Nitric oxide gradient hypothermia and oxidation system

Abstract

The utility model relates to gas temperature reduction technical field, proposes a kind of nitrogen oxide gradient cooling and oxidation system, including primary heat exchanger, primary heat exchanger is connected with secondary heat exchanger by pipeline, secondary heat exchanger is connected with tertiary heat exchanger by pipeline, the other side of tertiary heat exchanger is connected with circulating tank by pipeline, the inside middle part of tertiary heat exchanger is fixedly connected with radiating fin, the outer surface of radiating fin is connected with tertiary heat exchange tube, the inside connection of tertiary heat exchanger shell has shunt structure, circulating tank is used to cooperate tertiary heat exchanger circulating liquid and dry ice particle and realizes dry ice bath in the inside of tertiary heat exchanger;Shunt structure includes fixed column fixedly connected on the inner wall surface of the upper end of tertiary heat exchanger shell, and the surface of fixed column is fixedly connected with one level shunt plate.The above-mentioned technical scheme, when the existing gradient cooling system is cooled by dry ice to nitrogen oxide, the problem of uneven dry ice bath, unstable and uniform in the last stage of gradient cooling is solved.

Description

Technical Field

[0001] This utility model relates to the field of gas cooling technology, specifically to a nitrogen oxide gradient cooling and oxidation system. Background Technology

[0002] Nitric oxide (NO), as an important bioactive molecule and industrial gas, has wide applications in medicine, environmental science, and chemical engineering. In medicine, NO participates in physiological processes such as vasodilation, neurotransmission, and immune regulation; in industry, NO is a key intermediate in processes such as nitric acid production and waste gas treatment. However, NO is chemically reactive and readily reacts with oxygen to form nitrogen dioxide (NO2), a characteristic that poses challenges to its storage, transportation, and application. Therefore, developing efficient NO gradient cooling and oxidation systems is of great significance for achieving stable control, targeted conversion, and resource utilization of NO. In recent years, the integration of gradient cooling technology and staged oxidation strategies has provided a new approach to solving the above problems. By designing multi-stage temperature control modules, the gradual cooling of NO can be achieved, avoiding phase transition runaway; while the coupled oxidation reactor can regulate the NO→NO2 conversion pathway in stages based on the temperature-reaction kinetics relationship. However, the existing gradient cooling system mentioned above is prone to unevenness in the dry ice bath when cooling nitrogen oxides with dry ice, resulting in an unstable and uneven gradient cooling process in the final stage. To address this, we propose a nitrogen oxide gradient cooling and oxidation system. Utility Model Content

[0003] This invention proposes a nitrogen oxide gradient cooling and oxidation system, which solves the problem mentioned in the background art that existing gradient cooling systems easily cause unevenness in the dry ice bath and instability and uniformity in the final stage of gradient cooling when cooling nitrogen oxides with dry ice.

[0004] The technical solution of this utility model is as follows: A nitrogen oxide gradient cooling and oxidation system includes a primary heat exchanger, a secondary heat exchanger connected to the primary heat exchanger via a pipe, a tertiary heat exchanger connected to the secondary heat exchanger via a pipe, a circulation tank connected to the other side of the tertiary heat exchanger via a pipe, heat dissipation fins fixedly connected to the center of the interior of the tertiary heat exchanger, tertiary heat exchange tubes inserted through the outer surface of the heat dissipation fins, a flow distribution structure connected inside the shell of the tertiary heat exchanger, and the circulation tank used to cooperate with the circulating liquid and dry ice particles of the tertiary heat exchanger to realize a dry ice bath inside the tertiary heat exchanger; The flow distribution structure includes a fixed column fixedly connected to the inner wall surface of the upper end of the shell of the three-stage heat exchanger. A primary flow distribution plate is fixedly connected to the surface of the fixed column. A secondary flow distribution plate is connected below the primary flow distribution plate. A sleeve pipe is connected between the fixed column and the secondary flow distribution plate. A first through hole is opened on the outer surface of the secondary flow distribution plate. A second through hole is opened on the outer surface of the primary flow distribution plate. Side plates are fixedly connected to both sides of the primary flow distribution plate. End plates are fixedly connected to both ends of the primary flow distribution plate.

[0005] As a further technical solution of this utility model, the fixed column and the sleeve are fixedly connected, and the sleeve and the secondary diversion plate are fixedly connected.

[0006] As a further technical solution of this utility model, the sleeve is a hollow structure, an adjusting spring is connected between the lower end of the fixed column and the secondary flow divider plate, a guide column is fixedly connected to the upper inner wall surface of the tertiary heat exchanger shell, and a sleeve column is connected between the secondary flow divider plate and the guide column.

[0007] As a further technical solution of this utility model, the number of fixed columns is several groups and they are distributed in an array. The number of sleeves is equal to the number of fixed columns. The side plate is set with an outward inclined structure. The end plate is perpendicular to the first-stage diversion plate.

[0008] As a further technical solution of this utility model, the number of the second through holes on the surface of the first-stage diverter plate is several groups and distributed in a ring array, the number of the first through holes is several groups and distributed in an array, and the hole diameter of the several groups of first through holes is distributed in a structure with the middle position being smaller and the two sides being larger.

[0009] As a further technical solution of this utility model, the sleeve tube slides up and down along the length of the fixed column, the adjusting spring is located inside the sleeve tube, and the upper and lower elastic ends of the adjusting spring are fixedly connected to the fixed column and the secondary flow divider plate respectively. The secondary flow divider plate moves downward by the impact of liquid and dry ice particles, and the position of the secondary flow divider plate is reset by the adjusting spring.

[0010] As a further technical solution of this utility model, the sleeve post is a hollow columnar structure, and the inner diameter of the sleeve post matches the diameter of the guide post. The sleeve post slides up and down along the guide post. The guide post and the sleeve post are used to maintain the stability of the up and down movement of the secondary flow divider plate. The number of guide posts and sleeve posts are two sets and they are symmetrically distributed.

[0011] As a further technical solution of this utility model, the upper and lower ends of the three-stage heat exchanger are respectively fixedly connected to an inlet pipe and an outlet pipe, the upper and lower ends of the circulation tank are respectively fixedly connected to a circulation pipe and a guide pipe, the circulation pipe is fixedly connected to the inlet pipe, the outlet pipe is fixedly connected to the guide pipe, a circulation pump is fixedly connected inside the circulation tank, the output end of the circulation pump is fixedly connected to the lower end of the circulation pipe through a pipeline, a balance valve and an ice supply pipe are fixedly connected to the outer surface of the circulation tank, the balance valve is used to balance the air pressure inside the circulation tank, and the ice supply pipe is used to add dry ice particles, an oxygen supply pipe and a primary heat exchange pipeline are fixedly connected to the outer surface of the primary heat exchanger, the oxygen supply pipe is used to inject oxygen, a secondary heat exchange pipeline is fixedly connected to the outer surface of the secondary heat exchanger, one water outlet end of the primary heat exchange pipeline is fixedly connected to one water outlet end of the secondary heat exchange pipeline, and one water outlet end of the secondary heat exchange pipeline is fixedly connected to the tertiary heat exchanger.

[0012] The working principle and beneficial effects of this utility model are as follows: In this invention, the diversion structure allows the solution and dry ice particles injected into the three-stage heat exchanger to be evenly distributed among several sets of heat dissipation fins during use. This makes the temperature of each area inside the three-stage heat exchanger more uniform, resulting in more accurate temperature control of the nitrogen dioxide liquid discharged from the three-stage heat exchanger, better cooling effect, and more stable temperature control. Attached Figure Description

[0013] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0014] Figure 1 This is a schematic diagram of the structure of the nitrogen oxide gradient cooling and oxidation system of this utility model; Figure 2 This is a partial structural diagram of the three-stage heat exchanger of this utility model; Figure 3 This utility model Figure 2 A schematic diagram of the cut-out section of the structure; Figure 4 This is a partial structural diagram of the three-stage heat exchanger of this utility model cut open; Figure 5 This utility model Figure 4 Enlarged view of the local structure at the first-stage splitter.

[0015] In the diagram: 1. Primary heat exchanger; 2. Secondary heat exchanger; 3. Tertiary heat exchanger; 4. Circulation tank; 5. Diversion structure; 51. Fixed column; 52. Primary diversion plate; 53. Secondary diversion plate; 54. No. 1 through hole; 55. Side plate; 56. End plate; 57. Socket pipe; 58. Guide column; 59. Socket column; 510. Adjusting spring; 511. No. 2 through hole; 6. Heat dissipation fins; 7. Tertiary heat exchange tube; 8. Inlet pipe; 9. Outlet pipe; 10. Guide pipe; 11. Circulation pipe; 12. Circulation pump; 13. Balance valve; 14. Ice supply pipe; 15. Oxygen supply pipe; 16. Primary heat exchange pipeline; 17. Secondary heat exchange pipeline. Detailed Implementation

[0016] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this utility model.

[0017] Example 1, as Figures 1-5 As shown, this embodiment proposes a nitrogen oxide gradient cooling and oxidation system, including a primary heat exchanger 1, a secondary heat exchanger 2 connected to the primary heat exchanger 1 via a pipe, a tertiary heat exchanger 3 connected to the secondary heat exchanger 2 via a pipe, and a circulation tank 4 connected to the other side of the tertiary heat exchanger 3 via a pipe. Heat dissipation fins 6 are fixedly connected to the center of the interior of the tertiary heat exchanger 3, and tertiary heat exchange tubes 7 are inserted and connected to the outer surface of the heat dissipation fins 6. A flow distribution structure 5 is connected inside the shell of the tertiary heat exchanger 3. The circulation tank 4 is used to cooperate with the circulating liquid and dry ice particles of the tertiary heat exchanger 3 to achieve a dry ice bath inside the tertiary heat exchanger 3. An inlet pipe 8 and an outlet pipe 9 are fixedly connected to the upper and lower ends of the tertiary heat exchanger 3, respectively. A circulation pipe 11 and a guide pipe 10 are fixedly connected to the upper and lower ends of the circulation tank 4, respectively. 1. The inlet pipe 8 is fixedly connected to the outlet pipe 9 and the guide pipe 10. The circulation pump 12 is fixedly connected inside the circulation tank 4. The output end of the circulation pump 12 is fixedly connected to the lower end of the circulation pipe 11 through a pipeline. The outer surface of the circulation tank 4 is fixedly connected to the balance valve 13 and the ice supply pipe 14. The balance valve 13 is used to balance the air pressure inside the circulation tank 4. The ice supply pipe 14 is used to add dry ice particles. The outer surface of the first-stage heat exchanger 1 is fixedly connected to the oxygen supply pipe 15 and the first-stage heat exchange pipeline 16. The oxygen supply pipe 15 is used to inject oxygen. The outer surface of the second-stage heat exchanger 2 is fixedly connected to the second-stage heat exchange pipeline 17. One end of the water outlet of the first-stage heat exchange pipeline 16 is fixedly connected to one end of the water outlet of the second-stage heat exchange pipeline 17. One end of the water outlet of the second-stage heat exchange pipeline 17 is fixedly connected to the third-stage heat exchanger 7.

[0018] The flow distribution structure 5 includes a fixed column 51 fixedly connected to the inner wall surface of the upper end of the shell of the three-stage heat exchanger 3. A primary flow distribution plate 52 is fixedly connected to the surface of the fixed column 51. A secondary flow distribution plate 53 is connected below the primary flow distribution plate 52. A sleeve pipe 57 is connected between the fixed column 51 and the secondary flow distribution plate 53. A first through hole 54 is opened on the outer surface of the secondary flow distribution plate 53. A second through hole 511 is opened on the outer surface of the primary flow distribution plate 52. Side plates 55 are fixedly connected to both sides of the primary flow distribution plate 52. End plates 56 are fixedly connected to both ends of the primary flow distribution plate 52.

[0019] The fixed column 51 is fixedly connected to the sleeve pipe 57, and the sleeve pipe 57 is fixedly connected to the secondary flow divider plate 53. The sleeve pipe 57 is a hollow structure. An adjusting spring 510 is connected between the lower end of the fixed column 51 and the secondary flow divider plate 53. A guide column 58 is fixedly connected to the upper inner wall surface of the shell of the tertiary heat exchanger 3. A sleeve column 59 is connected between the secondary flow divider plate 53 and the guide column 58. The number of fixed columns 51 is several groups and they are distributed in an array. The number of sleeve pipes 57 is equal to the number of fixed columns 51. The side plate 55 is set with an outward inclined structure. The end plate 56 is perpendicular to the primary flow divider plate 52.

[0020] The number of No. 2 through holes 511 on the surface of the primary flow divider plate 52 is in several groups and arranged in a ring array. The number of No. 1 through holes 54 is also in several groups and arranged in an array. The diameter of the several groups of No. 1 through holes 54 is distributed in a structure where the diameter is smaller in the middle and larger on both sides. The sleeve pipe 57 slides up and down along the length of the fixed column 51. The adjusting spring 510 is located inside the sleeve pipe 57. The upper and lower elastic ends of the adjusting spring 510 are fixedly connected to the fixed column 51 and the secondary flow divider plate 53, respectively. The secondary flow divider plate 53 moves downward by impacting the liquid and dry ice particles. The position of the secondary flow divider plate 53 is reset by adjusting the spring 510. The sleeve column 59 is a hollow columnar structure. The inner diameter of the sleeve column 59 matches the diameter of the guide column 58. The sleeve column 59 slides up and down along the guide column 58. The guide column 58 and the sleeve column 59 are used to maintain the stability of the vertical movement of the secondary flow divider plate 53. There are two groups of guide columns 58 and sleeve columns 59, which are symmetrically distributed.

[0021] In this embodiment, during use, the solution and dry ice particles injected into the three-stage heat exchanger 3 can be evenly distributed between several sets of heat dissipation fins 6, thereby making the temperature of each area inside the three-stage heat exchanger 3 more uniform. This allows for more accurate temperature control of the nitrogen dioxide liquid discharged from the three-stage heat exchanger 7, resulting in better cooling and more stable temperature control.

[0022] In summary, the working principle of this utility model is as follows: During use, the three stages of filtration are performed separately. The first stage cools the temperature from 200℃ to 30℃, the second stage cools it from 30℃ to 10℃, and the third stage cools it from 10℃ to -10℃. The specific temperature after cooling can also be controlled according to the user's actual needs. Dry ice granules are used in the dry ice bath with acetone or ethanol in a 1:1 ratio. The internal structure of the three-stage heat exchanger 3 and the circulation box 4 should have corresponding antifreeze performance. For example, the circulation pump 12 can be a low-temperature resistant magnetic pump, sealed with PTFE to prevent refrigerant leakage. The adjusting spring 510 can be made of austenitic stainless steel or other low-temperature resistant materials. The remaining structures should have corresponding antifreeze performance while maintaining their original performance. During filtration, the solution first passes through the primary heat exchanger 1. During the cooling process, when the temperature drops from 60°C to 30°C, oxygen is introduced to carry out an oxidation reaction, causing nitrogen oxides to form nitrogen dioxide. After the temperature drops to 30°C, the solution is introduced into the secondary heat exchanger 2 through the pipeline at the inlet of the secondary heat exchanger pipe 17 for heat exchange. After the temperature drops from 30°C to 10°C, the solution is discharged into the tertiary heat exchanger pipe 7 through the secondary heat exchanger pipe 17 for further cooling. When nitrogen dioxide at 10°C is discharged into the interior of the tertiary heat exchange tube 7, the circulation pump 12 operates synchronously. The circulation pump 12 discharges the refrigerant into the interior of the circulation pipe 11, and the circulation pipe 11 passes the refrigerant into the interior of the liquid inlet pipe 8. Finally, the refrigerant enters the interior of the tertiary heat exchanger 3 from the lower end of the liquid inlet pipe 8. The refrigerant will first impact the primary distribution plate 52, and some of the refrigerant will pass through the hole of the second through hole 511 and enter below it. At the same time, some of the refrigerant will flow downward from the periphery of the primary distribution plate 52, the side plate 55, and the end plate 56. Finally, the refrigerant is evenly distributed through the first through hole 54 on the surface of the secondary distribution plate 53 and discharged downward. At this time, the refrigerant area between several groups of equally spaced heat dissipation fins 6 is uniform, and the dry ice particles are also tend to be uniform. This makes the cooling effect of the dry ice bath on the heat dissipation fins 6 and the tertiary heat exchange tube 7 more uniform and stable. During use, the refrigerant and the dry ice particles contained in the refrigerant can be made more uniform. When the refrigerant passes between the heat dissipation fins 6 and the three-stage heat exchange tubes 7, it flows through the liquid outlet pipe 9 into the interior of the guide pipe 10 and finally flows into the interior of the circulation box 4, thus forming a circulation. Due to the characteristic of dry ice particles evaporating when the temperature rises, the pressure inside the circulation box 4 can be balanced through the balance valve 13. At the same time, dry ice particles can be replenished at regular intervals through the ice supply pipe 14 to maintain the temperature of the refrigerant at all times to meet the cooling requirements of the last gradient. During use, the refrigerant impacts the secondary distribution plate 53, causing it and the sleeve pipe 57 to move downwards a certain distance. At this time, the adjusting spring 510 is stretched, and the reaction force of the adjusting spring 510 pulls the secondary distribution plate 53 upwards. This promotes the circulation of the refrigerant. The sleeve pipe 57, the fixed column 51, the guide column 58, and the connecting column 59 maintain the stability of the vertical movement of the secondary distribution plate 53, promoting the fluidity of the refrigerant and resulting in better uniformity of refrigerant distribution.

[0023] It should be understood that in this application, all rotating, sliding, meshing, belt-driven and other moving parts are well lubricated and not prone to slippage or wear, and each part is provided with a corresponding protective shell. However, in the accompanying drawings of this application, the connection state of each moving part is not shown. It should also be understood that all parts in this application are made of metal or plastic materials with suitable strength in the relevant field to ensure that their structural rigidity meets the actual requirements.

[0024] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A nitrogen oxide gradient cooling and oxidation system, comprising a primary heat exchanger (1), wherein the primary heat exchanger (1) is connected to a secondary heat exchanger (2) via a pipe, characterized in that, The secondary heat exchanger (2) is connected to the tertiary heat exchanger (3) via a pipe. The other side of the tertiary heat exchanger (3) is connected to a circulation tank (4) via a pipe. The tertiary heat exchanger (3) has heat dissipation fins (6) fixedly connected in the middle of its interior. The outer surface of the heat dissipation fins (6) is interlaced with tertiary heat exchange tubes (7). The tertiary heat exchanger (3) has a flow distribution structure (5) connected inside its shell. The circulation tank (4) is used to cooperate with the circulating liquid and dry ice particles of the tertiary heat exchanger (3) to realize a dry ice bath inside the tertiary heat exchanger (3). The flow splitting structure (5) includes a fixed column (51) fixedly connected to the inner wall surface of the upper end of the shell of the three-stage heat exchanger (3). A first-stage flow splitting plate (52) is fixedly connected to the surface of the fixed column (51). A second-stage flow splitting plate (53) is connected below the first-stage flow splitting plate (52). A sleeve pipe (57) is connected between the fixed column (51) and the second-stage flow splitting plate (53). A first through hole (54) is opened on the outer surface of the second-stage flow splitting plate (53). A second through hole (511) is opened on the outer surface of the first-stage flow splitting plate (52). Side plates (55) are fixedly connected to both sides of the first-stage flow splitting plate (52). End plates (56) are fixedly connected to both ends of the first-stage flow splitting plate (52).

2. The nitrogen oxide gradient cooling and oxidation system according to claim 1, characterized in that, The fixed column (51) is fixedly connected to the sleeve (57), and the sleeve (57) is fixedly connected to the secondary diversion plate (53).

3. The nitrogen oxide gradient cooling and oxidation system according to claim 1, characterized in that, The sleeve pipe (57) is a hollow structure. An adjusting spring (510) is connected between the lower end of the fixed column (51) and the secondary flow divider plate (53). A guide column (58) is fixedly connected to the upper inner wall surface of the shell of the tertiary heat exchanger (3). A sleeve column (59) is connected between the secondary flow divider plate (53) and the guide column (58).

4. The nitrogen oxide gradient cooling and oxidation system according to claim 2 or 3, characterized in that, The number of fixed columns (51) is several groups and they are arranged in an array. The number of sleeves (57) is equal to the number of fixed columns (51). The side plate (55) is set with an outward inclined structure. The end plate (56) is perpendicular to the first-stage diversion plate (52).

5. The nitrogen oxide gradient cooling and oxidation system according to claim 4, characterized in that, The number of the second through holes (511) on the surface of the first-stage flow divider (52) is several groups and distributed in a ring array. The number of the first through holes (54) is several groups and distributed in an array. The diameter of the several groups of first through holes (54) is distributed in a structure where the diameter is smaller in the middle and larger on both sides.

6. The nitrogen oxide gradient cooling and oxidation system according to claim 3, characterized in that, The sleeve (57) slides up and down along the length of the fixed column (51). The adjusting spring (510) is located inside the sleeve (57). The upper and lower elastic ends of the adjusting spring (510) are fixedly connected to the fixed column (51) and the secondary diversion plate (53) respectively. The secondary diversion plate (53) moves downward by the impact of liquid and dry ice particles. The position of the secondary diversion plate (53) is reset by the adjusting spring (510).

7. The nitrogen oxide gradient cooling and oxidation system according to claim 6, characterized in that, The socket (59) is a hollow columnar structure, and the inner diameter of the socket (59) matches the diameter of the guide post (58). The socket (59) slides up and down along the guide post (58). The guide post (58) and the socket (59) are used to maintain the stability of the up and down movement of the secondary flow divider (53). There are two sets of both the guide post (58) and the socket (59) and they are symmetrically distributed.

8. The nitrogen oxide gradient cooling and oxidation system according to claim 1, characterized in that, The upper and lower ends of the three-stage heat exchanger (3) are respectively fixedly connected to an inlet pipe (8) and an outlet pipe (9). The upper and lower ends of the circulation tank (4) are respectively fixedly connected to a circulation pipe (11) and a guide pipe (10). The circulation pipe (11) is fixedly connected to the inlet pipe (8), and the outlet pipe (9) is fixedly connected to the guide pipe (10). The circulation pump (12) is fixedly connected inside the circulation tank (4). The output end of the circulation pump (12) is fixedly connected to the lower end of the circulation pipe (11) through a pipeline. The outer surface of the circulation tank (4) is fixedly connected to a balance valve (13) and an ice supply pipe (14). 14), the balance valve (13) is used to balance the air pressure inside the circulation tank (4), the ice supply pipe (14) is used to add dry ice particles, the outer surface of the first-stage heat exchanger (1) is fixedly connected to the oxygen supply pipe (15) and the first-stage heat exchange pipeline (16), the oxygen supply pipe (15) is used to inject oxygen, the outer surface of the second-stage heat exchanger (2) is fixedly connected to the second-stage heat exchange pipeline (17), the water outlet end of the first-stage heat exchange pipeline (16) is fixedly connected to the water outlet end of the second-stage heat exchange pipeline (17), and the water outlet end of the second-stage heat exchange pipeline (17) is fixedly connected to the third-stage heat exchange pipe (7).

Images