High-efficiency dryer for storage and application based on liquid carbon dioxide trapping method

Abstract

The invention relates to an efficient dryer for storage and application based on a liquid carbon dioxide trapping method. The problems of radial saturation deviation and low-temperature bed stiffness caused by uneven flow velocity distribution of existing equipment are solved. The core structure comprises double drying cylinders, an adsorption bed body and a guide assembly. The guide assembly constructs an'inner expansion-outer shrinkage 'radial two-way hedging flow field, and the flow velocity gradient is eliminated; the adsorption bed body is combined with an elastic pressing and hanging structure, micro-amplitude oscillation is triggered by fluid impact, and particle interlocking and channeling are eliminated. During working, liquid carbon dioxide is subjected to bidirectional shunting homogenization and then is deeply dehydrated through the coarse and fine hole grading adsorbent, and the detection assembly monitors the dew point in real time. The problems of uneven radial adsorption and channeling memory effect are effectively solved, the dehydration dew point reaches the standard, the service life of the adsorbent is prolonged, and continuous and stable operation under high-pressure and low-temperature working conditions is guaranteed.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of dryers, and relates to a high-efficiency dryer based on liquid carbon dioxide capture method storage application. BACKGROUND

[0002] Under the promotion of the global "double carbon" goal, carbon capture, utilization and storage (CCUS) technology has become a core path to cope with climate change and achieve large-scale industrial emission reduction, and the capture and storage of liquid carbon dioxide (pressure 4-7 MPa, temperature about-56.6℃) is a key link of the CCUS system.

[0003] However, in the specific working condition of deep dehydration of liquid carbon dioxide, the existing technology faces non-typical fluid mechanics and thermodynamics challenges, mainly embodied in the following technical problems: Liquid carbon dioxide has the characteristics of high density (about 1.1 g / cm³) and low viscosity (about 0.12 cP), which makes its fluid distribution uneven when passing through a large-diameter adsorption bed. The existing axial straight-through type dryer cannot break through this fluid mechanics boundary layer, causing the adsorbent in the center area of the adsorption bed to be quickly saturated (adsorption breakthrough) due to "overcurrent", while the adsorbent in the edge area has not fully played a role (adsorption lag), which leads to a great imbalance in radial utilization, directly causing the effective working period of the dryer to be greatly shortened, and the local gasification (flash) phenomenon caused by the concentrated release of adsorption heat in the center area, further damaging the stability of the flow field.

[0004] Under the deep cooling high-pressure environment of-56.6℃, the metal container wall surface shrinkage and the cold brittle hardening of the adsorbent particles occur at the same time, which increases the friction coefficient between the adsorbent particles and forms the "particle interlocking" phenomenon, and the bed layer loses the self-adaptive settling ability (i.e. the bed layer is rigid). Once the fluid is scoured out of a small low-resistance channel (channeling) in the bed layer under high pressure impact, due to the rigid bed layer that cannot naturally collapse to fill these gaps through gravity, liquid carbon dioxide will tend to continuously short-circuit through these fixed paths (i.e. the memory of channeling), causing most of the adsorbent to be ineffective, resulting in serious non-compliance of dehydration precision. SUMMARY

[0005] The present application originates from the actual demand for liquid carbon dioxide dehydration treatment in the field of carbon capture, utilization and storage (CCUS) technology. In the CCUS system, the capture and storage of liquid carbon dioxide (pressure 4-7 MPa, temperature about -56.6℃) is a key link, but the water (free water and dissolved water) entrained in the capture process will freeze at high pressure and low temperature, causing blockage of the conveying pipeline, valve jamming, and generation of weak acidic substances to corrode the equipment. Through on-site investigation and data analysis of multiple CCUS enterprises, we found that the existing dryer axial flow channel design causes the "channeling" phenomenon, local adsorbent saturation and low overall utilization, non-optimized graded adsorption, and difficult to stabilize the dew point ≤-40℃. Frequent regeneration interrupts production, and the service life of the equipment is short. These problems cause the percentage of defective products to rise by 5-10%, and the loss during shutdown accounts for more than 3% of the total time.

[0006] The existing dryers are mostly for gas CO2 treatment, and there are few efficient designs for liquid CO2. Although the existing compression cooling drying is automatic, it ignores the high density and low viscosity characteristics of liquid CO2, resulting in uneven liquid distribution and insufficient deep dehydration. These limitations are emphasized in the investigation, for example, operators feedback that the existing equipment has a short regeneration cycle, affecting continuity.

[0007] To achieve the above purpose, the present application provides the following technical scheme: based on the liquid carbon dioxide capture method, an efficient dryer is applied for storage, comprising: A support seat is provided with a drying cylinder body I and a drying cylinder body II at the top; The top of the drying cylinder body I and the drying cylinder body II is connected to a three-way pipe fitting I through a three-way pipe fitting II, and the two ends of the three-way pipe fitting I are connected to one end of two three-way pipe fittings II through a valve I and a valve II, respectively; The bottom end of the drying cylinder body I and the drying cylinder body II is connected to a three-way pipe fitting IV through a three-way pipe fitting V, and the two ends of the three-way pipe fitting IV are connected to one end of two three-way pipe fittings V through a valve V and a valve VI, respectively; A fan is arranged at the top of the support seat, and the exhaust end of the fan is connected to a three-way pipe fitting III, and the other two ends of the three-way pipe fitting III are connected to the other end of two three-way pipe fittings II through a valve III and a valve IV, respectively, and the other end of two three-way pipe fittings V is connected to an exhaust pipe through a valve VII and a valve VIII, respectively; An adsorption bed body is arranged in the drying cylinder body I and the drying cylinder body II, a coarse pore type adsorbent and a fine pore type adsorbent are arranged in the adsorption bed body, the coarse pore type adsorbent is used for removing free water in liquid carbon dioxide, and the fine pore type adsorbent is used for deep removal of dissolved water; The guide assembly is arranged above the adsorption bed body in the drying cylinder I and the drying cylinder II, and comprises a flow guide rod body and a flow guide cover body.

[0008] As a further improvement of the above technical solution: The adsorption bed body is fixedly provided with a partition plate, which divides the adsorption bed body into a containing chamber I and a containing chamber II.

[0009] The outer wall of the flow guide rod body is fixedly provided with a plurality of spiral strip bodies.

[0010] The outer wall of the flow guide rod body is fixedly provided with a plurality of spiral strip bodies.

[0011] The guide assembly comprises a connecting shaft rod fixed to the top of the adsorption bed body.

[0012] The guide assembly comprises a connecting shaft rod fixed to the top of the adsorption bed body.

[0013] The inner wall of the connecting membrane piece arranged above is fixedly provided with a plurality of flow guide strips.

[0014] Further comprising a detection assembly, the detection assembly comprises a sampling valve connected to the three-way pipe V, the other end of the sampling valve is connected to a pressure relief valve, the other end of the pressure relief valve is connected to a dew point instrument through a connecting pipeline, and the dew point of the dried liquid carbon dioxide is monitored in real time based on the pressure release principle.

[0015] The coarse pore type adsorbent is coarse pore spherical silica gel, the pore size is 8-15 nm, and the specific surface area is 300-400 m² / g; The fine pore type adsorbent is 13X zeolite molecular sieve, the pore size is 0.8-1.0 nm, and the specific surface area is 700-800 m² / g, and deep dehydration is realized through fractional adsorption.

[0016] The drying cylinder I and the drying cylinder II realize the alternation of adsorption operation and regeneration operation based on valve switching, when the adsorbent in one drying cylinder is saturated, the other drying cylinder continues to dehydrate, so that the continuity of liquid carbon dioxide capture and storage is ensured.

[0017] The beneficial effects of the present application are: 1. The high-efficiency dryer based on liquid carbon dioxide capture method for storage disclosed in the present application, in view of the problem of uneven distribution of liquid carbon dioxide laminar flow velocity, a radial bidirectional opposite flow field mechanism is innovatively designed. The top of the adsorption bed is divided into two inner and outer regions by the flow guide cover body of the guide assembly, a part of the fluid is guided to diffuse "from inside to outside" by the spiral groove of the flow guide rod body, and another part of the fluid is guided to contract "from outside to inside" by the sliding column body and the flow guide cover. The two opposite flow directions of the fluids intersect radially and the vectors cancel out inside the adsorption bed layer, which forcibly breaks the original parabolic flow velocity distribution of the liquid carbon dioxide and eliminates the "radial saturation deviation" caused by the too fast central flow velocity. This uniform penetration mode on the whole cross section ensures that the adsorbent bed layer can reach adsorption balance at the same time whether it is in the center or the edge, and maximizes the effective utilization rate of the adsorbent and the processing capacity of a single cycle. 2. The high-efficiency dryer based on liquid carbon dioxide capture method for storage disclosed in the present application, in view of the "channeling memory effect" caused by the "rigidity" of the adsorption bed layer under cryogenic conditions, a dynamic self-repairing system is established. The kinetic energy of the fluid flow is converted into the micro-amplitude high-frequency oscillation of the adsorption bed body through the suspension buffer structure of spring II. This oscillation can generate shear waves, effectively breaking the "particle interlocking" state between adsorbent particles at low temperature, so that the bed layer maintains the "thixotropic" fluidization characteristics. Once a small gap or channeling tendency appears in the bed layer, the oscillation will cause the surrounding particles to displace rapidly to fill the gap, thereby completely eliminating the basis for the formation of channeling. In cooperation with the constant axial pressure provided by spring I, the adsorption bed layer always maintains a dense and uniform pore distribution throughout its life cycle, significantly prolonging the service life of the adsorbent and reducing the operation and maintenance cost. 3. The high-efficiency dryer for storing liquid carbon dioxide capture method application disclosed in the application adopts the double-cylinder structure design of the drying cylinder I and the drying cylinder II, can realize the alternation of adsorption operation and regeneration operation, when the adsorbent in one of the drying cylinders is saturated, the regeneration process can be started through valve switching, the other drying cylinder continuously carries out the dehydration operation, without interrupting the operation of the whole system, and the continuity of the liquid carbon dioxide capture and storage is ensured; 4. The high-efficiency dryer for storing liquid carbon dioxide capture method application disclosed in the application is provided with a detection assembly composed of a sampling valve, a pressure relief valve, a connecting pipeline and a dew point instrument, can realize the real-time monitoring of the dew point of the dried liquid carbon dioxide, can timely prompt the regeneration opportunity when the dew point reaches the set threshold (≥-35 DEG C), avoids the excessive adsorption of the adsorbent or the insufficient regeneration, and is accurate in operation and does not need frequent manual inspection.

[0018] Other advantages, objects, and features of the present application will be apparent to those skilled in the art from the following specification, in conjunction with the accompanying drawings. The objects and other advantages of the present application will be realized and attained by the structure particularly pointed out in the specification. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to make the objects, technical solutions and advantages of the present application clearer, the preferred detailed description of the present application will be made below in conjunction with the drawings, wherein: Figure 1 It is a three-dimensional structure schematic view of the high-efficiency dryer for storing liquid carbon dioxide capture method application based on the present application; Figure 2 It is a tee pipe V installation structure schematic view of the high-efficiency dryer for storing liquid carbon dioxide capture method application based on the present application; Figure 3 It is a drying cylinder cross-sectional structure schematic view of the high-efficiency dryer for storing liquid carbon dioxide capture method application based on the present application; Figure 4 It is a top view structure schematic view of the guide assembly of the high-efficiency dryer for storing liquid carbon dioxide capture method application based on the present application; Figure 5 It is a guide assembly and adsorption bed body connection structure schematic view of the high-efficiency dryer for storing liquid carbon dioxide capture method application based on the present application; Figure 6 It is a connecting membrane structure schematic view of the high-efficiency dryer for storing liquid carbon dioxide capture method application based on the present application; Figure 7 It is an adsorption bed body cross-sectional structure schematic view of the high-efficiency dryer for storing liquid carbon dioxide capture method application based on the present application; Figure 8 It is Figure 7Amplification structure schematic view of middle A part; Figure 9 The figure of the embodiment of the present application.

[0020] Fig. 1 is a support seat; 2 is a drying cylinder I; 3 is a drying cylinder II; 4 is a three-way pipe I; 5 is a three-way pipe II; 6 is a valve I; 7 is a valve II; 8 is a valve III; 9 is a valve IV; 10 is a fan; 11 is a three-way pipe III; 12 is a control cabinet; 13 is a three-way pipe IV; 14 is a valve V; 15 is a valve VI; 16 is a three-way pipe V; 17 is a valve VII; 18 is a valve VIII; 19 is an exhaust pipeline; 20 is a sampling valve; 21 is a pressure relief valve; 22 is a connecting pipeline; 23 is an adsorption bed; 231 is a connecting shaft; 232 is a partition plate; 233 is a containing cavity I; 234 is a containing cavity II; 235 is a fine-pore adsorbent; 236 is a coarse-pore adsorbent; 237 is a compression plate; 238 is a sliding column; 239 is a connecting cylinder; 240 is a spring I; 24 is a fixed ring; 25 is a spring II; 26 is a connecting diaphragm; 261 is a flow guide strip; 27 is a connecting lug; 28 is a guide assembly; 281 is a flow guide rod; 282 is a U-shaped connecting shaft; 283 is a flow guide cover; 284 is a spiral strip; 285 is a flow guide groove; 29 is an adsorption area I; 30 is an adsorption area II. DETAILED DESCRIPTION

[0021] The present application will be described in greater detail by way of specific embodiments, from which the skilled person will readily appreciate other advantages and embodiments of the present application. The present application can be put into practice in various ways and embodiments, and the details can be modified in different ways without departing from the spirit of the application. It should be noted that the drawings in the following examples only schematically illustrate the basic idea of the present application, and the features in the following examples and embodiments can be combined with each other without conflict.

[0022] The drawings are only used for illustrative purposes, and the representation is only a schematic diagram, not a physical diagram, and cannot be understood as a limitation of the present application; in order to better illustrate the embodiments of the present application, some components of the drawings may be omitted, enlarged or reduced, and do not represent the actual size of the product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0023] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0024] Example 1

[0025] like Figures 1-9 As shown, this high-efficiency dryer based on liquid carbon dioxide capture and storage is suitable for deep dehydration treatment during the liquid carbon dioxide capture and storage process. The core working principle is to achieve uniform distribution of liquid carbon dioxide through a guiding component, remove moisture by utilizing the graded adsorption characteristics of coarse-porous and fine-porous adsorbents, and ensure the stability of the adsorbent layer with an elastic compression structure. At the same time, the dehydration effect is monitored in real time through a detection component, and finally, dry liquid carbon dioxide with a dew point that meets the standard is output. It can effectively avoid water freezing and clogging of pipes or corrosion of equipment under low temperature and high pressure, and ensure the safety and purity of liquid carbon dioxide storage and transportation.

[0026] Support base 1 is integrally molded from stainless steel, with four rubber anti-slip pads fixed at the bottom to enhance the stability of the device during placement and prevent displacement due to vibration during operation. Drying cylinders I2 and II3 are both vertical cylindrical structures with identical specifications, welded from stainless steel, capable of withstanding the high pressure and low temperature conditions required for liquid carbon dioxide treatment. Their structural design follows the pressure-bearing principle of high-pressure vessels, using appropriate wall thickness and material selection to withstand the high-pressure impact of liquid carbon dioxide. Drying cylinders I2 and II3 are vertically fixed to the top of support base 1, and their bottoms are sealed to support base 1 via flanges. Sealing gaskets are used at the flange connections to ensure high-pressure sealing performance and prevent liquid carbon dioxide leakage.

[0027] Both drying cylinders I2 and II3 are fixedly connected to the top of a tee fitting II5 via flanges. A tee fitting I4 is installed between the two tee fittings II5. Both ends of tee fitting I4 are connected to the flanges at one end of each of the two tee fittings II5 via valves I6 and II7, respectively. Valve I6 and valve II7 are both high-pressure ball valves with stainless steel stems and high-pressure and corrosion-resistant sealing surfaces. Based on the on / off control principle of ball valves, the valve core is opened and closed by rotating the valve stem, enabling precise control of the flow rate and on / off state of liquid carbon dioxide, ensuring the fluid control accuracy of the adsorption operation.

[0028] The bottom end of the drying cylinder I 2 and the drying cylinder II 3 is welded to connect the tee pipe fittings V 16, the two tee pipe fittings V 16 is provided between the tee pipe fittings IV 13, the two ends of the tee pipe fittings IV 13 is respectively connected with the flange of one end of the two tee pipe fittings V 16 through the valve V 14 and the valve VI 15. The structure of the valve V 14 and the valve VI 15 is consistent with the valve I 6, based on the same on-off control principle, for controlling the smooth export of the dried liquid carbon dioxide.

[0029] The fan 10 is fixedly installed at the top of the support seat 1 near the edge position, the air inlet end is connected with the drying gas source of 120-150°, the air outlet end is connected with the flange of the other end of the two tee pipe fittings II 5 through the tee pipe fittings III 11 and the valve III 8 and the valve IV 9. The structure of the valve III 8 and the valve IV 9 is the same as the valve I 6, based on the on-off control principle, for controlling the path of the regeneration gas into the drying cylinder, realizing the gas guiding when the adsorbent is regenerated. The other end of the two tee pipe fittings V 16 is respectively welded to connect the exhaust pipe 19 through the valve VII 17 and the valve VIII 18, the exhaust pipe 19 is used for transporting the regenerated gas and moisture to the designated position.

[0030] The adsorption bed body 23 is coaxially arranged in the drying cylinder I 2 and the drying cylinder II 3, the adsorption bed body 23 is a cylindrical structure, a certain gap is reserved between the outer wall of the adsorption bed body 23 and the inner wall of the drying cylinder, which is convenient for installation. The adsorption bed body 23 is fixedly provided with a partition plate 232, the partition plate 232 is a circular filter plate, the edge is welded and fixed with the inner wall of the adsorption bed body 23, the adsorption bed body 23 is divided into a containing chamber I 233 and a containing chamber II 234 from top to bottom, a plurality of through holes are uniformly arranged on the partition plate 232, based on the fluid flow principle, the gas and the liquid are exchanged smoothly, and the medium in the upper and lower chambers can be uniformly penetrated.

[0031] The containing chamber I 233 and the containing chamber II 234 are provided with a compression plate 237, the compression plate 237 is a circular steel plate, the edge is slidably connected with the inner wall of the adsorption bed body 23, a plurality of through holes are uniformly arranged on the compression plate 237, which ensures that the liquid carbon dioxide and the regeneration gas can pass through smoothly without causing excessive flow resistance. A plurality of sliding columns 238 are welded and fixed on the side of the compression plate 237 close to the partition plate 232, the outer wall of the sliding column 238 is movably sleeved with a connecting cylinder 239, one end of the connecting cylinder 239 is welded and fixed with the partition plate 232, and the other end is an open structure, allowing the sliding column 238 to slide axially in the connecting cylinder 239, realizing the flexible movement of the compression plate 237.

[0032] A spring I 240 is arranged in the connecting cylinder 239, and the two ends of the spring I 240 abut against the mutually close sides of the sliding cylinder 238 and the partition plate 232 respectively through spring seats, and the spring seats are welded and fixed on the end of the sliding cylinder 238 and the surface of the partition plate 232, for fixing the position of the spring I 240 and preventing the spring from deviating. Based on the elastic deformation principle of the spring, the spring I 240 can provide continuous elastic pressure for the compression plate 237, so as to ensure that the adsorbent layer is always in a moderately compressed state. The coarse-pore adsorbent 236 is filled above the compression plate 237 in the containing chamber I 233, and the coarse-pore adsorbent 236 is selected from coarse-pore spherical silica gel, the pore size of which is 8-15 nm, and the specific surface area is 300-400 m² / g. The material has developed macroporous structure, can quickly capture a large amount of free water in liquid carbon dioxide, and has excellent low-temperature and high-pressure resistance, and does not crack and fail at-56.6℃ and 4-7 MPa working conditions. The fine-pore adsorbent 235 is filled at the bottom of the compression plate 237 in the containing chamber II 234, and the fine-pore adsorbent 235 is selected from 13X zeolite molecular sieve, the pore size of which is 0.8-1.0 nm, and the specific surface area is 700-800 m² / g. The microporous structure is developed, and the adsorption selectivity to trace dissolved water is strong, and the residual water after pretreatment by the coarse-pore adsorbent 236 can be deeply removed. Based on the porous adsorption principle of the adsorbent, the coarse-pore adsorbent 236 removes a large amount of free water first, and the fine-pore adsorbent 235 deeply removes the residual dissolved water, so that deep dehydration is realized through graded adsorption, and the drying effect is improved.

[0033] Two fixed rings 24 are fixedly arranged in the drying cylinder I 2 and the drying cylinder II 3, and the two fixed rings 24 are welded and fixed on the upper part and the lower part of the inner wall of the drying cylinder respectively, and are matched with the height of the adsorption bed body 23. The inner wall of the fixed ring 24 is welded and fixed with a connecting diaphragm 26, and the connecting diaphragm 26 is a conical flexible structure. Based on the conical surface guiding principle, the flowing direction of the liquid carbon dioxide is changed, and the material is selected from perfluoroether rubber. The mutually close ends of the two connecting diaphragms 26 are welded and fixed with the two ends of the adsorption bed body 23 respectively. Based on the conical surface guiding principle, the conical structure can change the flowing direction of the liquid carbon dioxide, so that the fluid is uniformly distributed along the conical surface, the local flow rate is prevented from being too fast or too slow, and the liquid carbon dioxide can be guided to flow from outside to inside on the upper surface of the adsorption bed body 23.

[0034] The outer wall of the adsorption bed body 23 is welded and fixed with two groups of connecting lugs 27, which are located at the upper and lower parts of the adsorption bed body 23 respectively, and each group of connecting lugs 27 is uniformly distributed in the circumferential direction. The connecting lug 27 is connected with the fixed ring 24 through the spring II 25, one end of which is connected with the connecting lug 27 through a hook, and the other end is connected with the fixed ring 24 through a hook. Based on the buffer damping principle of the spring, the spring II 25 can buffer and position the adsorption bed body 23, avoid collision due to oscillation during work, and adapt to slight oscillation of the adsorption bed body 23. Through slight oscillation, each adsorbent particle obtains periodic "inertial force-gravity" alternating action, breaks the static friction force balance between particles, and produces 0.1-0.5mm micro relative sliding when particles instantaneously separate from fixed contact points. The originally adhered particle surface appears gap, and the "dead hole" is opened as "through hole". In the "relaxation- compaction" cycle of oscillation, the overall pore of the adsorbent layer is fluctuating, the aperture of the narrow communication hole is temporarily enlarged (such as from 0.1mm to 0.15mm), the fluid resistance is reduced, and the shear force generated by oscillation makes the dust and solidified water film attached to the surface of the particle or in the pore fall off and be discharged with liquid carbon dioxide or regeneration gas, restoring the original flow-through property of the pore.

[0035] The guide assembly 28 is arranged above the adsorption bed body 23 in the drying cylinder body I 2 and the drying cylinder body II 3, and the guide assembly 28 comprises a connecting shaft 231, the lower end of the connecting shaft 231 is welded and fixed at the top center position of the adsorption bed body 23, and the upper end is welded and fixed with a guide rod body 281. The guide rod body 281 is a conical structure, and a plurality of spiral strip bodies 284 are fixed and arranged outside the guide rod body 281, and a guide groove 285 is formed between adjacent two spiral strip bodies 284. Based on the spiral guide principle, the liquid carbon dioxide can flow downward along the spiral direction, and the liquid carbon dioxide can flow outward on the upper surface of the adsorption bed body 23.

[0036] The outer wall of the flow guide rod body 281 is connected with the same flow guide cover body 283 through a plurality of U-shaped connecting shafts 282, both ends of the U-shaped connecting shaft 282 are welded on the outer wall of the flow guide rod body 281 and the inner wall of the flow guide cover body 283 respectively, and the connection is firm and reliable. The flow guide cover body 283 is a conical ring structure, and a certain gap is reserved between the bottom of the flow guide cover body 283 and the top of the adsorption bed body 23. Based on the flow distribution principle, the flow guide cover body 283 divides the top of the adsorption bed body 23 into the adsorption area I 29 and the adsorption area II 30, realizing the bidirectional flow distribution of the liquid carbon dioxide. After the liquid carbon dioxide enters the top of the drying cylinder body, part of it flows down along the outer wall of the flow guide rod body 281 and is guided into the adsorption area II 30 through the flow guide groove 285; the other part flows to the sliding column body 238 through the gap between the U-shaped connecting shafts 282, and is guided to the inner wall of the connecting diaphragm 26 through the conical surface of the sliding column body 238, and finally uniformly enters the adsorbent layer in the adsorption bed body 23, ensuring that the adsorbent is fully utilized.

[0037] The inner wall of the upper connecting diaphragm 26 is welded and fixed with a plurality of flow guide strip bodies 261, which are uniformly distributed along the inner wall of the connecting diaphragm 26. Based on the flow distribution and diffusion principle, the liquid carbon dioxide can be further guided to uniformly diffuse on the inner wall of the connecting diaphragm 26, avoiding the problem of insufficient adsorption caused by too fast local flow rate, and ensuring that the fluid is in full contact with the adsorbent.

[0038] The device also includes a detection assembly, which includes a sampling valve 20, one end of which is communicated to the side of the three-way pipe Ⅴ 16 through welding, for extracting the dried liquid carbon dioxide sample, and the sampling position can accurately reflect the actual state of the dried liquid carbon dioxide. The other end of the sampling valve 20 is connected to a pressure relief valve 21 through a flange, which can prevent the safety hazard caused by excessive pressure in the sampling pipeline based on the pressure release principle, and ensure the safety of the sampling process. The other end of the pressure relief valve 21 is connected to a dew point instrument through a connecting pipeline 22, which is made of low-temperature and corrosion-resistant materials, and can adapt to the working environment of liquid carbon dioxide. The dew point instrument adopts DewTech390 cold mirror type dew point instrument, which can monitor the dew point of the dried liquid carbon dioxide in real time, and can prompt the need for regeneration of the adsorbent when the dew point reaches the set threshold, providing accurate basis for the regeneration operation.

[0039] The valve I 6, the valve II 7, the valve III 8, the valve IV 9, the valve V 14, the valve VI 15, the valve VII 17 and the valve VIII 18 are all electric high-pressure ball valves, equipped with multi-rotation electric actuators, supporting automatic switching and state feedback, and the top of the support seat 1 is also fixed with a control cabinet 12, and each valve is connected to the controller in the control cabinet 12 through wires to control the opening and closing of the valve, realizing intelligent control.

[0040] The working process of the device is as follows: during the adsorption operation, valve I 6 and valve VI 15 are opened, and the remaining valves are closed. Liquid carbon dioxide is divided into two parts by the diversion of guide rod body 281 and U-shaped connecting shaft 282, one part of the fluid flows along the guide groove 285 of the outer wall of the guide rod body 281, enters the adsorption area 130, and the fluid carries tangential kinetic energy, which presents a centrifugal diffusion trend from the inside to the outside after entering the bed layer; the other part of the fluid passes through the gap of the U-shaped connecting shaft 282, is guided by the conical surface of the sliding column 238 and the inner wall of the flow guide strip body 261 of the connecting membrane 26, enters the adsorption area 129, and the fluid presents a centripetal contraction trend from the outside to the inside.

[0041] The two fluids with different radial velocity vectors collide and mix at the microscopic level inside the adsorption bed body 23, completely destroying the laminar boundary layer formed due to the low viscosity of liquid carbon dioxide, making the fluid velocity uniform across the cross section of the adsorption bed, and avoiding the problem of excessive central flow velocity. Both parts of the liquid carbon dioxide enter the adsorption bed body 23, based on the porous adsorption principle of the adsorbent, first pass through the coarse pore adsorbent 236 in the containing chamber I 233 to preliminarily remove a large amount of water, then pass through the through hole of the partition plate 232 into the containing chamber II 234, and then pass through the fine pore adsorbent 235 to deeply remove the residual water. The dried liquid carbon dioxide flows out from the bottom of the adsorption bed body 23, enters the three-way pipe V 16 through the valve VI 15, enters the three-way pipe IV 13, and is transported to the subsequent storage tank. In this process, the detection assembly draws samples through the sampling valve 20, reduces the pressure through the pressure relief valve 21, and sends them to the dew point instrument for detection, real-time monitoring of the dehydration effect, and ensuring that the dew point of the output liquid carbon dioxide meets the requirements.

[0042] When the gaseous dew point of the liquid carbon dioxide in the drying cylinder I 2 is ≥-35℃, it is determined that the adsorbent has been saturated, and the regeneration operation is performed on the adsorption bed body 23 in the drying cylinder I 2. Valve I 6 and valve VI 15 are closed, valve III 8 is opened, and fan 10 is started. The fan 10 sends dry gas into the three-way pipe III 11, and then into the three-way pipe II 5 of the drying cylinder I 2 through the valve III 8, and then into the adsorption bed body 23. Based on the adsorption-desorption equilibrium principle, when the dry gas flows through the fine pore adsorbent 235 and the coarse pore adsorbent 236, the adsorption balance is broken, and the water adsorbed by the adsorbent is desorbed. The regeneration gas carrying water enters the three-way pipe V 16, and valve VIII 18 is opened to make the regeneration gas flow out of the device through the exhaust pipe 19.

[0043] At the same time, the valve II 7 and valve V 14 are opened, so that the delivered liquid carbon dioxide enters the drying cylinder II 3, and is dried by the adsorption bed 23 in the drying cylinder II 3, and finally enters the three-way pipe V 16 and valve V 14 into the three-way pipe IV 13, and is delivered to the subsequent storage tank, so as to be used alternately.

[0044] During the adsorption process, based on the spring buffer damping principle, the spring II 25 can buffer and position the adsorption bed 23, avoid collision due to oscillation during work, and adapt to slight oscillation of the adsorption bed 23. Through slight oscillation, each adsorbent particle obtains periodic "inertia force-gravity" alternating action, breaks the static friction force balance between particles, and produces 0.1-0.5mm micro relative sliding when the particles instantaneously separate from the fixed contact point. The originally adhered particle surface appears a gap, and the "dead hole" is opened as a "through hole". In the oscillation "relaxation-compaction" cycle, the overall pore of the adsorbent layer is fluctuating, the aperture of the narrow connecting hole is temporarily enlarged (such as from 0.1mm to 0.15mm), the fluid resistance is reduced, and the shear force generated by the oscillation makes the dust and frozen water film attached to the surface of the particles or in the pores fall off and be discharged with the liquid carbon dioxide or the regeneration gas, so as to restore the original flowability of the pores.

[0045] Finally, it should be pointed out that the above examples are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions, which should be covered in the scope of the claims of the present application.

Claims

1. A high-efficiency dryer for storage applications based on liquid carbon dioxide capture method, characterized in that, include: Support base (1), the top of which is fixedly provided with drying cylinder I (2) and drying cylinder II (3); The tops of the drying cylinder I (2) and the drying cylinder II (3) are connected to the three-way fitting I (4) through the three-way fitting II (5). The two ends of the three-way fitting I (4) are connected to one end of the two three-way fittings II (5) through the valve I (6) and the valve II (7) respectively. The bottom ends of the drying cylinder I (2) and the drying cylinder II (3) are connected to the tee fitting IV (13) through the tee fitting V (16). The two ends of the tee fitting IV (13) are connected to one end of the two tee fittings V (16) through valve V (14) and valve VI (15) respectively. A fan (10) is installed on the top of the support base (1). The exhaust end of the fan (10) is connected to a three-way fitting III (11). The other two ends of the three-way fitting III (11) are connected to the other ends of two three-way fittings II (5) through valves III (8) and IV (9), respectively. The other ends of the two three-way fittings V (16) are connected to an exhaust pipe (19) through valves VII (17) and VIII (18), respectively. Both the drying cylinder I (2) and the drying cylinder II (3) are equipped with an adsorption bed (23). The adsorption bed (23) is equipped with a coarse-porous adsorbent (236) and a fine-porous adsorbent (235). The coarse-porous adsorbent (236) is used to remove free water from liquid carbon dioxide, and the fine-porous adsorbent (235) is used to deeply remove dissolved water. Both the drying cylinder I (2) and the drying cylinder II (3) are provided with a guide assembly (28) located above the adsorption bed (23). The guide assembly (28) includes a guide rod (281) and a guide hood (283). The guide hood (283) divides the top of the adsorption bed (23) into an adsorption region I (29) and an adsorption region II (30). This allows a portion of the liquid carbon dioxide to flow downward along the outer wall of the guide rod (281) and enter the adsorption region II (30) to diffuse from the inside out. Another portion is guided by the guide hood (283) and enters the adsorption region I (29) to diffuse from the outside in, thus achieving radial bidirectional diversion.

2. The high-efficiency dryer for storage applications based on liquid carbon dioxide capture method according to claim 1, characterized in that, The adsorption bed (23) is fixedly provided with a partition plate (232), which divides the adsorption bed (23) into a receiving chamber I (233) and a receiving chamber II (234). Both the receiving chamber I (233) and the receiving chamber II (234) are provided with a pressing plate (237). A sliding column (238) is fixedly provided on the side of the pressing plate (237) near the partition plate (232). A connecting cylinder (239) is sleeved on the outer wall of the sliding column (238). The connecting cylinder (239) is fixedly connected to the partition plate (232). A spring I (240) is provided inside the connecting cylinder (239). The two ends of the spring I (240) abut against the sliding column (238) and the partition plate (232) respectively.

3. The high-efficiency dryer for storage applications based on liquid carbon dioxide capture method according to claim 2, characterized in that, Two fixing rings (24) are fixedly provided inside the drying cylinder I (2) and the drying cylinder II (3). A connecting membrane (26) is fixedly provided on the inner wall of the fixing ring (24). The two connecting membranes (26) are fixedly connected to the two ends of the adsorption bed (23) respectively. The connecting membrane (26) is a conical flexible structure.

4. The high-efficiency dryer for storage applications based on liquid carbon dioxide capture method according to claim 3, characterized in that, The outer wall of the adsorption bed (23) is fixedly provided with a connecting lug (27), and a spring II (25) is connected between the connecting lug (27) and the fixing ring (24).

5. The high-efficiency dryer for storage applications based on liquid carbon dioxide capture method according to claim 4, characterized in that, The guide assembly (28) includes a connecting shaft (231) fixed to the top of the adsorption bed (23). A guide rod body (281) is fixedly provided on the top of the connecting shaft (231). The outer wall of the guide rod body (281) is connected to the guide hood body (283) through multiple U-shaped connecting shafts (282). The guide hood body (283) is a conical ring structure.

6. The high-efficiency dryer for storage applications based on liquid carbon dioxide capture method according to claim 5, characterized in that, The guide rod (281) is conical, and its outer wall is fixed and surrounded by multiple spiral strips (284), with a guide channel (285) formed between two adjacent spiral strips (284).

7. The high-efficiency dryer for storage applications based on liquid carbon dioxide capture method according to claim 6, characterized in that, The inner wall of the connecting diaphragm (26) located above is fixed with a plurality of guide strips (261), which are evenly distributed along the circumference of the inner wall of the connecting diaphragm (26).

8. The high-efficiency dryer for storage applications based on liquid carbon dioxide capture method according to any one of claims 1 to 7, characterized in that, It also includes a detection component, which includes a sampling valve (20) connected to a tee fitting V (16), the other end of which is connected to a pressure relief valve (21), and the other end of which is connected to a dew point meter via a connecting pipe (22).

9. The high-efficiency dryer for storage applications based on liquid carbon dioxide capture method according to claim 8, characterized in that, The coarse-porous adsorbent (236) is a coarse-porous spherical silica gel with a pore size of 8-15 nm and a specific surface area of ​​300-400 m² / g; The fine-porous adsorbent (235) is a 13X zeolite molecular sieve with a pore size of 0.8-1.0 nm and a specific surface area of ​​700-800 m² / g, which achieves deep dehydration through graded adsorption.

10. The high-efficiency dryer for storage applications based on liquid carbon dioxide capture method according to claim 9, characterized in that, The drying cylinder I (2) and drying cylinder II (3) are equipped with valves to enable alternating adsorption and regeneration operations.

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