KR102144180B1 - Regasification System of Gas and Ship having the Same - Google Patents

Abstract

A gas regasification system according to an embodiment of the present invention includes: a liquefied gas supply pump configured to pressurize the liquefied gas discharged from the liquefied gas storage tank and configured in parallel with each other; A vaporizer that vaporizes the liquefied gas pressurized by the liquefied gas supply pump into a heat medium and supplies it to a customer; And an in-line recondenser for mixing boil-off gas and liquefied gas discharged from the liquefied gas storage tank and transferring the mixture to the liquefied gas supply pump, wherein at least one of the liquefied gas supply pump is supplied through the in-line recondenser. It is controlled to receive only the mixed gas, and the rest is controlled to receive only the liquefied gas supplied by bypassing the in-line recondenser from the liquefied gas storage tank.

Description

Regasification System of Gas and Ship having the Same

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

As environmental regulations have recently been strengthened, the use of liquefied natural gas, which is close to eco-friendly fuel, is increasing among various fuels. Liquefied natural gas is generally transported through an LNG carrier, where the liquefied natural gas can be stored in a tank of the LNG carrier in a liquid state by lowering the temperature to -162°C or less under 1 atmosphere. When the liquefied natural gas is in a liquid state, its volume is reduced to one-sixth of that of the gas, so transport efficiency can be increased.

However, the liquefied natural gas is generally consumed in a gaseous state rather than a liquid state, and the liquefied natural gas stored and transported in a liquid state needs to be regasified, so a regasification facility is used.

At this time, the regasification facility is an LNG carrier, FLNG. It can be mounted on ships such as FSRU or provided on land, and the regasification facility implements regasification by heating liquefied natural gas using a heat source such as seawater.

However, since the liquid liquefied natural gas is placed in a cryogenic state close to -160°C, when a large amount of liquefied natural gas is regasified, a large amount of evaporated gas is generated, and there is a big problem in treating such evaporated gas. Due to the need to regasify gas, the space occupied by the regasification facility is very large, but the space inside the ship is very narrow.

Therefore, in recent years, in the process of regasifying the liquefied natural gas stored in the liquid phase, many researches and developments have been made in the direction of stably operating various components and simplifying the regasification facility.

The present invention has been created to improve the prior art, and an object of the present invention is to provide a gas regasification system and a ship having the same for increasing the deployment efficiency and driving reliability of a gas regasification system.

A gas regasification system according to an embodiment of the present invention includes: a liquefied gas supply pump configured to pressurize the liquefied gas discharged from the liquefied gas storage tank and configured in parallel with each other; A vaporizer that vaporizes the liquefied gas pressurized by the liquefied gas supply pump into a heat medium and supplies it to a customer; And an in-line recondenser for mixing boil-off gas and liquefied gas discharged from the liquefied gas storage tank and transferring the mixture to the liquefied gas supply pump, wherein at least one of the liquefied gas supply pump is supplied through the in-line recondenser. It is controlled to receive only the mixed gas, and the rest is controlled to receive only the liquefied gas supplied by bypassing the in-line recondenser from the liquefied gas storage tank.

Specifically, the liquefied gas supply pump may be independently supplied from each of the liquefied gas delivered by bypassing the in-line recondenser and the mixed gas delivered through the in-line recondenser without joining each other.

Specifically, the liquefied gas supply pump is composed of first to third liquefied gas supply pumps, the first liquefied gas supply pump is supplied with only the mixed gas supplied through the in-line recondenser, and the second and second 3 The liquefied gas supply pump may receive only the liquefied gas supplied from the liquefied gas storage tank by bypassing the in-line recondenser.

Specifically, the amount of mixed gas supplied by the first liquefied gas supply pump may be the same as the amount of liquefied gas supplied by each of the second and third liquefied gas supply pumps.

Specifically, the carburetor comprises first to third carburetors and is connected to the first to third liquefied gas supply pumps, respectively, so that the first to third trains together with the first to third liquefied gas supply pumps Can be formed.

Specifically, a boil-off gas supply line connected to the liquefied gas storage tank and the in-line recondenser; First to third liquefied gas supply lines connected from the liquefied gas storage tank to the customer via the first to third liquefied gas supply pumps and the first to third vaporizers; A liquefied gas branch line branched from an upstream of the first to third liquefied gas supply pumps in the first to third liquefied gas supply lines and connected to the in-line recondenser; First to third mixed gas supply lines connected from the in-line recondenser to the first to third liquefied gas supply pumps; First to third mixed gas control valves provided on the first to third mixed gas supply lines, respectively; And first to third liquefied gas control valves respectively provided on the first to third liquefied gas supply lines.

Specifically, the first liquefied gas supply pump is supplied with only the mixed gas supplied through the in-line recondenser, and the second and third liquefied gas supply pumps are supplied from the liquefied gas storage tank by bypassing the in-line recondenser. When only liquefied gas is supplied, the first mixed gas control valve is opened, the second and third mixed gas control valves are closed, the first liquefied gas control valve is closed, and the second and third liquefied gas The control valve can be opened.

Specifically, a low-pressure boil-off gas compressor provided on the boil-off gas supply line may be further included, and the low-pressure boil-off gas compressor may pressurize the boil-off gas stored in the liquefied gas storage tank and supply it to the in-line recondenser.

Specifically, a boil-off gas bypass line connected to the customer by bypassing the vaporizer in the liquefied gas storage tank; And a high-pressure boil-off gas compressor provided on the boil-off gas bypass line.

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

The gas regasification system according to the present invention has an in-line recondenser in place of the suction drum to increase the arrangement efficiency and increase the processing efficiency of the boil-off gas.

In addition, the gas regasification system according to the present invention has an effect of improving the driving reliability of the gas regasification system by preventing pressure loss that may occur due to the construction of the in-line regasification system.

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 a first embodiment of the present invention.
3 is a conceptual diagram of a gas regasification system according to a second embodiment of the present invention.
4 is a conceptual diagram of a gas regasification system according to a third 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 the present specification, in adding reference numerals to elements of each drawing, it should be noted that only the same elements have the same number as possible, even if they are indicated on different drawings. In addition, in describing the present invention, if 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 for example, may mean LNG (Liquefied Natural Gas). , If it is not in a liquid state by heating or pressurization, it can be expressed as a liquefied gas for convenience. Evaporative gas can be applied as well.

Also, for convenience, LNG can be used to encompass not only NG (Natural Gas) in liquid state, but also NG in supercritical state, and evaporation gas means BOG (Boil Off Gas), which is natural vaporized LNG, and gas state. It can be used in a sense to include not only the evaporation gas of the liquefied evaporation gas.

Liquefied gas can be referred to regardless of state changes such as liquid state, gas state, liquid-gas mixture state, supercooled state, supercritical state, and the like, and it is noted that evaporated gas is also the same. In addition, it is obvious 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.

As shown in FIG. 1, a ship 1 equipped with a gas regasification system according to an embodiment of the present invention includes a liquefied gas storage tank 10, a regasification device 20, and a liquefied gas supply device 30. Includes.

A ship (1) equipped with a gas regasification system has a liquefied gas storage tank (10) inside the hull (1a), and a regasification device (20) and a liquefied gas supply device (30) on the hull (1a) Can have

Here, the regasification device 20 accommodates the gas regasification system 2 according to an embodiment of the present invention, and is supposed to be provided on the upper deck on the fore side as an example, but this is only an example and is also arranged in the center of the bow Can be.

In addition, the liquefied gas supply device 30 drives the shaft (S) by processing the liquefied gas stored in the liquefied gas storage tank (10) and supplying it to the propulsion engine (E) to the ship 1 through the propeller (P). It is a device to generate propulsion, and for example, may be provided on the upper deck of the center side of the hull.

In the following, each embodiment of the gas regasification system 2 accommodated in the regasification device 20 will be described in detail based on FIGS. 2 to 4.

2 is a conceptual diagram of a gas regasification system according to a first embodiment of the present invention.

2, the gas regasification system 2 according to the first embodiment of the present invention includes a liquefied gas storage tank 10, a feeding pump 21, an in-line recondenser 22, and an auxiliary pump ( 221), a liquefied gas supply pump 23, a vaporizer 24, a low pressure boil-off gas compressor 25, and a customer 40.

Hereinafter, a gas regasification system 2 according to an embodiment of the present invention will be described with reference to FIG. 2.

Before describing the individual configurations of the gas treatment system 2 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, but is not limited thereto, and any configuration in which a fluid flows is possible.

In an embodiment of the present invention, a liquefied gas supply line (L1), a liquefied gas branch line (L2), a mixed gas supply line (L3), and a boil-off gas supply line (L4) 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 liquefied gas supply line (L1) connects the liquefied gas storage tank 10 and the customer 40, passes through the liquefied gas supply pump 23 and the carburetor 24, and is stored in the liquefied gas storage tank 10. The gas is processed by the liquefied gas supply pump 23 and the vaporizer 24 to be supplied to the customer 40.

The liquefied gas branch line (L2) is branched from the upstream of the liquefied gas supply pump (23) on the liquefied gas supply line (L1) and is connected to the in-line recondenser (22), and the liquefied gas stored in the liquefied gas storage tank (10) At least some of them are supplied to the in-line recondenser 22.

The mixed gas supply line L3 is connected from the in-line recondenser 22 to the liquefied gas supply line L1 or the liquefied gas supply pump 22, and may have an auxiliary pump 221, and the in-line recondenser ( The mixed gas discharged from 22) is supplied to the liquefied gas supply pump 22.

The boil-off gas supply line (L4) connects the liquefied gas storage tank (10) and the in-line recondenser (22), has a low-pressure boil-off gas compressor (25), and the boil-off gas generated from the liquefied gas storage tank (10) May be supplied to the in-line recondenser 22.

Hereinafter, individual components that are organically formed by the respective lines L1 to L4 described above to implement the gas regasification system 2 will be described.

The liquefied gas storage tank 10 stores liquid liquefied gas. The liquefied gas storage tank 10 can store liquefied gas at a pressure of about 1 bar, and the liquefied gas stored in the liquefied gas storage tank 10 is discharged to the outside of the liquefied gas storage tank 10 and then a vaporizer ( It can be vaporized by 24) and delivered to the consumer 40.

Here, the consumer 40 may be an engine or turbine that produces energy, or city gas and general households, but is not particularly limited, and the liquefied gas is delivered to the consumer 40 in a vaporized state by the carburetor 24 I can.

The liquefied gas storage tank 10 may be provided in plural, and may be arranged side by side inside the hull 1a. For example, as shown in FIG. 1, at least four liquefied gas storage tanks 10 may be arranged in a certain direction (front and rear direction) inside the hull 1a, but the number or arrangement of the liquefied gas storage tanks 10 is limited as above. Is not.

The feeding pump 21 discharges the liquefied gas stored in the liquefied gas storage tank 10 to the outside of the liquefied gas storage tank 10. At this time, the liquefied gas may be slightly pressurized by the feeding pump 21. Pressurization by the feeding pump 21 may not be achieved up to the required pressure of the customer 40. Accordingly, the liquefied gas supply pump 23 to be described later pressurizes the liquefied gas by the difference between the pressure of the liquefied gas pressurized by the feeding pump 21 and the pressure required by the customer 40.

The feeding pump 21 may be configured as, for example, a centrifugal pump outside the liquefied gas storage tank 10, or may be formed in a submerged form inside.

A liquefied gas supply line L1 may be provided from the feeding pump 21 to the customer 40, and three liquefied gas supply lines L1 may be formed in parallel to form the first to third trains. .

The in-line recondenser 22 mixes the boil-off gas and liquefied gas discharged from the liquefied gas storage tank 10 and transfers the mixture to the liquefied gas supply pump 23. The in-line recondenser 22, as a replacement for a suction drum (not shown), may implement a function of liquefying the boil-off gas generated in the liquefied gas storage tank 10 into a liquefied gas like the suction drum.

However, the in-line recondenser 22, unlike the suction drum provided on the liquefied gas supply line L1 between the liquefied gas storage tank 10 and the liquefied gas supply pump 23, in the liquefied gas storage tank 10 Instead of being provided in the liquefied gas supply line L1 between the liquefied gas supply pump 23, it may be connected in parallel with the liquefied gas supply line L1.

In this case, the in-line recondenser 22 may be connected through a liquefied gas branch line L2 branched from an upstream of the liquefied gas supply pump 23 in the liquefied gas supply line L1. Accordingly, the in-line recondenser 22 may receive some of the low-pressure liquefied gas supplied from the liquefied gas storage tank 10 to the liquefied gas supply pump 23 through the liquefied gas branch line L2.

At this time, on the liquefied gas branch line (L2), various measurements such as a liquefied gas temperature sensor (not shown) and/or a flow sensor (not shown) for measuring the state of the liquefied gas flowing into the in-line recondenser 22 Means can be provided.

Unlike the liquefied gas supply line L1, the boil-off gas supply line L4 may be directly connected from the liquefied gas storage tank 10 to the in-line recondenser 22. The boil-off gas supply line (L4) delivers the boil-off gas generated in the liquefied gas storage tank (10) to the in-line recondenser (22), in this embodiment, the low-pressure boil-off gas on the boil off gas supply line (L4) A compressor 25 can be provided.

In the case of the suction drum, control to increase the internal pressure is possible, but in the case of the in-line recondenser 22, it is impossible to control the increase in the internal pressure due to the structure. Therefore, in this embodiment, by compressing the boil-off gas supplied from the liquefied gas storage tank 10 to the in-line recondenser 22 with the low-pressure boil-off gas compressor 25, the same function as the pressure control in the suction drum can be guaranteed. I can. At this time, in order to control the operation of the low-pressure boil-off gas compressor 25, etc., various boil-off gas flow sensors (not shown) and/or boil-off gas temperature sensors (not shown) are provided on the boil-off gas supply line (L2). Can be.

The in-line recondenser 22 is discharged from the liquefied gas storage tank 10 and compressed by the low-pressure boil-off gas compressor 25 is discharged from the liquefied gas storage tank 10 to provide a liquefied gas supply pump 23 It may be liquefied by mixing with some of the branched liquefied gas before flowing into the furnace, and a state in which the boil-off gas and the liquefied gas are mixed may be referred to as a mixed gas in the present specification. Since the boil-off gas will be liquefied while being mixed with the liquefied gas, the mixed gas may represent a liquid phase.

The in-line recondenser 22, in order to deliver the mixed gas to the liquefied gas supply line (L1) and/or the liquefied gas supply pump 23, the liquefied gas supply line (L1) and/or from the in-line recondenser 22 A mixed gas supply line L3 connected to the liquefied gas supply pump 23 may be provided.

The auxiliary pump 221 may be provided on the mixed gas supply line L3, and is provided between the in-line recondenser 22 and the liquefied gas supply pump 23 based on the flow of the mixed gas, and stores liquefied gas A pressure difference between the liquefied gas and the mixed gas supplied by bypassing the in-line recondenser 22 from the tank 10 may be compensated.

Compared to the liquefied gas supplied from the liquefied gas storage tank 10 by bypassing the in-line recondenser 22, it is discharged from the liquefied gas storage tank 10 and supplied to the in-line recondenser 22 through the liquefied gas branch line L2. The mixed gas that is mixed with the boil-off gas and then delivered to the liquefied gas supply pump 23 may have a slightly reduced pressure due to the mixture of the boil-off gas.

Accordingly, the auxiliary pump 221 pressurizes the mixed gas to compensate for a pressure difference with the liquefied gas supplied by bypassing the in-line recondenser 22 from the liquefied gas storage tank 10.

In this way, the auxiliary pump 221 is as much as the pressure at which the liquefied gas discharged from the liquefied gas storage tank 10 is dropped by mixing with the boil-off gas while passing through the in-line recondenser 22, in the in-line recondenser 22 The discharged mixed gas can be pressurized and delivered to the liquefied gas supply pump 23. In order to operate the auxiliary pump 221, a mixed gas pressure sensor (not shown) may be provided in the mixed gas supply line L3, and the auxiliary pump 221 may be configured according to the measured value of the mixed gas pressure sensor. Operation can be controlled.

In addition, in the operation of the auxiliary pump 221, the flow rate or temperature of the boil-off gas, the flow rate or temperature of the liquefied gas flowing into the in-line recondenser 22 may be utilized.

In addition, a mixed gas supply valve (not shown) is provided in the mixed gas supply line L3, and the mixed gas supply valve is provided in the liquefied gas branch line L2 in the same/similar manner as the auxiliary pump 221. Operation can be controlled by a gas flow sensor or the like.

Unlike the suction drum, the in-line recondenser 22 of the present embodiment is not configured to store a certain level of liquefied gas, and thus prevents cavitation problems in the liquefied gas supply pump 23 provided downstream of the in-line recondenser 22. It is necessary to provide a means to do so.

To this end, the auxiliary pump 221 and/or the liquefied gas supply pump 23 may be provided with a suction pot (not shown). The suction pot refers to a configuration such as a passage forming a space in which the mixed gas (or liquefied gas) flowing into the auxiliary pump 221 or the liquefied gas supply pump 23 is temporarily stored, and the auxiliary pump 221 and/ Alternatively, the liquefied gas supply pump 23 may be provided in a form submerged in a container in which the mixed gas (or liquefied gas) is stored in a liquid state to suck up only the liquid mixed gas.

Accordingly, in the present embodiment, even if the suction drum is not provided, the gaseous state is prevented from flowing into the auxiliary pump 221 or the liquefied gas supply pump 23, thereby sufficiently protecting the liquefied gas supply pump 23 and the like.

As described above, in this embodiment, while providing the in-line recondenser 22 by replacing the suction drum, both the condensation of the boil-off gas and the protection of the liquefied gas supply pump 23, which are the roles of the suction drum, are guaranteed. At the same time, it is easy to secure a view of the ship through the omission of the high suction drum, and there is an effect of increasing price competitiveness because there is no need to have equipment used to control the suction drum.

The liquefied gas supply pump 23 pressurizes the liquefied gas discharged from the feeding pump 21 or a liquid mixed gas discharged from the in-line recondenser 22.

The liquefied gas pressurized by the liquefied gas supply pump 23 may be higher than the required pressure of the customer 40 and may be configured as a centrifugal pump, and liquefied gas is provided between the liquefied gas supply pump 23 and the customer 40. There may be no additional means of pressurization.

The liquefied gas supply pump 23 may pressurize the liquefied gas supplied from the feeding pump 21 or the mixed gas supplied from the in-line recondenser 22 to 80 to 120 bar and supply it to the vaporizer 24.

The vaporizer 24 vaporizes the liquefied gas. The vaporizer 24 may be provided on the liquefied gas supply line L1, and may heat the liquefied gas using various fruits. For example, in this embodiment, glycol water without a risk of corrosion is used, or Propane, R134a, Co2 or R218, which can utilize latent heat for heat exchange, can be used.

The temperature of the liquefied gas vaporized by the vaporizer 24 may be the required temperature of the customer 40, and may vary depending on the type of the customer 40, so the temperature of the liquefied gas heated in the vaporizer 40 is not particularly limited. Does not. However, as an example, the vaporizer 40 may vaporize the liquefied gas by heating it to 10 to 50 degrees and supply it to the customer 40.

The low-pressure boil-off gas compressor 25 is provided on the boil-off gas supply line L4, and may pressurize the boil-off gas generated in the liquefied gas storage tank 10 and supply it to the in-line recondenser 22.

The consumer 40 may receive and consume the liquefied gas regasified from the gas regasification system 22, and may be, for example, a shore customer, but is not limited thereto.

3 is a conceptual diagram of a gas regasification system according to a second embodiment of the present invention.

As shown in Fig. 3, the gas regasification system 2 according to the second embodiment of the present invention includes a liquefied gas storage tank 10, a feeding pump 21, an in-line recondenser 22, and a liquefied gas supply. It includes a pump 23, a vaporizer 24, a low pressure boil-off gas compressor 25, a heat exchanger 26, a pressure control valve 27, a customer 40, and a high-pressure boil-off gas compressor 50.

Here, in the gas regasification system 2 according to the second embodiment of the present invention, unlike in the gas regasification system 2 according to the first embodiment, the auxiliary pump 221 is omitted, the heat exchanger 26, There is a change in that the pressure control valve 27 and the high pressure boil-off gas compressor 50 are added. Details of this will be described later.

Therefore, in the gas regasification system 2 according to the second embodiment of the present invention, the components other than the heat exchanger 26, the pressure control valve 27, and the high-pressure boil-off gas compressor 50 are used to recover the gas according to the first embodiment. The same reference numerals may be used for the convenience of each configuration in the system 2, but do not necessarily refer to the same configuration.

Hereinafter, the gas treatment system 2 according to the second embodiment of the present invention will be described with reference to FIG. 3, and focus on the heat exchanger 26, the pressure control valve 27, and the high pressure boil-off gas compressor 50. Let's explain it.

In an embodiment of the present invention, it may further include a boil-off gas bypass line (L5).

The boil-off gas bypass line (L5) is provided with a high-pressure boil-off gas compressor (50), which will be described later, and connects the liquefied gas storage tank (10) and the customer (40) to provide boil-off gas compressed by the high-pressure boil-off gas compressor (50). It can be supplied to the customer 40 by bypassing the carburetor 24 without passing through.

The heat exchanger 26 bypasses the in-line recondenser 22 to exchange heat exchange between the liquefied gas delivered to the liquefied gas supply pump 23 and the boil-off gas discharged from the liquefied gas storage tank 10, so that the in-line recondenser 22 ) To reduce the pressure of the liquefied gas delivered to the liquefied gas supply pump (23).

That is, the heat exchanger 26 reduces the pressure of the liquefied gas delivered to the liquefied gas supply pump 23 by bypassing the in-line recondenser 22, thereby reducing the pressure of the mixed gas discharged through the in-line recondenser 22. Correspondingly, it is possible to reduce a pressure difference between the liquefied gas delivered to the liquefied gas supply pump 23 by bypassing the in-line recondenser 22 and the mixed gas discharged through the in-line recondenser 22.

The heat exchanger 26 bypasses the mixed gas discharged through the in-line recondenser 22 and the in-line recondenser 22 generated due to the construction of the in-line recondenser 22, and passes it to the liquefied gas supply pump 23. In the confluence configuration of the liquefied gas, the pressure difference at the confluence portion, which is a problem, can be eliminated, and thus, there is an effect of efficiently using the energy of the feeding pump 21 (pre-cooling of the evaporated gas).

In addition, compared to the construction of the auxiliary pump 221 in the first embodiment described in Fig. 2, it is more efficient in equipment arrangement and availability (operating equipment such as a pump has lower availability compared to static equipment such as a heat exchanger).

At this time, the heat exchanger 26 receives the boil-off gas generated in the liquefied gas storage tank 10 from the boil-off gas supply line L4, heats it with the liquefied gas, and supplies it to the in-line recondenser 22, and supplies the liquefied gas. The liquefied gas stored in the liquefied gas storage tank 10 is supplied from the line L1 and heat-exchanged with the boil-off gas, and then supplied to the liquefied gas supply pump 23. Accordingly, the heat exchanger 26 may be disposed at a position intersecting the boil-off gas supply line L4 upstream of the liquefied gas supply pump 23 on the liquefied gas supply line L1, and the boil-off gas supply line L4 ) May be disposed downstream of the low pressure boil-off gas compressor (25).

In addition, the heat exchanger 26 may be controlled to be precooled by reducing the temperature of the boil-off gas supplied to the in-line recondenser 22. Due to this, the flow rate of the liquefied gas injected into the in-line recondenser 22 can be reduced, and accordingly, the size of the in-line recondenser 22 can be further reduced, resulting in an advantage of requiring less construction space.

The pressure control valve 27 is between the liquefied gas discharged from the heat exchanger 26 and delivered to the liquefied gas supply pump 23 and the mixed gas delivered to the liquefied gas supply pump 23 through the in-line recondenser 22. Compensate for the pressure difference.

That is, the pressure control valve 27 may additionally perform fine pressure control that cannot be performed through the heat exchanger 26.

In an embodiment of the present invention, pressure sensors 271 and 272 may be further included, and the pressure sensors 271 and 272 may be configured with first and second pressure sensors 271 and 272.

The pressure sensors 271 and 272 are between the liquefied gas delivered to the liquefied gas supply pump 23 by bypassing the in-line recondenser 22 and the mixed gas delivered to the liquefied gas supply pump 23 through the in-line recondenser 22. The pressure difference can be measured.

The first pressure sensor 271 is disposed downstream of the pressure control valve 27 on the mixed gas supply line L3, and the second pressure sensor 272 is a heat exchanger 26 on the liquefied gas supply line L1. ) Can be deployed downstream.

The pressure control valve 27 may be driven to compensate for a pressure difference by controlling its operation according to the measured values of the pressure sensors 271 and 272.

As an example, when the pressure value measured by the first pressure sensor 271 is lower than the pressure value measured by the second pressure sensor 272, the pressure control valve 27 reduces the opening degree and reduces the pressure of the mixed gas. When the pressure value measured by the first pressure sensor 271 is higher than the pressure value measured by the second pressure sensor 272, the pressure value measured by the first pressure sensor 271 can be increased and adjusted so that there is no pressure difference with the liquefied gas discharged from the heat exchanger 26, By increasing the opening opening, the pressure of the mixed gas is reduced, so that there is no pressure difference with the liquefied gas discharged from the heat exchanger 26.

The high-pressure boil-off gas compressor 50 is formed on the boil-off gas bypass line L5 and can pressurize the boil-off gas generated in the liquefied gas storage tank 10 and supply it to the customer 40.

At this time, the high-pressure boil-off gas compressor 50 can pressurize the pressure required by the customer 40 at a time, bypassing the liquefied gas supply pump 23 and the carburetor 24 and supplying it to the customer 40 immediately. I can.

As described above, the gas regasification system 2 according to the present invention has an in-line recondenser 22 in place of the suction drum to increase the arrangement efficiency and increase the processing efficiency of the boil-off gas.

In addition, the gas regasification system 2 according to the present invention is effective in improving the driving reliability of the gas regasification system 2 by preventing a pressure loss that may occur due to the construction of the in-line regasification system 22. There is.

4 is a conceptual diagram of a gas regasification system according to a third embodiment of the present invention.

As shown in Fig. 4, the gas regasification system 2 according to the third embodiment of the present invention includes a liquefied gas storage tank 10, a feeding pump 21, an in-line recondenser 22, and a liquefied gas supply. Pump 23, carburetor 24, low-pressure boil-off gas compressor 25, first to third mixed gas control valves 281 to 283, first to third liquefied gas control valves 291 to 293, customer ( 40) and a high-pressure boil-off gas compressor (50).

Here, the gas regasification system 2 according to the third embodiment of the present invention, unlike in the gas regasification system 2 according to the first and second embodiments, the auxiliary pump 221, the heat exchanger 26, and There is a change in that the pressure control valve 27 is omitted, and the first to third mixed gas control valves 281 to 283 and the first to third liquefied gas control valves 291 to 293 are added. Details of this will be described later.

Therefore, in the gas regasification system 2 according to the third embodiment of the present invention, configurations other than the first to third mixed gas control valves 281 to 283 and the first to third liquefied gas control valves 291 to 293 For convenience, the same reference numerals may be used for each configuration in the gas regasification system 2 according to the first and second embodiments, but do not necessarily refer to the same configuration.

Hereinafter, the gas treatment system 2 according to the third embodiment of the present invention will be described with reference to FIG. 4, and the first to third mixed gas control valves 281 to 283 and the first to third liquefied gas control The valves 291 to 293 will be described in focus.

In an embodiment of the present invention, the liquefied gas supply line L1 is composed of first to third liquefied gas supply lines L1a to L1c, and the mixed gas supply line L3 is the first to third mixed gas supply line. It is composed of (L3a to L3c).

This is detailed to explain the first to third trains configured in the regasification system, not an additional configuration, and is not shown in the first and second embodiments, but the first to second embodiments also A third train can be formed.

The first to third trains can be distinguished due to the liquefied gas supply pump 23 and the vaporizer 24 arranged in parallel with each other. For example, the first train is provided on the first liquefied gas supply line L1a. With the first liquefied gas supply pump 23a and the first vaporizer 24a, the second train includes a second liquefied gas supply pump 23b and a second vaporizer provided on the second liquefied gas supply line L1b. As 24b), the third train may be divided into a third liquefied gas supply pump 23c and a third vaporizer 24c provided on the third liquefied gas supply line L1c.

At this time, the mixed gas supply line L3 may also be connected to the liquefied gas supply pump 23 on each train.

That is, the first mixed gas supply line L3a is connected to the first liquefied gas supply pump 23a of the first train, and the second mixed gas supply line L3b is used to supply the second liquefied gas of the second train. It is connected to the pump 23b, and the third mixed gas supply line L3c may be connected to the third liquefied gas supply pump 23c of the third train.

However, in this embodiment, unlike the first and second embodiments, the mixed gas supply line L3 is configured not to be connected to the liquefied gas supply line L1. That is, in this embodiment, the liquefied gas supplied through the liquefied gas supply line L1 is not mixed with the mixed gas supplied through the mixed gas supply line L3.

Through this, in the present invention, the liquefied gas supplied through the liquefied gas supply line L1 can solve the problem of the pressure difference caused by the confluence of the mixed gas supplied through the mixed gas supply line L3. There is.

The liquefied gas supply pump 23 is configured in parallel with each other, at least one is controlled to receive only the mixed gas supplied through the in-line recondenser 22, and the remainder is inline material from the liquefied gas storage tank 10. It is controlled to receive only the liquefied gas supplied by bypassing the condenser 22.

At this time, the liquefied gas supply pump 23 may be independently delivered from each of the liquefied gas delivered by bypassing the in-line recondenser 22 and the mixed gas delivered through the in-line recondenser 22 without joining each other.

Here, the liquefied gas supply pump 23 may include first to third liquefied gas supply pumps 23a to 23c for each train as described above.

Specifically, the plurality of liquefied gas supply pumps 23, for example, the first liquefied gas supply pump 23a receives only the mixed gas supplied through the in-line recondenser 22, and supplies the second and third liquefied gases The pumps 23b and 23c are controlled to receive only liquefied gas supplied from the liquefied gas storage tank 10 by bypassing the in-line recondenser 22, and the first train is a mixed gas supplied through the in-line recondenser 22. The bay is regasified and supplied to the consumer 40, and the second and third trains may be controlled to regasify only the liquefied gas supplied by bypassing the in-line recondenser 22 and supply it to the consumer 40.

In this case, the amount of mixed gas supplied by the first liquefied gas supply pump 23a may be the same as the amount of liquefied gas supplied by each of the second and third liquefied gas supply pumps 23b and 23c. That is, the amount of mixed gas supplied by the first liquefied gas supply pump 23a is the same as the amount of liquefied gas supplied by the second liquefied gas supply pump 23b or the amount of liquefied gas supplied by the third liquefied gas supply pump 23c. can do.

The first to third mixed gas control valves 281 to 283 are provided on the first to third mixed gas supply lines L3a to L3c, respectively, and the first to third liquefied gas control valves 291 to 293 May be provided on the first to third liquefied gas supply lines L1a to L1c, respectively.

The first liquefied gas supply pump (23a) is supplied with only the mixed gas supplied through the in-line recondenser (22), and the second and third liquefied gas supply pumps (23b, 23c) are inline material from the liquefied gas storage tank (10). When only the liquefied gas supplied by bypassing the condenser 22 is supplied, the first mixed gas control valve 281 is opened, the second and third mixed gas control valves 282 and 283 are closed, and the first liquefied gas control valve It can be controlled to close 291 and open the second and third liquefied gas control valves 292 and 293.

Here, the first to third mixed gas control valves 281 to 283 and the first to third liquefied gas control valves 291 to 293 are connected by wire and/or wirelessly through a separate control unit (not shown). Can be controlled under control.

Through this control, in the present invention, the problem of the pressure difference caused by the confluence of the liquefied gas supplied through the liquefied gas supply line L1 with the mixed gas supplied through the mixed gas supply line L3 can be solved at the source. There is an effect.

As described above, the gas regasification system 2 according to the present invention has an in-line recondenser 22 in place of the suction drum to increase the arrangement efficiency and increase the processing efficiency of the boil-off gas.

In addition, the gas regasification system 2 according to the present invention can eliminate the pressure loss that may occur due to the construction of an in-line recondenser, thereby improving the driving reliability of the gas regasification system.

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 spirit of the present invention, those skilled 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
2: gas regasification system 10: liquefied gas storage tank
20: regasification device 21: feeding pump
22: inline recondenser 221: auxiliary pump
23: liquefied gas supply pump 23a to 23c: first to third liquefied gas supply pump
24: carburetor 24a to 24c: first to third carburetor
25: low pressure boil-off gas compressor 26: heat exchanger
27: pressure regulating valve 271: first pressure sensor
272: second pressure sensor 281 to 283: first to third mixed gas control valve
291 to 293: first to third liquefied gas control valve 30: liquefied gas supply device
40: customer 50: high pressure boil-off gas compressor
L1: liquefied gas supply line L1a to L1c: first to third liquefied gas supply line
L2: liquefied gas branch line L3: mixed gas supply line
L3a~L3c: first to third mixed gas supply line L4: boil-off gas supply line
L5: Boil-off gas bypass line E: Propulsion engine
P: propeller S: propulsion shaft

Claims (10)

A liquefied gas supply pump configured to pressurize the liquefied gas discharged from the liquefied gas storage tank and configured in parallel with each other;
A vaporizer comprising a plurality of pieces and being connected to the liquefied gas supply pump, respectively, to vaporize the liquefied gas pressurized by the liquefied gas supply pump into a heat medium and supply it to a customer;
An in-line recondenser for mixing boil-off gas and liquefied gas discharged from the liquefied gas storage tank and transferring the mixture to the liquefied gas supply pump;
A boil-off gas supply line connected to the liquefied gas storage tank and the in-line recondenser;
A liquefied gas supply line consisting of a plurality of liquefied gas storage tanks and connected to the customer via respective liquefied gas supply pumps and vaporizers;
A liquefied gas branch line branched from an upstream of the liquefied gas supply pump in the liquefied gas supply line and connected to the in-line recondenser;
A mixed gas supply line consisting of a plurality and connected to each supply pump from the in-line recondenser;
Mixed gas control valves respectively provided on the mixed gas supply line; And
It includes liquefied gas control valves each provided on the liquefied gas supply line,
The liquefied gas supply pump,
Gas regasification, characterized in that at least one is controlled to receive only the mixed gas supplied through the in-line recondenser, and the rest is controlled to receive only the liquefied gas supplied by bypassing the in-line recondenser from the liquefied gas storage tank. system. The method of claim 1, wherein the liquefied gas supply pump,
A gas regasification system, characterized in that the liquefied gas delivered by bypassing the in-line recondenser and the mixed gas delivered through the in-line recondenser are independently supplied without confluence. The method of claim 1, wherein the liquefied gas supply pump,
It is composed of first to third liquefied gas supply pumps,
The first liquefied gas supply pump receives only the mixed gas supplied through the in-line recondenser,
The gas regasification system, characterized in that the second and third liquefied gas supply pumps receive only liquefied gas supplied from the liquefied gas storage tank by bypassing the in-line recondenser. The method of claim 3,
The amount of mixed gas supplied by the first liquefied gas supply pump is,
Gas regasification system, characterized in that the same as the amount of liquefied gas supplied by each of the second and third liquefied gas supply pumps. The method of claim 3, wherein the carburetor,
Consisting of first to third vaporizers and being connected to the first to third liquefied gas supply pumps, respectively, the first to third trains are formed together with the first to third liquefied gas supply pumps. Gas regasification system. The method of claim 5,
A boil-off gas supply line connected to the liquefied gas storage tank and the in-line recondenser;
First to third liquefied gas supply lines connected from the liquefied gas storage tank to the customer via the first to third liquefied gas supply pumps and the first to third vaporizers;
A liquefied gas branch line branched from an upstream of the first to third liquefied gas supply pumps in the first to third liquefied gas supply lines and connected to the in-line recondenser;
First to third mixed gas supply lines connected from the in-line recondenser to the first to third liquefied gas supply pumps;
First to third mixed gas control valves provided on the first to third mixed gas supply lines, respectively; And
The gas regasification system, further comprising first to third liquefied gas control valves provided on the first to third liquefied gas supply lines, respectively. The method of claim 6,
The first liquefied gas supply pump is supplied with only the mixed gas supplied through the in-line recondenser, and the second and third liquefied gas supply pumps bypass the in-line recondenser from the liquefied gas storage tank. If supplied,
Opening the first mixed gas control valve and closing the second and third mixed gas control valves,
And closing the first liquefied gas control valve and opening the second and third liquefied gas control valves. The method of claim 6,
Further comprising a low pressure boil-off gas compressor provided on the boil-off gas supply line,
The low pressure boil-off gas compressor,
A gas regasification system, characterized in that the boil-off gas stored in the liquefied gas storage tank is pressurized and supplied to the in-line recondenser. The method of claim 6,
A boil-off gas bypass line connected to the customer by bypassing the vaporizer from the liquefied gas storage tank; And
Gas regasification system, characterized in that it further comprises a high-pressure boil-off gas compressor provided on the boil-off gas bypass line. A ship comprising the gas regasification system of any one of claims 1 to 9.

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