Two-channel online measurement system and method for effective components and thermal degradation products of absorbent

Abstract

The invention relates to an absorbent effective component and thermal degradation product dual-channel online measurement system and method, the system comprises a system body, the system body comprises a quantitative liquid taking module, a reciprocating ion exchange module, a self-switching dual-channel conveying module, an AI measurement and analysis module, and a waste liquid purification and discharge module. The quantitative liquid taking module is used for accurately controlling the sample amount, the reciprocating ion exchange module is used for improving efficient exchange of thermal stable salt, the self-switching double-channel conveying module is used for realizing quick and alternate switching of double indexes, the AI measurement and analysis module is used for measuring technical indexes in real time, and the waste liquid purification and discharge module is used for controlling compliant discharge of pollutants. Through the process operation of each module, on one hand, the defects of the existing absorbent purification technology can be made up, the change conditions of key materials and pollutants can be evaluated on line, on the other hand, the existing index test process can be simplified, multi-index synchronous measurement with relatively high time resolution is realized, and the overall timeliness is improved.

Description

Technical Field

[0001] This invention relates to the field of absorbent purification and recovery technology, specifically to a dual-channel online measurement system and method for absorbent effective components and thermal degradation products. Background Technology

[0002] In chemical absorption CO2 capture systems, the effective component amine in the amine absorbent is affected by impurities in the flue gas (such as O2, SO2, NO2, etc.), and the absorbent itself also contains some impurities. These factors can lead to irreversible degradation reactions of the organic amine absorbent, producing a series of degradation products. The accumulation of these degradation products not only results in the loss of organic amines in the absorbent but also causes a series of operational problems such as equipment corrosion and decreased system performance.

[0003] Degradation products are classified into neutral degradation products and ionic degradation products based on their electroneutrality in solution. Currently, the latter receives more attention and is usually characterized by the content of thermally stable salts. Effectively measuring the content of the effective components amines and thermally stable salts in amine-based absorbents and establishing their correlation is of paramount importance for the long-term stable operation of chemical carbon capture systems.

[0004] Currently, commonly used methods for measuring the effective component amine include acid-base titration, potentiometric titration, and ion chromatography. Methods for measuring the thermally stable salt content include resin exchange combined with acid-base titration and ion chromatography. However, all these methods require removing the amine sample from the carbon capture system, performing a series of pretreatment operations, and then using different experimental setups or analytical instruments for measurement. Using these methods to track key materials and contaminants in carbon capture systems generally results in poor timeliness, low automation and time resolution, and inadequate compatibility and feedback with future carbon capture system requirements.

[0005] Therefore, there is an urgent need to develop a system or method to measure the effective components and thermal degradation products of absorbents online in order to assess changes in key materials and pollutants. Summary of the Invention

[0006] The purpose of this invention is to provide a dual-channel online measurement system and method for absorbent effective components and thermal degradation products, so as to evaluate the changes in key materials and pollutants in the carbon capture system online, which is beneficial to guide the system to operate more scientifically and efficiently.

[0007] To achieve the above objectives, the first aspect of the present invention provides a dual-channel online measurement system for effective components of absorbents and thermal degradation products. The system includes: a system body, the system body including a quantitative liquid sampling module, a reciprocating ion exchange module, a self-switching dual-channel delivery module, an AI measurement and analysis module, and a waste liquid purification and discharge module. The system body is equipped with an inlet pipe and an outlet pipe. The inlet pipe is connected to the lean liquid delivery pipe of the carbon capture system, and the outlet pipe returns to the lean liquid delivery pipe. The inlet pipe and the outlet pipe are respectively connected to the quantitative liquid extraction module. The quantitative liquid dispensing module includes a first quantitative ring and a second quantitative ring arranged in parallel. The first quantitative ring is connected to the reciprocating ion exchange module, and the second quantitative ring is connected to the self-switching dual-channel delivery module. The reciprocating ion exchange module includes a reciprocating sliding ion exchange resin slider, which is connected to a pure water tank, an acid tank, and the self-switching dual-channel conveying module. The self-switching dual-channel delivery module includes a first liquid storage tank, a second liquid storage tank, and a three-way solenoid valve. The first liquid storage tank and the second liquid storage tank are respectively connected to the three-way solenoid valve, and the three-way solenoid valve is connected to the AI ​​measurement and analysis module. The AI ​​measurement and analysis module includes an online potentiometric titration analyzer and a data processing cloud platform. The online potentiometric titration analyzer is connected to the waste liquid purification and discharge module.

[0008] Optionally, the first metering ring is connected to the inlet pipe, and the second metering ring is connected to the outlet pipe.

[0009] Optionally, the first metering ring is connected to the ion exchange resin slider in the reciprocating ion exchange module, and the second metering ring is connected to the second liquid storage tank in the self-switching dual-channel delivery module.

[0010] Optionally, the ion exchange resin slider is filled with cation exchange resin.

[0011] Optionally, the ion exchange resin slider is connected to the first storage tank in the self-switching dual-channel delivery module.

[0012] Optionally, the three-way solenoid valve is connected to the online potentiometric titration analyzer in the AI ​​measurement and analysis module.

[0013] Optionally, the waste liquid purification and discharge module includes a waste liquid storage tank, which is equipped with a pH sensor and is connected to a reagent tank.

[0014] Optionally, the waste liquid storage tank is connected to an online potentiometric titration analyzer.

[0015] A second aspect of the present invention provides a dual-channel online measurement method for the effective components of an absorbent and thermal degradation products. This method uses the system provided in the first aspect of the present invention and includes: The sample to be tested from the lean liquid delivery line of the carbon capture system is delivered to the first and second quantitative loops in the quantitative liquid sampling module; The sample to be tested in the first quantitative loop is transported to the ion exchange resin slider in the reciprocating ion exchange module for processing, and the processed sample to be tested is transported to the first storage tank in the self-switching dual-channel transport module. The sample to be tested in the second quantitative loop is transported to the second liquid storage tank in the self-switching dual-channel delivery module; The samples to be tested in the first and second storage tanks are alternately transported to the online potentiometric titration analyzer in the AI ​​measurement and analysis module via a three-way solenoid valve, where the content of thermal degradation products and the concentration of amines are measured respectively. The measurement data are transmitted to the data processing cloud platform in real time.

[0016] Optionally, the method further includes: discharging the solution measured by the online potentiometric titration analyzer into the waste liquid storage tank of the waste liquid purification and discharge module, determining whether it meets the discharge requirements based on the pH sensor, and adjusting the pH value by providing different reagents through the reagent tank, and discharging it after it meets the standard.

[0017] Through the above technical solutions, this invention establishes a method and system for online synchronous measurement of the concentration of amine, an effective component of absorbent, and the total content of thermally stable salts from thermal degradation products. The system utilizes a quantitative liquid sampling module to precisely control sample volume, a reciprocating ion exchange module to improve the efficient exchange of thermally stable salts, a self-switching dual-channel delivery module to achieve rapid alternation between the two indicators, an AI measurement and analysis module to measure technical indicators in real time, and a waste liquid purification and discharge module to control the compliant discharge of pollutants. By streamlining the operation of each module, this invention can, on the one hand, compensate for the deficiencies of existing absorbent purification technologies and assess the changes in key materials and pollutants online; on the other hand, it simplifies existing indicator testing procedures, achieves relatively high temporal resolution for simultaneous measurement of multiple indicators, and improves overall timeliness.

[0018] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the following detailed description to explain the invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the dual-channel online measurement system for the effective components of the absorbent and thermal degradation products of the present invention.

[0020] Explanation of reference numerals in the attached figures 1-System body, 2-Quantitative liquid dispensing module, 3-Reciprocating ion exchange module, 4-Self-switching dual-channel delivery module, 5-AI measurement and analysis module, 6-Waste liquid purification and discharge module, 7-Lean liquid delivery pipeline, 8-First quantitative loop, 9-Ion exchange resin slider, 10-Pure water tank, 11-Acid tank, 12-First storage tank, 13-Three-way solenoid valve, 14-Online potentiometric titration analyzer, 15-Data processing cloud platform, 16-Waste liquid storage tank, 17-pH sensor, 18-Reagent tank, 19-Second quantitative loop, 20-Second storage tank. Detailed Implementation

[0021] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0022] The first aspect of this invention provides a dual-channel online measurement system for the effective components of an absorbent and its thermal degradation products, see [link to relevant documentation]. Figure 1 The system includes: a system body 1, which includes a quantitative liquid sampling module 2, a reciprocating ion exchange module 3, a self-switching dual-channel delivery module 4, an AI measurement and analysis module 5, and a waste liquid purification and discharge module 6. The system body 1 is provided with an inlet pipe and an outlet pipe. The inlet pipe is connected to the lean liquid delivery pipe 7 of the carbon capture system, and the outlet pipe returns to the lean liquid delivery pipe 7. The inlet pipe and the outlet pipe are respectively connected to the quantitative liquid extraction module 2. The quantitative liquid sampling module 2 includes a first quantitative ring 8 and a second quantitative ring 19 arranged in parallel. The first quantitative ring 8 is connected to the reciprocating ion exchange module 3, and the second quantitative ring 19 is connected to the self-switching dual-channel delivery module 4. The reciprocating ion exchange module 3 includes a reciprocating sliding ion exchange resin slider 9, which is connected to the pure water tank 10, the acid tank 11, and the self-switching dual-channel conveying module 4. The self-switching dual-channel delivery module 4 includes a first liquid storage tank 12, a second liquid storage tank 20, and a three-way solenoid valve 13. The first liquid storage tank 12 and the second liquid storage tank 20 are respectively connected to the three-way solenoid valve 13, and the three-way solenoid valve 13 is connected to the AI ​​measurement and analysis module 5. The AI ​​measurement and analysis module 5 includes an online potentiometric titration analyzer 14 and a data processing cloud platform 15. The online potentiometric titration analyzer 14 is connected to the waste liquid purification and discharge module 6.

[0023] According to the present invention, optionally, the first metering ring 8 is connected to the inlet pipe, and the second metering ring 19 is connected to the outlet pipe. The first metering ring 8 and the second metering ring 19 are filled with a certain volume of the sample to be tested, which is used to transport it to several subsequent modules for processing and measurement. Excess sample to be tested is returned to the outlet pipe of the system body 1.

[0024] According to the present invention, optionally, the first quantitative ring 8 is connected to the ion exchange resin slider 9 in the reciprocating ion exchange module 3, and the second quantitative ring 19 is connected to the second storage tank 20 in the self-switching dual-channel delivery module 4. The second storage tank 20 is used to store the sample solution to be tested from the second quantitative ring 19 and deliver it to subsequent modules for amine concentration measurement.

[0025] According to the present invention, optionally, the ion exchange resin slider 9 is filled with cation exchange resin.

[0026] According to the present invention, optionally, the ion exchange resin slider 9 is connected to the first storage tank 12 in the self-switching dual-channel delivery module 4. The first storage tank 12 is used to store the test solution that has been treated by the ion exchange resin and transport it to the subsequent module for measurement of the content of thermal degradation products.

[0027] According to the present invention, optionally, the three-way solenoid valve 13 is connected to the online potentiometric titration analyzer 14 in the AI ​​measurement and analysis module 5. The three-way solenoid valve 13 is used to automatically switch the flow path according to the edited timing control, and alternately deliver the solution in the storage tank to the AI ​​measurement and analysis module 5 for detection and analysis.

[0028] According to the present invention, optionally, the waste liquid purification and discharge module 6 includes a waste liquid storage tank 16, the waste liquid storage tank 16 is provided with a pH sensor 17, and the waste liquid storage tank 16 is connected to the reagent tank 18.

[0029] According to the present invention, optionally, the waste liquid storage tank 16 is connected to an online potentiometric titration analyzer 14.

[0030] According to the present invention, optionally, the pure water tank 10 is used to provide pure water, which can, on the one hand, fully dilute the sample to be tested to ensure that the thermal degradation products therein can be detected by subsequent modules, and on the other hand, clean the cation exchange resin filled inside the ion exchange resin slider 9.

[0031] According to the present invention, optionally, the acid tank 11 is used to provide an acid solution of a certain concentration to regenerate the cation exchange resin filled inside the ion exchange resin slider 9.

[0032] A second aspect of the present invention provides a dual-channel online measurement method for the effective components of an absorbent and thermal degradation products. This method uses the system provided in the first aspect of the present invention and includes: The sample to be tested from the lean liquid delivery line 7 of the carbon capture system is delivered to the first quantitative loop 8 and the second quantitative loop 19 in the quantitative liquid sampling module 2; The sample to be tested in the first quantitative ring 8 is transported to the ion exchange resin slider 9 in the reciprocating ion exchange module 3 for processing, and the processed sample to be tested is transported to the first liquid storage tank 12 in the self-switching dual-channel transport module 4. The sample to be tested in the second quantitative ring 19 is transported to the second liquid storage tank 20 in the self-switching dual-channel transport module 4; The samples to be tested in the first storage tank 12 and the second storage tank 20 are alternately transported to the online potentiometric titration analyzer 14 in the AI ​​measurement and analysis module 5 via a three-way solenoid valve 13, respectively, to measure the content of thermal degradation products and the concentration of amines. The measurement data are transmitted to the data processing cloud platform 15 in real time.

[0033] According to the present invention, optionally, the method further includes: discharging the solution measured by the online potentiometric titration analyzer 14 into the waste liquid storage tank 16 of the waste liquid purification and discharge module 6, determining whether it meets the discharge requirements based on the pH sensor 17, and adjusting the pH value by providing different reagents through the reagent tank 18, and discharging the solution after it meets the standard.

[0034] In one specific embodiment of the present invention, a bypass sampling tube is installed on the lean liquid delivery pipeline 7 of the chemical absorption carbon capture system to connect the system body 1 with the carbon capture system. The bypass sampling tube leads the sample to be tested into a module inside the system body 1. After a certain volume of the sample is taken by the quantitative liquid sampling module 2, the excess sample is transported back from the system body 1 to the lean liquid delivery pipeline 7.

[0035] When the sample to be tested flows through the quantitative sampling module 2, a certain volume of solution is filled into the core components of the quantitative sampling module 2: the first quantitative ring 8 and the second quantitative ring 19. The two quantitative rings are connected in parallel. The fixed volume of the sample solution in the quantitative rings is then transported to several subsequent modules for processing and measurement according to the process settings. Specifically, the sample solution in the first quantitative ring 8 is connected to the first storage tank 12 in the thermal degradation product content channel of the reciprocating ion exchange module 3, where the thermal degradation product content is determined after pretreatment. The sample solution in the second quantitative ring 19 is connected to the second storage tank 20 in the amine concentration measurement channel of the self-switching dual-channel delivery module 4, where the amine concentration is subsequently determined.

[0036] When determining the content of thermal degradation products, the sample to be tested is first processed through the reciprocating ion exchange module 3. The sample is fully diluted with sufficient pure water provided by the pure water tank 10. The ion exchange resin slider 9, which is filled with cation exchange resin, slides back and forth according to the process setting to make full contact with the sample to be tested and retain the cations of thermal degradation products in the sample. The processed solution is then transported to the first storage tank 12 in the thermal degradation product measurement channel of the self-switching dual-channel transport module 4.

[0037] The solutions in the two storage tanks are automatically switched via a three-way solenoid valve 13 according to a pre-programmed timing control, alternately delivering solutions with different measurement indicators to the AI ​​measurement and analysis module 5. The online potentiometric titration analyzer 14 performs rapid detection and analysis using potentiometric titration, first determining the content of thermal degradation products and then the amine concentration. The measurement data is transmitted in real-time to the data processing cloud platform 15. The platform, equipped with an AI data analysis assistant, establishes a relationship curve between thermal degradation products and amine concentration through comparative analysis of the measurement data. This curve is then fed back to the carbon capture system's central control platform, providing suggestions for subsequent operation and management, such as whether chemical absorbent purification needs to be activated or whether the chemical absorbent needs to be replaced.

[0038] The solution titrated by the AI ​​measurement and analysis module 5 will be discharged into the waste liquid storage tank 16 of the waste liquid purification and discharge module 6. The built-in pH sensor 17 will track and detect the pH value of the waste liquid to determine whether it meets the discharge requirements. If it is too acidic or too alkaline, the reagent tank 18 will provide different reagents for treatment. After it meets the standards, it will be discharged out of the system through the discharge pipeline.

[0039] In addition to the sample measurement mode described above, the system also features a self-cleaning mode. While measuring the amine concentration, the acid tank 11 first provides a certain concentration of acid to regenerate the cation exchange resin filling the ion exchange resin slider 9. Then, the pure water tank 10 provides sufficient pure water to flush the thermal degradation product measurement channel. After the amine concentration measurement is completed, the three-way solenoid valve 13 switches to the thermal degradation product measurement channel, and the cleaning solution is directly discharged into the waste liquid storage tank 16 of the waste liquid purification and discharge module 6. Simultaneously, the amine concentration measurement channel is also flushed with sufficient pure water provided by the pure water tank 10. During the next round of thermal degradation product pretreatment of the test solution, the three-way solenoid valve 13 switches to the amine concentration measurement channel, and the cleaning solution is directly discharged into the waste liquid storage tank 16 of the waste liquid purification and discharge module 6.

[0040] The above-described embodiments of the present invention achieve the following technical effects: In use, the system body 1 can be coupled to the CO2 chemical absorption capture system; the amount of sample to be measured is precisely controlled by two quantitative loops in the quantitative liquid sampling module 2; the ion exchange resin slider 9 in the reciprocating ion exchange module 3 improves the efficient exchange pretreatment of thermal degradation products; the self-switching dual-channel delivery module 4 sets the thermal degradation product measurement channel and the amine concentration measurement channel, and achieves rapid alternation of the dual measurement channels with the help of a predetermined program and a three-way solenoid valve 13; the AI ​​measurement and analysis module 5 quickly measures technical indicators and transmits the data in real time to the data processing cloud platform 15 for data tracking analysis and operation management suggestions; the measured solution is sent to the waste liquid purification and discharge module 6, and pH control is used to ensure compliant discharge of pollutants. Through the streamlined operation of each module, the present invention can, on the one hand, compensate for the deficiencies of existing absorbent purification technologies, and on the other hand, simplify existing indicator testing procedures, achieving relatively high time resolution for simultaneous measurement of multiple indicators, thus improving overall timeliness.

[0041] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0042] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

[0043] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed by the present invention.

Claims

1. A dual-channel online measurement system for the effective components and thermal degradation products of an absorbent, characterized in that, The system includes: a system body (1), which includes a quantitative liquid sampling module (2), a reciprocating ion exchange module (3), a self-switching dual-channel delivery module (4), an AI measurement and analysis module (5), and a waste liquid purification and discharge module (6). The system body (1) is provided with an inlet pipe and an outlet pipe. The inlet pipe is connected to the lean liquid delivery pipe (7) of the carbon capture system, and the outlet pipe is connected back to the lean liquid delivery pipe (7). The inlet pipe and the outlet pipe are respectively connected to the quantitative liquid extraction module (2). The quantitative liquid dispensing module (2) includes a first quantitative ring (8) and a second quantitative ring (19) arranged in parallel. The first quantitative ring (8) is connected to the reciprocating ion exchange module (3), and the second quantitative ring (19) is connected to the self-switching dual-channel delivery module (4). The reciprocating ion exchange module (3) includes a reciprocating sliding ion exchange resin slider (9), which is connected to the pure water tank (10), the acid tank (11), and the self-switching dual-channel delivery module (4) respectively. The self-switching dual-channel delivery module (4) includes a first liquid storage tank (12), a second liquid storage tank (20), and a three-way solenoid valve (13). The first liquid storage tank (12) and the second liquid storage tank (20) are respectively connected to the three-way solenoid valve (13), and the three-way solenoid valve (13) is connected to the AI ​​measurement and analysis module (5). The AI ​​measurement and analysis module (5) includes an online potentiometric titration analyzer (14) and a data processing cloud platform (15). The online potentiometric titration analyzer (14) is connected to the waste liquid purification and discharge module (6).

2. The system according to claim 1, wherein, The first metering ring (8) is connected to the inlet pipe, and the second metering ring (19) is connected to the outlet pipe.

3. The system according to claim 1, wherein, The first quantitative ring (8) is connected to the ion exchange resin slider (9) in the reciprocating ion exchange module (3), and the second quantitative ring (19) is connected to the second liquid storage tank (20) in the self-switching dual-channel delivery module (4).

4. The system according to claim 1, wherein, The ion exchange resin slider (9) is filled with cation exchange resin.

5. The system according to claim 1, wherein, The ion exchange resin slider (9) is connected to the first liquid storage tank (12) in the self-switching dual-channel delivery module (4).

6. The system according to claim 1, wherein, The three-way solenoid valve (13) is connected to the online potentiometric titration analyzer (14) in the AI ​​measurement and analysis module (5).

7. The system according to claim 1, wherein, The waste liquid purification and discharge module (6) includes a waste liquid storage tank (16), which is equipped with a pH sensor (17) and is connected to a reagent tank (18).

8. The system according to claim 7, wherein, The waste liquid storage tank (16) is connected to the online potentiometric titration analyzer (14).

9. A dual-channel online measurement method for the effective components and thermal degradation products of an absorbent, characterized in that, The method uses the system of any one of claims 1-8, and the method comprises: The sample to be tested from the lean liquid delivery line (7) of the carbon capture system is delivered to the first quantitative loop (8) and the second quantitative loop (19) in the quantitative liquid sampling module (2). The sample to be tested in the first quantitative ring (8) is transported to the ion exchange resin slider (9) in the reciprocating ion exchange module (3) for processing, and the processed sample to be tested is transported to the first storage tank (12) in the self-switching dual-channel transport module (4). The sample to be tested in the second quantitative ring (19) is transported to the second liquid storage tank (20) in the self-switching dual-channel delivery module (4); The sample to be tested in the first storage tank (12) and the sample to be tested in the second storage tank (20) are alternately transported to the online potentiometric titration analyzer (14) in the AI ​​measurement and analysis module (5) through the three-way solenoid valve (13) to measure the content of thermal degradation products and the concentration of amines respectively. The measurement data are transmitted to the data processing cloud platform (15) in real time.

10. The method according to claim 9, wherein, The method further includes: discharging the solution measured by the online potentiometric titration analyzer (14) into the waste liquid storage tank (16) of the waste liquid purification and discharge module (6), judging whether it meets the discharge requirements according to the pH sensor (17), and providing different reagents through the reagent tank (18) to adjust the pH value. After meeting the standard, the solution is discharged.

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