KR102239302B1 - 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 generates electricity by using waste heat discharged from the propulsion unit for moving the hull, and the desalination unit receives and uses electricity produced by the propulsion unit. Then, since there is no need to separately produce the energy required by the desalination unit, there may be an effect of reducing cost.

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 producing and supplying electricity required by a desalination unit by a propulsion unit.

Today, as part of interest in the environment, interest in eco-friendly power generation systems is increasing, and as a kind of eco-friendly power generation system, there is a power generation system that uses natural gas as power generation fuel.

However, in order to build a power generation system using natural gas as power generation fuel on land, infrastructure such as an LNG tank and gas supply system is required. It is difficult to build the power generation system to be used.

In order to solve the above problems, a power generation system is installed on a hull equipped with a device for storing and regasifying gas, and a floating offshore structure that transmits power to its own use place and land use place after power generation in the hull is developed. It has become and is being used.

A desalination device for desalination of seawater may be installed on the floating offshore structure. The desalination device generates steam by heating seawater, and generates fresh water by condensing the generated steam.

The desalination apparatus includes a compressor or a pump, and electricity is required to drive the compressor or the pump.

However, the conventional floating offshore structure has a disadvantage in that the cost increases because electricity to be supplied to the desalination device must be separately produced.

Prior art related to seawater desalination for ships is disclosed in Korean Patent Publication No. 10-2013-0131643 (December 04, 2013).

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 reducing cost by producing and supplying electricity required by a desalination unit for desalination of seawater by a propulsion unit for moving the hull.

The floating offshore structure according to this embodiment for achieving the above object includes: a hull; A propulsion unit installed on the hull having a power device that rotates a propeller for moving the hull and driven by combustion gas generated during combustion of the propulsion fuel, and a power generation unit that generates electricity using exhaust gas discharged from the power device; It is installed on the hull, has a compressor that generates superheated steam by compressing saturated steam, and includes a desalination unit that desalizes seawater, and electricity produced by the power generation unit may be supplied to the compressor.

The floating offshore structure according to this embodiment generates electricity by using waste heat discharged from the propulsion unit for moving the hull, and the desalination unit receives and uses electricity produced by the propulsion unit. Then, since there is no need to separately produce the energy required by the desalination unit, there may be an effect of reducing cost.

1 is a view showing the configuration of a floating offshore structure according to a first embodiment of the present invention.
Figure 2 is a view showing a specific configuration of the propulsion unit shown in Figure 1;
3A to 3B are diagrams showing a detailed configuration of the desalination unit shown in FIG. 1.
Figure 4 is a view showing the configuration of the main part of the floating offshore structure according to the second embodiment of the present invention.

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

Meanwhile, the meaning of the 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 "comprises" or "have" do not preclude the presence or addition of one or more other features, 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” is 2 of the first item, the second item, and the third item, as well as each 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 is to 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 the other component does not exist 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.

1 is a diagram showing the configuration of a floating offshore structure according to a first embodiment of the present invention, and FIG. 2 is a diagram showing a specific configuration of the propulsion unit shown in FIG. 1.

As shown, the floating offshore structure according to the first embodiment of the present invention includes a hull 110, a propulsion unit 120, an LNG tank 130, a regasification unit 140, and a power generation unit 150. I can.

The hull 110 can float on the water surface by buoyancy, and the propulsion unit 120 can be installed on the hull 110 to move the hull 110. A plurality of propulsion units 120 may be installed.

The propulsion unit 120 may include a power device 121 and a power generation unit 123.

The power unit 121 may be installed on the hull 110, and may rotate a propeller for moving the hull 110. The power unit 121 may be driven by combustion gas generated during combustion of a propulsion fuel such as gas or oil.

The power generation unit 123 may be installed on the hull 110 and may generate power by using exhaust gas discharged from the power device 121. The power generation unit 123 may include a first gas turbine 124, a first waste heat recovery boiler 125, a first steam turbine 126 and a first multiplexer 127.

The first gas turbine 124 can be driven by the exhaust gas discharged from the power unit 121, and generates electricity while the generator 128a is driven by the first gas turbine 124. Exhaust gas driving the first gas turbine 124 may be discharged and introduced into the first waste heat recovery boiler 125.

The first waste heat recovery boiler 125 may generate steam using exhaust gas discharged from the first gas turbine 124, and the first steam turbine 126 is discharged from the first waste heat recovery boiler 125. It can be driven by steam. Then, the other generator 128b is driven by the first steam turbine 126 to generate electricity.

The steam driven by the first steam turbine 126 is discharged and condensed in the first condenser 127 and discharged, and the condensed water discharged from the first condensed condenser 127 can be re-inflowed into the first waste heat recovery boiler 125. have.

Electricity produced by the power generation unit 123 of the propulsion unit 120 may be used in the floating offshore structure itself.

The LNG tank 130 may be installed on the hull 110 to store LNG (Liquefied Natural Gas). The LNG tank 130 is preferably installed at the lower portion of the hull 110, and the LNG stored in the LNG tank 130 is in a liquid state of approximately -160°C or less.

The regasification unit 140 is installed in the hull 110, and receives LNG from the LNG tank 130 to vaporize the liquid LNG into a gaseous state, and the NG (natural gas) vaporized in the regasification unit 140 May have a temperature of approximately room temperature. The regasification unit 140 may include a tank for storing LNG, a pump for discharging LNG from the tank, a carburetor for vaporizing LNG discharged from the tank, and the like.

The power generation unit 150 may be installed on the hull 110 and may generate power by using NG vaporized in the regasification unit 140 as power generation fuel.

The power generation unit 150 may include a second gas turbine 151, a second waste heat recovery boiler 153, a second steam turbine 155, and a second multiplexer 157.

The second gas turbine 151 may be driven by combustion gas generated when the vaporized NG supplied from the regasification unit 140 is combusted, and the generator 151a is driven by the second gas turbine 151. Develop. The combustion gas driving the second gas turbine 151 is discharged to the outside of the second gas turbine 151, and the exhaust gas discharged from the second gas turbine 151 is introduced into the second waste heat recovery boiler 153. I can.

The second waste heat recovery boiler 153 generates steam by using the exhaust gas discharged from the second gas turbine 151, and the second steam turbine 155 generates steam from the second waste heat recovery boiler 153. Driven by Then, another generator 155a is driven by the second steam turbine 155 to generate electricity.

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

Electricity generated by the power generation unit 150 may be supplied to a land use, and may be used in a floating offshore structure itself.

The floating offshore structure according to the first embodiment of the present invention drives the first gas turbine 124 and the second gas turbine 151 using exhaust gas and combustion gas, and 2 As the generators 128a and 151a are driven by the gas turbine 151, power is generated primarily. In addition, the first waste heat recovery boiler 125 and the second waste heat recovery boiler 153 generate steam by using the exhaust gas discharged from the first gas turbine 124 and the second gas turbine 151, and the first The first steam turbine 126 and the second steam turbine 155 are driven by the steam generated by the waste heat recovery boiler 125 and the second waste heat recovery boiler 153, and the first steam turbine 126 and the second The generators 128b and 155a generate secondary power by the steam turbine 155. Therefore, the power generation efficiency can be improved.

A desalination unit 200 for desalting seawater may be installed on the hull 110. The desalination unit 200 generates steam after heating seawater, and generates fresh water by condensing the generated steam.

In the desalination unit 200, seawater may be evaporated to desalize, and electricity is required to desalinate seawater. The floating offshore structure according to the first embodiment of the present invention can reduce cost by supplying and using electricity produced by the propulsion unit 120 to the desalination unit 200.

The desalination unit 200 will be described with reference to FIGS. 1 to 3C. 3A to 3B are diagrams showing a detailed configuration of the desalination unit shown in FIG. 1.

3A, the desalination unit 200 of the floating offshore structure according to the first embodiment of the present invention includes a compressor 210, an evaporator 220, a heat medium circulation pipe 230, and a first heat exchanger ( 241) to the fourth heat exchanger 247 may be included.

The compressor 210 may be driven by receiving electricity produced by the power generation unit 123, and may receive saturated steam and compress it at high pressure. When the saturated steam is compressed by the compressor 210, the temperature of the saturated steam also increases, and thus it may become superheated steam. Accordingly, superheated steam may be discharged from the compressor 210.

The evaporator 220 may evaporate the introduced seawater to generate steam and brine, and may generate condensed water and saturated steam by exchanging superheated steam and seawater.

In detail, when seawater and superheated steam flow into the evaporator 220, the relatively low temperature seawater and the relatively high temperature superheated steam exchange heat. Then, since seawater is heated, steam and brine are generated, and condensed water, which is steam and fresh water, is generated because superheated steam is cooled. Thus, the brine and condensed water of the evaporator 220 are discharged to the outside through separate pipes, and the steam becomes saturated steam and discharged to the compressor 220.

When relatively hot seawater is supplied to the evaporator 220, the seawater in the evaporator 220 can be easily vaporized.

To this end, as shown in FIGS. 3A and 3B, a heat medium circulation pipe 230 may be provided in which a heat medium such as water is introduced and circulates forming a closed loop, and the heat medium circulation pipe 230 The first heat exchanger 241 to the third heat exchanger 245 may be installed. At this time, the heat medium may circulate in the order of the first heat exchanger 241 → the second heat exchanger 243 → the third heat exchanger 245 → the first heat exchanger 241.

In the first heat exchanger 241, the exhaust gas and the heat medium discharged from the first waste heat recovery boiler 125 can exchange heat, and the heat medium passing through the first heat exchanger 241 is heated by the exhaust gas to be relatively high temperature. to be.

In the second heat exchanger 243, the heat medium and seawater heat-exchanged with the first heat exchanger 241 may exchange heat. Since the heat medium heat-exchanged with the first heat exchanger 241 is relatively high temperature, seawater heat-exchanged with the heat medium in the second heat exchanger 243 becomes relatively high temperature and may flow into the evaporator 220. Then, seawater introduced into the evaporator 220 can be easily vaporized.

Since the heat medium of the second heat exchanger 243 exchanges heat with the relatively low temperature seawater, the heat medium discharged from the second heat exchanger 243 is relatively low temperature.

In the third heat exchanger 245, the relatively low temperature heat medium that has passed through the second heat exchanger 243 and the relatively stagnant condensed water discharged from the evaporator 220 may exchange heat. Then, the condensed water discharged from the third heat exchanger 245 can be cooled and discharged as fresh water, and the heat medium discharged from the third heat exchanger 245 becomes relatively high temperature and flows into the first heat exchanger 241. I can.

If the relatively hot seawater is supplied to the second heat exchanger 243, energy for heating the seawater in the second heat exchanger 243 may be saved.

Seawater may be heated using relatively hot brine discharged from the evaporator 220 and then supplied to the second heat exchanger 243. To this end, as shown in FIGS. 3A to 3C, a fourth heat exchanger 247 may be provided, and in the fourth heat exchanger 247, salt water discharged from the evaporator 220 and seawater may exchange heat. . The brine of the fourth heat exchanger 247 may be cooled and discharged after heat exchange with seawater, and the seawater of the fourth heat exchanger 247 may be introduced into the second heat exchanger 243.

The floating offshore structure according to the first embodiment of the present invention generates electricity by using waste heat from the power generation unit 123 of the propulsion unit 120, and the compressor 210 of the desalination unit 200 is the propulsion unit 120 ) And use the electricity produced. Then, there is no need to separately produce energy for driving the compressor 210 of the desalination unit 200.

There is also a reverse osmosis method for desalination of seawater. The reverse osmosis method is a method of producing fresh water by pressurizing seawater at high pressure, and a high pressure pump is required. In this case, electricity produced by the propulsion unit 120 may be used as energy for driving the high-pressure pump.

4 is a view showing a configuration of a main part of a floating offshore structure according to a second embodiment of the present invention, and only differences from the first embodiment will be described.

As shown, the floating offshore structure according to the second embodiment of the present invention can heat-exchange steam and seawater with the first recuperator 127 of the propulsion unit 120, and then supply the seawater to the desalination unit 200. have. Then, the relatively higher temperature seawater can be supplied to the desalination unit 200.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and 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: propulsion unit
121: power unit
123: power generation unit
200: desalination unit
210: compressor

Claims (5)

hull;
A propulsion unit installed in the hull having a power device that rotates a propeller for moving the hull and driven by combustion gas generated during combustion of the propulsion fuel, and a power generation unit that generates electricity using exhaust gas discharged from the power device;
An LNG tank installed on the hull to store LNG;
A regasification unit installed on the hull and receiving LNG from the LNG tank and vaporizing it into a gaseous state;
A power generation unit that generates power by using NG supplied from the regasification unit as power generation fuel and transmits it to a land use; And
It is installed on the hull, has a compressor for generating superheated steam by compressing saturated steam, and includes a desalination unit for desalination of seawater,
The desalination unit,
A floating offshore structure, characterized in that when the propulsion unit moving the hull is operated, the compressor is operated using electricity produced by the propulsion unit and the seawater is heated by using waste heat of exhaust gas discharged from the propulsion unit. . The method of claim 1,
The power generation unit,
A first gas turbine that is driven by exhaust gas discharged from the power device and drives a generator,
A first waste heat recovery boiler that generates steam using exhaust gas discharged from the first gas turbine;
A first steam turbine driven by steam generated by the first waste heat recovery boiler and for driving generators other than the generator driven by the first gas turbine;
Floating offshore structure, characterized in that it comprises a first plurality of units for condensing the steam discharged from the first steam turbine. The method of claim 2,
The desalination unit,
An evaporator for generating brine, saturated steam and condensed water by heat exchange between seawater and superheated steam, and supplying saturated steam to the compressor when seawater is introduced and superheated steam is introduced from the compressor;
A heat medium circulation pipe in which a heat medium is introduced and circulates in a closed loop;
A first heat exchanger installed in the heat medium circulation pipe and for exchanging heat between the exhaust gas discharged from the first waste heat recovery boiler and the heat medium;
A second heat exchanger installed in the heat medium circulation pipe, the heat medium heat-exchanged with seawater and the first heat exchanger, and supplying the heat-exchanged seawater to the evaporator;
A floating offshore structure, characterized in that it further comprises a third heat exchanger installed in the heat medium circulation pipe and configured to exchange heat between the condensed water discharged from the evaporator and the heat medium heat-exchanged with the second heat exchanger. The method of claim 3,
The desalination unit,
A floating offshore structure, characterized in that it further comprises a fourth heat exchanger for heat-exchanging the brine and seawater discharged from the evaporator and supplying it to the second heat exchanger. The method of claim 4,
Seawater is a floating offshore structure, characterized in that after heat exchange with the steam of the first recuperator and then supplied to the fourth heat exchanger.

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