CN107308696B - Oil product continuous decoloring system and method - Google Patents
Oil product continuous decoloring system and method Download PDFInfo
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- CN107308696B CN107308696B CN201710576811.XA CN201710576811A CN107308696B CN 107308696 B CN107308696 B CN 107308696B CN 201710576811 A CN201710576811 A CN 201710576811A CN 107308696 B CN107308696 B CN 107308696B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
- B01D24/02—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof with the filter bed stationary during the filtration
- B01D24/10—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof with the filter bed stationary during the filtration the filtering material being held in a closed container
- B01D24/12—Downward filtration, the filtering material being supported by pervious surfaces
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
- B01D24/46—Regenerating the filtering material in the filter
- B01D24/4668—Regenerating the filtering material in the filter by moving the filtering element
- B01D24/4689—Displacement of the filtering material to a compartment of the filtering device for regeneration
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G31/00—Refining of hydrocarbon oils, in the absence of hydrogen, by methods not otherwise provided for
- C10G31/09—Refining of hydrocarbon oils, in the absence of hydrogen, by methods not otherwise provided for by filtration
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/74—Recovery of fats, fatty oils, fatty acids or other fatty substances, e.g. lanolin or waxes
Abstract
The invention discloses a continuous oil product decoloring system which comprises a decoloring mechanism, a finished oil tank, a waste oil tank, a sand storage device and a plurality of connecting pipes. A method for continuously decoloring oil products comprises the following specific processes: decoloring; regeneration; and (5) separating. According to the system and the method for continuously decoloring the oil product, the filter medium is replaced on the premise of not stopping the machine; the regeneration of the filter medium is realized, namely the impurity removal of the filter medium is realized; the regeneration of the polar solvent or the organic solvent is realized; the recycling of the filter medium and the polar solvent or the organic solvent is realized; saves resources and energy and improves the production efficiency.
Description
Technical Field
The invention relates to oil product processing equipment, in particular to a system and a method for continuously decoloring oil products.
Background
Most of the fuel oil or lubricating oil sold in the market at present is extracted from crude oil, the crude oil shows dark color due to a large amount of colloid and asphaltene in the crude oil, and the fuel oil extracted from the crude oil also has high chroma and can be put into use only after being decolored to reach the chroma range specified by the state. Meanwhile, a large amount of lubricating oil is needed for mechanical transmission, and the used lubricating oil is generally directly discarded, so that the environment is polluted, and the resource waste is also caused. In recent years, the degree of recycling of lubricating oil has increased, relying mainly on filtration and separation equipment; generally, the simple working process of the filter is that crude oil or lubricating oil containing impurities adsorbs and retains impurities in water or oil through a filter medium in the filter so as to achieve the aim of removing the impurities.
The Chinese patent with the application number of 200910259135.9 and the application number of Jinan development area starfire science and technology research institute discloses oil product decoloring equipment which mainly comprises an oil inlet pipeline, an oil outlet pipeline and a decoloring kettle, wherein an inlet and an outlet of the decoloring kettle are respectively connected with the oil inlet pipeline and the oil outlet pipeline in series, and a decoloring device is arranged in the decoloring kettle.
The oil product decoloring equipment and the existing filter have the following problems: after filtration (decolorization), the filtration (decolorization) medium is polluted and blocked by impurities, and then the filtration (decolorization) function cannot be continuously realized, the existing method is a mode of disassembling the filtration (decolorization) device, then taking out the polluted filtration (decolorization) medium and adding a new filtration (decolorization) medium, and for the condition, some filtration (decolorization) devices which are easy to disassemble and assemble and replace the filtration (decolorization) medium appear, but no matter how the filtration (decolorization) device is changed, the improvement of the type needs a mode of stopping the operation of the filtration (decolorization) device and then replacing the filtration (decolorization) medium, so that the production is interrupted, and all equipment on the whole production line needs to be stopped due to the shutdown of the filtration (decolorization) device, and the production efficiency is reduced; meanwhile, the starting and stopping conditions of some equipment are more, so that the cost is high.
The invention aims to solve the technical problems of realizing the replacement of the filter medium in the sand filter and realizing the continuous operation of the whole production line on the premise of not stopping the sand filter.
Disclosure of Invention
The invention aims to provide a system and a method for continuously decoloring oil products, which are used for solving the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a continuous oil decoloring system comprises a decoloring mechanism, a finished oil tank, a sand storage device and a plurality of connecting pipes, wherein each connecting pipe comprises a liquid communicating pipe and a sand circulating pipe, the decoloring mechanism comprises a first sand filter, each first sand filter comprises a filtering barrel, a sand discharging device and a power transmission device, an oil inlet, an oil outlet and a sand flushing port are formed in the wall of the filtering barrel, the oil inlet is connected with oil to be processed, the oil outlet and the sand flushing port are respectively connected with the finished oil tank through the liquid communicating pipes, a filtering net is arranged in the filtering barrel, the oil inlet and the oil outlet are respectively positioned at the lower part and the upper part of the filtering net, one end of the filtering barrel is covered through an end cover, a sand inlet is formed in the end cover, and the sand inlet is connected with the sand storage device through a sand flowing pipe; the sand discharge device comprises a sand discharge pipe and a screw extrusion shaft, the screw extrusion shaft is arranged in the sand discharge pipe, the lower end of the sand discharge pipe extends into the filter cylinder body and is positioned at the bottom of the filter cylinder body, and the upper end of the sand discharge pipe extends out of the filter cylinder body through an end cover; the power transmission mechanism comprises a motor, a belt wheel and a bearing, the motor is fixedly connected with the outer wall of the upper end of the sand discharge pipe through a motor base, the belt wheel is arranged at the upper end of the sand discharge pipe, the bearing is arranged at the bottom of the filtering barrel, the lower end of the screw extrusion shaft is connected with the bearing, the upper end of the screw extrusion shaft is connected with the belt wheel, and the belt wheel is connected with the motor through a belt.
By adopting the technical scheme, the oil to be treated enters the first sand filter from the oil inlet and is filtered and then discharged from the oil outlet, the filtering medium containing impurities is driven by the rotation of the screw extrusion shaft to move along the sand discharge pipe and is discharged out of the filter cylinder body, and meanwhile, the sand storage device injects sand into the sand filter, so that the replacement of the filtering medium is realized, the continuous production operation of the sand filter is ensured, and the continuous decoloration operation is realized.
The invention is further improved, and the wall of the filtering cylinder body is also provided with an observation window so as to conveniently check the impurity-containing condition of the filtering medium in the filtering cylinder body.
The invention is further improved, an oil pipeline is also arranged in the filter cylinder body, one end of the oil pipeline is connected with the oil inlet, and the other end of the oil pipeline extends into the bottom of the filter cylinder body; the filtering direction of an oil product to be treated from bottom to top is guaranteed, so that a filtering medium containing impurities is located at the bottom of a filtering cylinder, the discharged filtering medium containing impurities is sequentially discharged firstly when the impurities are more and discharged secondly when the impurities are less, namely, the impurity content of the filtering medium in the filtering cylinder is gradually increased from bottom to top, and the sand discharging sequence is that the lower part is discharged firstly and the upper part is discharged secondly.
The invention further improves the device, and the device also comprises a regeneration mechanism, a waste oil tank and a polar solvent tank, wherein the regeneration mechanism comprises a second sand filter, a centrifugal drier, a heat exchanger, an oil-water separator, a cooler and a blower, the structure of the second sand filter is completely the same as that of the first sand filter, a sand inlet of the second sand filter is connected with a sand discharge pipe of the first sand filter through a sand communicating pipe, an oil inlet and a sand flushing port of the second sand filter are respectively connected with the polar solvent tank through a liquid communicating pipe, an oil outlet of the second sand filter is connected with a feed inlet of the oil-water separator through a liquid communicating pipe, a sand discharge pipe of the second sand filter is connected with a sand inlet of the centrifugal drier through a sand communicating pipe, a sand outlet of the centrifugal drier is connected with a sand inlet of the heat exchanger through a sand communicating pipe, a liquid outlet of the centrifugal drier is connected with a feed inlet of the oil-water separator through a liquid communicating pipe, an air inlet, an air outlet and a discharge port of the heat exchanger are also arranged on the heat exchanger, an air outlet of the heat exchanger is connected with a feed inlet of the oil-water separator after being connected with the oil-water storage tank through a liquid communicating pipe, and a discharge port of the polar solvent storage tank are respectively connected with a discharge port of the waste oil storage device through a sand communicating pipe.
Therefore, the regeneration treatment of the filter medium in the decoloring mechanism is realized, the cyclic utilization of the filter medium in the whole decoloring system is realized, and the resources and the energy are saved.
The invention further improves the structure and also comprises a discharger which is arranged at the discharge opening of the heat exchanger and realizes uniform downward discharge of the filter medium.
The invention is further improved and also comprises a first cyclone separator and a second cyclone separator, wherein the feed inlet of the first cyclone separator is connected with the discharge port of the heat exchanger through a sand communicating pipe, the gas outlet of the first cyclone separator is connected with the feed inlet of the second cyclone separator, the ash hopper of the first cyclone separator and the ash hopper of the second cyclone separator are respectively connected with a sand storage device, and the gas outlet of the second cyclone separator is connected with a gas collection device or a burner; the solid-gas separation of the regenerated filter medium is realized.
A method for continuously decoloring oil comprises the following specific processes:
1. decoloring, namely decoloring the oil product to be treated through the filtering operation of a first sand filter, collecting the decolored finished oil product by a finished oil tank, and discharging a filtering medium (sand) containing impurities out of the first sand filter;
2. regenerating, wherein after the filter medium (sand) containing impurities enters a second sand filter, a polar solvent or an organic solvent is introduced into the second sand filter from a polar solvent tank, and the impurities are dissolved in the polar solvent or the organic solvent and are discharged into an oil-water separator along with the polar solvent or the organic solvent from an oil outlet of the second sand filter; the solid-liquid separation of the filtering medium (sand) containing polar solvent or organic solvent in the centrifugal drier, the solid filtering medium (sand) in the heat exchanger, the liquid polar solvent or organic solvent from the liquid outlet of the centrifugal drier to the oil-water separator; introducing high-temperature gas into the heat exchanger to gasify a small amount of polar solvent or organic solvent in the filter medium (sand) at the moment, cooling the gasified polar solvent or organic solvent by a cooler, and then introducing the gasified polar solvent or organic solvent into an oil-water separator; at the moment, the regeneration operation of the filter medium (sand) of impurities is finished, and the filter medium (sand) enters a sand storage device through the feeding of a blower and the solid-gas separation of a cyclone separator, so that the cyclic utilization of the filter medium (sand) is finished; meanwhile, the generated combustible gas is collected by a gas collecting device or is used for supplying fuel for a combustor;
3. and (3) separating, namely separating impurities and the polar solvent or the organic solvent in an oil-water separator, and respectively conveying the impurities and the polar solvent into a waste oil tank and a polar solvent tank.
Compared with the prior art, the invention has the following advantages:
1. the replacement of the filter medium is realized on the premise of no shutdown;
2. the regeneration of the filter medium is realized, namely the impurities of the filter medium are removed;
3. the regeneration of the polar solvent or the organic solvent is realized;
4. the recycling of the filter medium and the polar solvent or the organic solvent is realized;
5. saves resources and energy and improves the production efficiency.
Drawings
FIG. 1 is a schematic perspective view of a continuous oil decoloring system according to the present invention.
Fig. 2 is a schematic perspective view of a second sand filter.
Fig. 3 is a schematic front view of the second sand filter.
Fig. 4 isbase:Sub>A schematic view of the structurebase:Sub>A-base:Sub>A in fig. 3.
Fig. 5 is an enlarged view of the part B in fig. 1.
Fig. 6 is an enlarged schematic view of the structure of the part C in fig. 1.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-6, a continuous oil product decoloring system comprises a decoloring mechanism, a finished oil tank 3, a sand storage device 6 and a plurality of connecting pipes, wherein each connecting pipe comprises a liquid communicating pipe 15 and a sand communicating pipe 16, the decoloring mechanism comprises a first sand filter 1, each first sand filter 1 comprises a filter cylinder 101, a sand discharge device and a power transmission device, the cylinder wall of each filter cylinder 101 is provided with an oil inlet 1011, an oil outlet 1012 and a sand flushing port 1013, each oil inlet 1011 is connected with an oil product to be processed, each oil outlet 1012 and each sand flushing port 1013 are respectively connected with the finished oil tank 3 through the liquid communicating pipe 15, a filter screen 1014 is arranged in each filter cylinder 101, each oil inlet 1011 and each oil outlet 1012 are respectively positioned at the lower part and the upper part of the filter screen 1014, one end of each filter cylinder 101 is covered by an end cover 1015, each end cover 1015 is provided with a sand inlet, and each sand inlet is connected with the sand storage device 6 through the sand communicating pipe 16; the sand discharge device comprises a sand discharge pipe 102 and a screw extrusion shaft 103, the screw extrusion shaft 103 is arranged in the sand discharge pipe 102, the lower end of the sand discharge pipe 102 extends into the filtering cylinder 101 and is positioned at the bottom of the filtering cylinder 101, and the upper end of the sand discharge pipe 102 extends out of the filtering cylinder 101 through an end cover 1015; the power transmission mechanism comprises a motor 104, a belt wheel 105 and a bearing 106, the motor 104 is fixedly connected with the outer wall of the upper end of the sand discharge pipe 102 through a motor base, the belt wheel 105 is arranged at the upper end of the sand discharge pipe 102, the bearing 106 is arranged at the bottom of the filtering cylinder body 101, the lower end of the screw extrusion shaft 103 is connected with the bearing 106, the upper end of the screw extrusion shaft 103 is connected with the belt wheel 105, and the belt wheel 105 is connected with the motor 104 through a belt.
By adopting the technical scheme, oil to be treated enters the first sand filter 1 from the oil inlet 1011 and is filtered and then is discharged from the oil outlet 1012, a filter medium containing impurities is driven by the rotation of the screw extrusion shaft 103 to move along the sand discharge pipe 102 and is discharged out of the filtering cylinder 101, and meanwhile, the sand storage device 6 injects sand into the sand filter, so that the replacement of the filter medium is realized, the continuous production operation of the sand filter is ensured, and the continuous decoloration operation is realized.
The invention is further improved, and the wall of the filtering cylinder 101 is also provided with an observation window 1017, so that the condition that the filtering medium in the filtering cylinder 101 contains impurities can be conveniently checked.
The invention is further improved, an oil delivery pipe 1016 is also arranged in the filtering cylinder 101, one end of the oil delivery pipe 1016 is connected with the oil inlet 1011, and the other end of the oil delivery pipe 1016 extends into the bottom of the filtering cylinder 101; the filtering direction of the oil product to be treated from bottom to top is ensured, so that the filtering medium containing impurities is positioned at the bottom of the filtering cylinder 101, the discharged filtering medium containing impurities is discharged first when the impurities are more, and then discharged when the impurities are less, namely, the impurity content of the filtering medium in the filtering cylinder 101 is increased progressively from bottom to top, and the sand discharging sequence is that the lower part is discharged first, and the upper part is discharged later.
The invention further improves, the invention also includes the regenerating mechanism, the waste oil tank 4 and the polar solvent tank 5, the regenerating mechanism includes the second sand filter 2, the centrifugal drier 8, the heat exchanger 7, the oil-water separator 10, the cooler 9 and the blower 12, the second sand filter 2 and the first sand filter 1 have the same structure, the sand inlet of the second sand filter 2 is connected with the sand discharge pipe of the first sand filter 1 through the sand communicating pipe 16, the oil inlet and the sand flushing port of the second sand filter 2 are connected with the polar solvent tank 5 through the liquid communicating pipe 15, the oil outlet of the second sand filter 2 is connected with the feed inlet of the oil-water separator 10 through the liquid communicating pipe 15, the sand discharge pipe of the second sand filter is connected with the sand inlet of the centrifugal drier 8 through the sand communicating pipe 16, the sand outlet of the centrifugal drier 8 is connected with the sand inlet of the heat exchanger 7 through the sand communicating pipe 16, the liquid outlet of the centrifugal drier 8 is connected with the feed inlet of the oil-water separator 10 through the liquid communicating pipe 15, the air inlet 7 is also provided with the oil tank, the air outlet and the discharge port of the waste oil-water separator 7 are connected with the discharge pipe 6 through the oil-water separator 10 and the polar solvent discharge pipe 16, the oil-water separator 6 is connected with the discharge pipe 12, the oil-water discharge device 6.
Therefore, the regeneration treatment of the filter medium in the decoloring mechanism is realized, the recycling of the filter medium in the whole decoloring system is realized, and the resources and the energy are saved.
The invention further improves, and also comprises a discharger 11, wherein the discharger 11 is arranged at the discharge opening of the heat exchanger 7, and uniform downward discharge of the filter medium is realized.
The invention is further improved, also include the first cyclone 13 and second cyclone 14, the feed inlet of the first cyclone 13 is connected with discharge outlet of the heat exchanger 7 through the sand communicating pipe 16, the gas outlet of the first cyclone 13 is connected with feed inlet of the second cyclone 14, the ash bucket of the first cyclone 13, the ash bucket of the second cyclone 14 are connected with sand storing device 6 separately, the gas outlet of the second cyclone 14 is connected with gas collecting device or burner; the solid-gas separation of the regenerated filter medium is realized.
A method for continuously decoloring oil comprises the following specific processes:
1. decoloring, namely decoloring the oil product to be treated through the filtering operation of the first sand filter 1, collecting the decolored finished oil product by a finished oil tank 3, and discharging the impurity-containing filter medium (sand) out of the first sand filter 1;
2. regenerating, after the filter medium (sand) containing impurities enters the second sand filter 2, introducing a polar solvent or an organic solvent into the second sand filter 2 from the polar solvent tank 5, dissolving the impurities in the polar solvent or the organic solvent and discharging the impurities into the oil-water separator 10 from an oil outlet of the second sand filter 2 along with the polar solvent or the organic solvent; the solid-liquid separation is carried out on the filtering medium (sand) containing the polar solvent or the organic solvent in the centrifugal drier 8, the solid filtering medium (sand) enters the heat exchanger 7, and the liquid polar solvent or the organic solvent is discharged into the oil-water separator 10 from the liquid outlet of the centrifugal drier 8; introducing high-temperature gas into the heat exchanger 7 to gasify a small amount of polar solvent or organic solvent in the filter medium (sand) at the moment, cooling the gasified solvent or organic solvent by the cooler 9, and then feeding the gasified solvent into the oil-water separator 10; at the moment, the regeneration operation of the filter medium (sand) of impurities is finished, and the filter medium (sand) enters the sand storage device 6 through the feeding of the blower 12 and the solid-gas separation of the cyclone separator, so that the recycling of the filter medium (sand) is finished; meanwhile, the generated combustible gas is collected by a gas collecting device or is used for supplying fuel for a combustor;
3. and (3) separating impurities and the polar solvent or the organic solvent in the oil-water separator 10, and respectively conveying the impurities and the polar solvent into the waste oil tank 4 and the polar solvent tank 5.
Compared with the prior art, the invention has the following advantages:
1. the replacement of the filter medium is realized on the premise of no shutdown;
2. the regeneration of the filter medium is realized, namely the impurities of the filter medium are removed;
3. the regeneration of the polar solvent or the organic solvent is realized;
4. the recycling of the filter medium and the polar solvent or the organic solvent is realized;
5. saves resources and energy and improves the production efficiency.
It should be noted that the directional terms, such as "upper", "lower", etc., appearing herein refer to directions on the drawings in the specification, and are used for brevity of description only, and do not refer to or imply actual product directions, and thus do not limit the scope of protection of the present patent.
The foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. The utility model provides a continuous decoloration system of oil, includes decoloration mechanism, finished oil tank, stores sand device and a plurality of connecting pipe, its characterized in that: the connecting pipe comprises a liquid communicating pipe and a sand communicating pipe, the decoloring mechanism comprises a first sand filter, the first sand filter comprises a filtering barrel, a sand discharging device and a power transmission device, an oil inlet, an oil outlet and a sand flushing port are formed in the wall of the filtering barrel, the oil inlet is connected with an oil product to be processed, the oil outlet and the sand flushing port are respectively connected with a finished oil tank through the liquid communicating pipe, a filter screen is arranged in the filtering barrel, the oil inlet and the oil outlet are respectively positioned at the lower part and the upper part of the filter screen, one end of the filtering barrel is covered through an end cover, a sand inlet is formed in the end cover and is connected with the sand storage device through the sand communicating pipe, and the lower end of the sand communicating pipe penetrates through the filter screen to be communicated with the inside of the filtering barrel; the sand discharge device comprises a sand discharge pipe and a screw extrusion shaft, the screw extrusion shaft is arranged in the sand discharge pipe, the lower end of the sand discharge pipe extends into the filter cylinder body and is positioned at the bottom of the filter cylinder body, the upper end of the sand discharge pipe extends out of the filter cylinder body through an end cover, and the upper end of the sand discharge pipe is connected with a sand communicating pipe for discharging a filter medium containing impurities; the power transmission device is connected with the screw extrusion shaft to realize the rotation of the screw extrusion shaft;
the regeneration mechanism comprises a second sand filter, a centrifugal drier, a heat exchanger, an oil-water separator, a cooler and a blower, the structure of the second sand filter is completely the same as that of the first sand filter, a sand inlet of the second sand filter is connected with a sand discharge pipe of the first sand filter through a sand communicating pipe, an oil inlet and a sand flushing port of the second sand filter are respectively connected with the polar solvent tank through liquid communicating pipes, an oil outlet of the second sand filter is connected with a feed inlet of the oil-water separator through a liquid communicating pipe, a sand discharge pipe of the second sand filter is connected with a sand inlet of the centrifugal drier through a sand communicating pipe, a sand outlet of the centrifugal drier is connected with a sand inlet of the heat exchanger through a sand communicating pipe, a liquid outlet of the centrifugal drier is connected with a feed inlet of the oil-water separator through a liquid communicating pipe, an air inlet, an air outlet and a discharge port are further arranged on the heat exchanger, an air outlet of the heat exchanger is connected with a feed inlet of the oil-water separator after being connected with the cooler through a liquid communicating pipe, a discharge port of the heat exchanger is connected with a discharge pipe, a discharge port of the oil-water separator and a discharge port of the waste oil tank are respectively connected with a discharge port of the polar solvent blower through a liquid communicating pipe.
2. The continuous oil product decolorization system according to claim 1, characterized in that: the power transmission mechanism comprises a motor, a belt wheel and a bearing, the motor is fixedly connected with the outer wall of the upper end of the sand discharge pipe through a motor base, the belt wheel is arranged at the upper end of the sand discharge pipe, the bearing is arranged at the bottom of the filtering barrel, the lower end of the screw extrusion shaft is connected with the bearing, the upper end of the screw extrusion shaft is connected with the belt wheel, and the belt wheel is connected with the motor through a belt.
3. The continuous oil product decolorization system according to claim 1, characterized in that: the wall of the filtering cylinder body is also provided with an observation window.
4. The continuous oil product decolorization system according to claim 1, characterized in that: an oil delivery pipe is further arranged in the filter cylinder body, one end of the oil delivery pipe is connected with the oil inlet, and the other end of the oil delivery pipe extends into the bottom of the filter cylinder body.
5. The continuous oil product decolorization system according to claim 1, characterized in that: the heat exchanger also comprises a discharger, and the discharger is arranged at the discharge opening of the heat exchanger.
6. The continuous oil product decolorization system according to claim 1, characterized in that: the cyclone separator also comprises a first cyclone separator and a second cyclone separator, wherein a feed inlet of the first cyclone separator is connected with a discharge opening of the heat exchanger through a sand communicating pipe, a gas outlet of the first cyclone separator is connected with a feed inlet of the second cyclone separator, an ash hopper of the first cyclone separator and an ash hopper of the second cyclone separator are respectively connected with a sand storage device, and a gas outlet of the second cyclone separator is connected with a gas collection device or a combustor.
7. A method for continuously decoloring oil products is characterized by comprising the following process steps:
1. decolorizing, namely decolorizing the oil product to be treated through the filtering operation of a first sand filter, collecting the decolorized product oil from a product oil tank, and discharging the impurity-containing filter medium out of the first sand filter;
2. regenerating, wherein after the filter medium containing impurities enters the second sand filter, a polar solvent or an organic solvent is introduced into the second sand filter from the polar solvent tank, and the impurities are dissolved in the polar solvent or the organic solvent and are discharged into the oil-water separator from an oil outlet of the second sand filter along with the polar solvent or the organic solvent; the solid-liquid separation of the filtering medium containing polar solvent or organic solvent in the centrifugal drier, the solid filtering medium in the heat exchanger and the discharge of the liquid polar solvent or organic solvent from the liquid outlet of the centrifugal drier to the oil-water separator; introducing high-temperature gas into the heat exchanger to ensure that a small amount of polar solvent or organic solvent in the filter medium is gasified, cooled by the cooler and then enters the oil-water separator; at the moment, the regeneration operation of the filter medium of the impurities is finished, and the filter medium enters a sand storage device through the feeding of a blower and the solid-gas separation of a cyclone separator, so that the cyclic utilization of the filter medium is finished; meanwhile, the generated combustible gas is collected by a gas collecting device or is used for supplying fuel for a combustor;
3. and (3) separating, namely separating impurities and the polar solvent or the organic solvent in an oil-water separator, and respectively conveying the impurities and the polar solvent into a waste oil tank and a polar solvent tank.
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