KR102513013B1 - Energy-independent solar power generating system - Google Patents

Abstract

An energy-independent solar power generation system is disclosed. The energy-independent solar power generation system comprises: a solar power generation and heat collection unit configured to convert light energy of the sun into electrical energy and thermal energy; a hot water storage unit configured to store hot water obtained by recovering the thermal energy; and a steam power generation unit configured to generate electricity by using a (1-1) working fluid subjected to heat exchange with the hot water stored in the hot water storage unit.

Description

Energy-independent solar power generating system {Energy-independent solar power generating system}

An energy self-sufficient solar power generation system is disclosed. More specifically, an energy self-sufficient photovoltaic power generation system capable of self-producing power and utilizing it as renewable energy is disclosed.

Currently, a system that obliges power generation companies to supply a certain percentage of total power generation as new and renewable energy according to the new and renewable energy supply expansion policy, that is, the 'Renewable Portfolio Standard (RPS)' is being implemented. Accordingly, the target companies selected as power generation operators with a power generation facility capacity of 500MW or more must supply 2% of power generation annually as a new and renewable energy source. It is currently necessary to purchase a certificate (REC-generation amount) to meet the mandatory quota.

Therefore, research on power generation systems using renewable energy, such as solar or wind power, is being conducted. Research on how to use it is ongoing.

For example, Korean Patent Registration No. 10-0776353 discloses that when surplus power greater than the demand is generated among the electricity generated from 　 renewable energy 　 power generation facilities such as solar cells and wind power generation, hydrogen is produced and stored using 　 photovoltaic power generation device, and then the amount of power generated An energy self-sufficient system using hydrogen energy that enables generation and supply of electricity from a fuel cell using stored hydrogen is disclosed. However, the energy self-sufficient system utilizes only surplus electrical energy, and the fuel cell used is a low-temperature fuel cell operating at 60 to 70°C.

On the other hand, surplus heat may be generated in various industrial facilities, and surplus heat is generated using various wastes discharged from industrial sites and living sites. A technology to utilize it as a heat source is being developed, but its utilization is limited. .

One embodiment of the present invention provides an energy-independent photovoltaic power generation system capable of self-producing power and utilizing it as renewable energy.

One aspect of the present invention is,

a photovoltaic power generation and heat collection unit configured to convert sunlight energy into electrical energy and thermal energy;

a hot water storage unit configured to store hot water obtained by recovering the thermal energy;

a steam power generation unit configured to generate electricity using the 1-1 working fluid that has undergone heat exchange with the hot water stored in the hot water storage unit;
As an evaporation unit, the 1-1 working fluid passes through the steam power generation unit and is converted into a 1-2 working fluid, and the 1-2 working fluid evaporates a separate second working fluid by heat exchange to An evaporation unit configured to convert the second working fluid into a 1-3 working fluid, and the 1-3 working fluid passing through the hot water storage unit to produce the 1-1 working fluid supplied to the steam power generation unit. ; and
The 1-2 working fluid discharged from the steam power generation unit passes through the evaporation unit and is converted into the 1-4 working fluid, and the 1-4 working fluid is compressed to produce the 1-5 working fluid. comprising a compression unit configured;
The first to fifth working fluids heat the hot water stored in the hot water storage unit by heat exchange and then convert to the first to sixth working fluids.

The photovoltaic power generation and heat collection unit includes a photovoltaic power generation and heat collection panel, an inverter configured to convert DC electricity generated by the photovoltaic power generation and heat collection panel into alternating current electricity, and the photovoltaic power generation and heat collection panel. It may include a heat exchanger configured to recover the generated heat as hot water.

The energy self-sufficient photovoltaic power generation system may further include a preheater between the photovoltaic power generation and heat collection unit and the hot water storage unit.

delete

delete

The energy-independent photovoltaic power generation system is configured to condense the 1-6 working fluids heat-exchanged with the hot water after passing through the compression unit by heat exchange with the 3rd working fluid to convert them into 1-7 working fluids. A condensation unit may be further included.

delete

The energy-independent photovoltaic power generation system may further include an expansion unit configured to expand the first to seventh working fluids discharged from the condensation unit to produce the second working fluid supplied to the evaporation unit.

The third working fluid supplied to the condensation unit may be maintained at a lower temperature than the first to sixth working fluids supplied to the condensation unit by geothermal heat.

The energy-independent photovoltaic power generation system may further include a working fluid transport line configured to raise the third working fluid from the ground to the ground, pass through the condensing unit, and then send the third working fluid down to the ground.

The working fluid transfer line may include an insulating part positioned above and above the ground, and a heat conduction part positioned below the ground.

The hot water stored in the hot water storage unit may be maintained at a temperature of 60 to 70°C, and the heat conducting portion of the working fluid transfer line may be maintained at a temperature of 15 to 17°C.

The steam power unit may include a turbine and an alternator connected thereto.

The energy self-sufficient photovoltaic power generation system may further include an energy storage unit configured to store electricity generated by the steam power generation unit.

The energy self-sufficient photovoltaic power generation system may be configured to use electricity generated by the steam power generation unit alone or together with external power as input power for the photovoltaic power generation and heat collection unit.
At least one of the 1-1 working fluid to the 1-7 working fluid, the second working fluid, and the third working fluid may include an HFC-based working fluid.

delete

The energy self-sufficient photovoltaic power generation system according to one embodiment of the present invention can produce power itself and use it as new and renewable energy, thereby reducing power costs as well as appropriately coping with the new and renewable energy mandatory quota system.

1 is a diagram schematically showing an energy independent photovoltaic power generation system according to an embodiment of the present invention.

Hereinafter, an energy independent photovoltaic power generation system according to an embodiment of the present invention will be described in detail with reference to the drawings.

In the present specification, “upper” means a reverse direction of gravity, and “lower” means a direction of gravity.

Also, in this specification, “working fluid” is a fluid that operates a steam power generation unit, and means a liquid, a gas, a mixture of a liquid and a gas, or a combination thereof.

Also, in this specification, “electricity” and “power” are used in the same meaning.

1 is a diagram schematically showing an energy independent photovoltaic power generation system 100 according to an embodiment of the present invention.

An energy self-sufficient photovoltaic power generation system 100 according to an embodiment of the present invention includes a photovoltaic power generation and heat collection unit 110, a hot water storage unit 120, and a steam power generation unit 130.

The photovoltaic power generation and heat collection unit 110 may be configured to convert light energy from the sun into electrical energy and thermal energy.

The photovoltaic power generation and heat collection unit 110 may include a photovoltaic power generation and heat collection panel 111 , an inverter 112 and a heat exchanger 113 .

The photovoltaic power generation and heat collection panel 111 may be configured to generate electrical energy and thermal energy by absorbing light energy from the sun. For example, solar power and heat collection panel 111, although not specifically shown in FIG. It may have a configuration of a built-in heat exchanger/insulator.

The inverter 112 may be configured to convert DC electricity generated by the photovoltaic power generation and heat collection panel 111 into AC electricity. The outflow power (PW) generated by the inverter 112 may be stored in an energy storage unit (not shown) such as a battery.

The heat exchanger 113 may be configured to recover heat generated by the photovoltaic power generation and heat collection panel 111 as hot water (HW).

Hereinafter, referring to FIG. 1 , an operating mechanism of the photovoltaic power generation and heat collection unit 110 will be described in detail.

First, the photovoltaic power generation and heat collection panel 111 may absorb light energy from the sun and receive a heat medium (not shown) from the outside. The absorbed light energy may be converted into electricity and heat in the photovoltaic power generation and heat collection panel 111 .

Next, the generated electricity may be converted into AC electricity through the inverter 112 as DC electricity. In addition, the generated heat is sequentially passed through the heat medium transfer line L11, the heat medium transfer line L13, the heat medium transfer line L14, the pump P1 and the heat medium transfer line L15 by the action of the three-way valve V. circulated to the photovoltaic power generation and heat collection panel 111 (this is a bypass operation performed when the temperature of the heat medium is less than a certain level), the heat medium transfer line (L11), the heat medium transfer line (L12), the heat exchanger ( 113), the heat medium transfer line (L14), the pump (P1), and the heat medium transfer line (L15) may be circulated to the photovoltaic power generation and heat collection panel 111 in turn (this is when the temperature of the heat medium is above a certain level). normal operation conducted). At this time, cold water (CW) is supplied from the outside to the heat exchanger 113, and the cold water (CW) can be converted into hot water (HW) by exchanging heat with the heat medium flowing inside the heat medium transfer line (L11).

The heating medium may be gas or liquid. As an example, the heating medium may be air. As another example, the heat medium may be water or antifreeze.

Next, the hot water HW discharged from the heat exchanger may be supplied to the hot water storage unit 120 through the pump P2.

In addition, the energy self-sufficient photovoltaic power generation system 100 may further include a preheater (not shown) between the photovoltaic power generation and heat collection unit 110 and the hot water storage unit 120 . Specifically, the preheater additionally heats the hot water (HW) when the temperature of the hot water (HW) generated by the photovoltaic power generation and heat collection unit 110 is lower than the reference temperature (eg, 60 to 70 ° C). It serves to raise the temperature to the reference temperature.

The hot water storage unit 120 may be configured to store hot water (HW).

In addition, the amount of hot water (HW) stored in the hot water storage unit 120 may be increased as desired.

In addition, as the amount of hot water (HW) stored in the hot water storage unit 120 increases, the amount of electricity produced by the steam power generation unit 130 described below may also increase. Therefore, by increasing the amount of hot water (HW) stored in the hot water storage unit 120 as desired, the amount of electricity produced by the steam power generation unit 130 may also be increased as desired.

In addition, the hot water (HW) stored in the hot water storage unit 120 not only serves to heat the 1-3 working fluids as will be described later, but also some of the hot water (HW) is used as domestic hot water or hot water for heating. It can be.

In addition, the hot water (HW) stored in the hot water storage unit 120 may be maintained at a temperature of 60 to 70 °C.

The steam power generation unit 130 may be configured to generate electricity using the 1-1 working fluid that has undergone heat exchange with the hot water (HW) stored in the hot water storage unit 120 . As such, electricity generated by the steam power generation unit 130 mainly uses hot water (HW) and geothermal heat, and thus corresponds to renewable energy because it does not use fossil fuel or nuclear power.

Specifically, the steam power generation unit 130 may include a turbine (not shown) and an alternator (not shown) connected thereto.

In addition, the energy self-sufficient solar power generation system 100 may further include an evaporation unit 140 .

The 1-1 working fluid passes through the steam power generation unit 130 and is converted to the 1-2 working fluid, and the evaporation unit 140 performs a second operation described later by heat exchange with the 1-2 working fluid. The fluid is evaporated to convert the second working fluid into 1-3 working fluids, and the 1-3 working fluid passes through the hot water storage unit 120 and is supplied to the steam power generation unit 130. 1 A working fluid can be produced.

In addition, the energy independent photovoltaic power generation system 100 may further include a pump P4 configured to pump the first to third working fluids discharged from the evaporation unit 140 to the steam power generation unit 130 .

In addition, the energy-independent photovoltaic power generation system 100 may further include a pump P5 configured to pump the 1-2 working fluid discharged from the steam power generation unit 130 to the evaporation unit 140 .

The 1-1 working fluid to the 1-3 working fluid, the 1-4 working fluid to 1-7 working fluid described later, and the second working fluid may be the same material. The 1-1 working fluid to the 1-7 working fluid may be a gas, and the second working fluid may be a liquid. Accordingly, the 1-1 working fluid to the 1-7 working fluid may have a higher temperature than the second working fluid.

In addition, the energy self-sufficient photovoltaic power generation system 100 may further include a compression unit 150 .
The 1-2 working fluid discharged from the steam power generation unit 130 passes through the evaporation unit 140 and is converted into the 1-4 working fluid, and the compression unit 150 is the steam power generation unit 130 (specifically , turbine) and the evaporation unit 140 may be configured to produce first-fifth working fluids by compressing the generated working fluids 1-4. That is, the first-fourth working fluid may be compressed in the compression unit 150 and converted into a high-temperature and high-pressure gas (ie, the first-fifth working fluid).

delete

In addition, the energy independent photovoltaic power generation system 100 is stored in the hot water storage unit 120 by heat exchange with the 1-5 working fluids generated by compressing the 1-4 working fluids in the compression unit 150. It may be configured to heat hot water (HW). Accordingly, the hot water (HW) stored in the hot water storage unit 120 converts the heat lost to the low-temperature first to third working fluids discharged from the evaporation unit 140 into the first high-temperature first discharged from the compression unit 150. -5 Can be replenished from working fluid. In addition, the first to fifth working fluids may heat the hot water (HW) stored in the hot water storage unit 120 by heat exchange and then be converted into the first to sixth working fluids.

In addition, the energy self-sufficient photovoltaic power generation system 100 may further include a condensation unit 160 .

The condensation unit 160 converts the 1-6 working fluids generated by heat exchange between the 1-5 working fluids discharged from the compression unit 150 and the hot water HW stored in the hot water storage unit 120, which will be described below. 3 It may be configured to be condensed by heat exchange with the working fluid and converted into the 1-7 working fluids.

In addition, the energy self-sufficient solar power generation system 100 may further include an expansion unit 170 .

The expansion unit 170 may be configured to expand the first to seventh working fluids discharged from the condensing unit 160 to produce a second working fluid supplied to the evaporation unit 140 .

The second working fluid discharged from the expansion unit 170 and then supplied to the evaporation unit 140 has a lower temperature than the first to seventh working fluids supplied to the expansion unit 170 after being discharged from the condensation unit 160. can have

For example, expansion unit 170 may be an expansion valve.

The third working fluid supplied to the condensing unit 160 may be maintained at a lower temperature than the first to sixth working fluids supplied to the condensing unit 160 by geothermal heat.

In addition, the energy-independent photovoltaic power generation system 100 may further include a pump P3 configured to pump the third working fluid from the ground ER to the condensation unit 160 .

In addition, the energy independent solar power generation system 100 may further include a working fluid transfer line L21 and a working fluid transfer line L22.

The working fluid transfer line (L21) may be a pipe connected from the condensation unit 160 to the steam power generation unit 130 through the expansion unit 170, the evaporation unit 140, and the hot water storage unit 120 in turn, , The working fluid transfer line (L22) may be a pipe connected from the steam power generation unit 130 to the condensation unit 160 through the evaporation unit 140, the compression unit 150, and the hot water storage unit 120 in turn. there is.

In addition, the energy independent photovoltaic power generation system 100 may further include a working fluid transfer line L23.

The working fluid transfer line (L23) may be configured to raise the third working fluid from the ground (ER) to the ground, pass through the condensation unit 160, and then send it down to the ground (ER) again.

In addition, the working fluid transfer line L23 may include a heat insulating part IS and a heat conducting part CD.

Insulation (IS) may be located above the ground (ER) and above the ground. For example, the heat insulation unit (IS) may be installed in all parts of the working fluid transfer line (L3) where the temperature of the surrounding ground (ER) exceeds 17 ° C. and on the ground.

The heat conduction unit (CD) may be located below the ground (ER). For example, the heat conduction unit (CD) may be installed in a portion where the temperature of the surrounding ground (ER) is 17° C. or less of the working fluid transfer line (L3). For example, the heat conducting part CD may be maintained at a temperature of 15 to 17°C.

The third working fluid flowing inside the working fluid transfer line L23 may be supplied to the condensing unit 160 after being cooled by heat exchange with cold geothermal heat in the thermal conduction unit CD and passing through the insulation unit IS. At this time, the third working fluid may be supplied to the condensation unit 160 as it is cooled in the heat conduction unit (CD) without being heated again by the surrounding ground (ER) and air due to the existence of the insulation unit (IS). .

In addition, the energy self-sufficient solar power generation system 100 may further include an energy storage unit 180 .

The energy storage unit 180 may be configured to store electricity produced by the steam power generation unit 130 .

Also, the energy storage unit 180 may be omitted, and in this case, the energy storage unit 180 may be configured to transmit (transmit) electricity generated in the steam power generation unit 130 to the outside.

In addition, the energy self-sufficient photovoltaic power generation system 100 generates electricity (ie, renewable energy) produced by the steam power generation unit 130 alone or together with external power (fossil fuel and/or nuclear-based energy) through photovoltaic power generation. And it may be configured to be used as input power of the heat collection unit 110 (eg, operation power of the pumps P1 and P2, the three-way valve V, and/or the preheater).
At least one of the 1-1 working fluid to the 1-7 working fluid, the second working fluid, and the third working fluid may include an HFC-based working fluid. For example, at least one of the 1-1 working fluid to the 1-7 working fluid, the second working fluid, and the third working fluid may be R32, but the present invention is not limited thereto.

delete

Preferred embodiments according to the present invention have been described with reference to the drawings above, but this is only exemplary, and those skilled in the art can understand that various modifications and equivalent other embodiments are possible therefrom. There will be. Therefore, the scope of protection of the present invention should be defined by the appended claims.

100: Energy self-sufficient solar power system
110: solar power generation and heat collection unit 111: solar power generation and heat collection panel
112: inverter 113: heat exchanger
120: hot water storage unit 130: steam power generation unit
140: evaporation unit 150: compression unit
160: condensation unit 170: expansion unit
180: energy storage unit L11 to L14: heat medium transfer line
P1~P5: Pump V: 3-way valve
PW: Outflow power L21~L23: Working fluid transfer line
IS: Insulation part CD: Heat conduction part
ER: underground

Claims (16)

a photovoltaic power generation and heat collection unit configured to convert sunlight energy into electrical energy and thermal energy;
a hot water storage unit configured to store hot water obtained by recovering the thermal energy;
a steam power generation unit configured to generate electricity using the 1-1 working fluid that has undergone heat exchange with the hot water stored in the hot water storage unit;
As an evaporation unit, the 1-1 working fluid passes through the steam power generation unit and is converted into a 1-2 working fluid, and the 1-2 working fluid evaporates a separate second working fluid by heat exchange to An evaporation unit configured to convert the second working fluid into a 1-3 working fluid, and the 1-3 working fluid passing through the hot water storage unit to produce the 1-1 working fluid supplied to the steam power generation unit. ; and
The 1-2 working fluid discharged from the steam power generation unit passes through the evaporation unit and is converted into the 1-4 working fluid, and the 1-4 working fluid is compressed to produce the 1-5 working fluid. comprising a compression unit configured;
The energy self-sufficient solar power generation system configured such that the first-fifth working fluid heats the hot water stored in the hot water storage unit by heat exchange and then is converted into the first-sixth working fluid. According to claim 1,
The photovoltaic power generation and heat collection unit includes a photovoltaic power generation and heat collection panel, an inverter configured to convert DC electricity generated by the photovoltaic power generation and heat collection panel into alternating current electricity, and the photovoltaic power generation and heat collection panel. An energy self-contained photovoltaic system comprising a heat exchanger configured to recover generated heat as hot water. According to claim 1,
The energy self-sufficient solar power generation system further comprising a preheater between the photovoltaic power generation and heat collection unit and the hot water storage unit. delete delete delete According to claim 1,
An energy independent type further comprising a condensation unit configured to condense the 1st-6th working fluids heat-exchanged with the hot water after passing through the compression unit by heat exchange with the 3rd working fluid to convert them into 1-7th working fluids. solar power system. According to claim 7,
The energy self-sufficient photovoltaic system further comprises an expansion unit configured to expand the first to seventh working fluids discharged from the condensation unit to produce the second working fluid supplied to the evaporation unit. According to claim 7,
The third working fluid supplied to the condensation unit is maintained at a lower temperature than the first to sixth working fluids supplied to the condensation unit by geothermal heat. According to claim 9,
The energy-independent photovoltaic power generation system further comprising a working fluid transfer line configured to raise the third working fluid from the ground to the ground, pass through the condensation unit, and then send the third working fluid down to the ground. According to claim 10,
The energy self-sufficient solar power generation system, wherein the working fluid transfer line includes an insulation part located above and above the ground, and a heat conduction part located below the ground. According to claim 11,
The hot water stored in the hot water storage unit is maintained at a temperature of 60 to 70 ° C, and the heat conducting part of the working fluid transfer line is maintained at a temperature of 15 to 17 ° C. According to claim 1,
The steam power generation unit includes a turbine and an alternator connected thereto. According to claim 1,
Energy self-sufficient photovoltaic power generation system further comprising an energy storage unit configured to store electricity generated by the steam power generation unit. According to claim 1,
An energy self-sufficient photovoltaic power generation system configured to use the electricity generated by the steam power generation unit alone or together with external power as input power of the photovoltaic power generation and heat collection unit. According to claim 8,
At least one of the 1-1 working fluid to the 1-7 working fluid, the second working fluid, and the third working fluid includes an HFC-based working fluid.

Images