KR20190042271A - Gas Treatment System, Vessel having the Gas Treatment System and FSRU Vessel having the Gas Treatment System - Google Patents

Abstract

According to one embodiment of the present invention, a gas treatment system includes: a bunkering line connecting a liquefied gas storage tank for unloading and a liquefied gas storage tank for loading; a boil off gas return line returning return boil off gas generated in the liquefied gas storage tank for loading; and a heat exchanger heat-exchanging liquefied gas supplied from the bunkering line with boil off gas supplied from the boil off return line, wherein the heat exchanger heat-exchanges the boil off gas with the liquefied gas to be supplied to the liquefied gas storage tank for unloading, thereby reducing increase in internal pressure of the liquefied gas storage tank for unloading.

Description

Technical Field [0001] The present invention relates to a marine floating structure including a gas processing system, a vessel including the gas processing system, and a floating structure including a gas processing system,

The present invention relates to a gas processing system, a vessel including a gas processing system, and a floating structure including a gas processing system.

Liquefied natural gas (Liquefied natural gas), Liquefied petroleum gas (Liquefied petroleum gas) and other liquefied gas are widely used in place of gasoline or diesel in recent technology development.

Liquefied natural gas is a liquefied natural gas obtained by refining natural gas collected from a gas field. It is a colorless and transparent liquid with almost no pollutants and high calorific value. It is an excellent fuel. On the other hand, liquefied petroleum gas is a liquid fuel made by compressing gas containing propane (C3H8) and butane (C4H10), which come from oil in oil field, at room temperature. Liquefied petroleum gas, like liquefied natural gas, is colorless and odorless and is widely used as fuel for household, business, industrial, and automotive use.

Such liquefied gas is stored in a liquefied gas storage tank installed on the ground or stored in a liquefied gas storage tank provided in a ship which is a means of transporting the ocean. The liquefied natural gas is liquefied to a volume of 1/600 The liquefaction of liquefied petroleum gas has the advantage of reducing the volume of propane to 1/260 and the content of butane to 1/230, resulting in high storage efficiency.

These liquefied gases are supplied to various customers and used. Recently, LNG carrier that uses LNG as fuel for LNG carriers that transport liquefied natural gas has been developed. The method used is applied to ships other than LNG carriers and FSRUs.

As a result, the demand for LNG bunkering vessels to supply LNG to LNG propulsion vessels has increased sharply due to the large number of vessels propelled by LNG as fuel. As a result, various research and development activities have been actively conducted to build LNG bunker vessels. It is a losing situation.

It is an object of the present invention to provide a gas treatment system and a gas treatment system capable of efficiently treating an evaporative gas generated when a liquefied gas is bunched on a liquefied gas propulsion vessel, A marine floating structure including a marine vessel and a gas treatment system.

It is also an object of the present invention to provide a gas processing system capable of realizing efficient processing of liquefied gas or vaporized gas in a liquefied gas propulsion vessel, a vessel including a gas processing system, Structure.

A gas treatment system according to an embodiment of the present invention includes a bunkering line connecting a liquefied gas storage tank for loading and a pre-stored liquefied gas storage tank; An evaporative gas return line for recovering the return evaporative gas generated in the pre-applied liquefied gas storage tank; And a heat exchanger for exchanging heat between the liquefied gas supplied from the bunkering line and the evaporation gas supplied from the evaporation gas return line, wherein the heat exchanger heat-exchanges the evaporation gas with the liquefied gas and supplies the heat to the liquefied gas storage tank So that an increase in internal pressure of the liquefied gas storage tank for unloading is reduced.

Specifically, the heat exchanger may be an inline type recondenser.

Specifically, the refrigerant may further include a branch line branched from the heat exchanger upstream of the evaporation gas return line and connected to the heat exchanger downstream.

Specifically, when the temperature of the evaporation gas supplied from the heat exchanger to the liquefied gas storage tank for loading is greater than a preset evaporation gas temperature, or the temperature of the liquefied gas supplied to the ship's liquefied gas storage tank in the heat exchanger is And controlling the branch line to be less than the predetermined liquefied gas temperature.

Specifically, when the temperature of the evaporation gas supplied from the heat exchanger to the liquefied gas storage tank for storage is equal to or lower than a predetermined evaporation gas temperature, the control unit controls the evaporation gas supplied to the heat exchanger through the evaporation gas return line, Wherein the control unit controls the heat exchanger to bypass the heat exchanger through the branch line when the temperature of the liquefied gas supplied from the heat exchanger to the line-applied liquefied gas storage tank is equal to or higher than the preset liquefied gas temperature, So that the supplied evaporated gas can be supplied to the heat exchanger.

Specifically, the control unit may further include a control valve provided on the branch line, and when the temperature of the evaporation gas supplied from the heat exchanger to the liquefied gas storage tank for the load is below the preset evaporation gas temperature, The control unit controls to open the opening of the valve to bypass the heat exchanger through the branch line and to supply the evaporative gas supplied to the heat exchanger through the evaporative gas return line to the heat exchanger, When the temperature of the gas is equal to or higher than the predetermined liquefied gas temperature, the opening degree of the regulating valve is closed to control the evaporated gas supplied to the heat exchanger through the evaporated gas return line to be supplied to the heat exchanger.

Specifically, a loading pump provided on the bunkering line for supplying the liquefied gas stored in the unloading liquefied gas storage tank to the pre-loaded liquefied gas storage tank; An evaporative gas compressor provided on the evaporative gas return line for compressing the evaporative gas generated in the propellant liquefied gas storage tank; A liquefied gas supply line which connects the liquefied gas storage tank for unloading with a propelling demand customer and supplies the liquefied gas stored in the liquefied gas storage tank for unloading to the propelling demand customer; A fuel supply pump provided on the liquefied gas supply line for supplying the liquefied gas stored in the liquefied gas storage tank for unloading to the propelling demand site; A vaporizer provided on the liquefied gas supply line for vaporizing the liquefied gas supplied from the fuel supply pump; And an evaporative gas supply line connecting the liquefied gas storage tank for loading and the propulsion demanding entity and supplying evaporative gas generated in the liquefied gas storage tank for unloading to the propelling demanding entity.

Specifically, the liquefied gas supply line and the evaporation gas supply line may be connected upstream of the evaporative gas compressor on the evaporative gas return line.

Specifically, the evaporation gas supply line may be connected to the vaporizer downstream of the liquefied gas supply line.

Specifically, the liquefied gas storage tank for the unloading can be a stand-alone storage tank that can withstand pressures of 5 to 10 bar.

Specifically, it may be a vessel characterized by including the gas treatment system.

In particular, it may be a floating marine structure characterized by including the gas treatment system.

The gas processing system according to the present invention can efficiently process the evaporated gas that is generated and returned upon bunkering, thereby preventing the waste of the evaporated gas.

Further, the gas treatment system according to the present invention has the effect of preventing the inner pressure of the liquefied gas storage tank of the bunkering vessel from rising during bunkering.

Further, the gas processing system according to the present invention is provided with a pipe-type recondenser to sufficiently secure a space for constructing the gas processing system and to prevent unnecessary waste of the evaporation gas, and the energy consumption Can be reduced.

In addition, the gas processing system according to the present invention has a buffer tank provided upstream of a high-pressure pump (boosting pump) to ensure stable liquefied gas inflow pressure to a high-pressure pump (booster pump), thereby increasing the stability of the gas processing system .

The gas treatment system according to the present invention controls the flow rate of the evaporative gas flowing into the pipe type recondenser through the state of the liquefied gas flowing into the high pressure pump (booster pump) Even if the buffer tank is not provided, stable liquefied gas inflow pressure can be stably secured to a high-pressure pump (booster pump), the space for construction can be optimized, and work to be performed in the evaporative gas compressor can be reduced, There is an effect.

In the gas treatment system according to the present invention, a pipe-type recondenser is installed downstream of the liquefaction device, a branch line connected to the pipe-type recondenser is provided by bypassing the liquefaction device, Can be reduced.

The gas processing system according to the present invention further includes an LP compressor for compressing and supplying the evaporation gas to the pipe-type recondensor in addition to the HP evaporation gas compressor for compressing and supplying the evaporation gas to the remapping apparatus for re-liquefying the evaporation gas So that the energy of the liquid remover can be reduced and the net consumption energy of the evaporative gas compressor can be reduced.

Further, the gas treatment system according to the present invention further includes a condensing tank for storing surplus liquefied gas downstream of the pipe-type recondenser, so that the energy of the ship can be efficiently used and the heat load of the liquefied gas storage tank can be reduced There is an effect that can be.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a conceptual view of a bunker implementation of a ship having a gas treatment system according to an embodiment of the present invention; FIG.
2 is a conceptual diagram of a gas processing system according to a first embodiment of the present invention.
3 is a conceptual view of a ship having a gas treatment system according to an embodiment of the present invention.
4 is a conceptual diagram of a gas processing system according to a second embodiment of the present invention.
5 is a conceptual diagram of a gas processing system according to a third embodiment of the present invention.
6 is a conceptual diagram of a gas processing system according to a fourth embodiment of the present invention.
7 is a conceptual diagram of a gas processing system according to a fifth embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The objects, particular advantages and novel features of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG. It should be noted that, in the present specification, the reference numerals are added to the constituent elements of the drawings, and the same constituent elements are assigned the same number as much as possible even if they are displayed on different drawings. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

Herein, the liquefied gas may be used to encompass all gaseous fuels generally stored in a liquid state such as LNG or LPG, ethane, ethylene, ammonia, etc. Illustratively, the term " Liquefied Natural Gas " And the case where it is not in a liquid state by heating or pressurization can also be expressed as a liquefied gas for convenience. This also applies to the evaporative gas.

In addition, LNG can be used to mean both NG (natural gas) and NG (supercritical state) for the sake of convenience. Boiling off gas (LNG) refers to natural vaporized LNG, As well as liquefied vaporized gas.

The liquefied gas can be referred to irrespective of the state change, such as liquid state, gas state, mixed state of liquid and gas, supercooled state, supercritical state, and the like. Further, it is apparent that the present invention is not limited to the liquefied gas to be treated, but may be a liquefied gas processing system and / or an evaporative gas processing system, and the systems of the following drawings may be applied to each other.

In addition, embodiments of the gas treatment systems 100 to 500 of the present invention may be combined with each other, and additions of the respective components may be made in an intersection with each other. The gas processing system 100 to 500 according to the embodiment of the present invention may be mounted on a hull (not shown).

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

FIG. 1 is a conceptual view of bunkering operation of a ship having a gas processing system according to an embodiment of the present invention, and FIG. 2 is a conceptual view of a gas processing system according to the first embodiment of the present invention.

1 and 2, a gas processing system 100 according to an embodiment of the present invention includes a liquefied gas storage tank 10 for loading, a loading pump 20, a fuel supply pump 21, A vaporizer 30, a pipe type recondenser 40, an evaporative gas compressor 50, a propulsion engine 60, and a pre-applied liquefied gas storage tank 70.

The vessel 1 according to the present invention may be a bunker vessel 1 and the vessel 2 supplied with liquefied gas by the bunker vessel 1 may be an LNG propulsion vessel 2. The ship 2 supplied with liquefied gas by the bunker vessel 1 is not necessarily limited to the LNG propulsion vessel 2 and may be any vessel equipped with an LNG storage tank such as an LNG carrier to be.

Hereinafter, a gas processing system 100 according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG.

Before describing the gas treatment system 100 according to the present invention, a liquefied gas unloading operation (bunming) of the vessel 1 including the gas treatment system 100 of the present invention shown in Fig. 1 will be described .

1, the bunkering vessel 1 is constructed so that the liquefied gas stored in the liquefied gas storage tank 10 for unloading is stored in the ship's liquefied gas storage tank 70 of the LNG propelling vessel 2 through the unloading pump 20, .

The liquefied gas stored in the liquefied gas storage tank 10 is supplied from the gas treatment system 100 to the pre-applied liquefied gas storage tank 70 via the bunkering line L1 after the treatment, The vaporized gas generated in the pre-applied liquefied gas storage tank 70 generated by the vaporizing gas return line L2 from the pre-liquefied gas storage tank 70 by the vaporized gas return line L2 is supplied to the gas treatment system 100 of the bunker vessel 1 And supplied to the post-processing propulsion engine 60 or the liquefied gas storage tank 10 for unloading.

The bunkering vessel 1 propels the liquefied gas stored in the liquefied gas storage tank 10 for unloading through a propulsion engine 60 that uses the liquefied gas as a fuel and the propulsion engine 60 performs processing in the gas processing system 100 The liquefied gas or the evaporated gas may be supplied through the liquefied gas supply line L3 and consumed. At this time, the propulsion engine 60 may also be referred to as a propulsion demanding entity.

The LNG propulsion vessel 2 propels the liquefied gas stored in the propelling liquefied gas storage tank 80 through a propulsion engine 83 that uses the liquefied gas as fuel and the propulsion engine 83 is a propulsion liquefied gas storage tank 80 to supply and consume liquefied gas. The liquefied gas stored in the propelling liquefied gas storage tank 80 is pressurized by the fuel supply pump 81 and is subjected to high pressure gasification in the fuel processing system 82 and then supplied to the propelling engine (83).

The liquefied gas storage tank of the LNG propulsion vessel 2 is separated into the propellant liquefied gas storage tank 70 and the liquefied gas storage tank for propulsion 80. However, The liquefied gas storage tank 70 may be a liquefied gas or an evaporative gas stored in the pre-applied liquefied gas storage tank 70, not the propellant liquefied gas storage tank 80, and the bunkering vessel 1 may use the liquefied gas storage tank 70 Not only the liquefied gas storage tank 80 but also the liquefied gas can be shipped to the liquefied gas storage tank 80 for propulsion.

Referring to FIG. 2, the gas treatment system 100 for performing the liquefied gas unloading operation (bunming) of the bunker vessel 1 described above will be described in detail.

Prior to describing the individual configurations of the gas processing system 100 according to the embodiment of the present invention, the basic flow paths for organically connecting the individual configurations will be described. Here, the passage is a passage through which the fluid flows, and may be a line. However, the present invention is not limited thereto.

In the embodiment of the present invention, the bunker line L1, the evaporation gas return line L2, the evaporation gas liquefaction line L2a, the evaporation gas branch line L2b, the evaporation gas consumption source supply line L2c, L3, and an evaporation gas supply line L5. Valves (not shown), which are adjustable in opening degree, may be installed in each line, and the supply amount of the evaporation gas or liquefied gas may be controlled according to the opening degree of each valve.

The bunkering line L1 connects the liquefied gas storage tank 10 and the line-applied liquefied gas storage tank 70 to each other and has a loading pump 20 for loading and unloading liquefied gas The liquefied gas stored in the gas storage tank 10 may be supplied to the pre-applied liquefied gas storage tank 70. Here, the bunkering line L1 may have a pipe-type recondenser 40 downstream of the unloading pump 20.

The evaporated gas return line L2 connects the propellant liquefied gas storage tank 70 and the propulsion engine 60 (propulsion demander) and has an evaporative gas compressor 50 to supply the propellant liquefied gas storage tank 70, And the compressed gas is compressed by the evaporative gas compressor 50 and then supplied to the propulsion engine 60.

The evaporation gas return line L2 may include a buffer tank B1 and a buffer tank B2 on the downstream and upstream sides of the evaporative gas compressor 50. The evaporation gas return line L2 may include a liquefied gas supply line L3, And an evaporation gas supply line L5 for supplying the evaporation gas generated in the gas storage tank 10 may be connected.

The evaporation gas return line L2 can be connected to the evaporation gas compressor L5 and the evaporation gas supply line L5 upstream of the evaporation gas compressor 50. Specifically, May be connected downstream of the vaporizer 30 on the liquefied gas supply line L3.

The evaporation gas return line L2 is branched from the buffer tank B1 and downstream of the evaporative gas compressor 50 to be connected to the liquefied gas storage tank 10 for the unloading operation and has a pipe type recondenser 40 The evaporation gas branching line L2a branched downstream from the pipe type recondenser 40 on the evaporation gas branching line L2a and branched downstream of the buffer tank B1 and connected to the evaporation gas branching line L2b, And a vaporizing gas consuming source supply line L2c connecting the consuming destination 61. [

The liquefied gas supply line L3 connects the upstream of the liquefied gas storage tank 10 and the buffer tank B2 and includes a fuel supply pump 21 and a vaporizer 30 to store the liquefied gas The liquefied gas stored in the tank 10 can be supplied to the propulsion engine 60.

The evaporation gas supply line L5 connects the upstream of the liquefied gas storage tank 10 and the buffer tank B2 for the unloading and connects the evaporation gas generated in the liquefied gas storage tank 10 to the propulsion engine 60, .

Hereinafter, the individual configurations that are organically formed by the above-described respective lines (L1 to L3) to implement the gas processing system 100 will be described.

The unloading liquefied gas storage tank 10 stores the liquefied gas to be supplied to the linear applied liquefied gas storage tank 70. The liquefied gas storage tank 10 for unloading must store the liquefied gas in a liquid state, at which time the liquefied gas storage tank 10 may have a pressure tank form.

Here, the liquefied gas storage tank 10 for the unloading is disposed inside the hull, and four, for example, can be formed in front of the engine room (not shown).

In addition, the unloading liquefied gas storage tank 10 may be a stand-alone storage tank that withstands a pressure of 5 to 10 bar (preferably 7 to 8 bar).

Accordingly, it is possible to at least partly accommodate the return evaporative gas generated when the liquefied gas is shipped to the pre-applied liquefied gas storage tank 70, thereby effectively processing the return evaporative gas. In the bunkering, There is no need to draw the pressurizing gas into the storage tank 10, and the bunching driving cost is reduced.

The unloading pump 20 is provided on the bunkering line L1 and is disposed inside or outside the liquefied gas storage tank 10 for loading and unloading the liquefied gas stored in the liquefied gas storage tank 10 for unloading To the liquefied gas storage tank (70).

Here, the unloading pump 20 may pressurize the liquefied gas discharged from the unloading liquefied gas storage tank 10 so that the pressure and the temperature may become somewhat higher, and the pressurized liquefied gas may still be in a liquid state.

In this case, the unloading pump 20 may be a sleeping pump when it is provided inside the unloading liquefied gas storage tank 10, and when it is installed outside the unloading liquefied gas storage tank 10, May be provided at a position inside the hull lower than the level of the liquefied gas stored in the storage tank 10 and may be a centrifugal pump.

The fuel supply pump 21 is provided on the liquefied gas supply line L3 and is provided inside or outside the liquefied gas storage tank 10 for storing liquefied gas stored in the liquefied gas storage tank 10 To the vaporizer (30).

Specifically, the fuel supply pump 21 is disposed between the liquefied gas storage tank 10 and the vaporizer 30 on the liquefied gas supply line L3 and stored in the liquefied gas storage tank 10 for the unloading The liquefied gas can be supplied to the vaporizer 30 by pressurization.

The fuel supply pump 21 may pressurize the liquefied gas stored in the liquefied gas storage tank 10 for loading to 5 to 20 bar and supply it to the vaporizer 30. [ Of course, the fuel supply pump 21 is not limited to the pressure of 5 to 20 bar but may be variable according to the required pressure of the vaporizer 30. Here, the fuel supply pump 21 may be provided in the liquefied gas storage tank The pressure and the temperature may be somewhat increased by pressurizing the liquefied gas discharged from the compressor 10, and the pressurized liquefied gas may still be in a liquid state.

At this time, the fuel supply pump 21 may be a sleeping pump if it is provided inside the liquefied gas storage tank 10 for loading, and may be a pump if it is installed outside the liquefied gas storage tank 10 for unloading. And may be provided at a position inside the hull lower than the level of the liquefied gas stored in the gas storage tank 10 and may be a centrifugal pump.

The vaporizer 30 is connected to the liquefied gas supply line L3 to vaporize the liquefied gas discharged from the fuel supply pump 21 and supply it to the evaporative gas compressor 50. [ At this time, a buffer tank B2 is provided upstream of the evaporative gas compressor 50, and the liquefied gas forcedly vaporized in the vaporizer 30 can be temporarily stored.

Specifically, the vaporizer 30 may be connected to the evaporation gas return line L2 via the evaporation gas compressor 60 upstream and the liquefied gas supply line L3. It is possible to vaporize the liquefied gas having a pressure of 20 bar and then supply the vaporized liquefied gas to the evaporative gas compressor 50.

The vaporizer 30 can vaporize the liquefied gas through a seawater supply line (not shown) in the case of the direct vaporization system. In the case of indirect vaporization, the vaporizer 30 is connected to the intermediate heat medium heat exchanger (Not shown) to supply the intermediate heat medium and exchange heat with the liquefied gas to vaporize the liquefied gas.

The pipe type recondenser 40 heat-exchanges the liquefied gas supplied from the bunkering line L 1 and the evaporated gas supplied from the evaporated gas return line L 2 to recondense the evaporated gas.

The pipe-type recondenser 40 recycles the evaporated gas to the liquefied gas storage tank 10 by heat-exchanging the evaporated gas with the liquefied gas and recycles the evaporated gas to the unloaded liquefied gas storage tank 10, Thereby suppressing an increase in internal pressure of the liquefied gas storage tank 10 for unloading.

Also, the pipe type recondenser 40 is configured to heat the liquefied gas with the evaporation gas to be supplied to the pre-applied liquefied gas storage tank 70 so that the temperature of the liquefied gas supplied to the pre- So that the liquefied gas can be appropriately supplied to the temperature required by the line-applied liquefied gas storage tank 70. [0065]

Existing recondensers are arranged on the liquefied gas processing system upstream of the high pressure pump and then supplied with evaporation gas and liquefied gas to re-condense the evaporated gas to the low temperature of the liquefied gas. Conventional recondensers in this system have been constructed in the form of a vessel to fit the net positive suction head (NPSH) of the high pressure pump and to increase the heat exchange surface area, and such conventional recondensers are very bulky and occupy a large space There were disadvantages. In addition, a complicated control program must be designed to regulate the water level of the recondenser and the internal pressure of the recondenser, which results in an additional cost.

Accordingly, in the embodiment of the present invention, the recondenser is manufactured as an in-line pipe type to solve all of the above problems.

That is, the pipe type recondenser 40 according to the embodiment of the present invention is manufactured as an in-line pipe type, and a nozzle (not shown) is formed. Due to the configuration of the nozzle, (BOG) to fine bubbles, and these minute bubbles are immediately recycled.

With this effect, the pipe-type recondenser 40 does not need to be manufactured in the form of a container to increase the heat exchange surface area, and thus the space can be minimized.

In addition, the pipe type recondenser 40 has the effect of minimizing the risk due to the control system being unnecessary and simplifying the control system, and it is possible to reduce the CAPEX because the configuration is very simple, There is an advantage.

In the embodiment of the present invention, a control unit (not shown) for measuring the temperature of the liquefied gas or the evaporated gas discharged from the pipe type recondenser 40 and controlling the flow rate of the evaporated gas flowing on the evaporated gas branch line L2b ).

Therefore, in the embodiment of the present invention, the temperature of the liquefied gas discharged from the pipe-type recondenser 40 or the temperature of the evaporation gas flowing on the evaporation gas branch line L2b (not shown) The control unit may further include a control valve V for controlling the flow rate, and the control unit may be connected to the temperature sensor and the control valve V in a wired or wireless manner so as to be controllable.

The control unit controls the temperature of the evaporative gas supplied from the pipe type recondenser 40 to the liquefied gas storage tank 10 for loading to exceed the preset evaporating gas temperature or from the pipe type recondenser 40 The evaporation gas branch line L2b can be controlled so that the temperature of the liquefied gas supplied to the tank 70 becomes lower than the preset liquefied gas temperature.

Specifically, when the temperature of the evaporation gas supplied from the pipe-type recondensor 40 to the liquefied gas storage tank 10 is equal to or lower than the preset evaporation gas temperature, the controller opens the opening of the regulating valve V, Type recondenser 40 through the evaporation gas return line L2 and bypasses the pipe type recondenser 40 through the evaporation gas branch line L2b to the pipe type recondenser 40, When the temperature of the liquefied gas supplied to the line-applied liquefied gas storage tank 70 is higher than the preset liquefied gas temperature, the opening degree of the regulating valve V is closed and the pipe type material So that the evaporated gas supplied to the condenser 40 can be controlled to be supplied to the pipe type recondenser 40.

As described above, the gas treatment system 100 according to the present invention can efficiently process the returning evaporative gas generated during bunkering, thereby preventing waste of evaporation gas, and preventing the liquefied gas of the bunker vessel 1 There is an effect that the internal pressure of the storage tank 10 can be prevented from rising.

In addition, the gas processing system 100 according to the present invention is provided with a pipe-type recondenser 40 so as to sufficiently secure a building space of the gas processing system 100 and to prevent unnecessary waste of evaporated gas There is an effect that the energy consumption of the re-liquefying device can be reduced.

The evaporation gas compressor 50 is provided on the evaporation gas return line L2 and compresses the liquefied gas or the evaporation gas supplied from the liquefied gas storage tank 10 for loading or the compressed liquefied gas storage tank 70, Thereby compressing the return evaporating gas generated in the combustion chamber.

The evaporating gas compressor 50 supplies the evaporation gas or the liquefied gas stored in the liquefied gas storage tank 10 to the propulsion engine 60 or the evaporation gas consuming unit 61, The return evaporating gas generated in the storage tank 70 and returned may be compressed and supplied to the propulsion engine 60 or the evaporation gas consuming unit 61.

Specifically, the evaporative gas compressor 50 compresses the liquefied gas stored in the liquefied gas storage tank 10 for loading through the liquefied gas supply line L3 and compresses the liquefied gas generated in the liquefied gas storage tank 10 It is possible to compress the return evaporating gas generated and generated in the line-applied liquefied gas storage tank 70 by using the evaporation gas supply line L5.

The evaporative gas compressor 50 can supply the compressed evaporative gas to the propulsion engine 60 through the evaporative gas return line L2 or to the evaporative gas consuming source 61 through the evaporative gas consuming source supply line L2c Or may be supplied to the liquefied gas storage tank 10 through the evaporation gas liquefaction line L2a.

The evaporative gas compressor 50 can be compressed to 5 to 20 bar when supplied to the propulsion engine 60 or the evaporative gas consumer 61 and is compressed to 5 to 10 bar when supplied to the liquefied gas storage tank 10 can do.

The propulsion engine 60 supplies thrust to the bunker vessel 1 using the liquefied gas or the evaporation gas stored in the liquefied gas storage tank 10 as fuel.

 As the piston (not shown) inside the cylinder (not shown) reciprocates by the combustion of the liquefied gas, the evaporative gas or the oil or the like, the propulsion engine 60 has a crankshaft (not shown) connected to the piston And a shaft (not shown) connected to the crankshaft can be rotated. Accordingly, the propulsion engine 60 can advance or backward the bunker vessel 1 as the propeller (not shown) connected to the shaft is rotated during driving.

In an embodiment of the present invention, the propulsion engine 60 may be a dual fuel engine (DFDE), but not limited thereto, a high pressure gas injection engine (MEGI) or a low speed two stroke low pressure gas injection engine (XDF). That is, the type of the propulsion engine 60 is not particularly limited.

The evaporation gas consuming destination 61 is branched downstream from the buffer tank B1 on the evaporation gas return line L2 and is connected to the evaporation gas consuming source supply line L2c and is connected to the liquid storage tank 10 And can consume the evaporated gas generated in the gas storage tank (70).

The evaporation gas consumer 61 may be, for example, a gas combustion apparatus (GCU), a boiler or a power generation engine (DFDG), but not limited thereto, all devices capable of consuming evaporative gas may be possible.

The pre-applied liquefied gas storage tank 70 stores the liquefied gas to be carried. The pre-applied liquefied gas storage tank 70 must store the liquefied gas in a liquid state, at which time the pre-loaded liquefied gas storage tank 70 may have the form of a pressure tank.

Here, the line-applied liquefied gas storage tank 70 is provided inside the LNG propulsion vessel 2, and three or four liquefied gas storage tanks 70 may be formed in front of the engine room (not shown). In addition, the line-applied liquefied gas storage tank 70 is not particularly limited to various types such as a membrane-type tank or an independent tank, for example.

The buffer tank B1 is disposed between the evaporative gas compressor 50 and the propulsion engine 60 on the evaporation gas return line L2 and supplies the evaporation gas to be supplied to the propulsion engine 60 or the evaporation gas consumption source 61 You can save it temporarily.

The buffer tank B1 can supply the evaporative gas at a stable pressure, temperature, or flow rate to the propulsion engine 60 or the evaporative gas consuming source 61 so that the efficiency of the propulsion engine 60 or the evaporative gas consuming source 61 There is an increasing effect.

The buffer tank B2 is disposed downstream of the evaporative gas compressor 50 on the evaporative gas return line L2 and can temporarily store the returned evaporative gas to be supplied to the evaporative gas compressor 50. [

The buffer tank B2 may also be connected to the liquefied gas supply line L3 and the evaporation gas supply line L5 to temporarily store the liquefied gas or the evaporation gas stored in the liquefied gas storage tank 10 for unloading.

The buffer tank B2 can supply the evaporation gas compressor 50 with a stable pressure or temperature of evaporation gas, and the efficiency of the evaporation gas compressor 50 is increased.

FIG. 3 is a conceptual view of a ship having a gas processing system according to an embodiment of the present invention, and FIG. 4 is a conceptual diagram of a gas processing system according to a second embodiment of the present invention.

3 and 4, a gas processing system 200 according to an embodiment of the present invention includes a liquefied gas storage tank T, a feeding pump P, a propulsion engine E, a pipe type recondenser A booster tank 220, a boosting pump 230, a vaporizer 240, and an evaporative gas compressor 250. [

It should be noted that the vessel 3 according to the present invention may correspond to all vessels having LNG storage tanks such as an LNG propulsion vessel, an LNG carrier, and an FSRU.

Hereinafter, the gas processing system 200 according to the embodiment of the present invention will be described with reference to FIGS. 3 and 4. FIG.

Prior to describing the individual configurations of the gas processing system 200 according to the embodiment of the present invention, the basic flow paths for organically connecting the individual configurations will be described. Here, the passage is a passage through which the fluid flows, and may be a line. However, the present invention is not limited thereto.

In the embodiment of the present invention, the liquefied gas supply line L4 may further include a liquefied gas return line L4a and an evaporation gas supply line L5. Valves (not shown), which are adjustable in opening degree, may be installed in each line, and the supply amount of the evaporation gas or liquefied gas may be controlled according to the opening degree of each valve.

The liquefied gas supply line L4 connects the liquefied gas storage tank T and the propulsion engine E and includes a feed pump P, a pipe type recondenser 210, a buffer tank 220, a high pressure pump 230 And a vaporizer 240 to supply the liquefied gas stored in the liquefied gas storage tank T to the propulsion engine E. [

Here, the liquefied gas supply line L4 may include a liquefied gas return line L4a branched between the pipe-type recondenser 210 and the buffer tank 220 and connected to the liquefied gas storage tank T . The detailed configuration of the liquefied-gas return line L4a will be described later.

The evaporation gas supply line L5 connects the liquefied gas storage tank T and the pipe type recondenser 210 and supplies the evaporated gas generated in the liquefied gas storage tank T to the pipe type recondenser 210 .

Hereinafter, the individual components that are organically formed by the above-described respective lines L4 to L5 to implement the gas processing system 200 will be described.

The construction of the liquefied gas storage tank T, the feeding pump P, the propulsion engine E and the vaporizer 240 are identical to those of the gas processing system 100 according to the first embodiment of the present invention The fuel supply pump 21, the propulsion engine 60 and the vaporizer 30 of the first embodiment of the present invention.

The pipe type recondenser 210 is provided on the liquefied gas supply line L4 and recovers the evaporated gas generated in the liquefied gas storage tank T through the liquefied gas stored in the liquefied gas storage tank T .

Specifically, the pipe type recondenser 210 is provided between the feeding pump P on the liquefied gas supply line L4 and the buffer tank 220, and is connected to the liquefied gas storage tank (not shown) through the evaporation gas supply line L5 T, and the liquefied gas in the liquefied gas storage tank T is supplied through the liquefied gas supply line L4 to re-condense the evaporated gas.

In the embodiment of the present invention, the liquefied gas return line L4a is configured to liquefy at least a part of the liquefied gas supplied from the pipe-type recondenser 210 when the internal pressure of the buffer tank 220 becomes equal to or higher than the preset tank pressure And return to the gas storage tank (T).

At this time, a regulating valve V may be provided on the liquefied gas return line L4a. When the internal pressure of the buffer tank 220 becomes less than the predetermined buffer tank pressure, the regulating valve V opens the opening , At least a part of the liquefied gas supplied from the pipe type recondenser 210 is returned to the liquefied gas storage tank T. When the internal pressure of the buffer tank 220 becomes equal to or higher than the preset tank pressure, So that all of the liquefied gas supplied from the pipe type recondenser 210 can be supplied to the buffer tank 220.

Accordingly, the gas processing system 200 according to the embodiment of the present invention can effectively manage the internal pressure of the buffer tank 220 and does not have a device for adjusting the pressure of the buffer tank 220, The cost is reduced.

The buffer tank 220 temporarily stores the liquefied gas supplied from the pipe-type recondenser 210, and then supplies the liquefied gas to the high-pressure pump 230.

The buffer tank 220 is provided between the pipe type recondenser 210 and the high pressure pump 230 on the liquefied gas supply line L4 and is supplied with the liquefied gas from the pipe type recondenser 210, The liquefied gas at a flow rate satisfying the effective suction head NPSH of the high pressure pump 230 can be supplied to the high pressure pump 230. [

As described above, the gas processing system 200 according to the present invention is provided with the buffer tank 220 upstream of the high-pressure pump 230 to ensure stable liquefied gas inflow pressure and flow rate into the high-pressure pump 230, There is an effect that the stability of the fuel cell 200 is increased.

The high pressure pump 230 is provided on the liquefied gas supply line L4 and can pressurize the liquefied gas supplied from the feeding pump P to a high pressure.

At this time, the high-pressure pump 230 can pressurize the liquefied gas in accordance with the pressure demanded by the propulsion engine E.

The evaporation gas compressor 250 is provided on the evaporation gas supply line L5 and compresses and supplies the evaporation gas generated in the liquefied gas storage tank T to the pipe type recondenser 210. [ Here, the evaporation gas compressor 250 can be controlled to supply the evaporation gas at a fixed capacity or a variable capacity.

When the internal pressure of the liquefied gas storage tank T becomes equal to or greater than a preset internal pressure, the evaporation gas compressor 250 compresses the evaporated gas and supplies it to the pipe type recondenser 210, It is possible that the evaporated gas generated in the liquefied gas storage tank T is not compressed in the liquefied gas storage tank T so as to be compressed in the liquefied gas storage tank T when the internal pressure of the liquefied gas storage tank T becomes less than the predetermined internal pressure.

Accordingly, the gas processing system 200 according to the embodiment of the present invention can effectively manage the internal pressure of the liquefied gas storage tank T, thereby improving the safety and reducing the waste of the evaporated gas .

5 is a conceptual diagram of a gas processing system according to a third embodiment of the present invention.

5, a gas processing system 300 according to an embodiment of the present invention includes a liquefied gas storage tank T, a feeding pump P, a propulsion engine E, a pipe type recondenser 310, A high pressure pump 320, a vaporizer 330, a first evaporative gas compressor 341, a second evaporative gas compressor 342, and a controller 360.

Hereinafter, a gas processing system 300 according to an embodiment of the present invention will be described with reference to FIG.

Prior to describing the individual configurations of the gas processing system 300 according to the embodiment of the present invention, the basic flow paths for organically connecting the individual structures will be described. Here, the passage is a passage through which the fluid flows, and may be a line. However, the present invention is not limited thereto.

In the embodiment of the present invention, the liquefied gas supply line L4, the evaporation gas supply line L5, the evaporation gas-recondenser supply line L5a, and the evaporation gas consumption source supply line L5b may be further included. Valves (not shown), which are adjustable in opening degree, may be installed in each line, and the supply amount of the evaporation gas or liquefied gas may be controlled according to the opening degree of each valve.

The liquefied gas supply line L4 connects the liquefied gas storage tank T and the propulsion engine E and includes a feed pump P, a pipe type recondenser 310, a high pressure pump 320 and a vaporizer 330, To supply the liquefied gas stored in the liquefied gas storage tank (T) to the propulsion engine (E).

The evaporation gas supply line L5 is connected to the liquefied gas storage tank T and the propulsion engine E and includes first and second evaporative gas compressors 341 and 342, So that the evaporation gas can be supplied to the propulsion engine E.

The evaporation gas supply line L5 is connected to the evaporation gas-recondenser supply line L5a (hereinafter referred to as " L5a ") branching between the first evaporative gas compressor 341 and the second evaporative gas compressor 342, And an evaporative gas consuming source supply line L5b branching between the first evaporative gas compressor 341 and the second evaporative gas compressor 342 and connected to the power generation engine 351 and the gas combustion device 352 .

Hereinafter, individual configurations that are organically formed by the above-described lines L4 to L5 to implement the gas processing system 300 will be described.

The configuration of the liquefied gas storage tank T, the feeding pump P, the propulsion engine E, the high-pressure pump 320 and the vaporizer 330 in the embodiment of the present invention is the same as that of the gas The configuration of the pre-loaded liquefied gas storage tank 70, the fuel supply pump 21, the propulsion engine 60 and the vaporizer 30 in the treatment system 100 and the gas treatment system 10 according to the second embodiment of the present invention, Pressure pump 230 in the high-pressure pump 200, so that the high-pressure pump 230 is replaced.

The pipe type recondenser 310 is provided without a separate buffer tank between the feeding pump P and the high pressure pump 320 on the liquefied gas supply line L4 and the evaporated gas supplied from the liquefied gas storage tank T Is recycled through the liquefied gas supplied from the liquefied gas storage tank (T).

The control unit 360 controls the flow rate of the evaporating gas supplied to the pipe-type recondenser 310 to satisfy the effective suction head NPSH of the high-pressure pump 32.

Therefore, in the embodiment of the present invention, a control valve 361 provided on the evaporation gas-recondenser supply line L5a for controlling the flow rate of the evaporation gas flowing on the evaporation gas-recondenser supply line L5a, A flow rate sensor 362 for measuring the flow rate of the liquefied gas or evaporation gas introduced into the high pressure pump 320 upstream of the high pressure pump 320 on the gas supply line L4, And the control unit 360 may be connected to the control valve 361 and the flow rate, pressure, measurement sensors 362, 363, 364 in a wired or wireless manner So that it can be controlled.

The control unit 360 compares the physical property values received from the measurement sensors 362, 363, 364 and the physical property values of the liquefied gas for satisfying the effective suction head of the high-pressure pump 320 and supplies them to the evaporation gas-recondenser supply line L5a, The flow rate of the evaporating gas supplied to the condenser 310 can be controlled.

Specifically, when the flow rate received from the flow sensor 362 is equal to or lower than the preset flow rate, the control unit 360 increases the opening ratio of the control valve 361 and supplies the pipe type Controls the flow rate of evaporated gas supplied to the recondenser (310) to be increased, and decreases the opening ratio of the control valve (361) when the flow rate delivered from the flow rate sensor (362) To control the flow rate of the evaporative gas supplied to the pipe type recondenser 310 from the re-condenser feed line L5a.

When the pressure received from the pressure sensor 363 is equal to or lower than the preset pressure, the control unit 360 increases the opening ratio of the control valve 361 and supplies the pipe type material When the pressure delivered from the pressure sensor 363 exceeds the predetermined pressure, the opening degree of the control valve 361 is decreased to control the flow rate of the evaporation gas- It is possible to control the flow rate of the evaporative gas supplied from the recondenser supply line L5a to the pipe type recondenser 310 to be reduced.

When the temperature received from the temperature sensor 364 is equal to or lower than the preset temperature, the control unit 360 increases the opening ratio of the control valve 361 and supplies the pipe type material And controls the flow rate of the evaporation gas supplied to the condenser 310 to be increased so as to decrease the opening ratio of the control valve 361 when the temperature delivered from the temperature sensor 364 exceeds the preset temperature, It is possible to control the flow rate of the evaporative gas supplied from the recondenser supply line L5a to the pipe type recondenser 310 to be reduced.

In addition, the control unit 360 may be controlled by receiving the property values from the respective measurement sensors 362 to 364 and combining them as described above.

Accordingly, in the embodiment of the present invention, the high-pressure pump 32 on the liquefied gas supply line L4 and the pipe-type recondenser 310 on the liquefied gas supply line L4, It is possible to prevent the buffer tank from being provided between the drain and the drain.

The gas treatment system 300 according to the present invention controls the flow rate of the evaporative gas flowing into the pipe type recondenser 310 through the state of the liquefied gas flowing into the high pressure pump 320, It is possible to stably secure the stable inflow pressure of the liquefied gas into the high-pressure pump 320 and to optimize the space for building, even if the buffer tank is not provided upstream of the high-pressure pump 320. [

In addition, the gas treatment system 300 according to the present invention can reduce the flow rate of the evaporation gas supplied to the evaporation gas compressors 341 and 342 per hour (100 to 200 kg / h), so that the evaporation gas compressors 341 and 342 can be driven And the power consumption of the evaporative gas compressors 341 and 342 can be reduced accordingly.

In the embodiment of the present invention, when the flow rate, temperature, and pressure received from the measurement sensors 362, 363, and 364 exceed the predetermined flow rate, temperature, and pressure, the opening ratio of the control valve 361 is decreased, The opening degree of the first bypass line L6a and the control valve 361 for supplying the evaporated gas which can not be supplied to the pipe type recondenser 310 from the supply line L5a to the liquefied gas storage tank 10 is reduced And a second bypass line L6b for supplying an evaporative gas not supplied to the pipe type recondenser 310 from the evaporation gas-recondenser feed line L5a to the upstream of the first evaporative gas compressor 341 can do.

In addition, in the embodiment of the present invention, the control unit 360 can control the first evaporation gas compressor 341 in addition to the control through the control valve 361. [

Specifically, when the physical property values (flow rate, temperature, pressure) received from the measurement sensors 362, 363 and 364 are equal to or less than predetermined property values, the controller 360 controls the driving performance of the first evaporative gas compressor 341 To increase the flow rate of the evaporative gas supplied from the evaporation gas-recondenser feed line L5a to the pipe type recondenser 310, and to control the flow rate of the evaporated gas supplied from the measurement sensor 362, 363, 364 to exceed the predetermined property value (For example, RPM is lowered) of the first evaporative gas compressor 341 to reduce the flow rate of the evaporative gas supplied from the evaporative gas-recondenser feed line L5a to the pipe-type recondenser 310 .

The evaporation gas compressors 341 and 342 are provided on the evaporation gas supply line L5 and are connected to a first evaporation source 331 for compressing and supplying the evaporation gas generated in the liquefied gas storage tank T to the pipe type recondenser 310, Is further provided downstream of the evaporation gas-recondenser supply line L5a on the gas compressor 341 and the evaporation gas supply line L5 and further compresses the evaporation gas compressed by the first evaporation gas compressor 341 to be supplied to the propulsion engine And a second evaporative gas compressor 342 for supplying the second evaporative gas compressor E to the second evaporative gas compressor 342. At this time, the evaporation gas-recondenser supply line L5a may have a shape branched off downstream of the first evaporative gas compressor 341 on the evaporative gas supply line L5, and the first evaporative gas compressor 341 may have a shape, The second evaporative gas compressor 342 is capable of compressing at least a part of the evaporated gas compressed in the first evaporative gas compressor 341. The second evaporative gas compressor 342 compresses all the evaporated gas generated in the liquefied gas storage tank T,

The evaporative gas compressors 341 and 342 further include a first evaporative gas compressor 341 for compressing at least a portion of the evaporative gas generated in the liquefied gas storage tank T and supplying the same to the pipe type recondenser 310, And a second evaporative gas compressor 342 provided on the gas supply line L5 and supplying at least a part of the evaporated gas generated in the liquefied gas storage tank T to the propulsion engine E . At this time, the evaporation gas-recondenser supply line L5a may be formed separately from the evaporation gas supply line L5, and the first and second evaporative gas compressors 341 and 342 may be formed in parallel in the liquefied gas storage tank T It is possible to at least partially compress the generated evaporated gas, respectively.

6 is a conceptual diagram of a gas processing system according to a fourth embodiment of the present invention.

6, a gas processing system 400 according to an embodiment of the present invention includes a liquefied gas storage tank T, a feeding pump P, a propulsion engine E, a pipe type recondenser 410, A high pressure pump 420, a vaporizer 430, and an ejector 440.

Hereinafter, a gas processing system 400 according to an embodiment of the present invention will be described with reference to FIG.

Before describing the individual configurations of the gas processing system 400 according to the embodiment of the present invention, the basic flow paths for organically connecting the individual configurations will be described. Here, the passage is a passage through which the fluid flows, and may be a line. However, the present invention is not limited thereto.

In the embodiment of the present invention, the liquefied gas supply line L4, the liquefied gas return line L4a, the evaporation gas-ejector suction line L4b, the liquefied gas-recondenser supply line L4c, L4d). Valves (not shown), which are adjustable in opening degree, may be installed in each line, and the supply amount of the evaporation gas or liquefied gas may be controlled according to the opening degree of each valve.

The liquefied gas supply line L4 connects the liquefied gas storage tank T and the propulsion engine E and includes a feeding pump P, a pipe type recondenser 410, a high pressure pump 420, a vaporizer 430, And an ejector 440 to supply the liquefied gas stored in the liquefied gas storage tank T to the propulsion engine E.

The liquefied gas return line L4a branches between the pipe type recondenser 410 and the high pressure pump 420 on the liquefied gas supply line L4 and is connected to the liquefied gas storage tank T and is connected to the pipe type recondenser Condensed gas discharged from the pipe type recondenser 410 can be returned to the liquefied gas storage tank T when the recondensed gas discharged from the pipe type recondensor 410 is not completely recondensed.

The ejector suction line L4b connects the ejector 440 and the liquefied gas storage tank T and can supply the evaporated gas generated in the liquefied gas storage tank T to the ejector 440. [

The liquefied gas-recondenser feed line L4c branches off upstream of the ejector 440 on the liquefied gas feed line L4 and is connected to the pipe type recondenser 410, At least a portion of the gas may be supplied to the pipe type recondenser 410.

The evaporation gas consuming source supply line L4d branches between the vaporizer 430 on the liquefied gas supply line L4 and the propulsion engine E and is connected to the power generation engine 451 and the gas combustion device 452, 430 to at least one of the power generation engine 451 and the gas combustion apparatus 452.

Hereinafter, the individual structures that are organically formed by the above-described respective lines L4 to L4d to implement the gas processing system 400 will be described.

The construction of the liquefied gas storage tank T, the feeding pump P, the propulsion engine E, the high-pressure pump 420 and the vaporizer 430 in the embodiment of the present invention is similar to that of the gas according to the first embodiment of the present invention The configuration of the pre-loaded liquefied gas storage tank 70, the fuel supply pump 21, the propulsion engine 60 and the vaporizer 30 in the treatment system 100 and the gas treatment system 10 according to the second embodiment of the present invention, Pressure pump 230 in the high-pressure pump 200, so that the high-pressure pump 230 is replaced.

The pipe type recondenser 410 is provided between the ejector 440 and the high pressure pump 420 on the liquefied gas supply line L4 and is connected to the ejector 440 through the liquefied gas supplied from the liquefied gas storage tank T, And recycles the mixed gas discharged from the evaporator.

At this time, the pipe-type recondenser 410 can be supplied with the liquefied gas from the liquefied gas-recondenser supply line L4c branching upstream of the ejector 440 on the liquefied gas supply line L4.

That is, the pipe type recondenser 410 completely recycles the mixed gas discharged from the ejector 440 through the liquefied gas supplied from the liquefied gas storage tank T and supplies it to the high-pressure pump 420, The effective suction head (NPSH) of the high-pressure pump 420 can be satisfied even without the buffer tank.

Accordingly, system construction cost is reduced, system reliability is improved, and driving safety is maximized.

The ejector 440 is provided on the liquefied gas supply line L4 and sucks the evaporated gas generated in the liquefied gas storage tank T through the liquefied gas supplied from the liquefied gas storage tank T.

Specifically, the ejector 440 is provided between the feeding pump P on the liquefied gas supply line L4 and the pipe-type recondenser 410 and is connected to the liquefied gas storage tank (not shown) through the evaporation gas-ejector suction line L4b T), and the evaporation gas generated in the liquefied gas storage tank T is sucked through the evaporation gas-ejector suction line L4b through the liquefied gas supplied through the liquefied gas supply line L4 and mixed And to the pipe type recondenser 410.

The pump type recondenser 410 can solve the cavitation problem that may occur when the ejector 440 is supplied to the high pressure pump 420, thereby improving system safety. In addition, since the structure of the ejector 440 has a simple structure, the reliability of the system is improved, and the space for construction is reduced, thereby increasing the space usability.

7 is a conceptual diagram of a gas processing system according to a fifth embodiment of the present invention.

7, a gas processing system 500 according to an embodiment of the present invention includes a liquefied gas storage tank T, a feeding pump P, a propulsion engine E, a pipe type recondenser 511, 512, a high pressure pump 521, a vaporizer 522, a heater 523, a re-liquefying device 530, a high-pressure evaporative gas compressor 541, a low-pressure evaporative gas compressor 542 and a condensing tank 560 .

Hereinafter, a gas processing system 500 according to an embodiment of the present invention will be described with reference to FIG.

Prior to describing the individual configurations of the gas processing system 500 according to the embodiment of the present invention, the basic flow paths for organically connecting the individual structures will be described. Here, the passage is a passage through which the fluid flows, and may be a line. However, the present invention is not limited thereto.

In the embodiment of the present invention, the liquefied gas supply line L4, the condensing tank supply line L4e, the evaporation gas supply line L5, the low-pressure evaporation gas compressor supply line L5c, the refill liquor supply line L5d, The recondenser first branch line L5e, and the recondenser second branch line L5f. Valves (not shown), which are adjustable in opening degree, may be installed in each line, and the supply amount of the evaporation gas or liquefied gas may be controlled according to the opening degree of each valve.

The liquefied gas supply line L4 connects the liquefied gas storage tank T and the propulsion engine E and includes a feeding pump P, a pipe type recondenser 511, a high pressure pump 521, a vaporizer 522, And a heater 523 to supply the liquefied gas stored in the liquefied gas storage tank T to the propulsion engine E.

The condensing tank supply line L4e is branched between the pipe type recondenser 511 and the high pressure pump 521 on the liquefied gas supply line L4 and connected to the high pressure or low pressure evaporative gas compressors 541 and 542 And may include a condensing tank 560. The condensing tank 560 may be a condensing tank.

At this time, the condensing tank supply line L4e may supply the evaporation gas generated in the condensing tank 560 to the evaporation gas supply line L5.

The low pressure evaporative gas compressor supply line L5c may branch off upstream of the high pressure evaporative gas compressor 541 on the evaporative gas supply line L5 and may be connected to the pipe type recondensers 511 and 512 respectively, And a low-pressure evaporative gas compressor 542 for compressing the evaporated gas generated in the evaporator 540 to a low pressure and supplying the compressed gas to the pipe-type recondenser (first recondenser) 512.

The liquefier supply line L5d may branch off at the downstream of the high pressure evaporative gas compressor 541 and may be connected to the liquefied gas storage tank T and may have a remelting device 530. [

The recondenser first branch line L5e is branched upstream of the liquefaction device 530 on the liquefaction device supply line L5d and can be connected to the pipe type recondenser 512 downstream of the liquefaction device 530 have.

The recondenser second branch line L5f may be branched downstream of the low pressure evaporative gas compressor 542 on the low pressure evaporative gas compressor supply line L5c and connected to the pipe type recondenser 511.

Hereinafter, individual structures that are organically formed by the above-described lines L4 to L5f to implement the gas processing system 500 will be described.

The configuration of the liquefied gas storage tank T, the feeding pump P, the propulsion engine E, the high-pressure pump 521 and the vaporizer 522 in the embodiment of the present invention is similar to that of the gas The configuration of the pre-loaded liquefied gas storage tank 70, the fuel supply pump 21, the propulsion engine 60 and the vaporizer 30 in the treatment system 100 and the gas treatment system 10 according to the second embodiment of the present invention, Pressure pump 230 in the high-pressure pump 200, so that the high-pressure pump 230 is replaced.

The pipe type recondensers 511 and 512 may be divided into a pipe type recondenser 512, which may be referred to as a first recondenser, and a pipe type recondenser 511, which may be referred to as a second recondenser. It is noted that the pipe type recondenser 512 can be used as the first recondenser and the pipe type recondenser 511 can be used as the second recondenser.

The first recondenser 512 is formed between the refill liquor 530 and the liquefied gas storage tank T on the refill liquor supply line L5d (the name may also be mixed with the refill liquor line) And is connected to the first branch line L5e and recycles the evaporated gas supplied from the first condenser branch line L5e through the liquefied gas supplied from the re-liquefier 530. [

In the embodiment of the present invention, when the pressure upstream of the liquefaction device 530 is equal to or higher than the predetermined pressure, at least a part of the evaporation gas supplied to the liquefaction device 530 is supplied to the first material through the first condenser branch line L5e And a first controller (not shown) for controlling the condenser 512 to be supplied to the condenser 512.

Accordingly, in the embodiment of the present invention, a first regulating valve (V1) provided on the recondenser first branch line (L5e) for controlling the flow of the evaporative gas on the first condenser branch line (L5e) And a pressure sensor (not shown) provided on the line L5d upstream of the liquefaction unit 530 to measure the pressure of the evaporation gas flowing into the liquefaction unit 530, 1 control valve (V1) and the pressure sensor in a wired or wireless manner. At this time, the pressure sensor may measure the pressure of the evaporating gas flowing into the remelting device 530, and may transmit the measured pressure value to the first controller by wire or wirelessly.

The first control unit opens the opening of the first regulating valve V1 to open at least a part of the evaporating gas supplied to the refueling apparatus 530 when the pressure upstream of the refueling apparatus 530 becomes equal to or higher than the preset pressure When the pressure upstream of the re-liquefier 530 becomes equal to the predetermined pressure, the first regulating valve V1 (the first regulating valve) is controlled to be supplied to the first regenerator 512 via the first condenser branch line L5e, So that all of the evaporated gas supplied to the re-liquefier 530 can be controlled to be supplied to the re-liquefier 530.

As described above, the gas treatment system 500 according to the present invention includes the pipe type recondenser 512 installed downstream of the liquefaction device 530, bypassing the liquefaction device 530, The first re-condenser first branch line L5e connected to the re-condenser 512 is installed to reduce the energy consumption of the re-liquefier 530. [

The second recondenser 511 is formed between the feeding pump P on the liquefied gas supply line L4 and the high pressure pump 521 and is connected to the recondenser second branch line L5f, And recycles the evaporated gas supplied from the second condenser branch line L5f through the supplied liquefied gas.

In the embodiment of the present invention, if the internal pressure of the liquefied gas storage tank T is equal to or higher than the predetermined internal pressure, at least a part of the evaporative gas generated in the liquefied gas storage tank T through the low- Condenser 512 and supplies at least a portion of the evaporative gas compressed through the low pressure evaporative gas compressor 542 to the second recondenser 511 if the load of the propulsion engine E is equal to or higher than the predetermined load (Not shown) for controlling the display device.

In the embodiment of the present invention, the second adjustment is provided upstream of the low-pressure evaporative gas compressor 542 on the low-pressure evaporative gas compressor supply line L5c and controls the flow rate of the evaporative gas supplied to the low- A third control valve V3 provided on the recondenser second branch line L5f for controlling the flow of evaporative gas on the second condenser line L5f, a liquefied gas storage tank T, (Not shown) for measuring the internal pressure of the propulsion engine E and a load sensor (not shown) for measuring the load of the propulsion engine E, and the second control portion may include a second and a third control valve V2 , V3), and pressure and load sensors, either wired or wirelessly.

The second control unit opens the second control valve V2 to discharge the liquefied gas from the liquefied gas storage tank T through the low pressure evaporative gas compressor 542 if the internal pressure of the liquefied gas storage tank T is equal to or higher than the preset internal pressure When the internal pressure of the liquefied gas storage tank T is lower than the preset internal pressure, the second control valve V2 is closed to control the flow rate of the liquefied gas It is possible to control all of the evaporated gas generated in the gas storage tank T to be supplied to the high-pressure evaporative gas compressor 541. [

If the load of the propulsion engine E is equal to or greater than the preset load, the second control unit opens the third control valve V3 so that at least a part of the evaporated gas compressed through the low-pressure evaporative gas compressor 542, 2 re-condenser 511 and when the load of the propulsion engine E is below the predetermined load, the third control valve V3 is closed so that the evaporation gas compressed through the low-pressure evaporative gas compressor 542 All of which are supplied to the first recondenser 512.

As described above, the gas treatment system 500 according to the present invention includes the high-pressure evaporative gas compressor 541 for compressing and supplying the evaporation gas to the re-liquefier 530 for re-liquefying the evaporated gas, and the pipe type recondensers 511 and 512 Pressure evaporative gas compressor 542 for compressing and supplying the evaporative gas to reduce the energy of the re-liquefier 530 and reduce the net consumption energy of the evaporative gas compressors 541 and 542. [

The heater 523 is provided downstream of the vaporizer 522 on the liquefied gas supply line L4 to raise the vaporized liquefied gas supplied from the vaporizer 522 to a temperature required by the propulsion engine E .

The heater 523 can use various heat mediums such as seawater, fresh water, and glycol water as a heat source, and the kind of heat medium is not particularly limited in the present invention.

The re-liquefier 530 may include a separate refrigerant device to re-liquefy at least a portion of the evaporated gas compressed in the high-pressure evaporative gas compressor 541 through another refrigerant.

The high pressure evaporative gas compressor 541 is provided on the evaporation gas supply line L5 and can compress the evaporation gas generated in the liquefied gas storage tank T to a high pressure and supply it to the propulsion engine E. [

The low pressure evaporative gas compressor 542 is provided on the low pressure evaporative gas compressor supply line L5c and compresses the evaporated gas generated in the liquefied gas storage tank T to a low pressure so as to be supplied to the first recondenser 511 and the second Can be supplied to the recondenser 512.

The condensing tank 560 is provided on the condensing tank supply line L4e and stores at least a part of the liquefied gas supplied from the second recondenser 511. [

In the embodiment of the present invention, the second recondenser 511 can be controlled as follows through structural coupling with the condensing tank 560, under the control of the first and second control portions.

The second recondenser 511 is capable of supplying at least a part of the evaporated gas generated in the liquefied gas storage tank T through the low pressure evaporative gas compressor 542 when the internal pressure of the liquefied gas storage tank T is equal to or higher than the preset pressure Condensed through the liquefied gas supplied through the liquefied gas supply line L4 and at the same time at least part of the recycled liquefied gas is introduced into the condensing tank 560 ). ≪ / RTI >

In the embodiment of the present invention, a fourth control valve (a condensing tank control valve, V4), which is provided upstream of the condensing tank 560 on the condensing tank supply line L4e and controls the flow of the liquefied gas supplied to the condensing tank 560, (Not shown) for adjusting the opening degree of the second control valve V2 and the fourth control valve V4 in accordance with the internal pressure of the liquefied gas storage tank T and the rod of the propulsion engine E .

Therefore, in the embodiment of the present invention, the third control section measures the load of the propulsion engine E and the pressure sensor that measures the internal pressures of the second and fourth control valves V2 and V4 and the liquefied gas storage tank T And can be connected to the load sensor by wire or wirelessly.

When the internal pressure of the liquefied gas storage tank T is equal to or higher than the preset pressure, the third control unit opens the opening of the second control valve V2 so that at least a part of the evaporated gas compressed in the low- When the load of the propulsion engine E becomes less than the preset load, the opening of the fourth control valve V4 is opened and the second re-condenser 511 At least a part of the re-condensed liquefied gas is supplied to and stored in the condensing tank 560 through the condensing tank supply line L4e, and when the internal pressure of the liquefied gas storage tank T is lower than the preset pressure, The valve V2 is closed to prevent the evaporation gas from flowing into the low pressure evaporative gas compressor 542 so that all of the evaporated gas generated in the liquefied gas storage tank T is accumulated in the liquefied gas storage tank T Or supplied to the high pressure evaporative gas compressor 541 The liquefied gas can be returned to the liquefied gas storage tank T through the re-liquefier 530. At the same time, when the load of the propulsion engine E becomes equal to or greater than the preset load, So that all of the liquefied gas recycled by the second recondenser 511 can be supplied to the propulsion engine E. [

The gas treatment system 500 according to the present invention further includes a condensing tank 560 for storing surplus liquefied gas downstream of the pipe type recondenser 511 to efficiently use the energy of the ship 3 So that the heat load of the liquefied gas storage tank T can be reduced.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the same is by way of illustration and example only and is not to be construed as limiting the present invention. It is obvious that the modification and the modification are possible.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

1: bunkering vessel 2,3: LNG propulsion vessel
10: liquefied gas storage tank for unloading 20: unloading pump
21: fuel supply pump 30: vaporizer
40: Pipe type recondenser 50: Evaporative gas compressor
60: Propulsion engine 61: Evaporation gas consumer
70: Liquefied gas storage tank for line application 80: Liquefied gas storage tank for propulsion
81: Fuel supply pump 82: Fuel processing system
83: Propulsion engine 100: Gas treatment system
B1, B2: Buffer tank T: Liquefied gas storage tank
P: Feeding pump E: Propulsion engine
S: Shaft P: Propeller
V: Control valves V1 to V4: First to fourth control valves
200: Gas treatment system 210: Pipe type recondenser
220: Buffer tank 230: High pressure pump
240: vaporizer 250: evaporative gas compressor
300: Gas treatment system 310: Pipe type recondenser
320: high-pressure pump 330: vaporizer
341: first evaporative gas compressor 342: second evaporative gas compressor
351: Power generation engine 352: Gas combustion device
360: control unit 361: control valve
362: Flow sensor 363: Pressure sensor
364: Temperature sensor 400: Gas treatment system
410: Pipe type recondenser 420: High pressure pump
430: vaporizer 440: ejector
451: Power generation engine 452: Gas combustion device
500: Gas treatment system 511: Pipe type recondenser
512: Pipe type recondenser 521: High pressure pump
522: vaporizer 523: heater
530: Liquefaction device 541: High pressure evaporative gas compressor
542: Low pressure evaporative gas compressor 551: Power generation engine
552: Gas burner 560: Condensing tank
L1: bunkering line L2: evaporation gas return line
L2a: Evaporative gas liquefaction line L2b: Evaporative gas branch line
L2c: supply line for vaporizing gas L3: liquefied gas supply line
L4: liquefied gas supply line L4a: liquefied gas return line
L4b: Evaporative gas - Ejector suction line L4c: Liquefied gas - Re-condenser supply line
L4d: Supply line for vaporizing gas L4e: Supply line for condensing tank
L5: Evaporative gas supply line L5a: Evaporative gas-recondensor supply line
L5b: supply line for evaporation gas consumption L5c: supply line for low-pressure evaporation gas compressor
L5d: Re-liquefier supply line L5e: Re-condenser first branch line
L5f: recondenser second branch line L6a: first bypass line
L6b: second bypass line

Claims (12)

A bunkering line connecting the liquefied gas storage tank for unloading and the liquefied gas storage tank for line application;
An evaporative gas return line for recovering the return evaporative gas generated in the pre-applied liquefied gas storage tank; And
And a heat exchanger for exchanging heat between the liquefied gas supplied from the bunkering line and the evaporated gas supplied from the evaporated gas return line,
The heat exchanger
And the evaporation gas is heat-exchanged with the liquefied gas to be supplied to the liquefied gas storage tank for unloading, thereby reducing an increase in internal pressure of the liquefied gas storage tank for unloading. The heat exchanger according to claim 1,
And a pipe type recondenser (Inline type Recondenser). 3. The method of claim 2,
Further comprising a branch line branching upstream of the heat exchanger on the evaporative gas return line and connected downstream of the heat exchanger. The method of claim 3,
Wherein the temperature of the evaporation gas supplied from the heat exchanger to the liquefied gas storage tank for loading is greater than a preset evaporation gas temperature or the temperature of the liquefied gas supplied to the pre- Further comprising a control unit for controlling the branch line to be below the gas temperature. 5. The apparatus of claim 4,
Wherein the evaporating gas supplied to the heat exchanger through the evaporation gas return line is supplied to the heat exchanger through the branch line when the temperature of the evaporation gas supplied from the heat exchanger to the liquefied gas storage tank for the in- Bypass control,
And controlling the evaporator to supply the evaporative gas supplied to the heat exchanger through the evaporative gas return line to the heat exchanger when the temperature of the liquefied gas supplied to the linear liquefied gas storage tank in the heat exchanger is equal to or higher than a predetermined liquefied gas temperature Characterized by a gas treatment system. 6. The method of claim 5,
Further comprising an adjustment valve provided on the branch line,
Wherein,
Wherein the control valve is opened when the temperature of the evaporation gas supplied from the heat exchanger to the liquefied gas storage tank for unloading is equal to or lower than a predetermined evaporation gas temperature to discharge the evaporation gas supplied to the heat exchanger through the evaporation gas return line Controls to bypass the heat exchanger through the branch line,
When the temperature of the liquefied gas supplied to the pre-stored liquefied gas storage tank in the heat exchanger is equal to or higher than the pre-set liquefied gas temperature, the opening of the regulating valve is closed so that the evaporated gas supplied to the heat exchanger through the evaporated gas return line And to be supplied to the heat exchanger. The method according to claim 1,
A loading pump provided on the bunkering line for supplying the liquefied gas stored in the liquefied gas storage tank for unloading to the pre-applied liquefied gas storage tank;
An evaporative gas compressor provided on the evaporative gas return line for compressing the evaporative gas generated in the propellant liquefied gas storage tank;
A liquefied gas supply line which connects the liquefied gas storage tank for unloading with a propelling demand customer and supplies the liquefied gas stored in the liquefied gas storage tank for unloading to the propelling demand customer;
A fuel supply pump provided on the liquefied gas supply line for supplying the liquefied gas stored in the liquefied gas storage tank for unloading to the propelling demand site;
A vaporizer provided on the liquefied gas supply line for vaporizing the liquefied gas supplied from the fuel supply pump; And
Further comprising an evaporation gas supply line connecting the liquefied gas storage tank for unloading and the propulsion demanding entity and supplying evaporation gas generated in the liquefied gas storage tank for unloading to the propelling demanding entity, system. 8. The method according to claim 7, wherein the liquefied gas supply line and the evaporation gas supply line
And is connected upstream of the evaporative gas compressor on the evaporative gas return line. 9. The method according to claim 8, wherein the evaporation gas supply line
And is connected downstream of the vaporizer on the liquefied gas supply line. 2. The liquefied gas storage tank as claimed in claim 1,
Characterized in that it is a stand-alone storage tank withstanding pressure of 5 to 10 bar. A vessel comprising the gas treatment system of any one of claims 1 to 10. A floating structure (FSRU) comprising the gas treatment system of any one of claims 1 to 10.

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