JPS58218506A - Reduction of flow speed of effluent water and block therefor - Google Patents

Abstract

PURPOSE:To reduce the speed of effluent water by expanding the interval of blocks by a method in which blocks in which the interval between paired left and right-handed main walls is gradually narrowed, a partition wall in the middle of the vertical direction of both the main walls is gradually inclined, and nozzles are provided at the upper and lower parts of the partition wall are set radially. CONSTITUTION:In a block B, the interval between paired left and right-handed main walls 1 and 2 is gradually narrowed, a partition wall 3 is provided in a gradually inclined manner in the middle of the vertical direction of both the main walls 1 and 2, a partition wall 4 is laid from the partition wall 3 at the narrow ends of both the main walls 1 and 2 to the upper parts, and nozzles 5 and 6 are provided at the upper and lower sides of the partition wall 3 between both the main walls 1 and 2. The blocks are set radially in such a way that the nozzles 5 and 6 are inclined toward the sides from the central parts in the horizontal direction of a tailrace 7. The effluent water is dived into the front water region with a sufficient inertial force by means of the upper and lower nozzles 5 and 6 of the blocks B, and thereby the flow speed of the effluent water is reduced by the expansion of the water channel.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to the flow rate of discharge water applied when the cooling water of a condenser discharged from a thermal power plant is discharged from the discharge port of a discharge channel into a public water body such as a port. Regarding reduction methods and blocks to be reduced.

When a water outlet is installed facing a port water area such as a channel, an anchorage, or a shipyard, the water should be released at a sufficiently slow flow rate so that the water does not affect ship navigation, and the flow velocity distribution should be spread over a wide range. It must be equalized to prevent the occurrence of high-velocity waters due to drifting currents. As a way to deal with this, conventional methods have been to install a guide wall or a wave-dissipating block at the outlet of the water outlet.
A water pipe was installed to equalize the flow velocity, but the water that exits the outlet sometimes becomes polarized again, or flows near the surface of the water area in front of the outlet, which is particularly important for ships with shallow water. There was a noticeable impact on navigation. In addition, one possible solution is to widen the water outlet, but in these days of tightening environmental regulations, it is almost impossible to do so, and it is also difficult to add more power plants to existing power plants. This is an unacceptable situation as the amount of discharged water will increase.

In view of the above-mentioned circumstances, this invention makes it possible to make use of the existing waterway as it is, to cope with the situation when the existing power plant is in operation, and to cope with the increase in water discharge from the existing waterway after the expansion of the power plant. It was developed with the aim of dealing with increases in flow velocity.

Before developing the present invention, various experiments were conducted, and the conditions for reducing the flow velocity were that the route should be 50 meters beyond the water outlet, and shallow ships with stagnant waters could pass close to the water outlet. Yes, and in order not to affect navigation, the current speed should be set to 50
"//s or less should be 0 However, there is no need to particularly consider the lower layer near the water outlet. As a countermeasure to obtain the above conditions, if the flow velocity distribution is uneven at the outlet of the water outlet. , I assumed that a high-speed water area would occur and tried to equalize it, but due to the compensation flow from both the left and right banks of the water outlet, large eddy areas were created on both sides of the water outlet. It became clear that as the discharged water flows offshore, the flow area narrows and the flow velocity becomes faster than the expected flow velocity.Therefore, attempts were made to disperse the discharge from the outlet, but there was no inertial force and it was almost impossible to do so. The flow was not dispersed and had no effect at all, and the flow was only on the surface layer and could not be slowed down.

Therefore, the present inventor conducted further research and came up with the present invention, but it was also revealed in the above experiment that the maximum flow velocity due to the uneven flow of the water outlet during water discharge. This will increase the amount by 3 to 4 times, and for this purpose, it is necessary to release the water at the assumed flow rate K at the outlet of the water outlet.

The formula for calculating the flow rate tv+ is V=”/A (1; L is the discharge amount, A
is the original species), so if the discharge amount (Q) is constant, it is sufficient to increase the original species (Al should be increased. However, as mentioned above, the flow rate)
Since it is not possible to significantly increase the number, a solution was considered.

Then, to increase the size of the original species, use the water area in front of the water outlet. However, it was devised to minimize the front water area and widen it so that it does not go offshore as much as possible. An experiment was conducted in which a large number of nozzles were used to release the liquid in a fan-like manner into the lower layers. As a result, it became possible to maintain the flow velocity below the expected level. Therefore, a nozzle that could be put to practical use was needed, and a concrete block was chosen due to its durability, and a block was devised that also took into account the machining surface.

That is, as shown in Figure 1, a pair of left and right main walls (1) (2)
Arrange the partitions so that the spacing becomes narrower from one end to the other, and place a partition wall (3) vertically in the middle of the two walls (1) and (2) in the narrower direction of the two walls (1) and (2). At the same time, a partition me (4) is constructed above the bulkhead (3) at the narrow end of the amphipod am (1) (2),
The nozzle part (5) is located above and below the partition wall (3) between the two walls.
) (6) has been established. In order to prevent the plecks from sliding and falling due to the pressure of flowing water, one main wall (1) is made thicker than the other main wall (2) in consideration of weight distribution.

As shown in Figure 2, the above blocks (B) are attached to the water outlet (7) symmetrically from the center to the left and right, and each nozzle part (5) (6) goes from the center to the side. are arranged so that they are inclined laterally, that is, in a radial manner.

This installation work can be carried out using a crane ship under water spray conditions.

With this arrangement, as shown in FIG. 3, the discharged water dives into the water in the front water area with sufficient inertia through the upper and lower nozzles (5) and (6) of the block. The results of measuring the flow velocity at various locations are shown by the arrows in Figure 2. The thick solid line indicates the surface flow, the dotted line indicates the middle flow, and the thin solid line indicates the bottom flow.
It is a unit of II/S. Furthermore, the outlet of the water outlet (7) that has been implemented is 40 g/s, the water depth is 3 g/s, and the flow rate is 54 g/s. Also, the coordinate lines in the figure are drawn every 20 digits. Then, the discharged water that has passed through the block (Bl) is transferred to the nozzle section (5).
(6), it is accelerated about 5 times to a maximum of 2.2 m/s and released, reaching the sea floor at 6.7 to 8.0 m, but after that it rapidly decays to a value of about 20 to 30 α/S. ,5
At the route boundary (8) with zero snow ahead, the result was 10.203/fj, which was significantly lower than the target of 50txt/s, confirming that the objective had been fully achieved.

As described above, according to the method of the present invention, water is mixed with water from the water outlet and released radially in the horizontal and vertical directions, expanding in the water area in front of the water outlet (within approximately 2Qm in practice). Since it decelerates and is mostly disposed of on the seabed, it does not affect shallow ships passing near the water outlet, and its distribution is mostly decelerated during shipping routes. Since the current is equalized and there is no risk of drifting, it will not affect the navigation of the ship.

Moreover, it is possible to reduce the speed by simply installing blocks, eliminating the need to enlarge the water outlet, which is especially effective when expanding a power plant.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a block used in this invention, FIG. 2 is a plan view showing a water flow situation when the method of this invention is carried out, and FIG. 3 is a sectional view. (Bl...Block, (1) (2)...Main wall, (3)
... Bulkhead, (4) ... Partition wall % (5) (6) ... Nozzle part, (7) ... Water outlet, (8) ... Channel boundary

Claims (1)

[Scope of Claims] 1) A state in which, when water is discharged from the waterway into the water area in front of the water outlet, the water is divided into a large number of streams at the water outlet and accelerated, and each branch stream spreads radially from the water outlet in the horizontal and vertical directions. How to reduce the flow rate of discharged water. 2) The spacing between a pair of opposing main m (1) (2) is arranged narrower from one end to the other end, and the amphibian wall (1) (2)
) with a partition wall (3) in the vertical middle of the amphibian wall (1) <2
) is built at a lower slope in the direction of the narrower side, and the amphibious wall (1
) A partition wall (4) is constructed above the partition wall (3) at the narrow end of (2), and the partition wall (3) is constructed between the amphibian wall (1) and (2).
) A block for reducing the flow velocity of discharged water, which is equipped with nozzle parts (5) and (6) on the upper and lower sides, respectively.