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CN-115515848-B - Air supply device for a ship, a ship comprising such an air supply device and a method of supplying air to an air lubrication device

CN115515848BCN 115515848 BCN115515848 BCN 115515848BCN-115515848-B

Abstract

An air supply apparatus (100) for a vessel is described. The air supply device comprises a first turbocharger (130) having a first compressor (131) and a first turbine (132), the first turbine (132) being drivable by exhaust gases provided from one or more engines (120). The first compressor (131) is coupled to the first turbine (132) through a transmission (133) configured to vary a speed of the first compressor (131). Furthermore, the air supply device comprises an air lubrication device (140) for reducing the resistance of the ship. The first compressor (131) is connected to the air lubrication device (140) to supply air to the air lubrication device (140).

Inventors

  • Ali Kenanen
  • Jean Francois Tisso

Assignees

  • 涡轮增压系统瑞士有限公司

Dates

Publication Date
20260505
Application Date
20210413
Priority Date
20200414

Claims (14)

  1. 1. An air supply apparatus (100) for a vessel (200), comprising: -a first turbocharger (130) having a first compressor (131) and a first turbine (132), the first turbine (132) being drivable by exhaust gases provided from the one or more engines (120), the first compressor (131) being coupled to the first turbine (132) by a transmission (133) configured to increase or decrease the speed of the first compressor (131) compared to the speed of the first turbine (132), wherein the transmission (133) is arranged between the first compressor (131) and the first turbine (132), and the transmission (133) is configured to adjust the speed of the first compressor (131) independently of the speed of the first turbine (132); -an air lubrication device (140) for reducing the drag of the vessel, wherein the first compressor (131) is connected to the air lubrication device (140) for supplying air to the air lubrication device (140), and A second turbocharger (137) having a second compressor (135) and a second turbine (134), the second turbine (134) being drivable by at least one of exhaust gas provided from the one or more engines (120) and exhaust gas provided from the first turbine (132), the second compressor (135) being coupled to the second turbine (134) by a further transmission (136) configured to vary a speed of the second compressor (135), and the further transmission (136) being configured to adjust the speed of the second compressor (135) independently of the speed of the second turbine (134), and the second compressor (135) being connected with an air lubrication device (140) to supply air to the air lubrication device (140), and A third turbocharger (110) having a third compressor (111) and a third turbine (112), the third turbine (112) being connected to the exhaust gas receiver (122) of the one or more engines (120) by a first exhaust gas conduit (11), the first exhaust gas conduit (11) being connected to a flow controller (160) for controlling the flow of exhaust gas from the exhaust gas receiver (122) to the third turbine (112), Wherein the first turbine (132) is connected to the third turbine (112) by a second exhaust conduit (12), the second exhaust conduit (12) being connected to a bypass valve (170) for controlling the flow of exhaust gas from the third turbine (112) to the first turbine (132).
  2. 2. The gas supply apparatus (100) according to claim 1, wherein the transmission (133) is a mechanical transmission, an electric transmission, a pneumatic transmission or a hydraulic transmission.
  3. 3. The air supply apparatus (100) of claim 1, further comprising a second turbine (134) parallel to the first turbine (132), the first turbine (132) and the second turbine (134) being coupled to the first compressor (131) by a transmission (133).
  4. 4. A gas supply apparatus (100) according to any one of claims 1 to 3, wherein the transmission (133) comprises a generator and an electric motor.
  5. 5. The air supply device (100) according to claim 1, wherein the further transmission (136) is a mechanical transmission, an electric transmission, a pneumatic transmission or a hydraulic transmission.
  6. 6. The gas supply apparatus (100) according to claim 1, wherein the flow controller (160) is arranged in a first bypass duct (13) bypassing the third turbine (112).
  7. 7. The air supply apparatus (100) of claim 1, wherein the bypass valve (170) is disposed in a second bypass duct (14) that bypasses the first turbine (132).
  8. 8. The air supply device (100) according to claim 1, the third compressor (111) being connected with an air receiver (121) of the one or more engines (120) by a first air supply duct (16).
  9. 9. The air supply apparatus (100) of claim 8, wherein the first air supply duct (16) includes a charge air cooler (150).
  10. 10. A gas supply apparatus (100) according to any one of claims 1 to 3, wherein the first turbocharger (130) is a secondary turbo-compressor pair provided in addition to a turbocharger for supercharging the one or more engines (120).
  11. 11. A vessel (200) comprising a gas supply arrangement (100) according to any one of claims 1 to 10.
  12. 12. A method (300) of supplying air to an air lubrication device (140) of a vessel, the method comprising: -driving (310) a first turbocharger (130) by using exhaust gas from one or more engines (120); -changing (320) the speed of a first compressor (131) of a first turbocharger (130) by using a transmission (133) coupled to the first turbine (132) and to the first compressor (131) of the first turbocharger (130), wherein the transmission (133) is configured for increasing or decreasing the speed of the first compressor (131) compared to the speed of the first turbine (132) and the transmission (133) is arranged between the first compressor (131) and the first turbine (132), and Supplying (330) air from a first compressor (131) of a first turbocharger (130) to an air lubrication device (140), Wherein the method further comprises: driving (340) a second turbocharger (137) using at least one of exhaust gas from the one or more engines and exhaust gas from the first turbine (132), the second turbocharger (137) having a second compressor (135), the second compressor (135) being coupled to the second turbine (134) through another transmission (136) configured for changing a speed of the second compressor (135), -Changing (350) the speed of the second compressor (135) by using the further transmission (136), and Supplying (360) air from the second compressor (135) of the second turbocharger (137) to the air lubrication device (140), Wherein the method further comprises controlling (335) the amount of air supplied to the air lubrication device (140) by controlling the rotational speed of the first turbocharger (130), wherein the rotational speed of the first turbocharger (130) is controlled by controlling the flow of exhaust gas supplied to a third turbine (112) of a third turbocharger (110) using a flow controller (160), the third turbine (112) being connected with the exhaust gas receiver (122) of the one or more engines (120), Wherein the method further comprises controlling (335) the amount of air supplied to the air lubrication device (140) by controlling the rotational speed of the first turbocharger (130), wherein the rotational speed of the first turbocharger (130) is controlled by controlling the flow of exhaust gas supplied to the first turbine (132) using (337) a bypass valve (170), said bypass valve (170) being arranged in a second bypass conduit (14) bypassing the first turbine (132).
  13. 13. The method (300) of claim 12, wherein varying (320) the speed of the first compressor (131) includes using (321) a second turbine (134) parallel to the first turbine (132), the first turbine (132) and the second turbine (134) being coupled to the first compressor (131) through a transmission (133).
  14. 14. The method (300) of claim 12, wherein the flow controller (160) is disposed in a first bypass duct (13) that bypasses the third turbine (112).

Description

Air supply device for a ship, a ship comprising such an air supply device and a method of supplying air to an air lubrication device Technical Field Embodiments of the present disclosure relate to an air supply apparatus for an air-lubricated ship for reducing water friction resistance. Further, embodiments of the present disclosure relate to a method of supplying air to an air lubrication device of a ship. Background Typically, the submerged surface of the bottom of a ship is subjected to frictional resistance by water during offshore navigation. Especially for large vessels, such as cargo ships, a large part of the hull resistance of the vessel is due to frictional resistance caused by the relative flow of external water at the bottom of the vessel. In order to reduce the frictional resistance of the hull of the vessel, air lubrication may be used, in particular by discharging air around the hull of the vessel to reduce the frictional resistance of the hull of the vessel. The reduction in frictional resistance has a great fuel economy improvement effect and thus represents an effective means of reducing carbon dioxide emissions from ships. In the prior art, there are various systems and methods for generating bubbles for hull lubrication. For example, for the generation of bubbles for hull lubrication, the prior art teaches the use of exhaust gas directly driving the engine or the use of a separate electric compressor or blower. However, the known systems for lubrication of ship hulls have some drawbacks, for example in terms of energy consumption and efficiency. In view of the above, there is therefore a need for an improved air supply device for a vessel and an improved method of supplying air to an air lubrication device of a vessel, which at least partly overcome the problems of the prior art. Disclosure of Invention In view of the above, there is provided a gas supply apparatus for a vessel and a method of supplying air to an air lubrication device of a vessel according to the independent claims. Other aspects, advantages and features are apparent from the dependent claims, the description and the drawings. According to one aspect of the present disclosure, an air supply apparatus for a ship is provided. The air supply device comprises a first turbocharger having a first compressor and a first turbine, the first turbine being drivable by exhaust gases provided by one or more engines. The first compressor is coupled to the first turbine via a transmission configured to change a speed of the first compressor. Furthermore, the air supply device comprises an air lubrication device for reducing the resistance of the ship. The first compressor is connected to the air lubrication device to supply air to the air lubrication device. Accordingly, the air supply apparatus of the present disclosure is improved as compared to conventional apparatuses for air-lubricated vessels. In particular, embodiments of the air supply apparatus described herein are improved in terms of energy efficiency. More specifically, by providing the air supply apparatus with the first turbocharger having the transmission coupling the first turbine with the first compressor to supply air to the air lubrication device, the amount of air supplied to the air lubrication device can be controlled by using the transmission. More specifically, a first turbocharger, in particular a first compressor, is used to compress low pressure air which is then fed to an air lubrication device for generating bubbles under the hull of the ship to reduce the water-hull friction of the ship. Less friction against the hull of the ship results in an overall reduction in the use of ship energy. Thus, for example by using a transmission to increase the speed of the first compressor compared to the speed of the first turbine, the amount of air supplied to the air lubrication device may be increased, resulting in an increase of air bubbles generated under the hull of the ship. Thus, a higher reduction of the water-hull friction of the vessel can be achieved compared to the prior art. Thus, the overall reduction in energy use of the vessel can be reduced, so that fuel can be saved, thereby reducing the overall operating costs. Thus, according to another aspect of the present disclosure, there is provided a vessel comprising an air supply device according to any one of the embodiments described herein. According to another aspect of the present disclosure, a method of supplying air to an air supply of a ship is provided. The method includes driving a first turbocharger using exhaust gas from one or more engines. Further, the method includes varying a speed of a first compressor of the first turbocharger by using a transmission coupled to the first turbine of the first turbocharger and to the first compressor of the first turbocharger. Further, the method includes supplying air from a first compressor of the first turbocharger to the air lubrication device. Accordingl