CN213085802U - Oily sludge treatment system - Google Patents
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- CN213085802U CN213085802U CN202021162875.9U CN202021162875U CN213085802U CN 213085802 U CN213085802 U CN 213085802U CN 202021162875 U CN202021162875 U CN 202021162875U CN 213085802 U CN213085802 U CN 213085802U
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Abstract
The utility model relates to an oily sludge treatment system, which comprises a dehydration unit, a multi-stage extraction unit, a sludge and extractant separation unit and an oil and extractant separation unit; the multistage extraction unit comprises two to six stages of extraction stirrers and a conveyor, wherein the feed inlet and the discharge outlet of each stage of extraction stirrer are sequentially connected through each stage of conveyor, and the extracting agent of each stage of extraction stirrer returns to the previous stage for recycling. The utility model discloses an oily sludge treatment system has that oil, mud separation effect are good, the separation is thorough, pollution-free, environmental protection and the advantage that the energy consumption is low.
Description
Technical Field
The utility model belongs to the technical field of sludge treatment, especially, oily sludge treatment system.
Background
The oily sludge is a concomitant product of petroleum production, is one of main pollution sources of petroleum production, and is a great problem influencing the quality of oil fields and surrounding environments. A large amount of organic matters and rich nutrient substances such as nitrogen, phosphorus, sulfur and the like in the oily sludge are randomly discharged into a water body without being added with stable treatment, the organic matters and ammonia nitrogen in the sludge consume a large amount of oxygen in the water body, so that the water quality of the water body is deteriorated, the survival of aquatic organisms is seriously influenced, the nutrient substances can enable the water body to be eutrophicated, and red tide and green tide are caused in coastal sea areas. In addition, the hazards to the environment and humans from different compositions of oily sludge are different. And because of its large volume, not only occupies a large amount of cultivated land after being discharged, but also causes pollution to surrounding soil, water and air. In addition, the sludge contains a large amount of harmful and toxic substances which are difficult to degrade, such as pathogenic bacteria, parasites (eggs), heavy metals, radionuclides and the like, which are extremely harmful to the health of human beings, are the chief culprits of causing a plurality of fatal diseases, and can be regarded as invisible killers, so the oily sludge of the oil field is listed as dangerous solid waste. China pays more attention to the discharge of oily sludge. It is now well established that willingly discharging untreated oily sludge will be subject to a penalty of a certain amount. This, while limiting the emission of some pollutants, does not solve the problem at all. The treatment of oily sludge is the primary problem to be solved in oil fields.
The oily sludge is an extremely stable suspended emulsion system, has extremely complex components, contains a large amount of aged crude oil, wax, asphaltene, colloid, solid suspended matters, bacteria, salts, acid gas, corrosion products and the like, and also comprises a large amount of water treatment agents such as a coagulant, a corrosion inhibitor, a scale inhibitor, a bactericide and the like added in the production process. The method for treating the oily sludge at home and abroad generally comprises the following steps: incineration, biological treatment, thermal washing, solvent extraction, chemical demulsification, solid-liquid separation, coking, oil-containing sludge profile control, comprehensive utilization of oil-containing sludge, and the like. However, many of these methods have some problems and are not suitable for practical use. For example, the burning method has large energy consumption and is easy to generate secondary pollution, and oil resources are not recycled; the biological treatment method needs 41 days to biodegrade 97% of petroleum hydrocarbon, and oil resources are not recycled; the traditional solvent extraction method has the problems of long flow, complex process and high treatment cost, and is only suitable for oily sludge containing a large amount of refractory organic matters; the chemical demulsification method needs to add a demulsifier and heat for the oil-containing sludge with serious emulsification; the solid-liquid separation method has low oil recovery rate for oily sludge with high oil content and serious pollution. Therefore, the development of a simple, high-efficiency, low-energy consumption and low-cost sludge purification system is urgently needed.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art's not enough, provide an oil-containing sludge treatment system that oil, mud separation effect is good, the separation is thorough, pollution-free, environmental protection and energy consumption are low.
The utility model provides a its technical problem realize through following technical scheme:
the utility model provides an oily sludge treatment system which characterized in that: the method comprises the following steps:
a dehydration unit: the device comprises a dehydration dryer system, wherein the dehydration dryer system comprises a dehydration dryer, a dehydration condenser, a dehydration condensing tank and a dehydration vacuum pump, a sludge outlet of the dehydration dryer is connected to a multistage extraction unit, a gas phase outlet of the dehydration dryer enters the dehydration condensing tank after passing through the dehydration condenser, a gas phase outlet of the dehydration condensing tank is connected to a pressure reducing tower condensing tank through the dehydration vacuum pump, a liquid phase outlet of the dehydration condensing tank is connected to a sewage tank, and an oil phase outlet of the dehydration condensing tank is connected to a solvent recovery tank;
a multi-stage extraction unit: the device comprises two to six stages of extraction stirrers and conveyors, wherein the feed inlet and the discharge outlet of each stage of extraction stirrer are sequentially connected through each stage of conveyor, and the extracting agent of each stage of extraction stirrer returns to the previous stage for recycling;
a sludge and extractant separation unit: the device comprises a deoiling dryer system, a deoiling dryer, a deoiling condenser, a deoiling dryer condensing tank V-111 and a deoiling vacuum pump, wherein a sludge outlet of a multistage extraction stirrer is connected to the deoiling dryer, a sludge outlet of the deoiling dryer is conveyed to a region through a screw conveyor for storage, a gas phase outlet of the deoiling dryer enters the deoiling condensing tank after passing through the deoiling condenser, a gas phase outlet of the deoiling condensing tank is connected to a pressure reduction tower condensing tank through the deoiling vacuum pump, a liquid phase outlet of the deoiling condensing tank is connected to a sewage tank, and an oil phase outlet of the deoiling dryer is connected to a solvent recovery tank;
oil and extractant separation unit: including the decompression tower feeding heater, the decompression tower, decompression tower top of the tower condenser, the decompression tower condensing tank, the water seal jar, get into the decompression tower behind the extraction agent exit linkage decompression tower feeding heater of multistage extraction mechanism, the gas phase export of decompression tower connects the decompression tower condensing tank behind the decompression tower top of the tower condenser, the gas phase export of decompression tower condensing tank is connected to conduction oil furnace after passing through the water seal jar, the water phase export of decompression tower condensing tank is connected to the sewage jar, oil phase exit linkage to solvent recovery jar, heavy solvent export is connected to the decompression tower side line, the waste oil export of decompression tower bottom is carried to the district of ending through the waste oil pump and is deposited.
The multistage extraction unit comprises a primary extraction stirrer, a primary screw conveyor, a primary extraction centrifuge, a secondary extraction stirrer, a secondary screw conveyor, a secondary extraction centrifuge, a tertiary extraction stirrer, a tertiary screw conveyor and a tertiary extraction centrifuge, wherein a sludge outlet of the dehydration dryer is connected to the primary extraction stirrer, an outlet of the primary extraction stirrer is conveyed to the primary extraction centrifuge from the primary screw conveyor, an outlet of the primary extraction centrifuge is connected to the secondary extraction stirrer, and an extract liquid outlet of the primary extraction centrifuge is connected to the decompression tower through a booster pump; the outlet of the second-stage extraction stirrer is connected to a second-stage extraction centrifuge by a second-stage screw conveyor, the second-stage extraction centrifuge pressurizes a second-stage extraction liquid by a pump and then sends the second-stage extraction liquid to the first-stage extraction stirrer, and the outlet of the second-stage extraction centrifuge is connected to a third-stage extraction stirrer; and an outlet of the third-stage extraction stirrer is conveyed to a third-stage extraction centrifuge by a third-stage screw conveyor, the third-stage extraction centrifuge pressurizes a third-stage extracting agent by a pump and then conveys the third-stage extracting agent to a second-stage extraction stirrer, and an outlet of the third-stage extraction centrifuge outputs the third-stage extracting agent to a deoiling dryer of the sludge and extracting agent separation unit.
And after the heavy solvent outlet is pressurized by a circulating pump of the decompression tower, solid particles are filtered by a solvent filter of the decompression tower and then are divided into three paths, the first path is cooled by a circulating cooler of the decompression tower and then returns to a distributor at the top of the filler of the decompression tower, the second path is drawn from the side line of the heavy solvent, the heavy solvent is cooled by the cooler of the heavy solvent and then is sent to a solvent recovery tank, and the third path is returned to the bottom of the decompression tower through flow control.
And, still include hot auxiliary unit, hot auxiliary unit includes heat conduction oil tank, heat conduction oil pump and heat conduction oil stove, and the heat conduction oil tank is connected with the heat conduction oil stove through the heat conduction oil pump, and the exit linkage of heat conduction oil stove is to dehydration dryer, deoiling dryer and vacuum tower feed heater, provides the heat source for dehydration dryer, deoiling dryer and vacuum tower feed heater.
The utility model discloses an advantage and beneficial effect do:
1. the utility model discloses an oily sludge treatment system, adopt multistage extraction system, oil, mud separation effect is good, the separation is thorough, oil, the separation ratio of mud can reach more than 99.7%, the mud ash oiliness rate after the processing is that the total petroleum hydrocarbon TPH of solid phase residue is steerable below 3 permillage, accord with domestic and international oil field general solid waste treatment's ultra-clean emission environmental protection standard, traditional separation technology does not have this effect, for example, traditional solvent extraction method is only suitable for to the oily sludge that contains a large amount of difficult degradation organic matters, solid-liquid separation method is high to the oiliness, the oil recovery rate of the serious oily sludge of pollution is low, biological treatment method need duration 41 days just can be with 97% petroleum hydrocarbon biodegradable etc..
2. The oily sludge treatment system has the characteristics of no pollution and environmental protection; the oil and the mud are thoroughly separated by a multi-stage extraction system through a physical extraction method, and compared with a burning method, no pollutant is generated in the whole process, and the separated crude oil can be recycled.
3. The utility model discloses oily sludge treatment system has the characteristics that the energy consumption is low, just handles moisture in the oily sludge through the dewatering unit majority at the separation initial stage, greatly reduced the energy consumption in separation later stage.
4. In the oily sludge treatment system, the extractant of each stage of extraction stirrer returns to the previous stage for recycling, so that the utilization effect of the extractant is improved; and further recovering the extracting agent through the sludge and extracting agent separating unit and the oil and extracting agent separating unit.
Drawings
FIG. 1 is a flow chart of a system of a dewatering unit of the present invention;
FIG. 2 is a flow chart of a multi-stage extraction unit system of the present invention;
FIG. 3 is a flow chart of a system of a sludge and extractant separation unit of the present invention;
FIG. 4 is a flow diagram of an oil and extractant separation unit system of the present invention;
fig. 5 is a system flow diagram of the thermal assist unit of the present invention.
Reference numerals:
weighing M-101, a dehydration dryer system PK-101 and a deoiling dryer system PK-102;
a dehydration dryer D-101 and a deoiling dryer D-102;
a dehydration condenser E-101, a decompression tower top condenser E-102, a decompression tower circulating cooler E-103, a deoiling condenser E-104, a heavy solvent cooler E-105, a deoiling sludge cooler E-106, a waste oil cooler E-107 and a decompression tower feeding heater E-108;
a heat-conducting oil furnace F-101;
a decompression tower sewage pump P-102, a decompression tower circulating pump P-103, a decompression tower bottom pump P-104, a primary extraction liquid pump P-105, a secondary extraction liquid pump P-106, a tertiary extraction liquid pump P-107, a solvent pump P-108, a deoiling solvent pump P-110, a deoiling sewage pump P-111, a dehydration dirty oil pump P-112, a dehydration sewage pump P-113, a dehydration vacuum pump P-114, a deoiling vacuum pump P-115, a water ring vacuum pump P-116 and a heat conduction oil pump P-117;
a dehydration condensation tank V-101, a primary extraction stirrer V-102, a primary extraction centrifuge V-103, a decompression tower condensation tank V-104, a secondary extraction stirrer V-105, a secondary extraction centrifuge V-106, a tertiary extraction stirrer V-107, a tertiary extraction centrifuge V-108, a sewage tank V-109, a solvent recovery tank V-110, a deoiling condensation tank V-111, a water seal tank V-112 and a heat conduction oil tank V-113;
a vacuum tower T-101;
vacuum column solvent filter M-102.
Detailed Description
The present invention will be described in further detail with reference to specific examples, which are provided for illustrative purposes only, and are not intended to be limiting, and the scope of the present invention should not be limited thereby.
An oily sludge treatment system comprises a dehydration unit, a multistage extraction unit, a sludge and extractant separation unit, an oil and extractant separation unit and a heat auxiliary unit. The concrete structure is as follows:
1) the dehydration unit comprises a dehydration dryer system PK-101, the dehydration dryer system PK-101 comprises a dehydration dryer D-101, a dehydration condenser E-101, a dehydration condensation tank V-101 and a dehydration vacuum pump P-114, a sludge outlet of the dehydration dryer D-101 is connected to the multi-stage extraction unit, a gas phase outlet of the dehydration dryer D-101 enters the dehydration condensation tank V-101 after passing through the dehydration condenser E-101, a gas phase outlet of the dehydration condensation tank V-101 is connected to a decompression tower condensation tank V-104 through the dehydration vacuum pump P-114, a liquid phase outlet is connected to a sewage tank V-109, and an oil phase outlet is connected to a solvent recovery tank V-110 as shown in figure 1; the dehydration dryer D-101 may employ a paddle dryer.
The working process of the dehydration unit is as follows: conveying the oily sludge to be treated to a metering scale M-101 through a shaftless screw conveyor, weighing, conveying the oily sludge to a dehydration dryer system PK-101, heating the oily sludge through a dehydration dryer by steam at 160 ℃, passing through a dehydration condenser E-101 and a dehydration condensing tank V-101, condensing and recycling evaporated steam to a condensed water tank, and periodically conveying the condensed water tank to a sewage treatment system.
The dehydration dryer D-101 is indirectly heated by the heat conducting oil of the heat auxiliary unit, the operation temperature is 120C, the pressure is-10 KPag, and the retention time is 1 h. The gas phase is condensed to 40 ℃ by a dehydration condenser E-101 and is recovered into a dehydration condensation tank V-101. The operation pressure of the dehydration condensation tank is-20 KPag, and the operation temperature is 40 ℃. Gas-water-oil three-phase separation is carried out in a dehydration condensation tank V-101. The gas phase is pumped out by a dehydration vacuum pump P-114 and discharged to a decompression tower condensation tank V-104V-104, the water phase is conveyed to a sewage tank V-109 by a dehydration sewage pump P-113, and the oil phase is discharged to a solvent recovery tank V-110 by a dehydration sewage pump P-112.
2) The multi-stage extraction unit, as shown in fig. 2, comprises two to six stages of extraction stirrers and conveyors, wherein the feed inlets and the discharge outlets of the extraction stirrers at each stage are sequentially connected through the conveyors at each stage, and the extractant of the extraction stirrers at each stage is returned to the previous stage for recycling.
The three-stage extraction unit comprises a first-stage extraction stirrer V-102, a first-stage screw conveyor, a first-stage extraction centrifuge V-103, a second-stage extraction stirrer V-105, a second-stage screw conveyor, a second-stage extraction centrifuge V-106, a third-stage extraction stirrer V-107, a third-stage screw conveyor and a third-stage extraction centrifuge V-108, wherein a sludge outlet of a dehydration dryer is connected to the first-stage extraction stirrer V-102, an outlet of the first-stage extraction stirrer V-102 is conveyed to the first-stage extraction centrifuge V-103 through the first-stage screw conveyor, an outlet of the first-stage extraction centrifuge V-103 is connected to the second-stage extraction stirrer V-105, and an extraction liquid outlet of the first-stage extraction centrifuge V-103 is connected to a pressure reduction tower T-101 through a first-stage extraction; the outlet of the second-stage extraction stirrer V-105 is connected to a second-stage extraction centrifuge V-106 by a second-stage screw conveyor, the second-stage extraction centrifuge V-106 pressurizes second-stage extract liquid by a second-stage extract liquid pump P-106 and then sends the second-stage extract liquid to a first-stage extraction stirrer V-102, and the outlet of the second-stage extraction centrifuge V-106 is connected to a third-stage extraction stirrer V-107; and an outlet of the third-stage extraction stirrer V-107 is sent to a third-stage extraction centrifuge V-108 by a third-stage screw conveyor, a third-stage extraction agent is pressurized by a third-stage extraction liquid pump P-107 by the third-stage extraction centrifuge V-108 and then sent to a second-stage extraction stirrer V-105, and an outlet of the third-stage extraction centrifuge V-108 is output to a deoiling dryer D-102 of a sludge and extraction agent separation unit. The primary extraction stirrer V-102, the secondary extraction stirrer V-105 and the tertiary extraction stirrer V-107 can adopt a double horizontal shaft slurry stirrer. The first-stage extraction centrifuge V-103, the second-stage extraction centrifuge V-106 and the third-stage extraction centrifuge V-108 can adopt horizontal screw centrifuges.
The working process of the three-stage extraction unit is as follows:
the dehydration dryer D-101 is used for dehydrating the oil sludge, weighing and metering the dehydrated oil sludge by a metering feeder, conveying the dehydrated oil sludge to a star-shaped unloader by a conveyor belt, feeding the dehydrated oil sludge into a feeding hole of a primary extraction stirrer V-102, combining the dehydrated oil sludge with the secondary extraction liquid of the previous time, feeding the dehydrated oil sludge into the primary extraction stirrer V-102, stirring, mixing and beating the dehydrated oil sludge into slurry, discharging the slurry from a tail end discharge hole of the primary extraction stirrer V-102, automatically flowing the slurry to a primary screw conveyor, and conveying and extracting the slurry in the primary screw conveyor. The primary extraction stirrer V-102 is a double horizontal shaft slurry stirrer, the operation is carried out under normal pressure, the oily sludge and the secondary extraction liquid are fully mixed and stirred in the primary extraction stirrer V-102, and the retention time is 1 h.
And then the slurry enters a primary extraction centrifuge V-103 from an outlet, after the slurry is centrifugally separated by the primary extraction centrifuge V-103, a liquid phase after centrifugal treatment, namely a primary extraction liquid, is pressurized by a primary extraction liquid pump P-105 and then sent to a decompression tower T-101, and primary extraction oil sludge enters a secondary extraction stirrer V-105.
The first-stage extraction oil sludge is firstly sent to a feed inlet of a second-stage extraction stirrer V-105, is combined with a third-stage extracting agent, enters the second-stage extraction stirrer V-105, is stirred, mixed and beaten into slurry, is discharged from a discharge port at the tail end of the second-stage extraction stirrer V-105, automatically flows to a second-stage screw conveyor, is conveyed and extracted in the second-stage screw conveyor at the same time, and stays for 1 hour. And then the slurry enters a secondary extraction centrifuge V-106 from an outlet, after centrifugal separation, a liquid phase, namely a secondary extraction liquid, is pressurized by a secondary extraction liquid pump P-106 and then conveyed to a primary extraction stirrer V-102, and secondary extraction oil sludge is conveyed to a tertiary extraction stirrer V-107. The solids content of the secondary extraction sludge was about 40 wt%.
The second-stage extraction oil sludge is firstly sent to a feed inlet of a third-stage extraction stirrer V-107, and is mixed with a new extracting agent to enter the third-stage extraction stirrer V-107, and the new extracting agent from a solvent recovery tank V-110 is sent to the third-stage extraction stirrer V-107 after being pressurized by a solvent pump P-108. And then stirring, mixing and beating into slurry, discharging the slurry from a discharge port at the tail end of a secondary extraction stirrer V-105, and automatically flowing to a tertiary screw conveyor, wherein the tertiary extraction stirrer is a double-horizontal-shaft slurry stirrer, the operation is carried out under normal pressure, the oily sludge and the solvent are fully mixed and stirred in the stirrer, and the retention time is 1 h. The slurry enters a three-stage extraction centrifuge V-108 on a three-stage screw conveyor, and after centrifugal separation of the slurry, three-stage extraction liquid is pressurized by a three-stage extraction liquid pump P-107 and then is sent to a two-stage stirrer V-105; and conveying the three-stage extracted oil sludge to a deoiling dryer D-102. The solids content of the tertiary extraction sludge was about 40 wt%.
3) A sludge and extractant separation unit, as shown in fig. 3, comprising a deoiling dryer system PK-102, comprising a deoiling dryer D-102, a deoiling condenser E-104, a deoiling condensing tank V-111 and a deoiling vacuum pump P-115, wherein a sludge outlet of a three-stage extraction stirrer is connected to the deoiling dryer D-102, a sludge outlet of the deoiling dryer D-102 is conveyed to a region for storage by a screw conveyor, a gas phase outlet of the deoiling dryer D-102 enters the deoiling condensing tank V-111 after passing through the deoiling condenser E-104, a gas phase outlet of the deoiling condenser E-104 is connected to a decompression tower condensing tank V-104 by the deoiling vacuum pump P-115, a liquid phase outlet is connected to a sewage tank V-109, and an oil phase outlet is connected to a solvent recovery tank V-110;
the working process of the sludge and extractant separation unit is as follows:
the deoiling dryer D-102 is indirectly heated by heat conducting oil of the heat auxiliary unit, the operation temperature is 260C, the pressure is-50 KPag, the retention time is 1h, the gas phase is condensed to 40 ℃ through the deoiling condenser E-104, the gas phase is recycled to the deoiling condensing tank V-111, the operation pressure of the deoiling condensing tank V-111 is-60 KPag, and the operation temperature is 40 ℃. The three phases of gas, water and oil are separated in a deoiling condensing tank V-111, a gas phase is pumped out by a deoiling vacuum pump P-115 and discharged to a decompression tower condensing tank V-104, a water phase is conveyed to a sewage tank V-109 by a deoiling sewage pump P-111, and an oil phase is conveyed to a solvent recovery tank V-110 by a deoiling solvent pump P-110. And (4) cooling the dried dry sludge reaching the standard to 40 ℃ by a deoiled sludge cooler E-106 through a screw conveyor, and then conveying the dry sludge to a dry sludge stacking yard outside the battery limits.
4) An oil and extractant separation unit is shown in figure 4 and comprises a decompression tower feeding heater E-108, a decompression tower T-101, a decompression tower top condenser E-102, a decompression tower condensing tank V-104 and a water seal tank V-112, wherein a first-stage extraction liquid outlet of a multistage extraction mechanism is connected with the decompression tower feeding heater E-108 and then enters the decompression tower T-101, a gas phase outlet of the decompression tower T-101 passes through the decompression tower top condenser E-102 and then is connected with the decompression tower condensing tank V-104 through a water ring vacuum pump P-116, a gas phase outlet of the decompression tower condensing tank V-104 is connected with a heat conduction oil furnace F-101 hearth through the water seal tank V-112, a water phase outlet of the decompression tower condensing tank V-104 is connected with a sewage tank V-109 through a decompression tower sewage pump P-102, an oil phase outlet is connected with a solvent recovery tank V-110, the aqueous phase is transferred to the waste tank V-109. The pressure reducing tower is connected with a heavy solvent outlet at the side line, and a waste oil outlet at the bottom of the pressure reducing tower is conveyed to the middle area for storage through a pressure reducing tower bottom pump P-104.
And a heavy solvent outlet is pressurized by a decompression tower circulating pump P-103, solid particles are filtered out by a decompression tower solvent filter M-102 and then divided into three paths, the first path is cooled to 90 ℃ by a decompression tower circulating cooler E-103 and then returns to a decompression tower filler top distributor, the second path is drawn from a heavy solvent side line, is cooled to 40 ℃ by a heavy solvent cooler E-105 and then is sent to a solvent recovery tank V-110, and the third path is returned to the bottom of a decompression tower T-101 through flow control.
The working process of the oil and extractant separation unit is as follows:
the extract liquid separated by the first-stage extraction centrifuge V-103 needs to be subjected to vacuum distillation to recover an extracting agent and crude oil, the extract liquid passes through a vacuum tower T-101, a vacuum tower top condenser E-102 and a vacuum tower top condensing tank V-104, the operating condition of vacuum distillation is based on 0.05MPa multiplied by 190 ℃, and the extracting agent recovered by vacuum distillation is removed from a solvent recovery tank V-110. Cooled to 40 ℃ by a heavy solvent cooler E-105 and then sent to a solvent recovery tank V-110. The recovered extractant contains a small amount of wastewater which can become bottom water of the solvent recovery tank V-110 and needs to be automatically discharged into a wastewater treatment system at regular intervals; the recovered crude oil is sent to a crude oil tank.
The bottom of the pressure reducing tower is heavy waste oil, the heavy waste oil is pressurized by a pressure reducing tower bottom pump P-104, and the heavy waste oil passes through a waste oil cooler E-107, is cooled to 170 ℃, and is sent out of a waste oil pool outside a boundary area.
5) The heat auxiliary unit comprises a heat-conducting oil tank V-113, a heat-conducting oil pump P-117 and a heat-conducting oil furnace F-101, wherein the heat-conducting oil tank V-113 is connected with the heat-conducting oil furnace F-101 through the heat-conducting oil pump P-117, an outlet of the heat-conducting oil furnace F-101 is connected to a dehydration dryer, a deoiling dryer D-102 and a decompression tower feeding heater E-108, and heat sources are provided for the dehydration dryer D-101, the deoiling dryer D-102 and the decompression tower feeding heater E-108.
The oil content of the dry sludge treated by the oily sludge treatment system is 0.24 percent. The recovery rate of the condensed and recovered extractant is more than 99.9 percent. The crude oil recovery reaches more than 99.6 percent. Meets the ultra-clean discharge environmental protection standard of domestic and international oil field general solid waste treatment.
Although the embodiments of the present invention and the accompanying drawings have been disclosed for illustrative purposes, those skilled in the art will appreciate that various substitutions, alterations, and modifications are possible without departing from the spirit and scope of the invention and the appended claims, and thus the scope of the invention is not limited to the embodiments and drawings disclosed.
Claims (4)
1. The utility model provides an oily sludge treatment system which characterized in that: the method comprises the following steps:
a dehydration unit: the device comprises a dehydration dryer system (PK-101), wherein the dehydration dryer system (PK-101) comprises a dehydration dryer (D-101), a dehydration condenser (E-101), a dehydration condensing tank (V-101) and a dehydration vacuum pump (P-114), a sludge outlet of the dehydration dryer (D-101) is connected to a multi-stage extraction unit, a gas phase outlet of the dehydration dryer (D-101) enters the dehydration condensing tank (V-101) through the dehydration condenser (E-101), a gas phase outlet of the dehydration condensing tank (V-101) is connected to a decompression tower condensing tank (V-104) through the dehydration vacuum pump (P-114), a liquid phase outlet is connected to a sewage tank (V-109), and an oil phase outlet is connected to a solvent recovery tank (V-110);
a multi-stage extraction unit: the device comprises two to six stages of extraction stirrers and conveyors, wherein the feed inlet and the discharge outlet of each stage of extraction stirrer are sequentially connected through each stage of conveyor, and the extracting agent of each stage of extraction stirrer returns to the previous stage for recycling;
a sludge and extractant separation unit: comprises a deoiling dryer system (PK-102) which comprises a deoiling dryer (D-102), a deoiling condenser (E-104), a deoiling condensing tank (V-111) and a deoiling vacuum pump (P-115), wherein a sludge outlet of a multi-stage extraction stirrer is connected to the deoiling dryer (D-102), a sludge outlet of the deoiling dryer (D-102) is conveyed to a stopping area for storage through a screw conveyer, a gas phase outlet of the deoiling dryer (D-102) enters the deoiling condensing tank (V-111) through the dehydrating condenser (E-101), a gas phase outlet of the deoiling condensing tank (V-111) is connected to a decompression tower condensing tank (V-104) through a deoiling vacuum pump (P-115), a liquid phase outlet is connected to a sewage tank (V-109), and an oil phase outlet is connected to a solvent recovery tank (V-110);
oil and extractant separation unit: comprises a decompression tower feeding heater (E-108), a decompression tower (T-101), a decompression tower top condenser (E-102), a decompression tower condensing tank (V-104) and a water-sealed tank (V-112), wherein an extractant outlet of a multi-stage extraction mechanism is connected with the decompression tower feeding heater (E-108) and then enters the decompression tower (T-101), a gas phase outlet of the decompression tower (T-101) passes through the decompression tower top condenser (E-102) and then is connected with the decompression tower condensing tank (V-104), a gas phase outlet of the decompression tower condensing tank (V-104) passes through the water-sealed tank (V-112) and then is connected with a hearth of a heat-conducting oil furnace (F-101), a water phase outlet of the decompression tower condensing tank (V-104) is connected with a sewage tank (V-109), and an oil phase outlet is connected with a solvent recovery tank (V-110), the side line of the pressure reducing tower (T-101) is connected with a heavy solvent outlet, and a waste oil outlet at the bottom of the pressure reducer is conveyed to an intermediate area for storage through a waste oil pump.
2. The oily sludge treatment system according to claim 1, wherein: the multi-stage extraction unit comprises a first-stage extraction stirrer (V-102), a first-stage screw conveyor, a first-stage extraction centrifuge (V-103), a second-stage extraction stirrer (V-105), a second-stage screw conveyor, a second-stage extraction centrifuge (V-106), a third-stage extraction stirrer (V-107), a third-stage screw conveyor and a third-stage extraction centrifuge (V-108), a sludge outlet of the dehydration dryer (D-101) is connected to a primary extraction stirrer (V-102), an outlet of the primary extraction stirrer (V-102) is conveyed to a primary extraction centrifuge (V-103) by a primary screw conveyor, an outlet of the primary extraction centrifuge (V-103) is connected to a secondary extraction stirrer (V-105), and an extract liquid outlet of the primary extraction centrifuge (V-103) is connected to a decompression tower (T-101) by a booster pump; the outlet of the secondary extraction stirrer (V-105) is connected to a secondary extraction centrifuge (V-106) by a secondary screw conveyor, the secondary extraction centrifuge (V-106) pumps the secondary extraction liquid to the primary extraction stirrer (V-102), and the outlet of the secondary extraction centrifuge (V-106) is connected to a tertiary extraction stirrer (V-107); and an outlet of the three-level extraction stirrer (V-107) is sent to a three-level extraction centrifuge (V-108) by a three-level screw conveyor, the three-level extraction centrifuge (V-108) pressurizes a three-level extractant by a pump and then sends the three-level extractant to a second-level extraction stirrer (V-105), and an outlet of the three-level extraction centrifuge (V-108) is output to a deoiling dryer (D-102) of the sludge and extractant separation unit.
3. The oily sludge treatment system according to claim 1, wherein: and the heavy solvent outlet is pressurized by a decompression tower circulating pump (P-103), solid particles are filtered by a decompression tower solvent filter (M-102) and then divided into three paths, the first path is cooled by a decompression tower circulating cooler (E-103) and then returns to a decompression tower filler top distributor, the second path is drawn by a heavy solvent side line, is cooled by a heavy solvent cooler (E-105) and then is sent to a solvent recovery tank (V-110), and the third path is returned to the bottom of a decompression tower (T-101) through flow control.
4. The oily sludge treatment system according to claim 1, wherein: the heat-conducting oil tank (V-113) is connected with the heat-conducting oil furnace (F-101) through the heat-conducting oil pump (P-117), an outlet of the heat-conducting oil furnace (F-101) is connected to the dehydration dryer (D-101), the deoiling dryer (D-102) and the decompression tower feeding heater (E-108), and a heat source is provided for the dehydration dryer (D-101), the deoiling dryer (D-102) and the decompression tower feeding heater (E-108).
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