Novel methanol fuel double-wall conveying pipeline

Abstract

The utility model 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 present application belongs to the field of fuel delivery, and particularly relates to a novel methanol fuel double-wall delivery pipeline. BACKGROUND

[0002] The ship low-speed engine manufacturing enterprises continuously promote the development of low-carbon zero-carbon engines and new fuel supply systems. In order to meet the methanol dual-fuel ship low-speed engine, a methanol supply system needs to be built. Methanol is widely used as clean fuel in the fields of ships, chemical industry, etc., but its flammable, volatile and toxic properties put high requirements on the safety of the delivery pipeline.

[0003] In the prior art, double-wall pipelines are used for hazardous medium delivery, but they have the following problems: rigid support structure: the inner and outer pipes of the traditional double-wall pipeline are connected by welding or fixed supports, which is complex to install and lacks flexibility, leading to deformation or even damage of the pipeline when it is heated and expanded or vibrates, and high maintenance cost; low ventilation efficiency: the gap between the inner and outer pipes of the existing double-wall pipeline is non-uniformly designed, the air flow resistance is large, the leaked methanol vapor is difficult to discharge 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 it is difficult to give timely warning after leakage occurs, with prominent safety hazards. SUMMARY

[0004] To solve the problems of the prior art, such as the inability to give timely alarm when the fuel pipeline delivery pipeline leaks, high safety hazards, complex manufacturing and installation, high maintenance cost, low ventilation efficiency and unsuitability for complex working conditions, the present application provides a novel methanol fuel double-wall delivery pipeline, which comprises a double-wall outer pipe and a double-wall inner pipe arranged inside the double-wall outer pipe; an elastic support assembly is arranged between the inner wall of the double-wall outer pipe and the outer wall of the double-wall inner pipe; the double-wall inner pipe is used for delivering fuel, and the double-wall outer pipe is a ventilation pipe; a uniform annular ventilation cavity is formed between the inner wall of the double-wall outer pipe and the outer wall of the double-wall inner pipe by 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 double-wall inner pipe; the support spring is arranged in compression between the support seat and the inner wall of the double-wall outer pipe, so as to flexibly support the double-wall inner pipe and maintain the ventilation cavity; the double-wall outer pipe is connected with a ventilation fan and a leakage detection sensor; when the double-wall inner pipe leaks, the methanol fuel enters the ventilation cavity and is transported by the flowing air to the leakage detection sensor to trigger an alarm; the support spring can adjust the support force and be replaced.

[0005] According to the novel methanol fuel double-wall delivery pipeline of the above-mentioned claim, the support seat and the double-wall inner pipe are fixed by welding.

[0006] According to the novel methanol fuel double-wall pipeline above, the ventilation cavity is continuously distributed along the axis of the double-wall inner pipe, and the width is adjusted by the compression amount of the supporting spring.

[0007] According to the novel methanol fuel double-wall pipeline above, the leakage detection sensor is a hydrocarbon sensor, and is arranged at the outlet end of the double-wall outer pipe.

[0008] According to the novel methanol fuel double-wall pipeline above, the supporting spring is a spiral spring, and is made of corrosion-resistant metal or high-molecular polymer.

[0009] According to the novel methanol fuel double-wall pipeline above, a branch pipeline is arranged between the double-wall outer pipe and the ventilation fan, for accelerating the air flow in the ventilation space.

[0010] According to the novel methanol fuel double-wall pipeline above, the elastic supporting assemblies are uniformly distributed along the circumference of the double-wall inner pipe, and no less than three elastic supporting assemblies are arranged per meter of pipeline.

[0011] According to the novel methanol fuel double-wall pipeline above, the inner wall of the double-wall outer pipe is coated with an anti-static coating.

[0012] According to the novel methanol fuel double-wall pipeline above, the end of the double-wall outer pipe is connected with a waste gas treatment device, for collecting the leaked fuel vapor.

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

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

[0015] 1. The elastic supporting assemblies are arranged between the inner wall of the double-wall outer pipe and the outer wall of the double-wall inner pipe; the double-wall inner pipe is used for transporting fuel, and the double-wall outer pipe is a ventilation pipe; the elastic supporting assemblies form a uniform annular ventilation cavity between the inner wall of the double-wall outer pipe and the outer wall of the double-wall inner pipe; when the double-wall inner pipe leaks, the methanol fuel enters the ventilation cavity and is transported to the leakage detection sensor through the flowing air to trigger an alarm; the supporting spring can adjust the supporting force and can be replaced, the elastic supporting assemblies ensure the uniform and smooth annular ventilation cavity, improve the safety of the fuel pipeline, can timely alarm after leakage, is simple to manufacture and install, and is suitable for complex working conditions.

[0016] 2. The outer tube of the double-wall pipe of the present application is connected with a ventilation fan; the end of the outer tube of the double-wall pipe is connected with a waste gas treatment device for collecting leaked fuel vapor, discharging leaked methanol vapor in time, eliminating the risk of explosion caused by accumulation in the pipeline, and improving the safety of fuel delivery.

[0017] 3. The outer tube of the double-wall pipe of the present application is connected with a ventilation fan and a leakage detection sensor; when the inner tube of the double-wall pipe leaks, methanol fuel enters the ventilation cavity and carries the vapor of leaked fuel to the leakage detection sensor through flowing air to trigger an alarm; real-time leakage detection is realized, and safety and reliability are significantly improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a new methanol fuel double-wall delivery pipeline application system diagram of the present application.

[0019] Figure 2 is a cross-sectional view of a new methanol fuel double-wall delivery pipeline of the present application.

[0020] Figure 3 is an A-A cross-sectional view of a cross-sectional view of a new methanol fuel double-wall delivery pipeline of the present application.

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

[0022] Preferred Embodiment

[0023] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. All other embodiments obtained by those skilled in the art on the basis of the embodiments in the present application without creative labor are within the scope of protection of the present application.

[0024] As Figures 1-3The application discloses a novel methanol fuel double-wall pipeline, which comprises a double-wall outer pipe 6 and a double-wall inner pipe 7 arranged in the double-wall outer pipe 6; an elastic supporting assembly is arranged between the inner wall of the double-wall outer pipe 6 and the outer wall of the double-wall inner pipe 7; the double-wall inner pipe 7 is used for conveying fuel, and the double-wall outer pipe 6 is a ventilation pipe; a uniform annular ventilation cavity is formed between the inner wall of the double-wall outer pipe 6 and the outer wall of the double-wall inner pipe 7 through the elastic supporting assembly; the elastic supporting assembly is composed of a supporting seat 91 and a supporting spring 92; the supporting seat 91 is fixedly arranged on the outer wall of the double-wall inner pipe 7; the supporting spring 92 is arranged in compression between the supporting seat 91 and the inner wall of the double-wall outer pipe 6, so as to flexibly support the double-wall inner pipe 7 and maintain the ventilation cavity; the double-wall outer pipe 6 is connected with a ventilation fan 41 and a leakage detection sensor 42; when the double-wall inner pipe 7 leaks, methanol fuel enters the ventilation cavity and is conveyed to the leakage detection sensor 42 through flowing air to trigger an alarm; the supporting spring 92 can be adjusted in supporting force and can be replaced.

[0025] The supporting seat 91 and the double-wall inner pipe 7 are fixed through welding. The ventilation cavity is continuously distributed along the axis of the double-wall inner pipe 7, and the width of the ventilation cavity is adjusted through the compression amount of the supporting spring 92. The leakage detection sensor 42 is a hydrocarbon sensor, which is arranged at the outlet end of the double-wall outer pipe 6.

[0026] The supporting spring 92 is a spiral spring, and the material of the supporting spring 92 is a corrosion-resistant metal or a high-molecular polymer. A branch pipeline 3 is arranged between the double-wall outer pipe 6 and the ventilation fan 41, so as to accelerate the air flow in the ventilation space. The elastic supporting assemblies are uniformly distributed along the circumference of the double-wall inner pipe 7, and no less than three elastic supporting assemblies are arranged per meter of pipeline. The inner wall of the double-wall outer pipe 6 is coated with an anti-static coating.

[0027] The end of the double-wall outer pipe 6 is connected with a waste gas treatment device, which is used for collecting leaked fuel vapor. The pipeline is suitable for conveying methanol, LNG or ammonia fuel.

[0028] As Figure 2As shown, the double-wall pipeline includes a double-wall outer pipe 6, a double-wall inner pipe 7, and an elastic support assembly. The double-wall inner pipe 7 is made of corrosion-resistant stainless steel and is used to transport methanol fuel. The double-wall outer pipe 6 is a ventilation pipe made of lightweight aluminum alloy. The double-wall outer pipe 6 and the double-wall inner pipe 7 are connected by the elastic support assembly to form a uniform annular ventilation space. The elastic support assembly is composed of a support seat 91 and a support spring 92. The support seat 91 is annular in structure and is fixed to the outer wall of the double-wall inner pipe 7 by welding. The surface of the support seat 91 is provided with a spring mounting groove. The support spring 92 is made of corrosion-resistant spiral spring and is installed in the groove of the support seat 91. By compressing the spring 92, the top end of the spring 92 is tightly attached to the inner wall of the double-wall outer pipe 6, thereby flexibly fixing the double-wall inner pipe 7 and maintaining the width of the ventilation cavity at 10-20 mm. 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] As shown in Figure 1 The end of the double-wall outer pipe 6 is connected to a ventilation fan 41 and a branch pipeline 3. The ventilation fan 41 continuously inputs air into the ventilation space to form a directional airflow. When the inner pipe 7 leaks, the methanol fuel seeps into the ventilation cavity and is transported to the end of the double-wall outer pipe 6 along with the airflow. A leakage detection sensor 42 is installed at this location to monitor the concentration of methanol vapor in real time. If the concentration exceeds the standard, the leakage detection sensor 42 triggers an alarm signal and closes the double-wall inner pipe 7 for transportation. An emergency valve is activated to start the waste gas treatment device, such as an activated carbon adsorption tower, to prevent the spread of vapor.

[0030] Installation and maintenance: assemble the elastic support assembly: weld the support seat 91 on the outer wall of the double-wall inner pipe 7 at an interval of 1 meter, insert the pre-set support spring 92, and then put the whole into the double-wall outer pipe 6. Pipeline connection: connect the double-wall pipes in sections through flanges. The double-wall outer pipe 6 and the branch pipeline 3, ventilation fan 41 are fixed by sealing clamps to ensure air tightness.

[0031] Debugging and monitoring: start the ventilation fan 41 and use the flow meter to verify the uniformity of the airflow in the ventilation cavity. The pressure test confirms the sealing performance of the double-wall inner pipe, and the alarm threshold of the leakage detection sensor is calibrated.

[0032] The spring assembly buffers vibration and thermal stress, prolonging the service life of the pipeline. The uniform ventilation cavity reduces flow resistance, and the exhaust speed of the leaked vapor is increased by more than 40%. By replacing the sensor type, such as an ammonia gas sensor, the structure can be extended to transport LNG, liquid ammonia, and other dangerous media.

[0033] The above description is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any skilled person in the art can make equivalent replacements or changes within the technical scope disclosed in the present application according to the technical solution and inventive concept of the present application, which should be covered within the protection scope of the present application.

Claims

1. A novel methanol fuel double-walled delivery pipe, characterized by, The double-wall pipe comprises an outer pipe (6) and an inner pipe (7) arranged inside the outer pipe (6); an elastic support assembly is arranged between the inner wall of the outer pipe (6) and the outer wall of the inner pipe (7); the inner pipe (7) is used for conveying fuel, and the outer pipe (6) is a ventilation pipe; a uniform annular ventilation cavity is formed between the inner wall of the outer pipe (6) and the outer wall of the inner pipe (7) by the elastic support assembly; the elastic support assembly 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 inner pipe (7); the support spring (92) is arranged in compression between the support seat (91) and the inner wall of the outer pipe (6) to flexibly support the inner pipe (7) and maintain the ventilation cavity; the outer pipe (6) is connected with a ventilation fan (41) and a leakage detection sensor (42); when the inner pipe (7) leaks, methanol fuel enters the ventilation cavity and is conveyed to the leakage detection sensor (42) through flowing air to trigger an alarm; the support spring (92) can adjust the support force and can be replaced.

2. A novel methanol fuel double-walled delivery pipe according to claim 1, characterized in that, The support seat (91) and the inner pipe (7) are fixed by welding.

3. A novel methanol fuel double-wall delivery pipe according to claim 2, characterized in that, The ventilation cavity is continuously distributed along the axis of the inner pipe (7), and the width is adjusted by the compression amount of the support spring (92).

4. A novel methanol fuel double-wall delivery pipe according to claim 3, characterized in that, The leakage detection sensor (42) is a hydrocarbon sensor arranged at the outlet end of the outer pipe (6).

5. A novel methanol fuel double-walled delivery pipe according to claim 4, characterized in that, The support spring (92) is a spiral spring made of corrosion-resistant metal or high-molecular polymer.

6. A novel methanol fuel double-wall delivery pipe according to claim 5, characterized in that, A branch pipe (3) is arranged between the outer pipe (6) and the ventilation fan (41) to accelerate the air flow in the ventilation space.

7. A novel methanol fuel double-wall delivery pipe according to claim 6, characterized in that, The elastic support assemblies are evenly distributed along the circumference of the inner pipe (7), and each meter of pipe is provided with not less than 3 elastic support assemblies.

8. A novel methanol fuel double-wall delivery pipe according to claim 7, characterized in that, The inner wall of the outer pipe (6) is coated with an anti-static coating.

9. A novel methanol fuel double-wall delivery pipe according to claim 8, characterized in that, The end of the outer pipe (6) is connected with a waste gas treatment device for collecting leaked fuel vapor.

10. A novel methanol fuel double-wall delivery pipe according to any one of claims 1 to 9, characterized in that, The pipe is suitable for conveying methanol, LNG or ammonia fuel.

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