A falling film organic amine regeneration equipment

Abstract

The utility model discloses a falling film type organic amine regeneration equipment, including a falling film type heat exchanger, the falling film type heat exchanger includes a shell, the top of the shell is provided with a gas outlet; a storage box, the storage box is fixed in the shell and located at the bottom of the shell, the upper end of the storage box is open and stores the organic amine rich liquid to be treated; a heat exchange device, at least one heat exchange device is provided, and multiple heat exchange devices are all located above the storage box and arranged in the vertical direction, each heat exchange device includes multiple heat exchange plates arranged at intervals in the horizontal direction. A film spreading device, the film spreading device is arranged corresponding to the heat exchange device and is located above the corresponding heat exchange device, the organic ammonia rich liquid in the storage box is transported to the film spreading device through a liquid supply pipeline, the film spreading device evenly distributes the organic amine rich liquid to the surface of the heat exchange plate, the organic amine rich liquid flows downward along the heat exchange plate and is collected in the storage box, so that the organic amine lean liquid is circulated and used.

Description

Technical Field

[0001] The utility model relates to the technical field of organic amine regeneration equipment, in particular to falling film type organic amine regeneration equipment. Background Art

[0002] In industry, the absorption and analysis regeneration process is commonly used to treat CO2 in flue gas, and organic amines are commonly used absorbents. The chemical absorption method using organic amines as absorbents in carbon capture technology is considered to be the most mature CO2 capture technology at present because of its large absorption capacity, fast absorption rate, high CO2 capture efficiency, mature process and high flue gas adaptability. However, after organic amines absorb CO2, they become rich liquid, which needs to be regenerated. Rich liquid can usually decompose at 120℃-140℃ to release CO2 and organic amines.

[0003] In the prior art, during the regeneration of organic amines, the organic amine rich liquid is sent to the regeneration tower through a heat exchanger and heated by steam to achieve the regeneration of the organic amine and the release of CO2. Although the thermal desorption regeneration process is mature and the equipment is simple, it still has certain limitations. For example, the equipment occupies a relatively large area, and the organic amines are very easy to volatilize and oxidatively degrade at high temperatures, thereby reducing the circulating absorption load. In addition, the energy consumption of thermal desorption regeneration technology is relatively high and the loss is huge. The main heat losses include steam heating losses, device heat dissipation, cooler heat consumption, etc. In addition, most organic amines are highly volatile, and continuous heating will accelerate the escape of amines, increase the cost of amine capture and amine losses, and increase the total cost. Utility Model Content

[0004] In order to overcome the above shortcomings, the purpose of the utility model is to provide a falling film organic amine regeneration equipment. After the organic amine rich liquid passes through the falling film heat exchanger, the rich liquid is decomposed to generate organic amine lean liquid and CO2. After the carbon dioxide is cooled, it is compressed to the back-end process, and the organic amine lean liquid is recycled.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is: a falling film organic amine regeneration equipment, comprising:

[0006] A falling film heat exchanger, comprising:

[0007] A shell, wherein a gas outlet is provided at the top of the shell;

[0008] A storage box, the storage box is fixed in the shell and located at the bottom of the shell, the upper end of the storage box is open and stores the organic amine rich liquid to be treated;

[0009] A heat exchange device, wherein at least one heat exchange device is provided, and a plurality of the heat exchange devices are located above the storage box and arranged in the vertical direction, and each of the heat exchange devices comprises a plurality of heat exchange plates arranged at intervals in the horizontal direction;

[0010] A film-laying device is provided corresponding to the heat exchange device and is located above the corresponding heat exchange device. The organic amine rich liquid in the storage box is transported to the film-laying device through a liquid supply pipeline. The film-laying device evenly distributes the organic amine rich liquid to the surface of the heat exchange plate. The organic amine rich liquid flows downward along the heat exchange plate and is collected in the storage box.

[0011] The beneficial effects of the utility model are:

[0012] 1. The organic amine rich liquid and the heat exchange plate perform inter-wall heat exchange, which has high heat transfer coefficient, reduces energy consumption and has high economic value.

[0013] 2. Due to the membrane of the membrane device, the organic amine rich liquid flows in a film-like state outside the heat exchange plate. The driving force of the flow is gravity. After the heat exchange, the organic amine rich liquid flows downward along the heat exchange plate and collects in the storage box to repeat the heat exchange. The circulation of the organic amine rich liquid can control the carbon content of the organic amine solution, which is conducive to the recycling and regeneration of the organic amine liquid.

[0014] Furthermore, the device also includes a post-processing component, which is connected to the gas outlet of the falling film heat exchanger. The post-processing component includes a heat exchanger and a compressor connected in series, which is used to cool and compress the gas discharged from the gas outlet.

[0015] The carbon dioxide is cooled and compressed to facilitate subsequent processing.

[0016] Furthermore, the heat exchange device further includes a catalyst filler fixed between two adjacent heat exchange plates. The catalyst filler is fixed between the two heat exchange plates, and the catalyst can reduce the regeneration reaction temperature and reaction energy barrier, improve the analysis efficiency, reduce the temperature of thermal analysis, greatly improve the equipment efficiency and reduce energy consumption.

[0017] Specifically, the vertical distance between two adjacent heat exchange plates in one heat exchange device is 40-50 cm, which can ensure the flow of the film-like organic amine rich liquid and the full reaction of the organic amine rich liquid and the catalyst filler.

[0018] Furthermore, the heat exchange device further comprises a support frame, which is located below the heat exchange plate, all the heat exchange plates are fixed on the support frame, the support frame is fixed in the shell, and a liquid outlet is provided on the support frame. The support frame plays a role in fixing the heat exchange plate, and at the same time, the structure of the support plate cannot hinder the fall of the organic amine rich liquid after heat exchange, so that it can be collected in the storage box.

[0019] Specifically, the film-laying device comprises:

[0020] A distributor, the distributor comprising a drainage circular tube arranged corresponding to the heat exchange plate and located directly above the heat exchange plate, a diverter plate in an inverted "V"-shaped structure is arranged between two adjacent drainage circular tubes, and the diverter plate can guide the liquid to a part of the outer wall of the drainage circular tube;

[0021] The orifice plate is located above the distributor and is provided with liquid outlet holes corresponding to the top of the diverter plate.

[0022] The structure of the membrane device allows the organic amine rich liquid to flow in a film-like manner outside the heat exchange plate.

[0023] Furthermore, the film-laying device further comprises two guide plates, the two guide plates are respectively located on the outer sides of the heat exchange plates on both sides along the distribution direction of the heat exchange plates, and the orifice plate is fixed between the two guide plates;

[0024] Each of the guide plates comprises an inclined portion, and the inclined portion is inclined from top to bottom toward the heat exchange plate.

[0025] The guide plate is set to guide the organic amine rich liquid from the outermost side to prevent part of the organic amine rich liquid flowing out of the orifice plate from falling directly, thereby ensuring that the organic amine rich liquid flows along the heat exchange plate.

[0026] Furthermore, the heat exchange plate is a pillow-type plate heat exchange plate, and a heat exchange medium flows in the heat exchange plate. The pillow-type plate heat exchange plate can make the internal heat exchange medium achieve a higher heat exchange effect at a low flow rate, and reduce system resistance, thereby reducing energy consumption.

[0027] Furthermore, a circulation pump is provided on the liquid supply pipeline, and the circulation pump provides power for the flow of the ammonia-rich liquid in the liquid supply pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the structure of an embodiment of the utility model;

[0029] Figure 2 It is a cross-sectional view of a falling film heat exchanger in an embodiment of the utility model;

[0030] Figure 3 Another angle sectional view of the falling film heat exchanger in the embodiment of the utility model;

[0031] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0032] Figure 5 A cross-sectional view of a heat exchange plate in an embodiment of the utility model;

[0033] Figure 6 It is a schematic diagram of the structure of the heat exchange plate in the embodiment of the utility model.

[0034] In the figure:

[0035] 100. Falling film heat exchanger;

[0036] 1. Shell; 11. Gas outlet; 12. Liquid outlet; 13. Liquid supply port; 14. Liquid inlet; 15. Medium inlet; 16. Medium outlet; 2. Storage box; 3. Heat exchange device; 31. Heat exchange plate; 311. Inlet; 312. Outlet; 32. Catalyst filler; 33. Support frame; 4. Membrane device; 41. Distributor; 411. Drainage tube; 412. Diverter plate; 42. Orifice plate; 421. Liquid outlet; 43. Guide plate; 431. Inclined portion;

[0037] 2. Liquid supply pipeline; 21. Circulation pump;

[0038] 3. Heat exchanger;

[0039] 4. Compressor. DETAILED DESCRIPTION

[0040] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0041] Example

[0042] See attached Figure 1 As shown, a falling film organic amine regeneration device of the utility model comprises a falling film heat exchanger 100, which is used to heat the organic amine rich liquid to decompose it to form organic amine lean liquid and CO2. The organic amine rich liquid refers to the organic amine liquid that absorbs a large amount of CO2, and the organic amine lean liquid refers to the organic amine liquid that does not absorb CO2.

[0043] In this embodiment, a falling film heat exchanger 100 is used to perform heat exchange with the organic amine rich liquid. Since film flow is used, the heat exchange efficiency is high.

[0044] See attached Figure 2 and attached Figure 3As shown, the falling film heat exchanger 100 includes a shell 1, a storage box 2, at least one heat exchange device 3 and a film-laying device 4 corresponding to the heat exchange device 3. A gas outlet 11 is provided at the top of the shell 1, and CO2 generated by heat exchange of organic amine rich liquid is discharged from the shell 1 through the gas outlet 11. The storage box 2 is fixed in the shell 1 and is located at the bottom of the shell 1. The upper end of the storage box 2 is open and stores the organic amine rich liquid to be treated. A plurality of the heat exchange devices 3 are located above the storage box 2 and arranged in the vertical direction, and each of the heat exchange devices 3 includes a plurality of heat exchange plates 31 arranged at intervals in the horizontal direction. The film-laying device 4 is located above the corresponding heat exchange device 3, and the organic ammonia rich liquid in the storage box 2 is transported to the film-laying device 4 through the liquid supply pipe 2. The film-laying device 4 evenly distributes the organic amine rich liquid on the surface of the heat exchange plate 31, and the organic amine rich liquid flows downward along the heat exchange plate 31 and is collected in the storage box 2.

[0045] In this embodiment, the organic amine rich liquid and the heat exchange plate 31 perform inter-wall heat exchange, which has a high heat exchange coefficient, reduces energy consumption, and has high economic value. Due to the film spreading of the film spreading device 4, the organic amine rich liquid flows in a film-like state outside the heat exchange plate 31, and the driving force of the flow is gravity. The organic amine rich liquid after heat exchange flows downward along the heat exchange plate 31 and is collected in the storage box 2, and the heat exchange is repeated. That is, the organic amine rich liquid circulates, which can control the carbon content of the organic amine solution, and is conducive to the recycling and regeneration of the organic amine liquid.

[0046] In one embodiment, see the attached Figure 5 As shown, the heat exchange device 3 also includes a catalyst filler 32 fixed between two adjacent heat exchange plates 31. The catalyst filler 32 is fixed between the two heat exchange plates 31. The catalyst can reduce the regeneration reaction temperature and reaction energy barrier, improve the analysis efficiency, reduce the temperature of thermal analysis, greatly improve the equipment efficiency and reduce energy consumption. The catalyst filler 32 includes triethylamine, dimethylamine, pyridine, pyrrole and other organic amine catalysts compressed between the heat exchange plates 31, and can be fixed to the heat exchange plates 31.

[0047] In one embodiment, the vertical distance between two adjacent heat exchange plates 31 in one heat exchange device 3 is 40-50 cm. At this time, the thickness of the catalyst filler 32 is also 40-50 cm. This distance can ensure the flow of the film-like organic amine rich liquid and the full reaction of the organic amine rich liquid and the catalyst filler 32.

[0048] In one embodiment, see the attached Figure 2 As shown, the heat exchange device 3 further includes a support frame 33, which is located below the heat exchange plates 31, all the heat exchange plates 31 are fixed on the support frame 33, and the support frame 33 is fixed in the shell 1. A lower liquid port is opened on the support frame 33.

[0049] The support frame 33 serves to fix the heat exchange plate 31. At the same time, the structure of the support plate should not hinder the fall of the organic amine rich liquid after heat exchange, so that it can be collected in the storage box 2. The upper end of the storage box 2 is open, and the organic amine rich liquid after heat exchange can fall directly.

[0050] In one embodiment, the storage box 2 is also provided with a liquid outlet 12, a liquid supply port 13 and a liquid inlet 14 that pass through the shell 1. The liquid supply port 13 is connected to the liquid supply pipeline 2, and the organic amine rich liquid to be treated enters the storage box 2 from the liquid inlet 14. The organic amine rich liquid that has been circulated for a period of time for heat exchange has satisfied the separation of CO2 to form an organic amine lean liquid. The organic amine lean liquid can be discharged from the liquid outlet 12 for other operations.

[0051] See attached Figure 5 As shown, the heat exchange plate 31 is a pillow-type plate heat exchange plate 31, and a heat exchange medium flows in the heat exchange plate 31. The heat exchange plate 31 includes a first plate and a second plate, and the first plate and the second plate have a plurality of welding points for fixing the first plate and the second plate. A flow channel is formed between the first plate and the second plate, and a heat exchange medium flows in the flow channel. The heat exchange plate 31 is provided with an inlet 311 and an outlet 312 that are connected to the flow channel, and the heat exchange medium enters from the inlet 311 and flows out from the outlet 312.

[0052] The heat exchange medium can be steam or heat transfer oil. The inlet 311 of each heat exchange plate 31 is connected to a medium distribution pipe, and the external heat exchange medium is evenly distributed to each heat exchange plate 31 through the medium distribution pipe. The outlet 312 of each heat exchange plate 31 is connected to a medium collection pipe, and the heat exchange medium in the flow channel is collected in the medium collection pipe and flows out of the shell 1. That is, the heat exchange plates 31 are connected in parallel to maintain temperature uniformity. The shell 1 is provided with a medium inlet 15 and a medium outlet 16 through which the medium distribution pipe and the medium collection pipe pass through the shell 1. Figure 1 The space arrow in the figure indicates the flow direction of the heat transfer medium.

[0053] In one embodiment, the device further includes a post-processing component, which is connected to the gas outlet 11 of the falling film heat exchanger 100. The post-processing component includes a heat exchanger 3 and a compressor 4 connected in series, and is used to cool and compress the gas discharged from the gas outlet 11.

[0054] The CO2 produced by the falling film heat exchanger 100 has a relatively high temperature and is first cooled by the heat exchanger and then compressed by the compressor 4 for subsequent processing.

[0055] See attached Figure 3 Attached Figure 4As shown, the membrane device 4 includes a distributor 41 and a perforated plate 42. The distributor 41 includes a drainage circular tube 411 corresponding to the heat exchange plate 31 and located directly above the heat exchange plate 31. A diverter plate 412 in an inverted "V"-shaped structure is provided between two adjacent drainage circular tubes 411. The diverter plate 412 can guide the liquid to a part of the outer wall of the drainage circular tube 411. The perforated plate 42 is located above the distributor 41, and a liquid outlet hole 421 corresponding to the top of the diverter plate 412 is provided on the perforated plate 42.

[0056] The flow divider 412 includes a first inclined plate and a second inclined plate, the bottom ends of the two inclined plates are respectively in contact with the corresponding drainage circular tubes 411, and the top ends intersect and are fixed. The organic amine rich liquid in the storage box 2 is sprayed onto the orifice plate 42 through the liquid supply pipe 2 and flows out from the liquid outlet 421. The liquid flowing out of the liquid outlet 421 is guided by the flow divider 412 and flows to the two adjacent drainage circular tubes 411, and finally flows along the outer surface of the drainage circular tube 411 and flows to the surface of the heat exchange plate 31 for heat exchange.

[0057] In one embodiment, the film-laying device 4 further includes two guide plates 43, which are respectively located on the outside of the heat exchange plates 31 on both sides along the distribution direction of the heat exchange plates 31, and the orifice plate 42 is fixed between the two guide plates 43. Each of the guide plates 43 includes an inclined portion 431, and the inclined portion 431 is inclined from top to bottom toward the heat exchange plate 31.

[0058] The guide plate 43 is provided to guide the organic amine rich liquid from the outermost side to prevent part of the organic amine rich liquid flowing out of the orifice plate 42 from falling directly, thereby ensuring that the organic amine rich liquid flows along the heat exchange plate 31 .

[0059] The liquid supply pipeline 2 is provided with a circulation pump 21 , and the circulation pump 21 provides power for the flow of the ammonia-rich liquid in the liquid supply pipeline 2 .

[0060] The organic amine rich liquid to be treated is stored in the storage box 2, and the circulation pump 21 is started to make the organic amine rich liquid flow downward in a film-like manner along the surface of the heat exchange plate 31 from the top of the heat exchange plate 31 under the action of gravity, and circulate continuously. Steam or heat transfer oil is introduced into the heat exchange plate 31, and the organic amine solution and the heat exchange medium inside the heat exchange plate 31 are subjected to convection heat exchange to decompose CO2 and reduce the CO2 content in the organic amine solution. Figure 1 The direction indicated by the solid arrow in the middle is the circulation direction of the organic amine rich liquid during heat exchange.

[0061] The above implementation modes are only for illustrating the technical concept and features of the utility model, and their purpose is to allow people familiar with this technology to understand the content of the utility model and implement it. It cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A falling film organic amine regeneration device, characterized in that: include: A falling film heat exchanger, comprising: A shell, wherein a gas outlet is provided at the top of the shell; A storage box, the storage box is fixed in the shell and located at the bottom of the shell, the upper end of the storage box is open and stores the organic amine rich liquid to be treated; A heat exchange device, wherein at least one heat exchange device is provided, and a plurality of the heat exchange devices are located above the storage box and arranged in the vertical direction, and each of the heat exchange devices comprises a plurality of heat exchange plates arranged at intervals in the horizontal direction; A film-laying device is provided corresponding to the heat exchange device and is located above the corresponding heat exchange device. The organic amine rich liquid in the storage box is transported to the film-laying device through a liquid supply pipeline. The film-laying device evenly distributes the organic amine rich liquid to the surface of the heat exchange plate. The organic amine rich liquid flows downward along the heat exchange plate and is collected in the storage box.

2. The falling film organic amine regeneration equipment according to claim 1, characterized in that: The device also includes a post-processing component, which is connected to the gas outlet of the falling film heat exchanger. The post-processing component includes a heat exchanger and a compressor connected in series, and is used to cool and compress the gas discharged from the gas outlet.

3. The falling film organic amine regeneration equipment according to claim 1, characterized in that: The heat exchange device also includes a catalyst filler fixed between two adjacent heat exchange plates.

4. The falling film organic amine regeneration equipment according to claim 3, characterized in that: The vertical distance between two adjacent heat exchange plates in one of the heat exchange devices is 40-50 cm.

5. The falling film organic amine regeneration equipment according to claim 1, characterized in that: The heat exchange device further comprises a support frame, which is located below the heat exchange plates, all the heat exchange plates are fixed on the support frame, the support frame is fixed in the shell, and a lower liquid port is provided on the support frame.

6. The falling film organic amine regeneration equipment according to claim 1, characterized in that: The film spreading device comprises: A distributor, the distributor comprising a drainage circular tube arranged corresponding to the heat exchange plate and located directly above the heat exchange plate, a diverter plate in an inverted "V"-shaped structure is arranged between two adjacent drainage circular tubes, and the diverter plate can guide the liquid to a part of the outer wall of the drainage circular tube; The orifice plate is located above the distributor and is provided with liquid outlet holes corresponding to the top of the diverter plate.

7. The falling film organic amine regeneration equipment according to claim 6, characterized in that: The film distribution device further comprises two guide plates, which are respectively located on the outsides of the heat exchange plates on both sides along the distribution direction of the heat exchange plates, and the orifice plate is fixed between the two guide plates; Each of the guide plates comprises an inclined portion, and the inclined portion is inclined from top to bottom toward the heat exchange plate.

8. The falling film organic amine regeneration equipment according to claim 1, characterized in that: The heat exchange plate is a pillow-type plate heat exchange plate, and heat exchange medium flows in the heat exchange plate.

9. The falling film organic amine regeneration equipment according to claim 1, characterized in that: The liquid supply pipeline is provided with a circulation pump, and the circulation pump provides power for the flow of the ammonia rich liquid in the liquid supply pipeline.

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