JPH08243519A - Cleaning device for residual oil in tank - Google Patents

Abstract

PURPOSE: To almost prevent sludge from being stuck to a bellmouth to improve suction action by installing a steam pipe for jetting steam for melting sludge and a fluid heating pipe for heating sludge under the bottom surface of the bellmouth just in front of an impeller. CONSTITUTION: When cleaning residual oil in a tank 1, a cleaning device is inserted into the tank 1. First the 1st steam valve 23 is opened to introduce high temperature and high pressure steam from a steam supply main pipe 22 into a steam pipe 24, and the steam is jetted from a steam jetting nozzle 25 to pulverize and melt sludge 3. At the same time, the impeller 6 is rotated to scrape off the sludge 3 on a tank bottom surface 2. Next the 2nd steam valve 34 is opened to introduce high temperature and high pressure steam into a fluid heating pipe 28, and a bellmouth 11 is heated to heat the sludge 3, and also a suction flow of the bellmouth 11 is improved. Further, steam is fed to the bellmouth 11 from a steam outlet riser part, an outlet pipe 32 and a steam jetting nozzle 33 to more improve the suction flow.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for cleaning residual oil in a tank, and more particularly to an apparatus for cleaning residual oil at the bottom of a tank when the tank is opened.

[0002]

2. Description of the Related Art A conventional cleaning device of this type is, for example,
It is configured as described in JP-A-6-142626. That is, the outline is shown in FIG. 3 and FIG.
Will be described. In the figure, 1 is a tank, 2 is its bottom plate, and 3 is sludge remaining on the bottom plate 2. Further, 4 is a moving body which is a self-propelled trolley that has a hydraulic motor or the like as a drive source and runs on the bottom plate 2, and 5 is the moving body 4.
Is attached to the front part of the cover and is open at the front and the bottom (covers the upper side, both sides, and the rear side), 6 is an impeller described later, 7 is a hydraulic motor for rotationally driving the impeller 6,
8 is a processing liquid supply hose, 9 is a swivel joint, 10
Is a molten sludge suction pipe attached to the moving body 4, 11
Is a bell mouth connected to the tip of the suction pipe 10 and appropriately positioned behind the impeller 6, 12 is a pump mounted on the carriage 4 and connecting the suction pipe 10 to a suction port, Reference numeral 13 is a molten sludge discharge pipe connected to the discharge port of the pump 12.

In this example, the moving body 4 is designed to be capable of wirelessly controlling speed control and steering, and the control unit 14 is provided in the moving body 4. Further, as the treatment liquid for crushing and melting the sludge 3, hot oil or the like of the same type as the sludge 3, that is, co-oil may be used, but in this example, since high temperature and high pressure water is used as the treatment liquid, As shown in FIG. 4, an oil / water separator 15 is provided outside the tank 1 on the downstream side of the molten sludge discharge pipe 13, and a heater 16 for raising the temperature of the water separated by the separator 15, and this heater The high-temperature water heated in 16 is supplied with the treatment liquid supply hose 8
And a booster pump 17 for returning to.

Reference numeral 18 shown in FIG. 3 is a drive belt provided between the rotary shaft of the hydraulic motor 7 and the hollow axle of the impeller 6.

The impeller 6 comprises a hollow axle 19 and a large number of blades 20 attached to the hollow axle 19. A belt pulley 21 is attached to one end of the axle 19 and both ends of the axle 19 are adjacent to each other. Are rotatably supported by bearings provided on the cover 5, respectively. Also hollow shaft 19
And the processing liquid supply hose 8 are connected via a swivel joint 9.

In the residual oil cleaning device for a tank constructed as above, the cleaning device is put into the tank 1 when the tank 1 is opened. Then, the impeller 6 is rotated to scrape off the sludge 3 on the bottom plate 2 of the tank 1, and at the same time, high-temperature high-pressure water having a temperature equal to or higher than the pour point of the base oil of the sludge as the treatment liquid is fed from the treatment liquid supply hose 8 to the impeller. 6 hollow axles 1
9 to the sludge 3 from the treatment liquid from the blade 20 by pressure feeding.
And sludge 3 is crushed and melted,
The sludge adhered to the blade 20 is washed off.

Subsequently, the pump 1 mounted on the moving body 4
2 is driven, and the sludge subjected to the crushing and melting treatment is sucked by the bell mouth 11 of the molten sludge suction pipe 10, and is discharged from the molten sludge discharge pipe 13 to the oil / water separator 15 provided outside the tank 1. Then, the oil / water separator 15 separates the oil / water, and the water portion is heated to a temperature higher than the above temperature by the steam heater 16, pressurized by the booster pump 17, returned to the treatment liquid supply hose 8 and circulated.

In this way, this operation is repeated while moving the moving body 4 forward on the bottom plate 2 of the tank 1.

[0009]

However, in the above-described conventional residual oil cleaning device for a tank, high-pressure high-temperature water is injected to melt residual oil sludge.
In the case of high-viscosity oil of 1 million cp (centipoise) or more, there is a problem that residual oil sludge is difficult to dissolve in high-pressure high-temperature water, and if a part that does not dissolve adheres to the bellmouth 11, the suction action is poor. There was a problem that

The present invention is intended to solve such a problem. That is, an object of the present invention is to provide a residual oil cleaning device in a tank that can dissolve sludge even in high-viscosity oil, hardly adheres to bellmouths, and improves suction action. To do.

[0011]

In order to achieve the above object, the present invention provides a moving body which moves on a bottom plate of a tank,
A cover attached to the front portion of the moving body and open to the front and the lower side, an impeller rotatably supported inside the cover to scrape off sludge, and a tip portion attached to the moving body to A molten sludge suction pipe located behind the impeller and having a bell mouth at its tip, and a pump mounted on the moving body and connecting the suction pipe to a suction port,
In a residual oil cleaning device in a tank provided with a sludge discharge pipe connected to a discharge port of the pump, steam which is mounted on the moving body and which ejects steam for melting sludge just in front of the impeller. A tube and a fluid heating tube fitted to the bottom of the bell mouth to heat the sludge under the bottom are provided.

[0012]

According to the present invention, the movable body which moves on the bottom plate of the tank, the cover which is attached to the front portion of the movable body and which is open at the front and the lower side, are rotatable inside the cover. An impeller that is supported and scrapes sludge; a molten sludge suction pipe that is attached to the moving body and has a tip portion located rearward of the impeller and that has a bell mouth at the tip portion; and is mounted on the moving body. And a sludge discharge pipe connected to the discharge port of the pump, and a sludge discharge pipe connected to the discharge port of the pump. A steam pipe for ejecting steam that melts sludge is provided immediately before the impeller, and a fluid heating pipe that is fitted into the bottom of the bell mouth and heats the sludge under the bottom of the bell mouth. Tank cleaning device Put in. Then, high-temperature high-pressure steam is ejected from the steam pipe toward the sludge in front of the impeller to melt it, and the impeller is rotated to scrape off the sludge on the bottom plate of the tank. A heat source fluid is passed through a fluid heating tube fitted to the bottom of the bell mouth to heat the sludge under the bottom of the bell mouth. Next, the pump mounted on the moving body is driven, and the sludge that has been pulverized and melted is sucked by the bell mouth of the molten sludge suction pipe and discharged from the molten sludge discharge pipe to the oil / water separator provided outside the tank. .

[0013]

1 is a partially cutaway side view showing an embodiment of the present invention, and FIG. 2 is a sectional plan view taken along the section line A--A of FIG. In FIG. 1, reference numerals 1 to 7 and 10 to 1
3, 15 to 18 are the same as the conventional ones shown in FIGS.

In FIG. 1, 22 is a main steam supply pipe mounted on the moving body 4, 23 is a first steam valve, and 24 is a main steam valve.
Is a steam pipe which is mounted on the moving body 4 and which jets steam for melting the sludge 3 immediately in front of the impeller 6, 25 is a steam injection nozzle attached to the lower end of the steam pipe 24, 26
Is the bottom surface of the bell mouth 11. Further, in FIGS. 1 and 2, reference numeral 27 denotes a horizontal arcuate groove 28 having a horseshoe-shaped cross section formed on the bottom surface 26 of the bell mouth 11.
Is a fluid heating tube fitted in the groove 27 to heat the bottom surface 27 and heat the sludge therebelow.

That is, hot water may be passed through the fluid heating pipe 28, but in this embodiment, the steam main pipe 22 is used.
It is designed to pass high-temperature, high-pressure steam from.

The fluid heating pipe 28 is the main steam supply pipe 22.
To the steam inlet descending portion 29, which is an inflow tip connected in a branched manner via the second steam valve 34, and a horizontal ring-shaped portion 30 which is fitted into the groove 27 as shown in FIG. And a steam outlet rising portion 31, and further has an outlet pipe 32 and a steam injection nozzle 33 which is an outflow front end as seen in FIG.

The fluid heating tube 28 is used for the bell mouth 1
In view of the fitting of the bottom surface 26 of No. 1 into the groove 27 and the assembly for allowing the heating fluid to pass smoothly, the steam inlet descending portion 29
Although not shown in the figure and the steam outlet rising portion 31,
Each has a union type pipe joint.

In the residual oil cleaning device for a tank constructed as shown in FIGS. 1 and 2, the cleaning device is put in the tank when the tank is opened. Then, the first steam valve 23 is opened, high-temperature high-pressure steam from the steam supply main pipe 22 is introduced into the steam pipe 24, and is injected from the steam injection nozzle 25 toward the sludge 3 to crush and melt the sludge 3, The impeller 6 is rotated to scrape off the sludge 3 on the bottom surface 2 of the tank. Further, the second steam valve 34 is opened to introduce high-temperature high-pressure steam into the fluid heating pipe 28 to heat the bell mouth 11, and the sludge adhering to the bell mouth 11 and the sludge under the bottom surface 26 are heated. Improves the suction flow of 11. Moreover, the steam introduced into the fluid heating pipe 28 passes through the steam outlet rising portion 31 and the outlet pipe 3
From 2 to the steam jet nozzle 33, the steam is jetted near the outside of the bell mouth 11 from here, and the flow of suction of the bell mouth 11 is further improved.

1 and 2, the first steam valve 23 is closed, the second steam valve 34 is opened, and the outlet pipe 3 is opened.
The third steam valve 37 provided in the connecting pipe 36 that connects the steam pipe 24 with the steam pipe 24 is opened, and thus the steam is supplied to the steam supply main pipe 22 → the steam inlet descending portion 29 → the horizontal ring-shaped portion 30.
→ It may flow from the steam outlet rising portion 31 to the outlet pipe 32 → the steam injection nozzle 33, and may flow from the rising portion 31 to the connecting pipe 36 → the steam pipe 24 → the steam nozzle 35.

In parallel with the rotation of the impeller 6, the pump 12
Is driven by the bell mouth 11 of the molten sludge suction pipe 10 to suck the sludge subjected to the crushing and melting treatment, and discharge the sludge from the molten sludge discharge pipe 13 to the oil-water separator 15 outside the tank. The oil separated by the oil / water separator 15 is recovered by a recovery device (not shown), and the separated water is heated by the steam heater 16 and boosted by the boosting pump 17 to flow through the return pipe 35 as shown in FIG. Since it is returned as high-temperature and high-pressure water to the vicinity of the outside of the bell mouth 11, the heating of the bell mouth 11 is also assisted by this.

This operation is repeated while moving the moving body 4 forward on the bottom plate 2 of the tank 1 in this manner.

[0022]

As described above, according to the present invention,
A moving body which moves on the bottom plate of the tank, and a cover which is attached to the front part of the moving body and whose front and lower sides are open,
An impeller rotatably supported inside the cover to scrape off sludge, and a molten sludge suction tube attached to the movable body and having a tip portion located rearward of the impeller and having a bell mouth at the tip portion. And a pump for mounting the suction pipe on the moving body and connecting the suction pipe to the suction port, and a sludge discharge pipe connected to the discharge port of the pump for cleaning residual oil in a tank, A steam pipe that is mounted on the moving body and that ejects steam that melts sludge immediately in front of the impeller, and a fluid heating pipe that is fitted to the bottom surface of the bell mouth and heats the sludge under the bottom surface are provided. Since the fluid injected to melt and pulverize the residual oil in the tank can be high-temperature high-pressure steam instead of the conventional high-temperature high-pressure water, the enthalpy can be compared by comparing the mass etc. under the same conditions. Dozens And large, and therefore 1,000,000 cp
Even in the case of the above high viscosity oil, the sludge can be easily melted, and by passing the heating fluid through the fluid heating tube fitted in the bottom of the bell mouth, the bell mouth is heated and the sludge to the bell mouth is heated. There is almost no adhesion of ss and the suction action is improved.

[Brief description of drawings]

FIG. 1 is a partially cutaway sectional side view showing an embodiment of the present invention.

2 is a cross-sectional plan view taken along the section line AA of FIG.

FIG. 3 is a partially cutaway sectional side view showing an example of a conventional technique.

FIG. 4 is a plan view of FIG. 3.

[Explanation of symbols]

 1 Tank 2 Bottom Plate 3 Sludge 4 Moving Body 5 Cover 6 Impeller 10 Molten Sludge Suction Pipe 11 Bellmouth 12 Pump 13 Molten Sludge Discharge Pipe 15 Oil Water Separator 16 Steam Heater 24 Steam Pipe 26 Bottom of Bellmouth 27 Cross Section Horse-shaped Horizontal circular groove 28 Fluid heating pipe 35 Return pipe

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshinari Sotoyama 3-15-15 Toyosu, Koto-ku, Tokyo Ishikawajima Harima Heavy Industries Co., Ltd. Toni Technical Center (72) Inventor Hideo Ozone 1-chome, Uchisaiwai-cho, Chiyoda-ku, Tokyo No. 1 to 3 in Tokyo Electric Power Company

Claims (4)

[Claims] 1. A moving body that moves on a bottom plate of a tank,
A cover attached to the front portion of the moving body and open to the front and the lower side, an impeller rotatably supported inside the cover to scrape off sludge, and a tip portion attached to the moving body to A molten sludge suction pipe located behind the impeller and having a bell mouth at its tip, and a pump mounted on the moving body and connecting the suction pipe to a suction port,
In a residual oil cleaning device in a tank provided with a sludge discharge pipe connected to a discharge port of the pump, steam which is mounted on the moving body and which ejects steam for melting sludge just in front of the impeller. A residual oil cleaning device in a tank, comprising: a pipe; and a fluid heating pipe fitted into the bottom surface of the bell mouth to heat sludge under the bottom surface. 2. The tank according to claim 1, wherein the fluid heating pipe fitted on the bottom surface of the bell mouth is a steam pipe, and the fluid heating pipe is connected to a steam pipe for ejecting steam for melting the sludge. Residual oil cleaning device. 3. An oil / water separator and a steam heater are provided at the discharge end of the sludge discharge pipe, and a return pipe is provided for returning the high temperature water heated by the heater to the vicinity of the outside of the bell mouth. 1. The residual oil cleaning device in the tank according to 1. 4. The fluid heating pipe fitted on the bottom surface of the bell mouth is a steam pipe, and the inflow end of the fluid heating pipe is connected to a steam pipe for ejecting steam that melts the sludge, and the outflow end is The residual oil cleaning device in the tank according to claim 2, wherein the residual oil cleaning device is located near the outside of the bell mouth.