KR20140053509A - Electricity generation system using ocean thermal energy conversion and heated air from wind power generator - Google Patents

Abstract

Disclosed is a power generation system using seawater temperature differences caused by heating air of a wind power generator. The power generation system using seawater temperature differences caused by heating air of a wind power generator includes: a heat exchanger for cooling the inside and gasifying a working fluid using heated air; a power generator unit for using the gasified working fluid to generate power; and a condenser for rotating the turbine of the power generator unit and heat-exchanging the working fluid with seawater.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a seawater temperature difference generation system using heated air of a wind turbine generator,

The present invention relates to a seawater temperature difference power generation system using heated air of a wind power generator, and more particularly, to a system for cooling a wind power generator and using heated air to vaporize a working fluid or to increase the enthalpy of a surface- To a seawater temperature difference power generation system using heated air of a wind power generator that produces electricity by generating seawater temperature difference power.

Wind power is a pollution-free, unlimited source of energy naturally occurring on Earth. As the economic development of developing and less developed countries is actively promoted, fossil fuels that have been used as major energy sources have been depleted. As interest in the environment has increased, research and development on sustainable development and pollution-free energy sources are steadily being carried out . As a result, wind power generation has attracted attention.

Wind power generation is commercialized as a technology for installing support structures on the land and sea, and installing wind power generators on such support structures.

Land-based wind power generation has difficulties in securing land in Korea where there are not many plains, and installing wind power generators in mountainous areas requires a lot of construction costs for roads and transmission lines, and maintenance is difficult. For this reason, interest in offshore wind power generation is increasing recently.

Offshore wind power generation can be divided into fixed type and floating type. In fixed type, foundation is constructed on the bottom of shallow sea, wind power generation facility is installed after the structure is installed on it, and floating type float on the sea surface And installing wind power generation facilities thereon.

The wind power generation facility consists largely of a blade rotating by wind power, a tower providing a height for securing a rotating space of the blade, a power generation section generating power by the rotational force of the blade, and a Nacelle corresponding to the case of the power generation section.

Since the inside of the nacelle is heated by the power generation part, it can supply air to cool it. The air supplied into the nacelle is heated while cooling the power generating devices of the power generation unit, and the temperature can be a considerably high temperature of 50 to 70 ° C.

The present invention proposes a system for utilizing the thermal energy of such a high temperature air to further increase the power generation amount of the wind power generation system.

According to an aspect of the present invention, in the seawater temperature difference generation system,

A heat exchanger that cools the interior of the wind turbine and vaporizes the working fluid with heated air;

A power generator that generates power by rotating the turbine with the working fluid vaporized in the heat exchanger; And

There is provided a seawater temperature difference power generation system using heated air of a wind power generator including a turbine rotating in the power generation section and a condenser for liquefying the working fluid discharged from the turbine by heat exchange with seawater.

A heated air supply pipe for supplying the heated air from the wind turbine generator to the heat exchanger and a blower for blowing the heated air from the wind turbine generator to the heat exchanger, And can be heated while cooling.

And a solar heating unit provided between the heat exchanger and the power generation unit for heating the working fluid with solar heat, wherein the solar heating unit includes a pressurizing pump for increasing the pressure of the supplied fluid, A solar heat exchanger for heating the fluid to generate a superheated fluid, and a solar heat exchanger for receiving the superheated fluid generated in the solar heaters to heat the working fluid.

The solar heating unit may further include a storage tank provided at a rear end of the solar heating unit and a bypass pipe bypassing the storage tank to supply the superheated fluid to the solar heat exchanger.

And a circulation pump for sending the working fluid liquefied in the condenser to the heat exchanger.

According to another aspect of the present invention, in a seawater temperature difference power generation system,

A vaporizer for vaporizing the working fluid with surface water;

A heating air heat exchanger that cools the interior of the wind turbine and receives heated air to heat the working fluid vaporized in the vaporizer to increase enthalpy;

A power generator that receives the working fluid from the heated air heat exchanger and generates power by rotating the turbine; And

There is provided a seawater temperature difference power generation system using heated air of a wind power generator including a turbine rotating in the power generation section and a condenser for liquefying the working fluid discharged from the turbine by heat exchange with seawater.

A heated air supply pipe for supplying the heated air from the wind turbine generator to the heated air heat exchanger and a blower for blowing the heated air from the wind turbine generator to the heated air heat exchanger, Can be heated while cooling the nacelle inside.

And a solar heating unit provided between the heating air heat exchanger and the power generation unit for heating the working fluid with solar heat, wherein the solar heating unit includes a pressurizing pump for increasing the pressure of the supplied fluid, And a solar heat exchanger for heating the pressurized fluid to generate a superheated fluid, and a solar heat exchanger for receiving the superheated fluid generated by the solar heaters to heat the working fluid.

The solar heating unit may further include a storage tank provided at a rear end of the solar heating unit and a bypass pipe bypassing the storage tank to supply the superheated fluid to the solar heat exchanger.

And a circulation pump for sending the working fluid liquefied in the condenser to the vaporizer.

According to another aspect of the present invention, in the method for generating a sea water temperature difference,

1) cooling the interior of the wind turbine and vaporizing the working fluid with heated air, or increasing the enthalpy of the working fluid vaporized from the surface water as a heat source;

2) generating power by rotating the turbine with the working fluid vaporized; And

3) rotating the turbine and exchanging the discharged working fluid with seawater for heat exchange,

Wherein the air is heated while cooling the nacelle of the wind turbine in the step 1).

Between the step 1) and the step 2)

1-a) heating the pressurized fluid to pressurize the fluid, collect solar heat, and heat the vaporized working fluid with the superheated fluid formed by heating the pressurized fluid.

The present invention provides a seawater temperature difference generation system using the heated air of the present invention for cooling the inside of a wind turbine and using heated air to vaporize a working fluid or increase the enthalpy of a working fluid vaporized from a surface water as a heat source, The power generation amount of the wind power generation system can be increased.

1 schematically shows a first embodiment of a seawater temperature difference power generation system using heated air of a wind turbine provided with a heat exchanger for cooling the inside of a wind turbine and vaporizing a working fluid with heated air as an embodiment of the present invention .
Fig. 2 schematically shows a second embodiment in which a solar heating unit for further heating a working fluid with solar heat is added to the first embodiment of the present invention.
FIG. 3 is a schematic view showing another embodiment of the present invention. As shown in FIG. 3, the wind turbine is provided with a heating air heat exchanger for heating the working fluid as surface water, cooling the interior of the wind turbine, heating the evaporated working fluid, And schematically shows a third embodiment of a seawater temperature difference power generation system using heated air of a generator.
Fig. 4 schematically shows a fourth embodiment in which a solar heating unit for further heating a working fluid with solar heat is added to the third embodiment of the present invention.

In order to fully understand the present invention, operational advantages of the present invention, and objects achieved by the practice of the present invention, reference should be made to the accompanying drawings and the accompanying drawings which illustrate preferred embodiments of the present invention.

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

FIG. 1 is a schematic diagram of a seawater temperature difference power generation system (hereinafter, referred to as " system ") using heated air of a wind power generator WP provided with a heat exchanger 100 for cooling the inside of a wind turbine Fig. 2 schematically shows a second embodiment in which a solar heating unit 500 for additionally heating a working fluid by solar heat is added to the first embodiment of the present invention.

As shown in FIG. 1, in the seawater temperature difference power generation system using the heated air of the wind turbine (WP) according to an embodiment of the present invention, in the sea water temperature difference power generation system, A generator 200 for generating electricity by rotating the turbine with the working fluid vaporized in the heat exchanger 100, an operation for rotating the turbine in the generator 200, And a condenser 300 for liquefying the fluid by heat exchange with seawater.

This embodiment includes a heating air supply pipe AL for supplying air heated by the wind power generator WP to the heat exchanger 100 and a blower fan for blowing the heated air from the wind turbine WP to the heat exchanger 100. [ And the heated air can be heated while cooling the inside of the nacelle N of the wind power generator WP.

In the nose cell N of the wind power generator WP, power generating devices for converting the rotational force of the wing into electric energy are provided. Generating apparatus generates heat in the process of converting kinetic energy due to rotational force into electrical energy, and circulates external air to the inside of the nacelle (N) in order to prevent the inside of the nacelle (N) from being heated excessively.

The temperature of the air supplied to cool the inside of the nacelle N reaches a temperature of 50 to 70 ° C. This embodiment supplies the heated air to the heat exchanger 100 to vaporize the working fluid of the seawater temperature difference power generation system As a heat source.

The working fluid is vaporized in the heat exchanger 100 by the air supplied from the nucelle N of the wind turbine WP and the vaporized working fluid drives the generator by the rotation of the turbine in the generator 200, Production. The rotating working fluid and the discharged working fluid in the turbine are liquefied in the condenser 300 by seawater, in particular, low temperature deep water and circulated to the heat exchanger 100 along the piping.

In the present embodiment and the second, third and fourth embodiments to be described later, a low boiling point substance such as ammonia, propane, butane, furon and the like can be selected as the refrigerant. The refrigerant having a low boiling point may be vaporized from the air supplied from the nucelle N of the wind power generator WP or the surface water in the third and fourth embodiments described later as a heat source. When a refrigerant having a higher boiling point is used as a working fluid, the boiling point of the refrigerant can be lowered by setting the inside of the heat exchanger 100, 100a or the vaporizer 110, 110c to a low pressure state.

2, the second embodiment of the present invention further includes a solar heating unit 500 provided between the heat exchanger 100a and the power generation unit 200a to heat the working fluid with solar heat, in addition to the configuration of the first embodiment The solar heating unit 500 further includes a pressurizing pump 510 for increasing the pressure of the supplied fluid, a solar heat collecting unit for collecting the solar heat and heating the pressurized fluid from the pressurizing pump 510 to generate a superheated fluid, A heater 520 and a solar heat exchanger 530 that receives the superheated fluid generated by the solar heaters 520 and heats the working fluid.

In the second embodiment, a solar heating unit 500 is further added to the seawater temperature difference power generation system of the first embodiment to further heat the working fluid by solar heat to increase enthalpy of the working fluid.

The superheated fluid described in this embodiment is used as a concept including a superheated gas and a superheated liquid. Here, superheated liquid refers to a liquid that maintains a liquid state without being vaporized even when the temperature reaches a boiling point or more as the external pressure rises.

This is based on the following principle.

Boyle-Charles' Law defines Bohr's law that the gas pressure is inversely proportional to the volume when the temperature is constant, and Charles's law that the volume of the gas is proportional to the increase in temperature when the pressure is constant And the relationship between temperature, pressure, and volume at the same time.

This is expressed by the following equation.

In the above equation, k is constant.

Therefore, in order to satisfy the above equation, it can be seen that when the pressure rises, the corresponding temperature must also rise.

The boiling point of the liquid is the temperature at which the internal pressure and the external pressure of the gas generated as the liquid evaporates, and when applied to the above equation, it is concluded that the boiling point of the liquid should rise when the external pressure rises .

The present invention utilizes the boiling point ascending principle by such a pressure rise. That is, the boiling point of the fluid is increased by raising the pressure through the pressurizing pump 510, and the fluid is heated by the solar heat to form the superheated fluid heated to the original boiling point or more and then heat-exchanged with the vaporized refrigerant.

The vapor of the vaporized refrigerant, that is, the refrigerant, is increased in heat through heat exchange and can be converted to superheated steam. Here, the superheated steam is as follows. When the liquid is heated under a constant pressure, the temperature rises. When it reaches a certain temperature, it begins to evaporate. Even if it is heated again, the temperature does not change until all the liquid evaporates. This is referred to as wet saturated steam, and all of which is phase-changed by steam is referred to as dry saturated steam. When the dry saturated steam is heated again, the temperature of the steam rises, which is called superheated steam, and the difference between the superheated steam temperature and the saturated steam temperature is called superheated steam.

Here, dryness refers to the weight ratio of dry saturated steam in the wetted steam. The dryness shows the relationship between latent heat capacity and enthalpy.

By using such superheated steam, the output of the turbine, etc. can be increased.

On the other hand, the degree of the pressure rise by the pressure pump 510 can be determined in consideration of the desired boiling point rise effect, and can be selected from pressures below the critical point of the introduced fluid.

For example, when the introduced fluid is water, the critical point is 225.56 kgf / cm 2 and 374.15 ° C, and high temperature water up to about 370 ° C can be formed using the pressurization pump 510 and the solar heaters 520 of the present embodiment. When this embodiment is applied to a wind turbine (WP) mounted on the sea, seawater which can be easily taken out can be pressurized by a pressurizing pump 510 and introduced into the solar heaters 520, and the molar concentration of seawater It will be possible to generate a superheated fluid, that is, high temperature water.

The solar heating unit 500 includes a storage tank 540 provided at the rear end of the solar heating unit 520 and a bypass pipe 550 through which the superheating fluid is supplied to the solar heat exchanger 530 by bypassing the storage tank 540 ). ≪ / RTI >

A storage tank 540 is provided to supply the superheating fluid to the solar heat exchanger 530 through the bypass pipe 550 when the solar heaters 520 can be operated, When it is difficult to generate the superheated fluid, the superheated fluid stored in the storage tank 540 is supplied to the solar heat exchanger 530 to continuously drive the system regardless of the season or the like.

The first and second embodiments may further include circulation pumps 400 and 400a for delivering the liquefied working fluid from the condensers 300 and 300c to the heat exchangers 100 and 100a.

FIG. 3 illustrates another embodiment of the present invention. As shown in FIG. 3, after heating a working fluid with surface water, the interior of the wind turbine WP is cooled and heated air is supplied. 4 schematically shows a third embodiment of a seawater temperature difference power generation system using heated air of a wind power generator WP provided with a heater 120. Fig. The solar heating unit 500c is added to the first embodiment.

3, the sea water temperature difference generation system using the heated air of the wind turbine (WP) according to another embodiment of the present invention includes a vaporizer 110 for vaporizing a working fluid as surface water, A heating air heat exchanger 120 that heats the inside of the wind turbine WP and receives the heated air and heats the working fluid vaporized in the vaporizer 110 to increase the enthalpy; And a condenser 300b for rotating the turbine in the power generator 200b and exchanging the working fluid with the seawater by heat exchange with the condenser 300b.

The surface water formed in the upper part of the seawater indicates a temperature of about 20 ° C or more, and in a low latitude region such as a tropical region, it is about 30 ° C, so that it can be a heat source for vaporizing a working fluid having a low boiling point as described above. In this embodiment, the working fluid is vaporized by the surface water, the interior of the wind turbine WP is cooled, and the heated air is supplied to the heating air heat exchanger 120 to increase the enthalpy of the working fluid, Can be increased.

This embodiment includes a heating air supply line AL for supplying air heated by the wind power generator WP to the heating air heat exchanger 120 and a heating air supply line AL for supplying the heated air from the wind power generator WP to the heating air heat exchanger 120 The blower further includes a blowing blower, wherein the heated air can be heated while cooling the inside of the nucelle N of the wind power generator WP.

That is, the working fluid is vaporized by surface water and the heated air in the nacelle N of the wind turbine (WP) is sent to the heating air heat exchanger (120) through the heated air supply pipe (AL) (200b). In the power generation unit 200b, the working fluid is generated by rotating the turbine to drive the generator, and the discharged working fluid is circulated in the condenser 300b to the vaporizer 110 through heat exchange with seawater, especially deep water.

4, in addition to the configuration of the third embodiment, the fourth embodiment of the present invention further includes a solar heating unit (not shown) provided between the heating air heat exchanger 120c and the power generating unit 200c to heat the working fluid with solar heat, The solar heating unit 500c includes a pressurizing pump 510c for increasing the pressure of the supplied fluid, a heat pump 500c for collecting solar heat and heating the pressurized fluid from the pressurizing pump 510c to generate a superheated fluid And a solar heat exchanger 530c that receives the superheated fluid generated by the solar heaters 520c and heats the working fluid.

In the fourth embodiment, the solar heating unit 500c includes a storage tank 540c provided at the rear end of the solar heat heater 520c, and a solar heat exchanger 530c bypassing the storage tank 540c to supply the superheated fluid to the solar heat exchanger 530c And may further include a bypass pipe 550c.

In the fourth embodiment, the working fluid is vaporized by surface water and the enthalpy is increased by heating the working fluid with the air supplied from the nucelle N of the wind turbine WP. Then, the enthalpy of the working fluid is again supplied to the solar heating unit 500c So that the output of the power generation unit 200c such as a turbine is increased, and the construction and operation principle of the solar heating unit 500c are the same as those of the second embodiment. A duplicate description thereof will be omitted.

The third and fourth embodiments may further include circulation pumps 400b and 400c for delivering the liquefied working fluid to the carburettors 110 and 110c in the condensers 300b and 300c.

According to another aspect of the present invention, in the method for generating a sea water temperature difference,

1) cooling the interior of the wind turbine (WP) and vaporizing the working fluid with heated air or increasing the enthalpy of the working fluid vaporized from the surface water as a heat source;

2) generating power by rotating the turbine with the vaporized working fluid; And

3) rotating the turbine and heat exchanging the discharged working fluid with seawater to condense it,

Wherein the air is heated while cooling the nacelle (N) of the wind turbine (WP) in step 1).

Between step 1) and step 2) described above, it may further include 1-a) heating the working fluid vaporized with the superheated fluid formed by pressurizing the fluid and collecting solar heat to heat the pressurized fluid .

As described above, the seawater temperature difference power generation system using the heated air of the wind power generator (WP) according to the present embodiments cools the interior of the wind turbine (WP), that is, the nacelle (N) Or to increase the enthalpy of the vaporized working fluid to make the seawater temperature difference development.

By applying this embodiment to a wind power generation system, it is possible to cool the inside of the nacelle (N) and utilize the heat energy of the heated hot air without throwing away, thereby increasing the energy efficiency of the wind power generation system, . In addition, the present embodiment suggests a system capable of efficiently generating electricity by combining eco-friendly wind power, seawater temperature difference power generation, and solar power generation.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention. Accordingly, such modifications or variations are intended to fall within the scope of the appended claims.

WP: Wind generator
N: Nussel
T: Tower
AL: Heating air supply pipe
100, 100a: heat exchanger
110, 110c: vaporizer
120, 120c: Heating air heat exchanger
200, 200a, 200b, 200c:
300, 300a, 300b, 300c: condenser
400, 400a, 400b, 400c: circulation pump
500, 500c: solar heating unit
510, 510c: pressure pump
520, 520c: solar heaters
530, 530c: Solar heat exchanger
540, 540c: Storage tank
550, 550c: Bypass piping

Claims (12)

In a seawater temperature difference power generation system,
A heat exchanger that cools the interior of the wind turbine and vaporizes the working fluid with heated air;
A power generator that generates power by rotating the turbine with the working fluid vaporized in the heat exchanger; And
And a condenser for rotating the turbine in the power generation unit and liquefying the working fluid discharged from the power generation unit by heat exchange with the seawater. The method according to claim 1,
A heated air supply pipe for supplying air heated by the wind power generator to the heat exchanger; And
Further comprising a blower for blowing the heated air from the wind power generator to the heat exchanger,
Wherein the heated air is heated while cooling the inside of the nacelle of the wind turbine generator. The method according to claim 1,
Further comprising a solar heating unit provided between the heat exchanger and the power generation unit for heating the working fluid with solar heat,
A pressurizing pump for increasing the pressure of the supplied fluid;
A solar heater for collecting solar heat and heating the pressurized fluid in the pressurizing pump to generate a superheated fluid; And
And a solar heat exchanger for receiving the superheated fluid generated by the solar heaters and heating the working fluid. The solar heating apparatus according to claim 3, wherein the solar heating unit
A storage tank provided at a rear end of the solar heaters; And
And a bypass pipe through which the superheating fluid is supplied to the solar heat exchanger by bypassing the storage tank. The method according to claim 1,
And a circulation pump for sending the working fluid liquefied in the condenser to the heat exchanger. In a seawater temperature difference power generation system,
A vaporizer for vaporizing the working fluid with surface water;
A heating air heat exchanger that cools the interior of the wind turbine and receives heated air to heat the working fluid vaporized in the vaporizer to increase enthalpy;
A power generator that receives the working fluid from the heated air heat exchanger and generates power by rotating the turbine; And
And a condenser for rotating the turbine in the power generation unit and liquefying the working fluid discharged from the power generation unit by heat exchange with the seawater. The method according to claim 6,
A heated air supply pipe for supplying air heated by the wind power generator to the heated air heat exchanger; And
Further comprising a blower for blowing the heated air from the wind power generator to the heated air heat exchanger,
Wherein the heated air is heated while cooling the inside of the nacelle of the wind turbine generator. The method according to claim 6,
Further comprising a solar heating unit provided between the heating air heat exchanger and the power generation unit for heating the working fluid with solar heat,
A pressurizing pump for increasing the pressure of the supplied fluid;
A solar heater for collecting solar heat and heating the pressurized fluid in the pressurizing pump to generate a superheated fluid; And
And a solar heat exchanger that receives the superheated fluid generated by the solar heaters and heats the working fluid. The solar heating apparatus according to claim 8, wherein the solar heating unit
A storage tank provided at a rear end of the solar heaters; And
And a bypass pipe through which the superheating fluid is supplied to the solar heat exchanger by bypassing the storage tank. The method according to claim 6,
And a circulation pump for sending the working fluid liquefied in the condenser to the vaporizer. In the seawater temperature difference generation method,
1) cooling the interior of the wind turbine and vaporizing the working fluid with heated air, or increasing the enthalpy of the working fluid vaporized from the surface water as a heat source;
2) generating power by rotating the turbine with the working fluid vaporized; And
3) rotating the turbine and exchanging the discharged working fluid with seawater for heat exchange,
Wherein the air is heated while cooling the nacelle of the wind turbine in the step 1). 12. The method according to claim 11, wherein between step 1) and step 2)
1-a) heating the working fluid vaporized by the superheated fluid formed by pressurizing the fluid, heating the pressurized fluid by collecting solar heat, and heating the working fluid.

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