JPH11248260A - Method for realizing artificial hot spring - Google Patents

Abstract

PROBLEM TO BE SOLVED: To supply hot water similar to that of hot spring stably by inserting an inner casing through an interval into an outer casing leading to a geothermal source, conducting the interval with the inner hole of the inner casing to form a going path and a return path, and heating injected water. SOLUTION: An inner casing 11 is inserted into an outer casing 1 through an interval forming a going passage 9. Water 19 conditioned to have desired components is then injected from an injection port 17 made in the ground opening thereof. The water 19 flows down through the passage 9 with the temperature being raised gradually through geothermal action. The hot water, i.e., artificial hot spring 19a water, intrudes into the inner hole 12 of the inner casing 11 through a conduction hole 15 made in the bottom 13 thereof under action of the hydraulic pressure of subsequent supply water 19. A water supply pump installed on the ground is operated to pump up the hot spring water 19a in the inner casing 11 and take out from a take-out port 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing an artificial hot spring which is not a hot spring (natural hot spring) according to the hot spring method, but which can be made to have the same components or to freely design the contents of the components.

[0002]

2. Description of the Related Art A hot spring is defined as "hot water, mineral water, steam and other gases (excluding natural gas containing hydrocarbons as a main component) flowing out of the ground under the hot spring method.
Or more than a specified amount in 1 kg of mineral water ". Therefore, in the past, hot springs were excavated and collected from wells.

[0003] That is, the conventional hot spring excavation is carried out by examining the existence of a stratum having a high pumping coefficient (that is, a hot spring water body layer) and the amount of pumped water by test boring, and thereafter burying a well pipe in an appropriate place. Recently, due to the hot spring boom, hot spring drilling has been actively conducted in various parts of Japan, and in some places there is concern that hot springs may be depleted.

[0004]

According to the conventional hot spring collecting method, there are the following disadvantages. First, there is a problem of the restriction of hot spring collection by the hot spring method. Even in lands with different ownership, the stratum where the hot spring comes out may be connected underground,
In such a place, it may not be possible to dig a hot spring even on its own land to protect the existing hot spring source (Article 9 of the Hot Spring Law).

There is also the problem of empty wells. Excavation of hot springs is very expensive, so as mentioned above, test boring and pumping tests are repeated to carefully select the right place. However, even when it is determined that the hot spring is in the right place due to the spring, when the unexpected water content is low or the amount used is large, the hot spring may eventually be depleted. In addition, water quality is poor in terms of taste, smell, turbidity, gas, acidity, and the like, so that it may not be used. In such a case, the development cost, which is said to cost tens of millions to hundreds of millions of yen, is not only wasted, but also adversely affects the tourism industry and the like that have been raised.

[0006] Excessive pumping of hot springs also causes a problem of land subsidence in some places.

[0007] In addition, when boiling water is used to solve the above problems, there is a disadvantage that a large amount of energy is consumed.

An object of the present invention is to solve the above-mentioned drawbacks and to stably and surely provide hot water equivalent to that of a hot spring and effectively protect the environment.

[0009]

Means for Solving the Problems To achieve the above object, a method for producing an artificial hot spring according to the present invention comprises inserting an inner casing at an interval into an outer casing inserted up to a geothermal source; The space and the inner hole of the inner casing communicate with each other to form a forward path and a return path, and water injected from the ground is heated and extracted by geothermal heat while passing through the path having the distance. Further, in the method for producing an artificial hot spring according to claim 1, the water injected from the passage is heated while passing through the passage (outgoing passage) and taken out from the inner hole of the inner casing. Claim 1
The method for producing an artificial hot spring described above is characterized in that the water injected from the inner hole of the inner casing is heated during passage through the passage (return passage) and is taken out from the passage. In the method for producing an artificial hot spring according to claim 1, a communication hole is provided in a bottom portion of the inner casing.
The method for producing an artificial hot spring according to claim 1 is characterized in that the component of water to be injected is set as desired.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a method for producing an artificial hot spring according to the present invention will be described in more detail with reference to the drawings showing an embodiment. Reference numeral 1 denotes an outer casing, which is formed by connecting a number of casing tubes (not shown) which are made of a material having a high thermal conductivity, such as steel and copper, and which are open at the top and bottom. The outer casing 1 has only a bottom portion 3 having only a casing tube constituting a lower end portion.
And the upper part 5 is opened, and is inserted into the excavation hole 7 excavated deep into the ground to reach a high geothermal layer serving as a geothermal source. Drilling is performed in areas where underground geothermal structures are already known.
The measurement is performed using a well-known investigation method such as a method of measuring the temperature in the ore and a geophysical exploration method.

The high geothermal layer is at a different depth depending on the geothermal source. That is, the geothermal source is a volcanic geothermal source derived from underground magma energy, a non-volcanic geothermal source derived from frictional heat due to fault motion, heat of chemical reaction, heat due to radioactivity, etc. Groundwater (ie,
Underground geothermal source derived from the energy of hot springs)
Each of them has different emission energy. In general, the former has a large emission energy, and the latter has a small energy. Therefore, the depth of the excavation hole 7 differs depending on the geothermal source at the excavation site. In the case of a groundwater source, it is generally said that the rate of increase in the underground temperature in Japan increases by about 4 ° C. every time a depth of 100 m is excavated (according to the inventor's data, an increase in the ground temperature of about 4.35 ° C./100 m on average). There is).
Therefore, since geothermal heat is surely increased with the excavation, it is not necessary to repeat test boring and pumping tests in this excavation. Reference numeral 11 denotes an inner casing, which is inserted inside the outer casing 1 with a space therebetween, and forms the passage 9 by the space. The inner casing 11 is made of resin, ceramic,
Upper and lower open casing tubes (not shown) made of a material having high heat insulation efficiency, such as pulp hardened with resin, are connected in a large number of lines. The inner casing 11 has a large number of communication holes 15 in the bottom portion 13 of only the casing tube constituting the lower end portion.

Thus, using the above-mentioned passage 9 as an outward passage, water 19 adjusted to a desired component content is injected from an injection port 17 formed in the opening above the ground. The water 19 travels downward in the passage 9 as indicated by the arrow, and as it proceeds downward, the temperature of the water rises due to the action of geothermal energy.

In the case of an underground geothermal source, the depth is usually deep, so that even if there is a part of the passage 9 where the geothermal temperature is partially low, for example, in the upper part, the geothermal energy becomes larger as it goes down. Because it is heated, it is practically unaffected by low geothermal layers. The water intake temperature is often set to 100 ° C. or lower for convenience of use. For example, when water is to be taken at about 40 ° C to 43 ° C, excavation is usually performed to a depth of about 2,000 m. In such cases,
Geothermal near the bottom is about 80-87 ° C.
The hot water, that is, the artificial hot spring 19a, enters the inner hole 12 of the inner casing 11 from the communication hole 15 provided in the bottom portion 13 of the inner casing 11 by the water pressure of the water 19 subsequently supplied. Therefore, the water pump (not shown) installed on the ground is operated to activate the inner casing 11.
By pumping up the artificial hot spring 19a inside, the artificial hot spring 19a is taken out from the outlet 21 formed at the ground-side open end of the inner casing 11.

[0014] The water intake temperature is determined by the temperature and amount of the injection water,
The excavation depth is designed so as to have a desired water intake temperature because it is affected by the volume and thermal conductivity of the outer casing 1, the heat insulation efficiency of the inner casing 11, the amount of heat released from the geothermal source, and the like.

According to the above-described embodiment, since the hot water flowing from the ground is not collected, there is no problem of the restriction of the hot spring by the hot spring method. Therefore, even when there is an existing hot spring source in an adjacent land or the like, it is possible to freely obtain hot water (artificial hot spring) in which components equivalent to natural hot springs or component contents are freely designed.

Further, the geothermal heat is surely increased with the excavation, and the artificial hot spring 19a according to the present invention uses this geothermal heat, so that there is no fear of depletion. Therefore, it is necessary to avoid the presence or absence of hot water veins and the measurement of water content which are the most important in excavation of hot springs, or to deplete hot springs due to excessive use, or to reduce the quality of drainage water, or various losses resulting from these. Can be.

Further, since the artificial hot spring 19a according to the present invention does not collect hot water that springs from the ground, there is no possibility that the pumping will cause land subsidence.

Further, since the heating source is natural geothermal, there is no possibility of causing various problems due to energy consumption.

Furthermore, since the components of the water 19 to be injected can be set as desired, the artificial hot spring 1 according to purpose and effect can be set.
9a can be obtained. Also, the intake temperature can be designed according to the application.

The method for producing an artificial hot spring according to the present invention is not limited to the above embodiment. For example, when heating with a volcanic geothermal source, the flow of water can be in the opposite direction to that of the illustrated embodiment. That is, in this case, the water injected from the inner hole 12 of the inner casing 11 flows out of the communication hole 15 into the passage 9 between the outer casing 1 and the inner casing 11, and is heated while passing through the passage 9 (return path). And take it out. Since the volcanic geothermal source is generally located in a shallow place underground (for example, at a position of about 100 m to 200 m), the moving distance of hot water passing through the passage 9 (return path) can be short, so that the influence of cooling during movement is small. For this reason, it is possible to make the water flow in the opposite direction to the illustrated embodiment.

The casing tube constituting the outer casing 1 may be made of any material having a high thermal conductivity. Also, the inner casing 11
Is not limited as long as it is made of a material having high heat insulation efficiency. Furthermore, the inner casing 11 may be inserted with a space between the outer casing 1 and the inner casing 11, and the inner casing 11 does not necessarily have to be provided coaxially with the outer casing 1.

The mode of taking out the artificial hot spring is optional. For example, the hot spring may be taken out by a water supply pressure of a water supply pump without using a water pump.

[0023]

As described above, according to the method for producing an artificial hot spring according to the present invention, it is possible to stably and reliably provide hot water equivalent to that of a hot spring and effectively protect the environment.

[Brief description of the drawings]

FIG. 1 is a front sectional view illustrating a method for producing an artificial hot spring according to the present invention.

FIG. 2 is a plan view of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer casing 3 Bottom part 5 Top part 7 Excavation hole 9 Interval 11 Inner casing 12 Inner hole 13 Bottom part 15 Communication hole 17 Inlet 19 Water 19a Artificial hot spring 21 Outlet

Claims (5)

[Claims] An inner casing is inserted into an outer casing inserted up to a geothermal source with an interval therebetween, and an outward path and a return path are formed by communicating the interval with an inner hole of the inner casing. A method for producing an artificial hot spring, characterized in that water injected from the ground is extracted by heating with geothermal heat while passing through a passage having the above intervals. 2. The method for producing an artificial hot spring according to claim 1, wherein the water injected from the passage is heated during passage of the passage (outward passage) and is taken out from the inner hole of the inner casing. Production method. 3. The method for producing an artificial hot spring according to claim 1, wherein the water injected from the inner hole of the inner casing is heated while passing through a passage (return path) and taken out from the passage. Production method. 4. The method for producing an artificial hot spring according to claim 1, wherein a communication hole is provided in a bottom portion of the inner casing. 5. The method for producing an artificial hot spring according to claim 1, wherein a component of water to be injected is set as desired.