KR102287825B1 - Gas Regasification System and Vessel having the same - Google Patents

Abstract

Gas regasification system according to an embodiment of the present invention, a liquefied gas storage tank for storing liquefied gas or boil-off gas; a gas turbine generator for generating electric power using the liquefied gas or the boil-off gas as a fuel; a gas combustion device for burning the boil-off gas; a heat recovery device for generating a heating medium by receiving exhaust gas discharged from at least one of the gas turbine generator and the gas combustion device; and a regasification device for regasifying the liquefied gas stored in the liquefied gas storage tank, wherein the regasification device operates by receiving the power generated from the gas turbine generator, and exhaust gas discharged from the heat recovery device It is characterized in that the liquefied gas is regasified through.

Description

Gas Regasification System and Vessel having the same}

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

In general, LNG is a clean fuel and is known to have more abundant reserves than petroleum, and its usage is rapidly increasing as mining and transport technologies are developed. In such LNG, methane, the main component, is generally stored in a liquid state by lowering the temperature to -162 ° C or lower under 1 atm. The volume of liquefied methane is about 1/600 of the volume of gaseous methane, which is a standard state, is 0.42, which is about one-half of the share of crude oil.

LNG is liquefied due to its ease of transport and vaporized at the place of use after transport. However, there are concerns about installing LNG gasification facilities onshore due to the risk of natural disasters and terrorism.

For this reason, instead of the conventional liquefied natural gas regasification system installed on land, a regasification device is installed in an LNG carrier that transports liquefied natural gas, and a facility to supply vaporized natural gas to land (FSRU) is in the spotlight.

The LNG stored in the liquefied gas storage tank in the gas regasification device is pressurized by the boosting pump and sent to the LNG vaporizer, and is vaporized to NG in the LNG vaporizer and sent to the demand on land. Such a gas regasification device requires a lot of power and energy, and requires a high system operation reliability capable of continuous system operation.

Accordingly, various studies are being conducted to efficiently use power and energy used in this process and to enable continuous system operation.

The present invention was created to improve the prior art, and an object of the present invention is to provide a gas regasification system capable of reducing maintenance time and improving the driving reliability of the regasification system and a ship including the same will be.

Gas regasification system according to an embodiment of the present invention, a liquefied gas storage tank for storing liquefied gas or boil-off gas; a gas turbine generator for generating electric power using the liquefied gas or the boil-off gas as a fuel; a gas combustion device for burning the boil-off gas; a heat recovery device for generating a heating medium by receiving exhaust gas discharged from at least one of the gas turbine generator and the gas combustion device; and a regasification device for regasifying the liquefied gas stored in the liquefied gas storage tank, wherein the regasification device operates by receiving the power generated from the gas turbine generator, and exhaust gas discharged from the heat recovery device It is characterized in that the liquefied gas is regasified through.

Specifically, the regasification device may include: a feeding pump for supplying the liquefied gas stored in the liquefied gas storage tank to a consumer; a boosting pump that receives and pressurizes the liquefied gas from the feeding pump; and a vaporizer that receives the pressurized liquefied gas supplied from the boosting pump and heat-exchanges with a vaporization heating medium to regasify, wherein the vaporizer may allow the vaporization heating medium to receive heat from the exhaust gas supplied from the exhaust heat recovery device. .

Specifically, the vaporization heating medium may be seawater.

Specifically, the vaporizer may include: a heating medium circulation line through which the vaporized heating medium circulates; a heating medium pump provided on the heating medium circulation line and circulating the vaporized heating medium; a heating medium heat exchanger provided on the heating medium circulation line and transferring heat to the vaporizing heating medium by exchanging heat with the vaporizing heating medium and heat supplying heating medium; and an additional heat medium heat exchanger for exchanging heat between the heat supply heating medium and the exhaust gas supplied from the heat recovery device, wherein the heat supply heat medium receives heat supplied from the heat medium and the exhaust gas discharged from the heat recovery device. By transferring heat to the vaporization heating medium, the vaporization heating medium may regasify the liquefied gas.

Specifically, the vaporization heating medium may be an aqueous glycol solution or propane, the heat supplying heating medium may be seawater, and the heating medium may be steam.

Specifically, the apparatus may further include a steam turbine generator generating power through the heating medium supplied from the heat recovery device, wherein the regasification device may be operated by receiving power generated from the steam turbine generator.

Specifically, the steam turbine generator may supply an excess heat medium remaining after generating the electric power among the heat medium supplied from the heat recovery device to the additional heat medium heat exchanger.

Specifically, it may be a ship, characterized in that it includes the gas regasification system.

The gas regasification system according to the present invention supplies power to the regasification system through a heat recovery steam generator (HRSG), which has the effect of requiring less maintenance time compared to the power generation engine (GE), and enables stable operation. There is an effect that the driving reliability is extremely improved.

In addition, by supplying a heat source necessary for regasification of the regasification device through the surplus steam remaining in the heat recovery steam generator (HRSG) and exhaust gas discharged, there is an effect that the efficient use of energy is possible.

1 is a conceptual diagram of a ship having a gas regasification system according to an embodiment of the present invention.
2 is a conceptual diagram of a gas regasification system according to a first embodiment of the present invention.
3 is a conceptual diagram of a gas regasification system according to a second embodiment of the present invention.
4 is a conceptual diagram of a gas regasification system according to a third embodiment of the present invention.
5 is a conceptual diagram of a gas regasification system according to a fourth embodiment of the present invention.
6 is a conceptual diagram of a gas regasification system according to a fifth embodiment of the present invention.

The objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments taken in conjunction with the accompanying drawings. In the present specification, in adding reference numbers to the components of each drawing, it should be noted that only the same components are given the same number as possible even though they are indicated on different drawings. In addition, in describing the present invention, if it is determined that a detailed description of a related known technology may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

Hereinafter, in this specification, liquefied gas may be used to encompass all gas fuels that are generally stored in a liquid state, such as LNG or LPG, ethylene, ammonia, etc., and may refer to liquefied natural gas (LNG) by way of example, , a case that is not in a liquid state by heating or pressurization can also be expressed as a liquefied gas for convenience. This can be applied to boil-off gas as well.

In addition, for convenience, LNG can be used to encompass both NG (Natural Gas) in a liquid state as well as NG in a supercritical state. It can be used in the meaning of including liquefied boil-off gas as well as boil-off gas of.

Liquefied gas may be referred to regardless of a change in state, such as a liquid state, a gaseous state, a liquid and gas mixture state, a supercooled state, a supercritical state, and the like, and it should be noted that boil-off gas is also the same. In addition, it is obvious that the present invention is not limited to liquefied gas, but may be a liquefied gas processing system and/or a boil-off gas processing system, and the systems in the drawings to be implemented below may be applied to each other.

In addition, each embodiment of the gas regasification system 1 of the present invention may be configured in combination with each other, and of course, addition of each configuration may be made to cross each other. And the gas regasification system 1 according to an embodiment of the present invention may be mounted on the hull 100 .

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

1 is a conceptual diagram of a ship having a gas regasification system according to an embodiment of the present invention, and FIG. 2 is a conceptual diagram of a gas regasification system according to a first embodiment of the present invention.

1 and 2, the gas regasification system 1 according to an embodiment of the present invention includes a liquefied gas storage tank 10, a feeding pump 21, a buffer tank 21a, and a boosting pump 22 ), a vaporizer 30 , a consumer 41 , a power consumer 42 , a gas turbine 50 , a gas combustion device 70 , and a heat recovery device 80 .

Here, the feeding pump 21 , the buffer tank 21a , the boosting pump 22 , and the vaporizer 30 are provided in the regasification apparatus accommodating part 200 shown in FIG. 1 , and the gas turbine 50 , the gas combustion apparatus At 70, the heat recovery device 80 may be provided in the heat recovery device accommodating part 300 in the engine room ER shown in FIG. 1 .

Hereinafter, the gas regasification system 1 according to an embodiment of the present invention will be described with reference to FIG. 2 .

Before describing the individual components of the gas regasification system 1 according to the embodiment of the present invention, basic flow paths for organically connecting the individual components will be described. Here, the flow path is a passage through which the fluid flows and may be a line, and a control valve (not shown) for controlling the flow rate of the fluid may be provided on each line. do.

In the embodiment of the present invention, it may further include a regasification line (L1), a heat medium circulation line (L2), a seawater supply line (L3), an additional heat source supply line (L4), a steam supply line (L6). Valves (not shown) capable of adjusting the opening degree may be installed in each line, and the supply amount of boil-off gas or liquefied gas may be controlled according to the control of the opening degree of each valve.

The regasification line L1 connects the liquefied gas storage tank 10 and the demand 41, and includes a feeding pump 21, a buffer tank 21a, a high pressure pump 22, and a vaporizer 30, The liquefied gas stored in the liquefied gas storage tank 10 may be vaporized and supplied to the consumer 41 .

The heat medium circulation line L2 circulates a vaporized heat medium (a glycol aqueous solution or propane) to be supplied to the vaporizer 30 , and may include a heat medium pump 31 , a heat medium heat exchanger 32 and a vaporizer 30 .

The seawater supply line L3 is provided with a seawater pump SWP to supply seawater to the heat medium heat exchanger 32 , and may include a heat medium heat exchanger 32 .

The additional heat source supply line (L4) is branched on the seawater supply line (L3) and connected to the seawater supply line (L3) again, and may include an additional heat source first heat exchanger (33).

The steam supply line L6 connects the heat recovery device 80 and the additional heat source first heat exchanger 33 , and supplies the steam discharged from the heat recovery device 80 to the additional heat source first heat exchanger 33 . Thus, it is possible to supply the heat of steam, which is an additional heat source, to the seawater. The steam heat-exchanged in the additional heat source first heat exchanger 33 may be condensed and supplied to and stored in a separate condensed water storage tank (not shown).

Hereinafter, individual components that are organically formed by each of the above-described lines L1 to L4 and L6 to implement the gas regasification system 1 will be described.

The liquefied gas storage tank 10 stores the liquefied gas to be supplied to the demand 41 , the gas turbine 50 or the gas combustion device 70 . The liquefied gas storage tank 10 should store the liquefied gas in a liquid state. At this time, the liquefied gas storage tank 10 may have a pressure tank shape.

Here, the liquefied gas storage tank 10 is disposed inside the hull 100 and may be formed in four, for example, in front of the engine room ER. In addition, the liquefied gas storage tank 10 is, for example, a membrane type tank, but is not limited thereto, and the type is not particularly limited to various types, such as an independent tank.

The gas (liquefied gas or boil-off gas) stored in the liquefied gas storage tank 10 may be consumed by the gas turbine 50 , the gas combustion device 70 , etc. A gas supply unit (gas supply line (not shown), compressor (not shown), liquefied gas supply line (not shown), liquefied gas pump (not shown), etc.) may be provided to supply gas. . At this time, the liquefied gas may be vaporized by the vaporizer 30 to be described later and supplied to the gas turbine 50 or the gas combustion device 70 .

In an embodiment of the present invention, an oil storage tank (not shown) may be additionally provided. The oil storage tank stores oil. In this case, the oil may be MGO or the like, and may be a fluid having a liquid state even at room temperature. The type of oil is not particularly limited and may refer to any fluid fuel currently used in various ways in the marine field.

The oil stored in the oil storage tank may be consumed by the gas turbine 50 , the gas combustion device 70 , and the like, and an oil supply unit (oil supply unit) to supply oil to the gas turbine 50 or the gas combustion device 70 . A line (not shown), an oil pump (not shown), etc.) may be provided.

The feeding pump 21 is provided on the regasification line L1, is installed inside or outside the liquefied gas storage tank 10, and transfers the liquefied gas stored in the liquefied gas storage tank 10 to the buffer tank 21a. can supply

Specifically, the feeding pump 21 is provided between the liquefied gas storage tank 10 and the buffer tank 21a on the regasification line L1 to first pressurize the liquefied gas stored in the liquefied gas storage tank 10 . Thus, it can be supplied to the buffer tank 21a.

The feeding pump 21 may pressurize the liquefied gas stored in the liquefied gas storage tank 10 to 6 to 8 bar and supply it to the buffer tank 21a. Here, the feeding pump 21 may pressurize the liquefied gas discharged from the liquefied gas storage tank 10 to slightly increase the pressure and temperature, and the pressurized liquefied gas may still be in a liquid state.

At this time, the feeding pump 21 may be a submersible pump when provided inside the liquefied gas storage tank 10 , and stored in the liquefied gas storage tank 10 when installed outside the liquefied gas storage tank 10 . It may be provided at a position inside the hull 100 lower than the level of the liquefied gas and may be a centrifugal pump.

The buffer tank 21a may be connected to the regasification line L1 to receive the liquefied gas from the liquefied gas storage tank 10 and temporarily store it.

Specifically, the buffer tank 21a may receive the liquefied gas stored in the liquefied gas storage tank 10 from the feeding pump 21 through the regasification line L1, and liquefy by temporarily storing the supplied liquefied gas. Gas may be separated into a liquid phase and a gas phase, and the separated liquid phase may be supplied to the boosting pump 22 .

That is, the buffer tank 21a temporarily stores the liquefied gas to separate the liquid phase and the gas phase, and then supplies the complete liquid to the boosting pump 22 so that the boosting pump 22 satisfies the effective suction head (NPSH). , thereby preventing cavitation in the boosting pump 22 .

Here, the buffer tank 21a may be formed in a pressure vessel type capable of withstanding pressure, and may withstand 6 to 8 bar or 6 to 15 bar. Therefore, the buffer tank 21a supplies liquefied gas to the boosting pump 22 while maintaining a pressure of about 6 to 8 bar (or even 6 to 15 bar) to lower the compression load of the boosting pump 22. there is an effect

The boosting pump 22 may be provided between the buffer tank 21a and the vaporizer 30 on the regasification line L1, and is supplied from the liquefied gas supplied from the feeding pump 21 or the buffer tank 21a. The received liquefied gas may be supplied to the vaporizer 30 by pressurizing it to 80 to 120 bar.

The boosting pump 22 may pressurize the liquefied gas according to the pressure required by the demand 41 , and may be configured as a centrifugal pump.

The vaporizer 30 may be provided on the regasification line L1 to regasify the high-pressure liquefied gas discharged from the boosting pump 22 .

Specifically, the vaporizer 30 is provided on the regasification line L1 between the consumer 41 and the boosting pump 22 (at this time, a separate heater (not shown) downstream of the vaporizer 30 is provided. It is provided so that the vaporized liquefied gas can be supplied to the consumer 41 by heating it to the temperature required by the consumer 41.) After vaporizing the high-pressure liquefied gas supplied from the boosting pump 22 through the vaporizer 30 It can be supplied to the demand 41 .

The vaporizer 30 receives the vaporization heating medium through the heating medium circulation line L2, heats it with the liquefied gas to vaporize the liquefied gas, and circulates the vaporized heating medium heat-exchanged with the liquefied gas again through the heating medium circulation line L2.

The vaporizer 30 may further include a heat medium pump 31 and a heat medium heat exchanger 32 on the heat medium circulation line L2 to continuously supply a heat source to the vaporized heat medium.

At this time, the vaporizer 30, glycol aqueous solution (Glycol Water), propane (Propane), etc. can be used as a vaporization heating medium for vaporizing the liquefied gas, and the high-pressure vaporized liquefied gas can be supplied to the consumer 41 without a pressure change. can

The vaporizer 30 receives the circulating vaporizing heating medium to vaporize the liquefied gas, circulates the vaporized heating medium to the heating medium circulation line L2 through the heating medium pump 31, and circulates the vaporizing heating medium through the heating medium heat exchanger 32 to the vaporizing heating medium. It can transmit the heat source of seawater. That is, the heat source is transferred from the seawater to the vaporization heating medium and from the vaporization heating medium to the liquefied gas to realize the regasification of the liquefied gas. Here, the heat medium heat exchanger 32 may receive seawater (heat supply heat medium) through the seawater pump SWP and the seawater supply line L3 and exchange heat with the vaporization heat medium.

The vaporizer 30 may further include an additional heat source first heat exchanger 33 in order to additionally receive the heat source to the vaporization heating medium. In this case, the additional heat source first heat exchanger 33 may also be referred to as the additional heat medium first heat exchanger 33 .

The additional heat source first heat exchanger 33 is provided on the additional heat source supply line L4 branched from the seawater supply line L3, receives seawater from the additional heat source supply line L4, and receives the steam supply line L6. It is possible to supply steam heat source to seawater by receiving steam from each other and heat-exchanging it with each other.

That is, the additional heat source first heat exchanger 33 exchanges heat between seawater (heat supply heat medium) and steam (heat medium) supplied from the heat recovery device 80, and the vaporization heat medium receives heat supplied from the steam (heat medium). Heat exchange with seawater (heat supply heat medium) to regasify liquefied gas.

Through this, the heat recovery device 80 generates steam through the exhaust gas discharged from the gas turbine 50 for generating electricity, and the generated steam can be used to regasify the liquefied gas, thereby enabling efficient use of energy. there is

The consumer 41 may receive and consume the liquefied gas vaporized by the vaporizer 30 . Here, the customer 41 may be used by receiving and using the gaseous liquefied gas by vaporizing the liquefied gas, and may be a land terminal installed on land or an offshore terminal installed floating on the sea.

The power consumer 42 consumes power produced by the gas turbine generator 51 under supply control from the switch board SB, and may be various devices provided inside or outside the hull 100 .

At this time, when the hull 100 is an electric propulsion vessel, the generated power may be used for propulsion of the hull 100 .

The switch board SB processes the energy (electric power) produced by the gas turbine 50 .

The switch board SB may deliver electricity, which is energy produced by the gas turbine 50 , to various power consumers 42 in the hull 100 , and the most representative of the power consumers 42 is the hull 100 . It may be a motor (not shown) that turns a rotating shaft (not shown) for propulsion.

The gas turbine 50 consumes liquefied gas or boil-off gas supplied from the liquefied gas storage tank 10 to generate electricity. The gas turbine 50 includes a gas turbine generator 51 and may generate energy (electric power) by using the rotational force of an impeller (not shown) generated by combustion of gas.

The gas turbine 50 may supply electric power generated by the gas turbine generator 51 to the switch board SB and supply exhaust gas discharged during combustion of liquefied gas or boil-off gas to the exhaust heat recovery device 80 . there is.

The gas combustion device 70 burns boil-off gas generated in the liquefied gas storage tank 10 . To this end, a gas combustion line (not shown) connected from the liquefied gas storage tank 10 may be connected to the gas combustion device 70 , and the pressure of boil-off gas may be burned in the gas combustion device 70 to the gas combustion line. A valve (not shown) for regulating (reducing pressure, etc.) to a pressure for

Exhaust generated while the gas combustion device 70 burns boil-off gas is discharged to the outside through an exhaust discharge line (not shown), or an exhaust transmission line branched from the exhaust discharge line (not shown) It can be supplied to the heat recovery device 80 through the.

Therefore, in this embodiment, even if the duct burner that burns boil-off gas and transfers exhaust heat to the exhaust heat recovery device 80 is omitted, since the exhaust heat recovery device 80 can recover sufficient exhaust heat, steam generation can be stably and smoothly implemented. there is.

Since the gas combustion device 70 is provided with a large capacity capable of processing 100% of the boil-off gas generated in the liquefied gas storage tank 10, the amount of exhaust delivered through the exhaust delivery line is reduced to the heat recovery device 80. When converted to steam by the steam, a large amount of steam may be generated.

At this time, the generated steam may be supplied to the additional heat source first heat exchanger 33 through the steam supply line L6.

Since the gas combustion line has a small diameter, in order to supply 100% of the boil-off gas generated from the liquefied gas storage tank 10 to the gas combustion device 70, the flow pressure must be increased. Therefore, the gas combustion line may be provided with a separate compressor so that the flow pressure of the gas combustion line is maintained at least 5 bar or more.

The exhaust heat recovery device 80 recovers exhaust (or exhaust heat) to generate a heating medium. In this case, the heating medium may be steam, and the heat recovery device 80 may be an economizer. Hereinafter, for convenience, the heating medium is limited to steam. The exhaust heat recovery device 80 may heat water with exhaust to generate steam, and supply the steam to the additional heat source first heat exchanger 33 .

In this case, the exhaust used by the exhaust heat recovery device 80 may be exhaust generated from the gas turbine 50 . That is, when the gas turbine 50 emits exhaust while consuming gas, the emitted exhaust may be supplied to the exhaust heat recovery device 80 along the exhaust recovery line to contribute to steam production.

In addition, the heat recovery device 80 may generate steam by receiving exhaust gas generated when the gas combustion device 70 burns BOG. The gas combustion device 70 burns the boil-off gas of the liquefied gas storage tank 10, since the exhaust is an energy source that holds thermal energy, the present invention provides at least a portion of the exhaust gas discharged from the gas combustion device 70. may be transferred to the exhaust heat recovery device 80 . To this end, an exhaust transmission line may be provided from an exhaust discharge line through which exhaust exhaust from the gas combustion device 70 exits to the exhaust heat recovery device 80 .

The exhaust transmission line is connected from the gas combustion device 70 to the exhaust recovery line, and the exhaust of the gas turbine 50 may be combined with the exhaust of the gas combustion device 70 to be supplied to the exhaust heat recovery device 80 .

The exhaust heat recovery device 80 may be provided with a capacity capable of digesting all of the exhaust gas generated when the gas turbine 50 operates 100%.

However, when a problem occurs in the operation of the exhaust heat recovery device 80 and the operation of the exhaust heat recovery device 80 is stopped, the treatment of exhaust gas supplied through the exhaust recovery line may be a problem. Therefore, in the present invention, in order to prepare for a situation such as the shutdown of the exhaust heat recovery device 80, an exhaust discharge line (not shown) that allows the exhaust of the gas turbine 50 to bypass the exhaust heat recovery device 80 to be discharged to the outside. ) can be provided.

Combining the above-described configurations, the gas regasification system 1 of the first embodiment of the present invention will be described.

In the embodiment of the present invention, the above-described feeding pump 21, buffer tank 21a, boosting pump 22, and vaporizer 30 may be collectively referred to as a regasification device, and the regasification device is a liquefied gas storage tank. The liquefied gas stored in (10) is regasified.

The greatest feature of the present invention is that the regasification device operates by receiving power generated from the gas turbine generator 51 of the gas turbine 50 , and liquefies it through a heating medium (steam) supplied from the heat recovery device 80 . The gas can be regasified.

For this reason, the gas regasification system 1 according to the present invention supplies electric power to the regasification device through the heat recovery system (gas turbine 50, gas combustion device 70, and heat recovery device 80). Since the power generation engine GE can be omitted, there is an effect that the maintenance time is less than that of a system having the power generation engine GE, and the driving reliability is extremely improved because stable driving is possible.

In addition, by supplying a heat source necessary for regasification of the regasification device through steam supplied from the exhaust heat recovery device 80 , efficient use of energy is possible.

Specifically, the regasification apparatus may allow the vaporization heating medium circulated in the vaporizer 30 to receive heat from the heating medium (steam) supplied from the exhaust heat recovery device 80 .

Here, the vaporizer 30 may use a direct vaporization method using seawater as a vaporization heating medium, and may use an indirect vaporization method using a propane or glycol aqueous solution as a vaporization heating medium. In an embodiment of the present invention, an indirect vaporization method is used. to explain what it does.

The detailed configuration for allowing the vaporization heating medium to receive heat from the exhaust heat recovery device 80 is completed by providing the regasification device with the additional heat source first heat exchanger 33 .

The additional heat source first heat exchanger 33 exchanges heat between the heat supply heat medium (seawater) and the heat medium (steam) supplied from the heat recovery device 80, and the vaporization heat medium receives the heat supplied from the heat medium (steam). It heats up with (seawater) so that liquefied gas can be regasified.

In summary, the gas regasification system 1 according to the first embodiment of the present invention is a regasification device through a heat recovery system (gas turbine 50, gas combustion device 70, and heat recovery device 80). By supplying power to the power generation engine, there is an effect that the maintenance time is less than that of a gas regasification system having a power generation engine, and the driving reliability is extremely improved because stable driving is possible.

In addition, by supplying a heat source necessary for regasification of the regasification device through steam supplied from the exhaust heat recovery device 80 , efficient use of energy is possible.

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

Referring to FIG. 3 , the gas regasification system 1 according to the second embodiment of the present invention includes a liquefied gas storage tank 10 , a feeding pump 21 , a buffer tank 21a , a boosting pump 22 , It includes a vaporizer 30 , a consumer 41 , a power consumer 42 , a gas turbine 50 , a steam turbine 60 , a gas combustion device 70 , and a heat recovery device 80 .

In the gas regasification system 1 according to the second embodiment of the present invention, a steam turbine 60 is added in the gas regasification system 1 according to the first embodiment, and surplus steam instead of the steam supply line L6 The supply line L5 was added, and an additional heat source second heat exchanger 34 was added instead of the additional heat source first heat exchanger 33 .

Therefore, in the gas regasification system 1 according to the second embodiment of the present invention, the configuration except for the steam turbine 60, the additional heat source second heat exchanger 34 and the surplus steam supply line L5 is the first embodiment The same reference numerals may be used for each configuration and convenience in the gas regasification system 1 according to, but do not necessarily refer to the same configuration.

Hereinafter, a gas regasification system 1 according to a second embodiment of the present invention will be described with reference to FIG. 3 .

However, as described above, in the gas regasification system 1 according to the first embodiment of the present invention, in the configuration of the steam turbine 60, the additional heat source second heat exchanger 34 and the surplus steam supply line L5. Since there is a difference, the configuration of the steam turbine 60, the additional heat source second heat exchanger 34 and the surplus steam supply line L5 will be described in detail below, but the remaining configuration is the first embodiment shown in FIG. It replaces the bar described in the gas regasification system (1) according to. Here, the additional heat source second heat exchanger 34 may also be referred to as the additional heat medium second heat exchanger 34 .

The surplus steam supply line L5 connects the steam turbine 60 and the additional heat source second heat exchanger 34 , and supplies the surplus steam supplied from the steam turbine 60 to the additional heat source second heat exchanger 34 . can

The steam turbine 60 receives steam (heat medium) supplied from the heat recovery device 80 to generate electricity. Specifically, the steam turbine generator 61 receives the steam supplied from the heat recovery device 80 . drive to generate power. Here, in the exhaust heat recovery device 80 of the present invention, water may be heated with exhaust to produce steam, and the steam may be supplied to the steam turbine 60 .

The steam turbine 60 includes a steam turbine generator 61 and uses steam supplied from the heat recovery device 80 to rotate a multi-stage impeller (not shown) to produce energy (electric power), and the steam turbine Energy (power) produced by 60 may be supplied to the switch board SB to be supplied to the power consumption destination 42 .

However, the energy that can be produced by the steam turbine 60 may be based on the operation of the gas turbine 30 . Accordingly, the amount of energy produced by the steam turbine 60 may be smaller than that of the gas turbine 50 .

A line (not shown) for supplying steam from the heat recovery device 80 to the steam turbine 60 may be connected. The steam supply line transfers the steam generated in the exhaust heat recovery device 80 to the steam turbine 60 . At this time, steam may be condensed after rotating the steam turbine 60 , and condensed water may be recovered along a steam recovery line (not shown) connected from the steam turbine 60 to the exhaust heat recovery device 80 . A steam pump (not shown) may be provided in the steam recovery line to transport condensed water.

In addition, the present invention may provide an surplus steam supply line (L5) for branching steam from the steam turbine (60) and supplying the additional heat source to the second heat exchanger (34). The excess steam supply line L5 may be branched from the steam supply line or branched from the steam turbine 60 to discharge steam to the second heat exchanger 34 as an additional heat source.

The branching of the excess steam supply line L5 from the steam turbine 60 means that when the steam turbine 60 includes a multi-stage impeller, steam is branched and discharged after rotating some of the impellers. The steam turbine 60 may be operated by receiving steam of about 10 to 40 bar (eg 35 bar), about 400 degrees, and the additional heat source second heat exchanger 34 is lower than the steam supplied to the steam turbine 60 . Pressure and low temperature steam may be required.

Therefore, the surplus steam supply line (L5), the steam is branched out from the steam turbine 60 after partially rotating the impellers of the first and second stages in the steam turbine 60, decompressed and cooled while turning the impeller Steam may be supplied to the second heat exchanger 34 as an additional heat source.

That is, the energy of the steam required by the steam turbine 60 and the energy of the steam required by the additional heat source second heat exchanger 34 are different from each other. Energy recovery is possible. In addition, since the decompressed and cooled steam is delivered to a steam demander, it is possible to protect the second heat exchanger 34 as an additional heat source.

In the surplus steam supply line L5 , when a surplus occurs in the steam supplied from the heat recovery device 80 to the steam turbine 60 , the surplus may be discharged to an external steam demander. When the operation of the steam turbine 60 is completely stopped, the entire amount of steam generated by the heat recovery device 80 may be discharged to the outside as a surplus.

When the steam turbine 60 fails, rotation of the impeller included in the steam turbine 60 may not be made, so in preparation for this, the surplus steam supply line L5 may be branched from the steam supply line instead of the steam turbine 60 . there is. Of course, the surplus steam supply line L5 may be provided to be connected to the second heat exchanger 34 as an additional heat source after being branched from the steam supply line and the steam turbine 60 , respectively. Alternatively, the surplus steam supply line L5 may be directly connected to the surplus steam supply line L5 from the exhaust heat recovery device 80 .

However, even when the steam turbine 60 is operated, the flow rate that can consume steam may be reduced. In the present invention, the excess steam supply line ( The flow rate of steam discharged to the additional heat source second heat exchanger 34 through L5) may be adjusted, and a control unit (not shown) may be provided for this purpose.

The controller may sense the load of the steam turbine 60 and the flow rate of steam flowing to the steam supply line, and may adjust opening/closing (and/or opening degree) of the surplus steam supply line L5 . Since the load of the steam turbine 60 is an index indicating the flow rate of steam that can be consumed by the steam turbine 60 , the control unit compares the flow rate of steam to be supplied to the steam turbine 60 with the flow rate of steam in the steam supply line. Thus, it is possible to control the valve (not shown) provided in the excess steam supply line (L5) by calculating the surplus.

In addition, the control unit may adjust the pressure of the steam supplied from the surplus steam supply line L5 to the additional heat source second heat exchanger 34 by adjusting the opening degree of the valve provided in the surplus steam supply line L5. That is, if the valve is opened so that a greater amount of steam than the surplus is discharged to the additional heat source second heat exchanger 34 , the pressure of steam will be lowered, and a smaller amount of steam than the surplus is discharged to the additional heat source second heat exchanger 34 . As much as possible, leaving the valve open or not opening the valve will increase the steam pressure. According to this principle, the control unit may adjust the steam supply pressure of the steam turbine 60 .

The additional heat source second heat exchanger 34 is provided on the additional heat source supply line (L4) branched from the seawater supply line (L3), receives seawater from the additional heat source supply line (L4), and receives the surplus steam supply line (L5) ) can be supplied with surplus steam and exchange heat with each other to supply a heat source of steam to seawater.

That is, the additional heat source second heat exchanger 34 exchanges heat between seawater (heat supply heat medium) and excess steam (heat medium) supplied from the steam turbine 60, and the vaporization heat medium receives heat supplied from the steam (heat medium). Heat exchange with seawater (heat supply heat medium) to regasify liquefied gas.

Through this, the heat recovery device 80 generates steam through the exhaust gas discharged from the gas turbine 50 that produces power, and operates the steam turbine 60 with the generated steam to produce additional power, and use the additional power When there is excess steam remaining even for production or the steam turbine 60 becomes inoperable, the excess steam can be used to regasify liquefied gas, thereby enabling efficient use of energy.

The gas regasification system 1 of the second embodiment of the present invention will be described by synthesizing the above-described configurations.

In the embodiment of the present invention, the above-described feeding pump 21, buffer tank 21a, boosting pump 22, and vaporizer 30 may be collectively referred to as a regasification device, and the regasification device is a liquefied gas storage tank. The liquefied gas stored in (10) is regasified.

The biggest feature of the present invention is that the regasification device is operated by receiving power generated from the gas turbine generator 51 of the gas turbine 50 and the power generated from the steam turbine generator 61 of the steam turbine 60 , and , it is possible to regasify the liquefied gas through the excess steam supplied from the steam turbine 60 among the heating medium (steam) supplied from the heat recovery device 80 .

For this reason, the gas regasification system 1 according to the present invention is a regasification device through a heat recovery system (gas turbine 50, steam turbine 60, gas combustion device 70, and heat recovery device 80). By supplying power to the power generation engine (GE), it is possible to omit the power generation engine (GE), which has the effect of requiring less maintenance time compared to a system having a power generation engine (GE), and enables stable operation, resulting in extremely improved driving reliability. It works.

In addition, by supplying a heat source necessary for regasification of the regasification device through the surplus steam supplied from the steam turbine 60 among the steam supplied from the heat recovery device 80 , efficient use of energy is possible.

Specifically, the regasification apparatus may allow the vaporization heating medium circulated in the vaporizer 30 to receive heat from excess steam (heat medium) supplied from the steam turbine 60 .

Here, the vaporizer 30 may use a direct vaporization method using seawater as a vaporization heating medium, and may use an indirect vaporization method using a propane or glycol aqueous solution as a vaporization heating medium. In an embodiment of the present invention, an indirect vaporization method is used. to explain what it does.

The detailed configuration for allowing the vaporization heating medium to receive heat from the steam turbine 60 is completed by providing the regasification device with an additional heat source second heat exchanger 34 .

The additional heat source second heat exchanger 34 exchanges heat between the heat supply heat medium (seawater) and the heat medium (surplus steam) supplied from the steam turbine 60, and the vaporization heat medium receives heat supplied from the heat medium (surplus steam). It heats up the heat medium (seawater) so that the liquefied gas can be regasified.

In summary, the gas regasification system 1 according to the second embodiment of the present invention includes a heat recovery system (gas turbine 50 , steam turbine 60 , gas combustion device 70 , and heat recovery device 80 ). ), by supplying power to the regasification device, there is an effect that the maintenance time is less than that of a gas regasification system having a power generation engine, and the driving reliability is extremely improved because stable operation is possible.

In addition, by supplying a heat source necessary for regasification of the regasification apparatus through the surplus steam remaining in the exhaust heat recovery system, efficient use of energy is possible.

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

4, the gas regasification system 1 according to the third embodiment of the present invention includes a liquefied gas storage tank 10, a feeding pump 21, a buffer tank 21a, a boosting pump 22, It includes a vaporizer 30 , a consumer 41 , a power consumer 42 , a gas turbine 50 , a gas combustion device 70 , and a heat recovery device 80 .

In the gas regasification system 1 according to the third embodiment of the present invention, the additional heat source first heat exchanger 33 is omitted in the gas regasification system 1 according to the first embodiment, and the additional heat source supply line ( There is a difference in that L4) is configured to be connected to the exhaust gas outlet of the exhaust heat recovery device 80 .

Therefore, in the gas regasification system 1 according to the third embodiment of the present invention, all components may use the same reference numerals for convenience as each configuration in the gas regasification system 1 according to the first embodiment, but must be They do not refer to the same configuration.

Hereinafter, a gas regasification system 1 according to a third embodiment of the present invention will be described with reference to FIG. 4 .

However, as described above, in the gas regasification system 1 according to the first embodiment of the present invention, there is a difference in the configuration so that the additional heat source supply line L4 is connected to the exhaust gas outlet of the exhaust heat recovery device 80 . Therefore, hereinafter, the configuration of the additional heat source supply line L4 to be connected to the exhaust gas outlet of the exhaust heat recovery device 80 will be described in detail, but the rest of the configuration is the gas regasification system according to the first embodiment shown in FIG. 2 . It is replaced with the one described in (1).

In an embodiment of the present invention, the feeding pump 21, the buffer tank 21a, the boosting pump 22, and the vaporizer 30 may be collectively referred to as a regasification device, and the regasification device is a liquefied gas storage tank 10 ) to regasify the stored liquefied gas.

The greatest feature of the present invention is that the regasification device is operated by receiving power generated from the gas turbine generator 51 of the gas turbine 50 , and liquefied gas is produced through the exhaust gas discharged from the heat recovery device 80 . that can be regenerated.

For this reason, the gas regasification system 1 according to the present invention supplies electric power to the regasification device through the heat recovery system (gas turbine 50, gas combustion device 70, and heat recovery device 80), Since the power generation engine GE can be omitted, there is an effect that the maintenance time is less than that of a system having the power generation engine GE, and the driving reliability is extremely improved because stable driving is possible.

In addition, by supplying a heat source necessary for regasification of the regasification device through the exhaust gas discharged from the exhaust heat recovery device 80, efficient use of energy is possible.

Specifically, the regasification apparatus may allow the vaporization heating medium circulated in the vaporizer 30 to receive heat from the exhaust gas discharged from the exhaust heat recovery apparatus 80 .

Here, the vaporizer 30 may use a direct vaporization method using seawater as a vaporization heating medium, and may use an indirect vaporization method using a propane or glycol aqueous solution as a vaporization heating medium. In an embodiment of the present invention, an indirect vaporization method is used. to explain what it does.

The detailed configuration for the vaporization heating medium to receive heat from the exhaust gas discharged from the exhaust heat recovery device 80 is completed by connecting the additional heat source supply line L4 to the exhaust gas outlet of the exhaust heat recovery device 80 .

The additional heat source supply line L4 exchanges heat between the heat supply heat medium (seawater) and the exhaust gas discharged from the exhaust heat recovery device 80, so that the vaporization heat medium exchanges heat with the heat supply heat medium (seawater) that has received the heat supplied from the exhaust gas. Allow the liquefied gas to be regasified.

In summary, the gas regasification system 1 according to the third embodiment of the present invention is a regasification device through the exhaust heat recovery system (gas turbine 50, gas combustion device 70, and exhaust heat recovery device 80). By supplying power to the power generation engine, there is an effect that the maintenance time is less than that of a gas regasification system having a power generation engine, and the driving reliability is extremely improved because stable driving is possible.

In addition, by supplying a heat source necessary for regasification of the regasification device through the exhaust gas discharged from the exhaust heat recovery system, there is an effect that the efficient use of energy becomes possible.

5 is a conceptual diagram of a gas regasification system according to a fourth embodiment of the present invention.

5, the gas regasification system 1 according to the fourth embodiment of the present invention includes a liquefied gas storage tank 10, a feeding pump 21, a buffer tank 21a, a boosting pump 22, It includes a vaporizer 30 , a consumer 41 , a power consumer 42 , a gas turbine 50 , a steam turbine 60 , a gas combustion device 70 , and a heat recovery device 80 .

In the gas regasification system 1 according to the fourth embodiment of the present invention, the additional heat source second heat exchanger 34 is omitted in the gas regasification system 1 according to the second embodiment, and the additional heat source supply line ( There is a difference in that L4) is configured to be connected to the exhaust gas outlet of the exhaust heat recovery device 80 .

Accordingly, in the gas regasification system 1 according to the fourth embodiment of the present invention, all components may use the same reference numerals for convenience as each configuration in the gas regasification system 1 according to the second embodiment, but must be They do not refer to the same configuration.

Hereinafter, a gas regasification system 1 according to a fourth embodiment of the present invention will be described with reference to FIG. 5 .

The biggest feature of the present invention is that the regasification device is operated by receiving power generated from the gas turbine generator 51 of the gas turbine 50 and the power generated from the steam turbine generator 61 of the steam turbine 60 , and , it is possible to regasify the liquefied gas through the exhaust gas discharged from the exhaust heat recovery device 80 .

As described above, in the gas regasification system 1 according to the fourth embodiment of the present invention, a steam turbine 60 is additionally constructed from the third embodiment of the present invention and recovers from the steam turbine generator 61 . It is the same except that the ignition device receives additional power.

That is, the gas regasification system 1 according to the fourth embodiment of the present invention is a heat recovery system (gas turbine 50, steam turbine 60, gas combustion device 70, and heat recovery device 80). By supplying power to the regasification device through There is an extremely improved effect, and the other configurations and effects are the same as those of the third embodiment, so they are replaced.

6 is a conceptual diagram of a gas regasification system according to a fifth embodiment of the present invention.

Referring to FIG. 6 , the gas regasification system 1 according to the fifth embodiment of the present invention includes a liquefied gas storage tank 10 , a feeding pump 21 , a buffer tank 21a , a boosting pump 22 , It includes a vaporizer 30 , a consumer 41 , a power consumer 42 , a gas turbine 50 , a steam turbine 60 , a gas combustion device 70 , and a heat recovery device 80 .

The gas regasification system 1 according to the fifth embodiment of the present invention has a configuration in which all the gas regasification systems 1 according to the first to fourth embodiments are combined, and a third heat exchanger 35 for an additional heat source The difference is that it is newly built.

Accordingly, in the gas regasification system 1 according to the fifth embodiment of the present invention, the configuration excluding the third heat exchanger 35 as an additional heat source is configured in the gas regasification system 1 according to the first to fourth embodiments. The same reference numerals may be used for each configuration and convenience, but do not necessarily refer to the same configuration. Here, the additional heat source third heat exchanger 35 may also be referred to as the additional heat medium third heat exchanger 35 .

Hereinafter, a gas regasification system 1 according to a fifth embodiment of the present invention will be described with reference to FIG. 6 .

The additional heat source third heat exchanger 35 is provided on the additional heat source supply line L4 and the surplus steam supply line L5, and supplies seawater after heat exchange with the exhaust gas in the exhaust heat recovery device 80 as an additional heat source. The heat source of the surplus steam may be supplied to the seawater after heat exchange with the surplus steam supplied through the line L4 and supplied through the surplus steam supply line L5 and heat exchanged with the exhaust gas in the exhaust heat recovery device 80 .

The greatest feature of the present invention is that efficient use of energy is achieved by supplying a heat source necessary for regasification of the regasification device through the surplus steam supplied from the steam turbine 60 and the exhaust gas discharged from the heat recovery device 80 . It has the effect of making it possible. Here, the regasification device may be a common name for all of the feeding pump 21 , the buffer tank 21a , the boosting pump 22 , and the vaporizer 30 .

Specifically, the regasification device may allow the vaporization heating medium circulated in the carburetor 30 to receive heat from the exhaust gas supplied from the exhaust heat recovery device 80 and the surplus steam (heat medium) remaining after being used in the steam turbine 60. there is.

Here, the vaporizer 30 may use a direct vaporization method using seawater as a vaporization heating medium, and may use an indirect vaporization method using a propane or glycol aqueous solution as a vaporization heating medium. In an embodiment of the present invention, an indirect vaporization method is used. to explain what it does.

The detailed configuration for allowing the vaporization heating medium to receive heat from the exhaust heat recovery device 80 is completed by providing the regasification device with an additional heat source third heat exchanger 35 .

The additional heat source third heat exchanger 35 exchanges heat between the heat supply heat medium (seawater) and the heat medium (surplus steam) supplied from the heat recovery device 80, and the vaporization heat medium receives the heat supplied from the heat medium (surplus steam). Heat exchange with the heat supply heat medium (seawater) to regasify the liquefied gas.

Here, the heat supply heat medium (seawater) passes through the exhaust gas outlet of the exhaust heat recovery device 80 , and the heat supply heat medium receives heat from the exhaust gas, so the additional heat source third heat exchanger 35 includes the exhaust heat recovery device 80 . By exchanging heat with the surplus steam supplied from the exhaust heat recovery device 80 with the heat supplying heating medium that has received heat from the exhaust gas discharged from the to allow it to be regenerated.

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

All simple modifications and variations of the present invention fall within the scope of the present invention, and the specific scope of protection of the present invention will be made clear by the appended claims.

1: gas regasification system 10: liquefied gas storage tank
21: feeding pump 21a: buffer tank
22: boosting pump 30: carburetor
31: heat medium supply pump 32: heat medium heat exchanger
33: additional heat source first heat exchanger 34: additional heat source second heat exchanger
35: additional heat source third heat exchanger 41: demand
42: electricity consumer 50: gas turbine
51: gas turbine generator 60: steam turbine
61: steam turbine generator 70: gas combustion unit (GCU)
80: heat recovery device (HRSG) 100: hull
200: regasification device receiving unit 300: heat recovery generator receiving unit
SWP: Seawater pump SB: Switch board
L1: regasification line L2: heating medium circulation line
L3: Seawater supply line L4: Additional heat source supply line
L5: Steam supply line

Claims (8)

a motor that turns the axis of rotation for propulsion of the hull;
a liquefied gas storage tank for storing liquefied gas or boil-off gas;
a gas turbine generator for generating electric power using the liquefied gas or the boil-off gas as a fuel;
a gas combustion device for burning the boil-off gas;
a heat recovery device for generating a heating medium by receiving exhaust gas discharged from at least one of the gas turbine generator and the gas combustion device; and
And a regasification device for regasification of the liquefied gas stored in the liquefied gas storage tank,
The regasification device,
regasification of the liquefied gas through the exhaust gas discharged from the exhaust heat recovery device;
Further comprising a switch board for processing the power generated by the gas turbine generator,
The switch board is
The power generated by the gas turbine generator is transmitted to the regasification device so that the regasification device operates, or by transmitting the power to the motor for propulsion of the hull, a power generation engine is omitted. According to claim 1, wherein the regasification device,
a feeding pump for supplying the liquefied gas stored in the liquefied gas storage tank to a consumer;
a boosting pump that receives and pressurizes the liquefied gas from the feeding pump; and
It includes a vaporizer for receiving the pressurized liquefied gas from the boosting pump and re-vaporizing by heat exchange with the vaporization heating medium,
the vaporizer,
A vessel, characterized in that the vaporization heating medium receives heat from the exhaust gas supplied from the exhaust heat recovery device. According to claim 2, wherein the vaporization heating medium,
A ship, characterized in that it is seawater. According to claim 2, wherein the vaporizer,
a heating medium circulation line through which the vaporized heating medium circulates;
a heating medium pump provided on the heating medium circulation line and circulating the vaporized heating medium;
a heating medium heat exchanger provided on the heating medium circulation line and transferring heat to the vaporizing heating medium by exchanging heat with the vaporizing heating medium and heat supplying heating medium; and
An additional heat medium heat exchanger for exchanging heat between the heat supply heat medium and the exhaust gas supplied from the exhaust heat recovery device,
The heat supply heating medium,
A ship, characterized in that by receiving heat supplied from the exhaust gas discharged from the heating medium and the exhaust heat recovery device and transferring the heat to the vaporization heating medium, the vaporization heating medium re-vaporizes the liquefied gas. 5. The method of claim 4,
The vaporization heating medium is an aqueous glycol solution or propane,
The heat supply heating medium is seawater,
The heating medium is a ship, characterized in that the steam. 6. The method of claim 5,
Further comprising a steam turbine generator for generating electric power through the heating medium supplied from the heat recovery device,
The regasification device,
A ship, characterized in that it is operated by receiving power generated from the steam turbine generator. The method of claim 6, wherein the steam turbine generator,
A ship, characterized in that for supplying the surplus heat medium remaining after generating the electric power among the heat medium supplied from the heat recovery device to the additional heat medium heat exchanger.
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