JP2010194388A - Method for reducing quantity of oil-containing sludge - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for reducing the quantity of oil-containing sludge, in which the content of oil and harmful substances in the oil-containing sludge is reduced to such an amount that landfill disposal is possible by a one-step operation. <P>SOLUTION: In the method for reducing the quantity of an oil-containing sludge, the oil-containing sludge 71 is brought into contact with water vapor 70a and 70b and the oil-containing sludge is compressed to separate the oil-containing sludge into oily water 72 and a residue 73. The temperature of the water vapor to be brought into contact with the oil-containing sludge is 130 to 160°C and the pressure of the water vapor is 0.27 to 0.62 MPa. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method for reducing oil-containing sludge for separating and reducing oil content and harmful substances from oil-containing sludge such as crude oil sludge and crude oil drilling mud.

  When crude oil is stored in a tank, the wax and alfalten 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. Also, when oil is excavated, oil-containing sludge similar to crude oil sludge is generated. Such sludge is generally called a drilling mud. The crude oil sludge and the drilling mud contain a trace amount 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 sludge is subjected to intermediate treatment and then centrifuged, the oil content is reduced from the crude oil sludge and then incinerated. In the case of crude oil sludge or drilling mud with low oil content, the crude oil sludge or drilling mud is centrifuged to separate the approximate oil content from the crude oil sludge or drilling mud, and then the oil-containing sludge having a reduced oil content is removed. Oil has been removed by incineration and then the residue with reduced oil content has been landfilled.

  From the viewpoint of environmental impact, in order to dispose of the residue in landfill, 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 harmful substances in the residue below the criteria for landfill disposal. Incineration of oil-containing sludge was essential.

  Therefore, in the conventional disposal method of oil-impregnated sludge, since two to three steps of operations such as centrifugal separation and incineration, or intermediate treatment, centrifugal separation and incineration are performed, the problem of increased processing costs and the equipment space become wide. There was a problem. Therefore, it is desired to develop a method that can reduce the amount of oil in the oil-containing sludge to an amount that can be disposed by landfill in a single operation.

  Accordingly, an object of the present invention is to provide a method 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 by a single stage operation. .

  As a result of intensive studies to solve the above-described problems in the prior art, the inventor (1) brought the oil-containing sludge into contact with water vapor having a specific temperature range and a specific pressure, and then compressed the oil-containing sludge. Then, by separating the oily water and the residue, it was found that the content of oil and harmful substances in the oil-containing sludge can be satisfactorily reduced by one stage of operation, and the present invention has been completed.

That is, the present invention is a method for reducing the amount of oil-containing sludge in which water vapor is brought into contact with the oil-containing sludge, and then the containing sludge is squeezed and separated into oil water and residue.
The temperature of the water vapor contacted with the oil-containing sludge is 130 to 160 ° C., and the pressure of the water vapor is 0.27 to 0.62 MPa,
The present invention provides a method for reducing the amount of oil-impregnated sludge.

  According to the present invention, it is possible to provide a method 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 by landfill in a single operation.

It is typical sectional drawing of the weight reduction apparatus of a compression piston type oil-impregnated sludge, and is sectional drawing when it cuts in the surface parallel to the pressing direction of a compression piston. It is typical sectional drawing of the weight reduction apparatus of a compression piston type oil-impregnated sludge, and is sectional drawing when it cuts in the surface perpendicular | vertical with respect to the pressing direction of a compression piston. It is a figure which shows the position before and behind pressing of the pressing piston in FIG. FIG. 2 is a schematic cross-sectional view of a screw-type oil-impregnated sludge reducing device, and is a cross-sectional view when cut along a plane parallel to the moving direction of the oil-containing sludge. FIG. 2 is a schematic cross-sectional view of a screw-type oil-impregnated sludge reducing device, and is a cross-sectional view when cut along a plane perpendicular to the moving direction of the oil-containing sludge. It is a side view of the screw in FIG.4 and FIG.5. It is sectional drawing which described the inner cylinder and outer cylinder of FIG. FIG. 3 is a schematic cross-sectional view of a screw-type oil-impregnated sludge reducing device 31 showing a state in which the oil-containing sludge is processed using a screw-type oil-containing sludge reducing device 31.

The method for reducing the amount of oil-containing sludge of the present invention is a method for reducing oil-containing sludge in which water vapor is brought into contact with the oil-containing sludge, and then the containing sludge is compressed and separated into oil water and residue,
In this method, the temperature of the water vapor brought into contact with the oil-containing sludge is 130 to 160 ° C., and the pressure of the water vapor is 0.27 to 0.62 MPa. In the present invention, the oil-containing sludge is separated into the oil content, harmful substances and moisture in the oil-containing sludge, and water condensed from the supplied water vapor and the residue, but the oil content in the oil-containing sludge, Including all harmful substances and moisture and moisture condensed from the supplied water vapor are also referred to as “oil water”.

  The oil-impregnated sludge reducing method of the present invention includes a batch-type oil-containing sludge reducing method (hereinafter also referred to as the oil-containing sludge reducing method A of the present invention) and a continuous oil-containing sludge reducing method. (Hereinafter, it is also referred to as a method B for reducing oil-containing sludge of the present invention.).

  First, the method A for reducing oil-containing sludge according to the present invention will be described. The method A for reducing the amount of oil-containing sludge according to the present invention is performed, for example, by a compression piston type oil-containing sludge reducing device shown in FIGS. FIG. 1 and FIG. 2 are schematic cross-sectional views of the compression piston type oil-retaining sludge reducing device, and FIG. 1 is a cross-sectional view taken along a plane parallel to the pressing direction of the compression piston. Moreover, FIG. 2 is sectional drawing when it cut | disconnects by the surface perpendicular | vertical with respect to the pressing direction of a pressing piston. Moreover, FIG. 3 is a figure which shows the position before and behind pressing of the pressing piston in FIG. In FIG. 1, a compression piston type oil-impregnated sludge reducing device 10 is installed so as to be movable up and down in the inner cylinder 11, and a compression piston 18 for compressing the oil-containing sludge in the inner cylinder 11 and a cylindrical shape The outer cylinder 12 installed outside the inner cylinder 11 so that an oil-water discharge gap 13a is formed between the inner cylinder 11 and the inner cylinder 11, and the outer cylinder 12 are fixed. An oil water discharge gap 13b is formed between the pedestal 17 and the upper flange 19 for closing the upper sides of the inner cylinder 11 and the outer cylinder 12 and the pedestal 17, so that the inner cylinder 11 A bottom wall 111 to which the inner cylinder 11 is fixed, a water vapor supply port 14 for supplying water vapor into the compression piston type oil-retaining sludge reducing device 10, and discharge of the oil water Oil water discharged to the gaps 13a and 13b is discharged out of the apparatus. It has an oil water discharge port 15 of the fit, the gas of the outer cylinder 12, an exhaust port 16 for discharging to the outside of the apparatus, the.

  The pressing piston 18 is a member for pressing the oil-containing sludge in the inner cylinder 11 by pushing in the inner cylinder 11. The outer diameter of the compression piston 18 may be the same length as the inner diameter of the inner cylinder 11 or may be slightly smaller than the inner diameter of the inner cylinder 11. When the outer diameter of the pressing piston 18 is smaller than the inner diameter of the inner cylinder 11, the gap between the pressing piston 18 and the inner cylinder 11 is usually 3 mm or less, preferably 2 mm or less, particularly preferably 1 mm or less. .

  The inner cylinder 11 has a vertical cylindrical shape. The lower cylinder end of the inner cylinder 11 is fixed to the bottom wall 111, and the upper cylinder end of the inner cylinder 11 is closed by the upper flange 19. The bottom wall 111 is installed below the inner cylinder 11 so that an oil-water discharge gap 13b is formed between the inner cylinder 11 and the base 17.

  Oil water separated from the oil-containing sludge by squeezing the oil-containing sludge on the cylinder wall and the bottom wall 111 of the inner cylinder 11 is transferred from the inner cylinder 11 and the bottom wall 111 to the oil-water discharge gaps 13a and 13b. An oil water passage hole (not shown) is formed so as to be discharged. The oil water passage hole is also a water vapor passage hole. An oil water passage hole is also formed in a portion 112 of the bottom wall 111 located between the oil water discharge gap 13a and the oil water discharge gap 13b so that oil water and water vapor can pass therethrough. It has become.

  The size of the oil water passage hole formed in the cylinder wall and the bottom wall 111 of the inner cylinder 11 is determined by introducing the oil-containing sludge directly into the inner cylinder 11 or filtering the oil-containing sludge. It depends on whether you put something wrapped in cloth.

  When the oil-impregnated sludge is directly charged into the inner cylinder 11, the diameter of the oil water passage hole formed in the cylinder wall and the bottom wall 111 of the inner cylinder 11 is determined as a residue in the oil-impregnated sludge to be treated. In the range smaller than the diameter, it is appropriately selected, and is usually 0.1 to 2.0 mm, preferably 0.2 to 1.0 mm. As the cylindrical wall and the bottom wall 111 of the inner cylinder 11, it is only necessary to have a passage hole having a diameter in the above range. For example, a metal plate, a plate material punched with holes such as punching metal, a screen For example, wire mesh. When the cylindrical wall of the inner cylinder 11 and the bottom wall 111 are metal meshes, the diameter of the oil water passage hole indicates the length of the mesh opening of the metal mesh, and the cylindrical wall of the inner cylinder 11 is punched. In the case of metal, the diameter of the oil water passage hole refers to the diameter of the punched hole.

  Further, when the oil-clad sludge wrapped in a filter cloth or the like is put into the inner cylinder 11, the residue leaks out of the inner cylinder 11 and the bottom wall 111 through the oil water passage hole. Therefore, the diameter of the oil water passage hole is appropriately selected within a range where water vapor is efficiently supplied to the oil-containing sludge. Examples of the cylindrical wall and the bottom wall 111 of the inner cylinder 11 include a metal net, a plate material punched with holes such as punching metal, a screen metal net, and the like.

  The outer cylinder 12 has a vertical cylindrical shape. The lower cylinder end of the outer cylinder 12 is fixed to the pedestal 17, and the upper cylinder end of the outer cylinder 12 is closed by the upper flange 19.

  The width of the oil water discharge gap 13 a formed by the inner cylinder 11 and the outer cylinder 12, in other words, the distance between the outer side of the inner cylinder 11 and the inner side of the outer cylinder 12 squeezes the oil-containing sludge. Thus, there is no particular limitation as long as the oil, toxic substances, and water separated from the oil-containing sludge, and the water in which the supplied water vapor is condensed, that is, the oil water is discharged and can flow to the oil water discharge port 15. Further, the width of the oil water discharge gap 13b formed by the bottom wall 111 and the pedestal 17, in other words, the distance between the lower side of the bottom wall 111 and the upper side of the pedestal 17 squeezes the oil-containing sludge. Thus, there is no particular limitation as long as the oil, toxic substances, and water separated from the oil-containing sludge, and the water in which the supplied water vapor is condensed, that is, the oil water is discharged and can flow to the oil water discharge port 15.

  In the compression piston type oil-impregnated sludge reducing device 10 shown in FIGS. 1 and 2, the shapes of the inner cylinder 11 and the outer cylinder 12 are cut along a plane perpendicular to the moving direction of the oil-containing sludge. The cross-sectional shape at the time is circular, and the shape of the compression surface of the compression piston 18 is circular, but the shape of the inner cylinder 11 and the outer cylinder 12 and the shape of the compression surface of the compression piston are However, the shape of the inner cylinder 11 and the compression piston 18 is not limited to this, and the oil-containing sludge can be compressed by pressing the compression piston 18 downward in the inner cylinder 11. For example, the shape of the outer cylinder 12 is not particularly limited, and the inner cylinder 11 can be installed on the inner side, and oil water can be discharged to form an oil water discharge gap for flowing to the oil water discharge port 15. Anything is acceptable.

  The water vapor supply port 14 is a water vapor supply port for supplying water vapor to the oil-containing sludge in the inner cylinder 11. In FIG. 1, the installation position of the water vapor supply port 14 is the bottom of the compression piston type oil-impregnated sludge reducing device 10, but is not limited thereto. For example, the pressure piston type oil-containing sludge is reduced. It can also be installed on the side of the device 10, that is, on the outer cylinder 12. When the water vapor supply port 14 is installed in the outer cylinder 12, the installation position of the water vapor supply port 14 in the pushing direction of the compression piston 18 is not particularly limited, and is installed at the lowermost position of the outer cylinder 12. In consideration of the movement range of the compression piston 18, for example, it is installed below the position 22 (FIG. 3) after the compression piston 18 is compressed, and the installation position of the exhaust port 16 is considered. Thus, in the cross-sectional view of the outer cylinder cut by a plane parallel to the pressing direction of the compression piston 18, the exhaust port 16 is set upward and the water vapor supply port 14 is set downward, etc., as appropriate. The number of the water vapor supply ports 14 is not particularly limited, and may be 1 or 2 or more. And it is preferable that the installation position of this water vapor | steam supply port 14 is the bottom part of the weight reduction apparatus 10 of this compression piston type oil-containing sludge at the point from which the contact efficiency of oil-containing sludge and water vapor | steam becomes high.

  The oil water discharge port 15 is a discharge port for discharging the oil water discharged to the oil water discharge gap 13 to the outside of the apparatus. In FIG. 1, the installation position of the oil / water discharge port 15 is the bottom of the compression piston type oil-impregnated sludge reducing device 10, but is not limited thereto. For example, the pressure piston type oil-containing sludge is reduced. It can also be installed below the side surface of the apparatus 10, that is, below the outer cylinder 12. And it is preferable at the point which becomes easy to discharge | emit this oil water that the installation position of this oil-water discharge port 15 is the bottom part of the weight reduction apparatus 10 of this compression piston type oil-containing sludge. In addition, the number of installed oil / water outlets 15 is not particularly limited and may be appropriately selected.

  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 pushing direction of the compression piston are not particularly limited and are appropriately selected.

  The oil water outlet 15 may be provided with a strainer for separating fine residues mixed in the oil water. Further, when steam is brought into contact with the oil-containing sludge, steam such as hydrocarbons is generated. Therefore, it is preferable to install a cooling means at the exhaust port 16 in order to recover them.

  The compression piston type oil-impregnated sludge reducing device 10 is provided with load loading means (not shown) for pushing the compression piston 18 downward.

  1 to 3 show the oil-retaining sludge reducing device 10 installed vertically, the oil-retaining sludge reducing method A for reducing the oil-containing sludge of the present invention is used. The device may be a horizontal device.

  In order to perform the oil-impregnated sludge reduction method A of the present invention using the compression piston-type oil-impregnated sludge reduction device 10, first, the compression piston 18 and the upper flange 19 are removed, and the inner cylinder is removed. 11 is charged with the oil-containing sludge 115. At this time, the oil-containing sludge 115 is partitioned into two or more parts by using one or more partition plates 113. Next, the compression piston 18 and the upper flange 19 are attached. Next, steam at 130 to 160 ° C. and 0.27 to 0.62 MPa is supplied from the steam supply port 14 to bring the steam into contact with the oil-containing sludge 115. Next, as shown in FIG. 3, the oil-impregnated sludge 115 is squeezed by pushing the squeezing piston 18 from a position 21 before squeezing to a position 22 after squeezing. By this compression, the object to be compressed in the inner cylinder 11 is separated into the oil water and the residue, and the oil water is discharged into the oil water discharge gaps 13a and 13b. After the pressing piston 18 is pushed to the position 22 after the pressing, the pressing is stopped, the pressing piston 18 and the upper flange 19 are removed, and the residue is taken out from the inner cylinder 11.

  As described above, the method A for reducing the amount of oil-containing sludge according to the present invention is a method for reducing oil-containing sludge in which the oil-containing sludge is pressed into water vapor and then separated into the oily water and the residue after contacting water vapor with the oil-containing sludge. is there. In the oil impregnation sludge reduction method A of the present invention, the oil impregnation sludge is heated by steam supplied into the compression piston type oil impregnation sludge reduction device 10. The temperature of the water vapor to be supplied is 130 to 160 ° C, preferably 130 to 150 ° C. When the temperature of the water vapor to be supplied is less than the above range, it becomes difficult to separate the oil and residue in the oil-containing sludge, or it takes a long time to separate, and the processing efficiency deteriorates. The amount of oil in the oil-containing sludge becomes steam becomes too large. The pressure of the water vapor to be supplied is 0.27 to 0.62 MPa, preferably 0.27 to 0.48 MPa. When the pressure of the steam to be supplied is within the above range, the high-pressure steam collides with the oil-containing sludge, so that the contact efficiency between the oil-containing sludge and the steam is increased. And in the method A for reducing oil-containing sludge of the present invention, the temperature and pressure of the water vapor to be supplied are within the above range, so that the oil and harmful substances in the oil-containing sludge can be reduced well. it can.

Further, the amount of the water vapor to be supplied is preferably a ratio of the water supply amount to the oil-containing sludge supply amount (water vapor supply amount (tons) / oil-containing sludge supply amount (m ³ )) is preferably 0.5. 1.5 tons / ^{m 3,} particularly preferably in an amount comprised 1.0 to 1.5 tons / ^{m 3.} In the oil impregnation sludge reduction method A of the present invention, the supply amount of the oil impregnation sludge is the amount of the oil impregnation sludge charged into the inner cylinder.

  Moreover, the temperature in the weight reduction apparatus 10 of this compression piston type oil-impregnated sludge is a steady-state temperature, and is 110-160 degreeC, Preferably it is 120-150 degreeC. When the temperature in the compression piston type oil-containing sludge reducing device 10 is within the above range, the oil content and harmful substances in the oil-containing sludge can be reduced well. Note that the temperature in the compression piston type oil impregnated sludge reducing device 10 is set such that a thermocouple or the like is installed in a position not in direct contact with the supplied water vapor in the oil water discharge gap 13a. It is obtained by measuring the temperature of 13a.

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

  The pressing time of the oil-containing sludge at the time of pressing, that is, the time for pressing the pressing piston 18 from the position 21 before pressing to the position 22 after pressing is preferably 1 hour or more, particularly preferably 1 to 3 hours. Time, more preferably 2 to 3 hours. When the pressing time of the oil-containing sludge during the pressing is within the above range, the effect of reducing the amount of oil and harmful substances in the oil-containing sludge is enhanced. In addition, even if this pressing time is too long, although the effect of this invention is acquired, the improvement of the effect of this invention will peak and processing efficiency will worsen.

  In the method A for reducing oil-containing sludge according to the present invention, as shown in FIG. 1, one or more partition plates can be installed in the inner cylinder 11 during pressing. That is, the oil-containing sludge is partitioned into two or three or more in the inner cylinder 11 by the partition plate. And by installing this partition plate, in compressing, since a pressure can be uniformly applied with respect to oil-containing sludge and water vapor can be made to contact the whole oil-containing sludge, thermal efficiency and compression efficiency increase. The shape of the partition plate is not particularly limited as long as it has a passage hole 114 through which water vapor and oil water can pass, but as shown in FIG. 1, a hollow one is uniformly added to the oil-containing sludge. It is preferable at the point which the effect which makes water vapor | steam contact becomes high.

  In the method A for reducing the amount of oil-containing sludge of the present invention, the oil-containing sludge is compressed after bringing the oil-containing sludge into contact with the oil-containing sludge before pressing. The oil-containing sludge is also compressed during the compression of the oil-containing sludge. By supplying, the oil-containing sludge can be pressed while bringing water vapor into contact therewith. And, in the method A for reducing the amount of oil-containing sludge of the present invention, the effect of reducing the oil content and harmful substances in the oil-containing sludge is increased by bringing the water vapor into contact with the oil-containing sludge even during the compression of the oil-containing sludge. be able to. When steam is supplied from the steam supply port 14 during the compression of the oil-containing sludge, the ratio of the supply amount of the water vapor to the supply amount of the oil-containing sludge is in contact with the oil-containing sludge before the oil-containing sludge is compressed. The total amount of the amount of water vapor and the amount of water vapor supplied during pressing of the oil-containing sludge is calculated as the amount of water vapor supplied.

  In the method A for reducing the amount of oil-impregnated sludge according to the present invention, the temperature and pressure of the water vapor brought into contact with the oil-containing sludge are set within a specific range. It becomes easy to separate the solid content and the liquid content. Therefore, in the method A for reducing oil-containing sludge according to the present invention, the oil content and harmful substances of the oil-containing sludge can be effectively reduced.

Next, the method B for reducing oil-containing sludge according to the present invention will be described. The oil-impregnated sludge reduction method B of the present invention includes, for example, the following screw-type oil-impregnated sludge reducer, that is, a screw shaft having a water vapor supply hole, and a spiral shape on the outer periphery of at least a part of the screw shaft. A screw composed of screw blades,
An inner cylinder having an oil water passage hole and surrounding the screw;
An outer cylinder installed outside the inner cylinder and forming 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 that is installed in the vicinity of the cylinder end on the residue discharge side of the inner cylinder, and that forms a discharge gap for the residue between 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;
A strainer attached to the oil / water outlet;
Drive means for rotationally driving the screw;
It can carry out using the reduction | decrease apparatus of the oil-containing sludge which has.
In the oil-impregnated sludge reducing device, the ratio of the length from the cylinder end of the inner cylinder 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.

  The screw-type oil-impregnated sludge reducing device will be described with reference to FIGS. 4 and 5 are schematic cross-sectional views of the screw-type oil-impregnated sludge reducing device, and FIG. 4 is a cross-sectional view taken along a plane parallel to the moving direction of the oil-containing sludge. 5 is a cross-sectional view when cut along a plane perpendicular to the moving direction of the oil-containing sludge. FIG. 6 is a side view of the screw in FIGS. 4 and 5. FIG. 7 is a cross-sectional view illustrating the inner cylinder and the outer cylinder of FIG. 4 and 5, the screw-type oil-impregnated sludge reducing device 31 includes oil and water between the screw 34, the inner cylinder 35 surrounding the screw 34, and the outer cylinder 35 and the inner cylinder 35. An outer cylinder 36 installed so as to form a discharge gap 52, a stopper 37 installed in the vicinity of a cylinder end 48 on the residue discharge side of the inner cylinder 35, the inner cylinder 35 and the outer cylinder The oil-impregnated sludge supply side flange 38 installed on the oil-impregnated sludge supply side 36 and the residue discharge installed so as to form a residue discharge chamber 44 on the residue discharge side of the inner cylinder 35 and the outer cylinder 36 A side flange 39, an oil-impregnated sludge supply port 40 for supplying oil-containing sludge into the inner cylinder 35, an outer cylinder-side water vapor supply port 41 for supplying water vapor into the outer cylinder 36, and the residue discharge To discharge the residue from the chamber 44 to the outside of the apparatus Residue discharge port 42, oil water discharge port 43 for discharging the oil water discharged to the oil water discharge gap 52 to the outside of the apparatus, strainer 431 attached to the oil water discharge port 43, and the outer cylinder And an exhaust port 46 for exhausting the gas in 36 to the outside of the apparatus.

  As shown in FIG. 6, the screw 34 includes a screw shaft 32 and screw blades 33. The screw blade 33 is spirally provided on the outer periphery of at least a part of the screw shaft 32. The screw shaft 32 is rotatably fixed to the oil-containing sludge supply side flange 38 and the residue discharge side flange 39.

  The screw shaft 32 is a hollow tube, and one end 58 of the screw shaft 32 is open to supply water vapor into the tube of the screw shaft 32, while the other end 59 of the screw shaft 32. Is sealed. The shaft wall of the screw shaft 32 is formed with a water vapor supply hole 57 for discharging water vapor from the space inside the shaft to the outside of the shaft. The steam supply hole 57 is a steam supply hole for supplying steam to the oil-containing sludge in the inner cylinder 35 from the screw shaft 32 side, that is, from the center of the inner cylinder 35 to the outside.

  The water vapor supplied from the screw shaft side exhibits the effect of heating the oil-containing sludge by the temperature and the effect of increasing the contact efficiency by scattering the oil-containing sludge in the inner cylinder by the pressure.

  The diameter of the water vapor supply hole 57 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, and particularly preferably 8 to 10 mm. In FIG. 6, the range 54 in which the water vapor supply hole 57 is formed is appropriately selected. Usually, the oil-containing sludge supply side is close to the oil-containing sludge supply side flange 38, and usually the residue is discharged. The ratio of the length of the range 54 in which the water vapor supply hole 57 is formed to the length of the portion 53 surrounded by the inner cylinder 35 (reference numeral 54 / reference numeral 53) is 0.5 to 0.866. , Preferably 0.66 to 0.866, particularly preferably 0.76 to 0.866. When the ratio of the length of the range 54 in which the water vapor supply hole 57 is formed to the length of the portion 53 surrounded by the inner cylinder 35 (reference numeral 54 / reference numeral 53) exceeds the above range, Water content tends to increase. The number of the water vapor supply holes 57 is appropriately selected depending on the type of oil-containing sludge, the scale of the apparatus, and the like.

  The screw blade 33 is formed in a spiral shape on the outer periphery of the screw shaft 32, and when the screw 34 rotates, the oil-containing sludge in the inner cylinder 35 is transferred from the oil-containing sludge supply side to the residue discharge side. The shape is not particularly limited as long as it can be moved.

  The diameter 55 of the screw blade 33 may be the same length as the inner diameter of the inner cylinder 35, or may be slightly smaller than the inner diameter of the inner cylinder 35. When the diameter 55 of the screw blade 33 is smaller than the inner diameter of the inner cylinder 35, the gap between the screw blade 33 and the inner cylinder 35 is usually 1 mm or less, preferably 0.5 mm or less, particularly preferably 0. 1 mm or less.

  The ratio of the pitch 56 of the screw blade 33 to the diameter 55 of the screw blade 33 (reference numeral 56 / reference numeral 55) is 0.25 to 1.25, preferably 0.5 to 1.25, particularly preferably 0.75. To 1, more preferably 0.9 to 1. In the present invention, the pitch 56 of the screw blades 33 is the distance between the tops 561a and 561b of the screw blades in FIG. 6, that is, between the tops of adjacent blades when the screw blades 33 are viewed from the side. Refers to the distance.

  The pitch 56 of the screw blades 33 may be the same or different over the entire range of the screw blades 33.

  In addition, in this invention, the shape of this screw 34 is not limited to the shape shown in FIG.4 and FIG.6, for example, the diameter of the screw shaft becomes large toward the residue discharge side, for example And those having a pitch that decreases toward the residue discharge side.

  The inner cylinder 35 has a cylindrical shape. A cylinder end 49 on the oil-impregnated sludge supply side of the inner cylinder 35 is fixed to the oil-impregnated sludge supply-side flange 38, and the cylinder end 49 is closed by the oil-impregnated sludge supply-side flange 38. On the other hand, the cylinder end 48 on the residue discharge side of the inner cylinder 35 is fixed to the residue discharge side flange 39, and the opening of the cylinder end 48 is connected to the residue discharge chamber 44. That is, the cylinder end 48 is opened so that the residue is discharged out of the inner cylinder.

  On the cylinder wall of the inner cylinder 35, the oil water separated from the object to be compressed in the inner cylinder 35 by squeezing the oil-containing sludge is discharged from the inner cylinder 35 to the oil water discharge gap 52. An oil water passage hole (not shown) is formed. The oil water passage hole is also a water vapor passage hole.

  The cylindrical wall of the inner cylinder 35 is not particularly limited as long as the oil water passage hole is formed. Examples of the cylindrical wall of the inner cylinder 35 include holes such as a wire mesh and punching metal. Punched plate material, screen wire mesh and the like can be mentioned.

  The diameter of the oil water passage hole formed in the cylinder wall of the inner cylinder 35 is appropriately selected depending on the size of the residue in the oil-containing sludge to be treated, but is usually 0.1 to 1.96 mm, Preferably it is 0.2-1.0 mm. When the cylinder wall of the inner cylinder 35 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 35 is a punching metal, The diameter of the oil water passage hole refers to the diameter of the punched hole.

  By installing the inner cylinder 35 so as to surround the screw 34, a pressing space 47 for pressing the oil-containing sludge is formed between the inner wall of the inner cylinder 35 and the screw blade 34.

  The outer cylinder 36 has a cylindrical shape. A cylinder end 50 on the oil-impregnated sludge supply side of the outer cylinder 36 is fixed to the oil-impregnated sludge supply-side flange 38, and the cylinder end 50 is closed by the oil-containing sludge supply-side flange 38. On the other hand, a cylinder end 51 on the residue discharge side of the outer cylinder 36 is fixed to the residue discharge side flange 39, and the oil water discharge gap 52 and the residue discharge chamber 44 are connected to the residue discharge side. It is isolated by a side flange 39. That is, the oil water discharge gap 52 is blocked by the residue discharge side flange 39 so that the oil water discharged into the oil water discharge gap 52 does not flow into the residue discharge chamber 44.

  The width of the oil water discharge gap 52 formed by the inner cylinder 35 and the outer cylinder 36, in other words, the distance between the outer side of the inner cylinder 35 and the inner side of the outer cylinder 36 squeezes the oil-containing sludge. Thus, the oil, toxic substances, and water separated from the pressed product in the inner cylinder 35 and the water condensed from the supplied water vapor, that is, the oil water is discharged and can flow to the oil water outlet 43. There is no particular restriction.

  4 and 5, the outer cylinder 36 has a circular cross-sectional shape when cut by a plane perpendicular to the moving direction of the oil-containing sludge. The shape is not limited to this, as long as the inner cylinder 35 can be installed on the inner side and oil water is discharged and an oil water discharge gap for flowing to the oil water discharge port 43 can be formed. Good. In addition, as the shape of the outer cylinder, for example, the outer cylinder is flat and rounded downward. Further, the cylindrical wall at the bottom of the outer cylinder 36 may be inclined toward the oil water discharge port 43.

  The stopper 37 is fixed to the screw shaft 32 and is installed in the vicinity of the cylinder end 48 on the residue discharge side of the inner cylinder 35. The stopper 37 functions to adjust the compressibility of the oil-containing sludge by adjusting the discharge amount of the residue when the residue is discharged from the tube end 48 to the residue discharge chamber 44. . Specifically, by adjusting the installation position of the stopper 37, the size of the discharge gap 45 of the residue formed between the stopper 37 and the tube end 48 is adjusted, and the residue The amount of discharge can be adjusted. And the compression rate of this oil-containing sludge can be adjusted by adjusting the ratio of the discharge amount of this residue with respect to the supply amount of this oil-containing sludge. The installation position of the stopper 37 or the residue discharge gap 45 formed by the stopper 37 and the cylinder end 48 is appropriately selected depending on the type of oil-containing sludge, the oil content of the oil-containing sludge, processing conditions, and the like. The

  In addition to the stopper shown in FIG. 4, for example, the screw shaft is inserted, slidably attached to the screw shaft through a bearing or the like, and an elastic body, hydraulic pressure, air pressure on the back surface. For example, a stopper to which a pressure adjusting member that applies pressure 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 a 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, and the discharge amount of the residue, the compression rate, etc. The processing conditions can be selected. Further, processing conditions can be selected depending on the type and physical properties of the object to be processed.

  The oil-containing sludge supply port 40 is a supply port for supplying oil-containing sludge into the inner cylinder 35. As shown in FIG. 7, the installation position of the oil-containing sludge supply port 40 in the oil-containing sludge movement direction 64 is from the cylinder end 49 on the oil-containing sludge supply side of the inner cylinder 35 to the length 61 of the inner cylinder 35. The ratio of the length 63 to the oil-impregnated sludge supply port 40 (reference numeral 63 / reference numeral 61) is 0.15 or less, preferably 0.125 or less, and particularly preferably 0.093 to 0.125. The ratio of the length 63 from the cylinder end 49 on the oil-containing sludge supply side of the inner cylinder 35 to the oil-containing sludge supply port 40 with respect to the length 61 of the inner cylinder 35 is within the above range, so that the oil content of the oil-containing sludge is reduced. Increases the weight reduction effect. In the present invention, the length 61 of the inner cylinder 35 refers to the distance from the cylinder end 49 on the oil-impregnated sludge supply side of the inner cylinder to the cylinder end 48 on the residue discharge side of the inner cylinder, The position of the oil-containing sludge supply port 40 refers to the center position of the oil-containing sludge supply port 40. Further, the installation position of the oil-impregnated sludge supply port 40 in the circumferential direction of the inner cylinder 35 and the outer cylinder 36 is usually the uppermost position as shown in FIGS. 4 and 7, but is limited to this. It is not a thing, but it selects suitably by the position of the oil-impregnated sludge supply pipe which is not illustrated.

  The outer cylinder side water vapor supply port 41 supplies water vapor for supplying water vapor to the oil-impregnated sludge in the inner cylinder 35 from the inner cylinder 35 side, that is, from the outside of the inner cylinder 35 toward the center. The mouth. As shown in FIG. 7, the installation position of the outer cylinder-side water vapor supply port 41 in the moving direction of the oil-containing sludge is as follows. The ratio of the length 62 from the outer cylinder side water vapor supply port 41 (reference numeral 62 / reference numeral 61) is 0.5 or less, preferably 0.03 to 0.5, particularly preferably 0.14 to 0.3. More preferably, the position is 0.18 to 0.25. The ratio of the length 62 from the cylinder end 49 on the oil-impregnated sludge supply side of the inner cylinder 35 to the length 61 of the inner cylinder 35 to the outer cylinder-side water vapor supply port 41 is within the above range. 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 cylinder 35, 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 41 refers to the center position of the outer cylinder side water vapor supply port 41.

  Moreover, although the installation position of the outer cylinder side water vapor supply port 41 in the circumferential direction of the outer cylinder 36 is the lowermost in FIGS. 4 and 7, it is not limited to this and is not shown in the figure. It is appropriately selected depending on the position of the tube. The number of the outer cylinder side water vapor supply ports 41 is not particularly limited, and may be 1 or 2 or more. The steam supplied from the outer cylinder side steam supply port has an action of heating the oil-containing sludge by the temperature, an action of increasing the contact efficiency by scattering the oil-containing sludge in the inner cylinder by the pressure, An effect of preventing clogging of the passage hole of the oil water in the cylinder is exhibited.

  The oil water discharge port 43 is a discharge port for discharging the oil water discharged into the oil water discharge gap 52 to the outside of the apparatus. The installation position of the oil / water discharge port 43 and the number of the oil / water discharge ports 43 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 43 in the circumferential direction of the outer cylinder 36 is usually at the lowest position. Further, the strainer 431 for separating fine residue mixed in the oil water is attached to the oil water discharge port 43.

  The exhaust port 46 is a gas exhaust port for exhausting a gas such as water vapor in the apparatus to the outside of the apparatus. The installation position of the exhaust ports 46 and the number of the exhaust ports 46 in the moving direction of the oil-containing sludge are not particularly limited and are appropriately selected.

  When water vapor is brought into contact with the oil-containing sludge, steam such as hydrocarbons is generated. Therefore, it is preferable to install a cooling means at the exhaust port 46 in order to recover them.

  The screw-type oil-impregnated sludge reducing device 31 is provided with driving means (not shown) for rotating the screw 34.

  In the screw-type oil-impregnated sludge reducing device 31, the screw shaft 32 and the inner cylinder 35 may be horizontal, may be inclined to the oil-containing sludge supply side, and may be disposed on the residue discharge side. It may be inclined or may be vertical.

  An operation procedure for performing the oil-impregnated sludge reduction method B of the present invention using the screw-type oil-impregnated sludge reducer 31 will be described with reference to FIG. FIG. 8 is a schematic view of the screw-type oil-impregnated sludge reducing device 31 showing how the screw-type oil-containing sludge reducing device 31 is used for the oil-containing sludge reducing method B of the present invention. FIG.

  By supplying oil-containing sludge 71 from the oil-containing sludge supply port 40 to the screw-type oil-containing sludge reduction device 31 and rotating the screw 34, the oil-containing sludge 71 is supplied to the oil-containing sludge supply port 40. From the inner cylinder toward the cylinder end 48 on the residue discharge side by moving the compressed space 47 formed in a spiral around the screw shaft 32 and pushing the oil-containing sludge 71, A high pressure is applied to the oil-containing sludge 71 to compress the oil-containing sludge 71. While supplying the oil-containing sludge, 130 to 160 ° C. and 0.27 to 0.62 MPa of water vapor 70 a are supplied from one end 58 of the screw shaft 32, and 130 to 160 ° C. from the outer cylinder side water vapor supply port 41. Further, by supplying the steam 70b of 0.27 to 0.62 MPa, the steam is brought into contact with the oil-containing sludge 71 from both the center and the outside of the inner cylinder 35.

  Therefore, the oil-containing sludge supplied from the oil-containing sludge supply port 40 immediately after being supplied to the inner cylinder 35, the water vapor 70a from the water vapor supply hole 57 of the screw shaft 32 and the outer cylinder-side water vapor supply port. 41 contacts the water vapor 70b. Next, the oil-containing sludge 71 moves to the compressed product discharge side while being compressed by the rotation of the screw 34, and during that time, from the water vapor 70 a from the water vapor supply port 57 and the outer cylinder side water vapor supply port 41. Of water vapor 70b. In other words, the water vapor is kept in contact with the oil-containing sludge 41 during pressing.

  And while rotating the screw 34, supplying the steam 70a and 70b, supplying the oil-containing sludge 71 continuously, and discharging the residue 73, the oil-containing sludge is continuously discharged. 71 oils and harmful substances can be reduced. At that time, the oil water 72 is appropriately discharged from the oil water discharge port 43, and the exhaust gas 75 is discharged from the exhaust port 46.

  Thus, in the method B for reducing oil-containing sludge according to the present invention, the oil-containing sludge is brought into contact with water vapor at 130 to 160 ° C. and 0.27 to 0.62 MPa, and then the oil-containing sludge is compressed, This is a method for reducing the amount of oil-containing sludge separated into the residue. And the oil-reducing sludge reduction method B of the present invention is a method for continuously treating the oil-containing sludge.

  During the pressing, the oil-impregnated sludge 71 is heated by steam supplied into the screw-type oil-impregnated sludge reducing device 31, and the temperature of the steam supplied is 130 to 160 ° C., preferably 130 to 160 ° C. 150 ° C. When the temperature of the water vapor to be supplied is less than the above range, it becomes difficult to separate the oil and residue in the oil-containing sludge, or it takes a long time to separate, and the processing efficiency deteriorates. The amount of oil in the oil-containing sludge becomes steam becomes too large. The pressure of the water vapor to be supplied is 0.27 to 0.62 MPa, preferably 0.27 to 0.48 MPa. Since the high-pressure steam collides with the oil-containing sludge when the pressure of the water vapor to be supplied is within the above range, the oil-containing sludge is scattered in the inner cylinder. In addition, the high-pressure water vapor from the outer cylinder side passes through the oil water passage hole of the inner cylinder, so that the oil water passage hole is not easily clogged. And, in the method B for reducing oil-containing sludge of the present invention, the temperature and pressure of the water vapor to be supplied are within the above range, so that the oil and harmful substances in the oil-containing sludge can be reduced well. it can.

The amount of the water vapor to be supplied is preferably a ratio of the water supply amount to the oil-containing sludge supply amount (water vapor supply amount (tons) / oil-containing sludge supply amount (m ³ )), preferably 0.5. 1.5 tons / ^{m 3,} particularly preferably in an amount comprised 1.0 to 1.5 tons / ^{m 3.} When the steam is supplied from both the steam supply hole 57 of the screw shaft 32 and the outer cylinder side steam supply port 41 as in the screw-type oil-impregnated sludge reducing device 31, The ratio of the steam supply amount to the oil-containing sludge supply amount is the sum of the steam amount supplied from the steam supply hole 57 of the screw shaft 32 and the steam amount supplied from the outer cylinder side steam supply port 41. The amount is calculated as the feed rate of the water vapor.

  Further, the temperature in the screw-type oil-containing sludge reducing device 31 during the pressing is 110 to 160 ° C, preferably 120 to 150 ° C, in a steady state temperature. When the temperature in the screw-type oil-containing sludge reducing device 31 during the pressing is within the above range, the oil content in the oil-containing sludge 71 can be reduced well. Note that the temperature in the screw-type oil-containing sludge reducing device 31 during the compression is such that a thermocouple or the like is installed in the oil water discharge gap 52 at a position that does not directly contact the supplied steam. It is obtained by measuring the temperature of the discharge gap 52.

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

  The pressing time of the oil-containing sludge 71 during the pressing, that is, the time from when the oil-containing sludge 71 is supplied from the oil-containing sludge supply port 40 until it is discharged as the residue 73 from the discharge gap 45 of the residue. Is preferably 0.5 hours or more, particularly preferably 0.5 to 1.5 hours, and further preferably 1.0 to 1.5 hours. When the pressing time of the oil-containing sludge 71 during the pressing is within the above range, the effect of reducing the amount of oil and harmful substances in the oil-containing sludge 71 is enhanced. On the other hand, even if the squeezing time is too long, the effect of the present invention is obtained, but the improvement of the effect of the present invention reaches its peak, and the processing efficiency deteriorates. In the screw-type oil-impregnated sludge reducing device 31, the rotational speed of the screw 34, the supply amount of the oil-containing sludge 71 from the oil-containing sludge supply port 40, and the residue from the discharge gap 45 of the residue By appropriately selecting the discharge amount of the object 73, it is possible to adjust the pressing time of the oil-containing sludge 71 during the pressing.

  In the method B for reducing the amount of oil-impregnated sludge according to the present invention, the oil-impregnated sludge is heated to a high temperature by bringing the oil-impregnated sludge 71 into contact with the steam 70 at a specific temperature and a specific pressure immediately after the supply of the oil-containing sludge and during pressing. Due to the temperature effect, the solid content and the liquid content in the oil-containing sludge 71 are easily separated. Therefore, the method B for reducing oil-containing sludge according to the present invention can favorably reduce the oil content and harmful substances in the oil-containing sludge 71.

  Further, in the screw-type oil-impregnated sludge reducing device 31, the steam supply hole 57 is formed in the screw shaft 32, and the cylinder end of the inner cylinder on the oil-impregnated sludge supply side with respect to the length of the inner cylinder Since the ratio of the length from the outer cylinder side steam supply port to 0.5 or less, the oil-impregnated sludge can be brought into contact with the steam immediately after the oil-impregnated sludge is put into the inner cylinder 35. Therefore, the screw-type oil-impregnated sludge reducing device 31 is preferably used in the oil-containing sludge reducing method B of the present invention.

  In the method for reducing oil-containing sludge according to the present invention, the method for reducing oil-containing sludge according to the present invention is performed once again on the residual sludge obtained by performing the method for reducing oil-containing sludge according to the present invention. Good.

  EXAMPLES Next, although an Example is given and this invention is demonstrated more concretely, this is only an illustration and does not restrict | limit this invention.

(Screw-type oil-impregnated sludge reduction device)
This was carried out using a screw type oil-impregnated sludge reducing device 31 shown in FIGS. In addition, as the stopper 37, what was attached to the screw shaft 32 so that sliding was possible, and has a pressure regulation member which regulates a pressure with an air pressure was used. The details of the screw-type oil-impregnated sludge reducing device 31 are as follows.
Range where water vapor supply holes are formed: From the cylinder end on the oil-impregnated sludge supply side to a position 2/3 of the length of the inner cylinder Number of water supply ports on the outer cylinder: 3 locations

Example 1
While rotating the screw, supplying oil-impregnated sludge from the oil-impregnated sludge supply port 40, supplying water vapor from the water vapor supply hole of the screw shaft and the outer cylinder side water vapor supply port, and compressing the oil-containing sludge under the following conditions went. As a result, the amount of the collected residue was about 1/200 of the supplied oil-containing sludge.
(conditions)
Oil-containing sludge: Crude oil sludge, oil content 78.9 wt%
Oil-containing sludge supply amount: 1 m ³ / hour Screw rotation speed: 0.2 rpm
Pressure of pressure regulating member: 1500kgf
Steam temperature: 150 ° C
Water vapor pressure: 0.48 MPa
Steam supply: 1 ton / hour Steam supply / oil-containing sludge supply: 1 ton / m ³
Processing time: 1.5 hours ¹⁾
1) The processing time refers to the time from the start of processing the oil-containing sludge to the end of the discharge of the oil-containing sludge.

(Example 2)
The procedure was the same as in Example 1 except that the following conditions were used. As a result, the amount of the recovered residue was about 1/195 of the supplied oil-containing sludge.
(conditions)
Oil-containing sludge: Crude oil sludge, oil content 78.9 wt%
Oil-containing sludge supply amount: 1 m ³ / hour Screw rotation speed: 0.2 rpm
Pressure of pressure regulating member: 1500kgf
Steam temperature: 130 ° C
Water vapor pressure: 0.27 MPa
Steam supply: 1 ton / hour Steam supply / oil-containing sludge supply: 1 ton / m ³
Processing time: 1.5 hours

(Comparative Example 1)
The procedure was the same as in Example 1 except that the following conditions were used. As a result, the amount of the collected residue was about 1/170 of the supplied oil-containing sludge. At this time, the oil content in the collected residue was larger than that in Example 1.
(conditions)
Oil-containing sludge: Crude oil sludge, oil content 78.9 wt%
Oil-containing sludge supply amount: 1 m ³ / hour Screw rotation speed: 0.2 rpm
Pressure of pressure regulating member: 1500kgf
Steam temperature: 100 ° C
Water vapor pressure: 0.1 MPa
Steam supply: 1 ton / hour Steam supply / oil-containing sludge supply: 1 ton / m ³
Treatment time: 1.5 hours When the water vapor temperature is 100 ° C. and the pressure is 0.1 MPa, the treatment time is about doubled to reduce the amount of oil-containing sludge to the same extent as in Example 1. The processing efficiency has deteriorated.

(Comparative Example 2)
The procedure was the same as in Example 1 except that the following conditions were used. As a result, the amount of the collected residue was the same as that in Example 1. However, a large amount of hydrocarbon vapor was generated.
(conditions)
Oil-containing sludge: Crude oil sludge, oil content 78.9 wt%
Oil-containing sludge supply amount: 1 m ³ / hour Screw rotation speed: 0.2 rpm
Pressure of pressure regulating member: 1500kgf
Steam temperature: 180 ° C
Water vapor pressure: 1.0 MPa
Steam supply: 1 ton / hour Steam supply / oil-containing sludge supply: 1 ton / m ³
Processing time: 1.5 hours

DESCRIPTION OF SYMBOLS 10 Compression piston type oil-impregnated sludge reduction device 11, 35 Inner cylinder 12, 36 Outer cylinder 13a, 13b, 52 Oil water discharge gap 14 Steam supply port 15, 43 Oil water discharge port 16, 46 Exhaust port 17 Base 18 Press piston 19 Upper flange 21 Position before pressing 22 Position after pressing 31 Screw type oil-impregnated sludge reduction device 32 Screw shaft 33 Screw blade 34 Screw 37 Stopper 38 Oil-containing sludge supply side flange 39 Residue discharge side flange 40 Oil-containing sludge supply port 41 Outer cylinder side water vapor supply port 42 Residue discharge port 44 Residue discharge chamber 45 Residue discharge gap 47 Compression space 48 Cylinder end 49 on the inner cylinder residue discharge side Cylinder end 50 on the inner cylinder oil-impregnated sludge supply side Outside The cylinder end 51 on the oil-impregnated sludge supply side of the cylinder is surrounded by the inner cylinder 35 on the cylinder end 53 on the residue discharge side of the outer cylinder. The portion 54 where the water vapor supply hole 57 is formed 55 The diameter 56 of the screw blade 33 The pitch 57 of the screw blade 33 57 The water vapor supply hole 58 One end 59 of the screw shaft 32 The other end 61 of the screw shaft 32 The length 62 of the inner cylinder 35 Length 63 from the cylinder end 49 on the oil-impregnated sludge supply side of the cylinder 35 to the outer cylinder-side water vapor supply port 41 Length 64 from the cylinder end 49 on the oil-impregnated sludge supply side of the inner cylinder 35 to the oil-impregnated sludge supply port 40 Movement direction 70a, 70b Water vapor 71 Oil-containing sludge 72 Oil water 73 Residue 75 Exhaust gas 111 Bottom wall 431 Strainers 561a, 561b Apex of screw blades

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

Claims (2)

A method for reducing the amount of oil-containing sludge in which water vapor is brought into contact with oil-containing sludge, and then the containing sludge is squeezed and separated into oil water and residue,
The temperature of the water vapor contacted with the oil-containing sludge is 130 to 160 ° C., and the pressure of the water vapor is 0.27 to 0.62 MPa,
A method for reducing the amount of oil-impregnated sludge. A screw shaft having a water vapor 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 installed outside the inner cylinder and forming 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 that is installed in the vicinity of the cylinder end on the residue discharge side of the inner cylinder, and that forms a discharge gap for the residue between 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;
Using a device for reducing oil-containing sludge having
The oil-containing sludge and the steam are brought into contact with each other by supplying steam at 130 to 160 ° C. and 0.27 to 0.62 MPa from the screw shaft and the outer cylinder side steam supply port. Item 2. A method for reducing oil-containing sludge according to Item 1.

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