Nitrogen oxide online analysis monitoring method, system and equipment and computer readable storage medium

Abstract

The invention discloses a nitrogen oxide online analysis monitoring method, system and equipment and a storage medium. The method comprises the following steps: continuously sampling mixed gas containing nitrogen oxide, pre-processing to remove interference components, introducing into a reaction device to react with a preset reactant, optically detecting a product to obtain a signal, processing to obtain concentration data, and transmitting, storing and displaying the concentration data. The system comprises a sampling module, a preprocessing module, a reaction module, a detection module, a processing module and a transmission storage module. The equipment comprises a processor, a memory and related programs, and the storage medium stores the corresponding programs. The device can realize real-time accurate monitoring of nitrogen oxides, and is suitable for the field of environmental monitoring.

Description

Technical Field

[0001] This invention relates to the field of control systems, and more specifically, to a method, system, device, and computer-readable storage medium for online analysis and monitoring of nitrogen oxides. Background Technology

[0002] Nitrogen oxides are major air pollutants, posing significant threats to the environment and human health, necessitating real-time and effective monitoring. Existing monitoring methods suffer from inadequate pretreatment, low reaction efficiency, and poor detection accuracy. Some methods fail to effectively remove interfering components, affecting results; poorly controlled reaction conditions lead to incomplete reactions; and outdated optical signal processing technology results in significant noise interference. Furthermore, existing systems exhibit poor module coordination and insufficient equipment stability, making it difficult to meet the real-time and accuracy requirements of online monitoring. Therefore, improvements to monitoring methods and systems are necessary. Summary of the Invention

[0003] The purpose of this application is to provide an online analysis and monitoring method, system, device, and computer-readable storage medium for nitrogen oxides, in order to solve the problems of insufficient pretreatment, low reaction efficiency, poor detection accuracy, poor system module coordination and equipment stability in existing nitrogen oxide monitoring methods, which make it difficult to meet the requirements of real-time and accuracy for online monitoring.

[0004] In a first aspect, the present invention provides an online analysis and monitoring method for nitrogen oxides, comprising the following steps: continuously sampling the gas in the area to be monitored to obtain a mixed gas containing nitrogen oxides; pre-treating the mixed gas to remove interfering components; introducing the pre-treated gas into a reaction device to allow the nitrogen oxides in the gas to react chemically with a preset reactant; optically detecting the products after the reaction to obtain corresponding optical signals; processing the optical signals to obtain detection data related to the nitrogen oxide concentration; and transmitting the detection data to a data storage unit for storage and simultaneously sending it to a display unit for display.

[0005] Furthermore, the step of pretreating the mixed gas includes: filtering the mixed gas to remove particulate matter; drying the filtered gas to reduce the moisture content; and adjusting the pressure of the dried gas to bring the gas pressure within a preset range.

[0006] Furthermore, the step of causing the nitrogen oxides in the gas to react chemically with the preset reactants includes: introducing the pretreated gas and the preset reactants into the reaction chamber of the reaction device in a preset ratio; controlling the temperature in the reaction chamber within a preset range and maintaining the reaction process for a preset duration; and stirring the reaction chamber during the reaction process to promote full contact between the gas and the reactants.

[0007] Furthermore, the step of processing the optical signal includes: performing noise reduction processing on the acquired optical signal to remove background interference signals; performing feature extraction on the noise-reduced optical signal to obtain feature parameters corresponding to the nitrogen oxide concentration; and comparing the feature parameters with preset calibration parameters to obtain the nitrogen oxide concentration detection value.

[0008] Secondly, the present invention also provides an online analysis and monitoring system for nitrogen oxides, characterized in that it includes a sampling module for continuously collecting gas samples from the area to be monitored to obtain a mixed gas containing nitrogen oxides; a pretreatment module for processing the mixed gas to remove interfering components; a reaction module for causing the nitrogen oxides in the pretreated gas to react chemically with preset reactants; a detection module for optically detecting the reaction products to obtain corresponding optical signals; a processing module for processing the optical signals to obtain detection data related to nitrogen oxide concentration; and a transmission and storage module for transmitting and storing the detection data to a storage unit and simultaneously sending it to a display unit for display.

[0009] Furthermore, the pretreatment module includes a filtration submodule for filtering the mixed gas to remove particulate matter; a drying submodule for drying the filtered gas to reduce its moisture content; and a pressure regulating submodule for regulating the pressure of the dried gas to keep it within a preset range.

[0010] Furthermore, the reaction module includes a proportioning control submodule, which is used to introduce the pretreated gas and preset reactants into the reaction chamber according to a preset ratio; a temperature control submodule, which is used to control the temperature in the reaction chamber within a preset range and maintain the reaction process for a preset duration; and a stirring submodule, which is used to stir the reaction chamber during the reaction process to promote full contact between the gas and the reactants.

[0011] Furthermore, the processing module includes a noise reduction submodule, which is used to perform noise reduction processing on the acquired optical signal to remove background interference signals; a feature extraction submodule, which is used to extract features from the noise-reduced optical signal to obtain feature parameters corresponding to the nitrogen oxide concentration; and a comparison submodule, which is used to compare the feature parameters with preset calibration parameters to obtain the nitrogen oxide concentration detection value.

[0012] Thirdly, the present invention also provides an online nitrogen oxide analysis and monitoring device, including a processor, a memory, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of any of the online nitrogen oxide analysis and monitoring methods described above.

[0013] Fourthly, the present invention also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the online nitrogen oxide analysis and monitoring method described in any one of the claims.

[0014] Beneficial effects

[0015] This invention enables real-time online monitoring of nitrogen oxides, improving detection accuracy and reliability. The pretreatment step effectively removes interference from particulate matter and moisture, ensuring stable subsequent reactions and detection. The reaction apparatus precisely controls the proportions, temperature, and stirring, improving reaction efficiency and completeness. Optical detection combined with advanced signal processing reduces noise interference and improves concentration calculation accuracy. System modules work collaboratively to ensure a smooth and efficient process. The equipment and storage media ensure stable operation and secure data storage and transmission, providing reliable data support for environmental monitoring and industrial production, with broad application prospects. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, 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 the structures shown in these drawings without creative effort.

[0017] Figure 1 The working steps of the online nitrogen oxide analysis and monitoring method provided in this embodiment are shown in the diagram.

[0018] Figure 2 A schematic diagram of an online nitrogen oxide analysis and monitoring system module provided in another embodiment of the present invention;

[0019] Figure 3 A schematic diagram of an online nitrogen oxide analysis and monitoring device provided in another embodiment of the present invention. Figure 1 ;

[0020] Figure 4 A schematic diagram of an online nitrogen oxide analysis and monitoring device provided in another embodiment of the present invention. Figure 2 . Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0022] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0023] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text implies three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied. Furthermore, the technical solutions of the various embodiments can be combined, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0024] This invention discloses an online analysis and monitoring method, system, device, and storage medium for nitrogen oxides, aiming to achieve real-time and accurate monitoring of nitrogen oxides and provide reliable data support for environmental monitoring, industrial production, and other fields. The following sections will describe each part in detail.

[0025] For an online analysis and monitoring method for nitrogen oxides, the overall process revolves around gas collection, processing, reaction, detection, data processing, transmission and storage, with each step closely linked to form a complete monitoring closed loop.

[0026] In the step of continuously sampling gases in the area to be monitored to obtain nitrogen oxide-containing gas mixtures, the selection of sampling locations is crucial. The monitoring area needs to be determined based on the monitoring objective. For example, near industrial plants, locations representative of the dispersion range of emissions should be selected; in urban environmental monitoring, sampling locations should be distributed across different functional zones, such as industrial areas, residential areas, and commercial areas. Sampling devices typically employ pump-suction sampling. The selection of the sampling pump must consider the stability and continuity of the sampling flow rate to ensure the representativeness of the collected gas. The material of the sampling tube also has strict requirements; it must be a material that does not readily react with nitrogen oxides and has low adsorption capacity to avoid affecting the gas composition during sampling. Simultaneously, to ensure continuous sampling, the sampling system should have a stable power supply and automatic fault recovery function, enabling it to resume normal sampling quickly in the event of a brief failure, avoiding data loss.

[0027] Pre-treating the mixed gas to remove interfering components is a crucial step in ensuring the accuracy of subsequent detection. The first step is filtration to remove particulate matter. The presence of particulate matter can not only clog subsequent reaction devices and detection instruments but also interfere with chemical reactions and optical detection. Filtration devices typically employ a multi-stage filtration structure. Primary filtration removes larger particles, such as those larger than 10 micrometers in diameter, while secondary filtration further removes smaller particles, such as those smaller than 2.5 micrometers in diameter. Filter materials such as glass fiber membranes and polytetrafluoroethylene (PTFE) membranes can be used, as these materials offer good filtration efficiency and chemical stability. During the filtration process, the filtration device needs to be inspected and replaced regularly to prevent a decrease in filtration efficiency.

[0028] The filtered gas undergoes drying to reduce its moisture content. Moisture affects the efficiency of the chemical reaction between nitrogen oxides and pre-set reactants, and also interferes with optical detection, such as forming fog in the optical detection cell, affecting light propagation and signal acquisition. Drying can be achieved using adsorption methods, with commonly used desiccants including silica gel and molecular sieves. Silica gel desiccants have strong water absorption capacity and change color after absorbing water, making it easy to determine their effectiveness; molecular sieves have a uniform pore structure, enabling selective adsorption of moisture and resulting in high drying efficiency. The drying device design should ensure sufficient contact between the gas and the desiccant to achieve good drying results. Simultaneously, to avoid the desiccant adsorbing nitrogen oxides from the gas, a desiccant with low nitrogen oxide adsorption capacity should be selected.

[0029] The dried gas undergoes pressure regulation to maintain its pressure within a preset range. Instability in gas pressure affects the gas flow rate and reaction time within the reaction apparatus, thus impacting the accuracy of the detection results. The pressure regulation device typically includes a pressure sensor and a regulating valve. The pressure sensor monitors the gas pressure in real time and transmits the signal to the control system. The control system then controls the opening of the regulating valve according to the preset pressure range, thereby achieving stable gas pressure regulation. During pressure regulation, it is crucial to ensure a moderate adjustment rate to avoid excessive pressure fluctuations that could affect subsequent steps.

[0030] In the step of introducing the pretreated gas into the reaction apparatus to allow the nitrogen oxides in the gas to react chemically with the pre-selected reactants, the structural design of the reaction apparatus directly affects the reaction efficiency. The reaction apparatus typically employs a sealed reaction chamber equipped with a stirring device and a temperature control device. The pretreated gas and the pre-selected reactants are introduced into the reaction chamber according to a preset ratio. This ratio is controlled by a flow controller, which precisely regulates the flow rates of the gas and reactants to ensure they are mixed in the set proportions. The selection of the pre-selected reactants depends on the type of nitrogen oxides and the detection method. For example, for monitoring nitric oxide and nitrogen dioxide, specific chemical reagents can be selected to induce a colorimetric reaction with the nitrogen oxides or generate specific products.

[0031] The temperature within the reaction chamber is controlled within a preset range, maintaining the reaction process for a preset duration. Temperature significantly affects the rate and extent of chemical reactions; different chemical reactions require specific temperature conditions to achieve optimal results. The temperature control device can employ electric heating or water bath heating. A temperature sensor monitors the temperature within the reaction chamber in real time and feeds the signal back to the temperature control system. The control system maintains a stable reaction temperature by adjusting the heating power. The reaction duration must be determined based on the kinetic characteristics of the chemical reaction to ensure that the reaction proceeds fully.

[0032] During the reaction, the reaction chamber is stirred to promote sufficient contact between the gas and the reactants. The stirring device can be magnetic or mechanical, and the stirring speed should be moderate to ensure thorough mixing of the gas and reactants while avoiding problems such as solution splashing or excessive bubble generation due to excessive stirring speed. The stirring time should be matched with the reaction duration, from the moment the gas and reactants enter the reaction chamber until the end of the reaction, ensuring sufficient contact between the two throughout the entire reaction process.

[0033] Optical detection of the reaction products to obtain the corresponding optical signals is the core step in detecting nitrogen oxide concentration. Optical detection devices typically include a light source, an optical detection cell, and a photodetector. The selection of the light source must be determined based on the optical characteristics of the reaction products. For example, if the reaction products have an absorption peak at a specific wavelength, a monochromatic light source of that wavelength is selected; if the reaction products emit fluorescence, a suitable excitation light source is selected. The optical detection cell is the site for optical detection of the reaction products; its material should have good light transmittance and be resistant to reaction with the reaction products. The photodetector is used to convert the optical signal into an electrical signal. Common photodetectors include photodiodes and photomultiplier tubes, and their performance directly affects the sensitivity and accuracy of the detection signal. During optical detection, it is necessary to ensure the stability of the light source and the cleanliness of the optical detection cell to avoid affecting the quality of the detection signal due to fluctuations in the light source or contamination of the detection cell.

[0034] Processing optical signals to obtain detection data related to nitrogen oxide concentration requires a series of signal processing steps. First, the acquired optical signals undergo noise reduction to remove background interference. Optical signals are subject to various interferences during acquisition, such as ambient light and electronic noise. Noise reduction can employ digital filtering techniques, such as low-pass filtering and wavelet transform filtering. These methods effectively remove high-frequency and random noise while retaining useful signal components.

[0035] Feature extraction is performed on the denoised optical signal to obtain characteristic parameters corresponding to the nitrogen oxide concentration. The selection of characteristic parameters needs to be determined based on the principle of optical detection. For example, in absorption spectroscopy, the characteristic parameter can be the absorbance at a specific wavelength; in fluorescence spectroscopy, the characteristic parameter can be the fluorescence intensity. The feature extraction process typically includes steps such as baseline correction and peak detection to accurately obtain the characteristic parameters.

[0036] The concentration of nitrogen oxides is obtained by comparing the characteristic parameters with preset calibration parameters. The calibration parameters are predetermined by detecting standard nitrogen oxides of known concentrations, establishing a calibration curve between the characteristic parameters and the concentration. In actual testing, the extracted characteristic parameters are substituted into the calibration curve to calculate the nitrogen oxide concentration. To ensure accuracy, the calibration curve needs to be calibrated periodically to avoid errors caused by instrument drift and other factors.

[0037] In the step of transmitting the detected data to the data storage unit for storage and simultaneously sending it to the display unit for display, data transmission can be performed via wired or wireless methods. Wired transmission typically uses communication protocols such as Ethernet and RS485, which are characterized by stable transmission and strong anti-interference capabilities; wireless transmission can use technologies such as GPRS and LoRa, suitable for monitoring scenarios where wiring is inconvenient. The data storage unit can use storage media such as hard drives or memory cards, and the storage capacity should be designed according to the monitoring frequency and monitoring cycle to ensure that it can store detection data for a sufficiently long period of time. The display unit can be a display screen to display information such as the nitrogen oxide concentration detection value and detection time in real time, allowing operators to monitor the monitoring situation in real time. At the same time, the display unit can also have data query and trend analysis functions to facilitate data analysis.

[0038] For the further defined steps of pretreating the mixed gas in the method according to claim 1, the three sub-steps of filtration, drying, and pressure regulation are performed sequentially, forming a coherent pretreatment process. The filtration sub-step provides a clean gaseous environment for subsequent drying and pressure regulation, preventing particulate matter from damaging the desiccant and pressure regulating device; the drying sub-step removes moisture from the gas, creating suitable conditions for pressure regulation and subsequent chemical reactions; the pressure regulation sub-step ensures stable gas flow in the reaction device, ensuring the smooth progress of the reaction. These three sub-steps work together to improve the pretreatment effect and ensure the accuracy of the entire monitoring method.

[0039] When filtering mixed gases, in addition to selecting appropriate filter materials and multi-stage filtration structures, the maintenance cycle of the filter device must also be considered. A maintenance cycle that is too short will increase operating costs, while a cycle that is too long may lead to a decrease in filtration efficiency. The maintenance cycle can be reasonably set based on the concentration of particulate matter in the monitored environment, and the need for replacement can be determined by monitoring the differential pressure of the filter device online. When the differential pressure exceeds a preset value, it indicates that the filter device is clogged and needs to be replaced promptly.

[0040] In drying processes, the regeneration and replacement of desiccants are crucial considerations. For regenerable desiccants, such as silica gel, they can be regenerated by heating after their water absorption capacity is lost, allowing for reuse and reducing costs. The regeneration process must be carried out in a specialized regeneration unit to ensure effectiveness. For non-regenerable desiccants, such as certain molecular sieves, periodic replacement is necessary. The replacement cycle depends on the desiccant's water absorption capacity and the moisture content of the gas.

[0041] During pressure regulation, the preset pressure range needs to be set according to the requirements of the reaction apparatus and the performance of the subsequent detection instruments. Different reaction apparatuses and detection instruments have different requirements for gas pressure; excessively high or low pressure will affect their normal operation. When setting the pressure range, multiple tests are required to determine the optimal pressure range to ensure the accuracy and stability of the detection results.

[0042] In the step of introducing the pretreated gas and pre-set reactants into the reaction chamber of the reaction apparatus according to a predetermined ratio, the determination of the predetermined ratio needs to be based on the stoichiometric relationships of the chemical reaction and experimental data. The optimal ratio is selected by experimentally studying the degree of reaction completion and product stability under different ratios. The accuracy and stability of the flow controller are crucial; a high-precision mass flow controller should be selected to ensure that the flow control error of the gas and reactants is within the allowable range. At the same time, the flow controller needs to be calibrated regularly to ensure its control accuracy.

[0043] To maintain the temperature within a preset range and for a preset duration during the reaction process, the temperature value and duration of the preset range need to be determined through extensive experiments. In the experiments, under different temperature and reaction duration conditions, a standard gas of known concentrations of nitrogen oxides is detected. The amount of reaction products generated and the intensity of the detection signal are analyzed to determine the optimal temperature range and reaction duration. The accuracy of the temperature control device should meet the reaction requirements; typically, temperature fluctuations should be controlled within a small range, such as ±0.5℃.

[0044] When stirring the reaction chamber during the reaction process, the stirring speed must be selected based on a comprehensive consideration of the characteristics of the reaction system. For reaction systems with high viscosity, a higher stirring speed is required; while for reaction systems prone to foaming, the stirring speed should be appropriately reduced. The installation position of the stirring device should be reasonable to ensure uniform stirring and avoid incomplete local reactions.

[0045] In the process of processing optical signals, the choice of noise reduction method should be determined based on the characteristics of the noise. If the noise is mainly high-frequency, low-pass filtering can be used; if the noise is random, wavelet transform filtering will be more effective. During the noise reduction process, it is necessary to avoid excessive noise reduction that could lead to the loss of useful signals; therefore, appropriate noise reduction parameters need to be determined experimentally.

[0046] During feature extraction, baseline correction aims to eliminate the influence of background signals, ensuring that feature parameters accurately reflect the amount of reaction products. Baseline correction can employ methods such as polynomial fitting and rolling averaging, with the appropriate correction method selected based on the baseline drift of the optical signal. Peak detection requires accurate identification of the position and intensity of characteristic peaks, which can be achieved using thresholding methods, derivative methods, etc., to ensure the accuracy of feature parameter extraction.

[0047] When comparing the characteristic parameters with preset calibration parameters to obtain the nitrogen oxide concentration detection value, the establishment of calibration parameters requires the use of a series of nitrogen oxide standard gases with different concentrations. Multiple measurements are performed at different concentrations to obtain the corresponding characteristic parameters. A calibration curve between the characteristic parameters and the concentration is then fitted using methods such as the least squares method. The correlation coefficient of the calibration curve should reach a high level, such as R² ≥ 0.999, to ensure the accuracy of the detection results. Simultaneously, the applicable range of the calibration curve should cover the range of nitrogen oxide concentrations that may be encountered in actual monitoring.

[0048] refer to Figure 2 This invention also provides an online nitrogen oxide analysis and monitoring system, which consists of multiple modules working collaboratively to complete the online analysis and monitoring of nitrogen oxides. The sampling module, as the system's input, directly affects the overall monitoring effect. The sampling module typically includes components such as a sampling pump, a sampling tube, and a flow controller. The sampling pump provides the sampling power, the sampling tube introduces the gas to be monitored into the system, and the flow controller controls the sampling flow rate. To adapt to different monitoring environments, the sampling module should possess certain protective capabilities, such as dustproof, waterproof, and corrosion-resistant properties, to ensure normal operation in harsh environments. Simultaneously, the sampling module can also be equipped with a heating device to prevent moisture in the gas from condensing at low temperatures, which would affect the sampling effect.

[0049] The pretreatment module is connected to the sampling module, receiving and processing the mixed gas from it. The pretreatment module's filtration, drying, and pressure regulation submodules are connected sequentially to form a continuous processing line. The filtration accuracy of the filtration submodule should be determined according to the monitoring requirements; higher accuracy is needed for high-precision monitoring. The desiccant filling amount of the drying submodule should be determined based on the gas flow rate and moisture content to ensure sufficient drying time and effectiveness. The adjustment range of the pressure regulation submodule should match the requirements of the subsequent reaction module to ensure that the pressure-regulated gas meets the operating conditions of the reaction module.

[0050] The reaction module is the core component of the system for realizing chemical reactions, and its structural design and performance significantly impact reaction efficiency and detection results. The reaction chamber of the reaction module should have excellent sealing to prevent gas leakage from affecting the reaction and detection. The proportional control submodule achieves the preset mixing ratio by controlling the flow rates of gases and reactants; its control accuracy should meet the reaction requirements. The temperature control submodule employs a closed-loop control method, using a temperature sensor to provide real-time feedback on the temperature within the reaction chamber and promptly adjusting the heating power to ensure the temperature remains stable within the preset range. The stirring submodule's stirring speed can be adjusted according to reaction requirements to adapt to different reaction systems.

[0051] The detection module is used for optical detection of the reaction products, and its performance determines the system's detection sensitivity and accuracy. The light source of the detection module should have stable output power and wavelength characteristics; laser sources, xenon lamps, etc., can be selected. The optical path design of the optical detection cell should ensure that light can fully penetrate the reaction products, improving the intensity of the detection signal. The photodetector should have high response speed and sensitivity, capable of accurately capturing weak optical signals. To reduce interference from ambient light, the optical system of the detection module should be light-shielded to ensure the stability of the detection environment.

[0052] The processing module receives optical signals from the detection module and processes them. The processing module typically employs a microprocessor or embedded system, possessing strong data processing capabilities and high computing speed. The noise reduction submodule, feature extraction submodule, and comparison submodule are integrated into the processing module as software programs, implementing their respective functions through algorithms. The processing module may also have a data caching function to temporarily store intermediate data during processing for subsequent analysis and traceability.

[0053] The transmission and storage module is responsible for transmitting and storing the processed test data. This module can use wired or wireless communication to enable data interaction with external devices. The storage unit can be a large-capacity hard drive or flash memory, supporting long-term data storage. The transmission and storage module should also have data encryption capabilities to ensure data security during transmission and storage, preventing data tampering or leakage. Simultaneously, the transmission and storage module can be configured with data backup functionality to periodically back up stored data, avoiding data loss due to storage media failure. Further limitations are placed on the pre-processing modules in the system: the filtration submodule, drying submodule, and pressure regulation submodule each have specific functions and structures. The filter membrane of the filtration submodule should be easy and quick to replace, and can be designed with a drawer-type structure for easy maintenance by operators. The drying submodule can be equipped with a humidity sensor to monitor the humidity of the dried gas in real time; when the humidity exceeds a preset value, an alarm signal is issued to prompt replacement of the desiccant. The regulating valve of the pressure regulation submodule should have good linearity and repeatability to ensure the accuracy and stability of pressure regulation.

[0054] The proportional control submodule, temperature control submodule, and stirring submodule of the reaction module work together to ensure the smooth progress of the chemical reaction. The proportional control submodule works in conjunction with a flow sensor to monitor the flow rate of gas and reactants in real time and adjust it according to the set ratio. The heating elements of the temperature control submodule should be evenly distributed on the outer wall of the reaction chamber to ensure uniform temperature within the chamber. The stirring submodule's impeller design should be reasonable to produce good stirring effect while avoiding wear on the inner wall of the reaction chamber.

[0055] The noise reduction, feature extraction, and comparison submodules of the processing module employ advanced algorithms to improve the accuracy and speed of data processing. The noise reduction submodule algorithm can be optimized according to the actual noise conditions; for example, an adaptive filtering algorithm can automatically adapt to different noise environments. The feature extraction submodule algorithm should have strong anti-interference capabilities and be able to accurately extract feature parameters. The comparison submodule algorithm should have fast computation capabilities, enabling it to complete the comparison between feature parameters and calibration parameters in a short time to obtain the nitrogen oxide concentration detection value.

[0056] refer to Figures 3-4 Thirdly, the present invention also provides an online nitrogen oxide analysis and monitoring device, including a processor, a memory, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the online nitrogen oxide analysis and monitoring method as described in any one of the claims.

[0057] An online nitrogen oxide analysis and monitoring device includes a processor, a memory, and a computer program stored in the memory and executable on the processor. The processor, as the core of the device, is responsible for controlling the operation and data processing of the entire device. The processor's performance should meet the device's real-time requirements, possessing high computing speed and processing power. The memory is used to store computer programs, detection data, calibration parameters, and other information, including random access memory (RAM) and read-only memory (ROM). RAM is used for temporary storage of data during operation, while ROM is used to store the device's startup program and basic configuration information.

[0058] The equipment's hardware structure also includes input / output interfaces for connecting external devices, such as sampling devices, preprocessing devices, reaction devices, detection devices, and display devices. These input / output interfaces can adopt various standard interfaces, such as USB, RS232, and Ethernet, to improve the equipment's compatibility and scalability. The equipment should also be equipped with a power module to provide a stable power supply for the entire device. The power module can support both AC and DC power inputs to adapt to different usage scenarios.

[0059] When the processor executes the computer program, it implements the steps of the online analysis and monitoring method for nitrogen oxides. The computer program adopts a modular design, encapsulating functions such as sampling control, pretreatment control, reaction control, detection control, data processing, and data transmission and storage into different modules. These modules interact with each other through interfaces. The program also includes a fault diagnosis and handling module, which can monitor the operating status of various parts of the equipment in real time. When a fault occurs, it promptly issues an alarm signal and takes corresponding measures, such as automatic shutdown or switching to backup equipment.

[0060] A computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps of an online nitrogen oxide analysis and monitoring method. The computer-readable storage medium can be various types of storage media, such as hard disks and floppy disks.

[0061] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A method for online analysis and monitoring of nitrogen oxides, characterized in that, Includes the following steps: Continuous sampling of the gas in the area to be monitored is performed to obtain a mixed gas containing nitrogen oxides; The mixed gas is pretreated to remove interfering components; The pretreated gas is introduced into the reaction device, so that the nitrogen oxides in the gas react chemically with the preset reactants; The products after the reaction are subjected to optical detection to obtain the corresponding optical signals; the optical signals are processed to obtain detection data related to the concentration of nitrogen oxides. The detected data is transmitted to the data storage unit for storage and simultaneously sent to the display unit for display.

2. The method according to claim 1, characterized in that, The steps for pretreating the mixed gas include: filtering the mixed gas to remove particulate matter; drying the filtered gas to reduce its moisture content; and adjusting the pressure of the dried gas to bring it within a preset range.

3. The method according to claim 1, characterized in that, The steps for causing nitrogen oxides in the gas to react chemically with preset reactants include: introducing the pretreated gas and preset reactants into the reaction chamber of the reaction device in a preset ratio; controlling the temperature in the reaction chamber within a preset range and maintaining the reaction process for a preset duration; and stirring the reaction chamber during the reaction process to promote full contact between the gas and the reactants.

4. The method according to claim 1, characterized in that, The steps for processing the optical signal include: denoising the acquired optical signal to remove background interference signals; extracting features from the denoised optical signal to obtain feature parameters corresponding to the nitrogen oxide concentration; and comparing the feature parameters with preset calibration parameters to obtain the nitrogen oxide concentration detection value.

5. An online analysis and monitoring system for nitrogen oxides, characterized in that, It includes a sampling module, a preprocessing module, a reaction module, a monitoring module, a processing module, and a transmission and storage module. The sampling module is used to continuously collect gas samples from the area to be monitored, obtaining mixed gases containing nitrogen oxides; A pretreatment module is used to process the mixed gas to remove interfering components; The reaction module is used to chemically react nitrogen oxides in the pretreated gas with preset reactants. The detection module is used to perform optical detection on the products of the chemical reaction between nitrogen oxides and preset reactants in the pretreated gas, and to obtain the corresponding optical signals. The processing module is used to process the optical signal to obtain detection data related to the nitrogen oxide concentration; The transmission and storage module is used to transmit the detection data to the storage unit for storage and simultaneously send it to the display unit for display.

6. The system according to claim 5, characterized in that, The pretreatment module includes a filtration submodule for filtering the mixed gas to remove particulate matter; a drying submodule for drying the filtered gas to reduce its moisture content; and a pressure regulating submodule for regulating the pressure of the dried gas to keep it within a preset range.

7. The system according to claim 5, characterized in that, The reaction module includes a proportioning control submodule, which is used to introduce pretreated gas and preset reactants into the reaction chamber according to a preset ratio; a temperature control submodule, which is used to control the temperature in the reaction chamber within a preset range and maintain the reaction process for a preset duration; and a stirring submodule, which is used to stir the reaction chamber during the reaction process to promote full contact between the gas and the reactants.

8. The system according to claim 5, characterized in that, The processing module includes a noise reduction submodule, which is used to reduce the noise of the acquired optical signal and remove background interference signals; a feature extraction submodule, which is used to extract features from the noise-reduced optical signal to obtain feature parameters corresponding to the nitrogen oxide concentration; and a comparison submodule, which is used to compare the feature parameters with preset calibration parameters to obtain the nitrogen oxide concentration detection value.

9. An online nitrogen oxide analysis and monitoring device, characterized in that, It includes a processor, a memory, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the online nitrogen oxide analysis and monitoring method as described in any one of claims 1 to 4.

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 online nitrogen oxide analysis and monitoring method as described in any one of claims 1 to 4.

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