JPH03284319A - Air treating element and water screen-type air treating device having the same - Google Patents

Abstract

PURPOSE:To collect dust and to make malodorous gases absorb by laminating plates having a longitudinal recessed groove on its front and rear in the thickness direction to obtain an air treating element, erecting the recessed groove and arranging a water sprinkler above the upper surface. CONSTITUTION:The plates 12 have a cross section on which continuous mountains and valleys are alternately arranged, and a longitudinal recessed groove 12c is formed on the front and rear. Many plates 12 are laminated in the thickness direction, the grooves of the adjacent plates 12 are crossed with one another at a certain angle, and the bottom of the valley of the groove of one plate is brought into point-contact with the peak of the mountain of the groove of the adjacent plate. The air treating element thus constituted is erected so that the groove is vertically directed, and a cross section having alternate continuous mountains and valleys is formed on the upper surface. A water sprinkler 13 is arranged above the upper surface and a water receiver 14 below the lower surface. Consequently, dust and microbes are collected and malodorous gases are absorbed by the formed water screen.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an air treatment element used for air treatment such as air purification, and a water film type air treatment device having this element.

<Conventional technology and its problems> Air treatment, such as dust collection and purification treatment, gas and odor purification treatment, floating microorganism removal treatment, humidification or dehumidification treatment, etc.
A wide variety of methods are used for industrial or environmental purification purposes.

Among these, the most common type of filter is one that mainly performs dust collection and purification processing, and a method is adopted in which the dust is accumulated and then cleaned and reused. However, this method requires a lot of cleaning work and cannot be used depending on the type of dust, so its range of use is extremely limited.

Another method is the so-called air washer method. This method allows air to pass through water droplets, and is used to collect dust by adsorbing water, as well as microorganisms such as floating bacteria, and gases and odors that have an affinity for water. The size of water droplets also varies, and there is a limit to the collection of dust and bacteria due to the size of the water droplets.After the water droplets are vaporized by the scattering of small water droplets, dust is generated in the air again and the dust collection effect is reduced. Appearance decreases.

In addition, when collecting dust by colliding air with a water film, which is the water curtain method, it is difficult to repeatedly collide the water film many times due to the structure, so water droplets are generated as in the air washer method. Even if there is no such thing, the collection efficiency will not be very high.

In purifying gases and odors, for example, air can be effectively collected by exposing activated carbon to air, but activated carbon has the disadvantage that its lifespan is extremely short.

In addition, when looking at conventional humidifiers, humidification is performed using water droplets such as ultrasonic type or water spray type, but dust and calcium in the moisture are also scattered in the air, causing the so-called white powder phenomenon and causing scale growth. arise. Furthermore, it requires a humidification absorption distance, which is the distance required for water droplets to change into gas, and requires space.

Furthermore, when a humidifier that is conventionally used as a cooling tower filler is used as a humidifier, although it is a mixture of water film and water droplets, white powder and aerosols such as bacteria are generated.

When using a laminated honeycomb element with an effective diameter of less than 8 m as a humidifier, etc., the area for mass transfer (vaporization) is large (which is convenient), but it is difficult to create a water film within the honeycomb for purification and humidification. As a result, water bridges are likely to occur due to the honeycomb structure, and when the water bridges are broken by the air flow inside the honeycomb flutes, water droplets are scattered.Furthermore, dust may stick inside the flutes and the concentration of inorganic substances in the water supply may be reduced. It becomes a concentrated slurry through vaporization.In other words, the through-flow static pressure loss of air increases and the service life is shortened.

In addition, a type in which water permeates through a porous membrane with pores and evaporates is advantageous because water droplets do not scatter, but a decrease in efficiency due to clogging of the pores is unavoidable.

Humidifiers that use a matrix made of metal or synthetic resin fibers are inexpensive, but water droplets are generated due to the rupture of the water film inside the humidifier, making it difficult to remove dust and microorganisms trapped inside the matrix. Clogging results in the formation of white powder. As a result, the service life is short due to an increase in static pressure loss and a decrease in humidification efficiency.

The present invention eliminates the problems of the various air treatment devices described above, eliminates the need for cleaning, eliminates water droplets, and allows installation of multiple stages of devices.
The object of the present invention is to provide an air treatment element that eliminates drawbacks such as short life in conventional dust collection, degassing, deodorization, humidification, and cooling, and a water film type air treatment device having this element.

Means for Solving the Problems> The present invention achieves the above-mentioned objects by: (1) A plate-like body having a cross section in which peaks and valleys are continuous alternately, and in which longitudinal grooves are formed from the front side and the back side by the peaks and valleys. are laminated in the thickness direction, and the longitudinal grooves of the adjacent plate-shaped bodies are alternately stacked at a certain angle to form the longitudinal grooves of one of the mutually adjacent plate-shaped bodies. (2) The plate-like body forming the longitudinal grooves on the front and back sides has a thickness of The air treatment element, which is constructed by stacking the air treatment elements in the horizontal direction, is arranged so that the longitudinal grooves stand up and down, so that the upper surface faces a cross section with alternating peaks and valleys. It is characterized by a water belly type air treatment device with a water tank as a receiver.

<Operation> By sprinkling water from the upper surface side where the peaks and troughs of the laminated plate-like bodies are continuous alternately, a water film spreads evenly within the longitudinal groove from the point contact area, and the water film covers the entire front and back surfaces of the longitudinal groove. Water flows while forming, while the treated air collides with the walls of adjacent longitudinal grooves one after another and crosses over the peaks and valleys of the longitudinal grooves, thereby collecting dust, degassing, deodorizing, humidifying, and cooling. It will be done. Note that in this case, water droplets are not scattered by the air flow due to the surface tension of the water film.

Embodiments Here, the present invention will be described in detail with reference to the drawings. FIG. 1 shows the entire air treatment device 11, which includes a large number of plate-like bodies 1 each having a cross section with alternating peaks and valleys, for example, a wave-shaped cross section.
2 are stacked on top of each other in a layered manner, and a discharge pipe 13 is arranged above the upper surface of this plate-like body 12 to supply water from a discharge port, and sprinkles water flowing down along the corrugated surface of the plate-like body 12. .

Further, below the lower surface of the plate-like body 12, a water tank 14 for receiving water is provided.
is provided. This water tank 14 has an air treatment device 11.
A supply pipe 15 for supplying fresh water to the water tank 15 is connected to the water tank 15 via a valve 16, and the base end side of the discharge pipe 13 is inserted and fixed into water in the water tank 14. Further, a pump 17 is interposed in the middle of the discharge pipe 13 for pumping the water in the water tank 14 to the distal end side of the discharge pipe 13 and supplying it to the plate-shaped body 12.

Therefore, the water supplied from the supply pipe 15 into the water tank 14 flows through the discharge pipe 13 with the operation of the pump 17, and is discharged from the discharge port of the discharge pipe 13 located above the upper surface of the plate-shaped body 12. The water flows down while forming a water film along the surface of the body 12. At this time, air 18 guided by dust or the like (not shown) flows through the gap between the plate-like bodies 12 and passes through while colliding with the surface of the water film described above.

The water that has reached the downstream end of the plate-shaped body 12 is directly transferred to the water tank 14.
The water flows down into the water, mixes with fresh water supplied from the supply pipe 15, and is led back to the discharge pipe 13 for circulation.

In this case, the water flowing down along the surface of the plate-shaped body 12 is contaminated by adsorbing and absorbing dust, gas, odor, microorganisms, etc. due to air collision. For this reason, pump 1
A discharge pipe 19 for discharging part of the water to the outside is connected to the discharge pipe 13 on the downstream side of the discharge pipe 7, and a valve 20 for adjusting the amount of discharged water is interposed in the middle of the discharge pipe 19. The amount of discharged water is adjusted depending on the purpose, depending on the concentration of dust, gas, odor, microorganisms, etc. in the contaminated water.

However, for applications related to biotechnology, handling of hazardous materials, and radioactivity, it is conceivable to consider a method in which fresh water is simply discharged from the discharge pipe 13 instead of a method in which water is circulated due to its nature.

Furthermore, although the valve 20 is a drain valve, an overflow valve for the water tank 14 may be installed in place of this valve 20.

Now, the elements of the air treatment apparatus 11 shown in FIG. 1 are shown in FIGS. 2 and below.

FIG. 2 shows a partially cut-out structure of the element, in which a large number of plate-like bodies 12 are stacked in the thickness direction. In this case, the adjacent plate-like bodies 12a and 12b are arranged at a certain angle in the longitudinal direction of a flute having a cross section in which peaks and troughs continue alternately (in this embodiment, a wavy cross section).
They are stacked so as to intersect with each other at an angle of 0° or 45''. In this state, for example, as shown in FIG. They are superimposed as shown in FIG. 4 to form the structure shown in FIG.

As shown in Figure 5, where the solid line is the top of the mountain and the broken line is the bottom of the valley,
The back side plate-like body 12b, which is downward to the left, makes point contact with the front plate-like body 12a, which is downward to the right, at the black dots.

As a result, when water is sprinkled from the corrugated cross-section side, when the water flows down the front and back sides of the plate-shaped body 12, the water branches and flows at the point contact area, and the stacking of many plates of the plate-shaped body 12 causes the water to flow down the front and back sides of the plate-shaped body 12. Contact points occur everywhere, allowing water to spread evenly and forming a water film. In FIG. 5, the black dots show only the contact parts of the two plate-shaped bodies 12a and 12b, but the plate-shaped body (not shown) in front of the upper plate-shaped body is removed.
The number of contact areas between the lower plate-shaped body and the deeper plate-shaped body (not shown) increases further. Note that since one branched flow will be smaller than the other depending on the airflow, it is better to shift the inclination angle with respect to the vertical direction.

That is, by making the inclination angle of the left descending plate member 12b steeper than that of the right descending plate member 12a in FIG. 5, the amount of water diverted can be made equal to the air flow from the left side.

The material of the plate-shaped body 12 is preferably one with a hydrophilic surface, such as a composite ceramic thin plate made of glass fiber as an aggregate, but when used for general air conditioning, cellulose fiber with water resistance is preferable. A material such as waterproof paper may be used as the main material. In any case, it is necessary to have a wet strength that can support the amount of water it can hold and the wind pressure of the air flow. Also,
Experimentally, it has been found that the hydraulic diameter of the air flow path is 8 m or more, which is effective in preventing scale growth and reducing the through-flow loss of the air flow.

FIG. 6 shows the flow of air that hits the wall of the longitudinal groove 12c and passes through it. As shown in this figure, the corrugated wall forming the longitudinal groove 12c also serves as a wall for airflow, and the airflow collides with the water film. This collision causes adsorption of dust, gas,
Absorption of odors takes place.

Air flow is easy to use if you use a rotational speed of about 3 m/see, which is similar to heating and cooling, and when the element thickness is about 200 m, the contact coefficient becomes over 80%, but it is still static. The pressure loss is below 7 mAq At.

In this case, the weight velocity of water/weight velocity of air (L/
A value of about 0.01 to 0.4 is good for G), and if it is set to a large value, heating and humidifying effects can be obtained when hot water is used, and cooling and dehumidifying effects can be obtained when cold water is used.

Figure 7 shows the ms+efficiency with respect to the surface wind speed when the device of this embodiment is used as a dust collector, and is based on JIS8
Even if the surface wind speed is increased with type-standard dust, the dust collection efficiency will not decrease much. For example, if the surface wind speed is 80% at a surface wind speed of 1.5 m/g, even if the surface wind speed is 3 m/see. Maintains dust collection efficiency of 70% without decreasing to 40%.

Moreover, in this case, unlike the general filter described in the prior art, cleaning is not necessary, and the dust is also washed away by the flowing water, so that the same effect can be obtained as if the filter were constantly cleaned. Therefore, it is effective not only for air conditioning but also for industrial air treatment including paint mist and oil mist.

In addition, when a high-performance filter is used as the main filter for the purpose of application, if this example filter is used as a pre-filter, water droplets will not be generated, so the main filter will not be wetted by flying water droplets, and white powder and bacteria will not be generated. There is no need to worry about it occurring.

Furthermore, unlike conventional water curtains, collision collection is performed repeatedly, resulting in a high collection rate.

In this example, since the actual collection is not carried out, the efficiency is higher than that of an air washer, and there is no re-scattering of water droplets.

When the device of this embodiment is used as a degassing/deodorizing device, it can be purified with a high collection rate due to air collision collection, which can be calculated by analyzing wastewater, but especially harmful gases and odors can be purified. When it has an affinity for water, its efficiency becomes significantly higher because it has an additional function of absorbing and purifying water. In addition, since the causative substance is contained in the wastewater, its treatment is easy, and since no special chemicals are used, there is no risk of secondary pollution.

When collecting floating microorganisms, it is effective because there is no re-scattering phenomenon because it uses a water film instead of water droplets. Moreover, prevention of re-scattering of water droplets also eliminates the problem of bacteria in the water supply being added due to evaporation.

Even when circulating water is used, the amount of microorganisms in the treated water can be controlled to a safe value by making the water change rate per hour higher than the microbial growth rate per hour.

In addition, as a humidifier, in this embodiment, water droplets are not generated, and only evaporation is performed by the water belly, so no white powder phenomenon occurs, no humidification absorption distance is required, the entire device is compact, and scale growth is reduced. However, by determining the surplus water wheel depending on the quality of the water supply, the concentration of each ion in the water can be controlled.

Furthermore, as a cooler, water evaporates from the water film on the surface of the plate-like body and takes away the latent heat of vaporization, so that a cooling effect is exhibited.

That is, for example, when performing outside air cooling during a mid-term period, especially in modern buildings, which have high insulation and airtightness, outside air cooling is necessary even in winter, and this can be done effectively. In addition, in the summer, air conditioning coolers are generally used for cooling, but even if this example is used as a cooler in the front stage of an air conditioner, humidification will occur along with cooling, and the isohumidity bulb line will appear on the psychrometric diagram. Since cooling occurs along the line, there is no energy saving. However, even if the humidity of the inlet air of the cooler increases, the enthalpy does not increase, and the load on the cooler does not increase. Therefore, a self-cleaning pre-filter is installed upstream of the moisture cooler, which is susceptible to contamination with dust and microorganisms, and high-quality air conditioning can be achieved.

Its shrub embodiment has no moving parts, consumes no energy, is noiseless, has a long lifespan, is easy to maintain, fire resistant, small size, and has low static pressure losses.

<Effects of the Invention> As explained above, in the present invention, dust can be collected, gas odors can be absorbed, and microorganisms can be collected using a water film instead of water droplets.
In addition, since water flows down, a cleaning action occurs and the collision collection efficiency can be increased, making it extremely useful as a humidifier and a cooler.

[Brief explanation of the drawing]

Figures 1 to 7 show embodiments of the present invention, where Figure 1 is a configuration diagram of an example of an air treatment device, Figure 2 is a partially cutaway configuration diagram of an element, and Figure 3 is an exploded perspective view of a plate-shaped body. 4 is a stacking state diagram, FIG. 5 is an explanatory diagram of point contact of plate-like bodies, FIG. 6 is an air circulation state diagram, and FIG. 7 is a diagram of surface wind speed versus dust collection efficiency. In the figure, 11 is an air treatment device, 12, 12a, 12b are plates, 13 is a discharge pipe, 14 is a water tank, 15 is a supply pipe, 16.20 is a valve, 17 is a pump, and 12c is a longitudinal groove. It is. Figure 1 3

Claims (2)

[Claims] (1) A large number of plate-like bodies having cross-sections in which peaks and valleys are continuous and longitudinal grooves are formed from the front and back sides by the peaks and valleys are stacked in the thickness direction, and the adjacent plate-like bodies are stacked together in the thickness direction. The longitudinal grooves are stacked alternately at a certain angle, with the bottoms of the valleys forming the longitudinal grooves of one plate-shaped body and the ridges forming the longitudinal grooves of the other plate-shaped body adjacent to each other. air treatment element in point contact with the top of the air treatment element. (2) An air treatment element constructed by laminating plate-shaped bodies with longitudinal grooves on the front and back sides in the thickness direction is shown in cross section with alternating peaks and valleys on the top surface so that the longitudinal grooves stand up and down. This is a water film type air treatment device in which a water sprinkler is placed above the top surface and a water tank serving as a water receptacle is placed below the bottom surface.