JPS62298668A - Geothermal power system - Google Patents

Abstract

PURPOSE:To enhance heat collecting efficiency by separating the geothermal steam into air and water, driving a generator through rotation of a turbine with the separated steam, performing gasification of Fleon gas using the hot water, and rotating a Fleon turbine using this gasification gas for driving of generator. CONSTITUTION:Geothermal steam from a pipeline 1 is separated by an air-water separator 2 into steam and hot water, wherein the steam is sent to a steam turbine 3 to be utilized for driving a generator 4. The used steam comes into a condenser 5 and is condensed into water by cooling water from a cooling tower 7. The hot water, on the other hand, flows through No.1 stage and No.2 stage heat exchangers 12, 18, and is exhausted to outside the system after rotating a small hydraulic wheel 19. Fleon gas is supplied to these heat exchangers 12, 18 by a Fleon pump 17 and turned into pressurized fluid by the heat exchangers 12, 18, to be then lead out to a Fleon turbine 13, wherein it is used for driving a power generator 14.

Description

[Detailed description of the invention] 3. Detailed description of the invention [Technical field to which the invention pertains] This invention efficiently utilizes the energy remaining in relatively low-temperature hot water that is discarded in conventional geothermal power generation systems. This article relates to a geothermal power generation system.

[Prior art and its problems]

In conventional geothermal power generation systems, geothermal steam containing hot water (saturated water) obtained from geothermal wells is sent to the first stage steam separator to separate it into steam and hot water, and the steam is sent to a steam turbine. The hot water is further sent to the next-stage steam-water separator, where it is inflated to a low-pressure state to generate steam, which is then supplied to the low-pressure narrow port of the steam turbine and used for power generation. The hot water separated by the separator is often discharged into rivers and disposed of, or returned to geothermal wells, and it is difficult to say whether geothermal energy is being fully utilized. Ta.

The conventional geothermal power generation system will be explained in detail below based on the drawings.6 Figure 2 is a schematic diagram of the conventional geothermal power generation system, in which geothermal steam ( The combined hydrocarbon water) is first sent to the first stage steam/water separator 2 where it is separated into steam and hot water, and the steam is sent to the high pressure section of the steam turbine 3 to power the generator 4. The remaining hot water is sent to the second-stage steam-water separator 8, where it is expanded to a low-pressure state and further separated into steam and hot water, and the steam is sent to the low-pressure section of the steam turbine 3. In cooperation with the steam sent to the high pressure section earlier, the steam turbine 3 is driven, and the directly connected generator 4 is turned to generate electricity. The steam that has driven the steam turbine 4 enters the condenser 5 and is cooled. It comes into direct contact with the cooling water from tower 7 and is cooled and becomes condensed water.
The condensate pump 6I sends the water to the cooling tower 7 and uses it as cooling water. Also, ji -e -, jc yo -C yo in condenser 5. Bubbles, □ki oil, bu. A 1° angle is provided to release air mixed into the steam and non-condensable gases contained in the steam into the atmosphere.

In this system, which is equipped with two stages of steam and water separators, geothermal steam is expanded in two stages, and the steam generated is used to drive a turbine and generate electricity. The hot water after this process is discharged and discharged, but even though this discharged hot water has suffered a pressure loss due to the heat exchanger, it still has a considerable pressure level and temperature, so it is necessary to discard it. It cannot be said that the energy of geothermal steam has been fully utilized.The present invention aims to further utilize this remaining energy.
The aim is to make efficient use of this.

[Purpose of the invention]

The present invention is a system that recovers and uses the residual energy of hot water more efficiently than the above-described system that expands geothermal steam in two stages to generate electricity. The purpose is to provide.

[Summary of the invention]

According to the present invention, the above object is achieved by separating geothermal steam into high pressure steam and hot water in the first stage steam separator, and using the steam to drive a steam turbine. A heat exchanger is installed in two stages following the water separator, and the hot water separated by the steam water separator is heated with fluorocarbon gas in the heat exchanger of the first stage, and the heat exchanger is heated in the second stage. The fluorocarbon gas is used to preheat the fluorocarbon gas in an exchanger to drive a fluorocarbon turbine to generate electricity, and the low-temperature hot water after passing through the second stage heat exchanger is used to drive a small water turbine to generate electricity or auxiliary power. This is achieved by ensuring that the

[Embodiments of the invention]

An embodiment to which the present invention is applied will be described below with reference to FIG. FIG. 1 is a schematic system diagram of a geothermal power generation system according to an embodiment, and the same parts as in FIG. 2 used for explaining the conventional example are given the same reference numerals.

The steam is sent to the steam turbine 3, where it is separated into steam and hot water, and the steam is sent to the steam turbine 3, where it is used to turn the generator 4 and supply electric power to the connected electric power system (not shown). The used steam enters the condenser 5, contacts the cooling water sent from the cooling tower 7, condenses, and is sent to the cooling tower 7 by a condensate pump driven by a motor to be used as cooling water. .

The hot water remaining in the steam-water separator 2 is transferred to a first-stage heat exchanger 12 and a second-stage heat exchanger 12, which are arranged in two stages following the steam-water separator 2.
The heat exchanger 18 of the stage is sent via the pipe 31 and further
After flowing through the small water turbine 19, it is discharged outside the system.

On the other hand, the first-stage heat exchanger 12 and the second-stage heat exchanger 4 high heat exchanger 8 are each provided with meandering heat transfer tubes, and these heat transfer tubes are connected to a front turbine 13, a condenser 15,
The hot well 16 and the freon pump 17 are connected to form a part of a conduit 32 that forms one closed circuit. Therefore, the fluorocarbon gas flowing through this closed circuit is heated by the hot water flowing through the two heat exchangers 12 and 18, becomes a pressurized gas, and is supplied to the fluorocarbon turbine 13, which drives the turbine and is connected to it. The generator 14 is turned on and power is generated. The fluorocarbons worked in the fluorocarbon turbine 13 are indirectly cooled in the condenser 15, condensed and liquefied, and stored in the hot well 16. This Freon is pressurized by the Freon pump 17 and preheated in the second stage heat exchanger 18 via the pipe line 32, and then transferred to the first stage heat exchanger 1.
2, the gas is further heated, becomes a pressurized gas, and is sent to the float turbine 13 via the pipe line 32, driving it and generating the generator 14.
It turns the . Although not shown, the second stage heat exchanger 18 can be connected to other waste heat sources, solar heat collectors, heat transfer tubes, water pumps, and solar heat collectors arranged in the second stage heat exchanger 18. If necessary, a closed circuit formed by sequential connection may be added to collect and flow solar heat and heat the fluorocarbon circulating within the heat exchanger.

As explained above, the geothermal power generation system according to the present invention is configured to have a binary cycle consisting of a power generation cycle using geothermal steam and a power generation cycle using fluorocarbon gas. Furthermore, since the small water turbine 19 is driven and its rotational force is used to drive the condensate pump, the energy of the geothermal steam can be effectively utilized down to a low temperature range of 100° C. or less. In this way, the concept of the present invention is not only applicable to geothermal steam, but can also be applied to various industries that discharge waste hot water.

〔Effect of the invention〕

As can be seen from the above description, the power generation system of the present invention uses geothermal steam containing hot water (saturated water) obtained from a geothermal well, and is separated from the power generation circuit that directly uses the separated steam. A binary cycle is formed with a power generation circuit that uses the heat of the hot water indirectly, and the waste low-temperature hot water discharged from the latter power generation circuit drives a small water turbine to generate power or condensate pump etc. By configuring it so that it can be used as auxiliary power for auxiliary equipment, it is possible to use not only the separated steam energy, but also the energy contained in the hot water, and the efficiency of using the energy contained in geothermal steam. This makes it possible to provide a power generation system that can significantly improve energy efficiency.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a geothermal power generation system according to an embodiment of the present invention, and FIG. 2 is a schematic diagram of a conventional geothermal power generation system. 2: Steam water separator, 3; Steam turbine, 5; Condenser, 7;
Cooling tower, 12: First stage heat exchanger, 13; Freon turbine, 1s; Condenser, 17; Freon pump, 18: Second stage heat exchanger, 19; Small water turbine, 31.32, 33.34: Pipes Road.

Claims (1)

[Claims] 1) A steam power generation cycle consisting of a steam turbine, a condenser, a condensate pump, and a cooling tower, a heat exchanger that heats an organic heat medium, and an organic heat medium that has passed through the heat exchanger. This is a geothermal power generation system that is equipped with two power generation cycles: an organic heat medium power generation cycle consisting of a fluorocarbon turbine, a condenser, and a fluorocarbon pump that are driven by supplying fluorocarbons. Separate into steam and hot water in a vessel,
By supplying steam to the steam turbine and sending hot water to the heat exchanger, the two systems of power generation cycles are operated, and the low temperature hot water after flowing through the heat exchanger is used to generate a small water turbine. A geothermal power generation system characterized in that it is configured to drive a geothermal power generation system and obtain power generation or auxiliary power. 2) In the geothermal power generation system according to claim 1, the heat exchanger through which the hot water from the steam separator flows is:
The organic heat medium is heated and expanded in the first stage heat exchanger and supplied to the fluorocarbon turbine, and the second stage heat exchanger heats and expands the organic heat medium sent through the fluorocarbon pump. A geothermal power generation system characterized by being configured to preheat a heat medium and feed it to the first stage heat exchanger. 3) In the geothermal power generation system according to claim 2, the second stage heat exchanger is provided with means for causing hot water from the solar heat collector to flow through the pipe line, and the heat exchanger A geothermal power generation system characterized by being configured to heat hot water flowing through a vessel.