CN111346322B - Oxygen safety system of unmanned airtight cabin under water - Google Patents
Oxygen safety system of unmanned airtight cabin under water Download PDFInfo
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- CN111346322B CN111346322B CN202010170879.XA CN202010170879A CN111346322B CN 111346322 B CN111346322 B CN 111346322B CN 202010170879 A CN202010170879 A CN 202010170879A CN 111346322 B CN111346322 B CN 111346322B
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C3/00—Fire prevention, containment or extinguishing specially adapted for particular objects or places
- A62C3/07—Fire prevention, containment or extinguishing specially adapted for particular objects or places in vehicles, e.g. in road vehicles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63C—LAUNCHING, HAULING-OUT, OR DRY-DOCKING OF VESSELS; LIFE-SAVING IN WATER; EQUIPMENT FOR DWELLING OR WORKING UNDER WATER; MEANS FOR SALVAGING OR SEARCHING FOR UNDERWATER OBJECTS
- B63C11/00—Equipment for dwelling or working underwater; Means for searching for underwater objects
- B63C11/52—Tools specially adapted for working underwater, not otherwise provided for
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Abstract
An oxygen safety system of an underwater unmanned closed cabin comprises a liquid oxygen storage tank, an oxygen compressor, a high-pressure oxygen buffer tank set, a deoxidant, a molecular sieve oxygen generator, an air compressor, a rupture membrane, a pneumatic valve, a one-way valve, a stop valve, a sealed cabin, a safety valve, a pressure sensor, an oxygen concentration sensor, a pressure gauge and the like. The tail exhaust oxygen that can effectual absorption fuel cell pile operation produced and pipeline reveal produced oxygen, realized that the oxygen concentration of guaranteeing in the airtight cabin all is below the safe concentration range when carrying platform under water takes place the oxygen leakage or the oxygen tail of different condition, different grades and arranges, prevents that the cabin from taking place conflagration or explosion, realizes the nitrogen gas cyclic utilization in the airtight cabin, and factor of safety is high.
Description
Technical Field
The invention relates to the field of safety and guarantee equipment of an underwater carrying platform, in particular to an oxygen safety system of an underwater unmanned closed cabin.
Background
In recent years, with the continuous promotion and implementation of the national oceanic strategy, the requirements on the exploration and development capacity of deep sea resources and the observation capacity of marine organisms and environment are higher and higher, under the condition that the demand is led, an underwater carrying platform is applied, the problems of efficiency, energy density and emission of the system are important for the underwater carrying platform with large depth, and the fuel cell is realized as an underwater equipment power system based on the excellent characteristics of the fuel cell in the aspects, and attracts the wide attention of many developed countries. The proton exchange membrane fuel cell is relatively wide in view of the underwater application condition of the current domestic and foreign fuel cells, and is used as a novel electricity generating device based on electrochemistry, and chemical energy is directly converted into electric energy through electrochemical reaction of hydrogen and oxygen, so that the load is continuously supplied with power. For an underwater carrying platform of hundreds of tons, the oxygen required by the fuel cell is generally stored in a liquid oxygen tank in a liquid oxygen mode, and the liquid oxygen is heated and vaporized into oxygen with certain pressure suitable for a galvanic pile when the underwater carrying platform is used.
In the underwater carrying platform, the area where the oxygen system is located is an unmanned sealed cabin, and for the unmanned sealed cabin of the underwater carrying platform, the influence on the safety of the oxygen system mainly comprises the following aspects: firstly, because the utilization rate of the fuel cell stack cannot reach 100%, oxygen tail gas exists during normal operation, and if no measures are taken, the oxygen tail gas can not only gradually increase the oxygen concentration in the cabin, but also increase the cabin pressure of the sealed cabin; secondly, the pipeline, the valve and the pipeline joint of the oxygen system in the sealed cabin have micro leakage, and the oxygen concentration in the cabin can be gradually increased after a period of time accumulation; if a pipeline valve in the tank is damaged or sealed to fail, the oxygen concentration in the tank can be rapidly increased, and fourthly, the liquid oxygen storage tank for storing the liquid oxygen can be subjected to vibration, impact, unqualified welding seams, expansion caused by heat, contraction caused by cold and the like, so that vacuum failure is caused, the liquid oxygen in the liquid oxygen storage tank is rapidly vaporized, the pressure of the gas oxygen in the liquid oxygen storage tank is rapidly increased, and overpressure discharge is needed when the pressure is increased to the design pressure of the liquid oxygen tank; fifthly, although a plurality of heat insulation measures are adopted for the liquid oxygen tank, a certain daily evaporation rate still exists, and when the fuel cell does not work, the liquid oxygen tank reaches the design pressure in a self-evaporation mode in less than 1 day, and then overpressure discharge is needed.
In view of the above circumstances, considering the requirement of the oxygen safety concentration of the sealed cabin of the underwater carrying platform, the requirement of the cabin safety pressure and the requirement of overpressure discharge of gas and oxygen in the liquid oxygen tank, and ensuring that the oxygen concentration of the area where the oxygen system is located in the underwater carrying platform is below the safety oxygen concentration under any circumstances, the invention provides a safety design method and a system of the oxygen system of the underwater unmanned sealed cabin, which can mainly effectively absorb tail exhaust oxygen generated by the fuel cell stack operation and oxygen generated by pipeline leakage, are used for ensuring that the oxygen concentration in the sealed cabin is below the safety range when the underwater carrying platform generates different conditions, different grades of oxygen leakage or oxygen tail exhaust, prevent the cabin from fire or explosion, realize the cyclic utilization of nitrogen in the sealed cabin, and ensure that the cabin pressure of the underwater carrying platform is within the normal range, in addition, when the overpressure occurs to the liquid oxygen tank in the cabin, the underwater carrying platform can discharge overpressure gas oxygen of the liquid oxygen tank at the working depth without floating to the water surface, and the safety of the underwater carrying platform is ensured.
Disclosure of Invention
The applicant provides an oxygen safety system for an underwater unmanned closed cabin, aiming at the defects in the prior art, so as to ensure that the oxygen concentration in the closed cabin is below a safety range when the underwater carrying platform generates different conditions and different levels of oxygen leakage or generates oxygen tail discharge, prevent the cabin from fire or explosion, ensure the cabin pressure of the underwater carrying platform to be within a normal range, realize the cyclic utilization of nitrogen in the closed cabin, prevent equipment in the cabin from being damaged due to overhigh pressure in the cabin, and ensure the safety of the underwater carrying platform by discharging overpressure gas oxygen from a liquid oxygen tank at the working depth of the underwater carrying platform when the liquid oxygen tank in the cabin generates overpressure.
The technical scheme adopted by the invention is as follows:
an oxygen safety system of an underwater unmanned closed cabin comprises a pressure-resistant closed cabin, wherein a plurality of groups of deoxidants are arranged on the inner wall surface of the pressure-resistant closed cabin, a sea-opening one-way valve is arranged outside the pressure-resistant closed cabin, an outlet of the sea-opening one-way valve enters the pressure-resistant closed cabin through a pipeline, the pipeline is connected with a liquid oxygen storage tank, and a first one-way valve, a first pneumatic valve and a first stop valve are further connected in series on the pipeline;
a pipeline between the sea-going one-way valve and the first one-way valve is connected with a high-pressure oxygen buffer tank set through a high-pressure oxygen pipeline, and a sixth pneumatic valve and a second pneumatic valve are mounted on the high-pressure oxygen pipeline;
a pipeline between the first pneumatic valve and the first stop valve is connected with a molecular sieve oxygen generator through a low-pressure oxygen pipeline, the low-pressure oxygen pipeline is also connected with a first oxygen compressor, a third one-way valve and a second oxygen compressor in parallel, the first oxygen compressor, the third one-way valve and the second oxygen compressor are simultaneously communicated with the high-pressure oxygen pipeline through pipelines, and the second one-way valve is arranged on the pipeline;
a fourth one-way valve and a rupture membrane are connected in series between a pipeline between the first one-way valve and the first pneumatic valve and the low-pressure oxygen pipeline;
the output end of the high-pressure oxygen buffer tank group is provided with a first pressure sensor;
the input end of the molecular sieve oxygen generator is sequentially connected with an air compressor, an air filter and a fourth pneumatic valve in series through a pipeline, and the input port of the fourth pneumatic valve is communicated with oxygen inside the pressure-resistant sealed cabin.
The further technical scheme is as follows:
the first deoxidant, the second deoxidant and the third deoxidant are sequentially arranged on one side of the inner wall surface of the pressure-resistant closed cabin from top to bottom at intervals, and the fourth deoxidant, the fifth deoxidant and the sixth deoxidant are sequentially arranged on the other side of the inner wall surface of the pressure-resistant closed cabin from top to bottom at intervals.
The high-pressure oxygen buffer tank is composed of three tanks, and a first safety valve, a second safety valve and a third safety valve are respectively arranged on a pipeline of an output port of each tank.
And a fourth stop valve, a third stop valve and a second stop valve are respectively connected to the pipeline of the output port of each tank of the high-pressure oxygen buffer tank group.
And a second pressure sensor is arranged at the bottom of the inner wall surface of the pressure-resistant sealed cabin.
And a third pressure sensor is arranged on the low-pressure oxygen pipeline.
And an oxygen concentration sensor is also arranged at the bottom of the inner wall surface of the pressure-resistant sealed cabin.
And a fifth pneumatic valve and a seventh stop valve are respectively arranged at two ends of the first oxygen compressor.
And a third pneumatic valve and a fifth stop valve are respectively arranged at two ends of the second oxygen compressor.
The invention has the following beneficial effects:
the invention is mainly used for absorbing tail exhaust oxygen generated by the operation of a fuel cell stack and oxygen generated by pipeline leakage, so as to ensure that the oxygen concentration in a closed cabin is below a safety range when an underwater carrying platform generates different conditions, oxygen leakage of different grades or oxygen tail exhaust, prevent the cabin from fire or explosion, ensure the cabin pressure of the underwater carrying platform to be in a normal range, realize the cyclic utilization of nitrogen in the closed cabin, prevent equipment in the cabin from being damaged due to overhigh pressure in the cabin, and when a liquid oxygen tank in the cabin generates overpressure, the underwater carrying platform can discharge the overpressure gas oxygen of the liquid oxygen tank at the working depth, thereby ensuring the safety of the underwater carrying platform.
The invention also has the following advantages:
1. the oxygen can be slowly absorbed for a long time to reduce the oxygen concentration, namely, in the whole long working period of the work of the underwater carrying platform, tail exhaust oxygen generated by the normal work of the fuel cell of the underwater carrying platform continuously, the oxygen leaked by the valve piece and the pipeline joint are effectively absorbed, so that the oxygen concentration in the closed cabin of the underwater carrying platform is always kept below the safe oxygen concentration, and the fire and explosion are prevented.
2. When the oxygen concentration of the sealed cabin rises rapidly, the oxygen concentration in the cabin can be reduced through effective measures, namely when the oxygen concentration in the sealed cabin rises rapidly due to the saturation of an oxygen scavenger or the breakage or the sealing failure of a pipeline valve in the cabin, the oxygen concentration in the sealed cabin of the underwater carrying platform can be reduced below the safe oxygen concentration rapidly.
3. When the underwater carrying platform is in a small diving depth, the active discharge and the passive discharge of overpressure gas oxygen of the liquid oxygen storage tank can be realized, and the safety of the liquid oxygen storage tank is effectively ensured so as to ensure the safety of the underwater carrying platform.
4. When the underwater carrying platform is in a large submergence depth, overpressure gas oxygen discharge of the liquid oxygen storage tank can be realized, and the safety of the liquid oxygen storage tank is effectively ensured, so that the safety of the underwater carrying platform is further ensured.
5. By using the pneumatic valve, the oxygen concentration required by personnel during cabin maintenance can be ensured when the underwater carrying platform needs to be maintained at a wharf or a port.
6. The system adopts the sea-opening one-way valve, ensures the single-phase discharge of overpressure gas oxygen, and can prevent the seawater outside from leaking in.
7. The system device adopts the high-pressure pipeline (blue) and the low-pressure pipeline (white) according to the submergence depths of different sizes, thereby not only realizing the overpressure gas oxygen discharge of the underwater carrying platform in the submergence depth, but also effectively avoiding the over-design of the system.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Wherein: 1. a sea-going check valve; 2. a first oxygen scavenger; 3. a first check valve; 4. a first pneumatic valve; 5. a first shut-off valve; 6. a second oxygen scavenger; 7. a third oxygen scavenger; 8. a second pressure sensor; 9. a liquid oxygen storage tank; 10. a molecular sieve oxygen generator; 11. an air compressor; 12. an air filter; 13. a fourth pneumatic valve; 14. an oxygen concentration sensor; 15. a high pressure oxygen buffer tank group; 16. a sixth oxygen scavenger; 17. a fifth oxygen scavenger; 18. a fourth oxygen scavenger; 19. a pressure-resistant sealed cabin; 20. a first safety valve; 21. a second relief valve; 22. a third relief valve; 23. a second stop valve; 24. a third stop valve; 25. a first pressure sensor; 26. a fourth stop valve; 27. a second pneumatic valve; 28. a second one-way valve; 29. a fifth stop valve; 30. a second oxygen press; 31. a third pneumatic valve; 32. a third check valve; 33. a seventh stop valve; 34. a first oxygen press; 35. a sixth pneumatic valve; 36. a fifth pneumatic valve; 37. a high pressure oxygen conduit; 38. a low pressure oxygen conduit; 39. a third pressure sensor; 40. a fourth check valve; 41. and (4) bursting the membrane.
Detailed Description
The following describes embodiments of the present invention with reference to the drawings.
As shown in fig. 1, the oxygen safety system device of the underwater unmanned closed cabin of the embodiment includes a pressure-resistant closed cabin 19, wherein a plurality of groups of deoxidants are arranged on the inner wall surface of the pressure-resistant closed cabin 19, a sea-opening one-way valve 1 is arranged outside the pressure-resistant closed cabin 19, an outlet of the sea-opening one-way valve 1 enters the pressure-resistant closed cabin 19 through a pipeline, the pipeline is connected with a liquid oxygen storage tank 9, and the pipeline is also connected with a first one-way valve 3, a first pneumatic valve 4 and a first stop valve 5 in series;
the pipeline between the sea-going one-way valve 1 and the first one-way valve 3 is connected with the high-pressure oxygen buffer tank group 15 through a high-pressure oxygen pipeline 37, and a sixth pneumatic valve 35 and a second pneumatic valve 27 are installed on the high-pressure oxygen pipeline 37;
the pipeline between the first pneumatic valve 4 and the first stop valve 5 is connected with a molecular sieve oxygen generator 10 through a low-pressure oxygen pipeline 38, the low-pressure oxygen pipeline 38 is also connected with a first oxygen compressor 34, a third one-way valve 32 and a second oxygen compressor 30 in parallel, the first oxygen compressor 34, the third one-way valve 32 and the second oxygen compressor 30 are simultaneously communicated with the high-pressure oxygen pipeline 37 through pipelines, and the second one-way valve 28 is installed on the pipelines;
a fourth check valve 40 and a rupture disk 41 are connected in series between a pipeline between the first check valve 3 and the first pneumatic valve 4 and the low-pressure oxygen pipeline 38;
the output end of the high-pressure oxygen buffer tank group 15 is provided with a first pressure sensor 25;
the input end of the molecular sieve oxygen generator 10 is connected in series with an air compressor 11, an air filter 12 and a fourth pneumatic valve 13 in sequence through pipelines, and the input port of the fourth pneumatic valve 13 is communicated with oxygen inside a pressure-resistant closed chamber 19.
First deoxidant 2, second deoxidant 6 and third deoxidant 7 are arranged on one side of the inner wall surface of the pressure-resistant closed cabin 19 at intervals from top to bottom in sequence, and fourth deoxidant 18, fifth deoxidant 17 and sixth deoxidant 16 are arranged on the other side of the inner wall surface of the pressure-resistant closed cabin 19 at intervals from top to bottom in sequence.
The high-pressure oxygen buffer tank group 15 is divided into three tanks, and a first safety valve 20, a second safety valve 21 and a third safety valve 22 are respectively arranged on pipelines of output ports of each tank.
A fourth stop valve 26, a third stop valve 24 and a second stop valve 23 are respectively connected to the pipelines of the output ports of each of the high-pressure oxygen buffer tank groups 15.
A second pressure sensor 8 is attached to the bottom of the inner wall surface of the pressure-proof sealed chamber 19.
A third pressure sensor 39 is mounted on the low pressure oxygen line 38.
An oxygen concentration sensor 14 is also mounted at the bottom of the inner wall surface of the pressure-resistant sealed chamber 19.
The fifth air-operated valve 36 and the seventh shut-off valve 33 are respectively installed at both ends of the first oxygen compressor 34.
The second oxygen press 30 is mounted with a third air-operated valve 31 and a fifth shutoff valve 29 at both ends thereof, respectively.
The functions of each important part of the invention are as follows:
sea-dredging check valve 1: a valve which can only flow in one direction but can not flow back is used for preventing seawater from flowing back to the inside of a platform.
The first deoxidant 2, the second deoxidant 6, the third deoxidant 7, the sixth deoxidant 16, the fifth deoxidant 17 and the fourth deoxidant 18 have the same structure, are all oxygen absorbing in the cabin through chemical reaction, mainly comprise a main agent, an auxiliary agent and a filling agent, and have the average oxygen removing amount of 50 mL/g.
First check valve 3: a valve which can only flow in one direction but can not flow back prevents oxygen in a high-pressure pipeline from flowing back to a low-pressure pipeline.
First pneumatic valve 4: a gas driven valve is used, the gas medium used in the system device is nitrogen, and when the liquid oxygen storage tank 9 generates overpressure of gas oxygen, the overpressure of gas oxygen can be discharged by opening a first pneumatic valve 4 through remote control.
First stop valve 5: a valve with on-off function is manually operated, one end of the valve is connected with a liquid oxygen storage tank 9, and the other end of the valve is connected with a first pneumatic valve 4.
Second pressure sensor 8: the system is used for detecting the gas pressure of a closed chamber.
Liquid oxygen storage tank 9: a pressure vessel for storing cryogenic liquid oxygen.
Molecular sieve oxygen generator 10: an apparatus for separating oxygen and nitrogen by utilizing the difference in adsorption performance between nitrogen and oxygen in the air due to the difference in pressure on a zeolite molecular sieve, wherein an adsorbent for adsorbing moisture, carbon dioxide and a small amount of other gases and a zeolite molecular sieve for adsorbing nitrogen are filled in the apparatus.
The air compressor 11: an apparatus for pressurizing air to a gas pressure required for operation of a molecular sieve oxygen generator 10.
Air filter 12: an apparatus for filtering dust and solid particles from cabin air.
Fourth pneumatic valve 13: a gas medium used by the system device is nitrogen, when the oxygen concentration in a pressure-resistant closed cabin 19 exceeds the safe oxygen concentration, a fourth pneumatic valve 13 can be opened through remote control to allow high-concentration oxygen in the cabin to enter a molecular sieve oxygen generator 10 for treatment through an air compressor 11.
Oxygen concentration sensor 14: the system is used for detecting the oxygen concentration in a closed chamber.
High-pressure oxygen buffer tank group 15: the device for storing high-pressure oxygen gas is characterized in that when overpressure occurs in the liquid oxygen tank, overpressure gas in the liquid oxygen tank enters the high-pressure oxygen buffer tank group 15 through the oxygen compressor.
Pressure tight enclosure 19-a sealed enclosure capable of withstanding the back pressure of seawater, the interior of which is used to house system equipment.
First, second, and third relief valves 20, 21, and 22: the system device is used for safely discharging high-pressure oxygen in the high-pressure oxygen buffer tank group 15.
Second, third, and fourth cut valves 23, 24, and 26: are manually operated valves with on-off function, and the system is used for opening or closing the high-pressure oxygen buffer tank set 15.
First pressure sensor 25: an instrument for detecting gas pressure is used for detecting the gas pressure of a high-pressure oxygen buffer tank group 15 in the system device.
Second air-operated valve 27: a valve driven by gas is characterized in that a gas medium used in the system device is nitrogen, when a platform arrives at a port or a wharf and personnel need to enter a pressure-resistant closed cabin 19 for equipment maintenance, a second pneumatic valve 27 can be opened through remote control to enable the oxygen concentration in the cabin to be increased to be proper.
Second check valve 28: a valve which can only flow in one direction but can not flow back prevents the oxygen in the high-pressure oxygen buffer tank group 15 from flowing back to the front ends of the second oxygen compressor 30 and the first oxygen compressor 34.
Fifth and seventh stop valves 29 and 33: a manually operated valve with on-off function.
Third check valve 32: a valve which can only flow in one direction but can not flow back is used for controlling the second oxygen compressor 30 and the first oxygen compressor 34, and can also prevent the high-pressure oxygen at the outlet of the second oxygen compressor 30 and the first oxygen compressor 34 from flowing back.
Third and fifth air-operated valves 31, 36: the gas medium used in the system device is nitrogen, and the separated oxygen can pass through the second oxygen press 30 and the first oxygen press 34 or not by opening or closing the third pneumatic valve 31 and the fifth pneumatic valve 36.
Sixth pneumatic valve 35: the valve is driven by gas, the gas medium used in the system device is nitrogen, and whether oxygen in a high-pressure oxygen buffer tank group 15 is discharged into seawater or not is controlled.
High-pressure oxygen line 37: the pipeline is used for conveying high-pressure oxygen with pressure higher than the working depth of a platform.
Low-pressure oxygen line 38: a pipeline for introducing low-pressure oxygen is used for conveying the low-pressure oxygen generated after vacuum failure of a liquid oxygen storage tank 9 in the system device.
Third pressure sensor 39: an apparatus for detecting gas pressure is provided in the system for detecting oxygen pressure in a low pressure oxygen line 38.
Fourth check valve 40: a valve which can only flow in one direction but can not flow back.
Rupture disk 41: an overpressure automatic blasting device, when the pressure of gas oxygen in a liquid oxygen storage tank 9 exceeds a certain pressure, a blasting film 41 is blasted to discharge the gas oxygen.
In the actual use process:
firstly), deoxidizing by using an oxygen scavenger:
when the underwater carrying platform normally works, because the continuous operation of the fuel cell can continuously generate oxygen tail exhaust, a certain amount of first deoxidant 2, second deoxidant 6, third deoxidant 7, fourth deoxidant 18, fifth deoxidant 17 and sixth deoxidant 16 are dispersedly arranged in the pressure-resistant closed cabin 19, oxygen tail exhaust generated by the fuel cell and slightly leaked oxygen of pipelines, valve members and pipeline joints of an oxygen system are continuously absorbed in the whole working process of the platform, and the oxygen concentration in the pressure-resistant closed cabin 19 is always kept below the safe oxygen concentration.
Two) oxygen removal of the molecular sieve oxygen generator 10:
when the oxygen scavenger is saturated or pipeline valves in the cabin are damaged or sealed to lose efficacy, the oxygen concentration in the cabin is rapidly increased, the oxygen concentration in the pressure-resistant closed cabin 19 is detected through the oxygen concentration sensor 14, when the oxygen concentration is increased to exceed the safe oxygen concentration and reaches a certain value, the air compressor 11 is automatically started, the fourth pneumatic valve 13 is opened, air containing high-concentration oxygen in the cabin sequentially passes through the fourth pneumatic valve 13 and the air filter 12 to filter dust and solid particles and then enters the air compressor 11 to be compressed, when the air is compressed to a certain pressure, the air enters the molecular sieve oxygen generator 10 to separate nitrogen and oxygen in the air, and the separated oxygen passes through the third one-way valve 32 and the second one-way valve 28 and then respectively enters the high-pressure oxygen buffer tank set 15 through the first safety valve 20, the second safety valve 21 and the third safety valve 22.
Thirdly), discharging the gas and oxygen with large underwater submergence depth and overpressure:
when the seawater back pressure of the underwater carrying platform exceeds the pressure resistance of the liquid oxygen storage tank 9 and the connected pipeline, namely, when the underwater carrying platform is at a certain depth, if the liquid oxygen storage tank 9 fails to be vacuumized, the liquid oxygen in the liquid oxygen storage tank 9 is rapidly vaporized, the pressure of the gas oxygen in the liquid oxygen storage tank is rapidly increased, the design pressure of the liquid oxygen storage tank 9 is limited to be lower than the seawater back pressure, and the liquid oxygen cannot be directly discharged outwards, therefore, after the overpressure gas oxygen in the liquid oxygen storage tank 9 enters the first oxygen compressor 34 or the second oxygen compressor 30 for pressurization (one use and one spare use), the overpressure gas oxygen passes through the fifth stop valve 29 or the seventh stop valve 33 and the second one-way valve 28, passes through the first safety valve 20, the second safety valve 21 and the third safety valve 22, and is charged into the high-pressure oxygen buffer tank group 15, when the pressure of the oxygen in the high-pressure oxygen buffer tank group 15 is higher than the seawater back pressure, the sixth pneumatic valve 35 is opened, and the high-pressure oxygen in the high-pressure oxygen buffer tank group 15 is discharged to the outside of the platform through the sixth pneumatic valve 35 and the sea-going check valve 1.
Fourthly) active and passive overpressure gas-oxygen discharge under water with small submergence depth:
when the seawater back pressure of the underwater carrying platform is smaller than the pressure resistance of the liquid oxygen storage tank 9 and the connected pipelines, namely, when the seawater carrying platform is at a certain depth and is shallow, if the liquid oxygen storage tank 9 is vacuum-failure at the moment, the liquid oxygen in the liquid oxygen storage tank 9 is rapidly vaporized to cause the pressure of the gas oxygen in the liquid oxygen storage tank to be rapidly increased, at the moment, the design pressure of the liquid oxygen storage tank 9 is larger than the seawater back pressure and can be directly and actively discharged outwards, at the moment, the overpressure gas oxygen in the liquid oxygen storage tank 9 passes through the first stop valve 5, the first pneumatic valve 4 and the first one-way valve 3 are opened, the overpressure gas oxygen passes through the first stop valve 5, the first pneumatic valve 4 and the first one-way valve 3, and then passes through the sea one-way valve 1, and the high-pressure. The high-pressure oxygen inside can also be passively exhausted to the outside of the platform through the first check valve 3 and the sea-going check valve 1 through the rupture disk 41 and the fourth check valve 40.
Fifthly), maintaining the oxygen concentration required by personnel during cabin maintenance:
the carrying platform is under water when normal work, because this cabin is unmanned cabin, consequently, keep low cabin oxygen concentration can prevent that the cabin from taking place conflagration or explosion, the security has improved greatly, but when carrying platform need overhaul at pier or harbour under water, if keep too low oxygen concentration, can endanger maintainer's safety, consequently, when overhauing, open second pneumatic valve 27 earlier, the oxygen of high-pressure oxygen buffer tank group 15 passes through first relief valve 20 respectively, behind second relief valve 21 and the third relief valve 22, get into the cabin through second pneumatic valve 27, make the inboard oxygen concentration rise to the oxygen concentration that personnel are fit for overhauing.
The system device is flexible and convenient to use integrally and high in safety factor.
The invention can ensure that the cabin pressure of the underwater carrying platform is in a normal range, prevent equipment in the cabin from being damaged due to overhigh cabin pressure, and ensure that the underwater carrying platform can discharge overpressure gas oxygen of the liquid oxygen tank at the working depth without floating to the water surface when the liquid oxygen tank in the cabin generates overpressure, thereby ensuring the safety of the underwater carrying platform.
The above description is intended to be illustrative and not restrictive, and the scope of the invention is defined by the appended claims, which may be modified in any manner within the scope of the invention.
Claims (9)
1. An oxygen safety system for an underwater unmanned enclosed cabin, comprising: the device comprises a pressure-resistant closed cabin (19), wherein multiple groups of deoxidants are arranged on the inner wall surface of the pressure-resistant closed cabin (19), a sea-opening one-way valve (1) is arranged outside the pressure-resistant closed cabin (19), an outlet of the sea-opening one-way valve (1) enters the pressure-resistant closed cabin (19) through a pipeline, the pipeline is connected with a liquid oxygen storage tank (9), and a first one-way valve (3), a first pneumatic valve (4) and a first stop valve (5) are connected in series on the pipeline; a pipeline between the sea-going one-way valve (1) and the first one-way valve (3) is connected with a high-pressure oxygen buffer tank set (15) through a high-pressure oxygen pipeline (37), and a sixth pneumatic valve (35) and a second pneumatic valve (27) are installed on the high-pressure oxygen pipeline (37);
a pipeline between the first pneumatic valve (4) and the first stop valve (5) is connected with a molecular sieve oxygen generator (10) through a low-pressure oxygen pipeline (38), the low-pressure oxygen pipeline (38) is also connected with a first oxygen compressor (34), a third one-way valve (32) and a second oxygen compressor (30) in parallel, the first oxygen compressor (34), the third one-way valve (32) and the second oxygen compressor (30) are simultaneously communicated with a high-pressure oxygen pipeline (37) through pipelines, and the second one-way valve (28) is installed on the pipelines;
a fourth one-way valve (40) and a rupture disk (41) are connected in series between a pipeline between the first one-way valve (3) and the first pneumatic valve (4) and the low-pressure oxygen pipeline (38);
the output end of the high-pressure oxygen buffer tank group (15) is provided with a first pressure sensor (25);
the input end of the molecular sieve oxygen generator (10) is sequentially connected with an air compressor (11), an air filter (12) and a fourth pneumatic valve (13) in series through pipelines, and the input port of the fourth pneumatic valve (13) is communicated with oxygen inside a pressure-resistant sealed cabin (19).
2. The oxygen safety system for an unmanned underwater closed vessel as claimed in claim 1, wherein: a first deoxidant (2), a second deoxidant (6) and a third deoxidant (7) are sequentially arranged on one side of the inner wall surface of the pressure-resistant closed cabin (19) from top to bottom at intervals, and a fourth deoxidant (18), a fifth deoxidant (17) and a sixth deoxidant (16) are sequentially arranged on the other side of the inner wall surface of the pressure-resistant closed cabin (19) from top to bottom at intervals.
3. The oxygen safety system for an unmanned underwater closed vessel as claimed in claim 1, wherein: the high-pressure oxygen buffer tank group (15) is divided into three tanks, and a first safety valve (20), a second safety valve (21) and a third safety valve (22) are respectively installed on a pipeline of an output port of each tank.
4. The oxygen safety system for an unmanned underwater closed vessel as claimed in claim 1, wherein: and a pipeline of an output port of each tank of the high-pressure oxygen buffer tank group (15) is connected with a fourth stop valve (26), a third stop valve (24) and a second stop valve (23) respectively.
5. The oxygen safety system for an unmanned underwater closed vessel as claimed in claim 1, wherein: and a second pressure sensor (8) is arranged at the bottom of the inner wall surface of the pressure-resistant sealed cabin (19).
6. The oxygen safety system for an unmanned underwater closed vessel as claimed in claim 1, wherein: and a third pressure sensor (39) is arranged on the low-pressure oxygen pipeline (38).
7. The oxygen safety system for an unmanned underwater closed vessel as claimed in claim 1, wherein: an oxygen concentration sensor (14) is also arranged at the bottom of the inner wall surface of the pressure-resistant sealed cabin (19).
8. The oxygen safety system for an unmanned underwater closed vessel as claimed in claim 1, wherein: and a fifth pneumatic valve (36) and a seventh stop valve (33) are respectively arranged at two ends of the first oxygen compressor (34).
9. The oxygen safety system for an unmanned underwater closed vessel as claimed in claim 1, wherein: and a third air-operated valve (31) and a fifth stop valve (29) are respectively arranged at two ends of the second oxygen compressor (30).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010170879.XA CN111346322B (en) | 2020-03-12 | 2020-03-12 | Oxygen safety system of unmanned airtight cabin under water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010170879.XA CN111346322B (en) | 2020-03-12 | 2020-03-12 | Oxygen safety system of unmanned airtight cabin under water |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111346322A CN111346322A (en) | 2020-06-30 |
| CN111346322B true CN111346322B (en) | 2021-03-09 |
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| CN113161589B (en) * | 2021-04-01 | 2022-08-16 | 武汉理工大学 | Tail hydrogen treatment device of proton exchange membrane fuel cell |
| CN113036192B (en) * | 2021-04-01 | 2022-05-17 | 武汉理工大学 | Tail gas treatment system for hydrogen-oxygen fuel cell |
| CN113851685B (en) * | 2021-11-30 | 2022-02-18 | 武汉氢能与燃料电池产业技术研究院有限公司 | Hydrogen leakage prevention device for marine fuel cell system |
| CN114944503A (en) * | 2022-06-02 | 2022-08-26 | 武汉氢能与燃料电池产业技术研究院有限公司 | Oxygen side tail gas treatment system and method for closed space hydrogen-oxygen fuel cell |
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