CN217677245U - Ageing sludge treatment equipment - Google Patents

Abstract

The application particularly provides aging oil sludge treatment equipment which comprises a pretreatment device, a rotary cavitation device, a jet cavitation device and a solid-liquid separation device, wherein the pretreatment device is used for crushing aging oil sludge and uniformly mixing the crushed aging oil sludge; the rotary cavitation device is used for stirring the aged oil sludge treated by the pretreatment device at a high speed so as to split bubbles generated in the aged oil sludge after the bubbles approach the inner wall of the rotary cavitation device, and the released energy destroys the combination among oil, mud and water, so that oil sludge water particles are dispersed again; the jet cavitation device comprises a venturi in communication with the rotational cavitation device, the venturi configured to jet the aged sludge; the solid-liquid separation device is used for separating solid phase and liquid phase from the aged oil sludge treated by the jet cavitation device. The aged oil sludge treatment equipment can effectively destroy the combination of oil, sludge and water in a physical mode, so that solid-phase tailings with low oil content are separated in the solid-liquid separation process.

Description

Ageing sludge treatment equipment

Technical Field

The application relates to the technical field of oil sludge treatment, in particular to an aging oil sludge treatment device of an oil sludge treatment 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. Generally, the formation of sludge can be classified into ground sludge, tank cleaning sludge, aged sludge, and the like. And the oil sludge is not treated for a long time after being produced to form aged oil sludge, so that the oxidation is obvious, heavy components are high, the components are complex, and the pretreatment is difficult.

Most of the existing oil sludge treatment methods are on-site oil extraction tempering and chemical dosing methods, the treatment cost is high, the oil content of the treated solid-phase tailings is high and is generally 5-10%, and the landfill requirement is difficult to meet.

SUMMERY OF THE UTILITY MODEL

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

The application provides an ageing sludge treatment equipment includes:

the pretreatment device comprises a crushing device for crushing aged oil sludge and a stirring device for uniformly mixing the crushed aged oil sludge;

the rotary cavitation device is communicated with the pretreatment device and is used for stirring the aged oil sludge treated by the pretreatment device at a high speed so that bubbles generated in the aged oil sludge are split after the bubbles approach the inner wall of the rotary cavitation device, and the released energy breaks the combination among oil, mud and water so as to re-disperse the water particles of the oil sludge;

an injection cavitation device comprising a venturi in communication with the rotary cavitation device, the venturi configured to inject aged sludge;

and the solid-liquid separation device is communicated with the jet cavitation device and is used for separating the aged oil sludge treated by the jet cavitation device into a solid phase and a liquid phase.

In one embodiment of the disclosure, the stirring device adds water to the landed sludge so that the solid phase of the landed sludge accounts for 15% to 30% of the total volume of the sludge.

In one embodiment of the present disclosure, the stirring apparatus is provided with an oil overflow port configured to overflow floating oil floating on an upper layer after the aged sludge is added with water.

In one embodiment of the present disclosure, the jet cavitation device includes:

a channel;

a porous venturi tube disposed in the passage and including a plurality of venturi through-holes;

a single bore venturi disposed in the passage;

the aged oil sludge is configured to be ejected through the plurality of venturi through holes of the porous venturi tube and then enter the single-hole venturi tube to be ejected again.

In one embodiment of the disclosure, the aged sludge entering the jet cavitation device is configured to: the diffusion section enters and the contraction section is sprayed out from the plurality of Venturi through holes; and the single-hole Venturi tube enters from the contraction section and is sprayed out from the diffusion section.

In one embodiment of the present disclosure, the solid-liquid separation device is in communication with the stirring device, and the solid phase that has not reached the acceptable standard and has been separated by the solid-liquid separation device is transported to the stirring device.

In one embodiment of the present disclosure, the system further comprises a sewage treatment system, wherein the sewage treatment system is communicated with the solid-liquid separation device and is used for performing oil-water separation on the liquid phase separated by the solid-liquid separation device.

In one embodiment of the present disclosure, the wastewater treatment system is in communication with the agitation device and transports the water separated therefrom to the agitation device.

In one embodiment of the present disclosure, the wastewater treatment system includes a heating device for heating water separated by the wastewater treatment system.

In one embodiment of the present disclosure, the rotary cavitation device is configured to: the volume of the air bubbles in the aged oil sludge is between 50 and 70 percent.

In the aging oil sludge treatment equipment, oil sludge is uniformly mixed through the pretreatment device, oil sludge is stirred at a high speed in the rotary cavitation device, under the high-speed physical crushing action, the supercritical water dissolution action and the hydration heat cracking action, the combination of oil, sludge and water can be damaged, the oil sludge is sprayed in the jet cavitation device, a solid phase and a liquid phase are separated out from the solid-liquid separation device, the oil content of the separated solid phase is low, and the separated liquid phase can be reused.

Drawings

Fig. 1 is a schematic diagram of an aged sludge treatment plant according to an embodiment of the present application;

fig. 2 is a schematic structural diagram of an aged sludge treatment plant according to an embodiment of the present application;

fig. 3 is a cross-sectional view of a jet cavitation device in an aged sludge treatment apparatus according to an embodiment of the present application;

fig. 4 is a schematic diagram of a perforated venturi in an aged sludge treatment plant according to an embodiment of the present disclosure.

The one-to-one correspondence between component names and reference numbers in fig. 1-4 is as follows:

1. a pretreatment device; 11. a crushing device; 12. a stirring device; 2. a rotary cavitation device; 3. a jet cavitation device; 31. a channel; 32. a porous venturi tube; 321. a venturi through hole; 33. a single-bore venturi; 34.a water inlet; 4.a solid-liquid separation device; 41. a conveying device; 5. a sewage treatment system; 51. an air floatation device; 52. a heating device; 53. a first water storage tank; 54. a second water storage tank.

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 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 similarly 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 single numerical value between the endpoints of a range is included in the range. Thus, each point or individual value can form a range not explicitly recited as its own lower or upper limit in combination with any other point or individual value or in combination with other lower or upper limits.

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 a list of embodiments that can be used in various combinations. In each instance, the list is merely a representative group and should not be construed as exhaustive.

The application provides aging oil sludge treatment equipment, which mainly comprises a pretreatment device 1, a rotary cavitation device 2, a jet cavitation device 3 and a solid-liquid separation device 4, as shown in figures 1 and 2.

The pretreatment device 1 is used for pretreating aged oil sludge, the aged oil sludge is firstly sent into the pretreatment device 1, and the pretreatment device 1 can crush the aged oil sludge and uniformly mix the crushed aged oil sludge.

The rotary cavitation device 2 is communicated with the pretreatment device 1, and the sludge treated by the pretreatment device 1 is conveyed to the rotary cavitation device 2. The rotary cavitation device 2 is used for performing rotary cavitation on the aged oil sludge treated by the pretreatment device 1. In detail, the rotating cavitation device 2 includes a vessel and a plurality of hydraulic orifice plates located within the vessel, and the inner wall of the rotating cavitation device 2 includes the inner surface of the vessel and the surface of the hydraulic orifice plates. The container can rotate at a high speed to stir the aged oil sludge at a high speed, and the hydraulic orifice plate can increase the area of the inner wall of the rotary cavitation device 2, so that the aim of hydraulic cavitation is fulfilled. The aged oil sludge is stirred at high speed until bubbles generated in the aged oil sludge are split after approaching the inner wall of a container or the surface of a hydraulic pore plate, and the released energy destroys the combination of oil, sludge and water, so that water particles of the oil sludge are dispersed again.

The jet cavitation device 3 is communicated with the rotary cavitation device 2, and the aged oil sludge stirred by the rotary cavitation device 2 at a high speed is conveyed to the jet cavitation device 3. And the jet cavitation device 3 is used for jet cavitation of the aged oil sludge. In detail, the jet cavitation device 3 comprises a venturi in communication with the reservoir of the rotary cavitation device 2, the venturi being configured for jetting the aged sludge.

The rotary cavitation device 2 and the jet cavitation device 3 carry out double cavitation treatment on the aged oil sludge. The rotary cavitation device 2 is used for fully, uniformly and crushing a sludge-water three-phase mixed medium, so that the aged sludge is subjected to preliminary cavitation and preliminary separation. The jet cavitation device 3 is used for further crushing the mixed medium subjected to the rotary cavitation, so that the oil sludge water particles in a tight combination state are separated, deep cavitation is realized, and further separation is realized. The rotary cavitation device 2 and the jet cavitation device 3 enable oil sludge particles formed by combining oil, water and mud to be fully crushed and dispersed, and effectively improve the separation efficiency of solid phase and liquid phase in the aged oil sludge.

The solid-liquid separation device 4 is communicated with the injection cavitation device 3, the aged oil sludge treated by the injection cavitation device 3 is conveyed to the solid-liquid separation device 4, and the solid-liquid separation device 4 carries out solid-liquid separation on the aged oil sludge.

In one embodiment of the present disclosure, as shown in fig. 1, the pretreatment device 1 includes a crushing device 11 and a stirring device 12. The crushing device 11 is used for crushing the aged sludge. The aged oil sludge is high in viscosity and is in a solid state or a semi-flowing state, and the crushing device 11 can crush the aged oil sludge into smaller particles, so that the stirring device 12 is favorable for uniformly mixing the aged oil sludge subsequently. The crushing device 11 may comprise a crusher or other device.

The stirrer 12 uniformly mixes the aged and crushed sludge with stirring. The stirring device 12 uniformly mixes the aged sludge in a stirring manner, and the stirring device 12 may be a stirrer having a stirring paddle for stirring the sludge and a motor for driving the stirring paddle to rotate. An oil overflow port can be arranged at the top of the stirring device 12, free oil in the aging oil sludge can float on the upper layer by adding water into the stirring device 12, and after the liquid level height reaches the oil overflow port, the floating oil on the upper layer can flow out from the oil overflow port, so that part of oil in the aging oil sludge is removed. The addition of water to the aged oil sludge can also adjust the solid content of the aged oil sludge, which is beneficial for the stirring device 12 to uniformly stir the aged oil sludge.

The outlet of the crusher 11 communicates with the inlet of the agitator 12, and conveys the crushed aged sludge to the agitator 12. The stirrer 12 is communicated with the rotary cavitation device 2, and the aged sludge treated by the stirrer 12 is transferred to the rotary cavitation device 2. The oil spill port of the stirring device 12 may be in communication with an oil storage tank or other container to collect the oil spill.

The transportation of the sludge between the crusher 11 and the agitator 12 and the transportation of the aged sludge between the pretreatment apparatus 1, the rotary cavitation apparatus 2, the jet cavitation apparatus 3, and the solid-liquid separator 4 may be realized by a conveyor, a transportation pipeline, or the like.

In one embodiment of the present disclosure, the water added to the sludge in the stirring device 12 may be hot water, and the temperature of the hot water may be controlled between 75-85 ℃. 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 aged oil sludge can be increased by adding hot water into the aged oil sludge, the fluidity of oil can be increased, and crude oil in a flowing state can be separated more easily. The crude oil in the flow state in the aged oil sludge 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 disclosure, the vessel of the rotary cavitation device 2 is used to agitate the aged sludge, and a plurality of hydraulic orifices may be provided on the inner wall of the vessel. The rotary cavitation device 2 also includes a power means which may be connected to the vessel to drive the vessel to rotate at high speed to agitate the aged sludge in the vessel. The power plant may also be coupled to at least a portion of the hydraulic perforated plate to drive rotation of at least a portion of the hydraulic perforated plate to agitate the aged sludge.

After the aged oil sludge is stirred at a high speed in the container, local instantaneous negative pressure is formed in certain areas of the container, so that a large number of bubbles are generated, and when the bubbles approach the inner wall of the container or the surface of the hydraulic orifice plate to a distance smaller than the initial radius of the bubbles, the speed of the micro jet impacting the inner wall of the container and the surface of the hydraulic orifice plate can reach 1000m/s. The bubbles are further split into smaller bubbles, when the bubbles are split, the micro jet flow is extruded to generate implosion, the energy is released instantly, high-frequency and large-amplitude pressure waves can be emitted, and the pressure can reach 1.01 multiplied by 10 ⁴ KPa to 1.01 × 10 ⁵ KPa, local temperature up to 10 ⁴ C, duration 2 to 3 mus. The high-speed physical breaking effect generated by high-speed stirring of the aged oil sludge by the rotary cavitation device 2 can break a combined membrane of original oil and fine silt particles, destroy the oil-in-water and water-in-oil states and re-disperse oil sludge water particles. The arrangement of the hydraulic orifice plate can increase the surface area of collision with the bubbles, thereby improving the working efficiency of the rotary cavitation device 2.

And the surface water of the bubbles becomes supercritical water under the high-temperature and high-pressure conditions of the aged oil sludge. Supercritical water is water in which the density of water expanded by high temperature and the density of water vapor compressed by high pressure are exactly the same when the pressure and temperature of the water reach a certain value. At this time, the liquid and the gas of water are not distinguished from each other and are completely mixed together, and a new fluid in a high-pressure and high-temperature state is obtained. Supercritical water has an oxidizing effect and is beneficial to dissolving and stripping oil films on the surfaces of particles. The aged oil sludge is subjected to hydration thermal cracking in the rotary cavitation device 2, and the hydration heat refers to heat released by substances during hydration, and can crack macromolecular substances such as asphalt in the aged oil sludge into small molecular substances. Under the high-speed physical crushing action, the supercritical water dissolving action and the hydration heat cracking action of the rotary cavitation device 2, the combination of oil, mud and water can be destroyed, and the three-phase separation is effectively realized. The rotary cavitation adopts a physical method to separate aged oil sludge, no medicament is added in the solid-liquid separation process, and the separation effect is sufficient.

The solid content of the aged oil sludge is more than 35 percent, the proportion of heavy components is more than 20 percent, the median D50 of the particle size of oil sludge particles is less than 20 mu m, and the combination degree of oil, sludge and water is relatively high. Wherein, the heavy component refers to propane in crude oil and a component with molecular mass larger than that of propane; the particle size is used for representing the particle size of the sludge particles, namely the size of the sludge particles; d50 refers to the particle size corresponding to the cumulative percent particle size distribution of a sample at 50%. The rotary cavitation device 2 controls the generation amount of bubbles to enable the volume proportion of the bubbles in the aged oil sludge to be between 50 and 70 percent, and can strip oil films on the surfaces of oil sludge particles.

In one embodiment of the present disclosure, as shown in fig. 1 and 2, the jet cavitation device 3 is communicated with the rotary cavitation device 2 and the solid-liquid separation device 4, and the aged sludge after the rotary cavitation enters the jet cavitation device 3, is subjected to jet cavitation by the venturi tube, and is then conveyed from the venturi tube to the solid-liquid separation device 4.

The venturi tube comprises a convergent section, a throat section and a divergent section which are communicated in sequence, and normally, fluid enters the throat section from the convergent section and then enters the divergent section to be ejected. The contraction section and the diffusion section are both conical pipes, the taper of the diffusion section is smaller than that of the contraction section, and the diffusion section can enable the fluid to be relatively slowly and gradually decelerated, so that the turbulence degree of the fluid is reduced, and the energy loss is reduced. The specific structure and principles of the venturi are well known in the art. The aged oil sludge is instantaneously depressurized and accelerated when being sprayed out of the Venturi tube, and strong shock waves are generated, so that water in the oil-containing sludge is instantaneously gasified and broken, the binding force between hydrocarbon (oil) and solids is broken, and the oil is extracted from silt.

In one embodiment of the present disclosure, as shown in fig. 3, the jetting cavitation device 3 includes a porous venturi tube 32 and a single-hole venturi tube 33 that communicate with each other, the porous venturi tube 32 communicates with the rotational cavitation device 2, and the single-hole venturi tube 33 communicates with the solid-liquid separation device 4. In jet cavitation, the aged sludge first enters the perforated venturi 32 and is injected, and then enters the single-orifice venturi 33 for re-injection. In the jet cavitation, the aged sludge subjected to the rotary cavitation is jetted through the porous venturi tube 32, and further cavitation is performed to break the structure of sludge water particles. The single-hole venturi tube 33 can homogenize and decelerate the aged oil sludge subjected to jet cavitation of the multi-hole venturi tube 32.

Specifically, as shown in fig. 3, 4, the cavitation device 3 includes a passage 31, and a multi-orifice venturi tube 32 and a single-orifice venturi tube 33 are provided in the passage 31. A plurality of venturi through holes 321 for aged oil sludge to pass through are distributed on the porous venturi tube 32, and the extending directions of the plurality of venturi through holes 321 are consistent. Each venturi through-hole 321 includes a throat section, a converging section, and a diverging section, the taper of the converging section being less than the taper of the diverging section. The aged sludge after the rotating cavitation is conveyed to the jetting cavitation device 3, enters the multihole venturi tube 32, and is jetted from the plurality of venturi through holes 321. The single-bore venturi 33 also includes a throat section, a converging section, and a diverging section, the converging section having a taper less than the taper of the diverging section. The aged oil sludge sprayed out of the venturi through hole 321 can enter the single-hole venturi tube 33 along the passage 31, be sprayed out through the single-hole venturi tube 33, and then be conveyed into the solid-liquid separation device 4.

The venturi can be used upright or inverted. When the venturi tube is used in an upright mode, fluid enters the throat tube section from the contraction section of the venturi tube and then is sprayed out from the diffusion section, and when the venturi tube is used in an inverted mode, fluid enters the throat tube section from the diffusion section of the venturi tube and then is sprayed out from the contraction section.

In one embodiment of the present disclosure, the venturi through-hole 321 of the multi-hole venturi tube 32 and the single-hole venturi tube 33 are both disposed in the passage 31 in a positive manner. The diffusion section of the Venturi through hole 321 is opposite to the contraction section of the single-hole Venturi tube 33, aged oil sludge enters from the contraction section of the Venturi through hole 321 and is sprayed out from the diffusion section, and then enters from the contraction section of the single-hole Venturi tube 33 and is sprayed out from the diffusion section.

In another embodiment of the present disclosure, as shown in fig. 3, 4, the venturi through hole 321 of the porous venturi tube 32 is disposed in the passage 31 in an inverted manner, and the single-hole venturi tube 33 is disposed in the passage 31 in an upright manner. The contraction section of the Venturi through hole 321 is opposite to the contraction section of the single-hole Venturi tube 33, aged oil sludge enters from the diffusion section of the Venturi through hole 321 and is sprayed out from the contraction section, and then enters from the contraction section of the single-hole Venturi tube 33 and is sprayed out from the diffusion section. The venturi through hole 321 is inversely arranged, so that the speed of the aged oil sludge is high and the pressure of the aged oil sludge is low when the aged oil sludge is sprayed out, and the pressure of the aged oil sludge entering the contraction section of the single-hole venturi tube 33 is changed violently, thereby being beneficial to improving the cavitation effect and fully crushing and dispersing aged oil sludge particles.

The multi-hole venturi tube 32 and the single-hole venturi tube 33 of the injection cavitation device 3 perform two-time injection on the aged oil sludge so as to fully disperse the aged oil sludge, which is beneficial to fully generating bubbles, and impact is generated on the aged oil sludge when the bubbles collapse, so that oil sludge particles formed by combining oil, mud and water are further crushed and dispersed.

The jet cavitation device 3 can send water into the aged oil sludge to dilute the aged oil sludge, so that particles of the aged oil sludge can be dispersed in water, the pressure of the aged oil sludge can be increased, and the jet cavitation device is favorable for more sufficient crushing and dispersion of the aged oil sludge during jet cavitation. Specifically, as shown in fig. 3, a water inlet 34 may be provided on the channel 31 of the jet cavitation device 3, and water is supplied to the aged sludge in the jet cavitation device 3 through the water inlet 34. The water inlet 34 can be arranged between the jet cavitation device 3 and the rotary cavitation device 2 and is used for supplying water to the aged oil sludge before jet cavitation; alternatively, the water inlet 34 may be located between the single-bore venturi 33 and the multi-bore venturi 32 to supply water to the aged sludge during jet cavitation in order to adjust the operating pressure of the medium in the venturi.

In one embodiment of the present disclosure, as shown in fig. 3, the channel 31 of the jet cavitation device 3 is a three-way pipe having a port a, a port B and a port C, wherein a multi-hole venturi tube 32 is disposed in the port a, a single-hole venturi tube 33 is disposed in the port B, and the port C is used as the water inlet 34. A. The ports B and C are constructed into a T-shaped structure, the port A provided with the porous Venturi tube 32 and the port B provided with the single-hole Venturi tube 33 are arranged on the same straight line to extend, so that the obstruction to aging oil sludge is reduced, and the kinetic energy loss of the aging oil sludge is reduced.

In one embodiment of the present disclosure, the solid-liquid separator 4 separates the aged sludge subjected to jet cavitation into a solid phase and a liquid phase, and then detects the separated solid phase. The solid phase qualification standard is that the oil content is not more than 0.3 percent. The qualified solid phase can reach the required indexes of agricultural soil, and can be directly discharged or further processed and utilized, such as brick firing, paving and the like. The solid phase which is separated by the solid-liquid separation device 4 and does not reach the qualified standard can be conveyed back to the pretreatment device 1 for pretreatment again, and then is conveyed from the pretreatment device 1 to the rotary cavitation device 2, the jet cavitation device 3 and the solid-liquid separation device 4 for treatment in sequence. The unqualified solid phase can be repeatedly processed for several times until the solid phase separated by the solid-liquid separation device 4 reaches the qualified standard.

Specifically, the solid-liquid separation device 4 may be a horizontal spiral centrifuge, and separates a solid phase from a liquid phase by centrifugation. Specifically, the unqualified solid phase separated by the horizontal screw centrifuge can be conveyed to the stirring device 12 of the pretreatment device 1 by the conveying device 41, and the conveying device 41 can be a screw conveyor. The part of unqualified solid phase can be mixed with new aged oil sludge to be treated, or can independently enter the pretreatment device 1 to carry out the processes of pretreatment, rotary cavitation, jet cavitation and solid-liquid separation again until reaching the qualified standard. The solid-liquid separator 4 may be any other type of device, such as a butterfly centrifuge, as long as it can separate the aged sludge into a solid phase and a liquid phase. Specifically, the solid-liquid separator 4 and the stirring device 12 in the pretreatment device 1 may communicate with each other via the conveyor 41, and the unqualified solid phase may be conveyed to the stirring device 12 via the conveyor 41. The conveying device 41 is not limited to the use of a screw conveyor, a belt conveyor, or the like.

In an embodiment of the present disclosure, the solid-liquid separation device 4 may adopt a three-phase horizontal spiral centrifuge, and can perform three-phase separation on aged oil sludge with high oil content through centrifugation to separate oil, water, and a solid phase. In another embodiment, when the oil content of the aged sludge is relatively low, a two-phase horizontal spiral centrifuge may also be used to separate the sludge into solid and liquid phases.

In one embodiment of the present disclosure, as shown in fig. 2 and 3, the aged sludge treatment facility further includes a sewage treatment system 5, the sewage treatment system 5 is communicated with the solid-liquid separation device 4, and the liquid phase separated by the solid-liquid separation device 4 is conveyed to the sewage treatment system 5. The sewage treatment system 5 is used for performing oil-water separation on the liquid phase separated by the solid-liquid separation device 4 to separate oil and water. When the solid-liquid separation device 4 is a three-phase horizontal spiral centrifuge, the three-phase horizontal spiral centrifuge conveys the separated water to a sewage treatment system for further oil-water separation treatment. Specifically, the sewage treatment system 5 includes an air flotation device 51, and the air flotation device 51 is communicated with the horizontal spiral centrifuge to further separate oil and water from the liquid phase separated by the horizontal spiral centrifuge.

In one embodiment of the present disclosure, the sewage treatment system 5 may be further communicated with the pretreatment apparatus 1, and the separated water may be transported to the pretreatment apparatus 1, and the solid content of the aged sludge in the pretreatment apparatus 1 may be adjusted and recycled. The sewage treatment system 5 may provide power to the liquid by a power device such as a vane pump. Specifically, the air flotation device 51 is communicated with the stirring device of the pretreatment device 1.

In one embodiment of the present disclosure, the wastewater treatment system 5 may be further in communication with the rotary cavitation device 2 to adjust the solids-liquid content of the aged sludge in the rotary cavitation device 2. Specifically, the sewage treatment system 5 is communicated with the container of the rotary cavitation apparatus 2, and the water separated by the air flotation apparatus 51 is added into the container of the rotary cavitation apparatus 2.

In one embodiment of the present disclosure, the sewage treatment system 5 may further communicate with the jet cavitation device 3, and the separated water is transported to the jet cavitation device 3. Specifically, the sewage treatment system 5 is communicated with the water inlet 34 of the jet cavitation device 3, and the water separated by the air flotation device 51 is added into a venturi tube to adjust the pressure.

In an embodiment of the present disclosure, the sewage treatment system 5 further includes a heating device 52, the heating device 52 is connected between the air flotation device 51 and the pretreatment device 1, and is capable of heating the water separated by the air flotation device 51 before being conveyed to the pretreatment device 1, and heating the water to a temperature of 75-85 ℃, so as to improve the fluidity of the crude oil, and facilitate the separation of the crude oil. Preferably, the heating device 52 can heat the water to 80 degrees. Not only can ensure that the crude oil has better fluidity, but also can ensure lower energy consumption.

In one embodiment of the present disclosure, as shown in fig. 2, the sewage treatment system 5 further comprises a first water storage tank 53 and a second water storage tank 54, the first water storage tank 53 is connected between the solid-liquid separation device 4 and the air flotation device 51, the liquid phase separated by the solid-liquid separation device 4 can be temporarily stored in the first water storage tank 53, and the second water storage tank 54 is connected between the heating device 52 and the pretreatment device 1, and can temporarily store the circulating hot water before entering the pretreatment device 1. The second water tank 54 is also connected to the spray cavitation device 3 to supply water to the spray cavitation device 3.

The aging oil sludge treatment equipment treats the aging oil sludge in a physical mode, no chemical is needed to be added, the cost is low, the oil content of the separated solid phase is less than or equal to 0.3 percent, and the requirement index of agricultural soil is met. The pretreatment device 1, the rotary cavitation device 2, the jet cavitation device 3, the solid-liquid separation device 4 and the sewage treatment system 5 can form a closed treatment system, no secondary pollution is caused, no other harmful gas is discharged, and the sewage treatment system 5 realizes the recycling of water, and is safe and environment-friendly. In addition, the whole treatment process of the aging oil sludge treatment can be completed at normal temperature or slightly higher than normal temperature, the energy consumption is low, the step of adding hot water is provided in the pretreatment process, the frozen aging oil sludge can be treated, and the problem that the aging oil sludge cannot be treated in winter at present is solved.

The aged sludge treatment facility may further include a control unit, and the pretreatment apparatus 1, the rotary cavitation apparatus 2, the solid-liquid separation apparatus 4, the sewage treatment system 5, and the like may be controlled by the control unit. The control unit can include PCL, can remote control start-stop, also can operate on the spot, and is safe convenient. Specifically, the control unit may control the motor of the stirring device 12 in the pretreatment device 1 to operate, so as to stir the aged sludge. The control unit can control the power device of the rotary cavitation device 2 to work so that the container can stir the aged oil sludge at a high speed. The control unit can control the horizontal spiral centrifuge to work so as to separate solid phase and liquid phase of the aged oil sludge, and control the conveying device 41 to convey unqualified solid phase to the pretreatment device. The control unit may also control the power plant of the sewage treatment system 5, being able to pump water into the pre-treatment device 1 or into the jet cavitation device 3.

All devices of the aged oil sludge treatment equipment can be in skid-mounted mobile design, and a pretreatment device 1, a rotary cavitation device 2, a jet cavitation device 3, a solid-liquid separation device 4, a sewage treatment system 5 and the like of the aged oil sludge treatment equipment 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 on-site aged oil sludge, so that the occupied area is reduced, the source treatment can be realized, and the transportation cost and the influence on the environment are reduced.

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. An aged sludge treatment plant, comprising:

a pretreatment device (1), wherein the pretreatment device (1) comprises a crushing device (11) for crushing aged oil sludge and a stirring device (12) for uniformly mixing the crushed aged oil sludge;

the rotary cavitation device (2) is communicated with the pretreatment device (1) and is used for stirring the uniformly mixed aged oil sludge at a high speed so that bubbles generated in the aged oil sludge are split after approaching the inner wall of the rotary cavitation device (2), and the released energy breaks the combination of oil, mud and water so as to re-disperse oil sludge water particles;

an injection cavitation device (3), the injection cavitation device (3) comprising a venturi in communication with the rotary cavitation device (2), the venturi configured for injecting aged sludge;

and the solid-liquid separation device (4) is communicated with the jet cavitation device (3) and is used for separating the aged oil sludge treated by the jet cavitation device (3) into a solid phase and a liquid phase.

2. An aged sludge treatment plant according to claim 1, wherein the agitation means (12) is adapted to add water to the landed sludge so that the solids phase of the landed sludge is 15-30% of the total volume of the sludge.

3. The aged sludge treatment plant according to claim 2, wherein the stirring device (12) is provided with an oil overflow configured to overflow oil floes floating on the upper layer after adding water to the aged sludge.

4. The aged sludge treatment plant according to claim 1, wherein the jet cavitation device (3) comprises:

a channel (31);

a perforated venturi tube (32), said perforated venturi tube (32) being arranged in said channel (31) and comprising a plurality of venturi through holes (321);

a single-bore venturi (33), the single-bore venturi (33) being disposed in the passage (31);

the aged sludge is configured to be ejected through the plurality of venturi through-holes (321) of the porous venturi tube (32) and into the single-orifice venturi tube (33) for re-ejection.

5. The aged sludge treatment plant according to claim 4, wherein the aged sludge entering the jet cavitation device (3) is configured to: the air is ejected from the diffusion section and the contraction section of the plurality of Venturi through holes (321); and the gas enters from the contraction section of the single-hole Venturi tube (33) and is sprayed out from the diffusion section.

6. The aged sludge treatment facility according to claim 1, wherein the solid-liquid separation device (4) is communicated with the stirring device (12), and the solid phase which is separated by the solid-liquid separation device (4) and does not meet the qualification standards is conveyed to the stirring device (12).

7. The aged sludge treatment plant according to claim 1, further comprising a sewage treatment system (5), wherein the sewage treatment system (5) is communicated with the solid-liquid separation device (4) and is used for performing oil-water separation on the liquid phase separated by the solid-liquid separation device (4).

8. An aged sludge treatment plant according to claim 7, wherein the sewage treatment system (5) is in communication with the pre-treatment unit (1) and the water separated therefrom is transported to the stirring unit (12).

9. The aged sludge treatment plant according to claim 7, wherein the sewage treatment system (5) comprises a heating device (52) for heating water separated by the sewage treatment system (5).

10. The aged sludge treatment plant according to any one of claims 1 to 9, wherein the rotary cavitation device (2) is configured to: the air bubble volume ratio in the aged oil sludge is between 50 and 70 percent.

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