Marine methanol fuel storage device

Abstract

The utility model discloses a marine methanol fuel storage device, which relates to the technical field of methanol storage, and specifically comprises a methanol storage device, the methanol storage device is provided with a nitrogen sealing and ventilating structure, and the nitrogen sealing and ventilating structure comprises a conventional working condition pressure control structure and an emergency working condition pressure control structure; the conventional working condition pressure control structure comprises a nitrogen sealing structure and a nitrogen unloading structure, and the emergency working condition pressure control structure comprises a rupture disk ventilation structure and a manual emergency unloading structure; the nitrogen sealing structure takes external nitrogen as a nitrogen source, and the opening and closing of the nitrogen sealing valve are correspondingly adjusted according to the pressure of the methanol storage device through the nitrogen sealing valve, so that the nitrogen is automatically supplied to the methanol storage device. According to the marine methanol fuel storage device, on the basis of a conventional methanol storage system, a nitrogen sealing and ventilation structure is additionally arranged, in the emergency situation, automatic pressure relief of the methanol storage device can be achieved, and the stability and safety of the methanol storage device are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of methanol storage, in particular to a marine methanol fuel storage device. Background Art

[0002] Methanol fuel is a new type of clean fuel made by mixing industrial methanol or fuel methanol with denatured alcohol additives and existing national standard gasoline and diesel at a certain volume through strict scientific processes. It has an excellent cooling effect, which can reduce engine temperature and prevent overheating. It also has extremely high anti-knock ability and can burn at pressures higher than the allowable pressure of high-quality gasoline without detonation. Therefore, methanol fuel is becoming more and more widely used in dual-fuel ships.

[0003] Dual-fuel ships are usually equipped with fuel tanks to store methanol fuel. However, methanol fuel will breathe during the process of receiving, sending, and storing. At present, in order to ensure the dynamic balance of pressure in the fuel tank, a breathing valve is usually installed on the fuel tank. When the pressure in the fuel tank increases, the breathing valve opens to discharge the excess nitrogen in the fuel pipe. When the pressure in the fuel tank drops, the breathing valve opens to replenish nitrogen into the fuel tank. In related technologies, the breathing valve usually uses a spring to reset the pressure valve disc. After long-term use, the spring is prone to fatigue failure. When the spring fails, the staff cannot take corresponding measures in time. In addition, when the breathing valve fails, the fuel tank cannot adjust the pressure, affecting the stability and safety of methanol storage and use. Based on this, the present application proposes a marine methanol fuel storage device. Utility Model Content

[0004] The utility model provides a marine methanol fuel storage device, which solves the problem proposed in the above background technology that when a breathing valve is used to balance the pressure in the methanol fuel storage device, when the breathing valve fails, the staff cannot promptly understand and take corresponding measures, and the fuel tank cannot be pressure-regulated, which affects the stability and safety of methanol storage and use.

[0005] The utility model provides the following technical solution: a marine methanol fuel storage device, comprising a methanol storage device, wherein the methanol storage device is provided with a nitrogen sealing and venting structure, wherein the nitrogen sealing and venting structure comprises a normal working condition pressure control structure and an emergency working condition pressure control structure; the normal working condition pressure control structure comprises a nitrogen sealing structure and a nitrogen unloading structure, and the emergency working condition pressure control structure comprises a bursting disc venting structure and a manual emergency unloading structure;

[0006] The nitrogen sealing structure uses external nitrogen as a nitrogen source, and automatically supplies nitrogen to the methanol storage device through a nitrogen sealing valve. The opening and closing of the nitrogen sealing valve are adjusted according to the pressure of the methanol storage device. The nitrogen sealing structure includes a nitrogen inlet pipe connected to the methanol storage device, and a root stop valve is provided at one end of the nitrogen inlet pipe close to the methanol storage device. The other end of the nitrogen inlet pipe is provided with a nitrogen sealing valve, and pressure gauges are provided on both sides of the nitrogen sealing valve.

[0007] The nitrogen unloading structure includes a nitrogen discharge pipe, on which a nitrogen unloading valve and a root stop valve 3 are provided. The root stop valve 3 and the nitrogen unloading valve are connected in series to the nitrogen discharge pipe, and the root stop valve 3 is located on a side of the nitrogen unloading valve close to the methanol storage device. The methanol storage device is connected to the methanol gas recovery device on the ship through the nitrogen unloading structure.

[0008] The bursting disc ventilation structure includes a ventilation branch pipe 1 connected to the methanol storage device, and a two-way bursting disc and a root stop valve 2 are provided on the ventilation branch pipe 1. The root stop valve 2 and the two-way bursting disc are connected in series on the ventilation branch pipe 1, and the root stop valve 2 is located on the side of the ventilation branch pipe 1 away from the methanol storage device. Pressure differential sensors are provided at both ends of the two-way bursting disc; the manual emergency unloading structure includes a ventilation branch pipe 2 connected to the methanol storage device, and a manual unloading valve is provided on the ventilation branch pipe 2; the other ends of the ventilation branch pipe 1 and the ventilation branch pipe 2 are connected in parallel and connected to the ventilation main pipe.

[0009] Preferably, the root stop valve 2 is in a normally open state.

[0010] Preferably, the manual discharge valve is in a normally closed state.

[0011] Preferably, when the internal pressure of the methanol storage device is higher than a set value, the nitrogen discharge valve automatically opens to release the methanol gas to the methanol gas recovery device.

[0012] Preferably, the bidirectional bursting disc automatically opens when the positive / negative pressure reaches the bursting pressure and connects the methanol storage device with the main ventilation pipe.

[0013] Preferably, the pressure differential sensor alarms when the pressure in the methanol storage device increases / decreases suddenly and the bidirectional bursting disc fails but does not explode, or when the pressure in the methanol storage device is abnormal and the bidirectional bursting disc takes effect and automatically explodes.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. This marine methanol fuel storage device, based on the conventional methanol storage system, adds nitrogen sealing and ventilation structures. In the event of an emergency, the methanol storage device can automatically release pressure, improving the stability and safety of the methanol storage device.

[0016] 2. The ship's methanol fuel storage device features a bidirectional bursting disc that automatically opens when the pressure exceeds or falls below the set value, enabling immediate response. This also prevents operators from having to manually open the discharge valve in an emergency, preventing injuries and potential dangers caused by proximity to the methanol storage device, thereby improving safety. The device is also equipped with an emergency venting system that not only meets process requirements and production needs, but also serves as a double safeguard, controlling the emergency operating pressure in the event of a rupture disc venting structure failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structural principle of the utility model.

[0018] In the figure: 1. Pressure gauge; 2. Root stop valve 1; 3. Bidirectional bursting disc; 4. Differential pressure sensor; 5. Nitrogen sealing valve; 6. Manual unloading valve; 7. Nitrogen unloading valve; 8. Nitrogen inlet pipe; 9. Vent main pipe; 10. Nitrogen outlet pipe; 11. Root stop valve 2; 12. Root stop valve 3; 13. Methanol storage device; 14. Vent branch pipe 1; 15. Vent branch pipe 2; ①. Nitrogen sealing structure; ②. Bursting disc venting structure; ③. Manual emergency unloading structure; ④. Nitrogen unloading structure. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] The present invention provides a marine methanol fuel storage device, including a methanol storage device 13. The methanol storage device 13 is conventional and will not be described in detail herein. The methanol storage device 13 is provided with a nitrogen seal and a venting structure, which includes a normal operating pressure control structure and an emergency operating pressure control structure.

[0021] The normal operating pressure control structure includes a nitrogen sealing structure and a nitrogen unloading structure. The nitrogen sealing structure uses external nitrogen as the nitrogen source and automatically supplies nitrogen to the methanol storage device 13 through the nitrogen sealing valve 5. The opening and closing of the nitrogen sealing valve 5 are adjusted according to the pressure of the methanol storage device. The pressure is usually set at 1.5kPa.

[0022] The nitrogen sealing structure includes a nitrogen inlet pipe 8 connected to the methanol storage device 13. A root stop valve 2 is provided at one end of the nitrogen inlet pipe 8 close to the methanol storage device 13, and a nitrogen sealing valve 5 is provided at the other end of the nitrogen inlet pipe 8. Pressure gauges 1 are provided on both sides of the nitrogen sealing valve 5.

[0023] The nitrogen unloading structure includes a nitrogen discharge pipe 10, which is provided with a nitrogen unloading valve 7 and a root stop valve 3 12. The methanol storage device 13 is connected to the methanol gas recovery device on the ship through the nitrogen unloading structure. When the internal pressure of the methanol storage device 13 is higher than the set value, the nitrogen unloading valve automatically opens and releases the nitrogen to the methanol gas recovery device.

[0024] The emergency pressure control structure includes a bursting disc venting structure and a manual emergency unloading mechanism. The bursting disc venting structure enables immediate response to sudden pressure increases or decreases within the tank. It includes a venting branch pipe 14 connected to the methanol storage device 13. A bidirectional bursting disc 3 and a root shut-off valve 2 11 are mounted on this venting branch pipe 14. This venting branch pipe 14 is connected in series with the bidirectional bursting disc 3 and is located on the side of the venting branch pipe 14 away from the methanol storage device 13. This valve is normally open and can be manually closed in the event of accidental damage to ensure proper functioning of the nitrogen sealing and unloading mechanisms.

[0025] The other end of the ventilation branch pipe 14 is connected to the ventilation main pipe 9, and the bidirectional bursting disc 3 automatically opens when the positive / negative pressure reaches the bursting pressure and connects the methanol storage device 13 to the ventilation main pipe 9.

[0026] The bidirectional bursting disc 3 is a bursting disc product already available on the market. The manufacturer can be contacted to purchase a suitable model of bidirectional bursting disc according to the design working conditions to meet the technical requirements. A pressure differential sensor 4 is provided at both ends of the bidirectional bursting disc 3. The pressure differential sensor 4 can monitor the status of the bidirectional bursting disc 3, and the pressure differential sensor 4 alarms when the pressure in the methanol storage device 13 suddenly increases / decreases and the bidirectional bursting disc 3 fails but does not explode, or when the pressure in the methanol storage device 13 is abnormal and the bidirectional bursting disc 3 takes effect and automatically explodes.

[0027] The manual emergency relief structure includes a second ventilation branch pipe 15 connected to the methanol storage device 13, equipped with a manual relief valve 6. The other end of ventilation branch pipe 15 is connected to the ventilation main pipe 9, and the other end of ventilation branch pipe 14 is connected in parallel with the other end of ventilation branch pipe 15. The manual relief valve 6 is normally closed, serving as a backup relief method in emergencies. As a backup emergency venting system, the manual emergency relief structure not only meets process requirements and production needs, but also provides dual protection, controlling emergency operating pressure in the event of failure of the bursting disc venting structure.

[0028] Take the design condition of positive pressure 10kPa and negative pressure -5kPa as an example.

[0029] Select a bidirectional bursting disc 3 that meets the design working conditions and install it correctly. Arrange the differential pressure sensor 4 correctly at both ends of the bidirectional bursting disc 3. Connect a local stop valve 11 in series with the bidirectional bursting disc 3 to form a bursting disc ventilation structure.

[0030] The differential pressure sensor 4 is configured to automatically alarm when its output exceeds 10kPa or falls below -5kPa. It is also configured to automatically alarm when its output equals 0. The output of the differential pressure sensor 4 allows staff to determine the status of the bidirectional bursting disc 3 based on the value. When the differential pressure sensor 4 alarms, staff can take appropriate measures promptly.

[0031] When the output value of the differential pressure sensor 4 is greater than 10kPa or less than -5kPa, it means that the pressure in the methanol storage device has increased / decreased suddenly and the bidirectional bursting disc has failed (not exploded). At this time, the staff needs to manually open the manual unloading valve 6 to release the pressure in the methanol storage device 13; when the pressure in the tank is abnormal and the sensor output value is 0, it means that an emergency has occurred and the bidirectional bursting disc 3 has taken effect (automatically exploded). At this time, the staff needs to take corresponding measures, check the cause of the accident, and handle the emergency situation; when the pressure in the methanol storage device 13 is normal and the sensor output value is 0, it means that the bidirectional bursting disc 3 is damaged. At this time, the staff can close the root stop valve 2 11 to ensure the normal operation of the nitrogen sealing structure of the methanol storage device 13.

[0032] The bidirectional bursting disc 3 effectively replaces the manual relief valve 6, automatically opening when pressure exceeds or falls below a set value, providing immediate response. This also avoids the need for operators to manually open the relief valve in an emergency, potentially causing injuries and other potential dangers near the methanol storage device 13, thereby improving safety. Because the bidirectional bursting disc 3 is a mechanical structure, this component also ensures reliability.

[0033] To sum up: when the ship-borne methanol fuel storage device is in use, a nitrogen seal and a ventilation structure are added on the basis of the existing ship-borne methanol fuel storage device, so that in the event of an emergency, the methanol storage device 13 can automatically unload the pressure, thereby improving the stability and safety of the methanol storage device 13, and having a backup emergency ventilation system, which can not only meet the process requirements and production needs, but also serve as a double guarantee, and control the emergency working pressure when the bursting disc ventilation structure fails, thereby improving the reliability of the device and ensuring the stability and safety of the methanol fuel during storage and use.

[0034] The standard parts used in the present invention can all be purchased from the market, and special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the existing technology. The machinery, parts and equipment all adopt conventional models in the existing technology and will not be described in detail here. The content not described in detail in this specification belongs to the existing technology known to professional and technical personnel in this field. Although the embodiments of the present invention have been shown and described, it can be understood by ordinary technicians in this field that various changes, modifications, substitutions and modifications can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A methanol fuel storage device for a ship, comprising a methanol storage device (13), characterized in that: The methanol storage device (13) is provided with a nitrogen sealing and ventilation structure, wherein the nitrogen sealing and ventilation structure includes a normal working condition pressure control structure and an emergency working condition pressure control structure; the normal working condition pressure control structure includes a nitrogen sealing structure and a nitrogen unloading structure, and the emergency working condition pressure control structure includes a bursting disc ventilation structure and a manual emergency unloading structure; The nitrogen sealing structure uses external nitrogen as a nitrogen source, and adjusts the opening and closing of the nitrogen sealing valve (5) according to the pressure of the methanol storage device through the nitrogen sealing valve (5), thereby realizing automatic supply of nitrogen to the methanol storage device (13). The nitrogen sealing structure includes a nitrogen inlet pipe (8) connected to the methanol storage device (13), a root stop valve (2) is provided at one end of the nitrogen inlet pipe (8) close to the methanol storage device (13), and a nitrogen sealing valve (5) is provided at the other end of the nitrogen inlet pipe (8), and pressure gauges (1) are provided on both sides of the nitrogen sealing valve (5); The nitrogen discharge structure comprises a nitrogen discharge pipe (10), the nitrogen discharge pipe (10) is provided with a nitrogen discharge valve (7) and a root stop valve (12), the root stop valve (12) and the nitrogen discharge valve (7) are connected in series to the nitrogen discharge pipe (10), and the root stop valve (12) is located on a side of the nitrogen discharge valve (7) close to the methanol storage device (13), and the methanol storage device (13) is connected to the methanol gas recovery device on the ship through the nitrogen discharge structure; The bursting disc ventilation structure comprises a ventilation branch pipe (14) connected to the methanol storage device (13), a bidirectional bursting disc (3) and a root stop valve (11) provided on the ventilation branch pipe (14), the root stop valve (11) and the bidirectional bursting disc (3) are connected in series on the ventilation branch pipe (14), and the root stop valve (11) is located on the side of the ventilation branch pipe (14) away from the methanol storage device (13), and pressure differential sensors (4) are provided at both ends of the bidirectional bursting disc (3); the manual emergency unloading structure comprises a ventilation branch pipe (15) connected to the methanol storage device (13), a manual unloading valve (6) is provided on the ventilation branch pipe (15); the other ends of the ventilation branch pipe (14) and the ventilation branch pipe (15) are connected in parallel and connected to the ventilation main pipe (9).

2. A marine methanol fuel storage device according to claim 1, characterized in that: The root stop valve 2 (11) is in a normally open state.

3. A marine methanol fuel storage device according to claim 1, characterized in that: The manual discharge valve (6) is in a normally closed state.

4. A marine methanol fuel storage device according to claim 1, characterized in that: When the internal pressure of the methanol storage device (13) is higher than the set value, the nitrogen discharge valve (7) automatically opens to release the methanol gas to the methanol gas recovery device.

5. The marine methanol fuel storage device according to claim 1, characterized in that: The bidirectional bursting disc (3) automatically opens when the positive / negative pressure reaches the bursting pressure and connects the methanol storage device (13) with the main ventilation pipe (9).

6. The marine methanol fuel storage device according to claim 1, characterized in that: The pressure difference sensor (4) alarms when the pressure in the methanol storage device (13) increases / decreases suddenly and the bidirectional bursting disc (3) fails but does not explode, or when the pressure in the methanol storage device (13) is abnormal and the bidirectional bursting disc (3) takes effect and automatically explodes.

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