JP6805778B2 - Strainer for watering nozzle - Google Patents

Description

The present invention relates to a strainer for watering nozzles arranged in cooling tower.

There is a regulation on the upper limit of the discharge temperature for process wastewater generated in the mining industry, and cooling towers are widely used to reduce the process wastewater to below the regulated temperature. Various types of cooling towers are known, but the process wastewater stored in the upper water tank of the tower is sprinkled downward in a shower shape to contact the outside air (hereinafter also referred to as "aeration") and exchange heat. A method of lowering the temperature to about the temperature is known.

The watering nozzle in the cooling tower communicates with the drainage port provided in the upper water tank and is attached downward. The process wastewater drained from the drain port of the upper water tank flows in from the inlet flange formed at the upper end of the watering nozzle, passes through the main body pipe, and collides with the ring-shaped watering plate attached to the lower end of the watering nozzle. And disperse radially. Process wastewater does not always have a uniform aqueous phase, and often contains solid components like hot spring water. This solid component aggregates in the piping that supplies the process wastewater to the cooling tower and grows into agglomerates, that is, scales.

The scale may peel off from the inner wall of the water tank or the like adhering during the growth process and be mixed with the process wastewater. In this way, although a part of the scale that has flowed into the watering nozzle due to the process wastewater falls inside the tower, most of it is placed in the watering plate attached to the lower end of the nozzle. If the inflow of process wastewater continues in this situation, the nozzle will be blocked by the accumulation of scale in the main body pipe portion.

If the watering nozzle is left in a closed state, the process wastewater may stop sprinkling inside the tower, and the process wastewater may overflow from the upper water tank to the outside of the system. In order to avoid this problem, regular inspections and associated cleaning are required. The inspection items are firstly to check the water level of the upper water tank and secondly to confirm whether or not the watering nozzle is blocked. If any abnormality is found in the regular inspection, remove the upper water tank, the watering nozzle, and the scale accumulated inside each.

In particular, when the process wastewater is hot spring water, the watering nozzles are frequently blocked because scales are likely to accumulate inside the upper water tank and the watering nozzles. To avoid this, the burden of work required for regular inspections and cleaning increases.

For example, in the case of Comparative Example 1 described later, since cleaning that requires one hour by two workers is performed four times a week, the total working time is eight hours a week in terms of one worker. Even in the case of Comparative Example 2 described later, it was confirmed that one person spends four hours every week. In order to reduce such a burden, a technique for suppressing blockage of the watering nozzle is required.

On the other hand, in Patent Document 1, in a wet exhaust gas desulfurization apparatus provided with a cooling tower, a blockage covering an opening is allowed so as to allow passage of only a small scale and an absorbent slurry and prevent passage of a large scale. Preventive protectors are disclosed. Further, Patent Document 2 discloses an exhaust gas treatment apparatus that monitors the phosphoric acid concentration of make-up water and adjusts the pH as necessary to suppress the generation of scale.

Japanese Unexamined Patent Publication No. 1-245837 Japanese Unexamined Patent Publication No. 2011-147881

However, the protector for preventing blockage described in Patent Document 1 has an effect of preventing the blockage of the watering nozzle when a small amount of scale is deposited, but the protector is buried in the scale when a large amount of scale is deposited. As a result, the inflow of process wastewater is hindered, so that the substantial effect of preventing blockage is small.

Further, the exhaust gas treatment device described in Patent Document 2 requires equipment and materials such as a monitoring device and a pH adjuster. Therefore, in order to prevent the clogging of the watering nozzle where the scale is constantly generated, such as the cooling tower that aerates and cools the process wastewater generated in the mining industry, consumables and other costs are high, so it is not possible to adopt this. Have difficulty.

The present invention has been made in view of such a problem, and an object of the present invention is to reach the watering nozzle even if the scale contained in the process wastewater is deposited around the drainage port communicating with the watering nozzle. In addition to preventing the watering nozzle from being blocked without hindering the inflow of wastewater, it is easy to remove the scale captured by the dust-removing flange during regular cleaning, and watering can save labor in maintenance work. The purpose is to provide a strainer for a nozzle.

The present inventors have diligently studied the shape of a wire mesh (strainer for a watering nozzle) installed at a drainage port communicating with a watering nozzle, and have found a shape that can solve the problem, and completed the present invention.

The present invention is a watering nozzle strainer (50, 51, 52) arranged in a cooling tower (100) for aerating and cooling process wastewater (5) containing a solid component (1).
The cooling tower (100)
The upper water tank (10) in which the process wastewater (5) is stored at a predetermined water level (J), and
A watering nozzle (20) capable of sprinkling water downward from a drain port (12) bored in the bottom plate (11) of the upper water tank (10).
With
The drainage port (12) is formed by a mesh filter medium having a predetermined opening (G) extending above the predetermined water level (J) to a height (H) from the bottom plate (11). It is partitioned by a siege net (31, 32, 33) formed larger than the diameter (D) of 12).
The net-like filter medium is made of a metal net having a mesh size (G) of 3 to 10 mm, and has a diameter (M) of a peripheral edge portion (34) forming below the surrounding net (31, 32, 33) of 40 to 40 to. 120 mm, the height (H) is formed to be 30 to 70 mm,
The flange portion (35) extends horizontally from the peripheral portion (34).

Further, in one aspect of the present invention, the net-like filter medium has a dome shape that continuously covers the drainage port (12) from the peripheral portion (34) to the upper portion (37) of the surrounding net (33). preferable.

Further, in one aspect of the present invention, it is assumed that the process wastewater (5) is hot spring water.

According to the present invention, even if a large amount of scale is contained in the process wastewater and it accumulates around the drain port of the watering nozzle, it does not hinder the inflow of the process wastewater into the watering nozzle and prevents the watering nozzle from being blocked. In addition, it is possible to provide a watering nozzle strainer that can easily remove the scale trapped in the dust-removing flange portion during regular cleaning and save labor in maintenance work.

FIG. 1A is a front view showing a usage state of a watering nozzle in which a watering nozzle strainer according to an embodiment of the present invention (hereinafter, also referred to as “the strainer”) is arranged, and FIG. 1 (A) is a conical surrounding net. , FIG. 1 (B) shows a cylindrical siege net, respectively. It is an external view which shows the metal net before being processed into this dome-shaped strainer, FIG. 2A is a plan view, and FIG. 2B is an enlarged plan view for explaining the opening. There is. It is an external view which shows this dome-shaped strainer, FIG. 3A is a front view, FIG. 3B is a perspective view, and FIG. 3C is a plan view. It is a front view which shows the use state of the watering nozzle which arranged this dome-shaped strainer. It is a figure explaining the watering nozzle which does not use this strainer, FIG. 5A shows the front sectional view in the use state, and FIG. 5B shows the perspective view of a single body. It is a front sectional view which shows the use state of the watering nozzle strainer (hereinafter, also referred to as "flat wire mesh strainer") by the flat wire mesh which concerns on a comparative example. It is a front sectional view which shows the use state of the watering nozzle strainer (hereinafter, also referred to as "the dish-shaped wire mesh strainer") by the submerged dish-shaped wire mesh which concerns on a comparative example.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the present embodiment described below does not unreasonably limit the content of the present invention described in the claims, and all the configurations described in the present embodiment are essential as a means for solving the present invention. Is not always the case. Further, throughout the drawings, members and parts having the same effect are designated by the same reference numerals even if there are slight differences in outer shape to avoid duplication of description.

FIG. 1 is a front view showing a usage state of a watering nozzle in which the strainer is arranged. FIG. 1 (A) shows a conical siege net, and FIG. 1 (B) shows a cylindrical siege net. There is. Reference numeral 100 in FIG. 1 means the entire cooling tower. The cooling tower 100 to which the present invention is applied is a large-scale one having a height of 10 m above the ground for aerating and cooling process wastewater 5 such as hot spring water containing a solid component 1. However, since the cooling tower 100 itself is well known, detailed description of the overall external view and piping and the like will be omitted.

The cooling tower 100 is mainly composed of an upper water tank 10 and a watering nozzle 20, and is provided with pumps and pipes (not shown) to support them as a whole. In the upper water tank 10, the process wastewater 5 is stored while securing a predetermined water level J. The watering nozzle 20 includes a main body pipe portion 29 capable of passing water in the vertical direction, an inlet flange 28 formed at the upper end opening of the main body pipe portion 29, and ring-shaped watering plates 21 and 22 attached to the lower end. It is composed of. Slits are formed in the sprinkler plates 21 and 22 between the lower ends of the main body pipe portion 29 and the mutual spacing.

The watering nozzle 20 communicates downward from the drain port 12 formed in the bottom plate 11 of the upper water tank 10. The process wastewater 5 flows into the watering nozzle 20 from the drain port 12 of the upper water tank 10, passes through the main body pipe portion 29, collides with the ring-shaped watering plates 21 and 22, and is sprinkled in a downward shower shape. ..

The strainer 50 shown in FIG. 1A is mainly composed of a conical siege net 31 and partitions the drainage port 12 from the surroundings. Without the strainer 50, as shown in FIG. 5 and described later, the scale 2 flows into the watering nozzle 20 along with the process wastewater 5, and although a part of the scale 2 falls into the tower, most of the scale 2 is at the lower end of the nozzle. It is fastened with the watering plates 21 and 22 of. The process wastewater 5 continuously flows in to block the main body pipe portion 29 of the watering nozzle 20.

The siege net 31 is composed of a net-like filter medium having a predetermined opening G, and has a function of blocking the large scale 2 from flowing in from around or above the drain port 12 and filtering and passing almost only water. .. The siege net 31 does not necessarily have to be completely covered up to a high position directly above the drainage port 12, and it is sufficient if the siege net 31 has a shape extending above the predetermined water level J to a height H from the bottom plate 11. ..

The net-like filter medium is made of a metal net (see FIG. 2) having an opening G of 3 to 10 mm, and the diameter M of the peripheral edge 34 forming below the surrounding net 31 is 40 to 120 mm, and the height H is 30 to 70 mm. It is formed, and the flange portion 35 extends horizontally from the peripheral edge portion 34 to form the entire watering nozzle strainer 50.

The strainer 51 shown in FIG. 1B is mainly composed of a cylindrical siege net 32, and the drainage port 12 is partitioned from the surroundings. Configuration and function of the watering nozzle strainer 50 having the conical siege net 31 shown in FIG. 1 (A), except that the watering nozzle strainer 51 of FIG. 1 (B) is a cylindrical siege net 32. Is equivalent to.

The shapes of the strainers 50 and 51 may be slightly deformed as long as they satisfy the above-mentioned conditions. That is, in the case of the surrounding nets 31 and 32 whose height H is higher than the steady water level J = 30 mm of the upper water tank 10, the upper surface may be open or closed by a lid-shaped wire mesh.

However, if the water flow of the process wastewater 5 is strong, there is a possibility that the small scale 2 rides on the flow, gets over the upper surfaces of the strainers 50 and 51, and falls inside the cooling tower 100. In order to prevent this, it is preferable to have a shape closed by a lid-shaped wire mesh. The dome-shaped strainer 52 improved in this respect will be described below with reference to FIGS. 2 to 4.

2A and 2B are external views showing a metal net before being processed into a dome-shaped main strainer, FIG. 2A is a plan view, and FIG. 2B is an enlarged plan view for explaining the opening. Are shown respectively. As shown in FIG. 2A, the metal net is made of a metal net having a mesh size of 3 to 10 mm, and it is sufficient if the metal net has a size that can secure at least a diameter E = 150 mm as a circular plane F. Note that FIGS. 2 to 4 exemplify a square material (one side is 180 mm) having a size that can secure a diameter E = 180 mm as a circular plane F.

The shape of the outer edge may be square or rectangular as long as the circular plane F is included. The metal net illustrated in FIG. 2 (A) has a square outer edge, one side of which is 180 mm, and the number of stitches on one side is 18. Further, as shown in an enlarged manner in FIG. 2B, the wire diameter of the metal net is K = 1 mm and the opening G = 9 mm.

3A and 3B are external views showing a dome-shaped main strainer, FIG. 3A is a front view, FIG. 3B is a perspective view, and FIG. 3C is a plan view. As shown in FIG. 3, in the dome-shaped main strainer 52, the height H of the central top P is 30 on the circular plane F with respect to the square metal net having one side of the outer edge of 180 mm and shown in FIG. 2 (A). It is bent so as to form a dome shape having a diameter M of about 70 mm and a peripheral edge portion 34 forming the bottom portion of 40 to 120 mm.

Further, in the dome-shaped strainer 52 illustrated in FIG. 3, good results were obtained by setting the height H of the central top P to 50 mm and the diameter M of the peripheral edge 34 forming the bottom to 82 mm. Note that FIG. 3 is merely a schematic diagram for simply explaining that the metal net is bent to form a dome shape. Therefore, the actual condition of the strainer 52 is not a geometrically orderly appearance as shown in FIG. In particular, the way the peripheral edge portion 34 is bent is obtuse and gentler than the shape shown in the figure. The same applies to FIG. 4 in that respect.

FIG. 4 is a front view showing a usage state of the watering nozzle in which the dome-shaped main strainer is arranged. As shown in FIG. 4, since the net-like filter medium constituting the strainer 52 is configured to continuously cover the upper portion 37 of the surrounding net 33, if the strainer 52 is covered from above the drainage port 12, the entire circumference and It is possible to prevent the scale 2 from flowing into the drain port 12 from above.

Further, in the strainer 52, a collar portion 35 extends horizontally from the periphery of the peripheral edge portion 34 corresponding to the bottom portion of the dome shape, and the scale 2 is accumulated on the collar portion 35 with use. .. The flange portion 35 makes it difficult for the scale 2 deposited around the drain port 12 to fall downward, that is, inside the cooling tower 100. In addition, during regular cleaning, scale is accumulated on the collar 35 instead of "dustpan", so that it can be easily moved and removed, which saves the trouble of cleaning.

As described above, in the strainer 52, since the material of the mesh filter medium does not pass through the scale 2 and the process wastewater 5 passes through, the scale 2 does not flow into or drop into the cooling tower 100. Further, even if the scale 2 is deposited around the inlet flange 28 forming the upper end of the watering nozzle 20, it does not prevent the process wastewater 5 from flowing into the watering nozzle 20 and can prevent the watering nozzle 20 from being blocked. Is. Further, the process wastewater 5 can flow in without being disturbed at all even when the scale 2 is deposited to some extent. As a result, the operating upper water tank 10 can easily maintain a predetermined water level J, and can continue to operate satisfactorily.

The strainers 50 and 51 shown in FIGS. 1 (A) and 1 (B) have the same effects as those of the strainer 52. The strainers 50, 51, and 52 are used in a cooling tower 100 that aerates and cools process wastewater 5 such as hot spring water containing a solid component 1. In the cooling tower 100, the process wastewater 5 is stored in the upper water tank 10 while securing a predetermined water level J. The watering nozzle 20 extends downward from the drainage port 12 formed in the bottom plate 11 of the upper water tank 10.

The process wastewater 5 is sprinkled from below the watering nozzle 20. The drainage port 12 to which the inlet flange 28 forming the upper end of the watering nozzle 20 is fitted is covered with the watering nozzle strainers 50, 51, 52 made of a mesh filter medium. The strainers 50, 51, and 52 prevent clogging of the watering nozzle 20 caused by the scale 2 in which the solid component 1 of the process wastewater 5 is aggregated into agglomerates.

The solid component 1 in the hot spring water easily forms the scale 2. The scale 2 easily adheres to the piping transferred to the cooling tower 100. The scale 2 adhered in this way is easily peeled off by water flow or vibration. Considering this, the strainers 50, 51, 52 are particularly suitable when the process wastewater 5 is hot spring water, and exert a remarkable effect.

The strainers 50, 51, and 52 can easily provide a wire mesh (watering nozzle strainer) suitable for the idea of "covering a position higher than the operating water level J with the surrounding nets 31, 32, 33" from a commercially available product. I couldn't find it. Therefore, there is a history that the worker himself completed the invention by processing the material. Hereinafter, as an example, a method for manufacturing the dome-shaped strainer 52 will be described.

The manufacturing method of the strainer 52 (hereinafter, also referred to as “the method”) can be applied to mass production by a specific mold press, but is not limited thereto, and is rather suitable for manual work by pliers or the like. That is, in this method, the strainer 52 can be easily and inexpensively procured by forming the central portion of a commercially available metal net into a dome shape by using a general tool such as nippers or needle-nose pliers. ..

The strainer 52 is made of a net-like filter medium made of a commercially available metal net. In this net-like filter medium, a metal net having a mesh size of 3 to 10 mm is cut into an area having a diameter E of 180 mm (150 mm or more) so as to secure a circular plane F, and made into one piece. If a metal net of the size equivalent to one is available, it is recommended to use it.

Considering the efficiency of material removal and the ease of processing, as shown as an example in FIG. 2 (A), a metal net having a wire diameter of K = 1 mm and a mesh size of G = 9 mm has a side of 180 mm and its 1 If you cut it into squares with 18 sides, you will get good results in terms of ease of making. As long as the circular plane F having a diameter E = 180 mm is included as described above, the shape of the outer edge may be rectangular or rectangular.

The 180 mm square horizontal metal net prepared in this way is pre-processed with nippers so as to increase the degree of freedom of the portion deformed by the subsequent bending process. For example, as shown in FIG. 3, when the metal net is undulated from a flat state to a dome shape, the wire drawn from the surroundings to make up for the lack of length may be entangled with the edge or the like. , Cut it and free it. The time required is about 5 minutes.

In particular, the strainer 52 shown as an example in FIG. 3 is formed by processing the central portion of the metal net into a dome shape. At this time, the peripheral portion 34 forming the bottom portion of the dome shape is bent so that the diameter M is 82 mm and the height H of the central top portion P is 50 mm. Further, the entire strainer 52 is formed by horizontally extending the flange portion 35 on the peripheral edge portion 34 of the dome shape.

Here, a metal net may be bent into a dome shape using a male mold (not shown). For example, a baseball hard ball having a diameter of 73 mm, a softball (No. 1 ball) having a diameter of 85 mm for elementary school students and lower grades, other ready-made spheres, or a special dome-shaped wooden pattern may be prepared. While pressing a metal net having a size corresponding to one of the above-mentioned pre-processed molds against these male molds, the wire is processed so as to be bent with radio pliers (about 17 minutes).

Further, the peripheral portion 34 may be shaped by hitting it with a mallet while aligning the tip of the needle-nose pliers with the bent wire. At that time, the base portion is also hit with a mallet to form the collar portion 35 substantially flat (about 3 minutes). In this way, the strainer 52 can be manufactured by a simple production process. The collar portion 35 may be formed in consideration of making it function like a dustpan when removing the scale 2 deposited therein.

The strainer 52 is not limited to the dimensions of each part shown in FIGS. 2 and 3, and the set water level (water level J value) of the process wastewater 5 stored in the operating upper water tank 10 and the upper water tank 10 The optimum value is determined by the inner diameter of the drainage port 12 that opens to the bottom plate 11 and the watering nozzle 20 that communicates with the drainage port 12. The optimum value is similarly determined not only for the dome-shaped main strainer 52 but also for the conical main strainer 50 and the cylindrical main strainer 51.

Further, the shape of the strainers 50, 51, 52 is comprehensively determined by the water quality of the process wastewater 5, that is, the composition and content of the solid component 1, the frequency of the removal work of the accumulated scale 2, and the like. For example, when the operating water level J = 30 mm, the strainer 52 is preferably set from a range in which the diameter of the peripheral portion 34 is M = 40 to 120 mm and the height of the central top portion P is H = 30 to 70 mm.

<Comparison between Examples and Comparative Examples>
Under the common conditions shown below, the effects of the present invention will be clarified by comparing Examples and Comparative Examples.
The content ratio of the solid component 1 contained in the hot spring water, which is mostly process wastewater 5, is 0.0001 g / liter. The rationale is as follows.

Hot spring water is about 60,000m ³ is drained in one week. For the amount of drainage, scale 2 for one bag of scale sandbags (about 6 kg) is captured during cleaning performed once a week. This scale 2 is an agglomerate of solid components 1. Therefore, the amount of scale contained / the total amount of drainage of hot spring water = 6,000 g / 60,000,000 liters ≈ 0.0001 g / liter.

The total amount of waste water of hot spring water is about 60,000m ^3/1 week = about 6.0m ³ / min. The process wastewater 5 of 7.3 m ³ / min including hot spring water having a total drainage of about 6.0 m ³ / min is aerated and cooled by the No. 3 cooling tower 100. The total number of watering nozzles 20 arranged in the No. 3 cooling tower 100 is 120, and the process wastewater 5 of 7.3 m ³ / min is dispersed and sprinkled in these 120 watering nozzles 20. Since the total amount of water sprinkled in the No. 3 cooling tower 100 is 7.3 m ³ / min = 7,300 liters / min, the amount of water sprinkled by one watering nozzle 20 is 7,300 liters / 120 = 60.8 liters / min. is there.

When the cooling tower 100 was operated using the strainer 52, no increase in the water level J in the upper water tank 10 was observed. As a result, it is sufficient for one person to spend 40 minutes once a week to remove the scale 2 accumulated around the strainer 52, including the inspection. It was confirmed that it is sufficient for one person to perform the work for 40 minutes at a time once a week (1 person x 40 minutes x 1 time = 40 minutes). Due to the labor saving effect of the strainer 52, it is reduced to about one-sixth as compared with the case where it is not used (Comparative Example 2 described later). In Comparative Example 2, it was necessary for one person to continue the work for 60 minutes at a high frequency of 4 times a week (1 person x 60 minutes x 4 times = 240 minutes).

Comparative Example 1

5A and 5B are views for explaining a watering nozzle that does not use the strainer, FIG. 5A shows a front sectional view in a used state, and FIG. 5B shows a perspective view of a single unit. As shown in FIG. 5A, in Comparative Example 1, the strainers 50, 51, 52 and the known strainers for watering nozzles are continuously monitored while monitoring the cooling tower 100 without using any of the strainers. It was in operation.

As a result, the scale 2 flows into the main body pipe portion 29 of the watering nozzle 20 to block it and flows into the nozzle 20 when 24 hours have passed since the scale 2 was not deposited on the drain port 12. The amount of water in the process wastewater 5 was significantly reduced.

On the other hand, since the supply amount of the process wastewater 5 supplied to the upper water tank 10 by the pump (not shown) is unchanged, the water storage amount of the upper water tank 10 gradually increases, and the water level J starts to rise and rises to a maximum of 150 mm. .. On the other hand, since the upper water tank 10 has an allowable range of the water level J, that is, an overflow depth of 200 mm, if the process wastewater 5 exceeds it, it overflows and causes troubles in each part, so the operation was stopped before that.

In order to avoid the blockage, it is necessary to remove the scale 2. To that extent, it was necessary for two people to continue the work for 60 minutes at a high frequency of four times a week (2 people x 60 minutes x 4 times = 480 minutes). It was confirmed that the effort was converted into one person and spent eight hours every week.

Comparative Example 2

FIG. 6 is a front sectional view showing a usage state of the flat wire mesh strainer according to the comparative example. As shown in FIG. 6, the flat wire mesh strainer 60 has a height H = 0 from the bottom plate 11 of the upper water tank 10. Instead of the main strainers 50, 51, 52, the flat wire mesh strainer 60 was placed flat so as to cover the drain port 12, and the cooling tower 100 was operated.

As a result, the scale 2 not only covered the flat wire mesh strainer 60, but also accumulated around the scale 2 to block the drainage port 12, and reduced the amount of the process wastewater 5 flowing into the nozzle 20. On the other hand, since the supply amount of the process wastewater 5 supplied to the upper water tank 10 by the pump (not shown) is unchanged, the water storage amount of the upper water tank 10 increases and the water level J gradually rises.

When two days have passed since the scale 2 was not accumulated in the flat wire mesh strainer 60 at the beginning of the operation, the water level J of the upper water tank 10 exceeded the allowable range (200 mm), and the operation was forced to be stopped. It was. In order to avoid this, it is necessary to perform cleaning work four times a week, which requires 60 minutes for one person to perform one work. In other words, it was confirmed that one person spends four hours every week.

Comparative Example 3

FIG. 7 is a front sectional view showing a usage state of the submerged dish-shaped wire mesh strainer according to the comparative example. As shown in FIG. 7, the dish-shaped wire mesh strainer 61 has a height H from the bottom plate 11 of the upper water tank 10 of less than 30 mm (H <J). The cooling tower 100 was operated by placing the dish-shaped wire mesh strainer 61 so as to cover the drain port 12 instead of the strainers 50, 51, 52.

As a result, the water level J of the upper water tank 10 exceeded the permissible range when three days had passed since the scale 2 was not accumulated in the dish-shaped wire mesh strainer 61 at the beginning of the operation, and the operation had to be stopped. Was done. In order to avoid this, as in Comparative Example 2, a cleaning work that requires 60 minutes for one person to perform one work is required four times a week. In other words, it was confirmed that one person spends four hours every week.

As confirmed in Comparative Examples 1 to 3, the strainers 50, 51, and 52 are not applied, and the height is not suitable even if the flat wire mesh strainer 60 shown in FIG. 6 or the three-dimensional one shown in FIG. 7 is formed. When a strainer 61 that is sufficient and is submerged in the process wastewater 5 stored in the upper water tank 10 is used, the inflow of the process wastewater 5 is hindered by a large amount of scale 2 accumulated around the drain port 12. As a result, in the cases of Comparative Examples 1 to 3, even if the watering nozzle 20 can be prevented from being blocked, the operation cannot be continued satisfactorily.

The present invention prevents blockage of the watering nozzle in a cooling tower of a type in which process wastewater mainly containing hot spring water stored in the upper water tank is sprinkled from the drainage port at the bottom of the water tank to the lower part via a watering nozzle to cool the water. May be adopted as a strainer for watering nozzles. If it is adopted, the labor of cleaning can be saved and it becomes easy to continue the operation well, so its industrial value is great.

Although each embodiment and each embodiment of the present invention have been described in detail as described above, those skilled in the art will appreciate that many modifications that do not substantially deviate from the novel matters and effects of the present invention are possible. , Will be easy to understand. Therefore, all such modifications are included in the scope of the present invention.

For example, a term described at least once in a specification or drawing with a different term in a broader or synonymous manner may be replaced by that different term anywhere in the specification or drawing. Further, the configuration of the strainer for the watering nozzle and the method for manufacturing the strainer are not limited to those described in each embodiment and each embodiment of the present invention, and various modifications can be carried out.

1 Solid component, 2 scale, 5 process wastewater, 10 upper water tank, 11 bottom plate (of upper water tank 10), 12 drainage port, 20 watering nozzle, 21,22 watering plate, 28 inlet flange, 29 main body pipe, 31, 32 , 33 Siege, 34 (forming below siege 31, 32, 33), 35 flange, 37 (of siege 31, 32, 33), 50, 51, 52, 60, 61 Watering nozzle strainer (this strainer), 100 cooling tower, D (drainage port 12) diameter, E (circular plane F) diameter, F circular plane, G opening, H (siege nets 31, 32, 33) height Now, J (process wastewater 5) water level, M (peripheral part 34) diameter, P center top

Claims (3)

A strainer for watering nozzles installed in a cooling tower that aerates and cools process wastewater containing solid components.
The cooling tower
An upper water tank in which the process wastewater is stored at a predetermined water level, and
A watering nozzle that can communicate downward from a drainage port drilled in the bottom plate of the upper water tank and can sprinkle water.
With
The drainage port is partitioned by a surrounding net formed larger than the diameter of the drainage port by a net-like filter medium having a predetermined opening extending above the predetermined water level to a height from the bottom plate.
The net-like filter medium is made of a metal net having a mesh size of 3 to 10 mm, and has a peripheral edge having a diameter of 40 to 120 mm and a height of 30 to 70 mm forming the lower part of the surrounding net.
A strainer for a watering nozzle in which a flange portion extends horizontally from the peripheral portion. The strainer for a watering nozzle according to claim 1, wherein the net-like filter medium has a dome shape that continuously covers the drain port from the peripheral edge portion to the upper portion of the surrounding net. The strainer for a watering nozzle according to claim 1 or 2, wherein the process wastewater is hot spring water.

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