JPH09133788A - Ventilator and air conditioner for central control room of nuclear power plant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve reliability and reduce cost by eliminating many ventilation fans forming a system for the simplification thereof. SOLUTION: An air supply duct 4 with an air supply fan 2 and an air supply easing 3 sequentially connected in series is connected to a central control room 1. One end of a recirculation duct 5, on the other hand, is connected to the central control room 1 for the exhaust thereof and the other end of the duct 5 is connected to the suction side of the air supply fans 2. Also, a duct 6 for drawing a small amount of the fresh air as well as a fresh air intake duct 13 is connected in parallel to a duct branched from a position between the suction side of the air supply fan 2 and the recirculation duct 5. Furthermore, a recirculation fan 9 and a recirculation filter 10 are connected in series in such a state as branched from the recirculation duct 5, and the outlet of the recirculation filter 10 is bypassed to the recirculation duct 5. An exhaust duct 16 is connected in such a state as branched from a position between the recirculation fan 9 and the recirculation filter 10, and an exhaust fan outlet damper 15 and an exhaust port 17 are connected to the exhaust duct 16.

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 that controls operations of a nuclear reactor system and a turbine system.

[0002]

2. Description of the Related Art Various data during operation are sent from a nuclear power plant central control room to various facilities such as reactor system and turbine system facilities. These are displayed on a color CRT on the central control panel, an indicator lamp or a meter so that the operating status of each part of the nuclear power plant can be seen at a glance.

Since an operator is always stationed in the central control room of a nuclear power plant, the ventilation and air conditioning equipment removes loads such as control panels and huge lights installed in the central control room. , The living environment is taken into consideration so that the operator can live for a long time.

On the other hand, even in an emergency of a nuclear power plant, it has been considered to reduce the radiation exposure of operators by providing a device capable of removing radioactive materials. Therefore, in a nuclear power plant, ventilation ventilation and air conditioning equipment for a central control room is considered. Has been installed.

A conventional ventilation air conditioning system for a central control room of a nuclear power plant will be described with reference to FIG. In FIG.
Reference numeral 1 denotes a central control room, which takes in the air supply duct 4 from the air supply fan 2 that supplies air to the central control room 1, and the air supply that has flowed into the central control room 1. A recirculation duct 5 for returning to the air supply fan 2 for circulation,
Small outside air intake duct 6 branched from recirculation duct 5 and connected, small outside air intake 8 having a pair of dampers 7 connected to this small outside air intake duct 6 and having a motor, and small outside air intake The outside air intake in which two recirculation fans 9 and recirculation filters 10 connected to the downstream side of the intake duct 6 and two dampers 11 branching from between the recirculation duct 5 and the air supply fan 2 and equipped with a motor are connected in series. An outside air intake duct 13 having an inlet 12,
It comprises an exhaust fan 14 connected to the main control room 1, an exhaust duct 16 and an exhaust port 17 that connect an exhaust fan outlet damper 15 in series.

Here, two air supply fans 2, an air supply casing 3, a small amount of outside air intake damper 7, a recirculation fan 9, an exhaust fan 14 and an exhaust fan outlet damper 15 are connected in parallel, and usually one unit is provided. Only one is in operation, the other is on standby.

In this ventilation air conditioning equipment, during normal operation of the nuclear power plant, the exhaust air from the main control room 1 is cooled by the air supply fan 2 through the recirculation duct 5 by the operation of the air supply fan 2 or by the air supply casing 3. It heats and humidifies and blows air to the main control room 1.

Although this ventilation and air conditioning equipment is recirculated, a part of exhaust air is taken in and a part of outside air is taken in so as to always maintain a clean state. That is, from the central control room 1 to the exhaust fan 14
The amount of returning to the recirculation duct 5 by directly discharging a part to the atmosphere by the operation of is small by the amount of forced exhaust from the air volume of the air supply fan 2. Therefore, an amount equal to the amount directly discharged to the outside by the exhaust fan 14 from the outside air inlet 12 flows in and is blown to the main control room 1.

On the other hand, in an emergency of the plant, the intake amount and the exhaust amount of the outside air are smaller than those in the normal state, so that the following occurs. The air supply fan 2, the recirculation fan 9, and the exhaust fan 14 are all in an operating state, and the damper relationship is that the outside air intake 12 is fully opened, the outside air small amount intake 8 is opened, and the recirculation fan 9 is continuously operated. After being treated by the recirculation filter 10 while taking in outside air from the small amount of outside air intake port 8, it is blown into the main control room 1 through the air supply fan 2.

In this case, the exhaust fan 14 operates regardless of normal use or emergency use, but the opening is adjusted by the exhaust fan outlet damper 15 provided on the discharge side of the exhaust fan 14 to adjust the exhaust amount according to the mode. Can be secured. In this case, it is necessary to control to 1/10 of the normal state in an emergency, which is difficult in terms of fan performance.

[0011]

According to the conventional ventilation and air-conditioning equipment, in the emergency of the main control room 1, there are always three systems of air supply fan 2, exhaust fan 14 and recirculation fan 9, each of which is provided. It is necessary to equip the outside air intakes 8 and 12 and the exhaust port with butterfly valves.

Further, the exhaust fan 14 needs to be controlled to 1/10 of the normal mode in the emergency mode, which is very difficult in terms of fan performance, and the number of exhaust fans forming the system is large. There is a problem that is complicated and unfavorable for maintaining reliability.

The present invention has been made in order to solve the above-mentioned problems, and is one-third in case of an emergency when the performance of the exhaust fan is difficult.
With the aim of satisfying the role of the conventional air supply fan and recirculation fan as a system, we have stopped controlling the capacity to 10 and simplified the system to improve reliability and reduce construction costs. It is to provide the ventilation and air-conditioning equipment for the central control room.

[0014]

According to the present invention, there is provided an air supply duct in which an air supply fan for supplying air to a central control room and an air supply casing are sequentially connected in series, a suction side of the air supply fan, and the central control room. A recirculation duct connected between the recirculation duct and the suction side of the air supply fan, and a small outside air intake duct and an outside air intake duct that are connected in parallel to the duct. A recirculation fan and a recirculation filter branched from the recirculation duct and bypass-connected to the recirculation duct; and an exhaust duct branched and connected between the recirculation fan and the recirculation filter. And

An air supply duct in which an air supply fan for supplying air to the main control room and an air supply casing are sequentially connected in series,
A recirculation duct connected between the suction side of the air supply fan and the central control chamber, and an outside air intake duct branched and connected between the recirculation duct and the suction side of the air supply fan. , A recirculation fan and a recirculation filter branched from the recirculation duct and bypass-connected to the suction side of the air supply fan, and outside air branched and connected between the recirculation duct and the suction side of the recirculation fan A small quantity intake duct,
An exhaust duct branched and connected between the recirculation fan and the recirculation filter is provided.

Further, an air supply duct in which an air supply fan and an air supply casing for supplying air to the main control room are sequentially connected in series, and a recirculation duct connected between the suction side of the air supply fan and the main control room. An outside air intake duct branched and connected between the recirculation duct and the suction side of the air supply fan; and an exhaust duct branched and connected between the air supply fan and the air supply casing. And a recirculation fan and a recirculation filter branched from the recirculation duct and bypass-connected to the suction side of the air supply fan, and a branch and a connection between the suction side of the recirculation fan and the recirculation duct. And a duct for taking in a small amount of outside air.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of a ventilation and air conditioning equipment for a central control room of a nuclear power plant according to claim 1 of the present invention will be described with reference to FIG.
An embodiment will be described. In FIG. 1, the same parts as those in FIG. 5 are designated by the same reference numerals.

In FIG. 1, an air supply duct 4 in which an air supply fan 2 and an air supply casing 3 are sequentially connected is connected to a central control room 1. Air supply fan 2 and air supply casing 3
Two are provided and are connected in parallel. Also, one end of the recirculation duct 5 is connected to the main control room 1,
The other end of the recirculation duct 5 is connected to the suction side of the air supply fan 2. A small amount of outside air intake duct 6 and an outside air intake duct 13 are connected in parallel by branching from between the recirculation duct 5 and the suction side of the air supply fan 2.

Two small outside air intake dampers 7 are connected in parallel to the small outside air intake duct 6, and a small outside air intake 8 is connected in series to the small outside air intake damper 7. The two outside air intake dampers 11 are connected in series to the outside air intake duct 13 and the outside air intake 12 is connected in series to the outside air intake damper 11.

Two recirculation fans 9 branch from the recirculation duct 5 and are connected in parallel, a recirculation filter 10 is connected to the discharge side of the recirculation fan 9, and the discharge side of the recirculation filter 10 is recirculated. It is connected to the duct 5 by-pass. The exhaust duct is branched from between the recirculation fan 9 and the recirculation filter 10.
16 are connected, two exhaust fan outlet dampers 15 are connected in parallel to the exhaust duct 16, and the exhaust outlets are connected to these outlet dampers 15.
17 connected.

Here, the outside air intake 12 and the small amount of outside air intake 8 are commonly used on the suction side of the air supply fan 2, and the outside air is introduced by the suction force of the air supply fan 2. On the other hand, exhaust gas from the main control chamber 1 is shared by the exhaust port 17 on the discharge side of the recirculation fan 9 and the small amount of outside air intake port 8, and is discharged by the discharge pressure of the recirculation fan 9 and supplied from the recirculation filter 10. Circulate to casing 3.

Next, the operation of the ventilation and air conditioning equipment according to the above configuration will be described below. Air supply fan 2 during normal plant operation
The exhaust air from the main control room 1 is guided to the air supply fan 2 through the recirculation duct 5 by the operation of the above. However, the outside air intake 12 (small amount of outside air intake) installed on the intake side of the air supply fan 2 A predetermined outside air is introduced from (8 is closed), is mixed with the return air flowing from the main control room 1 through the recirculation duct 5, flows through the air supply fan 2 and the air supply casing 3, and is passed through the air supply duct 4 to the central control room. It is blown to 1.

On the way, the air supply casing 3 is heated, humidified, and cooled to perform processing so that the central control room 1 can be maintained at a predetermined temperature and humidity, and then blown into the central control room 1. In addition, the amount of outside air introduced from the outside air intake 12 on the intake side of the air supply fan 2 is reduced by the operation of the recirculation fan 9 to the exhaust port 17
Is discharged directly to the outdoors. In this way, the recirculation fan 9
Ventilation and cooling are performed by operating even during normal plant operation.

On the other hand, when the plant is in an emergency, the air supply fan 2 is operated to perform the necessary heating, humidification, or cooling treatment on the air supply air in the air supply casing 3, and then the air flows into the main control room 1. Outside air intake installed on the suction side of
12 is closed, and outside air is introduced through the small amount intake 8 of outside air.

Exhaust gas from the main control room 1 is recirculated fan 9
1/10 of the capacity of the air supply fan 2 is separated from the recirculation duct 5 and the exhaust port on the discharge side of the recirculation fan 9
It is discharged from 17 to the outdoors. In this case, it is slightly opened by the valve of the exhaust port 17, and an amount equal to the small intake amount of outside air is discharged. Most of the exhaust gas delivered by the recirculation fan 9 is filtered by the recirculation filter 10, is blown to the air supply fan 2, and is again fed to the main control room 1 by the air supply fan 2.

According to the first embodiment, a large number of conventionally installed exhaust fans are deleted and a recirculation fan is provided instead of the exhaust fans, thereby simplifying the system and improving reliability and cost. It can be reduced.

Next, referring to FIG. 2, a second embodiment of the ventilation air conditioning equipment according to claim 2 of the present invention will be described. FIG.
In the main control room 1, an air supply duct 2 in which an air supply fan 2 and an air supply casing 3 are sequentially connected is connected. Two supply fans 2 and intake casings 3 are provided and connected in parallel. Further, one end of the recirculation duct 5 is connected to the main control room 1, and the other end of the recirculation duct 5 is connected to the suction side of the intake fan 2.

An outside air intake duct 13 is connected by branching from between the recirculation duct 5 and the intake side of the intake fan 2, and two outside air intake dampers 11 are connected in series to this outside air intake duct 13. The outside air intake 12 is connected to the outside air intake damper 11.

Two recirculation fans 9 branch from the recirculation duct 5 and are connected in parallel, a recirculation filter 10 is connected to the discharge side of the recirculation fan 9, and the discharge side of the recirculation filter 10 is recirculated. It is connected to the duct 5 by-pass. A small amount of outside air intake duct 6 is connected to branch from between the recirculation duct 5 and the suction side of the recirculation fan 9, and two small amounts of outside air intake are connected to the small amount of outside air intake duct 6. The damper 7 is connected in parallel, and the outside air small amount intake 8 is connected to the outside air small amount intake damper 7.

Further, an exhaust duct 16 is branched from between the discharge side of the recirculation fan 9 and the recirculation filter 10 and two exhaust fan outlet dampers 16 are connected in parallel to the exhaust duct 16. The exhaust port 17 is connected to the exhaust fan outlet damper 16.

In the second embodiment, only the outside air inlet 12 connected to the suction side of the air supply fan 2 is used for air supply, and the outside air is introduced by the suction force of the air supply fan 2 during normal plant operation. It has become.

By the operation of the recirculation fan 9, exhaust gas is discharged from the exhaust port 17 connected to the discharge side of the recirculation fan 9 in an amount equal to the intake amount of outside air (the capacity of the recirculation fan 9 is equal to the discharge amount). .

On the other hand, a small amount of outside air intake 8 in case of a plant emergency
Is on the suction side of the recirculation fan 9 and the outside air is introduced by the suction force of the recirculation fan 9. The exhaust gas is discharged from the exhaust port 17 provided on the discharge side of the recirculation fan 9 by the operation of the recirculation fan 9. In this case, the valve of the exhaust port 17 is slightly opened, an amount equal to the small intake amount of outside air is discharged, and most of the capacity of the recirculation fan 9 is filtered by the recirculation filter 10 to supply air. Guided to fan 2.

In the second embodiment, as compared with the first embodiment, even if a small amount of outside air is taken in, 1/10 of it is exhausted, so the capacity of the recirculation fan 9 is correspondingly increased. Need to be bigger.

Next, referring to FIG. 3, a third embodiment of the ventilation and air conditioning equipment according to claim 3 of the present invention will be described. FIG.
In the central control room 1, an air supply duct 4 in which an air supply fan 2 and an air supply casing 3 are sequentially connected is connected. One air supply fan 2 and one air supply casing 3 are provided and connected in parallel. The exhaust duct is branched from between the air supply fan 2 and the air supply casing 3.
16 is connected, and the exhaust fan outlet damper 15 is connected to the exhaust duct 16.
And the exhaust port 17 are connected in series.

Further, one end of the recirculation duct 5 is connected to the main control room 1, and the other end of the recirculation duct 5 is connected in series to the suction side of the air supply fan 2. The outside air intake duct 13 is connected by branching from between the recirculation duct 5 and the intake side of the air supply fan 2, and two outside air intake dampers 11 are connected in series to the outside air intake duct 13. The outside air intake 12 is connected to the outside air intake damper 11.

On the other hand, two recirculation fans 9 branched from the recirculation duct 5 are connected in parallel, a recirculation filter 10 is connected to the discharge side of the recirculation fan 9, and the discharge side of the recirculation filter 10 is It is connected to the recirculation duct 5 by-pass. An outside air small amount intake duct 6 is connected to branch from between the recirculation duct 5 and the suction side of the recirculation fan 9, and two outside air intake dampers 7 are connected to the outside air small amount intake duct 6. A small amount of outside air intake 8 is connected to the outside air intake damper 7 connected in parallel.

In the present embodiment, air is supplied only to the outside air inlet 12 connected to the suction side of the air supply fan 2, and the outside air is introduced by the suction force of the air supply fan 2 during normal plant operation. There is. By the operation of the air supply fan 2, exhaust gas is discharged from the exhaust port 17 connected to the discharge side of the air supply fan 2 in an amount equal to the intake amount of outside air.

On the other hand, when the plant is in an emergency, the small amount of outside air intake 6 connected to the suction side of the recirculation fan 9 causes the recirculation fan 9 to flow.
The outside air is introduced by the suction force of (the outside air intake 12 is closed by a valve). Exhaust air is on the outlet side of the air supply fan 2 exhaust side 17
Emitted from. In this case, the valve provided at the exhaust port 17 is slightly opened, and an amount equal to the small intake amount of outside air is discharged.

According to the present embodiment, as compared with the first embodiment, part of the outside air is discharged before being blown into the main control room 1 both in an emergency of the plant and at all times. The capacities of the air fan 2, the recirculation filter 10 and the recirculation fan 9 need to be slightly increased. However, the benefits of removing the exhaust fan are greater.

Next, referring to FIG. 4, a description will be given of a fourth embodiment of the ventilation port adjusting equipment according to claim 4 of the present invention. FIG.
In the central control room 1, an air supply duct 4 in which an air supply fan 2 and an air supply casing 3 are sequentially connected is connected. Two air supply fans 2 and three air supply casings 3 are provided and connected in parallel. The exhaust duct is branched from between the air supply fan 2 and the air supply casing 3.
16 is connected, and the exhaust fan outlet damper 15 is connected to the exhaust duct 16.
And the exhaust port 17 are connected in series.

Further, one end of the recirculation duct 5 is connected to the main control room 1, and the other end of the recirculation duct 5 is connected in series to the suction side of the air supply fan 2. Two recirculation fans 9 branch from the recirculation duct 5 and are connected in parallel, a recirculation filter 10 is connected to the discharge side of the recirculation fan 9, and the discharge side of the recirculation filter 10 is connected to the recirculation duct 5. Bypass is connected.

An outside air intake duct 13 and an outside air small amount intake duct 6 are connected in parallel by branching from between the recirculation duct 5 and the suction side of the recirculation fan 9. Outside air intake duct
Two external air intake dampers 11 are connected in series to 13 and an external air intake 12 is connected to the external air intake damper 11, and two external air small amount intakes are connected to the external air small amount intake duct 6. A damper 7 for air is connected in parallel, and a small amount of outside air intake 8 is connected to the damper 7 for small amount of outside air intake.

The supply air according to the present embodiment is a recirculation fan 9
The outside air intake 12 is provided on the suction side of the outside air, and the outside air is introduced by the suction force of the air supply fan 2 during the normal operation of the plant (the outside air small amount intake 8 is fully opened). Exhaust air is on the discharge side of the air supply fan 2 due to the operation of the air supply fan 2.
An amount equal to the intake amount of outside air is discharged from 17.

On the other hand, when the plant is in an emergency, outside air is introduced from the small amount of outside air intake 8 provided on the suction side of the recirculation fan 9 by the suction force of the recirculation fan 9 (the outside air intake 12 is closed by a valve). Exhaust gas is discharged from an exhaust port 17 on the discharge side of the air supply fan 2. In this case, the valve provided at the exhaust port 17 is slightly opened, and an amount equal to the small intake amount of outside air is discharged.

The effect of this embodiment is similar to that of the third embodiment, and even in an emergency of the plant or at all times, part of the outside air is discharged before being blown into the main control room 1. Therefore, the air supply fan 2, recirculation filter
10. It is necessary to slightly increase the capacity of the recirculation fan 9. However, the advantage of removing the exhaust fan is greater.

[0047]

According to the present invention, by replacing the function of the exhaust fan or slightly increasing the other capacity,
The exhaust fan conventionally provided in the central control room can be eliminated. As a result, the construction cost can be reduced in combination with the improvement of reliability in addition to the simplicity of control by reducing the number of system components.

[Brief description of the drawings]

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

FIG. 2 is a system diagram showing a second embodiment of a ventilation and air conditioning equipment for a central control room of a nuclear power plant according to the present invention.

FIG. 3 is a system diagram showing a third embodiment of a ventilation and air conditioning equipment for a central control room of a nuclear power plant according to the present invention.

FIG. 4 is a system diagram showing a fourth embodiment of a ventilation and air conditioning equipment for a central control room of a nuclear power plant according to the present invention.

FIG. 5 is a system diagram showing a conventional ventilation and air conditioning equipment for a central control room of a nuclear power plant.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Central control room, 2 ... Air supply fan, 3 ... Air supply casing, 4 ... Air supply duct, 5 ... Recirculation duct, 6 ... Small outside air intake duct, 7 ... Small outside air intake damper, 8 ... Small amount of outside air intake, 9 ... Recirculation fan, 10 ... Recirculation filter, 11
… Outside air intake damper, 12… Outside air intake, 13… Outside air intake duct, 14… Exhaust fan, 15… Exhaust fan outlet damper,
16 ... Exhaust duct, 17 ... Exhaust port.

Claims (5)

[Claims] 1. An air supply duct in which an air supply fan and an air supply casing for supplying air to a main control room are sequentially connected in series, and a recirculation duct connected between a suction side of the air supply fan and the main control room. A small outside air intake duct and an outside air intake duct that are branched from between the recirculation duct and the suction side of the air supply fan and are connected in parallel to the duct; and Central control of a nuclear power plant comprising: a recirculation fan and a recirculation filter bypass-connected to the circulation duct; and an exhaust duct branched and connected between the recirculation fan and the recirculation filter. Ventilation and air conditioning equipment for rooms. 2. An air supply duct in which an air supply fan and an air supply casing for supplying air to a main control room are sequentially connected in series, and a recirculation duct connected between a suction side of the air supply fan and the main control room. And an outside air intake duct branched and connected between the recirculation duct and the suction side of the air supply fan, and a recirculation branched from the recirculation duct and bypass-connected to the suction side of the air supply fan. A fan and a recirculation filter, a small outside air intake duct branched and connected between the recirculation duct and the suction side of the recirculation fan, and between the recirculation fan and the recirculation filter. A ventilating and air-conditioning system for a central control room of a nuclear power plant, comprising an exhaust duct that is branched and connected. 3. An air supply duct in which an air supply fan and an air supply casing for supplying air to a main control room are sequentially connected in series, and a recirculation duct connected between a suction side of the air supply fan and the main control room. An outside air intake duct branched and connected between the recirculation duct and the suction side of the air supply fan; and an exhaust duct branched and connected between the air supply fan and the air supply casing. And a recirculation fan and a recirculation filter branched from the recirculation duct and bypass-connected to the suction side of the air supply fan, and a branch and a connection between the suction side of the recirculation fan and the recirculation duct. A ventilation and air-conditioning system for a central control room of a nuclear power plant, which is equipped with a duct for introducing a small amount of outside air. 4. An air supply duct in which an air supply fan and an air supply casing for supplying air to a main control room are sequentially connected in series, and a recirculation duct connected between a suction side of the air supply fan and the main control room. An exhaust duct branched and connected between the air supply fan and the air supply casing; a recirculation fan and a recirculation filter branched from the recirculation duct and bypass-connected to the recirculation duct; Central control of a nuclear power plant comprising an outside air intake duct and an outside air small amount intake duct connected in parallel to a duct branched from between a circulation duct and a suction side of the recirculation fan. Ventilation and air conditioning equipment for rooms. 5. A motor driving damper is provided in each of the small amount of outside air intake duct, the outside air intake duct, and the exhaust duct.
Ventilation and air conditioning equipment for the central control room described.