Two-phase absorbent phase separation device based on viscosity differential rheological induction and microbubble flotation

Abstract

The utility model relates to two -phase absorbent phase -separation device based on viscosity difference rheological induction and micro -bubble flotation, including absorbent entrance, buffer area, pre -phase separation area, phase -separation area, rectifier orifice plate and separation area in proper order along the fluid flow direction. The buffer area is equipped with steady flow pre -phase separation board, and the narrow slit flow channel is formed between the adjacent board, the liquid inlet area of buffer area is equipped with micro -bubble air distributor, and absorbent entrance is located between micro -bubble air distributor and narrow slit flow channel, the phase -separation area is equipped with phase -separation reinforced guide baffle, the rectifier orifice plate covers the whole cross section of phase -separation device, the separation area is equipped with T overflow baffle, and the separation area is divided into upper part lean phase overflow area and lower part rich phase subsidence area, and is equipped with lean phase export and rich phase export. The utility model realizes the in -situ rapid phase -separation of two -phase absorbent through the synergies of narrow slit rheological effect and micro -bubble flotation, has the advantages such as high phase -separation efficiency, compact equipment, low energy consumption, strong robustness under variable conditions etc.

Description

Technical Field

[0001] This utility model belongs to the field of industrial gas purification, specifically relating to a two-phase absorbent phase separation device based on viscosity difference rheology induction and microbubble flotation. Background Technology

[0002] With the increasing urgency of carbon emission reduction in the steel industry, integrated desulfurization and decarbonization technology for blast furnace gas has become a research hotspot. Among them, the two-phase absorbent in the chemical absorption method has attracted much attention due to its unique phase change characteristics: after absorbing CO2, the absorbent spontaneously separates into a rich phase (heavy phase) and a poor phase (light phase). Only the rich phase needs to be regenerated to significantly reduce desorption energy consumption, which has energy-saving advantages.

[0003] In existing two-phase absorbent phase separation processes, conventional phase separators generally employ the principle of gravity sedimentation. Specifically, this involves creating a large buffer space within the equipment or filling the separation region with inclined (corrugated) packing to increase the coalescence area, thereby achieving the separation of the light and heavy phases. While this traditional approach is structurally simple, it often requires a long residence time and a large equipment volume to achieve the desired phase separation effect, resulting in a large footprint and high investment costs. Furthermore, for specific absorbent systems with small density differences and significant viscosity differences between the two phases, the phase separation efficiency of simple inclined plates or gravity sedimentation has certain limitations.

[0004] To address the aforementioned issues, several improvements have been proposed. For example, patent application CN120189732A discloses a phase separation device that uses a hydrocyclone for pre-separation and combines an angle-adjustable phase separation enhancement plate with a hydrophilic-hydrophobic coating to promote phase separation. This solution shortens the phase separation path to some extent, but its swirling process relies on a high inlet velocity to generate sufficient centrifugal force, resulting in relatively high system pressure drop and operating energy consumption. Simultaneously, the strong shear force present in the swirling field may cause further droplet breakage or dispersion under certain operating conditions, thus hindering the subsequent coalescence and stratification process.

[0005] Another patent application, CN121288503A, discloses a liquid-liquid two-phase separator that achieves adaptive adjustment to varying load conditions by incorporating a liquid level detection component and an adjustable inlet pipe, outlet pipe, and guide plate mechanism. This solution improves the operational flexibility of the phase separator; however, its adjustment mechanism involves multiple moving parts and a complex control system, resulting in relatively high complexity in engineering implementation and maintenance. Furthermore, its separation mechanism is still primarily based on gravity settling driven by density difference.

[0006] In summary, there is still a need in the existing technology for a phase separation device that can achieve rapid, efficient, and stable liquid-liquid phase separation with low energy consumption and small size, and that is simple, reliable, and adaptable to changing operating conditions. Utility Model Content

[0007] The purpose of this invention is to provide a two-phase absorbent phase separation device based on viscosity difference rheology induction and microbubble flotation, so as to overcome the above-mentioned technical defects.

[0008] To solve the above-mentioned technical problems, this utility model provides a two-phase absorbent phase separation device based on viscosity difference rheology induction and microbubble flotation, which, along the fluid flow direction, sequentially includes: Absorbent inlet; A buffer zone, the inlet area of ​​which is connected to the absorbent inlet, is provided with a flow stabilizing pre-phase separation plate. Multiple flow stabilizing pre-phase separation plates are arranged at equal intervals to form multiple narrow slit channels for fluid passage between adjacent flow stabilizing pre-phase separation plates. The pre-phase separation region has its inlet connected to the outlet of the buffer zone; The phase separation zone has an inlet connected to the outlet of the pre-phase separation zone, and a phase separation enhancement guide baffle is provided in the phase separation zone. A rectifier orifice plate is disposed at the outlet of the phase separation zone. The rectifier orifice plate is arranged along the cross-sectional direction of the phase separation device, and the four edges of the rectifier orifice plate are sealed and fixed to the inner wall of the phase separation device to cover the entire cross-section of the phase separation device. The separation zone has its inlet connected to the outlet side of the rectifier orifice plate. An overflow baffle is provided in the separation zone, which divides the separation zone into an upper depleted phase overflow zone and a lower rich phase settling zone. The upper depleted phase overflow zone is provided with a depleted phase outlet, and the lower rich phase settling zone is provided with a rich phase outlet.

[0009] According to the two-phase absorbent phase separation device based on viscosity difference rheology induction and microbubble flotation, a microbubble diffuser is provided in the inlet area of ​​the buffer zone. The microbubble diffuser is located below the liquid inlet side of the narrow slit channel and is used to release micron-sized inert bubbles. The absorbent inlet is located between the microbubble diffuser and the narrow slit channel.

[0010] According to the two-phase absorbent phase separation device based on viscosity difference rheology induction and microbubble flotation, the narrow slit channel is sequentially configured with a corrugated section and a straight section along the fluid flow direction, and the outlet of the corrugated section is connected to the inlet of the straight section.

[0011] According to the two-phase absorbent phase separation device based on viscosity difference rheology induction and microbubble flotation, the surface of the steady flow pre-phase separation plate is coated with a hydrophilic coating or a hydrophobic coating.

[0012] According to the two-phase absorbent phase separation device based on viscosity difference rheology induction and microbubble flotation, a plurality of phase separation enhancement flow guide baffles are stacked in parallel and at equal intervals in the phase separation region, and each phase separation enhancement flow guide baffle is inclined.

[0013] According to the two-phase absorbent phase separation device based on viscosity difference rheology induction and microbubble flotation, the tilt angle of the phase separation enhancement guide baffle is adjustable so as to change its tilt angle according to the height of the two-phase interface.

[0014] According to the two-phase absorbent phase separation device based on viscosity difference rheology induction and microbubble flotation, the overflow baffle has a T-shaped cross section, including a vertically arranged first plate and a horizontally arranged second plate, with one side of the second plate vertically fixed to the middle of the first plate; The first plate is arranged parallel to the rectifier plate, and the two opposite side edges of the first plate are fixed to the inner wall of the phase separation device. A gap is left between the top edge and the bottom edge of the first plate and the inner wall of the phase separation device. The second plate is horizontal, and its two opposite side edges are fixedly connected to the middle of the first plate and the inner wall of the phase separation device, respectively. The overflow baffle divides the separation zone into an upper depleted phase overflow zone and a lower rich phase settling zone, and isolates the depleted phase outlet from the rich phase outlet.

[0015] According to the two-phase absorbent phase separation device based on viscosity difference rheology induction and microbubble flotation, the overflow baffle is a height-adjustable overflow baffle, and its height adjustment method is stepless adjustment or gear adjustment.

[0016] According to the two-phase absorbent phase separation device based on viscosity difference rheology induction and microbubble flotation, the rectifier plate has a regularly arranged array of channels.

[0017] The beneficial effects of this utility model are as follows: (1) The narrow-slit flow channel formed by the equally spaced pre-phase separation plates in the buffer zone utilizes the viscosity difference between the lean and rich phases to allow the low-viscosity lean phase to obtain a higher flow velocity in the narrow-slit flow channel, thereby accelerating its migration to the upper layer and shortening the settling time and space required to form an upper lean and lower rich concentration gradient distribution. At the same time, the microbubbles released by the microbubble distributor selectively adhere to the lean phase based on the surface tension difference, forming a bubble-lean phase complex. This not only reduces the apparent density of the lean phase and accelerates its floating, but also captures fine lean phase droplets and prevents them from being entrained by the rich phase. The combined effect of these two factors improves the phase separation efficiency and makes the phase separation device more compact.

[0018] (2) This invention utilizes the viscosity and surface tension differences of the fluids themselves to achieve separation, without relying on high flow rates to generate centrifugal force. The flow field shear is gentle, making it less likely to cause droplet breakage. The introduction of microbubbles only requires a low-pressure gas source, resulting in low energy consumption. The entire phase separation device has no mechanical rotating parts, ensuring reliable operation and low maintenance costs.

[0019] (3) The phase separation enhancement guide baffle in the phase separation zone has an adjustable tilt angle and can be dynamically adjusted according to the height of the two-phase interface; the overflow baffle in the separation zone has an adjustable height and can adapt to changes in operating conditions such as fluctuations in the throughput. Compared with the prior art that requires multiple moving parts and complex control systems, the adjustment structure of this utility model is simple, the response is direct, and the industrial reliability is high.

[0020] (4) The overflow baffle at the end of the separation zone has a T-shaped cross-section. Its vertical first plate and horizontal second plate divide the separation zone into an upper lean phase overflow zone and a lower rich phase settling zone, and isolate the lean phase outlet from the rich phase outlet, thus preventing the rich phase back-mixing and entrainment phenomenon caused by the outlet suction force. The height of the overflow baffle can be steplessly adjusted or adjusted by a set level, and its top can be dynamically maintained below the thickness of the lean phase liquid layer, ensuring the cleanliness of the lean phase outlet.

[0021] (5) The rectifier orifice plate covers the entire cross-section of the phase separation device, and the four edges are sealed and fixed to the inner wall of the phase separation device. When the fluid passes through, the regular orifice array eliminates local turbulence and stabilizes the flow field, ensuring that the fluid entering the separation zone undergoes gravity settling in a uniform, axisymmetric laminar flow state, which improves the stability of the separation process.

[0022] To make the above-mentioned contents of this utility model more obvious and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of a two-phase absorbent phase separation device based on viscosity difference rheology induction and microbubble flotation.

[0024] Explanation of reference numerals in the attached figures: 1. Absorbent inlet; 2. Buffer zone; 21. Flow stabilizing pre-phase separation plate; 211. Corrugated section; 212. Straight strip section; 22. Microbubble distributor; 3. Pre-phase separation region; 4. Phase separation zone; 41. Phase separation enhanced flow guide baffle; 5. Rectifier orifice plate; 6. Separation zone; 61. Phase separation interface; 62. Overflow baffle; 621. First plate; 622. Second plate; 7. Export of lean products; 8. Export of rich products. Detailed Implementation

[0025] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0026] It should be noted that, in this utility model, the upper, lower, left, and right in the figure are regarded as the upper, lower, left, and right of the two-phase absorbent phase separation device based on viscosity difference rheology induction and microbubble flotation described in this specification.

[0027] Exemplary embodiments of the present invention are now described with reference to the accompanying drawings. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided to fully and completely disclose the present invention and to fully convey its scope to those skilled in the art. The terminology used in the exemplary embodiments shown in the drawings is not intended to limit the present invention. In the drawings, the same units / elements are referred to by the same reference numerals.

[0028] Unless otherwise stated, the terms used herein (including technical terms) have their common meaning as understood by one of ordinary skill in the art. Furthermore, it is understood that terms defined in commonly used dictionaries should be understood to have a meaning consistent with the context of their relevant field, and not to be interpreted as having an idealized or overly formal meaning.

[0029] It should be noted that the lean phase (also known as the light phase) refers to the phase with lower density, lower viscosity, and lower surface tension in a two-phase absorbent, typically a CO2-poor organic phase or a light component. The rich phase (also known as the heavy phase) refers to the phase with higher density, higher viscosity, and higher surface tension in a two-phase absorbent, typically a CO2-rich aqueous phase or a heavy component. Microbubble flotation is a separation enhancement technology that utilizes micron-sized bubbles to preferentially adhere to the surface of hydrophobic or low-surface-tension droplets, accelerating their flotation by reducing their apparent density. Narrow-slit rheological effect refers to the fluid dynamics phenomenon where, when a non-Newtonian fluid or a high-viscosity fluid passes through a narrow slit, the viscosity difference causes a difference in the flow velocity of different components due to the pressure gradient of the slit. Laminar fluid refers to a two-phase fluid that, after being processed through a narrow-slit channel, has formed a concentration gradient distribution trend of upper lean phase and lower rich phase, with the upper layer dominated by the lean phase and the lower layer dominated by the rich phase, but the two phases are not yet completely separated.

[0030] In this embodiment, induction refers to utilizing the viscosity difference between the lean and rich phases in the two-phase absorbent. Under the constraint of a narrow slit channel, the low-viscosity lean phase achieves a higher flow velocity than the high-viscosity rich phase, thereby guiding the two phases to separate in an orderly manner along the flow direction. This provides initial conditions for subsequent natural stratification based on density difference. This induction process requires no external energy or mechanical stirring; it can be achieved solely through the rheological properties of the fluid itself and the channel structure, distinguishing this invention from traditional gravity settling.

[0031] Absorbent inlet 1 refers to the inlet of the two-phase absorbent.

[0032] This embodiment relates to a two-phase absorbent phase separation device based on viscosity difference rheology induction and microbubble flotation, hereinafter referred to as the phase separation device. Please refer to [link to relevant documentation]. Figure 1 Along the fluid flow direction, the phase separation device sequentially includes: absorbent inlet 1, buffer zone 2, pre-phase separation zone 3, phase separation zone 4, rectifier orifice plate 5, and separation zone 6.

[0033] The absorbent inlet 1 is located at the beginning of the phase separation device and is used to introduce the two-phase absorbent, which has been separated into a lean phase and a rich phase after absorbing CO2, into the interior of the phase separation device. The arrangement and diameter of the absorbent inlet 1 are designed according to the processing capacity of the phase separation device to ensure that the two-phase absorbent can smoothly enter the subsequent region at a suitable flow rate, avoid severe turbulence or jets at the inlet, and provide stable initial flow conditions for the subsequent phase separation process.

[0034] The inlet area of ​​buffer zone 2 is connected to absorbent inlet 1. Buffer zone 2 contains multiple flow-stabilizing pre-phase separation plates 21, arranged at equal intervals. The gaps between adjacent plates form multiple narrow slit channels for fluid passage. The main functions of buffer zone 2 are: first, to buffer and homogenize the flow velocity of the two-phase absorbent entering from absorbent inlet 1, preventing direct impact on downstream structures; and second, to utilize the constraint of the narrow slit channels to create a velocity difference driven by viscosity difference as the two-phase absorbent passes through them. Specifically, based on the characteristics of low viscosity in the lean phase and high viscosity in the rich phase, the low-viscosity lean phase responds faster in the narrow slit channels, preferentially obtaining a higher axial velocity to cross the narrow slit channels and tending to flow towards the upper layer of the channels. Conversely, the high-viscosity rich phase experiences greater flow resistance, responds more slowly, and struggles to follow the rapid flow of the lean phase, remaining stagnant in the lower layer of the narrow slit channels. Driven by this viscosity difference, the lean and rich phases form a significant velocity difference when flowing out of the narrow slit channel.

[0035] The inlet of the pre-phase separation zone 3 is connected to the outlet of the buffer zone 2. The pre-phase separation zone 3 is a cavity with a wider space than the buffer zone 2, and its function is to receive the two-phase absorbent flowing out from the narrow slit channel. In the pre-phase separation zone 3, the faster-flowing, lean phase gradually migrates to the upper layer of the pre-phase separation zone 3, while the slower-flowing, rich phase tends to settle to the lower layer. This creates a vertical concentration gradient pre-distribution in the pre-phase separation zone 3, with the upper layer enriched by the lean phase and the lower layer enriched by the rich phase, which facilitates subsequent gravity settling and shortens the time and distance required for settling.

[0036] The inlet of phase separation zone 4 is connected to the outlet of pre-phase separation zone 3. When the pre-phase separated layered fluid enters phase separation zone 4, it has basically formed a layered state with the upper layer dominated by the poor phase and the lower layer dominated by the rich phase. However, the interface between the two phases is still unstable. The upper poor phase may still contain a small amount of fine rich phase droplets, and the lower rich phase may still contain a small amount of fine poor phase droplets.

[0037] Phase separation zone 4 is equipped with a phase separation enhancement flow guiding baffle 41. The phase separation enhancement flow guiding baffle 41 is installed at an angle, and its function is twofold: firstly, by changing the fluid flow direction, it guides the upper lean phase to flow upwards along the upper surface of the baffle 41, and the lower rich phase to flow downwards along the lower surface of the baffle, avoiding mutual interference and back-mixing between the two phases; secondly, the phase separation enhancement flow guiding baffle 41 generates local disturbance to the fluid, promoting the collision and coalescence of fine rich phase droplets entrained in the lean phase and fine lean phase droplets entrained in the rich phase, merging them into larger droplets, thereby accelerating the separation of the two phases. Through the aforementioned flow guiding and coalescence effects, phase separation zone 4 improves the separation efficiency.

[0038] It should be noted that the phase separation enhancement flow guide baffle 41 is installed at an angle, with the inlet end lower and the outlet end higher, so that the poor phase flows upward along the upper surface of the phase separation enhancement flow guide baffle 41, while the rich phase impacts the lower surface of the phase separation enhancement flow guide baffle 41 under the action of gravity and coalesces, then slides down the lower surface and returns to the rich phase layer.

[0039] A rectifier orifice plate 5 is located at the outlet of the phase separation zone 4. The rectifier orifice plate 5 is arranged along the cross-sectional direction of the phase separation device, and its four edges are sealed and fixed to the inner wall of the phase separation device, thus covering the entire cross-section of the device. The rectifier orifice plate 5 has a regularly arranged array of channels. When the two-phase absorbent flows out of the phase separation zone 4 and passes through the rectifier orifice plate 5, the channels exert a throttling and homogenizing effect on the fluid: areas with higher flow velocities experience greater resistance, resulting in a decrease in velocity; areas with lower flow velocities are less affected by throttling. After being rectified by the rectifier orifice plate 5, the fluid velocity distribution tends to be uniform, local turbulence is eliminated, and the flow field profile becomes uniform and axisymmetric.

[0040] The inlet of separation zone 6 is connected to the outlet side of the orifice plate 5. An overflow baffle 62 is installed inside separation zone 6. The overflow baffle 62 divides separation zone 6 into an upper lean-phase overflow zone and a lower rich-phase settling zone. The upper lean-phase overflow zone has a lean-phase outlet 7, and the lower rich-phase settling zone has a rich-phase outlet 8. Separation zone 6 is an expanded settling space where the fluid velocity decreases upon entry. Under low-velocity laminar flow conditions, the lean and rich phases settle due to their density difference: the less dense lean phase gradually rises to the top of separation zone 6, forming an upper lean-phase layer; the more dense rich phase gradually sinks to the bottom of separation zone 6, forming a lower rich-phase layer. The upper lean phase passes over the top of the overflow baffle 62 and is discharged from the lean-phase outlet 7; the lower rich phase, blocked by the overflow baffle 62, cannot overflow from above and can only be discharged from the rich-phase outlet 8 at the bottom of separation zone 6. The height of the overflow baffle 62 can be steplessly adjusted or adjusted in gear according to the working conditions, so that its top is always lower than the thickness of the lean phase liquid layer. This ensures the smooth overflow of the lean phase while blocking the back mixing and entrainment of the rich phase, thus ensuring the purity of the lean phase outlet 7.

[0041] Through the sequential coordination of the above-mentioned regions, the phase separation device of this embodiment achieves rapid, efficient, and stable phase separation of the two-phase absorbent. It has the advantages of compact equipment, low energy consumption, and no mechanical rotating parts, and is particularly suitable for the phase separation treatment of two-phase absorbent in the blast furnace gas co-desulfurization and decarbonization process.

[0042] It should be noted that a microbubble distributor 22 is installed in the inlet area of ​​buffer zone 2. This microbubble distributor 22 is located below the liquid inlet side of the narrow slit channel and is used to release micron-sized inert bubbles, referred to as microbubbles, into the fluid. The released inert bubbles (such as nitrogen or purified blast furnace gas) do not chemically react with the two-phase absorbent, avoiding the introduction of side reactions or contamination of the two-phase absorbent. The purpose of arranging the microbubble distributor 22 below the liquid inlet side of the narrow slit channel, that is, before the two-phase absorbent enters the narrow slit channel, is to ensure that the released microbubbles are uniformly dispersed in the fluid before the two-phase absorbent enters the narrow slit channel, ensuring that the microbubbles can enter the narrow slit channel with the two-phase absorbent and participate in the selective adhesion and separation process throughout the narrow slit channel. If the microbubble distributor 22 is arranged inside the narrow slit channel or at the outlet, the contact time between the microbubbles and the two-phase absorbent will be shortened, and the adhesion efficiency will be reduced.

[0043] The absorbent inlet 1 is located between the microbubble distributor 22 and the narrow slit channel. Specifically, the absorbent inlet 1 is positioned downstream of the microbubble distributor 22 and upstream of the narrow slit channel. After entering through the absorbent inlet 1, the two-phase absorbent first flows through the area where the microbubble distributor 22 is located, contacting the microbubbles released from below, allowing the microbubbles to be fully mixed into the two-phase absorbent. Subsequently, the two-phase absorbent carrying the microbubbles enters the narrow slit channel. The purpose of this sequential arrangement is twofold: first, to ensure that the microbubbles are uniformly distributed in the two-phase absorbent before entering the narrow slit channel, avoiding the adhesion effect caused by local aggregation or uneven distribution of microbubbles at the entrance of the narrow slit channel; second, to utilize the relative positions between the absorbent inlet 1 and the microbubble distributor 22 to form a reasonable flow field distribution, allowing the two-phase absorbent to first complete the mixing with the microbubbles in the liquid inlet area before entering the narrow slit channel for viscosity difference-driven flow velocity separation and surface tension difference-driven selective adhesion, thereby achieving a combination of two enhancement mechanisms. If the absorbent inlet 1 is located upstream or downstream of the microbubble distributor 22, it may cause insufficient microbubble mixing or an unreasonable fluid flow path, affecting the phase separation efficiency.

[0044] Through the above arrangement, the microbubbles released by the microbubble distributor 22 are fully mixed with the two-phase absorbent entering from the absorbent inlet 1 in the liquid inlet region. Subsequently, the two-phase absorbent carrying the microbubbles enters the narrow slit channel. The above-mentioned selective adhesion and flotation process based on microbubbles is called microbubble flotation. In the narrow slit channel, based on the surface tension difference between the lean phase and the rich phase, microbubbles preferentially adhere to the surface of lean phase microclusters and the surface of fine lean phase droplets with lower surface tension, forming a bubble-lean phase complex. This bubble-lean phase complex can, on the one hand, reduce the apparent density of the lean phase and accelerate its upward migration in the narrow slit channel; on the other hand, the microbubbles have a capturing effect on the fine lean phase droplets generated during the flow in the narrow slit, enabling them to obtain sufficient upward driving force and preventing them from being entrained by the rich phase fluid. This process, together with the velocity separation based on viscosity difference in the narrow slit channel, provides conditions for the formation of the concentration gradient pre-distribution in the pre-phase separation zone 3, realizing the efficient pre-phase separation of the two-phase absorbent.

[0045] It should be noted that depleted phase microclusters refer to clusters of aggregates formed by the aggregation of multiple depleted phase droplets, which are larger than fine depleted phase droplets; fine depleted phase droplets refer to individual tiny droplets that are dispersed from the main depleted phase and are usually smaller in diameter. Both are dispersion forms of depleted phases.

[0046] This embodiment employs a dual active pre-phase separation mechanism combining viscosity difference narrow-slit flow and microbubble flotation. This pre-emptive phase separation process significantly reduces the time and space required for subsequent gravity settling, resulting in a more compact equipment structure—superior to existing technologies. Specifically, microbubble flotation exhibits highly efficient selective collection of fine, lean-phase droplets, mitigating the tendency for secondary emulsification caused by shearing or flow disturbances, thereby ensuring that the amount of lean-phase entrained in the rich-phase phase at the outlet remains at an extremely low level.

[0047] In some embodiments, please refer to Figure 1 The narrow slit channel is sequentially configured with a corrugated section 211 and a straight section 212 along the fluid flow direction, with the outlet of the corrugated section 211 connected to the inlet of the straight section 212. The corrugated structure of the corrugated section 211 causes periodic disturbances in the two-phase absorbent during flow, increasing the probability of contact and collision between the lean and rich phases, promoting the coalescence of lean phase microclusters and fine lean phase droplets, and enhancing the adhesion opportunity between microbubbles and lean phases. The straight section 212 has a uniform cross-section and a straight flow direction, which can stabilize the fluid flow state and create stable flow conditions for the pre-distribution of concentration gradient in the subsequent pre-phase separation zone 3.

[0048] The surface of the flow-stabilizing pre-phase separation plate 21 is coated with a hydrophilic or hydrophobic coating. The hydrophilic coating has an affinity for the rich phase (usually the aqueous phase), promoting the wetting, spreading, and coalescence of rich phase droplets on the wall surface, accelerating their growth and settling. The hydrophobic coating repels the rich phase, reducing wall fouling and clogging. The hydrophilic coating utilizes the wetting effect to preferentially coalesce rich phase droplets on the wall surface, accelerating their settling; the hydrophobic coating utilizes its low surface energy to reduce the adhesion of rich phase droplets to the wall surface, preventing channel blockage. Both methods contribute to improving phase separation efficiency.

[0049] Please continue reading. Figure 1 Multiple phase-separation enhanced flow-guiding baffles 41 are stacked within the phase-separation zone 4. These baffles are arranged parallel to each other at equal intervals, and each baffle is inclined relative to the horizontal or vertical direction. This parallel and equidistant stacking structure forms multiple inclined channels within the phase-separation zone 4. When the two phase absorbents flow through, they are evenly distributed into each channel, avoiding fluid deviation or short-circuiting and ensuring separation effect throughout the entire cross-section.

[0050] The tilt angle of each phase-separation enhancement guide baffle 41 is adjustable, allowing its tilt angle to dynamically change according to the actual position of the two-phase interface height. The two-phase interface height refers to the vertical distance between the boundary layer between the upper depleted phase and the lower rich phase within the phase-separation zone 4 and the reference plane. When the throughput increases or the proportion of depleted phase increases, causing the two-phase interface to rise, increasing the tilt angle of the phase-separation enhancement guide baffle 41 allows the lower end of the baffle 41 to be inserted deeper, guiding more depleted phase upwards. When the throughput decreases or the proportion of rich phase increases, causing the two-phase interface to fall, decreasing the tilt angle of the phase-separation enhancement guide baffle 41 prevents the baffle 41 from being over-inserted into the rich phase layer and entraining the rich phase to the upper layer. By simultaneously adjusting the inclination angle of multiple phase separation enhancement flow guide baffles 41, the lower end of the lowest phase separation enhancement flow guide baffle 41 is always located near the two-phase interface. On the one hand, this promotes the collision and aggregation of fine rich phase droplets entrained in the lean phase, which then sink; on the other hand, it promotes the collision and aggregation of fine lean phase droplets entrained in the rich phase, which then float. At the same time, it guides the lean phase to flow upward along the upper surface of the phase separation enhancement flow guide baffle 41 and the rich phase to flow downward along the lower surface of the phase separation enhancement flow guide baffle 41, thereby improving the phase separation purity and separation efficiency.

[0051] In conjunction with the foregoing, the height of the overflow baffle 62 can be steplessly adjusted or adjusted in stages according to the operating conditions. In this embodiment, only two parameters need to be adjusted: the tilt angle of the phase-splitting enhanced flow guide baffle 41 and the height of the overflow baffle 62, to adapt to load fluctuations. Compared to fully dynamic adjustment schemes that require multiple moving parts and complex control systems, the adjustment structure of this utility model is simple, the control logic is clear, and the industrial reliability and robustness are improved.

[0052] The introduction of the height-adjustable overflow baffle 62 solves the problem of rich phase being easily sucked up and entrained when the liquid level fluctuates in traditional fixed weir plates, thus ensuring the cleanliness of the lean phase outlet. Specifically: the overflow baffle 62 has a T-shaped cross-section, such as... Figure 1 As shown, it consists of a vertically arranged first plate 621 and a horizontally arranged second plate 622. One side of the second plate 622 is vertically fixed to the middle of the first plate 621, forming a T-shaped structure. This T-shaped design achieves the dual functions of overflow control and separation sealing within a limited space.

[0053] The first plate 621 is arranged parallel to the rectifier orifice plate 5, specifically, Figure 1 The diagram shows that the two sides of the first plate 621 in the width direction are fixed to the inner wall of the phase separation device. There are gaps between the top edge and the bottom edge of the first plate 621 and the inner wall of the phase separation device. The top gap is used to allow the upper depleted phase to overflow, while the bottom gap allows the lower rich phase to settle and flow, while avoiding the formation of dead zones.

[0054] The second plate 622 is horizontal, and its two opposite side edges are fixedly connected to the middle of the first plate 621 and the inner wall of the phase separation device, respectively. The horizontally arranged second plate 622 forms a transverse partition in the separation zone 6, thereby dividing the cross-section of the separation zone 6 into upper and lower parts, thus isolating the upper depleted phase overflow zone from the lower rich phase settling zone.

[0055] The overflow baffle 62, through the aforementioned structure, clearly divides the separation zone 6 into an upper lean phase overflow zone and a lower rich phase settling zone, while simultaneously isolating the lean phase outlet 7 and the rich phase outlet 8 from each other. During operation, the upper lean phase crosses the top gap of the first plate 621 into the upper overflow zone and is then discharged through the lean phase outlet 7; the lower rich phase, due to the obstruction of the first plate 621 and the second plate 622, cannot enter the upper zone and can only be discharged from the bottom rich phase outlet 8. This T-shaped overflow baffle structure prevents the rich phase from being sucked and carried to the lean phase outlet 7, ensuring the purity of the lean phase outlet 7.

[0056] In summary, the fluid flow process during operation of the phase separation device in this embodiment is as follows: After absorbing CO2, the two-phase absorbent, which separates into a lean phase and a rich phase, first enters the inlet region of the buffer zone 2 from the absorbent inlet 1. Within this inlet region, the two-phase absorbent mixes with micron-sized inert bubbles released by the microbubble distributor 22. The two-phase absorbent carrying the microbubbles then enters multiple narrow slit channels formed by the evenly spaced pre-separated flow plates 21. In these narrow slit channels, based on the viscosity difference between the lean and rich phases, the low-viscosity lean phase flows faster and tends to rise to the upper layer of the slit channel, while the high-viscosity rich phase flows slower. Simultaneously, based on the surface tension difference, the microbubbles preferentially adhere to the surface of lean phase microclusters and fine lean phase droplets, forming a bubble-lean phase complex. This bubble-lean phase complex carries the lean phase upwards. After the two-phase absorbent flows out of the narrow slit channel, it enters the pre-phase separation zone 3. In this zone, the flow velocity decreases, the lean phase continues to float and accumulate, and the rich phase continues to sink and concentrate. The two-phase interface is initially formed, thus forming a concentration gradient pre-distribution in the pre-phase separation zone 3, with the upper layer enriched by the lean phase and the lower layer enriched by the rich phase, so as to facilitate subsequent gravity sedimentation and shorten the time and distance required for sedimentation.

[0057] Subsequently, the fluid enters phase separation zone 4. Within phase separation zone 4, the phase separation enhancement guide baffle 41 guides the lean phase to flow upward and the rich phase to flow downward, while simultaneously promoting the collision and coalescence of fine rich phase droplets entrained in the lean phase and fine lean phase droplets entrained in the rich phase, further enhancing separation. After exiting phase separation zone 4, the fluid passes through the rectifier orifice plate 5. The rectifier orifice plate 5 uses a regular array of channels to eliminate local turbulence and perform secondary rectification of the fluid, ensuring that the flow field profile entering separation zone 6 is uniform and axisymmetric.

[0058] The conditioned fluid enters separation zone 6. Separation zone 6 is an expanded structure where the fluid velocity decreases. Under low-velocity laminar flow conditions, the lean phase and the rich phase settle due to density difference, forming a clear phase separation interface 61. The upper lean phase above the phase separation interface 61 crosses the gap at the top of the first plate 621 of the overflow baffle 62 and enters the upper lean phase overflow zone, eventually being discharged from the lean phase outlet 7. The lower rich phase below the phase separation interface 61 is blocked by the overflow baffle 62 and cannot enter the upper part, being discharged from the rich phase outlet 8 along the bottom. Throughout the operation, the inclination angle of the phase separation enhancement guide baffle 41 can be dynamically adjusted according to the height of the two-phase interface, and the height of the overflow baffle 62 can be steplessly or adjusted according to changes in operating conditions such as throughput fluctuations, ensuring that the top of the baffle is always lower than the thickness of the lean phase liquid layer, guaranteeing high purity of the lean phase outlet and preventing back mixing of the rich phase.

[0059] Thus, the two-phase absorbent has completed the entire process of pre-phase separation, enhanced separation, gravity sedimentation, and separate discharge, realizing efficient in-situ phase separation based on the synergy of viscosity difference narrow-slit rheology and microbubble flotation.

[0060] It should be noted that throughout the phase separation process, the two-phase absorbent maintains unidirectional flow driven by the feed pressure. The lean phase passes rapidly through the upper layer of the narrow slit channel, while the rich phase advances slowly in the lower layer. The inlet area is spacious, and the fluid always flows towards the narrow slit channel, eliminating local backflow or dead zones. Therefore, there is no accumulation of the rich phase or blockage of the absorbent inlet 1 or the microbubble distributor 22. The outlet of the microbubble distributor 22 uses a microporous structure, with gas pressure higher than liquid pressure, preventing liquid backflow. Continuous upstream feeding and continuous downstream discharging together maintain the material balance of the entire phase separation unit, ensuring its long-term stable operation.

[0061] Those skilled in the art will understand that the above embodiments are specific examples of implementing the present invention, and in practical applications, various changes can be made to them in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A two-phase absorbent phase separation device based on viscosity difference rheology-induced and microbubble flotation, characterized in that, Along the direction of fluid flow, it includes, in sequence: Absorbent inlet (1); The buffer zone (2) is connected to the absorbent inlet (1) and a flow stabilizing pre-phase separation plate (21) is provided in the buffer zone (2). Multiple flow stabilizing pre-phase separation plates (21) are arranged at equal intervals to form multiple narrow slit channels for fluid to pass through between adjacent flow stabilizing pre-phase separation plates (21). The pre-phase separation region (3) has its inlet connected to the outlet of the buffer zone (2); The phase separation zone (4) has its inlet connected to the outlet of the pre-phase separation zone (3), and a phase separation enhancement guide baffle (41) is provided in the phase separation zone (4). A rectifier orifice plate (5) is disposed at the outlet of the phase separation zone (4). The rectifier orifice plate (5) is arranged along the cross-sectional direction of the phase separation device, and the four edges of the rectifier orifice plate (5) are sealed and fixed to the inner wall of the phase separation device to cover the entire cross-section of the phase separation device. The separation zone (6) is connected to the outlet side of the rectifier orifice plate (5). An overflow baffle (62) is provided in the separation zone (6). The overflow baffle (62) divides the separation zone (6) into an upper depleted phase overflow zone and a lower rich phase settling zone. The upper depleted phase overflow zone is provided with a depleted phase outlet (7), and the lower rich phase settling zone is provided with a rich phase outlet (8).

2. The two-phase absorbent phase separation device based on viscosity difference rheology induction and microbubble flotation according to claim 1, characterized in that, The inlet area of ​​the buffer zone (2) is provided with a microbubble diffuser (22), which is located below the liquid inlet side of the narrow slit channel. The microbubble diffuser (22) is used to release micron-sized inert bubbles. The absorbent inlet (1) is located between the microbubble diffuser (22) and the narrow slit channel.

3. The two-phase absorbent phase separation device based on viscosity difference rheology induction and microbubble flotation according to claim 1, characterized in that, The narrow slit channel is configured with a corrugated section (211) and a straight section (212) in sequence along the fluid flow direction, and the outlet of the corrugated section (211) is connected to the inlet of the straight section (212).

4. The two-phase absorbent phase separation device based on viscosity difference rheology induction and microbubble flotation according to claim 1, characterized in that, The surface of the steady flow pre-phase separation plate (21) is coated with a hydrophilic coating or a hydrophobic coating.

5. The two-phase absorbent phase separation device based on viscosity difference rheology induction and microbubble flotation according to claim 1, characterized in that, Multiple phase-separation enhanced flow guide baffles (41) are stacked parallel to each other and at equal intervals in the phase-separation zone (4), and each phase-separation enhanced flow guide baffle (41) is inclined.

6. The two-phase absorbent phase separation device based on viscosity difference rheology induction and microbubble flotation according to claim 5, characterized in that, The tilt angle of the phase-separation enhanced flow guide baffle (41) is adjustable so that its tilt angle can be changed according to the height of the two-phase interface.

7. The two-phase absorbent phase separation device based on viscosity difference rheology induction and microbubble flotation according to claim 1, characterized in that, The overflow baffle (62) has a T-shaped cross section, including a vertically arranged first plate (621) and a horizontally arranged second plate (622), with one side of the second plate (622) vertically fixed to the middle of the first plate (621); The first plate (621) is arranged parallel to the rectifier plate (5), and the two opposite side edges of the first plate (621) are fixed to the inner wall of the phase separation device. There are gaps between the top edge and the bottom edge of the first plate (621) and the inner wall of the phase separation device. The second plate (622) is horizontal, and its two opposite side edges are fixedly connected to the middle of the first plate (621) and the inner wall of the phase separation device, respectively. The overflow baffle (62) divides the separation zone (6) into an upper depleted phase overflow zone and a lower rich phase settling zone, and isolates the depleted phase outlet (7) from the rich phase outlet (8).

8. The two-phase absorbent phase separation device based on viscosity difference rheology induction and microbubble flotation according to claim 1, characterized in that, The overflow baffle (62) is a height-adjustable overflow baffle, and its height adjustment method is stepless adjustment or gear adjustment.

9. The two-phase absorbent phase separation device based on viscosity difference rheology induction and microbubble flotation according to claim 1, characterized in that, The rectifier plate (5) has a regularly arranged array of holes.

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