JP2013249985A - Well hot spring heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a well hot spring heat exchanger enabling heat exchange between source water at high temperature and ordinary water with efficiency, without contact between hot water spring water and air.SOLUTION: A well hot spring heat exchanger includes a tubular sealing body 5 inserted toward a source, and a hot water lifting pump 7 arranged in the sealing body 5 so as to draw up a source water 1 from the source and to deliver it to the outside of the sealing body 5 via a hot water lifting pipe 9, and causes heat exchange to be performed between the source water 1 drawn up from the source to the hot water lifting pump 7 and fresh water in a water pipe 13 inserted to the vicinity of the source water 1, and the water pipe 13 is extended to the vicinity of the source.

Description

  The present invention includes a tubular sealed body inserted toward a source, and a hot water pump disposed in the sealed body so as to pump hot spring water from the source and discharge the hot spring water to the outside of the sealed body through a hot water pipe. , And a well hot spring heat exchange device that exchanges heat between hot spring water in the hot water pipe and water in the water pipe.

  Conventionally, the source water (hot spring water) that has springed up is pumped up and stored in the source tank on the ground, and is circulated between the source tank and the first pump, and the general water (water) is used as the primary water tank. Between the second circulation line that stores water and circulates between the primary water tank and the second pump, the source water that circulates in the first circulation line, and the general water that circulates in the second circulation line There is a hot spring heat recovery device (well hot spring heat exchange device) including a heat exchanger that performs heat exchange (see, for example, Patent Document 1).

JP-A-9-14750 (page 3, FIG. 1)

  However, in the well hot spring heat exchange device described in Patent Document 1, the source water (hot spring water) that has springed up is pumped up and stored in a ground source tank, and then the source tank and the first pump are used for heat exchange. Since the insoluble components in the source water (hot spring water) that springs up in the source tank react with oxygen in the air, it precipitates and settles, There has been a problem that the flow of the source water is obstructed by the deposits and deposits of these insoluble components adhering to the inner surface and the inner peripheral surface of the circulation pipe (heat exchanger) through which the hot spring water passes. Another problem is that the hot spring water pumped up from the source water and stored in the source tank on the ground has a temperature lower than the temperature of the source water, so that effective heat exchange cannot be obtained.

  The present invention has been made paying attention to such problems, and heat exchange is directly performed between the source water and the general water without touching the air. It is an object of the present invention to provide a well hot spring heat exchange device that can efficiently exchange heat with source water.

In order to solve the above problems, the well hot spring heat exchange device of the present invention is
A tubular sealed body inserted toward the source, and a hot water pump disposed in the sealed body so as to pump the source water from the source and discharge the source water to the outside of the sealed body through a hot water pipe. A well hot spring heat exchange device for exchanging heat between the source water pumped from the source to the hot water pump and the fresh water in the water pipe inserted to the vicinity of the source water,
The water pipe includes an inflow pipe whose tip extends from the ground through the tubular sealed body to the vicinity of the source spring, and a return pipe that is connected to the tip of the inflow pipe and extends to the ground through the sealed body. It is characterized by being composed.
According to this feature, the fresh water in the water pipe sent from the inflow pipe and turned back in the vicinity of the source spring and returned to the ground via the return pipe is always heated with the source water having a temperature close to the ground temperature pumped up by the hot water pump. Since it can be exchanged, it is possible to obtain hot water having a temperature higher than that of heat exchange on the ground. In addition, since fresh water in the water pipe does not directly contact the source water, it exchanges heat within the sealed body, so there is no need to use a source tank or heat exchanger for heat exchange on the ground. There is no possibility of deposits or deposits of these insoluble components on the inner peripheral surface of the vessel. Furthermore, since hot water can be made in the hot spring well, there is no need for space such as a roof.

Well hot spring heat exchange device of the present invention,
The water pipe is provided with a turning means for giving a turning motion to fresh water flowing in the water pipe.
According to this feature, fresh water in the water pipe moves while swirling in the pipe by the swiveling means, so that the temperature of the fresh water can be made uniform and heat exchange can be performed efficiently.

Well hot spring heat exchange device of the present invention,
The fresh water in the inflow pipe is obtained by feeding fresh water stored in a water storage tank by a water supply pump, and is configured to return to the hot water storage tank through the return pipe.
According to this feature, hot water at a predetermined temperature can be obtained in the hot water storage tank in a short time.

Well hot spring heat exchange device of the present invention,
The inflow pipe and the return pipe in the sealed body are fixed to a buoyancy pipe.
According to this feature, since the weight of the inflow pipe and the return pipe is reduced by the buoyancy pipe, the water pipe can be easily constructed and repaired.

It is the schematic which shows the principal part of the well hot spring heat exchange apparatus in an Example. These are the detailed drawing of the heat exchange part and pumping part of a well hot spring heat exchange apparatus, and the enlarged view of the front-end | tip of a heat exchange part. 2A is a plan view of FIG. 2, and FIG. 2B is an sectional view taken along the line A in FIG. (A) is II sectional drawing of the enlarged view of the heat exchange part front-end | tip of FIG. 2, (b) is sectional drawing of a buoyancy pipe. It is related detailed drawing with the pumping-up part and storage tank part of a well hot spring heat exchange apparatus. It is the schematic which shows the modification of a well hot spring heat exchange apparatus.

  EMBODIMENT OF THE INVENTION The form for implementing the well hot spring heat exchange apparatus which concerns on this invention is demonstrated below based on an Example.

  The well hot spring heat exchanger according to the embodiment will be described with reference to FIG. 1 is a source part heated to about 30 ° C. to 150 ° C. by geothermal heat or the like at a depth of 1000 m to 1500 m from the ground surface, and the source water from the source part A pumped up by the pumping part C is Supplied to ground water heaters.

  On the other hand, fresh water of about 0 ° C. to 20 ° C. is supplied from the ground to the vicinity of the source portion A through a water pipe by a pump, and then returns to the ground again to be stored in the storage tank portion D. And since the pumping part C and the source part A are surrounded by the sealed part E, the source water is always pumped up through the sealed part E while the pumped part C is operated by the pump. The fresh water in the water pipe extending to the vicinity is heat-exchanged in the source water flowing between the pumping section C and the source section A and the heat exchanging section B, becomes hot water, and can be returned to the storage tank section D for hot water storage. . The hot water stored in the storage tank D is taken to a bath, shower, snow melting, warm floor, warm floor, laundry, or a farm, a warm vegetable garden in winter, and used depending on the application.

  FIG. 2 is a detailed view of the heat exchanging section B and the pumping section C of the well hot spring heat exchanging device, and the tubular sealed section E inserted into the hot spring well 3 excavated by an excavator or the like toward the source spring section A A sealed body 5 as an outer casing, and a hot water pump 7 that is disposed in the sealed body 5 and pumps hot source water 1 in which sulfur, calcium, silicon, iron, manganese, etc. are dissolved from the source section A. And an inner casing 11 surrounding a pumped water pipe 9 for supplying the pumped source water 1 to a hot water supply facility or the like on the ground. A water pipe 13 is provided for supplying fresh water that extends to the vicinity and returns to the ground.

  The sealing body 5 is formed in a long length of about 1200 to 1300 meters in the present embodiment, and the lower end portion is arranged in the source spring part A by being inserted into the hot spring well 3, and from the source part A. It is sealed so that it does not come into contact with air while the source water 1 is pumped up. In addition, a plurality of hot water outlets 5 a through which the source water 1 communicating with the inside and the outside of the sealed body 5 can flow is formed at the lower end of the sealed body 5.

  The water pipe 13 passes through between the upper casing 5-1 and the inner casing 11 constituting the upper part of the sealed body 5 from the ground, and further extends to the heat exchanging part B to the hot water outlet 5a near the source part A and sends out fresh water. And an inflow pipe 13a for communicating with the front end of the inflow pipe 11a and turning back, passing between the heat exchanging portion B, the upper casing 5-1 and the inner casing 11, and extending out of the sealed body 5 to the ground. It is composed of a single pipe composed of a return pipe 13b for transferring the hot water of the fresh water heat-exchanged to the disposed storage tank section D.

  The inner casing 11 that surrounds the outer periphery of the pumping section C composed of the hot water pump 7 and the pumping pipe 9 has a diameter of about 150 mmφ, and as shown in FIG. A return pipe 13b having a diameter of 50 mmφ is arranged in the same manner as the inflow pipe 13a having a diameter of 50 mmφ, and an upper casing 5-1 having a diameter of 300 mmφ surrounds the pumping section C over about 100 meters. It is inserted in the hot spring well 3 as you do.

  As shown in FIG. 2, the hot water pipe 9 extending to the outside of the upper casing 5-1 is connected via a check valve 15 and a manual valve 17 to a water supply pipe 19 that directly supplies source water to a hot water supply facility or the like. In addition, an automatic air vent valve 21 for discharging the air in the hot water pipe 9 to the outside of the hot water pipe 9 and preventing the inflow of air into the hot water pipe 9 is provided at the uppermost end of the hot water pipe 9. Is provided. Further, an air vent device (not shown) communicating with the outside of the inner casing 11 is connected above the water surface H of the source water 1 in the inner casing 11, and the air vent device removes air from the inner casing 11. The upper side of the water surface of the hot spring water 1 in the inner casing 11 is evacuated to prevent the source water 1 in the inner casing 11 from coming into contact with oxygen in the air.

  In addition, an automatic anaerobic discharge valve (not shown) that discharges anaerobic gas that does not contain oxygen such as hydrogen sulfide and sulfur dioxide generated from the source water 1 in the inner casing 11 to the outside of the inner casing 11 is provided at the upper end of the inner casing 11. Is provided. For this reason, even if anaerobicity arises from the source water 1 in the inner casing 11, the anaerobic air is compressed upward from the water surface of the source water 1 in the inner casing 11 by discharging this anaerobic from the automatic anaerobic discharge valve at any time. To prevent it from filling up.

  The intermediate casing 5-2 which is continuous to the lower part of the upper casing 5-1 of the sealed body 5 and is constructed in the heat exchanging section B is reduced in diameter to about 150 mmφ and surrounds the inflow pipe 13a and the return pipe 13b to about 500. It is inserted into hot spring well 3 with a length of meters. Therefore, as shown in FIG. 3B, the inflow pipe 13a and the return pipe 13b are bent inward from the upper casing 5-1 toward the intermediate casing 5-2, and penetrated and fixed to the lower portion of the inner casing 11. The bent portions of the inflow pipe 13a and the return pipe 13b are inserted into the lower casing 5-3 that extends further downward through the intermediate casing 5-2.

  The lower casing 5-3 extends downward about 300 meters to a position where the inflow pipe 13a and the return pipe 13b shown in the enlarged view of FIG. 2 are folded back. And the front-end | tip of the lower casing 5-3 is further extended from 200 meters to 300 meters as the strainer 23 in which the hot water intake 5a was formed. The buoyancy pipe 10 is fixed between the inflow pipe 13a and the return pipe 13b.

  The buoyancy pipe 10 has a length of about 5 to 10 meters, the diameter is substantially the same as the inflow pipe 13a and the return pipe 13b, and two buoyancy pipes 10 flow in as shown in FIG. It fixes by welding between the pipe | tube 13a and the return pipe 13b, and the welding location is provided in multiple places in the range of the heat exchange part B by the weight at the time of installation. Both ends of the buoyancy pipe 10 are sealed as shown in FIG. 4B, and air of a predetermined pressure is sealed inside. Thereby, since the weight of the inflow pipe 13a and the return pipe 13b is reduced by the buoyancy pipe, the operation at the time of construction and repair of the water pipe becomes easy.

  Next, the effect | action of the heat exchange part B is demonstrated based on FIG.2 and FIG.3. Fresh water supplied from the ground side to the inflow pipe 13a by using a pump passes through the manual valve 23 and the check valve 25, between the upper casing 5-1 and the inner casing 11, between the intermediate casing 5-2 and the lower casing 5-. 2 flows down to the return pipe 13b which is folded back in an arc shape at the tip and communicated with the inflow pipe 13a as shown in the partially enlarged view of FIG. And it returns to the ground through the lower casing 5-3, the intermediate casing 5-2, the upper casing 5-1 and the return pipe 13 b disposed in the inner casing 11.

  The fresh water descending in the inflow pipe 13a is heat-exchanged in the heat exchange section B by the source water 1 pumped from the source section A by the operation of the hot water pump 7, and becomes hot water, and this heat exchange is also performed in the return pipe 13b. Then, it passes through the return pipe 13b disposed between the upper casing 5-1 and the inner casing 11, and is returned to the storage tank section D through the check valve 27 and the manual valve 29 provided on the ground.

  When the source water 1 is pumped up from the source part A by the operation of the hot water pump 7, the source water 1 is pumped through the lower casing 5-3 and the intermediate casing 5-2 constituting the heat exchange part B from the hot water outlet 5a. Since it is sucked into the pump 7 and transferred from the hot water supply pipe 9 to the water supply pipe 19, in the heat exchanging section B, fresh water is always heat-exchanged with the source water 1 having a temperature close to the ground temperature, so Compared with conventional heat exchange for heat exchange, hot water having a higher temperature can be obtained. Since hot water can be made in the hot spring well in this way, there is an advantage that a space such as a roof is not required. Moreover, heat exchange is possible only by extending the water pipe 13 to the heat exchange part B, and it is not necessary to provide a special heat exchanger.

  The pipe of the most suitable material is selected for the water pipe 19 depending on the quality of the hot spring such as stainless steel and GFRP (glass fiber reinforced plastic). However, the water pipe 13 is a material considering the quality of the hot spring since it does not mix with the source water. Need not be selected, and a stainless steel pipe, a steel pipe, a titanium steel pipe, or the like can be used. On the other hand, it is preferable that the outer peripheral surfaces of the inflow pipe 13a and the return pipe 13b exposed to the ground part are pipes wrapped with a heat insulating material such as glass wool or phenol foam in consideration of heat loss.

  The water pipe 13 is provided with a turning means 31 for turning the fresh water 1 in the pipe. The swirling means 31 is composed of a plurality of spiral ribs provided at regular intervals in the circumferential direction of the inner wall of the water pipe 13. When the fresh water 1 passes through the swirling means 31, a swirling flow is generated, heat is exchanged, and heating is performed. The temperature of the fresh water thus made becomes uniform, and heat exchange can be performed efficiently. In addition, instead of the spiral rib provided on the inner wall of the pipe, the swiveling means may be a water turbine that is rotated by a water flow and that is rotatably mounted in the pipe.

  Next, the related structure with the pumping part C and the storage tank part D of a well hot spring heat exchange apparatus is demonstrated based on FIG. Water supply to the inflow pipe 13 a is performed by pumping up fresh water of about 0 ° C. to 20 ° C. stored in the water storage tank 34 by the water supply pump 41. And as explained previously, it returns to the hot water storage tank 33 from the return pipe 13b through the outer peripheral part of the pumping part C and the heat exchange part B through the inflow pipe 13a.

  The hot water storage tank 33 formed of a casing wrapped with a heat insulating material is composed of a regular hot water storage tank 33-1 for storing hot water during the day and a relatively hot auxiliary hot water storage tank 33-2 for storing hot water at night. -1 and the auxiliary hot water storage tank 33-2 are provided with thermometers 35 for detecting the temperatures of the bottom surface and the top surface of the tank, respectively, and fresh water heated by the heat exchanging section B is first supplied from the return pipe 13b. Hot water is selectively stored in the common hot water tank 33-1 via the return pipe 13b-1 or in the auxiliary hot water tank 33-2 via the second return pipe 13b-2.

  The first return pipe 13b-1 and the second return pipe 13b-2 are respectively provided with manual adjustment valves 36-1, 36-2 and motor operated valves 38-1, 28-2. The normal hot water storage tank 33 passes through the first return pipe 13b-1 and the second return pipe 13b-2 by adjusting the flow rate of fresh water flowing through the water pipe 13 by adjusting the valve opening degree of 36-1, 36-2. -1 or the temperature of hot water stored in the auxiliary hot water storage tank 33-2 can be adjusted.

  In addition, an automatic adjustment valve is used in place of the manual adjustment valve, and the temperature from the thermometer 35 is taken into an unillustrated control device as an input signal, and the valve opening of the automatic adjustment valve is made variable based on the input signal. It is also possible to keep the hot water stored in the hot water storage tank 33-1 or the auxiliary hot water storage tank 33-2 at a predetermined temperature.

  In general, since the amount of hot water used is large during the day, the valve opening of the manual adjustment valve 36-1 provided in the first return pipe 13b-1 is increased, and hot water of 43 ° C. to 45 ° C. is used for regular hot water storage. Hot water is stored in the tank 33-1 and can be used by the hot water supply pump 39 for bathing, showering, melting snow, warming the floor, hotbed or washing. At this time, the electric valve 38-2 provided in the second return pipe 13b-2 is closed. Since the amount of hot water used is small at night, the valve opening of the manual adjustment valve 36-2 is narrowed and hot water of about 50 ° C to 60 ° C or more is stored and used as hot water. It can be used as hot water supply for many days. At this time, the motor operated valve 38-1 provided in the first return pipe 13b-1 is closed.

  As shown in FIG. 6, a hot water supply pipe 40 that supplies high temperature water to a demand point from a hot water supply pump 39 provided in the auxiliary hot water storage tank 33-2 is connected to a supply pipe 51 provided with a three-way switching valve 49, for example, a temperature drop The hot water in the auxiliary hot water tank 33-2 that has been removed can also be rapidly heated.

  In this case, the flow of water supplied from the hot water supply pipe 40 to the demand point is switched by the three-way switching valve 49 to the supply pipe 51, and the hot water whose temperature is lowered in the auxiliary hot water tank 33-2 by driving the hot water supply pump 39 is supplied to the inflow pipe. It is made to flow to the 13a side. At this time, a check valve 44 that allows only the flow from the water supply pump 41 to the inflow pipe 13a is provided in the water supply pipe 13a-1 so that the hot water from the supply pipe 51 toward the inflow pipe 13a does not flow into the water storage tank 34.

  Then, the hot water whose temperature has decreased from the auxiliary hot water storage tank 33-2 that has flowed to the inflow pipe 13a side can be heat-exchanged in the heat exchanging section B and returned to the auxiliary hot water storage tank 33-2. By repeating, although there is a difference depending on the temperature of the source spring, a relatively high temperature hot water of about 30 ° C. to 85 ° C. is rapidly stored in the auxiliary hot water storage tank 33-2. When the required high-temperature water is obtained, the three-way switching valve 49 is returned to its original position, and the flow connection between the inflow pipe 13a and the hot water supply pump 39 is disconnected.

  As described above, the well hot spring heat exchanging device in the present embodiment has the tubular sealed body 5 inserted toward the source, and the source water 1 is pumped from the source and discharged to the outside of the sealed body 5 through the hot water pipe 9. A hot water pump 7 disposed in the sealed body 5, and the source water 1 pumped up from the source to the hot water pump 7, and fresh water in the water pipe 13 inserted to the vicinity of the source water, The water pipe 13 is connected to the front end of the inflow pipe 13a through an inflow pipe 13a extending from the ground through the tubular sealing body 5 to the vicinity of the source spring. And the return pipe 13b extending to the ground through the inside of the sealed body 5, so that the inside of the water pipe 13 sent from the inflow pipe 13a is folded back in the vicinity of the source spring and returned to the ground via the return pipe 13b. Fresh water is pumped up by a hot water pump 7 Always heat exchange with the source water 1 high temperature close to the bottom temperature. In addition, since the true body in the water pipe 13 exchanges heat in the sealed body 5 without directly contacting the source water 1, it is not necessary to use a source tank or heat exchanger for heat exchange provided on the ground. There is no possibility of deposits of these insoluble components and deposits on the inner surface of the heat exchanger and the inner peripheral surface of the heat exchanger. Furthermore, since hot water can be made in the hot spring well, there is no need for space such as a roof.

  Further, in the well hot spring heat exchange apparatus according to the present embodiment, the water pipe 13 is provided with the swirling means 31 for imparting a swirling motion to the fresh water flowing in the water pipe 13, so that the temperature of the fresh water can be made uniform and heat exchange can be performed efficiently. It can be performed.

  Further, in the well hot spring heat exchanger in this embodiment, the fresh water in the inflow pipe 13a is obtained by feeding the fresh water stored in the water storage tank 34 by the water supply pump 41, and is supplied to the hot water storage tank 33 through the return pipe 13b. Since it is comprised so that it may return, the hot water of predetermined temperature can be obtained in the hot water storage tank 33 in a short time.

  Moreover, since the inflow pipe | tube 13a and the return pipe | tube 13b in the said sealing body 5 are being fixed to the buoyancy pipe 10 in the well hot spring heat exchange apparatus in a present Example, the weight of the inflow pipe | tube 13a and the return pipe | tube 13b is buoyancy pipe. 10 and the operation at the time of construction and repair of the water pipe becomes easy.

  Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to these embodiments, and modifications and additions within the scope of the present invention are included in the present invention. It is.

  For example, the number of swiveling means 31 and the arrangement length of the sealed body 5 inserted into the ground are appropriately set according to conditions such as the temperature of the source water and the length of the heat exchange part B.

  Moreover, although the diameter of the inflow pipe and the return pipe is 50 mmφ, it is not particularly limited to this diameter, and for example, those having a diameter of 30 mmφ or 80 mmφ may be used.

  Moreover, although the storage tank 33 is comprised by two, the hot water storage tank 33-1 and the auxiliary hot water storage tank 33-2, only the common hot water storage tank 33-1 may be sufficient and it may be made to provide two or more hot water storage tanks. good.

  In addition, the buoyancy pipe 10 has been described as an example in which two buoyancy pipes 10 are used between the inflow pipe 13a and the return pipe 13b. However, the number of buoyancy pipes 10 may be one, or two or more may be used. What is necessary is just to weld several places at intervals according to the length of the heat exchange part B. FIG.

  Further, when the temperature of the source water is relatively high or the water level (the water level H of the pumping section C) is high, the water is pumped by the hot water pump 7 and a new heat source is always used. A relatively large amount of hot water can be easily obtained by setting a plurality of inflow pipes and return pipes having a diameter of 50 mmφ in the upper casing 5-1 that surrounds the pumping section C over a meter. it can.

1 Hot spring water 5 Sealed body
7 Hot water pump 9 Hot water pipe 10 Buoyancy pipe 13a Inflow pipe (water pipe)
13b Return pipe (water pipe)
31 Rotating means 33-1 Common hot water storage tank 33-2 Auxiliary hot water storage tank 41 Water supply pump 51 Supply pipe A Hot spring part B Heat exchange part C Pumping part D Storage tank part E Sealed part

Claims (4)

A tubular sealed body inserted toward the source, and a hot water pump disposed in the sealed body so as to pump the source water from the source and discharge the source water to the outside of the sealed body through a hot water pipe. A well hot spring heat exchange device for exchanging heat between the source water pumped from the source to the hot water pump and the fresh water in the water pipe inserted to the vicinity of the source water,
The water pipe includes an inflow pipe whose tip extends from the ground through the tubular sealed body to the vicinity of the source spring, and a return pipe that is connected to the tip of the inflow pipe and extends to the ground through the sealed body. Well hot spring heat exchange device characterized by being configured.   2. The well hot spring heat exchange device according to claim 1, wherein the water pipe is provided with swirling means for swirling movement of fresh water flowing in the water pipe.   The fresh water in the inflow pipe is obtained by feeding fresh water stored in a water storage tank by a water supply pump, and is configured to return to the hot water storage tank through the return pipe. The well hot spring heat exchange device according to 2.     The well hot spring heat exchanger according to any one of claims 1 to 3, wherein the inflow pipe and the return pipe in the sealed body are fixed to a buoyancy pipe.

Images