WO2009028519A1

WO2009028519A1 - Oil sludge weight reducing apparatus

Info

Publication number: WO2009028519A1
Application number: PCT/JP2008/065225
Authority: WO
Inventors: Tatsuhiko Minami
Original assignee: System Kikou Co., Ltd.
Priority date: 2007-08-24
Filing date: 2008-08-20
Publication date: 2009-03-05
Also published as: JP5302889B2; JPWO2009028519A1

Abstract

An oil sludge weight reducing apparatus characterized by including a screw composed of a screw axle with a steam supply hole and a screw vane helically provided around the outer circumference of at least a portion of the screw axle; an inner tube with oil water passage hole provided so as to surround the screw; an outer tube disposed outside the inner tube so as to provide an oil water discharge interstice between the same and the inner tube; an oil sludge supply port for supply of oil sludge in the inner tube; an outer-tube-side steam supply port for supply of steam in the outer tube; a stopper disposed in the vicinity of the edge of the inner tube on a residue discharge side so as to provide a residue discharge interstice between the same and the edge of the inner tube on a residue discharge side; an oil water discharge port for discharge, outside the apparatus, of the oil water having been discharged in the oil water discharge interstice; and driving means for rotary drive of the screw, wherein the ratio of the length from the edge of the inner tube on an oil sludge supply side to the outer-tube-side steam supply port to the length of the inner tube is 0.5 or below. The oil sludge weight reducing apparatus would attain reduction of the amount of oil and hazardous substances contained in oil sludge to the level allowing landfill disposal by a one-step operation.

Description

2008/065225 Description Oil-impregnated sludge reduction equipment Technical Field

The present invention relates to an oil-impregnated sludge reduction device for separating and reducing oil content and harmful substances from oil-containing sludge such as crude oil sludge and crude oil drilling mud. Background art

When crude oil is stored in a tank, the wax content and alfalten content in the crude oil are deposited, and these are also decomposed products generated by the decomposition of microorganisms such as moisture in the crude oil, iron rust mixed in the crude oil, sand and mud. As the sludge is mixed with sludge and settles, sludge containing oil accumulates at the bottom of the crude oil tank. Such sludge is generally called crude oil sludge. In addition, when oil is excavated, oil-containing sludge that resembles crude oil sludge is generated. Such sludge is generally called a drilling mat. Further, the crude oil sludge and the excavation mud contain trace amounts of harmful substances such as water-soluble mercury.

Conventionally, such oil-containing sludge is disposed of in the case of crude oil sludge with a large amount of oil. After the crude oil sludge is subjected to an intermediate treatment and centrifuged, the oil content is reduced from the crude oil sludge and then incinerated. In addition, in the case of crude oil sludge drilling mud with low oil content, the crude oil sludge or drilling mud was centrifuged, and the oil content decreased after roughly separating the oil content from the crude oil sludge or drilling mud. Oil is removed by incineration of oil-impregnated sludge, and then the residue with reduced oil content is removed. It has been done by landfill.

From the viewpoint of environmental impact, in order to dispose of residue in landfills, the content of oil and harmful substances in the residue must be below the criteria for landfill disposal. However, only intermediate treatment and centrifugation cannot reduce the content of oil and hazardous substances in the residue below the criteria for landfill disposal. Later, incineration of oil-containing sludge was essential.

For this reason, conventional oil-containing sludge disposal methods perform two- and three-stage operations such as centrifugation and incineration, or intermediate treatment, centrifugation and incineration, resulting in increased processing costs and equipment space. The problem was that Therefore, it is desired to develop a device that can reduce the amount of oil in the oil-containing sludge to a level that can be disposed of by landfill in a single operation.

Accordingly, an object of the present invention is to provide a device for reducing the amount of oil-containing sludge that can reduce the content of oil and harmful substances in the oil-containing sludge to an amount that can be disposed of in landfill in a single operation. is there. Disclosure of the invention

As a result of diligent research to solve the above-described problems in the prior art, the present inventor squeezed the oil-containing sludge while supplying water vapor using a screw press type squeezing device. In addition, by setting the supply position of the water vapor within a specific range, the oil content and harmful substance content in the oil-containing sludge can be reduced satisfactorily in a single operation, and the pitch of the screw blades can be specified. By making it within the range, it is suitable for squeezing for a long time, and further, it has been found that the effect of reducing the weight is enhanced, and the present invention has been completed. That is, the present invention (1) includes: a screw shaft having a water vapor supply hole; and a screw comprising a screw blade provided in a spiral shape on the outer periphery of at least a part of the screw shaft;

An inner cylinder having an oil-water passage hole and surrounding the screw;

An outer cylinder that is installed outside the casing, and that forms an oil-water discharge gap with the inner cylinder;

An oil-impregnated sludge supply port for supplying oil-containing sludge into the inner cylinder, an outer cylinder-side steam supply port for supplying water vapor into the outer cylinder, and a vicinity of the cylinder end on the residue discharge side of the inner cylinder A stopper that forms a residue discharge gap between the inner cylinder and the cylinder end on the residue discharge side of the inner cylinder;

An oil water discharge port for discharging the oil water discharged into the oil water discharge gap to the outside of the device;

Drive means for rotationally driving the screw;

Have

The ratio of the length of the inner cylinder from the cylinder end on the oil-impregnated sludge supply side to the outer cylinder-side water vapor supply port with respect to the length of the inner cylinder is 0.5 or less,

An oil impregnated sludge reduction device characterized by the above is provided.

Further, the present invention (2) is characterized in that the ratio of the pitch of the screw blade to the diameter of the screw blade is 0.5 to 1.25, wherein the oil impregnation according to the present invention (1) is provided. An apparatus for reducing sludge is provided. Further, the present invention (3) is characterized in that the stopper is a stopper through which the screw shaft is passed, slidably attached to the screw shaft, and a pressure adjusting member attached to the back surface. The present invention provides a device for reducing the amount of oil-containing sludge described in the present invention (1). According to the present invention, the oil-containing sludge that can reduce the content of oil and harmful substances in the oil-containing sludge to an amount that can be disposed by landfill in one stage of operation. Brief Description of the Drawings

FIG. 1 is a schematic cross-sectional view of the oil-impregnated sludge reduction device of the present invention when cut along a plane parallel to the direction of movement of the oil-containing sludge, and FIG. 2 shows the direction of movement of the oil-containing sludge. FIG. 3 is a schematic cross-sectional view of the oil-impregnated sludge weight reducing device of the present invention when cut along a plane perpendicular to FIG. 3, and FIG. 3 is a side view of the screw in FIGS. 1 and 2. Fig. 4 is a cross-sectional view showing the inner cylinder and the outer cylinder of Fig. 1, and Fig. 5 shows how the oil-containing sludge is processed using the oil-containing sludge reduction device 1 1 is a schematic cross-sectional view of the oil-retaining sludge reducing device 1. FIG. BEST MODE FOR CARRYING OUT THE INVENTION

An oil-impregnated sludge reduction device according to the present invention comprises: a screw shaft having a steam supply hole; and a screw comprising a screw blade spirally provided on the outer periphery of at least a part of the screw shaft;

An inner cylinder having an oil-water passage hole and surrounding the screw;

An outer cylinder that is installed outside the inner cylinder and forms an oil-water discharge gap with the inner cylinder;

An oil-containing sludge supply port for supplying oil-containing sludge into the inner cylinder, an outer cylinder-side water vapor supply port for supplying water vapor into the outer cylinder,

A stopper installed in the vicinity of the cylinder end of the inner cylinder on the residue discharge side, and forming a residue discharge gap between the inner cylinder and the cylinder end of the inner cylinder on the residue discharge side;

Drive means for rotationally driving the screw; Have

The oil-impregnated sludge reducing device has a ratio of a length from a cylinder end of the inner cylinder on the oil-impregnated sludge supply side to the outer cylinder-side steam supply port to a length of the inner cylinder of 0.5 or less. In the oil-impregnated sludge reduction device of the present invention, the oil, sludge and moisture in the oil-containing sludge, and the supplied water vapor are discharged into the oil water discharge gap by treating the oil-containing sludge. Condensed water is discharged, but in the present invention, all the oil, harmful substances and moisture in the oil-containing sludge, and the water condensed from the supplied water vapor are all discharged into the oil water discharge gap. Items are described as “oil / water”.

The oil-impregnated sludge reduction device of the present invention will be described with reference to FIGS. 1 and 2 are schematic cross-sectional views of the oil-impregnated sludge reduction device of the present invention, and FIG. 1 is a cross-sectional view taken along a plane parallel to the moving direction of the oil-containing sludge. Fig. 2 is a cross-sectional view of the oil-containing sludge cut along a plane perpendicular to the moving direction. FIG. 3 is a side view of the screw in FIGS. 1 and 2. FIG. 4 is a cross-sectional view showing the inner cylinder and the outer cylinder of FIG. In FIG. 1 and FIG. 2, the oil-impregnated sludge reducing device 1 includes a screw 4, an inner cylinder 5 surrounding the screw 4, an outer side of the inner cylinder 5, and the inner cylinder 5. An outer cylinder 6 installed in such a manner that an oil-water discharge gap 2 2 is formed in the inner cylinder 5, a stopper 7 installed in the vicinity of the cylinder end 18 on the residue discharge side of the inner cylinder 5, and the inner cylinder 5 And an oil-impregnated sludge supply side flange 8 installed on the oil-impregnated sludge supply side of the outer cylinder 6, and a residue discharge chamber 14 formed on the residue discharge side of the inner cylinder 5 and the outer cylinder 6 Residue discharge side flange 9, oil-impregnated sludge supply port 10 for supplying oil-impregnated sludge into the inner cylinder 5, and outer cylinder-side steam supply port for supplying water vapor into the outer cylinder 6 1 1 and the residue discharge chamber 1 4 and the residue discharge port 1 2 for discharging the residue from the apparatus to the outside of the apparatus, and the oil water discharge gap

Five An oil / water discharge port 13 for discharging the oil / water discharged to the outside of the apparatus 13 and an exhaust port 16 for discharging the gas in the outer cylinder 6 to the outside of the apparatus are provided. As shown in FIG. 3, the screw 4 includes a screw shaft 2 and screw blades 3. The screw blade 3 is spirally provided on the outer periphery of at least a part of the screw single shaft 2. The screw shaft 2 is rotatably fixed to the oil-containing sludge supply side flange 8 and the residue discharge side flange 9.

The screw shaft 2 is a hollow tube, and one end 28 of the screw shaft 2 is opened to supply water vapor into the tube of the screw shaft 2, while the screw shaft 2 The other end 29 of the shaft 2 is sealed. The shaft wall of the screw shaft 2 is formed with a water vapor supply hole 27 for discharging water vapor from the space inside the shaft to the outside of the shaft. The water vapor supply hole 27 is a water vapor supply hole for supplying water vapor to the oil-impregnated sludge in the inner cylinder 5 from the screw shaft 2 side, that is, from the center of the inner cylinder 5 to the outside. is there.

The diameter of the water vapor supply hole 27 is appropriately selected depending on the size of the residue in the oil-containing sludge to be treated, but is usually 5 to 12 mm, preferably 8 to 12 mm, particularly preferably 8 to 1. Omm. In FIG. 3, the range 24 in which the water vapor supply hole 27 is formed is selected as appropriate, but normally, the oil-impregnated sludge supply side is close to the oil-impregnated sludge supply-side flange 8, and normally The residue discharge side is the ratio of the length of the range 24 in which the water vapor supply hole 2 7 is formed to the length of the portion 23 surrounded by the inner cylinder 5 (reference numeral 24 Z code 2 3) force S 0.5 to 0.8 6 6, preferably 0.6 6 to 0.8 6 6, particularly preferably 0.7 6 to 0.8 6 6. Ratio of the length of the range 24 in which the water vapor supply hole 27 is formed to the length of the portion 23 surrounded by the inner cylinder 5 (reference numeral 24 / reference numeral 23) 1S Beyond the range, the amount of water in the residue tends to increase. The number of water vapor supply holes 27 is appropriately selected depending on the type of oil-containing sludge, the scale of the apparatus, and the like.

The screw blade 3 is formed in a spiral shape on the outer periphery of the screw shaft 2, and when the screw 4 rotates, the oil-containing sludge in the inner cylinder 5 is discharged from the oil-containing sludge supply side. The shape is not particularly limited as long as it can be moved to the side.

The diameter 25 of the screw blade 3 may be the same length as the inner diameter of the inner cylinder 5 or may be slightly smaller than the inner diameter of the inner cylinder 5. When the diameter 25 of the stationary blade 3 is smaller than the inner diameter of the inner cylinder 5, the clearance between the screw blade 3 and the inner cylinder 5 is usually 1 mm or less, preferably 0.5 mm or less, especially Preferably it is 0.1 mm or less.

The ratio of the pitch 26 of the screw blade 3 to the diameter 25 of the screw blade 3 (reference numeral 26 / reference numeral 25) is 0.25 to 1 · 25. In addition, since it becomes easy to slow down the moving speed of the oil-containing sludge, in other words, it is easy to lengthen the pressing time of the oil-containing sludge, so that the effect of reducing the oil content in the oil-containing sludge is increased. The ratio of the pitch 26 of the screw blade 3 to the diameter 25 of the screw (code 26 Z symbol 25) is preferably 0.5 to 1.25, particularly preferably 0.75 to: I More preferably, it is 0.9 to 1. In the present invention, the pitch 26 of the screw blade 3 is the distance between the apexes 26 1 a and 26 1 b of the screw blade in FIG. 3, that is, the screw blade 3 is viewed from the side. This is the distance between the apexes of adjacent feathers.

The pitch 26 of the screw blade 3 may be the same or different over the entire range of the screw blade 3.

In the present invention, the shape of the screw 4 is as shown in FIGS. The shape is not limited to the shape shown in Fig. 1. Other examples include those with a larger screw shaft diameter toward the residue discharge side and those with a smaller pitch toward the residue discharge side. Can be mentioned.

The inner cylinder 5 has a cylindrical shape. A cylinder end 19 on the oil-impregnated sludge supply side of the inner cylinder 5 is fixed to the oil-impregnated sludge supply-side flange 8, and the cylinder end 19 is closed by the oil-containing sludge supply-side flange 8. On the other hand, the cylinder end 18 on the residue discharge side of the inner cylinder 5 is fixed to the residue discharge side flange 9, and the opening of the cylinder end 18 is connected to the residue discharge chamber 14. ing. That is, the tube end 18 is opened so that the residue is discharged out of the inner tube.

An oil water passage hole is formed on the cylindrical wall of the inner cylinder 5 so that the oil water separated from the oil containing sludge is discharged from the casing 5 to the oil water discharge gap 22 2 by squeezing the oil containing sludge. (Not shown) is formed.

The cylindrical wall of the inner cylinder 5 is not particularly limited as long as the oil water passage hole is formed. Examples of the cylindrical wall of the inner cylinder 5 include holes such as a wire mesh and a punching metal. Punched plate material, screen wire mesh, etc. are listed.

The diameter of the oil water passage hole formed in the cylindrical wall of the inner cylinder 5 is appropriately selected depending on the size of the residue in the oil-containing sludge to be treated, but usually 0.76 to: 1. It is 96 mm, preferably 1.40 to 1.74 mm, particularly preferably 1.53 to 1.63 mm. When the cylinder wall of the inner cylinder 5 is a wire mesh, the diameter of the oil water passage hole indicates the opening length of the wire mesh, and when the cylinder wall of the inner cylinder 5 is a punching metal, The diameter of the oil / water passage hole is the diameter of the punched hole.

Oil-containing sludge is squeezed between the inner wall of the inner cylinder 5 and the screw blade 4 by being installed so as to surround the inner cylinder 5 and the screw 4. A squeezing space 17 is formed.

The outer cylinder 6 has a cylindrical shape. A cylinder end 20 on the oil-impregnated sludge supply side of the outer cylinder 6 is fixed to the oil-impregnated sludge supply-side flange 8, and the cylinder end 20 is closed by the oil-containing sludge supply-side flange 8. On the other hand, the cylinder end 21 on the residue discharge side of the outer cylinder 6 is fixed to the residue discharge flange 9, and the oil water discharge gap 22 and the residue discharge chamber 14 are It is isolated by the residue discharge flange 9. That is, the oil water discharge gap 22 is blocked by the residue discharge side flange 9 so that the oil water discharged into the oil water discharge gap 22 does not flow into the residue discharge chamber 14. Yes. The width of the oil water discharge gap 22 formed by the inner cylinder 5 and the outer cylinder 6, in other words, the distance between the outer side of the inner cylinder 5 and the inner side of the outer cylinder 6 is determined by the oil-containing sludge. If the oil, toxic substances and moisture separated from the oil-containing sludge by squeezing, and the water that the supplied water vapor has liquefied, that is, the oil water is discharged and can flow to the oil water discharge port 13, There are no particular restrictions.

FIGS. 1 and 2 show that the outer cylinder 6 has a circular cross-sectional shape when cut along a plane perpendicular to the moving direction of the oil-containing sludge. The shape of the outer cylinder 6 is not limited to this, but the inner cylinder 5 can be installed on the inner side, and the oil water discharge gap for allowing the oil water to be discharged and flow to the oil water discharge port 13 is provided. Any material that can be formed may be used. In addition, as the shape of the outer cylinder, for example, a force-pillar shape in which the upper side is flat and the lower side is rounded. Further, the cylindrical wall at the bottom of the outer cylinder 6 may be inclined toward the oil / water discharge port 13.

The stopper 7 is fixed to the screw shaft 2 and is installed in the vicinity of the cylinder end 18 on the residue discharge side of the inner cylinder 5. When the stopper 7 is discharged from the cylinder end 18 to the residue discharge chamber 14, the stopper 7 It functions to adjust the compressibility of oil-containing sludge by adjusting the amount of residue discharged. Specifically, by adjusting the installation position of the stopper 7, the size of the residue discharge gap 15 formed between the stopper 7 and the tube end 18 is adjusted, and the Residue discharge can be adjusted. Then, the compression ratio of the oil-containing sludge can be adjusted by adjusting the ratio of the discharge amount of the residue to the supply amount of the oil-containing sludge. The installation position of the stopper 7 or the discharge gap 15 of the residue formed by the stopper 7 and the cylinder end 18 is the type of oil-containing sludge, the oil content of the oil-containing sludge, processing conditions, etc. Is appropriately selected.

In addition to the stopper shown in FIG. 1, for example, the screw shaft is passed through, and is slidably attached to the screw shaft via a bearing or the like. Examples include a stopper to which a pressure adjusting member that applies pressure by hydraulic pressure, air pressure, or the like is attached. The back surface of the stopper is the side opposite to the side that forms the discharge gap with the inner cylinder. In the embodiment having the stopper to which the pressure adjusting member is attached, by adjusting the pressure with the pressure adjusting member, the size of the discharge gap and the pressure of the squeezing are adjusted according to the type and physical properties of the object to be processed. This makes it easy to select treatment conditions such as the amount of residue discharged and the compression rate.

The oil-containing sludge supply port 10 is a supply port for supplying oil-containing sludge into the inner cylinder 5. As shown in FIG. 4, the installation position of the oil-impregnated sludge supply port 10 in the oil-impregnated sludge moving direction 34 is on the oil-impregnated sludge supply side of the inner cylinder 5 with respect to the length 31 of the inner cylinder 5. The ratio of the length 33 from the cylinder end 19 to the oil-impregnated sludge supply port 10 (reference numeral 3 3 Z sign 3 1), 0.15 or less, preferably 0.125 or less, particularly preferably It is a position where 0 .09 3 to 0. Length 3 from the cylinder end 10 on the oil-impregnated sludge supply side of the inner cylinder 5 to the length 31 of the inner cylinder 5 to the oil-containing sludge supply port 10 When the ratio of 3 is within the above range, the oil content of the oil-containing sludge is reduced. In the present invention, the length 31 of the inner cylinder 5 refers to the distance from the cylinder end 19 on the oil-impregnated sludge supply side of the inner cylinder to the cylinder end 18 on the residue discharge side of the inner cylinder. Further, the position of the oil-containing sludge supply port 10 refers to the center position of the oil-containing sludge supply port 10. Further, the installation position of the oil-impregnated sludge supply port 10 in the circumferential direction of the inner cylinder 5 and the outer cylinder 6 is usually the uppermost position as shown in FIGS. 1 and 4, It is not limited to this, and is appropriately selected depending on the position of an oil-containing sludge supply pipe (not shown).

The outer cylinder-side water vapor supply port 11 supplies water vapor to supply oil vapor from the inner cylinder 5 side to the oil-impregnated sludge in the inner cylinder 5, that is, from the outside of the inner cylinder 5 toward the center. Supply port. As shown in FIG. 4, the installation position of the outer cylinder-side water vapor supply port 11 in the moving direction of the oil-impregnated sludge is as follows. The ratio of the length 3 2 (symbol 3 2 / symbol 3 1) from the cylinder end 19 to the outer cylinder side steam supply port 11 is not more than 0 · 5, preferably ◦0.3 to 0.5, especially The position is preferably 0.14 to 0.3, and more preferably 0.18 to 0.25. The ratio of the length 3 2 from the cylinder end 19 on the oil-impregnated sludge supply side of the inner cylinder 5 to the length 31 of the inner cylinder 5 to the outer cylinder side water vapor supply port 11 is within the above range. Thus, since a large amount of water vapor can be brought into contact with the oil-containing sludge at the initial stage when the oil-containing sludge is compressed in the inner cylinder 5, the effect of reducing the oil content of the oil-containing sludge is enhanced. In the present invention, the position of the outer cylinder side water vapor supply port 11 refers to the center position of the outer cylinder side water vapor supply port 11.

Further, the installation position of the outer cylinder side water vapor supply port 11 in the circumferential direction of the outer cylinder 6 is the lowest position in FIGS. 1 and 4, but is limited to this. Instead, it is appropriately selected depending on the position of a water vapor supply pipe (not shown). Further, the number of the outer cylinder side water vapor supply ports 11 is not particularly limited, and may be 1 or 2 or more.

The oil water discharge port 13 is a discharge port for discharging the oil water discharged to the oil water discharge gap 22 to the outside of the apparatus. The installation position of the oil / water discharge ports 13 and the number of the oil / water discharge ports 13 in the moving direction of the oil-containing sludge are not particularly limited and are appropriately selected. Further, the installation position of the oil / water discharge port 13 in the circumferential direction of the outer cylinder 6 is usually at the lowest position.

The exhaust port 16 is a gas discharge port for discharging a gas such as water vapor in the apparatus to the outside of the apparatus. The installation position of the exhaust port 16 and the number of the exhaust ports 16 in the moving direction of the oil-containing sludge are not particularly limited and are appropriately selected.

The oil-containing sludge supply port 10, the residue discharge port 12, the oil / water discharge port 13, and the exhaust port 16 are normally open. Further, a strainer for separating fine residues mixed in the oil water may be installed at the oil water discharge port 13.

The oil-impregnated sludge reducing device 1 is provided with driving means (not shown) for rotating the screw 4.

In the oil-impregnated sludge reduction device 1, the screw shaft 2 and the inner cylinder 5 may be horizontal, may be inclined to the oil-containing sludge supply side, and may be inclined to the residue discharge side. Or it may be vertical.

Next, the operation method of the oil-impregnated sludge reduction device of the present invention will be described with reference to FIG. FIG. 5 is a schematic cross-sectional view of the oil-retaining sludge reduction device 1 showing a state in which the oil-containing sludge reduction device 1 is used to process the oil-containing sludge. In the oil impregnated sludge reducing device 1, the oil impregnated sludge 41 is supplied to the oil impregnated sludge supply port 1 by supplying the oil impregnated sludge 41 from the oil impregnated sludge supply port 10 and rotating the screw 4. From 0, the compressed space 17 formed in a spiral around the screw shaft 2 is moved toward the cylinder end 18 on the residue discharge side of the inner cylinder, and the oil-containing sludge 41 is By pushing toward the cylinder end 18, high pressure is applied to the oil-containing sludge 41, and the oil-containing sludge 41 is squeezed. During this compression, while the screw 4 is rotated, steam 40 0 a is supplied from one end 28 of the screw shaft 2, and steam 40 b is supplied from the outer cylinder side steam supply port 11 1, thereby Steam is brought into contact with the sludge 41 from both the center of the inner cylinder 5 and the outside.

And while rotating the screw 4, supplying the steam 40 a and 40 b, continuously supplying the oil-containing sludge 41, and discharging the residue 43, continuously. In particular, the oil content of the oil-containing sludge 41 can be reduced. At that time, the oil water 4 2 is discharged from the oil water discharge port 13 and the exhaust gas 45 is discharged from the exhaust port 16 as appropriate.

In the oil-impregnated sludge reducing device 1, the oil-impregnated sludge 4 1 comes into contact with the water vapor 40 at the time of pressing, so that the oil-impregnated sludge becomes high temperature and the water content increases. This makes it easier to separate the solid and liquid components. Therefore, the oil-retaining sludge reducing device 1 can increase the effect of reducing the oil content in the oil-containing sludge 41, so that the oil content in the residue 43 can be reduced. it can.

During the pressing, the oil-containing sludge is heated by water vapor supplied into the oil-containing sludge reduction device 1, and the temperature of the water vapor supplied is preferably from 100 to 200 ° C., preferably Is from 100 to 180 ° C, particularly preferably from 110 to 150 ° C, and more preferably from 110 to 120 ° C. The supplied When the temperature of the water vapor is within the above range, the effect of reducing the oil content in the oil-containing sludge 41 is enhanced. Further, the temperature in the oil-reducing sludge reducing device 1 during the pressing is a steady-state temperature of 100 to 200 ° C., preferably 100 to 180, particularly preferably. Is 1 1 0 to 1 5 0 ° C, more preferably 1 1 0 to 1 2 0 ° C. When the temperature in the oil-containing sludge reducing device 1 during the pressing is within the above range, the effect of reducing the oil content in the oil-containing sludge 4 1 is enhanced. Note that the temperature in the oil-retaining sludge reducing device 1 during the pressing is such that a thermocouple or the like is installed in the oil water discharge gap 22 at a position that does not directly contact the supplied steam. Obtained by measuring the temperature of oil drain gap 2 2.

In the pressing, the pressing pressure for pressing the oil-containing sludge is appropriately selected according to the type of oil-containing sludge.

The pressing time of the oil-containing sludge 41 during the pressing, that is, the oil-containing sludge 41 is supplied from the oil-containing sludge supply port 10, and the residue 4 3 is discharged from the residue discharge gap 15. The time until it is discharged as 1 to 3 hours, preferably 1.5 to 3 hours, particularly preferably 2 to 2.5 hours. When the pressing time of the oil-containing sludge 41 during the pressing is within the above range, the effect of reducing the oil content in the oil-containing sludge 41 is enhanced. In the oil impregnated sludge reducing device 1, the rotational speed of the screw 4, the supply amount of the oil impregnated sludge 41 from the oil impregnated sludge supply port 10, and the residue from the discharge gap 15 of the residue By appropriately selecting the discharge amount of the residue 43, the squeezing time of the oil-containing sludge 41 during the squeezing can be adjusted. In the oil-impregnated sludge reduction device 1, the amount of the residue 4 3 discharged from the residue discharge gap 15 is adjusted by adjusting the size of the residue discharge gap 15. be able to.

The oil-impregnated sludge reduction device of the present invention comprises the inner cylinder relative to the length of the inner cylinder. The ratio of the length from the cylinder end on the oil-impregnated sludge supply side to the steam supply port on the outer cylinder side is 0.5 or less, so that at the initial stage of the oil-containing sludge pressing step, that is, the oil-containing sludge supply Since water vapor can be brought into contact with the oil-containing sludge closer to the mouth, the oil-containing sludge's oil content and harmful substances are reduced more effectively, and a residue with a low content of oil and harmful substances is obtained. It is done.

The oil-impregnated sludge reduction device of the present invention further increases the ratio of the pitch of the screw blade to the diameter of the screw blade, that is, by relatively increasing the pitch of the screw blade. The oil-containing sludge is compressed and heated for a long time so that the oil-containing sludge is slowly compressed. Further, by increasing the pressing time and heating time of the oil-containing sludge, the effect of reducing the oil content and harmful substances of the oil-containing sludge is further enhanced. Explanation of symbols

1 Oil-retaining sludge reduction device

Screw shaft

Screw feather

Screw

Inner cylinder

Outer cylinder

Stock

Oil-impregnated sludge supply side flange

Residue discharge flange

Oil-impregnated sludge supply port

Outer cylinder side steam supply port 1 2 Residue outlet

1 3 Oil / water outlet

1 4 Waste discharge chamber

1 5 Residue discharge gap

1 6 Exhaust port

1 7 Compressed space

1 8 Tube end on the waste discharge side of the inner tube

1 9 Tube end on the oil-impregnated sludge supply side

2 0 Outer cylinder end of oil-impregnated sludge supply side

2 1 Tube end on the waste discharge side of the outer tube

2 2 Oil water discharge gap

2 3 Part surrounded by inner cylinder 5

2 4 Range where water vapor supply holes 2 7 are formed

2 5 Diameter of screw blade 3

2 6 Skew feather 3 pitch

2 7 Water vapor supply hole

2 8 One end of screw shaft 2

2 9 The other end of screw shaft 2

3 1 Length of inner cylinder 5

3 2 Length from the cylinder end 19 on the oil-impregnated sludge supply side of the inner cylinder 5 to the steam supply port 1 1 on the outer cylinder side

3 3 Length from the cylinder end 19 on the oil-impregnated sludge supply side of the inner cylinder 5 to the oil-impregnated sludge supply port 10

3 4 Movement direction of oil-impregnated sludge

4 0 a, 4 0 b Water vapor

4 1 Oil-impregnated sludge 4 2 Oil and water

4 3 Residue

4 5 Exhaust gas

2 6 1 a, 2 6 1 b

Industrial applicability

According to the present invention, it is possible to easily reduce the amount of oil-containing sludge.

Claims

The scope of the claims

1. a screw shaft having a steam supply hole, and a screw comprising a screw blade spirally provided on the outer periphery of at least a part of the screw shaft;

An inner cylinder having an oil-water passage hole and surrounding the screw;

Driving means for rotationally driving the screw;

Have

A device for reducing oil content sludge.

2. The oil-impregnated sludge reduction device according to claim 1, wherein a specific force of the pitch of the screw blades to the diameter of the screw blades is 0.5 to 1.25.

3. The stopper is a stopper in which the screw shaft is inserted, is slidably attached to the screw shaft, and a pressure adjusting member is attached to the back surface. The oil-retaining sludge reduction device according to 1.