JPH1048377A - Ventilation and air-condition equipment of central control room system for reactor power plant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the arrangement space of supply air casing, lower the humidity in the casing, protect a blower with humidified air and reduce the mass of humidifier equipment. SOLUTION: In a ventilation and air-conditioning equipment for a central control room in a reactor power plant, humidifier equipments of two systems are combined in one to reduce the mass. In the outside air intake louver 1, two systems of short length supply-air casings 3a and 3b are connected in parallel. In the supply-air casing 3a, an air filter 4 and a cooling coil are arranged in series. At the outlet of the supply-air casing 3a, a blower 7 is connected via a connection duct 6. The discharge sides of the blowers 7 are merged in one system by connecting an supply-air duct 8. In the one system side of the duct, a spray nozzle casing 15 containing spray nozzles 9 is connected. The air blow side of the casing 15 is connected to the central control room system 11 by way of a blow duct 16. The spray nozzles 9 are connected to a humidifier 10 by way of a steam hose 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ventilation and air conditioning system for a central control room of a nuclear power plant.

[0002]

2. Description of the Related Art In each building of a nuclear power plant, ventilation and air conditioning equipment suitable for each system division is installed. Among the,
Ventilation and air-conditioning equipment in the central control room is required to have indoor cooling and humidifying functions to prevent functional loss of indoor equipment due to temperature rise in the central control room and other rooms, and to maintain the working environment for the human body. .

For this reason, a ventilation and air conditioning system for a central control room of a nuclear power plant is provided with two air supply casings having an air filter, a cooling coil, and a humidifier, and one system loses its cooling and humidification functions. However, it is configured so that the cooling and humidifying functions can always be maintained by one spare system.

FIG. 6 illustrates a conventional central control room ventilation and air conditioning system. In FIG. 6, reference numeral 1 denotes one system of an outside air intake louver. An outside air inflow duct 2 branched from the outside air intake louver 1 into two systems divided into an operation side and a standby standby side is connected to the outside air intake louver. The first and second air supply casings 3 are connected to the two systems of the outside air inflow duct 2.

In each air supply casing 3, an air filter 4, a cooling coil 5, and a spray nozzle 9 are sequentially arranged along the downstream side. The spray nozzle 9 is connected via a steam hose 14 to a humidifier 10 installed outside the air supply casing 3. A downstream end of the air supply casing 3 is connected to a suction side of a blower 7 via a connection duct 6, and an air supply duct 8 is connected to a discharge side of the blower 7.

The downstream side of the air supply duct 8 merges into one system, and this one system side is connected to the central control room system 11. A drain 12 is provided in the air supply casing 3 and the humidifier 10.
And a steam pipe 13 and a steam hose 14 are connected to the humidifier 10. The main control room system 11 refers to a main control room and other rooms installed in a building in a nuclear power plant.

Here, the air sucked from the outside air intake louver 1 passes through the outside air inflow duct 2 and is supplied into the air supply casing 3. In the air supply casing 3, first, dust and the like floating in the air are removed by the air filter 4, the temperature is adjusted by the cooling coil 5, and the humidified water vaporized from the humidifier 10 is sprayed and humidified by the spray nozzle 9. .

Then, the humidified air adjusted to a predetermined humidity passes through the connecting duct 6 and is pressurized by the blower 7.
The air is supplied to the central control room and other rooms of the central control room system 11 through the air supply duct 8. The spray nozzle 9 sprays supply water from the humidifier 10. The air supply casing 3 to the blower 7 are divided into two systems, that is, two systems.

[0009]

As described above, two ventilation systems for the central control room of a nuclear power plant are provided in order to multiplex the cooling function as described above. As a result, (1)
Two systems are also provided for the humidifier 10 having no cooling function. (2) Space for the air supply casing 3 including the air filter 4, the cooling coil 5, and the spray nozzle 9 is required for two systems. (3) Since humidification is performed inside the air supply casing 3, there are various problems such as humidification air passing through the blower 7.

The present invention has been made in order to solve the above-mentioned problems, and has a reduced space in which the air supply casing 3 is arranged.
To provide a ventilation and air-conditioning system for a central control room of a nuclear power plant, which can reduce the humidity in the air supply casing 3 and protect the influence of the passage of humidified air on the blower 7 and reduce the amount of equipment for humidification. It is in.

[0011]

According to a first aspect of the present invention, there are provided first and second air supply casings of two systems connected in parallel to an outside air intake louver via an outside air inflow duct, and the first and second air supply casings. An air filter and a cooling coil respectively arranged in series in the air supply casing, and two systems of first and second blowers connected to the outlet sides of the first and second air supply casings via connection ducts, respectively; A T-shaped air supply duct for merging the discharge sides of the first and second blowers into one system of two systems, a spray nozzle connected to one system side of the air supply duct, and the spray nozzle A humidifier connected to a central control room system provided on the outflow side of air whose humidity has been adjusted by humidifying water from the humidifier, and a humidifier connected to the spray nozzle via a steam hose and installed outside the air supply casing With Characterized in that was.

According to the first aspect of the present invention, since the humidifying equipment is installed as one system in the shared duct portion of the air supply casing which is provided with two systems, any one of the air cooling facilities is operated. Nevertheless, humidification equipment can be maintained for air supply to the central control room and other rooms.

According to a second aspect of the present invention, the cooling coil comprises a heat transfer tube connected to a cooling water inlet and a cooling water outlet of the emergency cooling water system for the ventilation and air conditioning auxiliary equipment. It is characterized by being arranged in the air supply casing so as to be sprayed.

According to the second aspect of the present invention, the cold water supplied from the cold water inlet flows through the heat transfer tube coil. The supply air temperature can be adjusted by blowing the outside air intake air onto the heat transfer tube coil. The cold water that has passed through the heat transfer tube coil and has increased in temperature returns to the refrigerator from the cold water outlet and is cooled.

According to a third aspect of the present invention, the spray nozzle is provided in the spray nozzle casing so as to blow out humidified water vaporized in a direction substantially perpendicular to the direction of air flow, and communicates with the inside of the spray nozzle. A condensed water hose is connected.

According to the third aspect of the present invention, by incorporating the spray nozzle in the air supply duct, the air that has passed through the air supply casing and has been pressurized by the blower can be humidified on the line of the air supply duct. .

According to a fourth aspect of the present invention, the humidifier has a humidifying casing, a steam cylinder having a drainage solenoid valve provided in the humidifying casing, and a steam provided above the steam cylinder and connected to the spray nozzle. It is characterized by comprising a hose and a water supply electromagnetic valve, and a water collecting cap connected to the water supply electromagnetic valve and connected to the condensed water hose.

According to the fourth aspect of the present invention, tap water is supplied into the steam cylinder to be heated and vaporized. The vaporized humidified water containing water from the water collecting cap is sprayed from the spray nozzle into the spray nozzle casing via the steam hose, and humidifies the air from the blower. The condensed water condensed in the spray nozzle flows through the condensed water hose and flows into the water collecting cap. The condensed water stored in the steam cylinder is drained by opening a drain solenoid valve.

The invention according to claim 5 is characterized in that the humidifying casing is provided with an operation switch for operating the steam cylinder and a digital display. According to the fifth aspect of the present invention, the operation of the steam cylinder can be performed via the operation switch according to the contents displayed on the digital display unit in the fourth aspect.

According to a sixth aspect of the present invention, there are provided two systems of first and second air supply casings connected in parallel to an outside air intake louver through an outside air inflow duct, and the first and second air supply casings respectively. An air filter, a cooling coil, and a spray nozzle, which are sequentially arranged in series, two first and second blowers connected to the outlet sides of the first and second air supply casings via connection ducts, respectively, A T-shaped air supply duct that joins the discharge sides of the first and second blowers to combine the two systems into a single system and connects to the central control room system, and joins the inflow sides of the humidifying water of the respective spray nozzles And a humidifier connected to the three-way switching valve.

According to the sixth aspect of the present invention, the spray nozzles respectively installed in the two-system air supply casings are joined by the pipe switching valve, a steam hose is connected to the pipe switching valve, and the steam hose is humidified. Connected to the container. Therefore, the inside of two water supply casings can be sprayed by one humidifier, and the humidified air can be sent from the blower to the central control room and other rooms.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a ventilation and air conditioning system for a central control room of a nuclear power plant according to the present invention will be described with reference to FIGS. In FIG. 1, the same portions as those in FIG. 6 or portions having the same functions are denoted by the same reference numerals. That is, the outside air intake louver 1 of one system is connected to an outside air inflow duct 2 whose downstream side is branched into two systems, and the first and second short air supply casings are respectively connected to the two systems side of the outside air inflow duct 2. 3a and 3b are connected in parallel.

In the first and second short supply casings 3
The air filter 4 and the cooling coil 5 are arranged in series at a and 3b. The cooling coil 5 is connected to a pipe (not shown) through which chilled water flows in a ventilation air conditioning auxiliary equipment emergency cooling water system (HECW). A blower 7 is connected to the outlet side of the first and second short air supply casings 3a and 3b via a connection duct 6.

An air supply duct 8 is connected to the discharge side of the blower 7 so as to join two systems of air flow paths into one system. A spray nozzle casing 15 in which a spray nozzle 9 is arranged is connected to one system side of the air supply duct 8.
An outlet duct 16 connected to the central control room system 11 is provided on the outlet side of the outlet. The main control room system 11 refers to a main control room and other rooms installed in a building in a nuclear power plant.

The spray nozzle 9 has a spray nozzle 9
A steam hose 14 that connects the humidifier 10 and the humidifier 10 is connected. Drains 12 are provided on the bottom surfaces of the first and second short air supply casings 3a and 3b on the cooling coil 5 side and on the bottom surfaces of the spray nozzle casing 15 and the humidifier 10, respectively. A tap water pipe 13 is connected to the humidifier 10.

As shown in the side view of FIG. 2 (a) and the sectional view taken along the line AA in FIG. 2 (b), the cooling system coil 5 is formed from the heat transfer tube 17 wound spirally. Has become. The heat transfer pipe 17 is provided with a cooling water inlet pipe 18 and a cooling water outlet pipe 19 connected to a cooling water inlet pipe and a cooling water outlet pipe (not shown) of a ventilation air conditioning auxiliary equipment emergency cooling water system (HECW) of a nuclear power plant. And an air vent 20 and a drain vent 21.

As shown in FIG. 3, a spray nozzle 9 for spraying humidified water vaporized in a direction substantially perpendicular to the air flow direction is provided in the spray nozzle casing 15 and communicates with the tip of the spray nozzle 9. A condensed water hose 22 is drawn out of the spray nozzle casing 15. The condensed water hose 22 is for discharging the condensed water condensed into the spray nozzle casing 15.

Normally, HECW is used as the cooling water for the cooling coil in the central control room. The cooling water supplied from the cooling water inlet pipe 18 flows through the heat transfer pipe 17. Then, the supply air temperature is adjusted by blowing in outside air. The cooling water that has passed through the heat transfer pipes 17 and has increased in temperature returns from the cooling water outlet pipe 19 to a refrigerator (not shown) and is cooled.

Further, the humidifier 10 is, as shown in FIG.
A steam cylinder 24 is installed in the humidifying casing 23. The steam cylinder 24 has an upper portion connected to a water supply solenoid valve 25 and a lower portion connected to a drainage solenoid valve 26. A water collecting cap 27 is provided so as to be connected to the water supply electromagnetic valve 25, and a digital display unit 28, an operation switch 29, and an indicator light 30 are provided at a lower part in the humidifying casing 23.

However, in the first embodiment shown in FIGS. 1 to 4, the first short air supply casing 3a will be referred to as the operating side, and the second short air supply casing 3b will be referred to as the spare side. The air sucked from the outside air intake louver 1 passes through the outside air inflow duct 2 and is supplied into the first short air supply casing 3a. In the casing 3a, first, dust and the like floating in the air are removed by the air filter 4, and then the temperature is adjusted by the cooling coil 5.

After passing through the connecting duct 6, the blower 7
Is pressurized by the spray nozzle 9 in the spray nozzle casing 15 provided on the line of the air supply duct 8, and then humidified through the blow duct 16 to the central control room system.
11 is supplied. The spray nozzle 9 sprays the supply water from the humidifier 10 through the steam hose 14.

The spray nozzle 9 can be provided directly in the air duct 8 without being provided in the spray nozzle casing 15. In this case, since the spray nozzle casing 15 can be omitted, the amount of humidifying equipment can be reduced.

As shown in FIG. 4, the humidifier 10 sprays the humidified water vaporized by the steam cylinder 24 from the spray nozzle 9 through the steam hose 14 into mist to humidify the air. The condensed water condensed in the spray nozzle 9 is returned from the condensed water hose 22 to the water collecting cap 27. The operation of the humidifier 10 is performed via the operation switch 29 according to the display contents of the digital display unit 28. The confirmation of the operation switch 29 is performed on the indicator light 30.

According to the first embodiment, only the air filter 4 and the cooling coil 5 are provided in the first and second short air supply casings 3a and 3b, and the humidifying spray nozzle 9 is omitted. Therefore, the size of the air supply casing can be reduced.
In addition, the amount of humidifying equipment can be reduced by using one humidifying equipment.

Next, a second embodiment of a ventilation and air conditioning system for a central control room of a nuclear power plant according to the present invention will be described with reference to FIG. In FIG. 5, the same portions as those in FIGS. 1 to 4 and 6 are denoted by the same reference numerals, and the description of the overlapping portions will be omitted.

The difference between the second embodiment and the conventional example shown in FIG. 6 is that the second embodiment is made from the viewpoint of integrating the humidifying equipment into one system. The inflow side of the humidifying water of the spray nozzle 9 is connected to two sides of the three-way switching valve 31, and one end of the steam hose 14 is connected to one of the three-way switching valves 31.
That is, the other end of 14 is connected to one humidifier 10 to form one system. The other parts are the same as in FIG.

In FIG. 5, the air sucked from the outside air intake louver 1 passes through the outside air inflow duct 2 and is supplied into the air supply casing 3. In the air supply casing 3, first, dust and the like floating in the air are removed by the air filter 4, the temperature is adjusted by the cooling coil 5, and the spray nozzle 9 is removed.
Humidified by

Then, the pressure passes through the connecting duct 6, is boosted by the blower 7, and is supplied to the central control room system 11 through the air supply duct 8. The supply water from the humidifier 10 is sprayed by opening the three-way switching valve 31 to the spray nozzle 9 for the air supply equipment on which the blower 7 is operating.

According to the present embodiment, the spray nozzle 10 in the air supply casing 3, which is divided into two systems, is connected to the three-way switching valve 31, and this three-way switching valve 31 is provided as a humidifying facility. Since it is connected to the vessel 10 via the steam hose 14 to form a single system, the amount of humidifying equipment can be reduced.

[0040]

According to the present invention, the humidity in the air supply casing is reduced by unifying the humidification equipment in the air supply casing having two systems in the ventilation air conditioning system of the central control room in the nuclear power plant. In addition, it is possible to protect the blower from being affected by the passage of the humidified air and to reduce the amount of humidification equipment.

Since the humidifier does not have a cooling function, it is not necessary to use two systems. Therefore, when the air filter and the cooling coil are provided without providing the humidifying spray nozzle in the air supply casing. Can be made shorter than the conventional air supply casing, so that the space for disposing the air supply casing can be reduced.

Also, an air filter is provided in the air supply casing.
Even if a cooling coil and a humidifying spray nozzle are provided, if the inflow side of the humidifying water of the spray nozzle is integrated into one system, a single humidifier can be used, and the amount of humidifying equipment can be reduced.

[Brief description of the drawings]

FIG. 1 is a system diagram showing a first embodiment of a ventilation and air conditioning system for a central control room of a nuclear power plant according to the present invention.

2A is a side view showing a cooling coil in FIG. 1, and FIG. 2B is a cross-sectional view taken along the line AA in FIG.

3A is a side view showing the spray nozzle casing in FIG. 1, and FIG. 3B is a sectional view taken along the line AA in FIG. 3A.

FIG. 4 is a front view showing the humidifier in FIG. 1;

FIG. 5 is a system diagram showing a second embodiment of a ventilation and air conditioning system for a central control room of a nuclear power plant according to the present invention.

FIG. 6 is a system diagram showing a conventional central control room ventilation and air conditioning system of a nuclear power plant.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... External air inlet louver, 2 ... External air inflow duct, 3 ... Air supply casing, 3a ... First short air supply casing, 3b ...
Second short casing, 4 ... air filter, 5 ... cooling coil, 6 ... connecting duct, 7 ... blower, 8 ... air supply duct,
9 ... spray nozzle, 10 ... humidifier, 11 ... central control room system, 12 ...
Drain, 13 ... tap water piping, 14 ... steam hose, 15 ... spray nozzle casing, 16 ... blow-out duct, 17 ... heat transfer tube, 18 ...
Cooling water inlet pipe, 19… Cooling water outlet pipe, 20… Air vent, 21… Drain drain, 22… Condensed water hose, 23… Humidifying casing, 24…
Steam cylinder, 25 ... Solenoid valve for water supply, 26 ... Solenoid valve for drainage, 27 ...
Water collecting cap, 28 ... display, 29 ... operation switch, 30 ... indicator light, 31 ... three-way switching valve.

Claims (6)

[Claims] A first and a second air supply casing connected in parallel to an outside air intake louver via an outside air inflow duct, and an air filter arranged in series in the first and the second air supply casing, respectively. And a cooling coil, two systems of first and second blowers connected to the outlet sides of the first and second air supply casings via connection ducts, respectively, and discharge sides of the first and second blowers. T-shaped air supply system duct that merges the two systems into one system, a spray nozzle connected to one system side of this air supply system duct, and air humidified from this spray nozzle Nuclear power generation, comprising: a blow duct connected to a central control room system provided on a side of the fuel tank; and a humidifier connected to the spray nozzle via a steam hose and installed outside the air supply casing. Place Central control room ventilation and air conditioning equipment. 2. The cooling coil comprises a heat transfer pipe connected to a cooling water inlet and a cooling water outlet of a ventilation air conditioning auxiliary equipment emergency cooling water system, and the heat transfer pipe is so formed as to blow outside air into its outer peripheral surface. The ventilation and air conditioning system for a central control room of a nuclear power plant according to claim 1, wherein the ventilation and air conditioning system is arranged in an air supply casing. 3. The spray nozzle is provided in a spray nozzle casing so as to blow out humidified water vaporized in a direction substantially perpendicular to a flow direction of air, and is connected to a condensate water hose communicating with the inside of the spray nozzle. Ventilation and air conditioning equipment for a central control room of a nuclear power plant. 4. The humidifier includes a humidifying casing, a steam cylinder having a drain solenoid valve provided in the humidifying casing, a steam hose provided above the steam cylinder and connected to the spray nozzle, and a water supply solenoid valve. And a water collecting cap connected to the water supply solenoid valve and connected to the condensed water hose. 5. The ventilation and air conditioning system for a central control room of a nuclear power plant according to claim 4, wherein an operation switch for operating said steam cylinder and a digital display are provided on said humidifying casing. 6. An air system which is connected in parallel to an outside air intake louver via an outside air inflow duct and has two systems of first and second air supply casings, and air sequentially arranged in series with the first and second air supply casings, respectively. Filters, a cooling coil and a spray nozzle, two systems of first and second blowers connected to the outlet sides of the first and second air supply casings via connection ducts, respectively, and the first and second blowers. A T-shaped air supply duct that merges the discharge side of the blower to combine the two systems into one system and connects to the central control room system, and a three-way switch that merges and connects the inflow sides of the humidifying water of the respective spray nozzles A central control room ventilation and air conditioning system for a nuclear power plant, comprising: a valve; and a humidifier connected to the three-way switching valve.