Methanol dual-fuel refit arrangement scheme for large container ship

Abstract

According to the methanol dual-fuel modification arrangement scheme, a cargo hold of the large container ship is modified into a methanol storage hold and small cargo holds on the two sides of the methanol storage hold, and fuel preparation rooms are arranged between the two small cargo holds, the top of the methanol storage hold and a small hold opening cover above the methanol storage hold; the fuel oil tanks are arranged below the small cargo holds on the two sides; a methanol filling station is arranged at the position of a container on the outermost side of the upper layer of the main deck. According to the invention, on the premise of meeting the demand of a ship owner, the occupation of methanol dual-fuel modification on the container position is reduced as much as possible, and the operation economy of the modified large container ship is improved.

Description

Technical Field

[0001] The invention relates to a methanol dual-fuel modification layout scheme for a large container ship, and in particular to the field of methanol dual-fuel modification design for a large container ship. Background Art

[0002] Due to the need for decarbonization in the shipping industry, large international container shipping companies have been looking for alternative fuel modification solutions for existing ship types. Green methanol fuel is one of the increasingly popular alternative fuels. The contradiction that needs to be resolved in the methanol dual-fuel modification of container ships is to minimize the loss of container space while meeting the capacity requirements of the fuel storage tank. The current mainstream modification plan is to convert one of the 40-foot tanks (hereinafter referred to as a bay) into a methanol storage tank, arrange a fuel preparation room and nitrogen and other equipment rooms (hereinafter referred to as the fuel preparation room) above the storage tank, and arrange the filling station above the main passage on the upper deck. The above conventional layout plan will result in a large loss of container space, affecting the operating economy of the shipping company. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a methanol dual-fuel modification layout scheme for a large container ship, which can reduce the loss of tank space as little as possible under the premise of meeting the capacity requirements of the fuel storage tank.

[0004] In order to solve the above problems, the present invention provides a methanol dual-fuel conversion layout plan for a large container ship: the cargo hold of the large container ship is converted into a methanol storage tank and small cargo holds on both sides thereof, the space between the two small cargo holds, the top of the methanol storage tank and the small hatch cover above the methanol storage tank are used as fuel preparation rooms, and the fuel tanks are arranged under the small cargo holds on both sides; a methanol filling station is arranged at a container position on the outermost side of the first layer above the main deck.

[0005] Preferably, the methanol storage tank, small cargo hold and fuel tank are arranged axially symmetrically.

[0006] Preferably, the methanol filling station is arranged within the length of a container and the width does not affect the opening of the small hatch cover.

[0007] Preferably, the small cargo hold is used to place container one; the small hatch cover is used to place container two; and container three is placed above container two.

[0008] Preferably, an isolation space is provided between the outer small cargo hold, the fuel tank and the methanol storage tank.

[0009] Preferably, the methanol filling station is arranged in frame box one.

[0010] More preferably, the methanol filling station is arranged in a frame box.

[0011] More preferably, the bottom of the frame box 1 is an opening for easy insertion into the methanol filling station, and no connecting structure is provided in the opening.

[0012] Furthermore, the frame box 1 and the frame box 2 are arranged along the length direction of the hull, and the specifications of both are the space for one container.

[0013] Preferably, a small skid for installing the methanol supply unit is provided on the fuel preparation room, and the bottom of the small skid is sunk below the main structural panel of the fuel preparation room.

[0014] The modification and layout scheme of the present invention is mainly aimed at the methanol dual-fuel modification of large container ships; the modification and layout scheme considers converting part of the cargo hold of a bay into a methanol storage tank and part into a small cargo hold, the methanol storage tank is arranged in the middle of the cross section, and the small cargo holds are arranged on both sides of the methanol storage tank; the methanol modification scheme arranges the fuel preparation room below the hatch coaming top plate; the modification and layout scheme only occupies the outermost row of tank spaces close to the side to arrange the methanol filling station; the modification and layout scheme adopts a movable frame box sleeve outside the filling station to solve the contradiction between the removal of the hatch cover of the small cargo hold and the support of the container above; the modification and layout scheme adopts a distributed skid-mounted form, and the large skid block is changed into a small skid block and sunk between the cross beam and the longitudinal girder on the top of the methanol storage tank to solve the installation height problem of the magnetic pump.

[0015] The above-mentioned use of a movable frame box to solve the contradiction between the removal of the hatch cover of the small cargo hold and the support of the container above means that in order to open the hatch covers of the small cargo holds on both sides of the methanol storage tank, it is necessary to ensure that there is no obstruction above the hatch covers, but in order to support the outermost pile of containers on the deck, a box column must be set on the small hatch cover. The present invention uses two 2-foot frame boxes, which are placed at the outermost and lowest layer of containers. A methanol filling station is arranged in one of the frame boxes, and an inclined ladder is arranged in the other 20-foot frame box to facilitate personnel to enter the filling station. At the same time, it can support the container above. When unloading, the frame box can be lifted out, and then the hatch cover of the small cargo hold is opened to lift out the container in the small cargo hold; after loading the goods in the small cargo hold, the frame box is lifted in to support the container above it and ensure that the filling station can be entered through the inclined ladder. In this way, it can ensure that the small cargo hold is opened smoothly and loading and unloading is convenient, and it can also ensure that the outermost row of containers on the deck is supported by box columns at the lowest layer.

[0016] The above-mentioned distributed skid-mounted method is adopted to sink the skid block between the upturned strong crossbeam and longitudinal girder on the top of the methanol storage tank to solve the installation height problem of the magnetic pump. In order to solve the impact of the fuel preparation room height on the methanol supply system in the modification plan, it is decided to adopt the form of dispersed skid-mounted method, sinking the small skid block between the main structural components, the upturned strong crossbeam and the longitudinal girder, which can save about 600mm in installation height, and the bottom of the methanol daily tank can be lowered by 600mm. For shipowners with large demand for daily tank capacity, this method can effectively avoid the daily tank occupying too much fuel preparation room space, which is very beneficial for reducing the weight of the structure and the layout of the fuel preparation room.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: in the process of methanol dual-fuel conversion, the loss of container space is minimized as much as possible, reducing the economic losses of ship owners; the use of frame boxes effectively solves the technical problems of the filling station channel and the opening of the small cargo hold hatch cover; through the split skid-mounted method combined with the method of sinking skid block arrangement, the problem of the floor height and layout of the fuel preparation room in the conversion plan is solved, ensuring that the problem of the installation height requirement of the methanol supply unit and the methanol daily tank is solved without increasing the height of the fuel preparation room, and the loss of container space is minimized. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A cross section of the methanol dual-fuel modification arrangement for a large container ship provided by the present invention;

[0019] Figure 2 It is a methanol filling station embedded in the frame box;

[0020] Figure 3 It is the structural diagram of the frame box;

[0021] Figure 4 This is a schematic diagram of the installation height requirements for the methanol supply unit (LFSS) and the methanol daily tank;

[0022] Figure 5 This is the layout diagram of the existing skid;

[0023] Figure 6 for Figure 5 Sectional view of the AA plane;

[0024] Figure 7 This is a layout diagram of the skid block of the fuel preparation room in the present invention;

[0025] Figure 8 for Figure 7 Sectional view of the BB plane. DETAILED DESCRIPTION

[0026] In order to make the present invention more clearly understood, preferred embodiments are described in detail below with reference to the accompanying drawings.

[0027] Example

[0028] The present invention provides a methanol dual-fuel modification layout scheme for large container ships. Figure 1-8 An embodiment of the present invention is shown in FIG. Figure 1 The figure shows the cross section of the methanol dual-fuel conversion area of ​​a large container ship, in which the middle part of the cargo hold area is converted into a left-right symmetrical methanol storage tank 1, the original fuel tank 2 is retained on the left and right sides of the cargo hold, and the top of the fuel tank 2 is converted into two left-right symmetrical small cargo tanks 3; the fuel tank 2, the small cargo tank 3 and the methanol storage tank 1 are separated by an isolation empty tank 4; a fuel preparation room 5 is arranged above the methanol storage tank 1; a small hatch cover 6 is arranged above the small cargo tank 3; a methanol filling station 7 is arranged on the left and right sides above the main deck; a container 1 31 is arranged in the small cargo hold 3; a container 2 61 is arranged above the small hatch cover 6; a container 3 71 is arranged above the methanol filling station 7; in order to solve the problem of supporting the container 3 71 above the methanol filling station 7 and opening the small hatch cover 6, a 20-foot frame box 1 8 is installed outside the methanol filling station 7, and in order to solve the problem of entering the methanol filling station 7 from the inclined ladder, a frame box 2 9 is also arranged in the longitudinal position.

[0029] Wherein, the frame box 1 8 and the frame box 2 9 are movable. Figure 3 As shown, it can be lifted out like a container; it ensures that the small hatch cover 6 is not blocked from opening, and the container 3 71 can be effectively supported, playing the role of a movable box column. The frame box 1 8 is a specially designed frame box that can be covered outside the fixed methanol filling station 7. The frame box 2 9 is also a specially designed frame box that can ensure that personnel can enter the filling station through an inclined ladder.

[0030] The installation height requirements of the methanol supply unit (LFSS) and the methanol daily tank refer to Figure 4 The conventional skid 10 is relatively large in size and requires a large space in the fuel preparation room (see Figure 5 , 6 ), for the converted container ship, in order to minimize the loss of container space, the height of the fuel preparation room is limited. However, there are installation height requirements for the skid 10 and the pump suction port of the methanol daily tank (see Figure 4 ), which results in the methanol daily tank occupying a large space in the fuel preparation room. Considering that the top strong crossbeam and longitudinal girder 11 of the methanol storage tank 1 are turned up to form a 3044mm×2520mm pit, the present invention splits the skid 10 into small skids 12 (see Figure 7 , 8 ), the split small skid 12 is arranged in the pit, which can reduce the installation height of the skid by about 600 mm, thus solving the floor height problem. At the same time, the methanol storage tank 1 does not need to occupy too much area, which greatly improves the layout of the fuel preparation room 5.

[0031] In summary, the methanol dual-fuel modification and layout scheme for large container ships provided by the present invention is an innovative design and comprehensive layout scheme for methanol dual-fuel modification. The scheme comprehensively considers the characteristics of container ships and the needs of shipowners, and adopts the form of cooperation between methanol storage tanks and cargo holds to minimize the loss of container space. The innovatively designed small filling station, in combination with the form of movable frame boxes, solves the problem of opening the small hatch cover and the problem of supporting the containers above the filling station. By adopting distributed skids and sunken installation, the height requirement of the methanol LFSS fuel supply unit to prevent damage to the magnetic pump is solved, and the layout of the fuel preparation room is optimized. It has been verified by actual ships that it is a very practical and popular method.

Claims

1. A methanol dual-fuel modification layout for large container ships, characterized in that: The cargo hold of a large container ship is converted into a methanol storage tank (1) and small cargo holds (3) on both sides thereof; the space between the two small cargo holds (3), the top of the methanol storage tank (1) and the small hatch cover (6) above the methanol storage tank (1) are used as a fuel preparation room (5); the fuel oil tank (2) is arranged below the small cargo holds (3) on both sides; and a methanol filling station (7) is arranged at a container position on the outermost side of the first layer above the main deck.

2. The methanol dual-fuel modification layout scheme for large container ships according to claim 1 is characterized in that: The methanol storage tank (1), the small cargo tank (3), and the fuel tank (2) are arranged in an axisymmetric manner.

3. The methanol dual-fuel modification arrangement scheme for large container ships according to claim 1 is characterized in that: The methanol filling station (7) is arranged within the length of a container and the width does not affect the opening of the small hatch cover (6).

4. The methanol dual-fuel modification arrangement scheme for large container ships according to claim 1 is characterized in that: The small cargo hold (3) is used to place container one (31); the small hatch cover (6) is used to place container two (61); and container three (71) is placed above container two (61).

5. The methanol dual-fuel modification arrangement scheme for large container ships according to claim 1 is characterized in that: An isolation empty tank (4) is provided between the outer small cargo tank (3), the fuel tank (2) and the methanol storage tank (1).

6. The methanol dual-fuel modification arrangement scheme for large container ships according to claim 1 is characterized in that: The methanol filling station (7) is arranged in frame box one (8).

7. The methanol dual-fuel modification arrangement scheme for large container ships according to claim 6 is characterized in that: The methanol filling station (7) is arranged in frame box one (8).

8. The methanol dual-fuel modification arrangement scheme for large container ships according to claim 6 is characterized in that: The lower part of the frame box 1 (8) is an opening for inserting the methanol filling station (7), and no connection structure is provided in the opening.

9. The methanol dual-fuel modification arrangement scheme for large container ships according to claim 8, characterized in that: The frame box 1 (8) and frame box 2 (9) are arranged along the length direction of the ship body, and both have the specification of a container space.

10. The methanol dual-fuel modification arrangement scheme for large container ships according to claim 1, characterized in that: The fuel preparation room (5) is provided with a small skid (12) for installing a methanol supply unit, and the bottom of the small skid (12) is sunk below the main structural panel of the fuel preparation room (5).

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