Leak-proof heat exchanger for phthalic anhydride device

Abstract

The utility model is applicable to the technical field of heat exchange of phthalic anhydride devices, and provides a leakproof heat exchanger for a phthalic anhydride device, which comprises a heat exchange cylinder, a water inlet and outlet component and a pressure relief component arranged on the heat exchange cylinder, and a heat exchange tube arranged in the heat exchange cylinder, the pressure relief assembly comprises a connecting pipe connected with the heat exchange cylinder, a pressure relief pipe arranged at the top of the connecting pipe, a pressure relief disc arranged in the connecting pipe and a lifting disc arranged in the pressure relief pipe. The device solves the problem that mechanical stress generated by overpressure in the heat exchanger acts on the heat exchange tube, so that the heat exchange tube leaks, and the phthalic anhydride production quality and safety are affected, and the effects that the pressure relief disc is automatically opened through air pressure, and the air pressure in the heat exchanger is automatically adjusted through the formed pressure relief channel are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchange of phthalic anhydride devices, and more specifically, to a leakage-proof heat exchanger for phthalic anhydride devices. Background Art

[0002] Phthalic anhydride, also known as phthalic anhydride, is an important organic chemical raw material with a wide range of applications, including chemicals, plastics, rubber, textiles, pharmaceuticals, and electronics. Heat exchangers are required in each process step of phthalic anhydride production, including heating, cooling, condensation, evaporation, and reboiling, to meet the diverse physical and chemical reaction conditions required during production.

[0003] During heat exchanger operation, overpressure can occur due to factors such as energy input indirectly increasing the heat exchanger pressure through vaporization or thermal expansion, as well as direct inflow of higher pressure. Prolonged operation of a heat exchanger in an overpressure state gradually applies mechanical stress to the heat exchange tubes. This increased mechanical stress further increases the probability of leaks.

[0004] During the phthalic anhydride manufacturing process, heat exchange tube leaks not only cause mixing of the tube-side and shell-side media, impacting product quality, but can also cause maleic anhydride and phthalic anhydride in the heat exchanger to react with leaked water to produce maleic acid and phthalic acid, which then react with iron oxide to form iron maleate and iron phthalate, both of which have lower autoignition points, increasing the risk of combustion. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a leakage-proof heat exchanger for a phthalic anhydride device that can use air pressure to open a pressure relief channel to automatically adjust the air pressure inside the heat exchanger.

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

[0007] A leakage-proof heat exchanger for a phthalic anhydride device includes a heat exchange tube, a water inlet and outlet assembly and a pressure relief assembly opened on the heat exchange tube, and a heat exchange pipe arranged inside the heat exchange tube. The pressure relief assembly includes a connecting pipe connected to the heat exchange tube, a pressure relief pipe arranged on the top of the connecting pipe, a pressure relief disk arranged inside the connecting pipe, and a lifting disk arranged inside the pressure relief pipe.

[0008] The utility model is further configured as follows: the connecting pipe is configured as a circular pipe structure, the pressure relief pipe is configured as a conical pipe structure, a plurality of lifting screws are arranged around the lifting plate, and each group of lifting screws passes through the lifting plate and is inserted downward into the connecting pipe.

[0009] The utility model is further configured as follows: the lifting plate is configured as a disc structure with a diameter that matches the diameter of the top of the pressure relief pipe, and the pressure relief plate is configured as a disc structure with a diameter that matches the inner diameter of the connecting pipe.

[0010] The utility model is further configured as follows: a plurality of groups of connecting slide rods are connected between the lifting plate and the pressure relief plate, the plurality of groups of connecting slide rods are arranged around the circumference of the lifting plate, and each group of connecting slide rods can be extended and retracted in the vertical direction.

[0011] The utility model is further configured as follows: a group of lifting springs are provided on the outer side wall of each group of connecting slide rods, the top of each group of lifting springs is connected to the bottom of the lifting plate, and the bottom is connected to the top of the pressure relief plate.

[0012] By adopting this technical solution, when the internal pressure of the heat exchange tube exceeds a predetermined value, the gas pressure generated by the gas in the second heat exchange chamber applies pressure to the pressure relief disc, causing it to move upward. This upward movement of the pressure relief disc also drives the lifting disc upward. This upward movement of the lifting disc also drives the lifting screw upward vertically within the connecting tube, thereby separating the pressure relief tube from the connecting tube.

[0013] The present invention is further configured as follows: the heat exchange tube is configured as a hollow structure, and a first heat exchange chamber, a second heat exchange chamber and a third heat exchange chamber are sequentially arranged inside the heat exchange tube.

[0014] The present invention is further configured as follows: the water inlet and outlet components include a first water inlet pipe, a first water outlet pipe, a second water inlet pipe and a second water outlet pipe opened on the side wall of the heat exchange cylinder; the first water inlet pipe and the first water outlet pipe are both connected to the interior of the first heat exchange chamber, and the second water inlet pipe and the second water outlet pipe are both connected to the interior of the second heat exchange chamber.

[0015] The present invention is further configured as follows: the first water inlet pipe is opened at the top of the first heat exchange chamber, and the first water outlet pipe is opened at the bottom of the first heat exchange chamber; the second water inlet pipe is opened at the top of the second heat exchange chamber close to one side of the first heat exchange chamber, and the second water outlet pipe is opened at the bottom of the second heat exchange chamber close to one side of the third heat exchange chamber.

[0016] The present invention is further configured as follows: multiple groups of heat exchange tubes are arranged along the length direction of the heat exchange tube, each group of heat exchange tubes includes a water inlet portion arranged inside the second heat exchange bin and a bent pipe portion arranged inside the third heat exchange bin, the water inlet portion is arranged horizontally, and the water inlet portion is connected to the bent pipe portion.

[0017] The utility model is further configured as follows: a plurality of groups of baffles are provided on the outer side wall of the water inlet portion, the baffles are arranged in a vertical direction, and two groups of baffles are arranged equidistantly.

[0018] The beneficial effects of the utility model are:

[0019] 1. By configuring a pressure relief disc, a lifting disc, and a lifting screw, the pressure relief disc simultaneously drives the lifting disc and the lifting screw to move when air pressure acts on the disc, separating the pressure relief pipe from the connecting pipe and forming a pressure relief channel. Excess gas is discharged from the pressure relief channel, automatically adjusting the pressure inside the heat exchanger tube. This prevents leakage caused by mechanical stress generated by overpressure in the heat exchanger tube, which could affect the quality and safety of phthalic anhydride production. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Figure 1 This is a schematic structural diagram of a leakage-proof heat exchanger for a phthalic anhydride device according to the present invention.

[0022] Figure 2 for Figure 1 A front view of a leak-proof heat exchanger for a phthalic anhydride unit is shown.

[0023] Figure 3 for Figure 1 A cross-sectional view of a leak-proof heat exchanger for a phthalic anhydride unit is shown.

[0024] Figure 4 for Figure 1 Schematic diagram of the structure of the pressure relief component shown.

[0025] Figure 5 for Figure 4 A cross-sectional view of the pressure relief assembly is shown.

[0026] Figure 6 for Figure 4 A cross-sectional view of the pressure relief assembly in another state is shown.

[0027] Description of reference numerals: 1, heat exchange cylinder; 11, first heat exchange chamber; 12, second heat exchange chamber; 13, third heat exchange chamber;

[0028] 2. Water inlet and outlet assembly; 21. First water inlet pipe; 22. First water outlet pipe; 23. Second water inlet pipe; 24. Second water outlet pipe;

[0029] 3. Heat exchange tube; 31. Water inlet; 32. Bend; 33. Baffle;

[0030] 4. Pressure relief assembly; 41. Connecting pipe; 42. Pressure relief pipe; 43. Pressure relief disc; 44. Lifting screw; 45. Lifting spring; 46. Connecting slide rod; 47. Lifting disc. DETAILED DESCRIPTION

[0031] 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 with reference to the accompanying drawings. This figure is a simplified schematic diagram, which only illustrates the basics of the present invention in an illustrative manner, and therefore only shows the structures related to the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in 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.

[0032] Please refer to Figure 1-3 A leak-proof heat exchanger for a phthalic anhydride production plant comprises a heat exchanger tube 1, a water inlet and outlet assembly 2 and a pressure relief assembly 4 provided on the heat exchanger tube 1, and a heat exchange tube 3 disposed within the heat exchanger tube 1. During the phthalic anhydride production process, fluid to be exchanged enters the heat exchanger tube 1 and the heat exchange tube 3 through the water inlet and outlet assembly 2 and is discharged from the water inlet and outlet assembly 2 after heat exchange is complete. If overpressure occurs during the heat exchange process, the pressure relief assembly 4 automatically opens to discharge gas, preventing leakage in the heat exchange tube 3 caused by the overpressure.

[0033] Please refer to Figure 1-3 The heat exchange tube 1 is arranged horizontally and is a cylindrical structure with a support at the bottom. The heat exchange tube 1 is a hollow structure, and a first heat exchange chamber 11, a second heat exchange chamber 12, and a third heat exchange chamber 13 are sequentially arranged inside the heat exchange tube 1. The first heat exchange chamber 11 and the second heat exchange chamber 12 are connected by a heat exchange pipe 3, and the second heat exchange chamber 12 and the third heat exchange chamber 13 are connected to each other.

[0034] Please refer to Figure 1-3The water inlet and outlet assembly 2 includes a first water inlet pipe 21, a first water outlet pipe 22, a second water inlet pipe 23, and a second water outlet pipe 24, which are opened on the side wall of the heat exchange tube 1. The first water inlet pipe 21, the first water outlet pipe 22, the second water inlet pipe 23, and the second water outlet pipe 24 are all configured as hollow cylindrical structures. The first water inlet pipe 21 is opened at the top of the first heat exchange chamber 11, and the first water outlet pipe 22 is opened at the bottom of the first heat exchange chamber 11. The first water inlet pipe 21 and the first water outlet pipe 22 are both connected to the interior of the first heat exchange chamber 11. The first fluid that needs to be heat exchanged can enter the first heat exchange chamber 11 from the first water inlet pipe 21, and then enter the heat exchange tube 3 through the first heat exchange chamber 11. After completing the circulation inside the heat exchange tube 3, it returns to the first heat exchange chamber 11 and is discharged from the first water outlet pipe 22. The second water inlet pipe 23 is located at the top of the second heat exchange chamber 12, near the first heat exchange chamber 11. The second water outlet pipe 24 is located at the bottom of the second heat exchange chamber 12, near the third heat exchange chamber 13. Both the second water inlet pipe 23 and the second water outlet pipe 24 are connected to the interior of the second heat exchange chamber 12. The first fluid to be heat exchanged can enter the second heat exchange chamber 12 through the second water inlet pipe 23. During the flow between the second heat exchange chamber 12 and the third heat exchange chamber 13, it contacts the heat exchange tube 3 to complete the heat exchange. After the heat exchange is completed, the fluid is discharged from the first water outlet pipe 22 at the bottom of the second heat exchange chamber 12.

[0035] Please refer to Figure 3 There are multiple groups of heat exchange tubes 3 along the length of the heat exchange cylinder 1. Each group of heat exchange tubes 3 includes a water inlet 31 arranged inside the second heat exchange chamber 12 and a bend 32 arranged inside the third heat exchange chamber 13. The water inlet 31 is arranged horizontally, with one end of the water inlet 31 connected to the interior of the first heat exchange chamber 11 and the other end connected to the bend 32. A U-shaped structure is formed between the water inlet 31 and the bend 32, which facilitates the fluid that needs to exchange heat to flow from the water inlet 31 to the bend 32 and then return to the water inlet 31 to complete the cycle. There are multiple groups of baffles 33 on the outer wall of the water inlet 31, and the baffles 33 are connected to the water inlet 31 by welding. The baffles 33 are arranged in the vertical direction, and the two groups of baffles 33 are arranged equidistantly. During the flow of the fluid entering the second heat exchange chamber 12, it can form an up and down vortex through the action of the baffles 33, thereby increasing the contact with the heat exchange tube 3 and ensuring sufficient heat exchange.

[0036] Please refer to Figure 4-6The pressure relief assembly 4 includes a connecting pipe 41 connected to the heat exchange tube 1, a pressure relief pipe 42 arranged at the top of the connecting pipe 41, a pressure relief disc 43 arranged inside the connecting pipe 41, and a lifting disc 47 arranged inside the pressure relief pipe 42. The connecting pipe 41 is configured as a circular pipe structure, and the interior of the connecting pipe 41 is connected to the interior of the second heat exchange chamber 12. The pressure relief pipe 42 is configured as a conical pipe structure, the top diameter of the pressure relief pipe 42 is smaller than the bottom diameter, and the top diameter of the pressure relief pipe 42 is adapted to the diameter of the connecting pipe 41. The lifting disc 47 is configured as a disc structure with a diameter adapted to the top diameter of the pressure relief pipe 42, and the lifting disc 47 is connected to the top of the pressure relief pipe 42. The pressure relief disc 43 is configured as a disc structure with a diameter adapted to the inner diameter of the connecting pipe 41, and the pressure relief disc 43 is placed on the connecting pipe 41. A plurality of connecting slide rods 46 are connected between the lifting disc 47 and the pressure relief disc 43, and the plurality of connecting slide rods 46 are arranged in a circumferential direction around the lifting disc 47. Each set of connecting slide rods 46 is composed of two sliding rods plugged into each other, and each set of connecting slide rods 46 can be extended and retracted in the vertical direction. A set of lifting springs 45 are provided on the outer wall of each set of connecting slide rods 46. The top of each set of lifting springs 45 is connected to the bottom of the lifting plate 47, and the bottom is connected to the top of the pressure relief plate 43. During the movement of the pressure relief plate 43 relative to the lifting plate 47, the lifting springs 45 can provide buffering. There are multiple sets of lifting screws 44 arranged around the lifting plate 47, and through holes corresponding to the positions of the lifting screws 44 are provided on the connecting pipe 41, which are adapted to the shape of the lifting screws 44. Each set of lifting screws 44 passes through the lifting plate 47 and is plugged downward into the inside of the connecting pipe 41. The lifting screws 44 can move vertically inside the connecting pipe 41.

[0037] Specifically, when the internal pressure value of the heat exchange tube 1 exceeds the predetermined pressure value, the air pressure generated by the gas inside the second heat exchange chamber 12 applies pressure to the pressure relief disc 43, causing the pressure relief disc 43 to move upward. During the upward movement of the pressure relief disc 43, it can synchronously drive the lifting disc 47 to move upward. During the upward movement of the lifting disc 47, it synchronously drives the lifting screw 44 to move upward in the vertical direction inside the connecting pipe 41, thereby separating the pressure relief pipe 42 relative to the connecting pipe 41. At this time, a pressure relief channel is formed between the pressure relief disc 43 and the connecting pipe 41, which facilitates the discharge of gas, thereby regulating the internal air pressure of the heat exchange tube 1. When the internal air pressure of the heat exchange tube 1 returns to normal, the pressure relief disc 43 falls back to the top of the connecting pipe 41 under the action of gravity, completing the sealing of the pressure relief channel. The lifting spring 45 and the connecting slide rod 46 can provide a buffer for the movement of the pressure relief disc 43 and the lifting disc 47, and assist the pressure relief disc 43 and the lifting disc 47 in moving.

[0038] By providing a pressure relief disc 43, a lifting disc 47, and a lifting screw 44, when air pressure acts on the pressure relief disc 43, the disc 43 simultaneously drives the lifting disc 47 and the lifting screw 44 to move, separating the pressure relief pipe 42 from the connecting pipe 41 and forming a pressure relief passage. Excess gas is discharged from the pressure relief passage, automatically adjusting the pressure within the heat exchange tube 1 and preventing leakage in the heat exchange tube 3 due to mechanical stress caused by overpressure, which could affect the quality and safety of phthalic anhydride production.

[0039] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections; they may refer to direct connections or indirect connections through an intermediate medium; they may refer to internal communication between two components or an interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0040] It should be understood that the terms "length", "width", "up", "down", "front and back", "left and right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying 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 operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0041] The above description is based on the ideal embodiment of the present invention. Based on 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 utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A leak-proof heat exchanger for a phthalic anhydride device, characterized in that: The invention comprises a heat exchange tube (1), a water inlet and outlet assembly (2) and a pressure relief assembly (4) provided on the heat exchange tube (1), and a heat exchange pipe (3) arranged inside the heat exchange tube (1); the pressure relief assembly (4) comprises a connecting tube (41) connected to the heat exchange tube (1), a pressure relief pipe (42) arranged at the top of the connecting tube (41), a pressure relief disc (43) arranged inside the connecting tube (41), and a lifting disc (47) arranged inside the pressure relief pipe (42).

2. The anti-leakage heat exchanger for a phthalic anhydride device according to claim 1, characterized in that: The connecting pipe (41) is configured as a circular pipe structure, the pressure relief pipe (42) is configured as a conical pipe structure, and a plurality of lifting screw rods (44) are arranged around the lifting plate (47). Each group of lifting screw rods (44) passes through the lifting plate (47) and is inserted downward into the connecting pipe (41).

3. The anti-leakage heat exchanger for a phthalic anhydride device according to claim 2, characterized in that: The lifting disc (47) is configured as a disc structure having a diameter that matches the top diameter of the pressure relief pipe (42), and the pressure relief disc (43) is configured as a disc structure having a diameter that matches the inner diameter of the connecting pipe (41).

4. The anti-leakage heat exchanger for a phthalic anhydride device according to claim 3, characterized in that: A plurality of connecting slide bars (46) are connected between the lifting plate (47) and the pressure relief plate (43). The plurality of connecting slide bars (46) are arranged in a circumferential direction around the lifting plate (47). Each group of connecting slide bars (46) can be extended and retracted in a vertical direction.

5. The anti-leakage heat exchanger for a phthalic anhydride device according to claim 4, characterized in that: A group of lifting springs (45) is provided on the outer side wall of each group of connecting slide bars (46), and the top of each group of lifting springs (45) is connected to the bottom of the lifting plate (47), and the bottom is connected to the top of the pressure relief plate (43).

6. The anti-leakage heat exchanger for a phthalic anhydride device according to claim 5, characterized in that: The heat exchange tube (1) is configured as a hollow structure, and a first heat exchange chamber (11), a second heat exchange chamber (12), and a third heat exchange chamber (13) are sequentially arranged inside the heat exchange tube (1).

7. The anti-leakage heat exchanger for a phthalic anhydride device according to claim 6, characterized in that: The water inlet and outlet assembly (2) comprises a first water inlet pipe (21), a first water outlet pipe (22), a second water inlet pipe (23) and a second water outlet pipe (24) which are arranged on the side wall of the heat exchange cylinder (1); the first water inlet pipe (21) and the first water outlet pipe (22) are both in communication with the interior of the first heat exchange chamber (11); and the second water inlet pipe (23) and the second water outlet pipe (24) are both in communication with the interior of the second heat exchange chamber (12).

8. The leakage-proof heat exchanger for a phthalic anhydride device according to claim 7, characterized in that: The first water inlet pipe (21) is opened at the top of the first heat exchange chamber (11), and the first water outlet pipe (22) is opened at the bottom of the first heat exchange chamber (11); the second water inlet pipe (23) is opened at the top of the second heat exchange chamber (12) close to the side of the first heat exchange chamber (11), and the second water outlet pipe (24) is opened at the bottom of the second heat exchange chamber (12) close to the side of the third heat exchange chamber (13).

9. The anti-leakage heat exchanger for a phthalic anhydride device according to claim 6, characterized in that: The heat exchange tubes (3) are arranged in multiple groups along the length direction of the heat exchange cylinder (1), and each group of the heat exchange tubes (3) includes a water inlet (31) arranged inside the second heat exchange chamber (12) and a curved pipe portion (32) arranged inside the third heat exchange chamber (13). The water inlet (31) is arranged horizontally, and the water inlet (31) is connected to the curved pipe portion (32).

10. The anti-leakage heat exchanger for a phthalic anhydride device according to claim 9, characterized in that: The outer side wall of the water inlet portion (31) is provided with multiple groups of baffles (33), the baffles (33) are arranged in a vertical direction, and two groups of baffles (33) are arranged at equal distances.

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