A heating furnace tube having a stress dispersion structure

Abstract

The utility model provides a heating furnace pipe with stress dispersion structure, include: heating furnace pipe subassembly, heating furnace pipe subassembly including heating furnace pipe body, expansion joint and composite thermal barrier coating, compare with prior art, the utility model has the following beneficial effect: through increase heating furnace pipe subassembly and support subassembly, prevent the mechanical stress of thermal difference stress and gravity that heating furnace pipe of parallelly connected arrangement prevents long section furnace pipe causes, and improve the performance of pipe fitting through composite thermal barrier coating, and release stress when the expansion of heating furnace pipe through slow -release gasket, can realize stress dispersion and improve the service life, through increase heating furnace pipe subassembly, support subassembly and upper support subassembly, lower support seat and upper support seat sleeve joint card hold to heating furnace pipe body, and through the installation of the embedded slow -release gasket of pressure holding column and pressure holding groove, and use bolt to connect and fix lower support seat and upper support seat, can assist heating furnace pipe use.

Description

Technical Field

[0001] This utility model belongs to the technical field of heating equipment, and specifically relates to a heating furnace tube with a stress dispersion structure. Background Technology

[0002] Heating furnace tubes are the core functional components of industrial heating furnaces. Their main function is to transport the medium to be heated (such as crude oil, oil and gas, chemical raw materials, etc.) within the furnace and heat it to the required process temperature using the heat generated by fuel combustion (or electric heating) within the furnace. They must withstand harsh conditions such as high temperature, high pressure, and corrosion from the medium. The materials used are typically high-temperature, high-pressure, creep-resistant, and corrosion-resistant alloy steels (such as Cr-Mo steel, austenitic stainless steel, heat-resistant steel, etc.). In some extreme cases, ceramic or alloy coatings are used to enhance performance. The stress that heating furnace tubes bear during operation is the result of multiple factors, such as thermal stress and mechanical stress. Thermal stress is caused by uneven temperature distribution or drastic temperature changes in different parts of the furnace tube. The furnace tubes are mutually constrained due to differences in the rate of thermal expansion and contraction, which in turn forms internal stress. Mechanical stress is generated by the weight of the furnace tube itself, the pressure of the medium, and the constraints of external supports. Existing heating furnace tubes mostly adopt a uniform wall thickness design and a standard straight tube structure, which are prone to significant thermal stress concentration under high temperature conditions. In terms of materials, traditional heating furnace tubes are often manufactured using static casting methods, which have problems such as coarse grains and low allowable stress. The generation of stress will affect the service life of the heating furnace tubes.

[0003] In summary, we hope to propose a new structure to solve the aforementioned technical problems. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a heating furnace tube with a stress dispersion structure to solve the problems mentioned in the background art.

[0005] This utility model is achieved through the following technical solution: a heating furnace tube with a stress dispersion structure, comprising: a heating furnace tube assembly, wherein the heating furnace tube assembly includes a heating furnace tube body, an expansion joint and a composite thermal barrier coating; The heating furnace tube bodies are arranged in parallel in several groups. Each group of heating furnace tube bodies is composed of several sections. An expansion joint for adjusting and relieving stress is fixedly connected between adjacent ends of the heating furnace tube bodies. Each section of the heating furnace tube body is fixedly connected to several sets of support components for support. The support components include a lower support seat and a slow-release gasket. The inner wall of the lower support seat is equipped with a slow-release gasket for slowing down the expansion stress of the heating furnace tube body.

[0006] In a preferred embodiment, a connecting flange is fixedly connected to the connection between the heating furnace tube body and the expansion joint. The expansion joint is a metal bellows expansion joint. The composite thermal barrier coating includes an adhesive layer, a ceramic layer, and a sealing layer. An expansion joint is installed between two adjacent sets of heating furnace tube bodies to compensate for the expansion and contraction of the heating furnace tube body.

[0007] In a preferred embodiment, the adhesive layer is a NiCrAlY high-temperature coating, and the ceramic layer is made of yttrium-stabilized zirconium oxide material.

[0008] In a preferred embodiment, the heating furnace tube body is manufactured by centrifugal casting. The chromium content of the heating furnace tube body gradually increases and the molybdenum content gradually decreases from the inner wall to the outer wall. The composition gradient design gives the inner wall excellent corrosion resistance and the outer wall higher high-temperature strength.

[0009] In a preferred embodiment, a spiral structure inner wall support is fixedly connected to the inner wall of the heating furnace tube body, and the slow-release gasket is made of graphite material, which slowly releases the heat by supporting and limiting the heating furnace tube body.

[0010] In a preferred embodiment, a support column is fixedly connected below the lower support, and the support column is fixedly connected to the heating furnace below.

[0011] In a preferred embodiment, a set of lower connecting plates is fixedly connected to both the front and rear ends of the lower support seat, and an upper support assembly is fixedly connected above the lower support seat, the upper support assembly including an upper support seat.

[0012] In a preferred embodiment, a set of upper connecting plates is fixedly connected to both the front and rear ends of the upper support seat, and two sets of pressure-holding columns are fixedly connected to both the front and rear ends of the inner side of the upper support seat. A pressure-holding groove is opened on the outer side of the slow-release gasket. The pressure-holding columns and pressure-holding grooves are interlocked with each other. The lower support seat and the upper support seat are sleeved and clamped to the heating furnace tube body, and the installation of the slow-release gasket is pressed and held by the interlocking of the pressure-holding columns and pressure-holding grooves. The lower support seat and the upper support seat are connected and fixed with bolts, which can assist in the use of the heating furnace tube.

[0013] After adopting the above technical solution, the beneficial effects of this utility model are: By adding heating furnace tube assemblies and support assemblies, the parallel arrangement of heating furnace tubes prevents thermal differential stress caused by long furnace tubes and mechanical stress caused by gravity. The performance of the tubes is improved by a composite thermal barrier coating, and stress is relieved by a slow-release gasket when the heating furnace tubes expand, thereby achieving stress dispersion and improving service life.

[0014] By adding heating furnace tube assembly, support assembly and upper support assembly, the lower support seat and the upper support seat are sleeved and clamped to the heating furnace tube body, and the installation of the pressure-relieving gasket is supported by the fitting of the pressure-holding column and the pressure-holding groove, and the lower support seat and the upper support seat are connected and fixed with bolts, which can assist the use of heating furnace tube. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of a heating furnace tube with a stress dispersion structure according to the present invention.

[0017] Figure 2 This is a schematic diagram of the structure of a heating furnace tube assembly with a stress dispersion structure according to the present invention.

[0018] Figure 3 This is a cross-sectional schematic diagram of a heating furnace tube assembly with a stress dispersion structure according to the present invention.

[0019] Figure 4 for Figure 3 Enlarged view of point A in the middle.

[0020] Figure 5 This is a schematic diagram of the structure of a support component in a heating furnace tube with a stress dispersion structure according to the present invention.

[0021] Figure 6 This is a schematic diagram of the upper support assembly in a heating furnace tube with a stress dispersion structure according to the present invention.

[0022] In the figure, 100-heating furnace tube assembly, 101-heating furnace tube body, 102-connecting flange, 103-expansion joint, 104-inner wall support, 105-composite thermal barrier coating; Support component, 201-support column, 202-lower support seat, 203-lower connecting plate, 204-slow-release gasket, 205-pressure groove; 300-Upper support assembly, 301-Upper support seat, 302-Upper connecting plate, 303-Pressure support column; 105a - Adhesive layer, 105b - Ceramic layer, 105c - Sealing layer. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figures 1-5 As the first embodiment of this utility model: A heating furnace tube with a stress dispersion structure includes: a heating furnace tube assembly 100, wherein the heating furnace tube assembly 100 includes a heating furnace tube body 101, an expansion joint 103 and a composite thermal barrier coating 105; The heating furnace tube body 101 is arranged in parallel in several groups. Each group of heating furnace tube body 101 is composed of several sections. An expansion joint 103 for adjusting and relieving stress is fixedly connected between adjacent heating furnace tube bodies 101. Each section of the heating furnace tube body 101 is fixedly connected to several sets of support components 200 for support. The support components 200 include a lower support seat 202 and a slow-release gasket 204. The inner wall of the lower support seat 202 is equipped with a slow-release gasket 204 for slowing down the expansion stress of the heating furnace tube body 101.

[0025] A connecting flange 102 is fixedly connected at the connection between the heating furnace tube body 101 and the expansion joint 103. The expansion joint 103 is a metal bellows expansion joint. The composite thermal barrier coating 105 includes an adhesive layer 105a, a ceramic layer 105b, and a sealing layer 105c. An expansion joint 103 is installed between two adjacent sets of heating furnace tube bodies 101 to compensate for the expansion and contraction of the heating furnace tube body 101.

[0026] The adhesive layer 105a is a NiCrAlY high-temperature coating, and the ceramic layer 105b is made of yttrium-stabilized zirconium oxide.

[0027] The heating furnace tube body 101 is manufactured by centrifugal casting. The chromium content of the heating furnace tube body 101 gradually increases and the molybdenum content gradually decreases from the inner wall to the outer wall. The composition gradient design gives the inner wall excellent corrosion resistance and the outer wall higher high-temperature strength.

[0028] A spiral structure inner wall support 104 is fixedly connected to the inner wall of the heating furnace tube body 101. The slow-release gasket 204 is made of graphite material. The slow-release gasket 204 supports and limits the heating furnace tube body 101 to release the heat and makes the inner wall support 104 located on the inner wall to support and improve the strength of the tube.

[0029] A support column 201 is fixedly connected below the lower support 202, and the support column 201 is fixedly connected to the heating furnace below.

[0030] Specifically, the heating furnace tube body 101 forms a multi-segment parallel structure during the medium transport. Each heating furnace tube assembly 100 is not set to a very long length. An expansion joint 103 is installed between two adjacent heating furnace tube bodies 101 to compensate for stress dispersion when the heating furnace tube body 101 expands and contracts. The composite thermal barrier coating 105 is set with a three-layer structure. The coating structure can effectively reduce the substrate temperature and thus improve the service life of the furnace tube. Furthermore, the chromium content of the heating furnace tube body 101 gradually increases and the molybdenum content gradually decreases from the inner wall to the outer wall. The composition gradient design gives the inner wall excellent corrosion resistance and the outer wall higher high-temperature strength. Secondly, in the support assembly 200 for the heating furnace tube body 101, the slow-release gasket 204 made of graphite material is in direct contact to relieve stress during the expansion of the heating furnace tube body 101, thereby achieving stress dispersion and improving service life.

[0031] Please see Figures 1-2 and Figures 5-6 As a second embodiment of this utility model: A set of lower connecting plates 203 are fixedly connected to both the front and rear ends of the lower support 202. An upper support assembly 300 is fixedly connected above the lower support 202, and the upper support assembly 300 includes an upper support 301.

[0032] A set of upper connecting plates 302 are fixedly connected to both the front and rear ends of the upper support 301. Two sets of pressure-holding columns 303 are fixedly connected to both the front and rear ends of the inner side of the upper support 301. A pressure-holding groove 205 is opened on the outer side of the slow-release gasket 204. The pressure-holding columns 303 and the pressure-holding groove 205 are fitted together. The lower support 202 and the upper support 301 are sleeved and clamped to the heating furnace tube body 101. The installation of the slow-release gasket 204 is pressed by the fitting of the pressure-holding columns 303 and the pressure-holding groove 205. The lower support 202 and the upper support 301 are connected and fixed with bolts.

[0033] Based on the first embodiment described above, the lower support 202 and the upper support 301 are sleeved and clamped to the heating furnace tube body 101, and the pressure-relieving gasket 204 is installed through the fitting of the pressure-holding column 303 and the pressure-holding groove 205. The lower support 202 and the upper support 301 are connected and fixed with bolts, thereby assisting in the use of the heating furnace tube.

[0034] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A heating furnace tube with a stress dispersion structure, comprising: A heating furnace tube assembly (100) is characterized in that: the heating furnace tube assembly (100) includes a heating furnace tube body (101), an expansion joint (103), and a composite thermal barrier coating (105). The heating furnace tube body (101) is arranged in parallel in several groups. Each group of heating furnace tube bodies (101) is composed of several sections. An expansion joint (103) for adjusting and relieving stress is fixedly connected between adjacent ends of the heating furnace tube bodies (101). Each section of the heating furnace tube body (101) is fixedly connected to a number of support components (200) for support. The support components (200) include a lower support seat (202) and a slow-release gasket (204). The inner wall of the lower support seat (202) is equipped with a slow-release gasket (204) for slowing down the expansion stress of the heating furnace tube body (101).

2. A heating furnace tube with a stress dispersion structure as described in claim 1, characterized in that: A connecting flange (102) is fixedly connected at the connection between the heating furnace tube body (101) and the expansion joint (103). The expansion joint (103) is a metal bellows expansion joint. The composite thermal barrier coating (105) includes an adhesive layer (105a), a ceramic layer (105b), and a sealing layer (105c).

3. A heating furnace tube with a stress dispersion structure as described in claim 2, characterized in that: The adhesive layer (105a) is a NiCrAlY high-temperature coating, and the ceramic layer (105b) is made of yttrium-stabilized zirconium oxide material.

4. A heating furnace tube with a stress dispersion structure as described in claim 3, characterized in that: The heating furnace tube body (101) is manufactured by centrifugal casting. The chromium content of the heating furnace tube body (101) gradually increases and the molybdenum content gradually decreases from the inner wall to the outer wall.

5. A heating furnace tube with a stress dispersion structure as described in claim 1, characterized in that: The inner wall of the heating furnace tube body (101) is fixedly connected with a spiral structure inner wall support (104), and the slow-release gasket (204) is made of graphite material.

6. A heating furnace tube with a stress dispersion structure as described in claim 1, characterized in that: A support column (201) is fixedly connected below the lower support (202), and the support column (201) is fixedly connected to the heating furnace below.

7. A heating furnace tube with a stress dispersion structure as described in claim 1, characterized in that: A set of lower connecting plates (203) are fixedly connected to both the front and rear ends of the lower support (202). An upper support assembly (300) is fixedly connected above the lower support (202), and the upper support assembly (300) includes an upper support seat (301).

8. A heating furnace tube with a stress dispersion structure as described in claim 7, characterized in that: The upper support (301) is fixedly connected to a set of upper connecting plates (302) at both the front and rear ends. The upper support (301) is fixedly connected to two sets of pressure pillars (303) at both the front and rear ends of its inner side. The slow-release gasket (204) has a pressure groove (205) on its outer side. The pressure pillars (303) and the pressure grooves (205) are interlocked.

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