KR102162171B1 - Regasification System and Vessel having the same - Google Patents

Abstract

A gas regasification system and a ship according to an embodiment of the present invention include a liquefied gas storage tank; A boosting pump that pressurizes the liquefied gas stored in the liquefied gas storage tank and supplies it to a customer; And a suction drum temporarily storing liquefied gas supplied from the liquefied gas storage tank to the boosting pump, wherein the boosting pump is disposed in a submerged form in the suction drum.

Description

Gas regasification system and vessel including the same {Regasification System and Vessel having the same}

The present invention relates to a gas regasification system and a ship including the same.

In general, it is known that LNG is a clean fuel and its reserves are also richer than petroleum, and its usage is rapidly increasing as mining and transportation technologies are developed. Such LNG is generally stored in a liquid state by lowering the temperature to -162°C or less under 1 atmosphere of methane, the main component, and the volume of liquefied methane is about 1/600 of the volume of methane in the gaseous state, which is a standard state, and specific gravity Silver is 0.42, which is about one-half of the specific gravity of crude oil.

LNG is liquefied for ease of transport and is vaporized at the place of use after transport. However, due to the risk of natural disasters and terrorism, there is concern about installing LNG vaporization facilities on land.

For this reason, instead of the conventional liquefied natural gas regasification system installed on land, the LNG carrier carrying liquefied natural gas was removed from the propulsion device and a regasification device was installed to provide natural gas vaporized on land. Ships that supply) (for example, LNG FSRU) are in the spotlight.

In the regasification device used in the FSRU, liquefied gas is supplied from the liquefied gas storage tank at low pressure, passed through a suction drum, passed through a boosting pump, passed through a vaporizer, and then supplied with natural gas at high pressure and room temperature.

At this time, in the boosting pump, maintaining the pressure head and removing the dissolved gas become an issue, and a plan to maximize the space utilization of the boosting pump has emerged in order to increase the space utilization in the ship.

The present invention was created to improve the conventional technology, and an object of the present invention is to provide a gas regasification system and a ship including the same, which maximizes space utilization in a ship and improves the driving reliability of liquefied gas regasification. For.

A gas regasification system according to an embodiment of the present invention includes a liquefied gas storage tank; A pump that pressurizes the liquefied gas stored in the liquefied gas storage tank and supplies it to a customer; And a suction drum temporarily storing the liquefied gas supplied to the pump from the liquefied gas storage tank, wherein the pump is disposed in a latent form in the suction drum.

Specifically, a plurality of boosting pumps may be provided to be radially disposed in the suction drum.

Specifically, a feeding pump for supplying the liquefied gas stored in the liquefied gas storage tank to the suction drum; A vaporizer receiving liquefied gas from the boosting pump and vaporizing it; And a regasification line including the feeding pump, the suction drum, the boosting pump, and the vaporizer, wherein the boosting pump is integrated with the suction drum and disposed on the regasification line by the suction drum. Can be.

Specifically, when the devices disposed along one of the regasification lines are referred to as a first train, a plurality of trains may be further included, and one suction drum may be provided in the plurality of trains.

Specifically, a plurality of the boosting pumps may be connected to respective vaporizers provided in the plurality of trains to supply liquefied gas stored in the suction drum to each of the vaporizers.

Specifically, the first to third trains include first to third regasification lines, first to third feeding pumps, first to third carburetors, and the suction drum comprises the first to third One may be provided on the regasification line.

Specifically, the suction drum may have first to third boosting pumps disposed therein, and the first to third boosting pumps may be connected to the first to third vaporizers, respectively.

Specifically, a boil-off gas compressor for pressurizing the boil-off gas generated in the liquefied gas storage tank; And a boil-off gas supply line connecting the boil-off gas compressor and the suction drum, wherein the suction drum mixes boil-off gas supplied through the boil-off gas supply line with the liquefied gas supplied through the regasification line. Can be recondensed.

Specifically, the suction drum may be formed in a shape in which the horizontal direction is longer than the vertical direction.

Specifically, it may be a vessel characterized by having the gas regasification system.

In the gas regasification system according to the present invention and a ship including the same, a plurality of boosting pumps are installed in one suction drum in a latent manner, so that cavitation of the boosting pump is prevented from occurring, thereby improving driving reliability.

In addition, in the gas regasification system according to the present invention and a ship including the same, a plurality of boosting pumps are installed in one suction drum in a latent form, so that the space for building the boosting pump can be omitted, thereby increasing the space utilization within the ship. There is.

In addition, the gas regasification system according to the present invention and the ship including the same, a plurality of boosting pumps installed in a submerged type on one suction drum, and a boosting pump installed outside the suction drum and installed in a latent type As the area is reduced, there is an effect that can minimize the generation of boil-off gas.

1 is a conceptual diagram of a ship equipped with a gas regasification system according to an embodiment of the present invention.
2 is a conceptual diagram of a gas regasification system according to an embodiment of the present invention.
3 is a detailed view of a boosting pump of a gas regasification system according to an embodiment of the present invention.
4 is a detailed view of a boosting pump in a gas regasification system according to another embodiment of the present invention.
5 is a plan view of a boosting pump in a gas regasification system according to another embodiment of the present invention.

Objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments associated with the accompanying drawings. In adding reference numerals to elements of each drawing in the present specification, it should be noted that, even though they are indicated on different drawings, only the same elements are to have the same number as possible. In addition, in describing the present invention, when it is determined that a detailed description of related known technologies may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

Hereinafter, in the present specification, the liquefied gas may be used as a meaning to encompass all gaseous fuels generally stored in a liquid state, such as LNG or LPG, ethylene, ammonia, etc., and may mean liquefied natural gas (LNG) as an example. , If it is not in a liquid state by heating or pressurization, it can be expressed as a liquefied gas for convenience. This can be applied to boil-off gas as well.

In addition, LNG can be used to mean not only NG (Natural Gas) in a liquid state, but also NG in a supercritical state, for convenience, and evaporation gas means BOG (Boil Off Gas), such as naturally vaporized LNG, and in gaseous state. It can be used in the sense of including the liquefied boil-off gas as well as the boil-off gas of.

Liquefied gas may be referred to regardless of state change, such as a liquid state, a gas state, a liquid and gas mixture state, a supercooled state, and a supercritical state, and it is noted that the boil-off gas is the same. In addition, it is apparent that the present invention is not limited to liquefied gas, and may be a liquefied gas treatment system and/or a boil-off gas treatment system, and the systems of each drawing to be implemented below may be applied to each other.

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

1 is a conceptual diagram of a ship equipped with a gas regasification system according to an embodiment of the present invention, FIG. 4 is a detailed view of a boosting pump in a gas regasification system according to an embodiment of the present invention, and FIG. 5 is an implementation of the present invention. A plan view of a boosting pump in a gas regasification system according to an example.

As shown in Figs. 1 to 5, the ship 1 including a gas regasification system according to an embodiment of the present invention includes a liquefied gas storage tank 10, a gas regasification system 20, and a propulsion engine 30. ) And land demanders (40).

A ship 1 including a gas regasification system 20 according to an embodiment of the present invention has a liquefied gas storage tank 10 and a propulsion engine 30 inside the hull 1a, and the hull 1a It may have a gas regasification system 20 and a fuel treatment device (not shown) on the bed. Here, the gas regasification system 20 is, for example, provided on the upper deck on the fore side, but this is only an example and may be disposed in the center of the bow. In addition, the gas regasification system 20, of course, can be disposed not only on the ship but also on land.

Hereinafter, each configuration of the vessel 1 including the gas regasification system 20 according to an embodiment of the present invention will be described.

The liquefied gas storage tank 10 stores liquefied gas to be supplied to the onshore consumer 40. The liquefied gas storage tank 10 must store the liquefied gas in a liquid state. At this time, the liquefied gas storage tank 10 may have a pressure tank shape.

Here, the liquefied gas storage tank 10 is provided inside the ship 1, and may be formed in front of the engine room (not shown), for example, three or four. In this case, the type of the liquefied gas storage tank 10 is not particularly limited in various forms, such as a membrane-type tank, but not limited thereto, and a stand-alone tank.

In addition, the liquefied gas storage tank 10 may be disposed on land, and may be formed in an underground or ground type.

The gas regasification system 20 includes a feeding pump 21, a suction drum 22, a boosting pump 23, a vaporizer 24 and a boil-off gas compressor 25, and the liquefied gas storage tank 10 The stored liquefied gas is supplied to the suction drum 22 through the feeding pump 21 for temporary storage, and the liquefied gas temporarily stored in the suction drum 22 is pressurized through the boosting pump 23 and supplied to the vaporizer 24. After vaporization in the carburetor (24) to be supplied to the land demand (40).

Prior to describing the individual configurations of the gas regasification system 20 according to the embodiment of the present invention, basic flow paths organically connecting the individual components will be described. Here, the flow path may be a line through which a fluid flows, and is not limited thereto, and any configuration in which a fluid flows is possible.

In an embodiment of the present invention, a regasification line (L1) and a boil-off gas supply line (L2) may be further included. Valves (not shown) capable of adjusting the opening degree may be installed in each line, and the supply amount of boil-off gas or liquefied gas may be controlled according to the adjustment of the opening degree of each valve.

The regasification line (L1) connects the liquefied gas storage tank 10 and the onshore customer 40, and passes through the feeding pump 21, the suction drum 22, the boosting pump 23, and the carburetor 24. And, the liquefied gas stored in the liquefied gas storage tank 10 is regasified so that it is supplied to the onshore consumer 40.

The boil-off gas supply line (L2) connects the liquefied gas storage tank 10 and the suction drum 22, includes an boil-off gas compressor 25, and receives boil-off gas generated from the liquefied gas storage tank 10. Treatment to be supplied to the suction drum 22.

Hereinafter, individual components that are organically formed by the above-described lines L1 and L2 to implement the gas regasification system 20 will be described.

The feeding pump 21 is formed between the liquefied gas storage tank 10 and the suction drum 22 on the regasification line L1, and first pressurizes the liquefied gas stored in the liquefied gas storage tank 10 to perform a suction drum. (22) can be supplied.

At this time, the feeding pump 21 may pressurize the liquefied gas stored in the liquefied gas storage tank 10 to 6 to 8 bar and supply it to the suction drum 22. Here, the feeding pump 21 pressurizes the liquefied gas discharged from the liquefied gas storage tank 10 to slightly increase the pressure and temperature, and the pressurized liquefied gas may still be in a liquid state.

The feeding pump 21 may be formed in a latent form inside the liquefied gas storage tank 10 or may be disposed outside the liquefied gas storage tank 10 in a centrifugal form. When the feeding pump 21 is disposed outside the liquefied gas storage tank 10, the feeding pump 21 may be disposed at a position lower than the level of the liquefied gas stored in the liquefied gas storage tank 10.

The suction drum 22 is disposed between the feeding pump 21 and the vaporizer 24 on the regasification line L1, and is supplied by being first pressurized by the feeding pump 21 in the liquefied gas storage tank 10. Temporarily store liquefied gas.

The suction drum 22 is connected to the liquefied gas storage tank 10 through the regasification line L1 and the boil-off gas supply line L2, and supplies boil-off gas by receiving liquefied gas through the regasification line L1 The boil-off gas may be recondensed by mixing with the boil-off gas supplied through the line L2. That is, the suction drum 22 may have a form of a recondenser.

In this case, the suction drum 22 may be formed in a shape in which the horizontal direction is longer than the vertical direction. Accordingly, in the present invention, the height of the suction drum 22 can be reduced, and the overall height of the gas regasification system 20 disposed on the upper deck can be reduced, so that visibility in the cabin (not shown) is easy and gas Since the arrangement position of the regasification system 20 can be flexibly considered, there is an effect of reducing design cost.

The boosting pump 23 pressurizes the liquefied gas stored in the liquefied gas storage tank 10 and supplies it to the onshore consumer 40, and is disposed between the feeding pump 21 and the vaporizer 24 on the regasification line L1. However, it is disposed in the suction drum 22 in a latent form.

That is, the boosting pump 23 may be integrated with the suction drum 22 and disposed on the regasification line L1 by the suction drum 22.

In this case, the boosting pump 23 may be installed outside the suction drum 22 as well, but also in this case, since it is formed in a latent form, the boosting pump 23 may block generation of cavitation, thereby improving driving reliability.

As described above, in the present invention, by installing a plurality of boosting pumps 23 in a latent form inside one of the suction drums 22, the generation of cavitation of the boosting pump 23 is prevented from occurring, thereby improving driving reliability.

In addition, since the construction space of the boosting pump 23 can be omitted, the space utilization within the ship 1 is increased, and the boosting pump 23 is installed outside the suction drum 22 and installed in a submerged manner. Compared to that, the contact area of the liquefied gas is reduced, thereby minimizing the generation of evaporation gas.

A plurality of boosting pumps 23 may be provided and radially disposed in the suction drum 22. As an example, the boosting pump 23 may be formed of the first to fourth boosting pumps 23a to 23d and disposed in a submerged form in the suction drum 22, and the first and second boosting pumps 23a and 23b are It is a movable pump, and the third to fourth pumps 23c and 23d may be preliminary pumps. Of course, all four boosting pumps could be driven.

The carburetor 24 is disposed between the suction drum 22 on the regasification line L1 and the onshore customer 40, and receives liquefied gas from the boosting pump 23 disposed in the suction drum 22 to evaporate it. I can.

The boil-off gas compressor 25 is disposed between the liquefied gas storage tank 10 and the suction drum 22 on the boil-off gas supply line L2 to pressurize the boil-off gas generated in the liquefied gas storage tank 10 It can be supplied to the suction drum 22.

The gas regasification system 20 includes devices arranged along one regasification line L1, that is, a feeding pump 21, a suction drum 22, a boosting pump 23, and a carburetor 24 in a first train. When said, a plurality of trains may be further included.

As an example, the gas regasification system 20 may have three trains, that is, first to third trains, and devices disposed on each train include first to third feeding pumps and first to third trains. It can be formed with 3 vaporizer (24).

In this case, only one suction drum 22 may be provided in the first to third trains so that the first to third trains are not formed on each of the three trains but pass through all of the suction drums 22.

Since the boosting pump 23 is disposed in the suction drum 22, only one may be disposed on the regasification line L1 (of course, as in the first to fourth boosting pumps 23a to 23d). Multiple can be arranged.)

However, it is not limited thereto, and due to the structure of the gas regasification system 20 formed by the first to third trains, the boosting pump 23 is a group of first to third boosting pumps (mixed with the first to third boosting pumps It is formed in the suction drum 22, and can be disposed on the first to third regasification lines on each train, whereby the first to third boosting pump groups are formed in the first to third Liquefied gas stored in the suction drum 22 by being connected to the vaporizer 24 may be supplied to the first to third vaporizers 24, respectively. In this case, the first to fourth boosting pumps may be formed in the first boosting pump group.

For this reason, the present invention does not need to build a suction drum for each train, so that the space of the ship 1 can be optimized and used, and the weight of the equipment can be reduced, so that the loading capacity of the ship 1 can be improved. In addition, since the supply control of the liquefied gas supplied to each train can be unified, the system is simplified and the driving reliability is improved.

The propulsion engine 30 receives and consumes at least a part of the liquefied gas vaporized by the vaporizer 24 or at least partially receives and consumes the vaporized gas compressed by the vaporized gas compressor 25 to propel the ship 1 It can generate momentum. That is, the propulsion engine 30 requires liquefied gas or boil-off gas, and is driven using this as a raw material.

The propulsion engine 30 is a turbine engine using a liquefied gas having a pressure of 1 to 40 bar, a low pressure gas injection engine (DFDE, XDF, etc.) or a liquefied gas having a pressure of about 200 bar to 400 bar (absolute pressure) in the present invention. It may be a high-pressure gas injection engine (MEGI, etc.) used, and the pressure of the liquefied gas required for each propulsion engine 30 may be different.

The turbine may be a gas turbine, a steam turbine, and a steam turbine using waste heat, but is not limited thereto. The turbine may be used to generate electric power and may be directly connected to the drive shaft S that rotates the propeller P and used to generate the power of the hull 1a.

The high-pressure gas injection engine uses a high-pressure gas of about 300 bar, and may be, for example, a MEGI engine (not shown) as a high-pressure gas injection engine, and may be a heterogeneous fuel engine capable of using different types of fuel.

Heterogeneous fuel engines are usually two-stroke engines driven by diesel cycles. Basically, in such a diesel cycle, air is compressed by a piston, the compressed hot air is ignited by ignition fuel, and the remaining high-pressure gas is injected to cause an explosion.

At this time, the ignition fuel is HFO (Heavy Fuel Oil) or MDO (Marine Diesel Oil), and the ratio of ignition fuel and high pressure gas is about 5:95, and the injection amount of ignition fuel can be adjusted from 5 to 100%. Do. Therefore, the ignition fuel can also be used as the driving fuel of the engine.

That is, when the injection amount of ignition fuel is about 5%, boil-off gas (or heated liquefied gas; about 95%) is mainly used as engine driving fuel, and when the injection amount of ignition fuel is 100%, it is ignited as engine driving fuel. When all of the fuel (oil) is used and the injection amount of the ignition fuel is between 5 and 100%, the ignition fuel (oil) and boil-off gas (or heated liquefied gas) are mixed and used as engine driving fuel.

The low-pressure gas injection engine is a consumer that consumes relatively low-pressure boil-off gas compared to the high-pressure gas injection engine, and a low-pressure boil-off gas of about 5 to 40 bar can be used, for example, a DFDE engine or an XDF. It may be an internal combustion engine that generates driving force by combustion of.

In addition, the low-pressure gas injection engine may be a heterogeneous fuel engine capable of using different types of fuel, so oil as well as liquefied gas can be used as fuel, but boil-off gas or oil is not supplied by mixing boil-off gas and oil. Can be. This is to prevent the two materials having different combustion temperatures from being mixed and supplied, thereby preventing the efficiency from dropping.

The onshore consumer 40 may receive and consume the liquefied gas that has been regasified by the gas regasification system 20, and is not limited to the onshore consumer.

As described above, the gas regasification system 20 and the ship 1 including the same according to the present invention are provided with a plurality of boosting pumps 23 in one suction drum 22 in a submerged manner, so that the cavitation of the boosting pump 23 There is an effect of improving the driving reliability by blocking the occurrence at the source.

In addition, the gas regasification system 20 and the ship 1 including the same according to the present invention, by installing a plurality of boosting pumps 23 in a submerged type in one suction drum 22, the construction of the boosting pump 23 Since the space can be omitted, there is an effect of increasing the space utilization within the ship (1).

In addition, the gas regasification system 20 according to the present invention and the ship 1 including the same, by installing a plurality of boosting pumps 23 in a submerged manner in one suction drum 22, the suction drum 22 Compared to the configuration in which the boosting pump 23 is installed and a latent type is installed, the contact area of the liquefied gas is reduced, thereby minimizing the generation of boil-off gas.

Although the present invention has been described in detail through specific examples, this is for explaining the present invention in detail, and the present invention is not limited thereto, and within the technical scope of the present invention, those of ordinary skill in the art It would be clear that the transformation or improvement is possible.

All simple modifications to changes of the present invention belong to the scope of the present invention, and the specific scope of protection of the present invention will be made clear by the appended claims.

1: ship 1a: hull
10: liquefied gas storage tank 20: gas regasification system
21: feeding pump 22: suction drum
23: boosting pumps 23a to 23d: boosting first to fourth pumps
24: carburetor 30: propulsion engine
40: land demand
L1: regasification line L2: boil-off gas supply line
P: propeller S: drive shaft

Claims (10)

Liquefied gas storage tank;
A boosting pump that pressurizes the liquefied gas stored in the liquefied gas storage tank and supplies it to a customer; And
And a suction drum temporarily storing liquefied gas supplied from the liquefied gas storage tank to the boosting pump,
The boosting pump and the suction drum are provided in a regasification line,
When the devices disposed along the regasification line are referred to as a train, a plurality of trains are further included,
The suction drum,
One is provided in the plurality of trains,
The boosting pump,
It is provided on each of the plurality of trains,
The suction drum,
Provided only one for the plurality of trains, the plurality of trains share the one suction drum,
The gas regasification system, wherein the plurality of boosting pumps provided in each of the plurality of trains are disposed in a submerged manner in the one suction drum. The method of claim 1, wherein the boosting pump,
A gas regasification system, characterized in that it is provided with a plurality of radially disposed in the suction drum. The method of claim 2, wherein in the regasification line,
A feeding pump for supplying the liquefied gas stored in the liquefied gas storage tank to the suction drum; And
A vaporizer for vaporizing the liquefied gas supplied from the boosting pump is provided,
The boosting pump,
The gas regasification system, characterized in that it is integrated with the suction drum and is disposed on the regasification line by the suction drum. delete The method of claim 3, wherein the boosting pump,
A gas regasification system, characterized in that a plurality of each are connected to respective vaporizers provided in the plurality of trains to supply liquefied gas stored in the suction drum to each of the vaporizers. The method of claim 5, wherein the plurality of trains,
It consists of a first to third train,
The first to third trains include first to third regasification lines, first to third feeding pumps, and first to third vaporizers,
The suction drum,
A gas regasification system, characterized in that one is provided on the first to third regasification lines. The method of claim 6, wherein the suction drum,
Arranging the first to third boosting pumps inside,
The first to third boosting pumps,
Gas regasification system, characterized in that connected to each of the first to third vaporizers. The method of claim 3,
A boil-off gas compressor for pressurizing boil-off gas generated in the liquefied gas storage tank; And
Further comprising a boil-off gas supply line connecting the boil-off gas compressor and the suction drum,
The suction drum,
A gas regasification system, characterized in that the boil-off gas supplied through the boil-off gas supply line is mixed with the liquefied gas supplied through the regasification line to recondensate. The method of claim 1, wherein the suction drum,
Gas regasification system, characterized in that the horizontal direction is formed in a longer shape than the vertical direction. A ship comprising the gas regasification system according to any one of claims 1 to 3 and 5 to 9.

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