JP2001233281A - Exhaust gas blowout device for ship - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an exhaust gas blowout device for a ship capable of increasing propelling efficiency of the ship by a simple and inexpensive means without requiring a special device by effectively using energy of exhaust gas and energy caused by sailing of the ship for reducing frictional resistance of the sailing by forming bubbles by the exhaust gas. SOLUTION: This exhaust gas blowout device for a ship for exhausting exhaust gas exhausted from an exhaust gas source mounted on the ship in the sea through an exhaust gas pipe, is featured by being constituted so as to suck the exhaust gas from an exhaust gas blowout hole by the venturi action by a flow of seawater in a throat-like passage by installing an exhaust engine ejector having the throat-like passage capable of flowing the seawater to the hull periphery including a front part of the hull and the exhaust gas blowout hole opening in the throat-like passage, being connected to an exhaust gas discharge pipe extended from the exhaust gas pipe and blowing out the exhaust gas to the throat-like passage.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust gas attached to a front portion of a hull of a marine vessel in which exhaust gas discharged from an exhaust gas source such as an internal combustion engine mounted on the marine vessel is discharged into the sea through an exhaust gas pipe. The present invention relates to an exhaust gas ejecting apparatus for a ship, wherein the exhaust gas is ejected into the sea by an ejector.

[0002]

2. Description of the Related Art In recent years, exhaust gas discharged from a diesel engine mounted on a ship is discharged from the vicinity of the front of the hull to form bubbles, and the bubbles are wrapped around the hull to reduce frictional resistance during navigation. Techniques for increasing the propulsion efficiency of ships have been provided. One such technique is disclosed in
There is an invention of Japanese Patent Application No. 2-286886. In the present invention, after cooling the exhaust gas from the ship propulsion engine in the cooling device, the compressor is pressurized to a high pressure, mixed with water by the mixer, and injected around the hull from the injection nozzle at the front of the hull. Thus, microbubbles are formed, and the microbubbles cover the entire hull to reduce the frictional resistance during navigation.

[0003]

Exhaust gas is discharged from the vicinity of the front of the hull to form air bubbles, and the air bubbles are wrapped around the hull to reduce the frictional resistance during navigation. It is required that no special equipment is required for the formation, the energy added to the exhaust gas is minimized, the energy of the exhaust gas is used effectively, and the propulsion efficiency of the ship is increased.

However, in the invention of Japanese Patent Application Laid-Open No. 62-286886, in order to promote the action of mixing exhaust gas into seawater, the exhaust gas is cooled by heat exchange with seawater or fresh water in a cooling device. The exhaust gas is pressurized to a high pressure using a compressor. For this reason, in such a conventional technology, it is necessary to install a cooling device as a heat exchanger and a compressor for pressurization in order to promote the action of mixing exhaust gas into seawater, and bubbles are formed by the exhaust gas. A special device is required to supply the energy for the exhaust gas, which makes the device complicated and expensive, and reduces the energy utilization rate of the exhaust gas.

In view of the above-mentioned problems of the prior art, the present invention makes a special use by effectively utilizing the energy of the exhaust gas and the energy involved in the navigation of the ship in order to form bubbles by the exhaust gas and reduce the frictional resistance during navigation. An object of the present invention is to provide a ship exhaust gas ejection device that can increase the propulsion efficiency of a ship by a simple and low-cost means without requiring a device.

[0006]

In order to solve the above-mentioned problems, the present invention provides an invention as set forth in claim 1, wherein exhaust gas discharged from an exhaust gas source such as an internal combustion engine mounted on a ship is discharged into the sea through an exhaust gas pipe. A throat-like passage through which seawater can flow around a hull including a front part of the hull, and a flue gas discharge opening to the throat-like passage and extending from the flue gas pipe, in a ship configured to discharge the hull. An exhaust ejector connected to a pipe and having an exhaust gas ejection hole for ejecting the exhaust gas to the throat-like passage; and an exhaust ejector that sucks the exhaust gas from the exhaust gas ejection hole by a venturi effect due to the flow of seawater in the throat-like passage. The present invention proposes an exhaust gas ejection device for a ship, which is configured as follows.

According to a second aspect of the present invention, there is provided an arrangement of the exhaust ejectors. In the first aspect, a plurality of the exhaust ejectors are arranged in front of the hull at a predetermined interval in a width direction of the hull. It is characterized by being provided.

According to a third aspect of the present invention, there is provided a specific structure of the exhaust ejector. In the first aspect of the present invention, the exhaust ejector has the throat-like passage formed at a center portion and a radius from the throat-like passage. A cylindrical ejector body having a plurality of the exhaust gas ejection holes perforated in a direction, and an exhaust gas passage which supports an outer peripheral surface of the ejector body and guides exhaust gas from the exhaust gas discharge pipe to the exhaust gas ejection hole. And a housing member.

The invention according to claims 4 and 5 relates to a support structure for the exhaust ejector.
The exhaust gas ejector connected to the exhaust ejector is fixed to a hull, and the exhaust ejector is supported by the exhaust gas ejector.

According to a fifth aspect of the present invention, in the fourth aspect, a housing member of the exhaust ejector is fixed to a support projecting from the hull, and the exhaust ejector is connected to both the support and the exhaust gas discharge pipe. It is characterized by being configured to support.

According to this invention, a water flow in the direction toward the hull is formed in the throat-like passage of the exhaust ejector along with the navigation of the ship, and the venturi due to the pressure drop due to the increase in the flow velocity of the seawater in the throat of the throat-like passage is provided. By the action, the exhaust gas is sucked at high speed from the exhaust gas outlet,
An infinite number of minute air bubbles are formed due to a pressure drop accompanying the jet from the exhaust gas outlet to the throat of the throat-like passage. Then, such bubbles flow out into the sea from the throat-like passage, flow in the direction of the hull as the ship sails, cover the entire hull mainly at the front part of the hull, and reduce the frictional resistance of the hull in the sea, Thereby, the propulsion efficiency of the ship can be increased.

Further, according to the third aspect of the present invention, the exhaust ejector allows seawater to flow at a high speed through the throat of a throat-like passage formed in the center of a cylindrical ejector body. Since the exhaust gas is sucked from a plurality of exhaust gas discharge holes radially perforated from the throat-like passage by the venturi effect due to the pressure drop in the throat, the flow in the throat-like passage does not disturb or separate. By increasing the degree of throttling of the throat in the range, it is possible to increase the suction force of the exhaust gas from the exhaust gas outlet and thereby increase the amount of generated bubbles. As a result, a greater reduction in frictional resistance can be obtained.

Therefore, according to the invention, the exhaust gas is discharged through the exhaust gas discharge hole by the venturi effect due to the pressure drop due to the increase in the flow velocity of the seawater in the throat of the throat-like passage in the exhaust ejector as the ship sails. Since it suctions at high speed into the seawater flowing in the passage and forms countless bubbles, the bubbles cover the entire hull and reduce the frictional resistance of the hull in the sea, as in the prior art,
No special power or equipment is required to emit the exhaust gas into the sea. As a result, the vessel is propelled by a simple and inexpensive means that the exhaust gas is sucked into the seawater through the exhaust gas outlet through the throat-like passage at a high speed by the venturi action generated in the throat-like passage of the exhaust ejector. Efficiency can be increased.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to an embodiment shown in the drawings. However, unless otherwise specified, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention thereto, but are merely illustrative examples. It's just

FIG. 1 is a side view showing an arrangement structure of an exhaust gas ejection device for a ship according to an embodiment of the present invention, FIG. 2 is a longitudinal sectional view of an exhaust ejector, and FIG. 3 is a view taken along the line AA of FIG. .

In FIG. 1, which shows an arrangement structure of an exhaust gas ejection device according to the present invention, reference numeral 1 denotes a hull of a ship, 2 denotes a bottom of the hull, and 4 denotes a diesel engine (hereinafter referred to as an engine) installed at a rear portion of the hull 1. Reference numeral 3 denotes an exhaust gas pipe for discharging exhaust gas from the engine 4, reference numeral 5 denotes a supercharger, and reference numerals 6 and 7 denote exhaust gas purifying devices and exhaust gas economizers provided on the exhaust gas pipe 3 downstream of the supercharger 5, respectively. is there. 100 is the sea surface. The exhaust gas pipe 3 extends in the hull 1 from the engine 4 in the bow direction, and penetrates through the bow to protrude into the sea. Then, as shown in FIG.
The outer periphery of the penetrating portion to the bow plate 01 is fixed to the bow plate 01 via seawater sealing means.

2 and 3, reference numeral 10 denotes an exhaust ejector. As shown in FIG. 2, the exhaust ejector 10 has a cylindrical ejector body 20 having a throat portion 21 through which seawater can flow at a central portion thereof, and an outer peripheral surface of the ejector body 20 is fitted and supported. And a housing 22 that performs the operation. As shown in FIG. 2, the throat portion 21 is configured such that the passage areas of the entrance portion and the exit portion are large, and the central throat passage 21 a is narrowed so that a venturi action can be performed. A plurality of (four in this example) exhaust gas discharge holes are formed in the ejector main body 20 in a radial direction from a portion having a minimum passage area of the throat portion 21.

The housing 22 is formed in an annular body in which an annular exhaust gas reservoir 23 communicating with the exhaust gas outlet 14 is formed, and the exhaust gas inlet 13 communicated with the exhaust gas reservoir 23 will be described later. An exhaust gas discharge pipe 12 is connected. Reference numerals 24, 24 denote exhaust gas sealing O-rings provided between the outer peripheral surface of the ejector main body 20 and the inner peripheral surface of the housing 22. As described above, the exhaust gas pipe 3 is fixed to the bow plate 01 at the outer periphery of the penetrating portion to the bow plate 01 via the seawater sealing means and then protrudes into the sea. In the example, three exhaust gas discharge pipes 12 are branched, and the exhaust ejector 10 is fixed to the end of each exhaust gas discharge pipe 12 so as to be supported by the exhaust gas discharge pipe 12 from below. Accordingly, the exhaust gas pipe 3 is connected to the exhaust gas inlet 13 and the exhaust gas reservoir 23 of each of the exhaust ejectors 10 via the exhaust gas discharge pipe 12 branched therefrom.

Reference numeral 11 denotes a support body in which the roots of the four legs 11a are fixed to the bow plate 01. The four legs protrude from the bow plate 01 forward of the hull. By fixing the housing 22 of each exhaust ejector 10 to the support portion 11b connected to the
Is fixedly supported. Therefore, each of the exhaust ejectors 1
Numeral 0 is supported by the hull 1 via the exhaust gas discharge pipes 12 and the exhaust gas pipes 3, and is also supported by the hull 1 by the support 11. Further, the plurality of exhaust ejectors 10 are supported by the respective exhaust gas discharge pipes 12 and the support body 11 as described above, and are provided in front of the hull 1.
3 (one or more) at regular intervals in the width direction
It is juxtaposed. Note that the exhaust ejector 10 may be provided not only in front of the hull 1 but also on the side of the hull 1. In short, it may be provided around the hull including the front part of the hull 1.

During the navigation of a ship equipped with an exhaust gas exhaust device having such a configuration, exhaust gas from the engine 4 enters the exhaust gas pipe 3 via the supercharger 5, passes through the exhaust gas purifier 6 and the exhaust gas economizer 7, The exhaust gas is diverted from the exhaust gas pipe 3 penetrating the plate 01 to the respective exhaust gas discharge pipes 12 to reach the exhaust gas reservoir 23 of the exhaust ejector 10, and as described later,
The gas is ejected from the plurality of exhaust gas ejection holes 14 to the throat portion 21. On the other hand, as shown in FIG. 2, a water flow S is formed in the throat portion 21 of the exhaust ejector 10 in a direction opposite to the navigation of the ship, that is, in a direction toward the hull 1, as the ship sails. As indicated by the arrow 2, the throat 21 flows in the direction of the hull 1. As described above, the throat portion 21 has a large passage area at the entrance portion and the exit portion, and the throat passage 21a at the center is narrowed.
The flow rate of the water flow S increases in the throat passage 21a.

The pressure of the throat passage 21a decreases due to the increase in the flow velocity of the water flow S in the throat passage 21a of the throat portion 21. The exhaust gas is sucked from the exhaust gas outlet 14 by the Venturi action due to the pressure drop, and the exhaust gas is ejected from the exhaust gas outlet 14 to be accelerated. The throat passage 2 through the exhaust gas outlet 14
1a sucks at high speed. As described above, since the exhaust gas has a reduced pressure in the throat passage 21a of the throat portion 21, when the exhaust gas flows out of the exhaust gas discharge hole 14 into the throat passage 21a, the pressure decreases. Innumerable minute bubbles 15 are formed. This bubble 15 flows out of the throat 21 as shown in FIGS.
It flows in the direction of the hull 1 as the ship sails, and covers the entire hull 1 mainly at the front part of the hull 1. By covering the immersed portion of the hull 1 with such bubbles 15, the frictional resistance of the hull 1 in the sea is reduced, and the propulsion efficiency of the ship is increased.

During the navigation, when exhaust gas is ejected toward the hull 1 from an exhaust ejector 10 installed in front of the hull 1, a seawater in front of the hull 1 is formed along the bottom of the hull toward the stern. . Thereby, the propulsion resistance of the ship is reduced. Further, the exhaust ejector 10 allows seawater to flow through the throat passage 21a of the throat portion 21 at a high speed and sucks exhaust gas from the exhaust gas outlet 14 by a Venturi effect due to a pressure drop in the throat passage 21a. By increasing the degree of throttling of the throat passage 21a within a range that does not cause turbulence or separation in the flow in the throat portion 21, the suction force of the exhaust gas from the exhaust gas discharge hole 14 is increased and the air bubbles 15 The amount of generation can be increased. Thereby, reduction of frictional resistance is promoted.

As described above, according to this embodiment, the water flow S in the direction toward the hull 1 is formed in the throat portion 21 of the exhaust ejector 10 as the ship sails, and the throat passage 21a of the throat portion 21 is formed. The exhaust gas is sucked at a high speed from the exhaust gas discharge hole 14 by the Venturi action due to the pressure decrease due to the increase in the velocity of the seawater at the time, and the pressure decrease due to the discharge from the exhaust gas discharge hole 14 to the throat passage 21a of the throat portion 21 An infinite number of minute air bubbles 15 are formed, and the air bubbles 15 flow out of the throat portion 21 into the sea, flow in the direction of the hull 1 as the ship sails, and
The entire hull 1 is covered mainly by the front part. By covering the submerged portion of the hull 1 with such bubbles 15, the frictional resistance of the hull 1 in the sea is reduced, thereby increasing the propulsion efficiency of the marine vessel.

The exhaust ejector 10 is rotatably supported on the support 11 by a remote control via a hinge, and the exhaust gas discharge pipe 12 and the exhaust ejector 1 are supported.
0 may be connected via an expansion joint. With such a configuration, the direction of the exhaust ejector 10 can be adjusted according to the state of the water flow or the like, and the propulsion efficiency can be further increased.

Therefore, according to this embodiment, the exhaust gas is discharged to the exhaust gas discharge port by the Venturi effect due to the pressure drop due to the increase of the flow velocity of the seawater in the throat passage 21a of the throat portion 21 in the exhaust ejector 10 as the ship sails. At high speed, the throat 21 is sucked into the seawater flowing through the throat 14 to form countless bubbles 15, which cover the entire hull 1 and reduce the frictional resistance of the hull 1 in the sea, as in the prior art. Furthermore, no special power or equipment is required to discharge exhaust gas into the sea. Thereby, the exhaust gas is sucked into the seawater at a high speed through the throat portion 21 through the exhaust hole 14 by the venturi action generated in the throat portion 21 of the exhaust ejector 10. Propulsion efficiency can be increased.

[0026]

As described above, according to the present invention, the exhaust gas is discharged by the Venturi effect due to the pressure drop due to the increase in the flow velocity of the seawater in the throat of the throat-like passage in the exhaust ejector as the ship sails. It sucks at high speed into the seawater flowing through the throat passage through the holes to form countless bubbles, which cover the entire hull and reduce the frictional resistance of the hull in the sea, as in the prior art.
No special power or equipment is required to emit the exhaust gas into the sea. As a result, the vessel is propelled by a simple and inexpensive means that the exhaust gas is sucked into the seawater through the exhaust gas outlet through the throat-like passage at a high speed by the venturi action generated in the throat-like passage of the exhaust ejector. The efficiency can be increased, and the energy utilization rate of the exhaust gas can be increased.

[0027] Further, the exhaust ejector is configured specifically as in claim 3, thereby allowing seawater to flow at a high speed through the throat of a throat-like passage formed at the center of the cylindrical ejector body. Since the exhaust gas is sucked from a plurality of exhaust gas discharge holes radially perforated from the throat-like passage by the venturi effect due to the pressure drop in the throat, the flow in the throat-like passage does not disturb or separate. By increasing the degree of throttling of the throat in the range, it is possible to increase the suction force of the exhaust gas from the exhaust gas outlet and thereby increase the amount of generated bubbles. As a result, a greater reduction in frictional resistance can be obtained.

[Brief description of the drawings]

FIG. 1 is a side view showing an arrangement structure of an exhaust gas ejection device for a ship according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of an exhaust ejector.

FIG. 3 is a view as viewed in the direction of arrows AA in FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hull 01 Bow plate 2 Ship bottom 3 Exhaust gas pipe 4 Engine 10 Exhaust ejector 11 Support 12 Exhaust gas exhaust pipe 13 Exhaust gas inlet 14 Exhaust gas exhaust hole 15 Bubbles 20 Ejector main body 21 Throat part 21 21a Throat passage 22 Housing 23 Exhaust gas reservoir S Water flow

Claims (5)

[Claims] Claims 1. In a ship configured to discharge exhaust gas discharged from an exhaust gas source such as an internal combustion engine mounted on the ship into the sea through an exhaust gas pipe, seawater flows around a hull including a front portion of the hull. A throat-shaped passage that is enabled, and an exhaust gas outlet that is opened to the throat-like passage and that is connected to an exhaust gas discharge pipe extending from the exhaust gas pipe and that causes the exhaust gas to be ejected to the throat-like passage. An exhaust gas ejecting apparatus for a ship, wherein an exhaust ejector is attached and exhaust gas is sucked from the exhaust gas ejecting hole by a Venturi effect by a flow of seawater in the throat-like passage. 2. The exhaust gas ejection device for a ship according to claim 1, wherein a plurality of the exhaust ejectors are arranged in front of the hull at a predetermined interval in a width direction of the hull. 3. The exhaust ejector has a throat-shaped passage formed at a central portion thereof, and a plurality of exhaust gas ejection holes formed in a radial direction from the throat-shaped passage. 2. The exhaust gas ejection of a ship according to claim 1, further comprising a housing member that supports an outer peripheral surface of the ejector main body and has an exhaust gas passage formed to guide exhaust gas from the exhaust gas discharge pipe to the exhaust gas ejection hole. apparatus. 4. The exhaust gas ejector connected to the exhaust ejector has a root portion fixed to the hull, and the exhaust gas ejector is supported by the exhaust ejector. Exhaust gas emission equipment for ships. 5. A structure in which a housing member of the exhaust ejector is fixed to a support projecting from the hull, and the exhaust ejector is supported by both the support and the exhaust gas discharge pipe. The exhaust gas ejection device for a ship according to claim 4, characterized in that: