CN216046897U - Multi-user combined air supply unit for low-flash-point fuel - Google Patents

Abstract

The utility model relates to a low-flash-point fuel multi-user combined gas supply unit, and belongs to the technical field of ship energy utilization. The device comprises an airtight valve box, a gas pipeline, a nitrogen blowing system, a control system and a negative pressure ventilation protection system; a gas pipeline and a nitrogen blowing system communicated with the gas pipeline are arranged in the airtight valve box; a negative pressure ventilation protection system is arranged on the airtight valve box; the control system is respectively connected with the gas pipeline, the nitrogen blowing system and the negative pressure ventilation protection system; the number of the gas pipelines is multiple; each gas pipeline is provided with a gas inlet and a gas outlet on the airtight valve box respectively; each gas pipeline in the airtight valve box is provided with an emergency cut-off gas valve. The isolating device with the leakage detection, valve group response and air draft protection functions, which integrates the emergency cut-off of a fuel gas supply pipeline, nitrogen purging and combustible gas detection, is beneficial to the safety and the operation flexibility of a ship gas supply system.

Description

Multi-user combined air supply unit for low-flash-point fuel

Technical Field

The utility model relates to a low-flash-point fuel multi-user combined gas supply unit, and belongs to the technical field of ship energy utilization.

Background

In order to fully meet the worldwide sulphur limit (fuel with a sulphur content of more than 0.5% must not be used) regulations in 2020, and also to fully comply with the relevant goals set forth by paris agreement on climate change and IMO regulations on how to reduce greenhouse gas emissions, more and more ships have used LNG as fuel. The use of LNG as a fuel enables ships to reduce 25% of carbon dioxide emissions, 99% of sulfur emissions, 99% of fine particle emissions, and 85% of nitrogen oxide emissions, as compared to the traditional use of heavy oil as a fuel, and will also improve the performance of the EEDI by 20%. In addition, the preliminary strategy of shipping industry emission reduction, which is passed by IMO in 2018 and 4, is dedicated to 2030, and the emission of carbon dioxide of each transportation unit of a ship is reduced by 40% compared with 2008 and 70% compared with 2050. Meanwhile, the total emission by 2050 is reduced by 50% compared with 2008, and the method gradually moves towards a zero-carbon target. LNG will be increasingly widely used as a clean energy source regarded as an ideal green transition energy source. However, the use of LNG as a low flash point fuel places even more stringent requirements on the safety design of ships. For this reason, international maritime organization maritime safety committee at 95 th meeting of 2015 passed international rules for safety of ships using gas or low flash point fuels (IGF rules). It is a goal and risk based rule that includes the goal and functional requirements of using low flash point fuels during ship design, construction and operation. The passing of the IGF rule enables the design, construction and operation of international Liquefied Natural Gas (LNG) powered ships to obtain a clear rule for following, and promotes the development of LNG powered ships to move to a new step.

How to prevent leakage of the gas pipe is a safety issue that needs to be considered in the design stage. IGF specifies that gas piping in a safe area, such as the ship's shelters, may take the form of double-walled pipes to prevent gas leakage to the safe area. Meanwhile, an exhaust fan is arranged for the double-wall pipe, and fuel gas leaked accidentally between the inner wall and the outer wall of the double-wall pipe is extracted. In addition, when unexpected emergency shutdown, the gas pipeline is promptly cut off to the emergent trip valve, and nitrogen system need sweep partial gas pipeline to ensure not have residual gas in the pipeline, avoid producing the risk of revealing. The emergency shut-off valve controlling the gas supply should be as close as possible to the cabin users. Normally, the cabin and the adjacent places are safe areas, but if an emergency shut-off valve is arranged in a certain area, the area is changed into a type I dangerous area, and all equipment in the area meets higher requirements. Moreover, a plurality of gas users, such as a host, a generator set, a boiler and the like, are arranged in the engine room, and a separate emergency shut-off valve and a corresponding nitrogen purging system are required to be arranged for each user. If the control valves are relatively dispersed, inconvenience is brought to operation management, and greater potential safety hazard is brought.

Disclosure of Invention

The utility model aims to solve the technical problems of how to safely use gas and prevent the leakage of a gas pipeline.

In order to solve the problems, the technical scheme adopted by the utility model is to provide a low-flash-point fuel multi-user combined gas supply unit, wherein fuel is connected to each fuel gas user of an engine room through the gas supply unit, and the low-flash-point fuel multi-user combined gas supply unit comprises an airtight valve box, a fuel gas pipeline, a nitrogen blowing system, a control system and a negative pressure ventilation protection system; a gas pipeline and a nitrogen blowing system communicated with the gas pipeline are arranged in the airtight valve box; a negative pressure ventilation protection system is arranged on the airtight valve box; the control system is respectively connected with the gas pipeline, the nitrogen blowing system and the negative pressure ventilation protection system; the number of the gas pipelines is multiple; each gas pipeline is provided with a gas inlet and a gas outlet on the airtight valve box respectively; each gas pipeline in the airtight valve box is provided with an emergency cut-off gas valve.

Preferably, the control system comprises an electromagnetic valve group and an electromagnetic valve control box for controlling the nitrogen blowing system, a remote control valve control box for controlling the emergency cut-off gas valve, and a fan control box for controlling the negative pressure ventilation protection system.

Preferably, the nitrogen purging system comprises a nitrogen inlet, a nitrogen purge valve, a release valve, a bleed valve, a check valve, and a release outlet; a nitrogen inlet and a release outlet are arranged on the box body of the airtight valve box; a nitrogen purging valve, a check valve and a release valve are sequentially arranged between the nitrogen inlet and the release outlet; the check valve and the release valve share a pipeline with a gas pipeline; an emergency cut-off gas valve is arranged on a gas pipeline between the check valve and the release valve; and a discharge valve is arranged between the nitrogen purging valve and the check valve.

Preferably, a nitrogen pressure gauge is arranged on the pipeline close to the nitrogen inlet.

Preferably, the solenoid valve group comprises a control air inlet, a control air outlet and a plurality of solenoid valves; the control air inlet is connected with the control air outlet through an electromagnetic valve; the control air outlet is respectively connected with the nitrogen purging valve, the relief valve and the release valve; the plurality of electromagnetic valves are connected with the electromagnetic valve control box.

Preferably, a hydraulic unit for switching the emergency cutoff gas valve is arranged between the remote control valve control box and the emergency cutoff gas valve.

Preferably, the negative pressure ventilation protection system comprises a housing ventilation outlet, a housing ventilation inlet, an explosion-proof exhaust fan, an air outlet, an air inlet, a gas detection device and a valve box pressure gauge; the airtight valve box is provided with a housing ventilation outlet and a housing ventilation inlet; the housing ventilation inlet is connected with the air inlet, and the housing ventilation outlet is connected with the air outlet; an explosion-proof exhaust fan is arranged between the housing ventilation outlet and the air outlet; and the airtight valve box is provided with a gas detection device and a valve box pressure gauge.

Preferably, a flame retardant device and a throttle orifice plate are sequentially arranged between the air inlet and the housing ventilation inlet.

Preferably, two anti-explosion exhaust fans are arranged, and a non-return air brake is arranged between each anti-explosion exhaust fan and the air outlet; the fan control box is connected with the explosion-proof exhaust fan.

Preferably, a valve box pressure sensor is arranged on the valve box pressure gauge and connected with the fan control box.

Compared with the prior art, the utility model has the following beneficial effects:

aiming at the technical problems in the prior art, the utility model replaces a room meeting the requirements of I-type dangerous areas with special equipment, centrally manages the control valve banks of a plurality of users, integrates the functions of leakage detection, valve bank response, air draft protection and the like, simplifies the operation of personnel, optimizes the arrangement space and improves the safety of system operation. Meanwhile, the emergency cut-off valve in the unit is linked with the main valve in the gas treatment room, and a gas pipeline between the two valves can be free from automatic purging, so that the restarting time of a gas system is reduced, and the efficiency is improved.

Drawings

FIG. 1 is a schematic diagram of the system of the present invention;

FIG. 2 is a diagram of the internal principles and interfaces of the valve box of the present invention;

FIG. 3 is an internal principle and interface diagram of the solenoid valve assembly of the present invention;

FIG. 4 is a system flow of normal gas supply according to the present invention;

FIG. 5 is a system flow of the present invention when purging the downstream pipeline of the main gas valve for emergency shut-off;

FIG. 6 is a system flow of the present invention when releasing the upstream pipeline of the main gas valve for emergency shut-off;

FIG. 7 is a system flow for maintaining the negative pressure in the valve box according to the present invention;

reference numerals: 1. a valve box; 2. an electromagnetic valve group; 3. an explosion-proof exhaust fan; 4. a non-return air brake; 5. an air outlet; 6. an air inlet; 7. a flame arrester; 8. a restriction orifice plate; 9. a solenoid valve control box; 10. a remote control valve control box; 11. a hydraulic unit; 12. a fan control box; 13. cutting off a gas valve in an emergency; 14. a nitrogen purge valve; 15. a release valve; 16. a relief valve; 17. a check valve; 18. a nitrogen pressure gauge; 19. a temperature sensor; 20. a valve box pressure gauge; 21. a valve box pressure sensor; 22. a gas detection device; 23. an airtight valve housing enclosure; 24. a gas inlet; 25. a release outlet; 26. a gas outlet; 27. a housing vent inlet; 28. a nitrogen inlet; 29. a housing vent outlet; 30. controlling the air interface; 31. an electromagnetic valve; 32. a pressure gauge; 33. controlling the air inlet; 34. controlling the air outlet; 35. an air filter.

Detailed Description

In order to make the utility model more comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings:

as shown in fig. 1-7, the technical solution adopted by the present invention is to provide a low flash point fuel multi-user combined gas supply unit, wherein the fuel is connected to each gas user in the engine room through the gas supply unit, and the low flash point fuel multi-user combined gas supply unit comprises a gas tight valve box 1, a gas pipeline, a nitrogen blowing system, a control system and a negative pressure ventilation protection system; a gas pipeline and a nitrogen blowing system communicated with the gas pipeline are arranged in the airtight valve box 1; a negative pressure ventilation protection system is arranged on the airtight valve box 1; the control system is respectively connected with the gas pipeline, the nitrogen blowing system and the negative pressure ventilation protection system; the number of the gas pipelines is multiple; each gas pipeline is provided with a gas inlet 24 and a gas outlet 26 on the airtight valve box 1 respectively; each gas pipeline in the airtight valve box 1 is respectively provided with an emergency cut-off gas valve 13. The control system comprises an electromagnetic valve group 2 and an electromagnetic valve control box 9 for controlling the nitrogen blowing system, a remote control valve control box 10 for controlling an emergency cut-off gas valve 13 and a fan control box 12 for controlling the negative pressure ventilation protection system. The nitrogen purging system comprises a nitrogen inlet 28, a nitrogen purge valve 14, a release valve 15, a bleed valve 16, a check valve 17 and a release outlet 25; a nitrogen inlet 28 and a release outlet 25 are arranged on the box body of the airtight valve box 1; a nitrogen purge valve 14, a check valve 17 and a release valve 15 are sequentially arranged between the nitrogen inlet 28 and the release outlet 25; a pipeline shared with a gas pipeline is arranged between the check valve 17 and the release valve 15; an emergency cut-off gas valve 13 is arranged on a gas pipeline between the check valve 17 and the release valve 15; a relief valve 16 is provided between the nitrogen purge valve 14 and the check valve 17. A nitrogen pressure gauge 18 is provided on the piping adjacent to the nitrogen inlet 28. The solenoid valve group 2 comprises a control air inlet 33, a control air outlet 34 and a plurality of solenoid valves 31; the control air inlet 33 is connected with the control air outlet 34 through the electromagnetic valve 31; the control air outlet 34 is respectively connected with the nitrogen purge valve 14, the relief valve 16 and the release valve 15; the plurality of solenoid valves 31 are connected to the solenoid valve control box 9. A hydraulic unit 11 for switching the emergency cutoff gas valve is arranged between the remote control valve control box 10 and the emergency cutoff gas valve 13. The negative pressure ventilation protection system comprises a housing ventilation outlet 29, a housing ventilation inlet 27, an explosion-proof exhaust fan 3, an exhaust outlet 5, an air inlet 6, a gas detection device 22 and a valve box pressure gauge 20; the airtight valve box 1 is provided with a housing ventilation outlet 29 and a housing ventilation inlet 27; the housing ventilation inlet 27 is connected with the air inlet 6, and the housing ventilation outlet 29 is connected with the air outlet 5; an explosion-proof exhaust fan 3 is arranged between the housing ventilation outlet 29 and the air outlet 5; the airtight valve box 1 is provided with a gas detection device 22 and a valve box pressure gauge 20. A flame retardant device 7 and a throttle orifice plate 8 are sequentially arranged between the air inlet 6 and the housing ventilation inlet 27. Two anti-explosion exhaust fans 3 are arranged, and a non-return air brake 4 is arranged between the anti-explosion exhaust fans 3 and the air outlet 5; the fan control box 12 is connected with the explosion-proof exhaust fan 3. A valve box pressure sensor 21 is arranged on the valve box pressure gauge 20, and the valve box pressure sensor 21 is connected with the fan control box 12.

Aiming at the problems in the prior art, a special room is arranged before a gas pipeline enters a cabin and is used for centralized management of gas pipes leading to users of each cabin in a gas processing room, and the area is designed according to a type I dangerous area. The room needs to be provided with an emergency cut-off valve for a gas pipeline, a purging valve for nitrogen purging, a release valve, equipment for combustible gas detection and the like. However, IGF has high safety requirements for places of class I dangerous areas where people can enter, and usually needs to be provided with an air lock and an independent escape channel, so that a large amount of space is occupied, and optimal arrangement of ships is not facilitated.

The utility model provides an isolating device with leakage detection, valve bank response and air draft protection functions, which integrates the functions of emergency cut-off of a fuel gas supply pipeline, nitrogen purging and combustible gas detection, and the isolating device is named as a multi-user air supply protection combined unit of a dual-fuel ship engine room. The device can be arranged in the cabin of a dual-fuel ship or in a safe area close to gas users, and each gas supply pipeline is connected to the device before entering each user in the cabin. The device consists of emergency pipeline cut-off valves of all tail end gas users, purge valves, release valves, check valves, combustible gas detectors and other valve accessories of a nitrogen system. The shell is an airtight negative pressure protection cover shell and is connected with two special exhaust fans to be pumped to an appointed open air exhaust area of the ship so as to ensure that any fuel gas is not leaked to the inside of the engine room.

The specific technical scheme is as follows, and the air supply protection combination unit has the following characteristics:

the unit includes several ports: the system comprises a main machine, a generator set, an inlet interface of a gas supply double-wall pipe of a boiler and outlets of respective upstream nitrogen release pipes; the outlets of the gas supply double-wall pipes of the main engine, the auxiliary engine and the boiler and the inlets of the nitrogen purging pipes at the downstream of the outlets; the internal pipelines to each user are mutually independent and do not interfere with each other, and the pipelines of each user are provided with a hydraulic remote control emergency cut-off valve 13, a nitrogen purge valve 14, a check valve 17, a remote control discharge valve 16 and the like. All remote control valves in the combination unit are hydraulically or pneumatically controlled. A set of solenoid valve sets 2 is associated with the gas alarm system outside the unit for controlling the air supply to the pneumatic purge valves 14. The release valve 15 for nitrogen purging in the unit is associated with the emergency shut-off gas main valve, and the nitrogen purging action can be activated only after the emergency shut-off gas main valve performs a closing operation. The combined unit is internally provided with accessories such as a combustible gas detection device 22, a pressure sensor 21, a temperature sensor 19 and the like. The combustible gas detection device 22 can monitor the state in the unit in real time whether gas leaks. The gas detection signal is connected with the gas alarm system and the gas emergency cut-off system, so that the gas supply is cut off at the highest speed under the emergency condition. The outer cover of the combined unit is provided with a pipeline interface connected with the exhaust fan, and the two exhaust fans which are mutually standby and automatically switched provide negative pressure for the housing. When the combustible gas leaks, the combustible gas is sucked to a specific place by the suction fan. When the emergency cut-off valve 13 in the combined unit and the main valve of the interlocked external gas processing room are cut off in an emergency, the gas pipeline between the two valves can not execute nitrogen purging operation.

As shown in fig. 1-7, the present invention provides a low flash point fuel multi-user combination gas supply unit comprising a gas tight valve box housing 23 and internal emergency shut-off valves 13 for multiple users. The gas supply lines from the gas treatment space first pass through the housing of this gas-tight valve box 1, via emergency shut-off gas valves, and are then connected to the individual gas users of the cabin.

And each gas supply pipe in the housing is respectively provided with a set of nitrogen blowing system for blowing the combustible gas in the gas supply pipe when the emergency cut-off valve 13 acts, so that the risk that the combustible gas is leaked to the engine room when the gas pipe is in a user closing state is avoided.

The valve group and accessories in the protection unit are not limited to protect one engine room gas user, but simultaneously protect one or more engine room gas users, such as a dual-fuel main engine, an auxiliary engine and a boiler.

The device can be arranged in the engine room or in a safety area with a short distance from a gas user.

The emergency cut-off gas valves are hydraulically-driven remote control valves and are interlocked with main valves of corresponding users in the gas processing room, and when an alarm signal of emergency cut-off is triggered, two valves on the same user pipeline are simultaneously cut off in an emergency mode.

When the emergency cut-off gas valve of a single user works, other users cannot be influenced and the emergency cut-off gas valve can still work normally.

The nitrogen purging system comprises a set of purge valves 14, check valves 17 and release valves 15. Wherein the blow-off valve 14 and the release valve 15 are pneumatically controlled by the solenoid valve set 2 outside the valve box.

Wherein, the control signals of the nitrogen blow-off valve 14 and the release valve 15 are provided by the gas processing system and are interlocked with the gas main valve; when the main valve is closed, the blow-off valve 14 and the release valve 15 can be opened and the blow-off operation is performed.

When the emergency shut-off valve 13 in the protection unit is closed and the interlocked gas main valve is closed, the gas line between the two valves may not perform the purging operation.

The cover shell is an airtight closed unit and is provided with an airtight hole cover for maintenance; the pipes are passed through the housing by means of gas-tight chamber-penetrating elements. Two mutually-standby exhaust fans which are automatically switched provide negative pressure for the shells, and when combustible gas leaks, the combustible gas can be pumped to a specific place by the exhaust fans. The inlet and outlet of the exhaust fan are all located in a safe area, but the openings of the exhaust fan generate a dangerous area with the radius of 4.5 meters.

Combustible gas detector has been installed to convulsions exit in the housing, in case gas leakage, can detect the warning and trigger corresponding emergent cutting off. The enclosure is considered to be a type I dangerous area, and all the electric elements need to meet the requirement of explosion-proof grade.

Examples

FIG. 1 is a system schematic diagram of a multi-user air supply combined protection unit of a dual-fuel marine engine room of the utility model;

FIG. 2 is a diagram of the internal principles and interfaces of the valve box of the present invention; FIG. 3 is an internal principle and interface diagram of the solenoid valve assembly of the present invention; FIG. 4 is a system flow of normal gas supply according to the present invention; FIG. 5 is a system flow of the present invention during purging emergency shut-off of the downstream line of the main gas valve; FIG. 6 is a system flow of the present invention in releasing the emergency shut-off of the upstream line of the main gas valve; fig. 7 is a system flow of the present invention for maintaining the negative pressure in the valve box.

As shown in fig. 1, the dual-fuel marine engine room multi-user air supply combined protection unit system provided by this embodiment includes: the device comprises a valve box 1, an electromagnetic valve group 2, an explosion-proof exhaust fan 3, a non-return air brake 4, an air outlet 5, an air inlet 6, a flame retardant device 7, a throttling orifice plate 8, an electromagnetic valve control box 9, a remote control valve control box 10, a hydraulic unit 11 and a fan control box 12.

As shown in fig. 2, the valve box provided by this embodiment includes: the emergency shut-off gas valve 13, the nitrogen purge valve 14, the release valve 15, the release valve 16, the check valve 17, the nitrogen pressure gauge 18, the temperature sensor 19, the valve box pressure gauge 20, the valve box pressure sensor 21, the gas detection device 22, the airtight valve box housing 23, the gas inlet 24, the release outlet 25, the gas outlet 26, the housing ventilation inlet 27, the nitrogen inlet 28, the housing ventilation outlet 29 and the control air interface 30.

As shown in fig. 3, the solenoid valve assembly provided in this embodiment includes: solenoid valve 31, pressure gauge 32, control air inlet 33, control air outlet 34, air filter 35.

Specifically, in a dual-fuel ship gas supply system, a valve box 1 and an electromagnetic valve group 2 are arranged in an engine room area, and a fuel gas inlet 24 is connected with an upstream gas fuel pipeline; the gas outlet 26 of the valve box 1 is connected to the pipes (host, generator set, boiler, etc.) of each user; in particular, the gas outlet 26-2 of the valve box 1 provides a way for a single emergency shutdown gas valve 13-2 to control multiple users; the control air connection 30 of the valve box 1 is connected to the control air outlet 34 of the solenoid valve group 2; the release port 25 of the valve box 1 is connected with an independent vent pipe to an open area; the housing ventilation inlet 27 of the valve box 1 is connected with the air inlet 6 of the open safety area; the housing ventilation outlet 29 of the valve box 1 is connected with the explosion-proof exhaust fan 3; the nitrogen inlet 28 of the valve box 1 is connected with a ship nitrogen system; the control air inlet 33 of the solenoid valve block 2 is connected to the ship control air system.

Specifically, the emergency cut-off gas valve 13 of the valve box 1 is controlled by a remote control valve control box 10, a hydraulic unit 11 and a temperature sensor 19; the nitrogen purge valve 14, the release valve 15 and the relief valve 16 of the valve box 1 are controlled by the electromagnetic valve control box 9 through the electromagnetic valve group 2; the explosion-proof exhaust fan 3 is controlled by a fan control box 12 and a valve box pressure sensor 21.

Specifically, as shown in fig. 4, the emergency cutoff gas valve 13 is opened, the nitrogen purge valve 14, the release valve 15 and the bleed valve 16 are all kept closed, and the upstream gas pipeline and the downstream gas pipeline of the valve box 1 are communicated;

as shown in fig. 5, the nitrogen purge valve 14 is opened, the emergency shut-off gas valve 13, the release valve 15 and the bleed valve 16 are all kept closed, so that the nitrogen purge is performed on the downstream pipe section of the emergency shut-off gas valve 13;

as shown in fig. 6, the relief valve 15 is opened, the emergency shutoff gas main valve, the nitrogen purge valve 14, and the bleed valve 16 are all kept closed, and the gas in the upstream pipe section corresponding to the emergency shutoff gas valve 13 is released by the self pressure and the upstream purge nitrogen.

More specifically, the emergency cut-off gas valve 13 is of a failure-off type, and is opened by maintaining hydraulic pressure through the hydraulic unit 11, and is closed by an internal spring when the hydraulic unit 11 or a hydraulic pipe fails, so that gas supply is automatically cut off; the nitrogen purging valve 14 and the release valve 15 are of failure opening type, the valve opening state is kept by a built-in spring, the electromagnetic valve group 2 provides control air to close the valve, and when the electromagnetic valve group 2 or a control air system fails, the purging and the upstream and downstream gas pipelines are automatically opened for purging and releasing.

More specifically, each path of emergency cut-off gas valve 13, the nitrogen purge valve 14, the release valve 15 and the relief valve 16 can work independently, and the use of other users is not influenced.

Specifically, as shown in fig. 7, the air inside the housing of the valve box 1 is exhausted to the atmosphere through the housing ventilation outlet 29, the explosion-proof exhaust fan 3, the check damper 4 and the exhaust outlet 5, and the air is sucked in through the air inlet 6, the flame arrester 7, the orifice plate 8 and the housing ventilation inlet 27, so that negative pressure protection is formed inside the housing.

More specifically, the flow area of the throttling orifice plate 8 is adjusted, so that the vacuum degree requirement of the interior of the valve box 1 housing is about 150 mbar; when one explosion-proof exhaust fan 3 fails or the valve box pressure sensor 21 detects that the internal pressure of the housing of the valve box 1 rises to give an alarm, the other fan is automatically started through the fan control box 12, and the non-return air brake 4 can ensure that the two explosion-proof exhaust fans 3 can work independently; the gas detection device 22 is arranged at the end of the housing ventilation outlet 29 and used for detecting whether the gas pipeline in the valve box 1 leaks or not, and when the gas detection device 22 detects a leakage alarm, a signal is output to an upstream gas supply system to request to reduce or cut off gas supply, so that safety is guaranteed.

The multi-user air supply combined protection unit for the dual-fuel marine engine room comprises an airtight valve box 1, an electromagnetic valve group 2 for providing purge valve control, a negative pressure ventilation protection system consisting of an explosion-proof exhaust fan 3, a non-return air brake 4, an air outlet 5, an air inlet 6, a flame retardant device 7 and a throttling orifice plate 8, and a control system consisting of an electromagnetic valve control box 9, a remote control valve control box 10, a hydraulic unit 11 and a fan control box 12. The airtight valve box 1 is arranged between the air supply end and the engine room user end, so that the cutting-off function, the segmented purging function and the fuel gas releasing function of the air supply end and the engine room user end are realized, the problems of isolation and purging of the air supply end and the engine room user fuel gas pipeline are solved, the safety and the operation flexibility of an air supply system of a dual-fuel ship are facilitated, and the development of the ship industry is facilitated.

While the utility model has been described with respect to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the utility model. Those skilled in the art can make various changes, modifications and equivalent arrangements, which are equivalent to the embodiments of the present invention, without departing from the spirit and scope of the present invention, and which may be made by utilizing the techniques disclosed above; meanwhile, any changes, modifications and variations of the above-described embodiments, which are equivalent to those of the technical spirit of the present invention, are within the scope of the technical solution of the present invention.

Claims (10)

1. The utility model provides a low flash point fuel multi-user combination air feed unit, fuel is connected to each gas user in cabin through the air feed unit which characterized in that: the device comprises an airtight valve box, a gas pipeline, a nitrogen blowing system, a control system and a negative pressure ventilation protection system; a gas pipeline and a nitrogen blowing system communicated with the gas pipeline are arranged in the airtight valve box; a negative pressure ventilation protection system is arranged on the airtight valve box; the control system is respectively connected with the gas pipeline, the nitrogen blowing system and the negative pressure ventilation protection system; the number of the gas pipelines is multiple; each gas pipeline is provided with a gas inlet and a gas outlet on the airtight valve box respectively; each gas pipeline in the airtight valve box is provided with an emergency cut-off gas valve.

2. The multi-user combination low flash point fuel gas supply unit of claim 1, wherein: the control system comprises an electromagnetic valve group and an electromagnetic valve control box for controlling the nitrogen blowing system, a remote control valve control box for controlling the emergency cut-off gas valve and a fan control box for controlling the negative pressure ventilation protection system.

3. The multi-user combination low flash point fuel gas supply unit of claim 2, wherein: the nitrogen purging system comprises a nitrogen inlet, a nitrogen purging valve, a release valve, a discharge valve, a check valve and a release outlet; a nitrogen inlet and a release outlet are arranged on the box body of the airtight valve box; a nitrogen purging valve, a check valve and a release valve are sequentially arranged between the nitrogen inlet and the release outlet; the check valve and the release valve share a pipeline with a gas pipeline; an emergency cut-off gas valve is arranged on a gas pipeline between the check valve and the release valve; and a discharge valve is arranged between the nitrogen purging valve and the check valve.

4. The multi-user combination low flash point fuel gas supply unit of claim 3, wherein: and a nitrogen pressure gauge is arranged on the pipeline close to the nitrogen inlet.

5. The multi-user combination low flash point fuel gas supply unit of claim 4, wherein: the electromagnetic valve group comprises a control air inlet, a control air outlet and a plurality of electromagnetic valves; the control air inlet is connected with the control air outlet through an electromagnetic valve; the control air outlet is respectively connected with the nitrogen purging valve, the relief valve and the release valve; the plurality of electromagnetic valves are connected with the electromagnetic valve control box.

6. The multi-user combination low flash point fuel gas supply unit of claim 5, wherein: and a hydraulic unit for switching on and off the emergency cut-off gas valve is arranged between the remote control valve control box and the emergency cut-off gas valve.

7. The multi-user combination low flash point fuel gas supply unit of claim 6, wherein: the negative pressure ventilation protection system comprises a housing ventilation outlet, a housing ventilation inlet, an explosion-proof exhaust fan, an air outlet, an air inlet, a gas detection device and a valve box pressure gauge; the airtight valve box is provided with a housing ventilation outlet and a housing ventilation inlet; the housing ventilation inlet is connected with the air inlet, and the housing ventilation outlet is connected with the air outlet; an explosion-proof exhaust fan is arranged between the housing ventilation outlet and the air outlet; and the airtight valve box is provided with a gas detection device and a valve box pressure gauge.

8. The multi-user combination low flash point fuel gas supply unit of claim 7, wherein: and a flame retardant device and a throttle orifice plate are sequentially arranged between the air inlet and the ventilation inlet of the housing.

9. The multi-user combination low flash point fuel gas supply unit of claim 8, wherein: the number of the explosion-proof exhaust fans is two, and a non-return air brake is arranged between the explosion-proof exhaust fans and the air outlet; the fan control box is connected with the explosion-proof exhaust fan.

10. The multi-user combination low flash point fuel gas supply unit of claim 9, wherein: and a valve box pressure sensor is arranged on the valve box pressure gauge and is connected with the fan control box.

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