A steel pipe anti-deformation structure

Abstract

This invention discloses a steel pipe anti-deformation structure, comprising: an inner medium-flow steel pipe, the inner surface of which is coated with a ceramic layer; and a middle layer of high-temperature resistant steel pipe fitted onto the outer surface of which is a middle layer of high-temperature resistant steel pipe. The middle layer of high-temperature resistant steel pipe is composed of multiple segments of first high-temperature resistant steel pipes spliced ​​together, with a first expansion joint between adjacent first high-temperature resistant steel pipes. A certain gap is maintained between the inner surface of the middle layer of high-temperature resistant steel pipe and the outer surface of the inner medium-flow steel pipe. This invention's steel pipe anti-deformation structure ensures the straightness of the inner medium-flow steel pipe by adding a composite ceramic layer inside the inner medium-flow steel pipe and adding multiple single-layer or multi-layer high-temperature resistant steel pipes to the outer wall of the steel pipe, thus preventing bending deformation and extending service life.

Description

Technical Field

[0001] This invention relates to the field of composite steel pipes, and in particular to a steel pipe anti-deformation structure. Background Technology

[0002] The medium (including but not limited to gas, powdered solid, and liquid) flows through a steel pipe and is injected into a high-temperature furnace. This steel pipe is subjected to a long-term environment of high temperature, high pressure, and strong airflow interference. Furthermore, due to its considerable length, especially increasing in weight near the nozzle, the steel pipe's material properties are easily altered by high temperatures. Under its own weight and airflow interference, it is prone to bending and deformation, ultimately causing the medium inside the pipe to flow off course when ejected from the nozzle at the pipe head, thus affecting the operating conditions.

[0003] Ceramic composite steel pipe, also known as ceramic-lined composite steel pipe, is manufactured using a high-tech process—the self-propagating high-temperature synthesis method. The pipe consists of three layers from the inside out: corundum ceramic, a transition layer, and steel. Due to its wear-resistant, corrosion-resistant, and heat-resistant properties, it is widely used in industries such as power, metallurgy, mining, coal, and chemicals for transporting abrasive particulate materials and corrosive media such as sand, stone, coal powder, ash, and molten aluminum. It is an ideal wear- and corrosion-resistant pipeline.

[0004] However, although ordinary ceramic composite steel pipes have certain high temperature resistance, corrosion resistance and deformation resistance, their deformation resistance still cannot meet the required effect under high temperature, high pressure and strong airflow interference.

[0005] Existing anti-deformation steel pipes mainly rely on adding support structures to prevent deformation. These structures are complex and not suitable for large-scale use, let alone for use in environments with strong airflow interference.

[0006] Therefore, there is an urgent need for a new type of steel pipe anti-deformation structure that can ensure the straightness of the internal medium flow steel pipe, prevent bending deformation, and extend service life under high temperature, high pressure, and strong airflow interference environments. Summary of the Invention

[0007] The main technical problem solved by this invention is to provide a steel pipe anti-deformation structure that can ensure the straightness of the internal medium flow steel pipe and prevent bending deformation under high temperature, high pressure and strong airflow interference.

[0008] To solve the above-mentioned technical problems, one technical solution adopted by the present invention is to provide a steel pipe anti-deformation structure, comprising: an inner medium flow steel pipe, the inner surface of which is coated with a ceramic layer, and an outer surface of which is fitted with a middle high-temperature resistant steel pipe, wherein the middle high-temperature resistant steel pipe is spliced ​​together from multiple sections of first high-temperature resistant steel pipe, a first expansion joint is left between adjacent first high-temperature resistant steel pipes, and a certain gap is left between the inner surface of the middle high-temperature resistant steel pipe and the outer surface of the inner medium flow steel pipe.

[0009] In a preferred embodiment of the present invention, the steel pipe anti-deformation structure further includes an outer high-temperature resistant steel pipe, which is fitted over the middle high-temperature resistant steel pipe. The outer high-temperature resistant steel pipe is composed of multiple sections of second high-temperature resistant steel pipes spliced ​​together, with a second expansion joint between adjacent second high-temperature resistant steel pipes. A certain gap is left between the inner surface of the outer high-temperature resistant steel pipe and the outer surface of the middle high-temperature resistant steel pipe.

[0010] In a preferred embodiment of the present invention, the first expansion joint and the second expansion joint adopt a beveled structure.

[0011] In a preferred embodiment of the present invention, the first expansion joint and the second expansion joint are arranged in an intersecting and staggered manner.

[0012] In a preferred embodiment of the present invention, it is used to transfer a high-temperature medium into a high-temperature furnace.

[0013] In a preferred embodiment of the present invention, the steel pipe anti-deformation structure includes a root and a head set according to the front and rear positions of the medium flow; the root is fitted with a reinforcing support steel pipe.

[0014] In a preferred embodiment of the present invention, the reinforcing support steel pipe is welded and fixed at the root.

[0015] In a preferred embodiment of the present invention, the inner surface of the end where the reinforcing support steel pipe connects to the middle high-temperature resistant steel pipe and the outer high-temperature resistant steel pipe is stepped, comprising at least a first stepped surface, a second stepped surface and a third stepped surface in sequence. The first stepped surface is adapted to the outer surface of the outer high-temperature resistant steel pipe, the second stepped surface is adapted to the outer surface of the middle high-temperature resistant steel pipe, and the third stepped surface is adapted to the outer surface of the inner medium flow steel pipe.

[0016] In a preferred embodiment of the present invention, a positioning hole is drilled on the upper wall of the middle layer high-temperature resistant steel pipe, and it is fixed to the inner layer medium flow steel pipe by spot welding. A positioning hole is drilled on the wall of the outer layer high-temperature resistant steel pipe, and it is fixed to the middle layer high-temperature resistant steel pipe by spot welding.

[0017] In a preferred embodiment of the present invention, the ceramic layer and the inner medium flow steel pipe form an integral structure.

[0018] The beneficial effects of this invention are as follows: The anti-deformation structure of the steel pipe of this invention has the following advantages:

[0019] 1. By adding a ceramic layer inside the steel pipe, the ceramic layer becomes an integral part of the steel pipe, forming a channel for the flow of media. The ceramic layer has wear-resistant and high-temperature-resistant properties, making it suitable for various media. Furthermore, the ceramic layer provides a certain degree of support to the steel pipe, preventing it from bending and deforming.

[0020] 2. Add multiple sections of single or multiple layers of high-temperature resistant steel pipe with expansion joints to the outer wall of the steel pipe to ensure the straightness of the internal medium flow, prevent bending deformation, and extend service life. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a preferred embodiment of the anti-deformation structure for steel pipes of the present invention;

[0022] Figure 2 This is a schematic diagram of another preferred embodiment of the steel pipe anti-deformation structure of the present invention;

[0023] Figure 3 yes Figure 2 A magnified view of a portion of the image;

[0024] The components in the attached diagram are labeled as follows: 1-Inner medium flow steel pipe, 2-Ceramic layer, 3-Middle high temperature resistant steel pipe, 32-Middle high temperature resistant steel pipe expansion joint, 4-Outer high temperature resistant steel pipe, 42-Outer high temperature resistant steel pipe expansion joint, 33, 43-Steel pipe anti-displacement weld point, 5-Reinforcing support steel pipe, 6-Head, 7-Root. Detailed Implementation

[0025] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby providing a clearer and more explicit definition of the scope of protection of the present invention.

[0026] Please see Figure 1 The embodiments of the present invention include:

[0027] A steel pipe anti-deformation structure includes an inner medium flow steel pipe 1, a ceramic layer 2, a middle high-temperature resistant steel pipe 3, and an outer high-temperature resistant steel pipe 4.

[0028] The inner medium flow steel pipe 1 is the base steel pipe, and the ceramic layer 2 is laminated on the inner surface of the inner medium flow steel pipe 1. The thickness of the ceramic layer 2 is selectable according to the working conditions. The ceramic layer 2 and the inner medium flow steel pipe 1 form an integral part, becoming the channel for medium flow. The ceramic layer 2 has wear-resistant and high-temperature resistant properties, making it suitable for various media. Furthermore, the ceramic layer 2 provides a certain supporting force to the inner medium flow steel pipe 1, preventing bending and deformation. The pipe diameter and wall thickness are selectable according to the working conditions.

[0029] The intermediate high-temperature resistant steel pipe 3 is composed of multiple sections of steel pipe spliced ​​together, with the length of each section evenly distributed according to the total length of the equipment. An expansion joint in the form of a bevel (expansion joint 32 of the intermediate high-temperature resistant steel pipe) is left between each section. The steel pipe material is high-temperature resistant steel, and the pipe diameter and wall thickness can be selected according to the working conditions. A certain gap is left between the inner wall of the intermediate high-temperature resistant steel pipe 3 and the outer wall of the inner medium flow steel pipe 1. The purpose of the gap is to reduce heat conduction between the two and prevent heat from being directly transferred to the inner medium flow steel pipe 1. Positioning holes are drilled on the wall surface of the intermediate high-temperature resistant steel pipe 3, and it is fixed to the inner medium flow steel pipe 1 by spot welding to prevent displacement.

[0030] The outer high-temperature resistant steel pipe 4 is also composed of multiple sections of steel pipe spliced ​​together, with the length of each section evenly distributed according to the total length of the equipment. An expansion joint in the form of a bevel (outer high-temperature resistant steel pipe expansion joint 42) is left between each section of steel pipe. The steel pipe material is high-temperature resistant steel, and the diameter and wall thickness can be selected according to the working conditions. A certain gap is left between the inner wall of the outer high-temperature resistant steel pipe 4 and the outer wall of the middle high-temperature resistant steel pipe 3. The purpose of the gap is to reduce heat conduction between the two and prevent heat from being directly transferred to the middle high-temperature resistant steel pipe 3. Positioning holes are drilled on the wall of the outer high-temperature resistant steel pipe 4, and it is fixed to the middle high-temperature resistant steel pipe 3 by spot welding to prevent displacement.

[0031] The expansion joints 32 and 42 of the middle-layer high-temperature resistant steel pipe adopt a beveled structure, and their positions are arranged in a cross-shaped and staggered manner. After the steel pipe is heated to a high temperature, it will have a certain linear expansion along its length (along the length of the steel pipe). As a result, the gap between the expansion joints decreases until the beveled sections come into contact with each other. After contact, each section of the steel pipe forms a certain supporting force with each other. The beveled shape increases the contact surface between each section of the steel pipe, providing stronger supporting force when the steel pipe expands, thereby ensuring that the innermost medium-flow steel pipe 1 does not bend or deform.

[0032] Combination Figure 2 and Figure 3The diagram shows another preferred structure of the steel pipe anti-deformation structure of the present invention, wherein the steel pipe anti-deformation structure includes a root and a head portion defined according to the front and rear positions of the medium flow. Figure 1 Compared to the embodiment shown, the anti-deformation structure of the steel pipe also includes a reinforcing support steel pipe 5 installed at the root 7.

[0033] Because the inner medium flow steel pipe 1 is relatively long and heavy, the bending deformation of the steel pipe closer to the far end of the flow path due to its own weight after high temperature is more severe. Therefore, in this embodiment, a reinforcing support of a certain length and wall thickness is added to the root 7. The reinforcing support is made of heat-resistant steel pipe. The inner medium flow steel pipe 1, the middle high-temperature resistant steel pipe 3, and the outer high-temperature resistant steel pipe 4 are all fitted into the reinforcing support steel pipe 5 at the root 7 and welded in place. The reinforcing support steel pipe 5 provides a certain lateral support force to the above three components with a certain wall thickness and length, further reducing the bending deformation of the head steel pipe due to its own weight after high temperature.

[0034] Preferably, the inner surface of the end of the reinforcing support steel pipe 5 that connects to the middle high-temperature resistant steel pipe 3 and the outer high-temperature resistant steel pipe 4 is stepped, including at least a first stepped surface, a second stepped surface and a third stepped surface in sequence. The first stepped surface is adapted to the outer surface of the outer high-temperature resistant steel pipe 4, the second stepped surface is adapted to the outer surface of the middle high-temperature resistant steel pipe 3, and the third stepped surface is adapted to the outer surface of the inner medium flow steel pipe 1.

[0035] The steel pipe anti-deformation structure of this invention adds a composite ceramic layer inside the inner medium flow steel pipe and adds multiple single-layer or multi-layer high-temperature resistant steel pipes to the outer wall of the steel pipe to ensure the straightness of the internal medium flow steel pipe, prevent bending deformation, and extend service life.

[0036] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A steel pipe anti-deformation structure, characterized in that, include: The inner medium flow steel pipe has a ceramic layer on its inner surface and a middle high-temperature resistant steel pipe on its outer surface. The middle high-temperature resistant steel pipe is spliced ​​from multiple sections of first high-temperature resistant steel pipe. A first expansion joint is left between adjacent first high-temperature resistant steel pipes. A certain gap is left between the inner surface of the middle high-temperature resistant steel pipe and the outer surface of the inner medium flow steel pipe. The steel pipe anti-deformation structure also includes an outer high-temperature resistant steel pipe, which is fitted over the middle high-temperature resistant steel pipe. The outer high-temperature resistant steel pipe is made up of multiple sections of second high-temperature resistant steel pipes spliced ​​together. A second expansion joint is left between adjacent second high-temperature resistant steel pipes. A certain gap is left between the inner surface of the outer high-temperature resistant steel pipe and the outer surface of the middle high-temperature resistant steel pipe. The first expansion joint and the second expansion joint adopt a beveled structure. After the steel pipes are heated, the first expansion joint and the second expansion joint decrease until the bevels come into contact with each other, and supporting forces are formed between adjacent first high-temperature resistant steel pipes and between adjacent second high-temperature resistant steel pipes.

2. The anti-deformation structure for steel pipes according to claim 1, characterized in that, The first expansion joint and the second expansion joint are arranged in an intersecting and staggered manner.

3. The anti-deformation structure for steel pipes according to claim 1, characterized in that, Used to transfer high-temperature media into a high-temperature furnace.

4. The anti-deformation structure for steel pipes according to claim 1, characterized in that, The steel pipe anti-deformation structure includes a root and a head, which are set according to the front and rear positions of the medium flow; the root is fitted with a reinforcing support steel pipe.

5. The anti-deformation structure for steel pipes according to claim 4, characterized in that, The inner surface of the end where the reinforcing support steel pipe connects to the middle high-temperature resistant steel pipe and the outer high-temperature resistant steel pipe is stepped, and includes at least a first stepped surface, a second stepped surface and a third stepped surface in sequence. The first stepped surface is adapted to the outer surface of the outer high-temperature resistant steel pipe, the second stepped surface is adapted to the outer surface of the middle high-temperature resistant steel pipe, and the third stepped surface is adapted to the outer surface of the inner medium flow steel pipe.

6. The anti-deformation structure for steel pipes according to claim 4, characterized in that, The reinforcing support steel pipe is welded and fixed at the root.

7. The anti-deformation structure for steel pipes according to claim 1, characterized in that, The middle layer high-temperature resistant steel pipe has positioning holes drilled on its wall surface and is fixed to the inner layer medium flow steel pipe by spot welding. The outer layer high-temperature resistant steel pipe has positioning holes drilled on its wall surface and is fixed to the middle layer high-temperature resistant steel pipe by spot welding.

8. The anti-deformation structure for steel pipes according to claim 1, characterized in that, The ceramic layer and the inner medium flow steel pipe form an integral structure.

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