Companion flange, flange assembly and cracking furnace system

Abstract

The utility model belongs to the technical field of chemical equipment, and discloses a companion flange, a flange assembly and a cracking furnace system.The companion flange comprises a first connecting pipe and a second connecting pipe, the second connecting pipe is arranged on the first connecting pipe in a sleeved mode, a gap is reserved between the inner wall of the second connecting pipe and the outer wall of the first connecting pipe, and a heat insulation piece is arranged in the gap. One of the second connecting pipe and the first connecting pipe is connected with the furnace tube, and at least one of the second connecting pipe and the first connecting pipe extends towards the other one and is connected along the direction parallel to the axis of the first connecting pipe and towards the furnace tube, so that one end, facing the furnace tube, of the gap is blocked; therefore, the problem that the heat insulation piece falls into the furnace tube after being damaged can be avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical equipment, in particular to a matching flange, a flange assembly and a cracking furnace system. Background Art

[0002] The ethylene cracking furnace system includes an ethylene cracking furnace and a quench heat exchanger and other equipment. The connection between the furnace tube outlet of the ethylene cracking furnace and the quench heat exchanger is usually connected by an inlet flange and an inlet matching flange. Since the temperature of the medium flowing inside the connection position is relatively high (generally 810℃-900℃), after long-term operation of the system, the insulation material of the inlet matching flange is prone to cracking and damage, and even part of the insulation material may fall into the furnace tube.

[0003] Therefore, it is urgent to propose a matching flange, a flange assembly and a cracking furnace system to solve the above technical problems. Utility Model Content

[0004] The first object of the utility model is to provide a matching flange, which can prevent the problem that the heat insulating member falls into the furnace tube after being damaged.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] Companion flange, including:

[0007] a first connecting pipe;

[0008] The second connecting tube is sleeved on the first connecting tube, a gap is left between the inner wall of the second connecting tube and the outer wall of the first connecting tube, a heat insulating member is arranged in the gap, one of the second connecting tube and the first connecting tube is used to be connected to the furnace pipe, along a direction parallel to the axis of the first connecting tube and toward the furnace pipe, at least one of the second connecting tube and the first connecting tube extends toward the other and is connected to block one end of the gap toward the furnace pipe.

[0009] Optionally, the second connecting pipe is provided with a connecting section, the connecting section is configured to be connected to the furnace pipe, and one end of the first connecting pipe close to the connecting section is located in the second connecting pipe.

[0010] Optionally, an end of the first connecting pipe close to the connecting section is spaced apart from the connecting section.

[0011] Optionally, the second connecting pipe is further provided with a supporting section, which is located on the side of the connecting section away from the furnace tube, and the inner diameter of the supporting section gradually decreases in the direction toward the connecting section, and one end of the first connecting pipe facing the connecting section is arranged on the inner wall of the supporting section.

[0012] Optionally, a protrusion is provided on the outer wall of the first connecting tube, which is located at one end of the first connecting tube away from the connecting section, and extends in a direction away from the axis of the first connecting tube. The protrusion, the first connecting tube and the second connecting tube cooperate to enclose the gap into an accommodating cavity, and the thermal insulation component is filled in the accommodating cavity.

[0013] The second object of the utility model is to provide a flange assembly, which can prevent the problem of the heat insulation component falling into the furnace tube after being damaged.

[0014] To achieve this purpose, the utility model adopts the following technical solutions:

[0015] The flange assembly comprises a first flange component and the above-mentioned matching flange, wherein the matching flange further comprises a second flange component, the second flange component is sleeved on the second connecting pipe, and the second connecting pipe and the first flange component are both connected to the second flange component.

[0016] Optionally, the second connecting pipe further comprises a fitting section, the second flange member is sleeved on the fitting section, an outer wall of the fitting section is provided with a convex edge, and the convex edge is clamped between the first flange member and the second flange member.

[0017] Optionally, the flange assembly further includes a sealing gasket, a concave platform is provided on the side of the first flange member facing the convex edge, the concave platform is an annular structure and is coaxial with the first flange member, the sealing gasket is arranged in the concave platform, and the sealing gasket is pressed between the step plane of the concave platform and the convex edge.

[0018] Optionally, the flange assembly further includes a thermal insulation pad, the outer wall of the first connecting pipe is provided with a protrusion, the protrusion extends in a direction away from the axis of the first connecting pipe, and the thermal insulation pad is clamped between the protrusion and the first flange member.

[0019] The third object of the utility model is to provide a cracking furnace system, which has high operating stability.

[0020] To achieve this purpose, the utility model adopts the following technical solutions:

[0021] The cracking furnace system comprises a cracking furnace tube, a heat exchanger and the above-mentioned flange assembly, wherein one of the second connecting pipe and the first connecting pipe is connected to the cracking furnace tube, and the first flange is connected to the heat exchanger.

[0022] Beneficial effects of the utility model:

[0023] The matching flange provided by the utility model is provided with a first connecting pipe and a second connecting pipe, the second connecting pipe is sleeved on the first connecting pipe with a gap therebetween, along a direction parallel to the axis of the first connecting pipe and toward the furnace pipe, at least one of the second connecting pipe and the first connecting pipe extends toward the other and is connected to block the gap toward one end of the furnace pipe, therefore, the thermal insulation member is arranged in the gap, which can avoid the problem of the thermal insulation member falling into the furnace pipe after being damaged.

[0024] The flange assembly provided by the utility model adopts the above-mentioned matching flange, which can reduce the probability of the heat insulation component falling into the furnace tube after being damaged.

[0025] The cracking furnace system provided by the utility model adopts the above-mentioned flange assembly, and the probability of the heat insulating member in the matching flange being damaged and falling into the furnace tube is low, which has the effect of improving the operation stability of the cracking furnace system. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of a flange assembly provided by an embodiment of the utility model;

[0027] Figure 2 yes Figure 1 A partial enlarged view of point A in the figure.

[0028] In the figure:

[0029] 100, first connecting pipe; 110, protruding portion; 200, second connecting pipe; 210, connecting section; 220, supporting section; 230, matching section; 231, flange; 300, thermal insulation member; 310, protective layer; 320, thermal insulation member body; 400, second flange member;

[0030] 10. First flange; 11. Concave platform; 20. Sealing pad; 30. Heat insulation pad. DETAILED DESCRIPTION

[0031] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0032] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0034] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0035] This embodiment provides a matching flange, which is installed on the furnace tube of an ethylene cracking furnace. The matching flange can prevent the problem of the heat insulating member falling into the furnace tube after being damaged. Of course, the matching flange can also be installed on the furnace tube of other equipment, and the problem of the damaged heat insulating member falling into the furnace tube can also be prevented. This embodiment is described by taking the matching flange installed on the furnace tube of the cracking furnace as an example.

[0036] like Figure 1 As shown, the paired flange includes a first connecting pipe 100 and a second connecting pipe 200, wherein a high temperature fluid (such as cracking gas) can flow in the first connecting pipe 100, the second connecting pipe 200 is sleeved on the first connecting pipe 100, a gap is left between the inner wall of the second connecting pipe 200 and the outer wall of the first connecting pipe 100, a heat insulating member 300 is arranged in the gap, and one of the second connecting pipe 200 and the first connecting pipe 100 is used to be connected to a furnace pipe (not shown in the figure), along a direction parallel to the axis of the first connecting pipe 100 and toward the furnace pipe ( Figure 1 At least one of the second connecting pipe 200 and the first connecting pipe 100 extends toward the other and is connected to block the gap toward one end of the furnace pipe.

[0037] Based on the above design, the second connecting tube 200 is sleeved on the first connecting tube 100 with a gap therebetween. Along a direction parallel to the axis of the first connecting tube 100 and toward the furnace tube, at least one of the second connecting tube 200 and the first connecting tube 100 extends toward the other and is connected to block one end of the gap toward the furnace tube. Therefore, the thermal insulation member 300 is arranged in the gap to avoid the problem of the thermal insulation member 300 falling into the furnace tube after being damaged.

[0038] Alternatively, if Figure 1 As shown, the second connecting pipe 200 is provided with a connecting section 210, and the connecting section 210 is configured to be connected to the furnace pipe, and the end of the first connecting pipe 100 close to the connecting section 210 is located in the second connecting pipe 200, so that the first connecting pipe 100 and the second connecting pipe 200 have good structural consistency on the side close to the furnace pipe. Of course, in other embodiments, the end of the first connecting pipe 100 facing the furnace pipe may extend from the second connecting pipe 200 and be connected to the furnace pipe.

[0039] Furthermore, if Figure 1 As shown, one end of the first connecting tube 100 close to the connecting section 210 is spaced apart from the connecting section 210, that is, the end of the first connecting tube 100 facing the furnace tube is located in the second connecting tube 200 and is spaced apart from the furnace tube. When a high-temperature fluid flows in the first connecting tube 100 for a long time, the first connecting tube 100 is prone to thermal expansion. The technical solution provided in this embodiment provides a reserved space for the thermal expansion of the first connecting tube 100, which can prevent the first connecting tube 100 from being squeezed and damaged due to thermal expansion, and can also prevent the first connecting tube 100 from squeezing the thermal insulation component 300 after thermal expansion, thereby reducing the probability of the thermal insulation component 300 being squeezed and damaged.

[0040] Furthermore, if Figure 1 As shown, the second connecting tube 200 is also provided with a support section 220, which is located on the side of the connecting section 210 away from the furnace tube. Along the direction toward the connecting section 210 (i.e., the D1 direction), the inner diameter of the support section 220 gradually decreases, and the end of the first connecting tube 100 facing the connecting section 210 is arranged on the inner wall of the support section 220. That is to say, in this embodiment, the end of the first connecting tube 100 facing the connecting section 210 cooperates with the inner wall of the support section 220 to achieve the effect of blocking the gap toward one end of the furnace tube. On the one hand, this structural design can make the inner wall of the support section 220 play a certain supporting role for the first connecting tube 100. On the other hand, when the first connecting tube 100 undergoes thermal expansion, the pressing force between the first connecting tube 100 and the inner wall of the support section 220 will increase with the expansion of the first connecting tube 100, thereby increasing the sealing of the gap toward one end of the furnace tube, which can further reduce the probability of the thermal insulation 300 falling into the furnace tube.

[0041] Furthermore, one end of the first connecting tube 100 facing the connecting section 210 is placed on the inner wall of the supporting section 220. When the clamping force between the first connecting tube 100 and the inner wall of the supporting section 220 increases to a certain extent and the first connecting tube 100 continues to expand thermally, the end of the first connecting tube 100 facing the connecting section 210 can be slightly displaced on the inner wall of the supporting section 220 to prevent the first connecting tube 100 from being damaged due to the excessive clamping force, thereby preventing the damaged first connecting tube 100 from falling into the furnace tube.

[0042] It should be pointed out that the first connecting tube 100 and the second connecting tube 200 can cooperate to block the gap toward one end of the furnace tube and can also be other structural forms. For example: along the D1 direction, the diameter of the first connecting tube 100 gradually increases, and the diameter of the second connecting tube 200 gradually decreases, thereby realizing that the first connecting tube 100 and the second connecting tube 200 cooperate to block the gap toward one end of the furnace tube. Alternatively, the diameter of the second connecting tube 200 remains unchanged, and the diameter of the first connecting tube 100 along the D1 direction gradually increases, thereby realizing that the first connecting tube 100 and the second connecting tube 200 cooperate to block the gap toward one end of the furnace tube. Alternatively, the diameters of the first connecting tube 100 and the second connecting tube 200 remain unchanged, and a convex ring coaxial with the first connecting tube 100 is provided on the outer wall of the first connecting tube 100, and the convex ring is connected to the inner wall of the second connecting tube 200 to achieve the end of the gap blocking toward the furnace tube.

[0043] Alternatively, if Figure 1 As shown, the outer wall of the first connecting tube 100 is provided with a protrusion 110, which is located at one end of the first connecting tube 100 away from the connecting section 210, and the protrusion 110 extends in a direction away from the axis of the first connecting tube 100. The protrusion 110 is an annular structure coaxial with the first connecting tube 100. The protrusion 110, the first connecting tube 100 and the second connecting tube 200 cooperate to enclose the gap into a receiving cavity, and the thermal insulation member 300 is filled in the receiving cavity to prevent the thermal insulation member 300 from overflowing from the gap after the thermal expansion. In addition, the structure in which the receiving cavity is filled with the thermal insulation member 300 expands the volume of the thermal insulation member 300 as much as possible, thereby improving the thermal insulation effect of the matching flange.

[0044] Alternatively, if Figure 1 As shown, the thermal insulation member 300 includes a protective layer 310 and a thermal insulation member 300 body. The protective layer 310 is wrapped around the thermal insulation member 300 body. The protective layer 310 can protect the thermal insulation member 300 body. Even if the thermal insulation member 300 body is damaged due to thermal expansion, the protective layer 310 can store the damaged and fallen thermal insulation member 300 body and prevent the damaged and fallen thermal insulation member 300 body from entering the furnace tube.

[0045] In this embodiment, the protective layer 310 is a ceramic fiber paper with a thickness of 1mm-5mm, and the heat insulation member 300 is a zirconium corundum body. Of course, in other embodiments, the protective layer 310 and the heat insulation member 300 can also be made of other common materials in the art, which are not listed here one by one.

[0046] This embodiment also provides a flange assembly, which is used for connecting the furnace tube of the ethylene cracking furnace and the quench heat exchanger. The flange assembly can prevent the problem that the thermal insulation member 300 falls into the furnace tube after being damaged.

[0047] Specifically, Figure 1 As shown, the flange assembly includes a first flange 10 and the above-mentioned matching flange, the first flange 10 is used to connect with the quench heat exchanger, the connecting section 210 of the second connecting pipe 200 is used to connect with the furnace tube of the cracking furnace, and the matching flange also includes a second flange 400, the second flange 400 is sleeved on the second connecting pipe 200, the second connecting pipe 200 and the first flange 10 are both connected to the second flange 400, and the middle hole of the first flange 10 is connected to the first connecting pipe 100, so that the high-temperature fluid can flow in the middle hole of the first flange 10 and the first connecting pipe 100, thereby realizing the connection between the furnace tube of the cracking furnace and the quench heat exchanger. The flange assembly adopts the above-mentioned matching flange, which can reduce the probability of the heat insulation 300 falling into the furnace tube after being damaged, and provides a guarantee for the stable operation of the cracking furnace and the quench heat exchanger.

[0048] Furthermore, if Figure 1 As shown, the second connecting pipe 200 also includes a mating section 230, which is located on the side of the supporting section 220 away from the connecting section 210. The second flange member 400 is sleeved on the mating section 230. The outer wall of the mating section 230 is provided with a flange 231, which extends along the circumference of the mating section 230 and is in a closed loop structure. The flange 231 is clamped between the first flange member 10 and the second flange member 400, thereby realizing the connection between the matching flange and the first flange member 10.

[0049] Furthermore, if Figure 1 and Figure 2 As shown, the flange assembly also includes a sealing gasket 20, a concave platform 11 is provided on the side of the first flange 10 facing the convex edge 231, the concave platform 11 is an annular structure and is coaxial with the first flange 10, the sealing gasket 20 is arranged in the concave platform 11, and the sealing gasket 20 is pressed between the step plane of the concave platform 11 and the convex edge 231, thereby achieving the sealing between the first flange 10 and the convex edge 231, and then achieving the sealing connection between the first flange 10 and the matching flange. In addition, when the system is running, if the sealing gasket 20 is thermally expanded or thermally displaced, the step vertical surface of the concave platform 11 can limit the sealing gasket 20, thereby ensuring the sealing between the first flange 10 and the matching flange.

[0050] Alternatively, if Figure 1 and Figure 2 As shown, the flange assembly also includes a thermal insulation pad 30, which is clamped between the protrusion 110 and the first flange member 10, and has a thermal insulation effect between the first connecting pipe 100 and the first flange member 10. When manufacturing the first flange member 10, common materials in the field (such as stainless steel) can be selected, and there is no need to use thermal insulation materials to manufacture the first flange member 10. It can be seen that this structural design has the effect of reducing production costs.

[0051] Furthermore, if Figure 1 and Figure 2 As shown, the sealing gasket 20 is located on the side of the flange 231 away from the axis of the mating section 230, part of the thermal insulation pad 30 is clamped between the protrusion 110 and the first flange member 10, and part of the thermal insulation pad 30 is clamped between the side of the flange 231 facing the axis of the mating section 230 and the first flange member 10, so as to achieve the thermal insulation effect between the first connecting pipe 100 and the sealing gasket 20, reduce the thermal expansion of the sealing gasket 20, and reduce the probability of sealing failure of the sealing gasket 20 due to excessive temperature.

[0052] Furthermore, if Figure 1 and Figure 2 As shown, the side surface of the protrusion 110 facing the first flange 10 is flush with the side surface of the convex edge 231 facing the first flange 10, so as to improve the consistency of the overall structure of the first flange 10 and the matching flange.

[0053] In this embodiment, the second flange 400 is a loose flange, and the second flange 400 and the first flange 10 are both made of S32168 stainless steel. The first connecting pipe 100 and the second connecting pipe 200 are both made of fully austenitic low-carbon nickel-iron-chromium alloy (Incoloy 800HT). The sealing gasket 20 is a wound gasket (3mm-4.5mm S30408 ​​stainless steel on the outside and flexible graphite on the inside). Its specific preparation process is a relatively mature technology in this field and will not be repeated here. The thermal insulation pad 30 is a ceramic fiber pad, and the ceramic fiber pad is wound by a ceramic fiber rope with a diameter of φ5-φ8. Its specific preparation process is a relatively mature technology in this field and will not be repeated here.

[0054] The present embodiment also provides a cracking furnace system, which has high operating stability. Specifically, the cracking furnace system includes a cracking furnace tube, a heat exchanger and the above-mentioned flange assembly, one of the second connecting pipe 200 and the first connecting pipe 100 is connected to the cracking furnace tube, and the first flange 10 is connected to the heat exchanger. The cracking furnace system adopts the above-mentioned flange assembly, and the probability of the heat insulation member 300 in the matching flange being damaged and falling into the furnace tube is low, which has the effect of improving the operating stability of the cracking furnace system.

[0055] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. Mating flange, characterized in that: include: A first connecting pipe (100); A second connecting tube (200), the second connecting tube (200) is sleeved on the first connecting tube (100), a gap is left between the inner wall of the second connecting tube (200) and the outer wall of the first connecting tube (100), a heat insulating member (300) is arranged in the gap, one of the second connecting tube (200) and the first connecting tube (100) is used to be connected to a furnace pipe, and along a direction parallel to the axis of the first connecting tube (100) and toward the furnace pipe, at least one of the second connecting tube (200) and the first connecting tube (100) extends toward the other and is connected to block one end of the gap toward the furnace pipe.

2. The matching flange according to claim 1, characterized in that: The second connecting pipe (200) is provided with a connecting section (210), the connecting section (210) being configured to be connected to the furnace pipe, and one end of the first connecting pipe (100) close to the connecting section (210) is located inside the second connecting pipe (200).

3. The matching flange according to claim 2, characterized in that: One end of the first connecting pipe (100) close to the connecting section (210) is spaced apart from the connecting section (210).

4. The matching flange according to claim 2, characterized in that: The second connecting pipe (200) is further provided with a supporting section (220), the supporting section (220) being located on a side of the connecting section (210) away from the furnace pipe, the inner diameter of the supporting section (220) gradually decreasing in a direction toward the connecting section (210), and one end of the first connecting pipe (100) facing the connecting section (210) being arranged on the inner wall of the supporting section (220).

5. The matching flange according to claim 2, characterized in that: The outer wall of the first connecting tube (100) is provided with a protrusion (110), and the protrusion (110) is located at one end of the first connecting tube (100) away from the connecting section (210). The protrusion (110) extends in a direction away from the axis of the first connecting tube (100). The protrusion (110), the first connecting tube (100) and the second connecting tube (200) cooperate to enclose the gap to form a receiving cavity, and the thermal insulation component (300) is filled in the receiving cavity.

6. Flange assembly, characterized in that: It comprises a first flange member (10) and a matching flange as claimed in any one of claims 1 to 5, wherein the matching flange further comprises a second flange member (400), the second flange member (400) is sleeved on the second connecting pipe (200), and the second connecting pipe (200) and the first flange member (10) are both connected to the second flange member (400).

7. The flange assembly according to claim 6, characterized in that: The second connecting pipe (200) further comprises a matching section (230), the second flange member (400) being sleeved on the matching section (230), the outer wall of the matching section (230) being provided with a convex edge (231), and the convex edge (231) being sandwiched between the first flange member (10) and the second flange member (400).

8. The flange assembly according to claim 7, characterized in that: The flange assembly further comprises a sealing gasket (20); a concave platform (11) is provided on a side of the first flange member (10) facing the convex edge (231); the concave platform (11) is an annular structure and is coaxial with the first flange member (10); the sealing gasket (20) is arranged in the concave platform (11), and the sealing gasket (20) is pressed between the step plane of the concave platform (11) and the convex edge (231).

9. The flange assembly according to any one of claims 6 to 8, characterized in that: The flange assembly also includes a thermal insulation pad (30), the outer wall of the first connecting pipe (100) is provided with a protrusion (110), the protrusion (110) extends in a direction away from the axis of the first connecting pipe (100), and the thermal insulation pad (30) is clamped between the protrusion (110) and the first flange member (10).

10. A cracking furnace system, characterized in that: It comprises a cracking furnace tube, a heat exchanger and the flange assembly according to any one of claims 6 to 9, wherein one of the second connecting pipe (200) and the first connecting pipe (100) is connected to the cracking furnace tube, and the first flange (10) is connected to the heat exchanger.

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