Organic amine on-line monitoring system

Abstract

The invention provides an organic amine on-line monitoring system, which relates to the technical field of environmental monitoring, and comprises an acquisition assembly, an absorption liquid supply assembly, an absorption liquid sample preparation assembly, an ion chromatography analysis module and a data acquisition and control module, the collection assembly comprises a sampling gun provided with a heating device, a collection pipeline, an impact sampling structure and a cooling structure, the impact sampling structure can be used for performing multi-stage collection operation on organic ammonia in flue gas, and the absorption liquid supply assembly is used for conveying absorption liquid into the impact sampling structure; the ion chromatographic analysis module is used for detecting the absorption liquid sample; and the data acquisition and control module is used for realizing linkage control and data storage. According to the invention, different forms of organic amines and main degradation products thereof can be captured to the greatest extent, the influence of temperature rise and fluctuation on sample components is reduced, and the detection precision of organic amine escape and main degradation products of the carbon capture device is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of environmental monitoring, and in particular to an organic amine online monitoring system. Background Art

[0002] Carbon dioxide (CO2) capture, utilization and storage (CCUS) refers to the process of separating CO2 from flue gases in energy utilization, industrial production processes, or from the atmosphere, and achieving its emission reduction through engineering means. CCUS is currently the only technical option for achieving low-carbon utilization of fossil energy, an important technical means for achieving large-scale CO2 emission reduction, and an indispensable component of the technology portfolio for achieving carbon neutrality goals. Among the many CO2 capture technologies: chemical absorption technology using organic amines as absorbents has the characteristics of high absorption efficiency, good adaptability, and mature process. It is the carbon capture technology with the greatest industrial application potential at this stage. The basic principle of organic amine chemical absorption CO2 capture technology is to utilize the reversible reaction between amine liquid and CO2 in flue gas in the absorption tower, that is, the absorbent undergoes a CO2 absorption reaction at a relatively low temperature (about 40°C), and the reaction product undergoes a CO2 desorption reaction at a high temperature (about 120°C) in the desorption tower, thereby separating CO2 from the flue gas. During the organic amine CO2 capture process, the organic amine absorbent and its degradation products are discharged with the flue gas through the top of the absorption tower, causing operational losses of the absorbent and secondary environmental pollution. Emissions of organic amines occur in three forms: gaseous emissions due to volatilization, droplet entrainment, and aerosol emissions.

[0003] Conducting monitoring of the escape of organic amines and their main degradation products helps to understand their escape levels, assess absorbent losses and environmental health risks caused by escape, and then take appropriate control measures to reduce their escape concentrations. Due to the high water content in flue gas, the amount of organic amines and degradation products emitted is large, the concentration is low, and they are emitted in multiple forms such as gas, droplets, and aerosols. Therefore, accurately monitoring the escaped organic amines is a challenging task. Currently, the methods for monitoring the escape of organic amines from CO2 capture are mainly divided into online monitoring and offline monitoring. The offline method takes samples on-site and absorbs the liquid, followed by laboratory analysis. The monitoring method is simple and has high detection accuracy; however, the operation is cumbersome, time-consuming, and labor-intensive. It cannot provide real-time amine emission information and cannot capture the high variability of amine emissions. Online monitoring mainly includes Fourier transform infrared spectrometry (FTIR), proton transfer reaction mass spectrometry (PTR-TOF-MS), etc., which can provide real-time amine emission information.

[0004] Fourier transform infrared spectrometers (FTIR) are currently widely used to monitor organic amine escape from CO2 capture. However, this method can only detect organic amines at the ppm level and is not suitable for applications with low amine escape. Due to the high water content in the flue gas at the absorber outlet, organic amines exist in the form of droplets and aerosols in addition to gaseous forms. To prevent water condensation in the sampling line and analysis unit, the FTIR sampling line and gas analysis cell are typically heated to 180°C. At this temperature, water vapor evaporates, and organic amines in the form of droplets and aerosols also evaporate. FTIR can be considered to measure the total organic amine concentration (including gaseous, droplet, and aerosol organic amines). However, interference from water vapor leads to a relatively high detection limit for FTIR. Furthermore, during the sampling and analysis process, elevated temperatures can cause oxidative and thermal degradation of organic amines, leading to measurement errors. Furthermore, FTIR is relatively expensive. Proton transfer reaction mass spectrometry (PTR-TOF-MS) can detect amines at the ppb level, but requires dedicated personnel for instrument operation and data analysis, is expensive, and has only been used in a small number of research-based monitoring of organic amine escape from CO2 capture. In addition, PTR-ToF-MS generally uses pipelines heated to 100°C. At this temperature, water vapor and droplets evaporate, but organic amines in aerosol form do not completely evaporate. PTR-ToF-MS can be considered to measure the concentration of organic amines in gaseous and droplet states, but not in aerosol state. Moreover, at this heating temperature, organic amines may undergo oxidative degradation, leading to measurement errors.

[0005] In summary, the existing online monitoring technology for organic amine escape has problems such as high detection limit, large measurement error, and high cost. Therefore, how to improve the detection accuracy of organic amine escape and main degradation products of carbon capture devices has become a technical problem that needs to be solved urgently. Summary of the Invention

[0006] In order to overcome the above-mentioned defects of the prior art, the technical problem to be solved by the embodiments of the present invention is to provide an online monitoring system for organic amines, which improves the detection accuracy of organic amine escape and main degradation products of carbon capture devices.

[0007] The above-mentioned object of the present invention can be achieved by adopting the following technical solutions. The present invention provides an organic amine online monitoring system, comprising:

[0008] A collection assembly, the collection assembly comprising a sampling gun provided with a heating device, a collection pipeline connected to the sampling gun, an impact sampling structure provided on the collection pipeline, and a cooling structure, the impact sampling structure being capable of performing a multi-stage collection operation of organic ammonia in the flue gas, and the cooling structure being used to cool the impact sampling structure;

[0009] an absorption liquid supply assembly, the absorption liquid supply assembly being connected to the impact sampling structure and being used to deliver the absorption liquid to the impact sampling structure;

[0010] An absorption liquid sample preparation assembly, the absorption liquid sample preparation assembly comprising a sample preparation pipeline for communicating with the impact sampling structure, an absorption liquid sample storage container disposed on the sample preparation pipeline, and a sample processing structure disposed on the sample preparation pipeline and downstream of the absorption liquid sample storage container, the sample processing structure being used to perform defoaming and / or filtering treatment on the absorption liquid sample;

[0011] an ion chromatography analysis module, the ion chromatography analysis module being connected to the sample preparation pipeline and being used to detect the absorption liquid sample transported by the sample preparation pipeline;

[0012] A data acquisition and control module is electrically connected to the acquisition component, the absorption liquid supply component, the absorption liquid sample preparation component and the ion chromatography analysis module. The data acquisition and control module is used to realize the linkage control and data storage of the acquisition component, the absorption liquid supply component, the absorption liquid sample preparation component and the ion chromatography analysis module.

[0013] In a preferred embodiment of the present invention, the impact sampling structure includes a first impact bottle and a second impact bottle arranged in series, and the collection pipeline includes a first collection pipe segment, a second collection pipe segment and a third collection pipe segment. The inlet of the first collection pipe segment is connected to the sampling gun, and the outlet of the first collection pipe segment extends into the first impact bottle. The first collection pipe segment is provided with a first collection control valve, the inlet of the second collection pipe segment is connected to the upper part of the first impact bottle, the outlet of the second collection pipe segment extends into the second impact bottle, and the third collection pipe segment is connected to the upper part of the second impact bottle.

[0014] In a preferred embodiment of the present invention, a first impact collection plate is provided in the first impact bottle, a first nozzle is provided at the outlet of the first collection pipe section, and the first nozzle is arranged toward the first impact collection plate; and / or a second impact collection plate is provided in the second impact bottle, a second nozzle is provided at the outlet of the second collection pipe section, and the second nozzle is arranged toward the second impact collection plate.

[0015] In a preferred embodiment of the present invention, the collection component further includes an air extraction device disposed at the outlet of the third collection pipe section.

[0016] In a preferred embodiment of the present invention, the collection assembly further includes a drying structure and an air filtering structure, which are sequentially arranged on the third collection pipe section along the direction from the secondary impact bottle to the air extraction device.

[0017] In a preferred embodiment of the present invention, the drying structure includes a first dryer and a second dryer arranged in parallel on the third collection pipe section, and a first collection control valve group arranged on the third collection pipe section, and the first collection control valve group is used to control the on and off status of the first dryer and the second dryer.

[0018] In a preferred embodiment of the present invention, the first collection control valve group includes a first collection three-way valve arranged upstream of the drying structure and connected to the first dryer and the second dryer respectively, a second collection control valve arranged downstream of the first dryer, and a third collection control valve arranged downstream of the second dryer, and the second collection control valve and the third collection control valve are arranged in parallel.

[0019] In a preferred embodiment of the present invention, the air filtration structure includes a first air filter and a second air filter arranged in parallel on the third collection pipe section, and a second collection control valve group arranged on the third collection pipe section, and the second collection control valve group is used to control the on and off status of the first air filter and the second air filter.

[0020] In a preferred embodiment of the present invention, the second collection control valve group includes a second collection three-way valve arranged upstream of the air filtration structure and connected to the first air filter and the second air filter respectively, a fourth collection control valve arranged downstream of the first air filter, and a fifth collection control valve arranged downstream of the second air filter, and the fourth collection control valve and the fifth collection control valve are arranged in parallel.

[0021] In a preferred embodiment of the present invention, the collection component further includes a mass flow meter, which is arranged on the third collection pipe section between the air filtering structure and the air extraction device.

[0022] In a preferred embodiment of the present invention, the organic amine online monitoring system also includes a compressed air purge structure, which includes a purge pipeline, and a pressure reducing valve, a pressure gauge and a purge three-way valve arranged on the purge pipeline in sequence along the air inlet direction. The inlet of the purge pipeline is connected to the first collection pipe section located between the first collection control valve and the first-level impact bottle through the purge three-way valve.

[0023] In a preferred embodiment of the present invention, the cooling structure includes a cooling water tank and a chiller connected to the cooling water tank, and the first-stage impact bottle and the second-stage impact bottle are arranged side by side in the cooling water tank.

[0024] In a preferred embodiment of the present invention, the absorption liquid supply assembly includes a first absorption liquid supply structure for connecting to the primary impact bottle, and a second absorption liquid supply structure for connecting to the secondary impact bottle. The first absorption liquid supply structure is used to transport the absorption liquid to the primary impact bottle, and the second absorption liquid supply structure is used to transport the absorption liquid to the secondary impact bottle.

[0025] In a preferred embodiment of the present invention, the first absorption liquid supply structure includes a first absorption liquid bottle, a first absorption liquid pipeline for connecting the first absorption liquid bottle and the first impact bottle, and a first peristaltic pump and a first absorption liquid control valve sequentially arranged on the first absorption liquid pipeline along the direction from the first absorption liquid bottle to the first impact bottle; and / or, the second absorption liquid supply structure includes a second absorption liquid bottle, a second absorption liquid pipeline for connecting the second absorption liquid bottle and the second impact bottle, and a second peristaltic pump and a second absorption liquid control valve sequentially arranged on the second absorption liquid pipeline along the direction from the second absorption liquid bottle to the second impact bottle.

[0026] In a preferred embodiment of the present invention, the inlet of the sample preparation pipeline is connected to the first-level impactor bottle and the second-level impactor bottle respectively, and the outlet of the sample preparation pipeline is connected to the ion chromatography analysis module. A sample preparation control valve group is provided on the sample preparation pipeline, and the sample preparation control valve group is used to control the on-off state of the sample preparation pipeline.

[0027] In a preferred embodiment of the present invention, the sample preparation control valve group includes a first sample control valve arranged downstream of the first impact bottle, a second sample control valve arranged downstream of the second impact bottle, and a third sample control valve arranged between the absorption liquid sample storage container and the sample processing structure.

[0028] In a preferred embodiment of the present invention, the sample processing structure includes a debubbler and a sample filter sequentially arranged on the sample preparation pipeline along the conveying direction of the sample preparation pipeline.

[0029] In a preferred embodiment of the present invention, the absorption liquid sample preparation component further includes an external discharge pipeline, which is connected to the sample preparation pipeline located between the absorption liquid sample storage container and the third sample control valve, and an external discharge control valve is provided on the external discharge pipeline.

[0030] In a preferred embodiment of the present invention, the absorption liquid sample preparation component further includes a liquid level sensor disposed in the absorption liquid sample storage container.

[0031] In a preferred embodiment of the present invention, the heating temperature range of the heating device is 50°C ± 5°C.

[0032] The technical solution of the present invention has the following significant beneficial effects:

[0033] The organic amine online monitoring system of the present invention can achieve comprehensive detection of gaseous, droplet and aerosol organic amines and their main degradation products through multi-stage collection, reliable absorption liquid supply, precise sample processing and preparation, high-precision ion chromatography analysis and intelligent data collection and control. Its detection limit can reach 0.1ppm, realizing efficient, non-destructive capture and precise detection of organic amine escape and main degradation product emissions in carbon capture devices, improving detection accuracy, and thus better meeting the monitoring requirements for organic amine escape and main degradation product emissions from carbon capture devices.

[0034] Specifically, the present invention can collect the flue gas to be tested in the flue through a sampling gun, and by controlling the heating temperature of the heating device on the sampling gun, for example, controlling the heating temperature to about 50°C, thereby avoiding oxidative degradation and thermal degradation of organic amines caused by high temperature, which helps to reduce measurement errors.

[0035] The impact sampling structure enables multi-stage collection of organic amines in flue gas, maximizing the capture of organic amines and their primary degradation products in various forms (e.g., gaseous, liquid, and aerosol), ensuring comprehensive collection. Furthermore, the cooling structure cools the impact sampling structure, further improving collection efficiency and reducing the impact of temperature rise and fluctuations on sample composition.

[0036] The absorption liquid supply component can transport the absorption liquid to the impact sampling structure to ensure the orderly supply of the absorption liquid during the sampling process. The absorption liquid can efficiently absorb the gaseous organic amines and their main degradation products in the airflow, thereby improving the collection effect of organic amines and their degradation products, and helping to improve the accuracy of the test results.

[0037] The sample processing structure in the absorption liquid sample preparation component can be used to defoam and / or filter the absorption liquid sample, thereby effectively removing bubbles and insoluble impurities in the absorption liquid sample, thereby improving the quality of the sample, providing a purer sample for subsequent ion chromatography analysis, and helping to enhance the reliability of the analysis results.

[0038] The ion chromatography analysis module can be used to analyze the prepared absorption liquid sample. It has a high detection accuracy of 0.1 ppm, meeting the emission monitoring requirements for organic amines and their main degradation products. Compared with other analytical methods, ion chromatography technology also has advantages in cost and maintenance, making it suitable for long-term, stable online operation.

[0039] In addition, the data acquisition and control module realizes the linkage control and data storage among all components, which helps to make the system operation more automated and intelligent. Users can use the data acquisition and control module to monitor the working status of each component and the collected data in real time, and obtain the test results in a timely manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0041] The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the various components in the drawings are merely illustrative and are used to help understand the present invention, and are not intended to specifically limit the shapes and proportional dimensions of the various components of the present invention. Those skilled in the art can select various possible shapes and proportional dimensions to implement the present invention according to specific circumstances under the guidance of the present invention.

[0042] Figure 1 This is a structural schematic diagram of an embodiment of the organic amine online monitoring system of the present invention;

[0043] Figure 2 This is a structural schematic diagram of an embodiment of the first nozzle and the first impact collection plate of the present invention.

[0044] Reference numerals in the above drawings:

[0045] 10. Flue;

[0046] 100, collection assembly; 110, sampling gun; 111, heating device; 120, collection pipeline; 121, first collection pipe section; 122, second collection pipe section; 123, third collection pipe section; 124, first nozzle; 1241, contraction section; 1242, straight section; 125, second nozzle; 126, exhaust device; 127, support member; 130, impact sampling structure; 131, first impact bottle; 132, second impact bottle; 133, first impact collection plate; 134, second impact collection Plate; 140, cooling structure; 141, cooling water tank; 142, chiller; 150, drying structure; 151, first dryer; 152, second dryer; 153, first collection three-way valve; 154, second collection control valve; 155, third collection control valve; 160, air filtration structure; 161, first air filter; 162, second air filter; 163, second collection three-way valve; 164, fourth collection control valve; 165, fifth collection control valve; 170, mass flow meter;

[0047] 200, absorption liquid supply assembly; 210, first absorption liquid supply structure; 211, first absorption liquid bottle; 212, first absorption liquid pipeline; 213, first peristaltic pump; 214, first absorption liquid control valve; 220, second absorption liquid supply structure; 221, second absorption liquid bottle; 222, second absorption liquid pipeline; 223, second peristaltic pump; 224, second absorption liquid control valve;

[0048] 300, absorption liquid sample preparation assembly; 310, sample preparation pipeline; 311, first sample control valve; 312, second sample control valve; 313, third sample control valve; 320, absorption liquid sample storage container; 321, liquid level sensor; 330, sample processing structure; 331, debubbler; 332, sample filter; 340, exhaust pipeline; 341, exhaust control valve;

[0049] 400, ion chromatography analysis module;

[0050] 500, compressed air purge structure; 510, purge pipeline; 511, pressure reducing valve; 512, pressure gauge; 513, purge three-way valve;

[0051] 600. Data acquisition and control module. DETAILED DESCRIPTION

[0052] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0053] Implementation Method 1

[0054] Please refer to Figure 1 As shown, an embodiment of the present invention provides an organic amine online monitoring system, which includes a collection component 100, an absorption liquid supply component 200, an absorption liquid sample preparation component 300, an ion chromatography analysis module 400 and a data acquisition and control module 600. The collection component 100 includes a sampling gun 110 provided with a heating device 111, a collection pipeline 120 connected to the sampling gun 110, an impact sampling structure 130 provided on the collection pipeline 120, and a cooling structure 140. The impact sampling structure 130 can be used for multi-stage collection of organic ammonia in flue gas, and the cooling structure 140 is used to cool the impact sampling structure 130; the absorption liquid supply component 200 is connected to the impact sampling structure 130, and the absorption liquid supply component 200 is used to transport the absorption liquid to the impact sampling structure 130; the absorption liquid sample preparation component 300 includes a component for connecting to the impact sampling structure 130, a sample preparation pipeline 310, an absorption liquid sample storage container 320 arranged on the sample preparation pipeline 310, and a sample processing structure 330 arranged on the sample preparation pipeline 310 and placed downstream of the absorption liquid sample storage container 320, the sample processing structure 330 is used to defoam and / or filter the absorption liquid sample; the ion chromatography analysis module 400 is connected to the sample preparation pipeline 310, and the ion chromatography analysis module 400 is used to detect the absorption liquid sample transported by the sample preparation pipeline 310; the data acquisition and control module 600 is electrically connected to the acquisition component 100, the absorption liquid supply component 200, the absorption liquid sample preparation component 300 and the ion chromatography analysis module 400, and the data acquisition and control module 600 is used to realize the linkage control and data storage of the acquisition component 100, the absorption liquid supply component 200, the absorption liquid sample preparation component 300 and the ion chromatography analysis module 400.

[0055] Overall, the organic amine online monitoring system can achieve comprehensive detection of gaseous, droplet and aerosol organic amines and their main degradation products through multi-stage collection, reliable absorption liquid supply, precise sample processing and preparation, high-precision ion chromatography analysis, and intelligent data collection and control. Its detection limit can reach 0.1ppm, realizing efficient, non-destructive capture and precise detection of organic amine escape and main degradation product emissions in carbon capture devices, improving detection accuracy, and thus better meeting the monitoring requirements of organic amine escape and main degradation product emissions in carbon capture devices.

[0056] Specifically, the present invention can collect the flue gas to be tested in the flue 10 through the sampling gun 110, and by controlling the heating temperature of the heating device 111 on the sampling gun 110, for example, controlling the heating temperature to about 50°C, thereby avoiding oxidative degradation and thermal degradation of organic amines caused by high temperature, which helps to reduce measurement errors.

[0057] The impact sampling structure 130 enables multi-stage collection of organic amines in flue gas, maximizing the capture of organic amines and their primary degradation products in various forms (e.g., gaseous, liquid, and aerosol), ensuring comprehensive collection. Furthermore, the cooling structure 140 cools the impact sampling structure 130, further improving collection efficiency and reducing the impact of temperature rise and fluctuations on sample composition.

[0058] The absorption liquid supply component 200 can transport the absorption liquid to the impact sampling structure 130, ensuring the orderly supply of the absorption liquid during the sampling process. The absorption liquid can efficiently absorb the gaseous organic amines and their main degradation products in the airflow, thereby improving the collection effect of the organic amines and their degradation products, and helping to improve the accuracy of the detection results.

[0059] The sample processing structure 330 in the absorption liquid sample preparation component 300 can be used to defoam and / or filter the absorption liquid sample, thereby effectively removing bubbles and insoluble impurities in the absorption liquid sample, thereby improving the quality of the sample, providing a purer sample for subsequent ion chromatography analysis, and helping to enhance the reliability of the analysis results.

[0060] Ion chromatography analysis module 400 can be used to analyze the prepared absorption liquid sample. It has a high detection accuracy of 0.1 ppm, meeting the requirements for monitoring the emission of organic amines and their main degradation products. Compared with other analytical methods (such as FTIR and PTR-ToF-MS), high-efficiency ion chromatography analysis technology also has advantages in cost and maintenance, making it suitable for long-term, stable online operation.

[0061] In addition, the data acquisition and control module 600 realizes the linkage control and data storage among all the components, which helps to make the system operation more automated and intelligent. Users can monitor the working status and collected data of each component in real time through the data acquisition and control module 600, and can obtain the detection results in a timely manner.

[0062] In the embodiments of the present invention, designers can adjust the specific structure of the data acquisition and control module 600 according to their needs and are not specifically limited here. Preferably, the data acquisition and control module 600 is a programmable logic controller, such as a PLC controller. Specifically, the programmable logic controller (PLC) implements the coordinated control and data storage of the acquisition component 100, the absorption liquid supply component 200, the absorption liquid sample preparation component 300, and the ion chromatography analysis module 400 through a preset control program.

[0063] In an embodiment of the present invention, the impact sampling structure 130 includes a first impact bottle 131 and a second impact bottle 132 arranged in series, and the collection pipeline 120 includes a first collection pipe section 121, a second collection pipe section 122 and a third collection pipe section 123. The inlet of the first collection pipe section 121 is connected to the sampling gun 110, and the outlet of the first collection pipe section 121 extends into the first impact bottle 131. A first collection control valve is provided on the first collection pipe section 121. The inlet of the second collection pipe section 122 is connected to the upper part of the first impact bottle 131, and the outlet of the second collection pipe section 122 extends into the second impact bottle 132. The third collection pipe section 123 is connected to the upper part of the second impact bottle 132.

[0064] By arranging the first-stage impact bottle 131 and the second-stage impact bottle 132 in series, multi-stage efficient capture of gaseous, droplet and aerosol organic amines and their degradation products is achieved, thereby providing high-quality samples for subsequent analysis and ensuring the accuracy and reliability of the monitoring results.

[0065] Specifically, the first collection pipe section 121 introduces the flue gas collected by the sampling gun 110 into the first impact bottle 131, utilizing the principle of high-speed airflow impact to effectively separate and capture gaseous, droplet, and aerosol organic amines and their degradation products. Uncaptured organic amines and their degradation products can enter the second impact bottle 132 through the second collection pipe section 122, further enhancing the capture effect of gaseous, droplet, and aerosol organic amines and their degradation products, significantly improving the overall capture efficiency and effectiveness. The third collection pipe section 123 allows the sampled airflow to flow out smoothly, avoiding backflow problems. Designers can adjust the specific model of the first collection control valve according to usage needs, and no specific restrictions are imposed here. Preferably, the first control valve is configured as a solenoid valve.

[0066] In the embodiments of the present invention, the designer can adjust the type of absorption liquid in the primary impactor bottle 131 and the secondary impactor bottle 132 according to the actual use requirements, and there is no specific limitation here. Preferably, the primary impactor bottle 131 and the secondary impactor bottle 132 use a built-in dilute sulfuric acid absorption liquid, so as to efficiently absorb gaseous organic amines, large-particle droplets of organic amines, and some degradation products (such as NH3) in the airflow.

[0067] In an embodiment of the present invention, a first impact collection plate 133 is provided in the first impact bottle 131, and a first nozzle 124 is provided at the outlet of the first collection pipe section 121, and the first nozzle 124 is arranged toward the first impact collection plate 133; and / or a second impact collection plate 134 is provided in the second impact bottle 132, and a second nozzle 125 is provided at the outlet of the second collection pipe section 122, and the second nozzle 125 is arranged toward the second impact collection plate 134.

[0068] The collection method in which the first nozzle 124 cooperates with the first impact collection plate 133 and the second nozzle 125 cooperates with the second impact collection plate 134 significantly improves the capture efficiency and accuracy of polymorphic organic amines and their degradation products.

[0069] Specifically, the first nozzle 124 generates a high-speed jet of air that strikes the first impaction collection plate 133, effectively capturing the polymorphic organic amines and their degradation products through the principle of inertial collision, ensuring maximum capture of the polymorphic organic amines and their degradation products within the first impaction bottle 131. The second nozzle 125 generates a high-speed jet of air that strikes the second impaction collection plate 134, thereby capturing any uncaptured polymorphic organic amines and their degradation products, improving the capture efficiency.

[0070] Designers can adjust the specific structure of the first nozzle 124 and the second nozzle 125 according to the needs of use, and no specific limitation is made here. Figure 2 In the illustrated embodiment, the first nozzle 124 is a single circular nozzle structure. The front end of the first nozzle 124 is a converging section 1241, and the rear end of the first nozzle 124 is a straight section 1242. Furthermore, the length L1 of the straight section 1242 of the first nozzle 124 is 1 to 3 times the inner diameter d of the straight section 1242 of the first nozzle 124. The distance L2 between the straight section 1242 of the first nozzle 124 and the first impact collection plate 133 below the first nozzle 124 is 1 to 4 times the inner diameter of the straight section 1242 of the first nozzle 124.

[0071] More preferably, the first nozzle 124 and the second nozzle 125 have the same shape, structure and size, so that the first nozzle 124 and the second nozzle 125 have the same capture effect, thereby improving the capture efficiency.

[0072] Designers can adjust the specific structures of the first impact and collection plate 133 and the second impact and collection plate 134 based on their specific needs and are not specifically limited here. Preferably, the first impact and collection plate 133 is a circular flat plate with a diameter D that is 10 to 20 times the inner diameter d of the straight cylindrical section of the first nozzle 124. Furthermore, the first impact and collection plate 133 can be secured to the first collection tube section 121 via a plurality of supports 127.

[0073] More preferably, the first impact collection plate 133 and the second impact collection plate 134 have the same shape, structure and size, so that the first impact collection plate 133 and the second impact collection plate 134 have the same capturing function.

[0074] During the sampling process, the sampling airflow is ejected from first nozzle 124 and second nozzle 125 at a high velocity of approximately 90 m / s, impacting first impaction collection plate 133 and second impaction collection plate 134. Based on the principle of inertial collision, the airflow captures droplets and aerosols. This structure also has a high capture efficiency of over 90% for small droplets and aerosolized organic amines. Furthermore, the high-speed impact of the airflow on the absorption liquid creates intense turbulence, dispersing the gas into tiny bubbles or droplets, significantly increasing the gas-liquid contact area. Furthermore, the absorption liquid is dilute sulfuric acid, significantly improving the capture efficiency of gaseous organic amines and degradation products.

[0075] By cooperating with the first nozzle 124 and the first impact collection plate 133, and the second nozzle 125 and the second impact collection plate 134, aerosol-state organic amines can be efficiently captured without setting a pre-filter membrane. All forms of organic amines can be captured at one time for subsequent analysis of the organic amines, and the escape level of organic amines can be accurately quantified and the operating loss and environmental impact of the absorbent caused by the escape of organic amines can be evaluated.

[0076] In an embodiment of the present invention, the collection assembly 100 further includes an air extraction device 126 disposed at the outlet of the third collection pipe section 123. The air extraction device 126 effectively controls the sampling flow rate, ensuring airflow stability and smoothness throughout the sampling process, avoiding uneven sampling due to airflow fluctuations, and helping to accelerate the passage of smoke through the primary and secondary impactor bottles 131, 132, thereby improving collection efficiency.

[0077] The designer can adjust the specific structure of the air extraction device 126 according to the use requirements, and no specific limitation is made here. Preferably, the air extraction device 126 is an air extraction pump.

[0078] In an embodiment of the present invention, the collection assembly 100 further includes a drying structure 150 and an air filtering structure 160 , which are sequentially arranged on the third collection pipe section 123 along the direction from the secondary impact bottle 132 to the air extraction device 126 .

[0079] By setting the drying structure 150 and the air filtering structure 160 on the third collection pipe section 123, the drying structure 150 can remove moisture in the flue gas to prevent water vapor from affecting the exhaust device 126, while the air filtering structure 160 can filter impurities and harmful components in the flue gas to avoid polluting the environment.

[0080] In an embodiment of the present invention, the drying structure 150 includes a first dryer 151 and a second dryer 152 arranged in parallel on the third collection pipe section 123, and a first collection control valve group arranged on the third collection pipe section 123. The first collection control valve group is used to control the on and off states of the first dryer 151 and the second dryer 152.

[0081] By arranging the first dryer 151 and the second dryer 152 in parallel, combined with the on-off control function of the first collection control valve group, the alternating use and efficient management of the dryers are achieved.

[0082] By cooperating with the first dryer 151 and the second dryer 152, not only can the drying function be continuously provided during the long sampling process, avoiding the performance degradation or failure of a single dryer due to saturation, but the saturated dryer can also be replaced or regenerated without stopping the machine, thereby ensuring the stable operation of the sampling system.

[0083] In a specific embodiment, the first collection control valve group includes a first collection three-way valve 153 arranged upstream of the drying structure 150 and connected to the first dryer 151 and the second dryer 152 respectively, a second collection control valve 154 arranged downstream of the first dryer 151, and a third collection control valve 155 arranged downstream of the second dryer 152. The second collection control valve 154 and the third collection control valve 155 are arranged in parallel.

[0084] Designers can adjust the specific models of the first collection three-way valve 153, the second collection control valve 154, and the third collection control valve 155 according to usage needs, and there is no specific limitation here. Preferably, the first collection three-way valve 153, the second collection control valve 154, and the third collection control valve 155 are all configured as solenoid valves.

[0085] In an embodiment of the present invention, the air filtering structure 160 includes a first air filter 161 and a second air filter 162 arranged in parallel on the third collection pipe section 123, and a second collection control valve 154 group arranged on the third collection pipe section 123. The second collection control valve 154 group is used to control the on and off status of the first air filter 161 and the second air filter 162.

[0086] The coordination of first and second air filters 161, 162 significantly enhances the reliability and ease of maintenance of the sampling system. If the performance of one filter degrades due to impurity accumulation, the second collection control valve 154 can be used to switch to the other filter, thus ensuring uninterrupted filtration. Furthermore, alternating use of first and second air filters 161, 162 allows for online replacement or cleaning of saturated filters, reducing system downtime and improving operational efficiency.

[0087] In a specific embodiment, the second collection control valve 154 group includes a second collection three-way valve 163 arranged upstream of the air filtering structure 160 and connected to the first air filter 161 and the second air filter 162 respectively, a fourth collection control valve 164 arranged downstream of the first air filter 161, and a fifth collection control valve 165 arranged downstream of the second air filter 162. The fourth collection control valve 164 and the fifth collection control valve 165 are arranged in parallel.

[0088] Designers can adjust the specific models of the second collection three-way valve 163, the fourth collection control valve 164, and the fifth collection control valve 165 according to usage needs, and there is no specific limitation here. Preferably, the second collection three-way valve 163, the fourth collection control valve 164, and the fifth collection control valve 165 are all configured as solenoid valves.

[0089] In an embodiment of the present invention, the collection assembly 100 further includes a mass flow meter 170 . The mass flow meter 170 is disposed on the third collection pipe section 123 between the air filtering structure 160 and the air extraction device 126 .

[0090] By setting a mass flow meter 170 on the third collection pipe section 123 between the air filtration structure 160 and the exhaust device 126, the gas flow during the sampling process can be monitored and accurately controlled in real time, ensuring the stability and accuracy of the sampling flow and avoiding flow deviations caused by changes in the external environment or fluctuations in equipment operation.

[0091] Moreover, through the feedback function of the mass flow meter 170, dynamic adjustment of the vacuum device 126 can be achieved, the operating efficiency of the entire system can be optimized, and reliable flow parameter support can be provided for subsequent data analysis, further enhancing the credibility and scientific nature of the sampling results.

[0092] In an embodiment of the present invention, the organic amine online monitoring system also includes a compressed air purge structure 500, which includes a purge pipeline 510, and a pressure reducing valve 511, a pressure gauge 512 and a purge three-way valve 513 arranged in sequence on the purge pipeline 510 along the air inlet direction. The inlet of the purge pipeline 510 is connected to the first collection pipe section 121 located between the first collection control valve and the first-level impact bottle 131 through the purge three-way valve 513.

[0093] The compressed air purge structure 500 enables efficient cleaning and maintenance of the entire sampling system. Specifically, the purified compressed air effectively removes residual sample or impurities from key components such as the primary impactor bottle 131, the secondary impactor bottle 132, and the sampling gun 110, preventing cross-contamination and ensuring the accuracy of sampling results. This ensures the long-term stable operation of the system and provides reliable support for high-precision, continuous online monitoring of organic amines.

[0094] In an embodiment of the invention, the cooling structure 140 includes a cooling water tank 141 and a chiller 142 connected to the cooling water tank 141 . The primary impactor bottle 131 and the secondary impactor bottle 132 are arranged side by side in the cooling water tank 141 .

[0095] By placing the primary and secondary impactor bottles 131 and 132 side by side in a cooling water tank 141 and using a chiller 142 to generate low-temperature cooling water for constant temperature control of the cooling water tank 141, the sample in the impactor bottle is effectively cooled, significantly reducing the thermal decomposition or evaporation loss of volatile substances such as organic amines during the sampling process, ensuring the integrity and representativeness of the sample. Furthermore, the constant temperature of the cooling water tank 141 stabilizes the gas-liquid phase equilibrium within the impactor bottle, reducing sampling errors caused by temperature fluctuations, thereby improving the accuracy and reliability of monitoring data.

[0096] The designer can adjust the specific cooling temperature of the cooling water tank 141 according to the use requirements, and no specific limitation is made here. Preferably, the cooling temperature of the cooling water tank 141 is controlled at about 4°C.

[0097] In an embodiment of the present invention, the absorption liquid supply assembly 200 includes a first absorption liquid supply structure 210 for connecting to the primary impact bottle 131, and a second absorption liquid supply structure 220 for connecting to the secondary impact bottle 132. The first absorption liquid supply structure 210 is used to transport the absorption liquid to the primary impact bottle 131, and the second absorption liquid supply structure 220 is used to transport the absorption liquid to the secondary impact bottle 132.

[0098] The first absorption liquid supply structure 210 and the second absorption liquid supply structure 220 are separately provided to achieve independent delivery and precise control of the absorption liquid in the primary impactor bottle 131 and the secondary impactor bottle 132. This not only ensures an adequate supply of absorption liquid in the primary impactor bottle 131 and the secondary impactor bottle 132, thereby avoiding reduced sampling efficiency or sample loss due to insufficient liquid level, but also enables the absorption liquid flow rate and concentration to be adjusted according to the different sampling requirements of the primary impactor bottle 131 and the secondary impactor bottle 132, thereby improving the targetedness and accuracy of sampling.

[0099] Furthermore, the relatively independent first absorption liquid supply structure 210 and second absorption liquid supply structure 220 are easy to maintain and replace, which reduces the possibility of system failure and further improves the stability and reliability of the organic amine online monitoring system.

[0100] In an embodiment of the present invention, the first absorption liquid supply structure 210 includes a first absorption liquid bottle 211, a first absorption liquid pipeline 212 for connecting the first absorption liquid bottle 211 and the first impact bottle 131, and a first peristaltic pump 213 and a first absorption liquid control valve 214 sequentially arranged on the first absorption liquid pipeline 212 along the direction from the first absorption liquid bottle 211 to the first impact bottle 131; and / or, the second absorption liquid supply structure 220 includes a second absorption liquid bottle 221, a second absorption liquid pipeline 222 for connecting the second absorption liquid bottle 221 and the second impact bottle 132, and a second peristaltic pump 223 and a second absorption liquid control valve 224 sequentially arranged on the second absorption liquid pipeline 222 along the direction from the second absorption liquid bottle 221 to the second impact bottle 132.

[0101] Preferably, the first absorption liquid supply structure 210 includes a first absorption liquid bottle 211, a first absorption liquid pipeline 212 for connecting the first absorption liquid bottle 211 and the first impact bottle 131, and a first peristaltic pump 213 and a first absorption liquid control valve 214 sequentially arranged on the first absorption liquid pipeline 212 along the direction from the first absorption liquid bottle 211 to the first impact bottle 131; and the second absorption liquid supply structure 220 includes a second absorption liquid bottle 221, a second absorption liquid pipeline 222 for connecting the second absorption liquid bottle 221 and the second impact bottle 132, and a second peristaltic pump 223 and a second absorption liquid control valve 224 sequentially arranged on the second absorption liquid pipeline 222 along the direction from the second absorption liquid bottle 221 to the second impact bottle 132.

[0102] Designers can adjust the specific models of the first absorption liquid control valve 214 and the second absorption liquid control valve 224 according to usage needs, and no specific restrictions are imposed here. Preferably, the first absorption liquid control valve 214 and the second absorption liquid control valve 224 are both configured as solenoid valves.

[0103] In an embodiment of the present invention, the inlet of the sample preparation pipeline 310 is connected to the first-stage impactor bottle 131 and the second-stage impactor bottle 132 respectively, and the outlet of the sample preparation pipeline 310 is connected to the ion chromatography analysis module 400. A sample preparation control valve group is provided on the sample preparation pipeline 310, and the sample preparation control valve group is used to control the on-off state of the sample preparation pipeline 310.

[0104] The inlet of the sample preparation pipeline 310 is connected to the primary impact bottle 131 and the secondary impact bottle 132 respectively, so that the collected samples can be collected and transported to the absorption liquid sample storage container 320, and the outlet of the sample preparation pipeline 310 is connected to the ion chromatography analysis module 400, so that the absorption liquid sample can be transported to the ion chromatography analysis module 400, and the absorption liquid sample can be efficiently analyzed using the ion chromatography analysis module 400.

[0105] Furthermore, by providing a sample preparation control valve group on the sample preparation pipeline 310, the on-off state of the pipeline can be precisely controlled to ensure that the sample is transferred to the ion chromatography analysis module 400 within an appropriate time period, thereby improving the automation and reliability of the sampling and analysis process.

[0106] In a specific embodiment, the sample preparation control valve group includes a first sample control valve 311 disposed downstream of the primary impactor bottle 131, a second sample control valve 312 disposed downstream of the secondary impactor bottle 132, and a third sample control valve 313 disposed between the absorption liquid sample storage container 320 and the sample processing structure 330.

[0107] Designers can adjust the specific models of the first sample control valve 311, the second sample control valve 312, and the third sample control valve 313 according to usage needs, and no specific restrictions are imposed here. Preferably, the first sample control valve 311, the second sample control valve 312, and the third sample control valve 313 are all configured as solenoid valves.

[0108] In an embodiment of the present invention, the sample processing structure 330 includes a debubbler 331 and a sample filter 332 which are sequentially arranged on the sample preparation pipeline 310 along the conveying direction of the sample preparation pipeline 310 .

[0109] The installation of a debubbler 331 and a sample filter 332 on the sample preparation line 310 effectively addresses the potential for bubbles and impurities during sample delivery. The debubbler 331 removes tiny bubbles from the sample, preventing them from interfering with subsequent analysis module results and ensuring the stability and accuracy of the detection signal. The sample filter 332 removes solid particles and other impurities from the sample, protecting key components of the ion chromatography analysis module 400 from damage and extending the device's service life.

[0110] Designers can adjust the specific model of debubbler 331 based on usage needs, and this is not a specific limitation. For example, debubbler 331, including but not limited to membrane degassing, can be used to remove bubbles from the liquid sample. A filter membrane with a pore size of 0.22 μm, made of materials including but not limited to polytetrafluoroethylene (PTFE), can be used to intercept insoluble components in the liquid sample. The liquid sample then enters ion chromatography analysis module 400 for analysis, ensuring stable operation of the ion chromatography analysis and improving detection accuracy.

[0111] In an embodiment of the present invention, the absorption liquid sample preparation component 300 further includes an external discharge pipeline 340 , which is connected to the sample preparation pipeline 310 located between the absorption liquid sample storage container 320 and the third sample control valve 313 , and an external discharge control valve 341 is provided on the external discharge pipeline 340 .

[0112] Excess or unqualified samples can be promptly discharged through the external discharge pipeline 340, effectively preventing sample accumulation or backflow in the pipeline and contamination of the absorption liquid sample storage container 320, thereby ensuring the purity of the samples within the system and the accuracy of the analysis. Furthermore, the provision of an external discharge control valve 341 makes the discharge process more controllable and can be flexibly adjusted according to actual needs, further enhancing the stability and operational flexibility of the system.

[0113] Designers can adjust the specific model of the external discharge control valve 341 according to the use requirements, and no specific limitation is made here. Preferably, the external discharge control valve 341 is configured as a solenoid valve.

[0114] In an embodiment of the present invention, the absorption fluid sample preparation assembly 300 further includes a liquid level sensor 321 disposed in the absorption fluid sample storage container 320 .

[0115] By setting a liquid level sensor 321 in the absorption liquid sample storage container 320, the liquid level sensor 321 can be used to monitor the liquid level status in the container in real time, and the data can be fed back to the data acquisition and control module 600, thereby realizing accurate management of the absorption liquid storage volume, and effectively avoiding system operation abnormalities caused by too high or too low liquid level. For example, too low liquid level may cause the sample to be unable to be stored normally, while too high liquid level may cause overflow or contamination risks, which is conducive to improving the automation and safety of the system and ensuring the stability and reliability of the absorption liquid sample preparation process.

[0116] In an embodiment of the present invention, the heating temperature range of the heating device 111 is 50°C ± 5°C.

[0117] By setting the heating temperature range to 50°C ± 5°C, the temperature conditions during sample processing can be precisely controlled, effectively preventing high-temperature-induced oxidative and thermal degradation of organic amines, thereby maximizing sample stability and original properties. This temperature range not only ensures the optimal physical and chemical properties of the absorption solution, but also reduces measurement errors caused by temperature fluctuations, significantly improving the accuracy and reliability of test results.

[0118] Designers can adjust the specific heating temperature of the heating device 111 according to usage needs, and no specific numerical value is imposed here. In one feasible embodiment, the temperature of the heating device 111 is set to be slightly higher than the actual flue gas temperature by 5°C to 10°C. Preferably, the heating temperature of the heating device 111 is about 50°C.

[0119] By controlling the heating device 111 at 50°C ± 5°C, the condensation loss of organic amines in the collection pipeline 120 can be avoided, and the oxidative degradation and thermal degradation of organic amines caused by the sampling pipelines in other sampling methods, which are usually heated to higher temperatures (such as the FTIR sampling pipeline and gas analysis cell heating temperature of 180°C and the PTR-ToF-MS pipeline heating temperature of 100°C), can be avoided, which leads to measurement errors.

[0120] All articles and references disclosed, including patent applications and publications, are incorporated herein by reference for all purposes. The term "essentially consisting of..." describing a combination should include the identified elements, ingredients, parts or steps and other elements, ingredients, parts or steps that do not substantially affect the basic novel features of the combination. The use of the terms "comprising" or "including" to describe the combination of elements, ingredients, parts or steps herein also contemplates an embodiment that is essentially composed of these elements, ingredients, parts or steps. By using the term "may", it is intended to illustrate that any attribute described that "may" include is optional. Multiple elements, ingredients, parts or steps can be provided by a single integrated element, ingredient, part or step. Alternatively, a single integrated element, ingredient, part or step can be divided into separate multiple elements, ingredients, parts or steps. The disclosure "one" or "an" used to describe an element, ingredient, part or step is not intended to exclude other elements, ingredients, parts or steps.

[0121] Each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. The above embodiments are only for illustrating the technical concept and features of the present invention. Their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the scope of protection of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. An organic amine online monitoring system, characterized in that: include: A collection assembly, the collection assembly comprising a sampling gun provided with a heating device, a collection pipeline connected to the sampling gun, an impact sampling structure provided on the collection pipeline, and a cooling structure, the impact sampling structure being capable of performing a multi-stage collection operation of organic ammonia in the flue gas, and the cooling structure being used to cool the impact sampling structure; an absorption liquid supply assembly, the absorption liquid supply assembly being connected to the impact sampling structure and being used to deliver the absorption liquid to the impact sampling structure; An absorption liquid sample preparation assembly, the absorption liquid sample preparation assembly comprising a sample preparation pipeline for communicating with the impact sampling structure, an absorption liquid sample storage container disposed on the sample preparation pipeline, and a sample processing structure disposed on the sample preparation pipeline and downstream of the absorption liquid sample storage container, the sample processing structure being used to perform defoaming and / or filtering treatment on the absorption liquid sample; an ion chromatography analysis module, the ion chromatography analysis module being connected to the sample preparation pipeline and being used to detect the absorption liquid sample transported by the sample preparation pipeline; A data acquisition and control module is electrically connected to the acquisition component, the absorption liquid supply component, the absorption liquid sample preparation component and the ion chromatography analysis module. The data acquisition and control module is used to realize the linkage control and data storage of the acquisition component, the absorption liquid supply component, the absorption liquid sample preparation component and the ion chromatography analysis module.

2. The organic amine online monitoring system according to claim 1, characterized in that: The impact sampling structure includes a first-level impact bottle and a second-level impact bottle arranged in series. The collection pipeline includes a first collection pipe section, a second collection pipe section and a third collection pipe section. The inlet of the first collection pipe section is connected to the sampling gun, and the outlet of the first collection pipe section extends into the first-level impact bottle. The first collection pipe section is provided with a first collection control valve. The inlet of the second collection pipe section is connected to the upper part of the first-level impact bottle, the outlet of the second collection pipe section extends into the second-level impact bottle, and the third collection pipe section is connected to the upper part of the second-level impact bottle.

3. The organic amine online monitoring system according to claim 2, characterized in that: A first impact collection plate is provided in the first-stage impact bottle, a first nozzle is provided at the outlet of the first collection pipe section, and the first nozzle is arranged toward the first impact collection plate; and / or a second impact collection plate is provided in the second-stage impact bottle, a second nozzle is provided at the outlet of the second collection pipe section, and the second nozzle is arranged toward the second impact collection plate.

4. The organic amine online monitoring system according to claim 2, characterized in that: The collection component further includes an air extraction device arranged at the outlet of the third collection pipe section.

5. The organic amine online monitoring system according to claim 4, characterized in that: The collection assembly further includes a drying structure and an air filtering structure, which are sequentially arranged on the third collection pipe section along the direction from the secondary impact bottle to the air extraction device.

6. The organic amine online monitoring system according to claim 5, characterized in that: The drying structure includes a first dryer and a second dryer arranged in parallel on the third collection pipe section, and a first collection control valve group arranged on the third collection pipe section, wherein the first collection control valve group is used to control the on / off status of the first dryer and the second dryer.

7. The organic amine online monitoring system according to claim 6, characterized in that: The first collection control valve group includes a first collection three-way valve arranged upstream of the drying structure and connected to the first dryer and the second dryer respectively, a second collection control valve arranged downstream of the first dryer, and a third collection control valve arranged downstream of the second dryer. The second collection control valve and the third collection control valve are arranged in parallel.

8. The organic amine online monitoring system according to claim 5, characterized in that: The air filtering structure includes a first air filter and a second air filter arranged in parallel on the third collection pipe section, and a second collection control valve group arranged on the third collection pipe section, and the second collection control valve group is used to control the on and off status of the first air filter and the second air filter.

9. The organic amine online monitoring system according to claim 8, characterized in that: The second collection control valve group includes a second collection three-way valve arranged upstream of the air filtration structure and connected to the first air filter and the second air filter respectively, a fourth collection control valve arranged downstream of the first air filter, and a fifth collection control valve arranged downstream of the second air filter. The fourth collection control valve and the fifth collection control valve are arranged in parallel.

10. The organic amine online monitoring system according to claim 5, characterized in that: The collection component further includes a mass flow meter, which is arranged on the third collection pipe section between the air filtering structure and the air extraction device.

11. The organic amine online monitoring system according to claim 2, characterized in that: The organic amine online monitoring system also includes a compressed air purge structure, which includes a purge pipeline, and a pressure reducing valve, a pressure gauge, and a purge three-way valve arranged on the purge pipeline in sequence along the air inlet direction. The inlet of the purge pipeline is connected to the first collection pipe section located between the first collection control valve and the first-level impact bottle through the purge three-way valve.

12. The organic amine online monitoring system according to claim 2, characterized in that: The cooling structure includes a cooling water tank and a water chiller connected to the cooling water tank. The first-stage impact bottle and the second-stage impact bottle are arranged side by side in the cooling water tank.

13. The organic amine online monitoring system according to claim 2, characterized in that: The absorption liquid supply assembly includes a first absorption liquid supply structure for connecting to the primary impact bottle, and a second absorption liquid supply structure for connecting to the secondary impact bottle. The first absorption liquid supply structure is used to transport the absorption liquid to the primary impact bottle, and the second absorption liquid supply structure is used to transport the absorption liquid to the secondary impact bottle.

14. The organic amine online monitoring system according to claim 13, wherein: The first absorption liquid supply structure includes a first absorption liquid bottle, a first absorption liquid pipeline for connecting the first absorption liquid bottle and the first impact bottle, and a first peristaltic pump and a first absorption liquid control valve sequentially arranged on the first absorption liquid pipeline along the direction from the first absorption liquid bottle to the first impact bottle; and / or, the second absorption liquid supply structure includes a second absorption liquid bottle, a second absorption liquid pipeline for connecting the second absorption liquid bottle and the second impact bottle, and a second peristaltic pump and a second absorption liquid control valve sequentially arranged on the second absorption liquid pipeline along the direction from the second absorption liquid bottle to the second impact bottle.

15. The organic amine online monitoring system according to claim 2, characterized in that: The inlet of the sample preparation pipeline is connected to the first-level impact bottle and the second-level impact bottle respectively, and the outlet of the sample preparation pipeline is connected to the ion chromatography analysis module. A sample preparation control valve group is provided on the sample preparation pipeline, and the sample preparation control valve group is used to control the on-off state of the sample preparation pipeline.

16. The organic amine online monitoring system according to claim 15, characterized in that: The sample preparation control valve group includes a first sample control valve disposed downstream of the primary impactor bottle, a second sample control valve disposed downstream of the secondary impactor bottle, and a third sample control valve disposed between the absorption liquid sample storage container and the sample processing structure.

17. The organic amine online monitoring system according to claim 16, characterized in that: The sample processing structure includes a debubbler and a sample filter which are sequentially arranged on the sample preparation pipeline along a conveying direction of the sample preparation pipeline.

18. The organic amine online monitoring system according to claim 16, wherein: The absorption liquid sample preparation component further includes an external discharge pipeline, which is connected to the sample preparation pipeline located between the absorption liquid sample storage container and the third sample control valve. An external discharge control valve is provided on the external discharge pipeline.

19. The organic amine online monitoring system according to claim 1, wherein: The absorption liquid sample preparation assembly further includes a liquid level sensor disposed in the absorption liquid sample storage container.

20. The organic amine online monitoring system according to claim 1, wherein: The heating temperature range of the heating device is 50°C ± 5°C.

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