JP4421671B1 - Geothermal water environment conservation heat supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a geothermal water environment conservation type heat supply system that effectively uses geothermal water for melting snow and cooling a road surface, and returns the circulated geothermal water to an aquifer as much as possible without touching the outside air. To do.
SOLUTION: An outer tube 2 embedded over an aquifer L holding geothermal water, a geothermal water infiltration strainer 21 for allowing the geothermal water of the aquifer L to enter the outer tube 2, and an outer tube 2 The geothermal water pump 3 for pumping up the geothermal water that has entered the interior, the geothermal water supply pipe 4 for circulating the pumped geothermal water to the predetermined site F, and the geothermal water supply pipe The geothermal water reduction strainer 22 that circulates and returns the geothermal water returned to the exterior pipe 2 to the aquifer L, and water such as snowmelt water, rainwater, and water sprinkling generated in the site F flows out of the site F. A storage tank 5 that collects and stores without storage, water sprinkling means 6 that sprinkles the water in the storage tank 5 to the site F, and geothermal water from the geothermal water supply pipe 4 to the storage tank 5 as water for sprinkling Geothermal water replenishing means 7 for replenishing as appropriate is provided.
[Selection] Figure 1

Description

  The present invention relates to a geothermal water environment conservation type heat supply system that supplies geothermal water to a site or the like as a heat source while preserving the environment of geothermal water.

  In general, the temperature in the ground is kept almost constant throughout the year, and it is colder in summer and warmer in winter than the outside temperature. Conventionally, it has been proposed to pump up groundwater in the ground-heated aquifer and supply it as heat source for road surface cooling in summer and snow melting in winter.

  For example, in the patent No. 3927593, the inventor of the present application includes a geothermal water supply strainer that allows geothermal water to enter from an aquifer and uses geothermal heat that has been used from above the geothermal water supply strainer. An outer pipe provided with a reducing strainer for reducing water to the aquifer, a flow path is formed between the outer pipe and the intake pipe for taking in geothermal water into the pipe, and is further composed of a heat insulating material. A heat-insulating interior pipe, a pump for pumping up geothermal water, a heat source supply pumping pipe for pumping the geothermal water pumped up by this pump to a cooling / heating device, and a heat source reduction pipe communicated with the flow passage, Used in geothermal water and air conditioning units that have entered from the geothermal water supply strainer by configuring the flow path from the reducing strainer to the geothermal water supply strainer in the flow path so that it can be distributed without being divided. The by merging a portion of geothermal water proposes a dual pipe geothermal water circulating apparatus for pumping the water intake (Patent Document 1).

  According to this Patent Document 1, the double-pipe geothermal water circulation device is characterized by a strainer that contacts the aquifer while smoothly reducing the geothermal water collected from the aquifer to prevent well draining and ground subsidence. Even if clogging occurs, it can be used continuously.

Japanese Patent No. 3927593

  However, in the invention described in Patent Document 1, when geothermal water is used as a heat source for road heating, there is a problem that it takes time to melt snow when heavy snow falls. Even if snow is melted by sprinkling geothermal water, it will cause the well to wither and land subsidence.

  In addition, there is a problem that the geothermal water returned to the flow passage by the heat source reduction pipe takes air into the geothermal water at the time of entering, and the geothermal water is oxidized and activated. By the way, when water is oxidized, oxidation of the outer tube and the like is promoted, and when water is activated, there is a problem that the inside of the outer tube is soiled to promote the growth of animals and plants. Therefore, considering the aquifer environment, we want to reduce the quality of geothermal water to the aquifer without changing it as much as possible. Therefore, when reducing geothermal water, it is preferable to reduce it without touching the outside air.

  The present invention has been made in order to solve such problems, and uses geothermal water effectively for melting snow and cooling the road surface so that the circulating geothermal water is not exposed to the outside air as much as possible. It aims to provide a geothermal water environment conservation heat supply system that can be reduced to an aquifer.

  The geothermal water environment conservation type heat supply system according to the present invention includes an outer pipe embedded from the ground surface to an aquifer holding geothermal water, and a geological water that infiltrates the geothermal water of the aquifer into the outer pipe. A hydrothermal infiltration strainer, a geothermal water pump that pumps the geothermal water that has entered the outer pipe from the geothermal water intrusion strainer, and the geothermal water pumped by the geothermal water pump is circulated to a predetermined site. A geothermal water supply pipe serving as a heat source, a geothermal water reduction strainer that circulates the geothermal water supply pipe and returns the geothermal water returned to the exterior pipe to the aquifer, and is generated in the site. A storage tank that collects and stores water such as snowmelt water, rainwater, and water spray without flowing out of the site, watering means for watering the water in the storage tank to the site, and the geothermal water supply pipe Suitable for watering geothermal water to storage tank And a geothermal water replenishing means for replenishing.

  Further, as one aspect of the present invention, in order to reduce the geothermal water after circulating the geothermal water supply pipe into the aquifer without touching the outside air, a return port of the geothermal water supply pipe is provided. It arrange | positions so that it may become below the dynamic water level in the said exterior pipe | tube.

  Furthermore, as one aspect of the present invention, the storage tank includes a discharge strainer for discharging overflow water exceeding a predetermined water level to the outside, and an overflow reduction layer that permeates the overflow discharged from the discharge strainer into the formation. Surrounded by

  Furthermore, as one aspect of the present invention, the storage tank is a primary storage tank that initially stores collected water, and a separation weir that precipitates contaminants in the stored water in the primary storage tank, and separates the supernatant. A supernatant storage tank for storing the supernatant that has passed through the sorting weir, and the water in the supernatant storage tank is used as water for watering.

  ADVANTAGE OF THE INVENTION According to this invention, geothermal water can be utilized effectively for snow melting and road surface cooling, and the geothermal water to circulate can be returned to an aquifer as much as possible without touching outside air.

1 is a plan view showing an embodiment of a geothermal water environment conservation heat supply system according to the present invention. It is a cross-sectional view which shows 2A-2A cross section of FIG. It is a cross-sectional view showing an embodiment of the periphery of an outer tube when (a) a pumped-type pump is disposed below and (b) a suction-type pump is disposed within an interior tube. It is a cross-sectional view showing a 4A-4A cross section of FIG. It is a cross-sectional view which shows the example at the time of applying the geothermal water environment conservation type heat supply system of this embodiment to various sites. It is a cross-sectional view which shows the 6A-6A cross section of FIG. It is a transverse cross section showing an embodiment at the time of providing a faucet in a stored water supply pipe.

  Hereinafter, embodiments of a geothermal water environment conservation heat supply system according to the present invention will be described with reference to the drawings. FIG. 1 is a plan view showing the entire geothermal water environment conservation heat supply system 1 of the present embodiment. 2 is a cross-sectional view taken along 2A-2A in FIG.

  The geothermal water environment conservation heat supply system 1 of the present embodiment mainly includes an outer tube 2 embedded in the ground, and a geothermal water intrusion strainer 21 that infiltrates geothermal water into the outer tube 2. Geothermal water pumping pump 3 for pumping geothermal water, geothermal water supply piping 4 for circulating the geothermal water to a predetermined site F, and geothermal water for returning the geothermal water in the outer tube 2 to the aquifer L The reduction strainer 22, the storage tank 5 that collects and stores the water in the site F, the sprinkling means 6 that sprays the water in the storage tank 5, and the geothermal water from the geothermal water supply pipe 4 to the storage tank 5. It is comprised from the geothermal water replenishment means 7 which replenishes suitably.

  Hereinafter, each configuration of the present embodiment will be described in detail.

  The outer tube 2 is formed in a tubular shape, and is embedded from the ground surface to the aquifer L that holds geothermal water. The outer tube 2 is a tube having a circular or polygonal cross section, and may be bottomed or non-bottomed. The material may be appropriately selected from metal, concrete, resin and the like. The outer tube 2 in the present embodiment is formed in a substantially circular tubular shape with a bottom with a steel. In addition, a pump installation pit P for installing a geothermal water pumping pump 3 is provided in the vicinity of the ground surface where the outer tube 2 is buried, and a cover C is covered.

  The geothermal water intrusion strainer 21 allows the geothermal water of the aquifer L to enter the outer tube 2 and is installed at a position where the aquifer L exists. The geothermal water infiltration strainer 21 in the present embodiment includes a mesh-like filter that filters impurities such as gravel contained in the invading geothermal water.

  The geothermal water pumping pump 3 is a pump for pumping up geothermal water in the outer tube 2 and supplying it to the geothermal water supply pipe 4. A suction pump provided on the outer tube 2 is used as the geothermal water pumping pump 3 in the present embodiment. This geothermal water pumping pump 3 is installed in the pump installation pit P, and pumps up geothermal water in the vicinity of the lower end in the outer pipe 2 through the inner pipe 31. The inner pipe 31 is not particularly limited, but is preferably formed of a material having high heat insulation properties.

  In addition, the geothermal water pumping pump 3 is not limited to that of the present embodiment, and for example, a pumped pump disposed below the outer tube 2 as shown in FIG. Further, the location of the pump may be in the interior pipe 31 as shown in FIG.

  The geothermal water supply pipe 4 is a pipe having good thermal conductivity used for road heating or the like, and is buried so as to circulate in the ground of the predetermined site F or on the ground surface. In this embodiment, as shown in FIGS. 1 and 4, it is laid so as to be folded back substantially in parallel with the longitudinal direction of the site F.

  The geothermal water after circulating around the geothermal water supply pipe 4 is returned from the return port 41 into the exterior pipe 2. The return port 41 in the present embodiment always reduces the geothermal water to the aquifer L without changing the water quality such as oxidation of the geothermal water by keeping the geothermal water from touching the outside air as much as possible. It arrange | positions so that it may become the water level W or less.

  Specifically, the fluctuation of the dynamic water level W in the outer pipe 2 is measured in advance to identify the lower limit, and the surrounding environment such as the ground, aquifer conditions, climate, etc. The height at which the return port 41 of the hot water supply pipe 4 is arranged is provided to be lower than the lower limit of the dynamic water level W. Note that a water level sensor that measures the water level of the dynamic water level W may be provided so that the amount of geothermal water supplied can be controlled so as not to be lower than the return port 41.

  The site F is devised to collect and store snowmelt water, rain water, water sprayed from the water sprinkling means 6 and the like generated in the site F in the storage tank 5 so as not to flow out of the site. In the present embodiment, the collection groove D is constructed so as to surround the outer periphery of the site F. In addition, as shown in FIGS. 5A to 5B, the site F may be provided with an appropriate slope so that the water in the site F can be easily collected in the collection groove D. Further, the position of the collection groove D may be provided in the center in accordance with the inclination of the site F as shown in FIG. Further, although not shown, a drain outlet may be provided at the tip of the down slope of the site without providing the collecting groove D.

  The predetermined site F in which the geothermal water supply pipe 4 is embedded may be any location as long as the heat of the geothermal water can be suitably used, such as a general road, a parking lot, and an agricultural greenhouse. The site F of this embodiment consists of a road surface paved with asphalt.

  The geothermal water reduction strainer 22 is for reducing the geothermal water in the outer tube 2 after circulation to the aquifer L, and the position of the aquifer L above the geothermal water intrusion strainer 21. It is arranged. In the present embodiment, a mesh filter is provided in the same manner as the geothermal water intrusion strainer 21.

  The storage tank 5 is for storing the water collected by the collection groove | channel D as water for watering. As shown in FIG. 6, the storage tank 5 in the present embodiment is connected to the collection groove D so as to allow water to flow, and the primary storage tank 51 that initially stores the water collected by the collection groove D and the primary storage tank 51. A separation weir 52 that separates the supernatant by precipitating impurities in the storage water in the storage tank 51, a supernatant storage tank 53 that stores the supernatant that has passed the separation weir 52, and the collected water has exceeded a predetermined water level In some cases, a discharge strainer 54 for discharging the overflowing water to the outside is provided.

  The discharge strainer 54 is provided with a mesh-like filter and is provided at a position higher than the separation weir 52 so as to return the overflow water that cannot be stored in the supernatant storage tank 53 to the formation. .

  Further, the storage tank 5 is surrounded and buried by an overflow reduction layer 55 that permeates the overflow discharged from the discharge strainer 54 into the formation. The overflow reduction layer 55 is made of stone, sand, or the like, and facilitates reduction of overflow to the formation.

  The water sprinkling means 6 has a water sprinkling part 61 such as a sprinkler that sprinkles water in the site F, and a stored water supply pump 62 that supplies the water in the storage tank 5 to the water sprinkling part 61. In this embodiment, as shown in FIG. 1, a plurality of sprinklers are arranged in the site as the water sprinkling part 61. In addition, the stored water supply pump 62 in the present embodiment is disposed in the supernatant storage tank 53 and is connected to each sprinkler via the stored water supply pipe 63. The watering part 61 may be a spray nozzle or a structure having a plurality of holes formed in a circular pipe, and can be appropriately changed.

  The geothermal water replenishing means 7 is for supplying geothermal water from the geothermal water supply pipe 4 to the storage tank 5 when the water in the storage tank 5 is reduced below a predetermined amount. In the present embodiment, a floater-type water level meter 71 that automatically measures the water level of the supernatant storage tank 53 in the storage tank 5 shown in FIG. 6 according to the height of the float (floor), and the supernatant storage tank in the storage tank 5 And a geothermal water supply valve 72 that automatically opens when the water level of 53 is below a predetermined height.

  Next, the operation of each component will be described with reference to the drawings.

  As shown in FIG. 2, the geothermal water intrusion strainer 21 allows the geothermal water in the aquifer L to enter the outer tube 2 while being filtered by a filter. Here, the geothermal water entering the outer tube 2 is generally maintained at a substantially constant temperature throughout the year.

  The geothermal water pumping pump 3 pumps up the geothermal water in the outer tube 2 and supplies it to the geothermal water supply pipe 4 as a heat source. At this time, since the geothermal water is supplied through the highly heat-insulating inner pipe 31, it is supplied to the geothermal water supply pipe 4 while maintaining the temperature at the time of supply.

  The geothermal water supply pipe 4 circulates the geothermal water supplied by the geothermal water pumping pump 3 in the site F and exchanges heat with the site F. As described above, since geothermal water is kept substantially constant, it is lower than the outside temperature in the summer and higher than the outside temperature in the winter. Therefore, the supplied site F is warmed by geothermal water in the winter and can melt snow, and in the summer, the road surface can be cooled to prevent asphalt from dissolving.

  The geothermal water after circulating around the geothermal water supply pipe 4 is returned from the return port 41 into the exterior pipe 2 and is reduced to the aquifer L through the geothermal water reduction strainer 22. Since the position of the return port 41 is arrange | positioned below the dynamic water level W at this time, the geothermal water after a circulation is returned to the aquifer L, without touching outside air. Thereby, the activity by oxidation of geothermal water and the entrainment of air into geothermal water can be suppressed, and the quality of geothermal water can be preserved. Furthermore, since it is hard to rust and the growth of animals and plants is suppressed, the geothermal water environment conservation type heat supply system 1 can be maintained.

  As described above, in the geothermal water environment conservation type heat supply system 1 of the present embodiment, it is possible to extract only heat from the geothermal water and reduce it to the aquifer L without changing the water quality.

  Moreover, the geothermal water environment conservation type heat supply system 1 of this embodiment can also supply heat by watering.

  The water sprinkling means 6 sprinkles the water in the storage tank 5 into the site F as necessary. The stored water supply pump 62 of this embodiment supplies the water stored in the storage tank 5 to the sprinkler 61. And the sprinkling part 61 sprinkles the supplied water in a site.

  The water tank 5 collects water generated in the site F. The water collected here includes not only water sprinkled by the sprinkling means 6, but also snowmelt water, rainwater, and the like. In the present embodiment, the water collecting groove D provided around the site F collects the water sprinkled in the site F without flowing out of the site F.

  The water collected by the collecting groove D is poured into the primary storage tank 51 in the storage tank 5. In the primary storage tank 51, impurities in the stored water are precipitated by gravity and deposited on the bottom. The supernatant storage tank 53 stores the supernatant that has passed through the sorting weir 25. The water stored in the supernatant storage tank 53 is supplied to the sprinkler 61 by the stored water supply pump 62 and sprinkled as necessary.

  Further, the discharge strainer 54 of the storage tank 5 discharges water overflowing from the storage tank 5 to the overflow reduction layer 55. Here, the overflow reduction layer 55 assists the reduction by facilitating the penetration of the overflow water into the formation.

  The geothermal water supply means 7 supplies geothermal water as water for watering when the water in the storage tank 5 decreases from a predetermined amount and water for watering is insufficient. Specifically, the geothermal water supply valve 72 is actuated when the water level in the supernatant storage tank 53 in the storage tank 5 falls below a predetermined amount by the floater type water level gauge 71. The geothermal water supply valve 72 opens and supplies geothermal water from the geothermal water supply pipe 4 to the storage tank 5.

According to the geothermal water environment conservation type heat supply system 1 of the present embodiment as described above, the following effects can be obtained.
(1) Heating and cooling can be performed in a desired site F such as a road, a parking lot, and a greenhouse.
(2) By enabling water spraying to the site F, more effective heating and cooling can be performed.
(3) Even if sprinkling is performed, the total circulation amount of geothermal water does not decrease, so it will not be depleted, and geothermal water will be circulated without touching the outside air, so that the influence on water quality should be suppressed as much as possible. it can.
(4) When water for watering is insufficient, stable operation is ensured by supplying geothermal water.

  With these effects, for example, in the summer, the asphalt road surface can be cooled to prevent the asphalt from melting or a cooling effect in the city center can be expected. In winter, it can be melted at low cost on heavy snow days. Moreover, when used in a greenhouse for agricultural products, it becomes possible to water the water together with adjusting the room temperature.

  In addition, the geothermal water environment conservation type heat supply system according to the present invention is not limited to the above-described embodiment, and can be appropriately changed.

  For example, as shown in FIG. 7, a faucet 64 may be provided in the stored water supply pipe 62, and a hose, a movable watering part 61, or the like may be provided so that water can be sprayed at a pin point. Although not shown, a faucet may be provided in the geothermal water supply pipe 4.

  Moreover, when using as a snow melting apparatus, you may provide a snow accumulation sensor in the watering means 6 (not shown). Then, the snow accumulation sensor and the stored water supply pump 62 may be linked to automatically spray water from the sprinkling unit 61 when a certain amount of snow falls.

DESCRIPTION OF SYMBOLS 1 Geothermal water environmental conservation type heat supply system 2 Exterior pipe 3 Geothermal water pumping pump 4 Geothermal water supply piping 5 Storage tank 6 Sprinkling means 7 Geothermal water supply means 21 Geothermal water intrusion strainer 22 Geothermal water reduction strainer 31 Interior Pipe 41 Return port 51 Primary storage tank 52 Separation weir 53 Supernatant storage tank 54 Discharge strainer 55 Overflow reduction layer 61 Sprinkling section 62 Storage water supply pump 63 Storage water supply pipe 64 Faucet 71 Water level gauge 72 Geothermal water supply valve L Aquifer W Water level F Site D Collection groove P Pump installation pit C Lid

Claims (4)

An outer pipe buried from the surface to the aquifer holding geothermal water,
A geothermal water infiltration strainer that infiltrates the geothermal water of the aquifer into the outer tube;
A geothermal water pump for pumping geothermal water that has entered the outer pipe from the geothermal water infiltration strainer;
A geothermal water supply pipe for circulating the geothermal water pumped up by this geothermal water pumping pump to a predetermined site and using it as a heat source;
A geothermal water reduction strainer that circulates the geothermal water supply pipe and returns the geothermal water returned to the outer pipe to the aquifer,
A storage tank that collects and stores water such as snowmelt water, rainwater, and water sprinkling that occurs in the site without flowing out of the site;
Sprinkling means for sprinkling water of the storage tank to the site;
A geothermal water environment conservation type heat supply system comprising: geothermal water supply means for appropriately supplying geothermal water from the geothermal water supply pipe to the storage tank as water for watering.   The return port of the geothermal water supply pipe according to claim 1, wherein the geothermal water after circulating the geothermal water supply pipe is returned to the aquifer without touching outside air. A geothermal water environment conservation type heat supply system that is placed below the dynamic water level.   3. The overflow reduction layer according to claim 1 or 2, wherein the storage tank includes a discharge strainer for discharging overflow water exceeding a predetermined water level to the outside, and causes the overflow discharged from the discharge strainer to permeate into the formation. A geothermal water environment conservation heat supply system surrounded by   4. The storage tank according to claim 1, wherein the storage tank is a primary storage tank that first stores collected water, and a separation weir that precipitates impurities in the stored water in the primary storage tank and separates the supernatant. And a geothermal water environmental conservation type heat supply system that has a supernatant storage tank that stores the supernatant that has passed through the sorting weir, and uses water in the supernatant storage tank as water for watering.

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