JPS63138992A - Residual-oil recovery device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a residual oil recovery device that efficiently recovers residual oil remaining at the bottom of a cargo tank of a tanker.

(Prior art and problems) Conventionally, in order to collect residual oil remaining at the bottom of a cargo tank, a worker must enter the tank and pump it up using a bucket method, or in the case of hazardous liquid, the method shown in Figure 4 is used. A suction nozzle 21 disposed at the bottom of the cargo tank 20 is connected to a residual oil recovery tank 22 through a pipeline, and an oil or water supply type vacuum pump 23 is connected through a pipeline to the tank 22 to create a vacuum. The residual oil was collected in the residual oil recovery tank 22.

Therefore, if there is a lot of residual oil, the residual oil recovery tank 22
It is necessary to increase the volume of the vacuum pump 23, and accordingly, the displacement of the vacuum pump 23 increases, and its driving force also increases.

In addition, since the residual oil was collected in a liquid state in the residual oil recovery tank 22 at once, the suction height and the vacuum pump 23
Since there is a relationship between the suction capacity and the suction capacity of the vacuum pump 23, a high vacuum pump was selected to increase the suction height.

However, the suction height was still less than tom due to the relationship with the vapor pressure of the liquid, and the practical range was less than 7 m.

As mentioned above, conventional residual oil recovery equipment requires a high vacuum and high displacement vacuum pump, which requires a lot of power, increases costs due to the capacity of the ship's switchboard, and requires less installation space. There were problems such as an increase in

(Means for Solving the Problems) The present invention provides the following features: (a) An air suction port is provided in a suction nozzle for residual oil disposed at the bottom of a tanker cargo tank, and when suctioning residual oil with a vacuum pump, , the residual oil suction ability is increased by the jet flow action of the air sucked in through the suction port.

b) A gas-liquid separation tank is provided in the residual oil recovery pipeline from the suction nozzle to the vacuum pump, and a mesh demister is provided in the tank to enhance the air separation effect of the residual oil stored in the gas-liquid mixed state. Was it.

A level switch is installed that detects high levels of residual oil separated from the air and stops the vacuum pump.

C. A visually visible residual oil level gauge was installed.

(C) A valve with a check valve is provided in the residual oil recovery pipe leading from the gas-liquid separation tank to the strainer, and when the vacuum pump is stopped by the level switch, the valve is manually opened to drain the residual oil into the strainer. At the same time, the level meter recognizes that the residual oil has reached a low level, closes the valve again, and restarts the vacuum pump.

It is in.

(Example) Embodiments of the present invention will be described with reference to the drawings.

As shown in the piping system diagrams in Figures 1 (A) and (B), each suction nozzle 1 installed at the bottom of a plurality of cargo tanks A, B, C, D,... The oil recovery pipes 2 are connected, and each pipe 2 is connected to a common residual oil recovery pipe 3.

The residual oil recovery pipe 3 extended to the pump chamber A residual oil recovery pipe 7 is connected.

Note that 8 and 9 indicate valves and vacuum gauges connected to the residual oil recovery pipe 3.

As shown in FIG. 2, the suction nozzle l has a suction port 1a formed at one end, and a flange 1b connected to the residual oil recovery pipe 2 at the other end.
Cargo tanks A, B, C, and D are located near (approximately 100 mm from the suction port 1a).

An air suction port IC is provided inside.

Note that 1d indicates the ground connection terminal portion, and the dashed line 0 indicates the residual oil level.

Further, as shown in FIG. 3, the gas-liquid separation tank 4 has a flange 4a on the upper side wall to which the residual oil recovery pipe 3 is connected.
A suction pipe 4a having a + is attached, and a discharge pipe 4b having a flange 4b+ to which the residual oil recovery pipe 7 is connected is attached to the lower part of the side wall.

Further, a mesh demister 40 is disposed in the gas-liquid separation tank 4 through which the suction pipe 4a is inserted, and a side wall near the lower surface of the mesh demister 40 has a level for detecting a high level of air-separated residual oil. A level meter 40 is equipped with a switch 4d and allows visual confirmation of the high and low levels of residual oil.
is installed.

Further, a suction pipe 4f having a flange 4f1 is attached to the upper surface of the gas-liquid separation tank 4, and the flange 4f+ has a suction pipe 4f.
As shown in FIG. 1, a pipe line 11 is connected to a dry roots blower 10 disposed in a pump room X.

The dry roots blower 10 is driven by a motor 12 disposed in the engine compartment Y.

Note that 13 indicates a vacuum breaker 114 connected to the pipe line 11 and a silencer connected to the dry roots blower 10.

(Function) When recovering residual oil, (a) Start the motor 12 and start the dry roots blower 1.
Drive 0.

(b) Each cargo tank A, B, C, D...
The residual oil at the bottom (on the residual oil surface indicated by the symbol ○ in Figure 2) is sucked up in a gas-liquid mixed state by the jet flow action of the air sucked in from the air suction port IC of the suction nozzle 1. The residual oil is stored in the gas-liquid separation tank 4 via the suction pipe 4a via the residual oil recovery pipes 2 and 3.

At this time, the air is removed from the suction pipe 4 by the mesh demister-4C.
The residual oil that is sucked into the dry roots blower 10 from the air and separated into air is stored in the gas-liquid separation tank 4.

(C) When the level switch 4d detects that the residual oil in the air separation has reached a high level, the buzzer sounds and the motor 12 is stopped to stop the new Roots blower 10.

(d) Manually open the check valve 5 to drain the residual oil in the gas-liquid separation tank 4 into the strainer 6, and recover it from the strainer 6 into a separately installed recovery tank (not shown).

(e) Visually check that the residual oil has reached a low level using the level meter 40, close the check valve 5 again, restart the motor 12, and drive the dry roots blower 10.

By repeating the above steps, cargo tanks A, B, and C are created.

D. Collect the residual oil in...

Note that the means for sounding the buzzer and stopping the motor 12 by operating the level switch 4d in (C), and the means for restarting the motor 12 in (e) above, use an appropriate electric control circuit. The illustration and description thereof will be omitted.

(effect) The present invention has the following effects.

(a) Since the residual oil is handled in a gas-liquid state, the suction height can be increased to 10 m or more even if the displacement of the vacuum pump is reduced, making dredging of residual oil efficient. In addition, it requires less power and is advantageous in terms of energy saving, and can be manufactured at low cost.

b) Since the residual oil stored in the gas-liquid separation tank is intermittently collected in the strainer, there is no need for a large-volume vacuum tank like in the past, making it possible to save installation space.

[Brief explanation of the drawing]

Figure 1 is a piping system diagram of an embodiment of the present invention.
) is a plan view, (B) is a side view, Figure 2 is a side view of the suction nozzle, Figure 3 is a partially cutaway side view of the gas-liquid separation tank,
FIG. 4 is a schematic explanatory diagram of a conventional example. A, B, C, D... Cargo tank, 1... Suction nozzle, 1c... Air suction port, 4... Gas-liquid separation tank,
4C...Mesh demister-14d...Level switch, 4e...Level meter, 5...Valve with check valve,
10...Dry roots blower-112...Motor.

Claims (1)

[Scope of Claims] A residual oil suction nozzle disposed at the bottom of a tanker cargo tank, a gas-liquid separation tank interposed in a residual oil recovery pipe leading from the suction nozzle to a vacuum pump, and It consists of a valve with a check valve interposed in the residual oil recovery pipe leading from the liquid separation tank to the strainer, and the suction nozzle is provided with an air suction port for sucking in air and increasing the suction ability of residual oil. , the gas-liquid separation tank is equipped with a mesh demister to enhance the gas-liquid separation effect, and a level switch that detects a high level of residual oil stored after air separation and stops the vacuum pump, and a visual checker. A residual oil recovery device, characterized in that it is equipped with a residual oil level gauge.