JP2023061059A - Geothermal exchanger and geothermal power generator - Google Patents

Abstract

To provide a geothermal exchanger and a geothermal power generator which can stabilize power generation output by preventing reduction in a generated steam amount due to the fact that supply of heat from a geothermal zone does not continue for a long period of time.SOLUTION: Pressure water prepared by pouring water from the ground to a double pipe 15 having an outer pipe 1 and an inner pipe 2 installed underground so as to be heated by heat of a geothermal zone is sent to a steam generator 4 and is taken out as steam. Heat fluid taken out of an underground well 8 by a flush method is sent to a steam generator 9 and is taken out as steam. A part of the high temperature pressure water generated in the double pipe 15 is injected around the well 8 underground. The steam generated by the steam generators 4, 9 is sent to a turbine 7, and power is generated.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a geothermal exchanger and a geothermal power generation device capable of stabilizing power output.

Flash-type geothermal power generation, which generates electricity by extracting thermal fluid from an underground heat source, has been in practical use for a long time. Decrease. Therefore, the problem is that the power output is not stable, and this is the cause of the need to systematically stop the power generator for maintenance.

On the other hand, Patent Literature 1 describes an example of a power generation device in which water is injected from the ground into a geotropical zone to generate high-temperature pressurized water, and the pressurized water is extracted above the ground to generate power.

Japanese Patent No. 6844880

In flash-type geothermal power generation, stabilizing the power output is a long-cherished desire. , function effectively as an alternative to the shutdown of nuclear power generation.

The present invention has been made in consideration of such circumstances, and stabilizes the power output by preventing the reduction in the amount of steam produced due to the long-term discontinuity of the heat supply from the geothermal area. An object of the present invention is to provide a geothermal heat exchanger and a geothermal power generation device capable of

In order to solve the above problems, the geothermal heat exchanger of the present invention is a double pipe having an outer pipe and an inner pipe installed underground, and the water injected from the ground is heated by the geotropical zone. The pressurized water obtained from the A geothermal heat exchanger that is sent to a generator and taken out as steam in a steam generator and this steam is sent to a turbine, wherein a part of the hot pressure water produced in the double pipe is sent underground It is characterized in that steam is generated by a flash method by being injected around the well.

Part of the high-temperature, pressurized water produced by the double pipes is sprayed underground around the well, and steam is produced by a flash method, thereby continuing the supply of heat from the geothermal area for a long period of time. It is possible to prevent a decrease in the amount of steam produced due to the fact that it is not done, and it is possible to stabilize the power generation output.

In the present invention, heating of the steam extracted to the ground can be done by an external heat source other than geothermal heat.

Heating the steam by an external heat source other than geothermal heat is effective as a countermeasure when the steam temperature is insufficient.

A geothermal power generation device of the present invention is characterized by generating power using the geothermal heat exchanger of the present invention.
As a result, it is possible to realize a power generation device capable of stabilizing the power generation output.

INDUSTRIAL APPLICABILITY According to the present invention, a geothermal heat exchanger and a geothermal power generation system are capable of stabilizing power generation output by preventing a decrease in the amount of steam produced due to long-term discontinuity of heat supply from a geothermal area. can be realized.

It is a figure showing composition of a geothermal exchanger concerning an embodiment of the present invention, and a geothermal power generator. It is a figure which shows the structure of a double pipe.

BEST MODE FOR CARRYING OUT THE INVENTION A geothermal exchanger and a geothermal power generation device according to the present invention will be described below based on embodiments thereof.
FIG. 1 shows the configuration of a geothermal heat exchanger and a geothermal power generator according to an embodiment of the present invention, and FIG. 2 shows the configuration of a double pipe.

Pressure water obtained by heating water injected from the ground into a double pipe 15 having an outer pipe 1 and an inner pipe 2 installed underground is supplied through a pressure water tank 3. It is sent to the steam generator 4 and taken out as steam within the steam generator 4 . This steam is sent to a turbine 7 via a steam tank 5 and a steam valve 6 to generate electricity.

Moreover, the thermal fluid taken out from the underground well 8 by the flash method is sent to the steam generator 9 , taken out as steam in the steam generator 9 , and heated by the steam heater 10 . This steam is sent to a turbine 7 via a steam tank 5 and a steam valve 6 to generate electricity. The flash method also includes a double flash method.

A portion of the high-temperature, pressurized water generated in the double pipe 15 is jetted around the well 8 underground. As a result, it is possible to prevent a decrease in the amount of steam produced due to a long period of discontinuation of heat supply from the geothermal area, and to stabilize power generation output.

Heating of the steam withdrawn above ground is provided by an external heat source other than geothermal heat, which may be methane gas, surplus heat from biomass power generation, renewable fuels, or a combination thereof.

Steam from the outlet of the turbine 7 is led to a heat exchanger 12 supplied with water from a water source 11 and condensed. Water is injected into the outer tube 1 of 15 . A portion of the water produced in heat exchanger 12 is sent to pressure water tank 3 . Also, the water generated within the steam generator 4 is sent to the circulation water tank 13 .

According to the above-described configuration, the situation in which the periphery of the well 8 dries up in the flash method is solved by injecting part of the high-temperature pressurized water generated by the double pipe 15 around the well 8. and the steam temperature is about 180°C. If the steam temperature is insufficient, external heat sources other than geothermal heat, such as methane gas, surplus heat from biomass power generation, and renewable fuels, are used.

Since the power output using the double tube is considered to be smaller than the power output by the flash system, it is positioned as a backup for the flash system. Therefore, the above method can be said to be a hybrid power generation method.

INDUSTRIAL APPLICABILITY The present invention provides a geothermal heat exchanger and a geothermal power generation system capable of stabilizing power generation output by preventing a reduction in the amount of steam produced due to the lack of heat supply from a geothermal area for a long period of time. Can be used widely.

1 outer tube 2 inner tube 3 pressure water tank 4 steam generator 5 steam tank 6 steam valve 7 turbine 8 well 9 steam generator 10 steam heater 11 water source 12 heat exchanger 13 circulation water tank 14 well circulation pump 15 double pipe

Claims (3)

Pressure water obtained by heating water injected from the ground into a double pipe having an outer pipe and an inner pipe installed underground is sent to a steam generator to generate steam. The steam is taken out in the generator, and this steam is sent to the turbine, and the thermal fluid taken out from the underground well by the flash method is sent to the steam generator, and taken out as steam in the steam generator, a geothermal heat exchanger through which this steam is sent to a turbine,
A geothermal heat exchanger characterized in that part of the high-temperature, pressurized water generated in the double pipe is jetted underground around the well to generate steam by a flash method. 2. A geothermal heat exchanger according to claim 1, wherein the steam taken to the ground is heated by an external heat source other than geothermal heat. A geothermal power generation system for generating power using the geothermal heat exchanger according to claim 1 or 2.

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