High-temperature and high-pressure sealed structure and tubular reactor

Abstract

This utility model relates to the field of reactors, and discloses a high-temperature and high-pressure sealing structure and a tubular reactor. The high-temperature and high-pressure sealing structure is used to seal the end of a reaction tube and includes a plug, a sealing seat, a clamping cap, and multiple fasteners. The plug includes a body and an annular connecting part. The body is used to partially insert and fit against the end to seal the end, and the annular connecting part is connected to the part of the body that extends out of the reaction tube. The sealing seat is used to fix to the reaction tube and includes an annular sealing part located between the end and the annular connecting part. A flexible graphite gasket is provided between the annular sealing part and the annular connecting part. The clamping cap is detachably connected to the sealing seat and includes a clamping part located on the side of the annular connecting part opposite to the annular sealing part. The clamping part has multiple axially arranged screw holes. The fasteners are used to screw into the screw holes and abut against the annular connecting part to seal the end. This high-temperature and high-pressure sealing structure has a good sealing effect when applied to a high-temperature and high-pressure tubular reactor.

Description

Technical Field

[0001] This utility model relates to the field of reactor technology, specifically to a high-temperature and high-pressure sealing structure and a tubular reactor. Background Technology

[0002] In existing technologies, conventional tubular reactors typically employ two sealing methods: soft seals and hard seals. Soft seals usually use sealing rings made of materials such as rubber or silicone. Due to the inherent physical properties of these materials, they are generally not heat-resistant (their tolerance temperature is typically below 200°C), making them unsuitable for high-temperature, high-pressure reactors. Existing high-temperature reactors typically use hard seals. However, hard seals have higher installation requirements and are more difficult to implement. This type of seal requires placing a flexible graphite gasket in the sealing groove between the reaction tube and the pressure cap, and then tightening the reaction tube and pressure cap to achieve a seal at the end of the reaction tube. The aforementioned high-temperature, high-pressure sealing structure requires a sufficiently tight connection between the reaction tube and the pressure cap to achieve a good sealing effect. However, in actual engineering, the reactor interior usually experiences a certain pressure, causing slight deformation of the high-temperature, high-pressure sealing structure after prolonged use. This affects the tightness of the connection between the reaction tube and the pressure cap, resulting in an unsatisfactory sealing effect. Utility Model Content

[0003] The purpose of this invention is to overcome the problem that the sealing effect of existing high-temperature and high-pressure sealing structures applied to high-temperature reactors (temperatures exceeding 200°C) is not ideal, and to provide a high-temperature and high-pressure sealing structure and a tubular reactor. This high-temperature and high-pressure sealing structure can be applied to high-temperature and high-pressure reactors with a maximum temperature of 800°C and a pressure of 1.6MPa-10MPa, and has a better sealing effect.

[0004] To achieve the above objectives, this utility model provides a high-temperature and high-pressure sealing structure for sealing the end of a reaction tube. The high-temperature and high-pressure sealing structure includes: A plug, comprising a body portion and an annular connecting portion, the body portion being used to partially insert into and fit against the end portion to seal the end portion, and the annular connecting portion being connected to the outer periphery of the portion of the body portion extending out of the reaction tube; A sealing seat is provided for fixed connection with the reaction tube and includes an annular sealing portion located between the end and the annular connecting portion, and a flexible graphite gasket is provided between the annular sealing portion and the annular connecting portion; A clamping cap, detachably connected to the sealing seat, includes a clamping portion located on the side of the annular connecting portion opposite to the annular sealing portion, the clamping portion having a plurality of threaded holes arranged axially along the reaction tube; and a plurality of fasteners for screwing into the threaded holes and abutting against the annular connecting portion, so that the annular connecting portion, the flexible graphite gasket and the annular sealing portion are pressed against each other to seal the end.

[0005] Preferably, the annular sealing portion has a sealing groove on the side facing the annular connecting portion or the side facing the annular sealing portion, and the flexible graphite gasket is disposed in the sealing groove; Preferably, the plurality of screw holes are evenly arranged along the circumference of the annular connection portion.

[0006] Preferably, the annular sealing portion has the sealing groove on the side facing the annular connecting portion, and the annular connecting portion has a mating boss on the side facing the sealing groove, the mating boss being used to abut against the flexible graphite gasket; Preferably, the body portion has a thermocouple through hole arranged along the axial direction of the reaction tube, the thermocouple through hole being used to install a thermocouple.

[0007] Preferably, the sealing seat further includes a first sleeve portion that is bent and connected to the annular sealing portion, the first sleeve portion being used to be fixedly sleeved on the outer periphery of the end.

[0008] Preferably, the clamping cap further includes a second sleeve portion that is bent and connected to the clamping part. The second sleeve portion is sleeved on the outer periphery of the sealing seat and the annular connecting part and is screwed to the first sleeve portion.

[0009] Preferably, the outer contour of the cross-section of the clamping cap in the circumferential direction of the reaction tube is a regular polygon; Preferably, the peripheral side of the clamping cap has a wrench groove.

[0010] Preferably, the clamping part is a regular polygonal pressure plate structure and has multiple outer surfaces. Each outer surface is provided with a wrench groove, and each wrench groove is provided at the center position of each side of the regular polygon. Preferably, the number of screw holes is the same as the number of wrench slots, and the distance from each screw hole to each adjacent wrench slot is the same.

[0011] Preferably, the center of the clamping part has a through hole, and a portion of the body part passes through the through hole; Preferably, the outer peripheral surface of the body portion fits against the inner wall surface of the annular sealing portion.

[0012] A second aspect of this utility model provides a tubular reactor, the tubular reactor comprising: reaction tube; and The aforementioned high-temperature and high-pressure sealing structure seals at least one of the upper and lower ends of the reaction tube.

[0013] Preferably, the sealing seat is welded to the reaction tube; Preferably, the body portion has a thermocouple through hole arranged along the axial direction of the reaction tube, a thermocouple is provided in the thermocouple through hole, the outer peripheral surface of the thermocouple is attached to the thermocouple through hole, and the thermocouple is fixedly connected to the body portion.

[0014] Through the above technical solution, the high-temperature and high-pressure sealing structure provided by this utility model, during installation, firstly, a flexible graphite gasket is placed on the sealing seat, and the plug portion is inserted into the interior of the reaction tube; then, a compression cap is connected to the sealing seat, so that the annular connecting part of the plug is located between the annular sealing part of the sealing seat and the compression part of the compression cap; finally, multiple fasteners are screwed into the screw holes and abut against the annular connecting part, so that the annular connecting part, the flexible graphite gasket, and the annular sealing part are mutually compressed, thereby realizing the installation of the high-temperature and high-pressure sealing structure. Compared with the traditional technical solution of setting a flexible graphite gasket between the compression cap and the reaction tube, the high-temperature and high-pressure sealing structure provided by this utility model is provided with multiple fasteners for further compressing the flexible graphite gasket. The setting of fasteners and plugs effectively increases the tightness between the flexible graphite gasket and the annular connecting parts and annular sealing parts on both sides, thereby giving the high-temperature and high-pressure sealing structure provided by this utility model a better sealing effect. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a tubular reactor provided by this utility model; Figure 2 yes Figure 1 A partial structural diagram of section I of the tubular reactor shown; Figure 3 This is a cross-sectional structural diagram of a high-temperature and high-pressure sealing structure provided by this utility model; Figure 4 This is a cross-sectional structural diagram of a sealing seat provided by this utility model; Figure 5 This is a cross-sectional structural diagram of a plug provided by this utility model; Figure 6 This is a longitudinal cross-sectional structural diagram of a compression cap provided by this utility model; Figure 7 yes Figure 6 The diagram shows a cross-sectional view of the compression cap.

[0016] Explanation of reference numerals in the attached figures 1-Tube reactor; 10-Reaction tube; 11-End; 20-High temperature and high pressure sealing structure; 21-Plug; 22-Sealing seat; 23-Flexible graphite gasket; 24-Compression cap; 25-Fastener; 30-Thermocouple; 40-Radiator; 210-Thermocouple through hole; 211-Body part; 212-Annular connecting part; 213-Matching boss; 220-Sealing groove; 221-Annular sealing part; 222-First sleeve part; 241-Clamping part; 242-Second sleeve part; 24a-Wrench groove; 24b-Outer surface; 24c-Screw hole. Detailed Implementation

[0017] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0018] It should be noted that, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front," and "rear," etc., indicating orientation or positional relationships, are only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0019] Furthermore, the terms "first," "second," and similar words used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. "Vertical" is not strictly vertical, but within the allowable error range. "Parallel" is not strictly parallel, but within the allowable error range. Words such as "including" or "comprising" mean that the element preceding the word encompasses the element listed after it, and do not exclude the possibility of encompassing other elements as well.

[0020] Please see Figure 1 , Figure 2 and Figure 3 , Figure 1 This is a schematic diagram of the structure of a tubular reactor provided by this utility model; Figure 2 yes Figure 1 A partial structural diagram of section I of the tubular reactor shown; Figure 3This is a cross-sectional schematic diagram of a high-temperature and high-pressure sealing structure provided by this utility model. One aspect of this utility model provides a high-temperature and high-pressure sealing structure 20, which is used to seal the end 11 of a reaction tube 10. The high-temperature and high-pressure sealing structure 20 includes a plug 21, a sealing seat 22, a compression cap 24, and multiple fasteners 25. The plug 21 includes a body portion 211 and an annular connecting portion 212. The body portion 211 is used to partially insert into and fit against the end 11 to seal it. The annular connecting portion 212 is connected to the outer periphery of the portion of the body portion 211 extending out of the reaction tube 10. The sealing seat 22 is used to fixably connect to the reaction tube 10 and includes an annular sealing portion 221 located between the end 11 and the annular connecting portion 212. A space is provided between the annular sealing portion 221 and the annular connecting portion 212. A flexible graphite gasket 23 is provided; the clamping cap 24 is detachably connected to the sealing seat 22 and includes a clamping part 241 located on the side of the annular connecting part 212 opposite to the annular sealing part 221, the clamping part 241 having a plurality of screw holes 24c arranged along the axial direction of the reaction tube 10; the fastener 25 is used to screw into the screw holes 24c and abut against the annular connecting part 212, so that the annular connecting part 212, the flexible graphite gasket 23 and the annular sealing part 221 are squeezed against each other to seal the end 11.

[0021] It is understandable that the high-temperature and high-pressure sealing structure 20 provided by this utility model is used for sealing tubular reactors 1, especially small-scale tubular reactors 1 used in laboratory catalyst research and development. During use, the temperature and pressure inside the reaction tube 10 of this type of tubular reactor 1 are typically high, with a maximum pressure reaching 10 MPa and a maximum temperature reaching 800°C. However, the existing high-temperature and high-pressure sealing structure 20 is prone to structural deformation after prolonged use in sealing the reaction tube 10 under high temperature and high pressure (high temperature in this utility model refers to a temperature between 400°C and 800°C; during the reaction in the tubular reactor 1 of this utility model, the pressure inside the reaction tube is around 10 MPa). The deformed high-temperature and high-pressure sealing structure 20 exhibits poor sealing performance. For example, the existing high-temperature and high-pressure sealing structure 20 usually includes a compression cap 24 screwed to the end 11 of the reaction tube 10 and a flexible graphite gasket 23 disposed between the compression cap 24 and the reaction tube 10. When the inside of the reaction tube 10 is in a high-temperature state for a long time, the thread on the compression cap 24 used to connect with the reaction tube 10 is prone to deformation, thereby affecting the tightness of the connection between the reaction tube 10 and the compression cap 24, resulting in an unsatisfactory sealing effect.

[0022] To address the aforementioned technical problems, the high-temperature and high-pressure sealing structure 20 provided by this utility model adds a plug 21, a sealing seat 22, and multiple fasteners 25 to the traditional high-temperature and high-pressure sealing structure 20. The lower part of the plug 21's body 211 is inserted into the end 11 of the reaction tube 10, thereby sealing the end 11 of the reaction tube 10 and achieving initial sealing. The sealing seat 22 is fixedly connected to the reaction tube 10, and the compression cap 24 is detachably connected to the sealing seat 22. The annular connecting part 212 of the plug 21 and the flexible graphite gasket 23 are disposed between the sealing seat 22 and the compression cap 24, achieving further sealing of the end 11. The compression part 241 of the compression cap 24 has a screw hole 24c. Multiple fasteners 25 are screwed into the corresponding screw holes 24c to abut against the annular connecting part 212, causing the annular connecting part 212, the flexible graphite gasket 23, and the annular sealing part 221 to compress against each other, thereby further improving the sealing effect of the high-temperature and high-pressure sealing structure 20.

[0023] The high-temperature and high-pressure sealing structure 20 provided by this utility model features a detachable connection between the compression cap 24 and the sealing seat 22. This avoids the threaded connection between the compression cap 24 and the end 11 of the reaction tube 10 in traditional high-temperature and high-pressure sealing structures 20. When the internal pressure of the reaction tube 10 is too high, the threads on the reaction tube 10 deform under pressure, affecting the sealing effect and the service life of the reaction tube 10. Furthermore, compared to the traditional method of setting a flexible graphite gasket 23 between the compression cap 24 and the reaction tube 10, the high-temperature and high-pressure sealing structure 20 provided by this utility model includes multiple fasteners 25 for further compressing the flexible graphite gasket 23. The fasteners 25 and the plug 21 further improve the tightness between the flexible graphite gasket 23 and the annular connecting parts and annular sealing parts on both sides, thus giving the high-temperature and high-pressure sealing structure 20 a better sealing effect. The high-temperature and high-pressure sealing structure 20 provided by this utility model has a wide range of applications. In addition to being used in high-temperature and high-pressure reactors, it can also adapt to low-temperature environments and be used in low-temperature reactors. In practical engineering, this high-temperature and high-pressure sealing structure 20 can provide a high sealing effect for reactors when applied to reactions with temperatures ranging from -196℃ to 800℃ and pressures ranging from 1.6MPa to 10MPa.

[0024] It is understood that the fastener 25 and the clamping cap 24 are configured as threaded connections. In some embodiments, the fastener 25 is a screw, including a nut and a screw rod, the length of which should be greater than the thickness of the clamping portion 241 (the depth of the screw hole 24c) so that the fastener 25 can effectively improve the sealing effect of the high-temperature and high-pressure sealing structure 20. During installation of the high-temperature and high-pressure sealing structure 20, the flexible graphite gasket 23 is first placed on the sealing seat 22, and the plug 21 is partially inserted into the interior of the reaction tube 10; then the clamping cap 24 is connected to the sealing seat 22, so that the annular connecting portion 212 of the plug 21 is located between the annular sealing portion 221 of the sealing seat 22 and the clamping portion 241 of the clamping cap 24; at this time, the annular connecting portion 212 and the graphite gasket, as well as the graphite gasket and the annular sealing portion 221, are in close contact with each other.

[0025] Finally, multiple fasteners 25 (screws in this embodiment) are screwed into the screw hole 24c until the surface of the nut facing the screw is in contact with the surface of the clamping part 241 facing away from the annular connecting part 212, and the end 11 of the screw abuts against the annular connecting part 212; under the cooperation of the fasteners 25 and the clamping part 241, the flexible graphite washer 23 undergoes slight deformation: the thickness of the flexible graphite washer 23 corresponding to the position of the fastener 25 decreases, and it is squeezed to form a small indentation. The flexible graphite washer 23 at the indentation has a large pressure with the annular connecting part 212 and the annular sealing part 221, so that the high temperature and high pressure sealing structure 20 has high sealing performance.

[0026] It is understood that the above is only one possible implementation of the fastener 25 provided by this utility model. The fastener 25 provided by this utility model is not limited to screws, but can also be other fasteners 25 with threaded connection structures.

[0027] Compared to the traditional high-temperature and high-pressure sealing structure 20 where the compression cap 24 is threadedly connected to the end 11 of the reaction tube 10, this invention transfers a significant portion of the force between the compression cap 24 and the reaction tube 10 (compression cap 24 and sealing seat 22) to the connection between the fastener 25 and the compression cap 24. This effectively avoids the problem of deformation at the connection between the compression cap 24 and the reaction tube 10 (compression cap 24 and sealing seat 22) affecting the sealing effect. Simultaneously, this invention distributes the sealing force across multiple threaded connections, thereby reducing the axial stress on each threaded connection and effectively preventing excessive stress on the threaded connection structure, which could lead to failure.

[0028] Please continue reading. Figure 3 And please see Figure 4 and Figure 7 , Figure 4 This is a cross-sectional structural diagram of a sealing seat provided by this utility model; Figure 7 yes Figure 6 The diagram shows a cross-sectional view of the compression cap. In some preferred embodiments, the annular sealing portion 221 has a sealing groove 220 on the side facing the annular connecting portion 212 or on the side facing the annular sealing portion 221, and the flexible graphite gasket 23 is disposed in the sealing groove 220.

[0029] This embodiment provides a sealing groove 220 on the side of the annular sealing portion 221 facing the annular connecting portion 212 or on the side of the annular connecting portion 212 facing the annular sealing portion 221, thereby fixing the position of the flexible graphite gasket 23. This makes the high-temperature and high-pressure sealing structure 20 less prone to installation failure due to displacement of the flexible graphite gasket 23 during installation. In some preferred embodiments, a plurality of screw holes 24c are evenly arranged along the circumference of the annular connecting portion 212; in some preferred embodiments, the sealing groove 220 is an annular sealing groove 220, and the axis of the annulus coincides with the axis of the reaction tube 10, thereby making the end 11 of the reaction tube 10 subjected to uniform force along the circumference, and the high-temperature and high-pressure sealing structure 20 has a better sealing effect.

[0030] Understandably, the sealing groove 220 can also provide radial restriction for the deformation of the flexible graphite gasket 23. As mentioned above, under the combined action of the fastener 25 and the clamping part 241, the thickness of the flexible graphite gasket 23 at the position corresponding to the fastener 25 decreases, and it is squeezed to form a small indentation. At the same time, the sealing groove 220 provides radial restriction for the flexible graphite gasket 23, which increases the thickness of the flexible graphite gasket 23 at the position between the two connected indentations, thereby increasing the holding pressure between the increased thickness of the flexible graphite gasket 23 and the annular connecting part 212 and the annular sealing part 221, and further improving the sealing effect of the high temperature and high pressure sealing structure 20.

[0031] Please continue reading. Figure 3 And please see Figure 5 , Figure 5 This is a cross-sectional structural diagram of a plug provided by this utility model. In some preferred embodiments, the annular sealing portion 221 has a sealing groove 220 on the side facing the annular connecting portion 212, and the annular connecting portion 212 has a mating boss 213 on the side facing the sealing groove 220. The mating boss 213 is used to abut against the flexible graphite gasket 23. It can be understood that, in this embodiment, the boss structure provided on the plug 21 and the sealing groove 220 structure on the sealing seat 22 cooperate with each other to further improve the sealing performance of the high-temperature and high-pressure sealing structure 20.

[0032] In some preferred embodiments, the body portion 211 has a thermocouple through-hole 210 arranged axially along the reaction tube 10, the thermocouple through-hole 210 being used to house a thermocouple 30. It is understood that during use, the high-temperature, high-pressure sealing structure 20 requires the thermocouple 30 to seal the thermocouple through-hole 210, or the thermocouple 30 is disposed within the thermocouple through-hole 210, and the thermocouple through-hole 210 is sealed by other sealing elements. This embodiment allows the reactor using the high-temperature, high-pressure sealing structure 20 to easily acquire real-time temperature data inside the reaction tube 10 during the reaction process.

[0033] Please continue reading. Figure 2 and Figure 3 In some preferred embodiments, the sealing seat 22 further includes a first sleeve portion 222 that is bent and connected to the annular sealing portion 221, the first sleeve portion 222 being used to be fixedly sleeved on the outer periphery of the end 11.

[0034] The sealing seat 22 in this embodiment also includes a first sleeve portion 222. The provision of the first sleeve portion 222 increases the connection area between the sealing seat 22 and the reaction tube 10, thereby allowing the sealing seat 22 to be securely connected to the end 11 of the reaction tube 10. Preferably, the inner wall surface of the first sleeve portion 222 is in contact with the outer wall surface of the reaction tube 10, and the annular sealing portion 221 is in contact with the end face of the reaction tube 10 facing the reaction tube 10, so that the reaction tube 10 used in the high temperature and high pressure sealing structure 20 has better sealing performance.

[0035] Please continue reading. Figure 2 and Figure 3 In some preferred embodiments, the clamping cap 24 further includes a second sleeve portion 242 that is bent and connected to the clamping portion 241. The second sleeve portion 242 is sleeved on the outer periphery of the sealing seat 22 and the annular connecting portion 212, and is screwed to the first sleeve portion 222. The clamping cap 24 in this embodiment further includes a second sleeve portion 242. The provision of the second sleeve portion 242 increases the connection area between the clamping cap 24 and the sealing seat 22, thereby allowing the clamping cap 24 to be securely connected to the sealing seat 22. It is understood that the outer wall surface of the first sleeve portion 222 and the inner wall surface of the second sleeve portion 242 respectively have threads that can cooperate with each other, thereby realizing the screwed connection between the second sleeve portion 242 and the first sleeve portion 222. Preferably, as... Figure 2 As shown, the second sleeve portion 242 has a shape that matches the annular connecting portion 212 of the sealing seat 22 and the plug 21. When the high temperature and high pressure sealing structure 20 is in the combined state, the inner wall surface of the second sleeve portion 242 fits against the outer wall surface of the first sleeve portion 222 and the outer peripheral side surface of the annular connecting portion 212, thereby further improving the sealing effect of the high temperature and high pressure sealing structure 20.

[0036] Please continue reading. Figure 2 , Figure 3 and Figure 7 And please see Figure 6 , Figure 6 This is a longitudinal cross-sectional view of a compression cap provided by this utility model. In some preferred embodiments, the outer contour of the compression cap 24 in the circumferential direction of the reaction tube 10 is a regular polygon. In some preferred embodiments, the peripheral side of the compression cap 24 has a wrench groove 24a. This arrangement allows the compression cap 24 to be easily connected to the sealing seat 22 using a wrench during assembly of the high-temperature and high-pressure sealing structure 20. More preferably, the outer contour of the compression cap 24 in the circumferential direction of the reaction tube 10 is a regular hexagon.

[0037] Please continue reading. Figure 6 and Figure 7 In some preferred embodiments, the clamping part 241 is a regular polygonal pressure plate structure with multiple outer surfaces 24b, each outer surface 24b having a wrench groove 24a, and each wrench groove 24a being located at the center of each side of the regular polygon. In some preferred embodiments, the number of screw holes 24c is the same as the number of wrench grooves 24a, and the distance between each screw hole 24c and any two adjacent wrench grooves 24a is the same.

[0038] It is understood that the above-described embodiments result in the compression cap 24 having relatively uniform mechanical strength in the circumferential direction, and the high-temperature and high-pressure sealing structure 20 having good sealing performance at all points in the circumferential direction. In some embodiments, the outer peripheral side of the second sleeve portion 242 has a knurled structure; when assembling the high-temperature and high-pressure sealing structure 20, the compression cap 24 and the sealing seat 22 are first connected by threads through the first sleeve portion 222 and the second sleeve portion 242, then the compression cap 24 and the sealing seat 22 are tightened by aligning the wrench with the wrench groove 24a, and finally multiple fasteners 25 are installed to further improve the tightness / pressure between the flexible graphite gasket 23 and the annular connecting portion 212 and the annular sealing portion 221.

[0039] Please continue reading. Figure 2 , Figure 3 , Figure 5 and Figure 6 In some preferred embodiments, the pressing part 241 has a through hole at its center, and a portion of the body part 211 passes through the through hole; preferably, the wall of the through hole fits against the peripheral sidewall of the body part 211, thereby further improving the sealing performance of the high-temperature and high-pressure sealing structure 20. In some preferred embodiments, the outer peripheral surface of the body part 211 fits against the inner wall surface of the annular sealing part 221, thereby further improving the sealing performance of the high-temperature and high-pressure sealing structure 20.

[0040] Please continue reading. Figure 1 The second aspect of this utility model provides a tubular reactor 1, which includes a reaction tube 10 and the aforementioned high-temperature and high-pressure sealing structure 20. The high-temperature and high-pressure sealing structure 20 seals at least one of the upper and lower ends of the reaction tube 10. Preferably, the high-temperature and high-pressure sealing structure 20 provided by this utility model is provided at both the upper and lower ends of the reaction tube 10.

[0041] In some implementations, such as Figure 1 The outer periphery of the reaction tube 10 of the tubular reactor 1 is also fitted with a temperature control device, such as a radiator 40. The reaction tube 10 also has a material inlet and a product outlet.

[0042] Please continue reading. Figure 1 , Figure 2 and Figure 5 In some preferred embodiments, the sealing seat 22 is welded to the reaction tube 10. For example... Figure 2 The lower end of the sealing seat 22 is welded to the outer wall of the reaction tube 10, thereby achieving a fixed connection between the reaction tube 10 and the high-temperature and high-pressure sealing structure 20. Preferably, the sealing seat 22 includes a first sleeve portion 222 and an annular sealing portion 221. The inner wall of the first sleeve portion 222 is attached to the outer wall of the reaction tube 10, and the surface of the annular sealing portion 221 facing the reaction tube 10 is attached to the end face of the reaction tube 10, thereby enabling the high-temperature and high-pressure sealing structure 20 to have a better sealing effect on the end 11 of the reaction tube 10.

[0043] In some preferred embodiments, the body portion 211 has a thermocouple through-hole 210 arranged axially along the reaction tube 10, and a thermocouple 30 is disposed within the thermocouple through-hole 210. The outer peripheral surface of the thermocouple 30 is fitted into the thermocouple through-hole 210, and the thermocouple 30 is fixedly connected to the body portion 211. It is understood that the thermocouple through-hole 210 and the thermocouple 30 allow the tubular reactor 1 to easily obtain real-time temperature data inside the reaction tube 10 during the reaction process. Preferably, the thermocouple 30 and the body portion 211 are welded together to ensure a tight connection between the thermocouple 30 and the plug 21. Figure 5 , Figure 5 In the structure shown, the thermocouple 30 and the plug 21 are welded together on the top of the plug 21 (body part 211).

[0044] Those skilled in the art should understand that the above embodiments or implementation methods are for illustrative purposes only and are not intended to limit the scope of this disclosure. Those skilled in the art should understand that modifications can be made to the above embodiments or implementation methods or equivalent substitutions can be made to some technical features without departing from the scope and spirit of this disclosure. In particular, as long as there is no structural conflict, the various technical features mentioned in the different embodiments or implementation methods can be combined in any way.

Claims

1. A high temperature high pressure seal structure for sealing an end portion (11) of a reaction tube (10), characterized by, The high-temperature and high-pressure sealing structure includes: The plug (21) includes a body (211) and an annular connecting part (212). The body (211) is used to partially insert into and fit against the end (11) to seal the end (11). The annular connecting part (212) is connected to the outer periphery of the portion of the body (211) that extends out of the reaction tube (10). A sealing seat (22) is used to fix the reaction tube (10) and includes an annular sealing part (221) located between the end (11) and the annular connecting part (212), and a flexible graphite gasket (23) is provided between the annular sealing part (221) and the annular connecting part (212). A clamping cap (24), detachably connected to the sealing seat (22), and including a clamping part (241) located on the side of the annular connecting part (212) opposite to the annular sealing part (221), the clamping part (241) having a plurality of screw holes (24c) arranged axially along the reaction tube (10); and Multiple fasteners (25) are screwed into the screw hole (24c) and abut against the annular connection (212), so that the annular connection (212), the flexible graphite washer (23) and the annular sealing part (221) are pressed against each other to seal the end (11).

2. The high temperature, high pressure seal structure of claim 1, wherein, The annular sealing portion (221) has a sealing groove (220) on the side facing the annular connecting portion (212) or the annular connecting portion (212) has a sealing groove (220) on the side facing the annular sealing portion (221), and the flexible graphite gasket (23) is disposed in the sealing groove (220); and / or The plurality of screw holes (24c) are evenly arranged along the circumference of the annular connecting portion (212).

3. The high-temperature and high-pressure sealing structure according to claim 2, characterized in that, The annular sealing portion (221) has a sealing groove (220) on the side facing the annular connecting portion (212), and the annular connecting portion (212) has a mating boss (213) on the side facing the sealing groove (220), the mating boss (213) being used to abut against the flexible graphite gasket (23); and / or The body part (211) has a thermocouple through hole (210) arranged along the axial direction of the reaction tube (10), and the thermocouple through hole (210) is used to install a thermocouple (30).

4. The high-temperature and high-pressure sealing structure according to any one of claims 1-3, characterized in that, The sealing seat (22) further includes a first sleeve portion (222) that is bent and connected to the annular sealing portion (221), the first sleeve portion (222) being used to be fixedly sleeved on the outer periphery of the end (11).

5. The high-temperature and high-pressure sealing structure according to claim 4, characterized in that, The clamping cap (24) also includes a second sleeve (242) that is bent and connected to the clamping part (241). The second sleeve (242) is sleeved on the outer periphery of the sealing seat (22) and the annular connecting part (212) and screwed to the first sleeve (222).

6. The high-temperature and high-pressure sealing structure according to claim 5, characterized in that, The outer contour of the compression cap (24) in the circumferential direction of the reaction tube (10) is a regular polygon; and / or The peripheral side of the clamping cap (24) has a wrench groove (24a).

7. The high-temperature and high-pressure sealing structure according to claim 6, characterized in that, The clamping part (241) is a regular polygonal pressure plate structure and has multiple outer surfaces (24b). Each outer surface (24b) is provided with a wrench groove (24a), and each wrench groove (24a) is provided at the center position of each side of the regular polygon; and / or The number of screw holes (24c) is the same as the number of wrench slots (24a), and the distance between each screw hole (24c) and each corresponding adjacent wrench slot (24a) is the same.

8. The high-temperature and high-pressure sealing structure according to any one of claims 1-3, characterized in that, The clamping part (241) has a through hole at its center, and a portion of the body part (211) passes through the through hole; and / or The outer peripheral surface of the main body (211) is attached to the inner wall surface of the annular sealing part (221).

9. A tubular reactor, characterized in that, The tubular reactor (1) includes: Reaction tube (10); and According to any one of claims 1-8, the high-temperature and high-pressure sealing structure (20) seals at least one of the upper and lower ends of the reaction tube (10).

10. The tubular reactor according to claim 9, characterized in that, The sealing seat (22) is welded to the reaction tube (10); and / or The main body (211) has a thermocouple through hole (210) arranged along the axial direction of the reaction tube (10), a thermocouple (30) is provided in the thermocouple through hole (210), the outer peripheral surface of the thermocouple (30) is attached to the thermocouple through hole (210), and the thermocouple (30) is fixedly connected to the main body (211).

Images