JPH034934A - Packing plate for gas-liquid contact - Google Patents

Abstract

PURPOSE:To efficiently form a wet wall by a small amount of water by a method wherein the heat exchange region on the surface of a plate is made almost flat as a whole and a large number of fine wavy uneven parts having ridges expanding to the inside and outside continuing almost horizontally in the lateral direction are formed to said region. CONSTITUTION:A liquid is allowed to flow down along the surface of a thin plate material to form a wet wall and heat exchange is performed by latent heat action accompanied by the direct contact with a gas stream. The heat exchange region on the surface of this gas-liquid contact packing plate 10 is made almost flat as a whole. A large number of fine wavy uneven parts 12 having ridges expanding to the inside and outside continuing almost horizontally in the lateral direction are densely formed to said region in parallel to each other in the height direction thereof, that is, in the liquid flow-down direction and the heat exchange region B of this packing plate 10 is set to a self-wettable water retention surface BO. As the result, a wet wall can be efficiently formed to the heat exchange region by a small amount of water.

Description

Detailed Description of the Invention A11 Purpose of the Invention <Industrial Application Field> This invention aims to reduce the amount of latent heat generated by flowing a liquid along the surface of a sheet-like base material to form a wet wall and to reduce the effect of latent heat due to direct contact with airflow. This invention relates to a packing plate for gas-liquid contact that performs heat exchange.

<Prior art> This type of filling plate is made by bending a sheet-like base material made of synthetic resin sheet 1 into a zigzag shape to form a corrugated plate, with the ridge lines of the corrugated plate standing vertically. There is one that arranges these corrugated plates and allows liquid to flow down the plate surface.

<YAM to be solved by the invention> In the packed plate of the prior art, the liquid adhering to the plate surface flows only in the vertical direction, hardly diffuses in the horizontal direction, and flows down in a short period of time to form gas-liquid contact. Since the efficiency is low, in order to improve this drawback, relatively large irregularities are provided on the entire slope of the corrugated plate to promote the diffusion of liquid in the lateral direction.

However, even with this unevenness, the gas-liquid contact efficiency is not sufficient, so in order to improve this, there are some products in which the ridgeline of the corrugated plate is sloped and small holes of about 5 rrn are made on the entire surface.
Since the substrate is a synthetic resin sheet, it has poor self-wetting properties.

In order to improve this self-wetting property, the entire surface of this corrugated board was treated with a satin finish, and holes from 0.1 micron to 4 m were formed on the entire surface, giving it a certain degree of self-wetting property.
It is described in Japanese Patent No. 3-16823.

However, in the method disclosed in Japanese Utility Model Application Publication No. 63-16823, since the sheet-like substrate is bent in a zigzag shape to form a corrugated board, the resistance of air flow between adjacently arranged filling plates becomes large. , it has the disadvantage of increasing the load on the blower.

In order to reduce the air resistance of the gas-liquid contact plate, which is a completely corrugated plate, a completely flat filling material was created by vacuum forming a synthetic resin sheet and forming an uneven wave pattern on the entire surface of the board. -31421 and Utility Model Publication No. 63-44101, the size of the concave-convex pattern forming the slow-flowing portion of the liquid is 6~loan, and the height of the protrusion is large, and the air resistance still remains. is large, and the above-mentioned Utility Model Application No. 63-1
Unlike No. 6823, it does not have self-wetting properties and cannot increase gas-liquid contact efficiency.

The purpose of this invention is to make the heat exchange area on the plate surface generally flat as a whole, and to give characteristics to the wave-like unevenness formed in this area to form a self-wetting water-retaining surface, which can be used with a small amount of water supply. The purpose of the present invention is to provide the market with a packing plate for gas-liquid contact that has low air resistance and is capable of efficiently forming a wetted wall in a heat exchange area.

1. Structure of the Invention and Means for Solving the Problems> In order to solve the above problems, the present invention allows a liquid to flow down along the surface of a thin plate material to form a wet wall and absorb latent heat due to direct contact with the air flow. In a packed plate for gas-liquid contact that performs heat exchange by action, the heat exchange area on the plate surface of this base material is generally flat as a whole, and the area has a bulge on the front and back that extends approximately horizontally in the width direction. A material characterized in that a large number of fine wave-shaped uneven parts having ridges are densely formed parallel to each other in the height direction, that is, in the direction of liquid flow, and the heat exchange area of this base material is a self-wetting water-retaining surface. It is.

The filling plate is preferably made of a thermoplastic synthetic resin plate in terms of its molding.

The self-wetting water-retaining surfaces formed on the front and back surfaces of the filling plate are formed by sand blasting, corona discharge machining, fine powder particle coating, etc.
By any one or more processing methods.

A rough hydrophilic surface is convenient for forming a wetted wall.

The shape of the fine wave-shaped uneven portion has a wave height of 3nn+
30m to 30m, wave crest pitch 511I11 to 15mm
, the depth in the thickness direction of the filling plate is 1.5nn+ to 3mm, the width of the ridge or groove is 2nn to 3mm, and the inclination angle is 3mm.
It is preferable for the water retention function to be between 60 degrees and 60 degrees.

The pitch between the adjacent ridges is preferably 4 to 6 m in terms of air resistance and water retention surface formation.

A large number of inclined ridges for removing water droplets may be formed at the airflow inflow side end and the airflow outflow side end of the filling plate.

It is desirable that each end of the base material on which the inclined ridges for removing water droplets are formed is curved in a wave-like manner in the thickness direction, in order to prevent carryover of water droplets.

It is preferable for positioning when the filling plates are arranged in parallel that a spacer bulge is integrally formed on one surface of the filling plate.

Function> The function of the packing plate for gas-liquid contact of the present invention constructed as described above will be explained together with its method of use.

b) When used as part of a cross-flow cooling tower.

A plurality of packing plates for gas-liquid contact according to the present invention are arranged vertically in parallel at intervals with the direction of the ridges being horizontal under the upper water tank of a cross-flow type cooling tower, and these filling plates are inserted from the upper water tank. Cooling water is sprayed on top, and air is passed through the gas-liquid passages between adjacent filling plates in a horizontal direction perpendicular to the direction in which the cooling water flows down.

The cooling water that flows over the surfaces of these filling plates and forms the wetted walls is brought into direct contact with the air flow, and the cooling water is cooled by its latent heat action.

At this time, the cooling water flowing on the plate surface of the filling plate starts to accumulate from each valley of the uppermost ridge, temporarily stays and retains water by the depth of this uneven part and the height of the wave crest, and then the entire length of this ridge. If more water is supplied than the water retention capacity of this ridge, it will overflow over this ridge, flow down to the adjacent lower ridge through the flat part of this board surface, and then flow down to the adjacent lower ridge again. Water begins to accumulate in the valleys of the ridges, and after a certain amount of water accumulates and is retained, it slowly flows over the ridges and flows down to the next ridge.

In this way, the cooling water sequentially accumulates along all the ridges, spreads laterally, and flows down the board surface, forming a wet wall over the entire heat exchange area of the board surface. .

The cooling water that has formed a wet wall in this way is cooled by direct heat exchange with the air flow while flowing down, and is then sent from the lower water tank of the cooling tower to a load section such as a refrigerator to perform work. After finishing and raising the temperature, it is returned to the upper water tank, cooled again, and used for circulation.

When the self-wetting water-retaining surface is processed into a rough hydrophilic surface as described above, the time for which the cooling water is temporarily retained along each soft part and retained becomes longer.

The shape of each of the wave-shaped uneven portions is such that the wave height is 3 an to 30 nu, the wave crest pitch is 5 m to 15 W11, and the depth in the substrate thickness direction is 1.5 m.
m to 3nn+, the width of the ridges or grooves is 2an to 3mm, the inclination angle is 3 degrees to 60 degrees, and the pitch of adjacent ridges is 4 mm to 61 m.
In the packing plate for gas-liquid contact, a wetted wall continues to be formed throughout the generally flat heat exchange area with a small amount of cooling water in each case due to the water retention effect between the many ridges during the operation of the cooling tower. .

At the same time, air resistance when passing through the gas-liquid passage becomes smaller.

° Also, the airflow inflow side end and the airflow outflow side end of the base material are
A filling plate for gas-liquid contact characterized in that a large number of inclined ridges for removing water droplets are formed, and each end of the base material on which the inclined ridges for removing water droplets are formed, in the thickness direction. In the filling plate characterized by being curved in a corrugated manner, any water droplets of the cooling water carried by the air flow flowing through the air-liquid passage are captured by the water droplet removal inclined ridges, No carryover from the cooling tower outside air intake or exhaust port.

The water retention effect of the filling plate is the same when the filling plate of the present invention is incorporated into a countercurrent cooling tower.

(1) When the gas-liquid contact filling plate of the present invention is used as a heat exchange material for a vaporization humidifier used in combination with an air conditioner or an air conditioning module.

A plurality of filling plates for gas-liquid contact of the present invention are arranged vertically in parallel under the upper water sprinkling device of this evaporative humidifier in the same way as described above (a), and liquid is similarly filled from this water sprinkling device. Scatter it on the surface of the plate, and form a wet wall over the entire heat exchange area with a small amount of liquid in the same manner as in step (a) above.

On the other hand, the operation of the air conditioner or air conditioning module circulates the indoor air through the humidifier.

For example, indoor air that has reached a temperature of 20°C and a relative humidity of 15% due to the use of a heating system in winter is passed horizontally into a gas-liquid passage formed between adjacent gas-liquid contact filling plates, and while passing through this gas-liquid passage, , by bringing this air into direct contact with the wet wall, the latent heat action cools the liquid flowing down the board surface, increasing the relative humidity of the heated air to around 55% to 77%, and improving the indoor living environment in winter. Optimize.

c) When used as a cooling panel.

A frame with an upper sprinkler pipe and a lower drainage gutter is attached to one wall of the building, and a blower is installed on the opposite wall.

A plurality of gas-liquid contact filling plates are assembled to the frame in parallel at intervals between the upper water sprinkling pipe and the lower drainage groove.

Next, water is sprayed from the upper water pipe onto these filling plates, and the cooling water is temporarily retained and retained on the ridges formed on the surface of each filling plate in the same manner as in (a) above, and then allowed to flow down one after another to spread over the entire heat exchange area. form a wet wall.

Meanwhile, operate the blower to reduce the air pressure inside the building,
Outside air is drawn into the building through the air-liquid passages between these filling plates, and while passing through the air-liquid passages, the air and water come into direct contact, increasing the relative humidity and temperature of the air, and lowering the temperature of the sprayed water. Lower it.

This cooled, temperature-controlled spray water is received in the lower drainage gutter and used for circulation, while also controlling the relative humidity in a building, such as a greenhouse, to a value of 50% to 80%, which is sufficient for plant growth, and the temperature in the greenhouse. Maintain at 22°C to 28°C throughout the seasons.

2) When used as an air-cooled heat exchanger (play cooler) for a condenser.

In this case, the fluid flowing into the condenser is passed through the gas-liquid passage between the gas-liquid contact filling plates of the present invention, increasing the cooling capacity of the condenser and reducing the total energy consumption.

e) When used as an eliminator In this case, the gas-liquid contact filling plates of this invention are placed in parallel on the downstream side of an air conditioner or humidifier, and water droplets in the air flow are captured by the uneven parts of the ridges of each filling plate. do.

The gas-liquid contact packing plate of the present invention can be used as appropriate as described in (a) to (e) above.

<Example> Representative embodiments of the invention will now be described.

In FIG. 1, A is a gas-liquid contact filling plate made of a sheet-like filling plate 10 made of thermoplastic synthetic resin such as PVC, and a heat exchange area B on the plate surface of this filling plate 10 is generally flat as a whole. In the area B, a large number of fine wavy uneven parts 12 having ridges 11 extending in the width direction, that is, the horizontal direction, and bulging on the front and back sides are formed densely and parallel to each other in the height direction, that is, in the liquid flow direction. The heat exchange area B of this filling plate 10 serves as a self-wetting water retention surface BO.

The self-wetting water-retaining surfaces BO formed on the front and back surfaces of the filling plate 10 are made into hydrophilic rough surfaces by any one or more processing methods among sand blasting, corona discharge machining, and fine powder particle adhesion. Although this is preferable in terms of forming a wetted wall, the invention is the same even if the filling plate A is formed as it is by a processing method such as vacuum forming without performing such processing.

The shape of the fine wave-shaped uneven portion 12 has a wave height h of 3.
mm to 30IIn, wave crest pitch P is 5mm to 15
+nn+, depth d in the thickness direction of the substrate 10 is 1.5 m to 3 m
rrrnThe width d of the ridge 11 or groove is 2 m to 3 m,
The inclination angle θ of the waveform is 3 degrees to 60 degrees.

Furthermore, the pitch P of the vertically adjacent ridges 11. is 4~6+nm
It's Toshide.

In the drawings, in order to show the overall shape, the shape is exaggerated regardless of the dimensions.

The ends 13 and 14 of the filling plate 10 are formed with inclined ridges 15 for removing water droplets at the airflow inflow side end 13 and the airflow outflow side end 14 of the filling plate 1o. The filling plate 10 is curved in a wave-like shape, and spacer bulges 16 are integrally formed on one surface of the filling plate 10 at intervals.

17 are inclined in the same direction at intervals in the horizontal direction in order to guide the cooling water to each valley llb of the uppermost ridge 11a formed along the upper edge of the gas-liquid contact filler A. This is an inclined protrusion formed.

Similarly, between the lowermost ridge 11c formed along the lower edge of the gas-liquid contact filler A and this lower edge, the cooling water overflowing from each valley of the lowermost ridge 11c is disposed. Slanted protrusions 18 are formed obliquely at intervals in the horizontal direction and inclined in the same direction for guiding downward toward the center of the filling plate.

Note that the shape of the ridges 11 is not limited to the triangular wave of this embodiment, but may be curved as shown in FIG.

The operation of the embodiment configured as described above and its usage method are as follows:
The contents described in the above section and the protrusion 17.1
Since they are the same except for the effect on protrusion 1, here we use protrusion 1.
Only the effect of 7.18 will be explained, and the explanation of other effects will be omitted.

As described above, by the plurality of inclined protrusions 17 provided on the upper edge side, the cooling water sprinkled on the upper edge of the gas-liquid contact filler A is guided and supplied sequentially to each valley part 10b of the uppermost ridge 11a. After temporarily staying and retaining water along this ridge 11a, the water overflows over this ridge 11 and flows into the next ridge 11.

In addition, the cooling water overflowing from the lowest ridge 11b flows out from the lower edge of the gas-liquid contact filler A while being tilted toward the center by the inclined protrusion 18, and is collected at a predetermined position. .

C8 Effects of the invention In the gas-liquid contact filling plate of the present invention configured as described above and whose self-lubricating water-retaining surface has the function of temporarily retaining cooling water and retaining water as described above, By allowing a small amount of liquid to flow down onto the surface of the filling plate using the ridges that bulge out on the front and back sides.

Sufficient water can be stored on the plate surface to form a wet wall over the entire heat exchange area, and since it flows down slowly and sequentially, the liquid can be cooled by direct contact with the air flow, and there is enough time to vaporize it, allowing it to vaporize. The cooling effect due to the latent heat is also fully exhibited.

Further, since the ridges are formed of fine wave-shaped uneven parts, the resistance of the air flowing in the air-liquid passage is also small.

As a result, when a large number of these filling plates are installed in parallel and used, in order to obtain the same heat exchange rate, the dimensions between each filling plate can be narrower than conventional ones without increasing the load on the blower. Therefore, the space occupied by this group of packed plates can be reduced, and water sprinklers such as cooling towers, humidifiers, and pre-coolers can be downsized.

Furthermore, if the volume is the same, a heat exchanger with a higher heat exchange rate than the conventional one can be obtained.

If the filling plate is made of a thermoplastic synthetic resin plate, the filling plate can be mass-produced at low cost.

The self-wetting water-retaining surfaces formed on the front and back surfaces of the filling plate are made into hydrophilic rough surfaces by any one or more of sandblasting, corona discharge machining, and fine powder particle adhesion, so that cooling water can be The water retention effect is further enhanced, and a sufficient wet wall can be formed even with a smaller amount of cooling water.

The shape of the fine wave-shaped uneven portion is such that the height of the wave is 3I to 30 nm, the pitch of the wave crest is 5 mm to 15 mm, the depth in the substrate thickness direction is 1.5 mm to 3 mm, and the width of the ridge or groove. By setting the angle of inclination to 3 to 60 degrees, the water retention function of this cooling water can be further improved and air resistance can be further reduced.

If the pitch between the adjacent ridges is 4 to 6 mm, air resistance and water retention function can be maintained well.

By forming a large number of inclined ridges for removing water droplets at the airflow inflow side end and the airflow outflow side end of the base material, it is possible to prevent the cooling water from scattering to the outside.

Each end of the base material on which the inclined ridges for removing water droplets are formed is curved in a wave-like shape in the thickness direction, so that carryover of water droplets can be more reliably prevented.

By integrally forming a spacer bulge on one surface of the base material, the filling plates can be quickly arranged in parallel.

<Effects Unique to the Embodiment> In the embodiment, by providing the inclined ridges 17 and 18, the cooling water flows smoothly into and out of the gas-liquid contact filling plate A without scattering the cooling water. be able to.

In addition, even if the self-wetting water-retaining surface on the surface of the filling plate is not made into a hydrophilic rough surface, when used as a normal cooling tower, 2 to 3
After continuous operation for a week, the silica contained in the cooling water,
Calcium, sludge, etc. adhere to the water retaining surface, forming a hydrophilic rough surface.

In the above embodiment, the ridges 11 are horizontally continuous in the width direction of the filling plate A, but when air flows horizontally, the windward side is high and the leeward side is low. Even if the entire ridge 11 is inclined at a slight angle (approximately 5 degrees), this invention is the same. In this case, it is possible to effectively prevent liquid from scattering from the outside air intake port.

[Brief explanation of the drawing]

The figures are related to this invention.
FIG. 2 is a partially omitted front view of the embodiment, FIG. 3 is a partially omitted plan view, FIG. 3 is a partially schematic diagram showing the shape of other ridges, and FIG.
The figure is an enlarged front view showing the relationship between adjacent ridges, and FIG. 5 is a side view thereof. Explanation of the main symbols in the diagram A... Packing plate for gas-liquid contact, 11...
...ridge.

Claims (1)

[Scope of Claims] 1) A gas-liquid contact filling plate that allows liquid to flow down along the plate surface of a thin plate material, forms a wet wall, and exchanges heat by the latent heat effect due to direct contact with the air flow. The heat exchange area on the plate surface is generally flat as a whole, and the area has fine wavy unevenness in the width direction with ridges that bulge out on the front and back sides that are connected almost horizontally, and in the height direction, that is, the heat exchange area is generally flat. A packed plate for gas-liquid contact, characterized in that a large number of heat exchange regions of the base material are formed densely in parallel to each other in the direction of liquid flow and serve as a self-wetting water retention surface. 2) The filling plate for gas-liquid contact according to claim 1, characterized in that it is made of a thermoplastic synthetic resin plate. 3) The self-wetting water-retaining surfaces formed on the front and back surfaces of the filling plate are made into hydrophilic rough surfaces by one or more arbitrary processing methods among sandblasting, corona discharge machining, and fine powder particle coating. Claim 1 or 2
Packing plate for gas-liquid contact as described in section. 4) The shape of each of the fine wave-shaped uneven parts has a wave height of 3
mm to 30mm, wave crest pitch 5mm to 15mm
, the depth in the thickness direction of the filling plate is 1.5 mm to 3 mm, the width of the ridges or grooves is 2 mm to 3 mm, and the inclination angle is 3 degrees to 60 degrees. The filling plate for gas-liquid contact according to item 2 or 3. 5) The filling plate for gas-liquid contact according to claim 2 or 3, wherein the pitch between the adjacent ridges is 4 mm to 6 mm. 6) At the airflow inflow side end and the airflow outflow side end of the filling plate,
The filling plate for gas-liquid contact according to claim 1 or 2, characterized in that a large number of inclined ridges for removing water droplets are formed. 7) Each end of the filling plate on which the inclined ridges for removing water droplets are formed is curved in a waveform in the thickness direction thereof, according to claim 1 or 2. Packing plate for gas-liquid contact. 8) The filling plate for gas-liquid contact according to claim 1 or 2, wherein a spacer bulge is integrally formed on one surface of the base material.