Subsurface storage facility and method for using subsurface storage facility

Abstract

To provide a subsurface storage facility that can improve the economic efficiency of CCS and allows stable operation of CCS.SOLUTION: A subsurface storage facility 1 comprises: a subsurface storage system 10 including an injection well 11 for injecting carbon dioxide from the surface into a subsurface aquifer 2, and a production well 12 for pumping up hot water from the aquifer 2 to the surface; a power generation system 30 that generates electricity using the hot water; and a resort facility 40 (building) which receives electricity from the power generation system 30.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an underground storage facility and a method for using the underground storage facility. [Background technology]

[0002] As a measure against global warming, there is Carbon Dioxide Capture and Storage (CCS), which separates and captures carbon dioxide (CO2) from exhaust gases emitted by steelworks, power plants, etc., and stores the carbon dioxide underground. In CCS, carbon dioxide is injected from above ground through injection wells into an underground aquifer. When carbon dioxide is injected into an aquifer, the pressure inside the aquifer increases, but the increase in pressure inside the aquifer can be suppressed by pumping groundwater from the aquifer to the surface through production wells (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2010-142754 A Summary of the Invention [Problem to be solved by the invention]

[0004] The above-mentioned CCS is difficult to operate stably because of the high costs involved in capturing carbon dioxide from exhaust gases and the atmosphere, and in transporting the carbon dioxide. Therefore, an object of the present invention is to provide a geological storage facility and a method for using the geological storage facility that can improve the economic efficiency of CCS and enable stable operation of CCS. [Means for solving the problem]

[0005] In order to solve the above-mentioned problems, a first invention is an underground storage facility comprising: an underground storage equipment having an injection well for injecting carbon dioxide from above ground into an underground aquifer and a production well for pumping hot water from the aquifer to the surface; a power generation equipment that generates electricity using the hot water; and a building to which electricity is supplied from the power generation equipment. In order to solve the above-mentioned problems, the second invention is a method for utilizing an underground storage facility, in which carbon dioxide is injected from above ground through an injection well into an underground aquifer, and hot water from the aquifer is pumped to the surface through a production well, and the hot water is used to generate electricity in a power generation facility, which then supplies electricity to a building. In this invention, carbon dioxide in the atmosphere can be reduced by storing carbon dioxide captured from exhaust gas or the atmosphere in an underground aquifer. In addition, in this invention, a pressure increase in the aquifer can be prevented by pumping up hot water from the aquifer. Furthermore, in the present invention, various buildings such as resort facilities are built near the underground storage facility, and electricity generated using hot water is supplied to the buildings. In this way, the present invention can improve the economic efficiency of CCS by linking the operation of the CCS with the operation of the buildings.

[0006] In the underground storage management facility, it is preferable to provide a water supply facility for supplying the hot water to the building, so that the hot water can be used in the building's bathing facilities, hot water pool, and the like. In the above-mentioned underground storage management facility, it is preferable to install a monitoring device for detecting the concentration of carbon dioxide in the building to manage the safety of the CCS. In the above-mentioned underground storage management facility, it is preferable to provide a seismic isolation device in the building to improve the earthquake resistance of the building. In the above-mentioned geological storage management facility, it is preferable to provide facilities for observing the geological storage equipment to enhance understanding of CCS. Effect of the Invention

[0007] This invention makes it possible to reduce carbon dioxide in the atmosphere, and furthermore, by supplying electricity generated using hot water pumped from the aquifer to buildings, it is possible to prevent a pressure increase within the aquifer, improve the economic efficiency of CCS, and enable stable operation of the CCS. [Brief description of the drawings]

[0008] [Figure 1] 1 is a configuration diagram showing an underground storage facility according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a configuration diagram showing an underground storage facility according to an embodiment of the present invention. As shown in FIG. 1, the underground storage facility 1 includes an underground storage facility 10, a water supply facility 20, a power generation facility 30, and a resort facility 40. The underground storage facility 1 of this embodiment is used for CCS, which separates and captures carbon dioxide (CO2) from exhaust gas discharged from steel mills, power plants, and the like, and stores it in an underground aquifer 2. The aquifer 2 is a stratum deep underground made of sandstone, etc. An impermeable layer through which water does not easily flow is layered on top of the aquifer 2, and the aquifer 2 is filled with groundwater. The underground storage facility 1 of this embodiment is installed in an area where the geothermal temperature is high and the aquifer 2 is filled with hot water (groundwater) at about 90 degrees.

[0010] The underground storage facility 10 has an injection well 11, a production well 12, and an observation facility 13. The injection well 11 is a well for injecting carbon dioxide into the aquifer 2, and reaches the aquifer 2 from the ground. A supply pipe 14 is connected to the upper end of the injection well 11. The supply pipe 14 is an air (liquid) supply pipe for sending carbon dioxide to the injection well 11. The carbon dioxide in the injection well 11 is injected into the aquifer 2 from a perforated portion formed at the lower end of the injection well 11. The production well 12 is a well for pumping up the hot water in the aquifer 2 to the surface, and reaches the aquifer 2 from the ground. The hot water in the aquifer 2 flows into the production well 12 from a perforated portion formed at the lower end of the production well 12. In this embodiment, in order to suppress a drop in the temperature of the hot water in the production well 12, a heat insulating material is provided on the peripheral wall of the production well 12. The observation facility 13 is a facility that exhibits information related to CCS, such as the structure and operating status of the injection well 11 and production well 12.

[0011] The water supply facility 20 includes a water supply pipe 21 installed on the ground. One end of the water supply pipe 21 is connected to the upper end of the production well 12. The other end of the water supply pipe 21 is connected to a power generation facility 30 and a resort facility 40, which will be described later. Hot water is sent from the production well 12 to the water supply pipe 21. The hot water is then sent to the power generation facility 30 and the resort facility 40 by a pump (not shown) provided in the water supply pipe 21.

[0012] The power generation facility 30 has a binary system power generation device that generates power using hot water. Hot water is sent to the power generation facility 30 through the water supply pipe 21. In the power generation facility 30, the hot water boils a working medium such as ammonia water or a fluorocarbon alternative, and the resulting steam drives a turbine (not shown) to generate power. For example, when 23.26 million tons of carbon dioxide are injected into the aquifer 2 over a 25-year period, it is expected that 22.22 million tons of hot water will be pumped from the aquifer 2. In this case, if the hot water is at 90 degrees, the power generation facility 30 can generate 775 million kWh of electricity through binary power generation.

[0013] The resort facility 40 is a building that has various facilities such as accommodation facilities, a golf course, a ski resort, an amusement park, and a campground. Electricity is supplied to the resort facility 40 from the power generation facility 30 through a power transmission line 31. In the resort facility 40, various electrical appliances are operated by electricity generated using hot water pumped from the aquifer 2. Hot water is also supplied to the resort facility 40 through the water supply pipe 21. In the resort facility 40, the temperature of the hot water is adjusted and used as hot water for bathing facilities, a hot water pool, tap water, etc. The hot water can also be used for heating.

[0014] The resort facility 40 is also provided with monitoring devices 41 that detect the concentration of carbon dioxide. The monitoring devices 41 are installed in various locations in the resort facility 40. The monitoring device 41 is configured to display the measurement results obtained by the carbon dioxide concentration detector on a display means such as a monitor. This makes it easier for users of the resort facility 40 to understand the carbon dioxide concentration. In this way, the safety of the CCS is managed. Various structures within the resort facility 40 are provided with seismic isolation devices 42 such as bearings and dampers, thereby improving earthquake resistance. In addition, seismometers 43 are installed at various locations within the resort facility 40.

[0015] Next, a method for using the underground storage facility 1 of this embodiment will be described. Carbon dioxide separated and captured from exhaust gases emitted from steelworks, power plants, and the like and from the atmosphere is sent to an injection well 11 through a supply pipe 14. The carbon dioxide in the injection well 11 is injected into the aquifer 2 from the lower end of the injection well 11. In addition, in conjunction with the injection of carbon dioxide from the injection well 11 into the aquifer 2, hot water within the aquifer 2 is pumped up through the production well 12. The hot water is supplied to the power generation facility 30 and the resort facility 40 through a water supply pipe 21. The power generation facility 30 uses the hot water to generate electricity, which is then supplied to a resort facility 40 . In the resort facility 40, various electrical appliances are operated using the power supplied from the power generation facility 30. In addition, in the resort facility 40, the hot water is used as hot water for bathing facilities, a hot water pool, tap water, etc.

[0016] In the above-described underground storage facility 1 and method of using an underground storage facility, carbon dioxide in the atmosphere can be reduced by storing carbon dioxide captured from exhaust gas or the atmosphere in the underground aquifer 2. In this way, reducing greenhouse gases can prevent global warming. Furthermore, in the underground storage facility 1 and the method of using the underground storage facility of the present embodiment, it is possible to prevent a pressure rise in the aquifer 2 by pumping up hot water from within the aquifer 2. This makes it possible to prevent the impact of a pressure rise in the aquifer 2 on the ground. Furthermore, in the underground storage facility 1 and the method of using an underground storage facility of this embodiment, a resort facility 40 is provided near the underground storage facility 10, and electricity generated using hot water is supplied to the resort facility 40. By linking the operation of the CCS with the operation of the resort facility 40 in this way, the economic efficiency of the CCS can be improved and the CCS can be operated stably. Furthermore, in the geological storage facility 1 of this embodiment, the geological storage equipment 10 is provided with a tour facility 13, which can enhance understanding of CCS.

[0017] Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and can be appropriately modified without departing from the spirit of the present invention. For example, in the underground storage facility 1 of this embodiment, the power generation facility 30 generates electricity using hot water pumped from the production well 12 and supplies the electricity to the resort facility 40, but the buildings to which the power generation facility 30 supplies electricity are not limited. For example, electricity can be supplied to various buildings such as factories, office buildings, schools, and commercial facilities. [Explanation of symbols]

[0018] 1. Underground storage facilities 2 Aquifer 10. Underground storage facilities 11 Injection well 12 Production wells 13. Visitor facilities 14 Supply pipe 20 Water supply equipment 21 Water pipe 30 Power generation facilities 31 Power Lines 40 Resort facilities (buildings) 41 Monitoring Equipment 42 Seismic isolation device 43 Seismograph

Claims

1. an underground storage facility having an injection well for injecting carbon dioxide from above ground into an underground aquifer and a production well for pumping hot water from the aquifer to the above ground; A power generation facility that generates electricity using the hot water; and a building to which electricity is supplied from the power generation equipment.

2. 2. The underground storage facility according to claim 1, further comprising a water supply facility for supplying the hot water to the building.

3. 2. The underground storage facility according to claim 1, wherein the building is provided with a monitoring device for detecting a concentration of carbon dioxide.

4. 2. The underground storage facility according to claim 1, wherein the building is provided with a seismic isolation device.

5. 2. The underground storage facility according to claim 1, further comprising facilities for permitting a tour of the underground storage facility.

6. A method for utilizing an underground storage facility, comprising the steps of injecting carbon dioxide from above ground through an injection well into an underground aquifer, pumping hot water from the aquifer to the surface through a production well, using the hot water to generate electricity in a power generation facility, and supplying electricity from the power generation facility to a building.

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