Ventilation overflow arrangement structure for methanol cabin of ship
By designing the breathable pipes of the methanol daily necessities and discharge chambers into an integrated structure, the problems of many breathable pipes, high costs and inconvenient construction are solved, cost savings and construction simplification are achieved, while avoiding the impact of blockage of breathable pipes and safe passage.
Patent Information
- Application Number
- CN202422394487.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-30
- Publication Date
- 2025-08-19
- Estimated Expiration
- 2034-09-30
AI Technical Summary
The existing methanol fuel ships have many breathable pipes, high costs, and are inconvenient to construction. In particular, the breathable pipe needs additional support and fixation above the step bridge, and there is a risk of air permeability pipe blockage.
The breathable pipes of the methanol daily necessity compartment and the discharge compartment are designed as an integrated structure. The breathable pipes gathered and extended along the footbridge, and a breathable valve is used. The top of the methanol daily necessity compartment is lower than the daily necessity compartment. The breathable pipe is fixed under the footbridge to avoid being higher than the footbridge and simplify construction.
It saves the material and equipment costs of the breathable pipe, simplifies the construction process, avoids the blockage of the breathable pipe, and ensures safe passage of personnel.
Smart Images
Figure CN223237853U_ABST
Abstract
Description
Technical Field
[0001] The utility model 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 tightened its carbon emission requirements, 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, making it a low-flashpoint fuel. According to regulations, low-flashpoint fuel cannot be stored inside the ship's engine room, so methanol fuel storage tanks are usually located in the ship's cargo hold area or above the deck. Figure 1 The green area 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 near the ship's engine room area for daily use of the methanol machinery. In addition, a methanol drain tank is required. In the event of a methanol system failure, methanol in the methanol supply pipe can be purged into the drain tank to prevent dangerous leakage into the engine room.
[0003] Since methanol is a low flash point fuel, its vent valve usually brings a large explosion hazard area. Figure 2 To avoid the impact of the methanol tank's ventilation danger zone on the ship's living and working spaces, the methanol storage tank, methanol service tank, and methanol dump tank are usually designed with centralized ventilation and are located away from the aft superstructure area. Currently, most ships are stern-engine type, with the engine room located at the aft. The methanol service tank and dump tank are usually installed 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 spaces.
[0004] Figure 3 This is a typical ventilation scheme for the methanol service tanks and discharge tanks of a liquid cargo ship. Due to the lower energy density of methanol, the volume of its service tanks is larger than that of general fuel oil service tanks. The top of the service tanks may even exceed the height of the liquid cargo ship's gangway. According to the conventional scheme, a vent pipe is required on the top of each methanol service tank and discharge tank, extending toward the bow and gradually rising to facilitate liquid backflow and avoid overpressure in the tank caused by vent pipe blockage.
[0005] The following problems exist with the existing arrangement of ventilation pipes: 1. There are many ventilation pipes and the cost is high; 2. 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. Construction is inconvenient, especially the ventilation pipes above the footbridge require additional brackets for support and fixation. Utility Model Content
[0006] The utility model aims to simplify the ventilation types of a methanol daily tank and a methanol discharge tank, reduce ventilation pipes and ventilation valves, reduce costs and simplify construction technology.
[0007] The utility model 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 bends downward and is connected to the ventilation pipe of the discharge tank; the two ventilation pipes are connected together and extend along a pipe bracket provided under a gangway toward the bow or stern of the ship away from the residential area; and a ventilation valve is provided 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 ventilation tube extends vertically upward, and the ventilation valve is provided at a high position.
[0014] Preferably, the ventilation pipe of the methanol daily tank is also led out from the top.
[0015] Preferably, a tee is provided at the location where the two ventilation pipes are brought together, and the ventilation pipe of the methanol daily tank and the ventilation pipe of the methanol discharge tank are arranged 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 supported along the gangway. Since the two vent pipes are combined into one, only one vent valve is needed to meet the ventilation needs of both tanks, saving vent pipe materials and reducing costs.
[0018] 2) Only the ventilation pipe under the bridge needs to be fixed, which solves the problem of supporting the ventilation pipe above the bridge and does not affect the passage of people on the bridge;
[0019] 3) Since methanol is a liquid at room temperature, when overflow occurs in the daily service 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 front view of an existing ship with a methanol fuel storage tank. The shaded area indicates the larger explosion hazard zone where the vent valve typically creates a large area.
[0021] Figure 2 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 also larger than that of the general fuel oil daily tank. The top of the daily tank may even 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 tank of the methanol daily tank and the discharge tank, extending toward the bow and gradually rising to facilitate liquid backflow and avoid overpressure in the tank caused by blockage of the ventilation pipe.
[0022] Figure 3 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
[0023] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.
[0024] Example 1 (comparative example):
[0025] This embodiment is a typical ventilation scheme for the methanol daily tank and the discharge tank of a liquid cargo ship in the prior art. Figure 2 Due to the low energy density of methanol, the volume of its daily tank is larger than that of general fuel oil daily tank. The top of the daily tank may even exceed the height of the liquid cargo ship's gangway. According to this conventional plan, 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.
[0026] Example 2:
[0027] 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-flashpoint fuel, the dangerous area is relatively large, so its ventilation pipe usually needs to be installed in an area 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 and avoid liquid blocking the ventilation pipe 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:
[0028] This embodiment is a preferred embodiment of the present utility model. The ventilation type of the new methanol tank is as follows: Figure 3The ship's methanol tank ventilation overflow arrangement 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 methanol discharge tank's ventilation pipe is led out from the top. The methanol daily tank's ventilation pipe is led out from the top or side, then bends downward and connects to the discharge tank's ventilation pipe. The two ventilation pipes are connected together and extend along a pipe bracket provided below the gangway toward the bow or stern of the ship, away from the residential area. The distal end of the ventilation pipe extends vertically upward, and the ventilation valve is provided at a high position.
[0029] The living area is arranged at the stern, and the ventilation pipe extends toward the bow.
[0030] In this embodiment, see Figure 3 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 overall outer shape of the two tanks is an integrated structure.
[0031] Continue to see Figure 3 The top of the methanol daily service tank is higher than the gangway, and the top of the methanol discharge tank is lower than the gangway. The methanol daily service tank and the methanol discharge tank are fixedly arranged on the upper deck.
[0032] See also Figure 3 A tee is set at the location where the two ventilation pipes converge, and the ventilation pipe of the methanol daily tank and the ventilation pipe of the methanol discharge tank are made to be in two directions, vertical and horizontal, at the intersection.
[0033] In this embodiment, the top of the methanol discharge tank is lower than the methanol service tank, and the ventilation pipes of both tanks exit from the top. The ventilation pipe of the methanol service tank bends downward from the top and connects to the ventilation pipe of the discharge tank. The two ventilation pipes are then combined and extended toward the bow. Since the top of the methanol discharge tank is lower than the gangway, a pipe support can be installed along the gangway. This not only saves ventilation pipe material, but also allows a single ventilation valve at the end to meet the ventilation needs of both tanks, reducing equipment costs. Furthermore, since only the ventilation pipe below the gangway needs to be fixed, the ventilation pipe above the gangway is no longer required, and the passage of personnel on the gangway is not affected. Since methanol is a liquid at room temperature, if the service tank overflows, the methanol liquid can flow into the methanol discharge tank, without clogging the ventilation pipe and increasing the cabin pressure.
[0034] This utility model integrates the ventilation pipes of the methanol daily tank and the discharge tank, saving piping costs, reducing equipment costs, and simplifying construction technology. The main key technical points are as follows:
[0035] 1) The relative height arrangement of methanol service tanks and discharge tanks;
[0036] 2) The ventilation pipes of the two tanks are led out in the same way and connected in parallel. The two tanks are equipped with self-draining function after connection, and the methanol daily service tank is equipped with a safety overflow function.
[0037] 3) The relative position of the vent pipe and the step bridge after connection;
[0038] 4) Two compartments share one vent valve.
[0039] In summary, the present invention has the following innovations:
[0040] [Saves costs on piping and vent valves]: 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 supported along the gangway. Since the two vent pipes are combined into one, only one vent valve is required to meet the ventilation needs of both tanks, saving vent pipe materials and reducing costs.
[0041] [Simplified construction process]: Only the ventilation pipe under the footbridge needs to be fixed, which solves the problem of supporting the ventilation pipe above the footbridge and does not affect the passage of people on the footbridge;
[0042] [Added methanol daily tank safety overflow function]: Since methanol is a liquid at room temperature, when the daily tank overflows, the methanol liquid can flow directly to the methanol discharge tank without causing the vent pipe to be blocked and the pressure in the tank to increase.
[0043] The above are preferred embodiments of the present invention. Ordinary technicians in this field can also make their own changes or improvements on this basis. Without departing from the overall concept of the present invention, these changes or improvements should fall within the scope of protection required by the present invention.
Claims
1. A ship methanol tank ventilation overflow arrangement structure, characterized by: It includes a methanol daily service tank and a methanol discharge tank, and the top of the methanol discharge tank is lower than the top of the methanol daily service 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 side, then bent downward and connected to the ventilation pipe of the discharge tank. After the two ventilation pipes are combined together, they extend along the pipe bracket set under the gangway toward the bow or stern away from the residential area; a ventilation valve is set 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 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 are an integrated structure in overall appearance.
4. The ship methanol tank ventilation 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 venting and overflowing 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 ventilation overflow arrangement structure according to claim 1, characterized in that: A tee is provided at the location where the two ventilation pipes are brought together, and the ventilation pipe of the methanol daily tank and the ventilation pipe of the methanol discharge tank are arranged in two directions, vertical and horizontal, at the intersection.