Strainer Equipment

Abstract

To provide strainer facility that has a main-side strainer and a bypass-side strainer and that can enlarge backwash effect.SOLUTION: In a main-side strainer 20 having a bucket-shaped filter 26 arranged inside a casing, an industrial water supply pipe capable of supplying industrial water is connected directly or via a blow pipe (a drainage line 2e) to a bottom or to the vicinity of the bottom, a bent pipe (a bent line 2j) is connected to an upper part of the casing, and a collection cage 50 is connected to the bent pipe. The inside of the casing is provided with a vertical flow passage part and a horizontal flow passage part, and an inflow port is arranged in an upper part of the vertical flow passage part. An outflow port is arranged in an unblocked end part of the horizontal flow passage part. In a bypass side strainer 30 having a filtering filter 39 arranged in the horizontal flow passage part, a blow pipe (drainage line 3e) is connected to a blocked end part of the horizontal flow passage part which is a part as a lower side corner part or in its vicinity, with the collection cage 50 being connected to the blow pipe.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a strainer system provided downstream of a water intake for collecting solid matter in seawater, and in particular to a system equipped with a regular-use strainer and a bypass-use strainer that bypasses the regular-use strainer. [Background technology]

[0002] In power plants, etc., seawater is used as cooling water for the coolers. Seawater is taken in from the water intake using a circulation pump, but since seawater contains solid matter such as shellfish, the seawater is filtered in advance using a strainer to remove the solid matter before being supplied to the coolers.

[0003] 7, a typical strainer facility 1 has two systems: a regular system 2 in which a regular-use strainer 20 is disposed, and a bypass system 3 in which a bypass-side strainer 30 is disposed which bypasses the regular-use strainer 20. Each system is equipped with strainers 20, 30, inlet lines 2a, 3a, outlet lines 2b, 3b, and drainage lines 2e, 3e. Seawater is introduced into each of the inlet lines 2a, 3a from a raw water line 4, and each of the outlet lines 2b, 3b is joined and led to a cooler via a filtered water line 5. In the normal system, the inlet line 2a is opened and closed by the normal inlet valve 2c, the outlet line 2b is opened and closed by the normal outlet valve 2d, and the drain line 2e is opened and closed by the normal blow valve 2f. In the bypass system, the inlet line 3a is opened and closed by the bypass inlet valve 3c, the outlet line 3b is opened and closed by the bypass outlet valve 3d, and the drain line 3e is opened and closed by the bypass blow valve 3f. Furthermore, the filtrate line 5 is opened and closed by the filtrate valve 5a.

[0004] Such a strainer equipment 1 normally uses only the regular line 2, but after a certain period of operation, solid matter such as shellfish accumulates in the regular strainer 20, increasing pressure loss. Therefore, the regular line 2 is temporarily stopped to remove the solid matter accumulated in the regular strainer 20, and the bypass line 3 is used to ensure a continuous supply of filtered water. Also, in order to clean the regular strainer 20, a portion of the filtered water generated in the bypass line 3 is supplied to the regular strainer 20 for backwashing. The filtered water used for backwashing is discharged outside the system via the drain line 2e of the regular line 2. In addition, when removing solid matter accumulated in the bypass side strainer 30, the same procedure is followed, in which a portion of the filtered water produced in the regular system 2 is supplied to the bypass side strainer 30 for backwashing (see Patent Document 1). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2011-140010 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, even when such a strainer system 1 is used to backwash the strainers 20, 30, there are cases in which the solid matter trapped in the strainers cannot be sufficiently removed. For example, as shown in FIG. 8, the normal-use strainer 20 is provided on the side of a housing 23 with an inlet 24 through which seawater introduced from the water intake flows in and an outlet 25 through which filtered seawater is sent to the outlet line 2b, and a bucket-shaped filter 26 is housed inside the housing 23 so as to block the space between the inlet 24 and the outlet 25, with an open upper end and extending downward from the inlet 24 and the outlet 25. In this configuration, a blow pipe 27 opened and closed by a blow valve 2f is connected to the bottom of the housing 23, and a vent pipe 29 opened and closed by a vent valve 2k for venting air is connected to the top of the housing 23. In this configuration, even if the normal-use inlet valve 2c is closed, the normal-use outlet valve 2d is opened, and the normal-use blow valve 2f is opened during backwashing, and backwash water is supplied to the normal-use strainer 20 through the outlet 25, the filter is bucket-shaped, so that the solid matter accumulated in the bucket-shaped filter 26 cannot be discharged. Therefore, it is conceivable that during backwashing, the regular side blow valve is closed, the vent valve 2k of the vent piping 29 provided at the top of the housing 23 is opened, and the supplied backwashing water is discharged from the vent piping 29 to wash the inside of the bucket-shaped filter, but since the backwashing water supplied from the outlet does not pass through the bottom or inlet of the bucket-shaped filter, but changes direction and is led directly upward to the vent piping, the solid matter accumulated at the bottom of the bucket-shaped filter 26 cannot be floated up and collected, and the solid matter accumulated near the inlet is also difficult to collect, resulting in a small backwashing effect. Also, the conventional vent piping 29 is originally provided for the purpose of venting air, and does not have the function of collecting solid matter.

[0007] In addition, as shown in FIG. 9, the bypass side strainer 30 is formed by a housing 34 made of a horizontal body 31 and a vertical body 32 connected thereto, an inlet 37 is provided at the upper end of the vertical body 32 for the inflow of seawater introduced from the water intake, and an outlet 38 is provided at one end of the horizontal body (the side of the housing 34 located below the inlet 37) for sending filtered seawater to the outlet line 2b. The inside of the housing 34 is formed into a substantially L-shaped flow path, and a filtration filter 39 is placed inside the horizontal body 31 facing the outlet 38. In this configuration, backwashing cannot be performed if a drainage line is not provided, so the only way to do this is to open the lid 33 provided at the end of the horizontal body 31 opposite the outlet 38 and manually scrape out solid matter such as shellfish caught in front of the filtration filter 39 from the system. Therefore, as shown in Patent Document 1, it is desirable to provide a drain line; however, in a strainer having an L-shaped flow path, when backwash water is supplied from the outlet 38, solid matter tends to collect in the corners at the bottom of the flow path (corners closed by the cover 33 of the horizontal body 31), and there is a concern that the backwash effect may not be sufficient with a conventional configuration in which a drain line (blow piping) is provided at the bottom of the horizontal body 31. Furthermore, even if a drainage line is provided in the bypass system, if a collection basket for solids and the like is provided for each system, the collection basket for solids will be different for each system, so care must be taken not to mistake the collection basket when disposing of the collected solids, and there is also the inconvenience of having a large number of components.

[0008] The present invention has been made in view of the above circumstances, and has as its main object to provide a strainer system having a normal-use strainer and a bypass-use strainer, capable of increasing the backwash effect. In addition, even when constructing such a strainer system, it is also an object of the present invention to improve workability and avoid an increase in the number of components by enabling the collection of solids in the same place in each system. [Means for solving the problem]

[0009] In order to achieve the above object, the strainer equipment according to the present invention includes a normal-use strainer provided downstream of a water intake for collecting solid matter in seawater taken in through the water intake, and a bypass-use strainer for bypassing the normal-use strainer and collecting the solid matter, The normal system in which the normal strainer is provided includes a normal inlet valve provided on the inlet side of the normal strainer, and a normal outlet valve provided on the outlet side of the normal strainer, the bypass system in which the bypass-side strainer is provided includes a bypass-side inlet valve provided on an inlet side of the bypass-side strainer and a bypass-side outlet valve provided on an outlet side of the bypass-side strainer, A strainer system for sending the filtered water flowing out through the normal-use outlet valve and the bypass-use outlet valve to a downstream side through a common filtered water system, The normal-use strainer is provided on the side of a housing with an inlet through which seawater introduced from the intake flows in and an outlet through which filtered seawater flows out to the filtered water system, a blow pipe that is opened and closed by a blow valve is connected to the bottom of the housing or in the vicinity thereof, and a vent pipe that is opened and closed by a vent valve is connected to the top of the housing, A bucket-shaped filter is accommodated inside the housing so as to block the space between the inlet and the outlet, the bucket-shaped filter having an open upper end and being disposed below the inlet and the outlet, An industrial water supply pipe capable of supplying industrial water is connected directly or via the blow pipe to the bottom or near the bottom of the regular side strainer, A collecting cage is connected to the vent pipe.

[0010] In this configuration, when backwashing the regular-use strainer, industrial water is supplied from the bottom of the regular-use strainer or its vicinity into the inside of the housing via the industrial water supply pipe, which creates a flow from the bottom of the housing upwards, causing shellfish and the like in the bucket-shaped filter to float up and be discharged from the vent pipe. This makes it possible to effectively collect shellfish and the like in the bucket-shaped filter in the collection basket.

[0011] The strainer equipment according to the present invention includes a regular-use strainer provided downstream of a water intake and configured to collect solid matter in seawater taken in through the water intake, and a bypass-use strainer that bypasses the regular-use strainer and collects the solid matter, The normal system in which the normal strainer is provided includes a normal inlet valve provided on the inlet side of the normal strainer, and a normal outlet valve provided on the outlet side of the normal strainer, the bypass system in which the bypass-side strainer is provided includes a bypass-side inlet valve provided on an inlet side of the bypass-side strainer and a bypass-side outlet valve provided on an outlet side of the bypass-side strainer, A strainer system for sending the filtered water flowing out through the normal-use outlet valve and the bypass-use outlet valve to a downstream side through a common filtered water system, the bypass-side strainer includes a vertical flow path section extending in a substantially vertical direction inside a housing, and a horizontal flow path section connected to a lower end of the vertical flow path section and extending in a substantially horizontal direction, one end of the horizontal flow path section being closed, an inlet connected to an upper portion of the vertical flow path section at an upper end of the housing and for introducing seawater introduced from the water intake port, an outlet connected to the other end of the horizontal flow path section at a side of the housing and for discharging filtered seawater into the filtered water system, and a filtration filter for blocking the horizontal flow path section is disposed at a portion of the horizontal flow path section facing the outlet, A blow pipe opened and closed by a blow valve is connected to one end of the horizontal flow path section, which is a lower corner portion or in the vicinity thereof, and a collecting cage is connected to this blow pipe.

[0012] Therefore, when backwashing the bypass side strainer, if backwash water is supplied from one end of the horizontal flow path, the shellfish etc. captured by the filtration filter tend to gather in the lower corner of the other end of the horizontal flow path that is closer to the vertical flow path, but because a blow pipe that is opened and closed by a blow valve is connected to the lower corner of the other end closed by the lid of the horizontal flow path or in its vicinity, it is possible to discharge the shellfish etc. from the blow pipe by opening the blow valve. This makes it possible to effectively capture the shellfish etc. inside the housing in the collection basket.

[0013] The above configuration of the regular strainer and the bypass strainer are as follows: It is advisable to use them in combination. That is, the strainer according to the present invention equipment of, The system comprises a regular-use strainer provided downstream of the intake port for collecting solid matter in seawater taken in through the intake port, and a bypass-use strainer for bypassing the regular-use strainer and collecting the solid matter, The normal system in which the normal strainer is provided includes a normal inlet valve provided on the inlet side of the normal strainer, and a normal outlet valve provided on the outlet side of the normal strainer, the bypass system in which the bypass-side strainer is provided includes a bypass-side inlet valve provided on an inlet side of the bypass-side strainer and a bypass-side outlet valve provided on an outlet side of the bypass-side strainer, A strainer system for sending the filtered water flowing out through the normal-use outlet valve and the bypass-use outlet valve to a downstream side through a common filtered water system, The regular-use strainer is provided on a side of a housing with an inlet for receiving seawater introduced from the intake port and an outlet for discharging filtered seawater to the filtered water system. At the bottom of the housing A blow pipe that is opened and closed by a blow valve is connected to the housing, and a vent pipe that is opened and closed by a vent valve is connected to the upper part of the housing, A bucket-shaped filter is accommodated inside the housing so as to block the space between the inlet and the outlet, the bucket-shaped filter having an open upper end and being disposed below the inlet and the outlet, The above At the bottom of the strainer on the regular side an industrial water supply pipe capable of supplying industrial water is connected directly or via the blow pipe; A collecting cage is connected to the vent pipe; the bypass-side strainer includes a vertical flow path section extending in a substantially vertical direction inside a housing, and a horizontal flow path section connected to a lower end of the vertical flow path section and extending in a substantially horizontal direction, one end of the horizontal flow path section being closed, an inlet connected to an upper portion of the vertical flow path section at an upper end of the housing and for introducing seawater introduced from the water intake port, an outlet connected to the other end of the horizontal flow path section at a side of the housing and for discharging filtered seawater into the filtered water system, and a filtration filter for blocking the horizontal flow path section is disposed at a portion of the horizontal flow path section facing the outlet, The one end of the horizontal flow path portion, In the part that will become the lower corner A blow pipe that is opened and closed by a blow valve is connected to the blow pipe, and a collecting cage is connected to the blow pipe. It is recommended to do so.

[0014] The collecting cage connected to the vent pipe provided on the service side strainer and the collecting cage connected to the blow pipe provided on the bypass side strainer may preferably share the same collecting cage. With such a configuration, there is no need to provide separate collection baskets for each system, and solid matter such as shellfish can be collected at the same location regardless of the system. This means that there is no risk of using the wrong collection basket when disposing of collected solid matter, improving operability and eliminating the inconvenience of having a large number of components in the strainer equipment. Effect of the Invention

[0015] As described above, according to the present invention, in a strainer system having a service side strainer and a bypass side strainer, it is possible to increase the backwash effect of the strainer. In addition, by sharing a collection basket for collecting solid matter such as shellfish when backwashing each strainer, it is possible to collect solid matter at the same location regardless of the system, improving workability and avoiding an increase in the number of components. [Brief description of the drawings]

[0016] [Figure 1] FIG. 1 is a schematic diagram of a strainer system according to the present invention. [Diagram 2] FIG. 2(a) is a diagram showing an example of the configuration of a regular-use strainer according to the present invention, and FIG. 2(b) is a diagram showing a state in which the regular-use strainer is backwashed. [Diagram 3] FIG. 3(a) is a diagram showing an example of the configuration of a bypass side strainer according to the present invention, and FIG. 3(b) is a diagram showing a state in which the bypass side strainer is backwashed. [Figure 4] FIG. 4 is a table showing an example of the operation of each valve of the strainer equipment of the present invention. [Diagram 5] FIG. 5(a) is a system diagram showing the flow of seawater when it is filtered by the regular side strainer of the strainer equipment of the present invention, and FIG. 5(b) is a system diagram showing the flow of seawater when the regular side strainer is backwashed. [Figure 6] FIG. 6(a) is a system diagram showing the flow of seawater when it is filtered by the bypass side strainer of the strainer equipment according to the present invention, and FIG. 6(b) is a system diagram showing the flow of seawater when the bypass side strainer is backwashed. [Figure 7] FIG. 7 is a system diagram showing a conventional strainer system. [Figure 8] FIG. 8(a) is a diagram showing the configuration of a conventional service-side strainer, and FIG. 8(b) is a diagram showing a state in which the conventional service-side strainer is backwashed. [Figure 9] FIG. 9(a) is a diagram showing the configuration of a conventional bypass side strainer, and FIG. 9(b) is a diagram showing a state in which the conventional bypass side strainer is being washed. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0018] An example of a schematic system of a strainer system 1 according to the present invention is shown in Fig. 1. In this example, the strainer system 1 is supplied with seawater introduced from a water intake port via a pump (not shown), collects solid matter such as shellfish in the seawater, and supplies seawater filtered by the strainer system to a cooler.

[0019] The strainer equipment 1 is composed of two systems: a normal system 2 equipped with a normal-use strainer 20 used under normal circumstances, and a bypass system 3 equipped with a bypass-side strainer 30 used when operation is stopped for cleaning of the normal-use strainer, etc.

[0020] The normal use system 2 has an inlet line 2a provided on the inlet side of the normal use strainer 20 to which seawater introduced from a water intake port by a pump (not shown) on the raw water line 4 is supplied, and an outlet line 2b provided on the outlet side of the normal use strainer 20 to deliver seawater filtered by this strainer. The inlet line 2a is provided with a normal use inlet valve 2c for opening and closing this line, and the outlet line 2b is provided with a normal use outlet valve 2d for opening and closing this line.

[0021] The bypass system 3 has an inlet line 3a provided on the inlet side of the bypass side strainer 30 to which seawater introduced by the pump on the raw water line 4 is supplied, and an outlet line 3b provided on the outlet side of the bypass side strainer 30 to send out seawater filtered by this strainer, with a bypass side inlet valve 3c provided on the inlet line 3a and a bypass side outlet valve 3d provided on the outlet line 3b. The outlet lines 2b and 3b of each system are merged into a filtrate water line 5, and the filtered seawater (filtrate) is guided to the cooler via this filtrate water line 5. The filtrate water line 5 is opened and closed by a filtrate water valve 5a.

[0022] The regular system is also provided with a drain line 2e for discharging seawater from the regular strainer 20, and a vent line 2j for discharging solid matter captured in the regular strainer during backwashing.

[0023] The drainage line 2e is provided with a first blower valve 2f and a second blower valve 2g disposed downstream of the first blower valve 2f, and an industrial water supply line 2h capable of supplying industrial water (industrial water) is connected between these blower valves. This industrial water supply line 2h is opened and closed by an industrial water supply valve 2i.

[0024] The vent line 2j is a line for discharging air bubbles in the vent-side strainer and discharging solid matter captured in the service-side strainer 20 together with seawater, and is connected to a collecting cage 50 for collecting the discharged solid matter. The vent line 2j is opened and closed by a vent valve 2k.

[0025] The bypass system is provided with a discharge line 3e for discharging seawater from the bypass-side strainer 30 and discharging solid matter during backwashing. The discharge line 3e is connected to the collecting cage 50 and is opened and closed by a blow valve 3f.

[0026] The shellfish and other solid matter discharged from each strainer is supplied to the collection cage together with seawater, and after being collected in the collection cage 50, is removed from the collection cage and discarded. The seawater guided to the collection cage 50 is discharged outside the system after the solid matter is removed there.

[0027] In such strainer equipment, the normal-use strainer 20, as shown in Figure 2(a), has a housing 23 composed of a body 21 formed into a cylindrical shape with a bottom, and a cover 22 that closes the upper opening of the body 21, and on the side (circumferential surface) of this housing 23, an inlet 24 through which seawater introduced from the water intake via the inlet line 2a flows in, and an outlet 25 through which filtered seawater is sent to the outlet line 2b are provided, shifted in phase by, for example, 180 degrees. A bottomed, cylindrical bucket-shaped filter 26 with an open upper end is disposed inside the housing 23. This bucket-shaped filter 26 is provided so as to block the space between the inlet 24 and the outlet 25, and allows all of the seawater flowing in from the inlet 24 to pass through. An opening 26a at the upper end is formed at an angle so as to face the inlet 24, making it easier to capture solid matter in the seawater inside the bucket-shaped filter 26.

[0028] In addition, a blow pipe 27 constituting a drainage line is connected to the bottom of the housing 23 (body 21) or in the vicinity thereof. An industrial water supply pipe 28 constituting an industrial water supply line capable of supplying industrial water is connected to the middle of the blow pipe 27, and the industrial water supply pipe 28 is opened and closed by an industrial water supply valve 2i. A first blow valve 2f is provided between the connection part of the blow pipe 27 with the industrial water supply pipe 28 and the housing 23, and a second blow valve 2g is provided between the connection part with the industrial water supply pipe 28 and the open end. By closing the industrial water supply valve 2i and opening the first and second blow valves 2f and 2g, the seawater inside the normal-use strainer 20 can be discharged to the outside of the system, and by closing the second blow valve 2g and opening the industrial water supply valve 2i and the first blow valve 2f, the industrial water can be introduced into the housing from the bottom of the housing 23 (body 21) or in the vicinity thereof via the blow pipe 27.

[0029] Furthermore, a vent pipe 29 constituting a vent line 2j that is opened and closed by a vent valve 2k is connected to the upper end (lid 22) of the housing 23. The vent pipe 29 is formed with a diameter (e.g., 100A) large enough to discharge the solid matter captured by the regular-side strainer 20. The solid matter discharged from the vent pipe 29 is guided to the collecting basket 50.

[0030] In the above example, the industrial water supply pipe 28 is connected to the bottom or near the bottom of the regular side strainer 20 via the blow piping 27, but the industrial water supply pipe 28 may be connected directly to the bottom or near the bottom of the regular side strainer 20 (housing 23).

[0031] On the other hand, as shown in Fig. 3(a), the bypass-side strainer 30 includes a horizontal body 31 with both ends open and a vertical body 32 connected to the horizontal body 31 substantially perpendicularly, and has a substantially L-shaped housing 34 with one open end of the horizontal body 31 closed by a cover 33. Inside the housing 34, a substantially L-shaped flow path is formed, which includes a vertical flow path section 35 extending substantially vertically and a horizontal flow path section 36 connected to the lower end of the vertical flow path section 35 and extending substantially horizontally. An inlet 37 is formed at the upper end of the housing 34, i.e., at the top of the vertical body 32 (vertical flow path section 35), through which seawater introduced from the water intake flows in, and an outlet 38 is formed at the end of the horizontal body 31 (horizontal flow path section 36) of the housing 34 opposite to the side closed by the cover 33, through which the filtered seawater is sent to the outlet line 3b. And, just before the outlet 38 of the horizontal flow path, a filtration filter 39 that blocks this horizontal flow path is disposed obliquely so that its lower end is located upstream of its upper end.

[0032] One end of a blow pipe 40 constituting the drainage line 3e opened and closed by a blow valve 3f is connected to or near the lower corner of the horizontal flow path 36, which is the end closed by the lid 33 near the vertical flow path 35. The other end of the blow pipe 40 is connected to the collecting cage 50.

[0033] In the above configuration, when the normal side strainer is operated normally, as shown in FIG. 4, the normal side inlet valve 2c is open, the normal side outlet valve 2d is open, the first blow valve 2f is closed, the second blow valve 2g is closed, the industrial water supply valve 2i is closed, the vent valve 2k is open (when bleeding air) or closed, the bypass side inlet valve 3c is closed, the bypass side outlet valve 3d is closed, the bypass side blow valve 3f is closed, and the filtered water valve 5a is open.

[0034] 5(a), seawater introduced from the water intake is introduced into the housing from the inlet 24 of the regular-use strainer, passes through the bucket-shaped filter 26, and then flows out from the outlet 25 and is guided to the cooler. Therefore, solid matter mixed in the seawater is captured by the bucket-shaped filter 26.

[0035] After a certain period of time has passed, solid matter accumulates near the inlet and inside the bucket-shaped filter 26 (particularly at the bottom), making it necessary to remove these solid matter. Therefore, the solid matter captured in the regular-use strainer 20 is discharged by backwashing. In this case, as shown in FIG. 4, the normal side inlet valve 2c is closed, the normal side outlet valve 2d is open, the first blower valve 2f is open, the second blower valve 2g is closed, the industrial water supply valve 2i is open, the vent valve 2k is open, the bypass side inlet valve 3c is open, the bypass side outlet valve 3d is open, the bypass side blower valve 3f is closed, and the filtered water valve 5a is open.

[0036] Then, as shown in Figure 5 (b), a portion of the seawater filtered by the bypass side strainer 30 is supplied into the housing from the outlet 25 of the regular side strainer 20 via the bypass side outlet valve 3d and the regular side outlet valve 2d, and this backwash water forms a flow inside the regular side strainer 20 toward the vent piping 29. However, since this backwash water turns upward immediately after flowing into the housing and is guided to the vent piping 29, this backwash water alone cannot effectively guide the solids captured at the bottom of the bucket-shaped filter 26 or the solids accumulated near the inlet to the vent piping 29.

[0037] However, during backwashing, industrial water supplied from the industrial water supply pipe 28 is introduced into the housing 23 from the bottom of the housing 23 or its vicinity via the blow pipe 27, so that, as shown in Fig. 2(b), the solid matter accumulated in the lower part of the bucket-shaped filter 26 is floated by this industrial water, and the floated solid matter can be guided to the vent pipe 29 in combination with the flow of the backwash water. In addition, the industrial water flowing upward from the lower part of the housing can effectively clean the vicinity of the inlet. Therefore, solid matter captured in the bucket-shaped filter 26 (not only solid matter near the outlet but also solid matter at the bottom and near the inlet) can be effectively collected in the collecting basket 50 via the vent piping 29.

[0038] In the above example, the industrial water is supplied simultaneously with the backwash water, but the backwash water and the industrial water may be supplied alternately to guide the solid matter captured in the bucket-shaped filter 26 to the vent pipe 29.

[0039] Next, to temporarily stop use of the normal side strainer and use the bypass side strainer, as shown in FIG. 4, close the normal side inlet valve 2c, close the normal side outlet valve 2d, close the first blow valve 2f, close the second blow valve 2g, close the industrial water supply valve 2i, open (when bleeding air) or close the vent valve 2k, open the bypass side inlet valve 3c, open the bypass side outlet valve 3d, open the bypass side blow valve 3f, and open the filtered water valve 5a.

[0040] Then, as shown in Fig. 6(a), seawater introduced from the water intake is introduced into the housing from inlet 37 of bypass side strainer 30, passes through filtration filter 39, and then flows out from outlet 38 and is led to the cooler. Therefore, solid matter mixed in the seawater is captured by filtration filter 39 and accumulates in front of this filtration filter 39, as shown in Fig. 3(a).

[0041] Furthermore, when discharging solids captured in the filtration filter 39 of the bypass side strainer 30 by backwashing, as shown in FIG. 4, the normal side inlet valve 2c is opened, the normal side outlet valve 2d is opened, the first blow valve 2f is closed, the second blow valve 2g is closed, the industrial water supply valve 2i is closed, the vent valve 2k is opened (when bleeding air) or closed, the bypass side inlet valve 3c is closed, the bypass side outlet valve 3d is opened, the bypass side blow valve 3f is opened, and the filtered water valve 5a is opened.

[0042] Then, as shown in FIG. 6(b), a portion of the seawater filtered by the normal side strainer 20 is supplied into the housing from the outlet 38 of the bypass side strainer 30 via the normal side outlet valve 2d and the bypass side outlet valve 3d, and this backwash water forms a flow inside the bypass side strainer 30 toward the blow piping 40.

[0043] For this reason, as shown in FIG. 3(b), the water pressure of the backwash water pushes the solids accumulated between the filtration filter 39 of the horizontal flow path section 36 of the bypass side strainer 30 and the cover body 33 toward the cover body 33, in particular toward the inner lower corners of the cover body 33 of the horizontal flow path section 36. However, since the bypass side strainer 30 is connected to the end portion close to the vertical flow path section 35 of the horizontal flow path section 36, which is the lower corner or in the vicinity thereof, the solids pushed toward the inner lower corners of the cover body 33 can be smoothly guided to the blow piping 40, and can be collected in the collecting cage 50 via this blow piping 40. Therefore, since the solid matter can be effectively discharged by backwashing, there is no need for cleaning work of removing the lid body 33 blocking the horizontal flow path section and scraping out the solid matter remaining inside the strainer, which makes it possible to reduce cleaning costs.

[0044] Furthermore, in the above-described configuration, the collecting basket 50 is shared by the regular side strainer 20 and the bypass side strainer 30, eliminating the need to provide a collecting basket for each strainer. This eliminates the inconvenience of using the wrong collecting basket when disposing of solid matter in the collecting basket, and also makes it possible to avoid an increase in the number of parts in the strainer equipment. [Explanation of symbols]

[0045] 1 Strainer equipment 2c Normal side inlet valve 2d Normal use outlet valve 3c Bypass side inlet valve 3d Bypass outlet valve 5a Filtered water valve 20 Regular side strainer 24 Inlet 25 Outlet 26 Bucket Filter 27 Blow piping 28 Industrial water supply pipe 29 Vent piping 30 Bypass side strainer 35 Vertical channel section 36 Horizontal flow path section 37 Inlet 38 Outlet 39 Filtration Filter 40 Blow pipe 50 Collection cage

Claims

1. The system comprises a regular-use strainer provided downstream of the intake port for collecting solid matter in seawater taken in through the intake port, and a bypass-use strainer for bypassing the regular-use strainer and collecting the solid matter, The normal system in which the normal strainer is provided includes a normal inlet valve provided on the inlet side of the normal strainer, and a normal outlet valve provided on the outlet side of the normal strainer, the bypass system in which the bypass-side strainer is provided includes a bypass-side inlet valve provided on an inlet side of the bypass-side strainer and a bypass-side outlet valve provided on an outlet side of the bypass-side strainer, A strainer system for sending the filtered water flowing out through the normal-use outlet valve and the bypass-use outlet valve to a downstream side through a common filtered water system, The normal-use strainer is provided on the side of a housing with an inlet for flowing in seawater introduced from the intake port and an outlet for flowing out filtered seawater to the filtered water system, a blow pipe that is opened and closed by a blow valve is connected to the bottom of the housing, and a vent pipe that is opened and closed by a vent valve is connected to the top of the housing, A bucket-shaped filter is accommodated inside the housing so as to block the space between the inlet and the outlet, the bucket-shaped filter having an open upper end and being disposed below the inlet and the outlet, A water supply pipe capable of supplying industrial water is connected to the bottom of the normal-use strainer directly or via the blow pipe; A collecting cage is connected to the vent pipe, and the bypass-side strainer includes a vertical flow path section extending in a substantially vertical direction inside a housing, and a horizontal flow path section connected to a lower end of the vertical flow path section and extending in a substantially horizontal direction, one end of the horizontal flow path section being closed, an inlet connected to an upper portion of the vertical flow path section at an upper end of the housing and for introducing seawater introduced from the water intake port, an outlet connected to the other end of the horizontal flow path section at a side of the housing and for discharging filtered seawater into the filtered water system, and a filtration filter for blocking the horizontal flow path section is disposed at a portion of the horizontal flow path section facing the outlet, A blow pipe opened and closed by a blow valve is connected to the one end of the horizontal flow path portion, which is a lower corner portion, and a collecting cage is connected to the blow pipe. The strainer equipment is characterized by the above.

2. 2. The strainer equipment according to claim 1, wherein the collecting cage provided in the vent pipe of the normal use side strainer and the collecting cage provided in the blow piping of the bypass side strainer share the same collecting cage.

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