Ventilation system for fuel oil and methanol dual-purpose cabin of dual-fuel bulk carrier

Abstract

The invention discloses a ventilation system for a fuel oil and methanol dual-purpose cabin of a dual-fuel bulk carrier. The ventilation system of the fuel oil and methanol dual-purpose cabin of the dual-fuel bulk carrier comprises a dual-purpose cabin installed in a void cabin, at least one fuel oil ventilation pipe is arranged at the top of the dual-purpose cabin, an air pipe head is arranged at the top, penetrating out of the void cabin and a deck, of the fuel oil ventilation pipe, a first on-off piece is arranged on the fuel oil ventilation pipe and used for controlling on-off of the fuel oil ventilation pipe, and a second on-off piece is arranged on the deck and used for controlling on-off of the fuel oil ventilation pipe. The fuel vent pipe is communicated with an intercommunication vent pipe between the first on-off piece and the dual-purpose cabin, the intercommunication vent pipe is communicated with a methanol vent branch pipe, the methanol vent branch pipe is communicated with a methanol vent header pipe, the methanol vent header pipe is laid to a vent mast, and a pressure vacuum valve is arranged on the methanol vent branch pipe; and a second on-off piece is arranged on the intercommunication vent pipe between the methanol vent branch pipe and the fuel vent pipe, and is used for controlling the on-off of the intercommunication vent pipe. The problem that the prior art cannot be applied to the dual-purpose cabin is solved.

Description

Technical Field

[0001] The invention relates to the technical field of shipbuilding, and in particular to a ventilation system for a fuel oil and methanol combined tank of a dual-fuel bulk carrier. Background Art

[0002] As new energy ships develop better and better, many ship owners have begun to focus on green fuel methanol ships, but since the methanol fuel supply chain is not yet complete, some ships still need to retain fuel power, so the idea of ​​methanol tanks also serving as fuel tanks has emerged. However, considering the characteristics of methanol and fuel, the ventilation requirements of dual-purpose tanks when storing methanol and fuel are different, so it is necessary to design a ventilation system suitable for the dual-purpose tank. Summary of the invention

[0003] The purpose of the present invention is to provide a dual-fuel bulk carrier fuel oil and methanol combined tank ventilation system that can be used for dual-fuel bulk carriers in view of the deficiencies in the prior art.

[0004] To achieve the above purpose, the technical solution adopted by the ventilation system of the fuel oil and methanol dual-purpose tank of the dual-fuel bulk carrier of the present invention is:

[0005] A fuel oil and methanol combined tank ventilation system for a dual-fuel bulk carrier comprises a combined tank installed inside an empty tank, at least one fuel oil ventilation pipe is arranged on the top of the combined tank, an air pipe head is arranged on the top of the fuel ventilation pipe passing through the empty tank and the deck, a first on-off piece is arranged on the fuel ventilation pipe for controlling the on-off of the fuel ventilation pipe, the fuel ventilation pipe is located between the first on-off piece and the combined tank and is connected with an intercommunication ventilation pipe, the intercommunication ventilation pipe is connected with a methanol ventilation branch pipe, the methanol ventilation branch pipe is connected with a methanol ventilation main pipe, the methanol ventilation main pipe is laid to the ventilation mast, a pressure vacuum valve is arranged on the methanol ventilation branch pipe, and the intercommunication ventilation pipe is located between the methanol ventilation branch pipe and the fuel ventilation pipe and is provided with a second on-off piece for controlling the on-off of the intercommunication ventilation pipe.

[0006] Preferably, the first and second switching members may be in the form of double blind flanges, or in the form of interchangeable short tubes and blind flanges.

[0007] Preferably, the fuel air permeable pipe is located below the air pipe head and is provided with an oil containment tank and an oil return device in sequence.

[0008] Preferably, the minimum distance from the air pipe head to the deck is 1400 mm.

[0009] Preferably, the ventilation mast is placed at the stern.

[0010] Preferably, a flame arrester is provided on the top of the methanol ventilation main pipe laid to the ventilation mast.

[0011] Compared with the prior art, the present invention has the following advantages:

[0012] When the fuel stored in the combined-use tank is methanol, keep the inter-vent pipe unobstructed, cut off the fuel oil vent pipe by the first on-off piece, and when the air pressure in the combined-use tank is too high, the pressure vacuum valve opens automatically, and the combined-use tank releases pressure through the inter-vent pipe, methanol vent branch pipe, methanol vent main pipe and vent mast in sequence; when the fuel stored in the combined-use tank is fuel oil, keep the fuel oil vent pipe unobstructed, cut off the inter-vent pipe by the second on-off piece, and the combined-use tank releases pressure to the outside directly through the fuel oil vent pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The present invention is a schematic structural diagram of a ventilation system for a fuel oil and methanol combined tank of a dual-fuel bulk carrier.

[0014] Figure 2 This is a schematic diagram of the working of the ventilation system when the fuel stored in the combined-use tank is methanol.

[0015] Figure 3 This is a schematic diagram of the working of the ventilation system when the fuel stored in the combined-use tank is fuel oil.

[0016] Among them, 1 is a combined-purpose cabin, 2 is a fuel oil vent pipe, 3 is an air pipe head, 4 is an oil tank, 5 is an oil return device, 6 is a first on-off piece, 7 is an interconnecting vent pipe, 8 is a methanol vent branch pipe, 9 is a pressure vacuum valve, 10 is a second on-off piece, 11 is a methanol vent main pipe, 12 is a vent mast, and 13 is a flame arrester. DETAILED DESCRIPTION

[0017] The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, various equivalent forms of modifications to the present invention by those skilled in the art all fall within the scope defined by the claims attached to this application.

[0018] like Figure 1-3As shown, a ventilation system for a fuel oil and methanol combined tank of a dual-fuel bulk carrier comprises a combined tank 1 installed inside an empty tank, a fuel ventilation pipe 2 is installed on each of the left and right sides of the top of the combined tank, the fuel ventilation pipe passes through the empty tank and the top of the deck and an air pipe head 3 is installed, the minimum distance from the air pipe head to the deck is 1400mm, the fuel ventilation pipe is located below the air pipe head, and an oil tank 4 and an oil return device 5 are installed in sequence to facilitate the secondary recovery of volatilized oil and gas, a first on-off piece 6 is installed on the fuel ventilation pipe to control the on-off of the fuel ventilation pipe, in order to ensure safety, valve components are rarely used or even not used on the ventilation pipe (to prevent personnel from operating incorrectly), so the first on-off piece adopts the form of a double blind plate flange, the fuel ventilation pipe is opened by using one side of the double blind plate flange through hole, and the fuel ventilation pipe is closed by using one side of the double blind plate flange blind plate, and the fuel ventilation pipe on the right side is located at the double blind plate method An inter-vent pipe 7 is connected between the flange and the combined-use tank. After the combined-use tank and the methanol daily tank are connected through the inter-vent pipe, there is no pressure difference between the two, which is convenient for the transfer of methanol fuel. The inter-vent pipe is connected to the methanol vent branch pipe 8. A pressure vacuum valve 9 is installed on the methanol vent branch pipe. The inter-vent pipe is located between the methanol vent branch pipe and the fuel vent pipe. A second on-off piece 10 is installed to control the on-off of the inter-vent pipe. Also for safety considerations, the second on-off piece is in the form of a short pipe and a blind flange interchangeable. A short pipe is connected to the disconnection of the inter-vent pipe to open the inter-vent pipe, and a blind flange is installed at the disconnection of the inter-vent pipe to close the inter-vent pipe. The methanol vent branch pipe is connected to the methanol vent main pipe 11, and the methanol vent main pipe is laid to the vent mast 12. The vent mast is placed at the stern, away from the living area, and has high safety. A flame arrester 13 is installed on the top of the methanol vent main pipe laid to the vent mast.

[0019] The specific working process and principle of a ventilation system for a fuel oil and methanol combined tank of a dual-fuel bulk carrier are as follows: before injecting methanol into the combined tank, a short pipe is connected at the disconnection of an intercommunication ventilation pipe, and the fuel oil ventilation pipe is cut off by using one side of a blind plate of a double blind plate flange; after injecting methanol, under the action of the intercommunication ventilation pipe, there is no pressure difference between the combined tank and the methanol daily tank, which is convenient for methanol transfer; when the air pressure in the combined tank is too high, the pressure vacuum valve is automatically opened, and the combined tank releases pressure through the intercommunication ventilation pipe, the methanol ventilation branch pipe, the methanol ventilation main pipe and the ventilation mast in sequence; as the methanol in the combined tank is consumed, the air pressure in the combined tank becomes too low, and inert gas is introduced into the combined tank through the intercommunication ventilation pipe for pressurization; before injecting fuel oil into the combined tank, the combined tank is cleaned, the short pipe is removed, and a blind flange is installed at the disconnection of the intercommunication ventilation pipe, thereby cutting off the intercommunication ventilation pipe; at the same time, the fuel oil ventilation pipe is opened by using one side of the through hole of the double blind plate flange, and the combined tank directly releases pressure to the outside through the fuel oil ventilation pipe.

Claims

1. A dual-fuel bulk carrier fuel oil and methanol combined tank ventilation system, comprising a combined tank installed inside an empty tank, characterized in that: At least one fuel ventilation pipe is arranged on the top of the dual-purpose cabin, and an air pipe head is arranged on the top of the fuel ventilation pipe passing through the empty cabin and the deck, and a first on-off piece is arranged on the fuel ventilation pipe for controlling the on-off of the fuel ventilation pipe, and the fuel ventilation pipe is located between the first on-off piece and the dual-purpose cabin and is connected with an inter-ventilation pipe, and the inter-ventilation pipe is connected with a methanol ventilation branch pipe, and the methanol ventilation branch pipe is connected with a methanol ventilation main pipe, and the methanol ventilation main pipe is laid to the ventilation mast, and a pressure vacuum valve is arranged on the methanol ventilation branch pipe, and a second on-off piece is arranged on the inter-ventilation pipe between the methanol ventilation branch pipe and the fuel ventilation pipe for controlling the on-off of the inter-ventilation pipe.

2. The dual-fuel bulk carrier fuel oil and methanol combined tank ventilation system according to claim 1 is characterized by: The first and second switch pieces may be in the form of double blind flanges, or in the form of interchangeable short pipes and blind flanges.

3. The dual-fuel bulk carrier fuel oil and methanol combined tank ventilation system according to claim 1 is characterized by: The fuel air permeable pipe is located below the air pipe head and is provided with an oil containment tank and an oil return device in sequence.

4. The dual-fuel bulk carrier fuel oil and methanol combined tank ventilation system according to claim 3 is characterized by: The minimum distance from the air pipe head to the deck is 1400 mm.

5. The dual-fuel bulk carrier fuel oil and methanol combined tank ventilation system according to claim 1 is characterized by: The air-permeable mast is placed at the stern.

6. The dual-fuel bulk carrier fuel oil and methanol combined tank ventilation system according to claim 5 is characterized by: A flame arrester is provided on the top of the methanol ventilation main pipe laid to the ventilation mast.

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