Regeneration tower with built-in falling film reboiler

Abstract

The invention relates to a regeneration tower with a built-in falling film reboiler. The regeneration tower comprises a tower body, and a filler layer, a liquid collecting device, a film forming device and a diaphragm plate heat exchanger which are sequentially arranged in the tower body from top to bottom, the liquid collecting device comprises a partition plate connected to the inner wall of the tower body and a plurality of ascending barrels arranged on the partition plate, and through holes are formed in the bottoms, corresponding to the ascending barrels, of the partition plate; a liquid collecting tank is formed in an area between the rising barrels above the partition plate; the diaphragm plate heat exchanger comprises a medium pipeline and a plurality of heat exchange plates with vertically arranged plate surfaces, and the medium pipeline is used for introducing a heat exchange medium into the heat exchange plates; and the film forming device can be communicated with the liquid collecting tank and is configured to guide liquid in the liquid collecting tank to distribute a film on the plate surface of the heat exchange plate. The heat exchange efficiency can be effectively improved, the regeneration energy consumption is reduced, and the occupied area and investment are reduced.

Description

Technical Field

[0001] The present invention relates to the field of CO2 capture, and in particular to a regeneration tower with a built-in falling film reboiler. Background Art

[0002] Currently, chemical absorption is the primary method for achieving large-scale carbon capture. Its process system is primarily divided into two parts: absorption and desorption. The desorption process requires external heat to heat and regenerate the CO2 absorbed in the chemical absorbent. The heat required for the desorption and regeneration process is generally provided by a reboiler at the bottom of the tower. The rich liquid in the desorption tower kettle enters the reboiler, where steam is used to heat the rich liquid, vaporizing 25%-30% of the water in the rich liquid while simultaneously desorbing the CO2, resulting in a mixed gas phase (H2O(g) and CO2). This mixed gas phase rises into the packing section of the desorption tower to heat the rich liquid within the tower. Therefore, the desorption process is the most energy-intensive part of the entire CO2 capture system, accounting for approximately 80% of the total energy consumption.

[0003] As a key device for providing heat for CO2 regeneration, the performance of the reboiler will directly affect the regeneration energy consumption and investment cost. Conventional reboilers mainly include kettle reboilers, thermosyphon reboilers, and falling film reboilers. These types of reboilers are all shell and tube structures, with the hot side medium steam flowing through the tubes and the cold side medium rich liquid flowing through the shell. Most of them are arranged as separate heat exchange equipment outside the desorption tower. Compared with plate heat exchangers, these types of reboilers occupy a larger area, have lower heat transfer efficiency, and consume a lot of steam. Although the falling film reboiler can form a film of rich liquid in the heat exchange tube, which can improve the heat transfer coefficient to a certain extent, its size and floor space are very large in large-scale carbon capture equipment, and the investment cost is relatively high.

[0004] Plate reboilers offer 2-4 times higher heat transfer efficiency than traditional tubular heat exchangers. The plates are designed with corrugations to create flow channels, enhancing turbulent flow at very low flow rates and enhancing heat transfer. Furthermore, the turbulent flow has a self-cleaning effect, preventing fouling and reducing thermal resistance, resulting in very high heat transfer efficiency. Furthermore, due to its compact structure and small size, the heat exchanger's surface area is minimal, resulting in minimal heat loss. With the same heat transfer coefficient, a plate heat exchanger can reduce resistance loss to within one-third of that of a shell-and-tube heat exchanger by properly selecting the flow rate. Due to its extremely compact structure, a plate heat exchanger requires only one-half to one-third the area of ​​a shell-and-tube heat exchanger to achieve the same heat transfer efficiency, occupying only one-half to one-third the space of a shell-and-tube heat exchanger, even with equal heat transfer capacity. No extensive maintenance space is required; simply loosening the clamping screws allows 100% access to the heat exchanger plate surface within the original space. Disassembly and assembly are also very convenient, as are cleaning.

[0005] Conventional plate reboilers are placed outside the desorption tower. The rich liquid falling from the packing section flows through the pipeline out of the desorption tower and into the reboiler by gravity or siphon action. In this case, the reboiler can be understood as a heat exchange space divided into multiple channels by multiple plates and sealing gaskets. The hot and cold fluids alternate and countercurrently pass through their respective channels for efficient heat exchange. The heat exchange channels of the hot and cold fluids are completely independent and closed. For the regeneration of CO2 absorption rich liquid, the gas-liquid two-phase mixture (105°C) after the rich liquid is desorbed is returned to the desorption tower for gas-liquid separation. The gas phase ascends in the packing section for mass and heat transfer with the descending rich liquid; the liquid phase is extracted from the tower kettle as lean liquid and returned to the absorption tower for recycling.

[0006] Patent CN104772007B proposes a reboiler and a regeneration tower, in which the reboiler is disposed inside the regeneration tower. However, the reboiler adopts a tubular heat exchanger or a heating coil, which has a low heat transfer coefficient and high energy consumption.

[0007] Patent CN204939418U proposes a regeneration tower for a natural gas purification skid. Compared to traditional distributed regeneration tower processes, this technology integrates the reboiler within the tower kettle, reducing the space required for the external reboiler and its connecting piping. This reduces the number of pipes and valves required to connect the reboiler to the tower kettle, thereby minimizing heat loss. However, this patent also uses a tubular heat exchanger, using thermal oil to heat the rich liquid, resulting in a low heat transfer coefficient and high energy consumption.

[0008] Patent CN113198188A proposes a falling-film reboiler for CO2 desorption. By providing a liquid distributor, the uniformity of liquid film formation on the heat exchange tube wall is ensured. Internal turbulents within the heat exchange tube create traction and strong swirl, thinning the liquid film. Simultaneously, the internal turbulents induce secondary flow, promoting radial mixing, thereby improving heat and mass transfer efficiency, reducing regeneration energy consumption during CO2 desorption, and increasing the absorbent's circulation capacity. Although this patent utilizes a falling-film structure and increases the heat transfer coefficient, the heat exchange tubes are tubular heat exchangers. While swirl is used to increase film uniformity, it fails to eliminate voids in the center of the tube, resulting in a large dead space and increased resistance and energy consumption.

[0009] Patent CN207379338U proposes a falling film plate heat exchanger that improves heat exchange efficiency by installing nozzles between the plates. Furthermore, grid-like fillers are provided between adjacent plates to support the plates, increase their pressure resistance, and prevent deformation, thereby ensuring the stability of the heat exchanger. The patent has a simple structure and a long service life, and solves the problems of uneven spraying and easy deformation of the plates under pressure. Although this patent uses a plate structure, the filler increases the thickness of the plates, reducing heat exchange efficiency. Furthermore, using multiple nozzles to achieve film formation is difficult and has poor uniformity. Summary of the Invention

[0010] The object of the present invention is to provide a regeneration tower with a built-in falling film reboiler, which can effectively improve the heat exchange efficiency, reduce the regeneration energy consumption, and reduce the floor space and investment.

[0011] The object of the present invention is achieved in this way. A regeneration tower with a built-in falling film reboiler includes a tower body and a packing layer, a liquid collecting device, a film forming device and a membrane plate heat exchanger arranged in sequence from top to bottom in the tower body; the liquid collecting device includes a partition connected to the inner wall of the tower body and a plurality of rising tubes arranged on the partition, and through holes are opened on the partition corresponding to the bottom of each rising tube; the area between the rising tubes above the partition forms a liquid collecting tank; the membrane plate heat exchanger includes a medium pipeline and a plurality of heat exchange plates arranged vertically on the plate surface, and the medium pipeline is used to pass heat exchange medium into the interior of the heat exchange plate; the film forming device can be connected to the liquid collecting tank, and is configured to guide the liquid in the liquid collecting tank to form a film on the plate surface of the heat exchange plate.

[0012] In a preferred embodiment of the present invention, the film forming device includes a guide tube group and a plurality of film forming parts, and a film forming channel is formed inside the film forming parts. The guide tube group is used to guide the liquid in the liquid collecting tank to the upper inlet of each film forming channel, and a gap is formed between the lower outlet of the film forming channel and the corresponding plate surface of the corresponding heat exchange plate.

[0013] In a preferred embodiment of the present invention, the film-forming member is a box structure having a socket at the lower end, and the guide tube group is connected to the top of the box structure; the top of the heat exchange plate extends into the box structure through the socket, and gaps are formed between the socket and the two side plate surfaces of the heat exchange plate; the top of the heat exchange plate is located in the box structure, or the top of the heat exchange plate passes through the top of the box structure.

[0014] In a preferred embodiment of the present invention, the lower portions of the two side plates located on both sides of the heat exchange plate in the box structure are inclined and extend downward to form an inclined baffle that gradually approaches the heat exchange plate. The area between the lower ends of the two inclined baffles in the box structure constitutes a socket, and a gap is formed between the lower ends of the inclined baffles and the corresponding plate surfaces of the heat exchange plate.

[0015] In a preferred embodiment of the present invention, the guide pipe group includes multiple groups of guide structures, each group of guide structures includes two guide parts, and a guide channel is formed in each guide part. The lower end outlets of the two guide channels in each group of guide structures are connected to the top of the same film forming part and are respectively located on both sides of the heat exchange plate.

[0016] In a preferred embodiment of the present invention, the guide pipe group further includes a plurality of mother pipes, each mother pipe being connected to the upper inlets of two guide channels in the same guide structure.

[0017] In a preferred embodiment of the present invention, the medium pipeline includes multiple medium inlet pipes and multiple medium outlet pipes, and the medium inlet pipes and the medium outlet pipes both pass through the corresponding heat exchange plates and are connected to the interior of the heat exchange plates; the top of the heat exchange plate passes through the top of the box structure, the medium outlet pipe is located above the film forming member, and the medium inlet pipe is arranged near the bottom of the heat exchange plate; each guide member includes at least one branch member, and each branch member connects the main pipe and the film forming member; each heat exchange plate is connected to a medium outlet pipe, each guide member includes two branch members, and the medium outlet pipe passes between the two branch members; or, each heat exchange plate is connected to multiple medium outlet pipes, and each branch member passes between two adjacent medium outlet pipes.

[0018] In a preferred embodiment of the present invention, the film-forming member is a hollow sheet structure, which includes a first side sheet and a second side sheet arranged in parallel and spaced apart, the plate surfaces of the first side sheet and the second side sheet are parallel to the plate surface of the heat exchange plate, the first side sheet is arranged close to the corresponding plate surface of the heat exchange plate, and the lower part of the second side sheet extends downwardly at an angle to form an inclined baffle gradually approaching the heat exchange plate, and a gap is formed between the lower end of the inclined baffle and the corresponding plate surface of the heat exchange plate.

[0019] In a preferred embodiment of the present invention, the guide tube group includes multiple mother tubes, each mother tube is connected to the upper end inlet of the film forming channel on one side of the heat exchange plate, or each mother tube is connected to the upper ports of the two film forming channels between two adjacent heat exchange plates.

[0020] In a preferred embodiment of the present invention, the medium pipeline includes multiple medium inlet pipes and multiple medium outlet pipes, and the medium inlet pipes and the medium outlet pipes both pass through the corresponding heat exchange plates and are connected to the interior of the heat exchange plates; the medium inlet pipe is arranged near the bottom of the heat exchange plate, and the medium outlet pipe is arranged near the top of the heat exchange plate; each main pipe is connected to the membrane forming member through a guide member, and each guide member includes at least one branch member, and each branch member connects the main pipe and the membrane forming member; each heat exchange plate is connected to a medium outlet pipe, and each guide member includes two branch members, and the medium outlet pipe passes between the two branch members; or, each heat exchange plate is connected to multiple medium outlet pipes, and each branch member passes between two adjacent medium outlet pipes.

[0021] In a preferred embodiment of the present invention, the main pipe is connected to the liquid collecting tank through a connecting pipe.

[0022] In a preferred embodiment of the present invention, a delivery pump is further provided on the outside of the tower body, and the guide pipe group further includes a circulation pipe group, which is connected to the delivery pump and each main pipe to pump the liquid in the liquid collecting tank into each film forming channel.

[0023] In a preferred embodiment of the present invention, the edge of the lower outlet of the film-forming channel forms a serrated flow-guiding structure, and a texture structure is formed on the plate surface of the heat exchange plate.

[0024] In a preferred embodiment of the present invention, the film forming device includes a plurality of main pipes and a circulation pipe group, each main pipe is arranged between two adjacent heat exchange plates, and two groups of nozzle assemblies are provided on both sides of the main pipe. Each group of nozzle assemblies includes a plurality of nozzles arranged at intervals along the length direction of the main pipe, and the nozzles of the nozzles are arranged toward the corresponding plate surfaces of the heat exchange plates; a delivery pump is also provided on the outside of the tower body, and the circulation pipe group is connected to the delivery pump and each main pipe to pump the liquid in the liquid collecting tank into each main pipe.

[0025] In a preferred embodiment of the present invention, the membrane plate heat exchanger includes a plurality of heat exchange plate groups arranged side by side along a first horizontal direction, each heat exchange plate group includes a plurality of heat exchange plates arranged side by side along a second horizontal direction, and the plate surfaces of the heat exchange plates are parallel to the first horizontal direction and perpendicular to the second horizontal direction; a plurality of heat exchange medium inlets and a plurality of heat exchange medium outlets are provided on the side wall of the tower body; the medium pipeline includes a plurality of heat exchange pipelines, each heat exchange pipeline group includes at least one medium inlet pipe and at least one medium outlet pipe; each medium inlet pipe and each medium outlet pipe in each heat exchange pipeline group are connected to each heat exchange plate in the same heat exchange plate group; each medium inlet pipe in each heat exchange pipeline group is connected to the same heat exchange medium inlet, and each medium outlet pipe is connected to the same heat exchange medium outlet.

[0026] In a preferred embodiment of the present invention, a plurality of supporting ribs are provided in the heat exchange plate, and the length direction of the supporting ribs is perpendicular to the plate surface of the heat exchange plate.

[0027] In a preferred embodiment of the present invention, an air lift cap is provided at the top opening of the riser to prevent liquid from entering the riser.

[0028] In a preferred embodiment of the present invention, the lifting cap includes a V-shaped plate with the notch facing upward, and gaps are left between the two plate bodies of the V-shaped plate and the top opening of the rising cylinder.

[0029] In a preferred embodiment of the present invention, a gas phase outlet and a liquid phase outlet are respectively provided at the top and bottom of the tower body, and a liquid phase inlet, a heat exchange medium outlet and a heat exchange medium inlet are respectively provided on the side wall of the tower body from top to bottom, the liquid phase inlet is located above the packing layer, and the heat exchange medium outlet and the heat exchange medium inlet are connected to the medium pipeline.

[0030] As described above, the present invention combines the advantages of high heat transfer efficiency of plate heat exchangers and falling film reboilers, and embeds the film-forming device and membrane plate heat exchanger into the tower body to form a compact, high heat transfer efficiency falling film plate reboiler; the membrane plate heat exchanger of the plate heat exchanger is used to exchange heat for the rich liquid, and the plate heat exchanger is built into the desorption tower kettle, which can greatly reduce the floor space and reduce equipment investment; by setting a film-forming device to form a film on the heat exchange plate, heat transfer is enhanced and regeneration energy consumption is reduced; and compared with the existing film-forming method using a swirl method, which cannot eliminate the voids in the center area of ​​the tube and has a large invalid area, the rich liquid in this application forms a liquid film on the plate surface of the heat exchange plate under the guidance of the film-forming device. The film-forming method is simple, and there are no voids in the center area of ​​the existing tube, so the heat transfer efficiency is higher and the equipment size is smaller. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The following drawings are only intended to illustrate and explain the present invention, and are not intended to limit the scope of the present invention.

[0032] in:

[0033] Figure 1 This is a schematic structural diagram of a regeneration tower with a built-in falling film reboiler in the first embodiment provided by the present invention.

[0034] Figure 2 This is a schematic diagram of the cooperation between the rising tube and the lifting cap provided by the present invention.

[0035] Figure 3 This is a schematic structural diagram of a film forming device in a first embodiment of the present invention using a first film forming method.

[0036] Figure 4 Another structural schematic diagram of the film forming device adopting the first film forming method in the first embodiment provided by the present invention.

[0037] Figure 5 Schematic diagram of the film forming device using the second film forming method in the first embodiment provided by the present invention Figure 1 .

[0038] Figure 6 Schematic diagram of the film forming device using the second film forming method in the first embodiment provided by the present invention Figure 2 .

[0039] Figure 7 A schematic diagram of a first embodiment of the present invention showing that the flow guide member includes a branch member.

[0040] Figure 8 A schematic diagram of a first embodiment of the present invention showing that the flow guide comprises two branch members.

[0041] Figure 9This is a schematic structural diagram of a regeneration tower with a built-in falling film reboiler in the second embodiment provided by the present invention.

[0042] Figure 10 for Figure 9 A partial enlarged view of the nozzle.

[0043] Figure 11 This is a cross-sectional view of the tower body provided by the present invention when it adopts a square cylindrical structure.

[0044] Figure 12 This is a cross-sectional view of the tower body provided by the present invention when it adopts a cylindrical barrel structure.

[0045] Description of Figure Numbers:

[0046] 1. Tower body; 11. Gas phase outlet; 12. Liquid phase inlet; 13. Liquid phase outlet; 14. Heat exchange medium inlet; 15. Heat exchange medium outlet;

[0047] 2. Filling layer;

[0048] 3. Liquid collecting device; 31. Partition; 32. Rising cylinder; 33. Liquid collecting tank; 34. Air lifting cap; 341. V-shaped plate; 342. Support;

[0049] 4. Film-forming device; 41. Film-forming component; 411. Socket; 412. Inclined baffle; 42. Flow guide; 421. Branching component; 43. Main pipe; 44. Connecting pipe; 45. Delivery pump; 46. Liquid phase extraction pipe; 47. Liquid phase return pipe; 471. Branch pipe; 48. Nozzle;

[0050] 5. Membrane plate heat exchanger; 51. Heat exchange plate; 52. Medium inlet pipe; 53. Medium outlet pipe; 54. Support ribs;

[0051] 6. Liquid film. DETAILED DESCRIPTION

[0052] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described with reference to the accompanying drawings.

[0053] It should be noted that, in the description of this application, the terms "first," "second," etc., are used solely for descriptive purposes and to distinguish similar objects. There is no order of precedence between the two, nor should they be understood to indicate or imply relative importance. Furthermore, in the description of this application, unless otherwise specified, "plurality" means two or more.

[0054] like Figures 1 to 12As shown, the present application provides a regeneration tower with a built-in falling film reboiler, comprising a tower body 1 and a packing layer 2, a liquid collecting device 3, a film forming device 4 and a membrane plate heat exchanger 5 arranged in sequence from top to bottom in the tower body 1; the liquid collecting device 3 comprises a partition 31 connected to the inner wall of the tower body 1 and a plurality of rising tubes 32 arranged on the partition 31, and through holes are opened on the partition 31 corresponding to the bottom of each rising tube 32; the area between each rising tube 32 above the partition 31 forms a liquid collecting tank 33; the membrane plate heat exchanger 5 comprises a medium pipeline and a plurality of heat exchange plates 51 arranged vertically on the plate surface, and the medium pipeline is used to pass heat exchange medium into the interior of the heat exchange plate 51; the film forming device 4 can be connected to the liquid collecting tank 33, and is configured to guide the liquid in the liquid collecting tank 33 to form a film on the plate surface of the heat exchange plate 51.

[0055] Therefore, the present application combines the advantages of high heat transfer efficiency of plate heat exchangers and falling film reboilers, and the film forming device 4 and membrane plate heat exchanger 5 are built into the tower body 1 to form a compact, high heat transfer efficiency falling film plate reboiler; the membrane plate heat exchanger 5 of the plate heat exchange is used to exchange heat with the rich liquid, and the plate heat exchanger is built into the desorption tower kettle, which can greatly reduce the floor space and reduce equipment investment; by setting the film forming device 4 to form a film on the heat exchange plate 51, the heat transfer is enhanced and the regeneration energy consumption is reduced; and compared with the existing film forming method using a swirl method, which cannot eliminate the voids in the center area of ​​the tube and has a large invalid area, the rich liquid in the present application forms a liquid film 6 on the plate surface of the heat exchange plate 51 under the guidance of the film forming device 4. The film forming method is simple, and there are no voids in the center area of ​​the existing tube, the heat exchange efficiency is higher, and the equipment size is smaller.

[0056] Furthermore, the packing layer 2 is a structured packing, which is arranged at the upper part of the tower body 1 and specifically includes one or more combinations of corrugated plate packing, grid packing and plate-type packing.

[0057] The tower body 1 can be a hollow cylindrical structure (such as Figure 12 As shown), it can also be a hollow square cylindrical structure (as Figure 11 the shape of the partition 31 matches the cross-sectional shape of the tower body 1, and the partition 31 may be a disc or a square disc structure and is welded and sealed with the inner wall of the tower body 1.

[0058] The riser 32 can be a cylindrical structure with both ends open. Its lower end can be welded to the partition 31 and downwardly penetrate the partition 31 through the aforementioned through-hole to communicate with the area below the partition 31. The areas between the risers 32 are interconnected and form the aforementioned liquid collecting tank 33. The interior of the riser 32 forms a gas rising channel for the desorbed gas to pass through. The specific shape of the riser 32 can be determined according to actual needs. For example, the riser 32 can adopt a rectangular cylindrical structure or a circular cylindrical structure. The bottom of each riser 32 can correspond to one or more through-holes.

[0059] Generally, in order to prevent the liquid falling from the filler from entering the gas rising channel in the rising tube 32, a gas rising cap 34 is provided at the top opening of the rising tube 32 to prevent the liquid from entering the rising tube 32.

[0060] The number of the air lifting caps 34 is the same as the number of the rising tubes 32. The specific structure of the air lifting caps 34 can be designed as needed. For example, in a specific embodiment, the air lifting caps 34 include a V-shaped plate 341 with the notch facing upward, and there is a gap between the two plates of the V-shaped plate 341 and the top opening of the rising tube 32.

[0061] In order to facilitate processing and installation, in this embodiment, refer to Figure 1 and Figure 2 Generally, the rising tube 32 adopts a rectangular cylinder structure. The V-shaped plate 341 can be made of angle steel, for example. Its length direction extends along the length direction of the top opening of the rising tube 32. The two ends of the V-shaped plate 341 can be fixed to the two ends of the rising tube 32 through corresponding supports 342.

[0062] Optionally, the length direction of the V-shaped plate 341 is inclined relative to the horizontal direction. The inclination angle can be relatively small, so that the V-shaped plate 341 has a certain inclination slope. Liquid falling into the V-shaped groove at the top of the V-shaped plate 341 can also flow from high to low along the length direction of the V-shaped plate 341 to flow into the liquid collecting tank 33.

[0063] Furthermore, a gas phase outlet 11 and a liquid phase outlet 13 are respectively provided at the top and bottom of the tower body 1, and a liquid phase inlet 12, a heat exchange medium outlet 15 and a heat exchange medium inlet 14 are respectively provided on the side wall of the tower body 1 from top to bottom. The liquid phase inlet 12 is located above the packing layer 2, and the heat exchange medium outlet 15 and the heat exchange medium inlet 14 are connected to the medium pipeline for introducing the heat exchange medium (i.e., the heat medium) into the interior of the heat exchange plate 51.

[0064] During use, the working principle is as follows: rich liquid from the absorption tower enters the regeneration tower through the liquid phase inlet 12. After mass and heat transfer with the ascending gas phase on the packing, the rich liquid enters the liquid collecting tank 33 of the liquid collecting device 3. It then enters the film forming device 4. Under the guidance of the film forming device 4, it spreads on the surface of the heat exchange plate 51 and forms a liquid film 6. At this time, the heat medium flowing through the heat exchange plate 51 fully exchanges heat with the liquid film 6. After the rich liquid is heated, the absorbed CO2 is released and ascends through the gaps in the film forming device 4 into the rising tube 32 of the liquid collecting device 3. It then passes through the packing and exits the regeneration tower through the gas phase outlet 11. After the above heating process, the rich liquid is regenerated into lean liquid, which is then discharged from the regeneration tower through the liquid phase outlet 13.

[0065] Furthermore, in order to improve the uniformity of film formation, the following two implementation methods can be adopted:

[0066] First embodiment: Refer to Figures 1 to 8 The film forming device 4 includes a guide pipe group and multiple film forming parts 41. A film forming channel is formed inside the film forming part 41. The guide pipe group is used to guide the liquid in the liquid collecting tank 33 to the upper inlet of each film forming channel. A gap is formed between the lower outlet of the film forming channel and the corresponding plate surface of the corresponding heat exchange plate 51 so that the liquid can flow down smoothly.

[0067] After the rich liquid enters the film-forming channel from the liquid collecting tank 33 through the guide tube assembly, it flows out through the gap between the lower outlet of the film-forming channel and the corresponding plate surface of the heat exchange plate 51, forming a uniform film on the plate surface. The size of this gap should be determined based on the actual situation, such as the number and length of the heat exchange plates 51, the flow rate of the rich liquid, and the total amount of liquid to be heated. Too large a gap may affect film uniformity, while too small a gap may cause blockage.

[0068] More specifically, in this embodiment, the film forming device 4 can adopt the following two film forming methods:

[0069] The first film forming method: refer to Figure 1 、 Figure 3 and Figure 4 The film-forming member 41 is a box structure with a socket 411 at the lower end, and the guide tube group is connected to the top of the box structure; the top of the heat exchange plate 51 extends into the box structure through the socket 411, and gaps are formed between the socket 411 and the two side plate surfaces of the heat exchange plate 51.

[0070] Among them, one heat exchange plate 51 corresponds to one film forming member 41, and a film forming member 41 is used to form a film on both sides of the heat exchange plate 51. In this way, refer to Figure 3 , the top of the heat exchange plate 51 is located in the box structure, and there is a gap between the top of the heat exchange plate 51 and the top surface of the box structure, so that the top of the heat exchange plate 51 is wrapped in the film forming member 41. Or, refer to Figure 4 The top of the heat exchange plate 51 passes through the top of the box structure. At this time, a corresponding through-hole is opened on the top of the box structure for the top of the heat exchange plate 51 to pass through upward; the heat exchange plate 51 can be tightly attached to the through-hole, or can be welded and fixed, or a sealing gasket can be added to prevent leakage as much as possible.

[0071] Optionally, the lower parts of the two side plates located on both sides of the heat exchange plate 51 in the box structure are inclined and extend downward to form an inclined baffle 412 that gradually approaches the heat exchange plate 51. The area between the lower ends of the two inclined baffles 412 in the box structure constitutes a socket 411, and a gap is formed between the lower end of the inclined baffle 412 and the corresponding plate surface of the heat exchange plate 51.

[0072] Generally, the heat exchange plate 51 is a rectangular plate with a vertical plate surface. The box structure is a rectangular box body and includes two side plates located on both sides of the plate surface of the heat exchange plate 51, two end plates connecting the side ends of the two side plates, and a top plate connecting the top ends of the two side plates. The inclined baffle 412 constitutes a part of the side plate, which can better guide the liquid to the plate surface of the heat exchange plate 51 for film spreading. The box structure is tightly attached to the two side ends of the heat exchange plate 51 (that is, the two end plates of the box structure should be tightly attached to the two side ends of the heat exchange plate 51) to prevent leakage here from affecting the uniformity of film spreading. Optionally, a sealing gasket can be added between the box structure and the two side ends of the heat exchange plate 51, or the two end plates of the box structure can be welded to the two side ends of the heat exchange plate 51 to prevent leakage here.

[0073] For further optional reference, see Figure 3 and Figure 4 The guide pipe group includes multiple groups of guide structures, each group of guide structures includes two guide parts 42, and a guide channel is formed in each guide part 42. The lower end outlets of the two guide channels in each group of guide structures are connected to the top of the same film forming part 41, and are respectively located on both sides of the heat exchange plate 51.

[0074] The guide member 42 is a hollow, thin sheet structure, the hollow area of ​​which forms a guide channel. The number of guide structures is the same as the number of heat exchange plates 51, with each heat exchange plate 51 corresponding to two guide members 42. This allows the liquid to flow from both sides of the heat exchange plate 51 to the plate surfaces on both sides of the heat exchange plate 51, which can more finely distribute the liquid flow, facilitate more uniform film distribution on the plate surfaces of the heat exchange plate 51, and further improve heat exchange efficiency and make desorption more uniform. It also prevents the liquid from directly impacting the top of the heat exchange plate 51 and then flowing to the sides of the heat exchange plate 51, causing the liquid flow rate to attenuate, resulting in increasingly uneven film distribution as the film is distributed downward on the plate surfaces of the heat exchange plate 51.

[0075] Further optionally, in order to facilitate processing and installation, the guide pipe group further includes a plurality of mother pipes 43, each mother pipe 43 being connected to the upper inlets of two guide channels in the same guide structure.

[0076] Generally, the length of the main pipe 43 is equal to the length of the guide member 42 and the width of the heat exchange plate 51 in the horizontal direction. The number of the main pipes 43 is equal to the number of the heat exchange plates 51. After the rich liquid enters the main pipe 43, it enters the membrane forming member 41 through the two guide members 42.

[0077] During operation, the rich liquid entering the liquid collecting tank 33 enters the main pipe 43, and enters the same film-forming part 41 after being distributed by the two guide parts 42 of the guide structure. The rich liquid flows out from the lower end outlet of the film-forming channel, and after being evenly distributed through the inclined baffle 412 at the bottom of the film-forming part 41, a liquid film 6 can be formed on the two side surfaces of the heat exchange plate 51.

[0078] Further, refer to Figure 7 and Figure 8 The medium pipeline includes multiple medium inlet pipes 52 and multiple medium outlet pipes 53. The medium inlet pipes 52 and the medium outlet pipes 53 all pass through the corresponding heat exchange plates 51 and communicate with the interior of the heat exchange plates 51. Generally, the medium inlet pipes 52 are arranged near the bottom of the heat exchange plates 51, and the medium outlet pipes 53 are arranged near the top of the heat exchange plates 51 to ensure heat exchange uniformity and improve heat exchange efficiency.

[0079] When the top of the heat exchange plate 51 is located within the box structure, since the medium outlet pipe 53 and the box structure are both close to the top of the heat exchange plate 51, the medium outlet pipe 53 needs to be horizontally passed through the box structure; opposite openings are provided on the two side panels of the box structure for the medium outlet pipe 53 to pass through; at this time, the medium outlet pipe 53 and the opening can be tightly attached, or can be welded and fixed, or a sealing gasket can be added to prevent leakage as much as possible.

[0080] When the top of the heat exchange plate 51 passes through the top of the box structure, since the medium outlet pipe 53 is located above the membrane forming component 41, the medium outlet pipe 53 does not need to pass through the box structure. At this time, each guide member 42 includes at least one branch member 421, and each branch member 421 connects the main pipe 43 and the membrane forming component 41; each heat exchange plate 51 is connected to a medium outlet pipe 53, and each guide member 42 includes two branch members 421, and the medium outlet pipe 53 passes between the two branch members 421; or, each heat exchange plate 51 is connected to multiple medium outlet pipes 53, and each branch member 421 passes between two adjacent medium outlet pipes 53. In this solution, the medium outlet pipe 53 does not directly pass through the film-forming component 41 or the flow guide component 42, but separates the medium outlet pipe 53 from the branch component 421 and the film-forming component 41, which can prevent the medium outlet pipe 53 from directly passing through the flow guide channel or the film-forming channel, so that the rich liquid is heated by the medium outlet pipe 53 in the flow guide channel or the film-forming channel to produce upward CO2 gas. When there is a lot of gas, it is easy to cause the falling rich liquid to be supported, affecting the uniformity of film formation and the heat exchange efficiency.

[0081] The number of medium inlet pipes 52 and medium outlet pipes 53 corresponding to each heat exchange plate 51 can be determined according to the horizontal width of the heat exchange plate 51. The larger the width, the greater the number of medium inlet pipes 52 and medium outlet pipes 53. The number of branch members 421 is determined according to the number of medium outlet pipes 53.

[0082] For example, in a specific example, refer to Figure 7 The bottom of each heat exchange plate 51 is connected to two medium inlet pipes 52, and the top of each heat exchange plate 51 is connected to two medium outlet pipes 53. Each flow guide 42 includes a branch member 421, which has a branch flow channel and connects the main pipe 43 and the flow guide channel. The branch member 421 passes through the two medium inlet pipes 52 without contacting them. In another specific example, referring to Figure 8The bottom of each heat exchange plate 51 is connected to two medium inlet pipes 52, and the top of each heat exchange plate 51 is connected to a medium outlet pipe 53. Each guide member 42 includes two branch members 421, and each branch member 421 has a branch flow channel. These branch flow channels constitute the above-mentioned guide channel. The medium outlet pipe 53 passes through between the two branch members 421 without contacting them.

[0083] The second film forming method: Figure 5 and Figure 6 The film-forming member 41 is a hollow sheet structure, which includes a first side sheet and a second side sheet arranged in parallel and spaced apart. The plate surfaces of the first side sheet and the second side sheet are parallel to the plate surface of the heat exchange plate 51. The first side sheet is arranged close to the corresponding plate surface of the heat exchange plate 51, and the lower part of the second side sheet extends downwardly at an angle to form an inclined baffle 412 that gradually approaches the heat exchange plate 51. A gap is formed between the lower end of the inclined baffle 412 and the corresponding plate surface of the heat exchange plate 51.

[0084] Two end pieces are connected to both ends of the first and second side pieces. The lower end of the first side piece is located above the inclined baffle 412, which forms part of the second side piece and gradually slopes closer to the surface of the heat exchange plate 51, thereby better guiding the liquid onto the surface of the heat exchange plate 51 for film formation.

[0085] In this manner, each film-forming member 41 is located next to the corresponding plate surface of the corresponding heat exchange plate 51; the number of film-forming members 41 may be twice the number of the heat exchange plates 51; or, when the number of the heat exchange plates 51 is large, the plate surface of the heat exchange plate 51 closest to the inner wall of the tower body 1 facing the inner wall of the tower body 1 may not be provided with a film-forming member 41, and only two film-forming members 41 may be provided between two adjacent heat exchange plates 51.

[0086] Optionally, to facilitate processing and installation, the guide tube group includes multiple mother tubes 43, each mother tube 43 is connected to the upper end inlet of the film forming channel on one side of the heat exchange plate 51, or each mother tube 43 is connected to the upper ports of the two film forming channels between two adjacent heat exchange plates 51.

[0087] Generally, the heat exchange plates 51 are rectangular plates with vertical surfaces. The length of the main pipe 43 is equal to the length of the flow guide 42 and the horizontal width of the heat exchange plate 51. When two film-forming members 41 are provided on both sides of each heat exchange plate 51, the area between each two adjacent heat exchange plates 51 corresponds to a main pipe 43, which is connected to the two film-forming members 41 between the two adjacent heat exchange plates 51. A main pipe 43 also corresponds to the area between the heat exchange plate 51 closest to the inner wall of the tower body 1 and the inner wall of the tower body 1, which is connected to a film-forming member 41 between the heat exchange plate 51 and the inner wall of the tower body 1. When no film-forming member 41 is provided on the plate surface of the heat exchange plate 51 closest to the inner wall of the tower body 1 facing the inner wall of the tower body 1, a main pipe 43 can be provided in the area between each two adjacent heat exchange plates 51.

[0088] Further, refer to Figure 7 and Figure 8 The medium pipeline includes multiple medium inlet pipes 52 and multiple medium outlet pipes 53. The medium inlet pipes 52 and the medium outlet pipes 53 both pass through the corresponding heat exchange plates 51 and are connected to the interior of the heat exchange plates 51; the medium inlet pipes 52 are arranged near the bottom of the heat exchange plates 51, and the medium outlet pipes 53 are arranged near the top of the heat exchange plates 51 to ensure heat exchange uniformity and improve heat exchange efficiency.

[0089] Each main pipe 43 is connected to the membrane-forming element 41 via a flow guide 42. Each flow guide 42 includes at least one branch 421, each connecting the main pipe 43 and the membrane-forming element 41. Each heat exchange plate 51 is connected to a medium outlet pipe 53. Each flow guide 42 includes two branch 421, with the medium outlet pipe 53 passing between the two branch 421. Alternatively, each heat exchange plate 51 is connected to multiple medium outlet pipes 53, with each branch 421 passing between two adjacent medium outlet pipes 53. The structure of the flow guide 42 and branch 421 is the same as that of the flow guide 42 and branch 421 in the first membrane-forming method described above, and is a hollow thin sheet structure. The specific number of medium inlet pipes 52 and medium outlet pipes 53 is also determined according to the width of the heat exchange plate 51. In this solution, the medium outlet pipe 53 does not directly penetrate the film-forming member 41 or the flow guide member 42. Instead, the medium outlet pipe 53 is separated from the branch member 421 and the film-forming member 41. This has the same effect as separating the medium outlet pipe 53 from the branch member 421 and the film-forming member 41 in the first film-forming method mentioned above, so as to improve the uniformity of film formation and heat exchange efficiency.

[0090] For the above two film forming methods of the film forming device 4, in order to facilitate the guide pipe group in the film forming device 4 to guide the liquid in the liquid collecting tank 33 to the film forming channel, the following two guiding methods can be adopted:

[0091] The first guidance method: refer to Figures 1 to 6 The main pipe 43 is connected to the liquid collecting tank 33 through the connecting pipe 44.

[0092] In this method, the rich liquid flows by gravity from the liquid collecting tank 33 through the connecting pipe 44, the main pipe 43, and the flow guide 42, into the film forming element 41, and forms a film on the surface of the heat exchange plate 51. Multiple openings are provided on the partition 31 at locations corresponding to the liquid collecting tank 33. The number of openings is the same as the number of connecting pipes 44, and each connecting pipe 44 is connected to a corresponding opening. One main pipe 43 is connected to one or more connecting pipes 44; typically, one main pipe 43 is connected to the liquid collecting tank 33 through multiple connecting pipes 44, which ensures a more uniform liquid flow and promotes more uniform film formation.

[0093] Under this guiding method, for the first film-forming method mentioned above, a film-forming member 41 is wrapped around the upper part of the heat exchange plate 51, and a film can be formed on the two side surfaces of the heat exchange plate 51. The buffer space inside the film-forming member 41 is relatively large, and the rich liquid is more conducive to ensuring the stability of the flow rate when flowing under the action of gravity. It is not easy to cause a large change in the flow rate of the film layer with the change of the liquid level of the upper liquid collecting tank 33, which is conducive to more uniform film formation. For the second film-forming method mentioned above, the film-forming member 41 is a hollow thin sheet structure, and the internal buffer space is relatively small, but the heat exchange plate 51 does not need to be passed through by the film-forming member 41, which can avoid leakage of the heat exchange plate 51 outside the liquid outlet gap when passing through the film-forming member 41. In general, the above two film-forming methods can achieve balanced film formation and ensure a better film-forming effect.

[0094] The second guiding method: A delivery pump 45 is provided outside the tower body 1. The guiding pipe assembly also includes a circulation pipe assembly. The circulation pipe assembly is connected to the delivery pump 45 and each main pipe 43 to pump the liquid in the liquid collection tank 33 into each film-forming channel. The liquid pumping action of the delivery pump 45 can ensure the stability of the film layer flow rate, which is conducive to more uniform film formation.

[0095] There can be one or more delivery pumps 45. The circulation pipe group includes at least one liquid extraction pipe 46 and at least one liquid return pipe 47. The liquid extraction pipe 46 is connected to the liquid collection tank 33 and the delivery pump 45, and the liquid return pipe 47 is connected to the corresponding main pipe 43 and the delivery pump 45 to extract the liquid from the liquid collection tank 33 and pump it into the film forming element 41. The specific number of delivery pumps 45, the number of pipes in the circulation pipe group, and the arrangement and connection method can be determined according to actual processing and layout requirements.

[0096] Furthermore, in the first embodiment, the edge of the lower outlet of the film forming channel forms a serrated flow guide structure, and a texture structure is formed on the plate surface of the heat exchange plate 51 .

[0097] Specifically, the lower edge of the inclined baffle 412 is serrated to evenly distribute the liquid; the outer wall of the heat exchange plate 51 is provided with a fine texture with roughness so that the liquid can be better wetted and spread on its surface; this is more conducive to improving the uniformity of film formation.

[0098] Second embodiment: Refer to Figure 9 and Figure 10 The film forming device 4 includes multiple main pipes 43 and a circulation pipe group. Each main pipe 43 is arranged between two adjacent heat exchange plates 51. Two groups of nozzle assemblies are provided on both sides of the main pipe 43. Each group of nozzle assemblies includes multiple nozzles 48 arranged at intervals along the length direction of the main pipe 43. The nozzles of the nozzles 48 are arranged toward the corresponding plate surfaces of the heat exchange plates 51. A delivery pump 45 is also provided on the outside of the tower body 1. The circulation pipe group is connected to the delivery pump 45 and each main pipe 43 to pump the liquid in the collecting tank 33 into each main pipe 43.

[0099] The axis of the nozzle 48 is arranged tilted from top to bottom toward the direction close to the heat exchange plate 51, and a gap is left between the nozzle of the nozzle 48 and the plate surface of the heat exchange plate 51. The number of delivery pumps 45 can be one or more, and the circulation pipe group includes at least one liquid phase extraction pipe 46 and at least one liquid phase return pipe 47. The liquid phase extraction pipe 46 is connected to the liquid collection tank 33 and the delivery pump 45, and the liquid phase return pipe 47 is connected to the corresponding main pipe 43 and the delivery pump 45. The delivery pump 45 extracts the liquid in the liquid collection tank 33 and pumps it into each main pipe 43 after pressurization to ensure that the liquid sprayed from the nozzle 48 forms a uniform liquid film 6 on the heat exchange plate 51. The specific number of delivery pumps 45, the number of pipes in the circulation pipe group, and the arrangement and connection method can be determined according to actual processing and arrangement needs. For example, refer to Figure 9 and Figure 10 Each delivery pump 45 is connected to a liquid phase return pipe 47 , and the liquid phase return pipe 47 is connected to multiple main pipes 43 through multiple branch pipes 471 .

[0100] Film uniformity significantly impacts the heat exchange efficiency of a plate reboiler. Both embodiments achieve uniform film formation, ensuring even distribution of the liquid film 6 across the surface of the heat exchange plate 51. Since the second embodiment requires multiple nozzles 48, the first embodiment is easier to manufacture and install; it also achieves superior film uniformity. The specific structural approach should be selected based on comprehensive considerations.

[0101] Furthermore, considering processing and installation, in actual application, the width of the heat exchange plates 51 along the horizontal direction will not be made particularly long, so the heat exchange plates 51 will be divided into multiple groups arranged side by side.

[0102] Specifically, refer to Figure 11 and Figure 12The membrane plate heat exchanger 5 includes multiple groups of heat exchange plate assemblies arranged side by side along a first horizontal direction. Each group of heat exchange plate assemblies includes multiple heat exchange plates 51 arranged side by side along a second horizontal direction. The plate surfaces of the heat exchange plates 51 are parallel to the first horizontal direction and perpendicular to the second horizontal direction. When the tower body 1 has a square cylindrical structure, the heat exchange plates 51 are hollow square plates. The first horizontal direction is the length of the tower body 1, and the second horizontal direction is the width of the tower body 1. When the tower body 1 has a cylindrical structure, the heat exchange plates 51 are also hollow square plates. However, the shape of the heat exchange plates 51 near the inner wall of the tower body 1 will adapt to the arcuate wall surface of the tower body 1, resulting in one side of the square plate being arc-shaped. The first horizontal direction and the second horizontal direction are two mutually perpendicular diameter directions in the cross section of the tower body 1.

[0103] The plate surface of the heat exchange plate 51 is arranged vertically, and multiple heat exchange plates 51 in each heat exchange plate group are arranged parallel and equidistantly along the above-mentioned second horizontal direction; the internal cavity of the heat exchange plate 51 constitutes a heat medium channel for passing a heat medium, such as steam, and the area between adjacent heat exchange plates 51 constitutes a rich liquid channel. In this application, the plate reboiler is built into the tower body 1. The rich liquid falling from the packing layer 2 does not need to be moved outside the tower through a pipeline. After being heated to become a lean liquid, it can be directly extracted from the tower bottom, so the rich liquid channel needs to be open and pass through from top to bottom; while the heat medium channel needs to be completely closed. After the rich liquid is heated on the plate surface of the heat exchange plate 51, desorption and regeneration are completed. At this time, the desorbed gas directly ascends from the rich liquid channel and separates from the lean liquid, so the width of the rich liquid channel must be greater than the width of the heat medium channel; generally, the distance between two adjacent heat exchange plates 51 in each adjacent heat exchange plate group is greater than 10 mm to ensure smooth upward movement of the gas.

[0104] In addition, the pressure of the heat medium channel is greater than the pressure of the rich liquid channel. Since the heat exchange plate 51 is thin, it is easy to deform or leak, so the heat exchange plate 51 needs to be reinforced. Figure 7 and Figure 8 The heat exchange plate 51 is provided with multiple support ribs 54, which extend perpendicular to the plate surface. This prevents excessive pressure differentials between the inside and outside of the heat exchange plate 51 from squeezing or expanding the internal cavity, potentially causing deformation or rupture of the heat exchange plate 51. The specific thickness of the heat exchange plate 51 depends on the internal and external pressure differentials of the heat exchange plate 51, the steam handling capacity, and other factors.

[0105] Further, in order to facilitate installation and connection, refer to Figure 11 and Figure 12A plurality of heat exchange medium inlets 14 and a plurality of heat exchange medium outlets 15 are provided on the side wall of the tower body 1; the medium pipeline includes a plurality of groups of heat exchange pipelines, each group of heat exchange pipelines includes at least one medium inlet pipe 52 and at least one medium outlet pipe 53; each medium inlet pipe 52 and each medium outlet pipe 53 in each group of heat exchange pipelines are connected to each heat exchange plate 51 in the same group of heat exchange plate groups; each medium inlet pipe 52 in each group of heat exchange pipelines is connected to the same heat exchange medium inlet 14, and each medium outlet pipe 53 is connected to the same heat exchange medium outlet 15.

[0106] The number of heat exchange pipe groups, the number of heat exchange plate groups, the number of heat exchange medium inlets 14 and the number of heat exchange medium outlets 15 are all the same; for example, in a specific example, referring to Figure 11 and Figure 12 , with three sets of heat exchange plate assemblies, three sets of heat exchange piping, three heat exchange medium inlets 14, and three heat exchange medium outlets 15. The number of medium inlet pipes 52 corresponding to each heat exchange medium inlet 14, and the number of medium outlet pipes 53 corresponding to each heat exchange medium outlet 15, can be designed based on actual needs. In practice, the area between two adjacent heat exchange plates 51 in each heat exchange plate assembly can be connected to one riser 32, or multiple risers 32, with the specific arrangement determined according to needs.

[0107] It can be understood that each medium inlet pipe 52 includes multiple coaxial sub-inlet pipes, two of which are connected to the plate surfaces of the two outermost heat exchange plates 51 in a group of heat exchange plates facing away from each other, and the remaining sub-inlet pipes are connected between the openings on each adjacent two heat exchange plates 51; similarly, each medium outlet pipe 53 includes multiple coaxial sub-outlet pipes, so that each medium inlet pipe 52 and each medium outlet pipe 53 passes through the heat exchange plate 51 and is connected to the interior of the heat exchange plate 51.

[0108] In summary, the regeneration tower with built-in falling film reboiler is used for absorbent heating regeneration, which has the following advantages:

[0109] (1) The plate heat exchanger is built into the regeneration tower kettle to reduce the size and floor space, thus reducing investment;

[0110] (2) Using a plate heat exchange structure, by evenly distributing the film on the plates of the plate heat exchanger, a uniform film is formed on the surface of the plate, which greatly increases the heat transfer coefficient, improves the heat transfer efficiency, reduces the use of heat media such as steam and regeneration energy consumption, and thus reduces the heat exchange area and equipment size.

[0111] (3) The provision of a gravity-type film-forming device (i.e., the rich liquid flows downward by gravity) and a forced film-forming device (i.e., a delivery pump 45 is provided, and the rich liquid flows downward by pumping force) can ensure uniform distribution of the rich liquid on the plate. The provision of the film-forming device 4 is the key to increasing the heat exchange efficiency. In the present application, the structure of the film-forming device 4 in the above two embodiments can achieve uniform film formation. The capillary roughness of the surface of the heat exchange plate 51 and the serrated edge of the lower end outlet of the film-forming channel in the above first embodiment are both helpful in improving the uniformity of the liquid film 6. Moreover, the rich liquid forms a liquid film 6 on the plate surface of the heat exchange plate 51 by gravity or by the pumping force of the delivery pump 45. Compared with the traditional swirl film formation, the film-forming method of the present application is simpler, more uniform, and more stable.

[0112] The above is only an illustrative embodiment of the present invention and is not intended to limit the scope of the present invention. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principle of the present invention should fall within the scope of protection of the present invention.

Claims

1. A regeneration tower with a built-in falling film reboiler, characterized in that: The tower comprises a tower body and a packing layer, a liquid collecting device, a film forming device and a membrane plate heat exchanger sequentially arranged from top to bottom in the tower body; The liquid collecting device includes a partition connected to the inner wall of the tower body and a plurality of rising cylinders arranged on the partition, and a through hole is opened on the partition corresponding to the bottom of each rising cylinder; the area between the rising cylinders above the partition forms a liquid collecting tank; the membrane plate heat exchanger includes a medium pipeline and a plurality of heat exchange plates arranged vertically on the plate surface, and the medium pipeline is used to pass the heat exchange medium into the interior of the heat exchange plate; The film forming device can be connected to the liquid collecting tank and is configured to guide the liquid in the liquid collecting tank to form a film on the plate surface of the heat exchange plate.

2. The regeneration tower with a built-in falling film reboiler according to claim 1, wherein The film-forming device includes a guide tube group and a plurality of film-forming parts, wherein a film-forming channel is formed inside the film-forming parts. The guide tube group is used to guide the liquid in the liquid collecting tank to the upper inlet of each film-forming channel, and a gap is formed between the lower outlet of the film-forming channel and the corresponding plate surface of the corresponding heat exchange plate.

3. The regeneration tower with built-in falling film reboiler according to claim 2, characterized in that: The film-forming member is a box structure with a socket at the lower end, and the guide tube group is connected to the top of the box structure; the top of the heat exchange plate extends into the box structure through the socket, and the gap is formed between the socket and the two side plate surfaces of the heat exchange plate; the top of the heat exchange plate is located in the box structure, or the top of the heat exchange plate passes through the top of the box structure.

4. The regeneration tower with built-in falling film reboiler according to claim 3, characterized in that The lower parts of the two side plates on both sides of the heat exchange plate in the box structure are inclined and extend downward to form an inclined baffle that gradually approaches the heat exchange plate. The area between the lower ends of the two inclined baffles in the box structure constitutes the socket, and the gap is formed between the lower ends of the inclined baffles and the corresponding plate surfaces of the heat exchange plate.

5. The regeneration tower with built-in falling film reboiler according to claim 3, characterized in that: The guide pipe group includes multiple groups of guide structures, each group of the guide structures includes two guide parts, and a guide channel is formed in each of the guide parts. The lower end outlets of the two guide channels in each group of the guide structures are connected to the top of the same film-forming part and are respectively located on both sides of the heat exchange plate.

6. The regeneration tower with a built-in falling film reboiler according to claim 5, characterized in that: The guide pipe group further includes a plurality of main pipes, each of which is connected to the upper inlets of two guide channels in the same guide structure.

7. The regeneration tower with a built-in falling film reboiler as claimed in claim 6, wherein: The medium pipeline includes a plurality of medium inlet pipes and a plurality of medium outlet pipes, each of which passes through the corresponding heat exchange plate and is connected to the interior of the heat exchange plate; the top of the heat exchange plate passes through the top of the box structure, the medium outlet pipe is located above the film forming member, and the medium inlet pipe is arranged near the bottom of the heat exchange plate; each of the flow guide members includes at least one branch member, and each of the branch members is connected to the main pipe and the film forming member; Each of the heat exchange plates is connected to one of the medium outlet pipes, each of the flow guide members includes two branch members, and the medium outlet pipe passes between the two branch members; or, each of the heat exchange plates is connected to multiple medium outlet pipes, and each of the branch members passes between two adjacent medium outlet pipes.

8. The regeneration tower with built-in falling film reboiler according to claim 2, characterized in that: The film-forming member is a hollow sheet structure, which includes a first side sheet and a second side sheet arranged in parallel and spaced apart. The plate surfaces of the first side sheet and the second side sheet are parallel to the plate surface of the heat exchange plate. The first side sheet is arranged close to the corresponding plate surface of the heat exchange plate, and the lower part of the second side sheet extends downwardly to form an inclined baffle that gradually approaches the heat exchange plate, and the gap is formed between the lower end of the inclined baffle and the corresponding plate surface of the heat exchange plate.

9. The regeneration tower with a built-in falling film reboiler according to claim 8, characterized in that: The guide tube group includes multiple mother tubes, each of which is connected to the upper end inlet of the film forming channel on one side of the heat exchange plate, or each of the mother tubes is connected to the upper ends of the two film forming channels between two adjacent heat exchange plates.

10. The regeneration tower with a built-in falling film reboiler according to claim 9, characterized in that: The medium pipeline includes a plurality of medium inlet pipes and a plurality of medium outlet pipes, each of which passes through the corresponding heat exchange plate and is connected to the interior of the heat exchange plate; the medium inlet pipe is arranged near the bottom of the heat exchange plate, and the medium outlet pipe is arranged near the top of the heat exchange plate; each of the main pipes is connected to the membrane forming member through a flow guide, and each of the flow guides includes at least one branch member, and each of the branch members is connected to the main pipe and the membrane forming member; Each of the heat exchange plates is connected to one of the medium outlet pipes, each of the flow guide members includes two branch members, and the medium outlet pipe passes between the two branch members; or, each of the heat exchange plates is connected to multiple medium outlet pipes, and each of the branch members passes between two adjacent medium outlet pipes.

11. The regeneration tower with a built-in falling film reboiler according to claim 6 or 9, characterized in that: The main pipe is connected to the liquid collecting tank through a connecting pipe.

12. The regeneration tower with a built-in falling film reboiler according to claim 6 or 9, characterized in that: A delivery pump is also provided on the outside of the tower body, and the guide pipe group also includes a circulation pipe group, which is connected to the delivery pump and each of the main pipes to pump the liquid in the liquid collecting tank into each of the film forming channels.

13. The regeneration tower with a built-in falling film reboiler according to claim 2, wherein: The edge of the lower outlet of the film-forming channel forms a serrated flow-guiding structure, and a texture structure is formed on the plate surface of the heat exchange plate.

14. The regeneration tower with a built-in falling film reboiler according to claim 1, wherein The film-forming device includes multiple main pipes and circulation pipe groups, each of the main pipes is arranged between two adjacent heat exchange plates, and two groups of nozzle assemblies are provided on both sides of the main pipe. Each group of nozzle assemblies includes multiple nozzles arranged at intervals along the length direction of the main pipe, and the nozzles of the nozzles are arranged toward the corresponding plate surfaces of the heat exchange plates; a delivery pump is also provided on the outside of the tower body, and the circulation pipe group is connected to the delivery pump and each of the main pipes to pump the liquid in the collecting tank into each of the main pipes.

15. The regeneration tower with a built-in falling film reboiler according to claim 1, wherein: The membrane plate heat exchanger comprises a plurality of heat exchange plate groups arranged side by side along a first horizontal direction, each heat exchange plate group comprises a plurality of heat exchange plates arranged side by side along a second horizontal direction, and the plate surfaces of the heat exchange plates are parallel to the first horizontal direction and perpendicular to the second horizontal direction; A plurality of heat exchange medium inlets and a plurality of heat exchange medium outlets are provided on the side wall of the tower body; the medium pipeline includes a plurality of groups of heat exchange pipelines, and each group of the heat exchange pipelines includes at least one medium inlet pipe and at least one medium outlet pipe; each of the medium inlet pipes and each of the medium outlet pipes in each group of the heat exchange pipelines is connected to each of the heat exchange plates in the same group of the heat exchange plate group; each of the medium inlet pipes in each group of the heat exchange pipelines is connected to the same heat exchange medium inlet, and each of the medium outlet pipes is connected to the same heat exchange medium outlet.

16. The regeneration tower with a built-in falling film reboiler according to claim 1, characterized in that: A plurality of supporting ribs are provided in the heat exchange plate, and the length direction of the supporting ribs is perpendicular to the plate surface of the heat exchange plate.

17. The regeneration tower with a built-in falling film reboiler according to claim 1, characterized in that: An air lift cap is provided at the top opening of the rising cylinder to prevent liquid from entering the rising cylinder.

18. The regeneration tower with a built-in falling film reboiler according to claim 17, characterized in that: The air lift cap comprises a V-shaped plate with the notch facing upwards, and gaps are left between the two plate bodies of the V-shaped plate and the top opening of the rising cylinder.

19. The regeneration tower with a built-in falling film reboiler according to claim 1, wherein: A gas phase outlet and a liquid phase outlet are respectively provided at the top and bottom of the tower body, and a liquid phase inlet, a heat exchange medium outlet and a heat exchange medium inlet are respectively provided on the side wall of the tower body from top to bottom. The liquid phase inlet is located above the packing layer, and the heat exchange medium outlet and the heat exchange medium inlet are connected to the medium pipeline.

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