JP2001355566A - Geothermal power generating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a geothermal power generating device with favorable power generating efficiency and capable of stably providing power without being influenced by natural conditions. SOLUTION: In this geothermal power generating device, a circulating system for hot water and a circulating system for a low boiling point medium with a common riser and each is provided with a downcomer are buried underground, a separating device separating bubbles of the low boiling medium vaporized in the riser and hot water pumped up along with the bubbles is provided aboveground in a common part of both circulating systems, a liquefying device for the separated low boiling medium is provided in the circulating system for the low boiling medium, and a turbine rotated by falling hot water is provided in the downcomer for hot water. It generates power by torque of the turbine.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a geothermal power generator using a low-boiling medium installed in a volcanic zone.

[0002]

2. Description of the Related Art Among natural energy uses, geothermal energy can be obtained relatively unchanged without change compared to wind power or solar heat. Moreover, since Japan has a very large distribution of volcanoes, geothermal power generation has been implemented or various proposals have been made.

[0003] The geothermal power generation that is currently being carried out uses water to vaporize by geothermal heat and rotates a turbine by steam pressure to obtain electric power. However, it requires a large amount of geothermal energy together with the high temperature to vaporize water. Unless a volcanic environment is so blessed, constant operation is not guaranteed, and a geothermal power generation device using a low-boiling medium such as Florinate has been proposed (Japanese Patent Laid-Open No. 58-5485).

As shown in FIG. 4, the geothermal power generation device described in the publication discloses a method of supplying a low boiling medium liquid to a subsurface hot water layer 5 through a supply pipe 50.
1 and is vaporized in the pumping pipe 52 by hot water, and the bubbles rise while the hot water accompanies the pumping pipe, thereby maintaining the gas pressure and rotating the turbine at that pressure on the ground. The hot water pumped to the ground is separated from the air bubbles and converted into electric energy.
Returned to the basement by 5. Further, the vaporized low boiling point medium is liquefied by the cooling device 56 after the work is completed, and is again supplied to the underground by the supply pipe 50 for generating bubbles.

[0005]

According to the above-mentioned conventional geothermal power generator, the low-boiling-point medium vaporized by geothermal heat is reused after being recovered. Therefore, natural refrigerant is used for liquefaction by the cooling device. If it cannot be used, excessive energy (mainly the operating power of the compressor) is required, and there is a problem that the amount of power expected to be subtracted cannot be obtained. By the way, if you want to obtain this liquefied energy by, for example, wind or solar heat, it depends on natural conditions, and if you use snow or water refrigerant, it may be difficult due to volcanic terrain conditions. Many.

The present invention has been made in view of the above-described circumstances,
It is an object of the present invention to provide a geothermal power generation device that has good power generation efficiency and can stably supply power without being affected by natural conditions.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides an underground circulating system for hot water and a circulating system for a low-boiling-point medium, each having a common riser and having a downcomer. In addition to installing a separator in the common part of both circulation systems, a separator is installed on the ground to separate the gas bubbles in which the low-boiling liquid vaporized in the riser pipe from the hot water pumped along with the bubbles. A liquefier of the boiling gas was provided in the circulation system of the low-boiling medium, a turbine rotating by falling hot water was provided in the middle of the downcomer of the hot water, and a geothermal power generation device configured to generate power by the rotating force of the turbine was configured.

[0008] According to the above configuration, the hot water pumped up in the rising pipe together with the air bubbles is dropped into the downcoming pipe through the separation device, and the electric power is obtained by the rotational force of the turbine caused by the drop. Efficiently large power can be obtained efficiently. In addition, regarding the liquefaction of the low-boiling gas separated from the separation device, various forms can be adopted in the form of the liquefaction device depending on the environmental conditions as described below, so that the obtained electric power is not deducted as it is. Power can be transmitted.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, a low-boiling medium is a liquid that evaporates at a temperature extremely lower than the boiling point of water, and for example, boils at a temperature near normal temperature (5 to 30 ° C.). Fluorinate as a fluorine compound can be suitably used. In addition, if natural conditions such as the atmosphere, snow, and river water can be used for liquefaction of the low boiling point liquid, it is desirable that the liquefaction apparatus 11 adopt the use form. However, if it is difficult, a vaporization pressure is used as described in claim 2 and the following embodiments. If this is insufficient, it can be used together with natural conditions.

The geothermal circulation system 1 and the low-boiling medium circulation system 2 are connected by pipes (FIG. 1).
And a mode of taking in a hydrothermal layer 25 as groundwater of a volcano (FIG. 3). Either one can be selected depending on the power generation scale, volcanic topographical conditions, purpose of use, etc.

[0011]

As described above, according to the present invention, the potential energy of the water is converted into electric power by dropping the hot water pumped with the rise of the bubbles of the low-boiling medium. It has an excellent effect that the conversion efficiency is good and the power required for various uses can be stably supplied regardless of the natural conditions.

[0012]

Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 and FIG. 2 show a small-scale geothermal power generation device Pa capable of covering the power consumption of a mountain hut H, a general household, and the like. A circulation system 1 for hot water and a circulation system 2 for a low boiling point medium are shown. Are arranged in parallel, the riser 3 is made common to the parallel arrangement, the turbine 8 of the generator 7 is provided in the downcomer 5 of the hot water underground, and the separator 9 and the liquefaction of the hot water and the low-boiling gas 6b are provided above the ground. The device 11 is provided.

The hot water circulation system 1 comprises a riser 3 and a downcomer 5
The underground connecting pipe 12 and the above-mentioned separation device 9 are interposed between them, and the vertical dimension of the underground is about 3 m, and the turbine 8 is installed at a location of about 2 m below the ground. Further, the rotating shaft 13 of the turbine 8 is put out on the ground, and the generator 7 is provided on the ground. The water level L in the downcomer 5
Serves to help the hot water in the riser 3 rise.

The low-boiling medium circulation system 2 is provided with an inlet pipe 17 from the downcomer pipe 15 to the ascending pipe 3 underground, and a compressed air pipe 19 from the separator 9 to the liquefaction apparatus 11 above the ground. By providing the turbine 18 in the compressed air pipe 19, the power is used as a drive source of the liquefier 11. Reference numeral 21 denotes a power transmission shaft.

When the low-boiling liquid 6a liquefied by the liquefaction apparatus 11 flows down the downcomer pipe 5 and is injected into the lower end of the circulation system 1 of hot water, it has been heated by the geothermal heat so far. The hot water of No. 3 rises as bubbles in the hot water and then receives the heat to increase the bubbles, accompanied by the hot water and reaches the separation device 9, where the separated hot water falls into the downcomer 5. The turbine 8 is rotated to generate electric power by the generator 7, and the electric power is supplied to the hut H via the power transmission line 23.

FIG. 3 shows a large-scale geothermal power generation device Pb which is connected to the underground hot water layer 25, and is basically the same as that of the above-mentioned embodiment. 1 and the low-boiling-point medium circulation system 2 have a difference that the hot water layer 25 is partially taken in. A reservoir 27 is provided at the upper end of the downcomer 5 of the hot water. The reservoir 27 is temporarily stored in the reservoir 27 and then dropped, so that electric power can be stably obtained. Further, the generator 7 is provided inside a casing 29 into which the downcomer pipe 5 is inserted. The riser 3 and the downcomer 15 for the low-boiling liquid 6a are separately inserted into the casing 30 separately.

[Brief description of the drawings]

FIG. 1 is an explanatory cross-sectional view of a geothermal power generation device according to the present invention.

FIG. 2 is a perspective view showing a landscape where the geothermal power generation device is installed and used.

FIG. 3 is an explanatory sectional view of a geothermal power generation device according to another embodiment.

FIG. 4 is an explanatory diagram of a conventional example.

[Explanation of symbols]

 Pa, Pb Geothermal power generation device 1 Hot water circulation system 2 Low boiling point medium circulation system 3 Rise pipe 5 Downcomer pipe 6a Low boiling point liquid 6b Low boiling point gas 8 Turbine 9 Separation device 11 Liquefaction device 15 Downcomer 18 Turbine 25 Hot water layer

Claims (2)

[Claims] 1. A circulating system for hot water and a circulating system for a low-boiling medium, each having a common riser and having a downcomer, are buried underground, and air bubbles having a low-boiling liquid vaporized in the riser on the ground. In addition to installing a separation device in the common part of both circulation systems, which separates hot water pumped along with air bubbles, and a liquefier for the separated low-boiling gas in the circulation system of the low-boiling medium, A geothermal power generation device comprising: a turbine that rotates by falling of hot water provided in the middle of a water downcomer to generate power by the rotational force of the turbine. 2. The liquefaction apparatus according to claim 1, wherein a turbine rotating by the pressure of the low-boiling gas is provided between the liquefaction apparatus and the separation apparatus, and the rotational force of the turbine is used as a power source required for liquefaction. Geothermal power plant.