CN112390508A - Oil refinery oily sludge treatment system and process - Google Patents
Oil refinery oily sludge treatment system and process Download PDFInfo
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- CN112390508A CN112390508A CN202011505334.6A CN202011505334A CN112390508A CN 112390508 A CN112390508 A CN 112390508A CN 202011505334 A CN202011505334 A CN 202011505334A CN 112390508 A CN112390508 A CN 112390508A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
- C02F2103/36—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from the manufacture of organic compounds
- C02F2103/365—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from the manufacture of organic compounds from petrochemical industry (e.g. refineries)
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- Mechanical Engineering (AREA)
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- Treatment Of Sludge (AREA)
Abstract
The invention relates to the field of treatment of pollutants in an oil refinery, in particular to a system and a process for treating oily sludge in the oil refinery, which comprises a feeding reaction tank, wherein the feeding reaction tank is connected with a primary precipitation separation tank, the primary precipitation separation tank is connected with a solid-liquid separation dehydrator, the output end of the solid-liquid separation dehydrator is connected with a secondary four-phase separation tank, the output end of a slag phase separator of the secondary four-phase separation tank is connected with the primary precipitation separation tank, the secondary four-phase separation tank is respectively connected with a dirty oil aging separation tank, the three-stage four-phase separation tank is connected with the two-stage solid-liquid separator, the suspended separator output end and the slag phase separator output end of the three-stage four-phase separation tank are respectively connected with the first-stage precipitation separation tank, the oil phase separation liquid output end of the three-stage four-phase separation tank is connected with the dirty oil aging separation tank, and the separation liquid output end of the two-stage solid-liquid separator is connected with the three-stage four-phase separation tank. The system and the process can ensure that the treated sludge and sewage reach the environmental protection index, and can recover fuel oil.
Description
Technical Field
The invention relates to the field of treatment of pollutants in a refinery, in particular to a system and a process for treating oily sludge in the refinery.
Background
The oily sludge (three sludge) of petroleum refining enterprises mainly comes from an oil separation tank, a flotation tank, a biochemical treatment tank, a crude oil dehydration tank, an oil storage tank and a sump oil tank. These oil-containing sludges generally contain hydrocarbon compounds, benzene compounds, phenol compounds, anthracene compounds, and the like. The emulsion is complete in emulsification and high in viscosity, belongs to a stable multiphase system, and has the defects of difficulty in thorough sedimentation of a solid phase and great treatment difficulty. At present, the oily sludge is generally treated by adopting a direct landfill mode, but harmful substances and crude oil which is not easy to decompose in the oily sludge can permeate and diffuse, and serious pollution is caused to surrounding soil, water and air.
In recent years, with the improvement of the requirements of national environmental regulations, the environmental law enforcement is increasing, and the pollution control and resource utilization of solid waste generated in the production process become important problems in the petroleum industry. Oily sludge has been listed as waste mineral oil (HW 08 family) in the national records of hazardous wastes, and related laws such as the national clean production promotion law and the solid waste environmental pollution prevention and control law also require that the oily sludge be subjected to harmless treatment.
Most of domestic petroleum refining enterprises have earlier construction time, laggard treatment technology and old equipment, accumulate a large amount of old mud, and various chemical components of the oil-containing sludge interact with each other for more than ten years or even decades, so that the components are more stable, and the emulsification of oil substances is more serious. The demulsifying and flocculating effects of the flocculating agent cationic polyacrylamide are not sufficient.
In the actual operation process of a three-phase or two-drum centrifuge, when the solid content in sludge is high to a certain degree or the demulsification flocculation effect is poor, the dewatering effect of the centrifuge is poor, which is mainly shown in that the liquid content of centrifugal mud is too high, and the centrifugal liquid contains a large amount of organic matters and is black. If the black liquid is directly injected into a water system for treatment, a large amount of normal sewage is polluted into black. At present, most of refining and chemical enterprises pump the black liquid into an oil separation tank and a flotation tank, but the oil separation and flotation cannot effectively treat the black water, so that water quality impact and vicious cycle are caused to biochemical units.
Disclosure of Invention
The invention aims to provide a system and a process for treating oily sludge in an oil refinery, which can ensure that the treated sludge and sewage reach environmental protection indexes and can recover fuel oil.
The technical scheme of the invention is as follows: an oil refinery oily sludge treatment system comprises a feeding reaction tank, wherein the output end of the feeding reaction tank is connected with a first-stage precipitation separation tank, the output end of the first-stage precipitation separation tank is connected with a solid-liquid separation dehydrator, the water phase separation liquid output end of the solid-liquid separation dehydrator is connected with a second-stage four-phase separation tank, the slag phase separation output end of the second-stage four-phase separation tank is connected with the first-stage precipitation separation tank, the oil phase separation output end of the second-stage four-phase separation tank is connected with a dirty oil aging separation tank, the water phase separation liquid output end of the second-stage four-phase separation tank is connected with a third-stage four-phase separation tank, the suspension separation output end of the second-stage four-phase separation tank is connected with a second-stage solid-liquid separator, the suspension separation output end and the slag phase separation output end of the third-stage four-phase separation tank are respectively connected with, and the separation liquid output end of the second-stage solid-liquid separator is connected with the third-stage four-phase separation tank.
Further, the feeding reaction tank comprises a round tank, a stirrer is arranged in the round tank, a feeding pipe is arranged on the side wall of the upper part of the round tank, and a discharging pipe is arranged at the bottom of the round tank; the primary sedimentation separation tank comprises a conical bottom round tank, a stirrer is arranged in the conical bottom round tank, a feeding pipe is arranged on the side wall of the upper part of the conical bottom round tank, and a discharging pipe is arranged at the bottom of the conical bottom round tank; and heating equipment is respectively arranged in the feeding reaction tank and the primary precipitation separation tank.
Further, second grade four-phase separator and tertiary four-phase separator include the shell respectively, be provided with the dross collecting vessel that bottom and shell are linked together in the shell, the dross collecting vessel is linked together through setting up in its inside distributing device and feed inlet, and the upper end and the dross collector of dross collecting vessel are linked together, dross collector's upper portion intercommunication dross is arranged mouthful, lower part intercommunication oil drain port, the bottom intercommunication row's of shell cinder notch, top intercommunication outlet.
Further, the distributing device includes the vertical inlet pipe that sets up in the dross collecting vessel and be linked together with the feed inlet, the upper portion periphery of inlet pipe be provided with the dross collecting vessel inner wall between form the first cone top in first circulation clearance, be located the inlet pipe top and be provided with the second cone top, form the second circulation clearance between second cone top and the first cone top.
Further, the bottom of shell is provided with the sediment pipeline of arranging that the cinder notch is linked together, the dross collector set up in the upper portion periphery of dross collecting vessel and with form dross discharge chamber between the dross collecting vessel, the dross is arranged the mouth and is set up in the upper portion of dross collector and wears out the shell, the oil drain port is provided with the lower part of dross collector and wears out the shell, the upper end of dross collector still is provided with water drainage pipe, water drainage pipe is linked together through the overflow launder that sets up in the shell top and outlet.
Further, the dirty oil aging separation tank comprises a round tank, a feeding pipe is arranged on the side wall of the upper portion of the round tank, an external discharge separated oil output end is arranged at the bottom of the round tank, and a heating coil is arranged on the round tank; and heating equipment is respectively arranged in the second-stage four-phase separation tank and the third-stage four-phase separation tank.
Further, an output end of discharged dehydrated dry mud is respectively arranged on the solid-liquid separation dehydrator and the secondary solid-liquid separator; the solid-liquid separation dehydrator and the secondary solid-liquid separator are centrifuges, plate-and-frame filter presses, belt filter presses, screw stacking machines or screw stringing machines.
A process for treating oil-containing sludge in a refinery comprises a treatment system of the oil-containing sludge in the refinery, and comprises the following steps:
(1) diluting the refined oil sludge or refined scum to more than 95% of water content for treatment, pumping the material to be treated into a feeding reaction tank, adding a composite flocculant into the feeding reaction tank, and quickly stirring to fully mix the agent and the material;
(2) feeding the mixed materials into a primary precipitation separation tank for further reaction, and feeding a slag-water mixture discharged from the primary precipitation separation tank into a solid-liquid separation dehydrator; carrying out thermal desorption treatment on dry mud discharged by the solid-liquid separation dehydrator, and enabling discharged liquid to enter a second-stage four-item separation tank for static separation;
(3) returning the residue phase separated matter of the second four-phase separation tank to the first precipitation separation tank for treatment, discharging the oil phase separated liquid produced by the second four-phase separation tank to a sump oil time-effect tank for storage, sending the suspended matter separated liquid into a second solid-liquid separator for dehydration, and sending the water phase separated liquid into a third four-phase separation tank for static separation;
(4) carrying out thermal desorption treatment on dry mud discharged by the secondary solid-liquid separator, and sending the discharged liquid into a third-stage four-phase separation tank for static separation;
(5) and returning the suspension separators and the slag phase separators of the three-stage four-phase separation tank to the first-stage precipitation separation tank for treatment, discharging the oil phase separation liquid of the three-stage four-phase separation tank to a sump oil time-effect tank for storage, and discharging the water phase separation liquid of the three-stage four-phase separation tank according with an external discharge index.
Further, the temperature of the feeding reaction tank, the primary precipitation separation tank, the secondary four-phase separation pipe, the tertiary four-phase separation tank and the dirty oil aging separation tank is kept at 60 +/-5 ℃.
Further, the composite flocculant is an RJ2 type high-efficiency composite flocculant.
Compared with the prior art, the invention has the following advantages:
the system solves the problems of high sludge liquid content of a centrifuge, high organic matter content of centrifugal water, black color, impact on a production unit and vicious circle of the production unit in the traditional conditioning-centrifuging treatment process of oily sludge.
The system adds the novel composite carrier flocculant in the reaction stage, carries out solid-liquid separation through two-stage equipment, and the oil content of the separated dry sludge can reach below 5%, and the water content is not higher than 65%, so that the system accords with the feeding process parameters of the subsequent thermal desorption treatment of the dry sludge, can ensure that the treated sludge and sewage reach the environmental protection index, can recover fuel oil, saves the hazardous waste treatment cost for enterprises, and solves the defects of the original treatment process.
Drawings
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a schematic diagram of the feed reactor tank of the present invention;
FIG. 3 is a schematic structural view of a primary precipitation separation tank of the present invention;
FIG. 4 is a schematic structural diagram of a two-stage four-phase separation tank or a three-stage four-phase separation tank according to the present invention;
FIG. 5 is a schematic structural diagram of a sump oil aging separation tank of the present invention;
in the figure: 10-feed reaction tank 11-stirrer 12-feed pipe 13-discharge pipe 20-first-stage precipitation separation tank 21-stirrer 22-feed pipe 23-discharge pipe 30-dirty oil aging separation tank 31-feed pipe 32-discharge separated oil output end 33-heating coil 40-second-stage four-phase separation tank 41-shell 411-slag discharge pipe 42-scum collection barrel 43-distributor 431-feed pipe 432-first flow gap 433-first cone top 434-second cone top 435-second flow gap 44-scum collector 441-static flow plate 442-drainage pipe 443-overflow trough 45-scum discharge port 46-oil discharge port 47-scum discharge port 48-drainage port 49-feed inlet 50-third-fourth-stage four-phase And (4) a phase separation tank.
Detailed Description
In order to make the aforementioned features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below, but the present invention is not limited thereto.
Refer to fig. 1 to 5
An oil refinery oily sludge treatment system comprises a feeding reaction tank 10, the output end of the feeding reaction tank is connected with a primary precipitation separation tank 20, the output end of the first-stage precipitation separation tank is connected with a solid-liquid separation dehydrator, the water phase separation liquid output end of the solid-liquid separation dehydrator is connected with a second-stage four-phase separation tank 40, the output end of the slag phase separator of the second-stage four-phase separation tank is connected with the first-stage precipitation separation tank, the output end of the oil phase separator of the second-stage four-phase separation tank is connected with a dirty oil aging separation tank 30, the output end of the water phase separator of the second-stage four-phase separation tank is connected with a third-stage four-phase separation tank 50, the output end of the suspended separator of the second-stage four-phase separation tank is connected with a second-stage solid-liquid separator, the suspension separator output end and the slag phase separator output end of the three-stage four-phase separation tank are respectively connected with the primary precipitation separation tank, and the oil phase separation liquid output end of the three-stage four-phase separation tank is connected with the dirty oil aging separation tank; and the separation liquid output end of the secondary solid-liquid separator is connected with the third-stage four-phase separation tank so as to convey the squeezed liquid into the third-stage four-phase separation tank for continuous separation.
In the embodiment, the feeding reaction tank comprises a round tank, a stirrer 11 is arranged in the round tank, a feeding pipe 12 is arranged on the side wall of the upper part of the round tank, and a discharging pipe 13 is arranged at the bottom of the round tank; the primary sedimentation separation tank comprises a conical bottom round tank, a stirrer 21 is arranged in the conical bottom round tank, a feeding pipe 22 is arranged on the side wall of the upper part of the conical bottom round tank, and a discharging pipe 23 is arranged at the bottom of the conical bottom round tank; heating equipment is further arranged in the feeding reaction tank and the primary precipitation separation tank respectively, so that the temperatures of the feeding reaction tank and the primary precipitation separation tank are controlled when the device is used, and the set temperature of the materials is kept.
In this embodiment, the two-stage four-phase separation tank and the three-stage four-phase separation tank each include a housing 41, a scum collecting barrel 42 whose bottom end is communicated with the housing is provided in the housing, the scum collecting barrel is communicated with a feed port 49 via a distributor 43 provided in the scum collecting barrel, the upper end of the scum collecting barrel is communicated with a scum collector 44, and the upper part of the scum collector is communicated with a scum discharge port 45 so as to discharge suspended separators; the lower part of the scum collector is communicated with an oil outlet 46 so as to discharge oil phase separated substances; the bottom of the shell is communicated with a slag discharge port 47 so as to discharge slag-phase separated substances, and the top end of the shell is communicated with a water discharge port 48 so as to discharge water-phase separated liquid.
In this embodiment, the distributor includes a feeding pipe 431 vertically disposed in the dross collecting barrel and communicated with the feeding hole, a first cone top 433 is disposed on the periphery of the upper portion of the feeding pipe, a first flowing gap 432 is formed between the first cone top and the inner wall of the dross collecting barrel, a second cone top 434 is disposed above the feeding pipe, and a second flowing gap 435 is formed between the second cone top and the first cone top, so as to feed the material into the dross collecting barrel.
In this embodiment, in order to discharge the sediments, a slag discharge pipeline 411 communicated with the slag discharge port is arranged at the bottom of the housing, and a feeding end of the slag discharge pipeline is fixedly connected with the bottom plate of the housing and is provided with a plurality of discharge inlets.
In this embodiment, the dross collector is disposed at the periphery of the upper portion of the dross collecting barrel to form a dross discharging chamber with the dross collecting barrel, and a static flow plate 441 is disposed between the outer wall of the dross collector and the inner wall of the housing at an interval from top to bottom, and the static flow plate is disposed with its free end facing downward in a left-right staggered manner so as to gradually precipitate dross. The scum discharge port is arranged at the upper part of the scum collector and penetrates out of the shell, the oil discharge port is provided with the lower part of the scum collector and penetrates out of the shell, the upper end of the scum collector is also provided with a drainage pipeline 442, and the drainage pipeline is communicated with a water discharge port through an overflow groove 443 arranged at the top of the shell, so that scum, oil and water are separated through the cooperation of the scum collector and the shell.
In the embodiment, the dirty oil aging separation tank comprises a round tank, wherein a feeding pipe 31 is arranged on the side wall of the upper part of the round tank, an external discharge separated oil output end 32 is arranged at the bottom of the round tank, and a heating coil 33 is arranged on the round tank; heating equipment is respectively arranged in the second-stage four-phase separation tank and the third-stage four-phase separation tank, so that the temperature of the second-stage four-phase separation tank and the temperature of the third-stage four-phase separation tank are controlled during use, the set temperature of materials is kept, and the separation effect is improved.
In this embodiment, the solid-liquid separation dehydrator and the secondary solid-liquid separator are respectively provided with an output end for discharging dehydrated dry sludge, so as to discharge the squeezed dry sludge.
In this embodiment, the solid-liquid separation dehydrator and the secondary solid-liquid separator are centrifuges, plate-and-frame filter presses, belt filter presses, screw stacking machines or screw stringing machines.
A process for treating oil-containing sludge in a refinery comprises a treatment system of the oil-containing sludge in the refinery, and comprises the following steps:
(1) when the concentration of raw materials such as refined oil sludge or refined scum is high, an external container is needed, the raw materials are diluted to more than 95% of water content for treatment, the materials to be treated are pumped into a feeding reaction tank, a composite flocculating agent is added into the feeding reaction tank, and the raw materials are quickly stirred to fully mix the agent and the materials;
(2) feeding the mixed materials into a primary precipitation separation tank for further reaction, and feeding a slag-water mixture discharged from the primary precipitation separation tank into a solid-liquid separation dehydrator; carrying out thermal desorption treatment on dry mud discharged by the solid-liquid separation dehydrator, and enabling discharged liquid to enter a second-stage four-item separation tank for static separation;
(3) returning the residue phase separated matter of the second four-phase separation tank to the first precipitation separation tank for treatment, discharging the oil phase separated liquid produced by the second four-phase separation tank to a sump oil time-effect tank for storage, sending the suspended matter separated liquid into a second solid-liquid separator for dehydration, and sending the water phase separated liquid into a third four-phase separation tank for static separation;
(4) carrying out thermal desorption treatment on dry mud discharged by the secondary solid-liquid separator, and sending the discharged liquid into a third-stage four-phase separation tank for static separation;
(5) and returning the suspension separators and the slag phase separators of the three-stage four-phase separation tank to the first-stage precipitation separation tank for treatment, discharging the oil phase separation liquid of the three-stage four-phase separation tank to a sump oil time-effect tank for storage, and discharging the water phase separation liquid of the three-stage four-phase separation tank according with an external discharge index.
In the embodiment, the temperatures of the feeding reaction tank, the primary precipitation separation tank, the secondary four-phase separation pipe, the tertiary four-phase separation tank and the dirty oil aging separation tank are kept at 60 +/-5 ℃, so that the separation effect is improved.
In this embodiment, the composite flocculant is an RJ2 type high-efficiency composite flocculant so as to improve the flocculation effect.
By heating and adding the special composite flocculant, the oil content of the solid-liquid separation dehydrator and the dehydrated dry sludge can reach below 5%, the water content is not higher than 65%, and the feeding process parameters of the subsequent thermal desorption treatment of the dry sludge are met.
It will be apparent to those skilled in the art that various modifications, changes, substitutions and alterations can be made without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. An oil refinery oily sludge treatment system comprises a feeding reaction tank and is characterized in that the output end of the feeding reaction tank is connected with a primary precipitation separation tank, the output end of the primary precipitation separation tank is connected with a solid-liquid separation dehydrator, the water phase separation liquid output end of the solid-liquid separation dehydrator is connected with a secondary four-phase separation tank, the slag phase separation liquid output end of the secondary four-phase separation tank is connected with the primary precipitation separation tank, the oil phase separation liquid output end of the secondary four-phase separation tank is connected with a dirty oil aging separation tank, the water phase separation liquid output end of the secondary four-phase separation tank is connected with a tertiary four-phase separation tank, the suspension separation liquid output end of the secondary four-phase separation tank is connected with a secondary solid-liquid separator, the suspension separation liquid output end and the slag phase separation liquid output end of the tertiary four-phase separation tank are respectively connected with the, the oil phase separation liquid output end of the third-stage four-phase separation tank is connected with the dirty oil aging separation tank, and the separation liquid output end of the second-stage solid-liquid separator is connected with the third-stage four-phase separation tank.
2. The oil refinery oily sludge treatment system of claim 1, wherein the feeding reaction tank comprises a round tank, a stirrer is arranged in the round tank, the upper side wall of the round tank is provided with a feeding pipe, and the bottom of the round tank is provided with a discharging pipe; the primary sedimentation separation tank comprises a conical bottom round tank, a stirrer is arranged in the conical bottom round tank, a feeding pipe is arranged on the side wall of the upper part of the conical bottom round tank, and a discharging pipe is arranged at the bottom of the conical bottom round tank; and heating equipment is respectively arranged in the feeding reaction tank and the primary precipitation separation tank.
3. The oil-containing sludge treatment system of oil refinery according to claim 1 or 2, wherein the second-stage four-phase separation tank and the third-stage four-phase separation tank each comprise a housing, a scum collecting barrel with a bottom end communicated with the housing is arranged in the housing, the scum collecting barrel is communicated with the feed inlet through a distributor arranged in the scum collecting barrel, the upper end of the scum collecting barrel is communicated with the scum collector, the upper part of the scum collector is communicated with the scum discharge port, the lower part of the scum collector is communicated with the oil discharge port, and the bottom of the housing is communicated with the scum discharge port and the top end of the housing is communicated with the water discharge port.
4. The oil refinery oily sludge treatment system of claim 3, wherein the distributor comprises a feeding pipe vertically arranged in the scum collecting barrel and communicated with the feeding port, a first cone top forming a first flow gap with the inner wall of the scum collecting barrel is arranged on the periphery of the upper part of the feeding pipe, a second cone top is arranged above the feeding pipe, and a second flow gap is formed between the second cone top and the first cone top.
5. The system of claim 3, wherein the bottom of the housing is provided with a slag discharge pipe connected to the slag discharge port, the dross collector is disposed at the periphery of the upper portion of the dross collector cylinder and forms a dross discharge chamber with the dross collector cylinder, the dross discharge port is disposed at the upper portion of the dross collector and extends out of the housing, the oil discharge port is provided with the lower portion of the dross collector and extends out of the housing, the upper end of the dross collector is further provided with a drain pipe, and the drain pipe is connected to the drain port through an overflow trough disposed at the top of the housing.
6. The oil refinery oily sludge treatment system according to claim 1, 2, 4 or 5, wherein the dirty oil aging separation tank comprises a round tank, the upper side wall of the round tank is provided with a feeding pipe, the bottom of the round tank is provided with an outward discharge separated oil output end, and the round tank is provided with a heating coil; and heating equipment is respectively arranged in the second-stage four-phase separation tank and the third-stage four-phase separation tank.
7. The oil refinery oily sludge treatment system according to claim 1, wherein the solid-liquid separation dehydrator and the secondary solid-liquid separator are respectively provided with an externally discharged dehydrated dry sludge output end; the solid-liquid separation dehydrator and the secondary solid-liquid separator are centrifuges, plate-and-frame filter presses, belt filter presses, screw stacking machines or screw stringing machines.
8. A process for treating oil-containing sludge in a refinery, which comprises the oil-containing sludge treatment system in the refinery of claim 1, 2, 4 or 5, and is characterized by comprising the following steps:
(1) diluting the refined oil sludge or refined scum to more than 95% of water content for treatment, pumping the material to be treated into a feeding reaction tank, adding a composite flocculant into the feeding reaction tank, and quickly stirring to fully mix the agent and the material;
(2) feeding the mixed materials into a primary precipitation separation tank for further reaction, and feeding a slag-water mixture discharged from the primary precipitation separation tank into a solid-liquid separation dehydrator; carrying out thermal desorption treatment on dry mud discharged by the solid-liquid separation dehydrator, and enabling discharged liquid to enter a second-stage four-item separation tank for static separation;
(3) returning the residue phase separated matter of the second four-phase separation tank to the first precipitation separation tank for treatment, discharging the oil phase separated liquid produced by the second four-phase separation tank to a sump oil time-effect tank for storage, sending the suspended matter separated liquid into a second solid-liquid separator for dehydration, and sending the water phase separated liquid into a third four-phase separation tank for static separation;
(4) carrying out thermal desorption treatment on dry mud discharged by the secondary solid-liquid separator, and sending the discharged liquid into a third-stage four-phase separation tank for static separation;
(5) and returning the suspension separators and the slag phase separators of the three-stage four-phase separation tank to the first-stage precipitation separation tank for treatment, discharging the oil phase separation liquid of the three-stage four-phase separation tank to a sump oil time-effect tank for storage, and discharging the water phase separation liquid of the three-stage four-phase separation tank according with an external discharge index.
9. The process of claim 8, wherein the temperatures of the feed reaction tank, the primary precipitation separation tank, the secondary four-phase separation pipe, the tertiary four-phase separation tank and the dirty oil aging separation tank are maintained at 60 +/-5 ℃.
10. The process of claim 8, wherein the composite flocculant is an RJ2 type high-efficiency composite flocculant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011505334.6A CN112390508A (en) | 2020-12-18 | 2020-12-18 | Oil refinery oily sludge treatment system and process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011505334.6A CN112390508A (en) | 2020-12-18 | 2020-12-18 | Oil refinery oily sludge treatment system and process |
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| Publication Number | Publication Date |
|---|---|
| CN112390508A true CN112390508A (en) | 2021-02-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011505334.6A Pending CN112390508A (en) | 2020-12-18 | 2020-12-18 | Oil refinery oily sludge treatment system and process |
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| CN (1) | CN112390508A (en) |
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2020
- 2020-12-18 CN CN202011505334.6A patent/CN112390508A/en active Pending
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