JP3640992B2 - Nuclear power plant ventilation equipment - Google Patents

Description

[0001]
[Industrial application fields]
  The present invention relates to a ventilation facility for a nuclear power plant that ventilates a building interior of the nuclear power plant.
[0002]
[Prior art]
  In general, a building in a nuclear power plant has ventilation equipment for cooling equipment and maintaining the environment of operators.
[0003]
  Hereinafter, a conventional example of a ventilation facility for a nuclear power plant will be described with reference to FIGS. 11 and 12. In FIG. 11, a plurality of blowers 7a, 7b, 7c in which outside air is taken in from the outside air intake port 1 and the air volume adjusting devices 6a, 6b, 6c, 6d are connected to the air supply processing device 5 incorporating the air supply filter 4, respectively. 7d are installed in parallel. A coil casing 9 containing a cooling heating coil 8 that cools or heats the outside air is connected to the outlets of the plurality of blowers 7a, 7b, 7c, and 7d. The air is blown into the building 11.
[0004]
  The air inside the building 11 is passed through the exhaust duct 12 to a plurality of exhaust treatment devices 14a, 14b, 14c, 14d including exhaust filters 13a, 13b, 13c, 13d installed to purify the exhaust air. Connected. On the outlet side of these exhaust treatment devices 14a, 14b, 14c, 14d, exhaust fans 16a, 16b, 16c, 16d are installed via air volume control devices 15a, 15b, 15c, 15d. Exhaust air sent from the exhaust fans 16a, 16b, 16c, and 16d is exhausted from the exhaust tower 17.
[0005]
  FIG. 12 is a system configuration diagram of emergency ventilation equipment that cools by taking in outside air but does not have an air heating device. A plurality of blowers 7a, 7b, 7c, 7d, each of which is connected to an air supply processing device 5 that takes in outside air from the outside air intake 1 and incorporates an air supply filter 4 and is connected with air volume control devices 6a, 6b, 6c, 6d, are arranged in parallel. Is installed. Clean air is blown into the building 11 from the plurality of blowers 7 a, 7 b, 7 c, 7 d through the air supply duct 10. The air inside the building 11 is exhausted from the exhaust port 25 through the exhaust duct 12 after removing heat from the electrical component 23 and the like.
[0006]
[Problems to be solved by the invention]
  In the above-mentioned conventional nuclear power plant ventilation facility, when a snowfall or a snowstorm or a blizzard occurs in the area where the nuclear power plant is installed, the snow incorporates an air supply filter 4 from the outside air intake 1 together with the outside air. There is a possibility of being taken into the air supply processing device 5. This snow adheres to the air supply filter 4 and becomes clogged, increasing the pressure difference across the air supply filter 4 and eventually causing the air supply filter 4 to be damaged.
[0007]
  In addition, if a large amount of outside-freezing air is taken into an emergency ventilation facility that does not have an air heating device on the air supply facility side, the air temperature inside the building may be lowered, which may lead to freezing damage to the piping. It was.
[0008]
  SUMMARY OF THE INVENTION The present invention has been made in response to the conventional circumstances, and its purpose is to avoid clogging of the filter due to snow taken in together with outside air from the outside air intake port, and to prevent damage to the filter. A nuclear power plant that is capable of preventing snow intrusion and freezing breakage of piping, etc., even in ventilation equipment that does not have an air heating device on the air supply equipment side, by incorporating a large amount of outside air below freezing point Is to provide ventilation facilities.
[0009]
[Means for Solving the Problems]
  In order to achieve the above object, according to the first aspect of the present invention, in a ventilation facility of a nuclear power plant having an air supply processing device for taking outside air from an outdoor part of the nuclear power plant, an air supply filter inside the air supply processing device includes: Independently provided coils for supplying air for melting snow to the downstream of the filter divided into a plurality of sections and supplied to the building of the nuclear power plant. This system provides a ventilation facility for a nuclear power plant that is capable of circulating operation by heating intake air with a heating coil built in the casing and supplying this air immediately after the outside air intake through a return line. is there.
[0010]
  According to a second aspect of the present invention, in the ventilation facility of the nuclear power plant according to the first aspect, as a device for supplying snow melting air, either a temperature sensor or a snowfall sensor, or both a temperature sensor and a snowfall sensor are provided. The coil is provided independently from the air supply filter device that divides the air supply filter inside the air supply processing device when the outside air temperature change or snowfall occurs, and incorporates the separated air supply filter The air volume control device and blower connected to the casing are activated, and heated air is created by the heating coil built in the coil casing provided independently, upstream of the air supply filter built in the air supply processing device by the return line The heating flow to the heating coil built in the coil casing installed independently by the temperature sensor installed downstream of the air supply filter Ventilation in the flow control valve of the supply line of a nuclear power plant, characterized in that the automatic control enables the temperature of the return airIs to provide.
[0011]
[Action]
  In the nuclear power plant ventilation system configured as described above, if snowfall, snowstorm, or blizzard occurs, and the snow is taken into the air supply system from the outside air intake along with the outside air, the snow that floats in the air is supplied. It is heated by an air supply snow melting device provided in the air processing device to become snow melting water. Moreover, the snowmelt water scattered from the air supply and snow melting device is captured and collected by the snowmelt water treatment device, and is discharged from a drain pipe connected to the air supply and processing device.
[0012]
  On the other hand, the snow accumulated on the floor immediately after the outside air intake is melted by the floor snow melting device installed on the floor and discharged from the drain pipe, and the operation of the floor snow melting device is controlled by the presence or absence of snow and the temperature condition of the air Is possible.
[0013]
  In the case of a configuration with a return line that enables circulating warm-up operation using the heat generated by electrical equipment, the snow taken into the air supply processing device from the outside air intake with the outside air is generated by the heat generated by the electrical equipment. It is melted by the circulating air whose temperature has risen, and is captured and collected by the snowmelt water treatment device installed in the air supply treatment device. Melting snow can be discharged from the drain pipe connected to the air supply processing unit, and by using the heat generated by electrical equipment etc., the outside air taken in from the outside air intake is warmed to prevent the room temperature from dropping Can do. In addition, the amount of circulating air necessary to prevent snow melting and lowering the room temperature is controlled by the mixed air temperature of outside air and circulating air, and an appropriate supply air temperature can be maintained.
[0014]
  Further, in the present invention, when a snowfall or a snowstorm or a snowstorm phenomenon occurs and the snow is taken into the air supply processing apparatus from the outside air intake along with the outside air, the heated air is supplied by the cooling heating coil in the coil casing. Then, a part of the snow is returned to the upstream side of the air supply filter by the return line, the snow taken into the air supply processing device is melted, and the snowmelt water can be discharged from the drain pipe. Further, by controlling the return flow rate from the return line according to the presence or absence of snowfall or the air temperature condition, it is possible to control the snowmelt and the other periods separately.
[0015]
  The air supply filter is divided inside the air supply processing device, and the intake air is heated by a heating coil incorporated in a coil casing provided independently to supply snow melting air downstream of the divided filter, and then returned. Circulating operation by supplying immediately after the outside air intake through the line, and as a device for supplying snow melting air, either a temperature sensor or a snowfall sensor, or both a temperature sensor and a snowfall sensor, When a change in the outside air temperature or snowfall occurs, the air supply filter is separated inside the air supply processing device, and connected to the coil casing provided independently from the air supply filter device that incorporates the separated air supply filter The air volume control device and the blower are activated, and heated air is generated by the heating coil built in the coil casing provided independently, and the return Adjust the flow rate of the heating fluid supply line to the heating coil built in the coil casing, which is returned to the upstream side of the air supply filter built in the air supply processing device by the IN, and installed downstream of the filter by the temperature sensor. It is possible to automatically control the temperature of the return air with a valve and melt the snow taken in the air supply processing unit.be able to.
[0016]
【Example】
  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a ventilation facility for a nuclear power plant according to the present invention will be described with reference to the drawings.
[0017]
  FIG. 1 is a system configuration diagram showing the basic configuration of the present invention. In FIG. 1, the same parts as those in FIG. 11 are denoted by the same reference numerals, and description of the configuration is omitted.
[0018]
  In FIG. 1, the outside air taken in from the outside air intake 1 is guided to the air supply processing device 5. The outside air guided to the air supply processing device 5 passes through the air supply snow melting device 2a, the snow melting water processing device 3, and the air supply filter 4 in this order, and is guided to the air volume adjusting devices 6a, 6b, 6c, and 6d. The air supply and snow melting device 2a may be variously considered depending on the heat source for melting snow. For example, a steam heating coil, a hot water heating coil, an electric heating coil, or the like, or a combination thereof may be used. In this embodiment, an example is shown in which a heat source using a combination of a hot water heating coil and an electric heating coil is used. Therefore, the amount of control of the heat source uses the amount of hot water and the amount of electricity. The amount of hot water used in the air supply and snow melting device 2a is adjusted by a valve opening degree adjusting device 21a and a control valve 22a which operate in response to signals detected by the snowfall sensor 18 and the temperature sensor 19a and signals from the ventilation and snow melting control device 20a. Then, the amount of electricity is adjusted by a power amount adjusting device 32a that operates in response to detection signals from the snowfall sensor 18 and the temperature sensor 19a and a signal from the ventilation and snow melting control device 20a. Note that the control of the amount of steam when heating is performed using the steam heating coil is the same as the control of the hot water described above.
[0019]
  On the other hand, the heater of the floor snow melting device 2b is preferably a hot water pipe, a heating wire, an infrared heater, or a combination thereof. In this embodiment, a hot water pipe and a heating wire are combined to form a heat source, and an example in which the amount of hot water and the amount of power are controlled amounts will be described. The amount of hot water used in the floor snow melting device 2b is adjusted by a valve opening degree adjusting device 21b and a control valve 22b which operate in response to detection signals from the snowfall sensor 18 and the temperature sensor 19b and signals from the floor snow melting control device 20b. The amount of electricity is adjusted by a power amount adjustment device 32b that operates in response to detection signals from the snowfall sensor 18 and the temperature sensor 19b and a signal from the floor snow melting control device 20b. In addition, when heating using an infrared heater, it is the same as that of the control at the time of making said electric quantity into a control example.
[0020]
  In the unlikely event of a failure in the ventilating snow melting device 2a and the floor snow melting device 2b, these snow melting devices are divided into a plurality of parts and installed, and even if some of the snow melting devices fail, other snow melting devices are started. By doing so, continuous operation may be possible. Alternatively, a spare machine (not shown) may be provided separately to enable continuous operation.
[0021]
  In the ventilation facility of the nuclear power plant configured as described above, when snow falls or the like, and the snow and the outside air are taken together from the outside air intake 1 into the air supply processing device 5, the snow floating in the air is It is heated by the air supply snow melting device 2a built in the air supply processing device 5 and becomes snow melting water. This snowmelt water is scattered from the air supply snowmelting device 2 a by the outside air, and is captured and collected by, for example, the snowmelt water treatment device 3 having a water-resistant filter, a demister, etc., and connected via the drain pipe 31 connected to the air supply processing device 5. Discharged. On the other hand, the snow accumulated on the floor immediately after the outside air intake 1 is melted by the floor snow melting device 2 b installed on the floor and discharged from the drain pipe 31.
[0022]
  The amount of power of the air supply and snow melting device 2a is adjusted to an appropriate amount by the snowfall sensor 18, the temperature sensors 19a and 19b, the ventilation and snow melting control device 20a, and the power amount adjusting device 32a. When the steam flow rate or the hot water flow rate is used as the working fluid of the air supply and snow melting device 2a, the valve opening degree adjusting device 21a and the adjusting valve 22a are used instead of the power amount adjusting device 32a.
[0023]
  Similarly, the electric amount of the floor snow melting device 2b is adjusted with the valve opening degree adjusting device 21b by the snowfall sensor 18, the temperature sensor 19b, the floor snow melting control device 20b and the electric energy adjusting device 32b, or instead of the electric energy adjusting device 32b. Adjust by the valve 22b.
[0024]
  Next, control examples of the air supply snow melting device 2a and the floor snow melting device 2b will be described. The air supply snow melting device 2a is controlled by the outlet air temperature of the air supply snow melting device 2a, and the amount of heat when the snow taken together with the outside air melts and evaporates in the air and the amount of heat necessary to heat the outside air to a predetermined temperature. Is supplied as a heating amount. In the case of a hot water coil or a steam coil, the snowfall sensor 18 ensures water flow or ventilation at a minimum flow rate so that the hot water coil or the steam coil itself does not freeze regardless of whether or not snow falls.
[0025]
  The floor snow melting device 2b is controlled by the presence or absence of snowfall. When there is no snowfall, the floor snow melting device 2b is stopped. In the case of the floor snow melting device 2b using a hot water pipe, the ambient air temperature of the floor snow melting device 2b is detected by the temperature sensor 19b. To ensure the minimum water flow rate that prevents the hot water pipe itself from freezing.
[0026]
  In the case where a spare machine is provided, even if a part of the air supply and snow melting device 2a breaks down, the spare machine (not shown) is used as the operating machine, and replacement or repair of the failed machine is performed without stopping the ventilation system. It can be performed. In addition, the attachment method of the air supply snow melting apparatus 2a is demonstrated using FIG. In FIG. 2, the air supply and snow melting device 2 a is bolted to the device mounting base 33. Further, the air supply and snow melting device 2a has suspension brackets 34a and 34b, which are connected to suspension brackets 37a and 37b provided on the installation place upper portion 36 via a lifting device 35 such as a chain block. It is supported. Therefore, replacement / repair work can be easily performed when the air supply and snow melting device 2a fails. Further, by setting the mounting position of the air supply and snow melting device 2a on the downstream side of the partition wall 38, it is possible to prevent freezing of the internal fluid of the pipe directly connected to the air supply and snow melting device 2a or the internal fluid of the valve due to low temperature outside air.
[0027]
  FIG. 3 shows a piping connection diagram around the air supply and snow melting device 2a when a hot water heating coil is used as the heat source of the ventilation and snow melting device 2a. FIG. 3 (a) shows a configuration of an external pipe of a hot water heating coil provided in the ventilation snow melting device 2a. The hot water heating coil is provided with a pipe for supplying hot water and a pipe for discharging hot water. An air vent pipe 39 and a coil drain pipe 40 are provided, and each of these pipes is connected to an exhaust port. Therefore, it is possible to remove bubbles remaining after maintenance of the hot water heating coil, and it is possible to discharge water present in the hot water heating coil during maintenance. FIG.3 (b) has shown the piping connection figure around the ventilation snow melting apparatus 2a at the time of using a steam heating coil for the heat source of the ventilation snow melting apparatus 2a. In the case of the steam heating coil, in addition to the piping for supplying steam and the piping for discharging the return water after the heat is supplied to the melting snow, the venting piping 39 and the coil drain piping as in FIG. 40. In addition, the trap 41 for storing the vapor | steam which could not be condensed is provided in the middle of piping for discharging | emitting return water.
[0028]
  According to the above configuration, the air supply filter 4 by the snow taken in together with the outside air from the outside air intake 1 by the air supply snow melting device 2 a, the floor snow melting device 2 b, and the snow melting water treatment device 3 incorporated in the air supply processing device 5. The air supply filter 4 can be prevented from being damaged without the air supply filter 4 being wetted by the snow melt water being scattered. Further, in the operation control of the air supply snow melting device 2a, the amount of electricity is controlled by the presence or absence of snowfall and the outlet air temperature of the air supply snow melting device 2a, so that an appropriate air temperature can be maintained. The operation control of the floor snow melting device 2b can control the amount of electricity according to the presence or absence of snowfall and the ambient air temperature of the floor snow melting device 2b.
[0029]
  Further, when a spare machine or the like is provided, even if a part of the air supply snow melting device 2a breaks down, the ventilation system can be continuously operated without impairing necessary functions, and the air supply snow melting device 2a can be attached. Since the structure is easy to remove, it is easy to replace the malfunctioning machine. Furthermore, by setting the mounting position of the air supply snow melting device 2a on the downstream side of the partition wall 38, all the piping and valves directly connected to the air supply snow melting device 2a are installed on the downstream side of the partition wall 38 to which the device is attached, Since there is no direct contact with low temperature outside air, there is no risk of freezing of the fluid inside the pipe.
[0030]
  FIG. 4 is a system configuration diagram showing a reference example. 4, the same parts as those in FIGS. 11 and 12 are denoted by the same reference numerals, and description of the configuration is omitted. In FIG. 4, the outside air taken in from the outside air intake 1 and the circulating air from the return line 27 branched from the pipes on the outlet side of the exhaust fans 16a, 16b, 16c, 16d are passed through the snowmelt water treatment device 3 and the air supply filter 4. Mixing is performed in the built-in air supply processing device 5.
[0031]
  The exhaust air volume adjusting device 24 and the circulating air volume adjusting device 26 are a temperature sensor 28 for measuring the temperature of the mixed air of the outside air taken in from the outside air intake 1 and the circulating air from the return line 27, a control device 29, and a valve opening degree adjustment. Controlled by device 30.
[0032]
  In the second embodiment thus configured, when snow is taken in from the outside air intake 1 together with outside air, the snow is melted by the circulating air from the return line 27 heated by the heat generated by the electrical product 23 and the like. The snowmelt water is captured and collected by the snowmelt water treatment device 3 and discharged through the drain pipe 31 connected to the air supply treatment device 5.
[0033]
  Further, the amount of circulating air necessary for preventing snow melting and room temperature decrease is controlled by the mixed air temperature of outside air and circulating air, and maintaining the proper supply air temperature can prevent the room temperature of the building 11 from decreasing. Therefore, the air supply filter 4 can be prevented from being damaged by avoiding clogging of the air supply filter 4 due to the snow taken in from the outside air intake 1 and preventing the air supply filter 4 from getting wet by the melted snow water.
[0034]
  Next, another reference example will be described with reference to FIG. 5, the same parts as those in FIG. 1 are denoted by the same reference numerals, and description of the configuration is omitted. In FIG. 5, a ventilation snow melting device 2 a, a floor snow melting device 2 b, a snow melting water treatment device 3, and an air supply treatment device 5 including a cooling heating coil 8 are installed. In this case as well, the same operations and effects as those of the first embodiment of the present invention are provided, and the description thereof is omitted.
[0035]
  Furthermore, another reference example will be described with reference to FIG. As shown in FIG. 6, the outside air taken in from the outside air intake 1 and the circulating air from the return line 27 are mixed in the air supply treatment device 5 including the snowmelt water treatment device 3 and the air supply filter 4. Blowers 7a, 7b, 7c, and 7d, to which air volume control devices 6a, 6b, 6c, and 6d are connected, are installed in parallel at the outlet of the air processing device 5. The air in which the outlets of the plurality of blowers 7a, 7b, 7c, and 7d are integrated into the air supply duct 10 is blown into the building 11.
[0036]
  The air inside the building 11 rises in temperature due to heat generated by the electrical equipment 23 and the like, and then is guided to the air volume control devices 15a, 15b, 15c, and 15d and the exhaust fans 16a, 16b, 16c, and 16d through the exhaust duct 12. Thereafter, a part of the air is exhausted from the exhaust port 25 via the exhaust air amount adjusting device 24, and the remaining air is returned to the air supply processing device 5 via the circulating air amount adjusting device 26 and the return line 27.
[0037]
  The exhaust air volume adjusting device 24 and the circulating air volume adjusting device 26 are a temperature sensor 28 for measuring the temperature of the mixed air of the outside air taken in from the outside air intake 1 and the circulating air from the return line 27, a control device 29, and a valve opening degree adjustment. It is controlled by the device 30. Since the effect of this embodiment is the same as that of the second embodiment, the description thereof is omitted.
[0038]
  FIG. 7 is a system schematic diagram showing still another reference example.
[0039]
  As shown in FIG. 7, blowers 55a, 55b, and 55c in which outside air is taken in from an outside air intake port 51a, and air volume adjusting devices 54a, 54b, 54c, and 54d are connected to an air supply processing device 53a that incorporates an air supply filter 52a, respectively. 55d are installed in parallel, and a coil casing 57a containing a coil 56a for cooling or heating the outside air is connected to the outlets of the plurality of blowers 55a, 55b, 55c, 55d, and air is supplied via the air supply duct 58a. Harmonized outside air is blown into the building 59a.
[0040]
  The air inside the building 59a is passed through the exhaust duct 60a to a plurality of exhaust treatment devices 62a, 62b, 62c, 62d that contain exhaust filters 61a, 61b, 61c, 61d installed to purify the exhaust air. A plurality of exhaust fans 64a, 64b, 64c, and 64d are installed on the outlet side of the exhaust treatment devices 62a, 62b, 62c, and 62d through the air volume control devices 63a, 63b, 63c, and 63d, respectively. It is integrated at the outlet, connected to the exhaust pipe 65 and discharged.
[0041]
  Part of the heated air that has passed through the cooling and heating coil 56a built in the coil casing 57a is returned to the upstream side of the air supply filter 52a built in the air supply processing device 53a by the return line 68a. Further, the air flow rate adjusting devices 66a and 67a are operated by the valve opening adjusting device 72a based on the detection signal of the temperature sensor 69a or the snowfall sensor 76a and the signal from the control device 70a to control the flow rate of the return line 68a.
[0042]
  According to such a configuration, part of the heated air that has passed through the cooling and heating coil 56a built in the coil casing 57a is returned to the upstream side of the air supply filter 52a built in the air supply processing device 53a by the return line 68a. . Further, the air flow rate adjusting devices 66a and 67a are operated by the valve opening degree adjusting device 71a and the flow rate of the return line 68a is controlled by the detection signal of the temperature sensor 69a and the signal from the control device 70a, so Since the clogging of the air supply filter 52a due to the taken-in snow is avoided, the intake air is warmed, and the return air amount is controlled in accordance with the amount of change in the outside air temperature, an appropriate supply air temperature can be maintained.
[0043]
  Figure 8Other reference examplesFIG.
[0044]
  As shown in FIG. 8, air supply filters 52a and 52b are provided inside the air supply processing device 53a and are provided in a coil casing 57b that is provided independently as snow melting air immediately after the outside air intake 51a. The heated air is heated by the heating coil 56b, and the return line 68b is connected immediately after the outside air entrance to perform circulation operation. Further, as a device for supplying snow melting air, either the temperature sensor 69a or the snowfall sensor 76a, or both the temperature sensor 69a and the snowfall sensor 76a are provided, and a change in the outside air temperature and a change in the weather occur. The air volume control devices 54i and 54j and the blowers 55i and 55j provided downstream of the air supply filter 52b divided inside the air supply processing device 53a are activated and incorporated in a coil casing 57b provided downstream thereof. Heating air is generated by the heating coil 56b and returned to the upstream of the air supply filters 52a and 52b built in the air supply processing device 53a by the return line 68b. The temperature of the return air is adjusted by the flow rate adjusting valve 75 of the heating fluid supply line to the heating coil 56b built in the coil casing 57b installed independently by the temperature sensor 69c installed downstream of the air supply filters 52a and 52b. Automatic control.
[0045]
  According to such a configuration, the heated air that has passed through the heating coil 56b built in the coil casing 57b that is installed independently is returned to the upstream of the air supply filters 52a and 52b in the air supply processing device 53a by the return line 68b. It is. Further, the outside air intake temperature, the temperature sensor 69a and the snowfall sensor 76a are monitored. The temperature sensor 69c installed downstream of the filter receives a signal from the control device 70b, and the flow rate adjusting valve 75 is operated by the opening degree adjusting device 71b. Because of the control, clogging of the air supply filters 52a and 52c due to snow taken together from the outside air intake 51a can be avoided, the intake outside air can be warmed, and an appropriate supply air temperature can be maintained.
[0046]
  Figure 9Other reference examplesFIG.
[0047]
  Air conditioning equipment for clean areas and dirty areas are provided, and air conditioning equipment such as the electrical component room 74 is installed for clean areas. The air taken in from the outside air inlet 61b for the clean area is discharged at the outlets of the blowers 55e, 55f, 55g, and 55h by the flow control devices 54e, 54f, 54g, and 54h and the blowers 55e, 55f, 55g, and 55h. The air is supplied to the building 59b and the electrical component room 74 through the integrated air supply duct 58b. Air heated by the heat generated in the electrical component chamber 74 and the like is exhausted from the exhaust port 73 through the exhaust duct 60b and the exhaust fans 64e and 64f. The exhaust fan 64e, 64f has a duct 68c connected to the air supply processing device 53a for the dirty section downstream, and any one of the temperature sensors 69a, 69b or the snowfall sensors 76a, 76b is used as a device for supplying snow melting air. Alternatively, both temperature sensors 69a and 69b or snowfall sensors 76a and 76b are provided. When changes in the outside air temperature and weather conditions occur, a signal is sent from the control device 70c to the valve opening degree adjustment device 71c, the flow rate adjustment device 76b in the exhaust duct 70b in the clean area, and the air supply processing device 53a for the dirty area. The flow control device 76b installed in the return line 68c is automatically controlled upstream of the air supply filter 52a.
[0048]
  According to such a configuration, the heated exhaust air is returned to the upstream side of the air supply filter 52a built in the air supply processing device 53a for the dirty area by the heat generated in the electrical component room 74 or the like in the clean area. Thus, clogging of the air supply filter 52a built in the air supply processing device 53a for the dirty area can be avoided, and the intake air can be warmed and an appropriate supply air temperature can be maintained.
[0049]
  FIG.Other reference examplesFIG.
[0050]
  Blowers 55a, 55b, 55c, and 55d, in which air volume adjusting devices 54a, 54b, 54c, and 54d are respectively connected to an air supply processing device 53a that incorporates an air supply filter 52a, are provided in parallel. A coil casing 57a containing a coil 56a for cooling or heating the outside air is connected to the outlets of the plurality of blowers 55a, 55b, 55c, 55d, and the outside air conditioned by the air supply duct 58a is supplied to the building 59a. It is blown inside.
[0051]
  The air inside the building 59a is passed through the exhaust duct 60a to a plurality of exhaust treatment devices 62a, 62b, 62c, 62d that contain exhaust filters 61a, 61b, 61c, 61d installed to purify the exhaust air. A plurality of exhaust fans 64a, 64b, 64c, and 64d are installed on the outlet side of the exhaust treatment devices 62a, 62b, 62c, and 62d through the air volume control devices 63a, 63b, 63c, and 63d, respectively. They are integrated at the outlets of the exhaust fans 64a, 64b, 64c, and 64d, connected to the exhaust pipe 65, and discharged.
[0052]
  The air is returned to the upstream side of the air supply filter 52a built in the air supply processing device 53a through the return line 68a from the integrated line at the outlet of the plurality of exhaust fans 64a, 64b, 64c, 64d. Further, the air flow rate adjusting devices 76a and 77a are operated by the valve opening degree adjusting device 71a based on the detection signal of the temperature sensor 69a or the snowfall sensor 76a and the signal from the control device 70a to control the flow rate of the return line 68a.
[0053]
  Of this configurationReference exampleIn order to avoid clogging of the air supply filter 52a due to snow taken together from the outside air intake 51a, to warm the intake outside air and to control the return air amount according to the amount of change in the outside air temperature, Can maintain the correct supply air temperature.
[0054]
【The invention's effect】
  As described above, in the ventilating equipment of the nuclear power plant of the present invention, the snow taken together with the outside air from the outside air intake is melted and drained to prevent the air supply filter from being damaged due to clogging or wetting, and It is possible to prevent the intrusion of snow into the building or the room temperature of a system without a heating device.
[0055]
  Further, according to the ventilation facility of the nuclear power plant according to the present invention, even if snowfall or snowstorm or ground snowstorm phenomenon appears and the snow is taken into the air supply device from the outside air intake along with the outside air, It can be supplied using the return line, and it prevents damage due to clogging of the air supply filter and snow intrusion into the building, or the return air volume is controlled by changes in the outside air temperature, so that an appropriate supply air temperature can be maintained. .
[Brief description of the drawings]
FIG. 1 is a system configuration diagram showing a basic configuration example of a ventilation facility of a nuclear power plant according to the present invention.
FIG. 2A is a configuration diagram showing a mounted state of a ventilation snow melting device, and FIG. 2B is a configuration diagram showing a part of FIG.
3A is a piping configuration diagram when a hot water heating coil is used as a heater of a ventilation snow melting device, and FIG. 3B is a piping configuration diagram when a steam heating coil is used as a heater of the ventilation snow melting device.
FIG. 4 is a system configuration diagram showing a reference example of ventilation equipment of a nuclear power plant.
FIG. 5 is a system configuration diagram showing a reference example of ventilation equipment of a nuclear power plant.
FIG. 6 is a system configuration diagram showing a reference example of ventilation equipment of a nuclear power plant.
FIG. 7 is a system configuration diagram showing a reference example of ventilation equipment of a nuclear power plant.
[Fig. 8]The system block diagram which shows the reference example of the ventilation equipment of a nuclear power plant.
FIG. 9The system block diagram which shows the reference example of the ventilation equipment of a nuclear power plant.
FIG. 10The system block diagram which shows the reference example of the ventilation equipment of a nuclear power plant.
FIG. 11 is a system configuration diagram showing a conventional example of a ventilation facility of a nuclear power plant.
FIG. 12 is a system configuration diagram showing a conventional example of ventilation equipment of a nuclear power plant.
[Explanation of symbols]
1 Outside air intake
2a Ventilation snow melting device
2b Snow melting equipment
3 Snowmelt water treatment equipment
4 Air supply filter
5 Air supply processing device
11 Building
12 Exhaust duct
18 Snowfall sensor
19a, 19b Temperature sensor
20a Ventilation snow melting control device
20b Floor snow melting control device
21a, 21b Valve opening adjustment device
22a, 22b control valve
23 Electrical
24 Discharge air volume control device
26 Circulating air volume control device
27 Return line
28 Temperature sensor
29 Controller
30 Valve opening adjustment device
31 Drainage piping
32a, 32b Electric energy adjustment device
33 Device mounting base
34a, 34b Hanging bracket
35 Lifting equipment
36 Installation location upper part
37 Hanging bracket
39 Air vent piping
40 Coil drain piping
41 trap
51a, 51b Outside air intake
52a, 52b, 52c Air supply filter
53a, 53b Air supply processing device
54a, 54b, 54c, 54d, 54e, 54f, 54g, 54h, 54i, 54j
55a, 55b, 55c, 55d, 55e, 55f, 55g, 55h, 55i, 55j
56a Cooling heating coil
56b Heating coil
57a, 57b Coil casing
58a, 58b Air supply duct
59a, 59b Building
60a, 60b Exhaust duct
61a, 61b, 61c, 61d Exhaust filter
62a, 62b, 62c, 62d Exhaust treatment device
63a, 63b, 63c, 63d Air volume control device
64a, 64b, 64c, 64d, 64e, 64f
65 Exhaust pipe
65a, 65b, 67a, 67b Air volume control device
68a, 68b, 68c, 68d Return line
69a, 69b, 69c Temperature sensor
70a, 70b, 70c control device
71a, 71b, 71c Valve opening adjusting device
72a, 72b Drain piping
73 Exhaust vent
74 Electrical room
75 Flow control valve
76a, 76b Snowfall sensor

Claims (2)

  In a ventilation facility of a nuclear power plant having an air supply processing device that takes in outside air from the outdoor part of the nuclear power plant, the air supply filter inside the air supply processing device is divided into a plurality of parts, and the air from the one divided filter is The intake air is heated by a heating coil built in an independently provided coil casing for supplying snow melting air to the downstream of the filter divided into the other section, which is supplied to the building of the nuclear power plant. A ventilating facility for nuclear power plants, which enables circulation operation by supplying air immediately after the outside air intake through the return line.   The ventilation facility for a nuclear power plant according to claim 1, wherein the device for supplying snow melting air has either a temperature sensor or a snowfall sensor, or both a temperature sensor and a snowfall sensor, When snowfall occurs, the air supply filter is divided inside the air supply processing device, and the air volume adjusting device connected to the coil casing provided independently from the air supply filter device incorporating the divided air supply filter, and The blower is activated and warmed air is created by the heating coil built in the coil casing provided independently, and is returned to the upstream side of the air supply filter built in the air supply processing device by the return line. Flow rate adjustment of the heating fluid supply line to the heating coil built in the coil casing installed independently by the temperature sensor installed downstream Ventilation equipment of the nuclear power plant which is characterized in that the automatic control allows the temperature of the return air at.

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