JP2012122682A - Humidification device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the efficiency of humidification, even when the number of spray nozzles is reduced and a humidifying water amount is suppressed.SOLUTION: A humidification device includes a casing through which the atmosphere passes and a humidifying part humidifying the atmosphere in the casing. The humidifying part has a plurality of spray nozzles spouting water particles to the atmosphere. The plurality of spray nozzles are arrayed at predetermined intervals on one plane crossing an atmosphere passing direction.

Description

  The present invention relates to a humidifier, and more particularly to a humidifier incorporated in an air purification system.

Conventionally, an air purification system is sometimes installed at an urban intersection, a tunnel ventilator, or the like to simultaneously remove airborne particulate matter SPM and nitrogen oxides NOx (NO, NO ₂ ). As this air purification system, a system including a humidifier that humidifies the atmosphere and a denitration device that removes nitrogen oxides from the humidified atmosphere is known (see, for example, Patent Document 1).

FIG. 9 is a schematic cross-sectional view showing a schematic configuration of a conventional air purification system. As shown in FIG. 9, the air purification system 100 is provided with a duct 101 that takes in the air, a humidifying device 110 disposed downstream of the duct 101, and a denitration device 120 disposed downstream of the humidifying device 110. ing.
The humidifying device 110 is provided with a casing 111 that forms an air flow path from the duct 101 to the denitration device 120. A large number of spray nozzles 112 are arranged along the inner wall of the casing 111 so as to surround the air flow path (see FIG. 10). Water is supplied to each spray nozzle 112 through a water supply pipe 113.
The denitration device 120 includes a plurality of intake ports 121 that take in the air that has passed through the humidifying device 110, an adsorbent 122 and a denitration tray 123 that are provided corresponding to each intake port 121, and each intake port 121. A plurality of guide portions 124 for guiding the atmosphere to each adsorbent 122 and a plurality of discharge ports 125 for discharging the atmosphere that has passed through the adsorbent 122 in the denitration tray 123 to the outside are provided.

  And the atmosphere (arrow of FIG. 9) which flowed in from the duct 101 is humidified when passing through the humidifier 110 because the water particles are ejected from the spray nozzle 112. The humidified air flows into the denitration device 120 from the intake port 121 and passes through the adsorbent 122 in the denitration tray 123, and is discharged from the discharge port 125 in a state where nitrogen oxides are removed. Thereby, the atmosphere is purified.

JP 2004-243289 A

In recent years, in order to reduce costs, it is desired to reduce the number of spray nozzles 112 installed, reduce the amount of humidified water, and improve the humidification efficiency.
Therefore, an object of the present invention is to increase the humidification efficiency even if the number of spray nozzles is reduced as compared with the conventional one and the amount of humidified water is suppressed.

A humidifier according to the invention of claim 1 is provided.
A casing through which the atmosphere passes;
A humidifying unit for humidifying the atmosphere in the casing,
The humidifying unit has a plurality of spray nozzles that eject water particles to the atmosphere,
The plurality of spray nozzles are arranged at a predetermined interval on a plane that intersects the direction in which the atmosphere passes.

The invention according to claim 2 is the humidifying device according to claim 1,
The plurality of spray nozzles are arranged in a matrix along a plane orthogonal to the air passage direction.

The invention described in claim 3 is the humidifier according to claim 1 or 2,
On the upstream side of the humidifying section, a swirling means that turns the atmosphere into a swirling flow until reaching the humidifying section is provided.

Invention of Claim 4 is a humidification apparatus as described in any one of Claims 1-3,
The spray nozzle is characterized in that the spray angle with respect to the passing direction is adjustable.

  The present inventor has found that, by arranging a plurality of spray nozzles on a plane intersecting with the passage direction of the atmosphere, the humidification efficiency can be improved even if the number of spray nozzles is smaller than the conventional one. . In other words, as in the first aspect of the invention, if a plurality of spray nozzles are arranged at a predetermined interval on a plane that intersects the air passage direction, the amount of humidified water is reduced to a smaller number than before. Even if it suppresses, it becomes possible to improve humidification efficiency.

  According to the invention of claim 2, since the plurality of spray nozzles are arranged in a matrix along a plane orthogonal to the passage direction of the atmosphere, the spray nozzles are arranged uniformly. The atmosphere can be humidified more efficiently.

  According to the third aspect of the present invention, since the swirling means that turns the atmosphere into the swirling flow is provided before reaching the humidifying section, it is possible to lengthen the time until the atmosphere passes through the casing. As a result, the time during which the atmosphere is exposed to water particles can be lengthened, and the atmosphere can be humidified more efficiently.

  According to the fourth aspect of the present invention, since the spray angle with respect to the passing direction in the spray nozzle is adjustable, it is possible to adjust the evaporation time according to the environment by adjusting the spray angle.

It is a schematic cross section which shows the air purification system provided with the humidification apparatus of this embodiment. It is sectional drawing which shows schematic structure of the spray nozzle with which the humidification apparatus of FIG. 1 is equipped. It is a front view which shows the front-end | tip part of the spray nozzle of FIG. It is a front view which shows the arrangement position of the spray nozzle with which the humidification apparatus of FIG. 1 is equipped. It is a side view which shows angle adjustment of the spray nozzle with which the humidification apparatus of FIG. 1 is equipped. It is explanatory drawing which showed the relationship between the injection angle of the spray nozzle of FIG. 2, and evaporation time. It is a front view which shows the modification of the arrangement position of the spray nozzle of FIG. It is a schematic cross section which shows the modification of the humidifier in the air purification system of FIG. It is a schematic cross section which shows the air purification system provided with the conventional humidifier. It is a front view which shows the arrangement position of the spray nozzle with which the humidification apparatus of FIG. 9 is equipped.

Hereinafter, embodiments will be described in detail with reference to the drawings.
FIG. 1 is a schematic cross-sectional view showing a schematic configuration of an air purification system according to the present embodiment. As shown in FIG. 1, the air purification system 1 is provided with a duct 2 that takes in air, a humidifier 3 that is disposed downstream of the duct 2, and a denitration device 4 that is disposed downstream of the humidifier 3. ing.

  The denitration device 4 includes a plurality of intake ports 41 that take in the air that has passed through the humidifying device 3, an adsorbent 42 and a denitration tray 43 that are provided corresponding to each intake port 41, and each intake port 41. A plurality of guide portions 44 for guiding the atmosphere to each adsorbent 42 and a plurality of discharge ports 45 for discharging the atmosphere that has passed through the adsorbent 42 in the denitration tray 43 to the outside are provided.

The humidifier 3 is provided with a casing 31 that forms an air flow path from the duct 2 to the denitration device 4, and a humidifying unit 32 that humidifies the atmosphere within the casing 31.
The humidifying unit 32 includes a plurality of spray nozzles 33 that eject water particles to the atmosphere and a support frame 34 that supports the plurality of spray nozzles 33.
The inside of the support frame 34 serves as a water supply path so that water can be supplied to each spray nozzle 33.

  FIG. 2 is a cross-sectional view illustrating a schematic configuration of the spray nozzle 33, and FIG. 3 is a front view illustrating a tip portion of the spray nozzle 33. As shown in FIG. 2, the spray nozzle 33 includes a cylindrical main body 331 and a nozzle tip 333 fixed to the inner surface of the ejection side wall 332 of the main body 331. In the main body 331, one end of a cylindrical peripheral wall 334 is closed by an injection side wall 332, and an injection hole 335 is provided in the center thereof, while the other end of the peripheral wall 334 is an opening 336. The opening 336 communicates with the supply path, and water flows into the hollow portion 337 of the main body 331 through the opening 336.

  The nozzle tip 333 has a substantially disk shape, is molded when the main body 331 is molded, and is fixed to the inner surface of the injection side wall 332 of the main body 331. The nozzle tip 333 includes an injection hole 338 communicating with the injection hole 335 at the center of the injection side wall 332 of the main body 331, and jets water from the injection hole 338 through the injection hole 335 as a mist. The injection hole 338 includes a tapered hole portion 339 that is reduced in diameter from the inflow side, and a small diameter hole portion 340 that is continuous with the tapered hole portion 339 and communicates with the injection port 335. As shown in FIG. 3, a plurality of turning grooves 341 that are curved in an arc shape with an interval of 90 degrees are formed on the inner surface of the nozzle tip 333. The inner peripheral ends of the swirling grooves 341 are communicated with the peripheral edge of the tapered hole portion 339 so that water flows in through the swirling grooves 341 while swirling water.

In the spray nozzle 33, water flowing from the supply path into the main body 331 passes through the swivel groove 341 of the nozzle tip 333 on the spray side and flows into the tapered hole 339 of the spray hole 338 as a swirl flow. Since the inflowing water collides while turning along the inner peripheral surface of the tapered hole portion 339, the water droplets are refined. A semi-dry fog containing water droplets of fine particles of 10 to 30 μm flows from the tapered hole portion 339 into the small-diameter hole portion 340 on the injection side, and further from the injection port 335 of the main body 331 communicated.
In addition, it is preferable that the pressure of the water supplied to the spray nozzle 33 is set to about 0.1-10 MPa. Moreover, the spray nozzle 33 mentioned above is an example to the last, and it is also possible to apply spray nozzles other than this.

  FIG. 4 is a front view showing the arrangement position of the plurality of spray nozzles 33. As shown in FIG. 4, the plurality of spray nozzles 33 are arranged in a matrix along one plane perpendicular to the atmospheric passage direction X (see FIG. 1). When n-row spray nozzles 33 are arranged in m stages, the total number of spray nozzles 33 is m × n.

Here, each spray nozzle 33 is rotatably attached to the support frame 34 so that the injection angle θ with respect to the passage direction X can be adjusted (see FIG. 5). FIG. 6 is an explanatory diagram showing the relationship between the injection angle and the evaporation time. In the figure, when the line extending from the spray nozzle 33 (representing the path of the injected water particles) is dark, the evaporation time is short, and when the color is thin, the evaporation time is long. As shown in FIG. 6, when the injection angle θ with respect to the atmospheric passage direction X is 0 degree, it can be seen that the evaporation time is the longest. When the spray nozzle 33 is rotated upward, the evaporation time is shortened until the injection angle θ reaches 60 degrees. When the injection angle θ is 90 degrees, the evaporation time is longer. However, when the injection angle θ is 135 degrees and 180 degrees, the evaporation time is shortened. In this way, if the injection angle θ can be adjusted, it is possible to adjust the evaporation time so that the space can be completely evaporated even in a place where there is not much space.
In the above example, up to 180 degrees is shown, but the injection angle θ can be adjusted up to 360 degrees, and in this case, the evaporation time can also be adjusted.

Next, the operation of this embodiment will be described.
The atmosphere (arrow in FIG. 1) flowing in from the duct 2 is humidified when passing through the humidifier 3 because water particles are ejected from the spray nozzle 33. The humidified air flows into the denitration device 4 from the intake port 41 and passes through the adsorbent 42 in the denitration tray 43, and is discharged from the discharge port 45 in a state where nitrogen oxides are removed. Thereby, the atmosphere is purified.

  Here, the actual machine model was analyzed by the air flow analysis simulation for the humidifier 3 of the above embodiment. As the analysis model, the shape was 3D, the turbulent model was k-ε, the steady / unsteady was a steady model, and the heat calculation was assumed. Further, the entrance dimension of the duct 2 in the front view is 1200 mm × 1400 mm, and the internal dimension of the casing 31 in the front view is 1950 mm × 2200 mm. The blowing conditions were an inlet flow velocity: 8.92 m / s, an inlet humidity: 20.0 RH%, an inlet moisture amount: 0.24 vol%, and an inlet temperature: 10 ° C. Nozzle conditions are: average particle size: 20 μm, maximum particle size: 70 μm, cooling water amount: 2.50 l / hr · line, type: 1 fluid empty cone, spray angle: 0 degree with respect to the passing direction X, number of nozzles: 42 This was a book (7 × 6). Based on these conditions, the behavior of water particles in an air stream was calculated using analysis software (FLUENT V6.3). At this time, the mesh was an unstructured lattice, and the shape was created with about 800,000 meshes. In addition, the boundary conditions were sucked from the inlet / outlet, the wall surface of the casing 31 was insulated, and water particles attached to the wall surface were excluded.

  On the other hand, the conventional humidifier 110 was also analyzed by the same air flow analysis simulation as the humidifier 3 of the above embodiment. In addition to the nozzle arrangement position, different conditions compared to the above analysis are the cooling water amount of 2.64 l / hr · nozzle, the number of nozzles: 112, and the spray angle: 90 degrees with respect to the passing direction X. is there.

  Table 1 shows the analysis result of the humidifier 3 of this embodiment and the analysis result of the conventional humidifier 110. Humidification efficiency = amount of evaporated water / (cooling water amount x number of nozzles), wall surface deposition ratio = wall surface water amount / (cooling water amount x number of nozzles), and deposition rate on denitration tray == adsorbent water amount / It is obtained by (cooling water amount × number of nozzles).

As shown in Table 1, the humidification efficiency of the conventional humidifier 110 is about 38%, and most of the results are adhered to the wall surface and the adsorbent 122 in the denitration tray 123 without being used for humidification. Yes.
On the other hand, in the humidifying device 3 of the present embodiment, even if the number of spray nozzles 33 is set to about 1/3 and the amount of spray water is reduced to about 1/3, the humidification efficiency is greatly increased to 97% or more. You can see that it has been raised.

As described above, according to the present embodiment, since a plurality of spray nozzles 33 are arranged at a predetermined interval on a plane intersecting the atmospheric passage direction X, there are fewer spray nozzles than in the past. Even if the spray water amount (humidified water amount) is suppressed as 33, the humidification efficiency can be increased.
Further, since the plurality of spray nozzles 33 are arranged in a matrix along a plane orthogonal to the passage direction X of the atmosphere, the spray nozzles 33 are evenly arranged, and the atmosphere is more efficiently Can be humidified.

Of course, the present invention is not limited to the above-described embodiment and can be modified as appropriate.
For example, in the above-described embodiment, the case where the plurality of spray nozzles 33 are arranged on one plane orthogonal to the passage direction X of the atmosphere is exemplified, but at least on one plane intersecting the passage direction X. It only has to be arranged.
Further, the plurality of spray nozzles 33 may be arranged at any position as long as they are arranged at a predetermined interval on one plane even if they are not arranged in a matrix. For example, as shown by the one-dot chain line in FIG. 7, it is possible to arrange a large number of triangles on one plane and arrange the spray nozzle 33a at the apex of each triangle. It may be a polygon other than a triangle.

  Furthermore, as shown in FIG. 8, swirling means 8 that turns the atmosphere into a swirling flow before reaching the humidifying section 32 may be provided on the upstream side of the humidifying section 32. The swirling means 8 is provided with a plurality of fins 81 having a swirling flow of the atmosphere in a portion serving as an air flow path. As described above, the swirling means 8 that turns the atmosphere into the swirling flow until reaching the humidifying section 32 is provided, so that the time until the air passes through the casing 31 can be lengthened. As a result, the time during which the atmosphere is exposed to water particles can be lengthened, and the atmosphere can be humidified more efficiently.

DESCRIPTION OF SYMBOLS 1 Air purification system 2 Duct 3 Humidification apparatus 4 Denitration apparatus 8 Turning means 31 Casing 32 Humidification part 33 Spray nozzle 34 Support frame 41 Intake port 42 Adsorbent 43 Denitration tray 44 Guide part 45 Discharge port X Passing direction

Claims (4)

A casing through which the atmosphere passes;
A humidifying unit for humidifying the atmosphere in the casing,
The humidifying unit has a plurality of spray nozzles that eject water particles to the atmosphere,
The humidifying apparatus, wherein the plurality of spray nozzles are arranged at a predetermined interval on a plane that intersects with the direction in which the atmosphere passes. The humidifying device of claim 1,
The humidifying apparatus, wherein the plurality of spray nozzles are arranged in a matrix along a plane orthogonal to the air passage direction. The humidifier according to claim 1 or 2,
A humidifying device characterized in that swirling means for swirling the atmosphere is provided on the upstream side of the humidifying section before reaching the humidifying section. In the humidification device according to any one of claims 1 to 3,
The humidifying device, wherein the spray nozzle is capable of adjusting a spray angle with respect to the passing direction.