An expansion joint for the outlet lining pipe of a sulfuric acid industrial furnace
By designing an expansion joint structure consisting of an outer pipe, an inner pipe, deformable parts, and reinforcing parts, the problems of high temperature resistance, wear resistance, and corrosion resistance of the outlet lining pipe of the sulfuric acid industrial furnace were solved, achieving long-term stable operation and low-cost construction.
Patent Information
- Application Number
- CN202522503109.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-26
- Publication Date
- 2026-11-06
- Estimated Expiration
- 2035-11-26
AI Technical Summary
The existing corrugated expansion joint structure cannot meet the requirements of high temperature resistance, wear resistance and corrosion resistance of the outlet lining pipe of sulfuric acid industrial furnace, and is prone to pipe deformation or perforation due to thermal expansion and dew point corrosion.
The expansion joint structure consists of an outer tube, an inner tube, deformable parts, reinforcing parts, and a heat-insulating and wear-resistant lining. The deformable parts are composed of a ring plate and a cylinder. The ring plate absorbs the thermal expansion during thermal expansion. The reinforcing parts increase the connection strength. The heat-insulating and wear-resistant lining is fixed by claw nails. The interface is designed as a stepped type to prevent flue gas leakage.
It achieves long-term stable operation in high-temperature environments, prevents pipeline deformation and corrosion, reduces construction difficulty and manufacturing costs, and improves the durability of the equipment.
Smart Images
Figure CN224944484U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to an expansion joint for the outlet lining pipe of a sulfuric acid industrial furnace. Background Technology
[0002] In the smelting of pyrite, gold concentrate and other ores to produce sulfuric acid, fluidized bed furnaces are often used to roast the ore. The flue gas produced by roasting is usually first processed by a waste heat recovery boiler to recover the waste heat, and then enters the subsequent unit equipment to finally produce industrial sulfuric acid that meets national standards.
[0003] Sulfur, hydrogen sulfide-containing acidic gas, waste sulfuric acid, sulfur-containing waste liquid, etc. are generally produced by high-temperature incineration in vertical or horizontal incinerators. The resulting high-temperature flue gas is first sent to downstream units for waste heat recovery in waste heat boilers, and finally industrial sulfuric acid that meets national standards is produced.
[0004] The flue gas produced by the above processes is at a very high temperature, generally between 900 and 1300°C, and contains a large amount of dust, especially the flue gas from mineral-based acid production, which carries a large amount of mineral dust. This places certain requirements on the connecting pipes between the incinerator or fluidized bed furnace and the waste heat boiler. They must be both high-temperature resistant and wear-resistant. Conventional high-temperature resistant stainless steel pipes made of 304 or 310S materials are no longer sufficient to meet these requirements. In industry, a wear-resistant and high-temperature resistant insulating lining is generally used inside the stainless steel pipes.
[0005] Because the outer wall temperature of this section of pipeline remains relatively high, expansion joints are needed to absorb the expansion caused by the thermal expansion of the metal pipeline. In industry, corrugated pipe expansion joints are commonly used for high-temperature metal pipelines. However, the thin walls of corrugated pipes result in poor rigidity at high temperatures. Adding an insulation lining increases the pipeline's weight, making it prone to sinking and deformation under its own weight when using a corrugated pipe expansion joint structure. Furthermore, due to the special structure of the corrugated pipe, installing an insulation lining in the expansion joint is challenging and usually requires a more complex structure. Additionally, the flue gas generated by the aforementioned processes contains trace amounts of sulfur trioxide, which can easily cause dew point corrosion on the contacting equipment and pipelines when the flue gas temperature is low. To minimize pipeline stress during thermal expansion, corrugated pipe expansion joints have thinner walls, typically around 3mm, making them more susceptible to deformation. However, they are also more prone to perforation when encountering dew point corrosion due to flue gas leaks. Utility Model Content
[0006] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the present invention.
[0007] The technical problem this invention aims to solve is that the existing corrugated pipe expansion joint structure cannot meet the requirements for use in the outlet lining pipes of sulfuric acid industrial furnaces.
[0008] To solve the above-mentioned technical problems, this utility model provides the following technical solution: an expansion joint for a lining pipe at the outlet of a sulfuric acid industrial furnace, comprising an outer pipe, an inner pipe, a deformable component, a reinforcing component, a heat-insulating and wear-resistant lining, and claw studs. The outer pipe is divided into two sections, and the inner pipe is embedded inside the two sections of the outer pipe. The deformable component is disposed on the outside of the two sections of the outer pipe to absorb the thermal expansion of the connecting pipe. The reinforcing component is disposed on the deformable component to increase the connection strength. The heat-insulating and wear-resistant lining is disposed on the inner surface of the outer pipe and the inner pipe by claw studs.
[0009] As a preferred embodiment of the expansion joint for the outlet lining pipe of the sulfuric acid industrial furnace described in this utility model, the deformable component includes two ring plates and a cylinder. The two ring plates are respectively disposed at two adjacent ends of two outer pipe sections, and the cylinder is sleeved on the two ring plates. When the device is running, the temperature of the flue gas flowing in the pipe is 900 to 1300 degrees Celsius, which will cause thermal expansion of the metal outer wall of the pipe. At this time, the ring plates will be squeezed by the thermal expansion of the two pipe sections and will deform in the axial direction of the pipe to absorb the thermal expansion of the connecting pipe.
[0010] As a preferred embodiment of the expansion joint for the outlet lining pipe of the sulfuric acid industrial furnace described in this utility model, the reinforcing member includes a first angle steel and a second angle steel. The first angle steel is disposed at the connection between the two ring plates and the outer pipe, and the second angle steel is disposed at the connection between the two ring plates and the cylinder, so as to increase the connection strength between the ring plates and the outer pipe and between the cylinder and the ring plates.
[0011] As a preferred embodiment of the expansion joint for the outlet lining pipe of the sulfuric acid industrial furnace described in this utility model, the heat-insulating and wear-resistant lining is divided into two sections, and an interface is formed between the two sections of the heat-insulating and wear-resistant lining so that the heat-insulating and wear-resistant lining can undergo thermal expansion deformation when high-temperature flue gas passes through.
[0012] As a preferred embodiment of the expansion joint for the outlet lining pipe of the sulfuric acid industrial furnace described in this utility model, the interface is stepped, which not only facilitates construction, but also prevents flue gas from escaping from the stepped expansion joint when the two sections of heat-insulating and wear-resistant lining expand at high temperature, as the stepped interface between the two sections of heat-insulating and wear-resistant lining forms a staggered closure.
[0013] As a preferred embodiment of the expansion joint for the outlet lining pipe of the sulfuric acid industrial furnace described in this utility model, the interface is filled with refractory fiber to achieve a certain effect of high temperature resistance and corrosion resistance.
[0014] As a preferred embodiment of the expansion joint for the outlet lining pipe of a sulfuric acid industrial furnace according to this utility model, the wall thickness of the outer pipe is the same as the wall thickness of the connecting pipe, which facilitates welding with the connecting pipe.
[0015] As a preferred embodiment of the expansion joint for the outlet lining pipe of the sulfuric acid industrial furnace described in this utility model, the outer diameter of the inner tube is 5-10mm smaller than the inner diameter of the outer tube, so that a gap of 2.5-5mm is left between the outer tube and the inner tube to prevent the inner and outer tubes from getting stuck and to facilitate the relative movement of the inner and outer tubes during thermal expansion.
[0016] As a preferred embodiment of the expansion joint for the outlet lining pipe of the sulfuric acid industrial furnace described in this utility model, the wall thickness of the ring plate is less than or equal to the wall thickness of the outer pipe to reduce the resistance to the deformation of the ring plate. However, if it is too thin, it will also lead to insufficient strength and deformation of the expansion joint. Therefore, the wall thickness of the ring plate should not be too thin, and the outer diameter of the ring plate depends on the size of the outer pipe and the amount of thermal expansion of the pipe that needs to be absorbed.
[0017] As a preferred embodiment of the expansion joint for the outlet lining pipe of a sulfuric acid industrial furnace according to this utility model, the wall thickness of the cylinder is greater than or equal to the wall thickness of the outer pipe, so as to increase the structural strength of the entire expansion joint.
[0018] Beneficial effects:
[0019] 1. By cooperating with each other, the outer pipe, inner pipe, deformable parts and reinforcing parts absorb the thermal expansion of the connecting pipe, thereby meeting the usage requirements of the sulfuric acid industrial furnace outlet lining pipe and ensuring that the entire unit can operate stably for a long time.
[0020] 2. By designing the heat-insulating and wear-resistant lining into two sections, and setting a stepped interface between the two sections, the thermal expansion of the heat-insulating and wear-resistant lining is absorbed, further ensuring the long-term stable operation of the entire device; 3. The expansion joint has a simple overall structure, is easy to construct, has low manufacturing cost, and is durable. Attached Figure Description
[0021] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments 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. Among them:
[0022] Figure 1 This is a schematic diagram of the overall structure of an expansion joint used in the outlet lining pipe of a sulfuric acid industrial furnace.
[0023] Figure 2 Expansion joints for use in the outlet lining pipes of sulfuric acid industrial furnaces Figure 1 Enlarged view of point A in the middle.
[0024] In the diagram: 1. Outer tube; 2. Inner tube; 3. Deformable part; 31. Ring plate; 32. Cylinder; 4. Reinforcing part; 41. First angle steel; 42. Second angle steel; 5. Heat-insulating and wear-resistant lining; 6. Claw nail; 7. Interface; 8. Refractory fiber. Detailed Implementation
[0025] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.
[0026] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.
[0027] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments.
[0028] Example 1
[0029] Reference Figure 1 and Figure 2 This embodiment provides an expansion joint for the outlet lining pipe of a sulfuric acid industrial furnace, including an outer pipe 1, an inner pipe 2, a deformable part 3, a reinforcing part 4, a heat-insulating and wear-resistant lining 5, and claw studs 6. The outer pipe 1 is divided into two sections, and the inner pipe 2 is embedded in the two sections of the outer pipe 1. The deformable part 3 is disposed on the outside of the two sections of the outer pipe 1 to absorb the thermal expansion of the connecting pipe. The reinforcing part 4 is disposed on the deformable part 3 to increase the connection strength. The heat-insulating and wear-resistant lining 5 is disposed on the inner surface of the outer pipe 1 and the inner pipe 2 through the claw studs 6.
[0030] The outer pipe 1 serves as the installation base for this expansion joint and is divided into two sections. During installation, both ends of the outer pipe 1 are welded to the metal connecting pipes or equipment ports. An inner pipe 2 is embedded inside the outer pipe 1. In this embodiment, both the outer pipe 1 and the inner pipe 2 are circular tubes; in other embodiments, square tubes may be used depending on the upstream equipment. The material of the inner and outer pipes 1 can be 304, 316, 310S stainless steel, or 20# steel. The specific material selection depends on the pipe wall temperature and the temperature of different process flue gas. The inner pipe 2 is located within the two sections of the outer pipe 1 and has… The inner tube 2 is fixedly connected to the inner wall of the outer tube 1 on the left side by welding at its left end. The right end of the inner tube 2 is suspended and has no connection, allowing it to expand freely. Deformable parts 3 are installed at the adjacent ends of the two outer tube 1 sections. These parts absorb the thermal expansion of the connecting pipes. Reinforcing parts 4 are installed on the deformable parts 3 to increase their connection strength. Claw studs 6 are evenly distributed on the inner surfaces of the outer tube 1 and the inner tube 2. The heat-insulating and wear-resistant lining 5 is installed on the inner surfaces of the outer tube 1 and the inner tube 2 via the claw studs 6, providing heat insulation. The purpose of the heat-insulating and wear-resistant lining 5 is to prevent it from being carbonized or deformed by high-temperature flue gas. The thickness of the heat-insulating and wear-resistant lining 5 depends on the temperature of the flue gas inside the pipe, and is generally not less than 50mm. It can be made of plastic refractory materials such as lightweight castable, high-alumina castable, and corundum castable. The thickness and material selection of the heat-insulating and wear-resistant lining 5 can be determined according to the temperature of the flue gas, as well as the composition and impurity content of the flue gas. The length of the claw nail 6 depends on the thickness of the heat-insulating and wear-resistant lining 5. Generally, the length of the claw nail 6 is 30mm shorter than the thickness of the heat-insulating and wear-resistant lining 5. The material can be 304, 316, or 314 stainless steel. The stainless steel is 0S, and the shape can be Y-shaped or T-shaped, etc. The material of the claw nail 6 depends on the temperature of the flue gas. The claw nail 6 can be fixedly connected to the inner tube 2 and the outer tube 1 by welding. In this embodiment, the outer tube 1, inner tube 2, deformable part 3 and reinforcing part 4 cooperate with each other, which can not only absorb the thermal expansion of the connected pipe, but also adopt a multi-layer nested structure to avoid the expansion joint perforation caused by dew point corrosion due to flue gas leakage. This meets the usage requirements of the sulfuric acid industrial furnace outlet lining pipe and ensures that the entire device can operate stably for a long time.
[0031] Specifically, the deformable component 3 includes two ring plates 31 and a cylinder 32. The two ring plates 31 are respectively disposed at two adjacent ends of the two outer tubes 1, and the cylinder 32 is sleeved on the two ring plates 31.
[0032] In this embodiment, the deformable component 3 mainly consists of two ring plates 31 and a cylinder 32. The two ring plates 31 are welded to the two adjacent ends of the two outer pipes 1 by welding. The material of the ring plates 31 can be carbon steel or 304, 316, or 310S stainless steel. The cylinder 32 is fitted over the two ring plates 31 and is fixedly connected to the two ring plates 31 by welding. The width of the cylinder 32 depends on the length of the connecting pipe and the amount of thermal expansion of the pipe to be absorbed. The material of the cylinder 32 can be carbon steel or 304, 316, or 310S stainless steel. When the device is running, the temperature of the flue gas flowing in the pipe is 900 to 1300 degrees Celsius, which will cause thermal expansion of the metal outer wall of the pipe. At this time, the ring plates 31 will be squeezed by the thermal expansion of the two outer pipes 1 and will deform in the axial direction of the pipe to absorb the amount of thermal expansion of the connecting pipe.
[0033] Specifically, the reinforcing member 4 includes a first angle steel 41 and a second angle steel 42. The first angle steel 41 is located at the connection between the two ring plates 31 and the outer tube 1, and the second angle steel 42 is located at the connection between the two ring plates 31 and the cylinder 32.
[0034] The reinforcing member 4 is mainly composed of a first angle steel 41 and a second angle steel 42. The first angle steel 41 is welded at the connection between the two ring plates 31 and the outer tube 1, and the second angle steel 42 is welded at the connection between the two ring plates 31 and the cylinder 32 to increase the connection strength between the ring plates 31 and the outer tube 1 and between the cylinder 32 and the ring plates 31.
[0035] Furthermore, the heat-insulating and wear-resistant lining 5 is divided into two sections, and an interface 7 is formed between the two sections of the heat-insulating and wear-resistant lining 5.
[0036] In this embodiment, the heat-insulating and wear-resistant lining 5 is divided into two sections, and an interface 7 is formed between the two sections of the heat-insulating and wear-resistant lining 5 so that the heat-insulating and wear-resistant lining 5 can undergo thermal expansion deformation when high-temperature flue gas passes through. The width of the interface 7 depends on the amount of thermal expansion of the heat-insulating and wear-resistant lining 5 that needs to be absorbed.
[0037] Furthermore, interface 7 is stepped.
[0038] In this embodiment, the interface 7 is designed as a stepped type, which not only facilitates construction, but also prevents flue gas from escaping from the stepped expansion joint when the two sections of heat-insulating and wear-resistant lining 5 expand at high temperature.
[0039] Furthermore, the interface 7 is filled with refractory fiber 8.
[0040] In this embodiment, refractory fiber 8 is filled into the interface 7 to achieve a certain effect of high temperature resistance and corrosion resistance. The refractory fiber 8 can be made of aluminum silicate fiber, ceramic fiber, alumina fiber and mullite fiber, etc. Different materials have different temperature resistance and corrosion resistance properties. The specific material selection can be made according to actual needs.
[0041] Furthermore, the wall thickness of the outer pipe 1 is the same as the wall thickness of the connecting pipe.
[0042] In this embodiment, the wall thickness of the outer tube 1 is the same as that of the connecting pipe, so that the outer tube 1 and the connecting pipe can be fixedly connected by welding.
[0043] Furthermore, the outer diameter of the inner tube 2 is 5-10 mm smaller than the inner diameter of the outer tube 1.
[0044] In this embodiment, the outer diameter of the inner tube 2 is 5-10 mm smaller than the inner diameter of the outer tube 1, so that there is a gap of 2.5-5 mm between the outer tube 1 and the inner tube 2, to prevent the inner and outer tubes 1 from getting stuck and to facilitate the relative movement of the inner and outer tubes 1 during thermal expansion.
[0045] Furthermore, the wall thickness of the ring plate 31 is less than or equal to the wall thickness of the outer tube 1.
[0046] In this embodiment, the wall thickness of the ring plate 31 is less than or equal to the wall thickness of the outer tube 1 to reduce the resistance to deformation of the ring plate 31. However, if it is too thin, it will also lead to insufficient strength and deformation of the expansion joint. Therefore, the wall thickness of the ring plate 31 should not be too thin. The outer diameter of the ring plate 31 depends on the size of the outer tube 1 and the amount of thermal expansion of the pipeline that needs to be absorbed.
[0047] Furthermore, the wall thickness of cylinder 32 is greater than or equal to the wall thickness of outer tube 1.
[0048] In this embodiment, the wall thickness of the cylinder 32 is greater than or equal to the wall thickness of the outer tube 1, so as to increase the structural strength of the entire expansion joint.
[0049] When the device is running, high-temperature flue gas enters the outer pipe 1 and inner pipe 2 of the expansion joint, causing thermal expansion of the metal outer wall of the pipe and the heat-insulating and wear-resistant lining 5. Since the left and right ends of the outer pipe 1 are connected to the equipment and are fixed ends, the direction of the expansion stress is directed towards the expansion joint. The thermal expansion of the pipe is absorbed by the deformation of the two ring plates 31 on the outer pipe 1 towards the center of the expansion joint. The heat-insulating and wear-resistant lining 5 is the same as the pipe. The left and right ends of the heat-insulating and wear-resistant lining 5 are fixed ends. Therefore, when the heat-insulating and wear-resistant lining 5 expands, the two ends are squeezed towards the interface 7 until the interface 7 is closed. The refractory fiber 8 inside the interface 7 is compacted to absorb the thermal expansion of the heat-insulating and wear-resistant lining 5.
[0050] Example 2
[0051] In this embodiment, the expansion joint from Embodiment 1 is applied to the outlet lining pipe of a waste sulfuric acid incinerator. The outer pipe 1 has a specification of 1020x10mm, and the inner pipe 2 has a specification of 990x10mm. Two 1620x1020x6mm ring plates 31 are welded to the outer wall of the outer pipe 1. A 200mm wide cylinder 32 is welded to the outside of the ring plates 31. Y-shaped claw studs 6 with a height of 120mm are welded to the inner walls of the outer pipe 1 and the inner pipe 2. Lightweight castable heat-insulating and wear-resistant linings 5 are provided on the inner walls of both the outer pipe 1 and the inner pipe 2. The thickness of the heat-insulating and wear-resistant linings 5 is 150mm. The interface 7 between the two heat-insulating and wear-resistant linings 5 is stepped and 40mm wide. Ceramic fiber blankets are filled into the interface 7. The expansion joint is made of 304 stainless steel.
[0052] Example 3
[0053] In this embodiment, the expansion joint from Embodiment 1 is applied to the outlet lining pipe of a sulfur incinerator. The outer pipe 1 has a specification of 1420x10mm, and the inner pipe 2 has a specification of 1390x10mm. Two 2020x1420x8mm ring plates 31 are welded to the outer wall of the outer pipe 1. A 230mm wide cylinder 32 is welded to the outside of the ring plates 31. Y-shaped claw studs 6 with a height of 150mm are welded to the inner walls of the outer pipe 1 and the inner pipe 2. Lightweight castable heat-insulating and wear-resistant linings 5 are provided on the inner walls of both the outer pipe 1 and the inner pipe 2. The thickness of the heat-insulating and wear-resistant lining 5 is 180mm. The interface 7 between the two heat-insulating and wear-resistant linings 5 is stepped and 45mm wide. The interface 7 is filled with aluminum silicate fiber blanket. The expansion joint is made of 316 stainless steel.
[0054] Example 4
[0055] In this embodiment, the expansion joint from Embodiment 1 is applied to the outlet lining pipe of the hydrogen sulfide incinerator. The outer pipe 1 has a specification of 1820x12mm, and the inner pipe 2 has a specification of 1790x12mm. Two 2220x1820x8mm ring plates 31 are welded to the outer wall of the outer pipe 1. A 250mm wide cylinder 32 is welded to the outside of the ring plates 31. T-shaped claws 6 with a height of 170mm are welded to the inner walls of the outer pipe 1 and the inner pipe 2. Corundum castable heat-insulating and wear-resistant linings 5 are provided on the inner walls of both the outer pipe 1 and the inner pipe 2. The thickness of the heat-insulating and wear-resistant linings 5 is 200mm. The interface 7 between the two heat-insulating and wear-resistant linings 5 is stepped and 50mm wide. Ceramic fiber blankets are filled into the interface 7. The material of the expansion joint is 310S stainless steel.
[0056] Example 5
[0057] In this embodiment, the expansion joint from Embodiment 1 is applied to the outlet lining pipe of an acrylonitrile sulfur-containing waste incinerator. The outer pipe 1 has a specification of 2020x12mm, and the inner pipe 2 has a specification of 1990x12mm. Two 2520x2020x8mm ring plates 31 are welded to the outer wall of the outer pipe 1. A 300mm wide cylinder 32 is welded to the outside of the ring plates 31. Y-shaped claw studs 6 with a height of 200mm are welded to the inner walls of the outer pipe 1 and the inner pipe 2. The inner walls of both the outer pipe 1 and the inner pipe 2 are provided with high-alumina castable heat-insulating and wear-resistant linings 5. The thickness of the heat-insulating and wear-resistant linings 5 is 240mm. The interface 7 between the two heat-insulating and wear-resistant linings 5 is stepped and 55mm wide. The interface 7 is filled with alumina fiber blanket. The expansion joint is made of 304 stainless steel.
[0058] Example 6
[0059] In this embodiment, the expansion joint from Embodiment 1 is applied to the outlet lining pipe of a pyrite fluidized bed furnace. The outer pipe 1 has a size of 1500x1000x10mm, and the inner pipe 2 has a size of 1490x990x10mm. Two 2000x1500x7mm ring plates 31 are welded to the outer wall of the outer pipe 1. A 200mm wide cylinder 32 is welded to the outside of the ring plates 31. Y-shaped claw studs 6 with a height of 120mm are welded to the inner walls of the outer pipe 1 and the inner pipe 2. Lightweight castable heat-insulating and wear-resistant linings 5 are provided on the inner walls of both the outer pipe 1 and the inner pipe 2. The thickness of the heat-insulating and wear-resistant linings 5 is 150mm. The interface 7 between the two heat-insulating and wear-resistant linings 5 is stepped and 35mm wide. Ceramic fiber blankets are filled into the interface 7. The material of the expansion joint is 20# steel.
[0060] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.
Claims
1. An expansion joint for use in the outlet lining pipe of a sulfuric acid industrial furnace, characterized in that: It includes an outer tube (1), an inner tube (2), a deformable part (3), a reinforcing part (4), a heat-insulating and wear-resistant lining (5), and claw studs (6). The outer tube (1) is divided into two sections, and the inner tube (2) is embedded in the two sections of the outer tube (1). The deformable part (3) is set on the outside of the two sections of the outer tube (1) to absorb the thermal expansion of the connecting pipe. The reinforcing part (4) is set on the deformable part (3) to increase the connection strength. The heat-insulating and wear-resistant lining (5) is set on the inner surface of the outer tube (1) and the inner tube (2) by the claw studs (6).
2. The expansion joint for the outlet lining pipe of a sulfuric acid industrial furnace as described in claim 1, characterized in that: The deformable component (3) includes two ring plates (31) and a cylinder (32). The two ring plates (31) are respectively disposed at the two adjacent ends of the two outer tubes (1), and the cylinder (32) is sleeved on the two ring plates (31).
3. The expansion joint for the outlet lining pipe of a sulfuric acid industrial furnace as described in claim 2, characterized in that: The reinforcing member (4) includes a first angle steel (41) and a second angle steel (42). The first angle steel (41) is located at the connection between the two ring plates (31) and the outer tube (1), and the second angle steel (42) is located at the connection between the two ring plates (31) and the cylinder (32).
4. The expansion joint for the outlet lining pipe of a sulfuric acid industrial furnace as described in claim 1, characterized in that: The heat-insulating and wear-resistant lining (5) is divided into two sections, and an interface (7) is formed between the two sections of heat-insulating and wear-resistant lining (5).
5. The expansion joint for the outlet lining pipe of a sulfuric acid industrial furnace as described in claim 4, characterized in that: The interface (7) is stepped.
6. The expansion joint for the outlet lining pipe of a sulfuric acid industrial furnace as described in claim 4, characterized in that: The interface (7) is filled with refractory fiber (8).
7. The expansion joint for the outlet lining pipe of a sulfuric acid industrial furnace as described in claim 1, characterized in that: The wall thickness of the outer tube (1) is the same as that of the connecting pipe.
8. The expansion joint for the outlet lining pipe of a sulfuric acid industrial furnace as described in claim 1, characterized in that: The outer diameter of the inner tube (2) is 5-10 mm smaller than the inner diameter of the outer tube (1).
9. The expansion joint for the outlet lining pipe of a sulfuric acid industrial furnace as described in claim 2, characterized in that: The wall thickness of the ring plate (31) is less than or equal to the wall thickness of the outer tube (1).
10. The expansion joint for the outlet lining pipe of a sulfuric acid industrial furnace as described in claim 9, characterized in that: The wall thickness of the cylinder (32) is greater than or equal to the wall thickness of the outer tube (1).