JP3761090B2 - Method and apparatus for salt damage test of air filter unit for ventilation - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a salt damage test method and apparatus for a ventilation air filter unit.
[0002]
[Prior art]
In buildings, factories, offices, etc., air filters are used to remove dust floating in the air. Among the air filters, JIS standards have been established for the performance test methods of ventilation air filter units and ventilation electric dust collectors that remove dust using a filter medium (see Non-Patent Document 1, for example).
[0003]
[Non-Patent Document 1]
“JIS B 9908 Ventilation Air Filter Unit / Ventilation Electric Dust Collector Performance Test Method”, Japanese Standards Association [0004]
[Problems to be solved by the invention]
In places close to the sea, salt damage is caused by sea salt particles in the atmosphere. Therefore, for example, in a building constructed on an artificial island at sea, it is conceivable to remove sea salt particles with a ventilation air filter unit (hereinafter referred to as “filter unit”) to prevent salt damage in the building.
[0005]
For the air filter unit for ventilation used near the sea, test equipment is placed near the sea or near the coast to investigate the durability against the natural environment and corrosion, and the air filter is actually installed for about six months to one year. Some tests may be used.
[0006]
However, in such a test method, the place where the test can be performed is limited, the time required for the test is long, and the result depends on the natural environment.
[0007]
In addition, even when the sea salt particles are captured by the filter unit, they may melt during the subsequent rain and ooze out from the filter unit. Because of this unique phenomenon of deliquescence, general test methods for dust cannot be applied to sea salt particles as they are.
[0008]
In view of the above, an object of the present invention is to provide a salt damage test method and apparatus for an air filter unit for ventilation that can perform an objective salt damage test in an arbitrary place in a short time.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides the following salt damage test method for a ventilation air filter unit.
[0010]
A salt damage test method for an air filter includes: a first step of fixing the filter unit so that the filter unit crosses the inside of the duct; and while blowing air from one side of the duct to the other side with respect to the filter unit, A second step of spraying particulates containing salt and pigment on one side of the duct with respect to the filter unit; a third step of drying the filter unit; and a filter unit from one side of the duct to the other. A fourth step of spraying fine particles of water only on one side of the duct with respect to the filter unit while blowing air to the side .
[0011]
In the above method, by spraying fine particles containing salt and pigment from one side of the duct with respect to the filter unit, the fine particles containing salt and pigment move to the other side of the duct. A filter unit arranged to traverse the duct captures the moving particulates depending on its performance.
[0012]
For the evaluation against salt damage, for example, the collection efficiency, which is the efficiency with which the filter unit captures fine particles containing salt and pigment , is used. Collection efficiency: η (%) measures the salinity concentration ρ ₁ on the upstream side of the filter unit and the salinity concentration ρ ₂ on the downstream side,
η = (1−ρ ₂ / ρ ₁ ) × 100 (1)
By asking.
[0013]
According to the above method, by appropriately setting test conditions such as the spray amount and concentration of fine particles containing salt and pigment , spray time, etc., reproducibility can be achieved at any place without being influenced by the natural environment. A highly objective test can be performed in a short time in an accelerated manner.
[0014]
After spraying the particles containing the salt component and the dye, spraying fine particles of water only.
[0015]
After microparticles comprising a salt component and the dye is captured on the upstream side of the filter unit, salinity also melted by fine particles of only water containing neither dye reaches the downstream side of the filter unit on the downstream side of the filter unit The pigment appears and the color changes. Therefore, the deliquescence test can be performed by observing the color downstream of the filter unit.
[0018]
Moreover, in order to achieve the said objective, this invention provides the salt damage test apparatus of the following air filter units for ventilation.
[0019]
The ventilation air filter unit performance test apparatus is used in the above-described salt damage test method. A salt damage test apparatus for a ventilation air filter unit is provided with a duct, a unit fixing portion for fixing the filter unit so as to traverse the inside of the duct, and air is blown from one side of the duct to the other side with respect to the unit fixing portion. A blower, a fine spray humidifier that is disposed on one side of the duct with respect to the unit fixing portion and can spray fine particles containing salt and pigment, and spray fine particles of water only; and the fine spray humidifier A liquid amount measuring device for measuring the amount of liquid to be supplied .
[0020]
In the above configuration, when fine particles containing salt and pigment are sprayed from one side of the duct in a state where air is blown from one side of the duct to the other side, the fine particles containing salt and pigment are transferred to the other side of the duct. And move. A filter unit arranged so as to traverse the inside of the duct captures the fine particles according to its performance.
[0021]
For the evaluation against salt damage, for example, the collection efficiency, which is the efficiency with which the filter unit captures fine particles containing salt and pigment , is used. Collection efficiency: η (%) measures the salinity concentration ρ ₁ on the upstream side of the filter unit and the salinity concentration ρ ₂ on the downstream side,
η = (1−ρ ₂ / ρ ₁ ) × 100 (2)
By asking.
[0022]
According to the above configuration, by appropriately setting test conditions such as the spray amount and concentration of fine particles containing salt and pigment, and spray time, reproducibility can be achieved at any place without being influenced by the natural environment. A highly objective test can be performed in a short time in an accelerated manner.
[0023]
Before SL atomization humidifier, and microparticles comprising a salt and a dye, and fine particles of water alone, selectively spraying.
[0024]
After spraying the particles containing the salt component and the dye, salt be sprayed fine particles of water alone which do not contain dyes, it is possible to perform a deliquescence test. That is, fine particles containing salt and pigment are trapped on the upstream side of the filter unit, and then are dissolved by fine particles of water only. When reaching the downstream side of the filter unit, the pigment appears on the downstream side of the filter unit. Change, the deliquescence test can be performed by observing the color downstream of the filter unit.
[0027]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIG.
[0028]
As shown in FIG. 1, a salt damage test apparatus (hereinafter referred to as “salt damage test apparatus”) 10 of an air filter unit for ventilation according to an embodiment of the present invention includes a duct 20 and a fine spray humidifier 30. .
[0029]
The duct 20 is provided with a blower 24 (for example, a sirocco fan) at one end, and sucks air from the opening 22 at the other end of the duct 20 as indicated by an arrow 28. A unit fixing portion 23 for fixing the filter unit 50 is provided at an intermediate position of the duct 20, and the filter unit 50 is fixed in a state of traversing the inside of the duct 20.
[0030]
A sampling unit 40 is provided on the downstream side (blower 24 side) from the filter unit 50. From the sampling unit 40, as indicated by an arrow 48, suction is performed by the intake pump 44, and the suction amount is measured using the flow meter 42.
[0031]
The fine spray humidifier 30 sprays liquid fine particles toward the opening 22 of the duct 20.
[0032]
The fine spray humidifier 30 has, for example, a spray nozzle 30c connected to an air line 30a and a liquid line 30b. The liquid line 30 b sucks liquid from the liquid reservoir 32 as indicated by an arrow 31. As the liquid reservoir 32, a transparent and graduated container (for example, a graduated cylinder) is used so that a change in the liquid level can be easily monitored from the outside. The liquid reservoir 32 is supplied with a liquid from a liquid container 36 using a pump 34 as indicated by arrows 35a and 35b. The amount of liquid in the liquid container 36 is measured by a liquid amount measuring device 38. For example, a digital balance is used as the liquid amount measuring device 38 and the weight of the liquid container 36 is measured.
[0033]
Next, a specific method of a salt damage test performed using the salt damage test apparatus 10, that is, a sea salt particle (fine water droplet) removal test will be described.
[0034]
First, the filter unit 50 is fixed to the unit fixing portion 23. A glass filter paper that has been dried and weighed in advance is attached to the sampling unit 40. A NaCl solution having a predetermined concentration is placed in the liquid container 36, and the liquid volume is measured by a liquid volume measuring device 38.
[0035]
Next, the blower 24 is operated and adjusted so that the inside of the duct 20 has a predetermined air volume. Further, the intake pump 44 is operated, and adjustment is performed so that the suction is performed from the sampling unit 40 at a flow velocity equal to that around the sampling unit 40.
[0036]
Next, the fine spray humidifier 30 and the pump 34 are operated to generate fine particles containing salt, and the fine particles are sucked into the duct 20.
[0037]
After a predetermined time has elapsed, spraying is stopped and the blower 24 and the intake pump 44 are stopped.
[0038]
Then, the liquid volume is measured by the liquid volume measuring device 38, and the NaCl concentration: ρ ₁ upstream from the filter unit 50 is obtained from the weight of the sprayed NaCl and the air volume in the duct 20.
[0039]
Further, the glass filter paper attached to the sampling unit 40 is weighed after drying, and the NaCl concentration downstream of the filter unit 50: ρ ₂ is obtained from the weight of NaCl attached to the glass filter paper and the air volume in the duct 20.
[0040]
The collection efficiency of the filter unit 50: η (%) is
η = (1−ρ ₂ / ρ ₁ ) × 100 (3)
Calculated by
[0041]
Alternatively, the mass _{W F} of NaCl adhering to the filter unit 50, and a mass _{W L} of sprayed NaCl, collecting efficiency: eta (percent)
_{η = W F / W L ×} 100 ··· (4)
You may calculate by.
[0042]
As an example of specific test conditions, 10 wt% NaCl is dissolved in distilled water, and the solution is made into a spray mist having a particle diameter of 10 to 50 μm by the fine spray humidifier 30 and attached to the filter unit 50. The particle diameter of 10 to 50 μm is the same as the sea salt particle (fine water droplet) particle diameter that has not lost moisture in the atmosphere. The filter unit 50 is approximately 700 mm × 700 mm.
[0043]
Next, a specific method of the deliquescence test performed using the salt damage test apparatus 10 will be described.
[0044]
First, similarly to the sea salt particle (fine water droplet) removal test described above, fine particles of NaCl solution having a predetermined concentration are sprayed. At this time, an appropriate coloring matter (for example, red ink) is added to the NaCl solution.
[0045]
Next, the filter unit 50 having NaCl and a dye attached to the upstream side (opening 22 side) is dried under predetermined conditions.
[0046]
Next, using the salt damage test apparatus 10, fine particles are sprayed by the fine spray humidifier 30 while blowing air in the same manner as the sea salt particle (fine water droplet) removal test described above. At this time, fine particles of only water not containing NaCl or pigment are sprayed.
[0047]
When spraying for a predetermined time is completed, it is examined whether or not a dye appears on the downstream side of the filter unit 50. If the pigment appears, it can be easily understood that the salt once trapped by the filter unit 50 is dissolved by distilled water and oozes out downstream.
[0048]
As an example of specific test conditions, 10 wt% NaCl and red ink are dissolved in distilled water, and the solution is made into a spray mist having a particle diameter of 10 to 50 μm by a fine spray humidifier 30. Adhere. The particle diameter of 10 to 50 μm is the same as the sea salt particle (fine water droplet) particle diameter that has not lost moisture in the atmosphere. The filter unit 50 is approximately 700 mm × 700 mm. After the spraying is finished, the filter visually confirms the colored state on the upstream side and the downstream side of the filter, and performs photography.
[0049]
After the spraying is finished, the filter is naturally dried indoors for two days, and then only distilled water is made into a spray mist having a particle diameter of 10 to 50 μm by the fine spray humidifier 30 and attached to the filter unit 50. After the spraying is finished, the filter visually confirms the colored state on the upstream side and the downstream side of the filter, and performs photography.
[0050]
【The invention's effect】
By spraying fine particles containing salt, an objective test with high reproducibility can be performed in a short time at an arbitrary place without being influenced by the natural environment. In addition, after spraying fine particles containing salt and pigment, a deliquescence test can be performed by spraying fine particles of water alone.
[0051]
In addition, this invention is not restricted to the said Example, It is possible to implement in various aspects.
[0052]
For example, the fine spray humidifier 30 may be disposed in the duct 20. The fine spray humidifier 30 may be other than the type using the spray nozzle 30c. In addition, parameters other than the collection efficiency (for example, pressure loss) may be used for performance evaluation of the filter unit 50 against salt damage.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a salt damage test apparatus showing an embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Salt damage test apparatus 20 Duct 23 Unit fixing | fixed part 24 Blower 30 Fine spray humidifier 50 Filter unit

Claims (2)

A first step of securing the filter unit such that the filter unit traverses within the duct;
A second step of spraying particulates including salt and pigment on one side of the duct with respect to the filter unit while blowing air from one side of the duct with respect to the filter unit ;
A third step of drying the filter unit;
And a fourth step of spraying fine particles of water only on one side of the duct with respect to the filter unit while blowing air from one side of the duct to the other side with respect to the filter unit. , Salt damage test method for air filter unit for ventilation. A salt damage test apparatus for a ventilation air filter unit used in the salt damage test method according to claim 1,
Ducts,
A unit fixing part for fixing the filter unit so as to cross the inside of the duct;
A blower that blows air from one side of the duct to the other side with respect to the unit fixing part,
A fine spray humidifier that is arranged on one side of the duct with respect to the unit fixing part, and that can spray fine particles containing salt and pigment, and spray fine particles of water only ;
A salt damage test apparatus for an air filter unit for ventilation, comprising: a liquid amount measuring device for measuring a liquid amount supplied to the fine spray humidifier .

Images