Engine room alcohol-resistant high-expansion foam system of methanol fuel ultra-large oil tanker

Abstract

An anti-alcohol type high-expansion foam system for an engine room of a methanol fuel ultra-large oil tanker is characterized in that the system comprises a high-expansion foam tank unit, the high-expansion foam tank unit is located in a foam room, seawater enters the high-expansion foam tank unit and is mixed with anti-alcohol type high-expansion foam liquid to form mixed liquid, and the mixed liquid is mixed with the high-expansion foam tank unit. The mixed liquid is conveyed to the foam generator of each protected area through a pipeline, and the mixed liquid is released to each protected area after being in contact with air in the foam generator to be expanded into foam. The high-expansion foam tank unit is composed of a foam tank, an electric valve, a foam pump, a pump outlet pressure gauge, a stop check valve, a proportional mixer and a proportional mixer front seawater inlet pressure gauge. According to the invention, the alcohol-resistant high-expansion foam liquid is used for replacing the original common high-expansion foam liquid, so that the reliability of the system function is ensured, the system can be suitable for extinguishing methanol fire, the problem that the traditional common high-expansion foam system cannot extinguish methanol fire is solved, and a series of influences caused by changing into a CO2 fire extinguishing system are avoided.

Description

Technical Field

[0001] The invention belongs to the field of construction and design of very large crude oil tankers, and in particular relates to an alcohol-resistant high-exponential foam system for a cabin of a methanol-fueled very large oil tanker. Background Art

[0002] Machinery spaces where engines burning methanol fuel are arranged should be protected by a fixed fire extinguishing system that meets the requirements. In addition, the fire extinguishing agent used should be suitable for extinguishing methanol fires.

[0003] For methanol dual-fuel powered VLCCs, the engine room is equipped with a methanol dual-fuel powered main engine, and a fixed fire extinguishing system suitable for extinguishing methanol fires should be installed in the engine room for protection. However, for economic reasons, VLCCs currently generally install a fixed high-expansion foam fire extinguishing system in the engine room, but ordinary high-expansion foam cannot extinguish methanol fires. Unless there is an alcohol-resistant high-expansion foam fire extinguishing system, the engine room high-expansion foam fire extinguishing system can only be changed to a CO2 fire extinguishing system, which will result in a series of major modifications, and the CO2 fire extinguishing system is more expensive than the high-expansion foam system.

[0004] Since the original ordinary high-expansion foam system cannot extinguish methanol fires, if an alcohol-resistant high-expansion foam system cannot be found, it can only be replaced with a CO2 fire extinguishing system, but the CO2 fire extinguishing system is expensive and requires major modifications to the existing ship design. The engine room alcohol-resistant high-expansion foam system uses alcohol-resistant high-expansion foam liquid to replace the original ordinary high-expansion foam liquid, completing the matching of the new alcohol-resistant high-expansion foam liquid with the conventional high-expansion foam system, ensuring the reliability of the system function and being suitable for extinguishing methanol fires, solving the pain point that the traditional ordinary high-expansion foam system cannot extinguish methanol fires, and avoiding a series of impacts caused by the change to the CO2 fire extinguishing system. It has determined the direction for the selection of fixed fire extinguishing systems in the engine rooms of future methanol-fueled ultra-large oil tankers, which plays a decisive role. Summary of the invention

[0005] In order to solve the above problems, the present invention provides an alcohol-resistant high-expansion foam system for the engine room of a methanol-fueled ultra-large oil tanker, aiming to achieve the purpose of economically and effectively extinguishing fires in ultra-large methanol-fueled oil tankers. The technical solution adopted is:

[0006] The invention discloses an alcohol-resistant high-exponential foam system for the engine room of a methanol-fueled ultra-large oil tanker. The system comprises a high-exponential foam tank unit, which is located in a foam room. Seawater enters the high-exponential foam tank unit and mixes with alcohol-resistant high-exponential foam liquid to form a mixed liquid. The mixed liquid is transported to foam generators in each protected area via a pipeline. The mixed liquid expands into foam after contacting with air in the foam generator and is then released to each protected area.

[0007] The high-expansion foam tank unit consists of a foam tank, an electric valve, a foam pump, a pump outlet pressure gauge, a stop check valve, a proportioning mixer, and a seawater inlet pressure gauge before the proportioning mixer; the seawater enters the proportioning mixer and is mixed with the alcohol-resistant high-expansion foam liquid in proportion to form a mixed liquid.

[0008] The foam generator has a cylindrical cavity, the front end of the cavity is a conical cavity, the conical cavity is covered with round holes, and the foam is ejected outward from the round holes.

[0009] The above-mentioned methanol-fueled ultra-large oil tanker's engine room alcohol-resistant high-multiple foam system, further, the foam tank is connected to the proportioning mixer through a pipeline, and an electric valve, a foam pump, a pump outlet pressure gauge, and a stop check valve are sequentially arranged on the passage from the foam tank to the proportioning mixer.

[0010] The above-mentioned methanol-fueled VLCC engine room alcohol-resistant high-exponential foam system, further, the foam generator is connected to the mixed liquid delivery pipeline through a flange, and is fixed below the mixed liquid delivery pipeline through an angle steel.

[0011] The above-mentioned alcohol-resistant high-exponential foam system for the engine room of a methanol-fueled very large oil tanker, further, mixes seawater and the alcohol-resistant high-exponential foam liquid in a ratio of 98:2.

[0012] The above-mentioned methanol-fueled ultra-large oil tanker's engine room alcohol-resistant high-multiple foam system, further, the seawater comes from the deck seawater fire extinguishing system, the seawater fire extinguishing system is connected to the proportioning mixer, and the pipeline from the seawater fire extinguishing system to the proportioning mixer is sequentially provided with valves, seawater pipeline filters, seawater pipeline solenoid valves, and seawater inlet pressure gauges.

[0013] The above-mentioned methanol-fueled VLCC engine room alcohol-resistant high-exponential foam system, further, allows the mixed liquid to enter each protected area via a release distribution valve.

[0014] The above-mentioned methanol fuel VLCC engine room anti-alcohol high-expansion foam system, further, the protected area includes the engine room, oil purifier room, pump room, control room

[0015] The present invention uses alcohol-resistant high-expansion foam liquid to replace the original common high-expansion foam liquid, completes the matching of the new alcohol-resistant high-expansion foam liquid and the conventional high-expansion foam system, ensures the reliability of the system function and can be applied to extinguishing methanol fires, solves the pain point that the traditional common high-expansion foam system cannot extinguish methanol fires, and avoids a series of effects caused by changing to a CO2 fire extinguishing system. It determines the direction for the selection of engine room fixed fire extinguishing systems for future methanol-fueled ultra-large oil tankers and plays a decisive role. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the system of the present invention;

[0017] Figure 2 is a schematic diagram of the structure of a foam generator;

[0018] Among them: 1-valve, 2-seawater pipeline filter, 3-seawater pipeline solenoid valve, 5-foam tank, 6-electric valve, 7-foam pump, 8-pump outlet pressure gauge, 9-stop check valve, 10-proportional mixer, 11-seawater inlet pressure gauge, 12~15-release distribution valve, 16-foam generator, 17-flange, 18-angle steel. DETAILED DESCRIPTION

[0019] The present invention will be further described in conjunction with the accompanying drawings.

[0020] A methanol fueled VLCC engine room alcohol resistant high-expansion foam system, such as Figure 1 As shown, the high-multiplicity foam tank unit 4 is integrated into a skid, which includes a foam tank 5, an electric valve 6, a foam pump 7, a pump outlet pressure gauge 8, a stop check valve 9, a proportioning mixer 10, and a seawater inlet pressure gauge 11 before the proportioning mixer.

[0021] The alcohol-resistant high-multiple foam liquid is stored in the foam tank 5. The alcohol-resistant high-multiple foam liquid enters the foam pump 7 through the normally closed electric valve 6 at the outlet of the foam tank 5. The pressure gauge 8 at the outlet of the foam pump 7 is used to display the pump outlet pressure. The alcohol-resistant high-multiple foam liquid is transported to the proportioning mixer 10 through the stop check valve 9. The stop check valve 9 can prevent the fire-fighting seawater from entering the foam pump 7. The seawater from the deck seawater fire-fighting system passes through the valve 1, the seawater pipeline filter 2, and the seawater pipeline solenoid valve 3. The pressure gauge 11 is used to display the seawater pressure at the inlet of the proportioning mixer 10. The seawater enters the proportioning mixer 10 and is mixed with the alcohol-resistant high-multiple foam liquid in a ratio of 98:2. The mixed liquid is transported to the foam generator 16 in the protected area through the release distribution valves 12, 13, 14, and 15. The mixed liquid contacts with the air in the foam generator 16 and expands into foam and is released to the protected area. A typical diagram of the foam generator 16 is shown in FIG. Figure 2 This alcohol-resistant high-expansion foam fire extinguishing system can extinguish alcohol fires and meet regulatory requirements.

[0022] The present invention uses alcohol-resistant high-expansion foam liquid to replace the original common high-expansion foam liquid, completes the matching of the new alcohol-resistant high-expansion foam liquid and the conventional high-expansion foam system, ensures the reliability of the system function and can be applied to extinguishing methanol fires, solves the pain point that the traditional common high-expansion foam system cannot extinguish methanol fires, and avoids a series of effects caused by changing to a CO2 fire extinguishing system. It determines the direction for the selection of engine room fixed fire extinguishing systems for future methanol-fueled ultra-large oil tankers and plays a decisive role.

Claims

1. A methanol fueled VLCC engine room alcohol resistant high-expansion foam system, characterized in that: The system includes a high-expansion foam tank unit, which is located in the foam room. Seawater enters the high-expansion foam tank unit and mixes with the alcohol-resistant high-expansion foam liquid to form a mixed liquid, which is transported to the foam generators in each protected area through pipelines. The mixed liquid contacts the air in the foam generator and expands into foam, which is then released to each protected area. The high-expansion foam tank unit is composed of a foam tank (5), an electric valve (6), a foam pump (7), a pump outlet pressure gauge (8), a stop check valve (9), a proportioning mixer (10), and a seawater inlet pressure gauge (11) before the proportioning mixer; seawater enters the proportioning mixer and is mixed with the alcohol-resistant high-expansion foam liquid in proportion to form a mixed liquid; The foam generator (16) has a cylindrical cavity, the front end of which is a conical cavity, the conical cavity is covered with round holes, and the foam is ejected outwards from the round holes.

2. The alcohol-resistant high-expansion foam system for the engine room of a methanol-fueled VLCC according to claim 1, characterized in that: The foam tank is connected with the proportion mixer through a pipeline, and an electric valve, a foam pump, a pump outlet pressure gauge and a stop check valve are arranged in sequence on the passage from the foam tank to the proportion mixer.

3. The alcohol-resistant high-expansion foam system for the engine room of a methanol-fueled VLCC according to claim 1, characterized in that: The foam generator is connected to the mixed liquid delivery pipeline via a flange (17) and is fixed below the mixed liquid delivery pipeline via an angle steel (18).

4. The alcohol-resistant high-expansion foam system for the engine room of a methanol-fueled VLCC according to claim 1, characterized in that: Seawater and alcohol-resistant high-expansion foam liquid are mixed in a ratio of 98:

2.

5. The alcohol-resistant high-expansion foam system for the engine room of a methanol-fueled VLCC according to claim 1, characterized in that: The seawater comes from the deck seawater fire extinguishing system, which is connected to the proportioning mixer. A valve (1), a seawater pipeline filter (2), a seawater pipeline solenoid valve (3), and a seawater inlet pressure gauge are sequentially arranged on the pipeline from the seawater fire extinguishing system to the proportioning mixer.

6. The alcohol-resistant high-expansion foam system for the engine room of a methanol-fueled VLCC according to claim 1, characterized in that: The mixed liquid enters each protected area through the release distribution valve.

7. The alcohol-resistant high-expansion foam system for the engine room of a methanol-fueled VLCC according to claim 1 or 6, characterized in that: The protected area includes the engine room, oil purifier room, pump room and control room.

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