CN111908767A - Oil refinery three-sludge treatment system and treatment process thereof - Google Patents
Oil refinery three-sludge treatment system and treatment process thereof Download PDFInfo
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- CN111908767A CN111908767A CN202010881754.8A CN202010881754A CN111908767A CN 111908767 A CN111908767 A CN 111908767A CN 202010881754 A CN202010881754 A CN 202010881754A CN 111908767 A CN111908767 A CN 111908767A
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
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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
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/125—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using screw filters
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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
- C02F11/127—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering by centrifugation
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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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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
- C02F2201/007—Modular design
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Abstract
The invention relates to a three-sludge treatment system of an oil refinery and a treatment process thereof, and the three-sludge treatment system comprises a pretreatment tank, a drum centrifuge, a relay tank and a skid-mounted module, wherein the pretreatment tank is provided with a pretreatment tank inlet, a pretreatment tank water outlet and a pretreatment tank slag discharge port; the drum centrifuge is provided with a drum centrifuge inlet and a drum centrifuge water outlet; the relay slot is provided with a relay slot inlet and a relay slot outlet; the slag discharge port of the pretreatment tank is connected with the inlet of the rotary drum centrifuge through a first pipeline, the water discharge port of the rotary drum centrifuge is connected with the inlet of the relay tank through a second pipeline, and the outlet of the relay tank is connected with the input end of the skid-mounted module through a third pipeline. The invention has reasonable design, can ensure that the treated sludge and sewage reach the environmental protection index, can recover fuel oil, saves the treatment cost of hazardous waste for enterprises, solves the defects of the traditional treatment process, and simultaneously saves the time cost and the financial cost of infrastructure construction by adopting skid-mounted module equipment.
Description
The technical field is as follows:
the invention belongs to the field of treatment of pollutants in an oil refinery, and particularly relates to a three-sludge treatment system and a treatment process for the oil refinery.
Background art:
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 compositions of the oil-containing sludge are interacted for more than ten years or even decades, so that the compositions are more stable, the emulsification of oil substances is more serious, and the demulsification and flocculation effects of the cationic polyacrylamide serving as the flocculant are insufficient.
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.
The invention content is as follows:
the invention aims to solve the problems in the prior art, namely, the invention provides a three-sludge treatment system for an oil refinery and a treatment process thereof, which are reasonable in design and can ensure that treated sludge and sewage reach environmental protection indexes.
In order to achieve the purpose, the invention adopts the technical scheme that: a three-sludge treatment system for an oil refinery comprises a pretreatment tank, a rotary drum centrifuge, a relay tank and a skid-mounted module, wherein the pretreatment tank is provided with a pretreatment tank inlet, a pretreatment tank water outlet and a pretreatment tank slag outlet; the drum centrifuge is provided with a drum centrifuge inlet and a drum centrifuge water outlet; the relay slot is provided with a relay slot inlet and a relay slot outlet; the slag discharge port of the pretreatment tank is connected with the inlet of the rotary drum centrifuge through a first pipeline, the water discharge port of the rotary drum centrifuge is connected with the inlet of the relay tank through a second pipeline, and the outlet of the relay tank is connected with the input end of the skid-mounted module through a third pipeline.
Further, the skid-mounted module comprises a reaction tank, a screw stacking machine, an inclined plate settling tank and an oil-water separator, wherein the reaction tank is provided with a reaction tank inlet and a reaction tank outlet; the screw stacking machine is provided with a screw stacking machine inlet, a screw stacking machine water outlet and a screw stacking machine oil outlet; the inclined plate settling tank is provided with an inclined plate settling tank inlet and an inclined plate settling tank slag discharge port; the oil-water separator is provided with an oil-water separator inlet and an oil-water separator water outlet; the inlet of the reaction tank is connected with the outlet of the relay tank through a third pipeline; the reaction tank outlet is connected with the inlet of the screw stacking machine through a fourth pipeline, the water outlet of the screw stacking machine is connected with the inlet of the inclined plate settling tank through a fifth pipeline, the slag discharge port of the inclined plate settling tank is connected with the inlet of the relay tank through a seventh pipeline, the oil discharge port of the screw stacking machine is connected with the inlet of the oil-water separator through a sixth pipeline, and the water outlet of the oil-water separator is connected with the inlet of the relay tank through an eighth pipeline and a seventh pipeline.
Furthermore, a first reaction chamber and a second reaction chamber which are communicated with each other are arranged in the reaction tank, a reaction tank feeder for adding the composite carrier flocculant is arranged at the top of the first reaction chamber, and a first reaction tank stirrer is arranged in the first reaction chamber; and a second reaction tank stirrer is arranged in the second reaction chamber.
Further, the rotary drum centrifuge is also provided with a rotary drum centrifuge slag discharge port; the screw stacking machine is also provided with a mud outlet of the screw stacking machine; the inclined plate settling tank is also provided with an inclined plate settling tank water outlet; the oil-water separator is also provided with an oil discharge port of the oil-water separator.
Furthermore, the relay slot inlet comprises a first relay slot inlet and a second relay slot inlet which are sequentially arranged from top to bottom, and the first relay slot inlet is connected with the second pipeline; and the inlet of the second relay groove is connected with a seventh pipeline.
Further, the pretreatment tank outlet comprises a first pretreatment tank outlet, a second pretreatment tank outlet and a third pretreatment tank outlet which are sequentially arranged from top to bottom.
Furthermore, a pretreatment tank feeder for adding the composite carrier flocculant is arranged at the top of the pretreatment tank, and a pretreatment tank stirrer is arranged in the pretreatment tank.
Further, the pretreatment tank and the relay tank are both provided with two.
The other technical scheme adopted by the invention is as follows: a three-sludge treatment process for an oil refinery comprises the following steps:
step S1: oily sludge enters the pretreatment tank through an inlet of the pretreatment tank to a specified liquid level, a pretreatment tank stirrer is started, the rotation speed is adjusted to 240-280r/min, the oily sludge is stirred, and a pretreatment tank feeder is started to add a No. 1 composite carrier flocculant into the pretreatment tank; when the medicine dose reaches a specified value, closing the feeding machine of the pretreatment tank, adjusting the rotating speed of the stirrer of the pretreatment tank to 80-100r/min, continuing stirring the oily sludge for 15-20min, closing the stirrer of the pretreatment tank, and standing for about 2-3 h;
step S2: the water separated by the pretreatment tank is discharged to a sewage treatment plant through a first pretreatment tank water outlet, a second pretreatment tank water outlet and a third pretreatment tank water outlet which are different in height, and the rest materials enter a rotary drum centrifuge through a pretreatment tank slag outlet, a first pipeline and a rotary drum centrifuge inlet to be subjected to solid-liquid separation;
step S3: in the drum centrifuge, separation slag is discharged through a slag discharge port of the drum centrifuge, separation liquid enters a relay tank through a water discharge port of the drum centrifuge, a second pipeline and a first relay tank inlet to be buffered and stored, relay tank separation water is discharged to a sewage treatment plant through a relay tank water discharge port, and residual materials enter a reaction tank through a relay tank outlet, a third pipeline and a reaction tank inlet;
step S4: starting a first reaction tank stirrer, adjusting the rotating speed to 240-280r/min, starting a second reaction tank stirrer, adjusting the rotating speed to 80-100r/min, starting a reaction tank feeder, adding a No. 2 composite carrier flocculant, performing emulsion breaking flocculation to form alum floc, and allowing the materials to enter a spiral shell stacking machine through a reaction tank outlet, a fourth pipeline and a spiral shell stacking machine inlet for solid-liquid separation;
step S5: in the screw stacking machine, separated slag is discharged from a mud discharge port of the screw stacking machine, separated water enters an inclined plate sedimentation tank through a water discharge port of the screw stacking machine, a fifth pipeline and an inlet of the inclined plate sedimentation tank, qualified water separated out by the inclined plate sedimentation tank is discharged to a sewage treatment plant through the water discharge port of the inclined plate sedimentation tank through the sedimentation effect, and precipitated slag enters a relay tank through the slag discharge port of the inclined plate sedimentation tank, a seventh pipeline and the inlet of the second relay tank for circular treatment;
step S6: the separation oil of the screw stacking machine enters the oil-water separator through the oil discharge port of the screw stacking machine, the sixth pipeline and the inlet of the oil-water separator, the oil-water separator is used for oil purification, the purified oil is discharged and collected through the oil discharge port of the oil-water separator, and the separation water enters the relay tank for circulation treatment through the water discharge port of the oil-water separator and connected with the inlet of the second relay tank through the eighth pipeline and the seventh pipeline.
Compared with the prior art, the invention has the following effects: the invention has reasonable design, can ensure that the treated sludge and sewage reach the environmental protection index, can recover fuel oil, saves the treatment cost of hazardous waste for enterprises, solves the defects of the traditional treatment process, and simultaneously saves the time cost and the financial cost of infrastructure construction by adopting skid-mounted module equipment.
Description of the drawings:
FIG. 1 is a schematic configuration diagram of an embodiment of the present invention.
In the figure:
1-a pretreatment tank; 101-pretreatment tank inlet; 102-a first pretreatment tank drain; 103-a second pretreatment tank drain outlet; 104-a third pretreatment tank drain; 105-a pretreatment tank agitator; 106-a slag discharge port of the pretreatment tank; 107-pretreatment tank feeder; 2-a drum centrifuge; 201-inlet of drum centrifuge; 202-bowl centrifuge drain; 203-slag discharge port of a rotary drum centrifuge; 3-relay slot; 301-first relay slot entrance; 302-a second relay slot entrance; 303-relay tank outlet; 304-relay trough drain; 4-a reaction tank; 401-reaction tank inlet; 402-reaction tank outlet; 403-reaction tank feeder; 404-first reaction tank stirrer; 405-a second reaction tank stirrer; 5-stacking the snails; 501-an inlet of a stack snail machine; 502-sludge discharge port of the screw stacking machine; 503-water outlet of the snail stacking machine; 504-oil drain port of screw stacking machine; 6-an inclined plate settling tank; 601-inclined plate settling tank inlet; 602-slag discharge port of inclined plate settling tank; 603-sloping plate settling tank drain outlet; 7-oil water separator; 701-oil water separator inlet; 702-oil water separator oil drain; 703-water outlet of oil-water separator; 8-a first conduit; 9-a second conduit; 10-a third conduit; 11-a fourth conduit; 12-a fifth pipeline; 13-a sixth conduit; 14-a seventh conduit; 15-an eighth conduit; 16-skid module.
The specific implementation mode is as follows:
the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The invention relates to a three-sludge treatment system of an oil refinery, which is used for solving the problems of high sludge liquid content rate of a centrifugal machine, high organic matter content of centrifugal water, black color, impact on a production unit and vicious circle of the centrifugal water in the traditional oil-containing sludge treatment 'tempering-centrifugation' treatment process. As shown in figure 1, the three-mud treatment system of the oil refinery comprises a pretreatment tank 1, a rotary drum centrifuge 2, a relay tank 3 and a skid-mounted module 16, wherein the skid-mounted module 16 comprises a reaction tank 4, a screw stacking machine 5, an inclined plate settling tank 6 and an oil-water separator 7.
In this embodiment, the pretreatment tank 1 is provided with a pretreatment tank inlet 101, a first pretreatment tank drain 102, a second pretreatment tank drain 103, a third pretreatment tank drain 104, a pretreatment tank agitator 105, a pretreatment tank slag discharge 106, and a pretreatment tank feeder 107; the inlet 101 of the pretreatment tank is used for inputting oily sludge; the first pretreatment tank water outlet 102, the second pretreatment tank water outlet 103 and the third pretreatment tank water outlet 104 are arranged in sequence from top to bottom; the pretreatment tank stirrer 105 is arranged inside the pretreatment tank 1 and is used for stirring the oily sludge; the pretreatment tank feeder 107 is located at the top of the pretreatment tank and is used for adding the number 1 composite carrier flocculant (dust) into the pretreatment tank.
In this embodiment, the bowl centrifuge 2 is provided with a bowl centrifuge inlet 201, a bowl centrifuge water outlet 202 and a bowl centrifuge slag outlet 203; the rotary drum centrifuge is used for carrying out solid-liquid separation, the separation slag is discharged through a slag discharge port of the rotary drum centrifuge, and the separation liquid is discharged through a water discharge port of the rotary drum centrifuge.
In this embodiment, the relay tank 3 is used for collecting a centrifuge separation liquid, the relay tank 3 is provided with a first relay tank inlet 301, a second relay tank inlet 302, a relay tank outlet 303, and a relay tank drain 304, and the first relay tank inlet and the second relay tank inlet are sequentially arranged from top to bottom.
In this embodiment, the reaction tank 4 is provided with a reaction tank inlet 401, a reaction tank outlet 402, a reaction tank feeder 403, a first reaction tank stirrer 404 and a second reaction tank stirrer 405, a first reaction chamber and a second reaction chamber which are communicated with each other are arranged in the reaction tank, the reaction tank inlet 401 and the reaction tank outlet 402 are respectively connected with the first reaction chamber and the second reaction chamber, the reaction tank feeder 403 is arranged at the top of the first reaction chamber and is used for adding a composite carrier flocculant, and the first reaction tank stirrer 404 is arranged in the first reaction chamber; a second reaction tank stirrer 405 is provided in the second reaction chamber.
In this embodiment, the screw stacking machine 5 is provided with a screw stacking machine inlet 501, a screw stacking machine sludge discharge port 502, a screw stacking machine water discharge port 503 and a screw stacking machine oil discharge port 504.
In this embodiment, the inclined plate settling tank 6 is provided with an inclined plate settling tank inlet 601, an inclined plate settling tank slag discharge port 602, and an inclined plate settling tank water discharge port 603.
In this embodiment, the oil-water separator 7 includes an oil-water separator inlet 701, an oil-water separator drain port 702, and an oil-water separator drain port 703.
The pipeline connection of the treatment system is as follows: the pretreatment tank slag discharge port 106 is connected with the inlet 201 of the rotary drum centrifuge through a first pipeline 8, the water discharge port 202 of the rotary drum centrifuge is connected with the inlet 301 of a first relay tank through a second pipeline 9, the outlet 303 of the relay tank is connected with the inlet 401 of the reaction tank through a third pipeline 10, the outlet 402 of the reaction tank is connected with the inlet 501 of the screw stacking machine through a fourth pipeline 11, the water discharge port 503 of the screw stacking machine is connected with the inlet 601 of the inclined plate sedimentation tank through a fifth pipeline 12, the slag discharge port 602 of the inclined plate sedimentation tank is connected with the inlet 302 of the second relay tank through a seventh pipeline 14, the oil discharge port 504 of the screw stacking machine is connected with the inlet 701 of the oil-water separator through a sixth pipeline 13, and the water discharge port 703 of the oil-water separator is connected with the inlet 302 of.
In this embodiment, the specific treatment process includes the following steps:
step S1: oily sludge enters a pretreatment tank 1 through a pretreatment tank inlet 101 to reach a specified liquid level, a pretreatment tank stirrer 105 is started, the rotation speed is adjusted to 240-; when the medicine dose reaches a specified value, closing the pre-treatment tank feeder 107, adjusting the rotating speed of the pre-treatment tank stirrer 105 to 80-100r/min, continuing to stir the oily sludge for 15-20min, closing the pre-treatment tank stirrer 105, standing for about 2-3h, realizing the separation of oil, water and mud, and discharging the once separated water;
step S2: the water separated from the pretreatment tank 1 is discharged to a sewage treatment plant through a first pretreatment tank water outlet 102, a second pretreatment tank water outlet 103 and a third pretreatment tank water outlet 104 which are different in height, and the rest materials enter the rotary drum centrifuge 2 through a pretreatment tank slag outlet 106, a first pipeline 8 and a rotary drum centrifuge inlet 201 to be subjected to solid-liquid separation;
step S3: in the rotary drum centrifuge 2, the separation slag is discharged through a rotary drum centrifuge slag discharge port 203, the separation liquid enters the relay tank 3 through a rotary drum centrifuge water discharge port 202, a second pipeline 9 and a first relay tank inlet 301 for buffer storage, the water separated by the relay tank 3 is discharged to a sewage treatment plant through a relay tank water discharge port 304, and the residual materials enter the reaction tank 4 through a relay tank outlet 303, a third pipeline 10 and a reaction tank inlet 401;
step S4: starting a first reaction tank stirrer 404 and regulating the rotating speed to 240-280r/min, starting a second reaction tank stirrer 402 and regulating the rotating speed to 80-100r/min, starting a reaction tank feeder 403 and adding a No. 2 composite carrier flocculant (powder), forming alum floc through demulsification and flocculation, and then enabling the materials to enter a screw lamination machine 5 through a reaction tank outlet 402, a fourth pipeline 11 and a screw lamination machine inlet 501 for solid-liquid separation;
step S5: in the screw stacking machine 5, separated slag is discharged through a screw stacking machine sludge discharge port 502, separated water enters the inclined plate settling tank 6 through a screw stacking machine water discharge port 503, a fifth pipeline 12 and an inclined plate settling tank inlet 601, qualified water separated by the inclined plate settling tank 6 is discharged to a sewage treatment plant through an inclined plate settling tank water discharge port 603 through the precipitation effect, and precipitated slag enters the relay tank 3 through an inclined plate settling tank slag discharge port 602, a seventh pipeline 14 and a second relay tank inlet 302 for circular treatment;
step S6: the separated oil of the screw overlapping machine 5 enters the oil-water separator 7 through the oil discharge port 504 of the screw overlapping machine, the sixth pipeline 13 and the oil-water separator inlet 701, the oil-water separator 7 is used for oil product purification, the purified oil is discharged and collected through the oil discharge port 702 of the oil-water separator, and the separated water enters the relay tank 3 for circulation treatment through the water discharge port 703 of the oil-water separator and is connected with the second relay tank inlet 302 through the eighth pipeline 15 and the seventh pipeline 14.
In the embodiment, 2 pretreatment tanks 1 and 2 relay tanks 3 can be respectively arranged in the production process for switching use, the volume is not less than 50% of daily throughput, the process flow can continuously run for 24 hours, and the process stability is ensured.
In this embodiment, the reaction tank 4, the screw stacking machine 5, the inclined plate settling tank 6 and the oil-water separator 7 included in the skid-mounted module 16 are skid-mounted modular integrated equipment. The water content of the sludge discharged from the slag discharge port 203 of the rotary drum centrifuge and the sludge discharge port 502 of the screw stacking machine is not higher than 75%. Wherein the indexes of the water discharged from the sewage treatment plant by the first pretreatment tank water discharge port 102, the second pretreatment tank water discharge port 103, the third pretreatment tank water discharge port 104, the inclined plate sedimentation tank water discharge port 603 and the relay tank water discharge port 304 are as follows: the pH value is 6-8, and the COD is not higher than 600 mg/L.
The invention has the advantages that: (1) in the original 'tempering-centrifuging' process, a pretreatment tank is added at the front end of a rotary drum centrifuge, a novel composite carrier flocculant is added, three-phase separation of oil, water and mud can be realized after flocculation reaction and standing, and once separated water is discharged; (2) solid-liquid separation is carried out through a drum centrifuge, so that the water content index of the centrifugal mud can be ensured; (3) collecting the centrifugate through a relay tank, performing advanced treatment by adopting skid-mounted modular equipment to ensure drainage indexes, and recovering fuel oil; (4) the invention can be transformed on the basis of the original process of petroleum refining enterprises, skid-mounted modular treatment equipment is introduced, three-phase separation of oil, water and sludge can be carried out, fuel oil can be recovered, the treated sludge and sewage can be ensured to reach environmental protection indexes, and great contribution is made to cost saving, energy saving and emission reduction of enterprises.
If the invention discloses or relates to parts or structures which are fixedly connected to each other, the fixedly connected parts can be understood as follows, unless otherwise stated: a detachable fixed connection (for example using bolts or screws) is also understood as: non-detachable fixed connections (e.g. riveting, welding), but of course, fixed connections to each other may also be replaced by one-piece structures (e.g. manufactured integrally using a casting process) (unless it is obviously impossible to use an integral forming process).
In addition, terms used in any technical solutions disclosed in the present invention to indicate positional relationships or shapes include approximate, similar or approximate states or shapes unless otherwise stated.
Any part provided by the invention can be assembled by a plurality of independent components or can be manufactured by an integral forming process.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.
Claims (9)
1. A three mud processing systems of oil refinery, its characterized in that: the device comprises a pretreatment tank, a rotary drum centrifuge, a relay tank and a skid-mounted module, wherein the pretreatment tank is provided with a pretreatment tank inlet, a pretreatment tank water outlet and a pretreatment tank slag outlet; the drum centrifuge is provided with a drum centrifuge inlet and a drum centrifuge water outlet; the relay slot is provided with a relay slot inlet and a relay slot outlet; the slag discharge port of the pretreatment tank is connected with the inlet of the rotary drum centrifuge through a first pipeline, the water discharge port of the rotary drum centrifuge is connected with the inlet of the relay tank through a second pipeline, and the outlet of the relay tank is connected with the input end of the skid-mounted module through a third pipeline.
2. The refinery three-mud treatment system of claim 1, wherein: the skid-mounted module comprises a reaction tank, a screw stacking machine, an inclined plate settling tank and an oil-water separator, wherein the reaction tank is provided with a reaction tank inlet and a reaction tank outlet; the screw stacking machine is provided with a screw stacking machine inlet, a screw stacking machine water outlet and a screw stacking machine oil outlet; the inclined plate settling tank is provided with an inclined plate settling tank inlet and an inclined plate settling tank slag discharge port; the oil-water separator is provided with an oil-water separator inlet and an oil-water separator water outlet; the inlet of the reaction tank is connected with the outlet of the relay tank through a third pipeline; the reaction tank outlet is connected with the inlet of the screw stacking machine through a fourth pipeline, the water outlet of the screw stacking machine is connected with the inlet of the inclined plate settling tank through a fifth pipeline, the slag discharge port of the inclined plate settling tank is connected with the inlet of the relay tank through a seventh pipeline, the oil discharge port of the screw stacking machine is connected with the inlet of the oil-water separator through a sixth pipeline, and the water outlet of the oil-water separator is connected with the inlet of the relay tank through an eighth pipeline and a seventh pipeline.
3. The refinery three-mud treatment system of claim 2, wherein: a first reaction chamber and a second reaction chamber which are communicated with each other are arranged in the reaction tank, a reaction tank feeder for adding the composite carrier flocculant is arranged at the top of the first reaction chamber, and a first reaction tank stirrer is arranged in the first reaction chamber; and a second reaction tank stirrer is arranged in the second reaction chamber.
4. The refinery three-mud treatment system of claim 2, wherein: the rotary drum centrifuge is also provided with a rotary drum centrifuge slag discharge port; the screw stacking machine is also provided with a mud outlet of the screw stacking machine; the inclined plate settling tank is also provided with an inclined plate settling tank water outlet; the oil-water separator is also provided with an oil discharge port of the oil-water separator.
5. The refinery three-mud treatment system of claim 2, wherein: the relay slot inlet comprises a first relay slot inlet and a second relay slot inlet which are sequentially arranged from top to bottom, and the first relay slot inlet is connected with the second pipeline; and the inlet of the second relay groove is connected with a seventh pipeline.
6. The refinery three-mud treatment system of claim 1, wherein: the pretreatment tank water outlet comprises a first pretreatment tank water outlet, a second pretreatment tank water outlet and a third pretreatment tank water outlet which are sequentially arranged from top to bottom.
7. The refinery three-mud treatment system of claim 1, wherein: the top of pretreatment tank is equipped with the pretreatment tank feeder that is used for adding composite carrier flocculating agent, is equipped with the pretreatment tank agitator in the pretreatment tank.
8. The refinery three-mud treatment system of claim 1, wherein: the pretreatment tank and the relay tank are both provided with two.
9. A three-sludge treatment process for an oil refinery is characterized by comprising the following steps: the method comprises the steps of adopting the oil refinery three-mud treatment system as set forth in any one of claims 1-8, and the treatment process comprises the following steps:
step S1: oily sludge enters the pretreatment tank through an inlet of the pretreatment tank to a specified liquid level, a pretreatment tank stirrer is started, the rotation speed is adjusted to 240-280r/min, the oily sludge is stirred, and a pretreatment tank feeder is started to add a No. 1 composite carrier flocculant into the pretreatment tank; when the medicine dose reaches a specified value, closing the feeding machine of the pretreatment tank, adjusting the rotating speed of the stirrer of the pretreatment tank to 80-100r/min, continuing stirring the oily sludge for 15-20min, closing the stirrer of the pretreatment tank, and standing for about 2-3 h;
step S2: the water separated by the pretreatment tank is discharged to a sewage treatment plant through a first pretreatment tank water outlet, a second pretreatment tank water outlet and a third pretreatment tank water outlet which are different in height, and the rest materials enter a rotary drum centrifuge through a pretreatment tank slag outlet, a first pipeline and a rotary drum centrifuge inlet to be subjected to solid-liquid separation;
step S3: in the drum centrifuge, separation slag is discharged through a slag discharge port of the drum centrifuge, separation liquid enters a relay tank through a water discharge port of the drum centrifuge, a second pipeline and a first relay tank inlet to be buffered and stored, relay tank separation water is discharged to a sewage treatment plant through a relay tank water discharge port, and residual materials enter a reaction tank through a relay tank outlet, a third pipeline and a reaction tank inlet;
step S4: starting a first reaction tank stirrer, adjusting the rotating speed to 240-280r/min, starting a second reaction tank stirrer, adjusting the rotating speed to 80-100r/min, starting a reaction tank feeder, adding a No. 2 composite carrier flocculant, performing emulsion breaking flocculation to form alum floc, and allowing the materials to enter a spiral shell stacking machine through a reaction tank outlet, a fourth pipeline and a spiral shell stacking machine inlet for solid-liquid separation;
step S5: in the screw stacking machine, separated slag is discharged from a mud discharge port of the screw stacking machine, separated water enters an inclined plate sedimentation tank through a water discharge port of the screw stacking machine, a fifth pipeline and an inlet of the inclined plate sedimentation tank, qualified water separated out by the inclined plate sedimentation tank is discharged to a sewage treatment plant through the water discharge port of the inclined plate sedimentation tank through the sedimentation effect, and precipitated slag enters a relay tank through the slag discharge port of the inclined plate sedimentation tank, a seventh pipeline and the inlet of the second relay tank for circular treatment;
step S6: the separation oil of the screw stacking machine enters the oil-water separator through the oil discharge port of the screw stacking machine, the sixth pipeline and the inlet of the oil-water separator, the oil-water separator is used for oil purification, the purified oil is discharged and collected through the oil discharge port of the oil-water separator, and the separation water enters the relay tank for circulation treatment through the water discharge port of the oil-water separator and connected with the inlet of the second relay tank through the eighth pipeline and the seventh pipeline.
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