JP2700998B2 - Circulation type geothermal utilization equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for utilizing deep underground geothermal heat on the ground.

[0002]

2. Description of the Related Art It has already been proposed by the present inventor to provide an antifreeze circulation path between a deep underground bedrock and a heat exchanger on the ground to carry geothermal heat to the ground.

[0003]

An efficient device for extracting heat from deep underground rock has not been proposed yet. The present invention is intended to efficiently transfer heat in deep underground rock to the ground in winter, store heat on the ground surface underground in summer, and use the heat in winter.

[0004]

The present invention will be described with reference to the drawings. The circulation type geothermal utilization apparatus according to the first invention comprises a rib 2b in which an inner cylinder 2 is inserted concentrically with a gap therebetween and provided radially in an outer cylinder 1 whose lower end is closed by a small cylindrical portion 1b with a bottom. Constitutes a double pipe 3 in which the inner and outer cylinders 1 and 2 cannot be relatively displaced, and a vertical hole 8 having a diameter Db larger than the outer diameter d of the double pipe 3 is provided so as to reach the hard rock 9e from the ground 9a. The pipe 3 is inserted into the vertical hole 8, and silica sand 3 b is inserted between the vertical hole 8 and the double pipe 3.
And the first pipe 4 connected to the upper part of the inner cylinder 2 that has come out of the ground
a is connected to the antifreeze liquid inlet of the heat exchanger 4c, and the chamber 4 covers the gap between the inner and outer cylinders 1 and 2 coming out of the ground.
e, the antifreeze outlet of the heat exchanger 4c is connected via a second pipe 4d.

The circulating heat utilization apparatus according to the second invention has a small cylindrical portion 1 with a bottom formed at the lower end through a truncated conical surface portion 1a.
b, an inner cylinder 2 having a diagonally cut portion 2a at its lower end is inserted concentrically with a gap kept therebetween, and the inner and outer cylinders 1, 2 cannot be relatively displaced by a rib 2b provided in the gap. A heavy pipe 3 is formed, and a main vertical hole 8b having a diameter Db larger than the outer diameter d of the double pipe 3 is formed from the ground 9a to reach the hard rock 9e through the sand 9b, the soft rock 9c, and the medium hard rock 9d mixed with gravel. Provided,
At the upper end of the main vertical hole 8b, a stepped hole 8a having a large diameter Da is provided.
The double pipe 3 whose upper part is surrounded by the heat insulating material 3a is inserted into the main vertical hole 8b, the space between the main vertical hole 8b and the double pipe 3 is filled with the silica sand 3b, and the stepped hole 8a and the heat insulating material are formed. The cement milk 3c is injected and solidified with the material 3a, and the first pipe 4a connected to the upper part of the inner cylinder 2 that has come out to the ground is connected to the antifreeze liquid inlet of the heat exchanger 4c via the pump 4b, and is discharged to the ground. The antifreeze liquid outlet of the heat exchanger 4c is connected via a second pipe 4d to a chamber 4e that covers the gap between the inner and outer cylinders 1 and 2, and an air vent valve 4f is provided above the chamber 4e, and an electric heater 4g for heating the chamber 4e is provided. It is provided.

[0006]

In the winter season, the geothermal heat of the hard rock 9e, which reaches a depth of 150m, is applied by the antifreeze 5 to the inner cylinder 2, the first pipe 4a, the pump 4
b to the heat exchanger 4c to melt the snow on the roof and the road surface, and to guide and circulate the lower part of the double pipe 3 through the second pipe 4d, the chamber 4e, and the gap between the inner cylinder 2 and the outer cylinder 1. .
When the chamber 4e may be frozen, the electric heater 4
Heat with g.

In the summer, heat on the road surface is guided to the lower portion of the double pipe 3 by the antifreeze 5 through the heat exchanger 4c, the second pipe 4d, the chamber 4e, and the gap between the inner cylinder 1 and the outer cylinder 2, thereby forming the hard rock 9e.
And then circulates to the heat exchanger 4c via the inner cylinder 1, the first pipe 4a, and the pump 4b.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A polyethylene inner cylinder 2 having a diagonally cut portion 2a at a lower end is provided with a gap in a polyethylene outer cylinder 1 closed at a lower end by a polyethylene bottomed small cylindrical portion 1b formed through a truncated conical surface portion 1a. The inner and outer cylinders 1 and 2 constitute a double tube 3 which cannot be relatively displaced by a rib 2b which is inserted concentrically while keeping the same and provided in the gap.

[0009] From the ground 9a, gravel-mixed soil 9b and soft rock 9
c ・ Double pipe 3 to reach hard rock 9e via medium hard rock 9d
A main pipe 8b having a diameter Db larger than the outer diameter d of the pipe 3 is formed in a stepped hole 8a having a large diameter Da at the upper end of the main vertical hole 8b, and the upper portion is surrounded by a heat insulating material 3a. Is inserted into the main vertical hole 8b, and the silica sand 3 is inserted between the main vertical hole 8b and the double pipe 3.
and cement milk 3c is injected and solidified between the stepped hole 8a and the heat insulating material 3a.

A first pipe 4a connected to the upper part of the inner cylinder 2 coming out of the ground is connected to an antifreeze liquid inlet of a heat exchanger 4c via a pump 4b, and a chamber for covering a gap between the inner and outer cylinders 1, 2 coming out of the ground. The antifreeze outlet of the heat exchanger 4c is connected to 4e via a second pipe 4d.

An air vent valve 4f is provided above the chamber 4e and an electric heater 4g for heating the chamber 4e.
Is provided. The circulation path may be reversed as shown in FIG.

[0012]

According to the present invention, land subsidence does not occur because only antifreeze circulates. It is also effective because it uses the underground heat of hard rock with large heat capacity and can be used as a heat storage.

[Brief description of the drawings]

FIG. 1 is a vertical sectional front view of a first embodiment.

FIG. 2 is a vertical sectional front view of a second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer cylinder 1a Truncated conical surface part 1b Small cylindrical part with a bottom 2 Inner cylinder 2a Diagonal cut part 2b Rib 3 Double pipe 3a Insulation material 3b Silica sand 3c Cement milk 4a 1st piping 4b Pump 4c Heat exchanger 4d 2nd piping 4e Chamber 4f Air release valve 4g Electric heater 5 Antifreeze 8 Vertical hole 8a Stepped hole 8b Main vertical hole 9a Ground 9b Gravel mixed earth and sand 9c Soft rock 9d Medium hard rock 9e Hard rock

Claims (2)

(57) [Claims] A rib (2b) radially provided with an inner cylinder (2) inserted concentrically with a gap in an outer cylinder (1) whose lower end is closed by a small cylindrical portion (1b) with a bottom. Constitutes a double pipe (3) in which the inner and outer cylinders (1, 2) cannot be displaced relative to each other, and from the outer diameter (d) of the double pipe (3) so as to reach the hard rock (9e) from the ground (9a). Vertical hole with large diameter (Db)
( 8 ) is provided, the double pipe (3) is inserted into the vertical hole (8),
Vertical hole (8) and double tube (3) the first pipe filled with silicofluoride sand (3b), and connected among leaving the ground tube (2) at the top between the (4a)
Is connected to the antifreeze liquid inlet of the heat exchanger (4c), and the antifreeze liquid outlet of the heat exchanger (4c) is connected to the second pipe (4d) in the chamber (4e) covering the gap between the inner and outer cylinders (1, 2) that have come out above the ground. Circulating geothermal utilization device connected through 2. An inner cylinder having an obliquely cut portion (2a) at a lower end in an outer cylinder (1) closed at a lower end by a small cylindrical portion with a bottom (1b) formed through a truncated conical surface portion (1a). (2) a rib (2b) inserted concentrically with a gap and provided in the gap
Constitutes a double pipe (3) in which the inner and outer cylinders (1, 2) cannot be displaced relative to each other. From the ground (9a), sediment mixed with gravel (9b) and soft rock (9)
c) providing a main vertical hole (8b) having a diameter (Db) larger than the outer diameter (d) of the double pipe (3) so as to reach the hard rock (9e) through the medium hard rock (9d); A large diameter (Da) stepped hole (8a) is formed at the upper end of the main vertical hole (8b), and a double pipe (3) whose upper part is surrounded by a heat insulating material (3a) is inserted into the main vertical hole (8).
was inserted into the b), the main vertical hole (8b) and cement milk during the stepped bore (8a) and a heat insulating material and (3a) to fill the silicofluoride sand (3b) between the double tube (3) (3c) is injected and solidified, and the first pipe (4a) connected to the upper part of the inner cylinder (2) that has come out above the ground
Is connected to the antifreeze inlet of the heat exchanger (4c) via the pump (4b), and the inner and outer cylinders (1,
The heat exchanger (4) is placed in the chamber (4e) covering the gap of 2).
antifreeze outlet of c) through the second distribution pipe (4d) connected, said chamber (4e) air vent valve on the top (4
f) A circulation type geothermal utilization apparatus comprising a chamber (4e) and a heating electric heater (4g).