Liquid sulphur transfer steam jacketed pipe

Abstract

The utility model discloses a kind of liquid sulphur conveying steam jacketed pipe, including several groups of inner tube and several groups of outer tube, and several groups of inner tube are connected head to tail by welding to form conveying inner tube, and the welding position of adjacent two groups of inner tube forms weld, and outer tube is coaxially arranged at the outside of inner tube, the outside of inner tube is covered except weld area, and outer tube and the outer wall of inner tube form jacket, and the outer wall of outer tube is provided with two groups of nipple, and two groups of nipple are used for the inflow and outflow of steam, by the position setting of outer tube avoiding weld outside inner tube, and setting gasket plate to steam flow buffering and guiding in the nipple and inner tube adjacent area of steam entering, effectively solve the traditional jacketed pipe weld hidden defect and steam scouring problem, significantly improve the safety and operating efficiency of liquid sulphur conveying system.

Description

Technical Field

[0001] This utility model relates to the technical field of sulfuric acid production equipment, specifically to a liquid sulfur conveying steam jacket pipe. Background Technology

[0002] In sulfuric acid production plants and solid sulfur refining processes, the reliability and safety of liquid sulfur transport pipelines are crucial. Liquid sulfur has a high freezing point (approximately 121°C) and high viscosity, requiring steam jacket insulation to maintain its temperature and ensure its fluidity. However, traditional steam jacketed pipe designs suffer from the following technical drawbacks:

[0003] (1) Risk of weld corrosion and leakage

[0004] Traditional jacketed pipes employ a concealed weld seam structure, with the weld seam encased within the outer pipe. During liquid sulfur transportation, the inner pipe weld seam is prone to corrosion and perforation due to prolonged contact with corrosive media containing hydrogen sulfide, leading to liquid sulfur leakage into the jacket layer. The leaked liquid sulfur mixes with steam condensate to form solid sulfur, clogging the jacket space and forcing system shutdown for maintenance, severely impacting production efficiency. Furthermore, the concealed weld seam is difficult to detect promptly using conventional inspection methods (such as radiographic testing), posing a safety hazard.

[0005] (2) Pipe wall damage caused by steam impact

[0006] The steam injection point of the steam jacket usually blows directly onto the inner tube wall. Long-term high-speed steam scouring can easily cause local thinning or cracks in the inner tube, further increasing the risk of leakage. In the existing technology, although the impact can be partially mitigated by expanding the diameter of the jacket and using a 90° bend in the steam injection pipe (downward blowing design), the problem of concentrated scouring of the weld area by the steam flow has not been fundamentally solved.

[0007] Therefore, there is an urgent need for a new type of liquid sulfur steam jacketed pipe to solve the problems of hidden defects in the weld seams and steam erosion in traditional jacketed pipes. Utility Model Content

[0008] The purpose of this invention is to provide a liquid sulfur steam jacket pipe to solve the problems mentioned in the background art.

[0009] To achieve the above objectives, this utility model provides a liquid sulfur transport steam jacket pipe, comprising several sets of inner pipes and several sets of outer pipes. The sets of inner pipes are connected end to end by welding to form a transport inner pipe. The welding positions of adjacent sets of inner pipes form a weld. The outer pipes are coaxially arranged outside the inner pipes, covering the outer area of ​​the inner pipes except for the weld area. The outer pipes and the outer walls of the inner pipes form a jacket. The outer walls of the outer pipes are provided with two sets of threaded joints for the inflow and outflow of steam.

[0010] As a further preferred option, the installation spacing between two adjacent sets of outer tubes is 8-10 mm, and they are installed symmetrically along the weld seam.

[0011] As a further preferred option, flanges are provided at both ends of the steam jacket pipe, and the flanges are used to connect the two sets of steam jacket pipes.

[0012] As a further preferred option, a gasket is provided on the outer wall of the inner tube at the position corresponding to the threaded joint for steam inflow, and the gasket buffers the inflowing steam.

[0013] As a further preferred embodiment, the pad is provided with an inclined surface on the side adjacent to the threaded joint. The inclined surface is inclined along the direction of steam flow and the angle α with the horizontal plane is 10-20°.

[0014] As a further preferred option, the gasket material is any one of annealed copper, a composite gasket of 304 stainless steel coated with flexible graphite, or a composite gasket of 316 stainless steel coated with flexible graphite.

[0015] Through the above technical solution, the liquid sulfur transport steam jacket pipe provided by this utility model has the following advantages:

[0016] This utility model avoids the leakage of liquid sulfur from the weld seam in the inner pipe due to excessive transport pressure, which would cause the steam jacket pipe to become blocked and thus improve production efficiency and safety.

[0017] Meanwhile, since the weld is exposed to the outside, it can be detected by radiographic testing of pressure pipelines to understand the operation of the weld and avoid the problem that it is difficult to detect the weld leakage in time when it is set inside the casing in traditional designs.

[0018] Furthermore, a gasket is installed in the area adjacent to the steam inlet threaded joint and the inner tube to buffer and guide the steam flow, reducing the impact of the steam flow on the inner tube and improving the operational stability of the inner tube. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the liquid sulfur transport steam jacket pipe structure of this utility model.

[0020] Figure 2 This is a schematic cross-sectional view of the jacket structure of this utility model.

[0021] Figure 3 This is a schematic diagram of the pad structure of this utility model.

[0022] In the diagram: 1. Flange, 2. Inner pipe, 3. Threaded joint, 4. Weld, 5. Outer pipe, 6. Gasket. 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] The present invention will be further described in detail with reference to the accompanying drawings.

[0025] Please see Figure 1 - Figure 3 The liquid sulfur transport steam jacket pipe provided by this utility model includes several sets of inner pipes 2 connected end to end, outer pipes 5 set outside the inner pipes 2, and flanges 1 set at both ends of the jacket pipe.

[0026] Specifically, the inner pipe 2 includes straight pipes and bends, which are connected end to end by welding to form a through pipe with open ends. The welding positions of two adjacent sets of inner pipes 2 form a weld seam 4. The outer pipe 5 is coaxially arranged outside the inner pipe 2, avoiding the weld seam 4 and wrapping the outer wall of the inner pipe 2. The outer pipe 5 and the inner pipe 2 form a jacket. Two sets of threaded joints 3 are provided on the outside of the outer pipe 5. Steam enters the area formed by the outer pipe 5 and the inner pipe 2 from one set of threaded joints 3 to heat the inside of the inner pipe 2, and flows out from the other set of threaded joints 3. The two adjacent sets of outer pipes 5 are connected by a gas pipe, and the two adjacent sets of jacket pipes are connected by a flange 1.

[0027] It should be added that the inner pipe 2 and the outer pipe 5 are made of carbon steel pipe.

[0028] Please see Figure 2 A pad 6 is fixedly connected to the outside of the inner tube 2 at the corresponding position of the threaded joint 3 where steam flows in. The width of the weld 4 is 1-2 mm. The installation positions of two adjacent sets of outer tubes 5 are symmetrical along the weld 4, and the distance between the end of the outer tube 5 and the weld 4 is 3-5 mm. This ensures that the steam inside the sleeve fully heats the inside of the inner tube 2, while facilitating radiographic testing of the weld 4.

[0029] Please see Figure 3 An inclined surface is provided on the upper end face of the pad 6 adjacent to the threaded joint 3. The inclined surface is inclined along the direction of steam flow and the angle α with the horizontal plane is 10-20°.

[0030] Specifically, steam is introduced into the jacket through the threaded connector 3. The inclined surface of the threaded connector 3 guides and disperses the steam flow, preventing the steam flow from directly impacting the inner tube and affecting the stability of the inner tube's transport.

[0031] Furthermore, the material of the gasket 6 is any one of annealed copper, a composite gasket of 304 stainless steel coated with flexible graphite, or a composite gasket of 316 stainless steel coated with flexible graphite. This material balances strength and resistance to fluid erosion, while also possessing a certain degree of toughness, thus buffering the airflow and further reducing its impact.

[0032] Principle: Based on the required length in the pipeline construction drawings, select an inner pipe 2 of appropriate length and shape and connect them end-to-end by welding to form a conveying inner pipe with open ends. Weld a pad 6 to the outer wall of the inner pipe 2 at the corresponding position of the jacket steam inlet. The inclined surface and the elasticity of the material itself buffer and guide the steam flow, preventing the steam from directly scouring the outer wall of the inner pipe 2. Insert the outer pipe 5 into the inner pipe 2 and weld the outer pipe 5 to the outer wall of the inner pipe 2 in a 3-5mm area before and after the weld 4, exposing the weld 4. Use radiographic testing to check the quality of the inner pipe weld 4 to ensure 100% qualification. Connect each set of jacket pipes through flange 1 and put sulfur into the conveying inner pipe for transportation. Use DN20 seamless steel pipe and corresponding model elbows and threaded joints 3 to connect the separate sections of the outer pipe 5 and introduce 0.6MPa saturated steam. High-pressure steam of 140-150℃ is transported into the outer pipe 5 through the threaded joints 3 to ensure that the temperature of the conveying inner pipe is not lower than the melting point of sulfur and to ensure stable transportation of liquid sulfur.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art 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 appended claims and their equivalents.

Claims

1. A liquid sulfur transport steam jacket pipe, comprising several sets of inner pipes (2) and several sets of outer pipes (5), characterized in that: Several sets of inner tubes (2) are connected end to end by welding to form a conveying inner tube. The welding positions of two adjacent sets of inner tubes (2) form a weld (4). The outer tube (5) is coaxially arranged outside the inner tube (2) to cover the area outside the inner tube (2) except for the weld (4). The outer tube (5) and the outer wall of the inner tube (2) form a jacket. The outer wall of the outer tube (5) is provided with two sets of threaded joints (3). The two sets of threaded joints (3) are used for the inflow and outflow of steam.

2. The liquid sulfur transport steam jacket pipe according to claim 1, characterized in that: The installation spacing between two adjacent sets of outer tubes (5) is 8-10 mm, and they are installed symmetrically along the weld (4).

3. The liquid sulfur transport steam jacket pipe according to claim 1, characterized in that: The steam jacket pipe is provided with flanges (1) at both ends, and the flanges (1) are used to connect the two sets of steam jacket pipes.

4. The liquid sulfur transport steam jacket pipe according to claim 1, characterized in that: A gasket (6) is provided on the outer wall of the inner tube (2) at the position corresponding to the threaded connector (3) for steam inflow, and the gasket (6) buffers the inflowing steam.

5. The liquid sulfur transport steam jacket pipe according to claim 4, characterized in that: The pad (6) is provided with an inclined surface on the side adjacent to the threaded connector (3). The inclined surface is inclined along the steam flow direction and the angle α with the horizontal plane is 10-20°.

6. The liquid sulfur transport steam jacket pipe according to claim 5, characterized in that: The material of the pad (6) is any one of annealed copper, 304 stainless steel coated with flexible graphite composite pad, or 316 stainless steel coated with flexible graphite composite pad.

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