Double-layer filling station of methanol filling ship

Abstract

The utility model discloses a double-layer filling station of a methanol filling ship, and belongs to the technical field of methanol water storage, transportation and filling. A storage chamber is arranged on a ship main deck of the filling station, a lower-layer filling station is arranged on the ship main deck, an upper-layer filling station is arranged on the storage chamber, and the upper-layer filling station is 3-5 meters higher than the lower-layer filling station. The double-layer high-low-position filling station with the high filling compatibility can flexibly meet the requirement that a filling ship is matched and compatible with more filled ships, and the filling safety and the market share are fully guaranteed. The single-time filling operation time is shortened, the effective operation time of the ship is prolonged in the economical aspect, and earnings are increased.

Description

Technical Field

[0001] The utility model relates to a double-layer filling station for a methanol filling ship, and belongs to the technical field of methanol water storage, transportation and filling. Background Art

[0002] Against the backdrop of the International Maritime Organization (IMO) greenhouse gas (GHG) emission reduction strategy, the EU's inclusion of the shipping industry in the EU ETS and FuelEU Maritime regulations, and the rapid advancement of the domestic dual-carbon strategy, methanol, as a future-oriented marine fuel, has good economy, safety and mature engine technology, making it gradually become one of the ideal fuels for ships to achieve low-carbon or carbon neutrality goals. It is gradually recognized by the shipping industry, and more and more ships will choose methanol as a marine fuel. The ensuing methanol fuel refueling operation is about to become a common problem faced by the industry.

[0003] Methanol bunkering ships have the characteristics of high maneuverability, large bunkering volume, high bunkering efficiency, and strong applicability. They are suitable for bunkering operations at coastal docks or anchorages, and can also carry out methanol bunkering and loading and unloading operations simultaneously. They will be the mainstream method of coastal methanol bunkering in the future. Typical ship-to-ship bunkering solution Figure 1 As shown: In order to adapt to the changes in the floating state of the two ships during the bunkering process, the minimum length of the hose should be calculated according to the actual situation to avoid the adverse effects caused by the stretching of the hose when the height difference between the two ships' manifolds is large. At the same time, the hose should be prevented from entering the water during the bunkering process. Moreover, the bunkering hoses are all single hoses to reduce the risk of connection leakage. The length selection of the bunkering hose must take into account factors such as the height difference of the manifolds under the most extreme conditions of the two ships, the minimum bending radius of the hose, and the vertical and lateral movement of the ship. The situation when the absolute value of the height difference between the manifolds of the two ships is the largest is selected as the analysis scenario for the selection of the hose length, and two working conditions are considered:

[0004] a) The relative positions of the two ships are such that the bending parts of the hoses are in the shape of a minimum bending arc;

[0005] b) When considering the maximum safe relative motion value of the two ships, the relative positions of the two ships make the bending parts of the hose present the minimum bending arc shape.

[0006] Since the types of methanol fuel receiving ships are different, the ship sizes are different, and the heights of the receiving stations are also quite different. The receiving stations of most bulk carriers are located at the stern and those of large container ships are located at the bow. It is a huge challenge to design a compatible filling station for most types of ships. The existing filling stations are all single-layer designs. When the height difference is too large, the filling hose is too long and it is very inconvenient to operate. The bending radius of the hose is limited, and it is easy to damage the hose if it is too long. In addition, when the height difference is too large, it affects the filling efficiency. The maximum filling flow rate of methanol liquid is controlled below 7 meters / second. Usually, the time from the start to the end of the filling operation is about 10 hours (excluding the preparation time for ship mooring, installation of hoses, etc.). If the filling time increases too much, the shipowner of the receiving ship will not accept it. Summary of the invention

[0007] In order to solve the problems existing in the prior art, the utility model provides a double-layer filling station for methanol-filling ships, which effectively solves the pain point that the filling operation of the filling ship is limited in adjusting its own ballast draft under certain working conditions, and the length of a single hose does not meet the requirements of the technical specifications for safe work. In particular, it has better compatibility with special receiving ship types.

[0008] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0009] A double-layer filling station for methanol filling ships, wherein a storage room is arranged on the main deck of the ship, a lower filling station is arranged on the main deck of the ship, an upper filling station is arranged on the storage room, and the upper filling station is 3-5 meters higher than the lower filling station;

[0010] The lower filling station includes a first lower filling header, a first lower air return header, a second lower filling header and a second lower air return header; in the lower filling station, a first liquid collecting tray is arranged on the main deck of the ship through a first fixed bracket, and a filling joint and an air return joint are arranged above the first liquid collecting tray;

[0011] The upper filling station includes a first upper filling header, a first upper return air header, a second upper filling header and a second upper return air header; in the upper filling station, a second liquid collecting pan is arranged on the side wall of the storage chamber through a second fixing bracket, and a filling joint and a return air joint are arranged above the second liquid collecting pan;

[0012] The return air manifolds in the lower filling station and the upper filling station are connected to the return air main pipe through valves, and the filling manifolds in the lower filling station and the upper filling station are connected to the filling main pipe through valves, and the use of the lower filling station or the upper filling station is controlled by valve switching.

[0013] Furthermore, a first lower-layer filling joint is provided at both ends of the first lower-layer filling manifold, a first lower-layer return air joint is provided at both ends of the first lower-layer return air manifold, a second lower-layer filling joint is provided at both ends of the second lower-layer filling manifold, and a second lower-layer return air joint is provided at both ends of the second lower-layer return air manifold.

[0014] Furthermore, a first upper filling joint is provided at both ends of the first upper filling manifold, a first upper air return joint is provided at both ends of the first upper air return manifold, a second upper filling joint is provided at both ends of the second upper filling manifold, and a second upper air return joint is provided at both ends of the second upper air return manifold.

[0015] Further, the first lower-layer filling manifold is connected to the first filling main pipe through a first lower-layer filling valve, the first lower-layer return air manifold is connected to the first return air main pipe through a first lower-layer return air valve, the second lower-layer filling manifold is connected to the second filling main pipe through a second lower-layer filling valve, and the second lower-layer return air manifold is connected to the second return air main pipe through a second lower-layer return air valve.

[0016] Further, the first upper filling manifold is connected to the first filling main pipe through a first upper filling valve, the first upper return air manifold is connected to the first return air main pipe through a first upper return air valve, the second upper filling manifold is connected to the second filling main pipe through a second upper filling valve, and the second upper return air manifold is connected to the second return air main pipe through a second upper return air valve.

[0017] Furthermore, the first liquid collecting tray and the second liquid collecting tray are connected to the discharge chamber through a discharge pipe.

[0018] Furthermore, a first lower filling joint, a first lower air return joint, a second lower filling joint and a second lower air return joint are arranged above the first liquid collecting tray.

[0019] Furthermore, a first upper filling joint, a first upper air return joint, a second upper filling joint and a second upper air return joint are arranged above the second liquid collecting tray.

[0020] Furthermore, nitrogen valves are provided on the filling manifold and the return air manifold in the lower filling station and the filling manifold and the return air manifold in the upper filling station.

[0021] Furthermore, sampling valves are provided on the filling headers in the lower filling station and the upper filling station, and discharge valves are provided on the return air headers in the lower filling station and the upper filling station.

[0022] Ball valves with quick connectors are installed on the left and starboard sides of the bunkering manifold for connecting inert gas to purge and inertize the bunkering pipeline.

[0023] The upper and lower gas phase pipes and liquid phase pipes are respectively connected to the filling main pipe and the return air main pipe through valves, and the high and low position filling are switched through valves (butterfly valves).

[0024] Compared with the prior art, this patent has the following advantages:

[0025] 1) Flexible and highly compatible. This double-layer high-low position filling station can be adapted to receiving ships and filling docks of different heights.

[0026] 2) High redundancy. Double-layer high and low-level filling stations are mutually redundant.

[0027] 3) Low risk. The upper filling station is located above, which protects the lower filling station, reduces the risk of damage and improves safety.

[0028] 4) Low cost. The filling station has a simple layout and uses the space of the storage room, so the production cost is low.

[0029] 5) Easy to build. The bunkering station has a simple layout and is easy to build on board.

[0030] 6) Strong versatility. This filling station is located on the open deck, which is easy to install and can also be used for filling LNG, ammonia fuel, etc. in the future.

[0031] The bunkering station is a double-layer high-low position bunkering station with flexible use, low investment and strong bunkering compatibility. It can flexibly meet the requirements of bunkering ships without adjusting the ballast draft, making it more adaptable to various types of receiving ships and docks. It can match and be compatible with more receiving ships, fully guaranteeing the safety and market share of bunkering. It shortens the single bunkering operation time, and in terms of economy, it increases the effective operation time of the ship and increases the revenue. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0033] Figure 1 It is a schematic diagram of ship-to-ship bunkering.

[0034] Figure 2 The system diagram of a double-deck filling station for methanol-filling ships.

[0035] Figure 3 This is a top view of the upper filling station.

[0036] Figure 4 This is a top view of the lower level filling station.

[0037] Figure 5 A front view of a double-deck bunkering station for methanol bunkering ships.

[0038] Figure 6 A side view of a double-deck bunkering station for methanol bunkering ships.

[0039] Figure 7 It is the connection diagram of the filling hose

[0040] In the figure: 1, ship main deck, 2, first liquid collecting tray, 3, first lower filling header, 3a, first lower filling joint, 3b, first lower filling valve, 4, first lower air return header, 4a, first lower air return joint, 4b, first lower air return valve, 5, second lower filling header, 5a, second lower filling joint, 5b, second lower filling valve, 6, second lower air return header, 6a, second lower air return joint, 6b, second lower air return valve, 7, first fixed support frame, 8, storage room, 9, second liquid collecting tray, 10, second fixed support frame, 11, first upper filling header, 1 1a, first upper filling joint, 11b, first upper filling valve, 12, first upper air return manifold, 12a, first upper air return joint, 12b, first upper air return valve, 13, second upper filling manifold, 13a, second upper filling joint, 13b, second upper filling valve, 14, second upper air return manifold, 14a, second upper air return joint, 14b, second upper air return valve, 15, first air return main pipe, 16, first filling main pipe, 17, second filling main pipe, 18, second air return main pipe, 19, nitrogen connecting valve, 20, discharge valve, 21, sampling valve, 22, discharge chamber. DETAILED DESCRIPTION

[0041] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0042] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention: the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0044] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below their position devices or structures". Thus, the exemplary term "above" may include both "above" and "below". The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0045] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0046] like Figure 1 The main function of the methanol filling station on the bunkering ship is to connect with the methanol fuel-powered ship (also known as the receiving ship filling station) through a hose, transport the methanol fuel to the receiving ship's methanol storage tank through a transfer pipeline, and at the same time discharge the mixed gas of methanol vapor and inert gas in the receiving ship's methanol storage tank back to the bunkering ship, and maintain the inert state and tank pressure of the entire methanol fuel system. When the tank pressure is too high, the high-speed breathable valve on the bunkering ship opens to release the pressure. The methanol storage tank is a container for storing methanol fuel.

[0047] Figures 2 to 6 A double-layer filling station for a methanol filling ship is shown, in which a storage room 8 is arranged on the main deck 1 of the ship, a lower filling station is arranged on the main deck 1 of the ship, and an upper filling station is arranged on the storage room 8, and the upper filling station is 3-5 meters higher than the lower filling station;

[0048] The lower filling station includes a first lower filling manifold 3, a first lower air return manifold 4, a second lower filling manifold 5, and a second lower air return manifold 6; first lower filling joints 3a are provided at both ends of the first lower filling manifold 3, first lower air return joints 4a are provided at both ends of the first lower air return manifold 4, second lower filling joints 5a are provided at both ends of the second lower filling manifold 5, and second lower air return joints 6a are provided at both ends of the second lower air return manifold 6. In the lower filling station, the first liquid collecting tray 2 is arranged on the main deck 1 of the ship through the first fixed bracket 7, and the first lower filling joint 3a, the first lower air return joint 4a, the second lower filling joint 5a, and the second lower air return joint 6a are arranged above the first liquid collecting tray 2.

[0049] The upper filling station includes a first upper filling manifold 11, a first upper air return manifold 12, a second upper filling manifold 13, and a second upper air return manifold 14; first upper filling joints 11a are arranged at both ends of the first upper air return manifold 12, first upper air return joints 12a are arranged at both ends of the first upper air return manifold 12, second upper filling joints 13a are arranged at both ends of the second upper filling manifold 13, and second upper air return joints 14a are arranged at both ends of the second upper air return manifold 14. In the upper filling station, the second liquid collecting tray 9 is arranged on the side wall of the storage chamber 8 by means of a second fixed bracket 10, and the first upper filling joint 11a, the first upper air return joint 12a, the second upper filling joint 13a, and the second upper air return joint 14a are arranged above the second liquid collecting tray 9.

[0050] The first lower filling manifold 3 is connected to the first filling main pipe 16 through the first lower filling valve 3b, the first lower return air manifold 4 is connected to the first return air main pipe 15 through the first lower return air valve 4b, the second lower filling manifold 5 is connected to the second filling main pipe 17 through the second lower filling valve 5b, and the second lower return air manifold 6 is connected to the second return air main pipe 18 through the second lower return air valve 6b.

[0051] The first upper filling manifold 11 is connected to the first filling main pipe 16 through the first upper filling valve 11b, the first upper return air manifold 12 is connected to the first return air main pipe 15 through the first upper return air valve 12b, the second upper filling manifold 13 is connected to the second filling main pipe 17 through the second upper filling valve 13b, and the second upper return air manifold 14 is connected to the second return air main pipe 18 through the second upper return air valve 14b.

[0052] The return air headers in the lower filling station and the upper filling station are connected to the return air main pipe through valves, and the filling headers in the lower filling station and the upper filling station are connected to the filling main pipe through valves. The lower filling station or the upper filling station is used through valve switching control.

[0053] The first liquid collecting tray 2 and the second liquid collecting tray 9 are connected to the discharge tank 22 through a discharge pipe. In order to prevent the risk of leakage during the filling of methanol fuel, a filling station liquid collecting tray is designed below the filling station. The leaked methanol fuel is collected by the filling station liquid collecting tray and stored in the discharge tank. The methanol discharge pipe is connected to the discharge tank, and the head end of the injection pipe is connected to the shore-based methanol fuel station or the filling station of the methanol supply ship through a hose, and the end is connected to the methanol storage tank of the receiving ship, so that the methanol fuel is transported to the storage tank for storage, and the methanol leaked during the filling process is transported to the discharge tank or cabinet for storage.

[0054] Nitrogen valves 19 are provided on the filling manifold and return air manifold in the lower filling station and the filling manifold and return air manifold in the upper filling station. Sampling valves 21 are provided on the filling manifolds in the lower filling station and the upper filling station, and discharge valves 22 are provided on the return air manifolds in the lower filling station and the upper filling station.

[0055] The design type of double-deck bunkering platform is also called high-low design. The height difference between the high and low positions is 3.5 meters. It meets the guiding document requirements of the China Classification Society's 2019 OCIMF "Recommendations for Manifolds and Related Equipment for Oil Tankers and Chemical Tankers" Declaration of Conformity.

[0056] The layout of methanol filling station is very important. The filling station on the filling ship is usually located in the best position on the open deck to ensure good natural ventilation and away from the living area. The filling station system includes: integrated liquid and gas phase pipelines, ESD valves, pressure sensors and pressure gauges on the pipelines, taking into account sampling, discharge, sweeping and other functions. Gas detection and leakage monitoring devices are set up around the filling station, and ESL ship-shore connection system interface, ESD emergency stop button, high-level alarm sound and light indication are provided to ensure the safety of the filling process. Dry quick male connectors are configured for quick connection of liquid inlet and steam recovery hoses. Gas phase pipes, liquid phase pipes, saddles, ESD, quick connectors, ELS, liquid collection trays, etc. are divided into two sets of upper and lower layers. The upper and lower liquid phase pipes and gas phase pipes are respectively switched with valves (butterfly valves) on the filling main pipe and the return gas main pipe to control the use of high and low position filling. The lower filling station has good operating space outside the hull and on both sides, meeting the requirements of hose lifting and connection operations; and the foam liquid fire extinguishing system on the deck can cover the high and low filling stations.

[0057] When the above technical solution is adopted, the complete filling process is as follows:

[0058] Two liquid phase pipes (filling manifolds) and two gas phase pipes (return gas manifolds) are set on each side of the upper and lower bunkering platform manifolds. The first lower bunkering manifold and the second lower bunkering manifold, the first upper bunkering manifold and the second upper bunkering manifold control the liquid phase pipeline through valves (butterfly valves). The respective liquid phase pipelines are not interconnected. In addition to being controlled separately, the gas phase pipes can be interconnected in the system and serve as backup for each other. When one set of return gas fails, the other set is started to complete the return gas, avoiding accidents caused by negative pressure in the tank suction. Refer to the guiding document requirements of the China Classification Society 2019 OCIMF "Recommendations for Manifolds and Related Equipment for Oil Tankers and Chemical Tankers" Declaration of Conformity. The center of the cargo and cargo steam pipe flanges should be at least 900mm higher than the working platform, thereby meeting and applying the height requirements for the valve installation position.

[0059] According to the height of the receiving station, choose the lower or upper filling station. For the specific selection conditions, first do a compatibility analysis of the filling operation, align the filling return air pipeline of the filling ship and the receiving ship, check the overlap range of the parallel center bodies of the two ships, and due to the influence of the ship line type, there may be a mooring state between the two ships head to head and head to tail. Mooring calculation analysis should also be considered, which is not within the scope of this patent and will not be discussed in depth. The purpose is to arrange 4 anchor balls (all thrown by the filling ship) between the overlapping parallel center bodies of the ship-to-ship. Since the draft depth of the receiving ship when it arrives at the port for filling has been determined, the compatibility plan analysis is usually considered by the filling ship. After the filling ship is loaded, it is usually heavily loaded or fully loaded. At this time, the draft is deeper and the filling ship's ability to adjust the ballast draft is limited. In addition, the depth of the receiving ship is usually much higher than that of the filling ship. Therefore, the height difference of the ship's side manifold restricts the filling efficiency and increases the risk. In an ideal situation, there is basically no height difference or the bunkering ship is slightly higher than the receiving ship, and the gravity potential energy of the liquid is used to achieve rapid filling, reducing the workload of the liquid cargo screw pump of the bunkering ship. A double-layer filling station can solve this problem better. For large height differences in the shipboard manifold, if the first-layer filling station is used, it will exceed the safe working range of a single hose length (usually 20 meters). If a second-layer filling station is used, there is an adjustment range of 3-5 meters. It should be noted that the hose cannot be extended during the filling operation, and there is a risk of leakage in the joint flange. In addition, the technical specifications require that the length of the hose is usually calculated to be no less than twice the height difference between the two shipboard manifolds. See Figure 7 shown.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A double-deck filling station for a methanol filling ship, wherein a storage room (8) is arranged on the main deck (1) of the ship, and wherein: A lower filling station is arranged on the main deck (1) of the ship, and an upper filling station is arranged on the storage room (8), wherein the upper filling station is 3-5 meters higher than the lower filling station; The lower filling station comprises a first lower filling header (3), a first lower air return header (4), a second lower filling header (5) and a second lower air return header (6); in the lower filling station, a first liquid collecting tray (2) is arranged on the main deck (1) of the ship via a first fixing bracket (7), and a filling joint and an air return joint are arranged above the first liquid collecting tray (2); The upper filling station comprises a first upper filling header (11), a first upper air return header (12), a second upper filling header (13) and a second upper air return header (14); in the upper filling station, a second liquid collecting pan (9) is arranged on a side wall of the storage chamber (8) via a second fixing bracket (10), and a filling joint and an air return joint are arranged above the second liquid collecting pan (9); The return air manifolds in the lower filling station and the upper filling station are connected to the return air main pipe through valves, and the filling manifolds in the lower filling station and the upper filling station are connected to the filling main pipe through valves, and the use of the lower filling station or the upper filling station is controlled by valve switching.

2. A double-layer filling station for methanol filling ships according to claim 1, characterized in that: First lower filling joints (3a) are provided at both ends of the first lower filling header (3), first lower return gas joints (4a) are provided at both ends of the first lower return gas header (4), second lower filling joints (5a) are provided at both ends of the second lower filling header (5), and second lower return gas joints (6a) are provided at both ends of the second lower return gas header (6).

3. The double-layer filling station for methanol filling ships according to claim 1, characterized in that: First upper filling joints (11a) are provided at both ends of the first upper filling header (11), first upper return gas joints (12a) are provided at both ends of the first upper return gas header (12), second upper filling joints (13a) are provided at both ends of the second upper filling header (13), and second upper return gas joints (14a) are provided at both ends of the second upper return gas header (14).

4. The double-layer filling station for methanol filling ships according to claim 1, characterized in that: The first lower filling manifold (3) is connected to the first filling main pipe (16) via a first lower filling valve (3b), the first lower return air manifold (4) is connected to the first return air main pipe (15) via a first lower return air valve (4b), the second lower filling manifold (5) is connected to the second filling main pipe (17) via a second lower filling valve (5b), and the second lower return air manifold (6) is connected to the second return air main pipe (18) via a second lower return air valve (6b).

5. The double-layer filling station for methanol filling ships according to claim 1, characterized in that: The first upper filling manifold (11) is connected to the first filling main pipe (16) via a first upper filling valve (11b), the first upper return air manifold (12) is connected to the first return air main pipe (15) via a first upper return air valve (12b), the second upper filling manifold (13) is connected to the second filling main pipe (17) via a second upper filling valve (13b), and the second upper return air manifold (14) is connected to the second return air main pipe (18) via a second upper return air valve (14b).

6. The double-layer filling station for methanol filling ships according to claim 1, characterized in that: The first liquid collecting tray (2) and the second liquid collecting tray (9) are connected to the discharge chamber (22) via a discharge pipe.

7. The double-layer filling station for methanol filling ships according to claim 1, characterized in that: A first lower layer filling joint (3a), a first lower layer air return joint (4a), a second lower layer filling joint (5a) and a second lower layer air return joint (6a) are arranged above the first liquid collecting tray (2).

8. The double-layer filling station for methanol filling ships according to claim 1, characterized in that: A first upper filling joint (11a), a first upper air return joint (12a), a second upper filling joint (13a) and a second upper air return joint (14a) are arranged above the second liquid collecting tray (9).

9. The double-layer filling station for methanol filling ships according to claim 1, characterized in that: A nitrogen valve (19) is provided on the filling header and the return air header in the lower filling station and the filling header and the return air header in the upper filling station.

10. The double-layer filling station for methanol filling ships according to claim 1, characterized in that: Sampling valves (21) are provided on the filling headers in the lower filling station and the upper filling station, and discharge valves (20) are provided on the return air headers in the lower filling station and the upper filling station.

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