Furnace tube assembly and reaction furnace with same

Abstract

The furnace tube assembly comprises a furnace tube, the furnace tube is provided with a furnace tube body and a tube opening edge, the tube opening edge is connected with the furnace tube body in a welding mode, a welding seam surrounding a tube opening of the furnace tube is formed at the welding position of the tube opening edge and the furnace tube body, and the tube opening is formed in the outer end of the furnace tube; the furnace door mechanism is installed on the edge of the pipe opening and suitable for opening and closing the pipe opening, the radial middle of the furnace door mechanism extends into the furnace pipe, and the furnace door mechanism exceeds the welding seam towards the inner side of the furnace pipe in the axial direction of the furnace pipe. The furnace tube assembly at least has the advantages of being long in service life and the like.

Description

Technical Field

[0001] This utility model relates to the field of reactor technology, and in particular to a furnace tube assembly and a reactor having the same. Background Technology

[0002] In the relevant technology, the furnace tube assembly has a tube opening edge welded at the furnace opening, and the furnace door mechanism is located outside the weld. The heat inside the furnace is directly conducted to the weld without passing through the furnace door assembly. During rapid heating, the temperature at the weld is high, resulting in high thermal stress, which can easily lead to weld cracking. Utility Model Content

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, one objective of the present invention is to provide a furnace tube assembly that has advantages such as a longer service life.

[0004] This utility model also proposes a reactor with a furnace tube assembly.

[0005] To achieve the above objectives, an embodiment of the present invention provides a furnace tube assembly, comprising: a furnace tube having a furnace tube body and a tube opening edge, the tube opening edge being welded to the furnace tube body and forming a weld seam around the tube opening at the weld joint, the outer end of the furnace tube forming a tube opening; and a furnace door mechanism, the furnace door mechanism being installed on the tube opening edge and adapted to open and close the tube opening, the radial center of the furnace door mechanism extending into the furnace tube, and the furnace door mechanism extending axially beyond the weld seam inside the furnace tube.

[0006] According to the furnace tube assembly of this utility model, the weld is located on the side of the furnace tube axially adjacent to the furnace opening. Compared to the prior art where the weld is located on the side of the furnace tube axially away from the furnace opening, the furnace tube assembly of this utility model moves the welding point forward, making the welding point away from the combustion zone. This effectively reduces the high-temperature impact on the welding point, thereby reducing thermal stress caused by temperature differences, lowering the risk of cracking at the weld, and extending the service life of the furnace tube assembly. Simultaneously, the increased thickness of the furnace door mechanism, extending inward to the welding point, utilizes its excellent heat insulation properties to significantly reduce the temperature at the welding point. The high temperature resistance and oxidation resistance of quartz material help maintain the structural stability of the furnace tube assembly, reducing material fatigue and deformation caused by temperature changes.

[0007] In addition, good weld quality can improve the strength of the connection, ensure the structural integrity of the furnace tube, help the equipment operate safely in high-temperature environments, and improve the safety of the entire furnace tube assembly.

[0008] Therefore, the furnace tube assembly according to the present invention has the advantages of long service life, high stability and high safety.

[0009] According to some specific embodiments of this utility model, the distance by which the furnace door mechanism extends beyond the weld seam in the axial direction of the furnace tube is not less than 10mm.

[0010] According to some specific embodiments of the present invention, the furnace door mechanism includes: a door frame flange, which is installed on the pipe flange; and a furnace door body, which is closably installed on the door frame flange.

[0011] According to some specific embodiments of this utility model, the furnace door body includes: a metal door, which is closably installed on the door frame flange; a quartz door, which is installed on the inner side of the metal door, extending into the pipe opening and beyond the pipe opening edge and the weld seam inside the furnace tube, and a filling cavity is constructed on the side of the quartz door facing the metal door, which is closed by the metal door; and a heat-insulating filler, which fills the filling cavity with the heat-insulating surface.

[0012] According to some specific embodiments of the present invention, a protective cover plate is constructed on the side of the quartz door facing away from the metal door, and the protective cover plate is constructed in an annular shape and surrounds the radial outer side of the quartz door.

[0013] According to some specific embodiments of the present invention, the furnace door body further includes: a fixing claw, the middle part of which is installed on the side of the metal door facing the quartz door, and the outer peripheral side of the fixing claw is constructed with a locking edge arranged circumferentially, the locking edge extending toward the quartz door, and the inner peripheral surface of the quartz door is constructed with a locking groove that cooperates with the locking edge and extends circumferentially, the locking edge extending into the locking groove and engaging with the locking groove axially.

[0014] According to some specific embodiments of this utility model, the number of the card edges is greater than or equal to 5.

[0015] According to some specific embodiments of this utility model, the side of the fixing claw facing the quartz door stops the heat insulation filler, and the heat insulation filler is clamped between the fixing claw and the end face of the quartz door along the thickness direction.

[0016] According to some specific embodiments of the present invention, the outer peripheral side of the quartz door away from the metal door is provided with a ring edge, and the ring edge is spaced from the inner peripheral surface of the furnace tube body at all points along the circumference.

[0017] The distance between the ring edge and the furnace tube is 3mm to 5mm.

[0018] According to some specific embodiments of this utility model, the outer peripheral side of the quartz door, the door frame flange and the inner peripheral side of the furnace tube, and the metal door together define a corrosion-resistant cavity.

[0019] According to some specific embodiments of this utility model, the pipe opening edge includes: a transition portion, which is connected to the furnace tube body and welded to the furnace tube body, and the wall thickness of the transition portion gradually increases axially away from the furnace tube body; and a pipe opening flange portion, which is connected to the outer periphery of the transition portion and extends radially outward; wherein, the maximum wall thickness of the transition portion is 9mm~11mm.

[0020] According to an embodiment of the second aspect of the present invention, a reactor is provided, including a furnace tube assembly according to the above embodiment of the present invention.

[0021] The reactor according to the present invention, by utilizing the furnace tube assembly of the above embodiment, has at least the advantage of a longer service life.

[0022] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0023] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0024] Figure 1 This is a schematic diagram of the furnace tube assembly according to an embodiment of the present invention;

[0025] Figure 2 yes Figure 1 A partial schematic diagram;

[0026] Figure 3 This is a schematic diagram of the furnace door body of the furnace tube assembly according to an embodiment of the present utility model;

[0027] Figure 4 This is a schematic diagram of the quartz door of the furnace tube assembly according to an embodiment of the present invention.

[0028] Figure label:

[0029] Furnace tube assembly 1, furnace tube 100, furnace door mechanism 200, fixing claw 300

[0030] Furnace tube body 110, tube end 120, weld 101, transition section 121, tube end flange 122.

[0031] Door frame flange 210, furnace door body 220, metal door 221, quartz door 222, thermal insulation filler 223

[0032] Protective cover plate 201, circumferential edge 202, retaining edge 301. Detailed Implementation

[0033] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0034] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0035] In the description of this utility model, "first feature" and "second feature" may include one or more of the features.

[0036] In the description of this utility model, "multiple" means two or more, and "several" means one or more.

[0037] The furnace tube assembly 1 according to an embodiment of the present invention is described below with reference to the accompanying drawings.

[0038] like Figures 1-4 As shown, the furnace tube assembly 1 according to an embodiment of the present invention includes a furnace tube 100 and a furnace door mechanism 200.

[0039] The furnace tube 100 has a furnace tube body 110 and a tube opening edge 120. The tube opening edge 120 is welded to the furnace tube body 110, and a weld 101 is formed at the weld joint surrounding the tube opening of the furnace tube 100. The outer end of the furnace tube 100 forms a tube opening. A furnace door mechanism 200 is installed on the tube opening edge 120 and is adapted to open and close the tube opening. The radial center of the furnace door mechanism 200 extends into the furnace tube 100, and the furnace door mechanism 200 extends axially beyond the weld 101 inside the furnace tube 100.

[0040] For example, the furnace tube body 110 and the tube edge 120 are welded together. The tube edge 120 and the furnace tube body 110 are both welded using the same material. For example, the tube edge 120 and the furnace tube body 110 are both made of transparent quartz material. Thus, the expansion system of the tube edge 120 and the furnace tube body 110 is also the same. Compared with transparent quartz material, the welding reliability is higher when it is welded to milky white quartz.

[0041] According to the furnace tube assembly 1 of this utility model embodiment, the furnace door mechanism 200 extends beyond the weld 101 axially inside the furnace tube 100. Compared with the prior art where the weld 101 is on the side of the furnace tube axially away from the furnace opening, the furnace tube assembly 1 of this utility model brings the weld 101 closer to the furnace opening, so that the weld 101 is away from the high temperature zone and the temperature at the weld 101 is lower than the temperature of the high temperature zone. This can reduce the thermal stress caused by the temperature difference, thereby reducing the risk of cracking at the weld and extending the service life of the furnace tube assembly 1.

[0042] Meanwhile, the inventors also discovered that in the prior art, the weld seam is located in the high-temperature zone inside the furnace when the furnace door mechanism is closed, resulting in a high weld seam temperature. However, when the furnace door mechanism is opened, the furnace interior and external environment become interconnected, causing the weld seam temperature to drop rapidly, thus creating a significant temperature difference and increasing stress at the weld seam. Therefore, when the furnace tube assembly 1 of this invention brings the weld seam 101 closer to the furnace opening, the temperature of the weld seam 101 remains relatively stable when the furnace door mechanism 200 is opened and closed, preventing a large temperature difference. This reduces the stress received at the weld seam and lowers the risk of cracking at the weld.

[0043] Furthermore, by reducing the heat resistance requirements at the furnace opening, the same materials can be used for welding, thus improving the welding reliability of the furnace tube materials. Simultaneously, the increased thickness of the furnace door mechanism 200, extending inwards to the welding point, utilizes its excellent thermal insulation properties to significantly reduce the temperature at the weld. The high temperature resistance and oxidation resistance of quartz material help maintain the structural stability of the furnace tube assembly 1, reducing material fatigue and deformation caused by temperature changes.

[0044] In addition, good weld quality 101 can improve the strength of the connection, ensure the structural integrity of the furnace tube 100, help the equipment to operate safely in high-temperature environments, and improve the safety of the entire furnace tube assembly 1.

[0045] Therefore, the furnace tube assembly 1 according to the present invention has the advantages of long service life, high stability and high safety.

[0046] In some specific embodiments of this utility model, the furnace door mechanism 200 extends beyond the weld 101 in the axial direction of the furnace tube by a distance of not less than 10mm. This sufficient distance beyond the weld 101 prevents the weld 101 area from being directly exposed to high-temperature scorching and wear during use, thereby extending the service life of the weld 101 and improving the overall durability of the furnace tube assembly 1.

[0047] In some specific embodiments of this utility model, such as Figure 2 As shown, the furnace door mechanism 200 includes a door frame flange 210 and a furnace door body 220. The door frame flange 210 is installed on the pipe flange portion 122. The furnace door body 220 is closably installed on the door frame flange 210.

[0048] The connection between the door frame flange 210 and the pipe flange 122 provides excellent sealing performance, preventing gas leakage from the furnace and external contaminants from entering the furnace tube 100. This is crucial for maintaining the stability of the furnace atmosphere and improving thermal efficiency. The openable and closable furnace door body 220 structure allows operators to easily perform necessary work on the materials inside the furnace, and this flexibility improves work efficiency.

[0049] In some specific embodiments of this utility model, such as Figure 3 As shown, the furnace door body 220 includes a metal door 221, a quartz door 222, and an insulating filler 223. The metal door 221 is closable and mounted on the door frame flange 210. The quartz door 222 is mounted inside the metal door 221, extending into the tube opening and protruding beyond the weld seam in the axial direction of the furnace tube 100. A filling cavity is constructed on the side of the quartz door 222 facing the metal door 221, and the metal door 221 closes the filling cavity. The insulating filler 223 fills the filling cavity.

[0050] For example, the insulation filler 223 is made of alumina fiber insulation cotton. The insulation filler 223 is housed inside the quartz door 222 and sealed off the outside of the furnace opening by the metal door 221, ensuring good insulation performance. For example, the metal door 221 can be constructed using a combination of 6061 aluminum alloy and Hastelloy alloy, effectively preventing corrosion of the furnace door body 220 by process gases and reactants during boron diffusion and oxidation processes, thus extending the service life of the furnace tube assembly 1. Filling the space between the metal door 221 and the quartz door 222 with the insulation filler 223 ensures a slight positive pressure inside the furnace door body 220, preventing process gases from seeping into the furnace door body 220, further ensuring the furnace door body 220 is not corroded and extending its service life. Adding the insulation filler 223 to the furnace opening body 220 area, utilizing the inert gas properties of the insulation filler 223, further ensures the furnace opening body 220 area is not corroded.

[0051] In some specific embodiments of this utility model, such as Figure 4 As shown, a protective cover plate 201 is constructed on the side of the quartz door 222 that is away from the metal door 221. The protective cover plate 201 is constructed in an annular shape and surrounds the radial outer side of the quartz door 222.

[0052] For example, the protective cover 201 is made of alloy and can isolate the process gas from contact with the quartz door 222, thereby reducing corrosion of the quartz door 222. This solves the problem of short lifespan caused by long-term corrosion of the furnace door body 220 by process gas, and extends the service life of the furnace door body 220. In addition, the annular structure of the protective cover 201 can help block some heat radiation, reducing the dissipation of high temperature from the inside of the furnace door body 220, thereby improving thermal efficiency and maintaining a stable internal temperature of the furnace door body 220. This is particularly important for reducing energy loss and improving heating efficiency.

[0053] In some specific embodiments of this utility model, such as Figure 3 As shown, the furnace door body 220 also includes a fixing claw 300. The middle part of the fixing claw 300 is installed on the side of the metal door 221 facing the quartz door, and the outer peripheral side of the fixing claw 300 is constructed with locking edges 301 arranged circumferentially. The locking edges 301 extend toward the quartz door 222, and the inner peripheral surface of the quartz door 222 is constructed with a locking groove that cooperates with the locking edges 301 and extends circumferentially. The locking edges 301 enter the locking groove and engage with the locking groove axially.

[0054] Furthermore, the number of retaining edges 301 is greater than or equal to five. For example, constructing seven retaining edges 301 can further disperse the force, reducing the maximum stress at the stress concentration point from 4.1 MPa to 1.4 MPa (a reduction of 31.7%), and the maximum deformation from 1.53 mm to 1.30 mm (a reduction of over 13%). This achieves the goal of reducing mechanical damage. Increasing the number of retaining edges 301 improves the support stability between the quartz door 222 and the fixing claw 300. More retaining edges 301 can evenly distribute the force, reducing deformation or damage caused by excessive pressure on a single retaining edge 301, and improving the fixing stability of the quartz door 222. In addition, more retaining edges 301 can effectively disperse the force between the quartz door 222 and the retaining groove, reducing local stress concentration, thereby reducing the risk of fatigue failure of the structural materials under high-temperature environments and improving the reliability and durability of the entire system.

[0055] In some specific embodiments of this utility model, such as Figure 3As shown, the side of the fixing claw 300 facing the quartz door 222 is stopped by the heat insulation filler 223, which is clamped between the fixing claw 300 and the end face of the quartz door 222 along its thickness direction. By filling the quartz door 222 with the heat insulation filler 223, and by stopping the fixing claw 300 against the heat insulation filler 223, the maximum equivalent stress between the quartz door 222 and the fixing claw 300 is reduced from 4.2 MPa to 2.2 MPa, a reduction of 47.6%. The heat insulation filler 223, clamped between the fixing claw 300 and the quartz door 222, helps to provide additional support for the structure and improve overall stability. This structure can reduce the impact of mechanical vibration on the quartz door 222, reducing the risk of loosening or damage caused by vibration.

[0056] In some specific embodiments of this utility model, such as Figure 3 and Figure 4 As shown, the outer peripheral side of the quartz door 222 away from the metal door 221 has a ring edge 202, which is spaced from the inner peripheral surface of the furnace tube body 110 at all points along the circumference.

[0057] In some embodiments, such as Figure 2 As shown, the circumferential edge 202 extends axially beyond the weld 101 into the furnace tube 100. The circumferential edge 202 forms only a small gap with the inner circumference of the furnace tube 100, which plays a certain role in heat insulation.

[0058] The distance between the circumference 202 and the furnace tube 100 is 3mm to 5mm. Figure 2 The letter B indicates the spacing. The furnace tube 100 and quartz door 222 undergo thermal expansion at high temperatures. By setting a certain gap, space can be provided for material expansion, avoiding stress concentration and structural deformation caused by thermal expansion, thus protecting the furnace tube 100 and quartz door 222 from damage. Because quartz and metal have different coefficients of thermal expansion, without sufficient gap, thermal stress may occur during temperature changes, leading to material fatigue or even damage. The presence of a gap can reduce this thermal stress and extend the service life of the quartz door 222 and furnace tube 100.

[0059] In some specific embodiments of this utility model, the outer periphery of the quartz door 222, the door frame flange 210 and the inner periphery of the furnace tube 100, and the metal door 221 together define a corrosion-resistant cavity.

[0060] The presence of the corrosion-resistant cavity effectively isolates corrosive gases or liquids from chemicals that come into direct contact with the materials of furnace tube 100 and quartz door 222, slowing down or preventing corrosion and thus extending the service life of the equipment and reducing maintenance and replacement frequency. The corrosion-resistant cavity's structure also effectively protects critical components of quartz door 222, metal door 221, and furnace tube 100 from direct exposure to harsh operating conditions, preventing damage from corrosive media and ensuring the overall stability and safety of the equipment. Furthermore, the corrosion-resistant cavity provides a degree of temperature isolation, reducing the direct impact of high-temperature gases on metal door 221 and quartz door 222, helping to control the internal temperature distribution of the equipment and improving overall welding performance.

[0061] In some specific embodiments of this utility model, such as Figure 2 As shown, the nozzle 120 includes a transition portion 121 and a nozzle flange portion 122. The transition portion 121 is connected to the furnace tube body 110 and welded to the furnace tube 100. The wall thickness of the transition portion 121 gradually increases axially away from the furnace tube body 110. The nozzle flange portion 122 is connected to the outer periphery of the transition portion 121 and extends radially outward. The maximum wall thickness of the transition portion 121 is 9mm to 11mm. Figure 2 In the middle, A represents the maximum wall thickness of the transition section 121.

[0062] The wall thickness of the transition section 121 gradually increases, which effectively improves the load-bearing capacity of the furnace tube 100 under high temperature, high pressure or other extreme conditions. The increased thickness can prevent deformation or cracking of the furnace tube assembly 1 during operation, ensuring the safety and reliability of the overall structure. At the same time, by controlling the maximum wall thickness of the transition section 121 to 9mm~11mm, the cracking between the furnace tube body 110 and the transition section 121 can be reduced by strengthening its own thickness, increasing the structural strength and rigidity at the tube end 120, and reducing the failure rate of the weld 101.

[0063] The following describes a reactor according to an embodiment of the present invention.

[0064] The reactor according to an embodiment of the present invention includes a furnace tube assembly 1 according to the above embodiment of the present invention.

[0065] The reactor according to the above embodiments of the present invention, by utilizing the furnace tube assembly 1 according to the embodiments of the present invention, has the advantages of long service life, high stability and high safety.

[0066] Other configurations and operations according to the embodiments of this utility model are known to those skilled in the art and will not be described in detail here.

[0067] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are 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.

[0068] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A furnace tube assembly characterized by, The furnace tube assembly comprises: a furnace tube having a furnace tube body and a tube mouth rim, the tube mouth rim being welded to the furnace tube body and forming a weld around a tube mouth of the furnace tube, an outer end of the furnace tube forming the tube mouth; a furnace door mechanism mounted to the tube mouth rim and adapted to open and close the tube mouth, a radial middle portion of the furnace door mechanism extending into the furnace tube, the furnace door mechanism extending beyond the weld to an inside of the furnace tube in an axial direction of the furnace tube.

2. The furnace tube assembly of claim 1, wherein, The furnace door mechanism extends beyond the weld to the inside of the furnace tube in the axial direction of the furnace tube by a distance of no less than 10 mm.

3. The furnace tube assembly of claim 1, wherein, The furnace door mechanism comprises: a door frame flange mounted to the tube mouth of the furnace tube; a furnace door body mounted to the door frame flange in an openable and closable manner.

4. The furnace tube assembly of claim 3, wherein, The furnace door body comprises: a metal door mounted to the door frame flange in an openable and closable manner; a quartz door mounted to an inside of the metal door, the quartz door extending into the tube mouth and beyond the tube mouth rim and the weld to the inside of the furnace tube in the axial direction of the furnace tube, a side of the quartz door facing the metal door being configured with a filling cavity, the metal door closing the filling cavity; a heat insulation filling body filled in the filling cavity.

5. The furnace tube assembly of claim 4, wherein, A side of the quartz door facing away from the metal door is configured with a protective cover plate, the protective cover plate being configured in an annular shape and surrounding a radial outside of the quartz door.

6. The furnace tube assembly of claim 4, wherein, The furnace door body further comprises: a fixed clamping jaw having a middle portion mounted to the side of the metal door facing the quartz door, and an outer peripheral side of the fixed clamping jaw being configured with clamping rims arranged at intervals in a circumferential direction, the clamping rims extending in a direction of the quartz door, an inner peripheral surface of the quartz door being configured with clamping grooves matched with the clamping rims, the clamping rims extending into the clamping grooves and being clamped with the clamping grooves.

7. The furnace tube assembly of claim 6, wherein, A number of the clamping rims is no less than 5.

8. The furnace tube assembly of claim 6, wherein, The side of the fixed clamping jaw facing the quartz door is stopped by the heat insulation filling body, the heat insulation filling body being clamped between the fixed clamping jaw and an end surface of the quartz door in a thickness direction.

9. The fire tube assembly of claim 4, wherein, An outer peripheral side of the quartz door away from the metal door is configured with a ring rim, the ring rim being spaced apart from an inner peripheral surface of the furnace tube body everywhere in the circumferential direction; wherein a spacing distance between the ring rim and the furnace tube is 3 mm to 5 mm.

10. The fire tube assembly of claim 4, wherein, The outer peripheral side of the quartz door, the door frame flange, the inner peripheral side of the furnace tube, and the metal door together define a corrosion-resistant cavity.

11. The fire tube assembly of claim 1, wherein The tube mouth rim comprises: a transition portion connected to the furnace tube body and welded to the furnace tube body, a wall thickness of the transition portion gradually increasing in the axial direction away from the furnace tube body; a tube mouth flange portion connected to an outer peripheral side of the transition portion and extending to a radial outside; wherein a maximum wall thickness of the transition portion is 9 mm to 11 mm.

12. A reactor furnace characterized by, The furnace tube assembly comprises: any one of claims 1-11.

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