CN101113035A - 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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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 suspended substance 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 in water 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 for some time, and oil droplet size is at 100～25 μ m; (3) oil in water 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 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) dissolving 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 oily(waste)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 action of gravity, 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 isolating purpose, 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 boat davit, advection oil separation tank, inclined plate grease pond separate, make the isolating impellent of two-phase have only a universal gravity constant by gravity 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 in water emulsion, have only in the sewage oil in water emulsion content less than 30mg/L, dissolving 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 water, oil in water emulsion removal effect, so need carries out air supporting after the oil removal and handle.To be the micro-bubble that utilizes high dispersing remove to adhere to the suspended substance 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 in water emulsion of the finely divided oil and the overwhelming majority.Using at present more in the refinery oily water treatment is pressure dissolved air floatation, cavitation flotation and jet flotation.The cavitation flotation machine 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 flotation process 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 air flotation pool), be depressurized release and produce microbubble by reliever, this microbubble at the volley with sewage in suspended substance 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 suspended substance in the former water.Device generally is furnished with complicated setting such as force (forcing) pump, air compressor, ejector, high pressure dissolving, reliever, 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, facility investment, capital construction and operation and maintenance cost height, and dwell time of sewage is long etc.
At the deficiency of aforesaid 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, swirler can be installed at any angle; Work is continuous, reliable, convenient operating maintenance efficient height; Adaptability is good, and operation and regulation range are wide etc.
Simultaneously, cyclonic separation also has weak point: because the certain shearing action of mobile generation of swirler inner fluid, if parameter designing is improper, easily drop (oil droplet or water droplet) is smashed and caused emulsification and worsen sepn process; Owing to handle the swirler that material of different nature often needs different structure size or operational condition, the versatility of cyclonic separation operation is relatively poor.In a word, the oil-water mixture of different crude oils often has different rerum naturas, and therefore, the swirler that is used for different quality often can not exchange use.
Common swirler is the column hydrocyclone, treatment effect for oil slick, dispersed oil is relatively good, but the removal effect for oil in water emulsion still is poor, and the strong point of flotation unit is that processing efficiency to oil in water emulsion is than higher, technology maturation is reliable, but more poor for coming in the water oil-contg than condition with higher adaptability, can see that thus swirler and flotation unit respectively have characteristics, deficiency is respectively arranged.On the other hand, from the oily(waste)water complicated component of domestic refinery, wish that the processing that utilizes the alternative flotation unit of swirler to be used for oily(waste)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 oily water separation.1993, J.P.Beeby and S.K.Nicol carried out the research of concentrated water external 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 oily(waste)water, and under the situation of flooding velocity 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 swirler, limit wall aerating by swirler, the flow performance of dissolved air floatation and hydrocyclone is combined, its application in the oily water separation field is more still being studied the exploratory stage, treatment effect and operational condition, and the selection of device parameter still will be subjected to the particular case 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 suitability 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 pre-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 treatment scheme, oil content of wastewater after this art breading is reached below the 30mg/L, suspended substance 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 density oily(waste)water that each device of refinery is produced enters transfer line through after being forced into 0.2～0.3MPa, in transfer line, add emulsion splitter, make it with pressurized oily(waste)water jointly through static mixer or venturi mixer and in pipeline, keep to enter one-level inflation hydrocyclone after 15～25 seconds and implement oily water separation, isolated oils composition is overflowed by top and enters the slop oil tank recovery, and the oily(waste)water after the rough purification is overflowed by the bottom and enters the sewage surge tank; Described emulsion splitter is the polyacrylamide emulsion splitter, and it is neutral substantially, and molecular weight is 600 ten thousand～700 ten thousand, and the emulsion splitter dosage is 0～20 mg/litre treatment sewage;
The described oily(waste)water of discharging through the sewage surge tank adds coagulating agent in transfer line, utilize the thorough mixing of pump class realization medicament and sewage and be forced into 0.2～0.3MPa, add coagulant aids after making this sewage of sneaking into coagulating agent in pipeline, keep 20～25 seconds reaction times, the input secondary was inflated hydrocyclone after this sewage that has added coagulating agent and coagulant aids passed through static mixer or venturi mixer, and control this effluent stream cross described mixing tank 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 swirler top and forms scum silica frost realization removal, water outlet is overflowed by the bottom becomes pretreated water, for further implementing biochemical treatment.
According to pretreatment technology provided by the invention, before each installs and enters one-level inflation hydrocyclone after the high density oily(waste)water (former water) that produces compiles with the refinery, can add an amount of emulsion splitter earlier according to oil-containing situation wherein, with the oily(waste)water thorough mixing and in pipeline, keep certain hour (15～25 seconds) and be beneficial to the breakdown of emulsion of realization to sewage, this reaction times decides on oil in water emulsion in the sewage and ss suspended solid content, enters one-level inflation hydrocyclone then and implements oily water separation.Character at oil refining sewerage, the present invention can add an amount of polyacrylamide earlier and strengthen sewage is implemented breakdown of emulsion as emulsion splitter, when removing oil slick, reclaim most of oil in water emulsion and dispersed oil in the sewage as far as possible, this emulsion splitter 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 in water emulsion content is low to moderate that 150mg/ rises or when following, the dosage of emulsion splitter is 0～10 mg/litre treatment sewage in the transfer line in the described oily(waste)water that produces from each device of refinery.If when oil in water emulsion content was higher than 150mg/ and rises in the described oily(waste)water that produces from each device of refinery, the dosage of emulsion splitter was 10～20 mg/litre treatment sewages in the transfer line.
The method according to this invention, handle through the preliminary oily water separation 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 coagulating agent respectively and coagulant aids is built bridge, net is caught etc., make suspended substance and remaining oil content (petroleum-type) in the water form bigger flco, enter the further purifying treatment of secondary inflation hydrocyclone then.Can use conventional coagulating agent and coagulant aids this moment, for example, coagulating agent can be aluminium salt system or molysite based flocculating agent (aluminum chloride, aluminium iron polychloride, aluminium chlorohydroxide, calcium aluminate etc.), coagulant aids then can be acrylamide polymer FO4190SH, FO4440SH, the polyacrylamide medicaments such as FO4800, FO4190PG of company (French SNF), the concrete dosage of coagulating agent and coagulant aids all can be according to routine operation, preferably, the dosage of coagulant aids and coagulating agent 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 impeller pump or other transferpump), this is come water to add emulsion splitter 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 oily water separation and emulsion splitter and sewage the abundant contact reacts 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 coagulating agent, 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 impeller pump, the effect of mixing that the sewage of sneaking into coagulating agent 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 coagulating agent and sewage sufficient reaction time; Simultaneously, line mixer also is set in the pipeline, this mixing tank can be static mixer or venturi mixer, sewage also need add coagulant aids before entering mixing tank, thorough mixing for sewage behind realization and the coagulation, the time that the effluent stream piping mixing tank that control has added coagulant aids enters secondary inflation hydrocyclone is 15～25 seconds (flow velocity and the duct length of control sewage), in the reaction times of build bridge, net being caught, makes the formation of sewage PetroChina Company Limited. class oil content and suspended substance 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 oily(waste)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 part 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 support equipment being used for that the high density oily(waste)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 swirler respectively, for example, any one-level cyclonic separation can be the series connection of two groups or three groups swirlers, to reach the treatment effect of expection.For the oily(waste)water of special property, the inflation hydrocyclone (water outlet of second cyclone enters next stage or multistage swirler again) more than secondary also can be set, reach the water quality standard of refinery oilfield sewage field biochemical treatment to guarantee water outlet.
Structure and principle of work 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 a perforated tube, 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 rare gas elementes) " squeezes " from the hole of outside chuck by wall under certain pressure and goes into the flow field, oily(waste)water enters under certain pressure along the tangential inlet of swirler 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 high speed rotating fluidic shearing action, hydrophobic particulate in the water (as oil droplet, suspended substance etc.) is collided mutually with bubble and is adsorbed, under centrifugal action, enter the foamy column at center, and then flow into upflow tube 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 perforated tube, and its mean pore size is 5 μ m, and percentage of open area is 30～50%, and wall thickness is 3mm, and air penetrability is 2～9 * 10
-3L/mincm
2MmH
2O, water body in swirler the residence time 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 residence time 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 in water emulsion, and detected 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 water treatment materialization section, can handle other high density oily(waste)waters again.Oil removal and/or the flotation of adopting the inflation hydrocyclone to substitute in the traditional technology are handled, occupation area of equipment is little, corresponding adjustment operational 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 diagrammatic cross-section that adopts the inflation hydrocyclone among the embodiment 2.
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.
See also Fig. 1, the high density oily(waste)water that each device of refinery produces in the pipeline that is sent to one-level inflation hydrocyclone 2 earlier by this pipeline on placed in-line impeller pump 12 be forced into 0.2～0.3MPa, add medicinal cupping 1 by emulsion splitter then and sneaked into an amount of emulsion splitter, maintain after making this pressurization sewage of sneaking into emulsion splitter 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 oily water separation on oil in water emulsion in the sewage and SS content, the used source of the gas of cyclonic 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 oil tank (not shown) and finishes recovery; Oily(waste)water is overflowed by the bottom and enters surge tank 13 after the rough purification.In this process, need basis to come the content of oil in water emulsion in the water that the emulsion splitter 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 treatment 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 swirler equipment is cylindrical.
In the middle and upper part of feed zone is feed-pipe 21, and sewage enters swirler from adopting the tangential admission mode here.The feed zone top design has upflow tube 22 and gland 23.Gland 23 outsides are connected with the feed zone screw top, and the inboard is threaded with upflow tube 22, can adopt the gland and the upflow tube 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 upflow tube 22 external diameters.
The flotation section is made of inside and outside two-layer cavity, the sintered titanium perforated tube that internal layer cavity 24 selects for use Beijing Non-Fervoous Metal Inst. to make, its mean 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 ' for the 1Cr18Ni9Ti stainless material make and with internal layer cavity 24 concentric bodys, the two forms interlayer (also claiming chuck), this interlayer one side setting and skin have the inlet pipe 25 of same material.For making air inlet even, inlet pipe 25 is two arms in wall punishment, divide two strands with air inlet, for preventing that air-flow is to the partial impact of perforated tube, the tube head of two arms of inlet pipe 25 is closed, and two arms stretch into sandwich portion radially upward to offering a plurality of even air inlet ports, air enters chuck by these air inlet ports.
Underflow section material is a plain carbon stool, 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.
Flow process and the on-the-spot pilot plant test of operating the employing multi-stage inflatable hydrocyclone 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 office.Designing treatment ability 5t/h; Reach the expection operating performance.
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 in water emulsion, dissolving 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 in water emulsion, and the emulsification degree is higher, thus present embodiment oily(waste)water to be processed belong to the difficult oily(waste)water of high oil-containing, high emulsification, high suspended matter.
Main water-quality guideline scope is as follows:
| Sequence number | Project | | Indication range | |
| 1 | Water temperature | ℃ | ＜38 | |
| 2 | pH | 6-9 | ||
| 3 | Oil | mg/L | 800-1000 | |
| 4 | CODcr | mg/L | 1000-2500 | |
| 5 | Suspended substance (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 density oily(waste)water that each device produces is forced into 0.3MPa through impeller pump 12, and in this water pipeline, add emulsion splitter simultaneously according to setting flow, make the two realize thorough 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 oil tank and is recovered; Oily(waste)water after the rough purification is overflowed by bottom underflow pipe 28 and enters surge tank 13.
The water outlet of surge tank 13 is stirred the thorough mixing of realizing medicament and sewage and is pressurized to 0.3MPa through impeller pump 14 impellers jointly with the coagulating agent that is added in the pipeline, reaction adds coagulant aids after about 25 seconds in pipeline, flow through static mixer or venturi mixer 15, and enter secondary inflation hydrocyclone 3 through hydraulic pipe-line, this effluent stream is crossed mixing tank 15 and was entered in secondary inflation hydrocyclone 3 processes control reaction about 20 seconds, with finish bridge formation, net is caught; Suspended substance 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 swirler top and forms scum silica frost realization removal, water outlet is overflowed 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 emulsion splitter, dosage is 15 mg/litre treatment sewages; Coagulating agent is a Tai-Ace S 150, and dosage is 150mg/L, and coagulant aids is the French SNF FO4800 of company water conditioner, 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 perforated tube, and its mean pore size is 5 μ m, and voidage is 30～50%, thickness 3mm, air penetrability 2～9 * 10
-3L/mincm
2MmH
2O; In this treating processes water body in swirler the residence time all less than 1 second.
Through the effect of above-mentioned pretreatment technology 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, suspended substance 1000～3000mg/L, effluent quality is basicly stable after the secondary cyclonic separation, oil-containing (petroleum content) is lower than 30mg/L, average 600～the 800mg/L of CODcr, suspended substance is lower than 90mg/L, can directly enter biochemical section fully and carry out subsequent disposal;
Can think that the present invention can solve the handling problem of sewage PetroChina Company Limited. class, COD, suspended substance, replace conventional materialization treatment scheme.
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 hydrocyclone technical finesse oil refining sewerage in alkene division department of Ba Ling petrochemical industry limited liability company.Designing treatment ability 5t/h; Reach the expection operating performance.
Alkene division department of Ba Ling petrochemical industry limited liability company is based on processing paraffinic base light crude, and water quality is better, and oil slick in the former water, dispersed oil content are higher, oil in water emulsion, dissolving 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 emulsion splitter before the one-level inflation hydrocyclone at the character of this oil refining sewerage.
Pump into secondary inflation hydrocyclone behind one-level inflation hydrocyclone water outlet and coagulating agent and the coagulant aids thorough mixing and carry out purifying treatment, can use conventional coagulating agent and coagulant aids (identical with embodiment 3) this moment, and the dosage of coagulant aids and coagulating agent is respectively 1.0 milligrams of every liter of treatment sewages and 100 milligrams.
This pretreatment technology is to the effect of sewage disposal:
(oil in water 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, suspended substance 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, suspended substance is lower than 60mg/L, can directly enter biochemical section fully and carry out subsequent disposal.
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 hydrocyclone technical finesse oily(waste)water in the laboratory.Designing treatment 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 oleaginousness with tap water under the effect of TM50 type colloidal mill in the laboratory is the emulsification oily(waste)water of 400 mg/litre, and its oil droplet median size is below 10 μ m.
The oil droplet median size is measured and is adopted the full-automatic grain graininess analyser of Ku Erte (COULTERMULTISTZERII), useful range 0.4～1200 μ m.OIL420 type Infrared Oil Determination Instrument is adopted in the measurement of oil-contg.
The emulsification oily(waste)water of preparation is implemented the description of the idiographic flow operation of processing referring to embodiment 1.At the character of this oily(waste)water, add emulsion splitter (identical) before the one-level inflation hydrocyclone with embodiment 3, dosage is 15 mg/litre treatment sewages.
Pump into secondary inflatable cyclonic separator behind separator water outlet of one-level inflatable cyclonic and coagulating agent and the coagulant aids thorough mixing and carry out purifying treatment, can use conventional coagulating agent and coagulant aids (identical with embodiment 3) this moment, and the dosage of coagulant aids and coagulating agent is respectively 1.0 milligrams of every liter of treatment sewages and 100 milligrams.
This pretreatment technology 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 median size is less than 10 μ m; Effluent quality is basicly stable, and on average about 15mg/L～30mg/L, the oil droplet median size 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 hydrocyclone contains dispersed oil sewage in the laboratory.Designing treatment ability 2.5t/h; Gas-liquid volume ratio is 3, and experiment effect is good.
Utilizing 0# diesel oil and tap water to prepare oleaginousness under the impeller pump shearing action in the laboratory is the oily(waste)water based on dispersed oil of 1000 mg/litre, and its oil droplet median size is at 27 μ m.
The oil droplet median size is measured and is adopted the full-automatic grain graininess analyser of Ku Erte (COULTERMULTISTZERII), useful range 0.4～1200 μ m.OIL420 type Infrared Oil Determination Instrument is adopted in the measurement of oil-contg.
The oily(waste)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 oily(waste)water, one-level inflation hydrocyclone does not add emulsion splitter.
Pump into secondary inflatable cyclonic separator behind separator water outlet of one-level inflatable cyclonic and coagulating agent and the coagulant aids thorough mixing and carry out purifying treatment, can use conventional coagulating agent and coagulant aids (identical with embodiment 3) this moment, and the dosage of coagulant aids and coagulating agent is respectively 1.0 milligrams of every liter of treatment sewages and 100 milligrams.
This pretreatment technology 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 median size 27 μ m; Effluent quality is basicly stable, and on average about 15mg/L～30mg/L, the oil droplet median size is less than 4 μ m for petroleum content.
Claims (8)
1. method that adopts multi-stage inflatable cyclonic technical finesse oil refining sewerage comprises following process:
The oily(waste)water that each device of refinery is produced enters transfer line after being forced into 0.2～0.3MPa, in transfer line, add emulsion splitter, 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 oily water separation with pressurized oily(waste)water, isolated oils composition is spilled over to slop oil tank by top and reclaims, oily(waste)water after the rough purification is overflowed by the bottom and enters the sewage surge tank, described emulsion splitter is a polyacrylamide, it is neutral substantially, molecular weight is 600 ten thousand～700 ten thousand, and the emulsion splitter dosage is 0～20 mg/litre treatment sewage;
The described oily(waste)water of discharging through the sewage surge tank adds coagulating agent in transfer line, utilize the thorough mixing of pump class realization medicament and sewage and be forced into 0.2～0.3MPa, add coagulant aids after making this sewage of sneaking into coagulating agent in pipeline, keep 20～25 seconds reaction times, the input secondary was inflated hydrocyclone after this sewage that has added coagulating agent and coagulant aids passed through static mixer or venturi mixer, and controlling this effluent stream, to spend the time that described mixing tank enters secondary inflation hydrocyclone be 15～25 seconds, sewage is after the processing of second cyclone, flco in the sewage is overflowed by swirler top and forms scum silica frost realization removal, water outlet is overflowed by the bottom becomes pretreated water, for further implementing biochemical treatment.
2. method according to claim 1, wherein, oil in water emulsion content is low to moderate that 150mg/ rises or when following, the dosage of emulsion splitter is 0～10 mg/litre treatment sewage in transfer line in the described oily(waste)water that produces from each device of refinery.
3. method according to claim 1, wherein, when oil in water emulsion content was higher than 150mg/ and rises in the described oily(waste)water that produces from each device of refinery, the dosage of emulsion splitter was 10～20 mg/litre treatment sewages in transfer line.
4. method according to claim 1, wherein, the dosage of coagulant aids and coagulating agent 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 perforated tube, and its mean pore size is 5 μ m, and percentage of open area is 30～50%, wall thickness 3mm, air penetrability 2～9 * 10
-3L/mincm
2MmH
2O; Sewage in swirler the residence time 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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| CN100525926C CN100525926C (en) | 2009-08-12 |
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