Heat exchanger for pyromellitic dianhydride

Abstract

The invention discloses a heat exchanger for pyromellitic dianhydride, and belongs to the field of heat exchange.The heat exchanger comprises a first shell and a heat exchange assembly connected to the interior of the first shell, a first valve body is connected to the middle of the interior of the first shell, and the interior of the first shell is divided into two inner cavities by the first valve body; an inlet I, an inlet II, an outlet III and an outlet V which are communicated with one inner cavity are formed in the outer surface of the shell I, and an inlet III, an outlet II, an outlet IV and an inlet IV which are communicated with the other inner cavity are also formed in the outer surface of the shell I; a three-section heat exchange scheme is adopted, part of heat flow is shunted to the middle section at the moment of high heat release, excessive heat can be absorbed, sudden increase of temperature difference of a main tube nest is prevented, the temperature of gas buffered by the middle section is smoother, pressure drop and temperature drop are both within a controllable range when the gas is fed into the rear section for fine cooling, conventional tube nests are protected, hardening is prevented, and the service life of the gas is prolonged. The main process is free from full-amount high-temperature impact, and the amplitude of thermal expansion and cooling shrinkage of the material is reduced.

Description

Technical Field

[0001] The present invention relates to the field of heat exchange, and more particularly to a heat exchanger for pyromellitic dianhydride. Background Art

[0002] Pyromellitic Dianhydride (PMDA) is an important organic compound. Its main synthesis routes include pyromellitic acid dehydration and durene vapor-phase oxidation. Durene vapor-phase oxidation is currently the most commonly used industrial method due to its simplified process, lower energy consumption and higher yield.

[0003] In the process of preparing pyromellitic dianhydride, a heat exchanger is needed to cool the high-temperature reaction products (including PMDA, CO2, H2O, etc.). At present, most of the heat exchangers used in the production of pyromellitic dianhydride are tubular heat exchangers. For example, the prior art (Chinese utility model patent with announcement number CN208432130U) discloses a heat exchanger for pyromellitic dianhydride, which uses heat exchange tubes to achieve heat exchange. Although it can achieve a certain heat exchange effect, it is not suitable for gas-phase oxidation reaction to produce high-temperature reaction products (gaseous durenyl is mixed with preheated air in proportion and enters a fixed catalyst filled chamber). During the gas-phase oxidation reaction in a bed or fluidized bed reactor, the conversion rate and heat release intensity of the gas-phase oxidation reaction fluctuate dramatically with slight changes in feed concentration, catalyst activity or feed temperature. Occasional "exothermic peaks" will instantly increase the gas temperature and heat flux, resulting in an operating condition where the instantaneous heat flux density or fluid temperature drop exceeds the capacity of conventional tube arrays. This will cause a sudden increase in the temperature difference of the main tube array when the high-temperature reaction products enter the heat exchanger for cooling, causing expansion differences between the tube side and the shell side, and high stress concentration at the welds between the tube sheet and the tube, and at the expansion joints. After repeated alternations of high and low temperatures, these weak points are prone to microcracks, which develop into tube sheet leakage or weld loosening. Summary of the Invention

[0004] In view of the problems existing in the prior art, the object of the present invention is to provide a heat exchanger for pyromellitic dianhydride.

[0005] To solve the above problems, the present invention adopts the following technical solutions.

[0006] A heat exchanger for pyromellitic dianhydride, comprising a shell and a heat exchange component connected to the inside of the shell.

[0007] The middle portion of the housing is connected to a valve body 1, which divides the interior of the housing into two inner chambers. The outer surface of the housing is provided with an inlet 1, an inlet 2, an outlet 3, and an outlet 5, which are connected to one of the inner chambers. The outer surface of the housing is also provided with an inlet 3, an outlet 2, an outlet 4, and an inlet 4, which are connected to the other inner chamber. Sensors are fixedly connected to the inner wall of the inlet 1, the inner wall of the inlet 3, and both sides of the valve body 1.

[0008] It also includes a peak reduction component connected to the outlet five and the inlet four, and the peak reduction component includes a shell two fixedly connected to the lower ends of the outlet five and the inlet four, two connectors fixedly connected to the inside of the shell two and respectively connected to the outlet five and the inlet four, two valve bodies two respectively connected to the inside of the two connectors, and a phase change heat storage part with both ends respectively fixed to the other ends of the two connectors.

[0009] Furthermore, the number of the heat exchange components is two and they are respectively located in two inner cavities, and the heat exchange components include two discs and a plurality of heat exchange tubes four respectively fixed to the two discs at both ends, two of the discs are respectively welded to inlet one and outlet three, and the other two discs are respectively welded to inlet three and outlet four.

[0010] Furthermore, the inner walls of the two inner cavities are fixed with multiple partitions 1, and the multiple partitions 1 are alternately arranged to delay the retention time of the airflow in the inner cavity, and the multiple partitions are connected to the outside of the multiple heat exchange tubes 4.

[0011] Furthermore, the phase change heat storage part includes a shell three whose two ends are respectively fixed to two joints, a plurality of heat exchange tubes one fixed to the inside of the shell three and connected to the two joints, and a heat conductive isolation ring fixed to the inside of the shell three, and the heat conductive isolation ring divides the internal space of the shell three into cavity one and cavity two, the cavity one is used to encapsulate the heat conductive fluid and the phase change microcapsules, and the cavity two is used to encapsulate the molten salt phase change material.

[0012] Furthermore, a heat exchange tube 2 is provided inside the cavity 1, and the heat exchange tube 2 is located outside the multiple heat exchange tubes 1. A heat exchange tube 3 is provided inside the cavity 2, and the three sets of heat exchange tubes are arranged outside the heat-conducting isolation ring. Two groups of pump bodies 1 are fixedly connected to the front and back of the shell 2. Both ends of the heat exchange tube 2 pass through the heat-conducting isolation ring, the shell 3 and the shell 2 and are connected to one group of pump bodies 1. Both ends of the heat exchange tube 3 pass through the shell 3 and the shell 2 and are connected to the other group of pump bodies 1.

[0013] Furthermore, a plurality of fins are integrally formed on the outer surface of the heat-conducting isolation ring, and a heat-conducting net is fixedly connected to the other end of the plurality of fins. The heat-conducting net is annular and is sleeved on the outside of the heat-conducting isolation ring and located inside the second cavity.

[0014] Furthermore, the interior of the cavity is connected to a heat storage enhancement part, and the heat storage enhancement part includes a plurality of heat exchange sleeves rotatably connected to the outside of the plurality of heat exchange tubes, a plurality of flanges integrally formed on the outside of the plurality of heat exchange sleeves, a partition 2 and a partition 3 sleeved on the outside of the plurality of heat exchange sleeves and welded with the outer wall and the inner wall of the heat-conducting isolation ring, a gear ring rotatably connected to one side of the partition 2 and welded to one end of one of the heat exchange sleeves, a gear 2 rotatably connected to the inner wall of the shell 3 and meshing with the gear ring, a plurality of gears 1 rotatably connected to one side of the partition 3 and respectively welded with the other end of the plurality of heat exchange sleeves, one of the gears 1 meshes with the other plurality of gears 1, a motor is fixed to one side of the outer surface of the shell 2, and the output shaft of the motor passes through the shell 2, the joint, the shell 3 and is fixed to the gear 2.

[0015] Furthermore, dynamic sealing is performed between the motor output shaft and shell 2, the joint, and shell 3, dynamic sealing is performed between the multiple heat exchange sleeves and partition 2 and partition 3, sealing is performed between the heat exchange tube 2 and the heat conductive isolation ring, shell 3, and shell 2, and sealing is performed between the heat exchange tube 3 and shell 3 and shell 2.

[0016] Furthermore, a heat release component is also connected to the outside of the shell three, and the heat release component includes a hollow casing fixedly connected to the outside of the shell three, an insulation layer wrapped around the outside of the hollow casing, a flow channel opened in the hollow casing, a conductive extension part fixedly connected to the inner wall of the hollow casing and passing through the shell three, the heat-conducting net, and the heat-conducting isolation ring and extending into the cavity one. The lower end of the shell two is fixedly connected to two pump bodies two, and the two pump bodies two are connected to the flow channel.

[0017] Furthermore, a sealing treatment is performed between the conductive extension portion, the shell body 3, and the heat-conducting isolation ring.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] (1) This scheme adopts a three-stage heat exchange scheme. The front section adopts gas-gas heat exchange pre-cooling, the rear section adopts gas-liquid heat exchange cooling, and the middle section adopts phase change heat storage. The temperature of the high-temperature reaction product is detected by an internal sensor at the inlet. Under normal conditions, the front section and the rear section work together to achieve heat exchange. When the load is high, the middle section is switched so that the airflow enters the middle section from the front section first and then enters the rear section from the middle section. At the moment of high heat release, part of the heat flow is diverted to the middle section, which can absorb excessive heat and prevent the temperature difference of the main tube from increasing suddenly. The gas temperature after being buffered by the middle section is more stable. When it is sent to the rear section for fine cooling, the pressure drop and temperature drop are both within a controllable range, which helps to protect the conventional tubes and prevent caking. The main process is protected from the full-scale high-temperature impact, the amplitude of material expansion and cooling contraction is reduced, and the life of welds and expansion joints is significantly extended. When the load is low, the middle section can gradually release heat back to the process to achieve "peak shaving and valley filling" and improve the average utilization rate and energy efficiency of the heat exchange system.

[0020] (2) The phase change heat storage part of this scheme adopts a double-layer design. The phase change heat storage scheme in cavity one adopts phase change microcapsules plus inert carrier fluid, and the phase change heat storage scheme in cavity two adopts molten salt phase change materials. PCMs with different melting points are filled into the two cavities respectively. The PCM in cavity one is melted first, and then the PCM in cavity two is melted by heat transfer. The step-by-step heat absorption is more efficient. Since inert carrier fluid is used for heat conduction in cavity one, compared with traditional solid phase change materials (solid at room temperature, melted into liquid after absorbing heat, and re-solidified when releasing heat), the inert carrier fluid can quickly conduct heat to multiple phase change microcapsules, thereby improving the heat storage effect and shortening the time required for heat storage, thereby improving the efficiency of heat absorption in the middle section. The heat transfer method of fins and heat conduction nets is used in cavity two, which can quickly conduct heat to the material area away from the isolation ring, improving the heat storage efficiency and shortening the heat storage time.

[0021] (3) This solution is provided with a heat storage enhancement part, which is driven by the motor to rotate gear 2, which drives one of the heat exchange sleeves to rotate. The rotating heat exchange sleeve drives the other heat exchange sleeves to rotate through gear 1. The flange on the outside of the heat exchange sleeve can flip the phase change microcapsules in the inert carrier fluid, continuously driving the phase change microcapsules to move, so that the phase change material in cavity 1 maintains continuous flow and convective heat transfer, thereby improving the heat transfer coefficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the front structure of the present invention;

[0023] Figure 2 It is a schematic diagram of the back structure of the present invention;

[0024] Figure 3 is a cross-sectional view of a housing of the present invention;

[0025] Figure 4 Schematic diagram of the heat exchange assembly structure of the present invention;

[0026] Figure 5 It is a cross-sectional view of the phase change heat storage portion of the present invention;

[0027] Figure 6 Schematic diagram of the internal structure of the housing of the present invention;

[0028] Figure 7 This is a schematic structural diagram of the heat storage enhancement portion of the present invention;

[0029] Figure 8 This is a schematic structural diagram of the ring gear and gear 2 of the present invention;

[0030] Figure 9 Schematic diagram of the fin structure of the present invention;

[0031] Figure 10 Schematic diagram of the heat conduction network structure of the present invention;

[0032] Figure 11 Schematic diagram of the third structure of the housing of the present invention;

[0033] Figure 12 It is a schematic structural diagram of the heat release component of the present invention.

[0034] Description of the numbers in the figure:

[0035] 1. Shell 1; 11. Inlet 1; 12. Inlet 3; 13. Inlet 2; 14. Outlet 2; 15. Outlet 3; 16. Outlet 4; 17. Outlet 5; 18. Inlet 4; 19. Partition 1; 2. Peak reduction component; 21. Shell 2; 22. Connector; 23. Phase change heat storage unit; 231. Shell 3; 232. Heat exchange tube 1; 233. Thermal isolation ring; 234. Cavity 1; 235. Heat exchange tube 2; 236. Cavity 2; 237. Heat exchange tube 3; 2 4. Pump body 1; 25. Heat storage enhancement part; 251. Partition 2; 252. Partition 3; 253. Heat exchange jacket; 254. Flange; 255. Gear 1; 256. Ring gear; 257. Gear 2; 258. Motor; 26. Fin; 27. Heat conduction network; 28. Heat release component; 281. Hollow sleeve; 282. Conductive extension; 29. ​​Pump body 2; 3. Sensor; 4. Heat exchange component; 41. Disc; 42. Heat exchange tube 4; 5. Valve body 1; 6. Valve body 2. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0037] See also Figures 1 to 11 A heat exchanger for pyromellitic dianhydride includes a shell 1 and a heat exchange component 4 connected to the inside of the shell 1.

[0038] A valve body 5 is connected to the middle of the housing 1, and the valve body 5 divides the housing 1 into two inner chambers. The outer surface of the housing is provided with an inlet 11, an inlet 2 13, an outlet 3 15, and an outlet 5 17 connected to one of the inner chambers. The outer surface of the housing is also provided with an inlet 3 12, an outlet 2 14, an outlet 4 16, and an inlet 4 18 connected to the other inner chamber. Sensors 3 are fixed to the inner wall of the inlet 11, the inner wall of the inlet 3 12, and both sides of the valve body 5.

[0039] It also includes a peak reduction component 2 connected to the fifth outlet 17 and the fourth inlet 18, and the peak reduction component 2 includes a shell 21 fixedly connected to the lower ends of the fifth outlet 17 and the fourth inlet 18, two connectors 22 fixedly connected to the inside of the second shell 21 and respectively connected to the fifth outlet 17 and the fourth inlet 18, two valve bodies 26 respectively connected to the inside of the two connectors 22, and a phase change heat storage part 23 with both ends fixedly connected to the other ends of the two connectors 22.

[0040] The heat exchange components 4 are in two groups and are located in two inner cavities respectively. The heat exchange components 4 include two discs 41 and a plurality of heat exchange tubes 42 fixedly connected to the two discs 41 at both ends. Two of the discs 41 are respectively welded to the inlet 11 and the outlet 3 15, and the other two discs 41 are respectively welded to the inlet 3 12 and the outlet 4 16.

[0041] The inner walls of the two inner cavities are fixed with multiple partitions 19, and the multiple partitions 19 are alternately arranged to delay the retention time of the airflow in the inner cavity. The multiple partitions 19 are sleeved on the outside of the multiple heat exchange tubes 42.

[0042] By adopting the above technical solution, the high-temperature reaction product generated by the gas-phase oxidation reaction enters the interior of the shell 1 from the second inlet 13, and its temperature is detected by the sensor 3 on the inner wall of the second inlet 13. When the temperature is in the normal temperature range, the valve body 5 opens to connect the two inner cavities inside the shell 1. At this time, the high-temperature reaction product is first in the left inner cavity of the shell 1, and the heat exchange gas enters the left heat exchange component 4 from the first inlet 11, and exchanges heat with the high-temperature reaction product in the left inner cavity of the shell 1 through the heat exchange pipe 44. The gas after heat exchange The liquid is discharged from the outlet 3 15, and the high-temperature reaction product is pre-cooled by the heat exchange component 4 (gas heat exchange) on the left. The high-temperature reaction product enters the right inner cavity of the shell 1 from the left inner cavity through the valve body 15. The heat exchange liquid enters the heat exchange component 4 on the right from the inlet 3 12, exchanges heat with the high-temperature reaction product in the right inner cavity of the shell 1 through the heat exchange pipe 4 42, and then is discharged from the outlet 4 16. The high-temperature reaction product is cooled for a second time by the heat exchange component 4 (liquid heat exchange) on the right. When the temperature exceeds the normal temperature range, the valve body 1 5 is closed, valve body 2 6 is opened, and the high-temperature reaction product after pre-cooling in the left inner cavity of shell 1 enters the left joint 22 from outlet 5 17, and enters the phase change heat storage part 23 from the left joint 22. The high-temperature reaction product is cooled twice by the phase change heat storage material in the phase change heat storage part 23. The high-temperature reaction product passing through the phase change heat storage part 23 enters the inlet 4 18 from the right joint 22, and then cools the high-temperature reaction product three times by the heat exchange component 4 in the right inner cavity of shell 1. At the moment of high heat release, part of the heat flow is diverted to the middle section (Peak reduction component 2) can absorb excess heat and prevent a sudden increase in the temperature difference of the main tubes. The temperature of the gas after being buffered by the middle section is more stable. When it is sent to the rear section (the right inner cavity of the shell 1) for fine cooling, the pressure drop and temperature drop are both within a controllable range, which helps to protect conventional tubes and prevent hardening, and protect the main process from the full high-temperature impact. The amplitude of material expansion due to heat and contraction due to cooling is reduced, and the service life of welds and expansion joints is significantly extended. When the load is low, the middle section can gradually release heat back to the process to achieve "peak shaving and valley filling" and improve the average utilization rate and energy efficiency of the heat exchange system.

[0043] like Figure 5 、 Figures 9-11 As shown, the phase change heat storage part 23 includes a shell three 231 whose two ends are respectively fixed to two joints 22, a plurality of heat exchange tubes 1 232 fixed to the inside of the shell three 231 and connected to the two joints 22, and a heat conductive isolation ring 233 fixed to the inside of the shell three 231. The heat conductive isolation ring 233 divides the internal space of the shell three 231 into a cavity one 234 and a cavity two 236. The cavity one 234 is used to encapsulate the heat conductive fluid and the phase change microcapsules, and the cavity two 236 is used to encapsulate the molten salt phase change material.

[0044] A heat exchange tube 2 235 is provided inside the cavity 1 234, and the heat exchange tube 2 235 is located outside the multiple heat exchange tubes 1 232. A heat exchange tube 3 237 is provided inside the cavity 2 236, and the heat exchange tube 3 237 is sleeved on the outside of the heat-conducting isolation ring 233. Two groups of pump bodies 1 24 are fixedly connected to the front and back of the shell 2 21. Both ends of the heat exchange tube 2 235 pass through the heat-conducting isolation ring 233, the shell 3 231 and the shell 2 21 and are connected to one group of pump bodies 1 24. Both ends of the heat exchange tube 3 237 pass through the shell 3 231 and the shell 2 21 and are connected to the other group of pump bodies 1 24.

[0045] The outer surface of the heat-conducting isolation ring 233 is integrally formed with a plurality of fins 26 , and the other end of the plurality of fins 26 is fixedly connected to a heat-conducting mesh 27 . The heat-conducting mesh 27 is annular and is sleeved on the outside of the heat-conducting isolation ring 233 and located inside the second cavity 236 .

[0046] By adopting the above technical solution, when the high-temperature reactant entering the phase change heat storage part 23 passes through the heat exchange tube 1 232, the phase change heat storage material in the cavity 1 234 can absorb the heat of the high-temperature reactant and store the heat, so that the high-temperature reactant is cooled down. The phase change heat storage part 23 adopts a double-layer design. The phase change heat storage solution in the cavity 1 234 adopts phase change microcapsules plus an inert carrier fluid, and the phase change heat storage solution in the cavity 2 236 adopts a molten salt phase change material. PCMs with different melting points are filled into the two cavities respectively, and the PCM in the cavity 1 234 is melted first, and then heat is transferred to melt the cavity 2 236. The PCM in 36 is more efficient in absorbing heat in steps. At the same time, since an inert carrier fluid is used for heat conduction in cavity one 234, compared with traditional solid phase change materials (solid at room temperature, melts into liquid after absorbing heat, and re-solidifies when releasing heat), the inert carrier fluid can quickly conduct heat to multiple phase change microcapsules, thereby improving the heat storage effect and shortening the time required for heat storage, thereby improving the efficiency of heat absorption in the middle section. The heat transfer method of fins 26 and heat conductive mesh 27 is used in cavity two 236, which can quickly conduct heat to the material area away from the heat conductive isolation ring 233, thereby improving the heat storage efficiency and shortening the heat storage time.

[0047] like Figure 3 、 Figure 5 、 Figure 7 and Figure 8As shown, the interior of the cavity 1 234 is connected to a heat storage enhancement part 25, and the heat storage enhancement part 25 includes a plurality of heat exchange sleeves 253 rotatably connected to the outside of the plurality of heat exchange tubes 1 232, a plurality of flanges 254 integrally formed on the outside of the plurality of heat exchange sleeves 253, a partition 2 251 and a partition 3 252 sleeved on the outside of the plurality of heat exchange sleeves 253 and welded to the inner wall of the heat-conducting isolation ring 233, and a gear ring rotatably connected to one side of the partition 251 and welded to one end of one of the heat exchange sleeves 253. 256, gear two 257 rotatably connected to the inner wall of shell three 231 and meshing with the ring gear 256, multiple gear ones 255 rotatably connected to one side of partition three 252 and respectively welded to the other ends of multiple heat exchange sleeves 253, one of the gear one 255 meshes with the other multiple gear ones 255, a motor 258 is fixedly connected to one side of the outer surface of the shell two 21, and the output shaft of the motor 258 passes through the shell two 21, the joint 22, the shell three 231 and is fixedly connected to the gear two 257.

[0048] Dynamic sealing is performed between the output shaft of the motor 258 and the shell 2 21, the joint 22, and the shell 3 231. Dynamic sealing is performed between the multiple heat exchange sleeves 253 and the partition 2 251 and the partition 3 252. Sealing is performed between the heat exchange tube 2 235 and the heat conductive isolation ring 233, the shell 3 231, and the shell 2 21. Sealing is performed between the heat exchange tube 3 237 and the shell 3 231 and the shell 2 21.

[0049] By adopting the above technical solution, the motor 258 drives the gear 2 257 to rotate, and the rotation of the gear 2 257 drives the ring gear 256 and one of the heat exchange sleeves 253 to rotate. When the rotating heat exchange sleeve 253 rotates, the gear 1 255 at the other end can drive the remaining gears 1 255 to rotate, thereby driving the remaining heat exchange sleeves 253 to rotate in the cavity 1 234. The flange 254 on the outside of the heat exchange sleeve 253 can make the phase change microcapsules in the inert carrier fluid in the cavity 1 234 flip, continuously driving the phase change microcapsules to move, so that the phase change material in the cavity 1 234 maintains continuous flow and convective heat transfer, thereby improving the heat transfer coefficient.

[0050] like Figure 3 、 Figure 5 、 Figure 12 As shown, the outside of the shell three 231 is also connected to a heat release component 28, and the heat release component 28 includes a hollow casing 281 fixed to the outside of the shell three 231, an insulation layer wrapped around the outside of the hollow casing 281, a flow channel opened in the hollow casing 281, and a conductive extension part 282 fixed to the inner wall of the hollow casing 281 and passing through the shell three 231, the heat conductive net 27, and the heat conductive isolation ring 233 and then extending into the cavity one 234. The lower end of the shell two 21 is fixed to two pump bodies two 29, and the two pump bodies two 29 are both connected to the flow channel.

[0051] The conductive extension portion 282 is sealed against the third shell 231 and the heat-conducting isolation ring 233 .

[0052] By adopting the above technical solution, when the heat storage material inside cavity one 234 and cavity two 236 quickly reaches the saturation temperature, if the demand for cooling the high-temperature reactants cannot be met at this time, the heat of the phase change material in cavity one 234 and cavity two 236 can be conducted to the hollow sleeve 281 through the conductive extension 282, and one of the pump bodies two 29 can pump liquid into the flow channel for heat exchange to cool the hollow sleeve 281, and the other pump body two 29 can speed up the pumping out of the liquid in the flow channel, thereby cooling the heat storage material in cavity one 234 and cavity two 236, so that it can continue to absorb the heat of the high-temperature reactants and store heat, thereby increasing the amount of heat absorption. It should be noted here that the outside of the hollow sleeve 281 is wrapped with insulation material (which is a mature existing technology and will not be repeated here). During normal use, the heat of the phase change material in cavity 1 234 and cavity 2 236 is conducted to the hollow sleeve 281 through the conductive extension 282, and the insulation material can prevent heat loss from the hollow sleeve 281.

[0053] Instructions for use: The high-temperature reaction product generated by the gas-phase oxidation reaction enters the interior of the shell 1 from the inlet 2 13, and its temperature is detected by the sensor 3 on the inner wall of the inlet 2 13. When the temperature is in the normal temperature range, the valve body 1 5 is opened to connect the two inner cavities inside the shell 1. At this time, the high-temperature reaction product is first in the inner cavity on the left side of the shell 1, and the heat exchange gas enters the heat exchange component 4 on the left side from the inlet 11, and exchanges heat with the high-temperature reaction product in the inner cavity on the left side of the shell 1 through the heat exchange tube 4 42. The gas after heat exchange is discharged from the outlet 3 15, and the high-temperature reaction product is pre-cooled by the heat exchange component 4 on the left side (gas heat exchange). The high-temperature reaction product enters the right inner cavity of the shell 1 from the left inner cavity of the shell 1 through the valve body 1 5, and the heat exchange liquid enters from the inlet 3 12 In the heat exchange component 4 on the right, heat is exchanged with the high-temperature reaction product in the right inner cavity of the shell 1 through the heat exchange tube 4 42, and then discharged from the outlet 4 16. The high-temperature reaction product is cooled twice by the heat exchange component 4 on the right (liquid heat exchange); when the temperature exceeds the normal temperature range, the valve body 1 5 is closed and the valve body 2 6 is opened. The high-temperature reaction product in the left inner cavity of the shell 1 after pre-cooling enters the left joint 22 from the outlet 5 17, and enters the phase change heat storage part 23 from the left joint 22. The high-temperature reaction product is cooled twice by the phase change energy storage material in the phase change heat storage part 23. The high-temperature reaction product passing through the phase change heat storage part 23 enters the inlet 4 18 from the right joint 22, and then cools the high-temperature reaction product three times by the heat exchange component 4 in the right inner cavity of the shell 1.

[0054] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any person skilled in the art who, within the technical scope disclosed by the present invention, makes equivalent substitutions or modifications based on the technical solutions and improved concepts of the present invention shall be covered by the scope of protection of the present invention.

Claims

1. A heat exchanger for pyromellitic dianhydride, comprising a shell (1) and a heat exchange component (4) connected to the interior of the shell (1), characterized in that: The middle part of the shell (1) is connected to a valve body (5), and the valve body (5) divides the shell (1) into two inner chambers. The outer surface of the shell (1) is provided with an inlet (11), an inlet (2) (13), an outlet (3) (15), and an outlet (5) (17) connected to one of the inner chambers. The outer surface of the shell (1) is also provided with an inlet (3) (12), an outlet (2) (14), an outlet (4) (16), and an inlet (4) (18) connected to the other inner chamber. The inner wall of the inlet (11), the inner wall of the inlet (3) (12), and both sides of the valve body (5) are fixedly connected with sensors (3). The peak reduction assembly (2) is also included and connected to the fifth outlet (17) and the fourth inlet (18). The peak reduction assembly (2) includes a second shell (21) fixedly connected to the lower ends of the fifth outlet (17) and the fourth inlet (18), two joints (22) fixedly connected to the interior of the second shell (21) and respectively connected to the fifth outlet (17) and the fourth inlet (18), two valve bodies (2) respectively connected to the interior of the two joints (22), and a phase change heat storage part (23) with two ends respectively fixedly connected to the other ends of the two joints (22).

2. A heat exchanger for pyromellitic dianhydride according to claim 1, characterized in that: The heat exchange components (4) are in two groups and are respectively located in two inner cavities, and the heat exchange components (4) include two disks (41) and a plurality of heat exchange tubes (42) fixedly connected to the two disks (41) at both ends, wherein two of the disks (41) are respectively welded to the inlet one (11) and the outlet three (15), and the other two of the disks (41) are respectively welded to the inlet three (12) and the outlet four (16).

3. A heat exchanger for pyromellitic dianhydride according to claim 2, characterized in that: The inner walls of the two inner cavities are fixed with a plurality of partition plates (19), and the plurality of partition plates (19) are arranged alternately to delay the retention time of the airflow in the inner cavity. The plurality of partition plates (19) are sleeved on the outside of the plurality of heat exchange tubes (42).

4. A heat exchanger for pyromellitic dianhydride according to claim 3, characterized in that: The phase change heat storage part (23) includes a shell three (231) whose two ends are respectively fixed to two joints (22), a plurality of heat exchange tubes (232) fixed inside the shell three (231) and connected to the two joints (22), and a heat conductive isolating ring (233) fixed inside the shell three (231). The heat conductive isolating ring (233) divides the internal space of the shell three (231) into a cavity one (234) and a cavity two (236). The cavity one (234) is used to encapsulate the heat conductive fluid and the phase change microcapsules, and the cavity two (236) is used to encapsulate the molten salt phase change material.

5. A heat exchanger for pyromellitic dianhydride according to claim 4, characterized in that: A heat exchange tube 2 (235) is provided inside the cavity 1 (234), and the heat exchange tube 2 (235) is located outside the plurality of heat exchange tubes 1 (232). A heat exchange tube 3 (237) is provided inside the cavity 2 (236), and the heat exchange tube 3 (237) is sleeved on the outside of the heat-conducting isolating ring (233). Two groups of pump bodies 1 (24) are fixedly connected to the front and back of the shell 2 (21). Both ends of the heat exchange tube 2 (235) pass through the heat-conducting isolating ring (233), the shell 3 (231) and the shell 2 (21) and are connected to one group of pump bodies 1 (24). Both ends of the heat exchange tube 3 (237) pass through the shell 3 (231) and the shell 2 (21) and are connected to the other group of pump bodies 1 (24).

6. A heat exchanger for pyromellitic dianhydride according to claim 5, characterized in that: The outer surface of the heat-conducting isolation ring (233) is integrally formed with a plurality of fins (26), and the other end of the plurality of fins (26) is fixedly connected with a heat-conducting net (27), and the heat-conducting net (27) is annular and is sleeved on the outside of the heat-conducting isolation ring (233) and located inside the second cavity (236).

7. A heat exchanger for pyromellitic dianhydride according to claim 6, characterized in that: The cavity 1 (234) is internally connected to a heat storage enhancement part (25), and the heat storage enhancement part (25) includes a plurality of heat exchange sleeves (253) respectively rotatably connected to the outside of the plurality of heat exchange tubes 1 (232), a plurality of flanges (254) integrally formed on the outside of the plurality of heat exchange sleeves (253), a partition 2 (251) and a partition 3 (252) sleeved on the outside of the plurality of heat exchange sleeves (253) and having outer walls welded to the inner wall of the heat-conducting isolation ring (233), and a gear ring (256) rotatably connected to one side of the partition 2 (251) and welded to one end of one of the heat exchange sleeves (253). , a gear 2 (257) rotatably connected to the inner wall of the shell 3 (231) and meshing with the gear ring (256), a plurality of gears 1 (255) rotatably connected to one side of the partition 3 (252) and respectively welded to the other ends of the plurality of heat exchange sleeves (253), one of the gears 1 (255) meshing with the other plurality of gears 1 (255), a motor (258) fixedly connected to one side of the outer surface of the shell 2 (21), and an output shaft of the motor (258) passes through the shell 2 (21), the joint (22), the shell 3 (231) and is fixedly connected to the gear 2 (257).

8. A heat exchanger for pyromellitic dianhydride according to claim 7, characterized in that: Dynamic sealing is performed between the output shaft of the motor (258) and the second shell (21), the joint (22), and the third shell (231); dynamic sealing is performed between the plurality of heat exchange sleeves (253) and the second partition (251) and the third partition (252); sealing is performed between the second heat exchange tube (235) and the heat conductive isolation ring (233), the third shell (231), and the second shell (21); and sealing is performed between the third heat exchange tube (237) and the third shell (231) and the second shell (21).

9. A heat exchanger for pyromellitic dianhydride according to claim 8, characterized in that: The outside of the shell three (231) is also connected to a heat release component (28), and the heat release component (28) includes a hollow casing (281) fixedly connected to the outside of the shell three (231), a heat-insulating layer wrapped around the outside of the hollow casing (281), a flow channel opened in the hollow casing (281), a conductive extension portion (282) fixedly connected to the inner wall of the hollow casing (281) and extending into the cavity one (234) after passing through the shell three (231), the heat-conducting net (27), and the heat-conducting isolation ring (233). The lower end of the shell two (21) is fixedly connected to two pump bodies two (29), and the two pump bodies two (29) are both connected to the flow channel.

10. A heat exchanger for pyromellitic dianhydride according to claim 9, characterized in that: The conductive extension portion (282), the shell body (231), and the heat-conducting isolation ring (233) are sealed.

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