A methanol evaporation gas treatment system for dual-fuel ships

Abstract

The application provides a methanol evaporation gas treatment system for a dual-fuel ship. The system comprises a main deck, a methanol pump room and a fuel preparation room, the methanol pump room and the fuel preparation room are both below the main deck, the main deck is provided with a vent mast, the methanol pump room is connected with a collecting branch pipe and the fuel preparation room through a collecting main pipe in sequence, the collecting branch pipe is connected with a smoke arrestor, a pressure vacuum valve and a methanol fuel storage cabin in sequence, the methanol fuel storage cabin is connected with a venting pipeline and a high-speed venting valve arranged on the vent mast; the methanol pump room comprises a jet pump, the jet pump is connected with a discharge outboard valve, fire-fighting driving water, a needle valve, a pump room check valve and the collecting main pipe, a control branch is arranged near the pump room check valve, the fuel preparation room comprises a methanol daily use cabin, the methanol daily use cabin is connected with the collecting main pipe through a daily use collecting branch pipe and is connected with a daily use venting pipeline and a daily use high-speed venting valve arranged on the vent mast. The application has high safety, stable control, methanol emission automation, energy saving and emission reduction.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ship fuel transportation, in particular to a methanol evaporation gas treatment system of a dual-fuel ship. BACKGROUND

[0002] The green methanol made of carbon dioxide can well meet the increasing carbon emission requirements, but methanol is a volatile liquid and belongs to Class A fire hazardous material, and improper storage or leakage may cause combustion and explosion at any time.

[0003] When the dual-fuel methanol ship transports methanol, the methanol in the methanol cabin is easily volatilized into methanol vapor, and once static electricity or open flame is generated, fire and explosion are likely to occur. Meanwhile, methanol vapor is toxic to the human body and can cause poisoning damage to the optic nerve and central nervous system through inhalation, ingestion and absorption.

[0004] Therefore, a methanol evaporation gas treatment system is set up, which is an important part of the methanol enclosure system. The existing methanol vapor treatment system generally sprays at high speed through the PV valve in the methanol cabin and is directly discharged into the air or seawater, lacking a stable control system and safety protection, and directly discharging into the air or seawater causes waste of resources. SUMMARY

[0005] The present application aims at the deficiencies of the prior art and provides a methanol evaporation gas treatment system of a dual-fuel ship, which is automatic, safe and controllable.

[0006] In order to achieve the above object, the technical scheme adopted by the present application is: a methanol evaporation gas treatment system for a dual-fuel ship, comprising a main deck, a methanol pump room and a fuel preparation room, the methanol pump room and the fuel preparation room are both below the main deck, and a vent mast is further arranged above the main deck; the methanol pump room is connected with a collecting branch pipe and the fuel preparation room in sequence through a collecting main pipe; the collecting branch pipe is connected with a smoke arrestor, a pressure vacuum valve and a methanol fuel storage cabin in sequence; the methanol fuel storage cabin is connected with a vent pipe in sequence upwards, and the vent pipe is connected with a high-speed vent valve arranged in the vent mast at the end; the methanol pump room comprises a jet pump, the jet end of the jet pump is connected with a discharge outboard valve, the water inlet end of the jet pump is connected with a fire-fighting driving water, and the air inlet end of the jet pump is connected with a needle valve, a pump room check valve and the collecting main pipe in sequence; a control branch is arranged near the pump room check valve, and the control branch is connected with the collecting main pipe, a three-way plug valve, a high-pressure switch and the needle valve in sequence; the fuel preparation room comprises a methanol daily cabin, the methanol daily cabin is connected with the collecting main pipe through a daily collecting branch pipe, the daily collecting branch pipe is connected with a daily pressure vacuum valve and a daily smoke arrestor in sequence, the methanol daily cabin is connected with a daily vent pipe in sequence upwards, and the daily vent pipe is connected with a daily high-speed vent valve arranged in the vent mast. The independent collecting branch pipe and the smoke arrestor are arranged to manage and prevent fire of each methanol fuel storage cabin, so that the fire accident of a single methanol fuel storage cabin does not affect adjacent methanol fuel storage cabins; the vent pipe is arranged for each methanol fuel storage cabin, so that the methanol evaporation gas in the cabin is discharged in an emergency when the methanol evaporation gas is close to a limit pressure value; the methanol pump room with automatic sea discharge is arranged in the collecting main pipe to maintain normal discharge of the methanol fuel storage cabin and the methanol daily cabin.

[0007] Preferably, the collecting main pipe is connected with a filling pressure vacuum valve and a filling station.

[0008] Preferably, the methanol fuel storage cabin is connected with a nitrogen system through a check valve and a pressure regulating valve in sequence, and the methanol daily cabin is connected with a daily nitrogen system through a daily check valve and a daily pressure regulating valve in sequence. The nitrogen system is used to discharge air in the cabin, so that the methanol and the air do not form an explosive mixture, and the nitrogen system is used to introduce nitrogen to form a sealing layer, so that the methanol is prevented from volatilizing, and the nitrogen can also protect the cabin wall to prevent excessive corrosion of the cabin wall by the methanol evaporation gas.

[0009] Preferably, the set values of the pressure regulating valve and the daily pressure regulating valve are both 0.2 bar. When the methanol fuel storage cabin and the methanol daily cabin are filled, the nitrogen is injected into the cabin through the pressure regulating valve of the nitrogen system, and the nitrogen injection is stopped when the pressure value reaches 0.2 bar.

[0010] Preferably, the cabin strength of the methanol fuel storage cabin and the daily methanol cabin is set to 0.5 bar.

[0011] The high pressure switch is preferably set at 0.3 bar. When the pressure of the methanol evaporation gas in the collecting manifold measured by the high pressure switch between the methanol pumps is higher than 0.3 bar, the high pressure switch will automatically open, the methanol evaporation gas will enter the jet pump through the needle valve, and the high pressure methanol evaporation gas will be discharged into the sea through the jet pump. When the pressure is lower than 0.3 bar, the high pressure switch will automatically close.

[0012] The high speed air vent valve is preferably set at 0.4 bar.

[0013] Compared with the prior art, the present application has the following advantages: the methanol evaporation gas in the methanol cabin is mixed to form methanol-nitrogen mixed gas by the nitrogen system, the concentration of the mixed gas of air and methanol evaporation gas in the system is reduced, and the occurrence of fire and explosion is reduced; the collecting manifold is connected to the methanol pump room, the jet pump and the high pressure switch in the methanol pump room automatically discharge the methanol evaporation gas in the collecting manifold, the overpressure methanol evaporation gas is discharged in emergency through the air vent pipeline and the high speed air vent valve, and the normal operation of the system is automatically maintained; the methanol evaporation gas collecting manifold and the gas phase pipeline are shared, the pipeline utilization efficiency is increased, the influence of the fire and explosion of a single methanol cabin on other methanol cabins is minimized by setting a smoke damper in a separate collecting branch, and the safety of the system is increased; the maintenance is convenient, the use is flexible, and the system is suitable for various types of methanol dual-fuel ships. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a structural schematic diagram of the present application.

[0015] 1 - main deck, 2 - methanol pump room, 21 - jet pump, 22 - discharge overboard valve, 23 - fire drive water, 24 - pump room check valve, 25 - needle valve, 26 - three-way cock valve, 27 - high pressure switch, 28 - control branch, 3 - fuel preparation room, 31 - methanol daily tank, 32 - daily collection branch pipe, 33 - daily pressure vacuum valve, 34 - daily smoke arrestor, 35 - daily breather line, 36 - daily high-speed breather valve, 4 - breather mast, 5 - collection main pipe, 51 - first collection branch pipe, 511 - first smoke arrestor, 512 - first pressure vacuum valve, 513 - first methanol fuel storage tank, 514 - first breather line, 515 - first high-speed breather valve, 52 - second collection branch pipe, 521 - second smoke arrestor, 522 - second pressure vacuum valve, 523 - second methanol fuel storage tank, 524 - second breather line, 525 - second high-speed breather valve, 53 - third collection branch pipe, 531 - third smoke arrestor, 532 - third pressure vacuum valve, 533 - third methanol fuel storage tank, 534 - third breather line, 535 - third high-speed breather valve, 611 - first nitrogen system, 612 - first check valve, 613 - first pressure regulating valve, 621 - second nitrogen system, 622 - second check valve, 623 - second pressure regulating valve, 631 - third nitrogen system, 632 - third check valve, 633 - third pressure regulating valve, 641 - daily nitrogen system, 642 - daily check valve, 643 - daily pressure regulating valve, 711 - main filling pressure vacuum valve, 712 - main filling station, 721 - secondary filling pressure vacuum valve, 722 - secondary filling station. DETAILED DESCRIPTION

[0016] The present application will be further clarified by the following examples, which should be considered as exemplary and non-limiting. It should be understood that various equivalents and modifications can be resorted to without departing from the spirit of the application. Likewise, other changes can be made in the procedure described herein in conjunction with the specific embodiments to adapt to specific situations without departing from the scope of the application.

[0017] As Figure 1The illustrated dual-fuel ship methanol vapor treatment system includes a main deck 1, a methanol pump room 2 and a fuel preparation room 3, the methanol pump room 2 and the fuel preparation room 3 are both below the main deck 1, and a vent mast 4 is further arranged above the main deck 1, the methanol pump room 2 is connected with the first collecting branch pipe 51, the second collecting branch pipe 52, the third collecting branch pipe 53 and the fuel preparation room 3 in sequence through the collecting main pipe 5, the first collecting branch pipe 51 is connected with the first smoke arrestor 511, the first pressure vacuum valve 512 and the first methanol fuel storage cabin 513 in sequence, the second collecting branch pipe 52 is connected with the second smoke arrestor 521, the second pressure vacuum valve 522 and the second methanol fuel storage cabin 523 in sequence, the third collecting branch pipe 53 is connected with the third smoke arrestor 531, the third pressure vacuum valve 532 and the third methanol fuel storage cabin 533 in sequence, the first methanol fuel storage cabin 513 is connected with the first vent pipe 514 upwards, the end of the first vent pipe 514 is connected with the first high-speed vent valve 515 arranged in the vent mast 4, the second methanol fuel storage cabin 523 is connected with the second vent pipe 524 upwards, the end of the second vent pipe 524 is connected with the second high-speed vent valve 525 arranged in the vent mast 4, and the third methanol fuel storage cabin 533 is connected with the third vent pipe 534 upwards, the end of the third vent pipe 534 is connected with the third high-speed vent valve 535 arranged in the vent mast 4; the methanol pump room 2 includes a jet pump 21, the jet end flange of the jet pump 21 is connected with the outboard valve 22, the water inlet end flange of the jet pump 21 is connected with the fire-fighting driving water 23, the gas inlet end of the jet pump 21 is connected with the needle valve 25, the pump room check valve 24 and the collecting main pipe 5 in sequence, the control branch 28 is arranged close to the pump room check valve 24, the control branch 28 is connected with the collecting main pipe 5, the three-way stopcock valve 26, the high-level pressure switch 27 and the needle valve 25 in sequence; the fuel preparation room 3 includes a methanol daily-use cabin 31, the methanol daily-use cabin 31 is connected with the collecting main pipe 5 through the daily-use collecting branch pipe 32, the daily-use pressure vacuum valve 33 and the daily-use smoke arrestor 34 are connected in sequence in the daily-use collecting branch pipe 32, the methanol daily-use cabin 31 is connected with the daily-use vent pipe 35 upwards, and the daily-use high-speed vent valve 36 arranged in the vent mast 4 is connected with the daily-use vent pipe 35.

[0018] Further, the collecting main pipe 5 is connected with the main filling pressure vacuum valve 711 and the main filling station 712, and the collecting main pipe 5 is connected with the secondary filling pressure vacuum valve 721 and the secondary filling station 722.

[0019] Further, the first methanol fuel storage tank 513 is connected to the first nitrogen system 611 through the first check valve 612 and the first pressure regulating valve 613 in sequence, the second methanol fuel storage tank 523 is connected to the second nitrogen system 621 through the second check valve 622 and the second pressure regulating valve 623 in sequence, the third methanol fuel storage tank 533 is connected to the third nitrogen system 631 through the third check valve 632 and the third pressure regulating valve 633 in sequence, and the methanol daily use tank 31 is connected to the daily use nitrogen system 641 through the daily use check valve 642 and the daily use pressure regulating valve 643 in sequence.

[0020] Further, the set value of the first pressure regulating valve 613, the second pressure regulating valve 623, the third pressure regulating valve 633 and the daily use pressure regulating valve 643 is 0.2 bar.

[0021] Further, the tank strength of the first methanol fuel storage tank 513, the second methanol fuel storage tank 523 and the third methanol fuel storage tank 533 is set to 0.5 bar.

[0022] Further, the set value of the high position pressure switch 27 is 0.3 bar.

[0023] Further, the set value of the first high speed breather valve 515, the second high speed breather valve 525, the third high speed breather valve 535 and the daily use high speed breather valve 36 is 0.4 bar.

[0024] Under normal circumstances, methanol liquid is added to the methanol fuel storage tank and the methanol daily use tank through the filling station, at this time the collection main pipe serves as the gas phase pipe of methanol evaporation gas, which is used for evaporation gas recovery during methanol filling, after the methanol liquid is filled, the nitrogen system in the methanol fuel storage tank and the methanol daily use tank mixes the methanol evaporation gas in the tank chamber; once the pressure value of the methanol evaporation gas in the tank chamber of the methanol fuel storage tank and the methanol daily use tank exceeds 0.3 bar, the methanol evaporation gas is discharged through the jet pump; when the pressure value of the methanol evaporation gas in the tank chamber of the methanol fuel storage tank and the methanol daily use tank reaches 0.4 bar, the methanol evaporation gas with the pressure value exceeding 0.4 bar is discharged into the air through the high speed breather valve arranged on the breather mast through the breather pipeline.

[0025] The above description shows and describes the preferred embodiments of the present application, as previously described, it should be understood that the present application is not limited to the forms disclosed herein, should not be considered as excluding other embodiments, and can be used in various other combinations, modifications and environments, and can be modified within the scope of the inventive concept described herein, through the above teaching or related technical or knowledge. The modifications and changes made by the person skilled in the art without departing from the spirit and scope of the present application shall be within the protection scope of the appended claims of the present application.

Claims

1. A methanol vapor treatment system for a dual-fuel ship, comprising a main deck, a methanol pump room, and a fuel preparation room, wherein the methanol pump room and the fuel preparation room are both located below the main deck, and a ventilated mast is also provided above the main deck, characterized in that: The methanol pump room is connected in sequence to a collection branch pipe and a fuel preparation room via a main collection pipe. The collection branch pipe is connected in sequence to a smoke arrester, a pressure vacuum valve, and a methanol fuel storage tank. The methanol fuel storage tank is connected upwards to a vent pipe, the end of which is connected to a high-speed vent valve installed on the vent mast. The methanol pump room includes a jet pump. The jet pump's jet end is connected to an overboard valve, and the jet pump's water inlet is connected to a fire-fighting water supply. The jet pump's air inlet is connected in sequence to a needle valve, a pump room check valve, and the main collection pipe. A control branch is located near the pump room check valve, and the control branch is connected in sequence to the main collection pipe, a three-way stopcock valve, a high-level pressure switch, and a needle valve. The fuel preparation room includes a methanol day tank. The methanol day tank is connected to the main collection pipe via a day collection branch pipe. The day collection branch pipe is connected in sequence to a day pressure vacuum valve and a day smoke arrester. The methanol day tank is connected upwards to a day vent pipe, which is connected to a day high-speed vent valve installed on the vent mast.

2. The methanol vapor treatment system for a dual-fuel ship according to claim 1, characterized in that: The main collection pipe is connected to a filling pressure vacuum valve and a filling station.

3. The methanol vapor treatment system for a dual-fuel ship according to claim 1, characterized in that: The methanol fuel storage tank is connected to the nitrogen system in sequence via a check valve and a pressure regulating valve, and the methanol daily use tank is connected to the daily use nitrogen system in sequence via a daily use check valve and a daily use pressure regulating valve.

4. The methanol vapor treatment system for a dual-fuel ship according to claim 3, characterized in that: The set value of both the pressure regulating valve and the daily pressure regulating valve is 0.2 bar.

5. The methanol vapor treatment system for a dual-fuel ship according to claim 1, characterized in that: The cabin strength of the methanol fuel storage tank and the methanol day use tank is set at 0.5 bar.

6. The methanol vapor treatment system for a dual-fuel ship according to claim 1, characterized in that: The high-pressure switch is set at 0.3 bar.

7. The methanol vapor treatment system for a dual-fuel ship according to claim 1, characterized in that: The set value for the high-speed vent valve and the daily-use high-speed vent valve is 0.4 bar.

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