Pyrolysis gas heat exchanger

Abstract

The embodiment of the invention relates to a pyrolysis gas heat exchanger which comprises a cone piece, a gas inlet pipe and a gas outlet pipe. The first connecting piece is connected to the outlet of the cone piece; the inner pipe is arranged between the first connecting piece and the second connecting piece, and the cone piece, the first connecting piece and the inner pipe are communicated; the outer pipe sleeves the inner pipe and is arranged between the first connecting piece and the second connecting piece; wherein an annulus is formed between the outer pipe and the inner pipe, the first connecting piece is provided with an input port used for inputting a low-temperature cooling medium, and the second connecting piece is provided with an output port used for outputting a high-temperature cooling medium subjected to heat exchange with a high-temperature fluid in the inner pipe; in the axis direction of the first connecting piece, the height of the joint of the first connecting piece and the inner pipe is larger than that of the joint of the first connecting piece and the outer pipe. Through the arrangement, on one hand, enough welding space is reserved for the inner pipe, so that welding operation is facilitated, welding difficulty is reduced, welding quality is improved, the service life of equipment is prolonged, equipment performance is improved, special welding equipment is not needed, and equipment cost is saved. And on the other hand, the distance between the welding position of the inner pipe and the cone piece is increased, the connecting position avoids the position where cold and hot fluid heat exchange is most intense, temperature difference stress at the connecting position is reduced, and reliability is improved. And on the other hand, the welding seam can be conveniently detected through nondestructive detection so as to be judged and guaranteed.

Description

Technical Field

[0001] This application relates to the technical field of pyrolysis gas heat exchange, and more particularly to a pyrolysis gas heat exchanger. Background Technology

[0002] In recent years, with the frequent commissioning of large-scale ethylene plants, cracked gas heat exchangers, a key component of these plants, have been widely used. Cracking gas heat exchangers can rapidly cool cracking products to a suitable temperature through efficient heat exchange, facilitating the recovery of heat from the high-temperature cracked gas, thereby improving production efficiency and reducing energy consumption. Simultaneously, the rapid cooling of the high-temperature products by the quench heat exchanger quickly terminates the cracking reaction, inhibiting the occurrence of secondary reactions. In conclusion, with continuous technological advancements and the development trend of reducing oil consumption and increasing chemical production in the petrochemical industry, the application of cracked gas heat exchangers in large-scale ethylene plants will become increasingly widespread, possessing a very broad application prospect.

[0003] The existing cracked gas heat exchangers are difficult to assemble, have low assembly efficiency, high assembly cost, and some parts have unreasonable structures, posing safety risks. They also require a lot of maintenance costs in the later operation. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0005] Therefore, the present invention provides a pyrolysis gas heat exchanger.

[0006] In view of this, a pyrolysis gas heat exchanger is proposed according to an embodiment of this application, comprising:

[0007] The conical component has an inlet for receiving high-temperature fluid.

[0008] A first connector and a second connector, wherein the first connector is connected to the outlet of the conical member;

[0009] An inner tube is disposed between the first connector and the second connector, and the conical component, the first connector, and the inner tube are connected.

[0010] An outer tube is fitted over the inner tube and positioned between the first connector and the second connector, wherein the first connector, the outer tube, and the second connector are connected.

[0011] An annular space is formed between the outer tube and the inner tube. The first connector is provided with an inlet for inputting a low-temperature cooling medium, and the second connector is provided with an outlet for outputting a high-temperature cooling medium that has exchanged heat with the high-temperature fluid in the inner tube.

[0012] Along the axial direction of the first connector, the height of the connection between the first connector and the inner tube is higher than the height of the connection between the first connector and the outer tube.

[0013] In one feasible implementation, the difference between the height of the connection between the first connector and the inner tube and the height of the connection between the first connector and the outer tube is greater than or equal to 10 mm.

[0014] In one feasible implementation, along the axial direction of the first connector, the wall thickness of the end of the first connector closer to the conical member is greater than the wall thickness of the end of the first connector closer to the inner tube.

[0015] A slope is formed between the end of the first connector near the conical member and the end of the first connector near the inner tube. Let the dimension of the slope in the axial direction of the first connector be L, and let the difference between the wall thickness of the end of the first connector near the conical member and the wall thickness of the end of the first connector near the inner tube be Y. Let L be greater than or equal to 3Y to 10Y.

[0016] The aforementioned slope and the transition point of the aforementioned first connector near the end of the aforementioned conical member are formed with a first rounded edge, the radius of the aforementioned first rounded edge being 5mm to 10mm;

[0017] The slope and the transition point of the first connector near the end of the inner tube are formed with a second rounded edge, the radius of which is 5mm to 10mm.

[0018] In one feasible implementation, the inner diameter of the conical member is the same as the inner diameter of the end of the first connector closest to the conical member.

[0019] In one feasible implementation, it further includes:

[0020] A heat insulation component is provided in a cavity between the inner and outer walls of the conical component.

[0021] In one feasible implementation, it further includes:

[0022] A sealing element is provided, wherein a first gap is formed between the inner wall of the conical member and the first connecting member, and the sealing element is disposed within the first gap;

[0023] Along the axial direction of the first connector, a second gap is formed between the conical member and the first connector, the size of the second gap being 5mm to 8mm;

[0024] The first connector has a boss at the location corresponding to the seal, the height of the boss being 2mm to 4mm, and the heat insulation extends beyond the bottom of the seal by an extension of 3mm or more.

[0025] In one feasible implementation, the end face of the conical member facing the first connector is formed with a third rounding.

[0026] The inner wall end face of the first connector facing the conical member has a fourth rounded edge.

[0027] In one feasible implementation, it further includes:

[0028] The first branch pipe has the inlet located on the side of the first connector and is connected to the inlet. The inner diameter of the first branch pipe is the same as the inner diameter of the inlet, and the wall thickness at the connection between the first branch pipe and the inlet is the same.

[0029] In one feasible implementation, it further includes:

[0030] The second branch pipe has the aforementioned output port located on the side of the second connector, and the second branch pipe is connected to the aforementioned output port.

[0031] In one feasible implementation, the inner wall of the end of the second branch pipe away from the first connector is flush with the inner wall of the end of the second connector away from the first connector corresponding to the output port, and the inner diameter of the second branch pipe is the same as the inner diameter of the output port, and the wall thickness at the connection between the second branch pipe and the output port is the same.

[0032] Compared to existing technologies, the present invention offers at least the following advantages: The pyrolysis gas heat exchanger provided in this application includes a conical component, a first connecting component, a second connecting component, an inner tube, and an outer tube. The conical component, the first connecting component, and the inner tube are interconnected to form a high-temperature fluid transport channel, through which the high-temperature fluid can be input. The first connecting component can be connected to the outlet of the conical component. Both the inner and outer tubes can be positioned between the first and second connecting components, with the outer tube fitted over the inner tube. An annular space is formed between the outer and inner tubes. An inlet can be provided at the first connecting component, and an outlet at the second connecting component. A low-temperature cooling medium is supplied to the annular space through the inlet. This low-temperature cooling medium can exchange heat with the high-temperature fluid transported in the transport channel, absorbing heat to rapidly reduce the fluid temperature. The high-temperature cooling medium after heat exchange can be discharged from the outlet. Through the flow of the cooling medium, heat exchange between the low-temperature cooling medium and the high-temperature fluid is consistently ensured, achieving a rapid cooling effect. Furthermore, along the axial direction of the first connecting component, the height of the connection between the first connecting component and the inner tube is higher than the height of the connection between the first connecting component and the outer tube. This design serves several purposes. First, it provides sufficient welding space for the inner tube, facilitating welding operations, reducing welding difficulty, improving weld quality, extending equipment lifespan, enhancing equipment performance, and eliminating the need for specialized welding equipment, thus saving costs. Second, increasing the distance between the welding position on the inner tube and the conical component ensures the connection avoids the area of ​​most intense heat exchange between hot and cold fluids, reducing thermal stress at the connection point and improving reliability. Third, it facilitates non-destructive testing of the weld seam for quality assurance. Attached Figure Description

[0033] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0034] Figure 1 A schematic structural diagram of a pyrolysis gas heat exchanger according to an embodiment of this application;

[0035] Figure 2 One of the enlarged partial views of a pyrolysis gas heat exchanger provided in this application;

[0036] Figure 3 A second partial enlarged view of a pyrolysis gas heat exchanger according to an embodiment of this application;

[0037] Figure 4 A third partial enlarged view of a pyrolysis gas heat exchanger according to an embodiment of this application;

[0038] Figure 5Fourth partial enlarged view of a pyrolysis gas heat exchanger according to an embodiment of this application.

[0039] in, Figures 1 to 5 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0040] 1. Conical component, 2. Insulation component, 3. Sealing component, 4. First connector, 5. Outer pipe, 6. Inner pipe, 7. Second connector, 8. Outlet pipe, 9. Second branch pipe, 10. First branch pipe, 11. Boss. Detailed Implementation

[0041] To better understand the above technical solutions, the technical solutions of the embodiments of this application will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments of this application and the specific features in the embodiments are detailed descriptions of the technical solutions of the embodiments of this application, rather than limitations on the technical solutions of this application. In the absence of conflict, the embodiments of this application and the technical features in the embodiments can be combined with each other.

[0042] like Figures 1 to 5 As shown in the figure, this application embodiment proposes a cracked gas heat exchanger, including: a cone-shaped component 1, the inlet of which is used to input high-temperature gas;

[0043] A first connector 4 and a second connector 7, wherein the first connector 4 is connected to the outlet of the conical member 1;

[0044] The inner tube 6 is disposed between the first connecting member 4 and the second connecting member 7, and the conical member 1, the first connecting member 4 and the inner tube 6 are connected.

[0045] The outer tube 5 is sleeved on the inner tube 6 and is disposed between the first connector 4 and the second connector 7. The first connector 4, the outer tube 5 and the second connector 7 are connected.

[0046] An annular space is formed between the outer tube 5 and the inner tube 6. The first connector 4 is provided with a liquid inlet for inputting low-temperature cooling medium. The second connector 7 is provided with a liquid outlet for outputting high-temperature cooling medium after heat exchange with the high-temperature gas in the inner tube 6.

[0047] Along the axial direction of the first connector 4, the height of the connection between the first connector 4 and the inner tube 6 is higher than the height of the connection between the first connector 4 and the outer tube 5.

[0048] It is understood that the pyrolysis gas heat exchanger provided in this application embodiment is provided with a conical component 1, a first connecting component 4, a second connecting component 7, an inner tube 6, and an outer tube 5. The conical component 1, the first connecting component 4, and the inner tube 6 are connected to form a high-temperature fluid transport channel, through which high-temperature fluid can be input. The first connecting component 4 can be connected to the outlet of the conical component 1. Both the inner tube 6 and the outer tube 5 can be disposed between the first connecting component 4 and the second connecting component 7, with the outer tube 5 sleeved over the inner tube 6. An annular space is formed between the outer tube 5 and the inner tube 6. An inlet can be provided at the first connecting component 4, and an outlet at the second connecting component 7. A low-temperature cooling medium is transported into the annular space through the inlet. The low-temperature cooling medium can exchange heat with the high-temperature fluid transported in the transport channel, absorbing heat to rapidly reduce the fluid temperature. The high-temperature cooling medium after heat exchange can be discharged from the outlet. Through the flow of the cooling medium, heat exchange between the low-temperature cooling medium and the high-temperature fluid is always ensured, achieving a rapid cooling effect. Furthermore, along the axial direction of the first connector 4, the height of the connection between the first connector 4 and the inner tube 6 is higher than the height of the connection between the first connector 4 and the outer tube 5. This arrangement provides sufficient welding space for the inner tube 6, facilitating welding operations, reducing welding difficulty, improving welding quality, thereby extending equipment lifespan, improving equipment performance, and eliminating the need for specialized welding equipment, thus saving equipment costs. On the other hand, increasing the distance between the welding position of the inner tube 6 and the conical component 1 ensures that the welding position of the inner tube 6 avoids the location of the most intense heat exchange between hot and cold fluids, reducing thermal stress at the welding position and improving reliability. Finally, it facilitates the inspection of the weld by non-destructive testing equipment to determine its reliability.

[0049] Understandably, the end of the second connector 7 furthest from the first connector 4 may be provided with an outlet pipe 8, which may be made of stainless steel, to facilitate the collection of cooled fluid. The fluid to be cooled may be gaseous, and the cooling medium may be coolant.

[0050] In some examples, such as Figure 1 As shown, the difference between the height of the connection between the first connector 4 and the inner tube 6 and the height of the connection between the first connector 4 and the outer tube 5 is greater than or equal to 10 mm.

[0051] It is understandable that the height difference between the connection point of the first connector 4 and the inner tube 6 and the connection point of the first connector 4 and the outer tube 5 is greater than or equal to 10mm. This is to ensure sufficient welding space for the inner tube 6, facilitating welding operations, reducing welding difficulty, improving welding quality, thereby extending equipment lifespan, improving equipment performance, and eliminating the need for specialized welding equipment, thus saving equipment costs. Furthermore, by increasing the distance between the welding position of the inner tube 6 and the conical component 1, the welding position of the inner tube 6 avoids the location of the most intense heat exchange between hot and cold fluids, reducing thermal stress at the welding position and improving reliability. Finally, sufficient space is provided for the use of non-destructive testing equipment, facilitating its inspection of the weld seam to ensure quality.

[0052] For example, the difference between the height of the connection between the first connector 4 and the inner tube 6 and the height of the connection between the first connector 4 and the outer tube 5 can be 100mm.

[0053] In some examples, such as Figure 3 As shown, along the axial direction of the first connector 4, the wall thickness of the end of the first connector 4 near the conical part 1 is greater than the wall thickness of the end of the first connector 4 near the inner tube 6.

[0054] A slope is formed between the end of the first connector 4 near the conical member 1 and the end of the first connector 4 near the inner tube 6. Let the dimension of the slope in the axial direction of the first connector 4 be L. Let the difference between the wall thickness of the end of the first connector 4 near the conical member 1 and the wall thickness of the end of the first connector 4 near the inner tube 6 be Y. Let L be greater than or equal to 3Y to 10Y.

[0055] The slope and the transition point of the first connector 4 near the end of the cone 1 are formed with a first rounded edge, the radius of which is 5mm to 10mm.

[0056] The slope and the transition point of the first connector 4 near the end of the inner tube 6 are formed with a second rounded edge, the radius of which is 5mm to 10mm.

[0057] It is understandable that, along the axial direction of the first connector 4, the wall thickness of the end of the first connector 4 near the conical component 1 is greater than the wall thickness of the end of the first connector 4 near the inner tube 6. At the point where the first connector 4 is near the conical component 1, it will be affected by the high-temperature gas phase. Increasing the wall thickness of the end of the first connector 4 near the conical component 1 can improve structural strength, thereby ensuring stability and reliability. Furthermore, the wall thickness of the end of the first connector 4 near the inner tube 6 is consistent with the wall thickness of the inner tube 6 to ensure equal thickness butt joints at the weld joint, resulting in lower welding stress and easier assurance of welding quality. Specifically, the change in the inner wall thickness of the first connector 4 can form a slope, and a first rounded edge can be formed at the transition between the slope and the end of the first connector 4 near the conical component 1, and a second rounded edge can be formed at the transition between the slope and the end of the first connector 4 near the inner tube 6. This ensures a smooth transition, reducing back-mixing of the gas phase at structural discontinuities, and thus reducing coking of the gas phase at structural discontinuities. A smooth transition can reduce stress concentration at structural discontinuities, improving equipment reliability and safety. The radius of both the first and second fillets can be 5mm to 10mm.

[0058] In some examples, such as Figure 2 As shown, the inner diameter of the conical component 1 is the same as the inner diameter of the end of the first connecting component 4 closest to the conical component 1.

[0059] Understandably, the inner diameter of the conical component 1 and the inner diameter of the end of the first connecting component 4 closest to the conical component 1 can be set to be the same, so that the gas phase can flow smoothly from the conical component 1 to the first connecting component 4, avoiding the generation of vortices. This reduces backmixing of the gas phase at structural discontinuities, thereby reducing coking of the gas phase at structural discontinuities.

[0060] In some examples, such as Figure 1 and Figure 2 As shown, the above-mentioned pyrolysis gas heat exchanger also includes:

[0061] The heat insulation component 2 is disposed in the cavity between the inner wall and the outer wall of the conical component 1.

[0062] It is understandable that the pyrolysis gas heat exchanger may also be equipped with a heat insulation component 2. Specifically, a cavity may be formed between the inner and outer diameters of the cone component 1 along the axial direction of the cone component 1. The heat insulation component 2 can be placed in the cavity. When a high-temperature gaseous medium is transported into the cone component 1, the high temperature can be isolated by the heat insulation component 2, reducing the impact of the high temperature on the outer wall of the cone component 1 and improving safety.

[0063] For example, the thermal insulation component may consist of a refractory layer and ceramic fiber paper.

[0064] In some examples, such as Figure 2 and Figure 4 As shown, the above-mentioned pyrolysis gas heat exchanger also includes:

[0065] A first gap is formed between the inner walls of the conical member 1 and the first connecting member 4, and the sealing member 3 is disposed in the first gap.

[0066] Along the axial direction of the first connector 4, a second gap is formed between the conical member 1 and the first connector 4, the size of the second gap being 5mm to 8mm; a boss is formed on the first connector 4 corresponding to the sealing member 3, the height of the boss being 2mm to 4mm; the heat insulation member 2 extends beyond the bottom of the sealing member 3, the extension being greater than or equal to 3mm.

[0067] It is understandable that the pyrolysis gas heat exchanger may also be equipped with a sealing element 3. Specifically, a first gap may be formed between the inner walls of the conical component 1 and the first connecting component 4. The first gap may include a circumferential expansion mounting gap between the conical component 1 and the first connecting component 4, as well as a height-direction expansion mounting gap between the conical component 1 and the first connecting component 4, to provide space for the conical component 1 and the first connecting component 4 to expand under the influence of high-temperature environment, thus maintaining structural stability. Furthermore, a sealing element 3 is provided in the first gap to protect the end of the first connecting component 4 near the conical component 1 from direct contact with the high-temperature gaseous medium, thereby preventing the first connecting component 4 from being eroded by the high-temperature gaseous medium and extending the service life of the first connecting component 4. The first connector 4 may have a boss 11 formed at the location corresponding to the seal 3. The boss 11 protrudes towards the seal 3 to press against the seal 3 and restrict the degree of freedom of the seal 3 in the height direction. The heat insulation 2 extends beyond the bottom of the seal 3 and restricts the degree of freedom of the seal 3 in the radial direction. Through the cooperation of the boss 11 and the heat insulation 2, the seal 3 is fixed in the set position to ensure the sealing effect.

[0068] For example, the seal 3 can be made of a high-temperature resistant material and asphalt paper. The high-temperature resistant material can fill the expansion joint in the height direction between the conical member 1 and the first connecting member 4. The asphalt paper can fill the circumferential expansion joint between the conical member 1 and the first connecting member 4. The asphalt paper melts at high temperatures and can completely fill the circumferential expansion joint, further improving the sealing performance in conjunction with the seal 3, thereby effectively preventing damage to the first connecting member 4 by the high-temperature gaseous medium. The high-temperature gaseous medium can be high-temperature pyrolysis gas.

[0069] It is understandable that a second gap can be formed between the end face of the conical member 1 and the end face of the first connector 4 along the axial direction of the first connector 4, serving as an axial expansion gap for the conical member 1 and the first connector 4. Under high temperature conditions, the conical member 1 expands, causing it to expand towards the first connector 4. Setting the second gap to 5mm to 8mm ensures that after the conical member 1 expands, the second gap shrinks to 0mm to 1mm, thereby filling the second gap and ensuring the structural continuity of the conical member 1 and the first connector 4.

[0070] In some examples, such as Figure 2 and Figure 4 As shown, the end face of the conical member 1 facing the first connector 4 has a third rounded edge; the inner wall end face of the first connector 4 facing one end of the conical member 1 has a fourth rounded edge.

[0071] It is understood that the end face of the conical member 1 facing the first connecting member 4 may have a third rounded edge, and the inner wall end face of the first connecting member 4 facing the conical member 1 may have a fourth rounded edge, and the third and fourth rounded edges may have the same size. This ensures a smooth transition of the end faces, avoids localized high stress concentration in the part of the first connecting member 4 near the conical member 1, and improves reliability. The radii of the third and fourth rounded edges can be determined based on the difference between the inner diameters of the first connecting member 4 and the conical member 1.

[0072] In some examples, such as Figure 2 As shown, the above-mentioned pyrolysis gas heat exchanger also includes:

[0073] The first branch pipe 10 has the aforementioned inlet located on the side of the first connector 4, and the first branch pipe 10 is connected to the aforementioned inlet.

[0074] It is understood that a first conveying cavity can be formed between the inner and outer walls of the first connector 4, and the first conveying cavity corresponds to the annulus. The inlet can be opened at the side wall of the first connector 4 and can be connected to the first conveying cavity. The inlet and the bottom of the first conveying cavity are flush. By setting the first branch pipe 10 to connect to the inlet, the cooling medium can be conveyed to the inlet and enter the first conveying cavity, and then enter the annulus. This arrangement facilitates the connection of the cooling medium source. Considering that the structural strength at the welding point is relatively weak, the first connector 4 and the inlet are made into an integral irregular part to improve the overall structural strength of the first connector 4. At the same time, the weld position is transferred from the stress concentration position to the stress-reducing position, making the weld position layout and stress more reasonable, improving the overall structural strength, improving stress, and improving reliability.

[0075] In some examples, such as Figure 5As shown, the above-mentioned cracked gas heat exchanger further includes: a second branch pipe 9, the above-mentioned output port is opened on the side of the above-mentioned second connector 7, the above-mentioned second branch pipe 9 is connected to the above-mentioned output port, and the wall thickness of the connection between the above-mentioned second branch pipe 9 and the above-mentioned output port is the same.

[0076] It is understood that a second conveying cavity can be formed between the inner and outer walls of the second connector 7, and the second conveying cavity corresponds to the annulus. The output port can be opened at the side wall of the second connector 7 and can be connected to the second conveying cavity. By setting the second branch pipe 9 to connect to the output port, the cooling medium that has been heated after heat exchange with the high-temperature gas phase can be discharged to the cooling medium recovery container through the annulus, the second conveying cavity, the output port, and the second branch pipe 9. This setting allows for flexible setting of the cooling medium container position and the size of the second branch pipe 9 according to the application scenario. Considering the relatively weak structural strength at the welding point, the second connector 7 and the output port are made into an integral irregular shape to improve the overall structural strength of the second connector 7. At the same time, the weld position is shifted from a stress concentration point to a less stressed point, making the weld position layout and stress distribution more reasonable, improving the overall structural strength, stress distribution, and reliability.

[0077] In some examples, such as Figure 5 As shown, the inner wall of the end of the second branch pipe 9 away from the first connector 4 is flush with the inner wall of the end of the second connector 7 away from the first connector 4 corresponding to the output port, and the inner diameter of the second branch pipe 9 is the same as the inner diameter of the output port of the second connector 7, and the wall thickness at the connection between the second branch pipe 9 and the output port of the second connector 7 is the same.

[0078] It is understandable that the inner wall of the end of the second branch pipe 9 furthest from the first connector 4 can be flush with the inner wall of the end of the second connector 7 corresponding to the outlet furthest from the first connector 4. That is, in Figure 5 As shown in the installation orientation, the upper edge of the inner wall of the second branch pipe 9 is flush with the upper edge of the inner wall of the outlet of the second connector 7, and the inner diameter of the second branch pipe 9 is the same as the inner diameter of the outlet of the second connector 7. The wall thickness at the connection between the second branch pipe 9 and the outlet of the second connector 7 is the same. This avoids flow dead zones and local overheating, ensures heat exchange efficiency, and improves the design reliability of the second connector 7.

[0079] In this invention, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "link" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0080] In the description of this invention, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or unit 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 invention.

[0081] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0082] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A pyrolysis gas heat exchanger, characterized in that, include: A conical component, the inlet of which is used to input high-temperature fluid; A first connector and a second connector, wherein the first connector is connected to the outlet of the conical component; An inner tube is disposed between the first connector and the second connector, and the conical component, the first connector, and the inner tube are connected in communication. An outer tube is fitted over the inner tube and positioned between the first connector and the second connector, wherein the first connector, the outer tube, and the second connector are connected. An annular space is formed between the outer tube and the inner tube. The first connector is provided with an inlet for inputting a low-temperature cooling medium, and the second connector is provided with an outlet for outputting a high-temperature cooling medium after heat exchange with the high-temperature fluid in the inner tube. Along the axial direction of the first connector, the height of the connection between the first connector and the inner tube is higher than the height of the connection between the first connector and the outer tube.

2. The pyrolysis gas heat exchanger according to claim 1, characterized in that, The difference between the height of the connection between the first connector and the inner tube and the height of the connection between the first connector and the outer tube is greater than or equal to 10 mm.

3. The pyrolysis gas heat exchanger according to claim 1, characterized in that, Along the axial direction of the first connector, the wall thickness of the end of the first connector closer to the conical member is greater than the wall thickness of the end of the first connector closer to the inner tube; A slope is formed between the end of the first connector near the conical member and the end of the first connector near the inner tube. Let the dimension of the slope in the axial direction of the first connector be L, and let the difference between the wall thickness of the end of the first connector near the conical member and the wall thickness of the end of the first connector near the inner tube be Y. L is greater than or equal to 3Y to 10Y. The slope and the transition point of the first connector near the end of the conical member are formed with a first rounded edge, the radius of which is 5mm to 10mm. The slope and the transition point of the first connector near the end of the inner tube are formed with a second rounded edge, the radius of which is 5mm to 10mm.

4. The pyrolysis gas heat exchanger according to claim 2, characterized in that, The inner diameter of the conical component is the same as the inner diameter of the end of the first connector closest to the conical component.

5. The pyrolysis gas heat exchanger according to claim 1, characterized in that, Also includes: A heat insulation component is provided, wherein a cavity is formed between the inner and outer walls of the conical component, and the heat insulation component is disposed within the cavity.

6. The pyrolysis gas heat exchanger according to claim 5, characterized in that, Also includes: A sealing element is provided, wherein a first gap is formed between the inner wall of the conical member and the first connecting member, and the sealing element is disposed within the first gap; Along the axial direction of the first connector, a second gap is formed between the conical member and the first connector, the size of the second gap being 5mm to 8mm; The first connector has a boss formed at the location corresponding to the seal, the height of the boss being 2mm to 4mm, and the heat insulation component extends beyond the bottom of the seal by an extension of 3mm or more.

7. The pyrolysis gas heat exchanger according to claim 1, characterized in that, The end face of the conical component facing the first connector has a third rounded edge; The inner wall end face of the first connector facing the conical member has a fourth rounded edge.

8. The pyrolysis gas heat exchanger according to claim 1, characterized in that, Also includes: The first branch pipe has an inlet located on the side of the first connector. The first branch pipe is connected to the inlet. The inner diameter of the first branch pipe is the same as the inner diameter of the inlet. The wall thickness at the connection between the first branch pipe and the inlet is the same.

9. The pyrolysis gas heat exchanger according to claim 1, characterized in that, Also includes: The second branch pipe has its output port located on the side of the second connector, and the second branch pipe is connected to the output port.

10. The pyrolysis gas heat exchanger according to claim 9, characterized in that, The inner wall of the second branch pipe at the end away from the first connector is flush with the inner wall of the second connector at the end away from the first connector corresponding to the output port, and the inner diameter of the second branch pipe is the same as the inner diameter of the output port, and the wall thickness at the connection between the second branch pipe and the output port is the same.

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