Ventilation overflow arrangement structure for methanol cabin of ship
By designing a breathable overflow layout structure with the top of the methanol discharge compartment lower than the daily use compartment in a methanol dual-fuel ship, the problems of complex layout, high cost and inconvenient construction in the prior art are solved, and the cost saving of pipe systems is achieved , construction simplification and safety overflow functions to improve.
Patent Information
- Application Number
- CN202411378661.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-30
- Publication Date
- 2024-12-27
AI Technical Summary
In existing methanol dual-fuel ships, the air permeability pipes of the methanol daily necessities and discharge chambers are complex in place, high costs, inconvenient construction, and are likely to affect personnel passage and lead to blockage of the air permeability pipe.
A new type of breathable overflow arrangement structure is designed. The top of the methanol discharge chamber is lower than that of the daily cabin. The breathable pipe is led out from the top and bent downward to the discharge chamber. The two pipes gather and then extend along the footbridge to share a breathable Valve realizes self-release and discharge function and simplifies construction.
The number and cost of breathable pipes is reduced, the construction process is simplified, the ventilation pipe is blocked and overpressurized in the cabin is avoided, and safety and convenience of passage are improved.
Smart Images
Figure CN119190264A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a ship arrangement structure, in particular to a methanol tank ventilation overflow arrangement structure, belonging to the technical field of ship design. Background Art
[0002] In recent years, as the International Maritime Organization has become more and more stringent on carbon emissions, some ships have gradually turned to methanol dual-fuel propulsion solutions. Methanol is liquid at room temperature and has a flash point of about 11°C, which is a low-flash point fuel. According to regulations, low-flash point fuel cannot be installed inside the ship's engine room, so methanol fuel storage tanks are usually installed in the ship's cargo hold area or above the deck. Figure 1 The green part in the middle. According to the requirements of the methanol propulsion system, in addition to the methanol storage tank, a methanol daily tank is also required in the engine room area near the ship for daily use of the methanol machine. In addition, a methanol discharge tank is required. When the methanol system fails, the methanol in the methanol supply pipe can be purged to the discharge tank to avoid leakage into the engine room and cause danger.
[0003] Since methanol is a low flash point fuel, its breathable valve usually brings a larger explosion hazard area, see Figure 2 In the middle hatched area, in order to avoid the dangerous ventilation area of the methanol tank affecting the living and working places on board, the methanol storage tank, methanol daily tank and methanol discharge tank usually adopt the centralized ventilation type and are far away from the aft superstructure area. At present, most ships are stern-engine type, with the engine room located at the stern. The methanol daily tank and discharge tank usually need to be set on the upper deck near the engine room area, and their ventilation pipes need to be led to the centralized ventilation area near the bow of the ship or away from the aft living and working places.
[0004] Figure 3 This is a typical ventilation scheme for the methanol daily tank and discharge tank of a liquid cargo ship. Due to the lower energy density of methanol, the volume of its daily tank is larger than that of the general fuel daily tank, and even the top of the daily tank will exceed the height of the liquid cargo ship's gangway. According to the conventional scheme, a ventilation pipe needs to be installed on the top of each methanol daily tank and discharge tank, extending toward the bow and gradually rising to facilitate liquid reflux and avoid overpressure in the cabin caused by blockage of the ventilation pipe.
[0005] The following problems exist in the existing arrangement of ventilation pipes: 1. There are many ventilation pipes and the cost is high; 2. In order to avoid affecting the normal passage of people on the footbridge, the ventilation pipes need to be more than 2 meters higher than the footbridge; 3. The construction is inconvenient, especially the ventilation pipes above the footbridge require additional brackets for support and fixation. Summary of the invention
[0006] The purpose of the present invention is to simplify the ventilation type of the methanol daily tank and the methanol discharge tank, reduce ventilation pipes and ventilation valves, reduce costs and simplify construction technology.
[0007] The present invention adopts the following technical solutions:
[0008] A methanol tank ventilation overflow arrangement structure for a ship comprises a methanol daily tank and a methanol discharge tank, wherein the top of the methanol discharge tank is lower than the top of the methanol daily tank; the ventilation pipe of the methanol discharge tank is led out from the top, the ventilation pipe of the methanol daily tank is led out from the top or the side, then bent downward and connected to the ventilation pipe of the discharge tank, and the two ventilation pipes are connected together and extend along a pipe bracket arranged under a gangway toward the bow or stern away from a residential area; a ventilation valve is arranged at the end of the ventilation pipe.
[0009] Preferably, the living area is arranged at the stern, and the ventilation pipe extends toward the bow.
[0010] Preferably, the lower portion of the methanol daily tank has a notch, and the methanol discharge tank is arranged in the notch, so that the two tanks have an integrated structure in overall appearance.
[0011] Preferably, the top of the methanol daily tank is higher than the gangway, and the top of the methanol discharge tank is lower than the gangway.
[0012] Furthermore, the methanol daily tank and the methanol discharge tank are fixedly arranged on the upper deck.
[0013] Preferably, the end of the air vent tube extends vertically upward, and the air vent valve is arranged at a high position.
[0014] Preferably, the ventilation pipe of the methanol daily tank is also led out from the top.
[0015] Preferably, a three-way connection is provided at the position where the two ventilation pipes are joined together, so that the ventilation pipe of the methanol daily tank and the ventilation pipe of the methanol discharge tank are in two directions, vertical and horizontal, at the intersection.
[0016] The beneficial effects of the present invention are:
[0017] 1) The two vent pipes are combined and extended toward the bow. Since the top of the methanol discharge tank is lower than the gangway, the combined vent pipe can be provided with a pipe bracket along the gangway. Since the two vent pipes are combined into one, only one vent valve is needed to meet the ventilation needs of the two tanks, which saves vent pipe materials and reduces costs.
[0018] 2) It is only necessary to fix the ventilation pipe under the footbridge, which solves the support problem of the ventilation pipe above the footbridge and will not affect the passage of people on the footbridge;
[0019] 3) Since methanol is a liquid at room temperature, when overflow occurs in the daily use tank, the methanol liquid can flow directly to the methanol discharge tank without causing blockage of the vent pipe and increasing the pressure in the tank. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 This is a schematic diagram of an existing ship with a methanol fuel storage tank. This diagram is only for appearance display and is not used as a technical solution. The two cylinders (green) lying in the middle are methanol tanks.
[0021] Figure 2 This is the main view of an existing ship with a methanol fuel storage tank. The shaded area indicates that the vent valve usually brings a larger explosion hazard area.
[0022] Figure 3 This is a typical ventilation scheme for the methanol daily tank and discharge tank of an existing liquid cargo ship. Due to the lower energy density of methanol, the volume of its daily tank is larger than that of the general fuel daily tank, and even the top of the daily tank will exceed the height of the liquid cargo ship's gangway. According to this conventional scheme, a ventilation pipe needs to be installed on the top of each methanol daily tank and discharge tank, extending toward the bow and gradually rising to facilitate liquid reflux and avoid overpressure in the cabin caused by blockage of the ventilation pipe.
[0023] Figure 4 It is a schematic diagram of the ventilation overflow arrangement structure of the methanol tank of a ship according to the present invention. DETAILED DESCRIPTION
[0024] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.
[0025] Embodiment 1 (comparative embodiment):
[0026] This embodiment is a typical ventilation scheme for a methanol daily tank and a discharge tank of a liquid cargo ship in the prior art, see Figure 3 Due to the low energy density of methanol, the volume of its daily tank is larger than that of general fuel oil daily tank, and even the top of the daily tank may exceed the height of the liquid cargo ship's gangway. According to this conventional scheme, a vent pipe needs to be installed on the top of each methanol daily tank and discharge tank, extending toward the bow and gradually rising to facilitate liquid reflux and avoid overpressure in the tank caused by clogging of the vent pipe by liquid.
[0027] Embodiment 2:
[0028] First, the main technical problem to be solved by the present invention is that methanol dual-fuel ships need to be equipped with methanol daily tanks and discharge tanks near the engine room area. Since methanol is a low-flash point fuel, the dangerous area is relatively large, so its ventilation pipe usually needs to be installed in an area far away from living and working places. The ventilation pipe is usually led out from the top of the tank and gradually rises to facilitate liquid reflux, so as to have a self-draining function to avoid liquid blocking the ventilation pipeline and causing overpressure in the cabin. Based on this, the present invention designs a new methanol tank ventilation / overflow type, which solves the layout, ventilation and overflow problems of the methanol daily tank and methanol discharge tank arranged on the ship deck. The specific description is as follows:
[0029] This embodiment is a preferred embodiment of the present invention. The ventilation type of the new methanol tank is as follows Figure 4 The ship's methanol tank ventilation overflow arrangement structure includes a methanol daily tank and a methanol discharge tank, the top of the methanol discharge tank is lower than the top of the methanol daily tank; the ventilation pipe of the methanol discharge tank is led out from the top, the ventilation pipe of the methanol daily tank is led out from the top or the side, then bent downward and connected to the ventilation pipe of the discharge tank, and the two ventilation pipes are gathered together and extended along the pipe bracket arranged under the gangway toward the bow or stern away from the residential area; the end of the ventilation pipe extends vertically upward, and the ventilation valve is arranged at a high position.
[0030] The living area is arranged at the stern, and the ventilation pipe extends toward the bow.
[0031] In this embodiment, see Figure 4 The methanol daily tank has a notch on its lower exterior, and the methanol discharge tank is arranged in the notch, so that the overall exterior of the two tanks presents an integrated structure.
[0032] Continue to see Figure 4 The top of the methanol daily tank is higher than the gangway, and the top of the methanol discharge tank is lower than the gangway. The methanol daily tank and the methanol discharge tank are fixedly arranged on the upper deck.
[0033] See also Figure 4 A three-way connection is provided at the position where the two ventilation pipes are joined together, and the ventilation pipe of the methanol daily tank and the ventilation pipe of the methanol discharge tank are arranged in two directions, vertically and horizontally, at the intersection.
[0034] In this embodiment, the top of the methanol discharge tank is lower than the methanol daily tank, and the ventilation pipes of the two tanks are respectively led out from the top. Among them, the ventilation pipe of the methanol daily tank is led out from the top and then bends downward and is connected to the ventilation pipe of the discharge tank. The two ventilation pipes are gathered together and extend toward the bow. Since the top of the methanol discharge tank is lower than the gangway, the combined ventilation pipe can be provided with a pipe bracket along the gangway, which not only saves the ventilation pipe material, but also can meet the ventilation needs of the two liquid tanks with only one ventilation valve at the end, reducing the equipment cost. At the same time, since only the ventilation pipe under the gangway needs to be fixed, the support problem of the ventilation pipe above the gangway is solved, and it will not affect the passage of personnel on the gangway. Since methanol is a liquid at room temperature, when the daily tank overflows, the methanol liquid can flow to the methanol discharge tank, and will not cause the ventilation pipe to be blocked and cause the pressure in the cabin to increase.
[0035] The present invention integrates the ventilation pipes of the methanol daily tank and the discharge tank together, saves the piping cost, reduces the equipment cost, simplifies the construction process, and the main key technical points are as follows:
[0036] 1) The relative height arrangement of methanol daily tank and discharge tank;
[0037] 2) The ventilation pipes of the two tanks are led out and connected in parallel, and the two tanks have a self-draining function after being connected, and the methanol daily tank has a safety overflow function;
[0038] 3) The relative position of the vent pipe and the step bridge after connection;
[0039] 4) Two cabins share one ventilation valve.
[0040] In summary, the present invention has the following innovations:
[0041] [Save costs on pipes and vent valves]: After the two vent pipes are combined, they extend toward the bow. Since the top of the methanol discharge tank is lower than the gangway, the combined vent pipe can be equipped with a pipe bracket along the gangway. Since the two vent pipes are combined into one, only one vent valve is needed to meet the ventilation needs of the two tanks, which saves vent pipe materials and reduces costs.
[0042] [Simplified construction process]: Only the ventilation pipe under the footbridge needs to be fixed, which solves the support problem of the ventilation pipe above the footbridge and will not affect the passage of people on the footbridge;
[0043] [Added a safe overflow function for the methanol daily tank]: Since methanol is a liquid at room temperature, when an overflow occurs in the daily tank, the methanol liquid can flow directly to the methanol discharge tank without causing the air vent pipe to be blocked and causing the pressure in the tank to increase.
[0044] The above are preferred embodiments of the present invention. Those skilled in the art may also make respective changes or improvements thereon. Without departing from the general concept of the present invention, these changes or improvements shall fall within the scope of protection claimed by the present invention.
Claims
1. A ship methanol tank ventilation overflow arrangement structure, characterized in that: It includes a methanol daily tank and a methanol discharge tank, and the top of the methanol discharge tank is lower than the top of the methanol daily tank; The ventilation pipe of the methanol discharge tank is led out from the top, and the ventilation pipe of the methanol daily tank is led out from the top or the side, then bent downward and connected to the ventilation pipe of the discharge tank. After the two ventilation pipes are gathered together, they extend along the pipe bracket arranged under the gangway toward the bow or stern away from the residential area; a ventilation valve is arranged at the end of the ventilation pipe.
2. The ship methanol tank ventilation overflow arrangement structure according to claim 1, characterized in that: The living area is arranged at the stern, and the ventilation pipe extends toward the bow.
3. The ship methanol tank ventilation overflow arrangement structure according to claim 1, characterized in that: The methanol daily tank has a notch on its lower outer shape, and the methanol discharge tank is arranged in the notch, so that the two tanks have an integrated structure in their overall appearance.
4. The ship methanol tank venting overflow arrangement structure according to claim 1, characterized in that: The top of the methanol daily tank is higher than the gangway, and the top of the methanol discharge tank is lower than the gangway.
5. The ship methanol tank ventilation overflow arrangement structure according to claim 4, characterized in that: The methanol daily tank and the methanol discharge tank are fixedly arranged on the upper deck.
6. The ship methanol tank venting overflow arrangement structure according to claim 1, characterized in that: The end of the ventilation tube extends vertically upward, and the ventilation valve is arranged at a high position.
7. The ship methanol tank ventilation overflow arrangement structure according to claim 1, characterized in that: The ventilation pipe of the methanol daily cabin is also led out from the top.
8. The ship methanol tank venting overflow arrangement structure according to claim 1, characterized in that: A three-way connection is arranged at the position where the two ventilation pipes are brought together, so that the ventilation pipe of the methanol daily tank and the ventilation pipe of the methanol discharge tank are in two directions, vertical and horizontal, at the intersection.