KR870001153B1 - Backflow-type self-cleaning filter - Google Patents

Abstract

Self-cleaning filter for use in a cylindrical canduit carrying cooling water for a power plant comprises a sieve undulating between apstream and downstream planes. The conduit is divided into sectors bounded by sieve segments provided with peripheral outlets to a drain. The outlets are usually controlled by shut-off valves. During cleaning a flap valve closes the entrance to a segment and the shut-off valve is opened to allow reverse flow.

Description

Mechanical cleaning equipment for cooling water

1 is an axial sectional view of the device according to the invention with different sieve baskets on each of the left and right sides.

2 is a plan view of the apparatus of FIG.

3 shows a further device according to the invention of FIG. 1.

4 shows another device according to the invention corresponding to FIG. 1.

5 is a plan view of the apparatus according to the present disclosure with a plurality of independent sieve baskets.

6 is a sectional view along line A-A of FIG.

7 is a perspective view of the backflow flap in the apparatus of FIGS. 5 and 6;

8 is a bottom axial sectional view of the device according to the invention with four compartments and a backflow flap employed.

9 is a plan view of the apparatus of FIG.

10 is an axial cross-sectional view of a recent device of the present invention parallel to the axis of rotation of the flap system.

11 is a cross-sectional view taken along the line B-B of FIG.

12 is a view of another operating position corresponding to FIG.

FIG. 13 shows another operating position corresponding to FIG.

14 is a cross-sectional view taken along the line C-C of FIG.

The present invention relates to an apparatus for mechanical cleaning of the cooling water flow from a generator concentrating system, said apparatus comprising a cylindrical sieve housing, at least one sieve basket backflushing system having a longitudinal axis extending parallel to the housing axis. The sieve basket has a head and a sieve jacket and is attached to a support attached to the sieve housing by the sieve jacket, and is separated by a reverse flushing system having an outlet for discharging the deposit residue. do.

In a device of this type known (Hawker Siddeley Brackett Ltd, brochure, Ref, No. 2012, p. 3), the stream passes through the sieve housing transversely with respect to the axial direction of the sieve housing. The sieve basket therefore has a sieve jacket with an inlet side open, and a coolant stream enters the inlet side for cleaning. The head and the support are not designed like sheaves but are designed as plate-like sieves that form a housing. The reverse flushing system includes a suction box that extends inside the sieve jacket on the sieve basket and rotates the sieve basket jacket in the circumferential direction. A suction line with a suction pump is connected to the suction box. In a device similar to that described above (DE-OS 2237912), the suction box is fixed in place and the sealed cylindrical sieve basket is rotated in its axial direction so that the sieve basket jacket is fed past the suction box. Thus, the coolant strip enters the sieve basket from the bottom but transversely in the axial direction of the sieve housing and then again transversely. The prior art device of the type needed improvement because the sieve housing only accommodates a relatively low sieve area and generally the sieve housing should have a larger cross-sectional area than the conduit through which the coolant stream enters and exits. In addition, the sieve basket head and the supporting portion do not play a role in the mechanical cleaning of the cooling water strip, thereby increasing the inflow resistance. The reverse flushing equipment is expensive because, firstly, the relative movement between the sieve basket jacket and the suction box must be maintained, and secondly, proper debris suction through the suction box is only guaranteed by the installation of an expensive suction pump. In particular, the known sieve baskets have a small increase in the pressure cabin because of their low storage capacity to collect the debris that increases in the sieve basket before the inflow resistance. Due to the small storage capacity to collect the residues in the sieve jacket, the pressure loss is greatly increased. In collecting waste in the sieve jacket, the inflow resistance increases exponentially the amount of collected waste.

As can be seen above, the object of the present invention is to provide an improved device with a high capacity and a larger sieve area as described above to accommodate the sieve housing. Nevertheless, reverse flushing to discharge attached debris is provided by a simple means that excludes the relative movement between the sieve area and the suction box connected to the suction pump.

The stream according to the invention is introduced axially past the sieve housing, the sieve housing having at least one compartmentalizing separator starting in the upstream of the sieve basket and extending throughout the sieve basket in the inflow direction. At least one element forming the sink basket head and support is acted as a sieve, and the reverse flushing system has a discharge union upstream of each center of the sieve basket and support and at least one counterflow flap. The sectors are continuously sealed on the reverse flush upper stream surface when the discharge union connected to the is opened. Both the support and the sieve basket heads are preferably arranged transverse to the inflow direction, both of which are designed as sieves. Reverse flushing is performed periodically when debris accumulates. In the present invention, the term "sieve basket head" means a seal on the sieve jacket regardless of the outer surface of the sieve basket head or the inner surface of the sieve basket head surrounded by the sieve basket jacket facing the stream. In the present invention, the term "supporting part" means a part for supporting a sieve jacket provided in the sieve housing. Installation necessity may cause the separator to extend to the backflow flap or its top stream.

The present invention is directed to improving a sieve housing of a given size by applying a sieve basket head and / or support as a sieve in the device to increase the sieve area. The present invention takes advantage of the fact that the sieve jacket, the sieve basket head and the support can be cleaned by reverse flushing by means of relative movement or by simple means that do not contain the equipment of the suction box connected to the suction pump. The hydraulic pressure condition is the combination of the sector-forming zone (s) arranged as described above and the corresponding actuating actuation backflow flap (or series of backflow flaps) whereby the reverse flushing operation is performed directly or simultaneously. The above conditions (no need to maintain relative movement between the sieve section and the suction box for back flushing) will increase the sieve area corresponding to the sieve housing with a given size to be comparable to known devices. Can be. In addition, there is no restriction in the form of the sieve basket or the sieve jacket. In addition to this, an exemplary device of the present invention comprises a plurality of sieve jackets arranged centrifugally, the sink basket axis coinciding with the sieve housing axis, and the sieve basket jacket being similar by the sector-forming separator (s). It is separated by a setter. The supports are also designed as sieves and separated into support sectors by sector-forming separators, with each support sector having at least one hole (mostly circular) for introducing a coolant stream into the corresponding sieve basket.

The sieve basket jacket is cylindrical in shape and is installed on an axis parallel to the axis of the sieve housing. However, this may be suitably improved to conical form.

In the apparatus of the present invention, the backflow flap should be operated as described above, and the discharge union should be opened and closed if necessary by the provision of a valve, flap or shutter. It is automatically adjusted by installing each backflow flap with a closing flap so that the discharge union closes when the backflow flap opens the sector in place and the discharge union closes the sector in place and causes back flushing. Opens.

The division of the sieve housing by one or more sector-forming separators may be adopted when required to be special. The sector-forming separator separates the sieve housing into sectors of the same cross section. This is hydrodynamically good and minimizes turbulence in the coolant stream. The sieve housing can be subdivided into two sectors by a single sector forming separator and the two sectors are plotted by a single backflow flap. The sieve housing is also divided into four compartments by a pair of sector forming separators in the cross shape, which are operated by four counterflow flaps, each rectangular in shape. In this case, two pairs of backflow flaps, which are rectangular, are arranged on two pairs of shafts, with one shaft axis extending 90 ° with the other shaft axis. Also, the rectangular backflow flap is arranged on two pairs of shafts, one pair of shark shafts forming 90 ° with the other shaft shaft. The operation of the backflow flap bonded to the periodic compartment end flush backsequence is easily controlled with the help of modern devices and control techniques, so no detailed description is required.

Various devices of the present invention will be described by way of example with reference to the accompanying drawings and numbers.

Each device shown in the drawing includes a cylindrical sieve housing 1, at least one sieve basket 2 with a central shaft 3, and a reverse flushing system 4 for the mechanical cleaning of the cold good stream from the generator condenser system. It is composed of Each sieve basket 2 has a head 5 and a jacket 6 and is attached to a support 7 attached to the sieve housing 1. The precipitated debris is separated with the aid of a backflushing system 4 containing a discharge union for discharging the separated debris as described below.

On the right side of Figs. 1 and 2 are shown a single-sieve basket 2, which may extend on the left side, while on the right side of Figs. The save basket 2 is shown.

3 and 4 illustrate the shape and position of a single sieve basket, and FIGS. 5 and 6 illustrate the arrangement of multiple sieve baskets.

In each device, the coolant stream passes axially through the sieve housing 1 at one end in the axial direction and out at the other end in the axial direction.

In the apparatus shown in FIGS. 1, 2, 3, and 4, the sieve housing 1 has a single sector forming separator 8, which has the sieve basket (s) in the flow direction ( Starting at the topstream of 2) and extending over the full length of the sieve basket (s), the sieve basket (s) are separated into two sectors S. The reverse flushing system 4 contains the discharge union 9, the substream of the sieve basket (s) 2, the single backflow flap 10 on the axis 17 in each sector S, the upper stream of the sector S The back flush is closed periodically and alternately.

As shown in FIG. 1, when the right sector S is closed, the corresponding discharge union 9 is opened by the valve 11, while if the other discharge union 9 is closed, the result is a flow direction. It is indicated in the direction of arrow 12. The coolant is cleaned past the left sector S in the positive direction, but some of the coolant is converted in the direction indicated by the arrow 12 to prevent reverse flushing, so that the attached residue is not only the sieve jacket 6 in the right sector. It is also removed from the sheave basket head 5 and the support 7 which are configured identically to the sieve.

Following the device shown in FIG. 3, the sieve basket 2 positions the head 5 in the direction of flow, while in the device of FIG. 4 the sieve basket 2 is conical sieve jacket 6 and dome shaped. Shown by the sieve head 5. As can be seen in FIGS. 1 to 4, the centrifugal basket has a sieve basket 2 (ie a sieve jacket 6) and is spaced apart and joined together by an annular sieve head 5 and a support 7. The plurality of sieve baskets disposed in the plurality of sieve baskets has a sieve basket shaft 3 corresponding to the sink housing shaft. However, the configured baskets shown in FIGS. 5 and 6 may be employed. In this case, the support 7 constructed as a sieve is divided into four support sectors S 'by the sector forming separator 8, each support sector S' having one or a plurality of holes 14 for cooling water. It is introduced into the sieve basket (2) and the jacket (6) in the shape of a waste container or a cone.

The embodiment shown in FIGS. 8 and 9 is very simple in the operation of the backflow flap 10 as described below. When the four backflow flaps 10 move each valve 11 to open the sector S ', the holes 15 in the discharge union 9 are closed and the backflow flap 10 closes the sector S' to reverse rushing. When caused, the hole 15 in the discharge union 9 opens. The discharge union 9 is thus placed centrifugally in the sieve housing 1 and contains an elbow band portion 16 extending past the outside of the housing.

1-4 show the apparatus of the present invention which bisects the sieve housing 1 into semi-cylindrical sectors S as a single sector forming separator 8. 5 to 9 show the quadrant shaped sector S 'used as the cross-shaped sector forming separator 8 as the backflow flap 10, which is a quadrant-shaped copy of the sieve housing 1, as described above. It is back flushed together. The present invention can provide four or more sectors S. Although not shown in FIGS. 5 and 6, in the autonomous of FIGS. 5 and 6, in the direction of flow between the sieve baskets 2 in the left sector to impart clean water to the entire sieve baskets 2 during reverse flushing. It is possible to install additional additional separators. The sieve baskets 2 may also use a pair of poles, for example, installed in parallel with each other and containing a plurality of straight sieve walls constituting the sieve basket jacket 6, in which case the sieve basket The middle pole may extend parallel to the diameter.

The apparatus shown in FIGS. 1-4 can be simply improved and modified as shown in FIGS. 10-14.

The reverse flushing system in this arrangement is provided upstream of the sheave basket 2 and extends radially on the housing axis 13 and has an outlet channel 18 having a central outlet 9 for outflow from the housing. It contains. The reverse flushing system 4 also incorporates a valve arrangement containing a backflow flap 10 in the form of a sector for cooling water steam and a closing flap 11 for the central outlet 19. The valve arrangement is mounted vertically to the sieve housing shaft 13 and the discharge channel shaft 20 between one of the two normal operating positions (see FIG. 11) (see FIGs. 12 and 13). Rotate about the operating shaft 17. The valve device is provided with a closed flap 11 completely closing the outlet 19 when the backflow flap 10 is in the normal operating position and a closed flap 11 when the backflow flap 10 is in the position for reverse flushing. One side of the outlet 19 is opened. The closing half flap 11 is V-shaped at an angle of about 90 °, and as can be seen from the direction parallel to the rotation axis 17, the general apparatus has the reverse puple flap 10 and the closing half flap arranged in a Y shape.

The discharge channel 18 contains a full mouth cowl 21 having an outlet 19 facing in the same direction as the flow direction of the internal water under normal operating conditions. Two backflow flaps 10 operate on outlet channel 18 and two containment half flaps 11 operate on outlet cowl 21. The discharge channel 18 is connected at one side to the discharge union 9. The outlet cowl 21 contains a working wall 22 along which the outer end of the containment half flap moves as the working surface is rotated. The sieve device contains a cylindrical sieve basket jacket 6 coaxially mounted to the sieve housing 1 and topped by the sieve basket head 5. A common sector forming separator 8 is installed in the direction of flow of the coolant under normal operating conditions such that the downstream stream of the common actuating shaft 17 for the valve device passes through the sieve basket 2 of the device. A cam 23 for the closing half flap 11 is installed, one or the other being continuous when the valve arrangement is in one or other positions for reverse-flushing operation.

Claims (11)

It consists of a cylindrical sieve housing, at least one sieve basket with a soft-odin axial axis parallel to the housing axis, a backwash flushing system, the sieve basket having a sink head and sieve jacket, attached to the sieve housing by the sieve jacket To a mechanical cleaning device of the coolant stream, which is attached to the mounted support and separated by a reverse flushing system having a device for deposit residue, in which the coolant strip is introduced along the sieve housing 1 in the direction of the axis 3 and The housing 1 has at least one sector forming separator 8 starting in the flow direction along the upstream stream of the sieve basket 2 and forming at least one sieve basket head 5 and a support 7. At least one component having a sector forming separator 8 and forming the sieve basket head 5 and the support 7 is formed in sieve form. The reverse flushing system has a discharge union (9) in each sector upstream of the sieve basket (2) and the support (7) and has at least one backflow flap (10) so that the compartment is continuous on the upstream for reverse flushing. Mechanical cleaning device for cooling water, characterized in that the sealing. 2. A sieve jacket according to claim 1, comprising a plurality of sieve baskets (2) arranged centrifugally and a sieve jacket (6) joined together spaced apart from each other by an annular head plate and a support plate. Coincident with the axis of the housing, wherein the sieve jacket is separated into similar sectors by a sector forming separator. 2. The support according to claim 1, wherein the support (7) is designed as a sieve and separated by a support sector by a sector forming separator (8), with each support sector introducing at least one coolant into the corresponding sieve basket (2). Apparatus for mechanical cleaning of cooling water, characterized by having a hole (15). 4. A discharge flap (9) according to claim 3, wherein a closing flap (11) is provided in each of the backflow flaps (10) to close the discharge union (9) when the backflow flap opens the sector in place. When the countercurrent flushing opens the outlet oil ions. 5. Apparatus according to claim 4, characterized in that the sieve housing (1) is separated into two sectors in the radial direction by a single sector forming separator by a single countercurrent flap (10). 4. Apparatus according to claim 3, characterized in that the sieve housing (1) is radially by means of a pair of compartment forming separators in four compartments each operated by four rectangular countercurrent flaps. 7. Apparatus for mechanical cleaning of cooling water according to claim 6, characterized in that a pair of hexagonal backflow flaps is mounted on a single actuating shaft (17), wherein one of the backflow flaps forms 90 [deg.] With the other backflow flap. . 7. The apparatus for mechanical cleaning of cooling water according to claim 6, wherein two pairs of hexagonal countercurrent flaps are arranged on two pairs of shafts, and one pair of shaft sides forms 90 ° with another pair of shaft sides. 2. The valve device according to claim 1, wherein the valve device is in common with the discharge channel axis between the normal housing setting and the reverse-flushing setting, while the discharge channel 18 passes straight through the cylindrical sieve housing. A valve device consisting of two backflow flaps 10 spaced apart on an operating axis and two closed half-flaps 11 spaced apart on the operating axis, and a backflow flap 10 that forms a Y-shaped assembly in a direction parallel to the axis of rotation; Rotating half-shape flap (11) and V-shaped working shaft joules arranged at each other in a cross-sectional direction at an angle of about 90 degrees; the charge cowl having an outlet directed in the flow direction of the coolant under normal operating conditions. 21), two countercurrent flaps operating on one side of the outlet channel 18, two closed half flaps operating in the outlet cowl, and a common operating shaft connecting through the outlet cowl. It is a mechanical cleaning device for the cooling water. 9. Apparatus according to claim 8, characterized in that the outlet cowl (21) has an arc-shaped wall (22) arranged along the path of the outer edge of the closed half-flap (11). The method according to claim 8 or 9, wherein when the valve shaft is in any position for the reverse-flushing operation, the valve shaft is in contact with the valve shaft in the downward flow of the operating shaft to the valve device in the flow direction of the coolant under the normal operating conditions. And a diametric sector forming separator having a gap of closed half-flaps.

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