KR101571364B1 - LNG regasification system for ocean - Google Patents

LNG regasification system for ocean Download PDF

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Publication number
KR101571364B1
KR101571364B1 KR1020150078171A KR20150078171A KR101571364B1 KR 101571364 B1 KR101571364 B1 KR 101571364B1 KR 1020150078171 A KR1020150078171 A KR 1020150078171A KR 20150078171 A KR20150078171 A KR 20150078171A KR 101571364 B1 KR101571364 B1 KR 101571364B1
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KR
South Korea
Prior art keywords
working fluid
heat exchanger
heat
natural gas
seawater
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KR1020150078171A
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Korean (ko)
Inventor
박재홍
조성열
남상돈
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주식회사 엘에치이
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C7/00—Methods or apparatus for discharging liquefied, solidified, or compressed gases from pressure vessels, not covered by another subclass
    • F17C7/02—Discharging liquefied gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/03—Heat exchange with the fluid
    • F17C2227/0302—Heat exchange with the fluid by heating
    • F17C2227/0309—Heat exchange with the fluid by heating using another fluid
    • F17C2227/0316—Water heating
    • F17C2227/0318—Water heating using seawater
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/03—Heat exchange with the fluid
    • F17C2227/0367—Localisation of heat exchange
    • F17C2227/0388—Localisation of heat exchange separate
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2265/00—Effects achieved by gas storage or gas handling
    • F17C2265/05—Regasification

Abstract

The present invention relates to a marine liquefied natural gas regasification system. The present invention regasifies liquefied natural gas using seawater as a heat source to produce natural gas. The seawater supplies heat to working fluid which provides heat to regasify the liquefied natural gas. If additional heat is required, the regasification system supplementarily uses a heat source used by an equipment installed in the regasification system. Only a first heat exchanger (20) exchanges heat with the seawater to prevent the regasification system from deteriorating by the influence of seawater, and heat of the supplemental heat source is directly transferred to the working fluid. Moreover, in order to more efficiently use energy of the supplemental heat source, a temperature of the working fluid flowing into a second heat exchanger (30) from the first heat exchanger (20) is detected, and a control unit (38) adjusts an amount of the supplemental heat source into the second heat exchanger (30) based on the temperature of the working fluid. As the amount of the supplemental heat source is adjusted by a temperature adjustment valve (36), which is a proportional control valve, only a required amount of the supplemental heat source can be supplied to transfer the working fluid of a constant temperature to a gasifier (10) to gasify the liquefied natural gas more uniformly and reliably.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a LNG regasification system for ocean,

The present invention relates to a liquefied natural gas regasification system, and more particularly to a liquefied natural gas regasification system that vaporizes liquefied natural gas.

Liquefied natural gas (LNG) is a liquefied gas obtained by cooling a natural gas-derived methane-derived gas. Liquefaction of natural gas is advantageous in transportation and storage because it is less volatile in liquid than in gaseous form. Methane, a major component of natural gas, is liquefied when it is cooled down to below -161.5 degrees Celsius under 1 atm. The volume of liquefied methane is about 1/600 of the volume of methane in the gaseous state, The specific gravity is 0.42, which is about half of the specific gravity of crude oil.

To liquefy natural gas with liquefied natural gas, heat is extracted from natural gas and falls below -161.5 degrees Celsius. In this way, it is transported or stored in a liquefied state, and when it is used, it is supplied with heat again to make natural gas in a gaseous state.

A system for converting liquefied natural gas into gaseous natural gas is called a liquefied natural gas regeneration system. Such a liquefied natural gas regasification system may be installed onshore, but it is beneficial in terms of utilization to allow the retrofit system to be installed on the ocean. This is because, if the liquefied natural gas is regenerated and made into natural gas near the demand point of the natural gas, it can supply the natural gas quickly while maintaining the short transportation distance. For this purpose, there is a liquefied natural gas (LNG) regasification vessel (LNG-RV (Regasification Vessel)) equipped with a revitalization system on the ship, floating storage and regasification (FSRU Unit).

Thus, in the ocean re-gasification system, seawater is used as a heat source for vaporizing liquefied natural gas. However, when sea water is used, there is a problem that corrosion due to salt is generated a lot. Corrosion of the vaporizer by saline greatly reduces the durability of the regasification system.

In addition, depending on the seasons and the environment, it is not possible to regenerate liquefied natural gas properly with the heat obtained from seawater. In such a case, a heat source provided from a ship equipped with a regeneration system may be used. However, as the temperature of the seawater is increased by adding the heat of the heat source to the seawater, scale generation is further activated in the line or the heat exchanger channel through which the seawater flows and the heat exchange performance is deteriorated.

In addition, there is a problem that the heat of the heat source is transmitted to the seawater, is further transferred to the working fluid from the seawater, and the heat transfer efficiency is lowered due to heat loss in the course of heat transfer to the vaporizer.

Korean Patent No. 10-0981146 Korean Registration Practical No. 20-0410836

It is an object of the present invention to solve the above-mentioned problems of the prior art, and to minimize the influence of the sea water used as a heat source for regenerating liquefied natural gas.

Another object of the present invention is to provide the heat provided by the auxiliary heat source for regasification of the liquefied natural gas directly to the working fluid to relatively increase the heat transfer efficiency of the regasification system.

A further object of the present invention is to ensure that the temperature of the working fluid delivered to the vaporizer and regenerating liquefied natural gas is correctly supplied to the set value.

According to an aspect of the present invention, there is provided a marine liquefied natural gas regasification system for gasifying liquefied natural gas into natural gas using heat of seawater, comprising: A vaporizer in which a heat of a working fluid flowing along a working fluid line is supplied as liquefied natural gas and is vaporized with natural gas and a stainless steel-based printed circuit board type heat exchanger is used; A first heat exchanger in which heat exchange between the working fluid and seawater occurs and a plate heat exchanger using titanium as a main material is used and a second heat exchanger having an inlet side connected to the first heat exchanger through a working fluid line, The fluid is introduced and the outlet side is connected to the vaporizer by a working fluid line, A temperature control valve connected to the auxiliary heat source supply line for supplying heat of the auxiliary heat source and the auxiliary heat source discharge line for discharging the auxiliary heat source and being controlled in proportion to the auxiliary heat source supply line, A second heat exchanger for supplying heat of the auxiliary heat source when the working fluid requires additional heat and an auxiliary supplied to the second heat exchanger based on state data of the working fluid to provide the heat required by the second heat exchanger, And a controller for operating the temperature control valve for controlling the amount of the heat source.

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As the second heat exchanger, a plate heat exchanger or a cell-plate heat exchanger using stainless steel as a main material is used.

The first heat exchanger is connected to a seawater inflow line for supplying seawater pumped by a seawater pump and a seawater discharge line for discharging seawater heat-exchanged in the first heat exchanger.

A working fluid pump for flowing a working fluid is installed at one side of the working fluid line.

Glycol is used as the working fluid.

At least one of the vaporizer, the first heat exchanger, and the second heat exchanger is used by being connected in parallel.

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Temperature data for controlling the temperature regulating valve is provided by a temperature sensor, which is installed in a working fluid line entering the second heat exchanger to sense the temperature of the working fluid.

A temperature sensor is further provided on the side of the working fluid outlet of the second heat exchanger and the side of the auxiliary heat source and a pressure sensor is further provided on the inlet side of the temperature control valve to provide status data to the controller.

In the liquefied natural gas regasification system for marine use according to the present invention, the following effects can be obtained.

In the present invention, since seawater heat is used but seawater passes through only the first heat exchanger of the re-gasification system and does not pass through the second heat exchanger or the like for utilizing the waste heat, the regeneration system is minimized from being affected by seawater So that the durability of the regenerating system can be improved.

In particular, the vaporizer for vaporizing liquefied natural gas is an expensive product which must withstand high temperature and high pressure. Since the seawater does not pass through the vaporizer, durability can be enhanced, and the durability of the regeneration system of the liquefied natural gas is increased.

In addition, since the printed circuit board type heat exchanger is used in the vaporizer, the size of the vaporizer can be reduced, and the space required for the installation can be minimized, thereby reducing the size of the liquefied natural gas regeneration vessel or the regeneration facility.

In the present invention, since the heat provided from the auxiliary heat source is transferred to the working fluid already heat-exchanged in the first heat exchanger and the working fluid is heat-exchanged with the liquefied natural gas in the vaporizer, the heat of the auxiliary heat source is converted into the liquefied natural gas The energy efficiency of the entire system can be increased.

Further, in the present invention, in transferring the heat from the auxiliary heat source to the working fluid, the temperature of the working fluid heat-exchanged with the seawater is measured, and the temperature information is used in the control section to operate the column of the auxiliary heat source by a required amount The amount of heat can be more accurately transferred to the working fluid, so that the energy can be efficiently used and the vaporization amount designed in the vaporizer and the gas temperature after vaporization can be maintained at a constant level.

In the present invention, since the heat of the auxiliary heat source is transmitted to the working fluid and does not affect the discharge temperature on the side of the sea water line, there is no need to install a sea water recirculation line for preventing the problems caused by the increase in the temperature of the sea water .

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a configuration of a preferred embodiment of a liquefied natural gas regeneration system for marine use according to the present invention; FIG.
FIG. 2 is an operating state view showing that the working fluid, seawater, auxiliary heat source, etc. are used while flowing in the embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to exemplary drawings. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following description of the present invention, detailed description of known functions and configurations incorporated herein will be omitted when it may make the understanding why the present invention is not thereby well understood.

In describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected or connected to the other component, Quot; may be "connected," "coupled," or "connected. &Quot;

As shown in the figure, the gas inlet line 12 and the gas discharge line 14 are connected to the vaporizer 10. Liquefied natural gas enters the vaporizer 10 through the gas inlet line 12 and the vaporized natural gas is exhausted from the vaporizer 10 through the gas outlet line 14. As the vaporizer 10, a printed circuit heat exchanger (PCHE) is used. The main material constituting the vaporizer 10 is stainless steel. The printed circuit board type heat exchanger can be applied to a high pressure of 80 bar or more by using stainless steel, and is designed to suppress the icing phenomenon as much as possible. The liquefied natural gas delivered to the vaporizer 10 has a pressure of about 80 bar and a temperature of about -160 degrees Celsius. Since the printed circuit board type heat exchanger is relatively small, it is advantageous to be installed in a marine facility.

For reference, the vaporizer 10 is shown as being composed of only one heat exchanger in the illustrated embodiment, but a plurality of vaporizers 10 may be connected in parallel. When a plurality of heat exchangers are used, the number of heat exchangers to be used may be selected according to the vaporization capacity. Even if maintenance is required for any of the heat exchangers, the remaining heat exchangers can be used, so that the entire apparatus can be continuously operated without shut-down.

A gas inlet valve 12 'is provided in the gas inlet line 12 to control the flow of liquefied natural gas into the vaporizer 10 and a gas discharge valve 14' And controls the discharge of the natural gas vaporized in the vaporizer (10).

The gas inflow line 12 is provided with a gas pump 16. The gas pump 16 pumps a liquefied natural gas stored in a tank (not shown) as a high-pressure pump to the vaporizer 10.

The vaporizer (10) is connected to an operating fluid line (18). The working fluid line 18 forms one closed circuit, through which the working fluid flows. The working fluid receives the heat of seawater and provides heat necessary for vaporization of the liquefied natural gas in the vaporizer (10). As the working fluid, glycol (Glycol), which is a dihydric alcohol, is used. The glycol is characterized by a low point somewhat lower than water to protect the vaporizer 10 and the working fluid line 18 by allowing it to operate without freezing even if heat is taken from the vaporizer 10 to the low temperature liquefied natural gas .

A first heat exchanger (20) is installed at a position passing through the vaporizer (10) in the working fluid line (18). The first heat exchanger (20) is a portion where seawater and a working fluid heat-exchange. That is, the portion of the seawater where the working fluid is transferred. The first heat exchanger 20 may be a plate heat exchanger (PHE). Titanium (Ti) is used as a main material constituting the first heat exchanger (20). This is because the material is very resistant to seawater.

A plurality of the first heat exchangers 20 may be connected in parallel as in the vaporizer 10. When a plurality of first heat exchangers 20 are used, the number of the first heat exchangers 20 to be used may be selected according to the capacity of the entire apparatus. The remaining first heat exchanger 20 can be used even if maintenance is required in any one of the first heat exchangers 20, so that the entire apparatus can be continuously operated without shut-down.

The seawater inlet line 22 is connected to the first heat exchanger 20 to transfer the seawater to the first heat exchanger 20. The first heat exchanger 20 is also connected to a seawater discharge line 24 to discharge the heat-exchanged seawater from the first heat exchanger 20. The seawater inlet line 22 is provided with a seawater inlet valve 22 'for controlling the inflow of seawater and the seawater discharge line 24 is provided with a seawater discharge valve 24' for controlling the discharge of seawater.

The seawater inflow line 22 is provided with a seawater pump 26. The seawater pump 26 pumps seawater from the ocean and transfers it to the first heat exchanger 20 through the seawater inlet line 22.

A working fluid pump 28 is installed at one side of the working fluid line 18. The working fluid pump (28) allows the working fluid to flow in the working fluid line (18). Valves (not shown) are provided on the inlet side and the outlet side of the working fluid pump 28, respectively. These valves are also installed at the inlet and outlet of the first heat exchanger 20. By installing a valve at a portion corresponding to the inlet and outlet of each component, maintenance of the corresponding component can be facilitated. In the drawings, valves are not shown for all components for convenience of illustration.

A second heat exchanger (30) is installed at a position passing through the first heat exchanger (20) in the working fluid line (18). The second heat exchanger (30) is installed to be connected in series to the working fluid line (18). The second heat exchanger 30 may be connected to the working fluid line 18 in parallel. However, it is advantageous that the second heat exchanger (30) is connected in series to the working fluid line (18), which reduces the overall size of the regeneration system and reduces manufacturing costs. The second heat exchanger 30 may be a plate-type heat exchanger or a cell-plate heat exchanger, and the material thereof is mainly stainless steel. The second heat exchanger 30 may be connected to the vaporizer 10 or the first heat exchanger 20 in parallel.

The second heat exchanger (30) receives heat that can be obtained from a ship or facility equipped with the system of the present invention. For example, steam from a ship installed in the system of the present invention is used as a heat source. To this end, the auxiliary heat source inflow line 32 and the auxiliary heat source discharge line 34 are connected to the second heat exchanger 30, respectively. The auxiliary heat source inlet line 32 receives the auxiliary heat source and transfers the auxiliary heat source to the second heat exchanger 30. The auxiliary heat source discharge line 34 is connected to the auxiliary heat source 30 through the second heat exchanger 30, .

On the other hand, the amount of the auxiliary heat source entering the second heat exchanger (30) is adjusted by proportionally controlling the temperature control valve (36). The temperature control valve 36 is controlled through the control unit 38 and operated. The temperature regulating valve 36 regulates the amount of auxiliary heat source that is used to enter the second heat exchanger 30 by means of a proportional control valve. When the proportional control valve is used as the temperature control valve 36, the required amount of auxiliary heat source is transmitted to the second heat exchanger 30, so that the amount of the working fluid passing through the second heat exchanger 30 The temperature can be kept constant, so that the vaporization in the vaporizer 10 can always occur constantly.

The control unit 38 receives temperature data from a temperature sensor 40 installed in the working fluid line 18 and measuring the temperature of the working fluid entering the second heat exchanger 30. [ When the temperature sensor 40 provides the temperature of the working fluid entering the second heat exchanger 30 to the control unit 38, the control unit 38 determines the degree of opening of the temperature control valve 36 . That is, in accordance with the temperature data provided by the temperature sensor 40, the controller 38 controls the temperature regulating valve 36 to control the amount of the auxiliary heat source that enters the second heat exchanger 30, As shown in FIG.

In the illustrated embodiment, in addition to the temperature sensor 40, there are further additional temperature sensors 42, 44 and a pressure sensor 46. Basically, the temperature sensor 40 can obtain necessary temperature data, but additional sensors can be used to more accurately provide the heat that can be obtained from the auxiliary heat source. First, a temperature sensor 42 may be installed in the working fluid line 18 on the side of the second heat exchanger 30 where the working fluid is discharged.

A temperature sensor 44 may be installed in the auxiliary heat source discharge line 34 at the outlet side from which the auxiliary heat source is discharged from the second heat exchanger 30. Further, a pressure sensor 46 may be installed at the inlet side of the temperature control valve 36. The temperature sensor may be used as the pressure sensor 46. This is because when the steam is used as the auxiliary heat source, the temperature of the steam is determined according to the saturated steam pressure.

Hereinafter, the operation of the natural gas liquefied natural gas regeneration system according to the present invention will be described in detail.

In the present invention, the liquefied natural gas is pumped by using a gas pump 16, and is transferred to the vaporizer 10 through the gas inlet line 12 to be heat-exchanged with the working fluid to be vaporized. The liquefied natural gas entering the vaporizer 10 has a pressure of 80 bar and a temperature of -160 degrees C. The natural gas from the vaporizer 10 has a pressure of 80 bar and a temperature of about 12 degrees Celsius.

The working fluid provides heat for vaporization of liquefied natural gas in the vaporizer 10 and leaves the vaporizer 10 at a temperature outside of about 12 degrees Celsius. The working fluid is heat-exchanged with seawater in the first heat exchanger 20 to obtain heat. The temperature of the working fluid passing through the first heat exchanger 20 is about 25 degrees Celsius.

The first heat exchanger 20 pumps the seawater into the seawater inflow line 22 through the seawater pump 26. The first heat exchanger (20) is a plate type heat exchanger, and the seawater flowing along the adjacent flow path and the working fluid exchange heat to transfer heat from the seawater to the working fluid.

In the second heat exchanger (30), heat exchange occurs when the temperature of the working fluid detected by the temperature sensor (40) is lower than a predetermined value. That is, when the temperature of the working fluid flowing into the vaporizer 10 is lower than the set value, vaporization of the liquefied natural gas in the vaporizer 10 is not completed or the temperature of the vaporized natural gas is lower than the target temperature Therefore, the temperature of the working fluid is controlled. To this end, the controller 38 controls the operation of the temperature control valve 36 using the data provided by the temperature sensor 40 (in addition, the temperature sensors 42 and 44 and the pressure sensor 46) So that the amount of auxiliary heat source is transmitted to the second heat exchanger (30).

When the auxiliary heat source is transferred to the second heat exchanger (30) under the control of the temperature control valve (36), heat exchange occurs between the working fluid and the auxiliary heat source. The heat exchange in the second heat exchanger 30 occurs when the working fluid does not receive the desired amount of heat from the seawater and the temperature control valve 36 is activated by the necessary amount of auxiliary The heat source is transferred to the second heat exchanger 30 so that energy can be efficiently used.

The working fluid that has passed through the second heat exchanger 30 flows along the working fluid line 18 by the operation of the working fluid pump 28 and is transferred to the vaporizer 10 for vaporization of the liquefied natural gas And supplies the necessary heat. The working fluid from the vaporizer 10 has a value of about 12 degrees centigrade.

The working fluid that transfers heat to the liquefied natural gas from the vaporizer 10 flows out of the vaporizer 10 to the first heat exchanger 20 and repeats the process described above.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

In the illustrated embodiment, the vaporizer 10, the first heat exchanger 20, and the second heat exchanger 30 are used one by one. However, the vaporizer 10, the first heat exchanger 20, At least one of the first heat exchanger 20 and the second heat exchanger 30 may be connected in parallel. For example, a plurality of the vaporizers 10 may be connected in parallel, a plurality of the first heat exchangers 20 may be connected in parallel, or the vaporizer 10 may be connected to the first heat exchanger 20, A plurality of the vaporizer 10 and the second heat exchanger 30, the first heat exchanger 20 and the second heat exchanger 30 may be connected in parallel or a plurality of three may be connected in parallel .

10: vaporizer 12: gas inlet line
12 '; Gas inlet valve 14: Gas outlet line
14 ': gas discharge valve 16: gas pump
18: working fluid line 20: first heat exchanger
22: Seawater inflow line 22 ': Seawater inflow valve
24: seawater discharge line 24 ': seawater discharge valve
26: Seawater pump 28: Working fluid pump
30: second heat exchanger 32: auxiliary heat source inflow line
34: auxiliary heat source exhaust line 36: temperature control valve
38: control unit 40: temperature sensor

Claims (10)

CLAIMS 1. A liquefied natural gas regasification system for a marine liquefied natural gas, wherein the liquefied natural gas is vaporized with natural gas using heat of seawater,
A vaporizer in which a heat of a working fluid flowing along a working fluid line constituting one closed circuit is supplied as liquefied natural gas and is vaporized with natural gas and a printed circuit board type heat exchanger using stainless steel as a main material is used,
A first heat exchanger connected to the vaporizer through a working fluid line and performing heat exchange between the working fluid and seawater and using a plate heat exchanger having titanium as a main material;
The inlet side is connected to the first heat exchanger through a working fluid line, the working fluid having received heat from the first heat exchanger is introduced, and the outlet side is connected to the working fluid line through the vaporizer and connected in series to the working fluid line There is provided an auxiliary heat source supply line for supplying heat of the auxiliary heat source and an auxiliary heat source discharge line for discharging the auxiliary heat source and a temperature control valve proportional to the auxiliary heat source supply line, A second heat exchanger for supplying heat of the auxiliary heat source when additional heat is required,
And a controller for operating the temperature control valve to control the amount of the auxiliary heat source supplied to the second heat exchanger based on the state data of the working fluid to provide the heat required by the second heat exchanger, Gas regeneration system.
delete 2. The marine liquefied natural gas regeneration system according to claim 1, wherein said second heat exchanger is a stainless steel-based plate heat exchanger or a cell-plate heat exchanger.
The method according to claim 1, wherein the first heat exchanger is connected to a seawater inflow line for supplying seawater pumped by a seawater pump and a seawater discharge line for discharging seawater heat-exchanged in the first heat exchanger, Fire system.
The liquefied natural gas regeneration system for a marine system according to claim 1, wherein a working fluid pump for flowing a working fluid is installed on one side of the working fluid line.
The system of claim 1, wherein the working fluid is a glycol.
The system of claim 1, wherein at least one of the vaporizer, the first heat exchanger, and the second heat exchanger is connected in parallel.
delete 8. A method according to any one of claims 1 to 7, wherein the temperature data for controlling the temperature regulating valve is provided by a temperature sensor, the temperature sensor being installed in a working fluid line entering the second heat exchanger A liquefied natural gas regeneration system for the ocean that senses the temperature of the working fluid.
The apparatus of claim 9, further comprising a temperature sensor on the side of the working fluid outlet of the second heat exchanger and the outlet of the auxiliary heat source, further comprising a pressure sensor on the inlet side of the temperature control valve, Liquefied natural gas regasification system.
KR1020150078171A 2015-06-02 2015-06-02 LNG regasification system for ocean KR101571364B1 (en)

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KR101814908B1 (en) 2016-03-22 2018-01-04 현대중공업 주식회사 Regasification System of liquefied Gas
EP3279544A1 (en) 2016-08-03 2018-02-07 Cryostar SAS Regasification unit
KR20180000568U (en) * 2016-08-18 2018-02-28 대우조선해양 주식회사 LNG Regasification Apparatus and Ship including the same
KR20180075360A (en) * 2016-12-26 2018-07-04 현대중공업 주식회사 A Regasification System Of Gas and Vessel having the same
KR20180125321A (en) 2017-05-15 2018-11-23 (유)성문 LNG gasification apparatus for preventing explosion
KR20200103608A (en) * 2018-10-17 2020-09-02 한국조선해양 주식회사 Regasification System of liquefied Gas and Ship Having the Same
KR102384710B1 (en) * 2020-11-26 2022-04-08 대우조선해양 주식회사 Liquefied Gas Re-gasification System
CN115704529A (en) * 2021-08-09 2023-02-17 中国石油天然气集团有限公司 LNG constant temperature gasification's sea water heat transfer system
CN115704529B (en) * 2021-08-09 2024-04-30 中国石油天然气集团有限公司 LNG constant temperature gasification's sea water heat transfer system

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