Geothermal power generation system

Description

BACKGROUND OF THE INVENTION

1. Field of the Invention

The invention relates to a power generation system, especially to a geothermal power generation system.

2. Description of the Prior Art

At present, geothermal power generation uses thermal energy underground to heat groundwater, convert it into steam, and then drive a generator to generate electricity. Hot spring power generation is also a form of geothermal power generation. Generally, the outlet temperature of hot springs must reach above 85° C. to achieve sufficient power generation benefits. The heat contained in the hot springs vaporizes the refrigerant and drives the generator to generate electricity. The method of hot spring heat exchange is to use two parallel pipelines at the same time, which are hot spring water and refrigerant. The hot spring water transfers heat energy to the refrigerant pipeline through thermal conduction, causing the refrigerant to evaporate and drive the generator.

SUMMARY OF THE INVENTION

An embodiment of the invention provides a geothermal power generation system without the need of refrigerant, comprising:

a heat collecting cover, comprising a cap and an opening, wherein the cap comprises a heat conducting layer, a thermoelectric conversion layer, and a heat dissipation layer, from inside to outside, wherein the opening faces a geothermal well;
a thermometer, capable of measuring a collector temperature of the heat conducting layer;
a lifter;
a control circuit, controlling a height of the heat collecting cover apart from the geothermal well via the lifter according to the collector temperature, wherein the heat collecting cover is moved away from the geothermal well when the collector temperature is higher than a temperature range, wherein the heat collecting cover is moved toward the geothermal well when the collector temperature is lower than the temperature range, wherein the heat collecting cover is not moved when the collector temperature is in the temperature range.

An embodiment of the invention provides a geothermal power generation system without the need of refrigerant, comprising:

a heat collecting cover, comprising a cap and an opening, wherein the cap comprises a heat conducting layer, a thermoelectric conversion layer, and a heat dissipation layer, from inside to outside, wherein the opening faces a geothermal well;
a thermometer, capable of measuring a collector temperature of the heat conducting layer;
an air valve, comprising an exhaust port, disposed in the geothermal well;
a control circuit, controlling a venting capacity of the geothermal well via the air valve according to the collector temperature, wherein the exhaust port is shrunk when the collector temperature is higher than a temperature range, wherein the exhaust port is expanded when the collector temperature is lower than the temperature range, wherein the exhaust port is not adjusted when the collector temperature is in the temperature range.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention as well as a preferred mode of use and advantages thereof will be best understood by referring to the following detailed description of an illustrative embodiment in conjunction with the accompanying drawings, wherein:

FIG. 1 illustrates a diagram of cross-section of a heat collecting cover.

FIG. 2 illustrates a diagram of a geothermal power generation system.

FIG. 3 illustrates a diagram of another geothermal power generation system.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

In an embodiment, referring to FIG. 1, a cross-section of a heat collecting cover 1 is provided. The heat collecting cover 1 comprises a cap 11 and an opening 12. The cap 11 comprises a heat conducting layer 111, a thermoelectric conversion layer 112, and a heat dissipation layer 113, from inside to outside. In an embodiment, the heat conducting layer 111 may be a copper layer, aluminum layer, or zinc layer. The thermoelectric conversion layer 112 comprises multiple thermoelectric generating modules for converting the thermal energy to electric energy. The heat dissipation layer 113 comprises multiple heat dissipation fins. The opening faces a heat source, such as a geothermal well. The hot steam of the geothermal well is collected via the opening 12. The thermal energy of the hot steam is thermally conducted to the thermoelectric conversion layer 112 via the heat conducting layer 111. The thermoelectric conversion layer 112 converts the thermal energy to electric energy. The heat dissipation layer 113 dissipates the heat out of the thermoelectric conversion layer 112.

In an embodiment, referring FIG. 2, a geothermal power generation system comprises a heat collecting cover 1, a geothermal well 2, a lifter 3, a thermometer, a control circuit, and a power storage device. The opening 12 of the heat collecting cover 1 faces the geothermal well 2 to collect the hot steam coming from the geothermal well 2. The hot steam is used to generate electric power, and the electric power is delivered to the power storage device for storing.

In an embodiment, the thermometer comprises a non-contact thermometer, such as a infrared thermometer, or a contact-type thermometer, such as a temperature sensing chip. The thermometer is capable of measuring the collector temperature of the heat conducting layer 111 when the heat collecting cover 1 collects the hot steam.

In an embodiment, a control circuit is capable of controlling a height of the heat collecting cover apart from the geothermal well via the lifter according to the collector temperature. The heat collecting cover is moved away from the geothermal well when the collector temperature is higher than a temperature range. The heat collecting cover is moved toward the geothermal well when the collector temperature is lower than the temperature range. The heat collecting cover is not moved when the collector temperature is in the temperature range.

In an embodiment, the power storage device may be rechargeable batteries or supercapacitors.

In an embodiment, referring to FIG. 3, a geothermal power generation system comprises a heat collecting cover 1, a geothermal well 2, and air valve 4, a thermometer, a control circuit, and a power storage device. The opening 12 of the heat collecting cover 1 faces the geothermal well 2 to collect the hot steam coming from the geothermal well 2. The hot steam is used to generate electric power, and the electric power is delivered to the power storage device for storing. The air valve 4 is disposed in the geothermal well 2. The air valve 4 comprises an exhaust port 5. The area of the exhaust port 5 determines the venting capacity of the geothermal well 2.

In an embodiment, a control circuit is capable of controlling a venting capacity of the geothermal well via the air valve according to the collector temperature. The exhaust port is shrunk when the collector temperature is higher than a temperature range. The exhaust port is expanded when the collector temperature is lower than the temperature range. The exhaust port is not adjusted when the collector temperature is in the temperature range.