falling film absorber

Abstract

This invention discloses a falling film absorber, comprising a shell, a falling film tube, a spray pipe, and a replenishment pipe. The shell has a chamber, an air inlet, and an air outlet. The air inlet is located at the bottom of the shell, and the air outlet is located at the top of the shell. Both the air inlet and outlet communicate with the chamber. The falling film tube is disposed inside the shell and includes multiple sequentially connected sub-tubes spaced apart along the height direction of the shell. The spray pipe is disposed inside the shell above the falling film tube and has multiple spray nozzles. The replenishment pipe is disposed inside the shell and spaced apart from the spray pipe along the height direction of the shell, located below the spray pipe. At least some sub-tubes are located between the spray pipe and the replenishment pipe, and other sub-tubes are located below the replenishment pipe, which has multiple replenishment nozzles. The falling film absorber of this invention has advantages such as simple structure, high mass transfer coefficient, and strong heat exchange efficiency.

Description

Technical Field

[0001] This invention relates to the field of chemical engineering and heat exchange equipment, specifically to a falling film absorber. Background Technology

[0002] Falling film absorbers are widely used in seawater desalination, air conditioning and refrigeration, petrochemicals, and waste heat recovery. Common arrangements of falling film tubes include vertical tubes and horizontal tubes. Among them, the absorption process of horizontal tube falling film absorbers includes solution absorption on the surface of the falling film tube and solution absorption processes of various flow patterns between the tubes, which has the advantages of high absorption efficiency, low pressure resistance, and flexible adjustment.

[0003] In related technologies, falling film absorbers suffer from reduced mass transfer coefficients and poor heat exchange efficiency. Summary of the Invention

[0004] This invention is based on the inventor's discoveries and understanding of the following facts and problems:

[0005] In related technologies, the important indicator affecting the absorption performance of horizontal tube falling film absorbers is their mass transfer coefficient. The magnitude of this coefficient is affected by multiple factors, including solution concentration, flow rate and temperature, gas moisture content, flow rate and temperature, and the flow rate and temperature of cooling water inside the tube. Solution concentration and flow rate are the most important influencing factors.

[0006] To ensure absorption efficiency, falling film absorption tubes are typically arranged in multiple rows. The initial high-concentration solution flows down from the highest distribution tube, then along the outer wall of the horizontal tubes, forming droplets that collide with the next row of horizontal tubes, absorbing water vapor from the gas during this process. As the number of tube rows increases, the solution concentration gradually decreases, the mass transfer coefficient decreases, and the absorption performance drops significantly.

[0007] Experiments show that the mass transfer coefficient of the lower tubes decreases by 10% compared to the upper tubes, and after ten tubes of falling film, the mass transfer coefficient of the solution decreases by 80%.

[0008] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, embodiments of this invention propose a falling film absorber with a simple structure, high mass transfer coefficient, and high heat exchange efficiency.

[0009] The falling film absorber of this invention includes: a housing having a chamber, an air inlet, and an air outlet, the air inlet being located at the bottom of the housing, the air outlet being located at the top of the housing, and both the air outlet and the air inlet communicating with the chamber; a falling film tube disposed within the housing, the falling film tube including a plurality of sequentially connected sub-tubes, the plurality of sub-tubes being spaced apart along the height direction of the housing; and a spray pipe disposed within the housing above the falling film tube, the spray pipe having a plurality of spray nozzles. The spray nozzles are arranged facing the side adjacent to the falling film pipe and are spaced apart along the axial direction of the spray pipe; the replenishment pipe is disposed inside the housing and is spaced apart from the spray pipe along the height direction of the housing, the replenishment pipe is located below the spray pipe, at least a portion of the sub-pipes are located between the spray pipe and the replenishment pipe, and another portion of the sub-pipes are located below the replenishment pipe, the replenishment pipe has multiple replenishment ports, the multiple replenishment ports are arranged facing the side away from the spray pipe and are spaced apart along the axial direction of the replenishment pipe.

[0010] The falling film absorber of this invention is equipped with a replenishment pipe, which replenishes the initial high-concentration solution to another part of the sub-tubes. This continuously renews the surface of the original low-concentration solution in the other part of the sub-tubes, increases the concentration of the solution at the gas-liquid interface, and thus increases the mass transfer driving force and mass transfer coefficient, thereby significantly improving the absorption effect.

[0011] In some embodiments, the replenishment tube includes a first tube and a second tube, the first tube being sleeved over the second tube, the first tube having a plurality of first ports, the plurality of first ports being spaced apart along the axial direction of the first tube, the second tube having a plurality of second ports, the plurality of second ports being spaced apart along the axial direction of the second tube, the distance between two adjacent second ports being the same as the distance between two adjacent first ports, and at least a portion of the first port communicating with the second port to form the replenishment port.

[0012] In some embodiments, one of the first tube and the second tube may be axially movable relative to the other of the first tube and the second tube in order to adjust the size of the inlet.

[0013] In some embodiments, one of the first tube and the second tube may be rotatable relative to the other of the first tube and the second tube in order to adjust the size of the inlet.

[0014] In some embodiments, the falling film absorber further includes a connecting member, one end of which is connected to the spray pipe and the other end of which is connected to the replenishment pipe, so that the liquid in the spray pipe flows into the replenishment pipe.

[0015] In some embodiments, the falling film absorber further includes a mounting bracket disposed within the housing, wherein each of the plurality of sub-tubes, the spray tubes, and the replenishment tubes is disposed on the mounting bracket.

[0016] In some embodiments, the falling film absorber further includes a turbulence assembly comprising a first annular body and a plurality of turbulence vanes. The first annular body and the turbulence vanes are both disposed within the falling film tube. The turbulence vanes are wavy. The plurality of turbulence vanes are connected to the first annular body and are spaced apart circumferentially along the first annular body. The plurality of turbulence vanes are located at one end of the first annular body away from the inlet of the falling film tube. At least a portion of the turbulence vanes is in contact with the inner circumferential surface of the falling film tube body so that when the coolant flows into the falling film tube, the turbulence vanes vibrate to disturb the thermal boundary layer on the inner circumferential surface of the falling film tube.

[0017] In some embodiments, the turbulence-disrupting component further includes a second annular body and a stiffener. The second annular body is sleeved on the outer periphery of the first annular body, and the outer periphery of the first annular body and the inner periphery of the second annular body are spaced apart to form a channel. The stiffener is disposed between the first annular body and the second annular body, and the stiffener is connected to the first annular body and the second annular body respectively, so that the second annular body is disposed on the first annular body.

[0018] In some embodiments, the first annular body includes a first portion and a second portion that are connected to each other, the second portion being located at the end of the first portion away from the inlet, and the outer diameter of the first portion gradually decreasing along the direction adjacent to the inlet.

[0019] In some embodiments, the falling film tube has a first portion and a second portion arranged sequentially in a first direction, with the two ends of the first portion respectively connected to the two ends of the second portion; the falling film absorber further includes a first draining element and a second draining element, the first draining element being disposed on the first portion, the first draining element including a first segment and a second segment connected to each other, the extension direction of the first segment and the extension direction of the second segment forming an angle, and there are multiple first draining elements, the multiple first draining elements being arranged at intervals along the axial and / or circumferential direction of the falling film tube; the second draining element is disposed on the second portion, the second draining element including a third segment and a fourth segment connected to each other, the extension direction of the third segment and the extension direction of the fourth segment forming an angle, and there are multiple second draining elements, the multiple second draining elements being arranged at intervals along the axial and / or circumferential direction of the falling film tube. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the falling film absorber according to an embodiment of the present invention.

[0021] Figure 2 This is a schematic diagram of the replenishment tube of the falling film absorber according to an embodiment of the present invention.

[0022] Figure 3 This is a schematic diagram of the structure of the first tube of the replenishment tube of the falling film absorber according to an embodiment of the present invention.

[0023] Figure 4 This is a schematic diagram of the structure of the second tube of the replenishment tube of the falling film absorber according to an embodiment of the present invention.

[0024] Figure 5 This is a cross-sectional view of the replenishment tube of the falling film absorber according to an embodiment of the present invention.

[0025] Figure 6 This is a front view of the falling film tube of the falling film absorber according to an embodiment of the present invention.

[0026] Figure 7 yes Figure 6 A magnified view of part A in the image.

[0027] Figure 8 This is a top view of the falling film tube of the falling film absorber according to an embodiment of the present invention.

[0028] Figure 9 yes Figure 8 A magnified view of part B in the image.

[0029] Figure 10 This is a bottom view of the falling film tube of the falling film absorber according to an embodiment of the present invention.

[0030] Figure 11 yes Figure 10 A magnified view of part C.

[0031] Figure 12 This is a schematic diagram of the structure of the turbulence assemblies of the falling film absorber in an embodiment of the present invention installed in the falling film tube.

[0032] Figure 13 yes Figure 12 A magnified view of part of D.

[0033] Figure 14 This is a schematic diagram of the turbulence component of the falling film absorber according to an embodiment of the present invention.

[0034] Figure 15 This is a front view of the turbulence component of the falling film absorber according to an embodiment of the present invention.

[0035] Figure label:

[0036] Falling film absorber 100;

[0037] Falling film tube 1; Inlet 11; Outlet 12; First cavity 13; Protrusion 14; Third section 15; Fourth section 16; Sub-tube 17; First plate 18; Second plate 19

[0038] 2. Aerodynamic component; 21. First annular body; 211. Second part; 212. Aerodynamic vane; 22. Second annular body; 23. Rib plate; 24.

[0039] Spray pipe 3; spray nozzle 31

[0040] Infusion tube 4; First tube 41; First port 411; Second tube 42; Second port 421; Infusion port 43;

[0041] First drainage component 5; First segment 51; Second segment 52; Fifth segment 53;

[0042] Second drainage component 6; Third segment 61; Fourth segment 62; Sixth segment 63;

[0043] Mounting bracket 7; first mounting plate 71; second mounting plate 72. Detailed Implementation

[0044] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0045] The falling film absorber according to an embodiment of the present invention is described below with reference to the accompanying drawings.

[0046] like Figure 1-15 As shown, the falling film absorber 100 according to an embodiment of the present invention includes a housing (not shown in the figure), a falling film tube 1, a spray tube 3, and a replenishment tube 4.

[0047] The shell has a chamber (not shown in the figure), an air inlet (not shown in the figure), and an air outlet (not shown in the figure). The air inlet is located at the bottom of the shell, and the air outlet is located at the top of the shell. Both the air inlet and the air outlet communicate with the chamber. Specifically, the top of the shell has an air outlet, and the bottom of the shell has an air inlet, so that the heat exchange gas can flow into the shell from the bottom of the shell, exchange heat inside the shell, and then flow out through the air outlet.

[0048] Falling film tube 1 is located inside the shell. Falling film tube 1 includes multiple sub-tubes 17 connected in sequence. The multiple sub-tubes 17 are arranged along the height direction of the shell (e.g., Figure 1 The vertical (as shown) intervals are set. Specifically, as... Figure 1As shown, multiple sub-tubes 17 are arranged at intervals along the top and bottom, and three adjacent sub-tubes 17 form an S-shape. The lower end of the falling film tube 1 is the inlet 11 and extends out of the shell so that coolant can flow into the falling film tube 1. The upper end of the falling film tube 1 is the outlet 12 and extends out of the shell so that the heated coolant can flow out of the falling film tube 1.

[0049] The spray pipe 3 is located inside the housing above the falling film pipe 1. The spray pipe 3 has multiple spray nozzles 31, which are positioned facing the side adjacent to the falling film pipe 1 and along the axial direction of the spray pipe 3 (e.g., ...). Figure 1 The left and right directions are shown in the diagram. Specifically, as shown... Figure 1 As shown, the spray pipe 3 is located inside the shell and above the falling film tube 1. The lower end of the spray pipe 3 is provided with multiple spray nozzles 31. The multiple spray nozzles 31 are arranged at intervals with the falling film tube 1 in the vertical direction. By introducing liquid (e.g., lithium bromide solution or calcium chloride solution) into the spray pipe 3, the liquid is sprayed onto the falling film tube 1 through the spray nozzles 31, so that the solution is distributed on the outer peripheral surface of the falling film tube 1. At the same time, the liquid absorbs water vapor in the gas, and after the water vapor is absorbed by the solution, heat is released at the gas-liquid interface on the outer peripheral surface of the falling film tube 1. The heat is transferred to the coolant inside the tube through the tube wall of the falling film tube 1, so that the coolant and the gas exchange heat, thereby increasing the temperature of the coolant and decreasing the temperature of the gas, and then absorbing the heat energy in the gas through the coolant.

[0050] The replenishment pipe 4 is located inside the housing and is spaced apart from the spray pipe 3 along the height direction of the housing. The replenishment pipe 4 is located below the spray pipe 3. At least a portion of the sub-pipes 17 are located between the spray pipe 3 and the replenishment pipe 4, and another portion of the sub-pipes 17 are located below the replenishment pipe 4. The replenishment pipe 4 has multiple replenishment ports 43, which are arranged facing away from the spray pipe 3 and spaced apart along the axial direction of the replenishment pipe 4. Specifically, as shown... Figure 1 As shown, the replenishment pipe 4 is located inside the shell and below the spray pipe 3, and is spaced apart from the spray pipe 3 in the vertical direction. Multiple replenishment ports 43 are provided below the replenishment pipe 4, and the multiple replenishment ports 43 are spaced apart in the horizontal direction. A portion of the sub-pipe 17 is located between the spray pipe 3 and the replenishment pipe 4. The spray pipe 3 sprays a portion of the sub-pipe 17, so that the liquid is distributed on the outer peripheral surface of the falling film pipe 1 to form a gas-liquid interface. Another portion of the sub-pipe 17 is located below the replenishment pipe 4. The multiple replenishment ports 43 are spaced apart from the other portion of the sub-pipe 17 in the vertical direction, so as to replenish the other portion of the sub-pipe 17, ensuring the solution concentration outside the other portion of the sub-pipe 17 and ensuring the mass transfer coefficient of the other portion of the sub-pipe 17.

[0051] The falling film absorber 100 of this embodiment of the invention is provided with a replenishment pipe 4 to replenish the falling film tube 1, thereby increasing the concentration of the solution on the outer surface of another part of the sub-tube 17. This allows the other part of the sub-tube 17 to continuously renew the original low-concentration solution surface, increasing the concentration of the solution at the gas-liquid interface of the other part of the sub-tube 17. This, in turn, increases the mass transfer driving force and mass transfer coefficient of the other part of the sub-tube 17, significantly improving the absorption effect of the other part of the sub-tube 17 and ensuring the working efficiency of the falling film absorber 100.

[0052] In some embodiments, the falling film absorber 100 further includes a mounting frame 7 disposed within the housing, on which each of the plurality of sub-tubes 17, the spray tube 3, and the replenishment tube 4 is mounted. Specifically, as Figure 1 As shown, the mounting frame 7 includes a first mounting plate 71 and a second mounting plate 72. The first mounting plate 71 and the second mounting plate 72 are fixed inside the housing. The first mounting plate 71 and the second mounting plate 72 are arranged opposite each other at intervals in the left-right direction. The first mounting plate 71 and the second mounting plate 72 are provided with multiple through holes in the up-down direction (not shown in the figure). The through holes on the first mounting plate 71 and the through holes on the second mounting plate 72 are arranged opposite each other at intervals in the left-right direction. Each sub-pipe 17, spray pipe 3, and replenishment pipe 4 passes through the through holes on the first mounting plate 71 and the second mounting plate 72, thereby providing a mounting base for multiple sub-pipes 17, spray pipes 3, and replenishment pipes 4 through the mounting frame 7.

[0053] In some embodiments, the replenishment tube 4 includes a first tube 41 and a second tube 42. The first tube 41 is sleeved over the second tube 42. The first tube 41 has a plurality of first ports 411, which are spaced apart along the axial direction of the first tube 41. The second tube 42 has a plurality of second ports 421, which are spaced apart along the axial direction of the second tube 42. The distance between two adjacent second ports 412 is the same as the distance between two adjacent first ports 411. At least a portion of the first ports 411 communicates with the second ports 421 to form a replenishment port. Specifically, as shown... Figure 2-5 As shown, the first tube 41 is the outer tube and the second tube 42 is the inner tube. The first tube 41 or the second tube 42 can be inserted into the first mounting plate 71 and the second mounting plate 72. The first tube 41 is sleeved on the second tube 42. The first tube 41 has multiple first ports 411 below it. The multiple first ports 411 are spaced apart on the first tube 41 in the left and right direction. The second tube 42 has multiple second ports 421 below it. The multiple second ports 421 are spaced apart on the second tube 42 in the left and right direction. The first ports 411 and the second ports 421 can be arranged opposite each other in the radial direction of the replenishment tube 4, so that the other part of the sub-tube 17 can be replenished through the replenishment port.

[0054] In some embodiments, one of the first tube 41 and the second tube 42 may be movable relative to the other in the axial direction to adjust the size of the inlet 43. Specifically, the first tube 41 and the second tube 42 may be configured according to actual conditions. The first tube 41 may be movable in the left-right direction, or the second tube 42 may be movable in the left-right direction, or both the first tube 41 and the second tube 42 may be movable in the left-right direction, thereby adjusting the size of the inlet and avoiding waste of solution.

[0055] In some embodiments, one of the first tube 41 and the second tube 42 may be rotatable relative to the other to adjust the size of the inlet 43. Specifically, the first tube 41 and the second tube 42 may be configured according to actual conditions. The first tube 41 may be rotatable circumferentially, or the second tube 42 may be rotatable circumferentially, or both the first tube 41 and the second tube 42 may be rotatable circumferentially, thereby adjusting the size of the inlet and avoiding waste of solution.

[0056] In some embodiments, the falling film absorber 100 further includes a connecting member (not shown in the figure), one end of which is connected to the spray pipe 3, and the other end of which is connected to the replenishment pipe 4, so that the liquid in the spray pipe 3 flows into the replenishment pipe 4. Specifically, the connecting member is a rigid connecting pipe, one end of which is connected to one end of the spray pipe 3, and the other end of which is connected to the other end of the replenishment pipe 4. Thus, the solution in the spray pipe 3 can flow into the replenishment pipe 4 through the connecting member, eliminating the need for an additional pipe to the replenishment pipe 4 for replenishment, thereby reducing the manufacturing cost of the falling film absorber 100.

[0057] Experiments show that the mass transfer coefficient of the sub-tubes 17 gradually decreases from top to bottom. When the number of sub-tubes 17 reaches ten, the solution mass transfer coefficient decreases by 80%. Therefore, in some embodiments, the number of sub-tubes 17 is 8-12 in some parts and 8-12 in others. This ensures the working performance of the falling film absorber 100.

[0058] It is understandable that when there are many sub-tubes 17 in the falling film absorber 100, there can be multiple replenishment tubes 4. Multiple replenishment tubes 4 are all located inside the housing and below the spray tube 3. Multiple replenishment tubes 4 are spaced apart in the vertical direction, and multiple sub-tubes 17 are provided below each replenishment tube 4.

[0059] In some embodiments, the falling film absorber 100 further includes a turbulence assembly 2, which includes a first annular body 21 and a plurality of turbulence plates 22. Both the first annular body 21 and the turbulence plates 22 are disposed within the falling film tube 1. The turbulence plates 22 are wavy. The plurality of turbulence plates 22 are connected to the first annular body 21 and are spaced apart circumferentially along the first annular body 21. The plurality of turbulence plates 22 are located at one end of the first annular body 21 away from the inlet 11 of the falling film tube 1. At least a portion of the turbulence plates 22 contacts the inner circumferential surface of the falling film tube 1 body, so that when coolant flows into the falling film tube 1, the turbulence plates 22 vibrate to disturb the thermal boundary layer on the inner circumferential surface of the falling film tube 1. Specifically, as... Figure 12-15 As shown, the cross-section of the first annular body 21 can be rectangular, polygonal, circular, elliptical, etc., and the baffle 22 can be a wave-shaped elastic sheet. The baffle 22 is located on the left side of the first annular body 21 and is spaced apart along the circumference of the first annular body 21. When the coolant in the first cavity 13 flows to the baffle 22, the flow rate of the coolant changes, and the impact of the coolant will cause the baffle 22 to vibrate, thereby destroying the boundary layer on the inner circumferential surface of the falling film tube 1 body to reduce thermal resistance, improve the heat transfer and mass transfer coefficient of the falling film tube 1 body, and ensure the heat transfer efficiency of the falling film tube 1 body.

[0060] In some embodiments, the turbulence assembly 2 further includes a second annular body 23 and a stiffener 24. The second annular body 23 is sleeved on the outer periphery of the first annular body 21, and the outer periphery of the first annular body 21 and the inner periphery of the second annular body 23 are spaced apart to form a channel. The stiffener 24 is disposed between the first annular body 21 and the second annular body 23, and the stiffener 24 is connected to the first annular body 21 and the second annular body 23 respectively, so that the second annular body 23 is disposed on the first annular body 21.

[0061] Specifically, such as Figure 12-15As shown, the cross-sectional area of ​​the second annular body 23 can be rectangular, polygonal, circular, elliptical, etc., and the second annular body 23 is fitted onto the outer circumferential surface of the first annular body 21. The left end face of the second annular body 23 is flush with the left end face of the first annular body 21, and the length of the first annular body 21 is longer than the length of the second annular body 23. The outer circumferential surfaces of the first annular body 21 and the second annular body 23 are spaced apart along the inward and outward directions to form a channel. The inner circumferential surface of the stiffening plate 24 is connected to the outer circumferential surface of the first annular body 21. The outer peripheral surface of the first annular body 23 is connected to the inner peripheral surface of the second annular body 23, thereby connecting the second annular body 23 and the first annular body 21 through the stiffener 24. The outer peripheral surface of the second annular body 23 is in contact with the inner peripheral surface of the falling film tube 1. As a result, part of the coolant flowing to the turbulence assembly 22 flows into the first annular body 21, and the other part of the coolant flows into the channel. Thus, part of the coolant impacts the inner peripheral surface of the turbulence plate 22, and the other part of the coolant impacts the outer peripheral surface of the turbulence plate 22, thereby improving the vibration effect of the turbulence plate 22.

[0062] In some embodiments, the inner circumferential surface of the falling film tube 1 is provided with a protrusion 14 extending inward in the inward and outward direction. The protrusion 14 abuts against one end of the first annular body 21 adjacent to the outlet 12, so that the flow-disrupting assembly 2 is disposed within the body of the falling film tube 1. Specifically, as Figure 13 As shown, there can be multiple protrusions 14, which are arranged circumferentially along the inner circumferential surface of the falling film tube 1. The left end of the first annular body 21 and the left end of the second annular body 23 abut against the right end of the protrusion 14. Thus, the protrusion 14 can be used to hold the turbulence component in place and prevent the turbulence component from moving with the water flow direction. When the coolant in the falling film tube 1 flows, it can impact the turbulence component 2 from right to left. Therefore, the protrusion 14 can prevent the turbulence component 2 from moving inside the falling film tube 1 and ensure the stability of the turbulence component 2.

[0063] It is understood that the arrangement of the turbulence component 2 and the falling film tube 1 is not limited to this. For example, the second annular body 23 of the turbulence component 2 and the body of the falling film tube 1 are connected by adhesive, or by fasteners passing through the outer peripheral surface of the body of the falling film tube 1 and connecting to the second annular body 23, etc.

[0064] In some embodiments, the first annular body 21 includes a third portion 211 and a fourth portion 212 that are connected to each other. The fourth portion 212 is located at the end of the third portion 211 away from the inlet 11, and the outer diameter of the third portion 211 gradually decreases along the direction adjacent to the inlet 11. Specifically, as Figure 15As shown, the third part 211 is located to the right of the fourth part 212. The outer diameter of the outer circumference of the third part 211 gradually decreases from left to right. As a result, the velocity difference between the flow rate of the coolant flowing into the inner circumference of the first annular body 21 and the flow rate of the coolant in the channel will increase, making the flow rate of another part of the liquid greater than that of a part of the liquid. This causes a velocity difference to form between the inner and outer surfaces of the liquid in the baffle 22, further aggravating the vibration of the baffle 22 and improving the disturbance effect of the baffle assembly 2.

[0065] In some embodiments, the falling film tube 1 has a first portion 15 and a second portion 16 arranged sequentially in a first direction, with the two ends of the first portion 15 respectively connected to the two ends of the second portion 16. Specifically, as shown... Figure 6-11 As shown, the first direction is the front-to-back direction, the first part 15 is the front half of the falling film tube 1, the second part 16 is the rear half of the falling film tube 1, the upper end of the first part 15 is connected to the upper end of the second part 16, and the lower end of the first part 15 is connected to the lower end of the second part 16, thereby forming the falling film tube 1 through the first part 15 and the second part 16.

[0066] In some embodiments, the falling film absorber 100 further includes a first drainage member 5 disposed on the first portion 15. The first drainage member 5 includes a first segment 51 and a second segment 52 connected to each other, with the extension direction of the first segment 51 and the extension direction of the second segment 52 forming an angle. There are multiple first drainage members 5, and the multiple first drainage members 5 are arranged at intervals along the axial and / or circumferential directions of the falling film tube 1. Specifically, as shown... Figure 7 , Figure 9 and Figure 11 As shown, the first drainage element 5 can be disposed on the outer peripheral surface of the first part 15. Multiple first drainage elements 5 are spaced apart in the circumferential direction of the falling film pipe 1 to form multiple rows. Each row of first drainage elements 5 includes several first drainage elements 5 spaced apart in the left-right direction. Each first drainage element 5 includes a first segment 51 and a second segment 52 connected to each other. The first segment 51 extends from top to bottom and tilts to the right, while the second segment 52 extends from top to bottom and tilts to the left. The upper end of the first segment 51 and the upper end of the second segment 52 are connected, thus forming an angle between the extending directions of the first segment 51 and the second segment 52. When the spray pipe 3... When the solution flows into the falling film tube 1 and drips onto the first guide element 5, a portion of the solution will flow along the first section 51 and another portion will flow along the second section 52. This allows the solution to diffuse axially and circumferentially in the first section 15, effectively improving the circumferential wetting performance of the first section 15 of the falling film tube 1, increasing the gas-liquid contact time, and effectively improving the mass transfer performance. In addition, the arrangement of the first section 51 and the second section 52 can ensure the flow of liquid, improve the liquid flow disturbance capability during the falling film process, prevent the formation of a stable thermal boundary layer on the outer surface of the falling film tube 1, and improve the heat transfer performance of the falling film tube 1.

[0067] In some embodiments, the falling film absorber 100 further includes a second guide member 6, which is disposed on the second portion 16. The second guide member 6 includes a third segment 61 and a fourth segment 62 connected to each other, with the extension directions of the third segment 61 and the fourth segment 62 forming an angle. There are multiple second guide members 6, which are arranged at intervals along the axial and / or circumferential directions of the falling film tube 1. Specifically, as shown... Figure 9 and Figure 11 As shown, the second drainage element 6 can be disposed on the outer peripheral surface of the second part 16. Multiple second drainage elements 6 are spaced apart in the circumferential direction of the falling film pipe 1 to form multiple rows. Each row of second drainage elements 6 includes several second drainage elements 6 spaced apart in the left-right direction. Each second drainage element 6 includes a third segment 61 and a fourth segment 62 connected to each other. The third segment 61 extends from top to bottom and tilts to the right, while the fourth segment 62 extends from top to bottom and tilts to the left. The upper ends of the third segment 61 and the fourth segment 62 are connected, thus forming an angle between the extending directions of the third segment 61 and the fourth segment 62. When the spray pipe 3... When the solution flows into the falling film tube 1 and drips onto the second inlet 6, a portion of the solution flows along the third section 61 and another portion flows along the fourth section 62. This allows the solution to diffuse axially and circumferentially in the second part 16, effectively improving the circumferential wetting performance of the second part 16 of the falling film tube 1, increasing the gas-liquid contact time, and effectively improving the mass transfer performance. In addition, the arrangement of the third section 61 and the fourth section 62 can ensure the flow of liquid, improve the liquid flow disturbance capability during the falling film process, prevent the formation of a stable thermal boundary layer on the outer surface of the falling film tube 1, and improve the heat transfer performance of the falling film tube 1.

[0068] It is understood that the embodiments of the present invention do not impose any restrictions on the size, dimensions, or included angle of the first drainage element 5 and the second drainage element 6, and can be set according to the actual situation.

[0069] In some embodiments, the first drainage member 5 and the second drainage member 6 are symmetrically arranged in a first direction. Specifically, as shown in the figure... Figure 9 and Figure 11As shown, the first drainage element 5 on the first part 15 and the second drainage element 6 on the second part 16 are symmetrically arranged in the front-back direction. The openings of the first drainage element 5 and the second drainage element 6 at the upper end of the falling film tube 1 are arranged opposite to each other, while the openings of the first drainage element 5 and the second drainage element 6 at the lower section of the falling film tube 1 are arranged opposite to each other. Thus, the opening directions of the first drainage element 5 and the second drainage element 6 are opposite to the liquid flow direction, preventing liquid from accumulating in the openings of the first drainage element 5 or the second drainage element 6. When liquid drips onto the upper end of the falling film tube 1, the liquid flowing to the first part 15 will flow smoothly towards the bottom of the falling film tube 1 through the first drainage element 5, and the liquid flowing to the second part 16 will flow smoothly towards the bottom of the falling film tube 1 through the second drainage element 6, thereby ensuring that the liquid is evenly distributed on the falling film tube 1, making the arrangement of the first drainage element 5 and the second drainage element 6 more reasonable.

[0070] In some embodiments, the first drainage member 5 further includes a fifth segment 53, which is located at the intersection of the first segment 51 and the second segment 52, and extends in a direction away from the openings of the first segment 51 and the second segment 52. The second drainage member 6 further includes a sixth segment 63, which is located at the intersection of the third segment 61 and the fourth segment 62, and extends in a direction away from the openings of the third segment 61 and the fourth segment 62. Specifically, as Figure 7 , Figure 9 and Figure 11 As shown, the fifth segment 53 is located at the upper end of the connection between the first segment 51 and the second segment 52, and the extension direction of the fifth segment 53 is consistent with the flow direction of the liquid, so that the first guide element 5 is roughly in the shape of a "V". When the liquid drips onto the first guide element 5, the liquid will be divided into two parts by the fifth segment 53, so that one part of the liquid flows to the left side of the first guide element 5 and flows along the first segment 51 to the lower first guide element 5, and the other part of the liquid flows to the right side of the first guide element 5, so that the other part of the liquid flows along the second segment 52 to the lower first guide element 5. This prevents the liquid from flowing into the first guide element 5. The liquid flows directly into the opening of the first guide element 5, which ensures the efficiency of the liquid flow outside the first segment 51 and the second segment 52, increases the liquid film disturbance, makes the gas and liquid fully contact, and improves the mass transfer coefficient.

[0071] In some embodiments, the first drainage element 5 further includes a sixth segment 63, which is located at the upper end of the third segment 61 and the fourth segment 62, and the extension direction of the sixth segment 63 is consistent with the flow direction of the liquid, so that the second drainage element 6 is generally in the shape of a "V". Thus, when the liquid drips onto the second drainage element 6, the liquid will be divided into two parts by the sixth segment 63, so that one part of the liquid flows to the left side of the second drainage element 6 and flows along the third segment 61 to the lower second drainage element 6, and the other part of the liquid flows to the right side of the second drainage element 6, so that the other part of the liquid flows along the fifth segment 53 to the lower second drainage element 6. This prevents the liquid from flowing into the second drainage element 6. The liquid flows directly into the opening of the second drainage element 6, ensuring the efficiency of the liquid flow outside the third segment 61 and the fourth segment 62, which can increase the liquid film disturbance, make the gas and liquid fully contact, and improve the mass transfer coefficient.

[0072] In some embodiments, the fifth segment 53 of the first drainage member 5 and its adjacent sixth segment 63 of the second drainage member 6 are spaced apart in the axial direction of the falling film tube 1. Specifically, as Figure 9 As shown, the fifth segment 53 of the first guide member 5 located at the upper end of the falling film tube 1 and the sixth segment 63 of the second guide member 6 located at the upper end of the falling film tube 1 are spaced apart in the left and right direction. This ensures that when liquid drips onto the upper end of the falling film tube 1, the liquid is evenly distributed on the first part 15 and the second part 16 of the falling film tube 1 through the fifth segment 53 and the sixth segment 63, thereby improving the heat exchange efficiency of the falling film tube 1.

[0073] In some embodiments, the first segment 51 of the first drainage member 5 is connected to the third segment 61 of the adjacent second drainage member 6, and / or the second segment 52 of the first drainage member 5 is connected to the fourth segment 62 of the adjacent second drainage member 6, and the openings of the first drainage member 5 and the second drainage member 6 are staggered. Specifically, as Figure 11 As shown, the first drainage member 5 and the second drainage member 6 located at the lower end of the falling film tube 1 can be configured according to actual conditions. For example, the first segment 51 of the first drainage member 5 located at the lower end of the falling film tube 1 and the third segment 61 of the second drainage member 6 located at the lower end of the falling film tube 1 are connected, and the second segment 52 of the first drainage member 5 located at the lower end of the falling film tube 1 and the fourth segment 62 of the second drainage member 6 located at the lower end of the falling film tube 1 are spaced apart in the left and right directions.

[0074] Alternatively, the second segment 52 of the first drainage member 5 located at the lower end of the falling film tube 1 and the fourth segment 62 of the second drainage member 6 located at the lower end of the falling film tube 1 are connected, and the first segment 51 of the first drainage member 5 located at the lower end of the falling film tube 1 and the third segment 61 of the second drainage member 6 located at the lower end of the falling film tube 1 are spaced apart in the left-right direction.

[0075] Alternatively, the second section 52 of the first drainage member 5 located at the lower end of the falling film tube 1 is connected to the fourth section 62 of the second drainage member 6 located at the lower end of the falling film tube 1, and the first section 51 of the first drainage member 5 located at the lower end of the falling film tube 1 is connected to the third section 61 of the second drainage member 6 located at the lower end of the falling film tube 1. This reduces the accumulation of solution at the bottom of the falling film tube 1, makes it evenly distributed, and ensures the falling film quality of the lower falling film tube 1.

[0076] In some embodiments, a plurality of first drainage elements 5 are formed in multiple rows in the circumferential direction of the falling film tube 1. Each row of first drainage elements 5 includes a plurality of first drainage elements 5 spaced apart along the axial direction of the falling film tube 1, and adjacent rows of first drainage elements 5 are staggered in the axial direction of the falling film tube 1. Specifically, as shown in... Figure 7-11 As shown, the two adjacent rows of first drainage members 5 include an upper row of first drainage members 5 and a lower row of first drainage members 5. The lower row of first drainage members 5 is located between the two adjacent upper row of first drainage members 5. In other words, the fifth segment 53 of the lower row of first drainage members 5 is located between the free end of the first segment 51 of the upper row of first drainage members 5 and the free end of the second segment 52 of the adjacent upper row of first drainage members 5 in the left-right direction. As a result, the liquid in the first segment 51 of the upper row of first drainage members 5 and the liquid in the third segment 61 of the upper row of first drainage members 5 flow into the first segment 51 of the lower row of first drainage members 5, so that the liquid is evenly distributed on the first part 15 of the falling film tube 1.

[0077] In some embodiments, a plurality of second drainage elements 6 are formed in multiple rows in the circumferential direction of the falling film tube 1. Each row of second drainage elements 6 includes a plurality of second drainage elements 6 spaced apart along the axial direction of the falling film tube 1, and adjacent rows of second drainage elements 6 are staggered in the axial direction of the falling film tube 1. Specifically, as shown in... Figure 7-11 As shown, the two adjacent rows of second drainage members 6 include an upper row of second drainage members 6 and a lower row of second drainage members 6. The lower row of second drainage members 6 is located between two adjacent upper row of second drainage members 6. In other words, the sixth segment 63 of the lower row of second drainage members 6 is located between the free end of the third segment 61 of the upper row of second drainage members 6 and the free end of the fourth segment 62 of the upper row of second drainage members 6, so that the liquid in the third segment 61 and the liquid in the fourth segment 62 of the upper row of second drainage members 6 flows into the sixth segment 63 of the lower row of second drainage members 6, thereby making the liquid evenly distributed on the second part 16 of the falling film tube 1.

[0078] In some embodiments, the free end of the first segment 51 of the first drainage member 5 extends along the axial direction of the falling film tube 1 and away from the second segment 52 of the first drainage member 5; the free end of the second segment 52 of the first drainage member 5 extends along the axial direction of the falling film tube 1 and away from the first segment 51 of the first drainage member 5; the free end of the third segment 61 of the second drainage member 6 extends along the axial direction of the falling film tube 1 and away from the fourth segment 62 of the second drainage member 6; and the free end of the fourth segment 62 of the second drainage member 6 extends along the axial direction of the falling film tube 1 and away from the third segment 61 of the second drainage member 6. Specifically, the free ends of the first segment 51 and the second segment 52 of the first drainage member 5 are both horizontal segments, and the free ends of the third segment 61 and the fourth segment 62 of the second drainage member 6 are both horizontal segments. This improves the axial wettability of the falling film tube 1, increases the gas-liquid contact area, increases the solution residence time, and improves the mass transfer coefficient of the falling film tube 1.

[0079] In some embodiments, the extension directions of the first segment 51 of the multiple rows of first drainage members 5 intersect to form a first straight line, and the first straight line intersects with the second direction at an angle. The extension directions of the second segment 52 of the multiple rows of first drainage members 5 intersect to form a second straight line, and the second straight line intersects with the second direction at an angle. The extension directions of the third segment 61 of the multiple rows of second drainage members 6 intersect to form a third straight line, and the third straight line intersects with the second direction at an angle. The extension directions of the fourth segment 62 of the multiple rows of second drainage members 6 intersect to form a fourth straight line, and the fourth straight line intersects with the second direction at an angle. In the axial projection plane orthogonal to the falling film tube 1, the first direction is orthogonal to the second direction, and the angles between the first straight line, the second straight line, the third straight line, and the fourth straight line and the second direction are equal.

[0080] Specifically, the second direction is the vertical direction. In the vertical direction, the extension of the first segment 51 of each row of first drainage elements 5 can extend along the first straight line, thereby forming a first straight line with the first segment 51 of multiple rows of first drainage elements 5. The extension of the second segment 52 of each row of first drainage elements 5 can extend along the second straight line, thereby forming a second straight line with the second segment 52 of multiple rows of first drainage elements 5. The extension of the third segment 61 of each row of second drainage elements 6 can extend along the third straight line, thereby forming a third straight line with the third segment 61 of multiple rows of second drainage elements 6. The extension of the fourth segment 62 of each row of second drainage elements 6 can extend along the fourth straight line, thereby forming a fourth straight line with the fourth segment 62 of multiple rows of second drainage elements 6. This allows the liquid on the first part 15 to move along the first and second straight line directions, and the liquid on the second part 16 to flow along the third and fourth straight lines, thereby maximizing the uniform distribution of liquid on the falling film tube 1 and ensuring the mass transfer coefficient of the falling film tube 1.

[0081] In some embodiments, the falling film absorber 100 further includes a first plate 18 and a second plate 19, which are spaced apart on the falling film tube 1 along a second direction. The height or thickness of the first plate 18 is not equal to the height or thickness of the second plate 19. Specifically, as Figure 6 , Figure 8 and Figure 10 As shown, there are two first plates 18, which are respectively disposed on the upper end face of the falling film tube 1 and located on the left and right ends of the falling film tube 1. There are two second plates 19, which are respectively disposed on the lower end face of the falling film tube 1 and located on the left and right ends of the falling film tube 1. The height of the first plate 18 and the height of the second plate 19 are not equal, or the thickness of the first plate 18 and the thickness of the second plate 19 are not equal. Thus, the upper end and the lower end of the falling film tube 1 can be distinguished by the arrangement of the first plate 18 and the second plate 19.

[0082] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to 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, they should not be construed as limitations on this invention.

[0083] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0084] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0085] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0086] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0087] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. A falling film absorber, characterized in that, include: The housing has a chamber, an air inlet, and an air outlet. The air inlet is located at the bottom of the housing, and the air outlet is located at the top of the housing. Both the air outlet and the air inlet are in communication with the chamber. A falling film tube is disposed within the housing. The falling film tube comprises a plurality of sequentially connected sub-tubes, which are spaced apart along the height direction of the housing. A spray pipe is disposed inside the housing above the falling film pipe. The spray pipe has multiple spray nozzles, which are arranged facing the side adjacent to the falling film pipe and spaced apart along the axial direction of the spray pipe. A replenishment pipe is disposed inside the housing and spaced apart from the spray pipe along the height direction of the housing. The replenishment pipe is located below the spray pipe. At least a portion of the sub-pipes are located between the spray pipe and the replenishment pipe, and another portion of the sub-pipes are located below the replenishment pipe. The replenishment pipe has multiple replenishment ports, which are arranged facing away from the spray pipe and spaced apart along the axial direction of the replenishment pipe. It also includes a flow-dispersing assembly, which includes a first annular body and a plurality of flow-dispersing plates. The first annular body and the flow-dispersing plates are both disposed inside the falling film tube. The flow-dispersing plates are wavy. The plurality of flow-dispersing plates are connected to the first annular body and are spaced apart along the circumference of the first annular body. The plurality of flow-dispersing plates are located at one end of the first annular body away from the inlet of the falling film tube. At least a portion of the flow-dispersing plates is in contact with the inner circumferential surface of the falling film tube body so that when coolant flows into the falling film tube, the flow-dispersing plates vibrate to disturb the thermal boundary layer on the inner circumferential surface of the falling film tube. The turbulence-disrupting component further includes a second annular body and a stiffener. The second annular body is sleeved on the outer periphery of the first annular body, and the outer periphery of the first annular body and the inner periphery of the second annular body are spaced apart to form a channel. The stiffener is disposed between the first annular body and the second annular body, and the stiffener is connected to the first annular body and the second annular body respectively, so that the second annular body is disposed on the first annular body. The first annular body includes a first part and a second part that are connected to each other. The second part is located at the end of the first part away from the inlet, and the outer diameter of the first part gradually decreases along the direction adjacent to the inlet.

2. The falling film absorber according to claim 1, characterized in that, The fluid replenishment tube includes a first tube and a second tube. The first tube is sleeved over the second tube. The first tube has a plurality of first ports, which are spaced apart along the axial direction of the first tube. The second tube has a plurality of second ports, which are spaced apart along the axial direction of the second tube. The distance between two adjacent second ports is the same as the distance between two adjacent first ports. At least a portion of the first port is connected to the second port to form the fluid replenishment port.

3. The falling film absorber according to claim 2, characterized in that, One of the first tube and the second tube may be movable in the axial direction relative to the other of the first tube and the second tube in order to adjust the size of the inlet.

4. The falling film absorber according to claim 2, characterized in that, One of the first tube and the second tube is rotatable relative to the other of the first tube and the second tube in order to adjust the size of the inlet.

5. The falling film absorber according to claim 1, characterized in that, It also includes a connecting member, one end of which is connected to the spray pipe and the other end of which is connected to the replenishment pipe, so that the liquid in the spray pipe flows into the replenishment pipe.

6. The falling film absorber according to claim 1, characterized in that, It also includes a mounting bracket, which is disposed within the housing, and each of the plurality of sub-pipes, the spray pipe and the replenishment pipe is disposed on the mounting bracket.

7. The falling film absorber according to claim 1, characterized in that, The falling film tube has a first part and a second part arranged sequentially in a first direction, and the two ends of the first part are respectively connected to the two ends of the second part. The falling film absorber further includes a first draining element and a second draining element. The first draining element is disposed on the first part and includes a first segment and a second segment connected to each other. The extension direction of the first segment and the extension direction of the second segment form an angle. There are multiple first draining elements, which are arranged at intervals along the axial and / or circumferential direction of the falling film tube. The second draining element is disposed on the second part and includes a third segment and a fourth segment connected to each other. The extension direction of the third segment and the extension direction of the fourth segment form an angle. There are multiple second draining elements, which are arranged at intervals along the axial and / or circumferential direction of the falling film tube.

Images