Comprehensive treatment system for waste mineral oil

Abstract

The utility model relates to the technical field of waste liquid treatment, and particularly discloses a comprehensive treatment system for waste mineral oil, which comprises a storage tank, a filter press, a temporary storage tank, a heating device, a centrifugal machine, an oil-water separation device, a reduced pressure distillation device and an ultrafiltration device which are connected in sequence, the storage tank is used for storing waste mineral oil and conveying the waste mineral oil to the filter press, the filter press is used for filtering the waste mineral oil and conveying mother liquor to the temporary storage tank for temporary storage, the heating device is used for heating the mother liquor, and the centrifugal machine is used for separating residues in the mother liquor. The oil-water separation device is used for carrying out oil-water separation and conveying an oil-phase substance to the reduced pressure distillation device, the reduced pressure distillation device is used for carrying out reduced pressure distillation and conveying mineral oil to the ultrafiltration device, and the ultrafiltration device is used for filtering the mineral oil to obtain usable mineral oil. The mineral oil recovery device can recover mineral oil and reduce pollution to the environment.

Description

Technical Field

[0001] The utility model relates to the technical field of waste liquid treatment, in particular to a comprehensive treatment system for waste mineral oil. Background Art

[0002] Mineral oil is a mixture derived from petroleum refining, primarily used in industrial and mining machinery, power plants, transportation equipment, electrical equipment, and metalworking. Waste mineral oil primarily consists of lubricating oil, engine oil, hydraulic oil, transformer oil, rust-proof oil, and solvent oil removed from these equipment. These oils become contaminated with impurities during processing and use, rendering them unusable.

[0003] In the prior art, there is a lack of a treatment system for waste mineral oil, which leads to the loss of mineral oil resources and causes pollution to the environment. Utility Model Content

[0004] The utility model provides a comprehensive treatment system for waste mineral oil, which can recycle the mineral oil and reduce pollution to the environment.

[0005] In order to solve the above problems, the present invention adopts the following technical solutions:

[0006] An embodiment of the utility model provides a comprehensive treatment system for waste mineral oil, comprising a storage tank, a filter press, a temporary storage tank, a heating device, a centrifuge, an oil-water separator, a vacuum distillation device and an ultrafiltration device connected in sequence; the storage tank is used to store the waste mineral oil and transport the waste mineral oil to the filter press, the filter press is used to filter the waste mineral oil and transport the mother liquor to the temporary storage tank for temporary storage, the heating device is used to heat the mother liquor, the centrifuge is used to separate the residue in the mother liquor, the oil-water separator is used to perform oil-water separation and transport the oil phase material to the vacuum distillation device, the vacuum distillation device is used to perform vacuum distillation and transport the mineral oil to the ultrafiltration device, and the ultrafiltration device is used to filter the mineral oil to obtain usable mineral oil.

[0007] In some embodiments, a pressing device is also included, which is connected to both the centrifuge and the oil-water separation device. The centrifuge transports the separated residue to the pressing device, and the pressing device is used to squeeze out the mineral oil remaining in the residue and transport the squeezed mineral oil to the oil-water separation device.

[0008] In some embodiments, the heating device includes a heat exchanger, a hot water inlet pipe, a cold water outlet pipe, a circulation pump and a condenser. The heat exchanger includes two heat exchange channels for heat exchange, wherein the two ends of one heat exchange channel are respectively connected to the temporary storage tank and the centrifuge, and one end of the other heat exchange channel, the cold water outlet pipe, the condenser, the hot water inlet pipe and the other end of the other heat exchange channel are connected in sequence, and a circulation pump is provided in the cold water outlet pipe.

[0009] In some embodiments, the vacuum distillation apparatus is further connected to a condenser to transport steam generated during the vacuum distillation process to the condenser and heat water in the hot water inlet pipe by the steam.

[0010] In some embodiments, the condenser is connected to a collection tank, and the collection tank is used to collect the condensed organic solvent.

[0011] In some embodiments, an exhaust gas treatment device is further included, wherein the exhaust gas treatment device is connected to the condenser to treat the exhaust gas that cannot be condensed.

[0012] The utility model has at least the following beneficial effects: the utility model filters waste mineral oil through a filter press, the filtered mother liquor is heated by a heating device to reduce the viscosity, the centrifuge then separates the residue in the mother liquor, the oil-water separation device performs oil-water separation and transports the oil phase material to a vacuum distillation device, the vacuum distillation device performs vacuum distillation and transports the mineral oil to an ultrafiltration device, the ultrafiltration device filters the mineral oil to obtain usable mineral oil; therefore, the utility model can recover mineral oil in waste mineral oil and reduce pollution to the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic structural diagram of a comprehensive treatment system for waste mineral oil according to an embodiment of the present invention;

[0014] Wherein, the accompanying drawings are marked as follows:

[0015] Storage tank 110, filter press 120, temporary storage tank 130, centrifuge 140, oil-water separator 150, vacuum distillation device 160, ultrafiltration device 170, pressing device 180;

[0016] Heating device 200, heat exchanger 210, hot water inlet pipe 220, cold water outlet pipe 230, circulation pump 240, condenser 250, collection tank 260;

[0017] Exhaust gas treatment device 300. DETAILED DESCRIPTION

[0018] The following description of the present invention, with reference to the accompanying drawings, is provided to facilitate a more comprehensive understanding of the various embodiments of the present invention as defined in the claims and their equivalents. The description includes various specific details to assist understanding, but these details should be construed as merely exemplary. Therefore, those skilled in the art will recognize that various changes and modifications may be made to the various embodiments described herein without departing from the scope and spirit of the present invention.

[0019] In the description of the present invention, descriptions of directions, such as up, down, front, back, left, right, etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as a limitation on the present invention.

[0020] It will be understood that when one element (e.g., a first element) is “connected” to another element (e.g., a second element), the element may be directly connected to the other element or an intervening element (e.g., a third element) may be present between the element and the other element.

[0021] The embodiment of the present invention provides a comprehensive treatment system for waste mineral oil, such as Figure 1 As shown, it includes a storage tank 110, a filter press 120, a temporary storage tank 130, a heating device 200, a centrifuge 140, an oil-water separator 150, a vacuum distillation device 160 and an ultrafiltration device 170 connected in sequence. The storage tank 110 is used to store waste mineral oil for subsequent processing. When the waste mineral oil needs to be processed, the waste mineral oil is transported to the filter press 120, which filters the waste mineral oil, removes the residue in the oil, and transports the mother liquor to the temporary storage tank 130 for temporary storage. The temporary storage tank 130 is used to temporarily store the mother liquor and can deposit some of the remaining residue. When subsequent processing is required, the temporary storage tank 130 then transports the mother liquor to the heating device 200, which is used to heat the mother liquor to reduce the viscosity of the waste mineral oil, facilitating the subsequent process. Centrifuge 140 is used to separate the residue from the mother liquor, allowing the oil to be transported to oil-water separator 150. Oil-water separator 150 is used to separate the oil and water, separating the aqueous phase from the oil phase, and transporting the oil phase to vacuum distillation unit 160. Vacuum distillation unit 160 is used to perform vacuum distillation. The vacuum distillation temperature can be no higher than 80°C. The low-boiling point organic solvent will evaporate and separate. Mineral oil has a higher boiling point and a low volatility. Therefore, the mineral oil can be transported to ultrafiltration unit 170. Ultrafiltration unit 170 is used to filter the mineral oil and further filter out the small amount of coarse particles in the oil residue to obtain usable mineral oil. Therefore, this embodiment can recover mineral oil from waste mineral oil, improve resource reuse, and reduce environmental pollution.

[0022] In some embodiments, the integrated waste mineral oil treatment system further includes a pressing device 180, which is connected to both the centrifuge 140 and the oil-water separator 150. The centrifuge 140 transports the separated residue to the pressing device 180. Since the centrifuged waste oil residue still contains a small amount of mineral oil, the waste residue is transported to the pressing device 180, which squeezes out the residual mineral oil in the residue and transports the squeezed mineral oil to the oil-water separator 150, thereby improving the recovery rate of the mineral oil.

[0023] In this embodiment, a filtering device may be provided at the outlet of the squeezing device 180 to filter out fine residues, so that the oil input to the oil-water separator 150 is cleaner.

[0024] In some embodiments, the heating device 200 includes a heat exchanger 210, a hot water inlet pipe 220, a cold water outlet pipe 230, a circulation pump 240, and a condenser 250. The heat exchanger 210 includes two heat exchange channels for heat exchange, one of which is connected to the temporary storage tank 130 and the centrifuge 140 at both ends, respectively. One end of the other heat exchange channel, the cold water outlet pipe 230, the condenser 250, the hot water inlet pipe 220, and the other end of the other heat exchange channel are sequentially connected. A circulation pump 240 is provided in the cold water outlet pipe 230.

[0025] When the circulation pump 240 is working, water circulates, and the cold water in the cold water outlet pipe 230 enters the condenser 250 and is heated by the condenser 250. The heated hot water enters the heat exchanger 210 through the hot water inlet pipe 220, thereby heating the oil output from the temporary storage tank 130. The hot water itself becomes cold and then enters the condenser 250 through the cold water outlet pipe 230, thereby circulating to heat the oil.

[0026] Furthermore, the vacuum distillation device 160 is also connected to the condenser 250. Since the vacuum distillation device 160 generates high-temperature steam when performing vacuum distillation, the vacuum distillation device 160 can transport the high-temperature steam to the condenser 250, and then perform heat exchange with the water in the hot water inlet pipe 220 to heat the water in the hot water inlet pipe 220. This makes rational use of the steam generated by the vacuum distillation device 160, eliminates the need to configure an additional heating device for the condenser 250, and reduces energy consumption.

[0027] Furthermore, the condenser 250 is connected to a collecting tank 260. Since the steam in the vacuum distillation device 160 also contains an organic solvent, this organic solvent will condense, and the collecting tank 260 can collect the condensed organic solvent.

[0028] In some embodiments, the integrated waste mineral oil treatment system further includes an exhaust gas treatment device 300 , which is connected to the condenser 250 . Non-condensable organic solvents flow into the exhaust gas treatment device 300 in gaseous form, avoiding direct discharge into the atmosphere and reducing environmental pollution. The exhaust gas treatment device 300 may include a spray tower.

[0029] The terms and words used in the above description and claims are not limited to their literal meanings, but are merely used by the applicant to enable a clear and consistent understanding of the present invention. Therefore, it should be clear to those skilled in the art that the above description of various embodiments of the present invention is provided for illustration only and is not intended to limit the present invention as defined in the appended claims and their equivalents.

Claims

1. A comprehensive treatment system for waste mineral oil, characterized by: The invention comprises a storage tank, a filter press, a temporary storage tank, a heating device, a centrifuge, an oil-water separator, a vacuum distillation device and an ultrafiltration device connected in sequence; the storage tank is used to store waste mineral oil and transport the waste mineral oil to the filter press, the filter press is used to filter the waste mineral oil and transport the mother liquor to the temporary storage tank for temporary storage, the heating device is used to heat the mother liquor, the centrifuge is used to separate the residue in the mother liquor, the oil-water separator is used to separate oil and water and transport the oil phase material to the vacuum distillation device, the vacuum distillation device is used to perform vacuum distillation and transport the mineral oil to the ultrafiltration device, and the ultrafiltration device is used to filter the mineral oil to obtain usable mineral oil.

2. The integrated waste mineral oil treatment system according to claim 1, characterized in that: It also includes a pressing device, which is connected to the centrifuge and the oil-water separator. The centrifuge transports the separated residue to the pressing device, and the pressing device is used to squeeze out the mineral oil remaining in the residue and transport the squeezed mineral oil to the oil-water separator.

3. The comprehensive treatment system for waste mineral oil according to claim 1, characterized in that: The heating device includes a heat exchanger, a hot water inlet pipeline, a cold water outlet pipeline, a circulation pump and a condenser. The heat exchanger includes two heat exchange channels for heat exchange, wherein the two ends of one heat exchange channel are respectively connected to the temporary storage tank and the centrifuge, and one end of the other heat exchange channel, the cold water outlet pipeline, the condenser, the hot water inlet pipeline and the other end of the other heat exchange channel are connected in sequence, and a circulation pump is provided in the cold water outlet pipeline.

4. The integrated waste mineral oil treatment system according to claim 3, characterized in that: The vacuum distillation device is also connected to a condenser to transport steam generated during the vacuum distillation process to the condenser and heat water in the hot water inlet pipeline through the steam.

5. The integrated waste mineral oil treatment system according to claim 4, characterized in that: The condenser is connected to a collecting tank, and the collecting tank is used to collect the condensed organic solvent.

6. The comprehensive treatment system for waste mineral oil according to any one of claims 1 to 5, characterized in that: The invention also comprises an exhaust gas treatment device, which is connected to the condenser and is used for treating the exhaust gas that cannot be condensed.

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