JPH0615120A - Device for removing foreign matter - Google Patents

Abstract

PURPOSE:To provide a foreign matter removal device having high separation efficiency of foreign matter and with small pressure loss and small installing space in a condenser, etc., using sea water, etc., as cooling water is order to prevent heat the lowering of transfer performance due to the clogging of thin tubes with foreign matter in cooling water and a hindrance to the smooth use of a ball washer. CONSTITUTION:The 1st and 2nd stage rotatable flaps 12, 16 which are installed on the upstream side of filter members 4, 6 connected with each other at their tips in the shape of a chevron in a shell and foreign matter discharge pipes which communicate with a foreign matter retained space are provided. The sticking conditions of foreign matter is monitored while detecting the differential pressure across the filter members 4, 6 and discharge valves installed in the discharge pipes are opened according to the stuck quantity to discharge a part of cooling water. At the same time, after the 1st stage flap is operated to remove the foreign matter stuck to a part of the filter member by vortex, it flows down to the downstream area of the 2nd stage flap to operate the 2nd stage flap, causing foreign matter stuck to the filter member to be effectively discharged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is effective for foreign substances such as marine organisms, wood chips and shells contained in cooling seawater or river water used in pipe heat exchangers such as condensers for thermal power plants and nuclear power plants. In addition, the present invention relates to a foreign matter removing device for separating the cooling water and discharging it from the system.

[0002]

2. Description of the Related Art As a conventionally known foreign matter removing device of this type, there is JP-A-58-3607. In this device, a plurality of filtering members are arranged in a cylindrical body in a slanting connection in a mountain shape, a foreign matter discharge chamber is arranged on the body wall side at the downstream end of the filtering member, and a fluid flows into any filtering member. In this configuration, a flap valve that blocks the above is provided and the filtration member is washed by backwashing.

[0003]

As a result of conducting a model experiment on the above-mentioned known foreign matter removing apparatus, it has become clear that there are many problems regarding foreign matter discharge. From the confirmation test of the foreign matter removal effect by the filter device model in which the filter members are connected at the tip to form a chevron shape, the foreign matter is removed only in the vicinity of the foreign matter discharge pipe at the end of the filter member, and the chevron-shaped tip portion of the filter member and the center of the filter material are removed. It was observed that foreign matter was difficult to discharge in the part. This is due to the structure that the backwash flow in the body acts only near the foreign matter discharge pipe, and the streamline in the device conforms to the principle of the flow for backwashing. It is considered that it is not.

Further, a cylindrical filter element is provided in a cylindrical casing as described in JP-B-55-49898, a swirl flow is caused by the operating angle of the inlet valve, and the floating phenomenon due to the vortex flow is utilized. There is known a foreign matter removing device which catches foreign matter on the outer surface of the filter and discharges the foreign matter from a drawing and discharging pipe in a tangential direction of the casing.
Although this method has achieved a certain level of foreign matter removal performance, it has a drawback that it requires a large space for placement and cannot be installed due to the shape of the piping system, and the development of a more compact foreign matter removal device is required. ing.

The object of the present invention is to remedy the drastic drawbacks of the known examples, and to completely remove the foreign substances adhering to the filtration member,
Another object of the present invention is to provide a superior foreign matter removing device having a new structure that can be installed even in a tough place.

[0006]

Regarding the foreign matter removing apparatus of the present invention created to achieve the above object, the basic principle thereof will be described below.

The point of the present invention is to capture and remove foreign matter such as marine organisms, wood chips, and shells from cooling seawater, river water, etc., in which the tip end is connected to the inside of the body to form a mountain-shaped rotatable member. The filter member, the first-stage flap, the second-stage flap, and the foreign matter discharge pipe are arranged, and the foreign matter attached to the front surface of the filter member is caused to flow down to the downstream side of the second-stage flap by the operation of the first-stage flap, and thereafter. By operating the second-stage flap, the flow from the surface is blocked by a part of the filter member by the second-stage flap, so that in this part of the filter member, from the rear surface of the filter member toward the foreign matter discharge port. A flow is generated, and the foreign matter is discharged to the outside of the system by the backwash flow through the discharge pipe.

The operation of the first-stage flap and the second-stage flap is such that the cleaning operation is started by detecting the differential pressure generated by the foreign matter adhering to the front surface of the filtering member. If the differential pressure rises abnormally, as an emergency measure, rotate all the filtering members at the same time and place them in the open position to let the cooling water and foreign matter flow out into the large capacity condenser water chamber. It is possible to prevent abnormal deterioration of vessel performance. The present invention relates to a foreign matter removing device based on the above principle.

[0009]

In the foreign matter removing device configured as described above, the foreign matter adhering to the filtering member is removed by the operation of the first-stage flap to the second
It is possible to completely remove foreign matters by allowing the foreign matters adhering to the filter member to be backwashed by the operation of the second-stage flap (washing with back-flowing water) while being made to flow down to the downstream area on the step flap side.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a foreign matter removing device according to the present invention is shown in FIG.
This will be described with reference to FIGS. 2 and 3. FIG. 1 shows a vertical cross-sectional view of the foreign matter removing device during normal operation. (A) Device body 1 and (b)
Filter members 4 and 6, (c) first stage flaps 12 and 14,
(D) Second stage flaps 16 and 18, (f) Foreign body discharge pipes 8 and 10 and discharge valves 9 and 11 attached to the body 1, and the first stage flaps 12 and 14 have shafts 13 and 15 In the center, the second-stage flaps 16 and 18 function so as to be rotatable about axes 17 and 19 from a position parallel to the flow of cooling water to a position close to the filtering members 4 and 6. The arrows in this figure indicate the flow direction of the cooling water.

The filtering members 4 and 6 are made of a perforated plate or a lattice, and are formed in a mountain shape so that one end contacts the guide 20 and the other end contacts the inner wall of the body 1. Shafts 5 and 7 are provided in the middle so as to be rotatable around these shafts.

The foreign matter discharge pipes 8 and 10 are (or) a chamber (foreign matter reservoir) formed by the filter member 4 (or 6), the second stage flap 16 (or 18), and the body 1 (or), so that foreign matter can be easily discharged. It is located at the position.

An embodiment of the foreign matter removing apparatus according to this embodiment having the above-described structure will be described below.

During normal operation, the first stage flaps 14, 1
5. The second-stage flaps 16 and 18 are set at positions substantially parallel to the cooling water streamlines, and the cooling water is connected to the inside of the body 1 at the tip and foreign substances are removed by the mountain-shaped filtering members 4 and 6 and then heat is applied. Guided to an exchange. On the other hand, the foreign matter in the cooling water is accumulated on the front surface (front surface) of the filtering members 4 and 6, causing clogging of the holes of the filtering members 4 and 6 and increasing the pressure difference between the filtering members 4 and 6. The differential pressure between the filtering members 4 and 6 is detected by using the pressure detection ports 21 and 22 arranged in the body 1, and the differential pressure gauge 23
Is converted into an electric signal and input to the control device. When the detected differential pressure rises to the first specified differential pressure at which the cleaning operation of the filtering members 4 and 6 should be started, a signal from the control device causes
The discharge valve 9 opens, and the drive device for the shaft 13 of the first-stage flap operates. When the discharge valve 9 is opened, a part of the foreign matter near the discharge port of the foreign matter reservoir is discharged, and at the same time, the operation of the first-stage flap 12 causes a local vortex flow on the front surface (surface) of the filtering member 4 to remove the foreign matter. The foreign matter can be moved to the vicinity of the second-stage flap 16 by repeating the operation of the first-stage flap 12 which is separated and floats and stays in the vicinity of the second-stage flap 16. By operating the second-stage flap 16 while setting 12 to the normal position, a vortex flow is generated on the front surface of the filtering member 4 and foreign matter is separated. The second stage flap 16 is the filtering member 4.
When stopped at a position close to, a flow from the rear surface is generated in the filtering member 4 in the foreign matter collecting portion, and all the foreign matter in the foreign matter collecting portion is removed from the system through the foreign matter discharge pipe 8.

Simultaneously with the completion of foreign matter removal (cleaning) of the filter member 4, the discharge valve 9 is closed and the discharge valve 11 is opened to open the filter member 6.
Removal of foreign matter (cleaning) is repeated by the same procedure as in the case of the filtering member 4.

FIG. 2 shows a foreign matter removing apparatus according to the present invention.
An example of the actual situation in which a large amount of inflowing foreign matter flows in a short time and the filter member is suddenly clogged will be described. When a large amount of foreign matter in which the differential pressure across the filtering member rapidly rises to the second specified differential pressure set higher than the first specified differential pressure described above, all the filtering members are simultaneously rotated to the open position to remove the cooling water and the foreign matter. Can be temporarily retracted to the condenser side having a large volume.

As a result, it is possible to prevent a situation in which the flow rate of the cooling water is abnormally reduced due to clogging and affects the entire plant. In addition, a large amount of foreign matter temporarily saved in the condenser is discharged from the system by the backwash system of the condenser, etc. It is possible to eliminate everything outside the system via.

FIG. 3 shows the operating state of the foreign matter removing apparatus of the present invention. The operating state of the first-stage flap and the moving state of foreign matter on the filter member are shown in (a), and the operating state of the second-stage flap is shown. The local flow of the filtering member is shown in (b). These show the simulated state based on the model experiment results. Based on the detection signal of the differential pressure across the filtering member, the controller selects the operation mode such as normal operation, cleaning operation, and emergency operation, and the respective operation. Fully automatic operation becomes possible by controlling.

[0019]

As described above, the foreign matter removing apparatus of the present invention can effectively remove foreign matter in cooling water, requires a small space for installation, and even when an unexpected large amount of foreign matter flows in, which is an unexpected situation of the cooling water system. It is highly reliable because it can prevent a trip (emergency stop) of the plant due to a large reduction in cooling water.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view showing an actual operating condition in one embodiment of the present invention.

FIG. 3 is an operation explanatory view showing an operating condition in the embodiment of the present invention.

[Explanation of symbols]

1 ... Body, 2 ... Cooling water inlet side, 3 ... Cooling water outlet side, 4,
6 ... Filtration member, 9, 10 ... Foreign matter discharge pipe, 12, 14 ... First stage flap, 16, 18 ... Second stage flap 21, 21,
2 ... Differential pressure outlet, 23 ... Differential pressure gauge, 24, 25 ... Differential pressure detection tube.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Reference number within the agency FI technical display location B01D 35/16 6953-4D (72) Inventor Yoshio Sumitani 3-chome 1-chome, Hitachi-shi, Ibaraki Hitachi Ltd. Hitachi Works (72) Inventor Hideki Ima 1-284 Funakoshi-cho, Yokosuka City, Kanagawa Prefecture 5 Hitachi Machinery Engineering Co., Ltd. (72) Keizo Ishida 1-284 Funakoshi-cho, Yokosuka City, Kanagawa Prefecture No. 5 in Hitachi Mechanical Engineering Co., Ltd. (72) Inventor Norio Matsuura 1-284 Funakoshi-cho, Yokosuka City, Kanagawa Prefecture No. 5 Hitachi Machine Engineering Co., Ltd. (72) Susumu Fukudome 1-284 Funakoshi-cho, Yokosuka City, Kanagawa Prefecture No. 5 within Hitachi Mechanical Engineering Co., Ltd. (72) Inventor Takashi Ito Kanagawa 5 Hitachi Mechanical Engineering within the Corporation of chome address 284 Suga City Funakoshi-cho

Claims (3)

[Claims] 1. A foreign matter removing device installed in a cooling water inlet pipe portion of a condenser (a). A body fixedly connected to the pipe, (b). A rotatable filter member connected to the body at the tip to form a chevron shape; A rotatable first-stage flap provided on the upstream side of the filter member; and (d). A rotatable second stage flap provided on the downstream side of the first stage flap, and (e). A foreign matter reservoir space formed by the members (a), (b), (c), and (d), and (f). A foreign matter discharge pipe provided on the body so as to communicate with the foreign matter storage space, and (g). A discharge valve provided on the foreign matter discharge pipe, and means for detecting a differential pressure across the filter member;
Opening the discharge valve based on the output signal of the detection means,
A foreign matter removing device characterized in that the foreign matter is discharged by means for controlling the operation of the first-stage flap and the second-stage flap. 2. The first stage flap and the second stage flap,
In the normal operation position, it becomes parallel to the flow of cooling water, and during foreign matter removal operation, it can move to a position that opposes the flow direction of water flow during normal operation. The foreign matter removing device according to claim 1, wherein the foreign matter removing device guides to a discharge pipe. 3. The automatic control means, when the pressure difference between the front and the rear of the filter member reaches a specified value, opens the discharge valve to move the first-stage flap so as to attach to the front surface of the filter member. The foreign matter removing device according to claim 1, wherein the foreign matter removing device controls the second stage flap so as to rotate after the foreign matter is caused to flow down to the downstream region of the second stage flap.