CN111086599A - Gas supply system anticorrosion structure for gas layer drag reduction ship - Google Patents
Gas supply system anticorrosion structure for gas layer drag reduction ship Download PDFInfo
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- CN111086599A CN111086599A CN201911251651.7A CN201911251651A CN111086599A CN 111086599 A CN111086599 A CN 111086599A CN 201911251651 A CN201911251651 A CN 201911251651A CN 111086599 A CN111086599 A CN 111086599A
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- pipeline
- ship
- pressure stabilizing
- stabilizing cavity
- gas
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B1/00—Hydrodynamic or hydrostatic features of hulls or of hydrofoils
- B63B1/32—Other means for varying the inherent hydrodynamic characteristics of hulls
- B63B1/34—Other means for varying the inherent hydrodynamic characteristics of hulls by reducing surface friction
- B63B1/38—Other means for varying the inherent hydrodynamic characteristics of hulls by reducing surface friction using air bubbles or air layers gas filled volumes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B17/00—Vessels parts, details, or accessories, not otherwise provided for
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B1/00—Hydrodynamic or hydrostatic features of hulls or of hydrofoils
- B63B1/32—Other means for varying the inherent hydrodynamic characteristics of hulls
- B63B1/34—Other means for varying the inherent hydrodynamic characteristics of hulls by reducing surface friction
- B63B1/38—Other means for varying the inherent hydrodynamic characteristics of hulls by reducing surface friction using air bubbles or air layers gas filled volumes
- B63B2001/387—Other means for varying the inherent hydrodynamic characteristics of hulls by reducing surface friction using air bubbles or air layers gas filled volumes using means for producing a film of air or air bubbles over at least a significant portion of the hull surface
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T70/00—Maritime or waterways transport
- Y02T70/10—Measures concerning design or construction of watercraft hulls
Abstract
The invention discloses an anti-corrosion structure of a gas supply system for a gas layer drag reduction ship, which comprises a vent pipeline, an opening/closing unit and a pressure stabilizing cavity, wherein the opening of the vent pipeline is connected to a bottom plate of the ship. The opening/closing unit is disposed on the air vent pipe. The pressure stabilizing cavity is arranged between the vent pipeline and the bottom board, the first end of the pressure stabilizing cavity is communicated with the opening of the vent pipeline, and the second end of the pressure stabilizing cavity is fixedly connected with the bottom board. The bottom board of the ship is provided with an air injection part corresponding to the pressure stabilizing cavity and used for injecting air in the pressure stabilizing cavity. The pressure stabilizing cavity and the ventilation pipeline form a gas space in the closed state of the opening/closing unit, and the communication between the gas space and the inside of the ship body is blocked. When the gas supply pipeline does not supply gas, the opening/closing unit is closed, seawater is limited in the gas space and cannot flow to other places, and the seawater is prevented from corroding other places of the ship body.
Description
Technical Field
The invention belongs to the field of ship corrosion prevention, and particularly relates to a gas supply system corrosion prevention structure for a gas layer drag reduction ship.
Background
The air layer drag reduction ship uses an air layer drag reduction technology, and is ventilated to the bottom of the ship through a specially designed device, so that an air layer is formed and maintained at the bottom of the ship, the bottom of the ship is isolated from water, the wet surface area is reduced, the ship resistance can be obviously reduced, and the fuel consumption is reduced.
In the gas layer drag reduction technology, gas generated by a gas source is conveyed to each position of the ship bottom through a pipeline and is sprayed out of the ship bottom through a spray hole. The structures of the vent pipeline, the bottom board and the like near the spray holes are in an oxygen-enriched environment when the gas layer drag reduction system works, and seawater is in a humid environment when the gas layer drag reduction system does not work, so the structure is extremely easy to corrode.
Disclosure of Invention
In order to solve the problems, the invention provides an anti-corrosion structure of a gas supply system for a gas layer drag reduction ship, which is used for improving the anti-corrosion performance of structures such as a vent pipeline, a ship bottom plate and the like near a ship bottom plate spray hole.
The technical scheme of the invention is as follows:
an anticorrosion structure of a gas supply system for a gas layer drag reduction ship comprises a vent pipeline, an opening/closing unit and a pressure stabilizing cavity, wherein the opening of the vent pipeline is connected to a bottom plate of the ship;
the opening/closing unit is arranged on the vent pipeline;
the pressure stabilizing cavity is arranged between the vent pipeline and the bottom plate of the ship, the first end of the pressure stabilizing cavity is communicated with the opening of the vent pipeline, and the second end of the pressure stabilizing cavity is fixedly connected with the bottom plate of the ship;
the bottom board of the ship is provided with an air injection part corresponding to the pressure stabilizing cavity and used for injecting air in the pressure stabilizing cavity;
the pressure stabilizing cavity and the ventilation pipeline form a gas space in the closed state of the opening/closing unit, and the communication between the gas space and the inside of the ship body is blocked.
In one embodiment of the invention, the anti-corrosion plate is further included;
the anti-corrosion plate is arranged between the pressure stabilizing cavity and the bottom plate, a through hole corresponding to the air injection part is formed in the anti-corrosion plate, and the anti-corrosion plate is used for isolating the bottom plate from the air cavity in the pressure stabilizing cavity.
In one embodiment of the invention, the air injection part comprises a nozzle accommodating hole and a nozzle which are arranged on the bottom plate of the ship; the through hole on the anti-corrosion plate corresponds to the nozzle accommodating hole; the first end of the nozzle is fixedly connected with the surface of the corrosion-resistant plate facing the pressure stabilizing cavity, and the second end of the nozzle penetrates through the through hole and is arranged in the nozzle accommodating hole.
In one embodiment of the present invention, the opening/closing unit is a one-way stop valve; the ventilation pipeline comprises a first pipeline and a second pipeline;
one end of the first pipeline is communicated with an air source, and the other end of the first pipeline is communicated with the first end of the one-way stop valve; one end of the second pipeline is communicated with the second end of the one-way stop valve, and the other end of the second pipeline is communicated with the first end of the pressure stabilizing cavity.
In an embodiment of the invention, a sacrificial anode protection block is arranged at the joint of the first pipeline and the one-way stop valve.
In one embodiment of the invention, the sacrificial anode protection block is a zinc block.
In an embodiment of the present invention, a gate valve is disposed on the ventilation pipeline.
In one embodiment of the invention, the corrosion-resistant plate is a stainless steel backing plate, the pressure stabilizing cavity is a stainless steel pressure stabilizing cavity, the nozzle is a stainless steel nozzle, and the second pipeline is a stainless steel pipeline, so that a stainless steel gas space is formed.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages and positive effects:
(1) the pressure stabilizing cavity and the ventilation pipeline form a gas space in the closed state of the opening/closing unit, and the communication between the gas space and the interior of the ship body is blocked. When the gas supply pipeline does not supply gas, the opening/closing unit is closed, seawater is limited in the gas space and cannot flow to other places, and the seawater is prevented from corroding other places of the ship body.
(2) Due to the pressure and economic considerations of the bottom board of the ship, the outer side of the bottom board of the ship can be coated with paint for corrosion prevention, but the inner side of the bottom board in the ventilation pipeline is in a closed environment and cannot be coated with paint. Therefore, the anti-corrosion plate is additionally arranged between the bottom plate of the ship and the vent pipeline to isolate the bottom plate of the ship from the vent pipeline, so that the inner side of the bottom plate of the ship is not contacted with the air cavity in the vent pipeline, the anti-corrosion plate replaces the inner wall surface of the bottom plate of the ship to be contacted with seawater after isolation, and the object corroded by the seawater is replaced by the bottom plate of the ship to be the anti-corrosion plate, thereby achieving the anti-corrosion effect on the inner side of the bottom plate of the ship.
(3) In the embodiment of the invention, the anti-corrosion plate, the pressure stabilizing cavity, the nozzle, the one-way stop valve and the second pipeline can be made of anti-corrosion materials, such as stainless steel, and can generate a good anti-corrosion effect on corrosion of seawater so as to ensure long-term normal operation of the gas supply system.
(4) From the point of view of the pressure born by the first pipeline, the economy and the like, the pipeline material is generally selected from marine steel, and the inside of the pipeline cannot be coated with paint for corrosion prevention. In order to slow down the corrosion, a one-way stop valve is adopted to prevent the reverse flow of the seawater. Meanwhile, a sacrificial anode protection block, such as a zinc block, can be arranged in the second pipeline to slow down the corrosion of the pipeline. The sacrificial anode protection block can lose efficacy after being used for a certain time, and the sacrificial anode protection block can be installed near the one-way stop valve, so that the one-way stop valve can be detached to replace the sacrificial anode protection block when a ship docks.
Drawings
The following detailed description of embodiments of the invention is provided in conjunction with the appended drawings, in which:
FIG. 1 is a schematic view of the gas supply system corrosion prevention structure for a gas layer drag reducing vessel of the present invention;
FIG. 2 is a schematic view of a portion of the gas supply system corrosion prevention structure for a gas layer drag reducing vessel according to the present invention in the length direction of the vessel;
FIG. 3 is a schematic view of a portion of the gas supply system anti-corrosive structure for a gas layer drag reducing vessel according to the present invention in the width direction of the vessel;
FIG. 4 is a partial schematic view of the corrosion prevention plate of the present invention.
Description of reference numerals:
1: a vent line; 2: an anti-corrosion plate; 3: a voltage stabilizing cavity; 4: a nozzle; 5: a one-way stop valve; 6: a gate valve; 7: a zinc block; 8: a bottom board of the ship; 11: a first pipeline; 12: a second pipeline.
Detailed Description
The present invention provides a gas supply system anticorrosion structure for a gas layer drag reduction ship, which is further described in detail with reference to the attached drawings and specific embodiments. Advantages and features of the present invention will become apparent from the following description and from the claims. It is to be noted that the drawings are in a very simplified form and are all used in a non-precise ratio for the purpose of facilitating and distinctly aiding in the description of the embodiments of the invention.
The embodiment of the invention provides an anti-corrosion structure of a gas supply system for a gas layer drag reduction ship, which comprises a vent pipeline, an opening/closing unit and a pressure stabilizing cavity, wherein the opening of the vent pipeline is connected to a bottom plate of the ship. The opening/closing unit is disposed on the air vent pipe. The bottom board of the ship is provided with an air injection part corresponding to the opening of the ventilation pipeline. The pressure stabilizing cavity is arranged between the vent pipeline and the bottom board, the first end of the pressure stabilizing cavity is communicated with the opening of the vent pipeline, and the second end of the pressure stabilizing cavity is fixedly connected with the bottom board.
The pressure stabilizing cavity 3 and the vent pipeline 1 form a gas space in the closed state of the opening/closing unit, and the communication between the gas space and the inside of the ship body is blocked. When the gas supply pipeline does not supply gas, the opening/closing unit is closed, seawater is limited in the gas space and cannot flow to other places, and the seawater is prevented from corroding other places of the ship body.
The bottom board 8 is generally made of a common steel material for economic reasons and the like, and paint can be coated on the outer side of the bottom board 8 for corrosion prevention, but the inner side of the bottom board 8 in the vent pipe 1 is in a closed environment and cannot be coated with paint. Therefore, in the embodiment of the invention, the anti-corrosion plate 2 is additionally arranged between the bottom plate 8 of the ship and the vent pipeline 1, the bottom plate 8 of the ship is isolated from the vent pipeline 1, so that the inner side of the bottom plate 8 of the ship is not contacted with the air cavity in the vent pipeline 1, the anti-corrosion plate replaces the inner wall surface of the bottom plate of the ship to be contacted with seawater after isolation, and the object corroded by the seawater is replaced by the bottom plate of the ship to be the anti-corrosion plate, thereby achieving the anti-corrosion effect on the inner side.
In the embodiment, when the air layer drag reduction system is implemented, the gas is not directly sprayed out through the air passage 1, but the nozzle 4 is arranged at the corresponding position of the bottom plate 8 of the ship, and the gas is sprayed out of the bottom of the ship through the nozzle 4. In order to stabilize the pressure of the ejected gas, a pressure stabilizing cavity 3 is often arranged between the vent pipe and the bottom plate 8 of the ship.
The first end of the pressure stabilizing cavity 3 is communicated with the vent pipeline 1, and the second end of the pressure stabilizing cavity 3 is welded on the corrosion-resistant plate 2 in a sealing mode. The vent pipe 1 is welded with the pressure stabilizing cavity 3 in a sealing way, and the pressure stabilizing cavity 3 is welded with the corrosion-resistant plate 2 in a sealing way. The anticorrosive board 2 sets up on bottom of the ship board 8, and anticorrosive board 2 all around with bottom of the ship board 8 seal welding. In the pressure stabilizing cavity 3, one or more nozzle accommodating holes are formed on the bottom plate 8 of the ship, and through holes are formed in the anti-corrosion plate 2 at positions corresponding to the nozzle accommodating holes. The nozzle 4 passes through the nozzle accommodating hole and the through-hole corresponding to the nozzle accommodating hole. The first end of the nozzle 4 is hermetically welded with the surface of the corrosion-resistant plate 2 facing the pressure stabilizing cavity 3, and the second end of the nozzle 4 is hermetically welded with the outer side of the bottom plate 8 of the ship.
The anti-corrosion plate 2 covers the bottom board 8, so that gas and seawater can not be in direct contact with the inner side of the bottom board 8 when the gas layer drag reduction system works or does not work, and the corrosion place is changed into the anti-corrosion plate 2 from the inner side of the bottom board 8. The anti-corrosion plate 2 is made of anti-corrosion materials, is not easy to resist corrosion, is only arranged at the position of the ship bottom where the pressure stabilizing cavity 3 is arranged, and is low in use cost. The corrosion-resistant plate 2 can be a stainless steel backing plate. And the arrangement of the nozzle 4 can also prevent the opening of the bottom plate 8 from directly contacting with water, and slow down the corrosion of the bottom plate 8.
In the present embodiment, the opening/closing unit is a one-way shutoff valve 5. The ventilation line 1 comprises a first line 11 and a second line 12. One end of the first pipeline 11 is communicated with an air source, and the other end is communicated with the first end of the one-way stop valve 5. One end of the second pipeline 12 is communicated with the second end of the one-way stop valve 5, and the other end is communicated with the pressure stabilizing cavity 3. The one-way stop valve 5 is used for preventing seawater from flowing backward into the vent pipeline 1 in the ship body, reducing the humidity degree and the borne water pressure in the first pipeline 11, keeping the dryness in the first pipeline 11 as much as possible and slowing down the corrosion of the first pipeline 11.
In the present embodiment, the vent line 1 is provided with a gate valve 6, and may be provided on the second line 12. Gate valve 6 is in normally open state, and when meetting the damaged back of vent line 1, emergency closing gate valve 6 prevents that water from flowing backward by vent line 1 and getting into the cabin.
In consideration of corrosion resistance, the second pipeline 12, the pressure stabilizing cavity 3 and the nozzle 4 can be made of materials with good corrosion resistance, such as stainless steel, and can generate a good corrosion resistance effect on the corrosion of seawater so as to ensure the long-term normal operation of the gas supply system.
In view of the pressure borne by the first pipeline 11 and the economy thereof, the pipeline material is generally selected from marine steel, and the inside of the pipeline cannot be coated with paint for corrosion prevention. To slow down the corrosion, a sacrificial anode protection block, for example a zinc block 7, can be arranged in the first pipe line 11. However, the sacrificial anode protection block will fail after being used for a certain time, and the sacrificial anode protection block can be installed at the joint of the first pipeline 11 and the one-way stop valve 5, so that the one-way stop valve 5 can be detached to replace the sacrificial anode protection block when a ship docks.
The outer side of the bottom plating 8 may be coated with an anti-corrosive paint to prevent the bottom plating 8 from directly contacting water.
In the gas lubrication deceleration ship, the vent pipeline 1 and the bottom plate 8 of the ship are positioned in the alternate area of the water and air, and the corrosion of the vent pipeline 1 and the bottom plate of the ship can be accelerated in a humid and oxygen-rich environment, so that the important corrosion prevention is needed. The anticorrosion idea of the embodiment of the invention is to reduce the possibility of direct contact between the anode and the water, and to mount the sacrificial anode protection block to slow down the corrosion speed of the anode and the water.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, it is still within the scope of the present invention if they fall within the scope of the claims of the present invention and their equivalents.
Claims (8)
1. An anticorrosion structure of a gas supply system for a gas layer drag reduction ship is characterized by comprising a vent pipeline, an opening/closing unit and a pressure stabilizing cavity, wherein the opening of the vent pipeline is connected to a ship bottom plate;
the opening/closing unit is arranged on the vent pipeline;
the pressure stabilizing cavity is arranged between the vent pipeline and the bottom plate of the ship, the first end of the pressure stabilizing cavity is communicated with the opening of the vent pipeline, and the second end of the pressure stabilizing cavity is fixedly connected with the bottom plate of the ship;
the bottom board of the ship is provided with an air injection part corresponding to the pressure stabilizing cavity and used for injecting air in the pressure stabilizing cavity;
the pressure stabilizing cavity and the ventilation pipeline form a gas space in the closed state of the opening/closing unit, and the communication between the gas space and the inside of the ship body is blocked.
2. A gas supply system anticorrosion structure for a gas layer drag reducing vessel as recited in claim 1, further comprising an anticorrosion plate;
the anti-corrosion plate is arranged between the pressure stabilizing cavity and the bottom plate, a through hole corresponding to the air injection part is formed in the anti-corrosion plate, and the anti-corrosion plate is used for isolating the bottom plate from the air cavity in the pressure stabilizing cavity.
3. An air supply system anticorrosion structure for a gas layer drag reducing ship according to claim 2, wherein the air injection part comprises a nozzle accommodating hole and a nozzle opened on the bottom plate of the ship; the through hole on the anti-corrosion plate corresponds to the nozzle accommodating hole; the first end of the nozzle is fixedly connected with the surface of the corrosion-resistant plate facing the pressure stabilizing cavity, and the second end of the nozzle penetrates through the through hole and is arranged in the nozzle accommodating hole.
4. An air supply system anticorrosion structure for a gas layer drag reducing ship according to claim 1, wherein the opening/closing unit is a one-way shutoff valve; the ventilation pipeline comprises a first pipeline and a second pipeline;
one end of the first pipeline is communicated with an air source, and the other end of the first pipeline is communicated with the first end of the one-way stop valve; one end of the second pipeline is communicated with the second end of the one-way stop valve, and the other end of the second pipeline is communicated with the first end of the pressure stabilizing cavity.
5. An air supply system anticorrosion structure for a gas layer drag reducing ship as claimed in claim 4, wherein a sacrificial anode protection block is provided at the connection of the first pipeline and the one-way stop valve.
6. An air supply system anticorrosion structure for a gas layer drag reducing vessel as in claim 5 wherein the sacrificial anode protection block is a zinc block.
7. An air supply system anticorrosion structure for a gas layer drag reducing ship according to claim 1, wherein the vent line is provided with a gate valve.
8. An anti-corrosion structure of a gas supply system for a gas layer drag reducing ship as claimed in claim 1, wherein the anti-corrosion plate is a stainless steel backing plate, the pressure stabilizing cavity is a stainless steel pressure stabilizing cavity, the nozzle is a stainless steel nozzle, and the second pipeline is a stainless steel pipeline, forming a gas space made of stainless steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911251651.7A CN111086599A (en) | 2019-12-09 | 2019-12-09 | Gas supply system anticorrosion structure for gas layer drag reduction ship |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911251651.7A CN111086599A (en) | 2019-12-09 | 2019-12-09 | Gas supply system anticorrosion structure for gas layer drag reduction ship |
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| Publication Number | Publication Date |
|---|---|
| CN111086599A true CN111086599A (en) | 2020-05-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911251651.7A Pending CN111086599A (en) | 2019-12-09 | 2019-12-09 | Gas supply system anticorrosion structure for gas layer drag reduction ship |
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| CN (1) | CN111086599A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112793709A (en) * | 2020-12-28 | 2021-05-14 | 中船重工（上海）节能技术发展有限公司 | Air injection structure of air layer resistance reducing device, ship air layer resistance reducing system and air layer resistance reducing ship |
| WO2022178912A1 (en) * | 2021-02-23 | 2022-09-01 | 中船重工（上海）节能技术发展有限公司 | Pressure stabilizing cavity structure applicable to air-layer drag reduction ship |
-
2019
- 2019-12-09 CN CN201911251651.7A patent/CN111086599A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112793709A (en) * | 2020-12-28 | 2021-05-14 | 中船重工（上海）节能技术发展有限公司 | Air injection structure of air layer resistance reducing device, ship air layer resistance reducing system and air layer resistance reducing ship |
| WO2022178912A1 (en) * | 2021-02-23 | 2022-09-01 | 中船重工（上海）节能技术发展有限公司 | Pressure stabilizing cavity structure applicable to air-layer drag reduction ship |
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Address after: 200122 Pudong New Area, Shanghai, China (Shanghai) free trade pilot area 800 Zhang Yang road 21-22 Applicant after: Shanghai Changjiang Shipping Co.,Ltd. Applicant after: CHINA SHIP SCIENTIFIC RESEARCH CENTER SHANGHAI DIVISION Applicant after: China Shipbuilding (Shanghai) Energy Conservation Technology Co.,Ltd. Address before: 200122 Pudong New Area, Shanghai, China (Shanghai) free trade pilot area 800 Zhang Yang road 21-22 Applicant before: Shanghai Changjiang Shipping Co.,Ltd. Applicant before: CHINA SHIP SCIENTIFIC RESEARCH CENTER SHANGHAI DIVISION Applicant before: CSIC (SHANGHAI) ENERGY SAVING TECHNOLOGY DEVELOPMENT CO.,LTD. |