Heat exchange device for phthalic anhydride production

Abstract

The invention is applicable to the technical field of phthalic anhydride heat exchange devices, and provides a heat exchange device for phthalic anhydride production, which comprises a heat exchanger, an inlet and outlet pipeline arranged on the heat exchanger, a heat exchange tube bundle arranged in the heat exchanger, a baffle plate and a flow separation plate, a first heat exchange cavity, a second heat exchange cavity and a third heat exchange cavity are sequentially formed in the heat exchange sleeve, the baffle plates comprise the upper baffle plate and the lower baffle plate which are symmetrically arranged in the second heat exchange cavity, and the flow separation plates comprise the upper flow separation plate and the lower flow separation plate which are symmetrically arranged in the second heat exchange cavity. The device solves the problems that the tube bundle leaks due to resonance in the using process of the heat exchange tube bundle, and phthalic anhydride production is affected, and achieves the effects that the heat exchange tube bundle is prevented from generating resonance by installing the flow separation plates between the baffle plates, meanwhile, fluid is guided, and the probability that the heat exchange tube bundle leaks due to resonance is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of phthalic anhydride heat exchange device, and more specifically, to a heat exchange device used for phthalic anhydride production. Background Art

[0002] In the process of phthalic anhydride production, heat exchange devices, as important chemical equipment, are widely used in various process flows such as heating, cooling, condensing, evaporating, and reboiling to achieve heat transfer between fluids at different temperatures, ensuring that the reaction materials in phthalic anhydride production remain within an appropriate temperature range to meet the requirements of different physical and chemical reactions and other process conditions in the production of phthalic anhydride.

[0003] During the operation of the heat exchange device, when the steam flow and velocity passing through the heat exchange tube bundles exceed the design value, the heat exchange tube bundles with a certain elasticity will vibrate under the action of the shell side fluid disturbance force. When the frequency of the exciting force coincides with the natural vibration frequency of the tube bundle or its multiple, it will cause the heat exchange tube bundle to resonate, greatly increase the amplitude, and cause the connection between the heat exchange tube bundle and the tube sheet to be repeatedly acted upon, causing damage to the tube bundle and leakage.

[0004] Leakage of the heat exchanger tube bundle will cause a series of problems such as raw material pollution, reduced heat exchange efficiency, and reduced device service life, thus affecting the normal production of phthalic anhydride. Most existing heat exchangers reduce the probability of leakage of the heat exchanger tube bundle by increasing the tube wall thickness, regular cleaning, and controlling the flow rate, but these measures cannot solve the problem of leakage of the heat exchanger tube bundle caused by vibration. Summary of the invention

[0005] In view of the deficiencies in the prior art, the object of the present invention is to provide a heat exchange device for phthalic anhydride production, which avoids resonance of the heat exchange tube bundle by installing flow isolation plates between baffles, and at the same time guides the fluid to reduce the probability of leakage of the heat exchange tube bundle due to resonance.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A heat exchange device for phthalic anhydride production comprises a heat exchanger, inlet and outlet pipes opened on the heat exchanger, a heat exchange tube bundle arranged inside the heat exchanger, a baffle and a flow divider, wherein the heat exchanger comprises a horizontally arranged heat exchange sleeve, a first heat exchange cavity, a second heat exchange cavity and a third heat exchange cavity are sequentially arranged inside the heat exchange sleeve, the baffle comprises an upper baffle and a lower baffle symmetrically arranged inside the second heat exchange cavity, and the flow divider comprises an upper flow divider and a lower flow divider symmetrically arranged inside the second heat exchange cavity.

[0008] The present invention is further configured as follows: the upper baffles and the lower baffles are spaced apart along the length direction of the second heat exchange chamber, the upper baffles and the lower baffles are symmetrically arranged about the horizontal axis, and a group of flow partitions is arranged between each two groups of upper baffles and lower baffles.

[0009] The present invention is further configured as follows: the upper baffle plates and the lower baffle plates have the same structure and are both configured as disc structures; one end of each group of upper baffle plates is provided with an arc portion and the other end is provided with a horizontal portion; and each group of upper baffle plates and lower baffle plates are provided with baffle flow holes therethrough.

[0010] The present invention is further configured as follows: the upper flow partition and the lower flow partition are spaced apart along the length direction of the second heat exchange chamber, the upper baffle and the lower baffle are symmetrically arranged about the horizontal axis, and the upper flow partition is arranged on the top of the lower flow partition.

[0011] By adopting the above technical solution, the upper flow partition and the lower flow partition are arranged in two layers, which can not only strengthen the connection strength between the upper baffle and the lower baffle, but also increase support for the heat exchange tube bundle from the longitudinal direction, thereby increasing the natural frequency of the heat exchange tube bundle and making the fluid induced vibration frequency away from the natural frequency of the heat exchange tube bundle.

[0012] The present invention is further configured as follows: the upper flow divider and the lower flow divider have the same structure, and each group of the upper flow divider and the lower flow divider comprises mounting portions arranged on both sides and a flow guide portion arranged in the middle.

[0013] By adopting the above technical solution, when the fluid flows between the upper baffle plate and the lower baffle plate, it can also contact with the guide parts on the upper and lower baffle plates spaced apart from each other, and use the wavy structure of the guide parts to guide the fluid, thereby reducing the flow speed of the fluid in the second heat exchange chamber to a certain extent, and effectively eliminating fluid induced vibration.

[0014] The present invention is further configured as follows: mounting grooves are provided on the mounting portion at positions corresponding to the positions of the upper baffle plate and the lower baffle plate, and the shape of the mounting grooves is adapted to the shape of the upper baffle plate and the lower baffle plate.

[0015] By adopting the above technical solution, after the fluid that needs to exchange heat enters the second heat exchange chamber from the second inlet, it first passes through the baffle holes on the upper baffle plate, and then passes through the baffle holes on the lower baffle plate, so as to flow between different upper and lower baffle plates. In the process of the fluid flowing between the upper baffle plate and the lower baffle plate, it can also contact with the guide parts on the upper and lower baffle plates spaced apart from each other, and use the wavy structure of the guide parts to guide the fluid, thereby reducing the speed of the fluid flowing inside the second heat exchange chamber to a certain extent, effectively eliminating the fluid-induced vibration, further reducing the probability of vibration of the heat exchange tube bundle due to the excessively fast fluid flow rate, and finally reducing the probability of leakage of the heat exchange tube bundle.

[0016] The present invention is further configured as follows: a group of plugging plates are respectively provided at both ends of the second heat exchange cavity, and the plugging plates are provided with tube bundle through holes whose shapes are adapted to the shape of the heat exchange tube bundle.

[0017] The present invention is further configured as follows: a support seat is provided at the bottom of the heat exchange sleeve, and an inspection door is provided at one side of the heat exchange sleeve.

[0018] The present invention is further configured as follows: the inlet and outlet pipes include a first inlet, a second inlet, a first outlet and a second outlet opened on the heat exchange sleeve, the first inlet and the first outlet are both arranged at the top of the heat exchange sleeve and are respectively connected to the inside of the first heat exchange cavity.

[0019] The present invention is further configured as follows: the second inlet is arranged at the top of the heat exchange sleeve, the second outlet is arranged at the bottom of the heat exchange sleeve, and the second inlet and the second outlet are respectively communicated with the inside of the second heat exchange cavity.

[0020] The beneficial effects of the present invention are:

[0021] 1. Arranging two layers of upper and lower baffles between the upper baffle and the lower baffle can not only strengthen the connection strength between the upper and lower baffles, but also increase the support for the heat exchange tube bundle from the longitudinal direction, thereby increasing the natural frequency of the heat exchange tube bundle, making the fluid induced vibration frequency away from the natural frequency of the heat exchange tube bundle, reducing the probability of resonance between the heat exchange tube bundle and the fluid, and preventing leakage caused by the resonance of the heat exchange tube bundle, which affects the normal production of phthalic anhydride.

[0022] 2. The structure of the upper and lower flow dividers can also form longitudinal detuning baffles in the flow direction of the heat exchange tube bundle, thereby increasing the standing wave frequency, preventing acoustic resonance between the heat exchange tube bundle and the fluid, and achieving the purpose of reducing the probability of resonance of the heat exchange tube bundle. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0024] Figure 1The figure is a schematic diagram of the structure of the heat exchange device used for phthalic anhydride production according to the present invention.

[0025] Figure 2 for Figure 1 A cross-sectional view of a heat exchange apparatus for phthalic anhydride production is shown.

[0026] Figure 3 for Figure 1 Schematic diagram of the internal structure of the heat exchange device used for phthalic anhydride production.

[0027] Figure 4 for Figure 3 Schematic diagram of the structure of the heat exchange tube bundle, baffles and flow partitions shown.

[0028] Figure 5 for Figure 4 A front view of the heat exchange tube bundle, baffles and dividers is shown.

[0029] Figure 6 for Figure 4 Schematic diagram of the structure of the baffle shown.

[0030] Figure 7 for Figure 4 Schematic diagram of the structure of the flow partition shown.

[0031] Figure 8 for Figure 7 Front view of the flow cutoff shown.

[0032] Description of reference numerals: 1, base; 11, maintenance ladder;

[0033] 2. Heat exchanger; 21. Heat exchange sleeve; 211. First heat exchange chamber; 212. Second heat exchange chamber; 213. Third heat exchange chamber; 22. Plug plate; 221. Tube bundle through hole; 23. Inspection door; 24. Support seat;

[0034] 3. Inlet and outlet pipes; 31. First inlet; 32. Second inlet; 33. First outlet; 34. Second outlet;

[0035] 4. Heat exchange tube bundle;

[0036] 5. baffle; 51. upper baffle; 52. lower baffle; 53. arc-shaped portion; 54. horizontal portion; 55. baffle flow hole;

[0037] 6. Flow separator; 61. Upper flow separator; 62. Lower flow separator; 63. Mounting portion; 64. Mounting groove; 65. Flow guide portion. DETAILED DESCRIPTION

[0038] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention is now described in detail in conjunction with the accompanying drawings. This figure is a simplified schematic diagram, which only illustrates the basics of the present invention in an illustrative manner, so it only shows the composition related to the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of 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.

[0039] Please refer to Figure 1-3 , comprising a base 1, a heat exchanger 2 installed on the top of the base 1, an inlet and outlet pipe 3 opened on the heat exchanger 2, a heat exchange tube bundle 4, a baffle 5 and a flow partition 6 arranged inside the heat exchanger 2. The fluid that needs to exchange heat in the phthalic anhydride production process can enter the heat exchanger 2 from the inlet and outlet pipe 3, complete the heat exchange in the process of flowing between the heat exchange tube bundle 4, the baffle 5 and the flow partition 6, and finally be discharged from the inlet and outlet pipe 3.

[0040] Please refer to Figure 1 The base 1 is set as a frame structure, and the base 1 is set horizontally. A heat exchanger 2 is installed on the top of the base 1, and the base 1 can ensure that the heat exchanger 2 is installed stably and reliably. A maintenance ladder 11 is installed on the top of the base 1 away from the heat exchanger 2, and the staff can perform regular maintenance on the heat exchanger 2 through the maintenance ladder 11.

[0041] Please refer to Figure 1-3The heat exchanger 2 includes a horizontally arranged heat exchange sleeve 21, and the heat exchange sleeve 21 is arranged as a hollow cylindrical structure. A support seat 24 is arranged at the bottom of the heat exchange sleeve 21, and the support seat 24 is in contact with the side wall of the heat exchange sleeve 21. The support seat 24 is installed on the top of the base 1, and the installation and fixation of the heat exchange sleeve 21 is realized by the support seat 24. The inside of the heat exchange sleeve 21 is sequentially provided with a first heat exchange chamber 211, a second heat exchange chamber 212 and a third heat exchange chamber 213, and the fluid can flow into the first heat exchange chamber 211, the second heat exchange chamber 212 and the third heat exchange chamber 213 for heat exchange. A group of plugging plates 22 are respectively arranged at both ends of the second heat exchange chamber 212, and the second heat exchange chamber 212 is separated from the first heat exchange chamber 211 and the third heat exchange chamber 213 by the plugging plates 22. An inspection door 23 is provided on one side of the heat exchange sleeve 21. The inspection door 23 is provided on the side of the heat exchange sleeve 21 close to the first heat exchange chamber 211. The inspection door 23 can be opened to inspect the first heat exchange chamber 211. Multiple groups of heat exchange tube bundles 4 are provided along the length direction of the heat exchange sleeve 21, and each group of heat exchange tube bundles 4 is penetrated by the plugging plate 22. In the process of phthalic anhydride production, two fluids that need to exchange heat are divided into the inside and the outer wall of the heat exchange tube bundle 4, and heat is transferred and exchanged through the heat exchange tube bundle 4 to complete the heat exchange. The plugging plate 22 is provided with a tube bundle through hole 221 whose shape is adapted to the shape of the heat exchange tube bundle 4. The two ends of the heat exchange tube bundle 4 are respectively penetrated by the tube bundle through holes 221 on the two groups of plugging plates 22. The plugging plate 22 and the heat exchange tube bundle 4 are connected by welding, and the multiple groups of heat exchange tube bundles 4 can be limited by the plugging plate 22.

[0042] Please refer to Figure 1-3 The inlet and outlet pipe 3 includes a first inlet 31, a second inlet 32, a first outlet 33 and a second outlet 34 which are provided on the heat exchange sleeve 21. The first inlet 31, the second inlet 32, the first outlet 33 and the second outlet 34 are all provided as circular tube structures. The first inlet 31 and the first outlet 33 are both provided at the top of the heat exchange sleeve 21 and are respectively connected to the inside of the first heat exchange chamber 211. The first inlet 31 and the first outlet 33 are symmetrically provided along the axis of the length direction of the heat exchange sleeve 21. During the production process of phthalic anhydride, the first fluid which needs to be heat exchanged can enter the inside of the first heat exchange chamber 211 through the first inlet 31, and then pass through the plug plate 22 to continue to enter the inside of the heat exchange tube bundle 4 for circulation, and can be discharged from the first outlet 33 after the circulation is completed. The second inlet 32 ​​is provided at the top of the heat exchange sleeve 21, and the second outlet 34 is provided at the bottom of the heat exchange sleeve 21. The second inlet 32 ​​and the second outlet 34 are respectively connected to the inside of the second heat exchange chamber 212. During the phthalic anhydride production process, the second fluid that needs to be heat exchanged can enter the second heat exchange chamber 212 through the second inlet 32, contact the outer wall of the heat exchange tube bundle 4 to complete the heat exchange, and then be discharged from the second outlet 34 after the heat exchange is completed. In this process, the two fluids that need to be heat exchanged can transfer heat through the heat exchange tube bundle 4 to complete the heat transfer between different fluids.

[0043] Please refer to Figure 2-6 The baffle 5 includes an upper baffle 51 and a lower baffle 52 symmetrically arranged inside the second heat exchange chamber 212. The upper baffle 51 and the lower baffle 52 are arranged at intervals along the length direction of the second heat exchange chamber 212, and the spacing between each two groups of upper baffles 51 and lower baffles 52 is consistent. The upper baffles 51 and the lower baffles 52 have the same structure and are both arranged as disc structures. The upper baffles 51 and the lower baffles 52 are both arranged in the vertical direction. An arc portion 53 is arranged at one end of each group of upper baffles 51 and a horizontal portion 54 is arranged at the other end. The upper baffles 51 and the lower baffles 52 are symmetrically arranged about the horizontal axis. That is, the arc portion 53 on the upper baffle 51 is arranged at the top of the horizontal portion 54, and the horizontal portion 54 on the lower baffle 52 is arranged at the top of the arc portion 53. The installation height of the horizontal portion 54 on the lower baffle 52 is lower than the height of the arc portion 53 on the upper baffle 51. Each group of upper baffles 51 and lower baffles 52 is provided with baffle holes 55, and the shape of the baffle holes 55 matches the shape of the heat exchange tube bundle 4. The baffle holes 55 are arranged in several groups, which can fix the heat exchange tube bundle 4 on the one hand, and can also allow the fluid that needs heat exchange to pass through, so that the fluid flows inside the second heat exchange cavity 212, which is convenient for heat exchange. The heat exchange tube bundle 4 is provided with baffle holes 55, and the heat exchange tube bundle 4 is connected to the upper baffles 51 and the lower baffles 52 by welding, so as to ensure that the connection between the heat exchange tube bundle 4 and the upper baffles 51 and the lower baffles 52 is reliable.

[0044] Please refer to Figure 2-5 and Figure 7-8A group of flow dividers 6 is disposed between each two groups of upper baffles 51 and lower baffles 52, and the flow dividers 6 include an upper flow divider 61 and a lower flow divider 62 symmetrically disposed inside the second heat exchange chamber 212. The upper flow divider 61 and the lower flow divider 62 are disposed in the horizontal direction, and the upper flow divider 61 and the lower flow divider 62 are disposed at intervals along the length direction of the second heat exchange chamber 212. The upper baffles 51 and the lower baffles 52 are disposed symmetrically about the horizontal axis, and the upper flow divider 61 is disposed on the top of the lower flow divider 62, and the height difference between each two groups of upper flow dividers 61 and lower flow dividers 62 is consistent. The upper flow dividers 61 and the lower flow dividers 62 have the same structure, and each group of upper flow dividers 61 and lower flow dividers 62 includes a mounting portion 63 disposed on both sides and a flow guide portion 65 disposed in the middle. The mounting portion 63 and the flow guide portion 65 are integrally formed to form the overall structure of the upper flow divider 61 and the lower flow divider 62. The mounting portion 63 is arranged horizontally, and a guide portion 65 is connected between two groups of mounting portions 63. The guide portion 65 is arranged as a wavy plate-like structure. Mounting grooves 64 are provided on the mounting portion 63 at positions corresponding to the positions of the upper baffle 51 and the lower baffle 52, and the shapes of the mounting grooves 64 are adapted to the shapes of the upper baffle 51 and the lower baffle 52. The upper baffle 51 and the lower baffle 52 are respectively inserted into the mounting grooves 64 on the upper baffle 61 and the lower baffle 62, and are connected to the upper baffle 61 and the lower baffle 62 by welding, and the upper baffle 51 and the lower baffle 52 are connected to the upper baffle 61 and the lower baffle 62 by the mounting grooves 64 on the mounting portion 63.

[0045] Specifically, during the phthalic anhydride production process, after the fluid that needs to exchange heat enters the second heat exchange chamber 212 from the second inlet 32, it first passes through the baffle holes 55 on the upper baffle 51, and then passes through the baffle holes 55 on the lower baffle 52, so as to flow between different upper baffles 51 and lower baffles 52. During the flow of the fluid between the upper baffle 51 and the lower baffle 52, the fluid can also be guided by the wave-shaped structure of the guide part 65 through contact with the guide parts 65 on the upper baffle 61 and the lower baffle 62 that are spaced apart from each other, thereby reducing the flow speed of the fluid in the second heat exchange chamber 212 to a certain extent, effectively eliminating the fluid-induced vibration, further reducing the probability of vibration of the heat exchange tube bundle 4 due to the excessively fast fluid flow rate, and finally reducing the probability of leakage of the heat exchange tube bundle 4.

[0046] On the other hand, by arranging two layers of upper flow partitions 61 and lower flow partitions 62 between the upper baffle 51 and the lower baffle 52, not only the connection strength between the upper baffle 51 and the lower baffle 52 can be strengthened, but also support can be added to the heat exchange tube bundle 4 from the longitudinal direction, thereby increasing the natural frequency of the heat exchange tube bundle 4, making the fluid induced vibration frequency away from the natural frequency of the heat exchange tube bundle 4, reducing the probability of resonance between the heat exchange tube bundle 4 and the fluid, and preventing the heat exchange tube bundle 4 from leaking due to resonance, thereby affecting the normal production of phthalic anhydride.

[0047] The structures of the upper flow partition 61 and the lower flow partition 62 can also form longitudinal detuning partitions in the flow direction of the heat exchange tube bundle 4, thereby increasing the standing wave frequency and preventing acoustic resonance between the heat exchange tube bundle 4 and the fluid, thereby achieving the purpose of reducing the resonance probability of the heat exchange tube bundle 4.

[0048] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, it can be a mechanical connection, it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] It should be understood that the orientation or position relationship indicated by terms such as "length", "width", "up", "down", "front and back", "left and right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0050] The above is based on the ideal embodiment of the present invention. Through the above description, relevant personnel can make various changes and modifications without departing from the scope of the present invention. The technical scope of this invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A heat exchange device for phthalic anhydride production, characterized in that: The invention comprises a heat exchanger (2), an inlet and outlet pipe (3) provided on the heat exchanger (2), a heat exchange tube bundle (4) arranged inside the heat exchanger (2), a baffle (5) and a flow divider (6); the heat exchanger (2) comprises a horizontally arranged heat exchange sleeve (21); a first heat exchange cavity (211), a second heat exchange cavity (212) and a third heat exchange cavity (213) are arranged in sequence inside the heat exchange sleeve (21); the baffle (5) comprises an upper baffle (51) and a lower baffle (52) symmetrically arranged inside the second heat exchange cavity (212); and the flow divider (6) comprises an upper flow divider (61) and a lower flow divider (62) symmetrically arranged inside the second heat exchange cavity (212).

2. A heat exchange device for phthalic anhydride production according to claim 1, characterized in that: The upper baffle plates (51) and the lower baffle plates (52) are arranged at intervals along the length direction of the second heat exchange chamber (212); the upper baffle plates (51) and the lower baffle plates (52) are arranged symmetrically about the horizontal axis; and a group of flow partition plates (6) is arranged between each two groups of upper baffle plates (51) and lower baffle plates (52).

3. A heat exchange device for phthalic anhydride production according to claim 2, characterized in that: The upper baffle plates (51) and the lower baffle plates (52) have the same structure and are both arranged as disc structures. One end of each group of the upper baffle plates (51) is provided with an arc portion (53) and the other end is provided with a horizontal portion (54). Each group of the upper baffle plates (51) and the lower baffle plates (52) are provided with baffle flow holes (55) extending therethrough.

4. A heat exchange device for phthalic anhydride production according to claim 1, characterized in that: The upper flow divider (61) and the lower flow divider (62) are arranged at intervals along the length direction of the second heat exchange chamber (212), the upper baffle plate (51) and the lower baffle plate (52) are arranged symmetrically about the horizontal axis, and the upper flow divider (61) is arranged on the top of the lower flow divider (62).

5. A heat exchange device for phthalic anhydride production according to claim 4, characterized in that: The upper flow divider (61) and the lower flow divider (62) have the same structure, and each set of the upper flow divider (61) and the lower flow divider (62) comprises mounting portions (63) arranged on both sides and a flow guide portion (65) arranged in the middle.

6. A heat exchange device for phthalic anhydride production according to claim 5, characterized in that: The mounting portion (63) is provided with mounting grooves (64) at positions corresponding to the upper baffle plate (51) and the lower baffle plate (52), and the shape of the mounting grooves (64) is adapted to the shape of the upper baffle plate (51) and the lower baffle plate (52).

7. A heat exchange device for phthalic anhydride production according to claim 1, characterized in that: A group of plugging plates (22) are respectively provided at both ends of the second heat exchange cavity (212), and the plugging plates (22) are provided with tube bundle through holes (221) whose shapes match the shapes of the heat exchange tube bundle (4).

8. A heat exchange device for phthalic anhydride production according to claim 7, characterized in that: A support seat (24) is provided at the bottom of the heat exchange sleeve (21), and an inspection door (23) is provided on one side of the heat exchange sleeve (21).

9. A heat exchange device for phthalic anhydride production according to claim 8, characterized in that: The inlet and outlet pipe (3) comprises a first inlet (31), a second inlet (32), a first outlet (33) and a second outlet (34) which are provided on the heat exchange sleeve (21); the first inlet (31) and the first outlet (33) are both provided at the top of the heat exchange sleeve (21) and are respectively connected to the interior of the first heat exchange chamber (211).

10. A heat exchange device for phthalic anhydride production according to claim 9, characterized in that: The second inlet (32) is arranged at the top of the heat exchange sleeve (21), and the second outlet (34) is arranged at the bottom of the heat exchange sleeve (21). The second inlet (32) and the second outlet (34) are respectively connected to the interior of the second heat exchange chamber (212).

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