JP3975437B2 - High pressure gas storage facility - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a high-pressure gas storage facility for storing high-pressure gas in a storage tank installed in a rock or ground.
[0002]
[Prior art]
As is well known, high-pressure gas storage facilities that use a high-pressure gas such as natural gas in a bedrock or a cavity formed in the ground have recently been realized. In this high-pressure gas storage facility, the inner wall of the cavity formed in the rock or the ground is covered with a lining material, and a backfilling material is interposed between the inner wall and the lining material, so that the space inside the lining material Is used as a storage tank for storing high-pressure gas. Such a facility is effective in that it can store high-pressure gas in a large amount and safely, and does not impair the landscape on the ground.
[0003]
By the way, in the high-pressure gas storage facility as described above, it is necessary to detect leakage of the high-pressure gas stored in the storage tank to the outside in order to safely store the high-pressure gas for a long period of time. Therefore, conventionally, the periphery of the storage tank is covered with a drain pipe having a plurality of holes, and the plurality of drain pipes are connected to a gas collecting pipe provided on the outer periphery of the upper section of the storage tank. Further, the gas collecting pipe is connected to a gas discharge pipe provided inside a top tunnel portion formed above the storage tank. In this way, leakage of high-pressure gas is detected by measuring the pressure inside the drainage system constituted by the drainage pipe, the gas collection pipe, and the gas discharge pipe. That is, in a high-pressure gas storage facility provided with this drainage system, the drain pipe is usually filled with groundwater, and if the high-pressure gas leaks from the storage tank, the high-pressure gas enters the drain pipe and then gas from there. After collecting air, it reaches the gas exhaust pipe and is discharged outside. The change of the pressure in the drain pipe at this time is grasped, and the leakage of the high-pressure gas stored in the storage tank to the outside is detected.
[0004]
[Problems to be solved by the invention]
However, the conventional methods as described above have the following problems. First, when even a slight amount of gas is present in the drain pipe, the change in pressure in the drain pipe cannot be accurately grasped, so that the accuracy of leak detection decreases. Also, especially when there is no groundwater, the drainage pipe is not filled with water, and the accuracy of leak detection of high-pressure gas stored in the storage tank by pressure measurement is extremely reduced. Gas detection was not possible.
[0005]
The present invention takes the above-mentioned problems into consideration and reliably detects the leakage of the high-pressure gas stored in the storage tank, and when there is a slight amount of gas in the drain pipe or groundwater The purpose is to detect leakage of high-pressure gas stored in the storage tank even when it does not exist.
[0006]
[Means for Solving the Problems]
The high pressure gas storage facility according to claim 1, wherein the inner wall of the cavity formed in the rock or the ground is covered with a lining material, and a backfilling material is interposed between the inner wall and the lining material, A high-pressure gas storage facility that uses the inner space of the lining material as a storage tank for storing high-pressure gas,
A drainage body formed by a drain pipe arranged between the inner wall and the backfilling material and having a plurality of holes on the outer peripheral surface, and connected to the drainage body via a connection pipe, and a gas amount on the side portion A cylindrical gas detector tube with a scale for measuring the gas and sealed at the upper end, and a component analysis of gas accumulated in the gas detector tube connected to the gas detector tube via a connecting tube And the inside of the drainage body, the connection pipe, and the gas detection pipe is filled with water.
[0007]
Due to these features, when leakage of high-pressure gas stored in the storage tank occurs, the leaked gas enters the drainage body from the drainage pipe, reaches the gas detection pipe via the connection pipe, and is filled with water. A gas pool is generated in the gas detector tube. The amount of the leaked gas accumulated in the gas detector tube is measured by a scale attached to the gas detector tube, and the component of the leaked gas accumulated in the gas detector tube is connected to the gas detector tube via a connecting tube. Analyzed by a gas detector. In this way, the gas component in the drainage body is directly measured by the gas detector.
[0008]
High pressure gas storage facility according to claim 2, there is provided a high pressure gas storage facility according to claim 1, wherein the gas detector, the inner top tunnel to be connected to the cavity portion disposed above the cavity It is characterized by being provided.
[0009]
Due to such characteristics , the leaked gas rises in the drainage body due to buoyancy and reaches the gas detector via the connection pipe .
[0010]
The high-pressure gas storage facility according to claim 3 is the high-pressure gas storage facility according to claim 1, wherein the gas detector is provided above a boring hole provided from the hollow portion to the ground surface. It is characterized by that.
[0011]
This feature allows direct measurement by the gas detector even in the absence of a top tunnel. Further, the leakage gas leads to a gas detector via the rises and connection pipe drainage body by buoyancy.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the high-pressure gas storage facility according to the present invention and first and second reference examples will be described with reference to the drawings.
[0017]
< Embodiment >
Describing the embodiments of the high pressure gas storage facility according to the present invention. In the present embodiment, a high-pressure gas storage facility is constructed in the rock mass A where groundwater exists.
[0018]
As shown in FIG. 1, the cavity 1 is formed by excavating the rock mass A. The cavity 1 is connected to the ground surface via an access tunnel 2. The access tunnel 2 is configured such that an upper access tunnel 2 a connected to the upper portion of the cavity portion 1 and a lower access tunnel 2 b connected to the lower portion of the cavity portion 1 are joined on the way. Above the cavity 1, a top tunnel 3 is formed in the rock mass A, and the cavity 1 and the top tunnel 3 are connected via a shaft 4. The top tunnel 3 is connected to the access tunnel 2.
[0019]
The inner wall 1 a of the cavity 1 in the rock mass A is covered with a lining material 5. A concrete backfilling material 6 is interposed between the lining material 5 and the inner wall 1 a of the cavity 1. The space inside the lining material 5 is used as a storage tank 7 for storing high-pressure gas such as natural gas.
[0020]
A drainage body 8 is arranged between the inner wall 1 a of the cavity 1 and the backfill material 6. As shown in FIG. 3, the drainage body 8 is stretched around the entire outer peripheral surface of the backfill material 6 in a mesh shape. As shown in FIG. 2A, the drainage body 8 includes a plurality of drainage pipes 8a, a first water collection pipe 8b, a second water collection pipe 8c, and a connection socket 8d. The drainage pipe 8a is a hollow pipe having a short shape whose shape is modularized, and has a configuration in which a plurality of holes for taking in groundwater are provided on the outer peripheral surface. In the present embodiment, a net-like tube whose peripheral surface generally used in a drainage facility or the like is formed in a mesh shape is used for the drainage tube 8a. However, this is not particular, and is shown in FIG. 2 (b). A net-like tube formed into a tubular shape by adhering a net material to the inner peripheral surface of the spirally formed core material, or a plurality of rings arranged in parallel as shown in FIG. Any tubular body having a structure having a plurality of holes on its peripheral surface, such as a tubular body having a high pressure resistance, which is integrally formed into a tubular shape by weaving a linear core material, may be used. The first water collecting pipe 8b and the second water collecting pipe 8c are made of a hollow pipe such as a steel pipe or a vinyl chloride pipe that communicates with the connection pipe 11 from the drain pipe 8a. The first water collecting pipe 8b is arranged along the inner wall 1a of the cavity 1 in the vertical direction so as to connect the vicinity of the top and the bottom of the storage tank 7, and provides a constant angle when viewed from the top of the storage tank 7. Are spaced apart. The second water collecting pipe 8c is arranged along the inner wall 1a of the horizontal cavity 1 so as to be orthogonal to the first water collecting pipe 8b, and a plurality of the second water collecting pipes 8c are arranged at a predetermined interval in the vertical direction. ing. The connection socket 8d is used for the purpose of connecting a plurality of drain pipes 8a or connecting the drain pipes 8a, the first water collection pipe 8b, and the second water collection pipe 8c in communication. As shown in FIG. 3, the drainage body 8 having such a configuration is stretched in a mesh shape over the entire outer peripheral surface of the backfill material 6.
[0021]
As shown in FIG. 1, the upper part of the drainage body 8 and the gas amount measuring device 9 and the gas detection pipe 10 installed in the top tunnel 3 are branched in the horizontal direction and the vertical direction in the top tunnel 3. The pipes 11 are connected to each other. The gas amount measuring device 9 is connected to the end portion of the connection pipe 11 branched in the horizontal direction, and the gas detection tube 10 is connected in an upright state to the upper end portion of the connection pipe 11 branched in the vertical direction. The gas detection tube 10 is a cylindrical member with a scale for measuring the gas amount at the side and sealed at the upper end, and is connected to the gas detector 12 via a connection tube (not shown). Yes. The gas detector 12 is installed in the top tunnel 3 and has a function of performing gas component analysis. A pressure gauge 13 is connected to the connection pipe 11 branched in the horizontal direction.
[0022]
A gas discharge pipe 14 is connected to the gas amount measuring device 9. The gas discharge pipe 14 is piped from the top tunnel 3 to the ground surface through the access tunnel 2. A gas discharge valve 15 is interposed at the end of the gas discharge pipe 14 on the gas amount measuring device 9 side. The gas discharge valve 15 is normally closed.
[0023]
The lower part of the drainage body 8 is connected to a water collection pipe 16 piped in the lower access tunnel 2b. A drainage valve 17 is interposed in the water collection pipe 16, and the tip of the water collection pipe 16 is routed toward a water collection pit 18 installed in the lower access tunnel 2b. Further, a drain pipe 19 is provided from the water collecting pit 18 through the access tunnel 2 to the surface of the earth. A drainage pump 20 is interposed in the drainage pipe 19.
[0024]
Next, a detection method when the high-pressure gas stored in the storage tank 6 leaks in the high-pressure gas storage facility having the above-described configuration will be described.
[0025]
A high-pressure gas is stored in a storage tank 7 that is airtight by the lining material 5 and the backfill material 6. Moreover, the groundwater contained in the rock mass A enters from the drainage pipe 8a, and the inside of the drainage body 8, the connection pipe 11, and the gas detection pipe 10 is filled with water.
[0026]
When the high-pressure gas stored in the storage tank 7 leaks, the leaked high-pressure gas (hereinafter referred to as “leakage gas”) enters the drainage body 8 from the drain pipe 8a and rises due to the buoyancy of the leaked gas. The leaked gas rises from the drainage body 8 to the gas detection tube 10 via the connection pipe 11. As a result, a gas pool is generated in the gas detection tube 10 that is normally filled with water. The amount of leaked gas accumulated in the gas detector tube 10 is measured by a scale attached to the gas detector tube, and the component of the leaked gas accumulated in the gas detector tube 10 is analyzed by the gas detector 12. To do. Thereby, the presence or absence of leakage of the high-pressure gas stored in the storage tank 7 can be determined. Further, by performing a gas component analysis by the gas detector 12 at a predetermined time every day, it is possible to grasp the presence or absence of leakage on a daily basis.
[0027]
When leakage of high-pressure gas stored in the storage tank 7 further progresses and a large amount of leakage gas is generated, the gas discharge valve 15 is opened and the leakage gas is discharged from the connection pipe 11 via the gas amount measuring device 9. It reaches the inside of the pipe 14 and is discharged to the outside from the gas discharge port 14a. At this time, the flow rate of the gas released to the outside is measured by the gas amount measuring device 9. As a result, the amount of leaked leaked gas can be grasped.
[0028]
< First Reference Example >
A first reference example related to the high-pressure gas storage facility according to the present invention will be described. In this reference example , the same components as those used in the above-described embodiment are designated by the same components, and the description thereof is omitted.
[0029]
As shown in FIG. 4, the boring hole 21 is provided vertically from the upper part of the cavity 1 until reaching the ground surface. A gas detector 12 is installed above the boring hole 21. The upper part of the drainage body 8 and the gas detector 12 are connected via a connection pipe 11 a that is piped into the borehole 21. A gas discharge pipe 14 in which a gas discharge valve 15 is interposed is connected to the head of the connection pipe 11a.
[0030]
Next, a detection method when the high-pressure gas stored in the storage tank 7 leaks in the high-pressure gas storage facility having the above-described configuration will be described.
[0031]
When the high-pressure gas stored in the storage tank 7 leaks, the leaked gas enters the drainage body 8 from the drain pipe 8a and rises due to the buoyancy of the leaked gas. The leaked gas rises from the drainage body 8 to the gas detector 12 through the connection pipe 11a. The gas detector 12 analyzes the gas component of the leaked gas that has risen. Thereby, the presence or absence of leakage of the high-pressure gas stored in the storage tank 7 can be determined.
[0032]
< Second Reference Example >
A second reference example related to the high-pressure gas storage facility according to the present invention will be described. In this reference example , the same components as those used in the above-described embodiment and the first reference example are denoted by the same components, and the description thereof is omitted. In the present embodiment, a high-pressure gas storage facility is constructed in the rock B where no groundwater exists.
[0033]
As shown in FIG. 5, the upper part of the drainage body 8 and the gas discharge valve 15 provided in the upper access tunnel 2a are connected via a connection pipe 11b. Further, the first gas detector 12 (gas detectors) installed in the upper access tunnel 2a is connected via a connecting pipe to the connecting pipe 11b. A gas discharge pipe 14 is connected to the gas discharge valve 15, and a gas discharge port 14a of the gas discharge pipe 14 is in the upper access tunnel 2a. A second gas detector 12a is installed in each of the upper access tunnel 2a and the lower access tunnel 2b.
[0034]
Since there is no groundwater in the bedrock B, the drainage body 8, the connection pipe 11 b, and the water collection pipe 16 are hollow. When the high-pressure gas stored in the storage tank 7 leaks, the leaked gas enters the drainage body 8 through the drainage pipe 8a. The leaked gas that has entered the drainage body 8 flows in the drainage body 8 and reaches the gas discharge valve 15 via the connection pipe 11b. At this time, the gas discharge valve 15 is closed, and the gas component analysis of the leaked gas is performed by the first gas detector 12. Thereby, the gas concentration in the drainage body 8 can be measured. Gas component analysis is performed on a daily basis, and the presence or absence of leakage can be determined by the change in gas concentration. Further, since there is no ground water in the bedrock B, the leaked gas flows through the water collecting pipe 16 and reaches the drain valve 17. At this time, the drain valve 17 is closed.
[0035]
Further, when the high-pressure gas stored in the storage tank 7 further leaks and a large amount of leaking gas is generated, the gas discharge valve 15 and the drain valve 17 are opened, and the leaked gas is transferred into the upper access tunnel 2a and the lower access tunnel 2b. When the gas is discharged into the inside, the gas components in the upper access tunnel 2a and the lower access tunnel 2b are measured by the second gas detector 12a. Thereby, the presence or absence of leakage can be grasped.
[0036]
Although the embodiment of the present invention has been described above , the present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the scope of the present invention. For example, in the above-described embodiment, the case of the high-pressure gas storage facility constructed in the rock is described, but the present invention is also applicable to the case of the high-pressure gas storage facility constructed in the ground other than the rock . Further, in the previous first reference example , the gas amount measuring device 9 and the gas detection tube 10 are not installed. However, the present invention installs the gas detection tube 10 in the embodiment described above in the first reference example. It can also be set as the structure to do .
[0037]
【The invention's effect】
As described above, according to the high-pressure gas storage facility according to the present invention, the presence or absence of leakage of the high-pressure gas always stored in the storage tank can be determined by measuring the gas components on a daily basis with the installed gas detector. I can judge. In addition, when a leak of high-pressure gas stored in the storage tank occurs, the leaked gas enters the drainage body from the drain pipe, reaches the gas detector pipe via the connection pipe, and enters the gas detector pipe filled with water. Gas accumulation occurs in The components of the leaked gas accumulated in the gas detection tube are analyzed by a gas detector connected to the gas detection tube via a connection tube. Thus, since the gas component of the leaked gas is directly measured by the gas detector, gas detection can be performed with high accuracy, and the reliability of leaked gas detection can be improved .
[0038]
Moreover, also when constructing the high-pressure gas storage facility according to the present invention in a rock or ground where there is no groundwater, it is possible to determine whether there is a leak of the high-pressure gas stored in the storage tank. Furthermore, even if a part of gas enters the drainage body, it is possible to determine whether or not there is leakage of the high-pressure gas stored in the storage tank while maintaining accuracy.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view illustrating a high-pressure gas storage facility according to an embodiment of the present invention.
2 is a view showing a drainage body disposed in the high-pressure gas storage facility shown in FIG. 1. FIG.
3 is an elevational view of the outer peripheral surface of the high-pressure gas storage facility shown in FIG. 1. FIG.
FIG. 4 is a cross-sectional view illustrating a high-pressure gas storage facility according to a first reference example of the present invention.
FIG. 5 is a cross-sectional view illustrating a high-pressure gas storage facility according to a second reference example of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cavity part 2 Access tunnel 2a Upper access tunnel 2b Lower access tunnel 3 Top tunnel 4 Vertical shaft 5 Lining material 6 Backing material 7 Reservoir 8 Drainage body 8a Drain pipe 8b First water collection pipe 8c Second water collection pipe 8d Connection socket 9 gas amount measuring device 10 gas sensing pipe 11 connecting pipe 12 first gas detector 13 pressure gauge 14 the gas exhaust pipe 15 gas exhaust valve 16 the water collecting pipe 17 drain valve 18 water collecting pit 19 drain pipe 20 drain pump 21 boreholes A Bedrock where groundwater exists B Bedrock without groundwater

Claims (3)

The inner wall of the cavity formed in the bedrock or in the ground is covered with a lining material, and a backfill material is interposed between the inner wall and the lining material, and high pressure gas is passed through the inner space of the lining material. A high-pressure gas storage facility used as a storage tank for storage,
A drainage body formed by a drain pipe arranged between the inner wall and the backfilling material and having a plurality of holes on the outer peripheral surface, and connected to the drainage body via a connection pipe, and a gas amount on the side portion A cylindrical gas detector tube with a scale for measuring the gas and sealed at the upper end, and a component analysis of gas accumulated in the gas detector tube connected to the gas detector tube via a connecting tube A high-pressure gas storage facility comprising: a gas detector that performs the operation described above, wherein the drainage body, the connection pipe, and the gas detection pipe are filled with water. In the high-pressure gas storage facility according to claim 1,
The high-pressure gas storage facility, wherein the gas detector is provided inside a top tunnel provided above the cavity and connected to the cavity. In the high-pressure gas storage facility according to claim 1,
The high-pressure gas storage facility, wherein the gas detector is provided above a boring hole provided from the hollow portion to the ground surface.

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