CN100525926C - Method for treating oil refining sewage by employing multi-stage inflatable cyclonic current technology - Google Patents
Method for treating oil refining sewage by employing multi-stage inflatable cyclonic current technology Download PDFInfo
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- CN100525926C CN100525926C CNB2007101177278A CN200710117727A CN100525926C CN 100525926 C CN100525926 C CN 100525926C CN B2007101177278 A CNB2007101177278 A CN B2007101177278A CN 200710117727 A CN200710117727 A CN 200710117727A CN 100525926 C CN100525926 C CN 100525926C
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Abstract
The invention provides a method for refinery waste water treatment by multi-stage air-sparged hydrocyclone technique, which can high effectively recycle floating oil, dispersed oil and emulsified oil of the refinery waste water, and eliminate most of suspension at the same time. The invention is mainly characterized in that: through setting at least two-stage air-sparged hydrocyclone, and combining the use of demulsifier, coagulant and coagulant aids, physiochemical treatment is carried out to high concentration oily waste water produced by all devices during the refinery process, and the releasing water after treatment can meet the biochemical stage water indices of normal waste water treatment field. The technique of the invention can substitute the physiochemical treatment stage (the first stage treatment) of the existing refinery waste water treatment process, and is characterized by high effect, occupying small land, and saving the investment, etc.
Description
Technical field
The present invention relates to a kind of method that adopts multi-stage inflatable cyclonic technical finesse oil refining sewerage, belong to oil refining sewerage treatment technology category.
Background technology
Oil refining sewerage is handled and is solved two problems emphatically: at first be to remove petroleum-type and suspension in the sewage by physico-chemical process (one-level processing); Could consider then to dispose COD, BOD, NH in the water by biochemical process
3Organic pollution materials such as-N.
Oil content in the oil refining sewerage generally exists with oil slick, dispersed oil, oil emulsion, four kinds of forms of dissolving wet goods: (1) oil slick, it spreads over the sewage surface and forms oil film or oil reservoir, oil droplet size is bigger, generally greater than 100 μ m, accounts for more than 70%～80% of total oil content amount; (2) dispersed oil is dispersed in the sewage with the elaioleucite shape, and instability often becomes oil slick after leaving standstill a period of time, and oil droplet size is at 100～25 μ m; (3) oil emulsion is the milkiness shape in sewage, the oil droplet outside is being wrapped one deck hydration shell and had a certain amount of negative electrical charge, contains certain amount of surfactant in the water again, make to be difficult between the elaioleucite merge, and stable for extended periods of time, the elaioleucite footpath is generally at 25～0.1 μ m; (4) dissolved oil, oil is dissolved in the water, and particle diameter is below 0.1 μ m, and extremely difficulty is separated.
Handle (one-level processing) for this class from the materialization of the oil-polluted water of refinery at present and adopt plurality of devices to make up, treatment process is as follows: come water-advection oil separation tank-inclined plate grease pond-air supporting.Oil removal is a kind of of Gravity Separation method, its principle is under the gravity effect, petroleum-type contained in the waste water and other suspended impurity are separated voluntarily according to different relative densities, relative density less than 1 floating naturally on, relative density is greater than 1 sinking, thereby reach the purpose of separation, processing to as if oil slick and thick dispersed oil.Advection oil separation tank can be removed the oil droplet of particle diameter more than or equal to 150 μ m, and the oil droplet of particle diameter more than or equal to 60 μ m can be removed in the inclined plate grease pond.Because being gravity type, advection oil separation tank, inclined plate grease pond separate, make two motive forces that are separated have only an acceleration of gravity by gravitational settling, therefore treatment process needs dwell time of sewage long, equipment volume is huge, floor space is many, cost of investment height, management difficulty are big, running is discontinuous, and be difficult to handle finely divided oil (particle diameter is less than 50 μ m oil droplets) and oil emulsion, have only in the sewage oil emulsion content less than 30mg/L, dissolved oil content just has good deoiling effect during less than 10mg/L.
Because oil removal is relatively poor to finely divided oil in the refinery(waste) water, oil emulsion removal effect, so need carries out air supporting after the oil removal and handle.To be the micro-bubble that utilizes high degree of dispersion remove to adhere to the suspension that oil droplet in the water or relative density approach water as carrier to the air supporting method, and it is removed to the water surface with air bubble buoyancy, can remove the oil emulsion of the finely divided oil and the overwhelming majority.Using at present more in the refinery oily waste water treatment is pressure dissolved air floatation, cavitation flotation and jet flotation.The cavitation flotation device exists and makes trouble, keeps in repair that trouble, energy consumption are higher, efficient is sharply descended the degradation problem under the higher situation of treatment media temperature.The jet flotation unit is a kind of oil conte, sewage treatment device that occurs in recent years, and the jet floatation can provide power with a water pump, has reduced energy consumption than the cavitation flotation, but has problems such as equipment manufacturing cost height, maintenance maintenance difficulty, operation stability difference.Pressure dissolved air floatation is a method comparatively commonly used.This dissolved air flotation device is in operation, after the molten pressure air-dissolving water of being so incensed that enters flotation cell (also claiming flotation tank), be depressurized release and produce microbubble by release, this microbubble at the volley with sewage in suspension contact in the same way and adhere and become the particle that certain speed is arranged, particle by on float to the surface and blow off by slag scraping mechanism, thereby finish removing to suspension in the former water.Device generally is furnished with complicated setting such as force (forcing) pump, air compressor, ejector, high pressure dissolving, release, and entire equipment is bulky, and operation and maintenance is all had the higher requirement of ratio.
Therefore conventional materialization treatment process (one-level processing) has following shortcoming: floor space is big, equipment investment, capital construction and operation and maintenance cost height, and dwell time of sewage is long etc.
At the deficiency of said method,, developed technology of Hydrocyclone Scperation gradually since the sixties in 20th century.A series of patents about cyclone separation process have appearred, the patent No. of partial monopoly is respectively US4237006, US4231368, US4544486, US4464264, US4719014, US4721565, US4749490, CN2459311Y, CN1112522A, CN2221996Y, CN1199871C, CN1570033A, CN1817404A, CN1541948A, CN1546196 etc., wherein discloses the application of cyclone separation process at all kinds of oil water separation processes respectively.Cyclone separation process is considered to a kind of high-efficiency and energy-saving type oily water separation technique, and it has following advantage: simple in structure; Cost is low, in light weight, maintenance cost is few, energy consumption is low; Convenient and flexible installation, cyclone can be installed at any angle; Work is continuous, reliable, convenient operating maintenance efficient height; Adaptability is good, and operation and adjustable range are wide etc.
Simultaneously, rotational flow separation also has weak point: because the certain shear action of mobile generation of cyclone inner fluid, if parameter designing is improper, easily drop (oil droplet or water droplet) is smashed and caused emulsification and worsen separation process; Owing to handle the cyclone that material of different nature often needs different structure size or operating condition, the versatility of rotational flow separation operation is relatively poor.In a word, the oil water mixture of different crude oils often has different rerum naturas, and therefore, the cyclone that is used for different quality often can not exchange use.
Common cyclone is the column hydrocyclone, treatment effect for oil slick, dispersed oil is relatively good, but the removal effect for oil emulsion still is poor, and the strong point of flotation unit is that treatment effeciency to oil emulsion is than higher, technology maturation is reliable, but more poor for coming in the water oil content than condition with higher adaptability, can see that thus cyclone and flotation unit respectively have characteristics, deficiency is respectively arranged.On the other hand, from the oil-polluted water complicated component of domestic refinery, wish that the processing that utilizes the alternative flotation unit of cyclone to be used for oil-polluted water also needs concrete result of study and supports in wideer adaptability scope.
(Air-Sparged Hydrocyclone ASH) is further developing technology of Hydrocyclone Scperation on the basis of common column hydrocyclone to the inflation hydrocyclone.Nineteen eighty-three, Miller and Hupka have carried out the research of oil-water separation test the earliest with the inflation hydrocyclone of φ 50mm, and what evidence ASH can success carries out water-oil separating.1993, J.P.Beeby and S.K.Nicol carried out the research of concentrated oil-in-water emulsion with the inflation hydrocyclone of φ a 50 * 500mm, and what the result showed that ASH can success isolates chemically stable emulsus oil from sewage.With the index of turbidity as concentration of emulsion used, when the oil concentration of charging was 400mg/L, turbidity removal rate can reach 96% in its underflow.1996, Yu Renhuan etc. utilized homemade φ 55mmASH to carry out purifying the research of oil-polluted water, and under the situation of flow of inlet water 53.3L/min, oil-containing 75mg/L, gas-liquid volume ratio=1, oil removal rate reaches 74.6%.
The inflation hydrocyclone is as an improvement of conventional cyclone, limit wall aerating by cyclone, the flow performance of dissolved air floatation and hydrocyclone is combined, its application in the water-oil separating field is more still being studied the exploratory stage, treatment effect and operating condition, and the selection of device parameter still will be subjected to the concrete condition restriction of the water quality of handling.The composition of all kinds of oil contents is owing to having than big-difference the processing purpose thing of crude oil is different in the oil refining sewerage, set up cover applicability treatment system widely, realization has significant Practical significance to the efficient processing of oil refining sewerage, and the industrial applications of inflation hydrocyclone in oil refining sewerage is handled also do not reported at present.
Summary of the invention
The objective of the invention is for the oil refining sewerage preliminary treatment provides that a kind of technology is simple, flow process is short, control is convenient, management is simple, floor space is little, efficient, low consumption, the oil refining sewerage materialization treatment system and the method for reducing investment outlay, to substitute oil removal, the flotation cells in the existing sewage physicochemical handling process, oil content of wastewater after this PROCESS FOR TREATMENT is reached below the 30mg/L, suspension drops to below the 90mg/L, satisfies oil refining sewerage and handles a biochemical section water inlet requirement.
The invention provides a kind of employing multi-stage inflatable cyclonic technology (in advance) and handle the method for oil refining sewerage, comprise following process:
The high concentration oil-polluted water that each device of refinery is produced enters transfer pipeline through after being forced into 0.2～0.3MPa, in transfer pipeline, add demulsifier, make it with pressurized oil-polluted water jointly through static mixer or venturi mixer and in pipeline, keep to enter one-level inflation hydrocyclone after 15～25 seconds and implement water-oil separating, isolated oils composition is overflowed by top and enters the slop tank recovery, and the oil-polluted water after the preliminary purification is flowed out by the bottom and enters the sewage surge tank; Described demulsifier is the polyacrylamide demulsifier, and it is neutral substantially, and molecular weight is 600 ten thousand～700 ten thousand, and the demulsifier dosage is 0～20 mg/litre treatment sewage;
The described oil-polluted water of discharging through the sewage surge tank adds coagulant in transfer pipeline, utilize the pump class to realize fully mixing of medicament and sewage and be forced into 0.2～0.3MPa, add flocculation aid after making this sewage of sneaking into coagulant in pipeline, keep 20～25 seconds reaction time, the input secondary was inflated hydrocyclone after this sewage that has added coagulant and flocculation aid passed through static mixer or venturi mixer, and control this effluent stream cross described blender to the time that enters secondary inflation hydrocyclone be 15～25 seconds, sewage is after the processing of second cyclone, flco in the sewage is overflowed by cyclone top and forms scum silica frost realization removal, water outlet is flowed out by the bottom becomes pretreated water, for further implementing biochemical treatment.
According to pretreating process provided by the invention, before each installs and enters one-level inflation hydrocyclone after the high concentration oil-polluted water (former water) that produces compiles with the refinery, can add an amount of demulsifier earlier according to oil-containing situation wherein, fully mix to be incorporated in oil-polluted water and keep certain hour (15～25 seconds) in the pipeline and be beneficial to the breakdown of emulsion of realization sewage, this reaction time decides on oil emulsion in the sewage and ss suspended solid content, enters one-level inflation hydrocyclone then and implements water-oil separating.Character at oil refining sewerage, the present invention can add an amount of polyacrylamide earlier and strengthen sewage is implemented breakdown of emulsion as demulsifier, when removing oil slick, reclaim most of oil emulsion and dispersed oil in the sewage as far as possible, this demulsifier is neutral substantially, molecular weight is 600 ten thousand～700 ten thousand, can directly be purchased or require producer to produce on request.According to the solution of the present invention, oil emulsion content is low to moderate that 150mg/ rises or when following, the dosage of demulsifier is 0～10 mg/litre treatment sewage in the transfer pipeline in the described oil-polluted water that produces from each device of refinery.If when oil emulsion content was higher than 150mg/ and rises in the described oil-polluted water that produces from each device of refinery, the dosage of demulsifier was 10～20 mg/litre treatment sewages in the transfer pipeline.
The method according to this invention, handle through the preliminary water-oil separating of one-level inflation hydrocyclone, most of petroleum-type composition can be recovered substantially in the sewage, can satisfy the water inlet requirement of the biochemical section in sewage-farm, refinery for making final draining, also need earlier to add coagulant respectively and flocculation aid is built bridge, net is caught etc., make suspension and remaining oil content (petroleum-type) in the water form bigger flco, enter the further purified treatment of secondary inflation hydrocyclone then.Can use conventional coagulant and flocculation aid this moment, for example, coagulant can be aluminium salt system or molysite based flocculating agent (aluminium chloride, PAFC, aluminium chloride, calcium aluminate etc.), flocculation aid then can be acrylamide polymer FO4190SH, FO4440SH, the polyacrylamide medicaments such as FO4800, FO4190PG of company (French SNF), the concrete dosage of coagulant and flocculation aid all can be according to routine operation, preferably, the dosage of flocculation aid and coagulant is respectively 1～2 milligram of every liter of staying water and 50～150 milligrams.
According to technology of the present invention, treatment sewage enters pipeline through suitably pressurize (for example by centrifugal pump or other delivery pump), this is come water to add demulsifier and mixes through static mixer or venturi mixer, duct length then should be kept sewage (under the flow of setting) and stop therein 20～25 seconds, give water-oil separating and demulsifier and sewage the abundant haptoreaction time, the emulsification wet goods is formed than larger oil droplet by breakdown of emulsion, enter the recovery that one-level inflatable cyclonic separator is finished sump oil (petroleum-type) then.
According to technology of the present invention, in the adding pipeline of opportunity before the water outlet of one-level inflation hydrocyclone enters pump of coagulant, pump class used herein has the device of certain flow rate for realizing to the mixed glassware for drinking water that comes that mixes and make that comes water, for example can use centrifugal pump, the effect of mixing that the sewage of sneaking into coagulant makes full use of impeller reacts, duct length behind the pump should be able to be kept sewage and stop therein 20～25 seconds, gives coagulant and sewage sufficient reaction time; Simultaneously, pipe-line mixer also is set in the pipeline, this blender can be static mixer or venturi mixer, sewage also need add flocculation aid before entering blender, for realize with coagulation after fully the mixing of sewage, the time that the effluent stream piping blender that control has added flocculation aid enters secondary inflation hydrocyclone is 15～25 seconds (flow velocity and the duct length of control sewage), in the reaction time of build bridge, net being caught, makes the formation of sewage PetroChina Company Limited. class oil content and suspension than big flocculating body.
According to technology of the present invention, the intake pressure of inflation hydrocyclone is 0.2～0.3MPa; Inflation line gauge pressure 0.3～0.4MPa; Consider that from point of view of practicability source of inflation gas can be in the factory compress wind or air compressor provides.
According to technology of the present invention, at the scene in the treatment system, described oil-polluted water that produces from each device of refinery removes oil tank or sewage surge tank through a sedimentation earlier before sending into one-level inflation hydrocyclone, recovery section oil slick and dispersed oil and remove silt.The water outlet of one-level inflation hydrocyclone is also first through the sewage surge tank before entering secondary inflation hydrocyclone;
Be appreciated that from the description of front, key of the present invention is to be provided with multistage (being secondary at least) inflation hydrocyclone and relevant corollary equipment being used for that the high concentration oil-polluted water of refinery discharging is implemented pretreated system, and according to the characteristic of processing sewage, one-level inflation hydrocyclone that is adopted and/or secondary inflation hydrocyclone comprise the combination of a group or more cyclone respectively, for example, any one-level rotational flow separation can be the series connection of two groups or three groups cyclones, to reach the treatment effect of expection.For the oil-polluted water of special nature, the inflation hydrocyclone (water outlet of second cyclone enters next stage or multistage cyclone again) more than secondary also can be set, reach the water standard of oil plant oilfield sewage field biochemical treatment to guarantee water outlet.
Structure and operation principle about the inflation hydrocyclone, those of ordinary skills can both know, can be with reference to illustrated in Figure 2, the difference of itself and common cyclone separator is that the wall of this device flotation section has adopted poromerics, become an antipriming pipe, hole is at 5～100 μ m, and pore size can be controlled during fabrication according to the difference of purposes.In operation air-flow (air or nitrogen or other inert gases) " squeezes " from the hole of outside chuck by wall under certain pressure and goes into the flow field, oil-polluted water enters under certain pressure along the tangential inlet of cyclone feed zone, because the restriction of wall forms eddy flow.The air-flow that enters from hole is divided into a large amount of tiny bubbles by the shear action of high speed rotating fluid, hydrophobic particulate in the water (as oil droplet, suspension etc.) is collided mutually with bubble and is adsorbed, under centrifugal action, enter the Thysanophyllum at center, and then flow into overflow pipe formation overflow vertically upward; And flow out the formation underflow from the bottom near most of liquid stream of wall.Whole process has realized the combination of flotation and eddy flow, has improved removal efficient.
The inner chamber of the inflation hydrocyclone that is adopted in the technology of the present invention is preferably the sintered titanium antipriming pipe, and its average pore size is 5 μ m, and percent opening is 30～50%, and wall thickness is 3mm, and air penetrability is 2～9 * 10
-3L/mincm
2MmH
2O, water body in cyclone the time of staying less than 1 second, than traditional air-float method, under the suitable situation of oil removal rate, the most outstanding advantage of technology of the present invention is that the time of staying that sewage can be in separator is extremely short, usually can in 1 second, finish, and traditional air-float method needs 15～20 minutes usually; The use of fiting chemical medicament, the present invention can either remove oil slick, dispersed oil, also can remove oil emulsion, and testing result shows that the present invention adopts the inflation hydrocyclone more can realize particle diameter in the sewage is low to moderate the removal of the oil droplet of 4 μ m.
In a word, treatment system of the present invention and technology generations both can be handled oil refining sewerage for conventional oily waste water treatment materialization section, can handle other high concentration oil-polluted waters again.Oil removal and/or the flotation of adopting the inflation hydrocyclone to substitute in the traditional handicraft are handled, occupation area of equipment is little, corresponding adjustment operating condition of character and parameter at treatment sewage, the simple more and convenient control of technology, improved versatility, whole technology reaches efficiently, low consumption, the purpose of reducing investment outlay.Popularization in the field of business will produce the social benefit and the economic benefit of highly significant as Petrochemical Enterprises sewage disposal supporting technology.
Description of drawings
Fig. 1 is the process flow diagram of the embodiment of the invention 1.
Fig. 2 is the generalized section that adopts the inflation hydrocyclone among the embodiment 2.
The specific embodiment
Introduce implementation process of the present invention and the beneficial effect that produced in detail below in conjunction with the drawings and specific embodiments, be intended to help the reader to understand spiritual place of the present invention better, but but can not be interpreted as any qualification the present invention's practical range.
Embodiment 1 adopts the technology of multi-stage inflatable cyclonic technical finesse oil refining sewerage
See also Fig. 1, the centrifugal pump 12 that the high concentration oil-polluted water that each device of refinery produces is connected on earlier by this pipeline in the pipeline that is sent to one-level inflation hydrocyclone 2 is forced into 0.2～0.3MPa, add medicinal cupping 1 by demulsifier then and sneaked into an amount of demulsifier, maintain after making this pressurization sewage of sneaking into demulsifier through static mixer 16 (or venturi mixer) to react in the pipeline and entered one-level in 15～25 seconds after (deciding) and inflate hydrocyclone 2 and carry out water-oil separating on oil emulsion in the sewage and SS content, the used source of the gas of rotational flow separation operation can be provided by compress wind in the factory or air compressor machine, and sewage PetroChina Company Limited. class oil content is overflowed by top and is back to the slop tank (not shown) and finishes recovery; Oil-polluted water is flowed out by the bottom and enters surge tank 13 after the preliminary purification.In this process, need basis to come the content of oil emulsion in the water that the demulsifier in the medicinal cupping 1 is measured and add to sewage.
In the said process, the intake pressure of firsts and seconds inflation hydrocyclone is 0.2～0.3MPa; Gas ducting gauge pressure 0.3～0.4MPa, gas-liquid volume ratio are 2～3.
Identical with present operation, can be pooled to a sedimentation earlier from sewage of each device of refinery and remove oil tank or sewage surge tank (not shown), also can tentatively remove oil slick in the sewage and silt particle earlier playing the water quality and quantity while of stablize the entire process process.
The firsts and seconds inflation hydrocyclone 2 and 3 that uses in the flow process of embodiment 1 can be conventional inflation hydrocyclone, also can be to inflate hydrocyclone (ASH) as described in Figure 2.
With reference to figure 2, this inflation hydrocyclone is made up of three parts such as feed zone, flotation section, underflow sections.Connect by flange between each section.The profile of whole cyclone equipment is cylindrical.
In the middle and upper part of feed zone is feed pipe 21, and sewage enters cyclone from adopting the tangential admission mode here.The feed zone top design has overflow pipe 22 and gland 23.Gland 23 outsides are connected with the feed zone screw top, and the inboard is threaded with overflow pipe 22, can adopt the gland and the overflow pipe of different inner diameters like this according to water quality requirement, and the external diameter of gland 23 remains unchanged, and its internal diameter then keeps supporting with overflow pipe 22 external diameters.
The flotation section is made of inside and outside two-layer cavity, the sintered titanium antipriming pipe that internal layer cavity 24 selects for use Beijing Non-Fervoous Metal Inst. to make, its average pore size is 5 μ m, the about 3mm of wall thickness, whole cavity 24 internal diameters equate with the feed zone internal diameter, outer 24 ' as to make and the body concentric with internal layer cavity 24 for the 1Cr18Ni9Ti stainless steel material, the two forms interlayer (also claiming chuck), and this interlayer one side setting and skin have the air inlet pipe 25 of same material.For making air inlet even, air inlet pipe 25 is two arms in wall punishment, divide two strands with air inlet, for preventing the impact of air-flow to the antipriming pipe part, the tube head of two arms of air inlet pipe 25 is closed, and two arms stretch into sandwich portion radially upward to offering a plurality of even air admission holes, air enters chuck by these air admission holes.
Underflow section material is an ordinary carbon steel, and its bottom is with internal thread (internal thread) 29, cooperates with screw rod 27.The top of screw rod 27 is fastening with foam base 26 by the mode that is threaded.Foam base 26 is a truncated cone shape, by the rotation of screw rod 27, can be implemented in the lifting of underflow section, thereby changes the underflow annular space area between this foam base 26 and the outlet of flotation section inner chamber.In addition, underflow pipe 28 is arranged, be used to discharge the water after the purification in the bottom design of equipment.
Embodiment 3
Flow process and the on-the-spot pilot plant test of operating the employing multi-stage inflatable hydraulic cyclone technical finesse oil refining sewerage that takes the lead in having carried out according to embodiment 1 and embodiment 2 in Liaohe River petrochemical industry branch company.Design disposal ability 5t/h; Reach the expection operational effect.
Liaohe River petro-chemical corporation mainly processes the viscous crude and the super viscous crude of Liaohe Oil Field, and treatment sewage has the typical characteristics of condensed oil sewage.Oil slick, dispersed oil, oil emulsion, dissolved oil degree are respectively 40.4%, 6.1%, 51.7%, 1.6% in the former water.As seen the contained oils of former water is based on oil slick, oil emulsion, and the emulsification degree is higher, thus present embodiment oil-polluted water to be processed belong to the difficult oil-polluted water of high oil-containing, high emulsification, high suspended matter.
Main water quality index scope is as follows:
| Sequence number | Project | Unit | Indication range |
| 1 | Water temperature | ℃ | <38 |
| 2 | pH | 6-9 | |
| 3 | Oil | mg/L | 800-1000 |
| 4 | CODcr | mg/L | 1000-2500 |
| 5 | Suspension (SS) | mg/L | 1000-3000 |
Liaohe River petrochemical industry refinery sewage is implemented the description of the idiographic flow operation of processing referring to embodiment 1, the high concentration oil-polluted water that each device produces is forced into 0.3MPa through centrifugal pump 12, and in this water pipeline, add demulsifier simultaneously according to setting flow, make the two realize fully mixing through static mixer 16, and reaction enters one-level inflation hydrocyclone 2 after about 25 seconds in pipeline subsequently, source of the gas can be provided by compress wind in the factory or air compressor machine, and petroleum-type is overflowed by top and is sent to slop tank and is recovered; Oil-polluted water after the preliminary purification is flowed out by bottom underflow pipe 28 and enters surge tank 13.
The water outlet of surge tank 13 stir to realize fully mixing of medicament and sewage and is pressurized to 0.3MPa through centrifugal pump 14 impellers jointly with the coagulant in being added to pipeline, reaction adds flocculation aid after about 25 seconds in pipeline, flow through static mixer or venturi mixer 15, and enter secondary inflation hydrocyclone 3 through hydraulic pipeline, this effluent stream is crossed blender 15 and was entered in secondary inflation hydrocyclone 3 processes control reaction about 20 seconds, with finish bridge formation, net is caught; Suspension and residual petroleum class oil content form than entering secondary inflation hydrocyclone 3 behind the big flocculating body in the water, flco is overflowed by cyclone top and forms scum silica frost realization removal, water outlet is flowed out by bottom underflow pipe 28, and this water outlet can reach wastewater treatment field biochemical treatment water inlet requirement.
At the character of Liaohe River petrochemical refining sewage, select polyacrylamide (FO4190SH of French SNF company, molecular weight 600 ten thousand～700 ten thousand) sewage to be implemented breaking milk and removing oil as demulsifier, dosage is 15 mg/litre treatment sewages; Coagulant is an aluminum sulfate, and dosage is 150mg/L, and flocculation aid is the French SNF FO4800 of company water treatment agent, and dosage is 2mg/L;
Intake pressure when one-level inflatable cyclonic separator 2 separates with secondary inflation hydrocyclone 3 is 0.2～0.3MPa, and source of inflation gas is a compress wind in the factory, inflation line gauge pressure 0.3～0.4MPa;
The wall of inflatable cyclonic device 2,3 adopts the sintered titanium antipriming pipe, and its average pore size is 5 μ m, and voidage is 30～50%, thickness 3mm, air penetrability 2～9 * 10
-3L/mincm
2MmH
2O; In this processing procedure water body in cyclone the time of staying all less than 1 second.
Through the effect of above-mentioned pretreating process to sewage disposal:
Between the average 800～1000mg/L of water inlet PetroChina Company Limited. class sump oil content from source of sewage, CODcr fluctuates at 1000～2500mg/L, suspension 1000～3000mg/L, effluent quality is basicly stable after the secondary rotational flow separation, oil-containing (petroleum content) is lower than 30mg/L, average 600～the 800mg/L of CODcr, suspension is lower than 90mg/L, can directly enter biochemical section fully and carry out subsequent treatment;
Can think that the present invention can solve the handling problem of sewage PetroChina Company Limited. class, COD, suspension, replace conventional materialization handling process.
Embodiment 4
According to flow process and the operation of embodiment 1 and embodiment 2, carried out adopting the on-the-spot pilot plant test of multi-stage inflatable hydraulic cyclone technical finesse oil refining sewerage in alkene division department of Ba Ling petrochemical industry Co., Ltd.Design disposal ability 5t/h; Reach the expection operational effect.
Alkene division department of Ba Ling petrochemical industry Co., Ltd is based on processing paraffinic base light crude oil, and water quality is better, and oil slick in the former water, dispersed oil content are higher, oil emulsion, dissolved oil ratio are lower.
Alkene division department refinery sewage is implemented the description of the idiographic flow operation of processing referring to embodiment 1,, do not add demulsifier before the one-level inflation hydrocyclone at the character of this oil refining sewerage.
Pump into secondary inflation hydrocyclone after one-level is inflated the hydrocyclone water outlet and coagulant and flocculation aid are fully mixed and carry out purified treatment, can use conventional coagulant and flocculation aid (identical with embodiment 3) this moment, and the dosage of flocculation aid and coagulant is respectively 1.0 milligrams of every liter of treatment sewages and 100 milligrams.
This pretreating process is to the effect of sewage disposal:
(oil emulsion content generally be no more than total petroleum-type 20%), the average 600～1500mg/L of CODcr between the average 300～800mg/L of water inlet PetroChina Company Limited. class content from source of sewage, suspension 300～1600mg/L, the technology effluent quality is basicly stable, oil-containing (petroleum content) is lower than 25mg/L, average 200～the 300mg/L of CODcr, suspension is lower than 60mg/L, can directly enter biochemical section fully and carry out subsequent treatment.
Embodiment 5
According to flow process and the operation of embodiment 1 and embodiment 2, carried out the lab scale test of multi-stage inflatable hydraulic cyclone technical finesse oil-polluted water in the laboratory.Design disposal ability 2.5t/h; Gas-liquid volume ratio is 3, and experiment effect is good.
Utilizing 0# diesel oil, crude oil (taking from the Ji Dong oil field) to prepare oil content with running water under the effect of TM50 type colloid mill in the laboratory is the emulsification oil-polluted water of 400 mg/litre, and its oil droplet average grain diameter is below 10 μ m.
The oil droplet average grain diameter is measured and is adopted the full-automatic grain graininess analyzer of Ku Erte (COULTERMULTISTZERII), measurement category 0.4～1200 μ m.OIL420 type Infrared Oil Determination Instrument is adopted in the measurement of oil content.
The emulsification oil-polluted water of preparation is implemented the description of the idiographic flow operation of processing referring to embodiment 1.At the character of this oil-polluted water, add demulsifier (identical) before the one-level inflation hydrocyclone with embodiment 3, dosage is 15 mg/litre treatment sewages.
The water outlet of one-level inflatable cyclonic separator with pump into secondary inflatable cyclonic separator after coagulant and flocculation aid fully mix and carry out purified treatment, can use conventional coagulant and flocculation aid (identical with embodiment 3) this moment, and the dosage of flocculation aid and coagulant is respectively 1.0 milligrams of every liter of treatment sewages and 100 milligrams.
This pretreating process is to the effect of sewage disposal:
About the class content average out to 400mg/L of water inlet PetroChina Company Limited. from source of sewage, the oil droplet average grain diameter is less than 10 μ m; Effluent quality is basicly stable, and on average about 15mg/L～30mg/L, the oil droplet average grain diameter is less than 4 μ m for petroleum content.
Embodiment 6
According to flow process and the operation of embodiment 1 and embodiment 2, carried out the lab scale test that the technical finesse of multi-stage inflatable hydraulic cyclone contains dispersed oil sewage in the laboratory.Design disposal ability 2.5t/h; Gas-liquid volume ratio is 3, and experiment effect is good.
Utilizing 0# diesel oil and running water to prepare oil content under the centrifugal pump shear action in the laboratory is the oil-polluted water based on dispersed oil of 1000 mg/litre, and its oil droplet average grain diameter is at 27 μ m.
The oil droplet average grain diameter is measured and is adopted the full-automatic grain graininess analyzer of Ku Erte (COULTERMULTISTZERII), measurement category 0.4～1200 μ m.OIL420 type Infrared Oil Determination Instrument is adopted in the measurement of oil content.
The oil-polluted water based on dispersed oil of preparation is implemented the description of the idiographic flow operation of processing referring to embodiment 1.At the character of this oil-polluted water, one-level inflation hydrocyclone does not add demulsifier.
The water outlet of one-level inflatable cyclonic separator with pump into secondary inflatable cyclonic separator after coagulant and flocculation aid fully mix and carry out purified treatment, can use conventional coagulant and flocculation aid (identical with embodiment 3) this moment, and the dosage of flocculation aid and coagulant is respectively 1.0 milligrams of every liter of treatment sewages and 100 milligrams.
This pretreating process is to the effect of sewage disposal:
About the class content average out to 1000mg/L of water inlet PetroChina Company Limited. from source of sewage, oil droplet average grain diameter 27 μ m; Effluent quality is basicly stable, and on average about 15mg/L～30mg/L, the oil droplet average grain diameter is less than 4 μ m for petroleum content.
Claims (8)
1, a kind of method that adopts multi-stage inflatable cyclonic technical finesse oil refining sewerage comprises following process:
The oil-polluted water that each device of refinery is produced enters transfer pipeline after being forced into 0.2～0.3MPa, in transfer pipeline, add demulsifier, make it to enter one-level inflation hydrocyclone in 15～25 seconds through static mixer or venturi mixer and in pipeline, holding time jointly and implement water-oil separating with pressurized oil-polluted water, isolated oils composition is spilled over to slop tank by top and reclaims, oil-polluted water after the preliminary purification is flowed out by the bottom and enters the sewage surge tank, described demulsifier is a polyacrylamide, it is neutral substantially, molecular weight is 600 ten thousand～700 ten thousand, and the demulsifier dosage is 0～20 mg/litre treatment sewage;
The described oil-polluted water of discharging through the sewage surge tank adds coagulant in transfer pipeline, utilize the pump class to realize fully mixing of medicament and sewage and be forced into 0.2～0.3MPa, add flocculation aid after making this sewage of sneaking into coagulant in pipeline, keep 20～25 seconds reaction time, the input secondary was inflated hydrocyclone after this sewage that has added coagulant and flocculation aid passed through static mixer or venturi mixer, and controlling this effluent stream, to spend the time that described blender enters secondary inflation hydrocyclone be 15～25 seconds, sewage is after the processing of second cyclone, flco in the sewage is overflowed by cyclone top and forms scum silica frost realization removal, water outlet is flowed out by the bottom becomes pretreated water, for further implementing biochemical treatment.
2, method according to claim 1, wherein, oil emulsion content is low to moderate that 150mg/ rises or when following, the dosage of demulsifier is 0～10 mg/litre treatment sewage in transfer pipeline in the described oil-polluted water that produces from each device of refinery.
3, method according to claim 1, wherein, when oil emulsion content was higher than 150mg/ and rises in the described oil-polluted water that produces from each device of refinery, the dosage of demulsifier was 10～20 mg/litre treatment sewages in transfer pipeline.
4, method according to claim 1, wherein, the dosage of flocculation aid and coagulant is respectively 1～2 milligram of every liter of treatment sewage and 50～150 milligrams.
5, method according to claim 1, wherein, the intake pressure of firsts and seconds inflation hydrocyclone is 0.2～0.3MPa; Gas ducting gauge pressure 0.3～0.4MPa, gas-liquid volume ratio are 2～3.
6, method according to claim 5, wherein, the source of inflation gas of firsts and seconds inflation hydrocyclone is from compress wind in the refinery or air compressor.
7, method according to claim 1, wherein, the wall of firsts and seconds inflation hydrocyclone adopts the sintered titanium antipriming pipe, and its average pore size is 5 μ m, and percent opening is 30～50%, wall thickness 3mm, air penetrability 2～9 * 10
-3L/mincm
2MmH
2O; Sewage in cyclone the time of staying less than 1 second.
8, method according to claim 1, wherein, described one-level inflation hydrocyclone and/or secondary inflation hydrocyclone comprise a group or more combination respectively.
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| CNB2007101177278A CN100525926C (en) | 2007-06-22 | 2007-06-22 | Method for treating oil refining sewage by employing multi-stage inflatable cyclonic current technology |
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| CNB2007101177278A CN100525926C (en) | 2007-06-22 | 2007-06-22 | Method for treating oil refining sewage by employing multi-stage inflatable cyclonic current technology |
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| CN103043746B (en) * | 2011-10-17 | 2014-02-05 | 中国石油天然气股份有限公司 | Degreasing method of super heavy oil wastewater |
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