CN113546942A - Device and process for oil extraction and extractant recovery in oil-containing solid waste - Google Patents
Device and process for oil extraction and extractant recovery in oil-containing solid waste Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
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Abstract
The invention provides a device and a process for oil extraction and extractant recovery in oil-containing solid waste, wherein a closed feeding machine in the device is used for conveying the oil-containing solid waste into a stirring reaction kettle, and a water tank and a medicine tank are respectively connected with the stirring reaction kettle through a water feeding pump and a medicine feeding pump through pipelines; a liquid outlet of the stirring reaction kettle is connected with a solid-liquid separation centrifugal machine through a plunger pump through a pipeline; a liquid outlet of the solid-liquid separation centrifuge is connected with the first separator through a first liquid supply pump through a pipeline, and the gas A bottle is connected with the first separator through a pipeline; the liquid outlet of the first separator is connected with the second separator through a second liquid supply pump through a pipeline; a liquid outlet of the second separator is connected with a third separator through a third liquid supply pump through a pipeline, and a gas B bottle is connected with the third separator through a pipeline; the liquid outlet of the third separator is connected to a fourth separator via a fourth liquid feed pump via a line. The device has small occupied area, can be operated automatically, and has safe and environment-friendly process reaction process.
Description
Technical Field
The invention relates to a device and a process for oil extraction and extractant recovery in oil-containing solid waste, belonging to the technical field of oil-gas field drilling environment protection in the petroleum industry.
Background
Oil-containing solid wastes, such as oil-containing sludge and oil-based drill cuttings, are generated in the processes of oil and gas exploitation and refining. The oil-containing solid waste contains a large amount of petroleum hydrocarbons, is listed in the category of national hazardous waste (national hazardous waste catalogue, HW08), and inevitably causes environmental pollution if not treated safely and effectively. At present, the oil-based drilling cutting treatment technology is widely researched at home and abroad. The solvent extraction technology has the advantages of good oil removal effect, solvent recycling and the like, but most of the currently adopted extracting agents are expensive, the recovery rate is low, the risks of volatilization and leakage exist, potential safety hazards exist, and the defects cause that the solvent extraction technology is not widely applied to the production practice of oil and gas fields.
In order to solve the problems, various treatment technologies such as pyrolysis, incineration, hot water washing, extraction and the like are developed at home and abroad. The extraction technology can recover petroleum hydrocarbon resources in the oil-containing solid waste and is widely concerned, but the extraction agent can be recovered in modes of flash evaporation and the like, so that the application of the extraction technology is limited. Researchers have developed a variety of novel extractants and associated extraction techniques, including supercritical fluid extraction, microemulsions, novel on-off extractants, and the like. The gas conversion type switch solvent is a solvent with reversible and controllable change of molecular structure and property under different conditions. The gas conversion type switch solvent is used as an extracting agent, after the switch solvent is extracted, the structure of the switch solvent is changed by changing the environmental conditions, the solvent can be easily separated from the system, and after the environmental conditions are changed again, the structure of the switch solvent is changed again, so that the next extraction can be carried out.
The research on the oil removing treatment effect of the oil-based drilling fluid and the oil-based drilling fluid treated by the switch solvent is found in China, mainly in the stages of medicament development and indoor beaker experiment, the test data and results are not very stable, and the research has no definite guiding significance on large-scale industrial trial production.
Therefore, it has become an urgent technical problem in the art to provide a device and a process for oil extraction and extractant recovery in oil-containing solid waste.
Disclosure of Invention
In order to solve the above disadvantages and shortcomings, an object of the present invention is to provide an apparatus for oil extraction and extractant recovery in oil-containing solid wastes.
The invention also aims to provide a process for extracting oil from the oil-containing solid waste and recovering an extracting agent.
In order to achieve the above object, in one aspect, the present invention provides an apparatus for oil extraction and extractant recovery in oil-containing solid waste, wherein the apparatus for oil extraction and extractant recovery in oil-containing solid waste comprises:
the device comprises a closed feeding machine, a stirring reaction kettle, a solid-liquid separation centrifugal machine, a first separator, a second separator, a third separator, a fourth separator, a water tank, a medicine tank, a gas A bottle and a gas B bottle;
the closed feeding machine is used for conveying the oil-containing solid waste into the stirring reaction kettle, and the water tank and the medicine tank are respectively connected with the stirring reaction kettle through a water feeding pump and a medicine feeding pump through pipelines;
a liquid outlet of the stirring reaction kettle is connected with the solid-liquid separation centrifugal machine through a plunger pump through a pipeline;
a liquid outlet of the solid-liquid separation centrifuge is connected with the first separator through a first liquid supply pump through a pipeline, and the gas A bottle is connected with the first separator through a pipeline;
the liquid outlet of the first separator is connected with the second separator through a second liquid supply pump through a pipeline; the liquid outlet of the second separator is connected with the third separator through a third liquid supply pump through a pipeline, and the gas B bottle is connected with the third separator through a pipeline; and the liquid outlet of the third separator is connected with the fourth separator through a fourth liquid supply pump through a pipeline.
In the device, closed material loading machine adopts the bucket to carry and carries oily solid useless, prevents that oily solid useless too much adhesion from causing the transportation smoothly on the belt.
In the device, the water feeding pump and the dosing pump have metering functions.
In the device, the plunger pump adopts hydraulic pressure to adjust the flow, and adjusts the pumping flow according to the condition of the materials discharged from the stirring reaction kettle, thereby preventing the solid-liquid centrifuge from rotating blockage during solid-liquid separation operation to the maximum extent.
Preferably, the device further comprises a reaction kettle support frame, and the reaction kettle support frame is used for supporting the stirring reaction kettle.
Preferably, the apparatus further comprises a centrifuge support for supporting a solid-liquid separation centrifuge.
Preferably, the device further comprises a solid slag collecting barrel, and a solid outlet of the solid-liquid separation centrifuge is connected with the solid slag collecting barrel through a solid slag conveying screw through a pipeline.
Preferably, the device further comprises a bolt fixing frame, and the bolt fixing frame is used for fixing the solid slag conveying screw.
Among the device in the aforesaid, solid-liquid separation centrifuge adopts the centrifugal separation mode to carry out mechanical solid-liquid separation deoiling operation to the material after the stirring of stirred tank reactor, and solid phase residue carries screw conveyor to solid sediment collecting vessel in through solid sediment, and the composition analysis is carried out in the unity of being convenient for, inspects solid sediment oil content, if the oil content is too high then continues to put into closed material loading machine circulation and handles.
In the apparatus described above, preferably, the first separator is provided with a conductivity meter.
Wherein, a person skilled in the art can arrange a conductivity meter at a proper position of the first separator according to the field operation requirement, and can determine the reaction degree in the first separator according to the reading change of the conductivity meter; when all the extractant reactions are completed, the conductivity meter data is stable and unchanged.
In the above-described apparatus, preferably, the third separator is provided with a conductivity meter.
Wherein, a person skilled in the art can arrange a conductivity meter at a suitable position of the third separator according to the field operation requirement, and can determine the reaction degree in the third separator according to the reading change of the conductivity meter; and after all the extractants are reacted, the conductivity meter data is stable and unchanged, and the agent-water separation is completed.
Preferably, the device still includes first sample bucket, second sample bucket, third sample bucket, fourth sample bucket, first sample bucket, second sample bucket, third sample bucket, fourth sample bucket respectively through the pipeline with the sample connection of first separator, second separator, third separator, fourth separator links to each other.
In the above apparatus, preferably, a load cell is disposed below the stirred tank reactor. The weighing sensor is mainly used for measuring the weight of the oil-containing solid waste led in by the closed feeding hopper, and can also be used as a reference for leading in water and dosage by the water feeding pump and the dosing pump.
In the above apparatus, preferably, the closed feeder, the stirred tank reactor, the solid-liquid separation centrifuge, the first separator, the second separator, the third separator, and the fourth separator are placed in a line;
the water tank, the medicine tank, the gas A bottle and the gas B bottle are arranged on one side of the devices which are arranged in a straight line.
In the device, the main equipment such as the closed feeding machine, the stirring reaction kettle, the solid-liquid separation centrifugal machine, the first separator, the second separator, the third separator, the fourth separator and the like are arranged in a straight line shape, so that the space and the pipeline length can be saved.
Preferably, the device also comprises an upper computer which is used for displaying and reading data and automatically controlling the valve in the device.
The data mainly comprises the flow rate of a metering water adding pump, the flow rate of a metering medicine adding pump, the oil-containing solid waste weight, the flow rate of gas A, B, the reading of a conductivity meter and the like.
Preferably, the device further comprises an office chair and an office table, and the upper computer is arranged on the office table. The office chair and the office desk are also arranged on one side of the equipment which is arranged in a straight line.
In the above-mentioned device, all the main operation valves are electrically operated valves, so that it is easy to automatically control.
In the device, the office chair, the office table and the upper computer are matched for use, so that the device can be used for on-site monitoring of testers, and the upper computer integrates the functions of valves, metering, data display and the like of the device. The tester can also operate the electric valve switch arranged in the device and read and record each data on the upper computer.
In the device, a closed feeding machine, a stirring reaction kettle, a solid-liquid separation centrifugal machine, a first separator, a second separator, a third separator, a fourth separator, a water tank, a medicine tank, a gas A bottle, a gas B bottle, an upper computer, a conductivity meter, a weighing sensor and the like are conventional equipment.
In another aspect, the present invention also provides a process for oil extraction and extractant recovery in oil-containing solid waste, wherein the process utilizes the above-mentioned apparatus for oil extraction and extractant recovery in oil-containing solid waste, which comprises the following steps:
(1) stirring and mixing an oil-containing solid waste, an extracting agent with an initial state of oleophylic and hydrophobic and water in a stirring reaction kettle according to a certain proportion to extract oil in the oil-containing solid waste;
(2) carrying out solid-liquid separation on the mixed solution obtained in the step (1) in a solid-liquid separation centrifuge;
(3) injecting the mixed liquid obtained after solid-liquid separation in the step (2) into a first separator, and introducing gas A into the first separator to change the state of the extracting agent into hydrophilic and oleophobic properties;
(4) carrying out oil-liquid separation on the mixed solution obtained in the step (3) in a second separator;
(5) injecting the liquid phase mixture obtained by separation in the step (4) into a third separator, and introducing gas B into the third separator to change the state of the extractant back to oleophilic and hydrophobic;
(6) and (4) separating the extractant and the water from the water and agent mixture obtained in the step (5) in a fourth separator to recover the extractant.
Preferably, the process further comprises analyzing the components and oil content of the solid slag obtained after the solid-liquid separation in the step (2), and if the oil content in the solid slag is too high, conveying the solid slag into the stirring reaction kettle through a closed feeding machine for cyclic treatment.
Wherein, the technical staff in the field can reasonably judge the degree of oil content in the solid slag according to the actual situation on site, and the solid slag needs to be conveyed to the stirring reaction kettle through the closed feeding machine so as to be circularly processed.
In the above process, preferably, in steps (3) and (5), the degree of change in the state of the extraction agent is determined according to the change in the readings of the conductivity meter provided in the first separator and the third separator, and when the readings of the conductivity meter are stable and do not change, the change in the state of the extraction agent is determined.
Namely: when the reading of the conductivity meter arranged in the first separator is stable and does not change, the state of the extracting agent is judged to be changed into hydrophilic and oleophobic; and when the reading of the conductivity meter arranged in the third separator is stable and does not change, judging that the state of the extracting agent is changed into oleophylic and hydrophobic.
In the process, the extractant which is oleophylic and hydrophobic in the initial state is a switch solvent type extractant, and the extractant is oleophylic in the extraction state; in a specific embodiment of the present invention, the extractant which is initially oleophilic and hydrophobic can be a novel extractant disclosed in chinese patent CN109306852A, namely a reversible oil transfer agent containing tetrahydropyran ring.
In the above-mentioned process, those skilled in the art can reasonably select specific substances of gas a and gas B according to the needs of field operation, as long as the purpose of changing the state of the extracting agent can be achieved; in one embodiment of the present invention, the gas A may be, for example, CO2The gas B may be, for example, N2Or air.
In the process, after the oil-containing solid waste, the extractant and the water are stirred by the stirring reaction kettle, the liquid-liquid separation centrifuge performs solid-liquid separation on the liquid phase, the liquid phase enters the first separator, so that the extractant is oleophylic and hydrophobic, the extractant and the oil in the separated liquid phase are mutually soluble and are in a mixed state with the water, at the moment, gas A is introduced into the first separator, the state of the extractant is changed from oleophylic and hydrophobic into hydrophilic and oleophobic, so that the oil in the mixed solution is separated, the mixed liquid is pumped into the second separator to perform oil-liquid separation, and the oil phase is separated; the separated water-solvent mixed liquid phase is in a mutual soluble state and needs to be further separated; and then pumping the liquid phase discharged from the second separator into a third separator, simultaneously introducing gas B, changing the state of the extracting agent back to oleophilic and hydrophobic state, changing the material in the third separator into a mixture of water and the agent, then pumping the mixture of the water and the agent into a fourth separator for agent-water separation, recovering the extracting agent, and properly collecting the sewage.
The device and the process provided by the invention can realize the measurement of the extraction process data of the oil-containing solid waste switching solvent, and the process parameters can be obtained in one experimental process, wherein the process parameters comprise reaction time, solvent dosage, solvent loss amount, solvent property change and the like; the obtained process parameters are stable and reliable, and the subsequent amplification design can be carried out according to the parameters, so that detailed theoretical data support can be provided for the industrialization of technical products of the same type;
the device provided by the invention has small floor area, can be operated automatically, has safe and environment-friendly reaction process, and closed reactor without high temperature and high pressure conditions, and avoids the problems of strong corrosivity, firing potential safety hazard, secondary environmental pollution of strong salt wastewater after reaction and the like in the traditional acid-base extraction method;
the device and the process provided by the invention have broad spectrum and are suitable for oil removal and harmless treatment of various oil-containing solid wastes such as oil-based drilling cuttings, oil-containing wastewater, oil sand, oil-containing sludge and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an apparatus for extracting oil and recovering an extractant from oil-containing solid waste according to an embodiment of the present invention.
FIG. 2 is a side view of an apparatus for oil extraction and extractant recovery in oil-containing solid waste according to an embodiment of the present invention.
Fig. 3 is a flow chart of a process for oil extraction and extractant recovery in oil-containing solid waste according to an embodiment of the present invention.
The main reference numbers illustrate:
1. sealing the feeding machine;
2. stirring the reaction kettle;
3. a reaction kettle support frame;
4. a plunger pump;
5. a solid-liquid separation centrifuge;
6. a centrifuge support;
7. a first liquid supply pump;
8. a first separator;
9. a second liquid supply pump;
10. a second separator;
11. a third separator;
12. a fourth liquid supply pump;
13. a fourth separator;
14. an office table;
15. an upper computer;
16. an office chair;
17. a fourth sampling bucket;
18. a third sampling bucket;
19. a second sampling barrel;
20. a first sampling barrel;
21. a solid slag conveying screw;
22. a bolt fixing frame;
23. a solid slag collecting barrel;
24. adding a water pump;
25. a water tank;
26. a dosing pump;
27. a medicine tank;
28. a gas A bottle;
29. a gas B bottle;
30. a third liquid supply pump;
31. and a weighing sensor.
Detailed Description
In order to clearly understand the technical features, objects and advantages of the present invention, the following detailed description of the technical solutions of the present invention will be made with reference to the following specific examples, which should not be construed as limiting the implementable scope of the present invention.
Example 1
The embodiment provides an apparatus for oil extraction and extractant recovery in oil-containing solid waste, the structural schematic diagram of which is shown in fig. 1, the side view of which is shown in fig. 2, and as can be seen from fig. 1 and 2, the apparatus comprises:
the method comprises the following steps of sealing a feeding machine 1, a stirring reaction kettle 2, a solid-liquid separation centrifuge 5, a first separator 8, a second separator 10, a third separator 11, a fourth separator 13, a water tank 25, a medicine tank 27, a gas A bottle 28 and a gas B bottle 29;
the closed feeding machine 1 is used for conveying the oil-containing solid waste into the stirring reaction kettle 2, and the water tank 25 and the medicine tank 27 are respectively connected with the stirring reaction kettle 2 through a water feeding pump 24 and a medicine feeding pump 26 through pipelines;
the stirring reaction kettle 2 is placed on the reaction kettle support frame 3, and a weighing sensor 31 is arranged below the stirring reaction kettle 2; the solid-liquid separation centrifuge 5 is placed on a centrifuge bracket 6; a liquid outlet of the stirring reaction kettle 2 is connected with the solid-liquid separation centrifugal machine 5 through a plunger pump 4 through a pipeline;
the liquid outlet of the solid-liquid separation centrifuge 5 is connected with the first separator 8 through a first liquid supply pump 7 by a pipeline, and the gas A bottle 28 is connected with the first separator 8 by a pipeline; a solid outlet of the solid-liquid separation centrifuge 5 is connected with the solid slag collecting barrel 23 through a solid slag conveying screw 21 through a pipeline, and the solid slag conveying screw 21 is fixed on a bolt fixing frame 22;
the liquid outlet of the first separator 8 is connected with the second separator 10 through a second liquid supply pump 9 by a pipeline; the liquid outlet of the second separator 10 is connected to the third separator 11 via a third liquid supply pump 30 by a pipeline, and the gas B bottle 29 is connected to the third separator 11 by a pipeline; the liquid outlet of the third separator 11 is connected with the fourth separator 13 through a fourth liquid supply pump 12 by a pipeline;
wherein, the first separator 8 and the third separator 11 are further respectively provided with a conductivity meter (not shown in the figure);
in this embodiment, the apparatus further includes a first sampling barrel 20, a second sampling barrel 19, a third sampling barrel 18, and a fourth sampling barrel 17, where the first sampling barrel 20, the second sampling barrel 19, the third sampling barrel 18, and the fourth sampling barrel 17 are respectively connected to sampling ports of the first separator 8, the second separator 10, the third separator 11, and the fourth separator 13 through pipelines;
in this embodiment, the device further comprises an office system, which comprises an office table 14, an upper computer 15 and an office chair 16, wherein the upper computer 15 is arranged on the office table 14 and is used for displaying data and automatically controlling a valve in the device;
in this embodiment, the closed feeder 1, the stirred tank reactor 2, the solid-liquid separation centrifuge 5, the first separator 8, the second separator 10, the third separator 11, and the fourth separator 13 are placed in a line;
the water tank 25, the medicine tank 27, the gas A bottle 28, the gas B bottle 29, the office table 14, the upper computer 15 and the office chair 16 are arranged on one side of the equipment which is arranged in a straight line shape.
Example 2
The embodiment provides a process for extracting oil and recovering an extracting agent from oil-containing solid waste, which is implemented by using the device for extracting oil and recovering an extracting agent from oil-containing solid waste provided in embodiment 1, and the process flow diagram of the process is shown in fig. 3, and as can be seen from fig. 3, the process comprises the following specific steps:
(1) stirring and mixing an oil-containing solid waste, an extracting agent with an initial state of oleophylic and hydrophobic and water in a stirring reaction kettle 2 according to a certain proportion to extract oil in the oil-containing solid waste;
(2) carrying out solid-liquid separation on the mixed solution obtained in the step (1) in a solid-liquid separation centrifuge 5;
(3) injecting the mixed liquid obtained after solid-liquid separation in the step (2) into a first separator 8, and simultaneously introducing gas A into the first separator 8 to change the state of the extracting agent into hydrophilic and oleophobic properties;
(4) carrying out oil-liquid separation on the mixed solution obtained in the step (3) in a second separator 10;
(5) injecting the liquid phase mixture obtained by the separation in the step (4) into a third separator (11), and simultaneously introducing gas B into the third separator (11) to change the state of the extractant back to oleophilic and hydrophobic;
(6) separating the extractant and the water from the water and agent mixture obtained in the step (5) in a fourth separator 13 to recover the extractant;
in the embodiment, the process further comprises the step of analyzing the components and the oil content of the solid slag obtained after the solid-liquid separation in the step (2), and if the oil content in the solid slag is too high, conveying the solid slag into a stirring reaction kettle through a closed feeding machine for cyclic treatment;
in this embodiment, in the step (3) and the step (5), the state change degree of the extracting agent is determined according to the reading change of the conductivity meter arranged in the first separator and the third separator, and when the reading of the conductivity meter is stable and does not change, the state change of the extracting agent is determined.
In the process, after the oil-containing solid waste, the extractant and the water are stirred by the stirring reaction kettle, the liquid-liquid separation centrifuge performs solid-liquid separation on the liquid phase, the liquid phase enters the first separator, so that the extractant is oleophylic and hydrophobic, the extractant and the oil in the separated liquid phase are mutually soluble and are in a mixed state with the water, at the moment, gas A is introduced into the first separator, the state of the extractant is changed from oleophylic and hydrophobic into hydrophilic and oleophobic, so that the oil in the mixed solution is separated, the mixed liquid is pumped into the second separator to perform oil-liquid separation, and the oil phase is separated; the separated water-solvent mixed liquid phase is in a mutual soluble state and needs to be further separated; and then pumping the liquid phase discharged from the second separator into a third separator, simultaneously introducing gas B, changing the state of the extracting agent back to oleophilic and hydrophobic state, changing the material in the third separator into a mixture of water and the agent, then pumping the mixture of the water and the agent into a fourth separator for agent-water separation, recovering the extracting agent, and properly collecting the sewage.
The device and the process provided by the invention can realize the measurement of the extraction process data of the oil-containing solid waste switching solvent, and the process parameters can be obtained in one experimental process, wherein the process parameters comprise reaction time, solvent dosage, solvent loss amount, solvent property change and the like; the obtained process parameters are stable and reliable, and the subsequent amplification design can be carried out according to the parameters, so that detailed theoretical data support can be provided for the industrialization of technical products of the same type;
the device provided by the invention has small floor area, can be operated automatically, has safe and environment-friendly reaction process, and closed reactor without high temperature and high pressure conditions, and avoids the problems of strong corrosivity, firing potential safety hazard, secondary environmental pollution of strong salt wastewater after reaction and the like in the traditional acid-base extraction method;
the device and the process provided by the invention have broad spectrum and are suitable for oil removal and harmless treatment of various oil-containing solid wastes such as oil-based drilling cuttings, oil-containing wastewater, oil sand, oil-containing sludge and the like.
The above description is only exemplary of the invention and should not be taken as limiting the scope of the invention, so that the invention is intended to cover all modifications and equivalents of the embodiments described herein. In addition, the technical features and the technical inventions of the present invention, the technical features and the technical inventions, and the technical inventions can be freely combined and used.
Claims (15)
1. The device for extracting oil and recovering the extracting agent from the oil-containing solid waste is characterized by comprising the following components:
the device comprises a closed feeding machine (1), a stirring reaction kettle (2), a solid-liquid separation centrifugal machine (5), a first separator (8), a second separator (10), a third separator (11), a fourth separator (13), a water tank (25), a medicine tank (27), a gas A bottle (28) and a gas B bottle (29);
the closed feeding machine (1) is used for conveying the oil-containing solid waste into the stirring reaction kettle (2), and the water tank (25) and the medicine tank (27) are respectively connected with the stirring reaction kettle (2) through a water adding pump (24) and a medicine adding pump (26) through pipelines;
a liquid outlet of the stirring reaction kettle (2) is connected with the solid-liquid separation centrifugal machine (5) through a plunger pump (4) through a pipeline;
the liquid outlet of the solid-liquid separation centrifuge (5) is connected with the first separator (8) through a first liquid supply pump (7) by a pipeline, and the gas A bottle (28) is connected with the first separator (8) by a pipeline;
the liquid outlet of the first separator (8) is connected with the second separator (10) through a second liquid supply pump (9) through a pipeline; the liquid outlet of the second separator (10) is connected with the third separator (11) through a third liquid supply pump (30) through a pipeline, and the gas B bottle (29) is connected with the third separator (11) through a pipeline; the liquid outlet of the third separator (11) is connected to the fourth separator (13) via a fourth liquid feed pump (12) via a line.
2. The apparatus according to claim 1, further comprising a reactor support frame (3), the reactor support frame (3) being adapted to support a stirred reactor (2).
3. The device according to claim 1, characterized in that the device further comprises a centrifuge holder (6), the centrifuge holder (6) being adapted to support a solid-liquid separation centrifuge (5).
4. The apparatus according to claim 1, characterized in that the apparatus further comprises a solid slag collecting barrel (23), and the solid outlet of the solid-liquid separation centrifuge (5) is connected with the solid slag collecting barrel (23) through a solid slag conveying screw (21) by a pipeline.
5. The device according to claim 4, characterized in that it further comprises a bolt holder (22), said bolt holder (22) being used for fixing said solid slag conveyor screw (21).
6. The device according to claim 1, characterized in that the first separator (8) is provided with a conductivity meter.
7. The device according to claim 1, characterized in that the third separator (11) is provided with a conductivity meter.
8. The device according to claim 1, further comprising a first sampling barrel (20), a second sampling barrel (19), a third sampling barrel (18) and a fourth sampling barrel (17), wherein the first sampling barrel (20), the second sampling barrel (19), the third sampling barrel (18) and the fourth sampling barrel (17) are respectively connected with the sampling ports of the first separator (8), the second separator (10), the third separator (11) and the fourth separator (13) through pipelines.
9. The apparatus according to claim 1, characterized in that a load cell (31) is arranged below the stirred tank reactor (2).
10. The device according to claim 1, characterized in that the closed feeder (1), the stirred tank reactor (2), the solid-liquid separation centrifuge (5), the first separator (8), the second separator (10), the third separator (11) and the fourth separator (13) are placed in a straight line;
the water tank (25), the medicine tank (27), the gas A bottle (28) and the gas B bottle (29) are arranged on one side of the devices which are arranged in a straight line.
11. The device according to any one of claims 1 to 10, further comprising an upper computer (15) for displaying data and automatically controlling valves in the device.
12. The device according to claim 11, characterized in that it further comprises a desk (14), a chair (16), said upper computer (15) being placed on said desk (14).
13. A process for oil extraction and extractant recovery in oil-containing solid waste, which is characterized in that the process utilizes the device for oil extraction and extractant recovery in oil-containing solid waste of any one of claims 1 to 12, and comprises the following steps:
(1) mixing an oil-containing solid waste, an extracting agent with an initial state of oleophylic and hydrophobic and water in a stirring reaction kettle (2) according to a certain proportion, and stirring to extract oil in the oil-containing solid waste;
(2) carrying out solid-liquid separation on the mixed solution obtained in the step (1) in a solid-liquid separation centrifuge (5);
(3) injecting the mixed liquid obtained after solid-liquid separation in the step (2) into a first separator (8), and simultaneously introducing gas A into the first separator (8) to change the state of the extractant into hydrophilic oleophobic property;
(4) carrying out oil-liquid separation on the mixed solution obtained in the step (3) in a second separator (10);
(5) injecting the liquid phase mixture obtained by the separation in the step (4) into a third separator (11), and simultaneously introducing gas B into the third separator (11) to change the state of the extractant back to oleophilic and hydrophobic;
(6) and (3) separating the extractant and the water from the water and agent mixture obtained in the step (5) in a fourth separator (13) to recover the extractant.
14. The process according to claim 13, wherein the process further comprises analyzing the components and oil content of the solid slag obtained after the solid-liquid separation in the step (2), and if the oil content in the solid slag is too high, conveying the solid slag into the stirring reaction kettle through a closed feeding machine for recycling treatment.
15. The process according to claim 13 or 14, wherein in the steps (3) and (5), the state change degree of the extracting agent is determined according to the change of the readings of the conductivity meter arranged in the first separator and the third separator, and when the readings of the conductivity meter are stable and not changed, the state change of the extracting agent is judged to be completed.
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| CN202010338346.8A CN113546942A (en) | 2020-04-26 | 2020-04-26 | Device and process for oil extraction and extractant recovery in oil-containing solid waste |
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| CN202010338346.8A CN113546942A (en) | 2020-04-26 | 2020-04-26 | Device and process for oil extraction and extractant recovery in oil-containing solid waste |
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