JPS61211650A - Ventilating and air-conditioning unit in atomic power plant - Google Patents

Abstract

PURPOSE:To make it possible to maintain soundness of a ventilating and air- conditioning system by providing means for removing snow adhering to a bird screen. CONSTITUTION:The outside air is taken into a building 1 through a lower 2 mounted in an outside air intake port 1a. On the front surface of the lower 2 is extended a metal screen having the length of one side of 10-15mm and the diameter of wire of approximately 1.5-2.3phimm, for example. Around this bird screen is wound electric heating wire 21 as means for removing snow adhering to the screen 20. By supplying power to the electric heating wire 21, snow adhering to the bird screen 20 is molten and falls down as molten snow water and is removed. For this reason, it is possible to effectively prevent such state from occurring that snow adheres to the bird screen 20 and an air flowpath is narrowed, thus resulting incapability of taking in a required quantity of air necessary for the ventilation of the building.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a ventilation air conditioning system that controls temperature and humidity inside a nuclear power plant building and maintains cleanliness. The present invention relates to a ventilation air conditioning system in a nuclear power plant that can prevent snow from adhering to a screen and reducing the effective frontage area of an outside air intake.

(Technical Background of the Invention) Ventilation and air conditioning systems in nuclear power plants provide an environment necessary for the normal operation of each equipment in the plant, and also provide appropriate environmental conditions for operators and workers (indoor temperature, humidity,
cleanliness, ventilation flow, etc.).

Figures 4 to 6 show this type of conventional ventilation air conditioning system.
- Bar 2 is installed, air supply 5111! Outside air is taken into l12f3 and rainwater is prevented from entering the building 1.

Inside the supply air processing device 13, a bug-type filter 4 for removing foreign substances such as dust and particulate salt from the outside air, and a heating coil 5 and a cooling coil 6 for controlling the temperature of the outside air are installed, respectively. After being processed by the supply air processing device 3, the outside air passes through the supply air duct 7 having a damper 7a, and is transferred to three 50% capacity units (one of which is a spare) or two 100% capacity units (including two units). Air blowers 8 (one is a spare) are used to supply air to each air-conditioned area 11!!9 in spaces with high radiation levels (so-called contaminated areas) or spaces where radioactive materials are not present (so-called clean areas). ing.

By the way, in the case of air conditioning for contaminated areas, the purpose is to prevent radioactive materials from staying in the air conditioned space 9, and therefore, as shown in FIG. The bag type filter 10a and the high performance particle filter 10
A one-single system is adopted in which the air is discharged outdoors from an exhaust pipe 13 through an exhaust duct 11 equipped with an exhaust treatment device 10 having an exhaust fan 12 and an exhaust pipe 13. The exhaust treatment device 10 and the exhaust fan 12, like the blower 118, have a 50% lifting capacity (
One of these is a spare) or two 100% capacity M units (one of which is a spare) are configured.

On the other hand, in the case of air conditioning for clean areas, the accumulation of radioactive materials is not a problem, so a part of the air that has been heat exchanged in the air conditioned space 9 is returned to the supply air processing device 3, and the remaining air is A return duct system is used to exhaust the air.

[Problems with background technology]

In the conventional ventilation air conditioner for a nuclear power plant having the above configuration, foreign objects such as birds,
In order to prevent the intrusion of bird feathers, etc., the length of the − side is 10.
It is customary to arrange a wire mesh called a bird screen with a wire diameter of about 1.5 to 2.3 φm.

However, if a nuclear power plant is constructed in an area with a heavy rainfall of 4 m, snow may adhere to the bird screen or the blades of the louver 2 and freeze, narrowing the air flow path. Therefore, there is a risk that it will not be possible to take in the required amount of air necessary for building ventilation.

On the other hand, in the case of powder snow with a low moisture content, the snow passes through the bird screen and the louvers 2 and enters the air supply treatment system @ 3 along with the outside air, and is deposited and collected on the bag-type filter 4, especially at the top. If there are many openings, the bug type filter 4 will become clogged in a very short period of time, and there is a risk that the health of the ventilation air conditioning system cannot be maintained.

[Purpose of the invention]

The present invention was made in consideration of these points, and snow adheres to the bird screen placed in front of the outside air intake, narrowing the air flow path and making it difficult to take in the required air layer necessary for building ventilation. The purpose of the present invention is to provide a ventilation air conditioning system in a nuclear power plant that can effectively prevent a situation in which nuclear power plants become inoperable.

[Summary of the invention]

The present invention is characterized in that the bird screen is provided with a snow removing means for removing snow adhering to the bird screen, so that even if snow adheres to the bird screen, it can be removed. Embodiment] An embodiment of the present invention will be described below with reference to FIG. Note that the present invention has a feature only in the structure of the outside air intake port, and the other parts are completely the same as the conventional structure, so only this feature will be illustrated and explained below.

In FIG. 1, the symbol @1 is a building, and 2 is a louver attached to an outside air intake port 1a provided in this building 1, and outside air is taken into the building 1 through this louver 2.

The front side of the louver 2 is made of gold 11i with a length of 10 to 15 mm and a wire diameter of 1.5 to 2.3φ, for example, to prevent foreign objects such as birds and bird feathers from entering. A bird screen 20 is installed.

The bird screen 20 is provided with a numbered heating wire 21 wound around the bird screen 20 as a snow removing means for removing snow adhering to the bird screen 20 by melting and removing the snow.

Like this, this electric heat! ! By energizing the bird screen 21, the snow adhering to the bird screen 20 melts and becomes melted snow water that falls and is removed. Therefore, it is possible to effectively prevent a situation in which the air flow path becomes narrow due to adhesion to the bird screen 20, and the required amount of air necessary for ventilation of the building cannot be taken in.

Moreover, since the heating wire 21 can be attached even after the bird screen 20 is installed, it can also be applied to existing equipment. In addition, electric heat! ! 21, the bird screen 20 itself may be used as a heater tube or hot water pipe to melt and remove snow.

FIG. 2 does not show another embodiment of the present invention, in which snow deposited on the bird screen 20 can be removed by mechanical means.

In other words, the louver 2 attached to the outside air intake port 1a of building N1
A bird screen 20 is disposed on the front side of the bird screen 20, and a vibrator 22 that vibrates the bird screen 20 is provided at the upper end of the bird screen 20.

In this way, by operating the forceps 1122 in an open or continuous manner, vibrations are applied to the bird screen 20, and the snow adhering to the bird screen 20 can be dropped and removed by this vibration.

FIG. 3 shows still another embodiment of the present invention, in which snow adhering to the bird screen 20 is brushed off with a brush.

That is, on the front side of the bird screen 20, a brush 23 whose tip is in contact with the bird screen 20 extends in the vertical direction, and at its upper and lower ends, brushes 23 arranged horizontally at the upper and lower parts of the bird screen 20 are provided. A drive device 25 that moves on rails 24 is arranged. This allows the brush 23 to reciprocate laterally on the front side of the bird screen 20.

By reciprocating the brush 23 in this manner, snow adhering to the bird screen 20 can be brushed off by the brush 23.

(Effects of the Invention) As explained above, in the present invention, the bird screen is provided with a snow removal means for removing snow adhering to the bird screen, so that the snow adhering to the bird screen narrows the air flow path. It is possible to effectively prevent a situation where the required amount of air necessary for building ventilation cannot be taken in, and the health of the ventilation air conditioning system can be maintained.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of the present invention, FIG. 2 is a sectional view showing another embodiment of the invention, FIG. 3 is a configuration diagram showing still another embodiment of the invention, and FIG. 5 is a system diagram showing a conventional ventilation air conditioner, FIG. 5 is a perspective view of a nuclear power plant showing the louver mounting position, and FIG. 6 is an enlarged sectional view taken along the line Ml-Vl in FIG. 5. 1... Building, 1a... Outside air intake, 2... Louver, 20... Bird screen, 21... Heating wire, 2
2... Heater, 23... Brush, 25... Drive i
t.

Claims (1)

[Claims] 1. Outside air is taken in through an outside air intake port with a bird screen arranged on the front, and this outside air is guided to a filter to remove foreign matter from the outside air, and the temperature is controlled by a temperature control means. What is claimed is: 1. A ventilation air conditioning system for a nuclear power plant that supplies air to an air-conditioned space using a bird screen, wherein the bird screen is provided with snow removal means for removing snow adhering to the bird screen. 2. The ventilation air conditioning system for a nuclear power plant according to claim 1, characterized in that the snow removing means is a heating wire for melting accumulated snow, and the heating wire is wound around a bird screen. 3. Claim 1, characterized in that a vibrator that vibrates the bird screen is used as the snow removal means.
Ventilation and air conditioning equipment in nuclear power plants as described in Section 1. 4. The ventilation air conditioning system for a nuclear power plant as set forth in claim 1, wherein a brush that reciprocates on the front side of the bird screen is used as the snow removal means.