JPH0669828B2 - Equipment for stirring sludge in crude oil tanks - Google Patents

Description

[Detailed Description of the Invention] In a large tank for storing crude oil, in order to prevent a leak accident, the tank is emptied and cleaned regularly,
They inspected for corrosion and cracks, and repaired any defects found.

When crude oil is stored for a long time, sludge, which is a heavy component, precipitates and accumulates at the bottom.Even if the crude oil in the tank is discharged prior to the inspection, the sludge remains, and the sludge has high viscosity and many solids. Since it is difficult to suck directly with a pump because it is included, its discharge was performed by methods such as chemical dissolution method, hot water washing method, crude oil co-washing method, but the working environment was bad. It was dangerous and costly.

Moreover, since the danger of ignition is extremely high, it is prohibited to use electricity as power, so that there is a limit to the labor saving of the discharging work.

Therefore, the present invention was conceived in order to solve such a problem in sludge discharge, and in particular, a stirrer capable of floating and sinking is put into a tank through a manhole of the tank, and the tank bottom is automatically The sludge is dissolved in the crude oil and discharged together with the crude oil by performing the stirring operation while moving to the next step. Next, detailed description will be given based on the drawings.

As shown in FIG. 1, three or more jet outlets 12a, 12b, 12c directed downward on the peripheral edge of the bottom of the cylinder 11 and an inlet provided at the center of the bottom of the cylinder 11 to the upper part of the cylinder 11. A stirrer 10 capable of floating and sinking, which has a jet pump 13 for sending crude oil to a discharge port provided at the outlet, and as shown in FIG. 2, each jet outlet 12a, 12b, 12c and jet Pump 1
Hose 14a, 14b, 14c, 14d for feeding crude oil to 3 respectively
And a pump 1 and a distribution valve 2 connected via a hose 15 for sucking crude oil in the crude oil tank.

The pump 1 and the distribution valve 2 are installed outside the crude oil tank 9, the pump 1 sucks crude oil through the hose 15, and pumps it to the distribution valve 2, and the distribution valve 2
The ratio of the flow rate distributed to each hose 14a, 14b, 14c, 14d is adjusted.

That is, each jet outlet 12a, 12b of the stirring device 10 capable of floating and sinking,
The flow rate ejected from 12c and the flow rate supplied to the jet pump 13 are adjusted.

The specific gravity of the whole stirrer 10 capable of floating and sinking provided with the jet ports 12a, 12b, 12c and the jet pump 13 is adjusted so that the specific gravity is larger than that of crude oil, and the center of gravity is set to a low value. The float 4 is connected via the chain 3 from the wire 10.

In order to prevent the chain 3 from slackening, the chain 3 is wound around a reel 5 which is given a rotational force by a spring. Even if the stirrer 10 sinks in the crude oil, the float 4 floats right above the stirrer 10. Then, the settling position of the stirring device 10 that is settling can be known.

From the manhole of the crude oil tank 9, into the crude oil of the tank, the stirrer 10 capable of floating and sinking connected by the hoses 14a, 14b, 14c, 14d is put, and when the operation of the pump 1 is started, the hose 15
The crude oil sucked in is jetted downward from each jet outlet 12a, 12b, 12c, stirring the bottom of the tank to dissolve the accumulated sludge into the crude oil, and at the same time jet pump 13
Convection the crude oil upwards to promote agitation.

At this time, when an equal amount of jetting is performed from each of the jet outlets 12a, 12b, 12c, the stirrer 10 capable of floating and sinking is only subjected to an upward reaction and no lateral force is generated, so that the stirrer 10 is in a fixed position. Stir at and stir.

Further, when the flow rate of the crude oil supplied to the jet pump 13 is increased, a downward reaction is generated in the stirrer 10 capable of floating and sinking, and the stirrer 10 is moved down.

When the distribution valve 2 is operated to change the ejection amount of each ejection port 12a, 12b, 12c, the reaction of the ejection port having a large ejection amount becomes strong,
The stirrer 10 tilts to produce a lateral reaction and move laterally.

Further, if a pressure gauge is provided for each hose 14a, 14b, 14c at the outlet of the distribution valve 2, when an obstacle is touched and jetting is hindered, it is known that the obstacle is touched due to an abnormal increase in pressure. be able to. Even if an obstacle is touched, the reaction force in the ejection is strengthened, and the object automatically separates from the obstacle.

Although the embodiment in which the sludge accumulated at the bottom of the crude oil tank 9 is stirred has been described above, the present invention can be applied to a device for stirring and discharging the medley accumulated at the bottom of the seabed or lake.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing an embodiment of an agitator capable of floating and sinking according to the present invention, and FIG. 2 is an apparatus for agitating sludge in a crude oil tank using the apparatus of FIG. It is a schematic diagram showing a state where it is. 1 ... Pump 2 ... Distribution valve 9 ... Crude oil tank 10 ... Floating / sinkable stirring device 12a, 12b, 12c ... Spout 13 ... Jet pump 14a, 14b, 14c, 14d ... Hose

Claims (2)

[Claims] 1. A stirrer that is attached to the bottom and has a plurality of jet ports arranged so as to allow the stirrer to move in a horizontal direction, and is installed outside the crude oil tank, and a stirrer that can float and sink. It is installed outside the distribution valve that adjusts the flow rate of crude oil for each of the above-mentioned jet outlets and supplies it to each of the above-mentioned jet outlets through a hose, and the crude oil tank that sucks crude oil through the hose and pumps it to the above-mentioned distribution valve. And a pump for stirring the sludge in the crude oil tank. 2. A suction port is provided in a pipe line leading from a suction port provided in the center of the bottom of a stirrer capable of floating up and down to a discharge port provided at the upper part, and a jet port for jetting crude oil upward so that the flow rate can be adjusted is provided. A jet pump for sending crude oil from the mouth to the outlet, a float connected to the stirring device via a chain, and a reel around which the chain is wound and to which a rotational force is applied by a spring. An apparatus for stirring sludge in a crude oil tank according to claim 1.