JP2017038789A - Disaster prevention equipment for hydrogen station - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide disaster prevention equipment for a hydrogen station capable of carrying out a small amount of water spray for a hydrogen storage tank using equipment for extinguishing a fire.SOLUTION: Disaster prevention equipment for a hydrogen station having a storage tank 13 for storing hydrogen, includes: a sprinkling unit 24 for sprinkling water on the storage tank 13; a water supply line for supplying water to the sprinkling unit 24; a fire detection unit 30 for detecting an occurrence of a fire in a room where the storage tank 13 is installed; and a temperature detection unit 32 for detecting the temperature of the storage tank 13. The water supply line includes a first supply line 25 for supplying water for extinguishing a fire, and a second supply line 26 for supplying water in a smaller amount than that by the first supply line 25. When it is detected in the temperature detection unit 32 that the temperature in the storage tank 13 is higher than or equal to a predetermined value, water is supplied from the second supply line 26 to the sprinkling unit 24.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a disaster prevention facility for a hydrogen station that stores liquid hydrogen or compressed hydrogen and supplies hydrogen to a fuel cell vehicle or the like.

  A fuel cell vehicle using hydrogen as a fuel does not emit carbon dioxide when running, nor does it emit NOx or other substances that cause air pollution. Further, since it can travel several hundred km with a fuel supply of about several minutes, it is more convenient than an electric vehicle that requires time for charging. For this reason, technological development for fuel cell vehicles that are expected to become popular in the future is underway.

  The fuel supply to the fuel cell vehicle is performed at the hydrogen station. There are two types of hydrogen stations: an off-site type that stores and supplies hydrogen that is manufactured and transported in a factory or the like, and an on-site type that reforms raw materials such as LPG in the station to produce and supply hydrogen.

  If hydrogen leaks or ignites, it may cause a large-scale explosion. Regardless of the type, the compartment where the hydrogen storage tank is placed must be surrounded by a barrier with a predetermined strength and height. It has been demanded. Also, in the unlikely event that a fire occurs in a hydrogen station, there is a possibility of a major disaster, so it is necessary to provide a more stringent fire prevention facility than ordinary facilities. As a hydrogen station provided with such fire prevention equipment, there is one as listed in Patent Document 1, for example.

JP 2012-66086 A

  Equipment with high-pressure hydrogen, such as hydrogen storage tanks, may be destroyed due to an increase in internal pressure when the temperature rises. Therefore, always monitor the surface temperature so that it does not exceed the specified temperature. In such a case, it is necessary to lower the temperature of the storage tank by spraying water.

  A conventional hydrogen station is provided with a fire extinguishing facility including a water spray head and a water supply line for extinguishing fires in the event of a fire at the storage tank location. Even when the surface temperature of the storage tank rose, this fire extinguishing equipment was used to spray water from the water spray head to lower the temperature of the storage tank.

  Such fire extinguishing equipment is designed to spray a large amount of water to extinguish a fire, but not so much water is required if the purpose is to lower the temperature of the storage tank. Nevertheless, when using a fire extinguishing facility to lower the temperature of the storage tank, a large amount of water is wasted. Moreover, since water spraying similar to that at the time of a fire occurs, there is a possibility that tension is applied to the hydrogen station and the people around it.

  This invention is made in view of the said subject, and it aims at providing the disaster prevention equipment of the hydrogen station which can also perform a small amount of water spray with respect to the hydrogen storage tank using the equipment which extinguishes a fire. To do.

In order to solve the above-mentioned problem, the hydrogen station disaster prevention equipment according to claim 1 is a hydrogen station disaster prevention equipment having a storage tank for storing hydrogen.
A watering part for sprinkling water to the storage tank, a water supply line for supplying water to the watering part, a fire detection part for detecting the occurrence of a fire in a room provided with the storage tank, and the storage tank A temperature detection unit for detecting the temperature of
The water supply line has a first supply line that supplies water for extinguishing a fire, and a second supply line that supplies a smaller amount of water than the first supply line,
When the temperature detecting unit detects that the temperature of the storage tank is equal to or higher than a predetermined level, water is supplied from the second supply line to the watering unit. .

  According to the first aspect of the present invention, when the temperature of the storage tank is equal to or higher than a predetermined value, the second supply line that supplies a smaller amount of water is used instead of the first supply line used for fire extinguishing. .

  Further, in the disaster prevention equipment for a hydrogen station according to the invention of claim 2, the water supply line has a switching unit that switches between the first supply line and the second supply line, and the switching unit includes the temperature When the detection unit detects that the temperature of the storage tank is equal to or higher than a predetermined level, the line for supplying water to the watering unit is switched to the second supply line.

  According to the invention which concerns on Claim 2, the watering at the time of fire occurrence and the watering at the time of a temperature rise can be easily switched by control of a switching part.

  Furthermore, in the disaster prevention equipment for a hydrogen station according to the invention of claim 3, the second supply line branches from the first supply line, and merges with the first supply line via a water pressure reducing unit. It is configured as a feature.

  According to the invention which concerns on Claim 3, a pump should just be provided only in the 1st supply line, and the structure of a hydrogen station can be simplified.

  Furthermore, in the disaster prevention equipment for a hydrogen station according to the invention of claim 4, the first supply line and the second supply line are merged at a merge portion, and upstream of the merge portion of the first supply line. And a check valve is provided on the upstream side of the merging portion of the second supply line.

  According to the fourth aspect of the present invention, water spraying with different amounts of water can be performed when a fire occurs and when a temperature rises without performing switching control. That is, switching control is not necessary and the operation flow can be further simplified.

  According to the disaster prevention equipment for the hydrogen station according to the present invention, when the surface temperature of the storage tank exceeds a predetermined level, water is sprayed through the second supply line in a smaller amount than at the time of the fire. In addition, it is possible to prevent tension from being applied to the hydrogen station and the people around it during cooling.

It is a block diagram of the hydrogen station provided with the disaster prevention equipment in this embodiment. It is a supply flow figure of water to a water spray head. It is a block diagram of the hydrogen station which has the disaster prevention equipment of a 1st modification. It is a block diagram of the hydrogen station which has the disaster prevention equipment of a 2nd modification. It is a block diagram of the hydrogen station which has the disaster prevention equipment of a 3rd modification.

  Embodiments of the present invention will be described in detail with reference to the drawings. In FIG. 1, the block diagram of the hydrogen station provided with the disaster prevention equipment in this embodiment is shown. The hydrogen station shown in this figure is provided with a gasoline station, and is configured as an on-site type capable of reforming fuel and producing hydrogen in the station.

  As shown in FIG. 1, the hydrogen station of the present embodiment is installed facing the road 1 and is provided in a region surrounded by predetermined partition walls 2 defined by laws and regulations. In a region surrounded by the partition walls 2, a place where hydrogen is produced (reformed) and stored is surrounded by a barrier 3 having a height of 2 m or more.

  In the hydrogen station, a hydrogen dispenser 5 for supplying hydrogen to the automobile and an oil supply facility 6 for supplying gasoline to the automobile are arranged. Furthermore, an office building 4 is also arranged in the hydrogen station. In the office building 4, there is installed a monitoring panel 33 capable of centrally monitoring when an abnormality such as a fire is detected by a fire detector or the like installed in the hydrogen station.

  The fuel used as a raw material for hydrogen is stored in a fuel tank 10 provided in the basement of the hydrogen station. The fuel from the fuel tank 10 is sent to the hydrogen production device 11, where the fuel is reformed to produce hydrogen. The produced hydrogen is in a gaseous state, which is sent to the compressor 12 to be compressed and stored in the storage tank 13 in a compressed hydrogen state.

  If a fire or the like occurs in an area surrounded by the barrier 3, there is a risk of igniting hydrogen, so a plurality of devices for detecting an abnormality such as a fire are installed in this area. In the present embodiment, a fire detector 30 that detects the occurrence of a fire in the area within the barrier 3 and a fire when an abnormality such as the occurrence of a fire is manually notified or a fire occurrence is detected by the fire detector 30 are detected. An activation device 31 for transmitting a confirmation signal and a temperature detection unit 32 for monitoring the surface temperature of the storage tank 13 and the temperature at a place where hydrogen is produced (reformed) and stored are provided. A fire sensor 30 and an activation device 31 are also provided near the hydrogen dispenser 5. The fire detector 30, the activation device 31, and the temperature detection unit 32 are all connected to the monitoring panel 33.

  In a region surrounded by the barrier 3, a water spray head 24, which is a water sprinkling part capable of watering the storage tank 13, is provided. A plurality of water spray heads 24 are installed at positions where water can be sprayed with respect to the storage tank 13 upon receiving water from the water supply line. The water spray head 24 can sprinkle water to extinguish the fire when a fire occurs, and can spray water to cool the storage tank 13 when the surface temperature of the storage tank 13 rises.

  The water supply line for the water spray head 24 will be further described. A water storage tank 20 for storing water for fire extinguishing is provided in the basement of the hydrogen station. From the water storage tank 20, water can be pumped using the high-pressure pump 21. The water pumped up from the water storage tank 20 is sent to the first supply line 25 through the high-pressure pump 21.

  In addition to the first supply line 25 for sending water from the water storage tank 20, the water supply line is also provided with a second supply line 26. The second supply line 26 uses water from the outside as a water source, and supplies water to the water spray head 24 side via the low-pressure pump 22. The low pressure pump 22 supplies water at a lower pressure than the high pressure pump 21 in the first supply line 25. For this reason, the flow rate of water supplied from the second supply line 26 is smaller than the flow rate of water supplied from the first supply line 25.

  The first supply line 25 and the second supply line 26 are joined by a switching valve 23 serving as a switching unit, and a common line 27 is formed between the switching valve 23 and the water spray head 24. The switching valve 23 is a valve capable of switching between a state in which water is passed from the first supply line 25 to the common line 27 and a state in which water is passed from the second supply line 26 to the common line 27.

  FIG. 2 shows a flow chart of water supply to the water spray head 24. First, the presence / absence of abnormality detection is determined (S1).

  If no abnormality is detected in S1, the presence or absence of a rise in the surface temperature of the storage tank 13 is detected (S2). If the surface temperature of the storage tank 13 has risen above a predetermined level, the line of water supplied to the water spray head 24 side at the switching valve 23 is switched to the second supply line 26 (S3). At this time, if the second supply line 26 and the water spray head 24 are already in communication, the state is maintained as it is.

  Thereafter, water is supplied to the water spray head 24 via the low-pressure pump 22 (S4). Water from the second supply line 26 is guided from the switching valve 23 to the common line 27 and sprinkled from the water spray head 24 toward the storage tank 13. Since the water from the second supply line 26 is low-pressure water, the amount of water sprayed from the water spray head 24 is the amount of water required to cool the storage tank 13 and is relatively small.

  If an abnormality is detected in S1, the line of water supplied to the water spray head 24 side in the switching valve 23 is switched to the first supply line 25 (S5). At this time, if the first supply line 25 and the water spray head 24 are already in communication, the state is maintained as it is.

  Thereafter, water is supplied to the water spray head 24 via the high-pressure pump 21 (S6). Water from the first supply line 25 is guided from the switching valve 23 to the common line 27 and sprinkled from the water spray head 24 toward the storage tank 13. Since the water from the first supply line 25 is high-pressure water, the amount of water sprayed from the water spray head 24 is the amount of water necessary to extinguish a fire generated around the storage tank 13, A large amount.

  As described above, when the surface temperature of the storage tank 13 becomes equal to or higher than a predetermined value, water can be saved by performing a small amount of watering from the time of the fire through the second supply line 26 and at the time of cooling. It is possible to avoid putting tension on the hydrogen station and the people around it. On the other hand, in the event of a fire, a large amount of water can be sprinkled through the first supply line 25 to ensure fire extinguishing.

  Next, a first modification of the present invention will be described. In FIG. 3, the block diagram of the hydrogen station which has the disaster prevention equipment of a 1st modification is shown. Since the configuration of this modification is almost the same as that of FIG. 1, the description of the common parts is omitted.

  As shown in FIG. 3, in this modification, the water supplied to the water supply line is only from the water storage tank 20, and only the high-pressure pump 21 is provided as the pump. The second supply line 41 branches from the first supply line 40 at the switching valve 43 and merges with the first supply line 40 at the switching valve 44 downstream of the second supply line 41. A common line 27 is downstream of the switching valve 44. The second supply line 41 is provided with a water decompression unit 42. The decompression unit 42 is configured by a decompression valve, a constant flow valve, an orifice hole, or the like, and can reduce the pressure of high-pressure water.

  The upstream switching valve 43 can switch between a state in which the water from the high-pressure pump 21 passes through the first supply line 40 and a state in which the water from the high-pressure pump 21 passes through the second supply line 41. . Further, the downstream switching valve 44 can switch between a state in which the water from the first supply line 40 is passed through the common line 27 and a state in which the water from the second supply line 41 is passed through the common line 27. . The two switching valves 43 and 44 operate in conjunction with each other, and when the upstream switching valve 43 is in a state of passing water to the first supply line 40 side, the downstream switching valve 44 is connected to the first supply line. When the upstream switching valve 43 is in a state of passing water to the second supply line 41 side, the downstream switching valve 44 is connected to the second supply line 41 from the second supply line 41. Water is passed through the common line 27.

  When the occurrence of a fire is detected at the hydrogen station, the switching valves 43 and 44 are in a state where the water from the high-pressure pump 21 flows from the first supply line 40 to the common line 27 as it is. On the other hand, when the surface temperature of the storage tank 13 exceeds a predetermined value, the switching valves 43 and 44 guide the water from the high-pressure pump 21 to the second supply line 41 and share the water whose pressure has been reduced by the decompression unit 42. It will be in the state which flows into line 27.

  In this way, the water supply portion is shared by the first supply line 41 and the second supply line 41 so that the first supply line 40 and the second supply line 41 can be switched, and the second supply line 41 can be switched. By providing the decompression unit 42 in the supply line 41, water can be sprayed with different amounts of water when the fire occurs and when the temperature rises. In this case, since only the high-pressure pump 21 is required, the configuration of the hydrogen station can be simplified.

  In this modification, the switching valve 44 is provided at a portion where the downstream portion of the second supply line 41 joins the first supply line 40, but instead, the pressure reducing portion 42 of the second supply line 41 is provided. A check valve may be provided further downstream.

  Next, a second modification of the present invention will be described. In FIG. 4, the block diagram of the hydrogen station which has the disaster prevention equipment of a 2nd modification is shown. Since the configuration of this modification is almost the same as that of FIG. 1, the description of the common parts is omitted.

  As shown in FIG. 4, in the present modification, as in the case of FIG. 1, the first supply line 25 to which water is supplied from the water storage tank 20 includes a high-pressure pump 21, and an external water source such as water supply. The second supply line 26 to which water is supplied from has a low-pressure pump 22, but does not have a switching valve 23, and the first supply line 25 and the second supply line 26 are simply joined together. The downstream side is a common line 27.

  The first supply line 25 has a check valve 45 on the upstream side of the junction with the second supply line 26, and the second supply line 26 is upstream of the junction with the first supply line 25. A check valve 46 is provided on the side. As a result, when high-pressure water is supplied from the first supply line 25, water does not flow backward to the second supply line 26, and low-pressure water is supplied from the second supply line 26. In such a case, water does not flow backward to the first supply line 25 side. That is, even if the switching valve 23 is not provided as shown in FIG. 1, it is possible to spray water with different amounts of water when the fire occurs and when the temperature rises. Thereby, the switching control in the switching valve 23 can be made unnecessary, and the operation flow can be further simplified.

  Next, a third modification of the present invention will be described. In FIG. 5, the block diagram of the hydrogen station which has the disaster prevention equipment of a 3rd modification is shown. Since the configuration of this modification is almost the same as that of FIG. 1, the description of the common parts is omitted.

  As shown in FIG. 5, in this modification, the 1st supply line 50 is extended from the water storage tank 20, the 2nd supply line 51 is drawn in from the outside, and the switching valve 53 is arrange | positioned in both merging positions. ing. A downstream side of the switching valve 53 is a common line 27, and a discharge variable pump 52 that can change the discharge pressure by controlling the number of revolutions of the pump is disposed in the common line 27. The switching valve 53 can switch between a state in which water flows from the first supply line 50 to the common line 27 and a state in which water flows from the second supply line 51 to the common line 27. The discharge variable pump 52 supplies water to the water spray head 24 at a high pressure in a state where the switching valve 53 communicates with the first supply line 50, and the switching valve 53 is connected to the second supply line 51. In a state of communicating with the side, water is supplied to the water spray head 24 at a low pressure.

  As another modification, only the first supply line 25 is provided as a water supply line, and a discharge variable pump capable of selectively supplying either high-pressure water or low-pressure water is provided, so that in the event of a fire, High pressure water is supplied from the pump to the water spray head 24, and when the temperature of the storage tank 13 rises, low pressure water is supplied to the water spray head 24, and the amount of water supplied is adjusted according to the situation. Also good.

  Although the embodiment of the present invention has been described above, the application of the present invention is not limited to the above-described embodiment, and can be variously applied within the scope of the technical idea. For example, in the above-described embodiment, the water spray head 24 is used as a sprinkling unit for the storage tank 13, but other watering means such as a water spray gun may be used.

  In the above-described embodiment, the water supplied to the first supply line 25 is from the water storage tank 20 and the water supplied to the second supply line 26 is from an external water source such as a water supply. They may be common or they may be interchanged.

  In the above-described embodiment, the on-site type hydrogen station has been described. However, the present invention can be similarly applied to an off-site type hydrogen station that transports and stores hydrogen from the outside.

DESCRIPTION OF SYMBOLS 1 Road 2 Bulkhead 3 Barrier 4 Office building 5 Hydrogen dispenser 6 Refueling equipment 10 Fuel tank 11 Hydrogen production device 12 Compressor 13 Storage tank 20 Water storage tank 21 High pressure pump 22 Low pressure pump 23 Switching valve 24 Water spray head 25 First Supply line 26 Second supply line 27 Common line 30 Fire detector 31 Start-up device 32 Temperature detector 33 Monitor panel

Claims (4)

In the hydrogen station disaster prevention equipment with a storage tank for storing hydrogen,
A watering part for sprinkling water to the storage tank, a water supply line for supplying water to the watering part, a fire detection part for detecting the occurrence of a fire in a room provided with the storage tank, and the storage tank A temperature detection unit for detecting the temperature of
The water supply line has a first supply line that supplies water for extinguishing a fire, and a second supply line that supplies a smaller amount of water than the first supply line,
When the temperature detection unit detects that the temperature of the storage tank is equal to or higher than a predetermined value, water is supplied from the second supply line to the watering unit. Disaster prevention equipment.   The water supply line includes a switching unit that switches between the first supply line and the second supply line, and the switching unit detects that the temperature of the storage tank is equal to or higher than a predetermined value at the temperature detection unit. The hydrogen station disaster prevention equipment according to claim 1, wherein, when it is done, a line for supplying water to the sprinkler is switched to the second supply line.   2. The disaster prevention equipment for a hydrogen station according to claim 1, wherein the second supply line branches from the first supply line and joins the first supply line through a water decompression unit.   The first supply line and the second supply line are merged at a merge portion, and upstream of the merge portion of the first supply line and upstream of the merge portion of the second supply line. The hydrogen station disaster prevention equipment according to claim 1, further comprising a check valve.

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