Detection device and detection method for phase splitting condition in phase splitting liquid

Abstract

The invention discloses a detection device and a detection method for a phase splitting condition in a phase splitting liquid. The detection device comprises a probe sleeve, a probe, a probe connecting line and a control analysis device, the probe sleeve is vertically fixed in the split-phase liquid; the tube wall of the probe sleeve is connected with a plurality of hollow transverse tubes; the probe is placed in the probe sleeve; the probe is provided with a sensor; the probe connecting line is used for connecting the probe and the control analysis device and transmitting a signal detected by the probe to the control analysis device; and the control analysis device is used for controlling the movement of the probe and receiving and analyzing a signal detected by the probe so as to obtain the split-phase condition. Through cooperation of the probe and the probe sleeve, an accurate sensing signal can be obtained, the sensing signal is analyzed through the control analysis device, the phase splitting condition of the phase splitting liquid can be efficiently and accurately obtained, and the detection device is simple in structure, low in production cost, suitable for large-scale popularization and high in practicability. Particularly, the method has a good monitoring and regulating effect on a carbon capture operation process.

Description

Technical Field

[0001] The present invention belongs to the technical field of phase separation detection, and in particular relates to a detection device and a detection method for phase separation conditions in a phase separation liquid. Background Art

[0002] Major carbon emission industrial sources such as coal-fired power plants, steel mills, and cement plants can achieve large-scale carbon dioxide emission reduction through carbon capture technology. Among the many carbon capture technologies, chemical absorption carbon capture is the most mature technology with the broadest application prospects. After years of development, the third-generation two-phase absorbent of chemical absorption carbon capture technology has significant advantages in energy saving and cost reduction and has been widely recognized.

[0003] Two-phase absorbent absorbs CO 2 Phase separation will occur, forming CO 2 The water phase is enriched and contains almost no CO 2 The organic phase only needs to form CO 2 The enriched water phase can be desorbed to achieve CO 2 The capture of CO can significantly reduce the energy consumption of desorption. 2 The phase separation behavior after carbon capture is affected by many factors, including absorption load, viscosity, temperature, etc. Maintaining a stable phase separation state is the basis for the efficient operation of the entire carbon capture system, which is inseparable from the phase separation detection and monitoring of the two-phase absorbent. As a new generation of capture technology, the two-phase absorbent currently lacks efficient two-phase absorbent phase separation detection and monitoring technology.

[0004] A study has proposed a phase interface detection method, which uses multiple conductivity electrodes with decreasing lengths to achieve real-time measurement of the conductivity between adjacent electrodes. However, this measurement method requires multiple conductivity electrodes for detection, and as the volume of the phase separator increases, the number of electrodes required increases, which is inconvenient to use for industrial large-capacity carbon capture devices and greatly increases the cost. In addition, the suspension distribution of many electrodes is easily affected by the flow of solution in the phase separation tank, and the simultaneous movement of all electrodes disturbs the solution and affects the measurement effect.

[0005] Other studies have proposed using an image camera to photograph the glass observation window on the phase separation tank and using image recognition to analyze changes in the phase separation interface. However, this measurement method is greatly affected by the ambient light inside and outside the phase separation tank and by the color difference between the upper and lower phase solutions, which can easily lead to inaccurate recognition. At the same time, it requires that the phase separation interface be within the range of the glass window, which limits the phase separation ratio range of the solution. In addition, this method can only sense whether the solution is phase-separated but cannot sense the situation before and after the solution is about to phase-separate or the phase separation interface disappears, which is not conducive to pre-adjustment. Summary of the invention

[0006] In order to overcome the problems in the existing phase separation detection and monitoring methods, such as complex devices, poor practicability and high costs, one of the objectives of the present invention is to provide a detection device for the phase separation situation in a phase separation liquid, which can accurately and efficiently detect the phase separation situation in the phase separation liquid.

[0007] Another objective of the present invention is to provide a detection method for the phase separation situation in a phase separation liquid.

[0008] Still another objective of the present invention is to provide a monitoring and regulation method for the operation process of carbon capture.

[0009] In order to achieve the above objectives, the technical solutions adopted by the present invention are as follows:

[0010] In the first aspect of the present invention, a detection device for the phase separation situation in a phase separation liquid is provided, including a probe sleeve, a probe, a probe connecting wire and a control and analysis device;

[0011] The probe sleeve is vertically fixed in the phase separation liquid; a plurality of hollow horizontal tubes are connected to the tube wall of the probe sleeve;

[0012] The probe is placed inside the probe sleeve; the probe is provided with a sensor;

[0013] The probe connecting wire is used to connect the probe and the control and analysis device, and transmit the signal detected by the probe to the control and analysis device;

[0014] The control and analysis device is used to control the movement of the probe, and receive and analyze the signal detected by the probe, so as to obtain the phase separation situation.

[0015] In the detection device of the present invention, a probe sleeve connected with hollow horizontal tubes is provided. On the one hand, it enables the probe to only move up and down inside the probe sleeve, avoiding the influence of the liquid in the phase separation liquid on the horizontal position of the probe. On the other hand, it enables the phase separation liquid to smoothly enter the probe sleeve through the hollow horizontal tubes on the tube wall of the probe sleeve and contact the probe, and reduces the phenomenon of the upper and lower layers of the phase separation liquid being mixed with each other due to the up and down movement of the probe, thereby effectively improving the measurement accuracy. Moreover, by combining the analysis of the detection signal of the probe by the detection and analysis module, the phase separation situation can be accurately obtained, providing effective support for the subsequent analysis and regulation of the phase separation behavior.

[0016] In the present invention, the phase separation liquid refers to a liquid that phase separates from a homogeneous liquid phase under specific conditions (such as specific temperature, pressure, reaction, operation, etc.) to form two or more immiscible liquid phases. Specifically, for example: an oil-water mixture, which can be stratified into an oil phase and a water phase after standing; a two-phase absorbent for carbon capture, which can form a rich CO 2 phase and a lean CO 2 phase when reaching the load for phase separation, and so on. 2 phase, etc.

[0017] In some specific embodiments of the present invention, the control and analysis device includes a retracting and releasing module and a detection and analysis module connected to each other; the retracting and releasing module and the detection and analysis module are connected through the probe connecting wire; the retracting and releasing module is used to control the movement of the probe; the detection and analysis module is used to receive and analyze the signals detected by the probe.

[0018] In some more specific embodiments of the present invention, the retracting and releasing module is further used to record the position and height signals of the probe and transmit the position and height signals of the probe to the detection and analysis module; specifically, signal transmission can be carried out through the probe connecting wire.

[0019] In some specific embodiments of the present invention, the retracting and releasing module includes a recovery chamber and a control motor connected to each other; the recovery chamber is used to accommodate the probe connecting wire; the control motor is connected to the detection and analysis module through a signal wire; the detection and analysis module controls the control motor through the signal wire to realize the retraction and release of the probe connecting wire and drive the movement of the probe.

[0020] In some more specific embodiments of the present invention, when the control motor rotates forward, the probe rises; when the control motor rotates in reverse, the probe descends.

[0021] In some specific embodiments of the present invention, the sensor is a conductivity sensor; the signal is conductivity.

[0022] Since the ion concentrations between the two phases in the phase-separated liquid are usually different, resulting in different conductivities, the conductivity can reflect the ion concentration intensity in the solution, thereby the phase separation situation of the phase-separated liquid can be determined.

[0023] In some more specific embodiments of the present invention, the conductivity sensor includes at least one of an electrode-type conductivity sensor, an inductive conductivity sensor, or an ultrasonic conductivity sensor; preferably an electrode-type conductivity sensor.

[0024] In some specific embodiments of the present invention, the phase-separated liquid is a flowing phase-separated liquid or a static phase-separated liquid; in some more specific embodiments of the present invention, the phase-separated liquid is a flowing phase-separated liquid.

[0025] It should be noted that the detection device of the present invention is applicable to both flowing phase-separated liquids and static phase-separated liquids. It's just that there is no simple and efficient detection device for flowing phase-separated liquids in the prior art. When the detection device of the present invention is applied to flowing phase-separated liquids, particularly better detection effects can be achieved compared with the prior art.

[0026] In some specific embodiments of the present invention, if the phase-separated liquid is the phase-separated liquid in a phase-separation container (such as the phase-separated liquid in the phase-separation tank in a carbon capture system), the probe sleeve is vertically fixed in the phase-separation container and contacts the inner bottom of the phase-separation container; further, the phase-separation container has an opening at the top, and the probe sleeve communicates with the opening at the top of the phase-separation container.

[0027] In some specific embodiments of the present invention, the phase-separated liquid is a carbon capture two-phase absorbent.

[0028] After the carbon capture two-phase absorbent absorbs carbon dioxide and phase-separates, there will be a large conductivity gap between the two phases of the two-phase absorbent. The present invention is particularly applicable to the detection of the phase-separation situation of the carbon capture two-phase absorbent, and higher detection sensitivity can be obtained.

[0029] In some specific embodiments of the present invention, the inner diameter of the probe sleeve is R; the inner diameter of the hollow horizontal tube ≤ R; the distribution pitch of the hollow horizontal tube on the tube wall of the probe sleeve ≤ 2R.

[0030] By regulating the inner diameter and distribution pitch of the hollow horizontal tube, it is beneficial for the phase-separated liquid to smoothly enter the probe sleeve to contact the probe, and reduce the phenomenon of the upper and lower layers of the phase-separated liquid mixing due to the up and down movement of the probe, thereby improving the detection accuracy.

[0031] In the present invention, a plurality of hollow horizontal tubes means two or more hollow horizontal tubes, and the specific number can be set according to the actual situation or actual needs of the phase-separated liquid, and the present invention does not make specific limitations.

[0032] In the present invention, the distribution form of the hollow horizontal tube on the tube wall of the probe sleeve can be various, which can be equally spaced distribution or unequally spaced distribution, and can be set according to the actual situation or actual needs of the phase-separated liquid, and the present invention does not make specific limitations.

[0033] In some specific embodiments of the present invention, the probe connecting line includes an inner layer and an outer layer covering the outside of the inner layer; the outer layer is a corrosion-resistant covering material; the inner layer is the signal line of the sensor. In some specific embodiments of the present invention, the inner layer can be the signal line of the conductivity sensor; the outer layer can be an acid and alkali corrosion-resistant covering material. By adopting a double-layer probe connecting line setting in the present invention, a layer of corrosion-resistant material is covered outside the sensor signal line to protect the inner layer material and provide support strength.

[0034] The second aspect of the present invention provides a detection method for different situations in a phase-separated liquid, which is executed by the detection device described in the first aspect of the present invention, and includes the following steps: adjusting the control analysis device to lower the probe to the bottom of the phase-separated liquid and setting it as the zero position; adjusting the control analysis device to move the probe up and down in the probe sleeve while recording the height of the probe relative to the zero position; during the up and down movement of the probe, obtaining a sensing signal through the sensor of the probe, and transmitting the sensing signal to the control analysis device through the probe connection line; using the control analysis device to analyze the sensing signal to obtain a relationship diagram between the sensing signal and the probe height, so as to obtain the phase separation situation of the phase-separated liquid.

[0035] In some specific embodiments of the present invention, the phase separation situation of the phase-separated liquid includes the phase separation state of the phase-separated liquid and / or the position of the phase separation interface after the phase separation of the phase-separated liquid; specifically, the phase separation state of the phase-separated liquid includes no phase separation, about to phase separate, existing phase separation, etc.; the phase separation interface after the phase separation of the phase-separated liquid is located at the position of the probe when the sensing signal jumps.

[0036] For the phase-separated liquid, the sensing signals on both sides of the phase separation interface after phase separation will change greatly. When the probe enters from one phase into another phase, the sensing signal will change significantly. The position of the probe when the sensing signal jumps corresponds to the phase separation interface. Taking the two-phase absorbent for carbon capture as an example, after it absorbs CO 2 it undergoes phase separation, forming a CO-rich 2 aqueous phase containing a large amount of carbonate, bicarbonate, carbamate and other ions. Therefore, the conductivity of the CO-rich 2 aqueous phase is relatively high, while the ion concentration in the other layer of the CO-lean 2 organic phase is very low and the conductivity is very low. When the probe enters the CO-lean 2 organic phase from the CO-rich 2 aqueous phase, or enters the CO-rich 2 aqueous phase from the CO-lean 2 organic phase, the conductivity will change significantly. The position of the probe when the conductivity jumps corresponds to the phase separation interface. In the present invention, the jump can be a change in the sensing signal of ≥20% or more. For example, it can be any value among 20%, 40%, 50%, 80%, 100% or a range value between any two of them.

[0037] In some specific embodiments of the present invention, the time required for the probe to rise from the bottom of the phase-separated liquid to the top of the phase-separated liquid is t, and t ≤ 10 s; in some specific embodiments of the present invention, t ≤ 5 s; for example, it can be any value among 1 s, 2 s, 3 s, 4 s or 5 s or a range value between any two of them.

[0038] The moving speed of the probe within the probe sleeve is related to the internal height of the phase-separated liquid. Since the probe sleeve is provided in the present invention, the moving speed of the probe is less affected by the liquid flow. Therefore, a relatively fast moving speed of the probe can be adopted, greatly shortening the detection time and achieving efficient and accurate detection.

[0039] The third aspect of the present invention provides a method for monitoring and regulating the operation process of carbon capture, which is characterized in that it is executed by the detection device described in the first aspect of the present invention or by the detection method described in the second aspect of the present invention, and includes the following steps: monitoring the phase separation situation of the two-phase absorbent during the carbon capture operation process through the detection device or the detection method, and regulating the carbon capture operation process based on the monitored situation.

[0040] In some specific embodiments of the present invention, the monitoring methods include a continuous monitoring mode, a mixed monitoring mode, or a combination thereof:

[0041] The continuous monitoring mode is: during the carbon capture operation process, controlling the probe to move up and down periodically in the two-phase absorbent to obtain a relationship diagram between the sensing signals at different times and the probe height, so as to obtain the phase separation situation of the two-phase absorbent at different times;

[0042] The mixed monitoring mode is: during the carbon capture operation process, when there is a phase separation interface in the two-phase absorbent, controlling the probe to be fixed on one side of the phase separation interface in the two-phase absorbent, and continuously monitoring the sensing signal at this position. When the sensing signal at this position changes, adjusting the probe to move up and down once to obtain a relationship diagram between the sensing signal and the probe height at this time, so as to obtain the phase separation interface of the two-phase absorbent each time the sensing signal changes.

[0043] Through the continuous monitoring mode or the mixed monitoring mode, the monitoring of the phase separation situation can be realized, and it can be judged whether the height of the phase separation interface shifts, whether the phase separation behavior develops towards phase separation occurrence or phase separation disappearance, etc., so as to provide support for the regulation of the phase separation behavior and facilitate the realization of pre-regulation.

[0044] In some specific embodiments of the present invention, the method for regulating the carbon capture operation process based on the monitored situation includes: when the monitored situation is that there is a phase separation interface in the two-phase absorbent and the phase separation interface shifts, adjusting the phase separation interface by adjusting the CO 2 loading of the two-phase absorbent and / or the upper and lower phase volumes of the two-phase absorbent (specifically, the flow rates of the incoming and outgoing solutions of the phase separation tank can be adjusted); when the monitored situation is that there is a phase separation interface in the two-phase absorbent and the phase separation interface does not shift, but the sensing signal on one side of the phase separation interface changes, adjusting the CO 2Adjust the sensing signal according to the load; when the monitoring situation is that there is a phase separation interface in the two-phase absorbent and the phase separation interface does not shift, and at the same time the sensing signal on one side of the phase separation interface does not change, no regulation is performed. Specifically, adjusting the CO 2 loading of the two-phase absorbent can be achieved by adjusting the carbon capture process, such as adjusting

[0045] By using the detection device or detection method provided by the present invention, efficient and low-cost detection and monitoring of the phase separation of the two-phase absorbent can be realized, which provides key support for the stable operation of the two-phase absorbent, provides an effective regulation method for the carbon capture operation process, and improves the operation efficiency of carbon capture.

[0046] In some specific embodiments of the present invention, adjusting the upper and lower phase volumes of the two-phase absorbent can be: when the phase separation interface shifts upward, increasing the upper phase volume and / or decreasing the lower phase volume; when the phase separation interface shifts downward, decreasing the upper phase volume and / or increasing the lower phase volume. Preferably, the phase separation interface is located at the middle position of the phase separation liquid.

[0047] In some specific embodiments of the present invention, adjusting the CO 2 loading of the two-phase absorbent can be achieved by adjusting the carbon capture process, such as: adjusting the gas-liquid ratio of the carbon capture absorption tower to increase or decrease the CO 2 loading of the two-phase absorbent. Since the sensing signal on one side of the phase separation interface changes, but the phase separation interface remains unchanged, it may be that the CO 2 loading captured by the two-phase absorbent has changed. Monitoring the phase separation interface of the two-phase absorbent is beneficial for monitoring and regulating the carbon capture process, and can pre-regulate the carbon capture process to obtain good carbon capture efficiency.

[0048] The beneficial effects of the present invention are: through the design of the probe sleeve, the probe moves up and down in the probe sleeve, avoiding the offset of the probe in the phase separation liquid, making the measured probe height more accurate. In addition, it also avoids the disturbance of the phase separation liquid caused by the up and down movement of the probe, resulting in the intermixing of the upper and lower layers of the phase separation liquid, making the detection result more accurate. Through the cooperation of the probe and the probe sleeve, an accurate sensing signal can be obtained, and then the control analysis device is used to analyze the sensing signal, so that the phase separation situation of the phase separation liquid can be obtained efficiently, simply and accurately. Moreover, the detection device has a simple structure and low production cost, is suitable for large-scale promotion, and has a good monitoring and regulation effect on the carbon capture operation process in particular. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 It is a schematic structural diagram of a detection device for the phase separation situation in the phase separation liquid adopted in some embodiments of the present invention.

[0050] Figure 2 It is a relationship diagram of conductivity and probe height obtained in some embodiments of the present invention.

[0051] Description of reference numerals in the drawings: 1. Probe sleeve; 11. Hollow horizontal tube; 2. Probe; 3. Probe connection line; 4. Control and analysis device; 41. Retraction and release module; 42. Detection and analysis module; 43. Signal line; 5. Phase separation tank; 51. Lower phase of two-phase absorbent; 52. Upper phase of two-phase absorbent; 53. Phase separation interface of two-phase absorbent; 54. Top interface of two-phase absorbent. Detailed implementation manners

[0052] The content of the present invention will be further described in detail through specific embodiments below. Similarly, it should be understood that the following embodiments are only used to further illustrate the present invention and cannot be construed as limiting the protection scope of the present invention. Some non-essential improvements and adjustments made by those skilled in the art based on the principles described in the present invention all fall within the protection scope of the present invention. The specific process parameters and the like in the following examples are also only an example within a suitable range, that is, those skilled in the art can make selections within a suitable range through the description in this article, rather than being limited to the specific data in the following examples. The raw materials, reagents or devices used in the following examples and comparative examples can be obtained from conventional commercial channels or can be obtained by existing known methods without special instructions.

[0053] Example 1

[0054] Using the detection device as Figure 1 shown, the phase separation situation of the two-phase absorbent in the phase separation tank is monitored and regulated. For a thousand-ton two-phase absorbent CO 2 capture device, the internal height of the phase separation tank 5 is designed according to 1.2 m, the absorbent is an organic solvent-based two-phase absorbent, and after phase separation, the rich CO 2 aqueous phase is in the lower layer, that is, the lower phase 51 is the rich CO 2 aqueous phase; the lean CO 2 organic phase is in the upper layer, that is, the upper phase 52 is the lean CO 2 organic phase; the absorbent also has a phase separation interface 53 and a top interface 54; the upper and lower layer phase separation ratios of the absorbent in laboratory tests are 54%:46%. The specific steps for monitoring and regulation are as follows:

[0055] Fix the probe sleeve 1 vertically in the phase separation tank 5. A plurality of hollow cross tubes 11 are connected to the tube wall of the probe sleeve 1. Place the probe 2 and the probe connection line 3 into the probe sleeve 1. According to the internal depth of the phase separation tank 5, control the detection and analysis module 42 in the analysis device 4 to send a control signal through the signal line 43, so that the control motor in the retraction and release module 41 rotates in reverse, lower the probe 2 to the bottom of the phase separation tank 5, and correct the zero position. At this time, the height of the position where the probe is located is 0.00 m. Then control the control motor in the retraction and release module 41 to rotate forward, and the probe 2 rises. During the rising process of the probe 2, the conductivity of the solution is measured synchronously until the probe 2 rises to a height of 1 m. The position height signal of the probe 2 generated by the rotation of the control motor and the conductivity signal measured by the probe 2 are transmitted to the detection and analysis module 42, forming a coordinate curve with the conductivity data measured by the probe 2 as the X-axis and the probe position data as the Y-axis. For details, please refer to Figure 2 , the probe position data when the conductivity data changes sharply is the height of the phase separation interface. In this example, the measured height of the phase separation interface is 0.63 m.

[0056] During the operation of the carbon capture device, adopt a mixed monitoring mode. After the absorbent phase separation operates stably, place the probe 2 at a position with a height of 0.4 m, 0.23 m away from the phase separation interface 53, and monitor the conductivity at this position in real time. When the conductivity is smaller than the normal phase separation range, automatically complete a detection of the solution up and down to confirm that the phase separation interface 53 has moved down, increase the feed of the phase separation tank and the lean CO 2 Extract the organic phase to keep the phase separation interface 53 at a position near the middle of the phase separation tank 5.

[0057] Example 2

[0058] Adopt the detection device as Figure 1 shown to monitor and regulate the phase separation of the two-phase absorbent in the phase separation tank. For a thousand-ton two-phase absorbent CO 2 capture device, the internal height of the phase separation tank 5 is designed according to 1.2 m. The absorbent is an organic solvent-based two-phase absorbent. After phase separation, the rich CO 2 aqueous phase is in the lower layer, that is, the lower phase 51 is the rich CO 2 aqueous phase; the lean CO 2 organic phase is in the upper layer, that is, the upper phase 52 is the lean CO 2 organic phase; the absorbent also has a phase separation interface 53 and a top interface 54; the upper and lower phase ratios of the absorbent in the laboratory test are 54%:46%. The specific monitoring and regulation steps are as follows:

[0059] Fix the probe sleeve 1 vertically in the phase separation tank 5. A plurality of hollow cross tubes 11 are connected to the tube wall of the probe sleeve 1. Place the probe 2 and the probe connection line 3 into the probe sleeve 1. According to the internal depth of the phase separation tank 5, control the detection and analysis module 42 in the analysis device 4 to send a control signal through the signal line 43, so that the control motor in the retraction and release module 41 rotates in reverse, lower the probe 2 to the bottom of the phase separation tank 5, and correct the zero position. At this time, the height of the position where the probe is located is 0.00 m. Then control the control motor in the retraction and release module 41 to rotate forward, and the probe 2 rises. During the rising process of the probe 2, the conductivity of the solution is measured synchronously until the probe 2 rises to a height of 1 m. The position height signal of the probe 2 generated by the rotation of the control motor and the conductivity signal measured by the probe 2 are transmitted to the detection and analysis module 42, forming a coordinate curve with the conductivity data measured by the probe 2 as the X-axis and the probe position data as the Y-axis. For details, please refer to Figure 2 , and the probe position data when the conductivity data changes sharply is the height of the phase separation interface. In this example, the measured height of the phase separation interface is 0.63 m.

[0060] During the operation of the carbon capture device, adopt a mixed monitoring mode. After the absorbent phase separation operates stably, place the probe 2 at a position with a height of 0.4 m, 0.23 m away from the phase separation interface 53, and monitor the conductivity at this position in real time. When the conductivity is larger than the normal phase separation range, automatically complete a detection of the solution up and down, confirm that the phase separation interface 53 has moved up, reduce the feed of the phase separation tank and the lean CO 2 Extract the organic phase to keep the phase separation interface 53 at a position near the middle of the phase separation tank 5.

[0061] Example 3

[0062] Adopt the detection device as Figure 1 shown to monitor and control the phase separation of the two-phase absorbent in the phase separation tank. For a thousand-ton two-phase absorbent CO 2 capture device, the internal height of the phase separation tank 5 is designed according to 1.2 m, the absorbent is an organic solvent-based two-phase absorbent, and after phase separation, the rich CO 2 aqueous phase is on the upper layer, that is, the upper phase 52 is the rich CO 2 aqueous phase; the lean CO 2 organic phase is on the lower layer, that is, the lower phase 51 is the lean CO 2 organic phase; the absorbent also has a phase separation interface 53 and a top interface 54; the upper and lower layer phase separation ratios of the absorbent in laboratory tests are 59%:41%. The specific steps for monitoring and control are as follows:

[0063] Fix the probe sleeve 1 vertically in the phase separation tank 5. A plurality of hollow horizontal tubes 11 are connected to the tube wall of the probe sleeve 1. Place the probe 2 and the probe connection line 3 into the probe sleeve 1. According to the internal depth of the phase separation tank 5, control the detection and analysis module 42 in the analysis device 4 to send a control signal through the signal line 43, so that the control motor in the retraction and release module 41 rotates in reverse, lower the probe 2 to the bottom of the phase separation tank 5, and correct the zero position. At this time, the height of the position where the probe is located is 0.00 m. Then control the control motor in the retraction and release module 41 to rotate forward, and the probe 2 rises. During the rising process of the probe 2, the conductivity of the solution is measured synchronously until the probe 2 rises to a height of 1 m. The position height signal of the probe 2 generated by the rotation of the control motor and the conductivity signal measured by the probe 2 are transmitted to the detection and analysis module 42, forming a coordinate curve with the conductivity data measured by the probe 2 as the X-axis and the probe position data as the Y-axis. For details, please refer to Figure 2 , the probe position data when the conductivity data changes sharply is the height of the phase separation interface. In this example, the measured height of the phase separation interface is 0.51 m.

[0064] During the operation of the carbon capture device, adopt a mixed monitoring mode. After the absorbent phase separation operates stably, place the probe 2 at a position with a height of 0.7 m, 0.19 m away from the phase separation interface 53, and monitor the conductivity at this position in real time. When the conductivity is smaller than the normal phase separation range, automatically complete a detection of the solution up and down, confirm that the phase separation interface 53 has not moved, indicating that the CO 2 content in the aqueous phase is decreasing, that is, the CO 2 loading captured by the absorbent is decreasing. Adjust the gas-liquid ratio of the absorption tower to increase the CO 2 loading of the absorbent. 2

[0065] Comparative Example 1

[0066] Adopt the detection device as shown in Figure 1 to monitor and regulate the phase separation of the two-phase absorbent in the phase separation tank. For a thousand-ton two-phase absorbent CO 2 capture device, the internal height of the phase separation tank 5 is designed according to 1.2 m, the absorbent is an organic solvent-based two-phase absorbent. After phase separation, the CO-rich 2 aqueous phase is in the lower layer, that is, the lower phase 51 is the CO-rich 2 aqueous phase; the CO-lean 2 organic phase is in the upper layer, that is, the upper phase 52 is the CO-lean 2 organic phase; the absorbent also has a phase separation interface 53 and a top interface 54; the upper and lower phase ratios of the absorbent in laboratory tests are 54%:46%. The specific monitoring and regulation steps are as follows:

[0067] Put the probe 2 into the phase separation tank 5. According to the internal depth of the phase separation tank 5, control the detection and analysis module 42 in the analysis device 4 to send a control signal through the signal line 43, so that the control motor in the retraction and release module 41 reverses, lower the probe 2 to the bottom of the phase separation tank 5, and correct the zero position. At this time, the height of the position where the probe is located is 0.00 meters. When the phase separation tank 5 is actually working, due to the continuous flow of the liquid in the phase separation tank 5, affected by the acting force of the solution flow, the probe 2 and the probe connection line 3 deviate from the vertical line of the horizontal plane of the phase separation tank 5, forming a certain deflection angle. The 0.00-meter position feedback by the signal is not the 0.00-meter position at the bottom of the phase separation tank, resulting in a smaller measured value of the phase separation interface height. The faster the liquid flow rate in the phase separation tank, the greater the deviation degree. In this example, the measured phase separation interface height is 0.58 meters, deviating by 7.9% compared with 0.63 meters with the casing installed.

[0068] It can be seen that in Comparative Example 1, no probe casing is provided, and in a phase separation tank with the liquid in a flowing state, the detection accuracy of the phase separation interface is greatly reduced, and it is difficult to provide accurate guidance for the phase separation behavior based on the measured phase separation interface.

[0069] In summary, through the design of the probe casing, the present invention enables the probe to move up and down in the probe casing, avoiding the deviation of the probe in the phase separation liquid, making the measured probe height more accurate. In addition, it also avoids the disturbance of the phase separation liquid caused by the up and down movement of the probe, resulting in the intermixing of the upper and lower layers of the phase separation liquid, making the detection result more accurate. Through the cooperation of the probe and the probe casing, an accurate sensing signal can be obtained, and then the control analysis device is used to analyze the sensing signal, so that the phase separation situation of the phase separation liquid can be obtained efficiently, simply and accurately. Moreover, the detection device has a simple structure and low production cost, is suitable for large-scale promotion, and has a good monitoring and control effect on the carbon capture operation process in particular.

Claims

1. A device for detecting phase separation in a phase separation liquid, characterized in that: It includes a probe sleeve, a probe, a probe connecting line and a control and analysis device; The probe sleeve is vertically fixed in the phase separation liquid; the tube wall of the probe sleeve is connected with a plurality of hollow transverse tubes; The probe is placed inside the probe sleeve; the probe is provided with a sensor; The probe connecting line is used to connect the probe and the control and analysis device, and transmit the signal detected by the probe to the control and analysis device; The control and analysis device is used to control the movement of the probe, and receive and analyze the signal detected by the probe, so as to obtain the phase separation situation.

2. The detection device according to claim 1, characterized in that: The control and analysis device comprises a connected retractable module and a detection and analysis module; the retractable module is connected to the detection and analysis module via the probe connecting line; the retractable module is used to control the movement of the probe; the detection and analysis module is used to receive and analyze the signal detected by the probe.

3. The detection device according to claim 2, characterized in that: The retractable module includes a connected recovery chamber and a control motor; the recovery chamber is used to accommodate the probe connecting line; the control motor is connected to the detection and analysis module through a signal line; the detection and analysis module controls the control motor through the signal line to realize the retraction and extension of the probe connecting line and drive the movement of the probe.

4. The detection device according to claim 1, characterized in that: The sensor is a conductivity sensor; the signal is conductivity; And / or, the phase separation liquid is a mobile phase separation liquid or a static phase separation liquid.

5. The detection device according to claim 1, characterized in that: The inner diameter of the probe sleeve is R; the inner diameter of the hollow transverse tube is ≤R; and the distribution spacing of the hollow transverse tubes on the wall of the probe sleeve is ≤2R.

6. A method for detecting phase separation in a phase separation liquid, characterized in that: The method is performed by the detection device according to any one of claims 1 to 5, and includes the following steps: adjusting the control and analysis device so that the probe is lowered to the bottom of the phase-separated liquid and set as the zero position; adjusting the control and analysis device so that the probe moves up and down in the probe sleeve, and recording the height of the probe relative to the zero position; in the process of the probe moving up and down, obtaining a sensor signal through the sensor of the probe, and transmitting the sensor signal to the control and analysis device through the probe connecting line; using the control and analysis device to analyze the sensor signal, obtain a relationship diagram between the sensor signal and the probe height, thereby obtaining the phase separation condition of the phase-separated liquid.

7. The detection method according to claim 6, characterized in that: The phase separation condition of the phase separation liquid includes the phase separation state of the phase separation liquid and / or the position of the phase separation interface after the phase separation liquid is phase-separated; the phase separation interface after the phase separation liquid is phase-separated is located at the position of the probe when the sensor signal jumps; And / or, the time required for the probe to rise from the bottom of the phase separation liquid to the top of the phase separation liquid is t, and t≤10s.

8. A method for monitoring and controlling a carbon capture operation process, characterized in that: The process is performed by a detection device as described in any one of claims 1 to 5, or by a detection method as described in claim 6 or 7, and includes the following steps: monitoring the phase separation of the two-phase absorbent during the carbon capture operation by means of the detection device or the detection method, and regulating the carbon capture operation based on the monitored conditions.

9. The monitoring and control method according to claim 8, characterized in that: The monitoring method includes a continuous monitoring mode, a mixed monitoring mode or a combination thereof: The continuous monitoring mode is: during the carbon capture operation, the probe is controlled to move up and down periodically in the two-phase absorbent to obtain a relationship diagram between the sensor signal and the probe height at different times, thereby obtaining the phase separation of the two-phase absorbent at different times; The mixed monitoring mode is as follows: during the carbon capture operation, when there is a phase separation interface in the two-phase absorbent, the probe is controlled to be fixed on one side of the phase separation interface in the two-phase absorbent, and the sensor signal at this position is monitored in real time. When the sensor signal at this position changes, the probe is adjusted to move up and down once to obtain a relationship diagram between the sensor signal and the probe height at this time, thereby obtaining the phase separation interface of the two-phase absorbent each time the sensor signal changes.

10. The monitoring and control method according to claim 9, characterized in that: The method of regulating the carbon capture operation process based on the monitoring situation includes: when the monitoring situation shows that a phase interface exists in the two-phase absorbent and the phase interface shifts, the phase interface is adjusted by adjusting the CO2 load of the two-phase absorbent and / or the upper and lower phase volumes of the two-phase absorbent; when the monitoring situation shows that a phase interface exists in the two-phase absorbent and the phase interface does not shift, but the sensor signal on one side of the phase interface changes, the sensor signal is adjusted by adjusting the CO2 load of the two-phase absorbent; when the monitoring situation shows that a phase interface exists in the two-phase absorbent and the phase interface does not shift, and the sensor signal on one side of the phase interface does not change, no regulation is performed.

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