CN103755052A - Method and system for treating petroleum refining wastewater electro-desalting black liquor - Google Patents

Method and system for treating petroleum refining wastewater electro-desalting black liquor Download PDF

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Publication number
CN103755052A
CN103755052A CN201410038386.5A CN201410038386A CN103755052A CN 103755052 A CN103755052 A CN 103755052A CN 201410038386 A CN201410038386 A CN 201410038386A CN 103755052 A CN103755052 A CN 103755052A
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oil
water
strainer
black liquor
treatment
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CN201410038386.5A
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CN103755052B (en
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孙洪桥
杨欣燃
党威
吴昊
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XI'AN LANRUI MECHANICAL AND ELECTRICAL EQUIPMENT Co Ltd
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XI'AN LANRUI MECHANICAL AND ELECTRICAL EQUIPMENT Co Ltd
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Abstract

The invention discloses a method and a system for treating petroleum refining wastewater electro-desalting black liquor, and belongs to the technical field of chemical equipment. According to the technical scheme, the method comprises the following steps: delivering the electro-desalting black liquor to a homogenizing buffer tank for sedimentation treatment, collecting floating oil, pumping oily wastewater into a filter by using a water pump, and removing suspended matters until every liter of oily wastewater contains less than or equal to 5 micrograms of suspended matters; delivering the filtered wastewater to an oil-water separator, separating oil to a collection tank in the oil-water separator, and externally draining or delivering the effluent of the separator to other facilities, wherein every liter of effluent of the oil-water separator contains less than or equal to 10 micrograms of oil. The method is short in treatment time, high in treatment speed, free of secondary pollution, safe and effective; the system is simple in structure, easy to operate and convenient to maintain, can safely and reliably operate, and has good treatment effects, and secondary pollution can be eliminated.

Description

A kind for the treatment of process and system of oil refining Wastewater by Electric desalination black liquor
Technical field
The invention belongs to technical field of chemical, be specifically related to a kind for the treatment of process and system of oil refining Wastewater by Electric desalination black liquor.
Background technology
In recent years, the exploitation of most of oil field has entered high water-cut stage, enforcement along with oil field secondary, tertiary oil recovery technology, the continuous increase of oil field chemical consumption, cause crude oil retrogradation increasingly, become heavy, salts contg raises, emulsion is more serious, and the application of various production techniques makes crude oil be plucked out of mainly with the form of milk sap.The a large amount of polymer substances that add in Oil extraction process, tensio-active agent, emulsifying agent and other Oil Field Measure liquid enter in crude oil, cause oil composition complicated, and impurity increases, and crude quality declines.First Crude Oil Transportation passes through sedimentation to refinery in raw material is filled with, and will after the materials such as the partial impurities in crude oil, ageing oil, water and crude oil initial gross separation, enter electric desalting apparatus again.
General refinery adopts ultrasonic dehydration technology to carry out desalting and dewatering processing to crude oil more, and some refineries also adopt traditional dosing breakdown of emulsion to process crude oil.In this process, when crude oil tank switching or the poor crude oil of processing quality, the various chemical agents that complicated ingredient in crude oil adds as fracturing outlet liquid, ageing oil, impurity, oil field and the complicated ingredient of crude oil effect formation etc. enter electric desalting apparatus, cause electric desalting apparatus operation irregularity, with electric desalting, cut water with electric desalting water filling and discharge, form electric desalting black liquor.This black liquor causes serious harm to downstream Sewage treatment systems, can cause the paralysis of refinery's Sewage treatment systems when serious.
At present also do not have this black liquor of technical finesse reliable and applied widely, traditional dosing intermediate processing need be researched and developed specific or efficient medicament, and processing cost is high, and disengaging time is oversize, and treatment effect is unstable, and the mud producing, sump oil form secondary pollution.Take treatment facility that gravity settling or hydrocyclone be principle to the waste water containing mink cell focus, and particularly density is greater than 0.9 * 10 3kg/m 3mink cell focus water treatment effect extreme difference, disengaging time is long, practical application difficulty is very large.Also there is not the technical finesse electric desalting black liquor of certain refinery of report to filter.Feeling simply helpless to electric desalting black liquor at present in part refinery, with water in a large amount of, dilutes laggard Sewage treatment systems, causes Sewage treatment systems abnormal.
Summary of the invention
In order to overcome the defect of above-mentioned prior art existence, the object of the present invention is to provide a kind for the treatment of process and system of oil refining Wastewater by Electric desalination black liquor, the method treatment time is short, processing speed is fast, and non-secondary pollution is safe and effective; This system architecture is simple, processing ease, easy to maintenance, safe and reliable to operation, and treatment effect is good, can eliminate secondary pollution.
The present invention is achieved through the following technical solutions:
A treatment process for oil refining Wastewater by Electric desalination black liquor, comprises the following steps:
1) electric desalting black liquor is delivered in homogeneous snubber assembly, sedimentation was processed after 1~2 hour, the floating oil slick in liquid upper strata is delivered in floating oil collecting tank, the oily(waste)water of lower floor is pumped into the suspended particulate content being filtered in waste water in strainer by water pump and be less than or equal to 5mg/L;
Wherein, during filter operation, also comprise with clear water or air strainer is recoiled, obtain carrying the recoil water outlet of pollutent, this is carried to pollutent recoil water outlet is delivered in homogeneous snubber assembly by pipeline, mud after sedimentation is discharged by homogeneous snubber assembly bottom, and oily(waste)water continues to pump in strainer to filter;
2) waste water of removing suspended particulate is delivered in water-and-oil separator, isolates the oil in waste water, obtain oleaginousness and be less than or equal to purifying waste water of 10mg/L.
Also comprise the oil in isolated waste water is collected in storage tank, will purify waste water to collect reuse or be delivered to Sewage treatment systems and process.
The pressure of described water pump is set to 0.1~0.3MPa.
Described strainer recoil with clear water or air is the pressure difference value of setting according to strainer, by PLC system, automatically controls.
In described strainer, fill and there is the filter core that the modified fiber materials of hydrophilic oleophobic property is made.
A treatment system for oil refining Wastewater by Electric desalination black liquor, comprises the homogeneous snubber assembly with oil slick outlet, mud discharging mouth and liquid outlet, strainer and water-and-oil separator; The liquid outlet of homogeneous snubber assembly is connected with the fluid inlet of strainer by pipeline, and the oily(waste)water outlet of strainer is connected with the fluid inlet of water-and-oil separator by pipeline, is also provided with oil outlet and water port on water-and-oil separator; On the pipeline between homogeneous snubber assembly and strainer, be also provided with water pump; Described strainer is the automatic backwashing filter with PLC Controlling System, and this automatic backwashing filter is connected with homogeneous snubber assembly by drainage pipeline.
The oil outlet of described water-and-oil separator is connected with storage tank by pipeline.
The oil outlet place of described water-and-oil separator arranges automatic oil draining valve.
Described homogeneous snubber assembly is by the external floating oil collecting tank of pipeline.
Described homogeneous snubber assembly adopts perpendicular stream slurry tank, Horizontal sedimentation tank or buffering pond.
Compared with prior art, the present invention has following useful technique effect:
Oil refining Wastewater by Electric desalination black liquor treatment process of the present invention, compared with prior art:
1, disengaging time is short, and velocity of separation is fast, and filtration velocity can reach 3mm/s;
2, flow process is simple, applied widely, is particularly useful for the oily(waste)water containing mink cell focus, in sepn process, do not add any chemical agent, therefore do not change oil properties, can realize and reclaim to greatest extent and utilize, no coupling product or problem of secondary pollution in treating processes;
3, demulsification technology is advanced, adopts wetting coalescence principle with the oil in water emulsion in the direct separated water outlet of form of filtering, and isolated oil quality is good, precision is high, and water outlet oleaginousness is less than or equal to 10mg/L;
4, the present invention utilizes clear water or air to recoil to this strainer; recoil water outlet is carried pollutent and is again entered in homogeneous snubber assembly by pipeline; sedimentation again, separated rear discharge; thereby the present invention is without the recoil equipment such as recoil pond and recoil pump are set; and when operation, need not shut down, just can realize the backflush process to strainer; stable, capacity of resisting impact load is strong.
Further, during water pump operation, pressure is low, only needs 0.1~0.3Mpa, and the filtration resistance of system is little, energy-conservation, effective.
The treatment system of oil refining Wastewater by Electric desalination black liquor of the present invention, comprise by pipeline successively connected homogeneous snubber assembly, strainer and water-and-oil separator, homogeneous snubber assembly can regulating pondage, can allow in electric desalting black liquor simultaneously can floating upward quickly material, as part ageing oil, oil slick etc. float up on the water surface, by overflow, be isolated out homogeneous snubber assembly; The oily(waste)water of removing oil slick in homogeneous snubber assembly is pumped to strainer by water pump, and the operating pressure of water pump is low, only needs 0.1~0.3Mpa, and the filtration resistance of system is little, energy-conservation; The oily(waste)water that enters strainer is removed impurity, suspended substance and small part oily substance, makes suspension content≤5mg/L; Strainer of the present invention is automatic backwashing filter; recoil is controlled automatically by PLC system; when the pressure difference of strainer reaches set(ting)value; utilize clear water or air to recoil to this strainer, recoil water outlet is carried pollutent and is again entered in homogeneous snubber assembly by pipeline, sedimentation again, separated rear discharge; thereby the present invention is without the recoil equipment such as recoil pond and recoil pump are set; and when operation, need not shut down, just can realize the backflush process to strainer.Water after filtering enters water-and-oil separator again, sub-argument goes out oil in water emulsion, dispersed oil, makes final outflow water oil-contg≤10mg/L, and this system velocity of separation is fast, disengaging time is short, separation accuracy is high, and system floor space is little, simple to operate, reliable, easy to maintenance, the oil quality of separating by this system is high, and water content is low.
Accompanying drawing explanation
Fig. 1 is structured flowchart of the present invention.
Wherein: 1 is homogeneous snubber assembly; 2 is strainer; 3 is water-and-oil separator; 4 is filter storage tank; 5 is water pump; 6 is floating oil collecting tank.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail:
A treatment process for oil refining Wastewater by Electric desalination black liquor, comprises the following steps:
1) electric desalting black liquor is delivered in homogeneous snubber assembly, sedimentation was processed after 1~2 hour, and the floating oil slick in liquid upper strata is delivered in floating oil collecting tank, and by water pump, (pressure of water pump is set to 0.1~0.3MPa to the oily(waste)water of lower floor.) pump into the suspended particulate content being filtered in waste water in strainer and be less than or equal to 5mg/L; In described strainer, fill the filter core of the modified fiber materials manufacture with hydrophilic oleophobic property.
Wherein, during filter operation, also comprise with clear water or air strainer is recoiled, obtain carrying the recoil water outlet of greasy dirt, the recoil water outlet that this is carried to greasy dirt is delivered in homogeneous snubber assembly by pipeline, mud after sedimentation is discharged by homogeneous snubber assembly bottom, and oily(waste)water continues to pump in strainer to filter; State that with clear water or air, strainer to be recoiled be the pressure difference value of setting according to strainer, by PLC system, automatically control.
2) waste water of removing suspended particulate is delivered in water-and-oil separator, isolates the oil (comprising suspension oil, dispersed oil and oil in water emulsion) in waste water, obtain oleaginousness and be less than or equal to purifying waste water of 10mg/L.
3) oil in isolated waste water is collected in storage tank, will purifies waste water to collect reuse or be delivered to Sewage treatment systems and process.
Referring to Fig. 1, oil refining Wastewater by Electric desalination black liquor treatment system of the present invention, comprise the homogeneous snubber assembly 1 with liquid outlet, oil slick outlet and mud discharging mouth, strainer 2 and water-and-oil separator 3, the liquid outlet of homogeneous snubber assembly 1 is connected with the fluid inlet of strainer 2 by pipeline, on the pipeline between homogeneous snubber assembly 1 and strainer 2, be also provided with water pump 5, oil-containing water in homogeneous snubber assembly 1 is squeezed into strainer 2 by water pump 5, the operating pressure of water pump is low, only need 0.1~0.3Mpa, the filtration resistance of system is little, energy-conservation.The oily(waste)water outlet of strainer 2 is connected with the fluid inlet of water-and-oil separator 3 by pipeline, is provided with oil outlet and water port on water-and-oil separator 3; Described strainer 2 is automatic backwashing filter, recoil is controlled automatically by PLC system, when the pressure difference of strainer reaches set(ting)value, utilize clear water or air to recoil to this strainer, recoil water outlet is carried pollutent and is again entered in homogeneous snubber assembly by pipeline, sedimentation again, separated rear discharge.And this automatic backwashing filter is connected with homogeneous snubber assembly 1 by drainage pipeline.。
Homogeneous snubber assembly 1 is by the external floating oil collecting tank 6 of pipeline, described homogeneous snubber assembly 1 adopts perpendicular stream slurry tank, Horizontal sedimentation tank or buffering pond, and particular location can be set according to the size of actual oleaginousness in the size of homogeneous snubber assembly and the position of inlet and outlet pipe lines.The oil outlet of described water-and-oil separator 3 is connected with storage tank 4 by pipeline, and at the oil outlet place of water-and-oil separator 3, automatic oil draining valve is set.
Oil refining Wastewater by Electric desalination black liquor treatment system of the present invention, in use:
Electric desalting black liquor is collected into homogeneous snubber assembly by pipeline, in homogeneous snubber assembly, hydraulic detention time is 1~2 hour, the effect of homogeneous snubber assembly has 2: the one, and the regulating water quality water yield, the 2nd, allow in black liquor can floating upward quickly material float up on the water surface as part ageing oil, oil slick etc., by overflow, be isolated and send homogeneous snubber assembly, send into refinery's effluent oil treatment system or telegram in reply desalter.The clear liquid of homogeneous snubber assembly is connected to water pump by tank body middle part pipeline, by pump, squeeze into strainer, remove impurity, suspended substance and small part oily substance, make suspension content≤5mg/L, water after filtering enters water-and-oil separator, separated oil in water emulsion, dispersed oil also decolour to black liquor, make final outflow water oil-contg≤10mg/L, and the discharge water after processing enters Sewage treatment systems again and carries out biochemical treatment.
Strainer of the present invention is automatic backwashing filter, when this strainer Inlet and outlet water pressure reduction reaches set(ting)value, system is opened backwashing procedures automatically, recoil water outlet is carried pollutent and is entered homogeneous snubber assembly bottom by homogeneous snubber assembly middle and lower part pipeline, precipitate and separate again in snubber assembly, the mud discharging mouth with bottom of device of interruption is discharged.The material of water-and-oil separator separation enters storage tank by the oil discharge outlet at its top, regularly sends into stock oil system.
In conjunction with example, illustrate:
Certain petrochemical plant electric desalting black liquor, oil-contg >10000mg/L.First electric desalting black liquor enters in tank by the pipeline of homogeneous surge tank middle and upper part, stops 1 hour, makes oleaginousness drop to 3000mg/L.Homogeneous surge tank adopts perpendicular stream slurry tank, can be also other gravity settling facilities such as horizontal tank, buffering pond.
Water outlet enters water pump by the pipeline at surge tank middle part, and hydraulic pressure 0.1~0.3MPa, squeezes into strainer by water, removes the suspended substance in water, uses water suspension content and is less than 5mg/L.When filter differential pressures reaches (set(ting)value), with the clear water after filtering, strainer is recoiled, recoil is undertaken by PLC automatic control.Recoil water outlet enters surge tank middle and lower part by pipeline.The waste water of removing suspended substance through filter enters water-and-oil separator by connecting tube again, the suspension oil in separated water outlet, dispersed oil and oil in water emulsion, and water outlet oil-containing is less than 10mg/L.Isolated oil is collected into floating oil collecting tank by the automatic oil draining valve at separator top, regularly outward transport.Water after purification enters sewage treatment plant or reuse.
For a person skilled in the art, can make other various corresponding changes and distortion according to technical scheme described above, and within all these changes and distortion all should belong to the scope of the claims in the present invention protections.

Claims (10)

1. a treatment process for oil refining Wastewater by Electric desalination black liquor, is characterized in that, comprises the following steps:
1) electric desalting black liquor is delivered in homogeneous snubber assembly, sedimentation was processed after 1~2 hour, the floating oil slick in liquid upper strata is delivered in floating oil collecting tank, the oily(waste)water of lower floor is pumped into the suspended particulate content being filtered in waste water in strainer by water pump and be less than or equal to 5mg/L;
Wherein, during filter operation, also comprise with clear water or air strainer is recoiled, obtain carrying the recoil water outlet of pollutent, this is carried to pollutent recoil water outlet is delivered in homogeneous snubber assembly by pipeline, mud after sedimentation is discharged by homogeneous snubber assembly bottom, and oily(waste)water continues to pump in strainer to filter;
2) waste water of removing suspended particulate is delivered in water-and-oil separator, isolates the oil in waste water, obtain oleaginousness and be less than or equal to purifying waste water of 10mg/L.
2. the treatment process of a kind of oil refining Wastewater by Electric desalination black liquor according to claim 1, is characterized in that, also comprises the oil in isolated waste water is collected in storage tank, will purify waste water to collect reuse or be delivered to Sewage treatment systems and process.
3. the treatment process of a kind of oil refining Wastewater by Electric desalination black liquor according to claim 1, is characterized in that, the pressure of described water pump is set to 0.1~0.3MPa.
4. the treatment process of a kind of oil refining Wastewater by Electric desalination black liquor according to claim 1, is characterized in that, described strainer recoil with clear water or air is the pressure difference value of setting according to strainer, by PLC system, automatically controls.
5. the treatment process of a kind of oil refining Wastewater by Electric desalination black liquor according to claim 1, is characterized in that, fills and have the filter core that the modified fiber materials of hydrophilic oleophobic property is made in described strainer.
6. a treatment system for oil refining Wastewater by Electric desalination black liquor, is characterized in that, comprises the homogeneous snubber assembly (1) with oil slick outlet, mud discharging mouth and liquid outlet, strainer (2) and water-and-oil separator (3); The liquid outlet of homogeneous snubber assembly (1) is connected with the fluid inlet of strainer (2) by pipeline, the oily(waste)water outlet of strainer (2) is connected with the fluid inlet of water-and-oil separator (3) by pipeline, and water-and-oil separator is also provided with oil outlet and water port on (3); On the pipeline between homogeneous snubber assembly (1) and strainer (2), be also provided with water pump (5); Described strainer (2) is the automatic backwashing filter with PLC Controlling System, and this automatic backwashing filter is connected with homogeneous snubber assembly (1) by drainage pipeline.
7. the treatment system of a kind of oil refining Wastewater by Electric desalination black liquor according to claim 6, is characterized in that, the oil outlet of described water-and-oil separator (3) is connected with storage tank (4) by pipeline.
8. the treatment system of a kind of oil refining Wastewater by Electric desalination black liquor according to claim 6, is characterized in that, the oil outlet place of described water-and-oil separator (3) arranges automatic oil draining valve.
9. the treatment system of a kind of oil refining Wastewater by Electric desalination black liquor according to claim 6, is characterized in that, described homogeneous snubber assembly (1) is by the external floating oil collecting tank of pipeline (6).
10. the treatment system of a kind of oil refining Wastewater by Electric desalination black liquor according to claim 6, is characterized in that, described homogeneous snubber assembly (1) adopts perpendicular stream slurry tank, Horizontal sedimentation tank or buffering pond.
CN201410038386.5A 2014-01-26 2014-01-26 A kind for the treatment of process of oil refining Wastewater by Electric desalination black liquor and system Active CN103755052B (en)

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CN106281410A (en) * 2016-10-17 2017-01-04 广汉市思科信达科技有限公司 A kind of ultrasonic dehydration desalting and dewatering pipeline
CN110985317A (en) * 2019-12-20 2020-04-10 陈烨 Geothermal power generation device based on acid dew point
CN111196620A (en) * 2020-01-20 2020-05-26 重庆科技学院 Oil-water separation device and method for treating wastewater in metallurgical industrial process

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Cited By (5)

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CN110985317A (en) * 2019-12-20 2020-04-10 陈烨 Geothermal power generation device based on acid dew point
CN111196620A (en) * 2020-01-20 2020-05-26 重庆科技学院 Oil-water separation device and method for treating wastewater in metallurgical industrial process
CN111196620B (en) * 2020-01-20 2022-04-22 重庆科技学院 Oil-water separation device and method for treating wastewater in metallurgical industrial process

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