data.

[0010] In some embodiments of the first aspect, after the step of controlling the light source emitter to emit red light to the light filtering channel, and obtaining the first light intensity after eliminating the interference of the light, the method further comprises: obtaining a current mixed gas concentration by a gas concentration sensor inside the light filtering channel; comparing the current mixed gas concentration with a set mixed gas concentration threshold; and if the current mixed gas concentration is lower than the set mixed gas concentration threshold, sending an opening signal to the gas supplement device to make the gas supplement device start to deliver mixed gas according to a preset supplement flow strategy.

[0011] By using the above technical solution, the mixed gas concentration can be monitored in real time, and the deficiency can be supplemented in time, so that the mixed gas is always at a suitable concentration, thereby continuously and stably eliminating the interference of the interference gas light, maintaining the efficient operation of the detection system, and ensuring that the accuracy of the target detection gas detection is not affected by the fluctuation of the mixed gas concentration.

[0012] In some embodiments of the first aspect, after the step of sending an opening signal to the gas supplement device to make the gas supplement device start to deliver mixed gas according to a preset supplement flow strategy if the current mixed gas concentration is lower than the set mixed gas concentration threshold, the method further comprises: if it is detected that the current mixed gas concentration is greater than the set mixed gas concentration threshold, closing the delivery valve of the gas supplement device.

[0013] By using the above technical solution, the mixed gas concentration can be precisely controlled within a suitable range in cooperation with the previous step of supplementing mixed gas, avoiding waste of resources or adverse effects on the detection system caused by excessively high concentration, while preventing excessive supplement from affecting detection accuracy, and further optimizing the management of mixed gas.

[0014] In some embodiments of the first aspect, after the step of receiving a target gas detection instruction from the user end and controlling the intake valve to be opened to make the exhaust gas enter the detection chamber, the method further comprises: obtaining a current pressure value of the exhaust gas by a pressure sensor inside the detection chamber; and if the pressure value exceeds an alarm threshold, sending an overpressure reminder to the display.

[0015] By using the above technical solution, the gas pressure can be monitored in real time, and timely feedback can be provided when the pressure is abnormal, preventing damage to the detection equipment caused by excessively high pressure, ensuring the safe operation of the detection equipment, reminding the operator to handle the abnormal situation in time, maintaining the stability and reliability of the detection system, ensuring the smooth progress of the detection work, and reducing equipment failure and detection interruption caused by pressure problems.

[0016] In some embodiments of the first aspect, after the step of determining the gas concentration of the target detection gas by the gas sensor according to the third light and the second light and transmitting the gas concentration to the display screen for dynamic display, the method further comprises: constructing an error correction model according to the plurality of interference gas concentrations and measurement error data, the measurement error data being a difference between a measured concentration and an actual concentration of the target detection gas; obtaining the interference gas concentration by the gas automatic identification module; and calculating and correcting the gas concentration of the target detection gas in real time by the error correction model.

[0017] By using the above technical solution, the measurement error can be effectively compensated by combining with various data, thereby improving the detection accuracy. In particular, in the presence of interfering gases, the real concentration of the target detection gas can be more accurately reflected, and the reliability of the detection result is enhanced.

[0018] In some embodiments of the first aspect, after the step of determining the gas concentration of the target detection gas by the gas sensor according to the third light and the second light and transmitting the gas concentration to the display screen for dynamic display, the method further comprises: obtaining the identification data of the gas automatic identification module, and when a first target detection gas concentration is less than a set threshold and a second target detection gas concentration is greater than the set threshold, replacing the filter matched with the second target detection gas by the gas sensor.

[0019] By using the above technical solution, the filter is automatically adjusted according to the actual detection condition, the sensor is always matched with the current main target detection gas, the detection pertinence and accuracy are improved, the detection system can quickly adapt to different gas concentration changes, the detection method is optimized in time, the detection efficiency and accuracy are improved, and the detection requirements of various gases are better met.

[0020] In a second aspect, a server is provided, which comprises one or more processors and a memory. The memory is coupled to the one or more processors, and is configured to store computer program codes comprising computer instructions. The one or more processors invoke the computer instructions to enable the server to perform the method described in the first aspect and any possible implementation manner of the first aspect.

[0021] In a third aspect, a computer readable storage medium is provided, which comprises instructions. When the instructions are run on a server, the server is enabled to perform the method described in the first aspect and any possible implementation manner of the first aspect.

[0022] In a fourth aspect, a computer program product is provided. When the computer program product is run on a server, the server is enabled to perform the method described in the first aspect and any possible implementation manner of the first aspect.

[0023] The one or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0024] 1. Since the technical means of determining the set mixed gas based on the characteristics of the interference gas to be eliminated and the requirements of the target detection gas, and the multi-step cooperative light treatment and gas detection and concentration determination are adopted, the technical problem of large interference of the interference gas and low detection precision in the prior art during the detection of the exhaust gas is effectively solved, and the technical effect of high-precision detection of the target gas concentration in a complex exhaust gas environment is realized, and reliable data for gas monitoring is provided.

[0025] 2. Since the technical means of real-time monitoring of the mixed gas concentration after specific light treatment and supplementing as needed is adopted, the technical problem of unstable mixed gas concentration in the prior art affecting the interference elimination effect and detection accuracy is effectively solved, and the technical effect of continuously and stably eliminating interference and ensuring efficient and accurate operation of the detection system is realized.

[0026] 3. Since the technical means of constructing an error correction model and combining the data obtained by the gas automatic identification module to correct the concentration is adopted, the technical problem of large measurement error and inaccurate detection results caused by the interference gas in the prior art is effectively solved, and the technical effect of improving the detection precision and enhancing the credibility of the detection results to adapt to the complex gas environment is realized. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is an application structure schematic diagram of the detection method of the multi-gas concentration in the exhaust gas in the embodiments of the present application;

[0028] Figure 2 is a flowchart of the detection method of the multi-gas concentration in the exhaust gas in the embodiments of the present application;

[0029] Figure 3 is another flowchart of the detection method of the multi-gas concentration in the exhaust gas in the embodiments of the present application;

[0030] Figure 4 is a schematic diagram of an entity device structure of the gas filter system in the embodiments of the present application. DETAILED DESCRIPTION

[0031] The terminology used in the following description of the embodiments herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the description of the embodiments and the appended claims herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It also will be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0032] Hereinafter, the terms "first", "second", "third", "fourth", "fifth", "sixth", "seventh" and "eighth" are used only for the purpose of description, and should not be understood as implying relative importance or implying the number of the technical features indicated. Therefore, the features defined with "first", "second", "third", "fourth", "fifth", "sixth", "seventh" and "eighth" can explicitly or implicitly include one or more of the features, and in the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise specified.

[0033] First, the structure applied to the method provided by the present embodiment is described below. Please refer to

[0037] , which is a schematic diagram of an application structure of the detection method of the concentration of multiple gases in exhaust gas in the embodiments of the present application.

[0038] In , the leftmost side of the gas filter system includes a light source emitter for emitting red light band illumination, the filter channel is filled with a pre-set mixed gas, the red light band interference of the interfering gas (such as CO2) is absorbed by the mixed gas, after the illumination transmits through the mixed gas in the filter channel, the first illumination with the interference intensity of the illumination eliminated, the filter is located behind the filter channel, the filter can be adjusted according to the type of target detection gas, the second illumination is obtained when the first illumination transmits through the set filter, the third illumination is obtained when the second illumination transmits through the exhaust gas in the detection chamber, and the gas sensor determines the gas concentration of the target detection gas through the difference between the second illumination and the third illumination. This system eliminates the influence of interfering gases through double filtering (mixed gas filtering + filter), especially solves the interference problem of CO2 on the detection of other gases (such as N2O and CH4), and improves the detection accuracy.

[0039] For the sake of understanding, the method provided by the present embodiment is described below. Please refer to

[0040] , which is a flowchart of the detection method of the concentration of multiple gases in exhaust gas in the embodiments of the present application.

[0041] S201, according to the characteristics of the interfering gas to be eliminated and the detection requirements of the target detection gas, the composition and concentration of the set mixed gas are determined, which is used to absorb the red light band illumination interference intensity of the interfering gas to be eliminated in the target detection gas;

[0037] The main purpose of this step is to design a specific mixed gas to eliminate the influence of interfering gases (such as CO2) on the concentration measurement of target detection gases (such as CH4, N2O). This is because in infrared spectral analysis, the absorption spectra of different gases may overlap, leading to measurement errors. For common interfering gases, such as in sewage treatment emission gas detection, CO2 is the main interfering gas. It has a specific absorption spectrum in the infrared waveband, and its absorption band may partially overlap with the target detection gas (such as N2O and CH4). Through spectral analysis techniques, the absorption peak position and absorption intensity characteristics of CO2 in the red light waveband (e.g. a specific wavelength range) are accurately determined. This requires the use of high-precision spectrometers to detect pure CO2 gas samples and obtain their detailed spectral absorption curves.

[0038] Clearly define the target detection gas detection requirements: taking N2O and CH4 as examples, according to the standard requirements in environmental monitoring or industrial emission control, determine the required detection accuracy, detection lower limit (e.g. the minimum detectable concentration value), and response time (the time required from the gas entering the detection system to obtaining accurate concentration results). At the same time, considering the possible concentration range of these gases in actual emissions, determine the appropriate detection range. Based on the above analysis, select a gas that can effectively absorb the interference of CO2 in the red light waveband as a mixed gas component. For example, a certain rare gas or gas mixture with a specific concentration may be selected, whose molecular structure can produce complementary absorption effect in the interference waveband of CO2. Through a large number of experiments and theoretical calculations, the optimal proportion of each component is determined. For example, after multiple tests, it is found that when A gas accounts for X%, and B gas accounts for Y%, the interference absorption effect of CO2 in the specific red light waveband is best, thereby determining the specific components and concentrations of the mixed gas. In actual operation, a high-precision gas mixing device is used to accurately prepare the mixed gas according to the predetermined proportion. This device has flow control and real-time concentration monitoring functions, ensuring the accuracy and stability of the mixed gas.

[0039] In some embodiments, a real-time gas analysis module can be installed in the gas filtering system, which can continuously monitor the real-time changes in the concentration of interfering gases (such as CO2) in the exhaust gas. When there is a large fluctuation in the concentration of interfering gases (beyond the preset range), the composition and concentration of the set mixed gas are automatically adjusted according to the pre-established algorithm model, which is trained based on a large amount of experimental data and actual emission scene data. During the model training phase, data on the concentration changes of interfering gases in exhaust gases under different industry conditions and the corresponding optimal mixed gas composition and concentration adjustment strategies are collected. For example, the CO2 concentration range under different treatment stages, different seasons, and different water quality in sewage treatment plants, as well as the mixed gas composition and concentration combination that can effectively eliminate interference are recorded in detail. Machine learning algorithms are used to analyze and train these data to establish a mathematical relationship model between the concentration of interfering gases and the composition and concentration of mixed gases. In this way, if the CO2 concentration suddenly rises, the system automatically increases the proportion of gases with stronger CO2 absorption capacity and adjusts other components accordingly to ensure optimal interference elimination at all times. At the same time, this adjustment process seamlessly connects with the subsequent detection process without the need for human intervention, achieving adaptive response to different emission conditions.

[0040] S202, control the injection of the set mixed gas into the light filtering channel, control the light source emitter to emit red light to the light filtering channel, and obtain the first light with the light interference intensity eliminated;

[0041] In this step, the gas filtering system first needs to accurately control the process of injecting the set mixed gas into the light filtering channel. To achieve this goal, the system is equipped with a high-precision gas injection device connected to the gas source storing the set mixed gas, which is controlled by a pre-set program logic to ensure that the mixed gas enters the light filtering channel at a stable and uniform flow rate. In actual operation, the system will accurately inject the mixed gas by controlling the valve opening degree and injection time of the gas injection device according to the pre-calculated amount of mixed gas required. At the same time, in order to ensure that the mixed gas is evenly distributed in the light filtering channel, a special gas diffusion structure is designed inside the light filtering channel. This structure is composed of a series of carefully arranged guide plates and gas dispersers. When the mixed gas enters the light filtering channel, it will quickly and evenly fill the entire channel space under the action of these structures, thereby ensuring effective absorption of red light band interference. When the set mixed gas is stably distributed in the light filtering channel, the light source emitter starts to work. The light source emitter uses a high-stability red light emitting diode (LED) as the light source, with the emission wavelength precisely set near the red light band absorption peak of the interfering gas (such as CO2) in the target detection gas, usually a specific nanometer wavelength range.

[0042] The red light emitted by the light source emitter interacts with the mixed gas after entering the light filtering channel. The specific components in the mixed gas selectively absorb part of the red light band that overlaps with the interference gas absorption band, thereby reducing the light intensity of this band. After absorption by the mixed gas, the light output from the other end of the light filtering channel is the first light with reduced interference light intensity.

[0043] S203, after receiving the target gas detection instruction sent by the user end, the control opens the air inlet valve to make the exhaust gas enter the detection chamber;

[0044] When the user end sends the target gas detection instruction, the control unit of the gas light filtering system responds quickly. The air inlet valve adopts an electric control mode, and the valve motor is driven to work by the system sending instructions, so as to realize the accurate opening of the valve.

[0045] Before opening the air inlet valve, the detection chamber is purged with pure inert gas (such as nitrogen) by the gas purging device in the detection chamber to remove other gases that may be left in the detection chamber and avoid interference with subsequent exhaust gas detection. The purging process lasts for a period of time to ensure that the gas environment in the detection chamber reaches the initial clean state. Then, the system starts the gas temperature adjusting unit and the gas pressure stabilizer in the detection chamber. The gas temperature adjusting unit uses advanced thermoelectric refrigeration / heating technology to accurately adjust the temperature in the detection chamber by controlling the current direction and size of the thermoelectric module. When receiving the target gas detection instruction, the system quickly adjusts the temperature in the detection chamber to the standard measurement temperature range of the target detection gas. The gas pressure stabilizer monitors the gas pressure in the detection chamber in real time through the pressure sensor and compares it with the preset standard pressure range. If the gas pressure deviates from the standard range, the gas pressure stabilizer will automatically start the corresponding adjustment mechanism. After ensuring that the detection chamber environment is ready, the system controls the opening of the air inlet valve, and the exhaust gas starts to enter the detection chamber. The opening degree of the air inlet valve can be accurately controlled according to the expected flow rate of the exhaust gas and the detection requirements. During the process of the exhaust gas entering the detection chamber, the system continuously monitors various environmental parameters in the detection chamber, such as temperature, gas pressure and gas flow rate. If any parameter is found to be abnormal, the system will immediately take appropriate adjustment measures to ensure that the detection environment is always in the best state, providing reliable protection for subsequent gas detection.

[0046] In some embodiments, the pressure value of the current exhaust gas can also be obtained through the pressure sensor in the detection chamber. If the pressure value exceeds the alarm threshold, an overpressure reminder is sent to the display. Such pressure monitoring and overpressure reminder mechanism effectively prevents high pressure from damaging the detection equipment, ensures the safe operation of the detection equipment, and ensures the smooth progress of the detection work, reducing equipment failure and detection interruption caused by pressure problems.

[0047] S204, controlling the gas automatic identification module to identify the exhaust gas entering the detection chamber, the gas automatic identification module being used to detect gas characteristics and estimate the target gas concentration of the current multiple target detection gases;

[0048] The gas automatic identification module starts working immediately after the exhaust gas enters the detection chamber. The module integrates multiple advanced gas detection technologies, including but not limited to infrared spectroscopy technology, electrochemical sensor technology, and semiconductor gas sensor technology, to achieve accurate identification and concentration estimation of multiple target detection gases. When the exhaust gas enters the detection chamber, the infrared spectrometer emits infrared light covering the characteristic absorption wavelength range of the target detection gas, and detects the light intensity change after the light transmits through the gas. By comparing the light intensity difference of the incident light and the outgoing light at different wavelengths, and using the pre-established gas spectrum database for matching analysis, the possible types of target detection gases in the exhaust gas can be determined. For example, for carbon dioxide (CO2) detection, it has a strong absorption peak at a specific wavelength (such as 4.26 μm). When the infrared spectrometer detects a significant decrease in light intensity at this wavelength, it is preliminarily judged that the exhaust gas contains CO2. Then, according to the degree of light intensity decrease, combined with the Beer-Lambert law, the concentration of CO2 is estimated through a mathematical calculation model. After completing the detection and analysis of the exhaust gas, the gas automatic identification module transmits the detected target detection gas types and their estimated target gas concentration information to the system. These data will serve as an important basis for subsequent determination of the target detection gas with the highest target gas concentration and further accurate measurement of gas concentration.

[0049] S205, after determining the target detection gas with the highest target gas concentration, adjusting the filter to filter the first light to obtain the second light corresponding to the target detection gas;

[0050] After the gas automatic identification module completes the concentration estimation of multiple target detection gases in the exhaust gas, the gas filter system analyzes these data to determine the target detection gas with the highest target gas concentration. Once the target gas is determined, the system will automatically adjust the parameters of the filter according to the pre-set corresponding relationship. The adjustment of the filter is realized through a high-precision motor drive device, which can accurately control the angle and position of the filter to match the absorption spectrum characteristics of the target detection gas. For example, for different target detection gases such as methane and nitrous oxide, their absorption peak positions in the infrared band are different. The system will adjust the filter to the position that can maximize the transmission of the target gas characteristic wavelength according to the pre-stored database information. During the adjustment of the filter, the system will monitor the state of the filter in real time to ensure its accurate positioning. This is realized through the position sensor installed near the filter, which feeds back the actual position information of the filter to the system. The system compares and adjusts according to the pre-set target position to ensure that the adjustment accuracy of the filter is within a very small error range.

[0051] When the filter adjustment is completed, the first light transmits through the adjusted filter and, through the selective transmission of the filter, obtains a second light that is adapted to the absorption characteristics of the target detection gas. The spectral characteristics of the second light will be more conducive to the subsequent accurate measurement of the concentration of the target detection gas

[0052] S206, control the second light to pass through the exhaust gas to obtain a third light;

[0053] After obtaining the second light corresponding to the target detection gas, the gas filter system controls the light path system to make the second light pass vertically through the exhaust gas in the detection chamber. The light path inside the detection chamber is carefully optimized and uses high-quality optical lenses and mirrors to ensure that the second light maintains stable propagation direction and intensity when passing through the exhaust gas, reducing the loss and scattering of light during transmission.

[0054] During the transmission of the light through the exhaust gas, the target detection gas molecules in the exhaust gas will absorb light of a specific wavelength, causing changes in the intensity and spectral characteristics of the second light. After the second light passes through the exhaust gas, the system uses a high-precision light detector to receive the light that passes out of the exhaust gas. This light is the third light.

[0055] S207, determining the gas concentration of the target detection gas according to the third light and the second light through the gas sensor, and transmitting the gas concentration to the display screen for dynamic display in real time.

[0056] Upon receiving the relevant information of the third light and the second light (usually in the form of electrical signals), the gas sensor analyzes these signals using advanced signal processing algorithms. First, the signals are denoised and amplified to improve the quality and resolution of the signals. By using a high-precision analog-to-digital converter, the analog electrical signals are converted into digital signals, facilitating subsequent accurate calculations. Then, according to the Lambert-Beer law, the gas sensor calculates the concentration of the target detection gas by comparing the intensity changes of the third light and the second light. This law describes the quantitative relationship between light absorption and substance concentration. In this system, by combining the pre-calibrated calibration curve and the known optical path length (i.e., the distance that the second light passes through the exhaust gas, which has been accurately determined in the system design), and combining the real-time measured light intensity changes, the accurate concentration of the target detection gas is calculated.

[0057] After calculating the concentration of the target detection gas, the gas sensor transmits the concentration data to the system, which further processes and verifies the data to ensure its accuracy and reliability. For example, by comparing with historical data, checking the rationality range of the data, etc., the influence of abnormal data is excluded. The verified gas concentration data is transmitted to the display screen in real time for dynamic display. The display screen uses high-resolution liquid crystal display (LCD) or organic light-emitting diode display (OLED) technology, which can clearly and intuitively display the concentration changes of the target detection gas. The display interface is simple and clear, and can also display other related information such as measurement time, detection environment parameters, etc., to facilitate users to understand the detection situation at any time. The system also has data storage function, which stores the concentration data and related measurement parameters of each measurement in the internal memory or external storage device, so as to facilitate subsequent data analysis and processing.

[0058] In some embodiments, the gas automatic identification module generates detailed identification data after detecting the exhaust gas entering the detection chamber. These data include the results of feature analysis of multiple target detection gases and the estimated concentration values. When the concentration of the first target detection gas is less than the set threshold value and the concentration of the second target detection gas is greater than the set threshold value, it means that the concentration distribution of the gas components in the exhaust gas has changed, and the filter of the gas sensor needs to be adjusted to adapt to the new main target detection gas (i.e. the second target detection gas). The set threshold value is pre-set according to the specific detection requirements and the characteristics of the target detection gas. Once it is determined that the filter needs to be replaced, the system sends a control signal to the gas sensor to start the filter replacement program. The gas sensor is equipped with a precise filter switching device, which is usually driven by a motor and can accurately control the position switching of the filter. The system determines the position number or characteristic parameters of the filter matched with the second target detection gas according to the pre-stored database information. Then, the motor of the filter switching device is instructed to control the motor to rotate, driving the mechanical structure such as the filter support or turntable to replace the current filter with the filter matched with the second target detection gas. When the filter replacement is completed, the gas sensor will use the new filter to detect the exhaust gas. The new filter can better transmit the characteristic wavelength of the second target detection gas, improving the accuracy of its concentration measurement.

[0059] In the embodiments of the present application, by determining the set mixed gas components and concentrations based on the characteristics of the interference gas to be eliminated and the requirements of the target detection gas, and combining a series of collaborative operations such as injecting mixed gas to eliminate light interference, accurately controlling the detection environment, intelligently identifying and adjusting the detection gas related parameters, high-precision detection and accurate display of the concentration of the target detection gas in a complex exhaust gas environment are realized, effectively solving the problems of large interference of interference gas and low detection precision in the prior art.

[0060] In some embodiments, a large amount of experimental data needs to be collected to determine the concentration of multiple interference gases and the measurement error data of the corresponding target detection gas. During the experiment, various interference gases (such as CO2 commonly used in sewage treatment exhaust gas detection) and target detection gases (such as CH4, N2O, etc.) with known concentrations are mixed in different proportions to form a series of standard gas samples. Then, these samples are introduced into the gas filter system for detection to obtain the measured concentration of the target detection gas.

[0061] By comparing with the actual concentration of the target detection gas in the standard gas sample, the measurement error (the difference between the measured concentration and the actual concentration) is calculated. At the same time, the gas automatic identification module accurately obtains the concentration of the interfering gas in the sample. These interfering gas concentration data and corresponding measurement error data are used as training data to construct an error correction model using a suitable machine learning algorithm. After the exhaust gas enters the detection chamber, the gas automatic identification module continuously detects the gas. It uses integrated multiple advanced gas detection technologies to identify interfering gases and estimate their concentrations. During actual detection, when the gas automatic identification module obtains the concentration of interfering gases in the current exhaust gas, these data are input into the error correction model that has been constructed. The model calculates the corresponding measurement error correction value according to the input interfering gas concentration data based on the pre-established mathematical relationship. Then, the correction value is applied to the measured concentration of the target detection gas obtained by the gas sensor. The system will update and display the corrected concentration of the target detection gas in real time to ensure that users can obtain more accurate detection results. At the same time, the system will continuously monitor the changes in the concentration of interfering gases and repeatedly perform the above process to dynamically correct the concentration of the target detection gas to adapt to the real-time changes in the composition and concentration of the exhaust gas, effectively improving the detection accuracy, especially in complex environments with multiple interfering gases, to more accurately reflect the true concentration of the target detection gas.

[0062] After combining the above content, the following further more specific flow description of the method provided by the present embodiment is provided. Please refer to Figure 3 , another flowchart of the method for detecting the concentration of multiple gases in the exhaust gas in the embodiment of the present application.

[0063] S301, obtain the current mixed gas concentration through the gas concentration sensor inside the light filtering channel;

[0064] A high-precision gas concentration sensor is installed inside the light filtering channel in the gas light filtering system, which can measure the concentration of the mixed gas in the light filtering channel in real time and accurately. When the system is in operation, the gas concentration sensor works continuously, and its probe part is in full contact with the mixed gas to measure the gas concentration of the mixed gas.

[0065] S302, determine whether the current mixed gas concentration is lower than the set mixed gas concentration threshold;

[0066] After obtaining the current mixed gas concentration, the gas light filtering system compares the concentration value with the preset set mixed gas concentration threshold. The set mixed gas concentration threshold is determined according to the requirements of the system for the elimination effect of interfering gases and experimental verification, to ensure that the mixed gas can effectively absorb the light interference intensity of the interfering gas (such as CO2) in the red light band within the concentration range.

[0067] When the current mixed gas concentration is lower than the set mixed gas concentration threshold, the system determines that the mixed gas needs to be replenished to maintain its effective absorption capacity for the interference gas, and then step S303 is performed;

[0068] If the current mixed gas concentration is equal to or higher than the set threshold, the system considers that the current mixed gas concentration is in the appropriate range, and no replenishment operation is needed, and then step S304 is performed.

[0069] S303, send an opening signal to the gas replenishment device to make the gas replenishment device start delivering mixed gas according to the preset replenishment flow strategy;

[0070] When the gas filter system determines that the current mixed gas concentration is lower than the set threshold, an opening signal is immediately sent to the gas replenishment device. The gas replenishment device is a precise gas delivery system, mainly composed of a gas storage source, a pressure regulating device, a flow control valve, a gas delivery pipeline, and related sensors and controllers. The gas storage source is used to store the pre-prepared set mixed gas, and the flow control valve is the key component of the gas replenishment device, which is responsible for accurately controlling the delivery flow of the mixed gas. The valve adopts a high-precision electric flow regulating valve. The preset replenishment flow strategy is based on the response requirements of the system to the change of the mixed gas concentration and the performance parameters of the gas replenishment device, for example, the system uses a proportional-integral-derivative (PID) control algorithm, calculates the target opening value of the flow control valve according to the difference between the current mixed gas concentration and the set threshold, and adjusts the opening of the flow control valve in real time during the gas replenishment process according to the instructions of the gas filter system, so that the replenishment flow can quickly and accurately raise the mixed gas concentration to the appropriate range. In order to ensure the accuracy of the replenishment flow, the gas replenishment device is also equipped with a flow monitoring sensor, which is installed on the gas delivery pipeline and can monitor the actual gas delivery flow in real time, and feedback the flow data to the system in the form of an electric signal. The system further adjusts the flow control valve according to the feedback information to form a closed-loop control system, ensuring that the replenishment flow always meets the preset strategy and realizes accurate control of the mixed gas concentration.

[0071] S304, close the delivery valve of the gas replenishment device.

[0072] In the process of the gas supplementing device delivering the mixed gas according to the preset strategy, the gas concentration sensor inside the light filtering channel of the gas light filtering system continuously monitors the mixed gas concentration. When the system detects that the current mixed gas concentration reaches or exceeds the set mixed gas concentration threshold, a closing signal is immediately sent to the delivery valve of the gas supplementing device. After the valve is closed, the system again confirms the mixed gas concentration through the gas concentration sensor inside the light filtering channel. If it is detected that the mixed gas concentration is still within the set threshold range and is stable for a period of time (for example, several minutes), the system determines that the mixed gas supplementing operation has been successfully completed, at which time the system enters a normal detection standby state, waiting for the next detection instruction or continuing the subsequent detection process (such as the detection operation after the exhaust gas enters the detection chamber).

[0073] By using the gas concentration monitoring and supplementing control method in the embodiments of the present application, through real-time monitoring, accurate judgment and intelligent supplementing control of the mixed gas concentration in the light filtering channel, accurate management of the mixed gas concentration is realized, which not only effectively ensures that the mixed gas is always in a suitable concentration range that can efficiently eliminate the light interference of the interference gas, but also greatly improves the stability and reliability of the entire detection system, ensures the accuracy and continuity of the concentration detection of the target detection gas in a complex exhaust gas environment, and reduces the detection errors caused by fluctuations or insufficient mixed gas concentration.

[0074] The gas light filtering system in the embodiments of the present application will be described from the perspective of hardware processing. Please refer to Figure 4 , which is a schematic diagram of an entity device structure of the gas light filtering system in the embodiments of the present application.

[0075] It should be noted that, Figure 4 The structure of the gas light filtering system shown is only an example and should not impose any limitation on the functions and use range of the embodiments of the present application.

[0076] As Figure 4 shown, the gas light filtering system includes a central processing unit (CPU) 401, which can perform various appropriate actions and processes according to programs stored in a read-only memory (ROM) 402 or loaded from a storage portion 408 to a random access memory (RAM) 403, such as performing the methods described in the above embodiments. In the RAM 403, various programs and data required for system operation are also stored. The system 401, the ROM 402, and the RAM 403 are connected to each other through a bus 404. An input / output (I / O) interface 405 is also connected to the bus 404.

[0077] The following components are connected to the I / O interface 405: an input section 406 including an audio input device, a push button switch, and the like; an output section 407 including a Liquid Crystal Display (LCD), and an audio output device, a lamp, and the like; a storage section 408 including a hard disk and the like; and a communication section 409 including a network interface card such as a LAN (Local Area Network) card, a modem, and the like. The communication section 409 performs a communication process via a network such as the Internet. A drive 410 is also connected to the I / O interface 405 as necessary. A removable recording medium 411, such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, and the like, is attached to the drive 410 as necessary so that a computer program read therefrom is installed into the storage section 408 as necessary.

[0078] In particular, the processes described above with reference to the flow charts can be implemented as computer software programs in accordance with embodiments of the present application. For example, embodiments of the present application include a computer program product comprising a computer program carried on a computer readable medium, the computer program containing computer programs for executing the methods shown in the flow charts. In such embodiments, the computer program can be downloaded and installed from a network via the communication section 409, and / or installed from the removable recording medium 411. When the computer program is executed by the central processing unit (system) 401, various functions defined in the present application are performed.

[0079] It should be noted that specific examples of computer readable storage media can include without limitation: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM), a flash memory, an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the present application, a computer readable storage medium can be any tangible medium that can contain or store a program for use by or in connection with an instruction execution system, apparatus, or device.

[0080] The flow diagrams and the block diagrams in the drawings are schematic and specific embodiments of possible architectures, functions, and operations of systems, methods and computer program products according to various embodiments of present application. It will be appreciated that each block in the flow diagrams and the block diagrams, and combinations of blocks in the flow diagrams and the block diagrams, can be implemented by various means, such as hardware, software, firmware, or any combination thereof. Also, the disclosure can be implemented by one or more computer program products, i.e., one or more modules of computer program instructions encoded on a computer readable medium for execution by, or to control the operation of, the gas filter system, or to implement various aspects and embodiments of the present application. Thus, the computer program instructions can be used to implement a method, or to cause the functioning of any electronic device or system having the instructions embodied therein. In this regard, the computer program instructions can be used to implement a method, or to cause the functioning of any electronic device or system having the instructions embodied therein.

[0081] Specifically, the gas filter system in the embodiment includes a processor and a memory, and the memory stores a computer program. When the computer program is executed by the processor, the detection method of the concentration of multiple gases in exhaust gas provided in the above embodiment is implemented.

[0082] As another aspect, the present application also provides a computer readable storage medium. The storage medium can be included in the gas filter system described in the above embodiments, or can exist independently without being assembled into the gas filter system. The storage medium carries one or more computer programs. When the one or more computer programs are executed by a processor of the gas filter system, the gas filter system implements the detection method of the concentration of multiple gases in exhaust gas provided in the above embodiments.

[0083] The above embodiments are only used to illustrate the technical solutions of the present application, but not limit the present application; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

[0084] In the above embodiments, according to the context, the term "when" can be interpreted as meaning "if" or "after" or "in response to determining" or "in response to detecting". Similarly, according to the context, the phrase "on determining" or "if detecting (the stated condition or event)" can be interpreted as meaning "if determining" or "in response to determining" or "on detecting (the stated condition or event)" or "in response to detecting (the stated condition or event)".

[0085] Those skilled in the art can understand that all or part of the processes in the above-mentioned method embodiments can be implemented by a computer program instructing relevant hardware to complete, the program can be stored in a computer readable storage medium, and the program can include the processes of the above-mentioned method embodiments when executed. The aforementioned storage medium includes ROM or random storage memory RAM, magnetic disc or optical disc and various storage code medium.

Claims

1. A method for detecting the concentration of multiple gases in exhaust gas, applied to a gas filtering system, characterized in that: The method comprises: Determine the composition and concentration of a set mixed gas according to the characteristics of the interfering gas to be eliminated and the detection requirements of the target detection gas, wherein the set mixed gas is used to absorb the light interference intensity of the red light band of the interfering gas to be eliminated in the target detection gas; Controlling the injection of the set mixed gas into the filter channel, controlling the light source emitter to emit red light into the filter channel, and obtaining a first light after eliminating the light interference intensity; After receiving the target gas detection instruction from the user end, the control opens the air inlet valve to allow the exhaust gas to enter the detection chamber; Controlling the gas automatic identification module to identify the exhaust gas entering the detection chamber, the gas automatic identification module is used to detect gas characteristics and estimate the target gas concentration of the current plurality of target detection gases; After determining the target detection gas with the highest target gas concentration, adjusting the filter to filter the first light to obtain a second light corresponding to the target detection gas; controlling the second illumination to pass through the exhaust gas to obtain a third illumination; The gas concentration of the target detection gas is determined by a gas sensor according to the third illumination and the second illumination, and the gas concentration is transmitted to a display screen in real time for dynamic display.

2. The method according to claim 1, characterized in that After receiving the target gas detection instruction sent by the user end, the method further includes: The measurement environment in the detection chamber is preprocessed according to the standard measurement environment of the target detection gas. The preprocessing includes adjusting the measurement temperature of the measurement environment to the standard detection temperature range through the gas temperature adjustment unit in the detection chamber, and adjusting the measurement pressure of the measurement environment to the standard pressure range through a pre-set air pressure stabilizer.

3. The method according to claim 1, characterized in that After the steps of controlling the injection of the set mixed gas into the filter channel, controlling the light source emitter to emit red light into the filter channel, and obtaining the first light after eliminating the light interference intensity, the method further includes: Obtaining the current mixed gas concentration through the gas concentration sensor inside the filter channel; Comparing the current mixed gas concentration with a set mixed gas concentration threshold; If the current mixed gas concentration is lower than the set mixed gas concentration threshold, an opening signal is sent to the gas replenishment device, so that the gas replenishment device starts to deliver the mixed gas according to the preset replenishment flow strategy.

4. The method according to claim 3, characterized in that If the current mixed gas concentration is lower than the set mixed gas concentration threshold, after the step of sending an opening signal to the gas replenishing device so that the gas replenishing device starts delivering the mixed gas according to a preset replenishing flow rate strategy, the method further includes: If it is detected that the current mixed gas concentration is greater than the set mixed gas concentration threshold, the delivery valve of the gas replenishing device is closed.

5. The method according to claim 1, wherein After receiving the target gas detection instruction sent by the user end, the method further includes: obtaining the current pressure value of the exhaust gas through the pressure sensor in the detection chamber; If the pressure value exceeds the alarm threshold, an overpressure warning is issued to the display.

6. The method according to claim 1, characterized in that After the step of determining the gas concentration of the target detection gas according to the third illumination and the second illumination by a gas sensor, and transmitting the gas concentration to a display screen in real time for dynamic display, the method further includes: Constructing an error correction model based on multiple interfering gas concentrations and measurement error data, wherein the measurement error data refers to the difference between the measured concentration and the actual concentration of the target detection gas; Acquiring the interfering gas concentration through the gas automatic identification module; The gas concentration of the target detection gas is calculated and corrected in real time through the error correction model.

7. The method according to claim 1, characterized in that After the step of determining the gas concentration of the target detection gas according to the third illumination and the second illumination by a gas sensor, and transmitting the gas concentration to a display screen in real time for dynamic display, the method further includes: The identification data of the gas automatic identification module is obtained. When it is identified that the concentration of the first target detection gas is less than the set threshold and the concentration of the second target detection gas is greater than the set threshold, the gas sensor is controlled to replace the filter that matches the second target gas to be detected.

8. A server, characterized in that: The server includes: one or more processors and a memory; the memory is coupled to the one or more processors, the memory is used to store computer program code, the computer program code includes computer instructions, and the one or more processors call the computer instructions to cause the server to execute the method according to any one of claims 1 to 7.

9. A computer-readable storage medium comprising instructions, characterized in that: When the instructions are executed on a server, the server is caused to execute the method according to any one of claims 1 to 7.

10. A computer program product, characterized in that When the computer program product is run on a server, the server is caused to perform the method according to any one of claims 1 to 7.

Images