JPH0634713U - Foreign matter removal device in dust-containing fluid pipeline - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a foreign matter removing device in a dust-containing fluid pipe that enables smooth removal of a large amount of foreign matter in a short time. [Structure] Flap valves 3a, 3b at the front end positions of the filter elements 2a, 2b for opening and closing the flow in the upper and lower halves of the cross section of the pipeline, respectively, and the rear end of the tapered filtration flow region 8 Discharge valve 6 branched into the above pipe
In the foreign matter removing device in the pipeline having a and 6b, the filter element 2a in the upper half and the lower half is
A single or a plurality of vertical partition plates 7 which are vertically provided over substantially the entire length of 2b and partition the above-mentioned two halves into substantially equal cross-sectional areas.
a, 7b and foreign matter discharge valves 6a1, 6a2, 6b1, 6 respectively disposed at the rear of the respective taper diversion filtration regions 9 partitioned by the vertical partition plates 7a, 7b.
It is equipped with b2.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a foreign matter removing device in a dust-containing fluid line.

[0002]

[Prior art]

 For example, in coastal power plants, it is necessary to use a large amount of seawater as condenser cooling water, but since seawater contains dust, shellfish, etc. When it flows into the condenser as it is, various problems occur, so these foreign substances must be removed in the intake channel. The applicant previously proposed the following means as Japanese Patent Application No. 61-33852 as an apparatus for removing foreign matter in a channel used for this type of application. According to the same proposal, as shown in the vertical sectional view of FIG. 6, from the central portion of the cross section of the casing 1 to the downstream side, one is provided with an ascending slope and the other is provided with a downwardly sloped filter element 2a, 2b. The cleaning flaps 3a and 3b each having a rotary shaft driven from the outside of the casing are provided on the upstream side of each of the filter elements 2a and 2b, and penetrate the casing to the downstream side of the filter element. The discharge ports 4a and 4b which are opened, the discharge pipe pieces 5a and 5b and the discharge valves 6a and 6b attached thereto are connected in series. In such a structure, seawater flows from the left to the right as shown by the arrow, and the flow of seawater in the filtration basins 8a and 8b outside the filter element, which is tapered toward the downstream side, is the fluid that the filter itself has. Due to the passage resistance, the foreign matter density increases toward the downstream side, and the inflowing foreign matter collects and accumulates near the downstream inside the filter element.When foreign matter accumulates here, the fluid resistance of the foreign matter removing device increases and Since the cooling water supply capacity decreases, the filter element is cleaned when the amount of foreign matter accumulated reaches a certain level. As shown in the longitudinal sectional view of FIG. 7 and the front view of FIG. 8, the cleaning operation is performed from a state (open position) in which the cleaning flap 3a provided inside one of the filter elements 2a is parallel to the flow. By changing to the disturbing state (closed position), a flow that disturbs the filtration basin 8a of the filter element is formed on the downstream side, and the turbulent flow causes foreign matter trapped in the filter to separate, causing a flow inside the filtration basin 8a. Floating action occurs. Foreign matter floating in the filtration flow region 8a is discharged to the outside from the discharge pipe piece 5a by following the suction flow generated near the discharge port by opening the foreign matter discharge valve 6a. When the foreign matter captured by the filter element 2a is completely discharged to the outside, the cleaning flap 3a is returned from closed to open. As shown in the diagram in FIG. 9, opening and closing of the cleaning flap and the discharge valve as described above is performed for the other filter element 2b as well, whereby the cleaning is completed and all the cleaning steps are completed.

[0003]

[Problems to be solved by the device]

 However, this type of foreign matter removing device can remove foreign matter that has been captured for a relatively long time, but if a large amount of foreign matter flows in within a short time, the following problems occur. . That is, when a large amount of foreign matter flows in for a relatively short time, the cleaning flap 3a provided in the filtration flow area 8a of one of the filter elements 2a blocks the flow, so that the water flowing into the apparatus has the other filter element 2b. It will flow only on the side, which will cause a throttling effect. The amount of water flowing into the device is almost the same between the fully opened state and the fully closed state of the cleaning flap 3a due to the pump characteristics, and since there is no great difference, the flow velocity of the water passing through the filter element 2b is nearly doubled. When cleaning is started with a large amount of foreign matter caught in the filter all at once and the cleaning flap 3a is closed, the fluid resistance due to the foreign matter trapped on the filter element 2b side increases with the flow velocity of the passing water. Together with this, the number of actions taken to clean the filter may rather reduce the cooling water supply capacity to the condenser. In order to solve this problem, for example, as shown in FIG. 10, the surface area (water permeation area) of the filter element is increased to reduce the influence on the increase in fluid resistance, or as shown in FIG. It is conceivable that the device is divided into two systems and the water flow cross-sectional area per system is halved to reduce the throttling effect by cleaning each system one by one. However, in the former case, if the filter element is lengthened, it is necessary to increase the distance between the surfaces of the device, as shown in FIG. The effective flow becomes weaker near the downstream of the filter, which may lead to performance degradation.As shown in Fig. 2B, if the smooth surface of the filter element is made uneven, the filter structure becomes complicated. However, it is not easy to manufacture, and the foreign matter trapped in the recesses is less likely to come off, which may lead to deterioration in performance. In the latter case, the installation of two devices is disadvantageous in terms of installation space.

The present invention has been proposed in view of the above circumstances, and provides a foreign matter removing device in a dust-containing fluid line that enables smooth removal of a large amount of foreign matter even if it is introduced in a short time. The purpose is to provide.

[0005]

[Means for Solving the Problems]

 Therefore, in the present invention, the front end is located on the center of the cross section of the large-diameter pipe through which the dust-containing fluid flows, and the downstream end extends downward with an upward slope and the downward slope, and the rear end is fixed to the upper and lower parts of the inner surface of the pipe to face each other. A pair of upper and lower filter elements forming a tapered filtration area between the inner surface and the inner surface, and opening and closing the flow in the upper half and lower half of the cross section of the pipeline at the front end position of the filter element. In a foreign matter removing device in a pipeline having a flap valve and a discharge valve branched to the pipeline near the rear end of the tapered filtration basin, in the upper half and the lower half of the foreign matter removing device, the filter element is vertically extended over substantially the entire length of the filter element. One or a plurality of vertical partition plates that divide the two halves into approximately equal cross-sectional areas, and a split-tapered filtration basin partitioned by the vertical partition plates. Was Characterized in that comprises the object exhaust valve.

[0006]

[Action]

 According to such a configuration, the pair of upper and lower filtration basins formed in the pipe by the pair of filter elements are further partitioned from each other by the vertical partition plate or plates to form a plurality of split flow filters. There will be a catchment basin, typically 2n shunt filtration basins. Therefore, in cleaning, as shown in FIGS. 3 to 4, when the cleaning flap 3a1 is closed, the cross-sectional area of the closed pipeline becomes only 1 / 2n of the whole, so the flow velocity due to the throttling effect, that is, the fluid. Minimize the increase in resistance. This can minimize the increase in flow velocity (fluid resistance). This is because the amount of water flowing into the device is not so different before and during washing due to the pump characteristics, so that the filter elements 2a2, ..., 2an and 2b1, of the cross section of the washing flap in the opened state during washing. The flow velocity of water passing through 2b2, ..., 2b2 increases nearly twice when the conventional technique is applied, whereas it is 2 n / 2n-1 times (for example, n = In case of 3, the increase is 1.2 times or less). Therefore, even when cleaning is performed with a large amount of foreign matter caught in the filter at once in a short time, the decrease in cooling water supply capacity to the condenser due to the increase in flow velocity (fluid resistance) is minimized. Be done.

[0007]

【Example】

 An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view thereof, FIG. 2 is a longitudinal sectional view showing a modification of the partition plate of FIG. 1, FIG. 3 is a front view of FIG. 2, and FIG. 3 is a front view showing a modified example of FIG. 3, and FIG. 5 is a diagram showing an opening / closing procedure of the cleaning flap and the discharge valve of FIG. First, in FIGS. 1 to 4, the same reference numerals as those in FIG. 6 denote the same members as in FIG. 6, respectively. The major difference of the present invention from the structure in FIG. 6 is that each filter element is indicated by a vertical partition plate. It means that it is divided into multiple filtration basins on the left and right. That is, reference numeral 7 is a right-angled triangular vertical section that divides the casing 1 into the left and right portions of the tapered filtration basins 8a and 8b which are surrounded by the cleaning flap 3a and the filter element 2a and the cleaning flap 3b and the filter element 2b. This is a partition plate, and the cleaning flap is composed of 4 sheets 3a1, 3a2, 3b1, 3b2 as shown in FIG. 3, and the foreign matter discharge pipe and the discharge valve are all corresponding to the respective cleaning flaps. Are arranged in fours. Here, as shown in FIG. 1, the partition plate 7a may be a right-angled triangular shape having substantially the same size as the filter element 2a, or as shown by hatching in FIG. A relatively long rectangular partition plate 7b extending from upstream to slightly downstream of the filter element may be used.

In such an embodiment structure, the filtering basin of the filter element is a total of four shunt filtering basins due to the two partition plates, but as shown in FIG. By increasing, the filter element filtration basin is generally divided into 2a1, 2a2, ..., 2an and 2b1, 2b2, ..., 2bn, and cleaning flaps 3a1, 3a2, ..., 3an and 3b1, 3b2, respectively. , 3bn and foreign matter discharge ports 4a1, 4a2, ..., 4an and 4b1, 4b2, ..., 4bn are provided. Therefore, at the time of cleaning, first, the cleaning flap 3a1 is closed to clean the filter element 2a1 portion. At this time, the cross-sectional area closed by the cleaning flap is 1 / 2n of the whole, so It is possible to minimize the increase in the flow velocity (fluid resistance) due to the throttling effect, as compared with 1/2 when the technology is applied. Because the amount of water flowing into the device is not so different before and during washing due to the characteristics of the pump, the filter elements 2a2, ..., Of the cross section of the washing flap portion (not closed) portion in the opened state during washing. The flow velocity of water passing through 2an and 2b1, 2b2, ..., 2b 2 is nearly doubled when the conventional technique is applied, while it is 2n / 2n when the present invention is applied. This is because the increase can be suppressed within −1 times (for example, 1.2 times when n = 3). Therefore, even when cleaning is performed with a large amount of foreign matter caught in the filter at once in a short time, the decrease in cooling water supply capacity to the condenser due to the increase in flow velocity (fluid resistance) is minimized. It is.

Although it is conceivable that only the cleaning flap is divided into a plurality of parts without providing the filter partition plate, in this case, the filtering flow area of the filter element generated on the downstream side of the closed cleaning flap is set. The disturbing flow tends to be weakened by the effect of the flow going straight downstream to its perimeter. Therefore, it is very important to install a partition plate so that the flow is not affected by a straight flow on the downstream side. Further, when the cleaning of one filtering basin of the filter element is completed, the cleaning of the other filtering basin is started next. In the present invention, as shown in FIG. 5, the cleaning flap 3a1 operates from closed to open. At the same time, the cleaning flap 3a2 is operated from open to closed. This is because the number of cleaning flaps increases when the cleaning function that waits for the cleaning flap 3a1 to complete the operation from closed to open and then operates the other cleaning flaps 3a2 from open to closed is used. It is noted that the fluid resistance due to the closing of the cleaning flap decreases with the change of the opening when one cleaning flap is operated from the closed to the open, whereas the cleaning process (time) of the whole minute becomes long. This is because the cleaning time can be shortened by operating the cleaning flaps other than those described above from opening to closing to allow an increase in the fluid resistance decrease amount. According to the figure, it can be seen that the cleaning time does not become so long even if the number of cleaning flaps increases, as compared with the case of the conventional foreign matter removing device shown in FIG. The partition plate should be large enough to prevent the disturbance of the filter element's filtration basin downstream of the wash flaps from being weakened by the effect of a flow straight down to its perimeter, i.e. larger. Although it is desirable, the size should be larger than the filter element as a guide.

[0010]

[Effect of the present invention]

 With such a structure, it is possible to reduce the increase in the flow velocity of the water that permeates the filter element when the cleaning flap is closed, so that the cleaning is performed while a large amount of foreign matter is captured by the filter within a short time. In this case, the decrease in cooling water supply capacity to the condenser due to the increase in fluid resistance can be minimized. In short, according to the present invention, the front end is located on the center of the cross section of the large-diameter pipe through which the dust-containing fluid flows, and the upstream end and the downward slope extend downstream respectively, and the rear end is fixed and opposed to the upper and lower parts of the inner surface of the pipe. A pair of upper and lower filter elements forming a tapered filtration zone between the inner surface and the inner surface, and flaps at the front end positions of the filter elements for opening and closing the flow of the upper half part and the lower half part of the cross section of the pipeline, respectively. In a foreign matter removing device in a pipeline having a valve and a discharge valve branched into the pipeline near the rear end of the tapered filtration basin, in the upper half and the lower half of the filter, the filter element extends over substantially the entire length of the filter element. One or a plurality of vertical partition plates that are vertically installed and partition each of the above-mentioned two halves into substantially equal cross-sectional areas, and are installed respectively at the rear of the divergent taper filtration basins that are partitioned by the vertical partition plates. Since a foreign matter discharge valve is provided, a foreign matter removing device in a dust-containing fluid pipeline that enables smooth removal of a large amount of foreign matter in a short time can be obtained. It is extremely useful.

[Brief description of drawings]

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

FIG. 2 is a vertical sectional view showing a modified example of the partition plate of FIG.

FIG. 3 is a front view of FIG.

FIG. 4 is a front view of the modification of FIG.

5 is a diagram showing how to open and close the cleaning flap and the discharge valve of FIG. 1. FIG.

FIG. 6 is a vertical cross-sectional view showing a known foreign matter removing device for cooling water of a power plant condenser.

FIG. 7 is a vertical sectional view showing the state of FIG. 6 during cleaning.

8 is a front view of FIG. 7. FIG.

FIG. 9 is an explanatory diagram showing an opening / closing procedure of the cleaning flap and the discharge valve of FIG. 7.

10 is a vertical cross-sectional view showing a modified example of FIG.

11A and 11B are a side view and a plan view showing a modified example of FIG.

[Explanation of symbols]

 1 Main body casing 2,2a, 2b Filter element 3,3a, 3b, ..., 3an, 3bn Cleaning flap 4,4a, 4b, ..., 4an, 4bn Foreign matter discharge port 5,5a, 5b, ..., 5an, 5bn Foreign matter discharge Pipe piece 6,6a, 6b, ..., 6an, 6bn Foreign matter discharge valve 7,7a, 7b Partition plate 8 Filtration basin 9 Separation and filtration basin

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shin Nakamura 2-1-1, Niihama, Arai-cho, Takasago, Hyogo Prefecture Mitsubishi Heavy Industries, Ltd. Takasago Plant

Claims (1)

[Scope of utility model registration request] 1. An inner surface of a large-diameter pipe through which a dust-containing fluid flows, the front end of which is located on the center of the cross section and extends downstream at an upslope and a downslope, respectively, and the rear end is fixed to the upper and lower portions of the inner surface of the pipe and faces each other. And a pair of upper and lower filter elements that form a tapered filtration area between them and a flap valve that is located at the front end position of the filter element and that opens and closes the flow of the upper half portion and the lower half portion of the cross section of the pipeline, respectively. In the foreign matter removing device in the pipeline having a discharge valve branched into the pipeline near the rear end of the tapered filtration region, in the upper half lower half, the filter element is installed vertically over substantially the entire length of the filter element. A single or a plurality of vertical partition plates for partitioning both halves into approximately equal cross-sectional areas, and a foreign matter discharge valve respectively disposed at the rear of the split taper filtration basin partitioned by the vertical partition plates. A device for removing foreign matter in a dust-containing fluid pipe characterized by comprising: