KR102195226B1 - Floating marine structure with electric power generator - Google Patents

Abstract

A floating offshore structure is disclosed. The floating offshore structure according to the present invention may measure the temperature of LNG vaporized and discharged from the regasification unit, and adjust the amount of heat supplied to the regasification unit according to the measured temperature of the LNG. That is, the temperature of the heat supplied to the regasification unit can be adjusted according to the measured temperature of the LNG. Therefore, there may be an effect of vaporizing LNG in an optimal state.

Description

Floating offshore structure with power generation system {FLOATING MARINE STRUCTURE WITH ELECTRIC POWER GENERATOR}

The present invention relates to a floating offshore structure having a power generation system for vaporizing LNG of a regasification unit using steam discharged from the power generation unit.

Today, as part of interest in the environment, interest in eco-friendly power generation systems is increasing, and as a type of eco-friendly power generation system, there is a power generation system that uses natural gas such as LNG (Liquefied Natural Gas) as power generation fuel.

However, in order to build a power generation system that uses natural gas as power generation fuel on land, infrastructure such as gas storage tanks and gas supply devices are required. Therefore, natural gas is used as power generation fuel in island areas where the infrastructure is not equipped. It is difficult to build a power generation system.

In order to solve the above problems, a power generation system is installed on the hull equipped with a gas storage and gasification device, and a floating offshore structure that transmits power to its own use and land use after generating power from the hull. Has been developed and used.

Heat is required to vaporize a low-temperature gas.

However, since the conventional floating offshore structure cannot control the temperature of heat supplied to the regasification unit that vaporizes the gas, it is difficult to vaporize the gas vaporized in the regasification unit in an optimal state.

Prior art related to floating offshore structures is disclosed in Korean Patent Publication No. 10-2012-0038063 (April 23, 2012).

An object of the present invention may be to provide a floating offshore structure capable of solving all the problems of the prior art as described above.

Another object of the present invention may be to provide a floating offshore structure capable of vaporizing LNG in an optimal state by configuring to control the temperature of heat supplied to the regasification unit for vaporizing LNG.

The floating offshore structure according to this embodiment includes: a hull; A storage tank installed on the hull and storing LNG (Liquefied Natural Gas); A regasification unit installed on the hull and receiving LNG from the storage tank and vaporizing it; It is installed on the hull and generates power using LNG vaporized in the regasification unit as power generation fuel, and includes a power generation unit having a steam turbine driven by steam generated during power generation, and a heat source for vaporizing LNG in the regasification unit is Includes steam discharged from the steam turbine, and the amount of heat of the heat source supplied to the regasification unit may be configured to be adjustable.

The floating offshore structure according to the present embodiment may measure the temperature of LNG vaporized and discharged from the regasification unit, and adjust the amount of heat supplied to the regasification unit according to the measured temperature of the LNG. That is, the temperature of the heat supplied to the regasification unit can be adjusted according to the measured temperature of the LNG. Therefore, there may be an effect of vaporizing LNG in an optimal state.

1 is a view showing the configuration of a floating offshore structure according to a first embodiment of the present invention.
2 is a view showing the configuration of a floating offshore structure according to a second embodiment of the present invention.
3 is a view showing the configuration of a floating offshore structure according to a third embodiment of the present invention.

In the present specification, in adding reference numerals to elements of each drawing, it should be noted that only the same elements have the same number as possible, even if they are indicated on different drawings.

Meanwhile, the meaning of terms described in the present specification should be understood as follows.

Singular expressions should be understood as including plural expressions unless clearly defined differently in context, and terms such as “first” and “second” are used to distinguish one element from other elements, The scope of rights should not be limited by these terms.

It is to be understood that terms such as "comprise" or "have" do not preclude the presence or addition of one or more other features or numbers, steps, actions, components, parts, or combinations thereof.

The term “at least one” is to be understood as including all possible combinations from one or more related items. For example, the meaning of “at least one of the first item, the second item, and the third item” means 2 among the first item, the second item, and the third item as well as the first item, the second item, and the third item. It means a combination of all items that can be presented from more than one.

The term “and/or” is to be understood as including all possible combinations from one or more related items. For example, the meaning of “the first item, the second item and/or the third item” means two of the first item, the second item or the third item as well as the first item, the second item, or the third item. It means a combination of all items that can be presented from the above.

When a component is referred to as being "connected or installed" to another component, it should be understood that it may be directly connected or installed to the other component, but other components may exist in the middle. On the other hand, when a component is referred to as "directly connected or installed" to another component, it should be understood that there is no other component in the middle. On the other hand, other expressions describing the relationship between the constituent elements, that is, "between" and "directly between" or "adjacent to" and "directly adjacent to" should be interpreted as well.

Hereinafter, a floating offshore structure according to embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Embodiment 1

1 is a view showing the configuration of a floating offshore structure according to a first embodiment of the present invention.

As shown, the floating offshore structure according to the first embodiment of the present invention includes a hull 110, a storage tank 120, a regasification unit 130, a power generation unit 140, and a propulsion unit 180. I can.

The hull 110 may float on the surface by buoyancy, and the storage tank 120 may be installed on the hull 110 to store LNG (Liquefied Natural Gas). The storage tank 120 is preferably installed at the lower portion of the hull 110, and the LNG stored in the storage tank 120 is in a liquid state of about -160°C or less.

The regasification unit 130 may receive LNG from the storage tank 120 and vaporize the liquid LNG into a gaseous state. The regasification unit 130 may include a tank in which LNG is stored, a pump for discharging LNG from the tank, a carburetor for vaporizing LNG discharged from the tank, and the like. In addition, the regasification unit 130 may exchange heat with a relatively high temperature heat source in order to vaporize the liquid LNG.

The power generation unit 140 may be installed on the hull 110 and may generate power by using LNG stored in the storage tank 120 as power generation fuel. That is, the power generation unit 140 may generate power by using the LNG vaporized in the regasification unit 130 as power generation fuel.

The power generation unit 140 will be described.

The power generation unit 140 may include a gas turbine 151, a waste heat recovery boiler 153, a steam turbine 155, and a condenser 157.

The gas turbine 151 may be driven by combustion gas generated when the vaporized LNG supplied from the regasification unit 130 is combusted, and generates electricity while the generator 151a is driven by the gas turbine 151. The combustion gas driving the gas turbine 151 is discharged to the outside of the gas turbine 151, and the exhaust gas discharged from the gas turbine 151 may be introduced into the waste heat recovery boiler 153.

The waste heat recovery boiler 153 generates steam using the exhaust gas discharged from the gas turbine 151, and the steam turbine 155 is driven by the steam discharged from the waste heat recovery boiler 153. Then, the generator 155a generates power while the generator 155a is driven by the steam turbine 155.

The steam driving the steam turbine 155 is discharged, condensed in the condenser 157 and discharged, and the condensed water discharged from the condenser 157 may be re-inflowed into the waste heat recovery boiler 153.

The floating offshore structure according to the present embodiment burns vaporized LNG, drives the gas turbine 151 using combustion gas generated during the combustion of LNG, and drives the generator 151a by the gas turbine 151 It develops as a primary. And, the waste heat recovery boiler 153 generates steam by using the exhaust gas discharged from the gas turbine 151, the steam turbine 155 is driven by the steam generated by the waste heat recovery boiler 153, and the steam turbine By 155, the generator 155a generates secondary power. Therefore, the power generation efficiency can be improved.

As described above, the regasification unit 130 may exchange heat with a relatively high temperature heat source in order to vaporize the liquid LNG. Further, the floating offshore structure according to the first embodiment of the present invention may use steam discharged from the steam turbine 155 as a heat source for vaporizing LNG in the regasification unit 130.

In order to transfer heat of the steam discharged from the steam turbine 155 to the regasification unit 130, a first heat exchanger 161 may be installed to exchange heat with the steam discharged from the steam turbine 155. In addition, a heat exchange medium is introduced between the first heat exchanger 161 and the regasification unit 130 to circulate, and one side heat exchanges with the first heat exchanger 161 and the other side heat exchange with the regasification unit 130 A circulation pipe 163 may be installed. Then, since the heat of the steam discharged from the steam turbine 155 is transferred to the regasification unit 130 by the heat exchange medium circulating in the heat exchange medium circulation pipe 163, the regasification unit 130 is discharged from the steam turbine 155 LNG can be vaporized by using the resulting vapor as a heat source.

The first heat exchanger 161 exchanges heat with steam and at the same time exchanges heat with one side of the heat exchange medium circulation pipe 163, so it may be considered that the steam and the heat exchange medium exchange heat in the first heat exchanger 161.

The floating offshore structure according to the first embodiment of the present invention can control the temperature of heat supplied to the regasification unit 130.

In detail, a first temperature sensor 165a for sensing the temperature of vaporized LNG discharged from the regasification unit 130 to the power generation unit 140 may be installed, and the heat exchange medium circulation pipe 163 may have a first temperature. A first valve 165b may be installed to adjust the degree of opening and closing of the heat exchange medium circulation pipe 163 according to the temperature sensed by the sensor 165a.

Thus, when the degree of opening and closing of the heat exchange medium circulation pipe 163 is adjusted using the first valve 165b according to the temperature sensed by the first temperature sensor 165a, the heat exchange supplied to the regasification unit 130 The amount of medium can be adjusted. Then, since the amount of heat supplied to the regasification unit 130 is adjusted according to the amount of the heat exchange medium supplied to the regasification unit 130, the temperature of the heat supplied to the regasification unit 130 is controlled.

Reference numeral 180 in FIG. 1 is a propulsion unit for propelling the hull 110, and the propulsion unit 180 is a power device for rotating the propeller and a waste heat recovery boiler for recovering and generating waste heat generated from the power device. , It may include a steam turbine and a condenser.

The floating offshore structure according to the first embodiment of the present invention measures the temperature of LNG vaporized and discharged from the regasification unit 130, and the amount of heat exchange medium supplied to the regasification unit 130 according to the measured LNG temperature. Can be adjusted. That is, the temperature of heat supplied to the regasification unit 130 may be adjusted according to the measured temperature of the LNG. Therefore, it is possible to vaporize LNG in an optimal state.

Embodiment 2

2 is a view showing the configuration of a floating offshore structure according to a second embodiment of the present invention, and only differences from the first embodiment are described.

As shown, since a large amount of cooling water is required to condense the vapor of the condenser 257 of the power generation unit 240, seawater may be used as the cooling water.

At this time, after condensing the vapor of the condenser 257, if the temperature of seawater discharged from the condenser 257 is too high compared to the temperature of seawater in the ocean, the environment may be contaminated. Therefore, it is necessary to adjust the temperature of seawater discharged from the condenser 257 to have a deviation within the temperature of the seawater and the set value.

The temperature of seawater discharged from the condenser 257 may be controlled by exchanging heat with one side of the heat exchange medium circulation pipe 263.

In detail, a seawater pipe 271 for guiding seawater to pass through the condenser 257 may be provided, and a second heat exchange for heat exchange with a portion of the seawater pipe 271 through which seawater is discharged based on the condenser 257 The machine 273 may be provided.

And, based on the circulation direction of the heat exchange medium, among the portions of the heat exchange medium circulation pipe 263 from the regasification unit 230 to the first heat exchanger 261, the heat exchange medium circulation pipe 263 on the regasification unit 230 side One side of the heat exchange medium branch pipe 263a is branched, and the other side of the heat exchange medium branch pipe 263a may communicate with the heat exchange medium circulation pipe 263 on the first heat exchanger 261 side. Thus, the heat exchange medium branch conduit 263a may exchange heat with the second heat exchanger 273.

Since the second heat exchanger 273 heats the seawater pipe 271 and the heat exchange medium branch pipe 263a, it may be considered that the seawater and the heat exchange medium heat exchange in the second heat exchanger 273.

In addition, a second temperature sensor 275a for sensing the temperature of seawater heat-exchanged with the second heat exchanger 273 may be provided in the seawater conduit 271, and a second temperature sensor may be provided in the heat exchange medium branch conduit 263a. A second valve 275b may be installed to adjust the degree of opening and closing of the heat exchange medium branch pipe 263a according to the temperature sensed by the 275a. In this case, the first valve 265b may be installed in a portion of the heat exchange medium circulation pipe 263 between one side and the other side of the heat exchange medium branch pipe 263a.

Then, if the degree of opening/closing of the heat exchange medium branch pipe 273a is adjusted using the second valve 275b according to the temperature sensed by the second temperature sensor 275a, the heat exchange medium branch pipe 273a The amount of the cooled heat exchange medium flowing into the furnace can be adjusted. Then, the temperature of seawater discharged from the condenser 257 and introduced into the ocean may be controlled.

In the floating offshore structure according to the second embodiment of the present invention, after condensing the steam of the condenser 257, the temperature of seawater discharged from the condenser 257 is adjusted to have a deviation within the set value of the temperature of the seawater in the ocean. It can be adjusted so that environmental pollution can be prevented.

Third embodiment

3 is a diagram showing the configuration of a floating offshore structure according to a third embodiment of the present invention, and only differences from the first embodiment will be described.

As shown, the floating offshore structure according to the third embodiment of the present invention includes the first heat exchanger 361 and the condenser 357 for exchanging heat with the steam discharged from the steam turbine 355 of the power generation unit 340. A seawater pipe line 371 supplying seawater for condensing steam to the condenser 357, a second heat exchanger 373 and heat exchanger that exchange heat with the portion of the seawater pipe line 371 where seawater is discharged based on the condenser 357 A heat exchange medium circulation pipe 363 may be provided through which the medium is introduced and circulated, and heat exchange with the first heat exchanger 361, the regasifier 330, and the second heat exchanger 373.

In addition, according to the temperature detected by the first temperature sensor 365a and the first temperature sensor 365a for sensing the temperature of the vaporized LNG discharged from the regasification unit 330 to the power generation unit 340, the heat exchange medium circulation pipe ( In the first valve 365b that controls the degree of opening and closing of the 363, the second temperature sensor 375a and the second temperature sensor 375a sensing the temperature of the seawater that has exchanged heat with the second heat exchanger 373 A second valve 375b may be installed to adjust the degree of opening and closing of the heat exchange medium circulation pipe 363 according to the sensed temperature.

At this time, it is natural that the first valve 365b and the second valve 375b are installed in the heat exchange medium circulation pipe 363. Heat Exchange Medium Assuming that the heat exchange medium in the purification line 363 circulates in the order of the first heat exchanger 361 → regasifier 330 → the second heat exchanger 373 → the first heat exchanger 361 The first valve 365b may be installed in all parts of the heat exchange medium circulation pipe 363, but the second valve 375b is the heat exchange medium circulation pipe 363 between the regasifier 330 and the second heat exchanger 373. ) Is preferably installed.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and that various substitutions, modifications, and changes are possible within the scope of the technical spirit of the present invention. It will be obvious to those who have the knowledge of. Therefore, the scope of the present invention is indicated by the claims to be described later, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present invention.

110: hull
120: storage tank
130: regasification unit
140: development department

Claims (8)

hull;
A storage tank installed on the hull and storing LNG (Liquefied Natural Gas);
A regasification unit installed on the hull and receiving LNG from the storage tank and vaporizing it;
A gas turbine installed on the hull and driven by combustion gas generated when the LNG vaporized in the regasification unit is combusted, a waste heat recovery boiler that generates steam using exhaust gas discharged from the gas turbine, and the waste heat A power generation unit including a steam turbine that generates power by steam discharged from the recovery boiler, and a condenser for condensing the steam discharged from the steam turbine into seawater,
The heat source for vaporizing LNG in the regasification unit includes steam discharged from the steam turbine,
The amount of heat of the heat source supplied to the regasification unit is configured to be adjustable,
The power generation unit,
Further comprising a first heat exchanger for cooling the steam discharged from the steam turbine and introduced into the condenser with a heat exchange medium provided separately from the seawater,
The regasification unit,
A floating offshore structure characterized in that the LNG is vaporized using a heat exchange medium heated in the first heat exchanger. The method of claim 1,
A heat exchange medium circulation pipe is provided for supplying a heat exchange medium heat-exchanged with steam in the first heat exchanger to the regasification unit, and supplying a heat exchange medium heat exchanged with LNG in the regasification unit to the first heat exchanger,
A first temperature sensor for sensing the temperature of the vaporized gas discharged from the regasification unit to the power generation unit is installed,
A floating offshore structure, characterized in that a first valve is installed in the heat exchange medium circulation pipe to adjust the degree of opening and closing of the heat exchange medium circulation pipe according to the temperature detected by the first temperature sensor. The method of claim 2,
A floating offshore structure, characterized in that it further comprises a second heat exchanger for exchanging heat with the exhausted heat exchange medium after exchanging seawater with LNG in the regasification unit after heat exchange with steam in the condenser The method of claim 3,
A seawater pipe connected to the condenser and the second heat exchanger, respectively, and supplying seawater discharged after heat exchange with steam in the condenser to the second heat exchanger;
A heat exchange medium branch pipe branched at one side of the heat exchange medium circulation pipe and supplying the discharged heat exchange medium to the second heat exchanger after heat exchange with LNG in the regasification unit;
A second temperature sensor configured to sense a temperature of seawater discharged after heat exchange with the heat exchange medium in the second heat exchanger;
Floating offshore, characterized in that it further comprises a second valve that is installed in the heat exchange medium branch pipe and controls the degree of opening and closing of the heat exchange medium branch pipe according to the temperature sensed by the second temperature sensor. structure The method of claim 4,
The other side of the heat exchange medium branch pipe is connected to the heat exchange medium circulation pipe between one side of the heat exchange medium branch pipe and the first heat exchanger,
The first valve is a floating offshore structure, characterized in that installed in a portion of the heat exchange medium circulation pipe between one side and the other side of the heat exchange medium branch pipe. The method of claim 3,
Heat exchange by supplying a heat exchange medium heat-exchanged with steam in the first heat exchanger to the regasification unit, supplying a heat exchange medium heat exchanged with LNG in the regasification unit to the second heat exchanger, and heat exchange with seawater in the second heat exchanger A heat exchange medium circulation pipe for supplying the medium to the first heat exchanger is further provided,
A first temperature sensor for sensing the temperature of the vaporized gas discharged from the regasification unit to the power generation unit is installed,
A floating offshore structure, characterized in that a first valve is installed in the heat exchange medium circulation pipe to adjust the degree of opening and closing of the heat exchange medium circulation pipe according to the temperature detected by the first temperature sensor. The method of claim 6,
A second temperature sensor for sensing the temperature of seawater discharged after heat exchange with the heat exchange medium in the second heat exchanger is installed,
A floating offshore structure, characterized in that a second valve is installed in the heat exchange medium circulation pipe to adjust the degree of opening and closing of the heat exchange medium circulation pipe according to the temperature sensed by the second temperature sensor. The method of claim 7,
The first valve is installed in the heat exchange medium circulation pipe between the second heat exchanger and the first heat exchanger,
The second valve is a floating offshore structure, characterized in that installed in the heat exchange medium circulation pipe between the regasification unit and the second heat exchanger.

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