JPS61295446A - Ventilating and air-conditioning device in atomic power plant - Google Patents

Abstract

PURPOSE:To prevent clogging of a filter with snow surely by a method wherein a louver, equipped at an atmosphere intake port, is constituted of an outside louver and an inside louver while the opening positions of both of the louvers are set to as to be different mutually in order to prevent invasion of snow from the atmosphere intake port. CONSTITUTION:The louver 2 is constituted of a double structure consisting of the outside louver 2a and the inside louver 2b while the opening positions of the outside louver 2a and the inside louver 2b are set so as to be different mutually. The flow of atmosphere in the part of the louver 2 is choked at first by the two neighboring sheets of vanes 21 of the outside louver 2a, thereafter, collides against the vanes 22 of the inside louver 2b and the speed thereof is reduced. Accordingly, snow, going to invade through the louver together with atmosphere, stalls by the reduction of the speed thereof and is separated and removed from the atmosphere, then, is adhered to the surfaces of the vanes 21, 22. The snow adhered to respective vanes 21, 22, drops from respective vanes 21, 22, arranged vertically, under its own weight when the amount of snow has become more than a given amount, then, is molten by a snow melting heater 20 and, thereafter, is discharged to the outside of 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 in each v and maintains cleanliness in a nuclear power plant, and particularly relates to a ventilation air conditioning system that controls temperature and humidity inside each v in a nuclear power plant and maintains cleanliness. The present invention relates to a ventilation air conditioning system in a nuclear power plant that can effectively prevent such problems.

[Technical day before invention]

The ventilation air conditioning system in a nuclear power plant maintains the environment necessary for the regular operation of each key of the brand, and also maintains the appropriate environmental conditions (indoor temperature, , humidity, cleanliness, ventilation flow, etc.).

15 to 17 show this type of conventional ventilation air conditioner. A louver 2 is attached to the outside air intake port 1a provided in the building 1, and the outside air is taken into the supply air processing device 3. , prevents rainwater from entering the 1lfll.

Inside the supply air processing device 3, 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 this air supply processing device 3, the outside air passes through an air supply duct 7 having a gunpa 7a,
0% capacity 3 units (one of which is a spare) or 100%00%
Air blowers 8 with a capacity of 21 units are used to blow air into each air-conditioned space 9, which is a space with a high radiation level (a so-called contaminated area) or a space where radioactive materials are not present (a so-called clean area).

By the way) In the case of air conditioning for the dyeing area, the purpose is to prevent radioactive materials from stagnation in the air conditioned space 9, so the air conditioning is carried out from the air supply duct 7 as shown in The same volume of air as the air supplied to the space 9 is sent through an exhaust duct 11 equipped with an IA air treatment device 10 having a bag-type filter 10a and a high-performance particle filter 10b. exhaust rf1
The system uses a one-time system that discharges water from No. 13 to the outside.

The exhaust treatment bag 21210 and the blower 12 are equipped with three 50% capacity units (one of which is a spare) or 100% capacity, in order to ensure the safety, reliability, and redundancy of the plant, similar to the blower F [I8]. 21 units are spare).

On the other hand, in the case of air conditioning for a clean area, 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 is returned to the supply air processing device 3, and the remaining A return duct system is used to exhaust air.

CI management daily technical problems] In the ventilation air conditioning system in the conventional nuclear power plant 1~ with the above configuration, there is a foreign object (
In order to prevent the intrusion of birds (crows, crow feathers, etc.), it is customary to arrange a wire mesh called a bird screen with a side length of 10 to 15M and a wire system of 1.5 to 2.3φM.

However, when Nuclear Power Buran 1~ is constructed in an area with heavy snowfall R, snow adheres to the bird screen or the blades of the louver 2 and freezes, narrowing the air flow path in the case of heavy snow with a high moisture content. Required air m required for fitting and building ventilation
There is a possibility that it will not be possible to import.

On the other hand, in the case of powder snow with a low moisture content, the snow passes through the bird screen and the louver 2 and enters the air supply processing device 3 along with the outside air. However, if there are many such cases, the bug type filter 4 may become clogged in a very short period of time, and the health of the ventilation air conditioning system may not be maintained.

(Purpose of the Invention) The present invention has been made in consideration of the above points, and thus provides ventilation in a nuclear power plant that effectively prevents snow from entering through the outside air intake and reliably prevents filter clogging due to snow. The purpose is to provide air conditioning equipment.

[Summary of the invention]

The present invention introduces the outside air taken in from the outside air intake [1] having a louver to a filter to remove foreign matter in the outside air, and also passes the outside air after foreign matter removal through a lagoon to control the temperature and send it to an air-conditioned space. This is a ventilation air conditioner installed in a nuclear power plant 1 that is equipped with a ventilating air conditioner, in which the louver installed in the outside air intake [l] is composed of an outer louver and an inner louver, each having a required arrangement of openings, and The louver is characterized in that the positions are made to be different from each other, so that when the outside air passes through the louver, snow that tries to enter together with the outside air can be surely caught and removed by either the inside or outside louver.

(Embodiments of the Invention) A first embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

In Fig. 1 and Fig. 2, d3 and numeral 1 refer to outside air intake port 1.
a, and the outside air intake port 1 of this building 1
In a, as shown in FIGS. 1 to 4, a louver 2 for removing snow from outside air and introducing only outside air into the supply air processing device 3 is shown at V=%, and the lower end of the louver 2 is Part 1
A snow melting heater 20 is arranged as shown in the figure.

Inside the supply air processing device 3, a bug-type filter 4 for removing foreign matter 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. The outside air after being processed by the supply air processing device 3 passes through an air supply duct 7 having a damper (not shown), and is blown by a blower 8 to each air-conditioned space (not shown) in a contaminated area or a clean area. It has become so.

As shown in FIGS. 3 and 4, the louver 2 has a double structure consisting of an outer louver 2a and an inner louver 2b, and the opening position of the outer louver 2a and the opening position of the inner louver 2b are different from each other. are set to be different from each other.

In other words, the outer louver 2a 110 is a plurality of vertically elongated blades 2 in a V-groove shape, with both sides opening toward the inner louver 2b in a shape that opens toward the inner louver 2b.
1 are arranged at required intervals in the horizontal direction, and the one-way side louver 2b has a plurality of vertically long blades 22 each having a lower cross-sectional shape.
are arranged horizontally at required intervals. Each blade 22 of the inner louver 2b is located between two adjacent blades 21 of the outer louver 2a, and has a staggered shape as a whole.

Each of these blades 21 and 22 is, for example, JISI-1410
It is made of an aluminum alloy extruded shape with a thickness of 1.6M or more as defined in 0.0, and is designed to provide sufficient rust prevention and strength.

Next, the operation of this embodiment will be explained.

When the supply air processing device 3 is started at 7 o'clock in the morning, the outside air flows through the louver 2.
However, at this time, snow also tries to enter from the louver 2 along with the outside air.

V, the flow of outside air in the louver 2 part first flows through the two adjacent blades 2 of the outer louver 2a as shown by the arrows in FIG.
1, and then comes into contact with the blades 22 of the inner louver 2b and is temporarily decelerated. Therefore, the snow that tries to enter with the outside air stalls due to this deceleration and is separated and removed from the outside air, and also adheres to the surface of each blade 21, 22 and is removed. The amount of snow that has landed on each blade 21, 22 will fall under its own weight from each vertically arranged blade 21, 22 when the height of the snow exceeds a certain level. The fallen snow is melted by the snow melting heater 20, and the melted snow is taken outside.

The present applicant installed the louver 2 according to the above embodiment in conventional equipment, and conducted a pressure loss M-seri at the outside air intake port 1a, and obtained the following results.

(Example of calculation) (1) Conditions in Figure 3: Blade width a: Opening width b = 1:1 Blade width C: Opening width d = 1 + 1 Effective area of blade 22 = Mounting opening area・Feather 22
The effective opening area of the blade 21−the effective opening area of the blade 21・θ=60°.

(2) Setting conditions (using conventional 2Q values) - Louver installation opening area WxH = 4.1x4 Cm] Total pressure loss =,
6.0 (mA<1) ・Blower wind pressure -250000 (general 3/h) Static pressure -210 (mA (1') *3) Calculation formula The total pressure Kl loss ΔPt is determined by the following formula.

However, ζ: Local loss coefficient (this field is taken from the Air Conditioning and Sanitary Engineering Handbook ■10th edition) V: Wind speed (m/s) Q: 9.8 γ: Air specific gravity 11i1=1.2 (4) Outer louver 2a The total pressure loss Δpta of the outer louver 2a shown in FIG. 5 is as described above. 3600 = 8.468 = 8.47 m/s, so by substituting this into equation (1) above, total pressure loss Δpta = 0.527 (# ^ζ +) ・--
−−・ (2>).

(5) Total pressure loss Δptb of the inner louver 2b Fig. 6 (a)
The inner louver 2b shown in FIG. 6 is considered to be divided into two parts as in the model shown in FIG. 6(b). As mentioned above, each regulation of the inner louver 2b is ζ-1,25 (at H/W 0.25) γ-1,2 - Wind speed of blade 21 = 8.47 a/s, so these are as follows. Substituting into equation (1), the total pressure loss Δptb is X2=10. 98 (familiar〇〕) ... (3).

(6) Total pressure loss ΔPt as louver 2 Total pressure loss Δpt
From equations (2) and (3) above, ΔPt=Δpta+ΔPtb=0.527+10.98
=11.507 (s+Ag) (4).

(7) Evaluation The above results are within the range where the static pressure loss is only slightly greater than the conventional louver and can be used.

In this way, the louver 2 is connected to the outer louver 2a and the inner louver 2.
Since both blades 21 and 22 are arranged in a staggered manner as a whole, snow that tries to enter along with the outside air can be almost completely removed by the louver 2 portion. Further, as is clear from the above-mentioned example, even if the louver 2 has a double structure, the increase in pressure loss is small, and it can be used satisfactorily for practical purposes.

7 to 10 show a second embodiment of the present invention, in which the louver 2 is composed of an outer louver 32a, an inner louver 32b, etc.

That is, as shown in FIGS. 7 to 10, the outer louver 32a has a plurality of horizontally long blades 33 in the shape of a trapezoid whose upper and lower surfaces open toward the inner louver 32b.
The one-way side louver 32b is constructed by disposing a plurality of horizontally long strip-like blades 34 at required intervals in the vertical direction. Each blade 34 of the inner louver 32b is connected to the outer louver 32a.
It is arranged between two adjacent blades 33, and has a staggered shape as a whole.

Also, unlike the louver 2 of the first embodiment, this louver 2 does not have a snow melting heater H4 at its lower end as shown in FIG.
An opening 35 is provided for discharging falling snow. In other respects, the configuration is the same as that of the first embodiment.

Even with this configuration, the same effects as in the first embodiment can be expected.

11 and 12 show a third embodiment of the present invention, in which an inner louver/12b is used in place of the inner louver 2b of the first embodiment, and the inner louver 4.2b and the outer louver 2a The louver 2 is made up of the following.

However, the inner louver 42b is
As shown in Fig. 2, it is constructed by arranging a plurality of vertically long groove-shaped blades 43 at required intervals in the horizontal direction, with both sides opening toward the outer louver 2a in a shape that widens toward the outer louver 2a.
are arranged between two adjacent blades 21 of the outer louver 2a, and form a staggered shape as a whole. Further, at both ends of the opening of each blade 43 of the inner louver 42b, a return portion 43a bent in a hook shape toward the inner side of the groove is provided.

In other respects, the configuration is the same as that of the first embodiment.

In this way, the inner louver 42 is
b, and a return portion 43 is provided at both ends of the opening of each blade 43.
a is provided, the number of times that the outside air comes into contact with each blade 21.43 increases as shown by the arrow in FIG. 12, and the effect of removing ghosts can be improved.

FIGS. 13 and 14 show a fourth embodiment of the present invention, in which an inner louver 52b is used in place of the inner louver 32b in the second embodiment.

That is, the inner louver 52b is
As shown in the figure, a plurality of groove-shaped horizontally long blades 53 are arranged at required intervals in the vertical direction, and each blade 5
3 is Rn between 62 adjacent blades 33 of the outer louver 32a, and has a staggered shape as a whole. In other respects, the configuration is the same as that of the second embodiment.

In this way, the inner louver 52 is
By configuring b@, the number of times that the outside air comes into contact with each blade 33.53 increases as shown by the arrow in Fig. 14.
Therefore, more snow can be removed.

〔Effect of the invention〕

As explained above, in the present invention, the louver has a double M4 structure consisting of an outer louver and an inner louver each having a desired arrangement of openings, and the opening positions of both louvers are made to be different from each other. While the outside air curves and flows inside the louver, snow in the outside air adheres to the louver, stalls, falls, and is removed from the outside air. Therefore, it is possible to effectively prevent snow from adhering to the filter and clogging the filter, and it is possible to improve the reliability of the ventilation air conditioning system.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing a first embodiment of the present invention.
Fig. 32 is a perspective view of the louver portion in Fig. 1 viewed from the outdoor side - a view corresponding to Fig. 1 showing the irises embodiment, Fig. 8 is a similar view corresponding to Fig. 2, and Fig. 9 is a view corresponding to Fig. 8. IX-ray enlarged sectional view, 1st
Figure 0 is an enlarged view of the X section in Figure 9, Figure 11 is a view equivalent to Figure 3 showing the third embodiment of the present invention, and Figure 12 is an enlarged view of the X section in Figure 11.
FIG. 13 is a diagram corresponding to FIG. 8 showing the fourth embodiment of the present invention. FIG. 14 is an enlarged diagram of the XIV section of FIG.
Figure 5 is a system diagram showing the conventional ventilation air conditioning system a, Figure 16 is a perspective view of a polynuclear nuclear power plant showing the louver installation position, and Figure 1
FIG. 7 is an enlarged sectional view taken along the x vi -x ■ line in FIG. 16. DESCRIPTION OF SYMBOLS 1... Building, 1a... Outside air installation port, 2... Louver, 2a, 32a=--Outside louver, 2b, 32b. 42b, 52b...Inner louver, 3...Air supply processing equipment, 4...Bugquib filter, 5...Heating coil, 6...Cooling coil, 8...Blower, 9... ...Air conditioned space, 21°22.33.34.43.53...Blade, 43a...Hedge part. Applicant's agent Ino ■2 Sei 10a Figure 15 Figure 16 Figure 17

Claims (1)

[Claims] 1. Outside air taken in from an outside air intake port having a louver is guided to a filter to remove foreign matter from the outside air, and the outside air after foreign matter is removed is passed through a temperature controller to adjust the temperature and create an air-conditioned space. In the ventilation air conditioner for a nuclear power plant, the louver is composed of an outer louver and an inner louver, each having a desired arrangement of openings, and the opening positions of the two louvers are different from each other. Ventilation and air conditioning equipment in nuclear power plants. 2. The outer louver is configured by arranging a plurality of groove-shaped blades at required intervals with both sides opening toward the inner louver, and each of the plurality of blades constituting the inner louver is The ventilation air conditioner for a nuclear power plant according to claim 1, wherein the ventilation air conditioner is located between two adjacent blades of the outer louver. 3. The ventilation air conditioner for a nuclear power plant as set forth in claim 2, wherein each of the blades constituting the inner louver is formed in a groove shape with both sides opening toward the outer louver in a manner that expands toward the outer louver. . 4. The ventilation air conditioner for a nuclear power plant according to claim 3, wherein each of the blades constituting the inner louver is provided with a return portion bent in a hook shape on the inside of the groove at both ends of the opening.