CN217677232U - Pretreatment equipment - Google Patents

Abstract

The application specifically provides a pretreatment equipment, including first agitating unit and second agitating unit, first agitating unit is configured to carry to the oil sludge separation equipment after the homogeneous mixing of fatlute, the second agitating unit is configured to with the solid phase homogeneous mixing that the oil sludge separation equipment separated from the fatlute to solid phase after will mixing transports back the oil sludge separation equipment. After the pretreatment of the first stirring device and the second stirring device, the working efficiency of the oil-sludge separation equipment can be effectively improved, and the oil sludge is fully treated.

Description

Pretreatment equipment

Technical Field

The application relates to the technical field of oil sludge treatment, in particular to a pretreatment device.

Background

The oil sludge is oil-containing solid waste generated in the processes of oil exploitation, transportation, refining and oily sewage treatment, belongs to HW08 type hazardous waste in hazardous waste management catalogues, and is one of main pollutants generated in the processes of oil and gas development, storage and transportation. The oil sludge is not only waste produced in the production process of oil fields, but also a resource, and if the oil sludge is not treated to recover the oil content in the oil sludge, the resource waste is caused, and the environment is polluted. With the continuous emphasis on environmental protection and the continuous enhancement of law enforcement on environmental protection in China, oil sludge gradually becomes one of the environmental problems which need to be mainly solved.

The prior treatment method of the oil sludge has low efficiency, and the oil content of the treated solid phase tailings is high, generally 5-10 percent, and the oil sludge is difficult to meet the landfill requirement.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problems of low efficiency and high oil content of solid phase tailings of the conventional oil sludge treatment method, the application provides pretreatment equipment.

The application provides a pretreatment device, including:

a first stirring device, wherein the first stirring device is configured to uniformly mix oil sludge and convey the oil sludge to an oil sludge separation device;

a second stirring device configured to homogeneously mix solid phases separated from the oil sludge by the oil sludge separation facility and to transport the mixed solid phases back to the oil sludge separation facility.

In one embodiment of the present disclosure, the sludge separation apparatus comprises a cavitation device and a solid-liquid separation device,

the first stirring device is configured to uniformly mix the oil sludge and convey the oil sludge to the cavitation device,

the cavitation device is configured to transport the sludge to the solid-liquid separation device after cavitation treatment,

the solid-liquid separation device is configured to perform solid-liquid separation of the oil sludge and convey the separated solid phase to the second agitation device,

the second stirring device is configured to uniformly mix the solid phase and convey the solid phase to the cavitation device.

In one embodiment of the present disclosure, further comprising a water supply channel configured to provide water to the sludge in the first agitation device and/or the solid phase in the second agitation device.

In one embodiment of the disclosure, the first agitation device is configured to cause the solid phase of the sludge to account for 15% to 30% of the total volume of the sludge by adding water to the sludge; and/or the second stirring device is configured to enable the solid phase to occupy 15% -30% of the total volume of the solid and liquid by adding water to the solid phase.

In an embodiment of the disclosure, the water provided by the water supply channel is water separated from sludge by the sludge separation apparatus.

In one embodiment of the disclosure, the first agitation device comprises a first container for containing sludge, and a first agitation assembly for agitating the sludge in the first container; the second stirring device comprises a second vessel for containing the solid phase and a second stirring assembly for stirring the solid phase in the second vessel.

In one embodiment of the present disclosure, an oil spill port through which the floating oil in the sludge overflows is provided in an upper portion of the first tank and/or the second tank.

In an embodiment of the disclosure, the method further comprises heating the sludge in the first stirring device and/or the solid phase in the second stirring device.

In one embodiment of the disclosure, the heating means comprises a heating coil coiled around the first vessel and/or the second vessel, the heating coil being used to transport a medium that is arranged to exchange heat with the sludge in the first stirring means and/or the solid phase in the second stirring means through the wall of the heating coil.

In one embodiment of the present disclosure, further comprising a first loading device in communication with the first agitating device, the first loading device configured to transport sludge to the first agitating device; and/or the presence of a gas in the atmosphere,

the device also comprises a second feeding device communicated with the second stirring device and the oil-sludge separation equipment, and the oil-sludge separation equipment conveys a solid phase to the second stirring device through the second feeding device.

In the pretreatment equipment of this application, earlier through first agitating unit with fatlute misce bene, then carry out solid-liquid separation with fatlute through fatlute splitter, the solid phase of separation communicates with the second agitating unit misce bene, then send into again and handle in the fatlute splitter, through the follow-up back of handling of first agitating unit and second agitating unit, can effectively improve fatlute splitter's work efficiency, carry out the intensive processing to fatlute.

Drawings

FIG. 1 is a schematic structural diagram of a pre-processing apparatus according to an embodiment of the present disclosure;

fig. 2 is a schematic structural diagram of a pretreatment plant and a sludge separation plant according to an embodiment of the present application.

The one-to-one correspondence between component names and reference numbers in fig. 1-2 is as follows:

1. a first stirring device; 11. a first container; 12. a first stirring assembly; 13. a first feeding device; 2. a second stirring device; 21. a second container; 22. a second stirring assembly; 23. a second feeding device; 3. a water supply channel; 4. a heating device; 5. a cavitation device; 6. a solid-liquid separation device; 7. a sewage treatment system; 71. an air floatation device; 72. a heater.

Detailed Description

In order to make the purpose, technical solution and beneficial technical effects of the present application clearer, the present application is described in detail with reference to specific embodiments below. It should be understood that the embodiments described in this specification are only for the purpose of explaining the present application and are not intended to limit the present application.

For the sake of brevity, only some numerical ranges are explicitly disclosed herein. However, any lower limit may be combined with any upper limit to form ranges not explicitly recited; and any lower limit may be combined with any other lower limit to form a range not explicitly recited, and any upper limit may be combined with any other upper limit to form a range not explicitly recited. Further, although not explicitly recited, every point or individual value between endpoints of a range is encompassed within the range. Thus, each point or individual value may, as its lower or upper limit, be combined with any other point or individual value or with other lower or upper limits to form ranges not explicitly recited.

The above summary of the present application is not intended to describe each disclosed embodiment or every implementation of the present application. The following description more particularly exemplifies illustrative embodiments. At various points throughout this application, guidance is provided through lists of examples, which examples can be used in various combinations. In each instance, the list is provided only as a representative group and should not be construed as exhaustive.

The application provides a pretreatment equipment, with the oil sludge separation equipment cooperation, can be used for handling the fatlute of different grade types such as fatlute, clear jar fatlute, ageing fatlute of falling to the ground. As shown in fig. 1, the pretreatment equipment comprises a first stirring device 1 and a second stirring device 2, wherein the first stirring device 1 is used for uniformly mixing oil sludge and then conveying the oil sludge to the oil sludge separation equipment for solid-liquid separation treatment. The second stirring device 2 is configured to uniformly mix the solid phases separated by the sludge separation facility, and to send the mixed solid phases back to the sludge separation facility to be subjected to separation treatment again.

In one embodiment of the present disclosure, as shown in fig. 1 and 2, the sludge separation apparatus includes a cavitation device 5 and a solid-liquid separation device 6. The first stirring device 1 communicates with the cavitation device 5, and conveys the uniformly mixed sludge to the cavitation device 5. The cavitation device 5 can generate cavitation bubbles in the oil sludge, and the combination of oil, sludge and water is destroyed through cavitation, so that the oil sludge water particles are dispersed again. The cavitation device 5 communicates with the solid-liquid separator 6, and conveys the treated sludge to the solid-liquid separator 6 for solid-liquid separation, and separates a solid phase and a liquid phase. The solid phase separated by the solid-liquid separation device 6 can be discharged from the oil-sludge separation equipment or enter the oil-sludge separation equipment again for treatment, so that the oil content is further reduced.

The solid-liquid separation device 6 communicates with the second stirring device 2, and conveys the solid phase to be further processed to the second stirring device 2. The second stirring device 2 is communicated with the cavitation device 5, the second stirring device 2 uniformly mixes the solid phase and then conveys the solid phase to the cavitation device 5 for cavitation treatment, and the solid phase after the cavitation treatment is conveyed to the solid-liquid separation device 6 for solid-liquid separation. The unqualified solid phase can be repeatedly processed for several times until the solid phase separated by the solid-liquid separation device 6 reaches the qualified standard.

In one embodiment of the present disclosure, as shown in fig. 1, the first stirring device 1 includes a first container 11 for containing sludge, and a first stirring assembly 12 for stirring the sludge in the first container 11. Specifically, the first stirring assembly 12 includes a stirring paddle disposed in the first container 11, and a motor driving the stirring paddle to rotate so as to stir the oil sludge, and the oil sludge is uniformly mixed by a stirring action of the stirring paddle. The first tank 11 communicates with the cavitation device 5 through a transfer passage, and the well-stirred sludge can be transported to the cavitation device 5 through the transfer passage.

The second stirring device 2 comprises a second container 21 for containing sludge and a second stirring assembly 22 for stirring the solid phase in the second container 21. Specifically, the second stirring assembly 22 includes a stirring paddle disposed in the second container 21, and a motor for driving the stirring paddle to rotate to stir the sludge, and the solid phase is uniformly mixed by the stirring action of the stirring paddle. The second container 21 is respectively communicated with the solid-liquid separation device 6 and the rotary cavitation device 5 through a conveying channel, a solid phase separated by the solid-liquid separation device 6 can be conveyed into the second container 21 through the conveying channel, and the solid phase is uniformly stirred in the second container 21 through the second stirring assembly 22 and then conveyed into the cavitation device 5 through the conveying channel.

The outlets of the first container 11 and the second container 21 can be communicated with the cavitation device 5 through the same conveying channel. Alternatively, the outlets of the first and second containers 11, 21 may communicate with the cavitation device 5 through different delivery paths. The oil sludge uniformly stirred in the first container 11 and the solid phase uniformly stirred in the second container 21 can be conveyed to the same conveying channel for mixing, and the mixed oil sludge and the solid phase are conveyed to the cavitation device 5 through the conveying channel; it is also possible to feed them separately into the same conveying channel and to feed them separately through the conveying channel into the cavitation device 5. The transfer passage may provide motive force to the sludge or solid phase by a centrifugal pump.

In one embodiment of the present disclosure, as shown in fig. 1, the pretreatment apparatus further includes a water supply channel 3, and the water supply channel 3 is communicated with at least one of the first stirring device 1 and the second stirring device 2, and is used for adding water to the sludge in the first stirring device 1 and/or the solid phase in the second stirring device 2 to adjust the solid-liquid content. In one embodiment shown in fig. 1, the first container 11 and the second container 21 are provided with water injection ports, and the water supply channel 3 may be communicated with the water injection ports of the first container 11 and the second container 21 through a tee joint, so as to add water into the oil sludge or the solid phase, which is beneficial to uniformly stirring the oil sludge.

In one embodiment of the disclosure, water is added into the oil sludge through the water supply channel 3 by the first stirring device 1, so that the solid phase of the oil sludge accounts for 15% -30% of the total volume of the oil sludge; and/or adding water into the solid phase through the water supply channel 3 by the second stirring device 2, so that the solid phase accounts for 15-30% of the total volume of the solid and the liquid.

In one embodiment of the present disclosure, the first stirring device 1 and/or the second stirring device 2 is provided with an oil overflow port (not shown), which may be disposed on the top, the side wall or other position of the first container 11 and/or the second container 21. By adding water to the first container 11 and/or the second container 21, the oil in a free state in the oil sludge or the solid phase can float on the upper layer, and after the liquid level reaches the oil overflow port, the floating oil on the upper layer can flow out from the oil overflow port, so that a part of the oil in the oil sludge is removed. The oil spilling ports of the first container 11 and/or the second container 21 may communicate with an oil storage tank or other container to collect the floating oil.

In one embodiment of the present disclosure, the water added to the first stirring device 1 and/or the second stirring device 2 may be hot water, and the temperature of the hot water may be controlled between 75 ℃ and 85 ℃. The freezing point of the conventional crude oil is usually lower than 40 ℃, and when the temperature is too low, the crude oil is in a freezing state and has poor liquidity. The temperature of the oil sludge can be increased by adding hot water into the oil sludge or the solid phase, the fluidity of the oil can be increased, and the crude oil in a flowing state can be separated more easily. The crude oil in the flowing state in the oil sludge or the solid phase can float on the upper layer, and the removal of the floating oil on the upper layer is facilitated. Preferably, the hot water temperature is controlled at 80 ℃. Through test, the pretreatment effect is optimal when the water temperature is about 80 ℃, so that the crude oil has better fluidity and lower energy consumption.

In one embodiment of the present disclosure, the pretreatment apparatus further comprises a heating device 4, and the heating device 4 is used for heating the sludge in the first stirring device 1 and/or the solid phase in the second stirring device 2, so as to facilitate the removal of the floating oil in the sludge or the solid phase. Preferably, the heating means 4 maintains the temperature of the sludge and/or solid phase at 75-85 ℃. The pretreatment equipment can be completed at normal temperature or slightly higher than the normal temperature, has low energy consumption, can treat the frozen oil sludge by maintaining the temperature through the heating device 4, and solves the problem that the oil sludge cannot be treated in winter at present.

In one embodiment of the present disclosure, as shown in fig. 1, the heating device 4 comprises a heating coil wound around the first container 11 and/or the second container 21 for transporting a medium, which is capable of exchanging heat with the sludge in the first stirring device 1 and/or the solid phase in the second stirring device 2 through the wall of the heating coil, thereby achieving a heating effect. The medium in the heating coil may be hot water, water vapor, or the like. When hot, the skilled person can also choose other types of heating means 4, such as heating wires.

In one embodiment of the present disclosure, as shown in fig. 1 and 2, the pretreatment apparatus further includes at least one of a first feeding device 13 and a second feeding device 23. The first loading device 13 communicates with the first stirring device 1, and transports the sludge to the first stirring device 1. The second feeding device 23 is connected between the second stirring device 2 and the solid-liquid separation device 6, and the solid-liquid separation device 6 feeds the solid phase to the second stirring device 2 through the second feeding device 23. In detail, the first feeding device 13 may be a screw conveyor, the inlet of which is provided with a hopper and the outlet of which communicates with the first container 11. The sludge is poured through a hopper into a screw conveyor and then transferred to the first vessel 11. The second feeding device 23 may be a screw conveyor, an inlet of which communicates with the solid phase outlet of the solid-liquid separator 6 and an outlet of which communicates with the second container 21, and the solid phase separated by the solid-liquid separator 6 is transferred to the second feeding device 23 and then to the second container 21.

In one embodiment of the present disclosure, if the oil content of the solid phase separated by the solid-liquid separation device 6 reaches a predetermined index, the solid phase can be directly discharged or further processed and utilized; if the oil content of the solid phase separated by the solid-liquid separation device 6 does not reach a predetermined index, the solid phase is further treated by an oil-sludge separation device.

In one embodiment of the present disclosure, the solid phase separated by the solid-liquid separation device 6 is subjected to oil content detection, and if the oil content of the solid phase separated by the solid-liquid separation device 6 reaches a predetermined index, the solid phase can be directly discharged or further processed and utilized, such as brick firing, paving and the like; if the oil content of the solid phase separated by the solid-liquid separation device 6 does not reach the preset index, the solid phase is further treated by oil-sludge separation equipment until the oil content reaches the preset index.

For example, the solid phase separated by the solid-liquid separation device 6 has the standard of solid phase qualification that the oil content is not more than 0.3 percent and can reach the agricultural soil requirement index. The solid phase which is separated by the solid-liquid separation device 6 and does not reach the qualified standard is conveyed back to the second stirring device 2 to be uniformly stirred, and then is sequentially conveyed to the cavitation device 5 and the solid-liquid separation device 6 from the second stirring device 2 to be treated. The unqualified solid phase can be repeated for a plurality of times through the processes until the solid phase separated by the solid-liquid separation device 6 reaches the qualified standard.

Specifically, the solid-liquid separation device 6 may be a horizontal screw centrifuge, and separates a solid phase from a liquid phase by centrifugation. Specifically, the non-qualified solid phase separated by the horizontal screw centrifuge may be transferred to the second stirring device 2 through the second feeding device 23. The solid-liquid separator 6 may be any other type of device, such as a butterfly centrifuge, as long as it can separate the solid phase and the liquid phase from the sludge.

In one embodiment of the present disclosure, as shown in fig. 2, the sludge separation facility further includes a sewage treatment system 7, the sewage treatment system 7 communicates with the solid-liquid separation device 6, and the liquid phase separated by the solid-liquid separation device 6 is sent to the sewage treatment system 7. The sewage treatment system 7 is used for carrying out oil-water separation on the liquid phase separated by the solid-liquid separation device 6 to separate oil and water. Specifically, the sewage treatment system 7 includes an air flotation device 71, and the air flotation device 71 is communicated with the horizontal screw centrifuge to further separate oil and water from the liquid phase separated by the horizontal screw centrifuge.

In one embodiment of the present disclosure, the sewage treatment system 7 may further communicate with the water supply channel 3 of the pretreatment apparatus, and the separated water is transported to the first stirring device 1 and the second stirring device 2 through the water supply channel 3 for recycling. The sewage treatment system 7 may provide power to the liquid by a power device such as a vane pump. Specifically, the air flotation device 71 performs oil-water separation on the liquid phase, discharges the separated water through a water outlet, communicates the water outlet with the water supply channel 3, and adds the separated water into the first stirring device 1 and/or the second stirring device 2. Of course, the water supply channel 3 of the pretreatment apparatus may be connected to other water sources such as tap water to add water to the first stirring device 1 and the second stirring device 2.

In one embodiment of the present disclosure, the sewage treatment system 7 further comprises a heater 72, and the heater 72 is used for heating the water separated by the air flotation device 71 to heat the water conveyed to the water supply channel 3 to be hot water of 75-85 ℃. Hot water is fed to the first stirring apparatus 1 and the second stirring apparatus 2, and the fluidity of the crude oil in the oil sludge or solid phase can be improved.

The pretreatment equipment can also comprise a control unit, and the control unit controls the motors of the first stirring device 1 and the second stirring device 2 to drive the stirring paddles to stir the oil sludge or the solid phase. The control unit can also control the first feeding device 13 and the second feeding device 23 to feed materials, and control the first stirring device 1 and the second stirring device 2 to convey the materials to the cavitation device 5 through the conveying channel. The control unit can include PCL, can remote control start-stop, also can operate on the spot, and is safe convenient.

The pretreatment equipment and the oil sludge separation equipment can be in skid-mounted mobile design, and the first stirring device 1, the second stirring device 2, the cavitation device 5, the solid-liquid separation device 6, the sewage treatment system 7 and the like are arranged on a movable chassis so as to be convenient to move. Each device can be flexibly combined according to the state of the oil sludge on site, the floor area is reduced, the source treatment can be realized, and the transportation cost and the influence of the environment are reduced.

During oil well production and downhole operation, part of the crude oil is blown out or carried to the land or well site by tubing, sucker rods, pumps and other downhole tools, and the crude oil permeates into the ground soil to form oil sludge on the ground. The oil sludge falling to the ground contains more impurities such as soil, stones, branches and the like, and the impurities need to be separated out before treatment.

In an embodiment of the disclosure, when the pretreatment equipment is used for treating the oil sludge falling to the ground, the pretreatment equipment further comprises a bag breaking device and a screening device. The oil sludge is usually collected in bags for transportation and transfer. For example, the bagged landed sludge can be fed into the bag breaking device by a gantry crane and a long-arm claw machine. The bag breaking device is used for breaking the bagged falling oil sludge and spilling the falling oil sludge in the bag. The bag breaking device can be an automatic bag breaking machine, a bag opening machine and the like. The export of broken bagging apparatus can communicate with screening plant, will fall to the ground fatlute and transport to screening plant. The screening device is used for screening the oil sludge falling to the ground and removing impurities such as soil, stones and the like. The screening device may be a vibrating screen, a trommel or other known apparatus. The screening device is communicated with the first stirring device 1, and the screened ground oil sludge is conveyed to the first stirring device 1.

After the oil sludge is produced, the oil sludge is not treated for a long time to form aged oil sludge, the oxidation is obvious, the heavy component is high, the components are complex, and the pretreatment is difficult. The aged oil sludge has high viscosity and is in a solid state or a semi-flowing state.

In one embodiment of the disclosure, when the pretreatment apparatus is used for treating aged sludge, the apparatus further comprises a breaking device. The crushing device can crush the aged oil sludge into smaller particles, and is favorable for uniformly mixing the aged oil sludge by the first stirring device 1. The crushing device comprises a crusher or other devices. The crusher is communicated with the first stirring apparatus 1, and conveys the aged sludge after crushing to the first stirring apparatus 1.

The oil content of the tank cleaning oil sludge is high, the heavy components are high, the crude oil and the sludge are adsorbed more tightly, and the separation is not easy. Tank cleaning sludge is mainly classified into two types: one is produced in the process of treating oil extraction sewage, and a small amount of crude oil sinks to the bottom of an oil storage tank due to the specific gravity factors of fine particles, silt and the like contained in the sewage and colloid asphaltene, heavy metal and the like contained in river swimming, so that oil sludge with black color, fine particles and high oil content is formed; the second type is generated when the oil product storage tank is used for storing crude oil, and when the oil product, particularly the crude oil, is stored for a long time, a small amount of heavy oil components such as mechanical impurities, sand grains, mud, heavy metals, paraffin asphaltene and the like in the oil product naturally settle due to the specific gravity difference and accumulate at the bottom of the oil tank to form black and thick colloid substances.

In one embodiment of the present disclosure, when the pretreatment facility is used for treating tank-cleaned sludge, the first stirring device 1 is provided so as to communicate with the solid-liquid separator 6 of the sludge separation facility. The first stirring device 1 uniformly mixes the clear tank oil sludge, then the clear tank oil sludge is conveyed to the solid-liquid separation device 6 for solid-liquid separation, and the separated solid phase clear tank oil sludge is conveyed back to the first stirring device 1 or conveyed to the second stirring device 2 for uniform mixing again. And (4) conveying the solid-phase tank cleaning oil sludge which is uniformly mixed again to a cavitation device 5 for cavitation treatment, and then conveying the solid-phase tank cleaning oil sludge to a solid-liquid separation device 6 for solid-liquid separation. After the tank cleaning oil sludge is uniformly mixed, subjected to solid-liquid separation and uniformly mixed again, the working efficiency of the cavitation device 5 can be improved, and the full separation of oil, sludge and water is facilitated.

While various embodiments of the present invention have been described above, the above description is intended to be illustrative, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein. The scope of the invention is defined by the appended claims.

Claims (10)

1. A pretreatment apparatus, comprising:

a first stirring device (1), wherein the first stirring device (1) is configured to uniformly mix oil sludge and convey the oil sludge to an oil sludge separation facility;

a second agitation device (2), the second agitation device (2) being configured to homogeneously mix solid phases separated from oil sludge by the oil sludge separation plant and to transport the mixed solid phases back to the oil sludge separation plant.

2. A pre-treatment plant according to claim 1, characterised in that the sludge separation plant comprises a cavitation device (5) and a solid-liquid separation device (6),

the first stirring device (1) is configured to uniformly mix the oil sludge and convey the oil sludge to the cavitation device (5),

the cavitation device (5) is configured to carry out cavitation treatment on the oil sludge and then convey the oil sludge to the solid-liquid separation device (6),

the solid-liquid separation device (6) is configured to perform solid-liquid separation of oil sludge and convey the separated solid phase to the second stirring device (2),

the second stirring device (2) is configured to uniformly mix the solid phase and then convey the solid phase to the cavitation device (5).

3. A pretreatment arrangement according to claim 1, further comprising a water supply channel (3), the water supply channel (3) being configured to provide water to the sludge in the first agitation device (1) and/or the solid phase in the second agitation device (2).

4. A pretreatment apparatus according to claim 3, wherein the first agitation device (1) is configured to cause the solid phase of the sludge to account for 15% to 30% of the total volume of the sludge by adding water to the sludge; and/or the second stirring device (2) is configured to make the solid phase occupy 15% -30% of the total solid-liquid volume by adding water to the solid phase.

5. A pre-treatment plant according to claim 3, characterised in that the water supplied by the water supply channel (3) is water separated from the sludge by the sludge separation plant.

6. A pretreatment apparatus according to claim 1, wherein the first agitation device (1) comprises a first container (11) for containing sludge, and a first agitation assembly (12) for agitating the sludge in the first container (11); the second stirring device (2) comprises a second vessel (21) for containing the solid phase and a second stirring assembly (22) for stirring the solid phase in the second vessel (21).

7. A pretreatment apparatus according to claim 6, characterized in that an upper portion of the first tank (11) and/or the second tank (21) is provided with an oil spill port through which floating oil in sludge overflows.

8. A pretreatment arrangement according to claim 6, further comprising a heating device (4), the heating device (4) being configured to heat the sludge in the first stirring device (1) and/or the solid phase in the second stirring device (2).

9. A pre-treatment plant according to claim 8, characterized in that the heating means (4) comprises a heating coil coiled on the first container (11) and/or the second container (21), the heating coil being used for transporting a medium which is adapted to exchange heat with the sludge in the first stirring means (1) and/or the solid phase in the second stirring means (2) through the wall of the heating coil.

10. The pretreatment apparatus according to any one of claims 1 to 9,

further comprising a first feeding device (13) in communication with the first stirring device (1), the first feeding device (13) being configured to convey sludge to the first stirring device (1); and/or the presence of a gas in the gas,

the device also comprises a second feeding device (23) which is communicated with the second stirring device (2) and the oil-sludge separation equipment, and the oil-sludge separation equipment conveys a solid phase to the second stirring device (2) through the second feeding device (23).

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