Inlet connection structure and reactor

Abstract

The utility model relates to an import pipe connection structure and reactor, relate to chemical equipment technical field. The utility model discloses an import pipe connection structure includes the main pipe, branch and strengthens the component, branch sets up on the outer wall of main pipe and with main pipe intercommunication, strengthens the component to set up on the outer wall of main pipe, wherein, branch is worn in strengthens the component and with strengthen the component is linked, branch respectively with main pipe, strengthen the component jointly forms the strengthening cavity, and the strengthening cavity surrounds branch. The utility model discloses the technical scheme can reduce the temperature difference of branch and main pipe junction on import pipe connection, reduce the stress of branch and main pipe junction, thereby effectively avoid the crack of import pipe connection.

Description

Technical Field

[0001] This utility model relates to the field of chemical equipment technology, and in particular to an inlet pipe structure and reactor. Background Technology

[0002] A reactor is a device used to realize a reaction process and is widely used in chemical, oil refining, and metallurgical fields. The propane dehydrogenation to propylene reactor is a key piece of equipment in the production of propylene. When propane feedstock flows through the catalyst bed in the reactor at high temperature, it is catalytically cracked into propylene and hydrogen. This reaction is strongly endothermic, and heat loss from the reactor must be strictly controlled during the reaction process.

[0003] In some cases, the inlet nozzles of propane dehydrogenation to propylene reactors employ a cactus-shaped or forked composite inlet structure, including a main air pipe and hydrocarbon branch pipes, steam branch pipes, and reducing gas branch pipes welded to the main air pipe. The local stress at the connection points between the hydrocarbon branch pipes, steam branch pipes, and the main air pipe is excessive. Therefore, the cactus-shaped or forked composite inlet structure is typically reinforced with thick-walled pipes and reinforcing ribs. However, after the reactor has been running for a certain period, cracks may still appear at the welds of the composite inlet structure. These cracks must be repaired by welding under vacuum conditions before the reactor can continue operating. Utility Model Content

[0004] This utility model provides an inlet pipe structure and reactor, which can reduce the temperature difference at the connection between the branch pipe and the main pipe on the inlet pipe, reduce the stress at the connection between the branch pipe and the main pipe, and thus effectively prevent cracks from forming on the inlet pipe.

[0005] In a first aspect, embodiments of this utility model provide an inlet pipe structure, comprising:

[0006] director;

[0007] A branch pipe, disposed on the outer wall of the main pipe and connected to the main pipe; and

[0008] A reinforcing component is disposed on the outer wall of the main tube;

[0009] The branch pipe passes through and is connected to the reinforcing component. The branch pipe, the main pipe, and the reinforcing component together form a reinforcing cavity, and the reinforcing cavity surrounds the branch pipe.

[0010] In one embodiment, the reinforcement component includes:

[0011] The first reinforcing ring is disposed on the outer wall of the main tube;

[0012] A second reinforcing ring is disposed on the outer wall of the main pipe, and the second reinforcing ring and the first reinforcing ring are arranged axially spaced apart along the main pipe, with each branch pipe located between the first reinforcing ring and the second reinforcing ring; and

[0013] A reinforcing cover is provided on the outer wall of the main pipe and is connected to the first reinforcing ring and the second reinforcing ring respectively. The reinforcing cover corresponds to the branch pipe one by one.

[0014] The branch pipe is inserted into and connected to the corresponding reinforced cover.

[0015] In one embodiment, the reinforced cover includes:

[0016] Two reinforcing ribs are connected to the outer wall of the main pipe and arranged at intervals along the circumference of the main pipe. The two ends of each reinforcing rib are connected to the first reinforcing ring and the second reinforcing ring, respectively, and the corresponding branch pipe is located between the two reinforcing ribs.

[0017] A reinforcing cover plate is connected to the first reinforcing ring, the second reinforcing ring, and the two reinforcing ribs, respectively, wherein the corresponding branch pipe passes through the reinforcing cover plate and is connected to the reinforcing cover plate.

[0018] In one embodiment, the reinforcing cover is provided with leak detection holes at the top and / or bottom.

[0019] In one embodiment, the reinforcing cover plate is arc-shaped.

[0020] In one embodiment, the branch pipe is a straight pipe or a tapered pipe, and the main pipe is a straight pipe or a tapered pipe; wherein, the branch pipe and the main pipe have an angle between them, and the angle is less than 90°.

[0021] In one embodiment, the diameter of the main pipe is larger than the diameter of the branch pipe.

[0022] In one embodiment, the first reinforcing ring and the second reinforcing ring have a first preset distance, wherein the first preset distance is twice the diameter of the branch pipe.

[0023] In one embodiment, the two reinforcing ribs of the reinforcing cover have a second preset distance between them, wherein the second preset distance is twice the diameter of the branch pipe corresponding to the reinforcing cover.

[0024] Secondly, this utility model provides a reactor, including the inlet pipe structure as described above.

[0025] Compared with the prior art, the advantages of this utility model embodiment are as follows: by setting up a reinforcing component, the reinforcing component, together with the main pipe and branch pipe, forms a reinforcing cavity, and the reinforcing cavity surrounds the branch pipe, forming a cavity outside the branch pipe to reduce heat dissipation. The connection between the branch pipe and the main pipe is located inside the reinforcing cavity, thereby reducing the temperature difference and stress at the connection between the branch pipe and the main pipe. This not only effectively prevents cracks from forming on the inlet pipe structure and ensures the normal operation of the reactor, but also improves the strength and rigidity of the inlet pipe structure, resulting in high safety. In addition, based on the connection between the branch pipe and the main pipe, the branch pipe passes through and is connected to the reinforcing component, thus forming a double-layer connection, which can reduce the pipe thrust at the connection between the branch pipe and the main pipe, further improving the strength and safety of the entire structure. Attached Figure Description

[0026] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings.

[0027] Figure 1 This is a front view of an inlet pipe structure provided in an embodiment of this utility model;

[0028] Figure 2 yes Figure 1 A cross-sectional view along the AA direction.

[0029] Figure label:

[0030] 10. Supervisor;

[0031] 210. First branch pipe; 220. Second branch pipe;

[0032] 30. Reinforcing component; 310. First reinforcing ring; 320. Second reinforcing ring; 330. Reinforcing cover; 3301. Reinforcing rib; 3302. Reinforcing cover plate; 3303. Leak detection hole;

[0033] 40. Reinforced cavity. Detailed Implementation

[0034] The present invention will be further described below with reference to the accompanying drawings.

[0035] A reactor is a device used to realize a reaction process and is widely used in chemical, oil refining, and metallurgical industries. The propane dehydrogenation to propylene reactor is a key piece of equipment in propylene production. When propane feedstock flows through the catalyst bed in the reactor at high temperature, it is catalytically cracked into propylene and hydrogen. This reaction is strongly endothermic. In the propane dehydrogenation to propylene reactor, a complete cycle of propane to propylene production involves dehydrogenation, steam purging, air heating, vacuuming, and reduction steps before proceeding to the next dehydrogenation cycle. Due to the high temperature of the medium inside the reactor, heat loss must be strictly controlled during the reaction process to ensure the reactor operates within the required ambient temperature range.

[0036] In some cases, the inlet pipe of the propane dehydrogenation to propylene reactor adopts a cactus-shaped or tree-branch-shaped combined inlet structure, which is welded to the pipe pre-installed on the reactor shell. The combined inlet structure includes the main air pipe and hydrocarbon branch pipes, steam and reducing gas branch pipes welded to the main air pipe. The local stress at the connection between the hydrocarbon branch pipes, steam and reducing gas branch pipes and the main air pipe is too large. Therefore, the cactus-shaped or tree-branch-shaped combined inlet structure needs to be reinforced.

[0037] There are three common forms of reinforcement for pressure vessel openings: reinforcing ring reinforcement, thick-walled tube reinforcement, and integral forging reinforcement. Reinforcing ring reinforcement is the most widely used structural form, with advantages such as simple structure, convenient manufacturing, and readily available raw materials. However, the lap weld at the connection between the reinforcing ring and the vessel wall not only has high local stress but is also prone to welding cracks at the weld root. Furthermore, reinforcing ring reinforcement is not recommended for high-temperature conditions. Thick-walled tube reinforcement involves welding a thickened short tube to the vessel opening. The metal used for reinforcement is directly located in the stress concentration area at the opening. It has good reinforcement effect, simple structure, fewer welds, and easy welding quality inspection, making it a relatively reasonable and ideal reinforcement form. Integral forging reinforcement concentrates the reinforcing metal at the location of the highest stress in the opening, resulting in the lowest stress concentration coefficient. It also uses butt welds with the shell, keeping the weld and its heat-affected zone away from the location of the maximum stress point, resulting in good fatigue resistance. The disadvantages are that this structure has a large forging size, high cost, high manufacturing difficulty, and high requirements for butt welding with the shell.

[0038] Therefore, cactus-shaped or branch-shaped combined inlet structures are typically reinforced with thick-walled tubes and stiffening plates. However, after the reactor has been running for a certain period of time, cracks may still appear at the welds of the combined inlet structure. These cracks need to be repaired by welding under vacuum conditions before the reactor can continue operating.

[0039] Example 1

[0040] like Figure 1 As shown, in order to solve the above-mentioned technical problems, this utility model embodiment provides an inlet pipe structure, including a main pipe 10, a branch pipe, and a reinforcing component 30; the branch pipe is disposed on the outer wall of the main pipe 10 and is connected to the main pipe 10; the reinforcing component 30 is disposed on the outer wall of the main pipe 10; wherein, the branch pipe passes through the reinforcing component 30 and is connected to the reinforcing component 30, the branch pipe, the main pipe 10, and the reinforcing component 30 together form a reinforcing cavity 40, and the reinforcing cavity 40 surrounds the branch pipe.

[0041] As can be seen from the above, by setting up the reinforcing component 30, the reinforcing component 30, together with the main pipe 10 and the branch pipe, forms a reinforcing cavity 40, which surrounds the branch pipe to form a cavity outside the branch pipe to reduce heat dissipation. The connection between the branch pipe and the main pipe 10 is located inside the reinforcing cavity 40 to reduce the temperature difference and stress at the connection between the branch pipe and the main pipe 10. This not only effectively prevents cracks from forming on the inlet pipe structure and ensures the normal operation of the reactor, but also improves the strength and rigidity of the inlet pipe structure, resulting in high safety. In addition, based on the connection between the branch pipe and the main pipe 10, the branch pipe passes through and is connected to the reinforcing component 30, thus forming a double-layer connection, which can reduce the pipe thrust at the connection between the branch pipe and the main pipe 10, further improving the strength and safety of the entire structure.

[0042] It should be noted that the specific number of branch pipes is set according to actual needs, and the medium introduced into the main pipe 10 and each branch pipe can be the same or different; this application does not impose specific restrictions. For example, when the reactor is a propane dehydrogenation to propylene reactor, such as... Figure 1 , Figure 2 As shown, there are two branch pipes, namely the first branch pipe 210 and the second branch pipe 220. The first branch pipe 210 is used to introduce hydrocarbons into the reactor, and the second branch pipe 220 is used to introduce steam and reducing gas into the reactor. The main pipe 10 is used to introduce air into the reactor.

[0043] It should also be noted that the branch pipe is connected to the main pipe 10 by welding.

[0044] It should also be noted that when there are multiple branch pipes, these branch pipes can be arranged at equal intervals around the main pipe or at unequal intervals; this application does not impose specific restrictions. For example, such as... Figure 1 , Figure 2 As shown, two branch pipes are arranged at equal intervals around the circumference of the branch pipe, and the included angle between the two branch pipes is 180°.

[0045] Example 2

[0046] like Figure 1 As shown, the inlet pipe structure includes a main pipe 10, a branch pipe, and a reinforcing component 30; the branch pipe is disposed on the outer wall of the main pipe 10 and is connected to the main pipe 10; the reinforcing component 30 is disposed on the outer wall of the main pipe 10; wherein, the branch pipe passes through the reinforcing component 30 and is connected to the reinforcing component 30, the branch pipe, the main pipe 10, and the reinforcing component 30 together form a reinforcing cavity 40, and the reinforcing cavity 40 surrounds the branch pipe.

[0047] As can be seen from the above, by setting up the reinforcing component 30, the reinforcing component 30, together with the main pipe 10 and the branch pipe, forms a reinforcing cavity 40, which surrounds the branch pipe to form a cavity outside the branch pipe to reduce heat dissipation. The connection between the branch pipe and the main pipe 10 is located inside the reinforcing cavity 40 to reduce the temperature difference and stress at the connection between the branch pipe and the main pipe 10. This not only effectively prevents cracks from forming on the inlet pipe structure and ensures the normal operation of the reactor, but also improves the strength and rigidity of the inlet pipe structure, resulting in high safety. In addition, based on the connection between the branch pipe and the main pipe 10, the branch pipe passes through and is connected to the reinforcing component 30, thus forming a double-layer connection, which can reduce the pipe thrust at the connection between the branch pipe and the main pipe 10, further improving the strength and safety of the entire structure.

[0048] It should be noted that the specific number of branch pipes is set according to actual needs, and the medium introduced into the main pipe 10 and each branch pipe can be the same or different; this application does not impose specific restrictions. For example, when the reactor is a propane dehydrogenation to propylene reactor, such as... Figure 1 , Figure 2 As shown, there are two branch pipes, namely the first branch pipe 210 and the second branch pipe 220. The first branch pipe 210 is used to introduce hydrocarbons into the reactor, and the second branch pipe 220 is used to introduce steam and reducing gas into the reactor. The main pipe 10 is used to introduce air into the reactor.

[0049] It should also be noted that the branch pipe is connected to the main pipe 10 by welding.

[0050] It should also be noted that when there are multiple branch pipes, these branch pipes can be arranged at equal intervals around the main pipe or at unequal intervals around the main pipe; this application does not impose specific restrictions. For example, such as... Figure 1 , Figure 2 As shown, two branch pipes are arranged at equal intervals around the main pipe in a 10-degree circumference, and the included angle between the two branch pipes is 180°.

[0051] like Figure 1As shown, in some embodiments, the reinforcing component 30 includes a first reinforcing ring 310, a second reinforcing ring 320, and a reinforcing cover 330; the first reinforcing ring 310 is disposed on the outer wall of the main pipe 10; the second reinforcing ring 320 is disposed on the outer wall of the main pipe 10, and the second reinforcing ring 320 and the first reinforcing ring 310 are arranged at an axial distance along the main pipe 10, and the branch pipe is located between the first reinforcing ring 310 and the second reinforcing ring 320; the reinforcing cover 330 is disposed on the outer wall of the main pipe 10 and is connected to the first reinforcing ring 310 and the second reinforcing ring 320 respectively, and the reinforcing cover 330 corresponds to the branch pipe one by one; wherein, the branch pipe passes through the corresponding reinforcing cover 330 and is connected to the reinforcing cover 330.

[0052] The first reinforcing ring 310, the second reinforcing ring 320, and the reinforcing cover 330 provide a structural basis for forming the reinforcing cavity 40, and the first reinforcing ring 310 and the second reinforcing ring 320 improve the strength and rigidity of the main pipe 10. In addition, by setting the reinforcing cover 330 to correspond one-to-one with the branch pipes and connecting the reinforcing cover 330 to the corresponding branch pipes, a reinforcing cavity 40 corresponding to each branch pipe can be formed. The reinforcing cavity 40 surrounds the corresponding branch pipe, thereby making each reinforcing cavity 40 independent of each other, reducing the heat transfer between the reinforcing cavities 40 and causing temperature difference changes at the connection between the branch pipe and the main pipe 10.

[0053] It should be noted that both the first reinforcing ring 310 and the second reinforcing ring 320 are annular; the thicknesses of the first reinforcing ring 310 and the second reinforcing ring 320 may be equal or unequal, and this application does not impose specific restrictions; in addition, the thickness of the first reinforcing ring 310 refers to the difference between the outer diameter and the inner diameter of the first reinforcing ring 310, and the thickness of the second reinforcing ring 320 refers to the difference between the outer diameter and the inner diameter of the second reinforcing ring 320.

[0054] It should also be noted that when there are multiple reinforcing cover sections 330, these sections can be arranged at equal intervals around the main pipe 10 or at unequal intervals around the main pipe 10, depending on the arrangement of the branch pipes. This application does not impose specific limitations; for example, such as Figure 1 , Figure 2 As shown, two reinforcing covers 330 are arranged at equal intervals around the main tube 10, and the included angle between the two reinforcing covers 330 is 180°.

[0055] It should also be noted that the first reinforcing ring 310 and the second reinforcing ring 320 are connected to the main pipe 10 by welding.

[0056] like Figure 1 , Figure 2As shown, in some embodiments, the reinforced cover 330 includes two reinforcing ribs 3301 and a reinforcing cover 3302; the two reinforcing ribs 3301 are connected to the outer wall of the main pipe 10 and are arranged at intervals along the circumference of the main pipe 10, the two ends of the reinforcing ribs 3301 are respectively connected to the first reinforcing ring 310 and the second reinforcing ring 320, and the corresponding branch pipes are located between the two reinforcing ribs 3301; the reinforcing cover 3302 is connected to the first reinforcing ring 310, the second reinforcing ring 320 and the two reinforcing ribs 3301 respectively, wherein the corresponding branch pipes pass through the reinforcing cover 3302 and are connected to the reinforcing cover 3302.

[0057] The reinforcing ribs 3301 and the reinforcing cover 3302 provide a structural foundation for the reinforced cover 330. The reinforcing ribs 3301 enhance the strength and rigidity of the main pipe 10, while the reinforcing cover 3302 enhances the strength and rigidity of the branch pipe. The connection between the reinforcing cover 3302, the first reinforcing ring 310, the second reinforcing ring 320, and the two reinforcing ribs 3301 forms an integrated box structure, thereby improving the overall strength and rigidity of the inlet pipe structure, reducing heat dissipation by utilizing the space within the box, and minimizing the temperature difference at the connection between the branch pipe and the main pipe 10. Furthermore, by connecting the reinforcing cover 3302 to the branch pipe, which is also connected to the main pipe 10, it is equivalent to connecting the branch pipe to a double-shell structure, thus reducing the pipe thrust at the connection between the branch pipe and the main pipe 10.

[0058] It should be noted that the reinforcing rib plate 3301 is connected to the main pipe 10, the first reinforcing ring 310, and the second reinforcing ring 320 by welding.

[0059] In some embodiments, the top and / or bottom of the reinforcing cover 3302 are provided with leak detection holes 3303.

[0060] By setting a leak detection hole 3303, when a crack occurs at the weld between the branch pipe and the main pipe 10, not only can the gas in the reinforcing cavity 40 be emptied and the cracked weld repaired as soon as possible through the leak detection hole 3303, but also the protective gas such as low temperature air or nitrogen can be injected through the leak detection hole 3303 to allow the reactor to continue operating.

[0061] It should be noted that, as Figure 1 As shown, the top and bottom of the reinforcing cover plate 3302 are provided with leak detection holes 3303.

[0062] In some embodiments, the reinforcing cover plate 3302 is arc-shaped.

[0063] It should be noted that, as Figure 1 As shown, the reinforcing cover 3302 may be parallel to the outer wall of the main pipe 10.

[0064] In some embodiments, the branch pipe is a straight pipe or a tapered pipe, and the main pipe 10 is a straight pipe or a tapered pipe; wherein, the branch pipe and the main pipe 10 have an angle between them, and the angle is less than 90°.

[0065] It should be noted that, as Figure 1 As shown, the branch pipe is a straight pipe and the main pipe 10 is a tapered pipe; of course, both the branch pipe and the main pipe 10 can be set in a straight pipe.

[0066] It should also be noted that when there are multiple branch pipes, the angle between each branch pipe and the main pipe 10 can be equal or unequal; this application does not impose specific restrictions. For example, if... Figure 1 As shown, the angle between the first branch pipe 210 and the main pipe 10 is α, and the angle between the second branch pipe 220 and the main pipe 10 is β. α and β are not equal.

[0067] In some embodiments, the diameter of the main pipe 10 is larger than the diameter of the branch pipe.

[0068] By limiting the diameter of the main pipe 10 to be larger than that of the branch pipe, the stability and reliability of the inlet pipe structure can be guaranteed.

[0069] It should be noted that when there are multiple branch pipes, the diameter of each branch pipe may be equal or unequal; this application does not impose specific restrictions, but the diameter of each branch pipe is smaller than the diameter of the main pipe 10; for example, as Figure 1 As shown, the diameter of the main pipe 10 is d1, the diameter of the first branch pipe 210 is d2, and the diameter of the second branch pipe 220 is d3, where d1 > d2 > d3.

[0070] In some embodiments, the first reinforcing ring 310 and the second reinforcing ring 320 have a first preset distance, wherein the first preset distance is twice the diameter of the branch pipe.

[0071] By limiting the first preset distance between the first reinforcing ring 310 and the second reinforcing ring 320, the size of the reinforcing cavity 40 is limited, so that the reinforcing cavity 40 can reduce heat loss while ensuring the injection amount of protective gas. This avoids the situation where the distance between the first reinforcing ring 310 and the second reinforcing ring 320 is too large, resulting in an oversized reinforcing cavity 40, which would increase heat loss and increase the temperature difference at the connection between the branch pipe and the main pipe 10. It also avoids the situation where the distance between the first reinforcing ring 310 and the second reinforcing ring 320 is too small, resulting in an undersized reinforcing cavity 40, which would cause insufficient injection of protective gas and make it impossible to ensure the normal operation of the reactor when cracked welds occur.

[0072] It should be noted that when there are multiple branch pipes, the largest diameter among them should be used; for example, ... Figure 2 As shown, the diameter d2 of the first branch pipe 210 is greater than the diameter d3 of the second branch pipe 220, so the first preset spacing is twice the diameter d2.

[0073] In some embodiments, the two reinforcing ribs 3301 of the reinforcing cover 330 have a second preset distance, wherein the second preset distance is twice the diameter of the branch pipe corresponding to the reinforcing cover 330.

[0074] By limiting the second preset distance between the two reinforcing ribs 3301, the size of the reinforcing cavity 40 is limited, so that the reinforcing cavity 40 can reduce heat loss while ensuring the amount of protective gas injected. This avoids the situation where the distance between the two reinforcing ribs 3301 is too large, resulting in an excessively large reinforcing cavity 40, which would increase heat loss and increase the temperature difference at the connection between the branch pipe and the main pipe 10. It also avoids the situation where the distance between the two reinforcing ribs 3301 is too small, resulting in an excessively small reinforcing cavity 40, which would cause insufficient injection of protective gas and make it impossible to ensure the normal operation of the reactor when cracked welds occur.

[0075] It should be noted that when there are multiple branch pipes, since each branch pipe corresponds one-to-one with a different reinforcing cover 330, the diameter of the branch pipe corresponding to that reinforcing cover 330 should be selected; for example, as... Figure 2 As shown, for the reinforcing cover portion 330 corresponding to the first branch pipe 210, the second preset distance between the two reinforcing ribs 3301 of the reinforcing cover portion 330 is twice the diameter d2 of the first branch pipe 210, and for the reinforcing cover portion 330 corresponding to the second branch pipe 220, the second preset distance between the two reinforcing ribs 3301 of the reinforcing cover portion 330 is twice the diameter d3 of the second branch pipe 220.

[0076] Example 3

[0077] like Figure 1-2 As shown, this utility model embodiment also provides a reactor, including the inlet pipe structure of any embodiment of this utility model, thereby having all the technical effects brought about by the technical solutions of the above embodiments.

[0078] Although the present invention has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An inlet pipe structure, characterized in that, include: director; A branch pipe is installed on the outer wall of the main pipe and is connected to the main pipe; as well as A reinforcing component is disposed on the outer wall of the main tube; The branch pipe passes through and is connected to the reinforcing component. The branch pipe, the main pipe, and the reinforcing component together form a reinforcing cavity, and the reinforcing cavity surrounds the branch pipe.

2. The inlet pipe structure according to claim 1, characterized in that, The reinforcement components include: The first reinforcing ring is disposed on the outer wall of the main tube; A second reinforcing ring is disposed on the outer wall of the main pipe, and the second reinforcing ring and the first reinforcing ring are arranged axially spaced apart along the main pipe, with the branch pipe located between the first reinforcing ring and the second reinforcing ring; and A reinforcing cover is provided on the outer wall of the main pipe and is connected to the first reinforcing ring and the second reinforcing ring respectively. The reinforcing cover corresponds to the branch pipe one by one. The branch pipe is inserted into and connected to the corresponding reinforced cover.

3. The inlet pipe structure according to claim 2, characterized in that, The reinforced coverage includes: Two reinforcing ribs are connected to the outer wall of the main pipe and arranged at intervals along the circumference of the main pipe. The two ends of each reinforcing rib are connected to the first reinforcing ring and the second reinforcing ring, respectively, and the corresponding branch pipe is located between the two reinforcing ribs. A reinforcing cover plate is connected to the first reinforcing ring, the second reinforcing ring, and the two reinforcing ribs, respectively, wherein the corresponding branch pipe passes through the reinforcing cover plate and is connected to the reinforcing cover plate.

4. The inlet pipe structure according to claim 3, characterized in that, Leak detection holes are provided at the top and / or bottom of the reinforcing cover.

5. The inlet pipe structure according to claim 3, characterized in that, The reinforcing cover plate is arc-shaped.

6. The inlet pipe structure according to any one of claims 1-5, characterized in that, The branch pipe is a straight pipe or a tapered pipe, and the main pipe is a straight pipe or a tapered pipe; wherein, there is an angle between the branch pipe and the main pipe, and the angle is less than 90°.

7. The inlet pipe structure according to any one of claims 1-5, characterized in that, The diameter of the main pipe is larger than the diameter of the branch pipe.

8. The inlet pipe structure according to any one of claims 2-5, characterized in that, The first reinforcing ring and the second reinforcing ring have a first preset distance, wherein the first preset distance is twice the diameter of the branch pipe.

9. The inlet pipe structure according to any one of claims 3-5, characterized in that, The two reinforcing ribs of the reinforced cover have a second preset distance between them, wherein the second preset distance is twice the diameter of the branch pipe corresponding to the reinforced cover.

10. A reactor, characterized in that, Includes the import takeover structure as described in any one of claims 1-9.

Images