Novel methanol fuel double-wall conveying pipeline

Abstract

The invention belongs to the field of fuel conveying, and particularly relates to a novel methanol fuel double-wall conveying pipeline. An elastic supporting assembly is arranged between the inner wall of an outer pipe (6) of the double-wall pipe and the outer wall of an inner pipe (7) of the double-wall pipe, so that a uniform annular ventilation cavity is formed between the inner pipe and the outer pipe; when the inner pipe (7) of the double-wall pipe leaks, methanol fuel enters the ventilation cavity, and steam of the leaked fuel is conveyed to the leakage detection sensor (42) through flowing air to trigger an alarm; the elastic supporting assembly ensures that the annular ventilation cavity is uniform and smooth, the safety of a fuel pipeline conveying pipeline is improved, an alarm can be given in time after leakage occurs, and the device is easy to manufacture and install and suitable for complex working condition environments. And leaked methanol steam is discharged in time, so that the explosion risk caused by accumulation in the pipeline is eliminated, and the fuel conveying safety is improved.

Description

Technical Field

[0001] The invention belongs to the field of fuel transportation, and in particular relates to a novel methanol fuel double-wall transportation pipeline. Background Art

[0002] The shipbuilding industry is facing transformation and upgrading. Marine low-speed engine manufacturing companies continue to advance in the development of low-carbon and zero-carbon engines and new fuel supply systems. In order to meet the needs of methanol dual-fuel marine low-speed engines, a methanol supply system needs to be built. Methanol is increasingly used as a clean fuel in the fields of ships, chemicals, etc., but its flammable, volatile and toxic characteristics place extremely high demands on the safety of the transmission pipeline.

[0003] In the prior art, double-walled pipelines are used to transport hazardous media, but they have the following problems: Rigid support structure: The traditional double-walled pipes are connected by welding or fixed brackets, which are complex to install and lack flexibility, resulting in deformation or even damage of the pipes when they are heated, expanded or vibrated, and high maintenance costs; Low ventilation efficiency: The gaps between the inner and outer pipes of the existing double-walled pipes are mostly non-uniformly designed, with large air flow resistance, and leaked methanol vapor is difficult to be discharged in time, and is easy to accumulate in the pipeline to form an explosion risk; Passive leakage protection: The existing technology relies on the physical isolation of sealing materials, lacks active monitoring and emergency response, and is difficult to warn in time after a leak occurs, with prominent safety hazards. . Summary of the invention

[0004] The present invention aims to solve the problems of the prior art that the fuel pipeline delivery pipeline cannot timely alarm when leakage occurs, has great safety hazards, is complicated to manufacture and install, has high maintenance costs, has low ventilation efficiency, and cannot be applied to complex working conditions. A new type of methanol fuel double-wall delivery pipeline is proposed, comprising a double-wall outer tube, and a double-wall inner tube arranged inside the double-wall outer tube; an elastic support component is arranged between the inner wall of the double-wall outer tube and the outer wall of the double-wall inner tube; the double-wall inner tube is used for delivering fuel, and the double-wall outer tube is a ventilation tube; a ventilation tube is arranged between the inner wall of the double-wall outer tube and the outer wall of the double-wall inner tube A uniform annular ventilation cavity is formed through the elastic support assembly; the elastic support assembly is composed of a support seat and a support spring; the support seat is fixedly arranged on the outer wall of the inner tube of the double-walled tube; the support spring is compressed and arranged between the support seat and the inner wall of the outer tube of the double-walled tube, and the inner tube of the double-walled tube is fixed in a flexible support manner and the ventilation cavity is maintained; the outer tube of the double-walled tube is connected to a ventilation fan and a leakage detection sensor, and when the inner tube of the double-walled tube leaks, methanol fuel enters the ventilation cavity and transports the vapor of the leaked fuel to the leakage detection sensor through the flowing air to trigger an alarm; the support spring can adjust the supporting force and is replaceable.

[0005] According to the novel double-walled methanol fuel transportation pipeline described above, the support seat and the inner tube of the double-walled tube are fixed by welding.

[0006] According to the novel double-walled methanol fuel delivery pipeline described above, the ventilation cavity is continuously distributed along the axial direction of the inner tube of the double-walled tube, and its width is adjusted by the compression amount of the support spring.

[0007] According to the novel double-walled methanol fuel transportation pipeline described above, the leakage detection sensor is a hydrocarbon sensor, which is arranged at the outlet end of the outer tube of the double-walled tube.

[0008] According to the novel double-walled methanol fuel delivery pipeline described above, the support spring is a coil spring, and its material is corrosion-resistant metal or high molecular polymer.

[0009] According to the novel double-walled methanol fuel transportation pipeline described above, a branch pipeline is provided between the outer tube of the double-walled tube and the ventilation fan to accelerate the air flow in the ventilation space.

[0010] According to the novel double-walled methanol fuel transportation pipeline described above, the elastic support components are evenly distributed along the circumference of the inner tube of the double-walled tube, and no less than 3 groups of elastic support components are arranged per meter of pipeline.

[0011] According to the novel double-walled methanol fuel transportation pipeline described above, the inner wall of the outer tube of the double-walled tube is coated with an antistatic coating.

[0012] According to the novel double-walled methanol fuel transportation pipeline described above, the end of the outer tube of the double-walled tube is connected to an exhaust gas treatment device for collecting leaked fuel vapor.

[0013] According to the new double-walled methanol fuel transportation pipeline described above, the pipeline is suitable for the transportation of methanol, LNG or ammonia fuel.

[0014] The beneficial effects of the present invention are as follows:

[0015] 1. An elastic support assembly is arranged between the inner wall of the double-walled tube outer tube and the outer wall of the double-walled tube inner tube of the present invention; the double-walled tube inner tube is used for transporting fuel, and the double-walled tube outer tube is a ventilation pipe; a uniform annular ventilation cavity is formed between the inner wall of the double-walled tube outer tube and the outer wall of the double-walled tube inner tube through the elastic support assembly; when the double-walled tube inner tube leaks, the methanol fuel enters the ventilation cavity and transports the vapor of the leaked fuel to the leakage detection sensor through the flowing air to trigger an alarm; the support spring has adjustable supporting force and is replaceable, and the elastic support assembly ensures the uniform and smooth flow of the annular ventilation cavity, improves the safety of the fuel pipeline transport pipeline, can promptly alarm after a leak occurs, is simple to manufacture and install, and is suitable for complex working conditions.

[0016] 2. The outer tube of the double-walled tube of the present invention is connected to a ventilation fan; the end of the outer tube of the double-walled tube is connected to an exhaust gas treatment device for collecting leaked fuel vapor so that the leaked methanol vapor can be discharged in time, eliminating the risk of explosion caused by accumulation in the pipeline and improving the safety of fuel transportation.

[0017] 3. The outer tube of the double-walled tube of the present invention is connected to a ventilation fan and a leakage detection sensor. When the inner tube of the double-walled tube leaks, the methanol fuel enters the ventilation cavity and transports the vapor of the leaked fuel to the leakage detection sensor through the flowing air to trigger an alarm; real-time leakage detection is achieved, significantly improving safety and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is an application system diagram of a novel double-walled methanol fuel transportation pipeline of the present invention.

[0019] Figure 2 It is a cross-sectional view of a novel double-walled methanol fuel transportation pipeline of the present invention.

[0020] Figure 3 It is an AA sectional view of a sectional view of a novel double-wall methanol fuel transportation pipeline of the present invention.

[0021] In the figure: 1-double-wall pipeline, 3-branch pipeline, 6-double-wall pipe outer pipe, 7-double-wall pipe inner pipe, 41-ventilation fan, 42-leakage detection sensor, 92-support spring. DETAILED DESCRIPTION

[0022] Preferred Embodiments

[0023] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0024] like Figure 1-3As shown: a novel double-walled methanol fuel delivery pipeline, comprising a double-walled outer tube 6, and a double-walled inner tube 7 arranged inside the double-walled outer tube 6; an elastic support component is arranged between the inner wall of the double-walled outer tube 6 and the outer wall of the double-walled inner tube 7; the double-walled inner tube 7 is used to transport fuel, and the double-walled outer tube 6 is a ventilation tube; a uniform annular ventilation cavity is formed between the inner wall of the double-walled outer tube 6 and the outer wall of the double-walled inner tube 7 through the elastic support component; the elastic support component is composed of a support seat 91 and a support spring 92; The support seat 91 is fixedly arranged on the outer wall of the double-walled tube inner tube 7; the support spring 92 is compressed and arranged between the support seat 91 and the inner wall of the double-walled tube outer tube 6, fixing the double-walled tube inner tube 7 in a flexible supporting manner and maintaining the ventilation cavity; the double-walled tube outer tube 6 is connected to the ventilation fan 41 and the leakage detection sensor 42. When the double-walled tube inner tube 7 leaks, the methanol fuel enters the ventilation cavity and transports the vapor of the leaked fuel to the leakage detection sensor 42 through the flowing air to trigger an alarm; the support spring 92 can adjust the supporting force and is replaceable.

[0025] The support seat 91 is fixed to the double-walled inner tube 7 by welding. The ventilation cavity is continuously distributed along the axial direction of the double-walled inner tube 7, and its width is adjusted by the compression amount of the support spring 92. The leakage detection sensor 42 is a hydrocarbon sensor, which is arranged at the outlet end of the double-walled outer tube 6.

[0026] The support spring 92 is a spiral spring made of corrosion-resistant metal or high polymer. A branch pipeline 3 is provided between the double-walled outer tube 6 and the ventilation fan 41 to accelerate the air flow in the ventilation space. The elastic support components are evenly distributed along the circumference of the double-walled inner tube 7, and no less than 3 groups of elastic support components are provided per meter of the pipeline. The inner wall of the double-walled outer tube 6 is coated with an antistatic coating.

[0027] The end of the double-walled outer pipe 6 is connected to an exhaust gas treatment device for collecting leaked fuel vapor. The pipeline is suitable for transporting methanol, LNG or ammonia fuel.

[0028] like Figure 2As shown, the double-wall pipeline includes a double-wall outer tube 6, a double-wall inner tube 7 and an elastic support assembly. The double-wall inner tube 7 is made of corrosion-resistant stainless steel and is used to transport methanol fuel; the double-wall outer tube 6 is a ventilation pipe made of lightweight aluminum alloy, and an annular ventilation space with uniform width is formed between the double-wall outer tube 6 and the double-wall inner tube 7 through the elastic support assembly. The elastic support assembly consists of a support seat 91 and a support spring 92; the support seat 91 is annular in structure, fixed to the outer wall of the double-wall inner tube 7 by welding, and a spring mounting groove is provided on the surface. The support spring 92 is a corrosion-resistant coil spring, which is installed in the groove of the support seat 91. By compressing the spring 92, its top end is tightly fitted with the inner wall of the double-wall outer tube 6, thereby flexibly fixing the double-wall inner tube 7 and maintaining the width of the ventilation cavity at 10-20mm. By replacing the support spring 92 with different stiffness or length, the support force can be adjusted to adapt to the working conditions such as pipeline pressure and temperature changes.

[0029] like Figure 1 As shown, the end of the double-walled tube outer tube 6 is connected to the ventilation fan 41 and the branch pipeline 3, and the ventilation fan 41 continuously inputs air into the ventilation space to form a directional airflow. When the inner tube 7 leaks, the methanol fuel penetrates into the ventilation cavity and is transported to the end of the double-walled tube outer tube 6 with the airflow, where a leak detection sensor 42 is installed to monitor the methanol vapor concentration in real time. If the concentration exceeds the standard, the leak detection sensor 42 triggers an alarm signal, the emergency valve is linked to close the double-walled tube inner tube 7, and the exhaust gas treatment device, such as an activated carbon adsorption tower, is started to prevent vapor diffusion.

[0030] Installation and maintenance: Assemble the elastic support assembly: Weld the support seat 91 evenly to the outer wall of the double-walled inner tube 7 at a spacing of 1 meter, insert the preset support spring 92 and then insert the whole into the double-walled outer tube 6. Pipeline connection: Connect the double-walled pipe in sections through flanges, and fix the double-walled outer tube 6 to the branch pipeline 3 and the ventilation fan 41 with sealing clamps to ensure air tightness.

[0031] Debugging and monitoring: Start the ventilation fan 41 and verify the uniformity of the airflow in the ventilation cavity using a flow meter; confirm the tightness of the inner tube of the double-walled tube through a pressure test and calibrate the alarm threshold of the leakage detection sensor.

[0032] The spring assembly buffers vibration and thermal stress, extending the life of the pipeline. The uniform ventilation cavity reduces flow resistance, and the leakage steam discharge speed is increased by more than 40%. By replacing the sensor type, such as ammonia sensor, this structure can be expanded to the transportation of hazardous media such as LNG and liquid ammonia.

[0033] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A new type of methanol fuel double-walled pipeline, characterized in that: The invention comprises a double-walled outer tube (6) and a double-walled inner tube (7) arranged inside the double-walled outer tube (6); an elastic support component is arranged between the inner wall of the double-walled outer tube (6) and the outer wall of the double-walled inner tube (7); the double-walled inner tube (7) is used to transport fuel, and the double-walled outer tube (6) is a ventilation tube; a uniform annular ventilation cavity is formed between the inner wall of the double-walled outer tube (6) and the outer wall of the double-walled inner tube (7) through the elastic support component; the elastic support component is composed of a support seat (91) and a support spring (92); the support seat (91) is fixed The double-walled tube inner tube (7) is fixedly arranged on the outer wall of the double-walled tube inner tube (7); the support spring (92) is compressed and arranged between the support seat (91) and the inner wall of the double-walled tube outer tube (6), and fixes the double-walled tube inner tube (7) in a flexible supporting manner and maintains the ventilation cavity; the double-walled tube outer tube (6) is connected to a ventilation fan (41) and a leakage detection sensor (42); when the double-walled tube inner tube (7) leaks, methanol fuel enters the ventilation cavity and transports the vapor of the leaked fuel to the leakage detection sensor (42) through the flowing air, triggering an alarm; the support spring (92) can adjust the support force and is replaceable.

2. A new type of methanol fuel double-walled pipeline according to claim 1, characterized in that: The support seat (91) and the double-walled inner tube (7) are fixed by welding.

3. A new type of methanol fuel double-walled transportation pipeline according to claim 2, characterized in that: The ventilation cavity is continuously distributed along the axial direction of the double-walled inner tube (7), and its width is adjusted by the compression amount of the support spring (92).

4. A new type of methanol fuel double-walled pipeline according to claim 3, characterized in that: The leakage detection sensor (42) is a hydrocarbon sensor, which is arranged at the outlet end of the double-walled outer tube (6).

5. A new type of methanol fuel double-walled pipeline according to claim 4, characterized in that: The support spring (92) is a spiral spring, and its material is corrosion-resistant metal or high molecular polymer.

6. A new type of methanol fuel double-walled pipeline according to claim 5, characterized in that: A branch pipeline (3) is provided between the double-walled outer tube (6) and the ventilation fan (41) to accelerate the flow of air in the ventilation space.

7. A new type of methanol fuel double-walled pipeline according to claim 6, characterized in that: The elastic support components are evenly distributed along the circumference of the double-walled inner tube (7), and no less than 3 groups of elastic support components are arranged per meter of pipeline.

8. The novel double-walled methanol fuel delivery pipeline according to claim 7 is characterized in that: The inner wall of the double-walled outer tube (6) is coated with an antistatic coating.

9. A new type of methanol fuel double-walled pipeline according to claim 8, characterized in that: The end of the double-walled outer tube (6) is connected to an exhaust gas treatment device for collecting leaked fuel vapor.

10. A new type of methanol fuel double-walled transportation pipeline according to any one of claims 1 to 9, characterized in that: The pipeline is suitable for transporting methanol, LNG or ammonia fuel.

Images