Quench heat exchanger inlet connection structure

Abstract

The utility model belongs to the technical field of quenching heat exchanger, disclose a kind of quenching heat exchanger inlet connecting structure, this quenching heat exchanger inlet connecting structure includes inner tube, inlet cone, ceramic fiber paper and heat insulating part, one end of inlet cone is used to communicate with the outlet pipe of cracking furnace, other end and inner tube communicate, inlet cone is equipped with first heat insulation cavity, ceramic fiber paper covers on the inner wall of first heat insulation cavity, and ceramic fiber paper is enclosed in first heat insulation cavity and forms second heat insulation cavity, heat insulating part is filled in second heat insulation cavity, ceramic fiber paper can absorb the difference of the expansion amount of inlet cone and heat insulating part, avoid the problem that inlet cone extrudes heat insulating part.In addition, ceramic fiber paper has good heat insulation, can further improve the heat insulation effect of inlet cone.

Description

Technical Field

[0001] This utility model relates to the field of quench heat exchanger technology, and in particular to an inlet connection structure for a quench heat exchanger. Background Technology

[0002] The cracking furnace is a key unit of the ethylene plant. After the feedstock is cracked at high temperature in the furnace tubes, it enters the quench heat exchanger for rapid cooling to prevent secondary reactions, reduce olefin loss, and recover heat energy to generate steam.

[0003] Currently, the outlet pipe of the pyrolysis furnace is connected to the quench heat exchanger via an inlet cone. Since the temperature of the flowing material is typically around 800℃, insulation measures are required for the inlet cone. Existing technology usually involves filling the inlet cone with insulation material. However, because the insulation material and the inlet cone are made of different materials, their thermal expansion rates differ at high temperatures, making the insulation material prone to damage and thus reducing its insulation effectiveness.

[0004] Therefore, it is urgent to propose a quench heat exchanger inlet connection structure to solve the above-mentioned technical problems. Utility Model Content

[0005] The purpose of this utility model is to provide an inlet connection structure for a quench heat exchanger, which solves the technical problem that the thermal expansion of the insulation component and the inlet cone are different at high temperatures, causing the insulation component to be easily damaged, and can also improve the thermal insulation effect of the inlet cone.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] The inlet connection structure of the quench heat exchanger of this utility model includes an inner tube and an inlet cone 200. One end of the inlet cone 200 is connected to the outlet pipe of the pyrolysis furnace, and the other end is connected to the inner tube 100. Its characteristic is that...

[0008] The inlet cone 200 has a first heat insulation cavity on its side wall; the first heat insulation cavity is an annular cavity that is vertically arranged in its side wall, open at the top, and surrounds the side wall of the inlet cone; a layer of ceramic fiber paper 300 is covered on the inner wall of the first heat insulation cavity, and the ceramic fiber paper 300 surrounds the first heat insulation cavity to form a second heat insulation cavity; the second heat insulation cavity is filled with a heat insulation component 400;

[0009] The inlet connection structure of the quench heat exchanger also includes an outer tube 600, which is sleeved on the outside of the inner tube 100 and has a gap between it and the outer wall of the inner tube 100. The bottom inner wall of the outer tube 600 has a protrusion 610 corresponding to the bottom circumference of the inner tube. The protrusion 610 extends around the outer tube 600 in the circumferential direction and is connected end to end. The side of the protrusion 610 facing the axis of the outer tube 600 is connected to the outer wall of the inner tube 100, and the bottom of the protrusion 610 is sealed to the heat insulation member 400. The tube wall of the outer tube 600 extends downward from the bottom of the protrusion to connect with the outer sleeve 210 of the outer ring of the first heat insulation cavity.

[0010] The inner tube is inserted between the protrusion 610 and the inner sleeve 220 of the inner ring of the first heat insulation cavity, and its bottom is sealed to the tube wall step of the inner sleeve of the first heat insulation cavity and the heat insulation component 400.

[0011] In the aforementioned quench heat exchanger inlet connection structure, the outer sleeve 210 surrounds the outer side of the inner sleeve 220. The outer sleeve 210 includes a first end 211 and a second end 212, and the inner sleeve 220 includes a third end 221 and a fourth end 222. Along the circumference of the outer sleeve 210, the outer walls of the first end 211 and the third end 221 are integrally connected, and the second end 212 and the fourth end 222 are spaced apart to form the first heat insulation cavity between the outer sleeve 210 and the inner sleeve 220.

[0012] In the aforementioned quench heat exchanger inlet connection structure, along the circumference of the outer sleeve 210, the outer wall of the first end 211 and the third end 221 are provided with an arc surface 230 transition.

[0013] The quench heat exchanger inlet connection structure further includes a sealing ring 500. The outer wall of the fourth end 222 is provided with a sealing groove 2221, which is the tube wall step. The sealing groove 2221 extends circumferentially along the inner sleeve 220 and is connected end to end. One side wall of the sealing groove 2221 is provided with a notch. The notch extends circumferentially along the inner sleeve 220 and is connected end to end. The inner sleeve 220 is coaxial with the inner tube 100, and the fourth end 222 is inserted into the inner tube 100. The sealing ring 500 is sandwiched between the other side inner wall of the sealing groove 2221 and the inner tube 100.

[0014] The inlet connection structure of the quench heat exchanger is provided in which an opening 510 is provided on the outer wall of the sealing ring 500, and the opening 510 extends circumferentially along the sealing ring 500 and is connected end to end.

[0015] In the aforementioned quench heat exchanger inlet connection structure, the outer wall of the outer tube 600 is fixedly connected to the second end 212.

[0016] The quench heat exchanger inlet connection structure further includes a ceramic fiber rope 700 disposed on the insulation member. The ceramic fiber rope 700 is disposed along the circumference of the inner sleeve 220 and connected end to end. Along the radial direction of the outer tube 600, at least a portion of the ceramic fiber rope 700 is sandwiched between the protrusion 610 and the insulation member 400.

[0017] In the aforementioned quench heat exchanger inlet connection structure, a portion of the ceramic fiber rope 700 is sandwiched between the inner tube 100 and the heat insulation member 400.

[0018] The inlet connection structure of the quench heat exchanger, wherein a first expansion gap 810 is left between the outer wall of the fourth end 222 and the inner wall of the inner tube 100;

[0019] And / or, the inner tube 100 has a flared end 110 facing the fourth end 222, so that the fourth end 222 is inserted into the flared end 110, and a second expansion gap 820 is left between the end face of the fourth end 222 and the diameter change point of the flared end 110.

[0020] In the aforementioned quench heat exchanger inlet connection structure, the heat insulation element 400 is a non-metallic castable.

[0021] The beneficial effects of this utility model are:

[0022] The quench heat exchanger inlet connection structure provided by this utility model is equipped with ceramic fiber paper. The ceramic fiber paper covers the inner wall of the first insulation cavity of the inlet cone, and the ceramic fiber paper surrounds the first insulation cavity to form a second insulation cavity. The insulation component fills the second insulation cavity. When the high-temperature gas in the pyrolysis furnace enters the inner tube through the inlet cone, both the inlet cone and the insulation component expand due to heat. The ceramic fiber paper can absorb the difference in expansion between the inlet cone and the insulation component, avoiding the problem of compression between the insulation component and the inlet cone, and reducing the probability of damage to the insulation component. In addition, the ceramic fiber paper has good thermal insulation properties, which can further improve the thermal insulation effect of the inlet cone. In addition, the fourth end is inserted into the inner tube, and the sealing ring is clamped in the sealing groove to achieve a sealed connection between the inner sleeve and the inner tube. The sealing ring has an open structure to improve the sealing reliability of the sealing ring. The reserved radial and axial expansion space avoids mutual compression and collision between the two in the radial or axial direction when they expand thermally, improving the thermal insulation effect of the inlet cone. Attached Figure Description

[0023] Figure 1This is a cross-sectional schematic diagram of the inlet connection structure of the quench heat exchanger provided by this utility model;

[0024] Figure 2 yes Figure 1 Enlarged view of a portion of point A in the middle.

[0025] Explanation of the attached figures' numbers:

[0026] 100 Inner tube; 110 Flared end; 200 Inlet cone; 210 Outer tube; 211 First end; 212 Second end; 220 Inner sleeve; 221 Third end; 222 Fourth end; 2221 Sealing groove; 230 Arc surface; 300 Ceramic fiber paper; 400 Thermal insulation; 500 Sealing ring; 510 Opening; 600 Outer tube; 610 Protrusion; 700 Ceramic fiber rope; 810 First expansion gap; 820 Second expansion gap. Detailed Implementation

[0027] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0028] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0030] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0031] This embodiment provides an inlet connection structure for a quench heat exchanger, which can avoid the problem of the heat insulation component squeezing the inlet cone and the problem of gaps between the heat insulation component and the inner wall of the second heat insulation cavity, and can also improve the heat insulation effect of the inlet cone.

[0032] Specifically, such as Figure 1 As shown, the inlet connection structure of the quench heat exchanger of this utility model includes an inner tube 100, an inlet cone 200, ceramic fiber paper 300, and a heat insulation component 400. One end of the inlet cone 200 is used to communicate with the outlet pipe (not shown in the figure) of the pyrolysis furnace, and the other end is connected to the inner tube 100. The inlet cone 200 is provided with a first heat insulation cavity. The ceramic fiber paper 300 covers the inner wall of the first heat insulation cavity, and the ceramic fiber paper 300 surrounds the first heat insulation cavity to form a second heat insulation cavity. The heat insulation component 400 fills the second heat insulation cavity.

[0033] The quench heat exchanger inlet connection structure provided in this embodiment is equipped with ceramic fiber paper 300. The ceramic fiber paper 300 covers the inner wall of the first insulation cavity of the inlet cone 200, and the ceramic fiber paper 300 surrounds the first insulation cavity to form a second insulation cavity. The insulation element 400 fills the second insulation cavity. When the high-temperature gas in the pyrolysis furnace enters the inner tube 100 through the inlet cone 200, both the inlet cone 200 and the insulation element 400 expand due to heat. The ceramic fiber paper 300 can absorb the difference in expansion between the inlet cone 200 and the insulation element 400, avoiding the problem of compression between the insulation element 400 and the inlet cone 200, and reducing the probability of damage to the insulation element 400. In addition, the ceramic fiber paper 300 has good thermal insulation properties, which can further improve the thermal insulation effect of the inlet cone 200.

[0034] In this embodiment, the inlet cone 200 is made of heat-resistant steel, which gives it good high-temperature oxidation resistance.

[0035] Furthermore, the inlet cone 200 has an inner sleeve 220 and an outer sleeve 210 on the inner and outer walls of the first insulation cavity. The outer sleeve 210 is sleeved on the outside of the inner sleeve 220. The outer sleeve 210 includes a first end 211 and a second end 212. The inner sleeve 220 includes a third end 221 and a fourth end 222. Along the circumference of the outer sleeve 210, that is, the first insulation cavity is an annular cavity that extends circumferentially along the inlet cone 200 and is connected end to end, with the upper end open.

[0036] In this embodiment, both the first heat insulation cavity and the second heat insulation cavity are open-mouthed, and the openings 510 of the first heat insulation cavity and the second heat insulation cavity are both arranged facing the upper inner tube 100, so as to facilitate the placement of ceramic fiber paper 300 on the inner wall of the first heat insulation cavity and to facilitate the filling of heat insulation component 400 into the second heat insulation cavity.

[0037] Optionally, along the circumference of the outer sleeve 210, the outer walls of the first end 211 and the third end 221 are integrally connected by an arc surface 230. This structural design can increase the thickness at the connection position between the first end 211 and the third end 221, thereby improving the reliability of the connection between the first end 211 and the third end 221, and also reducing the connection difficulty between the first end 211 and the third end 221, thus improving production efficiency.

[0038] Optionally, such as Figure 1 and Figure 2 As shown, the inlet connection structure of the quench heat exchanger also includes a sealing ring 500. A stepped sealing groove 2221 is provided on the upper end of the outer wall of the fourth end 222. The sealing groove 2221 extends along the circumference of the inner sleeve 220 and is connected end to end. A notch is provided on one side wall of the sealing groove 2221. The notch extends along the circumference of the inner sleeve 220 and is connected end to end. The inner sleeve 220 is coaxial with the inner tube 100, and the fourth end 222 is inserted into the inner tube 100. The sealing ring 500 is sandwiched between the other side inner wall of the sealing groove 2221 and the bottom end of the inner tube 100, thereby realizing the sealed connection between the inner sleeve 220 and the inner tube 100.

[0039] In this embodiment, the sealing ring 500 is made of a metal material (e.g., heat-resistant steel) with good heat resistance properties to accommodate the high-temperature gas flowing in the inner sleeve 220 and the inner tube 100. At this time, the sealing ring 500 can play a good heat insulation role, reduce the heat transferred from the inner tube 100 to the fourth end 222, prevent the fourth end 222 from thermal deformation, and extend the service life of the inlet cone 200.

[0040] Furthermore, the outer wall of the sealing ring 500 is provided with an opening 510, which extends circumferentially along the sealing ring 500 and is connected end to end. The inner sleeve 220 and the inner tube 100 will both undergo thermal expansion under high temperature conditions, thereby compressing the sealing ring 500 in the axial direction. Providing an opening 510 on the outer wall of the sealing ring 500 helps the sealing ring 500 deform after being compressed, reducing the probability of the sealing ring 500 being crushed. Moreover, when the temperature of the inner sleeve 220 and the inner tube 100 decreases and they contract, the sealing ring 500 is no longer subjected to axial compression. The design of the opening 510 helps the sealing ring 500 to rebound, so that the sealing ring 500 always remains in a compressed state. It can be seen that the structural design of providing an opening 510 on the outer wall of the sealing ring 500 can improve the sealing reliability of the sealing ring 500.

[0041] Optionally, the inlet connection structure of the quench heat exchanger of this utility model also includes an outer tube 600, which is sleeved on the outside of the inner tube 100 and has a gap between it and the outer wall of the inner tube 100. The bottom end of the outer wall of the outer tube 600 is fixedly connected to the second end 212. The inner wall of the outer tube 600 is provided with a protrusion 610, which extends circumferentially along the outer tube 600 and is connected end to end. The side of the protrusion 610 facing the axis of the outer tube 600 is connected to the bottom outer wall of the inner tube 100, and the bottom end of the protrusion 610 is sealed to the heat insulation component 400. In practical applications, high-temperature pyrolysis gas flows between the inner sleeve 220 and the inner tube 100, and heat exchange medium (e.g., water) flows in the gap between the inner tube 100 and the outer tube 600. This structural design can ensure the normal flow of high-temperature heat exchange medium and also ensure the sealing between the outer tube 600 and the inlet cone 200, avoiding the problem of heat exchange medium overflow.

[0042] Furthermore, the outer wall of the outer tube 600 is welded and fixed to the end face of the second end 212 to achieve a fixed connection between the outer tube 600 and the outer sleeve 210.

[0043] Optionally, the inlet connection structure of the quench heat exchanger of this utility model also includes a ceramic fiber rope 700. The ceramic fiber rope 700 is arranged circumferentially along the inner sleeve 220 and connected end to end. Along the radial direction of the outer tube 600, at least a portion of the ceramic fiber rope 700 is sandwiched between the protrusion 610 and the heat insulation member 400 to achieve sealing and heat insulation between the protrusion 610 and the heat insulation member 400. In particular, it can prevent the heat insulation member 400 from being damaged by heat, thereby preventing the problem of local deformation of the inlet cone 200 caused by high temperature gas contacting the inlet cone 200. It has the effect of extending the service life of the inlet cone 200.

[0044] Furthermore, a portion of the ceramic fiber rope 700 is sandwiched between the inner tube 100 and the heat insulation component 400, further improving the sealing performance between the inner sleeve 220 and the inner tube 100.

[0045] Optionally, a first expansion gap 810 is left between the outer wall of the fourth end 222 and the inner wall of the inner tube 100. When the materials of the inner sleeve 220 and the inner tube 100 are different, their thermal expansion amounts are different under high temperature conditions. The design of the first expansion gap 810 provides radial expansion space for the inner sleeve 220 and the inner tube 100, avoiding problems such as mutual squeezing and collision in the radial direction when they thermally expand.

[0046] Furthermore, the inner tube 100 has a flared end 110 facing the fourth end 222, so that the fourth end 222 can be inserted into the flared end 110. A second expansion gap 820 is left between the end face of the fourth end 222 and the diameter change of the flared end 110. The design of the second expansion gap 820 provides axial expansion space for the inner sleeve 220 and the inner tube 100, avoiding problems such as mutual compression and collision in the axial direction when the two are thermally expanded.

[0047] Optionally, the heat insulation component 400 is a non-metallic castable, such as alumina castable. Liquid castable is poured into the second heat insulation cavity, and after the castable solidifies, a solid heat insulation component 400 is formed. Compared with filling the second heat insulation cavity with heat insulation component 400, the method of pouring liquid castable into the second heat insulation cavity is simpler and helps to reduce production difficulty and production cost.

[0048] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A quench heat exchanger inlet connection structure, comprising an inner tube and an inlet cone, wherein one end of the inlet cone (200) is connected to the outlet pipe of a pyrolysis furnace, and the other end is connected to the inner tube (100); characterized in that, The inlet cone (200) has a first heat insulation cavity on its side wall; the first heat insulation cavity is an annular cavity that is vertically arranged in its side wall, with an open upper part, and surrounds the side wall of the inlet cone. A layer of ceramic fiber paper (300) is covered on the inner wall of the first heat insulation cavity, and the ceramic fiber paper (300) surrounds the first heat insulation cavity to form a second heat insulation cavity; a heat insulation component (400) is filled in the second heat insulation cavity; The inlet connection structure of the quench heat exchanger also includes an outer tube (600), which is sleeved on the outside of the inner tube (100) and has a gap between it and the outer wall of the inner tube (100). The bottom inner wall of the outer tube (600) is provided with a protrusion (610) corresponding to the bottom circumference of the inner tube. The protrusion (610) extends around the outer tube (600) in the circumferential direction and is connected end to end. The side of the protrusion (610) facing the axis of the outer tube (600) is connected to the outer wall of the inner tube (100), and the bottom of the protrusion (610) is sealed to the heat insulation element (400). The tube wall of the outer tube (600) extends downward from the bottom of the protrusion to connect with the outer sleeve (210) of the outer ring of the first heat insulation cavity. The inner tube is inserted between the protrusion (610) and the inner sleeve (220) of the inner ring of the first heat insulation cavity, and its bottom is sealed to the tube wall step of the inner sleeve of the first heat insulation cavity and the heat insulation component (400).

2. The quench heat exchanger inlet connection structure according to claim 1, characterized in that, The outer sleeve (210) surrounds the outside of the inner sleeve (220). The outer sleeve (210) includes a first end (211) and a second end (212). The inner sleeve (220) includes a third end (221) and a fourth end (222). Along the circumference of the outer sleeve (210), the outer wall of the first end (211) and the third end (221) are integrally connected, and the second end (212) and the fourth end (222) are spaced apart to form the first heat insulation cavity between the outer sleeve (210) and the inner sleeve (220).

3. The quench heat exchanger inlet connection structure according to claim 2, characterized in that, The outer wall of the first end (211) and the third end (221) is set to transition with an arc surface (230).

4. The quench heat exchanger inlet connection structure according to claim 2, characterized in that, The inlet connection structure of the quench heat exchanger also includes a sealing ring (500). The outer wall of the fourth end (222) is provided with a sealing groove (2221), which is the tube wall step. The sealing groove (2221) extends along the circumference of the inner sleeve (220) and is connected end to end. One side wall of the sealing groove (2221) is provided with a notch. The notch extends along the circumference of the inner sleeve (220) and is connected end to end. The inner sleeve (220) is coaxial with the inner tube (100), and the fourth end (222) is inserted into the inner tube (100). The sealing ring (500) is sandwiched between the other side inner wall of the sealing groove (2221) and the inner tube (100).

5. The quench heat exchanger inlet connection structure according to claim 4, characterized in that, The sealing ring (500) has an opening (510) on its outer wall, and the opening (510) extends circumferentially along the sealing ring (500) and is connected end to end.

6. The quench heat exchanger inlet connection structure according to claim 2, characterized in that, The outer wall of the outer tube (600) is fixedly connected to the second end (212).

7. The quench heat exchanger inlet connection structure according to claim 6, characterized in that, The inlet connection structure of the quench heat exchanger also includes a ceramic fiber rope (700) disposed on the heat insulation component. The ceramic fiber rope (700) is disposed along the circumference of the inner sleeve (220) and connected end to end. Along the radial direction of the outer tube (600), at least a portion of the ceramic fiber rope (700) is sandwiched between the protrusion (610) and the heat insulation component (400).

8. The quench heat exchanger inlet connection structure according to claim 7, characterized in that, A portion of the ceramic fiber rope (700) is sandwiched between the inner tube (100) and the heat insulation component (400).

9. The quench heat exchanger inlet connection structure according to claim 4, characterized in that, A first expansion gap (810) is left between the outer wall of the fourth end (222) and the inner wall of the inner tube (100); And / or, the inner tube (100) has a flared end (110) facing the fourth end (222) so that the fourth end (222) is inserted into the flared end (110), and a second expansion gap (820) is left between the end face of the fourth end (222) and the diameter change of the flared end (110).

10. The quench heat exchanger inlet connection structure according to any one of claims 1-9, characterized in that, The heat insulation component (400) is a non-metallic castable.

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