CN112358093A - Oil refinery oily sewage treatment system and process - Google Patents
Oil refinery oily sewage treatment system and process Download PDFInfo
- Publication number
- CN112358093A CN112358093A CN202011422037.5A CN202011422037A CN112358093A CN 112358093 A CN112358093 A CN 112358093A CN 202011422037 A CN202011422037 A CN 202011422037A CN 112358093 A CN112358093 A CN 112358093A
- Authority
- CN
- China
- Prior art keywords
- phase separation
- tank
- separation tank
- liquid
- separated
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- 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
-
- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5281—Installations for water purification using chemical agents
-
- 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
- C02F2001/007—Processes including a sedimentation step
-
- 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)
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- 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 sewage in the oil refinery, which comprises a feeding reaction tank, wherein the output end of the feeding reaction tank is connected with a precipitation separation tank, the output end of the precipitation separation tank is connected with a four-phase separation tank A for treating water-phase separation liquid and a screw-stringing dehydrator for treating slag-phase separators, the four-phase separation tank A is connected with a four-phase separation tank C for treating water-phase separation liquid and oil-phase separation liquid, the screw-stringing dehydrator is connected with a four-phase separation tank B for treating water-phase separation liquid, the water-phase separation liquid output end and the oil-phase separation liquid output end of the four-phase separation tank B are respectively connected with the four-phase separation tank C, the four-phase separation tank A, the four-phase separation tank B and the four-phase separation tank C are respectively provided with slag-phase separator pipelines leading to, scum pipelines for returning scum to the feeding reaction tank for treatment are respectively arranged on the four-phase separation tank A and the four-phase separation tank B. The system and the process can ensure that the treated sludge and sewage reach the environmental protection index, can recover fuel oil and save cost.
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 sewage in the refinery.
Background
The oily sludge and scum of petroleum refining enterprises mainly come from oil separating tanks, flotation tanks, biochemical treatment tanks, crude oil dehydration tanks, oil storage tanks and sump oil tanks. 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.
In addition, the electro-desalting drainage, the electro-desalting backwash water and the crude oil dehydration of petroleum refining enterprises are influenced by the production period of an oil field, the water quality index has seasonal changes, the fluctuation range is large, the contents of COD (chemical oxygen demand), suspended matters and the like are high, the emulsification is serious, and the oil refining enterprises are particularly worse in summer; due to the existence of solid-phase particles with smaller particle size, a surfactant and the like, the sewage treatment device forms a stable emulsified state, does not have obvious layering after standing for a long time, and is difficult to demulsify and separate solid from liquid by adopting a conventional method and a medicament in a pretreatment facility of the existing sewage treatment device of a refinery enterprise. Effective pretreatment of the three streams of water is urgently needed to meet the water inlet requirement of a sewage treatment device and effectively reduce sludge.
Disclosure of Invention
The invention aims to provide a system and a process for treating oily sewage of an oil refinery, which can ensure that the treated sludge and sewage reach environmental protection indexes, can recover fuel oil, save the treatment cost of hazardous waste for enterprises and solve the defects of the original treatment process.
The technical scheme of the invention is as follows: an oily sewage treatment system of an oil refinery comprises a feeding reaction tank, wherein the output end of the feeding reaction tank is connected with a precipitation separation tank, the output end of the precipitation separation tank is connected with a four-phase separation tank A for treating water-phase separation liquid and a serial spiral dehydrator for treating slag-phase separators, the four-phase separation tank A is connected with a four-phase separation tank C for treating water phase separation liquid and oil phase separation liquid, the spiral shell water extractor is connected with a four-phase separation tank B for processing water phase separation liquid, the water phase separation liquid output end and the oil phase separation liquid output end of the four-phase separation tank B are respectively connected with a four-phase separation tank C, and the four-phase separation tank A, the four-phase separation tank B and the four-phase separation tank C are respectively provided with a slag-phase separator pipeline leading to the screw-stringing dehydrator, and the four-phase separation tank A and the four-phase separation tank B are respectively provided with a scum pipeline used for returning scum to the feeding reaction tank for treatment.
Furthermore, a separated water outer discharge pipe and a separated oil outer discharge pipe are arranged on the four-phase separation tank C, and a dehydrated dry sludge outer discharge pipe is further arranged on the screw dehydrator.
Further, feeding retort, precipitation knockout drum include a jar body respectively, one side upper portion of the jar body is provided with the output shaft slope and upwards stretches into the internal first agitator of jar, and the opposite side lower part of the jar body is provided with the output shaft slope and downwards stretches into the internal second agitator of jar.
Furthermore, an included angle between an output shaft of the first stirrer and the side wall of the tank body is 50-70 degrees, and stirring blades are arranged on the output shaft; the output shaft of second agitator and jar body lateral wall's contained angle be 50~70, and be provided with the stirring leaf on the output shaft.
Furthermore, the included angle between the output shaft of the first stirrer and the side wall of the tank body is 60 degrees; the output shaft of the second stirrer forms an included angle of 60 degrees with the side wall of the tank body.
A process for treating oily sewage of an oil refinery comprises a treatment system of the oily sewage of the oil refinery, and comprises the following steps:
(1) pumping a material to be treated into a feeding reaction tank, adding a medicament into the feeding reaction tank, and quickly stirring to fully mix the medicament and the material;
(2) sending the mixed materials into a precipitation separation tank for further reaction, after reaction and precipitation, sending water phase separation liquid into a four-phase separation tank A for continuous treatment, sending slag phase separation substances into a screw dewatering machine for solid-liquid separation, squeezing and discharging dry sludge;
(3) further separating the water phase separation liquid in a four-phase separation tank A, feeding the separated oil phase separation liquid and the separated water phase separation liquid into a four-phase separation tank C, feeding the separated floating slag into a feeding reaction tank for returning treatment, feeding the separated slag phase separation matter into a screw dewatering machine for solid-liquid separation, squeezing and discharging dry mud;
enabling water phase separation liquid discharged by the snail stringing dehydrator to enter a four-phase separation tank B, adding a medicament into the four-phase separation tank B, enabling separated oil phase separation liquid and separated water phase separation liquid to enter a four-phase separation tank C, enabling separated floating slag to enter a feeding reaction tank for returning treatment, enabling separated slag phase separation matters to enter the snail stringing dehydrator for solid-liquid separation, and squeezing and discharging dry mud;
(4) and (3) discharging separated oil and separated water separated out by the four-phase separation tank C respectively, feeding separated slag phase separated matter into a screw-connecting dehydrator for solid-liquid separation, squeezing and discharging dry sludge.
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. Meanwhile, the treatment process is effective for electro-desalting drainage, electro-desalting backwash water and crude oil dehydration which are influenced by the production period of the oil field, have seasonal changes in water quality indexes, have a large fluctuation range, have high contents of COD, suspended matters and the like, and are seriously emulsified.
The system and the process can ensure that the treated sludge and sewage reach the environmental protection index, can recover fuel oil, save the treatment cost of hazardous waste for enterprises, and solve the defects of the original treatment process.
Drawings
FIG. 1 is a process flow diagram of a treatment system and process for oily wastewater from an oil refinery according to the present invention;
FIG. 2 is a schematic view of the stirring structure of the feed reaction tank and the precipitation separation tank of the present invention;
in the figure: 10-tank 11-first stirrer 12-second stirrer 13-included angle 14-included angle.
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 FIGS. 1 and 2
An oily sewage treatment system of an oil refinery comprises a feeding reaction tank, wherein the output end of the feeding reaction tank is connected with a precipitation separation tank, the output end of the precipitation separation tank is connected with a four-phase separation tank A for treating water-phase separation liquid and a serial spiral dehydrator for treating slag-phase separators, the four-phase separation tank A is connected with a four-phase separation tank C for treating water phase separation liquid and oil phase separation liquid, the spiral shell water extractor is connected with a four-phase separation tank B for processing water phase separation liquid, the water phase separation liquid output end and the oil phase separation liquid output end of the four-phase separation tank B are respectively connected with a four-phase separation tank C, and the four-phase separation tank A, the four-phase separation tank B and the four-phase separation tank C are respectively provided with a slag-phase separator pipeline leading to the screw-stringing dehydrator, and the four-phase separation tank A and the four-phase separation tank B are respectively provided with a scum pipeline used for returning scum to the feeding reaction tank for treatment. The sewage treated by the oil-containing sewage treatment system of the oil refinery comprises oil-containing sludge, scum, electric desalted water, electric desalting backwash water and crude oil tank dehydration, and is particularly suitable for treating electric desalting comprehensive sewage.
In this embodiment, in order to improve the yield and the effect, a plurality of devices such as the feed reaction tank, the precipitation separation tank, the four-phase separation tank a, the four-phase separation tank B, the four-phase separation tank C, the tandem screw dehydrator and the like may be provided in series or in parallel.
In this embodiment, the four-phase separation tank C is provided with a separated water outer discharge pipe and a separated oil outer discharge pipe, and the screw dehydrator is further provided with a dehydrated dry sludge outer discharge pipe.
In this embodiment, feeding retort, precipitation tank include jar body 10 respectively, one side upper portion of jar body is provided with the output shaft slope and upwards stretches into jar internal first agitator 11, and the opposite side lower part of jar body is provided with the output shaft slope and downwards stretches into jar internal second agitator 12. The first stirrer and the second stirrer are respectively below the liquid level and are used for submersible thrust stirring.
In the embodiment, an included angle 13 between an output shaft of the first stirrer and the side wall of the tank body is 50-70 degrees, and stirring blades are arranged on the output shaft; an included angle 14 between an output shaft of the second stirrer and the side wall of the tank body is 50-70 degrees, and a stirring blade is arranged on the output shaft.
In this embodiment, in order to better stir the materials, an included angle between an output shaft of the first stirrer and a side wall of the tank body is 60 degrees; the output shaft of second agitator is 60 with jar body lateral wall's contained angle to make inside material present clockwise rotation's trend at the stirring operation in-process, make the stirring more abundant.
A process for treating oily sewage of an oil refinery comprises a treatment system of the oily sewage of the oil refinery, and comprises the following steps:
(1) pumping a material to be treated into a feeding reaction tank, adding a medicament into the feeding reaction tank, and quickly stirring to fully mix the medicament and the material;
(2) sending the mixed materials into a precipitation separation tank for further reaction, after reaction and precipitation, sending water phase separation liquid into a four-phase separation tank A for continuous treatment, sending slag phase separation substances into a screw dewatering machine for solid-liquid separation, squeezing and discharging dry sludge;
(3) further separating the water phase separation liquid in a four-phase separation tank A, feeding the separated oil phase separation liquid and the separated water phase separation liquid into a four-phase separation tank C, feeding the separated floating slag into a feeding reaction tank for returning treatment, feeding the separated slag phase separation matter into a screw dewatering machine for solid-liquid separation, squeezing and discharging dry mud;
enabling water phase separation liquid discharged by the snail stringing dehydrator to enter a four-phase separation tank B, adding a medicament into the four-phase separation tank B, enabling separated oil phase separation liquid and separated water phase separation liquid to enter a four-phase separation tank C, enabling separated floating slag to enter a feeding reaction tank for returning treatment, enabling separated slag phase separation matters to enter the snail stringing dehydrator for solid-liquid separation, and squeezing and discharging dry mud;
(4) and (3) discharging separated oil and separated water separated out by the four-phase separation tank C respectively, feeding separated slag phase separated matter into a screw-connecting dehydrator for solid-liquid separation, squeezing and discharging dry sludge.
The above description is only a preferred embodiment of the present invention, and it will be apparent to those skilled in the art that various types of oil refinery oily wastewater treatment systems and processes can be designed without inventive labor based on the teachings of the present invention, and all equivalent changes, modifications, substitutions and alterations made without departing from the spirit and scope of the present invention as defined by the appended claims should be construed as encompassing the present invention.
Claims (6)
1. An oil refinery oily sewage treatment system comprises a feeding reaction tank and is characterized in that the output end of the feeding reaction tank is connected with a precipitation separation tank, the output end of the precipitation separation tank is connected with a four-phase separation tank A for treating water-phase separation liquid and a serial spiral dehydrator for treating slag-phase separators, the four-phase separation tank A is connected with a four-phase separation tank C for treating water phase separation liquid and oil phase separation liquid, the spiral shell water extractor is connected with a four-phase separation tank B for processing water phase separation liquid, the water phase separation liquid output end and the oil phase separation liquid output end of the four-phase separation tank B are respectively connected with a four-phase separation tank C, and the four-phase separation tank A, the four-phase separation tank B and the four-phase separation tank C are respectively provided with a slag-phase separator pipeline leading to the screw-stringing dehydrator, and the four-phase separation tank A and the four-phase separation tank B are respectively provided with a scum pipeline used for returning scum to the feeding reaction tank for treatment.
2. The oily sewage treatment system of the oil refinery of claim 1, wherein the four-phase separation tank C is provided with an external discharge pipe for separated water and an external discharge pipe for separated oil, and the screw dehydrator is further provided with an external discharge pipe for dehydrated sludge.
3. The oil refinery oily sewage treatment system of claim 1 or 2, wherein the feeding reaction tank and the precipitation separation tank respectively comprise a tank body, a first stirrer with an output shaft obliquely and upwardly extending into the tank body is arranged at the upper part of one side of the tank body, and a second stirrer with an output shaft obliquely and downwardly extending into the tank body is arranged at the lower part of the other side of the tank body.
4. The oil refinery oily sewage treatment system of claim 3, wherein the angle between the output shaft of the first stirrer and the side wall of the tank body is 50-70 degrees, and the output shaft is provided with stirring blades; the output shaft of second agitator and jar body lateral wall's contained angle be 50~70, and be provided with the stirring leaf on the output shaft.
5. The oil refinery oily sewage treatment system of claim 4, wherein the angle between the output shaft of the first stirrer and the side wall of the tank body is 60 °; the output shaft of the second stirrer forms an included angle of 60 degrees with the side wall of the tank body.
6. A process for treating oily sewage of a refinery, which comprises the oily sewage treatment system of the refinery of claim 4 or 5, and is characterized by comprising the following steps:
(1) pumping a material to be treated into a feeding reaction tank, adding a medicament into the feeding reaction tank, and quickly stirring to fully mix the medicament and the material;
(2) sending the mixed materials into a precipitation separation tank for further reaction, after reaction and precipitation, sending water phase separation liquid into a four-phase separation tank A for continuous treatment, sending slag phase separation substances into a screw dewatering machine for solid-liquid separation, squeezing and discharging dry sludge;
(3) further separating the water phase separation liquid in a four-phase separation tank A, feeding the separated oil phase separation liquid and the separated water phase separation liquid into a four-phase separation tank C, feeding the separated floating slag into a feeding reaction tank for returning treatment, feeding the separated slag phase separation matter into a screw dewatering machine for solid-liquid separation, squeezing and discharging dry mud;
enabling water phase separation liquid discharged by the snail stringing dehydrator to enter a four-phase separation tank B, adding a medicament into the four-phase separation tank B, enabling separated oil phase separation liquid and separated water phase separation liquid to enter a four-phase separation tank C, enabling separated floating slag to enter a feeding reaction tank for returning treatment, enabling separated slag phase separation matters to enter the snail stringing dehydrator for solid-liquid separation, and squeezing and discharging dry mud;
(4) and (3) discharging separated oil and separated water separated out by the four-phase separation tank C respectively, feeding separated slag phase separated matter into a screw-connecting dehydrator for solid-liquid separation, squeezing and discharging dry sludge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011422037.5A CN112358093A (en) | 2020-12-08 | 2020-12-08 | Oil refinery oily sewage treatment system and process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011422037.5A CN112358093A (en) | 2020-12-08 | 2020-12-08 | Oil refinery oily sewage treatment system and process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112358093A true CN112358093A (en) | 2021-02-12 |
Family
ID=74536037
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011422037.5A Pending CN112358093A (en) | 2020-12-08 | 2020-12-08 | Oil refinery oily sewage treatment system and process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112358093A (en) |
-
2020
- 2020-12-08 CN CN202011422037.5A patent/CN112358093A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106007209B (en) | A kind of oil refinery's sewage oil removing pretreating process | |
| CN202594928U (en) | Ultrasonic solid-liquid separation skid | |
| CN102849880B (en) | Method for comprehensive treatment of oilfield waste | |
| CN106630514B (en) | Treatment system for oily sludge, separation equipment and treatment method thereof | |
| CN107879572B (en) | Treatment method of oily sludge | |
| CN109970295B (en) | Dirty oil sludge treatment equipment and process | |
| CN104649563A (en) | Oily sludge advanced treatment technology | |
| CN104556595B (en) | A kind for the treatment of process of oily sludge | |
| CN108203592B (en) | Crude oil desalting and dewatering equipment and application thereof | |
| CN104556624B (en) | A kind of greasy filth emulsion splitter and greasy filth advanced treatment process | |
| CN201320551Y (en) | Pollution-free oil-containing silt purification treatment system | |
| CN103880260A (en) | Conditioning process for oil-refining sludge with high viscosity and high oil content | |
| CN214299593U (en) | Oil refinery oily sewage treatment system | |
| CN111170551A (en) | Method and device for recovering oil in cleaning treatment of oily sewage | |
| CN212451147U (en) | Three mud processing systems of oil refinery | |
| CN112358093A (en) | Oil refinery oily sewage treatment system and process | |
| KR20090011279A (en) | Apparatus for separating oil from water | |
| CN210340641U (en) | Dirty oil sludge treatment facility | |
| CN214270658U (en) | Fatlute minimizing treatment device | |
| CN214299842U (en) | Oil refinery oil-containing sludge treatment system | |
| CN104418473A (en) | Oil-containing sludge resourceful treatment technology | |
| CN111892269A (en) | Oil sludge treatment system and method | |
| CN112390508A (en) | Oil refinery oily sludge treatment system and process | |
| CN111777313A (en) | Skid-mounted oily sludge treatment equipment | |
| CN112723698A (en) | Harmless treatment system and treatment process for tank cleaning oil sludge |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20221012 Address after: No. 600-1, Shenshui Road, Shenhe District, Shenyang, Liaoning 110065 Applicant after: Sun Haibin Address before: 102488 no.18-d15056, Jianshe Road, Kaixuan street, Liangxiang, Fangshan District, Beijing (cluster registration) Applicant before: Beijing Rongji environmental protection and energy saving Technology Co.,Ltd. |
|
| TA01 | Transfer of patent application right |