• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    ABSTRACT A purification system for purification of slop oil and industrial emulsions, said system comprising: - at least one slop oil centrifugal separator (5) into which slop oil is provided forseparation of water and oil; - at least one emulsion centrifugal separator (25) into which an industrial emulsionis provided for separation of oil and water; - a first redirecting fluid connection (37, 37') arranged for transferring oil separatedfrom the industrial emulsion in the emulsion centrifugal separator (25) to the slop oil centrifugal separator (5) possibly via a slop oil tank (3). (Figure 1) 13
    公开号:SE1650627A1
    申请号:SE1650627
    申请日:2016-05-10
    公开日:2017-11-11
    发明作者:Persson Thomas；Sundström Fred；Ajnefors Fredrik
    申请人:Recondoil Sweden Ab；
    IPC主号:
    专利说明:

    Purification of slop oil and industrial emulsions TECHNICAL FIELD OF THE INVENTION The present invention relates to a method and a system for purification of slop oil and industrial emulsions.
    BACKGROUND OF THE INVENTION Purification of oils, such as for example slop oil and waste oil is important for the possibilityto reuse oils and therefore an important factor for the environmental future and the limitednature resources of oils. Purification of slop oil is problematic in many ways. Slop oil cancomprise oil, water, particles and emulsions. The particles can stabilize the emulsions andcomplicate a purification process. Purification of industrial emulsions comprising water and oil, such as for example cutting fluids is also an important environmental issue.
    SUMMARY An object of the present invention is to improve efficiency in purification processes for slop oils and industrial emulsions.
    This is achieved in a method for purification of slop oil and industrial emulsions comprisingtwo processes run in parallel, a slop oil purification process and an industrial emulsion purification process, the slop oil purification process comprising the steps of: - providing slop oil to a slop oil centrifugal separator; - separating water and oil in the slop oil centrifugal separator;the industrial emulsion purification process comprising the steps of: - providing an industrial emulsion to an emulsion centrifugal separator; - separating oil and water in the emulsion centrifugal separator; - forwarding the oil separated in the emulsion centrifugal separator to be further processed in the slop oil purification process. lt is also achieved in a purification system for purification of slop oil and industrial emulsions, said system comprising: - at least one slop oil centrifugal separator into which slop oil is provided forseparation of water and oil; - at least one emulsion centrifugal separator into which an industrial emulsion isprovided for separation of oil and water; - a first redirecting fluid connection arranged for transferring oil separated fromthe industrial emulsion in the emulsion centrifugal separator to the slop oil centrifugal separator possibly via a slop oil tank.
    Hereby the slop oil purification process and the industrial emulsions purification process canbe combined in the same system and be used for further purification of end productsretrieved from the other process. Hereby quality will be improved in end products retrievedfrom the system and effectivity in the purification processes will be increased. Overall an improved purification process for slop oil and industrial emulsions will be achieved. ln one embodiment of the invention the method further comprises the step of adding a firstchemical booster to the slop oil before it is provided to the slop oil centrifugal separator.Possibly also the industrial emulsion purification process further comprises the step ofadding a second chemical booster to the industrial emulsion before it is provided to the emulsion centrifugal separator.Hereby separation efficiency can be improved. ln one embodiment the slop oil purification process further comprises the step of forwardingwater separated out from the slop oil in the slop oil centrifugal separator to be furtherprocessed in the industrial emulsion purification process. Thus the purification systemfurther comprises a second redirecting fluid connection arranged for transferring waterseparated out from the slop oil in the slop oil centrifugal separator to the emulsion centrifugal separator possibly via an industrial emulsions tank.
    Hereby also the water separated out from the slop oil in the slop oil purification process can be further purified by use of the industrial emulsion purification part ofthe system.
    Further embodiments of the invention are described in the dependent claims.
    BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 shows schematically a system for purification of slop oil and industrial emulsions according to one embodiment of the invention.
    Figure 2 shows schematically a system for purification of slop oil and industrial emulsions according to one embodiment of the invention.
    Figure 3 shows a flow chart of a method according to one embodiment ofthe invention.
    DETAILED DESCRIPTION OF THE El/lBODIl/IENTS Figure 1 shows schematically a purification system 1 for purification of slop oil and industrialemulsions according to one embodiment of the invention. The purification system accordingto the invention can handle two processes in parallel, a slop oil purification process and anindustrial emulsions purification process. The term slop oil as used in this text and in theclaims is meant to cover different mixes of oil, water, solid impurities and emulsion phase ofoil and water. Waste oil is another term commonly used. The term industrial emulsions asreferred to in the text and in the claims of the present patent application is meant to coverindustrial emulsions of water and oil, such as for example cutting fluids. The slop oilpurification process part of the system comprises at least one slop oil tank 3 in which slop oilto be purified is provided. The number of slop oil tanks can be varied in dependence ofthewanted capacity of the system. The slop oil purification process part of the system 1comprises further at least one slop oil centrifugal separator 5 into which slop oil is providedfor separation of water and oil. A first fluid connection 7 is hereby provided between the atleast one slop oil tank 3 and the at least one slop oil centrifugal separator 5. An oil tank 9 is also shown connected to the slop oil centrifugal separator 5 for the storing of the separated oil retrieved therefrom after the centrifugal process. Hereby also a second fluid connection 11 is provided between the slop oil centrifugal separator 5 and the oil tank 9.
    The industrial emulsions purification process part of the purification system comprises atleast one industrial emulsions tank 23 in which industrial emulsions of water and oil to bepurified is provided. The number of industrial emulsions tanks can be varied in dependenceof the wanted capacity of the system. This part of the system 1 comprises further at leastone emulsion centrifugal separator 25 into which the industrial emulsions is provided forseparation of oil and water. A third fluid connection 27 is hereby provided between the atleast one industrial emulsions tank 23 and the at least one emulsion centrifugal separator25. A water tank 29 is also shown connected to the emulsion centrifugal separator 25 for thestoring of the separated water retrieved therefrom after the centrifugal process. Hereby alsoa fourth fluid connection 31 is provided between the emulsion centrifugal separator 25 and the water tank 29 According to the invention the purification system further comprises a first redirecting fluidconnection 37 arranged for transferring oil separated from the industrial emulsion in theemulsion centrifugal separator 25 to one ofthe at least one slop oil tanks 3 for further purifying in the slop oil purification part of the system.
    According to one embodiment ofthe invention water retrieved from the separation of slopoil in the slop oil centrifugal separator 5 can be transferred to one ofthe at least oneindustrial emulsions tanks 23 for further purifying in the industrial emulsion purificationprocess part ofthe system. Hereby a second redirecting fluid connection 39 can be providedbetween an outlet of the slop oil centrifugal separator 5 and one of the at least oneindustrial emulsions tanks 23. This step is however an optional step of the invention. lnanother embodiment of the invention the water separated from the slop oil in the slop oil centrifugal separator 5 may instead be transferred to a water tank 30.
    Figure 2 shows schematically a system 1' for purification of slop oil and industrial emulsionsaccording to another embodiment ofthe invention. ln this embodiment a few more optionalparts of the system are shown. However the basic parts: slop oil tank 3, industrial emulsionstank 23, slop oil centrifugal separator 5, emulsion centrifugal separator 25, the oil tank 9, the water tank 29 and most ofthe fluid connection named and numbered in relation to Figure 1 are the same also in this embodiment and will therefore also be named and numbered in accordance with the system described in Figure 1. ln this embodiment ofthe invention there is provided a first booster adding means 51arranged for providing a first chemical booster to the slop oil in the at least one slop oil tank3. Such a first chemical booster could also be added to the slop oil in the slop oil tank 3 ofthe embodiment shown in Figure 1. The first chemical booster can be in the form of ademulsifier which can destabilize an emulsion phase in the slop oil and facilitate separationof water and solids and/or salts from the oil. The use of a chemical booster can improve theseparation effectivity. By waiting and possibly warming the slop oil tank 3 the separation ofoil, water and contaminating particles in the slop oil will start already in the slop oil tank 3. lnthis embodiment another type of centrifugal separator will be provided before the slop oilcentrifugal separator 5 as described in relation to Figure 1. This is a decanter centrifugeseparator 55 which is connected to an outlet of the slop oil tank 3. This decanter centrifugeseparator 55 will separate contaminating particles and sludge from the slop oil. A particleand sludge tank 57 is provided connected to the decanter centrifugal separator 55 for thecollection ofthe contaminating particles and sludge separated from the slop oil. The oilwhich after the decanter centrifugal separator has been purified from contaminatingparticles and sludge is forwarded to a second slop oil tank 59. This oil will be furthertransferred from the second slop oil tank 59 for further purification in the slop oil centrifugalseparator 5. Possibly a chemical booster can be added also in the second slop oil tank 59 forfurther improving separation effectivity. Water which is separated from the oil in the slop oilcentrifugal separator 5 can as described in relation to Figure 1 be transferred through asecond redirecting fluid connection 39 to the industrial emulsions tank 23 for furtherpurification in the emulsion purification part of the process or alternatively to a water tank30. Oil retrieved after centrifugal separation in the slop oil centrifugal separator 5 will be transferred to an oil tank 9. ln another embodiment ofthe invention the oil retrieved after the decanter centrifugalseparator 55 can instead be transferred back to one of the initial slop oil tanks 3 for furthertreating with chemical booster and warming before it is taken to the decanter centrifugal separator 55 a second time. ln the industrial emulsions purification process part of the system most parts are the sameas described in relation to the embodiment described in Figure 1. However a second boosteradding means 61 is here shown connected to the industrial emulsions tank 23 arranged forproviding a second chemical booster to the industrial emulsion before it is provided to theemulsion centrifugal separator 25. The second chemical booster can be a water cleaningproduct which will improve the separation of oil contaminants from water. This is anoptional part of the process which also could be provided to the embodiment shown inrelation to Figure 1. Furthermore the oil retrieved after separation in the emulsioncentrifugal separator 25 is transferred through a first redirecting fluid connection 37' to thesecond slop oil tank 59 for further purification in the slop oil purification process part of thesystem. Hereby, the oil retrieved from the industrial emulsion purification process will beautomatically transferred for further purification in the slop oil purification part of theprocess and the end product will be a better purified oil. With this combined purification a more effective purification is achieved and a better quality ofthe end product.
    The transferring of slop oil, industrial emulsions, oil and water in the system as described inrelation to Figure 1 and 2 requires a number of pumps. A person skilled in the art wouldunderstand where to provide the pumps for achieving the flows as described above. Pumpscan also be provided for recirculating the contents inside the tanks, for example the contentin the slop oil tanks 3 and the industrial emulsions tanks 23 for improving mixing of addedchemical booster in the content of the tanks. The pumps can for example be displacement pumps or mono pumps.
    The tanks in the system can also in one embodiment of the invention be provided withheating means for heating the tanks. The heating means can for example be steam coilsprovided inside the tanks. Heating the content in the tanks can improve separationeffectivity. The viscosity of the oils will be lowered for higher temperatures and that willfacilitate separation. Furthermore density differences between oil and water can be increased by heating which will be advantageous for separation. ln Figure 2 one more optional feature ofthe invention is shown. This is a redirectionarrangement 41 which can be provided in a fluid line at different positions in the system. ln Figure 2 it is shown at two different positions actually in the first and second redirection fluid connections 37', 39 but it could be provided also in other positions. This redirectionarrangement 41 could also be provided for example in the first and second redirection fluidconnections 37, 39 in the embodiment shown in Figure 1. The redirection arrangement 41comprises a sensor 43 arranged to be provided in a fluid line, a three way valve 45 arrangedto be provided in the same fluid line and further connected to another fluid line and acontrol system 47 connected to both the sensor and the three way valve 45 and arranged tocontrol the three way valve 45 in dependence of sensor output. The sensor 43 is arrangedfor sensing properties of the fluid in the fluid line where it is provided such that fluidautomatically can be directed to a proper destination in dependence of the sensor output. lnthe embodiment shown in Figure 2 the redirection arrangement 41 is provided in the firstredirection fluid connection 37'. An extra fluid line 49 is hereby provided in the systemconnected to one of the valve connections in the three way valve 45 of the redirectionarrangement 41. This extra fluid line 49 is also connected to the at least one industrialemulsions tank 23. Hereby it is possible to redirect fluid coming from the emulsioncentrifugal separator 25 on its way to the slop oil processing part of the system (the secondslop oil tank 59) back to the industrial emulsions tank 23 if the sensor 43 detects water ordetects that the oil content of the fluid is too low. A further redirection arrangement 41 is inFigure 2 shown to be provided in the second redirection fluid connection 39. An extra fluidline 52 is thus also provided connected to one of the valve connections of the three wayvalve and to the second slop oil tank 59 for making it possible to redirect fluid coming fromthe slop oil centrifugal separator 5 back to the second slop oil tank 59 if the sensor of theredirection arrangement 41 detects oil or detects that the oil content is too big in the fluidon its way to the industrial emulsion processing part ofthe system (industrial emulsions tank23). The sensors could for example be a sensor measuring dielectric differences ofthe fluid.Such a sensor could be based on capacitive or microwave measurement technology. Anothertype of sensor that could be used is a sensor measuring density via a vibrating fork. Other types of sensors are also possible.
    This redirection arrangement 41 could also be connected to a warning system providing analarm signal or even providing an automatic stop of the centrifuge operation if oil is detected in the water outlet from the slop oil centrifugal separator 5. The redirection arrangement 41 could also be connected to a control system reducing the flow into the centrifugal separator if oil is detected in the water outlet.
    Figure 3 shows a flow chart of a method according to one embodiment ofthe invention. Themethod steps are described below. There are two processes run in parallel, a slop oilpurification process, described by some or all ofthe steps S1-S13 and an industrial emulsion purification process, described by some or all ofthe steps A1-A9.The slop oil purification process: S1: Adding a first chemical booster to the slop oil which is provided in a slop oil tank 3. This step is optional in the process.
    S3: Warming the slop oil by warming the slop oil tank 3 in which the slop oil is provided andinto which the chemical booster possibly has been provided. The warming ofthe slop oilpossibly together with the chemical booster will improve separation efficiency. This step is optional in the process.
    S5: Providing the slop oil to a decanter centrifuge 55 for separating particles and sludge fromthe slop oil. This step is optional in the process. |fthe content of particles and sludge in the oil to be purified is low the decanter centrifuge may not be necessary.
    S7: Providing the partly purified slop oil to a second slop oil tank 59 and providing the sludge and particles to another tank.
    S9: Providing the partly purified slop oil from the second slop oil tank to a slop oil centrifugal separator 5 for separating water and oil.
    S11: Forwarding water separated out from the slop oil in the slop oil centrifugal separator 5to be further processed in the industrial emulsion purification process. This step is optional in the process.The industrial emulsion purification process: A1: Adding a second chemical booster to the industrial emulsion which is provided in an industrial emulsions tank 23. This step is optional in the process.
    A3: Warming the industrial emulsion by warming the industrial emulsion tank 23 in whichthe industrial emulsion is provided and into which the chemical booster possibly is provided.The warming ofthe emulsion possibly together with the chemical booster will improve separation efficiency. This step is optional in the process.
    A5: Providing the industrial emulsion to an emulsion centrifugal separator 25 for separating oil and water.
    A7: Forwarding the oil separated in the emulsion centrifugal separator 25 to be further processed in the slop oil purification process.
    A9: An optional step of sensing a property ofthe oil separated in the emulsion centrifugalseparator 25 on its way to the slop oil tank 3 and possibly redirecting the oil back to theindustrial emulsions tank 23 (the beginning of the industrial emulsion purification process)can also be provided. A sensor is provided in the fluid line and an output from the sensor canbe indicative of the content of the fluid, for example if the content is oil or water or if oil orwater content is below a certain threshold. This was described above in relation to Figures 1and 2 and was called redirection arrangement 41. Such a redirection arrangement can beprovided in more positions of the system. For example also after step S11 for sensing S13 ifthe water forwarded to the industrial emulsion purification process comprises a correctamount of water or if it should be directed back for further purification in the slop oil purification process instead.
    The method according to the invention comprises two parallel purification processes whichcan be combined. Hereby oil retrieved from the industrial emulsion purification process willbe automatically transferred for further purification in the slop oil purification process. Bycombining these two processes the efficiency in purification and the quality of end products are improved.
    权利要求:
    Claims (12)
    [1] 1. CLAll/IS 1. A method for purification of slop oil and industrial emulsions comprising twoprocesses run in parallel, a slop oil purification process and an industrial emulsionpurification process, the slop oil purification process comprising the steps of: - providing slop oil to a slop oil centrifugal separator (5); - separating water and oil in the slop oil centrifugal separator (5);the industrial emulsion purification process comprising the steps of: - providing an industrial emulsion to an emulsion centrifugal separator (25);- separating oil and water in the emulsion centrifugal separator;- forwarding the oil separated in the emulsion centrifugal separator to be further processed in the slop oil purification process.
    [2] 2. A method according to claim 1, wherein the slop oil purification process furthercomprises the step of adding a first chemical booster to the slop oil before it is provided to the slop oil centrifugal separator (5).
    [3] 3. A method according to claim 1 or 2, wherein the industrial emulsion purificationprocess further comprises the step of adding a second chemical booster to the industrial emulsion before it is provided to the emulsion centrifugal separator (25).
    [4] 4. A method according to any one ofthe claims 1-3, wherein the slop oil purificationprocess further comprises the step of providing the slop oil to a decanter centrifuge(55) for separating particles and sludge from the oil before the step of providing the slop oil to a slop oil centrifugal separator (5).
    [5] 5. A method according to any one of the claims 1-4, wherein the slop oil purificationprocess further comprises the step of forwarding water separated out from the slopoil in the slop oil centrifugal separator (5) to be further processed in the industrial emulsion purification process.
    [6] 6. 8. 9. A method according to any one of the preceding claims, further comprising the stepsof: - sensing a property ofthe oil separated in the emulsion centrifugal separator and- directing the oil to the slop oil purification process or back to the industrial emulsion purification process in dependence of the sensed property. A purification system for purification of slop oil and industrial emulsions, said system comprising: - at least one slop oil centrifugal separator (5) into which slop oil is provided forseparation of water and oil; - at least one emulsion centrifugal separator (25) into which an industrial emulsionis provided for separation of oil and water; - a first redirecting fluid connection (37, 37') arranged for transferring oil separatedfrom the industrial emulsion in the emulsion centrifugal separator (25) to the slop oil centrifugal separator (5) possibly via a slop oil tank (3). A purification system according to claim 7, further comprising a first booster addingmeans (51) arranged for providing a first chemical booster to the slop oil before it is provided to the slop oil centrifugal separator (5). A purification system according to claim 7 or 8, further comprising a second boosteradding means (61) arranged for providing a second chemical booster to the industrial emulsion before it is provided to the emulsion centrifugal separator (25). 10. A purification system according to any one of the claims 7-9, further comprising a decanter centrifugal separator (55) into which the slop oil is provided before it isprovided into the at least one slop oil centrifugal separator (5), said decantercentrifugal separator (55) being arranged to separate particles and sludge from the slop oil. 11 11. A purification system according to any one of the claims 7-10, further comprising asecond redirecting fluid connection (39) arranged for transferring water separatedout from the slop oil in the slop oil centrifugal separator (5) to the emulsion centrifugal separator (25) possibly via an industrial emulsions tank (23). 12. A purification system according to any one of the claims 7-11, further comprising aredirection arrangement (41) provided in the first redirecting fluid connection (37;37'), said redirection arrangement comprising a sensor (43) arranged for sensing aproperty ofthe oil separated in the emulsion centrifugal separator and saidredirection arrangement (41) being arranged to direct the oil either to the slop oilcentrifugal separator (5) possibly via a slop oil tank (3) or back to an industrial emulsions tank 23 in dependence ofthe sensed property. 12
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1650627A|SE539859C2|2016-05-10|2016-05-10|Method and system for purification of slop oil and industrial emulsions comprising two processes run in parallel|SE1650627A| SE539859C2|2016-05-10|2016-05-10|Method and system for purification of slop oil and industrial emulsions comprising two processes run in parallel|
    PCT/SE2017/050454| WO2017196234A1|2016-05-10|2017-05-08|Method and system for purification of slop oil and industrial emulsions comprising two processes run in parallel|
    EP17796488.9A| EP3454960B1|2016-05-10|2017-05-08|Method for purification of slop oil and industrial emulsions comprising two processes run in parallel|
    CN201780028888.1A| CN109661260B|2016-05-10|2017-05-08|Method and system for purifying dirty oil and industrial emulsions comprising two parallel operating methods|
    JP2019512600A| JP6998940B2|2016-05-10|2017-05-08|Slop oil and industrial emulsion refining methods and refining systems involving parallel execution of two steps|
    US16/301,348| US11130075B2|2016-05-10|2017-05-08|Method and system for purification of slop oil and industrial emulsions comprising two processes run in parallel|
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