JP4053650B2 - Cooling system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cooling system suitable for cooling a large and long tunnel for laying a high voltage power cable in the ground, for example, called a power cable tunnel.
[0002]
[Prior art]
For example, a high voltage cable such as a CV cable (cross-linked polyethylene cable) of 100 to 1000 kV is sometimes laid in the ground. In such a case, a tunnel called a power cable tunnel is formed in the ground. Support shelves called cable racks are installed at appropriate intervals so that the cables are supported on the cable racks. For example, a tunnel called a power cable tunnel has a diameter of 5 m and a length of 30 km.
[0003]
However, in the case of the above-described high-voltage power transmission cable, a large amount of heat is generated from the cable, so the inside of the cave is at a high temperature of, for example, 45 ° C. For this reason, it was a problem for maintenance workers. Therefore, conventionally, this type of power cable sinus is cooled by the following means.
[0004]
First, a method of taking outside air into the cave and cooling it is performed. This method is in principle the simplest method. As another method, a cooling pipe is separately provided in the cave, and cooling water or a refrigerant is passed through the cooling pipe, and the cooling pipe is brought into contact with the power cable, or the cooling pipe is connected to the cave. The power cable is also indirectly cooled by laying it upward.
[0005]
[Problems to be solved by the invention]
However, the method of taking in outside air needs to take in a very large amount of outside air, and it requires a lot of equipment, including an introduction fan for taking in and an exhaust fan for exhaust, and these need to cope with a large capacity. Because of its large size, energy consumption was high. On the other hand, indirect cooling using a cooling pipe first requires a large-capacity cooler for generating cooling water and refrigerant. In addition, management of water quality such as cooling water flowing through the cooling pipe is also required separately, which is difficult in terms of maintenance.
[0006]
The present invention has been made in view of the above points, and it is possible to easily and efficiently cool the inside of a tunnel having a heating element such as the above-described power cable tunnel and greatly increase the environment of the tunnel atmosphere. It is an object of the present invention to provide a cooling system that can be improved and to solve the above problems.
[0007]
[Means for Solving the Problems]
In order to achieve the object, according to claim 1, a system for cooling the inside of a tunnel having a heating element, provided at predetermined intervals along the longitudinal direction in the tunnel, and having a particle size of 5 to 50 μm. A spraying device for spraying water into the tunnel;
A water supply device for supplying water to the spray device;
The tunnel has a first shaft and a second shaft, and a blower that blows air through the first shaft in the tunnel along the longitudinal direction of the tunnel, or of the blower in the tunnel At least one of exhaust devices for exhausting the atmosphere in the tunnel on the downstream side through the second shaft ,
The atmosphere on the downstream side of the blower in the tunnel or the upstream side of the exhaust device is sucked from a suction port provided in the upper part of the tunnel through a first path different from the first and second shafts. A mechanism, a dehumidifying device that brings the sucked air and a moisture absorbent into contact with each other, and dehumidifies the sucked air; and air that has been dehumidified by the dehumidifying device A dehumidification tower having a mechanism for returning the air again from the air supply port provided in the upper part of the tunnel through the second path located on the downstream side,
The cooling system according to claim 1, wherein a plurality of the dehumidifying towers are provided on the ground at predetermined intervals along the longitudinal direction of the tunnel .
[0008]
According to such a cooling system, the mist of sprayed water is vaporized by the heat of the heating element in the tunnel, and the inside of the tunnel can be cooled by the heat taken away at that time. Moreover, since the particle diameter of the sprayed water is set to 5 to 50 μm, it can be vaporized efficiently and immediately. Furthermore, since an airflow in a certain direction along the longitudinal direction is formed in the tunnel by the blower and the exhaust device, the lost heat can be efficiently discharged to the outside by this airflow. Here, the installation interval of the spray device may be appropriately set according to the size and length of the tunnel, the amount of heat from the heating element, and the like. For example, when cooling the cable tunnel of the high voltage power cable, it is 0. It can be proposed to install at intervals of 5m to 10m.
[0010]
In the present invention, the dehumidifying device uses a type that dehumidifies by bringing the moisture absorbent into contact with the processing air, and further, for example, the atmosphere in the tunnel is once sucked out of the tunnel and dehumidified there. I try to return it to the tunnel again. Therefore, the degree of freedom of the configuration and layout of the dehumidifying device is great. Moreover, if such a system is adopted, the upstream moisture (humidity) is absorbed by the hygroscopic agent, so that latent heat (condensation heat) moves to the air, and the air once becomes high temperature and low humidity. After that, when it is cooled with ambient air, it becomes medium temperature and low humidity. In this state, when water is returned to the tunnel and sprayed with water again with a fine particle size, the water immediately vaporizes and takes away latent heat (heat of vaporization) from the air in the tunnel, and the air becomes low temperature. Therefore, it is possible to cool the inside of the tunnel more suitably.
[0011]
Such dehumidifying apparatus as claimed in claim 2, the absorbent can wet down dehumidifier proposed using as a moisture absorbent, yet in dehumidifying device according to claim 2, after the dehumidification process The dehumidifying tower is equipped with a regenerator that recovers the absorbent and regenerates the absorbent. The regenerator is a system that heats and regenerates the absorbent itself and the container that stores the absorbent. Moreover, since the container can be regenerated by heating, for example, the running cost can be significantly reduced by heating with, for example, warm water or heater using nighttime power. Examples of the absorbent include lithium chloride and lithium bromide solutions.
[0013]
As the dehumidifying device, an adsorption type dehumidifying device using, for example, silica gel or zeolite as described in claim 3 , and heated regenerated air for regenerating the adsorbent after further dehumidifying treatment May be provided separately.
[0014]
If a heat source used for regeneration in the cooling system is obtained from the heat pump as in claim 4 , the cold heat from the heat pump is used for cooling the air after being dehumidified by the dehumidifier. be able to. Therefore, effective use of energy is achieved and it contributes to cooling in the tunnel.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a cooling system according to a preferred embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows an outline of the configuration of a cooling system according to the present embodiment. Reference numeral 1 denotes a cable tunnel for laying a high-voltage cable 2, which is, for example, from a power plant to a substation. And for laying the high voltage cable 2 to the rising portion of the overhead wire laying location.
[0017]
The cable shaft 3 that forms the entrance to the high voltage cable 2 in the cable tunnel 1 and the cable shaft 4 that forms the exit, that is, the outer sides of both ends of the cable tunnel 1 further outward. The shafts 11 and 12 are separately constructed at the point. The shaft 11 is for blowing air from the fan coil unit 14 having an air supply fan 13 as a blower into the cable tunnel 1. The shaft 12 is for exhausting the atmosphere in the cable sinus 1 to the ground by an exhaust fan 15 as an exhaust device. In this case, of course, a duct may be appropriately constructed in the shafts 11 and 12, and air may be blown and exhausted through the duct. Further, a blower fan may be installed at the entrance of the cable passage 1 in the underground portion, and an exhaust fan may be installed at the exit of the underground portion of the cable passage 1. Further, the fan arrangement of these underground portions may be used in combination with this embodiment. Good.
[0018]
As shown in FIG. 2, a water supply pipe 21 is provided near the ceiling in the cable tunnel 1, and a nozzle 22 as a spraying device is provided at an appropriate interval in the water supply pipe 21. It is attached. The nozzle 22 sprays the water flowing in the water supply pipe 21 toward the lower high voltage cable 2 in the form of a mist having a particle diameter of about 5 to 50 μm. The water in the water supply pipe 21 is supplied by a pump 24 from a tank 23 installed near the ground outlet of the shaft 11. Reference numeral 23a denotes a pump for pumping water into the tank.
[0019]
The above-described fan coil unit 14 includes a cooling coil 16, a heating coil 17, and a filter 18. After the outside air taken in passes through the filter 18 and is purified, the temperature is adjusted by the cooling coil 16 and the heating coil 17. It is used as an air conditioner.
[0020]
An area where the nozzle 22 is not attached is set in the water supply pipe 21 in the middle portion of the cable sinus 1, and a suction port 41 for sucking the atmosphere in the cable sinus 1 is provided in the area E. . The air sucked from the suction port 41 is dehumidified by the dehumidifying device in the dehumidifying tower 42 installed on the ground, and then returned to the cable path 1 again through the air supply port 43. It has become.
[0021]
The dehumidifying tower 42 has the configuration shown in FIG. First, the air in the cable sinus 1 sucked from the suction port 41 by the suction fan 44 is introduced into the dehumidifying device 45. The dehumidifying device 45 is a wet dehumidifying device using a liquid absorbent such as a lithium chloride solution as a hygroscopic agent, and the liquid absorbent stored in the tank 46 is transferred to the shower in the dehumidifying apparatus 45 by the pump 47. When sprayed from the nozzle 48, the air in the cable sinus 1 sucked from the suction port 41 by the suction fan 44 is brought into contact with the liquid absorbent and dehumidified. The suction amount is set to be, for example, about 1/3 to 1/2 of the total airflow flowing in the cable tunnel 1.
[0022]
The sprayed liquid absorbent is received by the pan 49 and returned to the tank 46 by the pump 50. The tank 46 is configured to function as a regenerating device, and the liquid absorbent in the tank 46 is heated by the heat supplied by the heat pump device 51 and is regenerated by this heating. At this time, the cooling heat generated in the heat pump device 51 is configured to be a cooling heat source of the cooler 52. Therefore, the heat pump device 51 can be used effectively. The cooler 52 cools the air dehumidified by the dehumidifying device 45. Therefore, the air dehumidified by the dehumidifying device 45 is dehumidified, cooled, and returned from the air supply port 43 into the cable path 1 again.
[0023]
The main part of the cooling system according to the present embodiment has the above-described configuration. When water mist having a minute particle diameter of 5 to 50 μm is sprayed from the nozzle 22, The mist immediately vaporizes due to heat, at which time it takes heat away from the surrounding atmosphere. In addition, air is supplied from the air supply fan 13 of the fan coil unit 14 into the cable sinus 1 and the atmosphere in the cable sinus 1 is exhausted to the ground by the exhaust fan 15. In the road 1, an air flow in a certain direction is formed from the vertical shaft 11 to the vertical shaft 12 as indicated by a thick arrow in FIG. 1. Therefore, the thermal atmosphere when the mist is vaporized is exhausted to the ground by this air flow without stagnation.
[0024]
In addition, since the atmosphere in the middle portion of the cable sinus 1 is sucked from the suction port 41 and dehumidified by the dehumidifying device 45, it is returned to the cable sinus 1 again. It is prevented that the atmosphere in 1 becomes an excessively humid atmosphere. In addition, when the air is returned to the cable passage 1, the dehumidified air can be cooled there by the cooler 52, so that the inside of the cable passage 1 can also be cooled thereby. ing. Therefore, the environment in the cable sinus 1 can be further improved.
[0025]
Furthermore, in the above embodiment, since the air blown by the air supply fan 13 can be further cooled by the fan coil unit 14, even if the temperature and humidity of the outside air are high, this can be performed at an appropriate temperature and humidity. Can be lowered to
[0026]
In addition, when the cable cave 1 is long and, as a result, it is not possible to reduce the moisture level to a predetermined level or less with only one dehumidifying tower 42, as shown in FIG. The towers 42 'may be installed at appropriate intervals. Then, as shown in the lower graph of FIG. 4, the moisture content can be reduced in the area of the other dehumidifying tower 42 ′ without exceeding the moisture content target value (MAX). Therefore, an excessively moist atmosphere can be prevented over the entire cable path 1.
[0027]
In the above embodiment, when the atmosphere in the cable passage 1 is dehumidified, the atmosphere in the cable passage 1 is once removed from the suction port 41 by the suction fan 44 in the dehumidifying tower 42 on the ground. However, instead of this, as shown in FIG. 5, a wet dehumidifying device 61 may be directly installed in the cable sinus 1. In this case, as described above, it is not necessary to dehumidify the total air volume flowing in the cable tunnel 1, so that, for example, about 1/3 to 1/2 of the cross-sectional area in the cable tunnel 1 is viewed from the axial direction. What is necessary is just to comprise so that the airflow which flows the inside of the cable sinus 1 by the width can be taken in in an apparatus. Therefore, the high voltage cable 2 laid in the cable tunnel 1 is not disturbed.
[0028]
The dehumidifying device 61 performs the dehumidifying process by allowing the air flow formed in the cable tunnel 1 to pass through the device as it is and bringing it into gas-liquid contact with the liquid absorbent sprayed from the shower nozzle 62. It has become. According to such a configuration, installation of a suction fan or the like is not necessary.
[0029]
The sprayed liquid absorbent is collected by a pan 63 and pumped up to a tank 65 installed on the ground by a pump 64. The liquid absorbent in the tank 65 is heated and regenerated by the hot water supplied from the water heater 67 by the pump 66. In addition, if this water heater 67 uses the electric water heater of the type which uses night electric power, for example, since warm water can be produced | generated at night, the running cost can be reduced.
[0030]
The dehumidifiers 45 and 61 used in the cooling system described above were so-called wet dehumidifiers using a liquid absorbent as a hygroscopic agent, but the present invention uses an adsorbent such as silica gel or zeolite as a hygroscopic agent. It is also possible to use a so-called dry-type dehumidifier used.
[0031]
FIG. 6 shows such an example, and the air in the cable sinus 1 sucked by the suction fan 71 from the suction port 41 is sent to the dry dehumidifiers 72 and 73. In this example, two dry dehumidifying devices 72 and 73 are used, and either of the dry dehumidifying devices 72 and 73 can be switched to a dehumidifying operation or arbitrarily switched by dampers D1 and D2. For example, when the damper D1 is opened and the damper D2 is closed and the dry dehumidifier 72 is used, the regenerated air heated by the heating coil 74 is supplied to the regenerative fan 75 in the other dry dehumidifier 73. To be sent by. Such switching of the regeneration air supply path is performed by dampers D3 and D4.
[0032]
Hot water generated by the water heater 76 is sent to the heating coil 74 by a pump 77. Also for the water heater 76, if an electric water heater of a type that uses nighttime electric power is used, hot water can be generated at night, so that the running cost can be reduced.
[0033]
The air that has been dehumidified by the dry dehumidifier 72 is returned to the cable path 1 through the air supply port 43. On the other hand, the regenerated air regenerated from the dry dehumidifier 73 is discharged to the outside through the exhaust port 78. Therefore, in this case, the damper D5 on the outlet side is opened and the damper D6 is closed. The damper D7 is in a closed state, and the damper D8 is open. When the dehumidifying performance of the dry dehumidifying device 72 is reduced by performing the dehumidifying process, the dampers D1 to D8 are switched as appropriate, the dry dehumidifying device 72 is regenerated, and the dry dehumidifying device 73 is dehumidified. By doing so, the dehumidification treatment can be carried out continuously. In any case, in the present invention, even if a dry dehumidifier is used, the atmosphere in the cable sinus 1 can be prevented from becoming excessively wet. Of course, in this case, it is easy to add a reproduction function.
[0034]
The above embodiment is an example in which the cable tunnel 1 for laying the high voltage cable 2 is selected as an object to be cooled. However, the present invention is not limited to this, and other large scales in which a heating element is present. It can be applied to a space or a long space. For example, the present invention can be applied to an indoor stadium such as a dome stadium, a subway yard, a subway tunnel, an underground mall, and other deep underground structures. Therefore, the tunnel referred to in the specification of the present application includes these large-scale spaces and long spaces.
[0035]
【The invention's effect】
According to the first to fourth aspects of the present invention, the inside of the tunnel having the heating element can be efficiently cooled, and the atmosphere in the tunnel can be prevented from becoming excessively wet. Moreover, it is effective when cooling a long distance tunnel. In addition, the degree of freedom of the configuration and layout of the dehumidifier is great. In the cooling system according to the second aspect , the regeneration of the absorbent can be easily performed. Further, in the case of claim 3 , since a large dehumidifying ability is obtained, the effect of improving the environment in the tunnel is great. According to the cooling system of claim 4 , energy is effectively used, and the cooling effect in the tunnel is great.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing an outline of a configuration of a cooling system according to an embodiment of the present invention.
2 is a longitudinal sectional view in the axial direction of a cable sinus in the cooling system of FIG. 1;
FIG. 3 is an explanatory diagram showing an outline of the configuration of a dehumidifying tower used in the cooling system of FIG. 1;
FIG. 4 is an explanatory diagram showing an outline when a plurality of dehumidifying towers are installed and a change in the amount of moisture in the cable tunnel corresponding to the installed tower.
FIG. 5 is an explanatory view showing an example in which a dehumidifying device is installed in a cable tunnel.
FIG. 6 is an explanatory diagram showing an example in which a dry-type dehumidifier is used as a dehumidifier.
[Explanation of symbols]
1 Cable tunnel 2 High voltage cable 11 Vertical shaft (for ventilation)
12 Vertical shaft (for exhaust)
13 Air supply fan 14 Fan coil unit 15 Exhaust fan 21 Water supply pipe 22 Nozzle 24 Pump 41 Suction port 42 Dehumidifying tower 43 Air supply port 44 Suction fan 45 Dehumidifying device 46 Tank 51 Heat pump device 52 Cooler

Claims (4)

A system for cooling the inside of a tunnel having a heating element, the spraying device being provided at predetermined intervals along the longitudinal direction in the tunnel, and spraying water into the tunnel with a particle size of 5 to 50 μm,
A water supply device for supplying water to the spray device;
The tunnel has a first shaft and a second shaft, and a blower that blows air through the first shaft in the tunnel along the longitudinal direction of the tunnel, or of the blower in the tunnel At least one of exhaust devices for exhausting the atmosphere in the tunnel on the downstream side through the second shaft ,
The atmosphere on the downstream side of the blower in the tunnel or the upstream side of the exhaust device is sucked from a suction port provided in the upper part of the tunnel through a first path different from the first and second shafts. A mechanism, a dehumidifying device that brings the sucked air and a moisture absorbent into contact with each other, and dehumidifies the sucked air; and air that has been dehumidified by the dehumidifying device A dehumidification tower having a mechanism for returning the air again from the air supply port provided in the upper part of the tunnel through the second path located on the downstream side,
The cooling system according to claim 1, wherein a plurality of the dehumidifying towers are provided on the ground at predetermined intervals along the longitudinal direction of the tunnel . The dehumidifying device is a wet dehumidifying device using an absorbent as a hygroscopic agent, and further includes a regeneration device for recovering the absorbent after performing the dehumidifying treatment and regenerating the absorbent in the dehumidifying tower. 2. The cooling system according to claim 1, wherein the regenerator is a system for regenerating by heating an absorbent or a container storing the absorbent . The reduced humidity device is a suction type, down-humidity device using an adsorbent as hygroscopic agents, wet the reduced reproduction apparatus for generating a heated regeneration air to regenerate the adsorbent after the further dehumidified process The cooling system according to claim 1, wherein the cooling system is provided in a tower . The heat used for regeneration in the regenerator is supplied from a heat pump, and the cool heat from the heat pump is configured to be used for cooling the air after being dehumidified by the dehumidifier. The cooling system according to claim 2 or 3 .

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