KR20210110911A - A vent mast - Google Patents

Abstract

The present invention provides a vent mast, comprising: a natural exhaust pipe that is connected to a vent line extending from a fuel tank in a hull, can be opened and closed, and discharges the boil-off gas flowing in through the vent line to the outside; a forced exhaust pipe that is branched from the natural exhaust pipe and is provided so as to be able to open and close, and to forcibly exhaust the residual boil-off gas remaining inside the vent line to the outside; a gas detection unit for detecting residual boil-off gas remaining inside the vent line; and a control unit that selectively opens and closes the natural exhaust pipe or the forced exhaust pipe in accordance with the detection signal of the gas detection unit. An object of the present invention is to provide a vent mast, specifically, a vent mast capable of promoting safety in a ship by detecting and forcibly discharging BOG that cannot be discharged to the outside and remains inside the vent line.

Description

Vent Mast {A VENT MAST}

The present invention relates to a vent mast, and more particularly, to a vent mast installed in a ship.

In general, a ship is a means of transport that carries a large amount of minerals, crude oil, natural gas, or thousands of container boxes and sails the ocean. move through

Such ships generate thrust by driving an engine by receiving fuel from a fuel tank. Recently, as environmental problems arise, ships using liquefied gas such as LNG are widely used as fuel.

At this time, in the case of a fuel tank or a storage tank in which liquefied gas is stored in a ship, BOG (Boiled Off Gas) is continuously generated for various reasons such as sloshing of the liquefied gas and incomplete insulation. Since the internal pressure increases, when a certain pressure (eg, 0.3 bar) is exceeded, the safety valve operates for safety, and some of the boil-off gas in the fuel tank is discharged to the outside through the vent mast.

On the other hand, in the case of a container ship using liquefied gas as a fuel, the residence where the crew lives can be arranged in the central part of the hull to secure the visibility of the control room, and for efficient space utilization, the residence area where it is difficult to load the container box A fuel tank may be disposed in the lower space.

In addition, in the container ship, the vent mast may be disposed in an engine casing provided in the upper part of the engine room in the hull, and the fuel tank may be disposed at the lower part of the housing, so that a vent line may be connected between the vent mast and the fuel tank.

At this time, in a typical container ship, since the vent mast is disposed on the engine casing side of the stern side away from the fuel tank in the center of the hull, the distance between the fuel tank and the engine casing on the hull is long and the vent line is also lengthened.

However, since the fuel tank applied to the container ship is not a pressure vessel unlike other ship types, the safety valve operates even at a relatively weak pressure such as 0.3 to 0.7 bar to discharge BOG. Since there is not enough pressure to sufficiently discharge the gas to the outside, there is a possibility that explosive boil-off gas remains inside the vent line, which causes a problem in the safety of the ship.

Registered Patent No. 10-1532035 (Registration date: June 22, 2015) "Integrated vent mast structure"

An object of the present invention is to provide a vent mast, specifically, a vent mast capable of promoting safety in a ship by detecting and forcibly discharging boil-off gas remaining inside the vent line without being discharged to the outside.

The technical problems to be achieved in the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those of ordinary skill in the art to which the present invention belongs from the following description. will be able

In order to solve the above problems, the present invention provides a natural exhaust pipe connected to a vent line extending from a fuel tank in the hull, provided to be opened and closed, and discharging boil-off gas flowing in through the vent line to the outside, a natural exhaust pipe branched from the vent line, which is provided so as to be able to open and close, a forced exhaust pipe for forcibly exhausting residual BOG remaining inside the vent line, a gas detection unit detecting residual BOG remaining inside the vent line, and a detection signal of the gas detection unit Accordingly, there is provided a vent mast including a control unit for selectively opening and closing a natural exhaust pipe or a forced exhaust pipe.

In addition, by heating a portion of the vent line connected to the natural exhaust pipe to provide a vent mast further comprising a heating member for inducing the flow of residual boil-off gas to the natural exhaust pipe.

In addition, the natural exhaust pipe includes a damper for opening and closing the natural exhaust pipe inside, the forced exhaust pipe is provided at a branch point where the forced exhaust pipe in the natural exhaust pipe branches to open and close an on/off valve for opening and closing the forced exhaust pipe, and the forced exhaust pipe is provided inside the residual boil-off gas It provides a vent mast including an exhaust fan for forcibly sucking in and discharging to the outside.

In addition, when residual BOG is detected by the gas detection unit, the control unit operates the heating member to induce the flow of residual BOG, operates a damper to close the natural exhaust pipe, opens the on/off valve, and operates the exhaust fan at the same time To provide a vent mast for forcibly discharging residual boil-off gas through a forced exhaust pipe.

The vent mast according to an embodiment of the present invention detects boil-off gas remaining inside the vent line without being discharged to the outside as the length of the vent line connecting the fuel tank and the vent mast on the hull becomes longer, By forcibly discharging through the provided forced exhaust pipe, it is possible to promote safety in the ship.

The effects obtainable in the present invention are not limited to the above-mentioned effects, and other effects not mentioned may be clearly understood by those of ordinary skill in the art to which the present invention belongs from the following description. will be.

1 shows a side view of a ship equipped with a vent mast according to an embodiment of the present invention.
FIG. 2 is a front sectional view of the ship shown in FIG. 1 .
Figure 3 shows the arrangement structure of the vent mast and the vent line in the ship according to an embodiment of the present invention.
4 shows the configuration of a vent mast according to an embodiment of the present invention.
5 illustrates an operation process of the vent mast according to an embodiment of the present invention.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

DETAILED DESCRIPTION The detailed description set forth below in conjunction with the appended drawings is intended to describe exemplary embodiments of the present invention and is not intended to represent the only embodiments in which the present invention may be practiced.

In order to clearly explain the present invention in the drawings, parts irrelevant to the description may be omitted, and the same reference numerals may be used for the same or similar components throughout the specification.

In an embodiment of the present invention, expressions such as “or” and “at least one” may indicate one of the words listed together, or a combination of two or more.

1 shows a side view of a ship 1 equipped with a vent mast 100 according to an embodiment of the present invention, and FIG. 2 shows a front sectional view of the ship 1 shown in FIG. , Figure 3 shows the arrangement structure of the vent mast 100 and the vent line 41 in the ship 1 according to an embodiment of the present invention.

Prior to the description, the vent mast 100 according to an embodiment of the present invention is a vent mast 100 applied to the ship 1, and is used as a gas fuel as a representative embodiment, and cargo such as a container box (c). A description will be given of the vent mast 100 that can be easily applied to the gas fuel propulsion container ship 1 for loading.

Here, the gas fuel may be used to encompass all liquefied gas fuels that are generally stored in a liquid state, such as LNG, LPG, ethylene, ammonia, etc. In this embodiment, an example using LNG gas will be described as an example. .

1 to 3 , the ship 1 provided with the vent mast 100 according to the present embodiment has a hull 10 , an engine 20 , a fuel tank 30 , and a fuel supply line 40 . and a vent mast 100 .

The hull 10 forms the exterior of the gas fuel propulsion container ship 1, and is surrounded by an upper deck, a side shell plate and a bottom plate, and a spherical bow is formed in the bow in the front-rear direction, and a propulsion device such as a propeller 22 in the stern. and a steering device such as a rudder may be provided.

A plurality of container boxes (c) may be loaded inside the hull 10, and for this purpose, a plurality of cargo holds 11 may be provided inside the hull 10 in the front-rear direction, and the cells in the cargo hold 11 A guide (not shown) may be provided to guide the loading of the container box (c).

In addition, a bulkhead (not shown) may be provided in the cargo hold 11 , and a plurality of bays constituting the cargo hold 11 may be partitioned through the bulkhead (not shown).

In addition, in the cargo hold 11, each step 12 in the form of a step may be formed in the lower left and right to load the container box (c) as much as possible.

In addition, a hatch coaming 13 may be provided on the upper portion of the cargo hold 11 .

That is, referring to FIG. 2 , a hatch for loading and unloading cargo or a person is formed in the container ship 1 , and also the hatch entrance to prevent the intrusion of waves into the dock of the ship 1 , etc. A hatch coaming 13 which is a bulkhead may be installed around it.

Furthermore, a horizontal plate 14a provided horizontally on the upper side of the side wall of the hatch coaming 13 to support the hatch cover 15, and a vertical plate 14b connected to the lower side of the side end of the horizontal plate 14a to reinforce longitudinal strength ) may be provided with a hatch coaming top plate 14 in the form of "a".

Here, the hatch cover 15 supported by the horizontal plate 14a is provided to cover the hatch from the upper portion of the hatch coaming 13 , and a plurality of container boxes c may be loaded onto the hatch cover 15 .

In the case of the container ship (1), in order to maximize the cargo loading capacity, the space and the machine room where the engine 20, the fuel tank 30 are installed, and the living area 50 where the sailors live, the engine room 21 are installed. A plurality of container boxes (c) can be loaded on the inside and upper deck of the hull 10 except for the back.

The engine 20 may be provided in the engine room 21 adjacent to the stern side in the interior of the hull 10 to provide propulsion power of the ship 1 .

That is, the engine 20 for propulsion of the vessel 1 is accommodated in the engine room 21 , and the engine 20 is mechanically or electrically connected to the propeller 22 to consume gas fuel and use the propeller 22 . can be rotated

In addition, an engine casing 60 may be provided in the upper portion of the engine room 21 , the engine casing 60 having a stack for discharging exhaust generated from the engine 20 to the outside, and an emergency generator or fire extinguishing facility It is also possible to form a space in which the back is provided.

The fuel tank 30 may store liquefied gas fuel such as LNG, and may be spaced apart from the engine 20 at the stern side and disposed at the lower portion of the housing 50 in the central portion of the hull 10 .

At this time, the liquefied gas may be stored in a liquefied state in the fuel tank 30 , and may be supplied to the engine 20 through the fuel supply line 40 to be consumed as a propulsion fuel for operating the container ship 1 . .

To this end, the fuel tank 30 may store the liquefied gas in a cryogenic state, and in order to minimize the natural vaporization of the liquefied gas and the change into the boil-off gas, the fuel tank 30 may employ various insulating structures.

In addition, a dome may be provided on the upper portion of the fuel tank 30 , and a fuel supply line 40 may be connected to the dome.

Such a fuel tank 30 may be disposed directly below the residence 50 and may be surrounded by a cofferdam (not shown).

That is, since the fuel tank 30 is a configuration for accommodating hazardous substances, a cofferdam (not shown) is formed around the fuel tank 30 in order to implement thermal insulation while protecting the housing 50 and the like from the fuel tank 30 . ) may be enclosed.

Here, the upper deck of the central part of the hull 10 may be provided with a residence 50 in which a sailor resides. can

That is, in order to secure a view of the control room in the container ship 1, the residence 50 may be disposed in the central part of the hull 10, and thus it is difficult to load the container box c for efficient space utilization. A fuel tank 30 may be disposed in the lower space of the sphere 50 .

The fuel supply line 40 connects between the engine 20 and the fuel tank 30 arranged to be spaced apart from each other in the hull 10 , so that the fuel stored in the fuel tank 30 can be supplied to the engine 20 . .

Such a fuel supply line 40 protrudes above the hull 10 so as to bypass the cargo hold 11 in the hull 10 on which the container box c is loaded. can be placed.

That is, since the container ship 1 must load the container box c by maximally utilizing the cargo hold 11 and the upper space of the hull 10 in the hull 10, the fuel supply line 40 in the cargo hold 11 If there is not enough space to place a fuel supply line 40 in the cargo hold 11, a pipe passage through a separate structure to prevent and protect collision or interference with the heavy container box (c) By making the , there is a problem in that the loading efficiency decreases and the cost increases.

Accordingly, in order to increase the loading efficiency of the container box (c) in the hull 10, the fuel supply line 40 connected between the engine 20 and the fuel tank 30 is protruded to the upper part of the hull 10. By accommodating and arranging inside the top plate 14 of the hatch coaming 13 installed on the upper part of the hull 10, interference with the container box c in the cargo hold 11 can be prevented, and the loading space can be increased. and can safely protect the fuel supply line 40 from the outside.

Specifically, the fuel supply line 40 extends vertically from the fuel tank 30 to the hatch coaming 13 of the upper part of the hull 10 , and is bent at the extended end along the inner side of the hatch coaming top plate 14 . It extends horizontally and is bent at the extended end to be vertically connected to the engine 20 , so that it can be formed to bypass the cargo hold 11 in the hull 10 .

On the other hand, referring to FIG. 3 , the vent mast 100 is connected to the fuel tank 30 and is branched from the vent line 41 extending toward the engine casing 60 and the hull 10 like the engine casing 60 . It may be disposed vertically on the upper portion of the fuel tank 30, it is possible to discharge the boil-off gas flowing in through the vent line (41) to the outside.

Since the fuel tank 30 in which the liquefied gas is stored continuously generates BOG (Boiled Off Gas) as time passes, and this increases the pressure inside the fuel tank 30, a certain pressure (eg, 0.3 bar) is exceeded, the safety valve (not shown) of the fuel tank 30 operates, and some of the boil-off gas in the fuel tank 30 flows into the vent line 41 and is discharged to the outside through the vent mast 100 . can be

Specifically, the vent mast 100 may be disposed on the side of the engine casing 60 provided in the upper portion of the engine room 21 in the hull 10 , and the fuel tank 30 is disposed at the lower portion of the housing 50 . Accordingly, the vent line 41 may be connected between the vent mast 100 and the fuel tank 30 .

Here, the vent line 41 extends vertically from the fuel tank 30 to the upper part of the hull 10 , is bent at the extended end to extend horizontally to the engine casing 60 , and has a vent mast at the extended end. (100) may be vertically connected in the upward direction.

At this time, the vent line 41 may also be provided along the inner side of the hatch coaming top plate 14 together with the fuel supply line 40. In this case, the hatch coaming of the upper part of the hull 10 from the fuel tank 30 ( 13), it may be bent at the extended end to extend horizontally to the engine casing 60 along the inner side of the hatch coaming top plate 14 .

In addition, the vent line 41 connected to the fuel tank 30 as described above may be provided as a pipe separate from the fuel supply line 40 , or may be formed of the same pipe as the fuel supply line 40 .

When the vent line 41 is made of the same piping as the fuel supply line 40, as shown in FIG. 1, the vent mast 100 is located at the piping portion disposed on the engine casing 60 side in the fuel supply line 40. may be installed to branch.

At this time, when the boil-off gas is discharged due to an increase in the pressure of the fuel tank 30 , the boil-off gas in the fuel tank 30 goes to the vent mast 100 on the engine casing 60 side through the fuel supply line 40 . It may be introduced and discharged to the outside through an exhaust port at the top of the vent mast 100 .

On the other hand, when the vent mast 100 is disposed on the engine casing 60 side of the stern side away from the fuel tank 30 in the center of the hull 10 as in this embodiment, the fuel tank 30 on the hull 10 The distance between the and the engine casing 60 is long and the vent line 41 is also lengthened.

In this case, since the fuel tank 30 applied to the container ship 1 is not a pressure vessel unlike other ship types, a safety valve (not shown) operates even with a relatively weak pressure such as 0.3 to 0.7 bar to reduce boil-off gas. Therefore, when the vent line 41 becomes long, there is a possibility that the boil-off gas remains inside the vent line 41 because there is not enough pressure to sufficiently discharge the boil-off gas to the outside. Safety in the vessel 1 can be promoted by detecting the BOG remaining inside the 41 and configured to forcibly discharge the BOG through the vent mast 100 .

Figure 4 shows the configuration of the vent mast 100 according to an embodiment of the present invention.

Referring to FIG. 4 , the vent mast 100 according to an embodiment of the present invention may include a natural exhaust pipe 110 , a forced exhaust pipe 120 , a gas detection unit 130 , and a control unit 140 .

The natural exhaust pipe 110 may be vertically connected to the end of the vent line 41 and vertically disposed along the engine casing 60 , and the boil-off gas introduced from the fuel tank 30 through the vent line 41 . can be discharged outside.

In addition, a damper 111 for opening and closing the natural exhaust pipe 110 may be provided inside the natural exhaust pipe 110 .

The forced exhaust pipe 120 is branched from the natural exhaust pipe 110, and when the natural exhaust pipe 110 is closed by the damper 111, the boil-off gas flowing into the forced exhaust pipe 120 through the vent line 41 is discharged to the outside. can be forcibly expelled.

Specifically, an on-off valve 121 may be provided at a branch point at which the forced exhaust pipe 120 branches from the natural exhaust pipe 110 , and an exhaust fan 122 may be provided inside the forced exhaust pipe 120 .

Accordingly, when the BOG is forcibly discharged through the forced exhaust pipe 120 , the natural exhaust pipe 110 is closed by the damper 111 , and the on/off valve 121 provided at the branch is opened to open the forced exhaust pipe 120 . ), and the exhaust fan 122 rotates to forcibly suck the boil-off gas into the forced exhaust pipe 120 , and at the same time, the sucked boil-off gas can be forcibly discharged to the outside.

The gas detection unit 130 may be provided on the vent line 41 to detect the boil-off gas remaining inside the vent line 41 .

The control unit 140 is connected to the damper 111 , the on/off valve 121 , the exhaust fan 122 , and the gas detection unit 130 , and the damper 111 opens and closes according to the residual BOG detection of the gas detection unit 130 . The valve 121 and the exhaust fan 122 may be controlled.

Specifically, when residual BOG is detected inside the vent line 41 by the gas detection unit 130 , the detection signal of the gas detection unit 130 is transmitted to the control unit 140 , and the control unit 140 naturally The natural exhaust pipe 110 may be closed by operating the damper 111 of the exhaust pipe 110 , the on/off valve 121 of the forced exhaust pipe 120 may be opened, and the exhaust fan 122 may be operated at the same time.

At this time, when the exhaust fan 122 operates, a negative pressure in the pipe is generated, so that the residual boil-off gas in the vent line 41 is sucked into the forced exhaust pipe 120 and at the same time it can be forcibly discharged to the outside.

Meanwhile, the vent mast 100 according to the present embodiment may further include a heating member 150 connected to the control unit 140 and provided in the vent line 41 .

The heating member 150 may be provided at the end of the vent line 41 connected to the natural exhaust pipe 110 , and may be made of a heating coil and wound around the vent line 41 .

When the residual BOG in the vent line 41 is detected by the gas detection unit 130, the heating member 150 heats the end of the vent line 41 to a predetermined temperature under the control of the control unit 140, The residual boil-off gas in the vent line 41 may naturally flow and may be introduced toward the natural exhaust pipe 110 .

At this time, according to the heating by the heating member 150, a natural flow toward the natural exhaust pipe 110 may be generated by an increase in pressure generated by the expansion of the residual boil-off gas in the vent line 41 .

5 illustrates an operation process of the vent mast 100 according to an embodiment of the present invention.

Referring to (a) of FIG. 5 , when BOG flows from the fuel tank 30 to the vent line 41 due to an increase in the pressure of the fuel tank 30 , the BOG flowing into the vent line 41 is naturally It may be discharged to the outside through the exhaust pipe 110 .

At this time, the damper 111 of the natural exhaust pipe 110 may be opened, and the on/off valve 121 provided at the branch point of the natural exhaust pipe 110 and the forced exhaust pipe 120 may maintain a closed state.

In addition, referring to FIG. 5 ( b ), in a state in which the discharge of BOG through the natural exhaust pipe 110 is completed, when the residual BOG is detected inside the vent line 41 by the gas detection unit 130 , In response to the detection signal, the control unit 140 operates the damper 111 of the natural exhaust pipe 110 to close the natural exhaust pipe 110, open the on/off valve 121 of the forced exhaust pipe 120, and simultaneously open the exhaust fan ( 122) can be operated.

Accordingly, when the exhaust fan 122 operates, a negative pressure in the pipe is generated, so that the residual BOG in the vent line 41 can be sucked into the forced exhaust pipe 120 and forcibly discharged to the outside at the same time.

In addition, the control unit 140 operates the heating member 150 provided in the vent line 41 to naturally introduce residual BOG in the vent line 41 toward the natural exhaust pipe 110 , thereby discharging residual BOG. can accelerate

On the other hand, if the residual BOG in the vent line 41 is not detected by the gas detection unit 130 , the control unit 140 stops the operation of the exhaust fan 122 and the forced exhaust pipe 120 through the on/off valve 121 . to open the natural exhaust pipe 110 by operating the damper 111 .

In addition, as in FIG. 5A , even when the BOG is discharged to the outside through the natural exhaust pipe 110 , the BOG in the vent line 41 is discharged through the natural exhaust pipe by using the heating member 150 . Of course, it can be introduced to the (110) side.

As described above, the vent mast 100 according to the embodiment of the present invention is not discharged to the outside as the length of the vent line 41 connecting the fuel tank 30 and the vent mast 100 becomes longer. By detecting the boil-off gas remaining inside the vent line 41 and forcibly discharging it through the forced exhaust pipe 120 provided as an auxiliary, it is possible to promote safety in the ship 1 .

Embodiments of the present invention disclosed in the present specification and drawings are merely provided for specific examples in order to easily explain the technical contents of the present invention and help the understanding of the present invention, and are not intended to limit the scope of the present invention.

Therefore, the scope of the present invention should be construed as including all changes or modifications derived based on the technical spirit of the present invention in addition to the embodiments disclosed herein are included in the scope of the present invention.

1: ship 10: hull
20: engine 30: fuel tank
40: fuel supply line 41: vent line
50: residence 60: engine casing
100: vent mast 110: natural exhaust pipe
111: damper 120: forced exhaust pipe
121: on/off valve 122: exhaust fan
130: gas detection unit 140: control unit
150: heating unit

Claims (4)

a natural exhaust pipe connected to a vent line extending from the fuel tank in the hull, provided to be able to open and close, and for discharging the boil-off gas flowing in through the vent line to the outside;
a forced exhaust pipe branched from the natural exhaust pipe, provided to be openable and openable, and for forcibly discharging residual BOG remaining inside the vent line to the outside;
a gas detection unit detecting the residual BOG remaining inside the vent line; and
and a control unit selectively opening and closing the natural exhaust pipe or the forced exhaust pipe according to a detection signal of the gas detection unit.
The method of claim 1,
The vent mast further comprising a heating member for heating a portion of the vent line connected to the natural exhaust pipe to induce a flow of the residual boil-off gas to the natural exhaust pipe.
The method of claim 2 .
The natural exhaust pipe includes a damper for opening and closing the natural exhaust pipe inside,
The forced exhaust pipe includes an opening/closing valve provided at a branch point where the forced exhaust pipe is branched in the natural exhaust pipe to open and close the forced exhaust pipe, and an exhaust fan provided inside the forced exhaust pipe to forcibly suck in the residual boil-off gas and discharge it to the outside. Included vent mast.
4. The method of claim 3, wherein
The control unit,
When the residual BOG is detected by the gas detection unit, the heating member is operated to induce the residual BOG, the damper is operated to close the natural exhaust pipe, and the on/off valve is opened and the A vent mast for forcibly discharging the residual boil-off gas through the forced exhaust pipe by operating an exhaust fan.

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