Method and system for measuring absorbent loss rate in operation process of carbon capture device

Abstract

The invention discloses a method and system for measuring the absorbent loss rate in the operation process of a carbon capture device, and belongs to the field of carbon capture testing. The measurement method provided by the invention comprises the following steps: introducing a marker into an absorbent, and carrying out carbon capture; in the operation process of the carbon capture device, obtaining the concentration of the active component and the concentration of the marker in the absorbent at different times; and based on the obtained concentrations of the active components and the marker in the absorbent at different times, calculating to obtain the loss amounts of the active components of the absorbent in different time periods. According to the invention, the marker is introduced into the absorbent and is taken as a reference point of the concentration change of the active component in the absorbent, so that the loss rate of the active component in the absorbent in the operation process of the carbon capture device can be more accurately measured, the degradation resistance and loss cost of the absorbent can be accurately evaluated, and the more stable absorbent can be developed; the measurement method and the measurement system provided by the invention have good application prospects in the carbon capture system.

Description

Technical Field

[0001] The invention belongs to the field of carbon capture testing, and in particular relates to a method and a system for measuring an absorbent loss rate during the operation of a carbon capture device. Background Art

[0002] Coal-fired power plants, steel mills, cement plants and other major carbon emission industrial sources can achieve large-scale carbon dioxide emission reduction through carbon capture technology. Among the many carbon capture technologies, chemical absorption carbon capture is a mature technology with broad application prospects. In chemical absorption carbon capture technology, absorbent is the key material. The alkaline compounds in the absorbent (generally organic amines such as ethanolamine, N-methyldiethanolamine, piperazine, etc.) are used to react with CO in the flue gas. 2 A reversible acid-base reaction occurs in the absorber to produce bicarbonate, carbonate or carbamate, etc., which are then heated in the desorption tower to release CO. 2 , so that the absorbent circulates back and forth, thereby achieving CO 2 However, due to the presence of O 2 As well as the high temperature of over 100°C during the desorption process, the organic amine in the absorbent will undergo oxidative degradation and thermal degradation during long-term operation. In addition, the absorbent will escape with the flue gas volatilization, which will lead to the loss of the absorbent. Accurately evaluating the loss of the absorbent during operation is of great significance to the development and promotion of chemical absorption carbon capture technology.

[0003] At present, the main method for determining the absorbent loss during the operation of the carbon capture device is to sample the absorbent during operation, measure the amine concentration of the sample, and then compare the measured amine concentration with the amine concentration of the newly configured absorbent, and the absorbent loss is known by the change in amine concentration. To use this method to measure the accurate absorbent loss, it is necessary to know the accurate total amount of absorbent at the time of sampling, calculate the total amine mass at the time of sampling by multiplying the measured concentration by the total volume of the absorbent, and compare the total amine mass when the absorbent is configured to calculate the consumed amine. The carbon capture device needs to maintain a dynamic water balance, so that the moisture in the inlet wet flue gas, the moisture in the outlet flue gas, the sewage, the desorption tower condensate return water, and the CO 2 The moisture content in the product gas exhaust and the supplementary moisture are within a certain range, and the water content in the system is constantly changing; and during the operation of the carbon capture device, the absorbent will be distributed in equipment and pipelines including the absorption tower, desorption tower, and heat exchanger, resulting in the total volume of the absorbent being difficult to effectively measure, and therefore it is also difficult to obtain accurate absorbent loss. Summary of the invention

[0004] In order to overcome at least one of the problems existing in the above-mentioned prior art, one of the objectives of the present invention is to provide a method for measuring the absorbent loss rate during the operation of a carbon capture device, which can effectively and accurately measure the absorbent loss rate during the operation of a carbon capture device.

[0005] A second object of the present invention is to provide a system for measuring the absorbent loss rate during the operation of a carbon capture device.

[0006] A third object of the present invention is to provide a device for measuring the absorbent loss rate during the operation of a carbon capture device.

[0007] A third object of the present invention is to provide a carbon capture system.

[0008] In order to achieve the above object, the technical solution adopted by the present invention is: A first aspect of the present invention provides a method for measuring the absorbent loss rate during the operation of a carbon capture device, comprising: Introducing markers into absorbents for carbon capture; During the operation of the carbon capture device, the concentration of active components and markers in the absorbent at different times are obtained; Based on the active component concentration and marker concentration in the absorbent obtained at different times, the active component loss rate of the absorbent in different time periods is calculated.

[0009] At present, the commonly used method for measuring the loss rate of the absorbent is to obtain it by measuring the change in the concentration of the active components in the absorbent. This method actually uses water as a reference point. However, during the operation of the carbon capture device, the water in the system will volatilize or be brought in by wet flue gas, resulting in the total amount of water in the system constantly changing. Therefore, this method using water as a reference point will have a large measurement deviation. The present invention introduces a marker into the absorbent, and the marker has good stability in the carbon capture cycle. It is used as a reference point for the change in the concentration of the active components in the absorbent, and can more accurately measure the loss rate of the active components in the absorbent during the operation of the carbon capture device.

[0010] In some embodiments of the present invention, the measuring method comprises: Introducing markers into absorbents for carbon capture; Obtaining a first concentration of an active component and a first concentration of a marker in the absorbent at a first time; Obtaining a second concentration of the active component and a second concentration of the marker in the absorbent at a second time; Based on the first concentration of active components and the first concentration of marker in the absorbent at the first time, and the second concentration of active components and the second concentration of marker in the absorbent at the second time, the active component loss rate of the absorbent in the time period from the first time to the second time is calculated.

[0011] In some embodiments of the present invention, the number of active component types in the absorbent is 1-10.

[0012] In some embodiments of the present invention, the active component contained in the absorbent includes an amine compound; in some specific embodiments of the present invention, the amine compound includes at least one of a primary amine compound, a secondary amine compound or a tertiary amine compound.

[0013] In some embodiments of the present invention, the marker comprises a water-soluble inorganic salt; in some specific embodiments of the present invention, the water-soluble inorganic salt comprises a water-soluble carbonate, a water-soluble bicarbonate or a combination thereof; in some more specific embodiments of the present invention, the water-soluble inorganic salt comprises at least one of potassium carbonate, potassium bicarbonate, sodium carbonate or sodium bicarbonate.

[0014] As a marker, water-soluble inorganic salts have the advantages of good solubility (especially soluble in absorbent), stable properties, non-volatility, and no interference with the carbon capture performance of the absorbent during the operation of the carbon capture device. Among them, water-soluble carbonates and water-soluble bicarbonates are particularly suitable for use as markers in the present invention because both types of salts are soluble in water, have extremely low vapor pressures, are almost non-volatile, and not only do not interfere with the capture performance of the original absorbent, but can also promote carbon capture to a certain extent. This is mainly because water-soluble carbonates and water-soluble bicarbonates are soluble in CO. 2 During the capture process, it can effectively promote the 2 Absorption reaction and CO 2 The desorption reaction proceeds, and water-soluble carbonates are beneficial to promote CO 2 Absorption reaction, water-soluble bicarbonate is beneficial to promote CO 2 Desorption reaction.

[0015] In some embodiments of the present invention, the concentration of the marker in the absorbent is 0.01-5 wt %.

[0016] Theoretically, the type and concentration range of the marker do not affect the measurement results. However, considering the stability of the marker in the carbon capture process, in order to ensure that the marker does not volatilize or degrade during the operation of the carbon capture device, and has a certain effect on the absorption of CO by the absorbent, 2There is no negative impact. Based on the considerations of measurement accuracy and measurement cost, the above-mentioned marker types and marker concentration ranges are proposed. The use of the above-mentioned marker types and marker concentration ranges can ensure good measurement effects and carbon capture effects, but the present invention is not limited to the above-mentioned marker types and marker concentration ranges.

[0017] A second aspect of the present invention provides a system for measuring absorbent loss rate during operation of a carbon capture device, comprising: A marker introduction module, used for introducing a marker into an absorbent; A concentration acquisition module, used to obtain the concentration of active components and markers in the absorbent at different times during the operation of the carbon capture device; The loss rate calculation module is used to calculate the active component loss rate of the absorbent in different time periods based on the active component concentration and marker concentration in the absorbent obtained at different times.

[0018] The third aspect of the present invention provides a device for measuring the absorbent loss rate during the operation of a carbon capture device, the measuring device comprising: a processor and a memory storing computer program instructions; when the processor executes the computer program instructions, the measuring method as described in the first aspect of the present invention is implemented.

[0019] A fourth aspect of the present invention provides a carbon capture system, comprising the measurement system as described in the second aspect of the present invention, or the measurement device as described in the third aspect of the present invention.

[0020] The beneficial effects of the present invention are as follows: the present invention introduces a marker into the absorbent and uses it as a reference point for the concentration change of the active component in the absorbent, which can more accurately measure the loss rate of the active component in the absorbent during the operation of the carbon capture device, thereby facilitating the accurate evaluation of the anti-degradation performance and loss cost of the absorbent, as well as the development of a more stable absorbent. The measurement method and measurement system of the present invention have good application prospects in carbon capture systems. DETAILED DESCRIPTION

[0021] The content of the present invention is further described in detail below through specific examples. It should also be understood that the following examples are only used to further illustrate the present invention and cannot be construed as limiting the scope of protection of the present invention. Some non-essential improvements and adjustments made by those skilled in the art based on the principles set forth in the present invention all belong to the scope of protection of the present invention. The specific process parameters and the like in the following examples are also only examples within a suitable range, that is, those skilled in the art can make a selection within a suitable range through the description herein, and are not limited to the specific data exemplified below. The raw materials, reagents or devices used in the following examples and comparative examples, unless otherwise specified, can all be obtained from conventional commercial sources, or can be obtained by existing known methods.

[0022] A first aspect of an embodiment of the present invention provides a method for measuring an absorbent loss rate during operation of a carbon capture device, comprising: Introducing markers into absorbents for carbon capture; During the operation of the carbon capture device, the concentration of active components and markers in the absorbent at different times are obtained; Based on the active component concentration and marker concentration in the absorbent obtained at different times, the active component loss rate of the absorbent in different time periods is calculated.

[0023] At present, the commonly used method for measuring the loss rate of the absorbent is to obtain it by measuring the change in the concentration of the active components in the absorbent. This method actually uses water as a reference point. However, during the operation of the carbon capture device, the water in the system will volatilize or be brought in by wet flue gas, resulting in the total amount of water in the system constantly changing. Therefore, this method using water as a reference point will have a large measurement deviation. The present invention introduces a marker into the absorbent, and the marker has good stability in the carbon capture cycle. It is used as a reference point for the change in the concentration of the active components in the absorbent, and can more accurately measure the loss rate of the active components in the absorbent during the operation of the carbon capture device.

[0024] In the present invention, the absorbent loss rate refers to the loss rate of active components in the absorbent. For example, the loss rate of an amine absorbent refers to the loss rate of the amine component in the amine absorbent.

[0025] In the present invention, the method for introducing the marker can be a mixing method, that is, the marker and the absorbent are mixed, and no special treatment is required.

[0026] In some embodiments of the present invention, the measuring method comprises: Introducing markers into absorbents for carbon capture; Obtaining a first concentration of an active component and a first concentration of a marker in the absorbent at a first time; Obtaining a second concentration of the active component and a second concentration of the marker in the absorbent at a second time; Based on the first concentration of active components and the first concentration of marker in the absorbent at the first time, and the second concentration of active components and the second concentration of marker in the absorbent at the second time, the active component loss rate of the absorbent in the time period from the first time to the second time is calculated.

[0027] In the present invention, the first time and the second time can be set according to actual needs. By using the method of the present invention, the loss rate of active components of the absorbent in any time period can be measured.

[0028] In some specific embodiments of the present invention, the active component in the absorbent is denoted as A1 , A 2 ,……,A n ; The total active component is recorded as A 总 The first concentration of active components in the absorbent at the first time includes: A 1 Active ingredient first concentration C A1T1 , A 2 Active ingredient first concentration C A2T1 ,……,A n Active ingredient first concentration C AnT1 The second concentration of the active component in the absorbent at the second time includes: A 1 Active ingredient second concentration C A1T2 , A 2 Active ingredient second concentration C A2T2 ,……,A n Active ingredient second concentration C AnT2 ; The marker is recorded as K, and the concentration of the marker in the absorbent at the first time is C KT1 , the concentration of the marker in the absorbent at the second time is C KT2 Then, the calculation formula for the loss rate of each active component of the absorbent during the period from the first time to the second time is: ; ; … ; Among them, D A1 , D A2 , D An A 1 , A 2 , A n The loss rate of active components.

[0029] A in the absorbent 1 Taking the active component as an example, the derivation process of the above loss rate calculation formula is as follows: The absorbent composition at the first time is: mass M A总T1 The total active ingredients (including the mass M A1T1 A 1 Active ingredient), mass is M KT1 The marker and mass M WT1 of water, then A 1 The concentration of active ingredient C A1T1 and the concentration of the marker C KT1 for: (1); (2); We can get: (3); Carbon capture runs until the second time, assuming that the water mass decreases by ΔM W , the mass of the total active components is reduced by ΔM A总 (A 1 The mass of active components decreased by ΔM A1 ), while the marker is stable, non-volatile and non-degradable, and its mass remains unchanged, still M KT1 The absorbent composition at this time is: mass M A总T1 -ΔM A总 The total active ingredients (including the mass M A1T1 -ΔM A1 A 1 Active ingredient), mass is M KT1 The marker and mass M WT1 -ΔM W of water, then A 1 The concentration of active ingredient C A1T2 and the concentration of the marker C KT2 for: (4); (5); We can get: (6); A during the time period from the first time to the second time 1 The loss rate of active components is recorded as D A1 ,have: (7); Substituting equation (3) and equation (6) into equation (7), we can obtain: (8).

[0030] It can be seen from formula (8) that after the marker is introduced into the absorbent, only the marker and A need to be measured. 1 The concentration of active components before and after running for a period of time can be accurately obtained. 1 The loss rate of active components.

[0031] Other active ingredients in absorbent A 2 ,……,A n The derivation process of the loss rate calculation formula is similar to that of A 1 The active ingredients are the same.

[0032] In contrast, if no stable marker is introduced, the A 1 Active ingredients and total active ingredients A 总The concentration change is as follows: First time: (9); (10); Second time: (11); (12); Substituting equation (9) and equation (11) into equation (7), we can obtain: (13); From equation (10) and equation (12), we can get: (14); (15); Substituting equation (14) and equation (15) into equation (13), we can obtain: (16).

[0033] It can be seen from formula (16) that the conventional method is used to directly measure A 1 The concentration change of active components requires not only obtaining A 1 Active ingredients and total active ingredients A 总 In addition to the concentration before and after a period of operation, it is also necessary to obtain the total amount of water and the change in water in the system. During the industrial operation of the carbon capture system, the mass of water changes continuously due to volatilization or the introduction of wet flue gas, resulting in a mass change of ΔM before and after operation. W Unable to determine, resulting in A 1 Loss rate of active components D A1 It is impossible to measure accurately. The existing conventional method directly assumes that the water quality has not changed, that is, ΔM W This obviously leads to measurement deviation.

[0034] In some specific embodiments of the present invention, when the absorbent contains multiple active components, the total loss rate of the active components of the absorbent is D 总 It can be calculated by the following formula: .

[0035] In some embodiments of the present invention, the active components in the absorbent and the number of their types can be set according to specific circumstances, such as being adjusted according to the carbon capture working conditions and the carbon capture system, and the present invention does not specifically limit this. In some specific embodiments of the present invention, the number n of active component types in the absorbent is 1 to 10, more specifically 1 to 5, for example, it can be any value of 1, 2, 3, 4 or 5, or a range of values ​​between any two.

[0036] In some embodiments of the present invention, the active components contained in the absorbent include amine compounds; in some specific embodiments of the present invention, the amine compounds include at least one of primary amine compounds, secondary amine compounds or tertiary amine compounds. For example, the primary amine compounds may be monoethanolamine (MEA), diethylene glycolamine (DGA), and 2-amino-2-methyl-1-propanol (AMP), etc.; the secondary amine compounds may be diethanolamine (DEA), diisopropanolamine (DIPA), piperazine (PZ), etc.; the tertiary amine compounds may be triethanolamine (TEA), N-methyldiethanolamine (MDEA), etc.

[0037] In some embodiments of the present invention, the marker comprises a water-soluble inorganic salt; in some specific embodiments of the present invention, the water-soluble inorganic salt comprises a water-soluble carbonate, a water-soluble bicarbonate or a combination thereof; in some more specific embodiments of the present invention, the water-soluble inorganic salt comprises at least one of potassium carbonate, potassium bicarbonate, sodium carbonate or sodium bicarbonate.

[0038] As a marker, water-soluble inorganic salts have the advantages of good solubility (especially soluble in absorbent), stable properties, non-volatility, and no interference with the carbon capture performance of the absorbent during the operation of the carbon capture device. Among them, water-soluble carbonates and water-soluble bicarbonates are particularly suitable for use as markers in the present invention because both types of salts are soluble in water, have extremely low vapor pressures, are almost non-volatile, and not only do not interfere with the capture performance of the original absorbent, but can also promote carbon capture to a certain extent. This is mainly because water-soluble carbonates and water-soluble bicarbonates are soluble in CO. 2 During the capture process, it can effectively promote the 2 Absorption reaction and CO 2 The desorption reaction proceeds, and water-soluble carbonates are beneficial to promote CO 2 Absorption reaction, water-soluble bicarbonate is beneficial to promote CO 2 Desorption reaction, the specific reaction can be expressed as follows: CO 2 +H 2 O+CO 3 2- → 2HCO 3 - (CO 2 absorption reaction); 2HCO 3 - → CO 2 ↑+H 2 O+CO 3 2- (CO 2 desorption reaction).

[0039] More specifically, the water-soluble carbonate may be potassium carbonate, sodium carbonate or a combination thereof, and the water-soluble bicarbonate may be potassium bicarbonate, sodium bicarbonate or a combination thereof. Taking potassium carbonate and potassium bicarbonate as examples, they can be used as markers in CO 2 The following reactions occur during the capture process: CO 2 +H 2 O+K 2 CO 3 → 2KHCO 3 (CO 2 absorption reaction); 2KHCO 3 → CO 2 ↑+H 2 O+K 2 CO 3 (CO 2 desorption reaction).

[0040] In some embodiments of the present invention, the concentration of the marker in the absorbent is 0.01~5wt%; in some specific embodiments of the present invention, the concentration of the marker in the absorbent is 0.1~0.5wt%; for example, it can be any value among 0.1wt%, 0.2wt%, 0.3wt%, 0.4wt% or 0.5wt% or a range value between any two of them.

[0041] Theoretically, the type and concentration range of the marker do not affect the measurement results. However, considering the stability of the marker in the carbon capture process, in order to ensure that the marker does not volatilize or degrade during the operation of the carbon capture device, and has a certain effect on the absorption of CO by the absorbent, 2 There is no negative impact. Based on the considerations of measurement accuracy and measurement cost, the above-mentioned marker types and marker concentration ranges are proposed. The use of the above-mentioned marker types and marker concentration ranges can ensure good measurement effects and carbon capture effects, but the present invention is not limited to the above-mentioned marker types and marker concentration ranges.

[0042] A second aspect of an embodiment of the present invention provides a system for measuring absorbent loss rate during operation of a carbon capture device, comprising: A marker introduction module, used for introducing a marker into an absorbent; A concentration acquisition module, used to obtain the concentration of active components and markers in the absorbent at different times during the operation of the carbon capture device; The loss rate calculation module is used to calculate the active component loss rate of the absorbent in different time periods based on the active component concentration and marker concentration in the absorbent obtained at different times.

[0043] In some embodiments of the present invention, a marker introduction module may be disposed at an absorbent inlet of a carbon capture absorber, for introducing a marker into the absorbent at the absorbent inlet of the absorber.

[0044] In some embodiments of the present invention, the concentration acquisition module may be disposed at the absorbent inlet of the carbon capture absorber, and is used to acquire the concentration of active components and markers in the absorbent at the absorbent inlet of the absorber.

[0045] In some embodiments of the present invention, the concentration acquisition module can first take samples from the absorbent and then measure the active component concentration and marker concentration in the sampled sample; the sampling location can be along the absorbent inlet of the absorption tower; the concentration measurement method can be ion chromatography and / or gas chromatography.

[0046] The measurement system provided in the second aspect of the embodiment of the present invention can execute the measurement method provided in the first aspect of the embodiment of the present invention, and its implementation principle and beneficial effects are similar.

[0047] A third aspect of an embodiment of the present invention provides a device for measuring the absorbent loss rate during the operation of a carbon capture device, the measuring device comprising: a processor and a memory storing computer program instructions; when the processor executes the computer program instructions, the measuring method of the first aspect of the present invention is implemented.

[0048] The measuring device provided in the third aspect of the embodiment of the present invention can execute the measuring method provided in the first aspect of the embodiment of the present invention, thereby realizing the measuring method in the first aspect of the embodiment of the present invention and the measuring system in the second aspect of the present invention.

[0049] The measurement system and the measurement device provided in the embodiment of the present invention are based on the measurement method of the first aspect of the embodiment of the present invention. Through the measurement system and the measurement device, the absorbent loss rate during the operation of the carbon capture device can be simply, conveniently and accurately measured.

[0050] A fourth aspect of the present invention provides a carbon capture system, comprising the measurement system according to the second aspect of the present invention, or the measurement device according to the third aspect of the present invention.

[0051] The use of the measurement system or measurement device provided by the present invention in a carbon capture system is conducive to accurately evaluating the anti-degradation performance and loss cost of the absorbent, and developing a more stable absorbent, thereby obtaining a carbon capture system with better carbon capture performance and more stable operation.

[0052] The following provides specific examples to further illustrate the present invention in detail.

[0053] Example 1 A method for measuring absorbent loss rate during operation of a carbon capture device, the specific steps are as follows: The amine components in the carbon capture absorbent are piperazine (PZ) and 2-amino-2-methyl-1-propanol (AMP), with contents of 26wt% and 14wt% respectively. 20 tons of the absorbent were added to an industrial carbon capture device, and the marker K was added. 2 CO 3 , the addition amount is 0.1005 tons, and the absorbent is sampled after adding the marker S 1 , where the marker concentration is 0.5wt% and the potassium ion concentration is C K1 =0.2829wt%, amine component PZ concentration C PZ1 =23.88wt%, amine component AMP concentration C AMP1 =15.92wt%. After 6 months of operation, the absorbent was sampled at the inlet of the absorber. 2 , for S 2 After chemical analysis, the potassium ion concentration C was measured by ion chromatography. K2 =0.2363wt%, the concentration of amine component PZ was measured by gas chromatography PZ2 =16.58wt%, amine component AMP concentration C AMP2 =11.36wt%.

[0054] Then sample S 1 During sampling, the loss rate of the amine component PZ is: ; Sample S 1 During sampling, the loss rate of the amine component AMP is: ; Sample S 1 When sampling, the total amine loss rate of the absorbent is: .

[0055] Comparative Example 1 For the operation process of the carbon capture device in Example 1, the conventional method 1 is adopted (assuming that the water quality before and after the carbon capture operation remains unchanged, i.e. =0), calculate the amine component loss rate, the specific process is as follows: Sample S 1 During sampling, the loss rate of the amine component PZ is: ; Sample S 1 During sampling, the loss rate of the amine component AMP is: ; Sample S 1 When sampling, the total amine loss rate of the absorbent is: .

[0056] Comparative Example 2 For the operation process of the carbon capture device in Example 1, the conventional method 2 (assuming that the total mass of the absorbent before and after the carbon capture operation remains unchanged) is used to calculate the amine component loss rate. The specific process is as follows: Sample S 1 During sampling, the loss rate of the amine component PZ is: ; Sample S 1 During sampling, the loss rate of the amine component AMP is: ; Sample S 1 When sampling, the total amine loss rate of the absorbent is: .

[0057] In order to obtain the actual total amine loss rate of the absorbent, the carbon capture system that had been running for 6 months was stopped, the total amount and concentration of the absorbent in the system were measured, and the actual value of the total amine loss rate of the absorbent was calculated to be 16.82wt%. It can be seen that compared with Comparative Examples 1-2, the loss rate obtained by the method of Example 1 is closer to the actual value and has a higher measurement accuracy.

[0058] As can be seen from the above Example 1, the measurement method of the present invention introduces a marker into the absorbent, and only needs to measure the concentration of the marker and the amine component before and after a period of operation to obtain an accurate loss rate of the amine component. The measurement method does not need to measure the total amount and change of the water component as in the existing conventional method. Since the measurement method of the present invention will not be affected by the change in the quality of the water component during the operation of the carbon capture device, and does not need to measure the total amount of water in the carbon capture system, the measurement process is simple and convenient, and the measurement results are accurate.

[0059] In addition, using K 2 CO 3 As a marker, it is soluble in water, has an extremely low vapor pressure, is almost non-volatile, and not only does it not interfere with the capture performance of the original absorbent, but it can also promote carbon capture to a certain extent, especially to promote CO 2 Absorption reaction improves carbon capture efficiency. Under the same carbon capture conditions such as liquid-gas ratio, the absorbent composed of 24wt% PZ, 16wt% AMP and 60wt% water has a CO 2 The capture rate is 91.1%; the composition is 24wt% PZ, 16wt% AMP, 0.5wt% K 2 CO 3 and 59.5wt% water absorbent, its CO 2 The capture rate is 91.4%. 2 CO3 As a marker, CO2 in the carbon capture system 2 The capture rate has been improved.

[0060] In summary, the present invention introduces a marker into the absorbent and uses it as a reference point for the concentration change of the active component in the absorbent, which can more accurately measure the loss rate of the active component in the absorbent during the operation of the carbon capture device, thereby facilitating the accurate evaluation of the anti-degradation performance and loss cost of the absorbent, as well as the development of a more stable absorbent. The measurement method and measurement system of the present invention have good application prospects in carbon capture systems.

Claims

1. A method for measuring the absorbent loss rate during the operation of a carbon capture device, characterized in that: include: Introducing markers into absorbents for carbon capture; During the operation of the carbon capture device, the concentration of active components and markers in the absorbent at different times are obtained; Based on the active component concentration and marker concentration in the absorbent obtained at different times, the active component loss rate of the absorbent in different time periods is calculated.

2. The measuring method according to claim 1, characterized in that: include: Introducing markers into absorbents for carbon capture; Obtaining a first concentration of an active component and a first concentration of a marker in the absorbent at a first time; Obtaining a second concentration of the active component and a second concentration of the marker in the absorbent at a second time; Based on the first concentration of active components and the first concentration of marker in the absorbent at the first time, and the second concentration of active components and the second concentration of marker in the absorbent at the second time, the active component loss rate of the absorbent in the time period from the first time to the second time is calculated.

3. The measuring method according to claim 1, characterized in that: The active components contained in the absorbent include amine compounds.

4. The measuring method according to claim 1, characterized in that: The marker includes a water-soluble inorganic salt.

5. The measuring method according to claim 4, characterized in that: The water-soluble inorganic salt includes water-soluble carbonate, water-soluble bicarbonate or a combination thereof.

6. The measuring method according to claim 5, characterized in that: The water-soluble inorganic salt includes at least one of potassium carbonate, potassium bicarbonate, sodium carbonate or sodium bicarbonate.

7. The measuring method according to claim 1, characterized in that: The concentration of the marker in the absorbent is 0.01-5wt%.

8. A system for measuring absorbent loss rate during operation of a carbon capture device, characterized in that: include: A marker introduction module, used for introducing a marker into an absorbent; A concentration acquisition module, used to obtain the concentration of active components and markers in the absorbent at different times during the operation of the carbon capture device; The loss rate calculation module is used to calculate the active component loss rate of the absorbent in different time periods based on the active component concentration and marker concentration in the absorbent obtained at different times.

9. A device for measuring the absorbent loss rate during the operation of a carbon capture device, characterized in that: The measuring device comprises: a processor and a memory storing computer program instructions; when the processor executes the computer program instructions, the measuring method according to any one of claims 1 to 7 is implemented.

10. A carbon capture system, characterized in that: Comprising the measuring system as claimed in claim 8, or the measuring device as claimed in claim 9.

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