JPS6327830Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention is based on a method in which, after a raw solution containing liquid components of different specific gravities, such as water and oil, is stratified in a separation tank, the light components in the upper layer are skimmed through a unique discharge nozzle. This invention relates to a liquid separation device that can be taken out.

For example, a large amount of ballast water discharged from a tanker contains some amount of waste oil from the ship.
It is not allowed to dump raw water outside, so the ballast water to be treated is once stored in a separation tank where it is stratified and separated into water and oil based on the difference in specific gravity. , the oil is typically removed through a separate discharge nozzle and disposed of.

However, in the conventional structure of the liquid separation device, that is, the skimming device used for the above treatment, the oil is skimmed through a skim opening attached to the center of the floating roof of a cylindrical tank containing raw water, and the oil that is skimmed is , is formed so as to be guided to the oil discharge nozzle via a lift type connecting tube whose lifting degree is variable.

However, in the oil extraction operation of conventional liquid separators with this type of structure, oil is scooped up only from one location near the center of the liquid surface, so oil is scooped out evenly and efficiently over the entire liquid surface of the tank. There was often a problem that the oil could not be separated.

In addition, Japan in particular is an earthquake-prone country, and during an earthquake, the liquid inside the separation tank causes a sloshing phenomenon, causing the liquid level to fluctuate.
It moves in the same way as the liquid moves. Therefore, at this time, the floating roof is strongly deformed and bent due to the sloshing phenomenon, causing an increase in stress such as bending stress on the floating roof, which may cause damage to the floating roof.

The present invention was devised to solve the above-mentioned problems. In other words, the purpose of the present invention is to efficiently collect and separate the light liquid in the upper layer that is stratified due to the difference in specific gravity, and to The object of the present invention is to provide a liquid separation device that is easy to implement in remodeling or new installation.

Hereinafter, the present invention will be explained based on an illustrated embodiment.

The liquid separation device of the embodiment installed in the ballast water treatment process is as shown in Figs. 1 to 4.
It is provided in a tank 1 having a fixed roof and a floating roof F. At one location at the bottom of the side wall of the tank 1 (right side in Figure 2), an inlet nozzle 2 through which treated raw water is sent is fixed horizontally.
The inner end of the inlet nozzle 2 is curved downward, and a rectifier 3 made of a lattice plate with a number of holes 3a is installed horizontally around the opening at the lower end.

In addition, a moisture discharge nozzle 4 is provided horizontally protruding from one location at the bottom of the side wall of the tank (the left side in FIG. 2), and a moisture discharge nozzle 4 is provided on the side wall near the top of the moisture discharge nozzle 4 to prevent water from entering the tank. Horizontally projecting oil discharge nozzle 5
is permanently installed.

Next, at the liquid level WL of the liquid W stored in the tank, there is a first
As shown in the figure, the floating roof F is floating,
This floating roof F has a floating ring-shaped float 7 having a trapezoidal cross section, for example, and the inner space of the float 7 is formed into a plurality of waterproof compartments by partitions 7a. An example is a structure in which a flat roof plate 8 is extended in the central space.

A cylindrical collector 9 of the separation device according to the present invention is fixed to the center of the lower surface of the roof plate 8, and the bottom plate of the collector 9 has an inner part 9a of the collector 9. A leading swivel joint 10 is attached.

Further, a plurality of (five in the figure) skim pipes 12 are radially attached to the lower surface of the roof plate 8 via a plurality of brackets 11, and each skim pipe 1
2 has a large number of skim openings 12a along the longitudinal direction.
are opened, and the centripetal side of each skim tube inner hole opens into the interior 9a of the collector 9 via a flexible hose 13 for buffering.

Finally, an upper connecting tube is formed between the swivel joint 10 of the collector 9 and the swivel joint 6 provided at the inner end of the discharge nozzle 5, with a swivel joint 14 interposed in the middle and connected in a bendable manner. 15 and a lower connecting tube 16, whereby the float 7 is supported by the discharge nozzle 5 so as to be movable up and down.

Here, the operation of the liquid separation device of the embodiment configured as described above will be described.

First, the raw water to be treated is sent into the tank 1 from the inlet nozzle 2, but since a brim-shaped rectifier 3 is arranged at the outlet of the inlet nozzle 2, the incoming raw water flow is pulsating. Most of the vibration pressure generated by the turbulent flow is absorbed by the rectifier 3, so that the component layer in the stored liquid W that has already been stored is not disturbed.

Next, after a certain amount of storage time has elapsed, the stored liquid W is stratified into a lower layer of water and an upper layer of oil by standing still, so if the oil discharge nozzle 5 is then opened,
The oil flowing into the pipe from the numerous skim ports 12a of each skim pipe 12 of the separator according to the present invention over the entire surface of the liquid surface WL flows through the upper and lower connecting tubes 15, 1.
6 and discharge nozzle 5, and is taken out to the outside.

As the float 7 descends, the entire amount of oil in the upper layer is discharged and when moisture is detected in the liquid discharged from the oil discharge nozzle 5, the oil discharge nozzle 5 is closed and the moisture discharge nozzle 4 is closed. The bottom layer of water is removed and disposed of.

By performing such operations continuously or repeatedly, a large amount of raw water can be disposed of extremely efficiently based on the skimming operation at a high flow rate from the entire liquid level WL in a stationary state.
That is, since components with light specific gravity are collected through each radial skim pipe 12, components with light specific gravity are collected in a stationary state without causing disturbance to the stored liquid W at a small flow rate over the entire surface of the roof plate 8 of the floating roof F. Only the components can be separated and collected from raw water extremely efficiently.

In addition, a bracket 1 is attached to the bottom surface of the floating roof F roof plate 8.
Since the structure is such that a plurality of skim pipes 12 are fixed radially through the skim pipes 1, the device of this invention can be easily installed not only in the tank 1 described above but also in existing tanks. This not only makes it possible to perform stationary oil/water separation using a pipe (with a diameter of several tens of meters), but also reduces the bending stress caused by the sloshing phenomenon inside the tank 1 during an earthquake, allowing each skim pipe 12 to serve as a reinforcing member for the floating roof F. The seismic strength of the floating roof F can be increased.

Note that the rectifier 3 in the tank configuration described above
In place of the lattice plate 3, as shown in FIGS. 5 and 6, a rectifier tube 17 of a rectifying cup type floating upward from the bottom of the tank 1 may be used. The inner end of the nozzle 18 is opened into the rectifying cylinder 17, and the rectifying cylinder 17
A large number of rectifying holes 17 having a total area approximately equal to or larger than the passage area of the raw water feed nozzle are provided on the upper plate.
A is opened, thereby slowing down the flow of raw water. Further, the present device may be attached to the floating roof of a floating roof cylindrical tank such as one in which the fixed roof 1a attached to the tank 1 has been removed.

In addition, the separation operation of the embodiment is equally effective when treating liquid components that have different specific gravities and do not interact with each other, in addition to the above-mentioned mixed liquid of water and oil. is obtained.

The effects of the present invention are as follows.

That is, in the present invention, light liquid is collected through a plurality of skim pipes each having one end connected to a collector installed on the underside of the floating roof and having a large number of skim ports. The light liquid is sampled at a low flow rate to prevent unnecessary disturbance of the liquid stored in the tank, and the liquid separation device as a whole can secure an appropriate sampling flow rate (sampling time), and is extremely efficient in determining specific gravity. The light liquid can be separated and removed by statically stratifying a mixture of different liquids.

In addition, the collector is installed on the underside of the roof plate of the floating roof, and a plurality of skim pipes, one end of which is connected to the collector, are attached to the roof plate via a plurality of brackets along the underside of the roof plate. Installation work is easy, and it is extremely easy to implement when modifying existing tanks or building new tanks.

In particular, when modifying an existing floating roof tank, there are very few parts to modify the tank itself.
In addition, each skim pipe serves as a reinforcing member for the roof plate, eliminating the need for tank reinforcement work associated with remodeling work, and the remodeled parts can be manufactured in advance at the factory, significantly shortening the remodeling period. , site modification work can be completed extremely easily.

[Brief explanation of the drawing]

FIG. 1 is a front sectional view of a liquid separation device showing an embodiment of the present invention, FIG. 2 is a plan sectional view taken along the line - in FIG. 1, and FIG. 3 is a partial plane view taken along the arrow in FIG. 4 is a partial sectional view taken along the - line in FIG. 2, FIG. 5 is a plan view of the rectifier of the tank, and FIG. 6 is a sectional view of the same side. WL...liquid level, 1...tank, 2, 18...feeding nozzle, 4...moisture discharge nozzle as heavy component, 5...oil discharge nozzle as light component, 7...
...Float, 8... Roof plate, 9... Collector, 12
...Skim pipe, 12a ...Skim port, 15, 16
...Connection tube, F...Floating roof.

Claims (1)

[Scope of Claim for Utility Model Registration] A floating roof provided in a tank and having a float formed on the outer periphery of a flat roof plate, a collector provided on the lower surface of the roof plate, and one end of the collector A plurality of skim pipes are connected to each other and are attached to the roof plate along the lower surface of the roof plate via a plurality of brackets, and are provided with a number of skim ports in the longitudinal direction, and a light pipe provided in the tank. A liquid separation device comprising: a connecting tube that connects the inner end of a liquid discharge nozzle and the collector, and an elevating type connecting tube whose degree of elevation is variable.