WO2015058485A1 - Temperature differential power generation method and system - Google Patents

Abstract

The present invention is applicable to the field of temperature differential power generation, and provided are a temperature differential power generation method and system. The temperature differential power generation method comprises: heating a low-boiling working medium using a heating medium to evaporate the low-boiling working medium into a gas state from a liquid state; cooling the gaseous low-boiling working medium into the liquid state from the gas state through a refrigerant at a preset height; and using the liquid low-boiling working medium to push a liquid turbine generator set to generate power so as to convert the gravitational potential energy of the liquid low-boiling working medium at the preset height into electric energy. With respect to adopting a steam turbine generator set to generate power, adopting a liquid turbine generator set to generate power substantially improves the utilization rate of thermal energy.

Description

Temperature difference power generation method and system

The invention belongs to the field of thermoelectric power generation, and in particular relates to a temperature difference power generation method and system.

There is a substantially constant temperature difference of 20 to 25 ° C in the ocean surface of the tropical region and hundreds to thousands of meters deep, which provides a huge and very stable source of cold heat for power generation. The basic principle of ocean temperature difference power generation (OTEC) is to use high temperature seawater on the surface of the ocean to heat and vaporize low boiling point working fluid, or to depressurize seawater by depressurization to drive steam turbines to generate electricity. At the same time, the exhaust gas after work is condensed by using low-temperature seawater (4 to 6 ° C) extracted from the sea floor to make it liquid again. At present, the theoretical estimated storage of ocean temperature difference energy in the world is 10 billion kilowatts, so OTEC was recognized by the 1981 United Nations Conference on New Energy and Renewable Energy as the most important of all ocean energy conversion systems.

The prior art method for circulating ocean temperature difference power generation is that the evaporator vaporizes the hot low boiling point working fluid, and then uses steam to drive the steam turbine generator set, and then uses the condenser to pass through the steam turbine included in the steam turbine generator set. The steam is cooled back to the liquid low boiling point working fluid, and the liquid low boiling point working fluid is pumped back to the evaporator by the working fluid pump. In the field of ocean temperature difference power generation, whether it is using the Rankine cycle or the UPR cycle, etc., the turbine is driven by a turbine to generate electricity. In the case of small temperature difference, such as a small temperature difference of 11 ° C to 25 ° C, steam is used. The efficiency of the circulating steam turbine power generation mode is very low: the first reason is that the gas pressure difference of the work gas is not too large; the second reason is that the volume change before and after the gas expansion work is not large; the third reason is that the steam turbine has higher requirements, and the steam turbine is in this kind of work. Under the condition, the conversion efficiency of the heat work is low, the output power is not large, and if the power is required, the steam turbine is bulky, or multiple steam turbines are needed, and a large energy harvesting field is formed on the sea surface, and the cost is high; After the expansion of the work, the gas is liquefied by the cold source, and it needs to consume more electric power to repress the liquid into the evaporator for circulation, etc., and under the temperature difference of less than 11 ° C, there is no engineering significance. Therefore, the existing circulating ocean temperature difference power generation method is used for power generation, the efficiency is low, the power generation cost is high, and commercial operation is limited.

 It is an object of the present invention to provide a method and system for temperature difference power generation for generating electricity using the cooled low boiling point working fluid in a liquid state.

In one aspect, the present invention provides a temperature difference power generation method, the temperature difference power generation method comprising:

Heating the low boiling point working medium by a heat medium to evaporate the low boiling point working medium from a liquid state to a gaseous state;

Cooling the gaseous low boiling point working fluid from a gaseous state to a liquid state through a refrigerant at a preset height;

The low-boiling working medium in a liquid state is used to drive the liquid turbine generator to generate electricity to convert the gravitational potential energy of the liquid low-boiling working medium of the preset height into electric energy.

In one aspect, the present invention also provides a thermoelectric power generation system, the thermoelectric power generation system comprising:

An evaporator for heating the low boiling point working medium by a heat medium to evaporate the low boiling point working substance into a gaseous state of the low boiling point working medium;

a condenser, the condenser being located at a preset height, for cooling the gaseous low boiling point working fluid to a liquid state of the low boiling point working medium by a refrigerant;

a gaseous working medium riser pipe for introducing the gaseous low boiling point working medium evaporated from the evaporator to the condenser;

The thermoelectric power generation system further includes:

a liquid turbine generator set for converting the gravitational potential energy of the liquid low-boiling working medium of the preset height into electric energy;

a liquid working fluid drop pipe for controlling the liquid flowing out of the condenser to pass through the liquid turbine of the liquid turbine generator set to drive the liquid turbine generator set to generate electricity.

The beneficial effects of the present invention are: using a small temperature difference of the predetermined height of the vertical, the liquid low-boiling working medium is heat-exchanged by using a heat medium to generate a gaseous low-boiling working medium; and the refrigerant is used at the preset height. Converting a gaseous low-boiling working medium into a liquid low-boiling working medium having a large gravitational potential energy, and utilizing the gravitational potential energy of the liquid low-boiling working medium to drive the liquid-generator set at a low height to generate electricity; The unit performs power generation and uses a liquid turbine generator set to generate electricity, which greatly improves the utilization of heat energy.

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the embodiments or the description of the prior art will be briefly described below. It is obvious that the drawings in the following description are only the present invention. For some embodiments, other drawings may be obtained from those of ordinary skill in the art in light of the inventive workability.

1 is a flowchart showing an implementation of a temperature difference power generation method according to Embodiment 1 of the present invention;

2 is a system architecture diagram of a thermoelectric power generation system according to Embodiment 2 of the present invention;

3 is a system architecture diagram of a thermoelectric power generation system suitable for temperate oceans according to Embodiment 2 of the present invention;

4 is a system architecture diagram of a thermoelectric power generation system suitable for use in a cold zone according to a second embodiment of the present invention.

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In order to explain the technical solution described in the present invention, the following description will be made by way of specific embodiments.

Embodiment 1:

FIG. 1 shows the workflow of the temperature difference power generation method provided in the first embodiment, and the implementation process thereof is as follows:

A temperature difference power generation method, the temperature difference power generation method comprising:

Step S11, heating the low boiling point working medium by a heat medium to evaporate the low boiling point working medium from a liquid state to a gaseous state;

In this embodiment, the heat medium exchanges heat with the low boiling point working medium in the evaporator to heat the low boiling point working medium, so that the liquid low boiling point working medium is evaporated into the gaseous low boiling point working medium.

As an embodiment of the present invention, the heat medium includes seawater of the ocean surface layer, geothermal heat, or waste heat of a thermal power plant.

In the present embodiment, the temperature of the seawater of the ocean surface layer and the temperature of the geothermal heat can be considered to be constant, so that the heat medium having the continuous heat energy can be provided for the temperature difference power generation method.

In addition, the waste heat generated by the thermal power plant can also be used as a heat medium to effectively utilize the waste heat of the thermal power plant to avoid waste of resources.

Thus, the heat medium can include an energy source of low grade thermal energy.

As an embodiment of the present invention, the low boiling point working fluid comprises: carbon dioxide, ammonia, ethane, propane, butane, perfluorocyclobutane or a low boiling azeotrope.

It should be noted that for different low boiling point working fluids, the boiling point and the liquefaction temperature are different under the same pressure, so the gaseous low boiling point working medium can raise the steam to the preset height due to the pressure difference generated by the temperature difference. It is also different. Taking ammonia as an example, at an effective temperature difference of 3 degrees Celsius, the highest level of gaseous ammonia can be raised to slightly more than 100 meters.

In the present embodiment, when a low boiling point working medium is selected, it is selected according to the temperature that the heat medium can continuously supply and the boiling point of the low boiling point working medium.

Step S12, cooling the gaseous low boiling point working fluid from a gaseous state to a liquid state through a refrigerant at a preset height;

It should be noted that the preset height is: a maximum height that the low boiling point working fluid in the gaseous state can rise to in the atmosphere, or a height that is artificially set lower than the maximum height in an actual design.

In this embodiment, at a preset height, the low-boiling working medium in the gaseous state is exchanged with the refrigerant and the low-boiling working medium in the condenser to cool the low-boiling working medium in the gaseous state to the low liquid state. Boiling point working fluid.

Preferably, the specific structure of the condenser can be determined and made according to the specific cooling rate and efficiency of the present thermoelectric power generation system.

As an embodiment of the invention, the preset height is at least 100 meters.

In this embodiment, in order to ensure that the low boiling point working fluid of the liquid state has sufficient gravitational potential energy to drive the liquid turbine generator set to generate electricity, the liquid liquid of the low boiling point working medium generated by the cooling is at the preset The height is at least 100 meters.

According to an embodiment of the present invention, the refrigerant includes seawater deep in the ocean or cold air in the atmosphere.

In this embodiment, if the deep seawater of the ocean is used as a refrigerant, a water pump is required to pump the deep sea of the ocean water to the predetermined height to cool the low boiling point working medium in the gaseous state.

In addition, since a large amount of cold air exists in the atmosphere reaching a certain height, it is also possible to directly use the cold air to cool the gaseous low-boiling working medium.

Preferably, in a cold zone, cold air at 0 degrees Celsius is selected as the refrigerant, and at the same time, seawater of 4 to 5 degrees Celsius under the ice layer is selected as the heat medium.

Step S13, using the liquid low-boiling working medium to push the liquid turbine generator to generate electricity to convert the gravitational potential energy of the liquid low-boiling working medium of the preset height into electric energy.

In this embodiment, since the liquid low-boiling working fluid generated by cooling at a preset height has a large gravitational potential energy, when the liquid low-boiling working fluid flows down, the liquid liquid is The low boiling point working fluid is introduced into the liquid turbine of the liquid turbine generator set through a liquid working medium drop pipe, and the liquid turbine drives the generator of the liquid wheel generator set to generate electricity. Preferably, the height of the liquid turbine generator set is slightly higher than or equal to the height of the evaporator, and the height difference between the condenser and the evaporator is the preset height, and therefore, the liquid wheel The height difference between the height at which the genset is located and the low boiling point working fluid in the liquid state which is generated by cooling may also be regarded as the preset height.

According to an embodiment of the present invention, the liquid low-boiling working medium after passing through the liquid turbine generator set is returned to the evaporator, and the liquid low-boiling working medium is heated by the heat medium to generate the The low boiling point working fluid in a gaseous state; thus, the step S11, the step S12 and the step S13 are sequentially cycled, and the low boiling point working medium can be recycled to generate electricity.

Embodiment 2:

It should be noted that the thermoelectric power generation system provided in this embodiment and the temperature difference power generation method provided in the first embodiment are applicable to each other.

2 shows a system architecture of a thermoelectric power generation system according to a second embodiment of the present invention. For the convenience of description, only parts related to the embodiments of the present invention are shown.

In the thermoelectric power generation system provided by this embodiment, the thermoelectric power generation system includes:

The evaporator 2 is configured to heat the low boiling point working medium by a heat medium to evaporate the low boiling point working medium into a gaseous state of the low boiling point working medium;

a condenser 4, the condenser 4 is located at a preset height, and is used for cooling the low-boiling working medium in the gaseous state to the low-boiling working medium in a liquid state by a refrigerant;

a gaseous working medium riser 3 for introducing the gaseous low boiling point working medium evaporated from the evaporator 2 to the condenser 4;

The thermoelectric power generation system further includes:

a liquid turbine generator set 9 for converting the gravitational potential energy of the liquid low-boiling working medium of the preset height into electric energy;

A liquid working fluid drop pipe 8 for controlling the liquid flowing out of the condenser 4 to pass through the liquid turbine 91 of the liquid turbine generator set 9 to drive the liquid turbine generator set 9 to generate electricity.

It should be noted that the preset height is: a maximum height that the low boiling point working fluid in the gaseous state can rise to in the atmosphere, or a height that is artificially set lower than the maximum height in an actual design. Preferably, in order to increase the preset height, the gaseous working medium riser 3 is made of a heat insulating material.

It should be noted that the heat medium in the evaporator 2 and the liquid low-boiling working medium are isolated from each other; the heat medium in the evaporator 2 is used for heat exchange with the liquid low-boiling working medium. Similarly, the refrigerant in the condenser 4 is isolated from the gaseous low boiling point working fluid; the refrigerant in the condenser 4 is used for heat exchange with the gaseous low boiling point working fluid.

It should be noted that, in general, for the same low boiling point working fluid, the gas volume is much larger than the liquid volume. Therefore, the cross-sectional area of the gaseous working medium rising pipe 3 is larger than the cross-sectional area of the liquid working medium falling pipe 8, such as a gaseous state. The pipe diameter of the working fluid riser pipe 3 is larger than the pipe diameter of the liquid working fluid down pipe 8.

It should be noted that when the preset height is high, the liquid turbine generators 92 included in the liquid turbine generator set 9 are respectively set at different heights to reduce the pressure of the liquid working medium drop pipe 8 to improve the liquid state. The efficiency of the conversion of the gravitational potential energy of a low boiling point working fluid into electrical energy.

It should be noted that the system provided in this embodiment requires a large amount of low boiling point working fluid to ensure that the volume of the liquid low boiling point working medium is at least twice the volume of the liquid working medium falling tube 8; when applied to the ultra large temperature difference In the case of a power station, if the cross-sectional area of the liquid working fluid descending pipe 8 is 3 square meters and the predetermined height is 500 meters, at least 3000 cubic meters of the liquid low-boiling working fluid, for example, ammonia is required. As a low boiling point working fluid, at least 1,800 tons of liquid ammonia is required; carbon dioxide is selected as a low boiling point working medium, and at least 2,500 tons of liquid carbon dioxide is required (in this way, a large amount of carbon dioxide needs to be sealed, which can effectively alleviate the greenhouse effect).

In this embodiment, the low boiling point working medium exchanges heat with the heat medium in the evaporator 2, and heats the low boiling point working medium into the gaseous low boiling point working medium; and controls the gaseous state through the gaseous working medium rising pipe 3. The low boiling point working medium is introduced into the condenser 4 by the evaporation direction of the low boiling point working medium; the gaseous low boiling point working medium is heat exchanged with the refrigerant in the condenser 4, The gaseous low boiling point working fluid is cooled to the liquid low boiling point working fluid; the liquid low boiling point working fluid is introduced into the liquid working medium falling pipe 8, the liquid low boiling point working medium The liquid working fluid descending tube 8 is flowed straight down, and the liquid turbine 91 of the liquid turbine generator set 9 is rotated to drive the liquid turbine 91 of the liquid turbine generator set 9 to drive the generator 92 of the liquid turbine generator set 9. Power generation. Preferably, the liquid low-boiling working medium after passing through the liquid turbine generator set 9 is redirected back to the evaporator 2 through the liquid working medium descending pipe 8.

As an embodiment of the invention, the thermoelectric power generation system further includes:

a liquid storage unit 7 for storing the liquid low-boiling working medium flowing out of the condenser 4;

a first control valve 61, located on the liquid working fluid drop pipe 8 between the condenser 4 and the accumulator 7, for shutting off or conducting the liquid low-boiling working medium;

a second control valve 62, located on the liquid working fluid downcomer 8 between the accumulator 7 and the liquid turbine generator set 9, for shutting down or conducting the low boiling point of the liquid quality.

Specifically, the first control valve 61 is used to shut off or conduct the liquid low-boiling working medium between the accumulator 7 and the condenser 4. The second control valve 62 is configured to turn off or turn on the liquid low-boiling working medium between the accumulator 7 and the liquid turbine generator set 9.

As an embodiment of the present invention, in order to ensure that the low boiling point working fluid of the liquid state has sufficient gravitational potential energy to drive the liquid turbine generator set 9 to generate electricity, the preset height is at least 100 meters.

In an embodiment of the invention, the heat medium comprises: seawater of the ocean surface layer, geothermal heat or waste heat of a thermal power plant;

The refrigerant includes: seawater deep in the ocean or cold air in the atmosphere.

Additionally, the heat medium further includes a heat source to provide low grade thermal energy.

Preferably, the heat medium is seawater of the ocean surface layer, and the refrigerant is seawater deep in the ocean;

The thermoelectric power generation system further includes:

Hot sea water inlet pipe 11;

a hot seawater feed water pump 13 is connected to the evaporator 2 through the hot sea water inlet pipe 11 for pumping the sea surface of the ocean surface into the evaporator 2;

a hot sea water outlet pipe 12 communicating with the evaporator 2 for returning seawater of the ocean surface layer in the evaporator 2 after heating the low boiling point working medium to the ocean;

Cold sea water inlet pipe 14;

a cold seawater feed water pump 15, communicated with the condenser 4 through the cold seawater inlet pipe 14 for pumping the deep ocean water in the ocean into the condenser 4;

The cold seawater outlet pipe 16 is in communication with the condenser 4 for returning the deep seawater of the ocean in the condenser 4 to cool the gaseous low boiling point working medium back to the ocean.

In the present embodiment, the sea surface water is pumped into the evaporator 2 by the hot seawater feed water pump 13 to heat the low boiling point working medium in the evaporator 2, and the liquid low boiling point working medium is converted into a gaseous state. a boiling point working medium; at a preset height, the deep seawater of the ocean is pumped into the condenser 4 through a cold seawater feed water pump 15 to convert a gaseous low boiling point working substance into a liquid low boiling point working medium, thereby The low boiling point working medium has a very large gravitational potential energy, and the liquid low boiling point working medium of the predetermined height flows downstream through the liquid working medium descending pipe 8 to drive the liquid turbine generator set 9 to generate electricity; The liquid low boiling point working fluid after unit 9 is redirected back into liquid evaporator 2.

Preferably, the refrigerant is atmospheric cold air, and the heat medium is seawater of the ocean surface layer. In the present embodiment, the condenser 4 can be placed on a mountain or a high-rise building, so that cold air of the atmosphere can be used as a refrigerant to cool the low-boiling working medium in the gaseous state; then, the generated liquid state is cooled. The low boiling point working fluid flows down the liquid working medium descending pipe 8 to push the liquid turbine generator set 9 to generate electricity. At a position where the gravitational potential energy is small, the low boiling point of the liquid state is heated by seawater of the ocean surface layer to vaporize the liquid low-boiling working medium into the gaseous low-boiling working medium, thereby The low boiling point working fluid is recycled to convert thermal energy contained in seawater of the ocean surface layer into electrical energy.

As an embodiment of the present invention, the low boiling point working fluid comprises: carbon dioxide, ammonia, ethane, propane, butane, perfluorocyclobutane or a low boiling azeotrope.

3 shows a system architecture of a thermoelectric power generation system suitable for temperate oceans according to a second embodiment of the present invention. For the convenience of description, only parts related to the embodiments of the present invention are shown.

As an embodiment of the present invention, when the system of the thermoelectric power generation system is used for temperate oceans, the whole is in the ocean. The condenser 4 is located on the surface layer or surface of the seawater; wherein the evaporator 2 and the liquid turbine generator set 9 are located in a deep layer of seawater.

4 shows a system architecture of a thermoelectric power generation system suitable for a cold zone according to a second embodiment of the present invention. For the convenience of description, only parts related to the embodiment of the present invention are shown.

As an embodiment of the present invention, when the system of the thermoelectric power generation system is used in a cold zone, the condenser 4 is located in a cool air layer in the atmosphere; wherein the evaporator 2 and the liquid turbine generator set 9 are located on the surface layer of the seawater. Further, seawater of 4-5 degrees Celsius below the ice layer is used as the heat medium, and cold air of a cold air layer is used as the refrigerant (for example, cold air at 0 degrees Celsius is used as a refrigerant). Therefore, a large amount of cold air (refrigerant) can be directly collected by the condenser 4.

The temperature difference power generation method and system provided by the embodiments of the present invention are applicable to an environment with small temperature difference such as upper and lower land platform, ocean surface layer and deep ocean layer; in particular, the ocean has a continuous heat energy, which is very suitable for warming tropical ocean temperature difference power generation and In the cold regions, sea water and high cold air temperature difference generate electricity. The embodiment of the invention utilizes a small temperature difference existing above and below the vertical height, and uses a heat medium to heat the low boiling point working medium contained in the evaporator located at a position with a small gravitational potential energy to become a gaseous low boiling point working medium; the gaseous low boiling point working substance resists Gravity works, rises along the gaseous working medium riser to the preset height (100 meters and above) and enters the upper condenser; then converts the internal energy of the gaseous low-boiling working medium into potential energy, and has a low liquid state with large gravitational potential energy. The boiling point working fluid descends along the liquid working medium drop pipe to push the liquid turbine generator set to generate electricity (gravity potential energy is converted into electric energy), and the liquid low boiling point working fluid flowing out after the liquid turbine generator set is reheated to a low gaseous state in the evaporator. The boiling point working fluid, in turn, continuously converts the small-temperature difference thermal energy into electrical energy output. Therefore, in the embodiment of the present invention, the thermal energy of the small temperature difference is preliminarily carried by the gaseous low boiling point working medium to a preset height for condensation, thereby converting the low grade thermal energy into the gravity potential energy of the liquid low boiling point working medium, and the thermal energy is converted into the gravitational potential energy. The process consumes very little energy, and can accumulate a large amount of small temperature difference heat energy into a liquid low-boiling gravity potential energy, increase the energy density, and use the gravity potential energy to work at the vertical height to drive the liquid turbine generator set to generate electricity, thereby making the gravity potential energy highly efficient. The conversion of ground to electrical energy provides an efficient and effective method for thermal energy utilization under small temperature differences.

It will also be understood by those skilled in the art that all or part of the steps of the foregoing embodiments may be implemented by a program to instruct related hardware, and the program may be stored in a computer readable storage medium. The storage medium described includes a ROM/RAM, a magnetic disk, an optical disk, and the like.

The above is a further detailed description of the present invention in connection with the specific preferred embodiments, and the specific embodiments of the present invention are not limited to the description. It will be apparent to those skilled in the art that <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; The scope of patent protection as determined by the book.

Claims (10)

A temperature difference power generation method, characterized in that the temperature difference power generation method comprises: Heating the low boiling point working medium by a heat medium to evaporate the low boiling point working medium from a liquid state to a gaseous state; Cooling the gaseous low boiling point working fluid from a gaseous state to a liquid state through a refrigerant at a preset height; The low-boiling working medium in a liquid state is used to drive the liquid turbine generator to generate electricity to convert the gravitational potential energy of the liquid low-boiling working medium of the preset height into electric energy. The thermoelectric power generation method according to claim 1, wherein said predetermined height is at least 100 meters. The thermoelectric power generation method according to claim 1, wherein The heat medium comprises: seawater of the ocean surface layer, geothermal heat or waste heat of a thermal power plant; The refrigerant includes: seawater deep in the ocean or cold air in the atmosphere. The temperature difference power generation method according to any one of claims 1 to 3, wherein the low boiling point working substance comprises: carbon dioxide, ammonia, ethane, propane, butane, perfluorocyclobutane or a low boiling azeotrope Working quality. A thermoelectric power generation system, the thermoelectric power generation system comprising: An evaporator for heating the low boiling point working medium by a heat medium to evaporate the low boiling point working substance into a gaseous state of the low boiling point working medium; a condenser, the condenser being located at a preset height, for cooling the gaseous low boiling point working fluid to a liquid state of the low boiling point working medium by a refrigerant; a gaseous working medium riser pipe for introducing the gaseous low boiling point working medium evaporated from the evaporator to the condenser; The thermoelectric power generation system further includes: a liquid turbine generator set for converting the gravitational potential energy of the liquid low-boiling working medium of the preset height into electric energy; a liquid working fluid drop pipe for controlling the liquid flowing out of the condenser to pass through the liquid turbine of the liquid turbine generator set to drive the liquid turbine generator set to generate electricity. The thermoelectric power generation system according to claim 5, wherein the thermoelectric power generation system further comprises: a liquid reservoir for storing the liquid low-boiling working fluid flowing out of the condenser; a first control valve, located on the liquid working medium drop pipe between the condenser and the accumulator, for shutting off or conducting the low boiling point working fluid of the liquid state; a second control valve, located on the liquid working fluid drop pipe between the liquid accumulator and the liquid turbine generator set, for shutting off or conducting the low boiling point working fluid of the liquid state. The thermoelectric power generation system of claim 5 wherein said predetermined height is at least 100 meters. The thermoelectric power generation system according to claim 5, wherein The heat medium comprises: seawater of the ocean surface layer, geothermal heat or waste heat of a thermal power plant; The refrigerant includes: seawater deep in the ocean or cold air in the atmosphere. The thermoelectric power generation system according to claim 8, wherein The heat medium is seawater of the ocean surface layer, and the refrigerant is seawater deep in the ocean; The thermoelectric power generation system further includes: Hot sea water inlet pipe; a hot seawater feed water pump communicating with the evaporator through the hot seawater inlet pipe for pumping the sea surface of the ocean in the ocean into the evaporator; a hot sea water outlet pipe communicating with the evaporator for returning seawater of the ocean surface layer after heating the low boiling point working medium to the ocean; Cold sea water inlet pipe; a cold seawater feed water pump communicating with the condenser through the cold seawater inlet pipe for pumping the deep ocean water in the ocean into the condenser; a cold seawater outlet pipe communicating with the condenser for returning the deep seawater of the ocean after cooling the gaseous low boiling point working fluid in the condenser to the ocean. The thermoelectric power generation system according to any one of claims 5 to 9, wherein the low boiling point working fluid comprises: carbon dioxide, ammonia, ethane, propane, butane, perfluorocyclobutane or a low boiling azeotrope .

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