JPS62102044A - Snow melting device for outdoor air treatment device - Google Patents

Abstract

PURPOSE:To catch and melt powder snow which has intruded from a louvre for outdoor air intaking and forcibly recovering melted snow to drain and prevent the attachment of powder snow to a supply air filter by installing a plurality of metal plates which are provided with a slit shaped opening and spraying and dropping tap water or warm water among the metal plates. CONSTITUTION:On the down-stream side of an outdoor air intake louvre 1 two metal plates 6 with a distance between them for catching powder snow intruding into a room are provided and tap water is made to flow on the metal plates 6 by a spray 7. Outdoor air containing powder snow collides with the outer face of the slit opening 13 in the first metal plate 6 and falls onto the inner face of slit openings 13 right below the outer face. Part of the powder snow passes between the metal plates 6 and it is caught on the inner face of the slit opening 13 of the second metal plate 6. On the other hand between the metal plates 6 tap water falls down as it forcibly melts the powder snow attached to the inner faces of the slit opening 13. Further a drain pan 8 is provided under the metal plates 6, and melted snow is led along with tap water to a side furrow 3 of a building and it is recovered to a water discharge system in the building by a drain water discharge pipe 4.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to an outdoor air processing device for ventilation and air conditioning systems for nuclear power generation facilities, and is particularly suitable for use in outdoor air processing devices for nuclear power generation facilities installed in areas with heavy snowfall. Regarding snow melting equipment.

[Background of the invention]

Examples of snow melting and snow intrusion prevention devices in the outside air processing equipment of nuclear power generation facilities installed in areas with heavy snowfall include:
As described in Japanese Unexamined Patent Publication No. 59-164838, it has been proposed that air is supplied from the bottom and a cover is attached to allow natural fall during thunderstorms, etc., but the appearance of the outside wall of the building is poor, and , there are problems such as it is not easy to support the cover etc.

[Purpose of the invention]

The object of the present invention is to collect powder snow that enters from outside air intake louvers using a board with slit-like openings, melt the collected powder snow with running water, and efficiently collect it into a floor drain. To provide an outside air processing device that can prevent snow from entering the air supply filter of the outside air processing device.

[Summary of the invention]

The present invention provides an outside air processing device for the ventilation and air conditioning system of nuclear power generation facilities installed in areas with heavy snowfall, in which powder snow enters through the outside air intake louvers during winter snowfall, is collected by the air supply filter, and is filtered out. As a result, multiple metal plates with slit-shaped openings are installed to collect this powdered snow before it reaches the air supply filter and collect it in the drain. The outside air intake louver is installed between the air supply filters and allows water to flow down into the gaps between the plurality of metal plates.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1, 3, and 4. FIG. 2 shows an outside air treatment device used in conventional nuclear power generation equipment. In order to prevent the spread of contamination within the nuclear power generation facility, the ventilation and air conditioning equipment takes in a large amount of outside air from outside the five buildings, ventilates the inside of the building, and discharges the exhaust gas into the atmosphere through an exhaust stack. . Also,
It operates continuously throughout the year, day and night, to prevent the spread of pollution and remove the heat generation load during power generation. Therefore, it is necessary to drive regardless of weather conditions. During snowfall, Figure 2 shows that the wind speed passing through the first part of the outside air intake looper is 2 m/s to 5 m.
/ s, the powder snow passes through the outside air intake looper 1, gets on the drifting outside air, and is collected by the ventilation filter 2 provided to remove dust from the outside air. The collected powder snow freezes on the ventilation filter 2, damaging the ventilation filter 2, and at the same time, the supply air filter becomes clogged, which creates resistance and reduces the intake air volume. ing. The present invention provides the first
As shown in the figure, two metal plates 6 are installed at intervals on the downstream side of the outside air intake looper 1 to collect powder snow that has entered, and tap water is sprayed onto the metal plates 6 with a spray 7. I try to let it flow. Further, a drain pan 8 is installed at the lower part of the metal plate 6, and the melted snow water is guided to the side gutter 3 of the building together with tap water, and is collected by the drain pipe 4 into the building's own drainage system. FIG. 3 is a diagram showing the detailed structure of the metal plate 6 and the tap water spray 7.

The spray 7 is connected to the Yatsuda piping 9 and the spray nozzle 10.
It is made up of. The spray nozzles 10 are arranged at about 301 pitches so that the tap water falls almost uniformly between the metal plates 6. The vertical height of the metal plate 6 is 3
If the distance exceeds 3 m, a sprayer with the same structure as the spray 7 shown in Fig. 3 is installed every 3 m to prevent the falling water from freezing. The metal plate 6 has a slit-shaped opening 13 as shown in FIG. The slits 13 are formed by using a single metal plate, making cuts at regular intervals, and pressing the cuts. The slit openings 13 are arranged at intervals of 10 mm in the vertical direction and 200 m in the horizontal direction, and the interval between the openings is approximately 5 mm.

FIG. 4 is a diagram illustrating the principle of collecting powder snow and melting snow. The outside air containing the powder snow 12 collides with the outer surface of the slit opening 13 of the first metal plate 6, and the slit opening 13 directly below it collides with the outer surface of the slit opening 13 of the first metal plate 6.
falls on the inner surface of A portion passes between the metal plates 6 and is collected on the inner surface of the slit opening 13 of the second metal plate 6.

On the other hand, tap water 11 is dropped between the metal plates 6, and this tap water falls along the inner surface of the slit opening 13. At this time, the powdered snow 12 adhering to the inner surface of the slit opening 13 is forcibly melted and dropped. The fallen tap water 12 and melted powder snow can be continuously collected by a drain pan 8 installed at the bottom.

In a snowy area where a nuclear power plant is located, the height is 3 m and the width is 5.
In an experiment using a snow melting device of 5 rn'
We were able to confirm that by continuously running 20/h of tap water, the powder snow melted almost completely and flowed out as drain.

In addition, under the condition that the surface wind speed of the snow melting device was 2 m/s, two pieces of gold “
By simply using the shoulder board, powder snow was not allowed to enter the air supply filter. When this surface wind speed exceeds 2 m/s, some powder snow and tap water were observed to be scattered downstream, but by adding one metal plate to make it three, We have obtained the prospect that scattering can be almost completely prevented.

According to one example of the present invention, it was confirmed that the following effects were achieved.

■It is now possible to almost completely remove the powder snow that has passed through the outside air intake louver, eliminating the powder snow adhering to the air supply filter.

■When used without running tap water, this snow melting device can almost completely remove raindrops that enter through the outside air intake looper during rainstorms.

Also, since the snow melting device is an open type.

Since the slit opening is relatively large, it does not get clogged with dirt and is almost maintenance-free.

〔Effect of the invention〕

According to the present invention, a plurality of metal plates provided with slit-shaped openings are installed, and tap water or hot water is sprayed between the plates to collect and melt powder snow that has entered through the outside air intake louver. Since the drain can be forcibly recovered, it is possible to almost completely prevent powder snow from adhering to the air supply filter.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a schematic structure of an embodiment of the present invention, and FIG.
The figure is an explanatory diagram of the conventional structure and problems. FIG. 3 is a detailed explanation of the present invention and an explanatory diagram of the principle of the present invention. 6...Metal plate, 7...Spray, 8...Drain pan, 9...Pezder piping, 10...Spray nozzle, 13...Slit opening.

Claims (1)

[Claims] 1. In a ventilation air conditioning system outdoor air processing device consisting of an outdoor air intake louver and a supply air filter of a nuclear power generation facility, a plurality of plates with slit-shaped openings are installed on the upstream side of the supply air filter. , A snow melting device for an outside air processing device, characterized in that water is caused to fall between the plate materials.