A level gauge for carbon capture two-phase absorbent phase interface detection

Abstract

The utility model discloses a liquid level meter for carbon capture two -phase absorbent phase interface detection, including the gas collection disc, inside hollow, for storing the gas collection tank of separating out in carbon capture process, set up in the lower surface of gas collection disc, inside hollow, for storing the rich liquid of separating out in carbon capture process, interface detection pipe, through the gas collection disc with the collection tank, its inside is equipped with swing inhibitor, swing inhibitor includes: the centering rod, and inserts in interface detection pipe, the limit disc, is sleeved on the centering rod, the centering rod in swing inhibitor, limit disc, telescopic support arm, four -stage mechanical constraint of guide ball, can eliminate the horizontal shaking caused by the airflow in tower, rich liquid pump start -stop and unit load fluctuation, ensure that interface detection pipe always moves along the vertical direction linearly, and control module according to interface sensor real -time signal, drive phase state adjusting pump between gas collection disc and collection tank low -flow transfer gas, and the response time of traditional regulation rich liquid pump displacement is shortened compared to.

Description

Technical Field

[0001] This utility model specifically relates to a level gauge for detecting the phase separation interface of a carbon capture two-phase absorbent. Background Technology

[0002] With the increasing urgency of global carbon emission reduction, chemical absorption has become one of the core technological pathways for large-scale carbon capture from high-concentration CO2 emission sources such as coal-fired power plants and cement kilns. Among these, carbon capture processes based on two-phase absorbents (such as amine-water systems) have received widespread attention in recent years due to their advantages such as low regeneration energy consumption, small circulating load, and high CO2 selectivity. This process utilizes the absorbent to contact flue gas counter-currently within the absorption tower. CO2 undergoes a reversible chemical reaction with amines to generate a rich solution; this rich solution then enters a regeneration tower, where CO2 is desorbed by heating, forming a lean solution for recycling. During this process, a gas-liquid two-phase stratification interface, or phase separation interface, naturally forms at the bottom of the absorption tower. The stable height of this phase separation interface directly determines the gas-liquid contact time, amine circulation volume, and CO2 capture efficiency within the absorption tower. If the interface is too high, amine may be entrained in downstream equipment; if the interface is too low, gas short-circuiting may occur, reducing the capture rate. Therefore, real-time, accurate detection and dynamic adjustment of the phase separation interface are crucial for ensuring the long-term stable operation of the two-phase absorbent carbon capture system.

[0003] However, existing liquid level detection methods used for conventional single-phase absorbents show significant shortcomings when dealing with two-phase absorbents. Existing liquid level detection technologies generally suffer from common defects such as "inaccuracy, easy failure, difficulty in maintenance, and lack of adjustment" in carbon capture scenarios using two-phase absorbents, which has become one of the bottlenecks restricting the large-scale industrial promotion of this type of low-carbon process. Utility Model Content

[0004] The purpose of this invention is to provide a level gauge for detecting the phase separation interface of a carbon capture two-phase absorbent, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a level gauge for detecting the phase separation interface of a carbon capture two-phase absorbent, comprising: The gas collection plate is hollow inside and is used to store the gas separated during the carbon capture process; A liquid collection tank is located on the lower surface of the gas collection plate. It is hollow inside and is used to store the rich liquid separated during the carbon capture process. An interface detection tube penetrates the gas collecting plate and the liquid collecting tank, and a sway suppressor is installed inside it. The sway suppressor includes: The centering rod is inserted into the interface detection tube; The limit plate is fitted onto the centering rod; The telescopic support arm is hinged at equal intervals around the outer side of the limiting plate. A guide ball is provided at the end away from the limiting plate. The guide ball abuts against the inner side of the interface detection tube, so that the interface detection tube moves only in the vertical direction.

[0006] Preferably, it also includes an interface sensor and a control module. The interface sensor is disposed in the liquid collection tank and is used to detect the rich liquid level and output the interface position signal. The control module is disposed in the gas collection plate and is electrically connected to the interface sensor, and is used to receive and process the interface position signal.

[0007] Preferably, it also includes a phase adjustment pump, which is connected to the gas collecting plate and the liquid collecting tank respectively, and is controlled by the control module. It transports gas between the gas collecting plate and the liquid collecting tank according to the interface position signal to adjust the height of the phase separation interface.

[0008] Preferably, the lower surface of the liquid collection tank is provided with a rich liquid discharge bend, which is a horizontal bend structure.

[0009] Preferably, the telescopic support arm is a scissor structure, and its unfolding angle is adaptively adjusted according to the vertical displacement of the interface detection tube.

[0010] Preferably, the guide balls are made of polytetrafluoroethylene (PTFE).

[0011] The technical effects and advantages of this utility model are as follows: The level gauge for detecting the phase interface of the two-phase absorbent in carbon capture utilizes a four-stage mechanical constraint system consisting of a centering rod, a limiting plate, a telescopic support arm, and guide balls in its sway suppressor. This eliminates horizontal swaying caused by airflow within the tower, the start-up and shutdown of the rich liquid pump, and fluctuations in unit load, ensuring that the interface detection tube always moves linearly in the vertical direction. Based on the real-time signal from the interface sensor, the control module drives the phase adjustment pump to transfer gas at a small flow rate (rated flow rate is only 0.5–1% of the rich liquid circulation volume) between the gas collecting plate and the liquid collecting tank. This shortens the response time compared to traditional methods of adjusting the rich liquid pump discharge, solves the problem of inaccurate measurement of the two-phase absorbent interface, and achieves rapid adjustment through a micro-gas transfer strategy. It also boasts advantages such as high reliability, low energy consumption, and maintenance-free operation, providing a practical and feasible integrated solution for level detection and regulation for the long-term, high-load, and flexible operation of carbon capture devices. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the internal structure of the liquid collection tank of this utility model; Figure 3 This is a schematic diagram of the phase-conditioning pump of this utility model; Figure 4 This is a schematic diagram of the centering rod of this utility model; Figure 5This is a schematic diagram of the swing suppressor of this utility model.

[0013] In the diagram: 1. Gas collecting plate; 2. Liquid collecting tank; 3. Interface detection tube; 4. Centering rod; 5. Limiting plate; 6. Telescopic support arm; 7. Guide ball; 8. Interface sensor; 9. Rich liquid discharge bend; 10. Phase adjustment pump. Detailed Implementation

[0014] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0015] refer to Figure 1 , Figure 2 and Figure 3 As shown, the system includes a gas collecting plate 1, which is hollow inside and used to store the gas separated during the carbon capture process; a liquid collecting tank 2, which is located on the lower surface of the gas collecting plate 1 and is hollow inside, used to store the rich liquid separated during the carbon capture process; an interface detection tube 3, which passes through the gas collecting plate 1 and the liquid collecting tank 2, and has a swing suppressor inside. The swing suppressor includes: a centering rod 4, which is inserted into the interface detection tube 3; a limiting plate 5, which is sleeved on the centering rod 4; and a telescopic support arm 6, which is hinged at equal intervals around the outer side of the limiting plate 5, and has a guide roller at the end away from the limiting plate 5. The guide ball 7 abuts against the inner side of the interface detection tube 3, causing the interface detection tube 3 to move only in the vertical direction. The four-level mechanical constraints of the centering rod 4, limiting plate 5, telescopic support arm 6, and guide ball 7 in the sway suppressor can eliminate the horizontal swaying caused by airflow in the tower, the start and stop of the rich liquid pump, and the unit load fluctuation, ensuring that the interface detection tube 3 always moves linearly in the vertical direction. According to the real-time signal of the interface sensor 8, the control module drives the phase adjustment pump 10 to transfer gas between the gas collecting plate 1 and the liquid collecting tank 2 at a small flow rate (the rated flow rate is only 0.5-1% of the rich liquid circulation volume). This shortens the response time compared with the traditional rich liquid pump discharge adjustment, solves the problem of inaccurate measurement of the two-phase absorbent interface, and achieves fast adjustment with a micro gas transfer strategy. It also has the advantages of high reliability, low energy consumption, and maintenance-free operation, providing a practical and feasible integrated solution for liquid level detection and adjustment for long-cycle, high-load, and flexible operation of carbon capture devices.

[0016] refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, the system also includes an interface sensor 8 and a control module. The interface sensor 8 is located inside the liquid collection tank 2 and is used to detect the rich liquid level and output an interface position signal. The control module is located inside the gas collection plate 1 and is electrically connected to the interface sensor 8. It is used to receive and process the interface position signal. The interface sensor 8 is a pollution-resistant guided wave radar level gauge. Its probe is sealed with perfluoroether rubber and is connected to the control module via a Hastelloy cable. The control module has a built-in fuzzy-PID hybrid control algorithm, which is used to dynamically adjust the gas flow rate of the phase state regulating pump 10 according to the rate of change of the rich liquid level detected by the interface sensor 8, so as to maintain the phase separation interface stable within a set height range. The system also includes a phase state regulating pump 10, which is connected to both the gas collection plate 1 and the liquid collection tank 2. Controlled by the control module, the pump 10 delivers gas between the gas collection plate 1 and the liquid collection tank 2 according to the interface position signal to adjust the height of the phase separation interface. The phase-conditioning pump 10 is connected to the gas collecting plate 1 and the liquid collecting tank 2 via pipelines equipped with corrosion-resistant one-way valves. The valve cores of these valves are made of perfluoroether rubber to prevent CO2 gas backflow from causing interface fluctuations. The lower surface of the liquid collecting tank 2 is equipped with a rich liquid discharge bend 9, which is a horizontal bend structure used to continuously discharge rich liquid and maintain a liquid seal. The telescopic support arm 6 is a scissor structure, whose deployment angle adaptively adjusts with the vertical displacement of the interface detection tube 3, and its surface is coated with an oleophobic coating. The guide balls 7 are made of polytetrafluoroethylene (PTFE) and have a micro-arc oxidation ceramic layer on their surface to enhance wear resistance in amine-containing solution environments.

[0017] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model.

Claims

1. A level gauge for detecting the phase separation interface of a carbon capture two-phase absorbent, characterized in that, include: The gas collection plate (1) is hollow inside and is used to store the gas separated during the carbon capture process; The liquid collection tank (2) is located on the lower surface of the gas collection plate (1), and is hollow inside, for storing the rich liquid separated during the carbon capture process; An interface detection tube (3) penetrates the gas collecting plate (1) and the liquid collecting tank (2), and is equipped with a sway suppressor inside. The sway suppressor includes: Centering rod (4) is inserted into interface detection tube (3); The limiting plate (5) is fitted onto the centering rod (4); The telescopic support arm (6) is hinged at equal intervals around the outer side of the limiting disk (5). A guide ball (7) is provided at the end away from the limiting disk (5). The guide ball (7) abuts against the inner side of the interface detection tube (3), so that the interface detection tube (3) moves only in the vertical direction.

2. The level gauge for detecting the phase separation interface of a carbon capture two-phase absorbent according to claim 1, characterized in that: It also includes an interface sensor (8) and a control module. The interface sensor (8) is located in the liquid collection tank (2) and is used to detect the rich liquid level and output the interface position signal. The control module is located in the gas collection plate (1) and is electrically connected to the interface sensor (8) and is used to receive and process the interface position signal.

3. The level gauge for detecting the phase separation interface of a carbon capture two-phase absorbent according to claim 1, characterized in that: It also includes a phase adjustment pump (10), which is connected to the gas collecting plate (1) and the liquid collecting tank (2) respectively. It is controlled by the control module and delivers gas between the gas collecting plate (1) and the liquid collecting tank (2) according to the interface position signal to adjust the phase separation interface height.

4. The level gauge for detecting the phase separation interface of a carbon capture two-phase absorbent according to claim 1, characterized in that: The lower surface of the liquid collection tank (2) is provided with a rich liquid discharge bend (9), which is a horizontal bend structure.

5. The level gauge for detecting the phase separation interface of a carbon capture two-phase absorbent according to claim 1, characterized in that: The telescopic support arm (6) is a scissor structure, and its unfolding angle is adaptively adjusted according to the vertical displacement of the interface detection tube (3).

6. The level gauge for detecting the phase separation interface of a carbon capture two-phase absorbent according to claim 5, characterized in that: The guide ball (7) is made of polytetrafluoroethylene.

Images