JP3316296B2 - Shell removal equipment for intake and discharge channels of power plants - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shell removal device for an intake / discharge channel of a thermal power plant or the like.

[0002]

2. Description of the Related Art For example, in the intake / drainage channel of a seaside thermal power plant, breeding of mussels (sea mussels) among marine organisms,
Phenomena such as falling off, flowing down, and sedimentation occur.

[0003]

As a result, damage due to failure of the condensate pump, reduction of the cross-sectional area of the water channel, release of shellfish into the high seas, and accumulation thereof are enormous.

[0004] The present invention has been proposed in view of such circumstances, and in order to facilitate the collection of a large amount of shellfish flowing down, they are collected near the side wall of the waterway, and the collected shellfish are discharged to land. It is an object of the present invention to provide a shell removal device for the intake / drainage channel of a power plant.

[0005]

SUMMARY OF THE INVENTION To this end, the present invention provides a water supply / discharge channel protruding from a floor surface and extending obliquely upstream from one side wall of the above water channel at an acute angle, with its tip being located between the other side wall. An upstream submerged weir having a relatively narrow clearance, and protruding from a floor surface of the waterway slightly downstream of the upstream submerged weir and extending from the other side wall substantially in parallel with the upstream submerged weir, A downstream sinking weir having a relatively wide gap between the side wall of the downstream weir and a suction port opening on the floor slightly downstream of the wide gap at the tip of the downstream weir, sucking the water in the waterway, and then cleaning the screen A shell separation water flow path is provided, which separates the shellfish contained in the built-in recovery tank and then drains the water downstream of the waterway.

[0006]

According to such a configuration, the following operation is performed. That is, as shown in FIG. 3, the shells approaching the sinking weir while flowing down and sliding on the floor of the waterway reach the gap between the tip of the upstream sinking weir (hereinafter referred to as the upstream weir) and the right wall 2R. Gather at a certain entrance A. The collected shells are transported downstream along the two weirs by a vortex generated between the two parallel weirs, and the transported shells are then moved to the tip of the downstream sinking weir (hereinafter referred to as the downstream weir) and the left wall 2L. And collects and accumulates in part B near the left side wall. The shellfish thus accumulated in the part B is sucked from the suction port by the suction action of the jet pump, and then introduced into the collection tank.
Here, they are separated by a screen. The separated shellfish and the screen are discharged by a crane and disposed of by a crane, and only the water not containing the shellfish that has flowed through the screen is introduced to the downstream of the water channel through a drain pipe.

[0007]

1 is a plan view, FIG. 2 is a longitudinal sectional view, FIG. 3 is a plan view showing a water flow in FIG. 1, and FIG. FIG. 5 is a main dimension diagram of a cross section taken along the line VV of FIG.

First, in FIGS. 1 to 3, reference numeral 1 denotes a waterway, 2
L and 2R are left and right walls of the water channel 1, 3 is a water flow indicated by an arrow of the water channel, 4 is an upstream weir protruding from the floor surface of the water channel 1 and having an acute angle θ from the left wall 2 L and extending diagonally upstream. And there is a clearance D _U between the tip and the right side wall 2R.
Reference numeral 5 denotes a downstream weir slightly behind the upstream weir 4 and projecting from the bottom of the water channel in parallel with the upstream weir 4, and a tip of which extends diagonally from the right side wall 2R toward the downstream of the water path, between the tip and the left side wall 2L. Is provided with a large clearance D _L. 6 is the left wall 2
L, a suction port provided at a position slightly behind the base end of the upstream weir 4, a jet pump 8 for sucking seawater introduced from the suction port 6 with the driving water 7 and discharging the same, and 9 a jet pump 8 The collection tank is connected to the discharge port, and the inside of the collection tank 9 is partitioned by a screen 10 into two front and rear chambers or two upper and lower chambers. Reference numeral 11 designates drainage from the recovery tank 9 as the water channel 1
It is a drainage pipe leading to the downstream of.

In such a structure, its main dimensions are defined as shown in FIGS. That is, U: flow velocity of the water channel W: width of the water channel H: water depth of the water channel h: height of the weir L _U : length of the upstream weir L _L : length of the downstream weir D _U : clearance between the upstream weir and the side wall of the water channel D _L : Clearance between downstream weir and water channel side wall d: Flow width between upstream weir and downstream weir θ _U : Angle between upstream weir and right side wall θ _L : Angle w between downstream weir and left side wall w : Thickness of weir

An experiment was conducted on such a device, and it was found that the accumulation of shellfish was good in the following dimensional ranges shown in FIGS. This is because the shells are swept away because the flow velocity in the flow path between the parallel weirs formed by the submerging weirs 4 and 5 is relatively high, and the flow velocity decreases at the downstream end of the parallel weirs. . 1 / 10H <h <1 / 2H 8 / 10W <L U <W 5 / 10W <L L <W h <D U <2h 1 / 10W <D U <3/10 3 / 10W <D L <7 / 10 h <d <3h 45 ° <θ _U <100 ° 45 ° <θ _L <100 ° 1 / 10h <w <h

Therefore, a suction port 6 (FIG. 1) is provided in the shellfish collecting portion in such a range, and the collected shellfish is sucked by the jet pump 8 and discharged to the collection tank 9. Then, the shellfish remains on the screen 10, and the water returns to the water channel 1 from the drain pipe 11.

[0012]

According to such an apparatus, the shells flowing down the waterway accumulate in one place by the effect of the sinking weir.
The accumulated shellfish are sucked by the ejector pump and landed. Therefore, there is no damage caused by the falling shellfish. In the above embodiment, the suction port may be provided to penetrate the side wall or the floor near the side wall, and a fish pump may be used instead of the jet pump. This is because, according to a jet pump, a fish pump, etc., the shellfish can be sucked intact with the water stream without being damaged, and can be introduced into the collection tank.

In short, according to the present invention, a projecting portion is provided on the floor of the intake / drainage channel, extends obliquely upstream from one side wall of the channel at an acute angle, and has a relatively narrow clearance between its tip and the other side wall. An upstream sinking weir, and projecting from the floor of the waterway slightly downstream of the upstream sinking weir and extending substantially parallel to the upstream sinking weir from the other side wall, with its tip between the one side wall A downstream sinking weir having a relatively wide gap and a suction port opening on the floor slightly downstream of the wide gap at the tip of the downstream weir, and sucking the water in the water channel, and collecting the water in a recovery tank incorporating a screen. After separating the contained shellfish, by having a shellfish separation water flow path draining to the downstream of the above-mentioned waterway, a large amount of shellfish flowing down is accumulated near the waterway side wall,
Furthermore, the present invention is extremely useful industrially because a shell removal device for the intake / drainage channel of a power plant that discharges accumulated shells is obtained.

[Brief description of the drawings]

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

FIG. 2 is a longitudinal sectional view of FIG.

FIG. 3 is a plan view showing a water flow in FIG. 1;

FIG. 4 is an explanatory diagram of dimensions of the weir of FIG. 3;

FIG. 5 is a dimensional view of a cross section taken along the line VV of FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Waterway 2L Left side wall 2R Right side wall 3 Water flow 4 Upstream weir 5 Downstream weir 6 Suction port 7 Driving water 8 Jet pump 9 Recovery tank 10 Screen 11 Drain pipe

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁷ , DB name) E02B 9/00 E02B 9/04 E02B 5/00 E02B 1/00 301

Claims (1)

(57) [Claims] 1. An upstream submerged weir protruding from the floor of an intake / discharge channel and extending obliquely upstream at an acute angle from one side wall of the water channel, and having a relatively narrow clearance at its tip with the other side wall. A protruding part of the floor of the waterway slightly downstream of the upstream sinking weir, extending from the other side wall almost in parallel with the upstream sinking weir, and having a relatively large clearance between the tip and the one side wall. The downstream sinking weir and the downstream weir, the water in the waterway was sucked from the suction port opening on the floor slightly downstream of the wide gap at the tip of the downstream weir, and the contained shellfish was separated by a collection tank incorporating a screen. A shell removal device for an intake / drainage channel of a power plant, further comprising a shellfish separated water channel for draining the water downstream of the channel.