Oily sludge dewatering and deoiling device

Abstract

The invention relates to an oily sludge dewatering and deoiling device which comprises a cabinet body, a freezing tank, a heating tank, a refrigerator for cooling the freezing tank and a heating device for heating the heating tank are arranged in the cabinet body, and the freezing tank and the heating tank are tank bodies which are provided with openings in the bottoms and are fixedly arranged in the cabinet body. Negative pressure connecting ports and exhaust ports are formed in tank bodies of the freezing tank and the heating tank, a lifting turntable assembly located below the freezing tank and the heating tank is further arranged in the cabinet body, the lifting turntable assembly comprises a turntable, two lifting frames are arranged on the surface of the turntable, and sealing covers matched with openings in the bottoms of the freezing tank and the heating tank are arranged at the tops of the lifting frames. The oil-containing sludge dewatering and deoiling device disclosed by the invention is high in integration level, efficient, energy-saving and small in secondary pollution risk.

Description

TECHNICAL FIELD

[0001] The present application relates to a waste treatment device, in particular to a dewatering and oil removal device for oily sludge. BACKGROUND

[0002] Oily sludge is a typical hazardous waste generated in the petrochemical, oil refining, storage and transportation, and mechanical processing industries. It has complex composition and often forms a stable oil-in-water or water-in-oil emulsion structure inside, resulting in high viscosity and making it extremely difficult to separate oil, water, and solids.

[0003] Currently, common treatment technologies for oily sludge include mechanical dewatering, pressure filtration dewatering, and thermal cracking. However, these methods have certain limitations. Mechanical dewatering and pressure filtration dewatering are widely used, but they cannot effectively destroy the highly emulsified sludge structure, resulting in low dewatering and oil removal efficiency. Additionally, the core components of related equipment, such as filter cloth for pressure filters, are expensive and require frequent maintenance, which affects their stability. Although thermal cracking technology can achieve complete decomposition of organic matter, it has high energy consumption and operating costs, especially when dealing with high-water-content sludge, as the energy utilization rate is low. Moreover, high-temperature processes can cause oil to degrade and release toxic and harmful volatile organic compounds, posing a risk of secondary pollution.

[0004] Freezing-thawing technology, as a pretreatment method, has been proven to effectively destroy the colloidal and emulsion structure in sludge. The extrusion effect caused by ice crystal growth promotes oil-water separation. However, existing freezing treatment equipment is usually an independent processing unit, and subsequent separation of oil, water, and solids still requires the combination of other process equipment. This results in a long process flow, low equipment integration, and high overall energy consumption and land area. SUMMARY

[0005] To solve the technical problems of process flow dispersion, high energy consumption, high risk of secondary pollution, and low equipment integration in the prior art, the present application provides a high-integration, energy-efficient, and low-risk oily sludge dewatering and oil removal device.

[0006] The oily sludge dewatering and oil removal device of the present application comprises a cabinet, a freezing tank, a heating tank, a refrigeration device for cooling the freezing tank, and a heating device for heating the heating tank. The freezing tank and the heating tank are both tank bodies with openings at the bottom and are fixedly arranged in the cabinet. The tank bodies of the freezing tank and the heating tank are both provided with a negative pressure connection port and an exhaust port. The cabinet is also provided with a lifting turntable assembly located below the freezing tank and the heating tank. The lifting turntable assembly comprises a turntable, and the surface of the turntable is provided with two lifting frames. The top of each lifting frame is provided with a sealing cover adapted to the opening at the bottom of the freezing tank and the heating tank.

[0007] The oil-containing sludge dewatering and oil removal device has the advantages that the freezing tank for freezing demulsification and the heating tank for vacuum low-temperature evaporation are innovatively integrated in the same cabinet, which greatly improves the integration degree of the device and reduces the overall floor area of the device.

[0008] Further, the oil-containing sludge dewatering and oil removal device has the advantages that the freezing tank and the heating tank are both double-layer tanks including an outer tank body and an inner tank body, the inner tank body is fixedly arranged in the outer tank body, and the outer tank body is fixed in the cabinet.

[0009] The double-layer tank body improves the heat insulation of the freezing tank and the heating tank, avoids mutual influence between the freezing tank and the heating tank, and facilitates installation and arrangement of related pipelines.

[0010] Further, the oil-containing sludge dewatering and oil removal device further comprises a condensing assembly including a condenser and a condensate buffer tank, the condenser includes a condensing tank and a coil pipe in the condensing tank, a gas inlet of the condenser is communicated with an exhaust port of the heating tank through a pipeline, and a liquid outlet of the condenser is connected with the condensate buffer tank through a pipeline.

[0011] The condenser is arranged to condense oil-containing steam discharged from the heating tank, and the condensate buffer tank is arranged to temporarily store the oil-containing condensate formed after condensation, thereby facilitating treatment of oil-water mixed liquid by a subsequent oil-water separation device.

[0012] Further, the oil-containing sludge dewatering and oil removal device has the advantages that the gas inlet of the condenser is also communicated with an exhaust port of the freezing tank through a pipeline.

[0013] Since a small amount of steam is generated in the freezing tank during freezing of the sludge, the freezing tank is connected with the condenser to collect and condense the small amount of steam in the freezing tank.

[0014] Further, the oil-containing sludge dewatering and oil removal device has the advantages that the number of the condensers is two, the two condensers are connected in series through pipelines, and the liquid outlets of the two condensers are both connected with the condensate buffer tank through pipelines.

[0015] The two condensers directly connected with the freezing tank or the heating tank can realize preliminary condensation of the steam, and the other condenser can realize deep condensation of the steam containing low-boiling organic matter, thereby improving the condensation effect.

[0016] In specific work, the steam transmitted from the freezing tank or the heating tank can be transmitted to the two condensers in sequence through pipelines, and the steam transmitted into the condensers is condensed into liquid oil or water after passing through the internal condensing coils, and the oil or water condensed is transmitted to the condensate buffer tank below through the pipelines at the bottom of the condensers under the action of gravity for temporary storage.

[0017] Further, the oil-containing sludge dewatering and oil removing device also comprises an air extraction device, which comprises a vacuum pump and a vacuum buffer tank, the gas outlet of the vacuum buffer tank is connected with the vacuum pump through a pipeline, and the gas inlet of the vacuum buffer tank is communicated with the exhaust outlets of the freezing tank, the heating tank and the condenser through a three-way pipe and pipelines.

[0018] The vacuum pump is arranged to realize the air extraction function of the freezing tank and the heating tank, thereby reducing the internal gas pressure and the boiling point of the tank body, and further reducing the energy consumption. Meanwhile, the vacuum pump is connected with the exhaust outlet of the cold energy device through a pipeline, so that the steam output from the heating tank or the condensing tank can quickly enter the condenser for condensation, thereby improving the condensation efficiency. The vacuum buffer tank is arranged to avoid the direct entry of the extracted organic matter and water into the vacuum pump during the vacuum extraction process, thereby preventing the corrosion of the vacuum pump, and the vacuum buffer tank can control the vacuum degree of the system during the vacuum extraction.

[0019] Further, the oil-containing sludge dewatering and oil removing device also comprises an oil-water separation device, which comprises an oil-water separator, a water storage tank and an oil storage tank, the input port of the oil-water separator is connected with the liquid output port of the condensate buffer tank through a pipeline, the water outlet of the oil-water separator is communicated with the water storage tank through a pipeline, and the oil outlet of the oil-water separator is communicated with the oil storage tank through a pipeline.

[0020] The oil-water separation device is arranged to realize the efficient separation of oil and water, and the oil-water separator can be a gravity sedimentation type oil-water separator.

[0021] Further, the oil-containing sludge dewatering and oil removing device also comprises a sludge tank, and the sludge output port of the sludge tank is connected with the sludge inlet of the freezing tank through a pipeline.

[0022] The sludge tank is arranged to realize the automatic feeding of the oil-containing sludge to the freezing tank, thereby improving the processing efficiency of the oil-containing sludge.

[0023] Further, the oil-containing sludge dewatering and oil removing device, the refrigerant of the refrigerating device is any one of sodium chloride solution, calcium chloride solution and water-glycol solution.

[0024] The phase change material such as sodium chloride solution, calcium chloride solution or water-glycol solution is used as the refrigerant of the refrigerator, so that the refrigeration efficiency is greatly improved and the energy consumption of the equipment is reduced.

[0025] Further, the oil-containing sludge dewatering and oil removing device has an electric rotary table and an electric lifting frame.

[0026] The electric rotary table and the electric lifting frame improve the automation level of the equipment, so that the treatment efficiency of the oil-containing sludge is further improved.

[0027] The above description is only a summary of the technical scheme of the present application, in order to more clearly understand the technical means of the present application, and to be implemented in accordance with the content of the specification, the following will be described in detail by the examples of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is the front view of the cabinet body.

[0029] Figure 2 is the internal structure diagram of the cabinet body.

[0030] Figure 3 is the planar arrangement diagram of the refrigeration tank and the heating tank.

[0031] Figure 4 is the structure diagram of the oil-containing sludge dewatering and oil removing device.

[0032] Figure 5 is Figure 4 the local enlarged view of A part in the figure.

[0033] Figure 6 is Figure 4 the local enlarged view of B part in the figure.

[0034] Figure 7 is the structure diagram of the refrigeration tank.

[0035] Figure 8 is the structure diagram of the heating tank.

[0036] Figure 9 is the structure diagram of the lifting and disc assembling component.

[0037] Figure 10 is the structure diagram of the condenser.

[0038] In the figure, cabinet 1, freezing tank 2, heating tank 3, refrigerator 4, heating device 5, negative pressure connection port 6, exhaust port 7, rotating disc 8, lifting frame 9, sealing cover 10, shell 11, box 12, circulating fan 13, vacuum pump 14, vacuum buffer tank 15, sewage inlet 16, sludge tank 17, temperature sensor 18, outer tank body 19, inner tank body 20, condenser 21, condensate buffer tank 22, condensing tank 23, coil 24, oil-water separator 25, water storage tank 26, oil storage tank 27, water outlet 28, oil outlet 29. DETAILED DESCRIPTION

[0039] The specific embodiments of the present application will be further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present application, but are not used to limit the scope of the present application.

[0040] Example 1: Referring to Figures 1 to 10 The oil-containing sludge dewatering and oil removal device of the present embodiment comprises a cabinet 1, and a freezing tank 2, a heating tank 3, a refrigerator 4 for cooling the freezing tank, and a heating device 5 for heating the heating tank are arranged in the cabinet. The freezing tank and the heating tank are both tank bodies with an open bottom and are fixedly arranged in the cabinet. The tank bodies of the freezing tank and the heating tank are both provided with a negative pressure connection port 6 and an exhaust port 7. A lifting rotating disc assembly is also arranged in the cabinet below the freezing tank and the heating tank. The lifting rotating disc assembly comprises a rotating disc 8, and the surface of the rotating disc is provided with two lifting frames 9. The top of each lifting frame is provided with a sealing cover 10 which is adapted to the opening of the bottom of the freezing tank and the heating tank.

[0041] The oil-containing sludge dewatering and oil removal device has the advantages that the freezing tank for freezing demulsification and the heating tank for vacuum low-temperature evaporation are innovatively integrated in the same cabinet, which greatly improves the integration of the equipment and reduces the overall floor area of the equipment. The arrangement of the lifting rotating disc assembly realizes the rapid transfer of materials between the freezing tank and the heating tank, thereby realizing efficient treatment of the sludge. The front freezing tank realizes demulsification treatment of the emulsified structure in the oil-containing sludge. At the same time, the freezing tank and the heating tank can be connected to a negative pressure gas source through the negative pressure connection port, so that the inside of the tank can maintain a certain vacuum degree. This allows the subsequent heating tank to realize the heating and evaporation of the sludge without a high-temperature environment, thereby reducing the overall energy consumption of the equipment and effectively inhibiting the generation of harmful volatile gases, thereby reducing the risk of secondary pollution of the surrounding environment.

[0042] The freezing tank is used to freeze the sludge to crystallize the water in the sludge, and the ice crystals grow to squeeze and destroy the emulsification and colloid structure between oil, water and solid, thereby realizing the preliminary separation of oil, water and solid.

[0043] The refrigeration device is used to cool the freezing tank, so that the inner cavity of the freezing tank can be maintained at-25℃ to-15℃, thereby realizing the freezing treatment of the sludge. The refrigeration device can be a conventional small refrigeration system equipped with a compressor, and the output copper pipe can be arranged on the outer wall of the tank body or in the interlayer of the double-layer tank body, so as to realize rapid cooling of the freezing tank.

[0044] In order to further realize energy saving, the refrigeration device can use a phase change material as a refrigerant, such as a sodium chloride solution, a calcium chloride solution or a water-glycol solution. The temperature stability of the phase change material can improve the efficiency of the refrigeration device and reduce the energy consumption of the equipment. In specific work, the refrigeration device compresses the refrigerant through the built-in compressor, and the compressed refrigerant is transmitted to the freezing tank through the pipeline and vaporizes to absorb heat, thereby cooling the freezing tank. In order to realize energy saving, the refrigeration device can intermittently refrigerate, and the refrigeration device can use the latent heat characteristics of the phase change material to continuously insulate the freezing tank during the non-refrigeration period, thereby reducing the energy consumption of the equipment.

[0045] The heating tank is used to heat the sludge, so that the oil and water in the sludge can be quickly evaporated and transmitted to the subsequent treatment equipment through the exhaust port for further treatment.

[0046] The heating device is used to realize the heating function of the heating tank, so that the temperature in the inner cavity of the heating tank can be maintained at 65℃ to 85℃, thereby realizing the azeotropic evaporation of the oil and water. The heating device can be a resistance wire heater. Specifically, the shell 11 with built-in heating resistance wire is fixed on the box 12 by bolts, one end of the shell is connected to the circulating fan 13 through the pipeline, the other end is connected to the heating port of the heating tank through the pipeline, and the air outlet of the heating tank is connected to the other end of the circulating fan through the pipeline. In work, the air output by the circulating fan is transmitted to the shell through the pipeline, and then heated by the heating resistance wire in the shell. The heated hot air is transmitted to the heating cavity of the heating tank, such as the interlayer of the double-layer tank body, through the pipeline and the heating port, and then transmitted to the circulating fan through the air outlet on the tank body, thereby forming a circulating heating of the heating tank. Similar to the refrigeration device, the heating device can also work intermittently to realize energy saving.

[0047] In this embodiment, the refrigeration device and the heating device are respectively fixed and installed on the inner wall of the cabinet body through the box 12.

[0048] Preferably, the freezing tank and the heating tank are both double-layer tank bodies, so as to isolate the mutual influence between the heating tank and the freezing tank, improve the heat preservation or heating performance, and facilitate the installation of the related pipelines.

[0049] The negative pressure connection port on the freezing tank and the heating tank is used for connecting a negative pressure gas source. In the embodiment, the negative pressure gas source is generated by a vacuum pump 14 and a vacuum buffer tank 15. The negative pressure connection port is arranged to enable the inner cavity of the freezing tank and the heating tank to maintain a vacuum degree of-0.08 MPa to-0.05 MPa, preferably 0.06 MP, under the action of the vacuum pump, so that the oil-water mixture can be boiled and evaporated at a temperature of 65 DEG C to 85 DEG C, thereby reducing energy consumption and preventing the generation of toxic and harmful gas at high temperature to cause secondary pollution to the surrounding environment.

[0050] The exhaust port on the freezing tank and the heating tank is used for exhausting gas, so that the oil-water mixed steam in the tank body is transmitted to a downstream condenser and an oil-water separation device through the exhaust port and a pipeline, to realize oil-water separation.

[0051] The lifting turntable assembly is used to transfer the sludge in the freezing tank to the heating tank, so that the heating device heats the sludge to evaporate the oil-water in the form of gas, and then performs subsequent oil-water separation treatment.

[0052] The lifting frame is used to lower the sludge in the freezing tank from the inner cavity of the freezing tank, or to lift the frozen sludge into the inner cavity of the heating tank. The turntable is used to change the position of the lifting frame and the sludge thereon, so that the sludge can be aligned with the corresponding tank body, and in addition, the processed solid residues can be rotated to a discharge position to unload the solid residues.

[0053] The lifting frame and the turntable can be manual or electric. In order to realize automatic processing, the lifting frame is preferably an electric lifting frame, and the turntable is preferably an electric turntable.

[0054] In the embodiment, the body of the electric turntable is fixed to the bottom wall of the cabinet body, and two electric lifting frames are arranged on the left and right sides of the turntable. The top of the lifting frame has a sealing cover matched with the bottom opening of the freezing tank and the heating tank, and the sealing cover is fixed to the lifting frame. When loading, the oil-containing sludge can be directly loaded on the sealing cover. In addition, in order to facilitate loading and realize automatic loading, the top of the freezing tank is provided with a sludge inlet 16, which is in communication with the inner cavity of the freezing tank. The output port of a sludge tank 17 is connected to the sludge inlet through a pipeline. A motor-driven stirring paddle is arranged in the sludge tank to stir the oil-containing sludge. The stirred sludge can be quickly input into the inner layer tank body of the freezing tank through the pipeline under the action of gravity or external pressure, to perform pre-freezing treatment.

[0055] In order to realize the accurate control of temperature, the temperature sensor 18 can be arranged on the freezing tank and the heating tank. In the embodiment, the temperature sensor is installed in the interlayer of the outer tank body and the inner tank body. The temperature sensor is connected with the controller in the cabinet body, such as the PLC controller, through the wire. The PLC controller can control the start and stop of the refrigerator and the heating device according to the temperature data transmitted by the temperature sensor, so as to realize the feedback control of temperature, and then the freezing tank and the heating tank can be maintained at the predetermined temperature, and the efficient use of energy can be realized, and the waste of energy can be prevented. The specific connection structure and control method between the PLC and the temperature sensor, the refrigerator, the heating device and other components are conventional technologies in the field, which will not be described here.

[0056] The specific working process of the oil-containing sludge dewatering and oil removal device is as follows.

[0057] The sludge is first input into the sludge tank and stirred by the stirring paddle in the sludge tank. The uniformly stirred sludge is input into the inner cavity of the freezing tank through the pipeline, and then the valve connecting the sludge tank and the freezing tank is closed. The freezing tank maintains the temperature between-25℃ and-15℃ under the cooling effect of the refrigerator and performs the predetermined time freezing process on the sludge therein. A small amount of steam formed during the freezing process can be transmitted to the condenser through the exhaust port on the tank body for next step processing. After the freezing is completed, the elevator drives the sealing cover at the top thereof and the frozen sludge on the surface of the sealing cover to be lowered to a predetermined height, and then the rotating disc drives the frozen sludge to rotate to the position directly below the heating tank. When the sealing cover and the frozen sludge thereon are aligned with the opening at the bottom of the heating tank, the lifting frame drives the sealing cover and the frozen sludge to rise again until the frozen sludge completely enters the heating tank, and the sealing cover covers and completely seals the opening at the bottom of the tank body. At the same time, the lifting frame and the sealing cover on the other side also seal the freezing tank in the same way, so that the sludge can continue to be fed into the freezing tank.

[0058] The frozen sludge fed into the heating tank is heated to a predetermined temperature under the continuous heating of the heating device, and then the oil and water in the sludge reach the boiling point and form a large amount of steam. Before or during the heating process, the vacuum pump can perform vacuumization on the tank body through the negative pressure connection port, and then the valve connecting the tank body and the negative pressure source is closed, so that a certain negative pressure can be maintained in the tank body, and then the boiling point of the oil-water mixture is reduced.

[0059] The evaporated oil-water mixture steam can be transmitted to the condenser and the oil-water separation device through the exhaust port and the pipeline in sequence, so as to realize the oil-water separation.

[0060] As can be seen from the above description, compared with the existing device, the oil-containing sludge dewatering and oil removal device innovatively integrates the freezing demulsification and the vacuum low-temperature evaporation in one set of equipment, realizes the automatic transfer of the material through the lifting and rotating disc assembly, has a compact process flow, realizes the continuous or semi-continuous treatment, and reduces the occupied area and the operation links.

[0061] The freezing tank uses ice crystal growth physical force to completely destroy the stable emulsification structure through freezing treatment, thereby creating favorable conditions for subsequent vacuum low-temperature evaporation. This physical demulsification method does not add chemical agents, thereby creating favorable mass transfer conditions for the subsequent separation step and overcoming the shortcomings of incomplete traditional mechanical or chemical demulsification and secondary pollution.

[0062] The heating tank is combined with a vacuum environment and low-temperature heating, thereby greatly reducing the boiling point of oil and water, so that they can be co-boiled and evaporated at 65-85°C. This effectively avoids oil cracking and coking degradation caused by traditional high-temperature treatment, thereby ensuring the quality of the recovered oil. On the other hand, the oil and water are simultaneously removed in the form of steam and condensed and recovered, thereby realizing deep and complete separation of the oil, water, and solid three phases and significantly reducing the water content and oil content of the final solid residue.

[0063] Moreover, the freezing pretreatment improves the efficiency of subsequent evaporation and reduces the temperature and energy consumption required for evaporation. The refrigerator can use the built-in phase change material, and the heating device can use the hot air circulation system to stabilize temperature fluctuations, reduce the start-stop frequency of the main equipment, and further reduce the energy consumption of the system.

[0064] In summary, the oil-containing sludge dewatering and oil removal device performs the entire sludge treatment process in a closed manner, and the low-temperature vacuum process inhibits the generation of harmful volatile organic compounds from the source. The steam can be recovered through directional condensation, and there is no direct discharge of toxic waste gas, thereby completely avoiding secondary pollution.

[0065] As a preferred embodiment, the freezing tank and the heating tank are both double-layer tanks including an outer tank body 19 and an inner tank body 20. The inner tank body is fixedly arranged in the outer tank body, and the outer tank body is fixedly arranged in the cabinet.

[0066] The double-layer tank body not only improves the heat insulation of the freezing tank and the heating tank to avoid mutual influence between them, but also facilitates the installation and arrangement of related pipelines.

[0067] As a preferred embodiment, the oil-containing sludge dewatering and oil removal device further includes a condensation assembly. The condensation assembly includes a condenser 21 and a condensate buffer tank 22. The condenser includes a condenser tank 23 and a coil 24 in the condenser tank. The gas inlet of the condenser is connected to the exhaust port of the heating tank through a pipeline, and the liquid outlet of the condenser is connected to the condensate buffer tank through a pipeline.

[0068] The condenser is arranged to condense the oil-containing steam discharged from the freezing tank or the heating tank, and the condensate buffer tank is arranged to temporarily store the oil-containing condensate formed after condensation, thereby facilitating the treatment of the oil-water mixture by the subsequent oil-water separation device.

[0069] As a preferred embodiment, the gas inlet of the condenser is also connected to the exhaust port of the freezing tank through a pipeline.

[0070] Since a small amount of steam is also generated in the freezing tank during the freezing of the sludge, connecting the freezing tank with the condenser can realize the collection and condensation of the small amount of steam in the freezing tank.

[0071] As a preferred, the number of the condensers is two, the two condensers are connected in series through pipes, and the liquid outlets of the two condensers are both connected with the condensate buffer tank through pipes.

[0072] The condenser directly connected with the freezing tank or the heating tank among the two condensers can realize the preliminary condensation of the steam, and the other condenser can realize the deep condensation of the steam containing low-boiling-point organic matter, thereby improving the condensation effect.

[0073] In specific work, the steam transmitted from the freezing tank or the heating tank can be transmitted to the two condensers in sequence through pipes, and the steam transmitted to the condensers is condensed into liquid oil or water after passing through the internal condensing coils of the condensers, and the oil or water condensed is respectively transmitted to the condensate buffer tank below the condensers through the pipes at the bottom of the condensers under the action of gravity for temporary storage.

[0074] As a preferred, the oil-containing sludge dewatering and oil-removing device further comprises an air extraction device, the air extraction device comprises a vacuum pump and a vacuum buffer tank, the gas outlet of the vacuum buffer tank is connected with the vacuum pump through a pipe, and the gas inlet of the vacuum buffer tank is in communication with the exhaust outlets of the freezing tank, the heating tank and the condenser through a three-way pipe and pipes.

[0075] The setting of the vacuum pump realizes the air extraction function of the freezing tank and the heating tank, thereby reducing the internal gas pressure and the boiling point of the tank body, and further reducing the energy consumption. Meanwhile, the vacuum pump is also connected with the exhaust outlets of the condensers through pipes, so that the steam output from the heating tank or the condensing tank can quickly enter the condensers for condensation, thereby improving the condensation efficiency. The setting of the vacuum buffer tank can avoid the direct entry of the extracted organic matter and water into the vacuum pump during the vacuum extraction process, causing the corrosion of the vacuum pump, and the vacuum buffer tank can control the vacuum degree of the system during the vacuum extraction.

[0076] As a preferred, the oil-containing sludge dewatering and oil-removing device further comprises an oil-water separation device, the oil-water separation device comprises an oil-water separator 25, a water storage tank 26 and an oil storage tank 27, the input port of the oil-water separator is connected with the liquid outlet of the condensate buffer tank through a pipe, the water outlet 28 of the oil-water separator is in communication with the water storage tank through a pipe, and the oil outlet 29 of the oil-water separator is in communication with the oil storage tank through a pipe.

[0077] The setting of the oil-water separation device realizes the efficient separation of oil and water, and the oil-water separator can be a gravity sedimentation type oil-water separator.

[0078] When the liquid in the condensate buffer tank reaches a predetermined height, the operator can open the pipeline connecting the condensate buffer tank and the oil-water separator, and the condensate in the condensate storage tank is transmitted to the oil-water separator under the action of gravity. The oil-water mixture input into the oil-water separator, in which the water settles to the bottom of the oil-water separator under the action of gravity, and the oil floats on the water surface under the action of buoyancy. The pipeline connected to the water storage tank is installed at the bottom end of the oil-water separator, and the pipeline connected to the oil storage tank is installed at the top end of the oil-water separator, so that the water and oil can be respectively output to the water storage tank and the oil storage tank for separate storage.

[0079] The water content of the sludge sample treated by the device can be reduced to below 30%, which is lower than the requirement of the national "Sludge Treatment Technology Regulation for Municipal Sewage Treatment Plant" (CJJ131-2009) that the water content of sludge for landfill should be no higher than 60%; at the same time, the oil content can be reduced to below 2%, meeting the limit value requirement of "Technical Code for Pollution Control of Waste Mineral Oil Recycling" (HJ 607-2011) for the oil content of solid waste after treatment, and the residue after treatment can be safely landfilled.

[0080] The above only describes the preferred embodiments of the present application, which are used to assist those skilled in the art to realize the corresponding technical solutions, and do not limit the protection scope of the present application, which is defined by the appended claims. It should be noted that for those skilled in the art, on the basis of the technical solutions of the present application, a number of equivalent improvements and modifications can be made, which should also be considered as the protection scope of the present application. At the same time, it should be understood that although the present application is described according to the above embodiments, each embodiment only contains one independent technical solution, and the description manner of the specification is only for the sake of clarity, those skilled in the art should consider the specification as a whole, and the technical solutions of each embodiment can be appropriately combined to form other embodiments which can be understood by those skilled in the art.

Claims

1. An oil-containing sludge dewatering and oil removal device, comprising a cabinet (1), characterized in that: The cabinet contains a freezer tank (2), a heating tank (3), a refrigerator (4) for cooling the freezer tank, and a heating device (5) for heating the heating tank. Both the freezer tank and the heating tank are tanks with openings at the bottom and are fixedly installed inside the cabinet. Both the freezer tank and the heating tank are provided with a negative pressure connection port (6) and an exhaust port (7). The cabinet also contains a lifting turntable assembly located below the freezer tank and the heating tank. The lifting turntable assembly includes a turntable (8), and two lifting frames (9) are provided on the surface of the turntable. The top of the lifting frames is provided with a sealing cover (10) that matches the bottom opening of the freezer tank and the heating tank.

2. The oil-containing sludge dewatering and oil removal device according to claim 1, characterized in that: Both the freezing tank and the heating tank are double-layered tanks consisting of an outer tank (19) and an inner tank (20). The inner tank is fixedly installed inside the outer tank, and the outer tank is fixed inside the cabinet.

3. The oil-containing sludge dewatering and oil removal device according to claim 1, characterized in that: It also includes a condensing assembly, which includes a condenser (21) and a condensate buffer tank (22). The condenser includes a condensate tank (23) and a coil (24) inside the condensate tank. The gas inlet of the condenser is connected to the exhaust port of the heating tank through a pipe, and the liquid outlet of the condenser is connected to the condensate buffer tank through a pipe.

4. The oil-containing sludge dewatering and oil removal device according to claim 3, characterized in that: The gas inlet of the condenser is also connected to the exhaust port of the refrigeration tank via a pipe.

5. The oil-containing sludge dewatering and oil removal device according to claim 3, characterized in that: The number of condensers is two, which are connected in series by a pipe, and the liquid outlet of each condenser is connected to a condensate buffer tank by a pipe.

6. The oil-containing sludge dewatering and oil removal device according to claim 3, characterized in that: It also includes an air extraction device, which includes a vacuum pump (14) and a vacuum buffer tank (15). The outlet of the vacuum buffer tank is connected to the vacuum pump through a pipe, and the inlet of the vacuum buffer tank is connected to the exhaust ports (7) of the freezer, the heater and the condenser through a three-way pipe and a pipe respectively.

7. The oil-containing sludge dewatering and oil removal device according to claim 3, characterized in that: It also includes an oil-water separation device, which includes an oil-water separator (25), a water storage tank (26), and an oil storage tank (27). The inlet of the oil-water separator is connected to the liquid outlet of the condensate buffer tank (22) through a pipe. The outlet (28) of the oil-water separator is connected to the water storage tank through a pipe. The outlet (29) of the oil-water separator is connected to the oil storage tank through a pipe.

8. The oil-containing sludge dewatering and oil removal device according to claim 1, characterized in that: It also includes a sludge tank (17), the sludge outlet of which is connected to the inlet of the freezing tank (16) via a pipe.

9. The oil-containing sludge dewatering and oil removal device according to claim 1, characterized in that: The refrigerant in the refrigerator is any one of sodium chloride solution, calcium chloride solution, or water-ethylene glycol solution.

10. The oil-containing sludge dewatering and oil removal device according to claim 1, characterized in that: The turntable is an electric turntable, and the lifting frame is an electric lifting frame.

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