CN101607149A - Intelligent response control electrical desalting and dewatering device and control method - Google Patents
Intelligent response control electrical desalting and dewatering device and control method Download PDFInfo
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Abstract
The present invention relates to a kind of intelligent response control electrical desalting and dewatering device and control method, belong to the crude Treatment technical field.This device comprises and is used for that battery lead plate provides the dedicated transformer of electric energy and is placed in the oil-water emulsion instrument that is used to measure oil-water emulsion situation in the tank body in the electric desalting and dewatering jar in the electric desalting and dewatering jar, power supply connects described dedicated transformer through the PLC controller, the signal input part of the measured signal output termination PLC controller of oil-water emulsion instrument.This method disperses the mode of section, mixer, accumulation section, settling section to provide voltage to battery lead plate by the control of PLC controller with slow liter section, the section of making zero, the fast liter.The present invention can be when crude oil and working condition change, emulsification degree according to medium in the tank body makes the high pressure that outputs on the electric desalting and dewatering tank body inner high voltage battery lead plate be fit to the oil-water emulsion situation more, avoid breaking down, guarantee equipment long period even running under various operating modes.
Description
Technical field
The present invention relates to a kind of Dewatering and Desalting Technologies of Crude Oil, especially a kind of intelligent response control electrical desalting and dewatering device and control method belong to the crude Treatment technical field.
Background technology
Crude oil is extremely complicated hydrocarbon mixture, different oil fields, different oil district, even often not different with oil property that oil well produces, wherein moisture and storage, transportation, processing and the final products etc. that contain salt pair crude oil all have adverse effect, therefore will carry out desalination and processed.
The desalting and dewatering of crude oil generally carries out at twice.For the first time after the crude oil extraction, carry out dewatering and desalting, water content and salt content are tentatively reduced, outwards carry again after reaching certain index in the oil field.For the second time be Crude Oil Transportation behind oil plant, before refining, carry out.
At present, the electro-desalting method of extensive use mainly contains three kinds: first kind is traditional alternating current desalination, adopts two-layer or three layers of horizontal electrode plate, lower floor's pole plate energising, upper strata pole plate ground connection.Second kind is the alterating and direct current desalination, be arranged in order along the tank body axis direction by the positive and negative formula battery lead plate that hangs from above, form to exchange weak electric field, direct current weak electric field, direct current highfield from bottom to top, comprehensively bring into play alternating current and promote that big water droplet is built up, direct current promotes the coalescent usefulness of fine liquid particles (be 93246305.3 Chinese patent) referring to application number.Crude oil, water, the emulsion that demulsifier is formed is in aqueous phase enters electrical desalter, through after the flushing of water layer, at first enter the interchange weak electric field, in exchanging weak electric field, electric charge per second on the electrode changes several times, cause the shape of water droplet and the corresponding change in oscillation of charge polarity, the emulsifying film that surrounds water droplet is broken, thereby water droplet can be interosculated become big water droplet from oil phase, to settle down, the conductance of medium reduces greatly simultaneously, create favourable current field condition for entering top direct current highfield, avoided the generation of battery lead plate puncture or short circuit accident; In DC electric field, the little water droplet generation electrophoresis of two ends, polarization back band opposed polarity, the water droplet collision probability of the water droplet of horizontal direction electrophoresis and vertical sedimentation increases greatly like this, promotes the coalescent sedimentation of water droplet again.The third is the high speed electro-desalting, and why the high speed electro-desalting can improve treating capacity, and key is to have taked oil phase oil-feed mode, can not produce stirring to the jar bottom aquifer, can not influence the stable of profit circle position, and the assurance of even running is provided for oil-feed speed; Shortened oily flow path greatly, crude oil no longer is slowly to float from aqueous phase, but directly enters tank body middle and upper part electric field, and the shortening of oily flow path has reduced the time of staying of oily stream in tank body greatly, has improved oil-feed speed; And the design of double-deck nozzle has guaranteed to have the crude oil of q.s to spray into reposefully in the electric field, and rationally distributes in electric field.
In recent years, the unstability in oil supply market or the concuss of crude oil price, increased the crude refining cost greatly, for adapting to the version in crude oil market, reduce the crude oil processing cost, the refinery often purchases or mixes and refine some crude oil with poor quality, though these crude oil with poor quality have reduced purchase cost, but make that the crude oil of character complexity is more complicated originally, bring challenges for the even running of refining equipment, particularly in the processing high specific gravity, high viscosity, high salinity, during the crude oil with poor quality of high acid value, be easy in the electro-desalting tank body, emulsification take place, generate the stable emulsion that is difficult to abolish at the oil-water interfaces place, in equipment running process, short circuit occurs, report to the police, situations such as unit trip situations such as electric difficulty or high voltage electric field short circuit occur sending when serious, influence the electric desalting apparatus even running.And, take off the back water content in crude oil and often be higher than 0.2% technical indicator, salt content also is difficult to reach the standard-required of 3mg/l, and particularly electro-desalting draining is because emulsification takes place in the tank body, the timely reasonable crude oil of working properties, the situation that the draining oil-containing exceeds standard also often occurs, be higher than 200ppm far away, even the draining oil content reaches several thousand ppm, even the situation of several ten thousand ppm, increased the pressure of the sewage disposal in downstream greatly.
To this, above-mentioned prior art is all powerless.Retrieval is found, application number is 93246305.3,01201735.3,200610091044.5,200710054331.3,93102196.0 Chinese patent application and US6,113,765, US86,105, the U.S. Patent application of 817A improves above-mentioned prior art respectively, but therefore the electro-desalting piezoelectric voltage control mode that does not all break traditions can not substantially solve a series of problems that oil quality deterioration brings to refining equipment.
In addition; in traditional electric desalting equipment, alternating current desalting technology no matter, the power supply of 100% whole impedance explosion-proof transformer as electric desalting equipment all adopted in alterating and direct current desalination and high speed electro-desalting; this power supply has designed a reactor at primary coil, is playing effect aspect the protection power supply.But, change at processed complex crude oil or processing operating mode, when particularly forming the obstinate emulsion of high conductivity; be the protection power-supply device; the high pressure that outputs in the electro-desalting tank body reduces gradually, usually is reduced to the degree that can not abolish emulsification under the serious situation, as shown in Figure 2.This situation makes the emulsification aggravation on the contrary, that is to say that 100% traditional whole impedance electro-desalting power supply has been sacrificed the breakdown of emulsion desalting and dewatering effect of high voltage electric field in order to protect transformer frequency response equipment when emulsification takes place.The full curve (referring to Fig. 2) that is traditional whole impedance electro-desalting piezoelectric voltage and electric current output in the above-mentioned prior art is the non-suitable profile of setting up consistent electric field on the electrode plate with high voltage of complex working condition, the also non-ideal curve of finishing electric desalting and dewatering.
Summary of the invention
Purpose of the present invention primarily is: a kind of intelligent response control electrical desalting and dewatering device that can adjust the processing operating mode according to various crude oil automatically is provided, thereby guarantee that electrical desalting and dewatering device all the time can stable operation, avoid operation problems such as pole plate puncture, short circuit, tripping operation.
Further aim of the present invention is: set up the intelligent response electric desalting and dewatering control method that consistent electric field helps to guarantee the electric desalting and dewatering quality thereby propose a kind of battery lead plate of electrical desalting and dewatering device that can make under complex working condition.
In order to reach above-mentioned primary and foremost purpose technical scheme of the present invention be: a kind of intelligent response control electrical desalting and dewatering device, comprise and be used for the dedicated transformer that in electric desalting and dewatering jar battery lead plate provides electric energy, also comprise and be placed in the oil-water emulsion instrument that is used to measure oil-water emulsion situation in the tank body in the electric desalting and dewatering jar, power supply connects described dedicated transformer through the PLC controller, the signal input part of the measured signal output termination PLC controller of described oil-water emulsion instrument.
Like this, in the electric desalting and dewatering process, can the situation of crude oil emulsion in the tank body be fed back to the PLC controller in real time by the oil-water emulsion instrument, adjust the input voltage of electric desalting and dewatering dedicated transformer again according to the emulsification situation by the PLC controller, thereby change transformer output is input to the voltage in the electric desalting and dewatering jar inner high voltage electric field, make the high pressure that outputs on the electric desalting and dewatering tank body inner high voltage battery lead plate be fit to the oil-water emulsion situation more, avoid occurring short circuit, faults such as tripping operation, guarantee the even running of electric desalting apparatus, fundamentally solve a series of problems that oil quality deterioration brings to refining equipment.
In order to reach further purpose, on the basis of technique scheme, the present invention also proposes a kind of electric desalting and dewatering control method, controls described dedicated transformer by providing electric-field intensity with the battery lead plate of next stage in the electric desalting and dewatering jar by described PLC controller:
Phase I is the slow section that rises, and rises to first predetermined value gradually by being initially zero in first scheduled time;
Second stage is the section of making zero, and the electric-field intensity moment that rises to first predetermined value revert to zero, and keeps for second scheduled time;
Phase III is that fast the liter disperseed section, makes to revert to zero electric-field intensity and rise to second predetermined range that is higher than first predetermined value rapidly;
The quadravalence section is a mixer, electric-field intensity is remained on second predetermined range with the 3rd scheduled time;
Five-stage is for building up section, gradually the electric-field intensity of second predetermined range is reduced to the 3rd predetermined range with the 4th scheduled time;
The 6th stage was a settling section, with the 5th scheduled time electric-field intensity was remained on and revert to zero after the 3rd predetermined range.
Facts have proved, control electrode plate like this, even under complex working condition, also making its electric field that forms in tank body, also corresponding to rise, make zero, rise soon dispersion, mixing, coalescent and six stages of sedimentation be one-period with slow, thereby can set up the electric field of working stability, make equipment be able to normal operation, guarantee the quality of electric desalting and dewatering.
In a word, the invention has the beneficial effects as follows: when crude oil that the refinery processed and working condition change, the high-tension electricity that intelligent response control electrical desalting and dewatering device can be adjusted according to the emulsification degree of medium in the situation of working conditions change and the tank body, make the high pressure that outputs on the electric desalting and dewatering tank body inner high voltage battery lead plate be fit to the oil-water emulsion situation more, solve in the process accidents such as the electric desalting and dewatering transformer tripping operation that occurs, short circuit that change because of crude oil and working condition.Guarantee under the effect of intelligent response control electrical desalting and dewatering technical equipment, in salt content of crude oil during in the 100mg/l left and right sides, water content in crude oil reaches and is not more than 0.2% technical indicator after taking off, salt content eases down to the technical indicator less than 2mg/l, the draining oil-containing is not more than the technical indicator of 100ppm, guarantee equipment under various operating modes, the long period even running.
Description of drawings
Fig. 1 is the control principle figure of one embodiment of the invention.
Fig. 2 is the curve map of prior art whole impedance electro-desalting electric power output voltage and electric current.
Fig. 3 is the stressed schematic diagram of oil-water interfaces place water droplet.Wherein G is a gravity, and F is a dielectric field force viscous force, and E is an electric field force, and P is a dipolar forces.
Fig. 4 controls the voltage waveform figure of output for Fig. 1 embodiment.
Fig. 5 is the process flow system figure of Fig. 1 embodiment.
Among the figure: 1, switch cubicle, 2, the PLC electronic control cabinet, 3, touch control flow, 4, on-the-spot explosive operation cabinet, 5, the electric desalting and dewatering jar, 6, the electric desalting and dewatering dedicated transformer, 7, low liquid level safety switch, 8, profit circle position instrument, 9, the emulsification detector, 10, cut water regulating valve, 11, mixing valve, 41, crude oil storage tank, 42, the fresh water storage tank, 43, the demulsifier storage tank, 44, receive the cooling storage tank, 45, the demulsifier injection pump, 46, crude oil pump, 47, the one-level water injecting pump, 48, the secondary water injecting pump, 49, heater, 410, temperature controller, 412, the one-level blender, 413, the one-level mixing valve, 414, the one-level draining valve, 415, one-level is mixed difference gauge, 416, the one-level electrical desalter, 417, single stage desalting is controlled power supply with intelligent response, 418, one-level is taken off back crude oil thief hatch, 419, one-level jar emulsion thief hatch, 422, the secondary blender, 423, the secondary mixing valve, 424, the secondary draining valve, 425, secondary mixing difference gauge, 426, the secondary electrical desalter, 427, the secondary desalination is controlled power supply with intelligent response, 428, secondary takes off back crude oil thief hatch, 429, secondary jar emulsion thief hatch.
The specific embodiment
Referring to accompanying drawing 1, the intelligent response control electrical desalting and dewatering device of present embodiment has man-machine interface, electric desalting technology and Power Electronic Technique and automatic control technology are combined, by the PLC electronic control cabinet, according to the operating mode of technology of electric de-salting process, output changes the high voltage electric field of adjusting, and makes electric desalting equipment and technology of electric de-salting operating mode form intelligent response control, reach equipment and technology operation optimization and cooperate, thereby reach best desalting and dewatering effect.Wherein, 1 design of panel switches cabinet is in power distribution station, and the power cable that is installed in the electric desalting and dewatering dedicated transformer 6 on the electric desalting and dewatering jar 5 directly is routed to electric desalting and dewatering dedicated transformer 6 from switch cubicle 1.PLC electronic control cabinet 2 designs that contain the PLC controller are used to judge the situation of crude oil emulsion in the electro-desalting tank body in the control room, and adjust electric desalting and dewatering dedicated transformer 6 voltages according to the emulsification situation by touch control flow 3.
During normal the operation, the bottom is a water layer in electric desalting and dewatering jar 5, and top is oil reservoir, and high voltage electric field designs in oil phase, therefore has a profit circle position in tank body, is the emulsion layer of crude oil and water more than the profit circle position.When processing light-end products operating mode preferably under the situation, the oil-water emulsion layer is thinner, generally at 1～2cm, the electric desalting equipment running current is smaller, when the processing crude oil with poor quality, or during the high moisture emulsified crude oil of processing crude oil storage tank bottom, emulsion layer will be built up at place, profit circle position, form water content than the higher obstinate emulsion layer that is difficult to breakdown of emulsion.This emulsion layer conductance is than higher, in the control room design and installation behind the PLC electronic control cabinet 2, in case the emulsification situation takes place in the electric desalting and dewatering jar 5, it is abominable that operating mode becomes, the emulsification detector 9 at tank body top will feed back to the actual emulsification situation of tank body in the PLC switch board, emulsification for example takes place in the tank body, electric current has the phenomenon of rising, surpass predefined current value, the signal that electric current raises will be sent to PLC, carry out data judgement and analysis at PLC, and output is adjusted the information command of voltage to the silicon-controlled voltage regulation device, by reducing the voltage that thyristor operating angle reduces to output to the former limit of transformer, thereby reduced the transformer output voltage, the high pressure on the battery lead plate makes the voltage on the electrode plate with high voltage controlled after reducing, thereby changed that in a single day the tank body internal emulsification appears in the traditional electrical desalter and the situation of can not adjusting of taking place and control appliance operation, guaranteed that equipment is in the optimized high voltage electric field to move always.That is to say that intelligent response control electrical desalting and dewatering device can be fit to the adjustment of working conditions change at the situation output of oil-water emulsion in the tank body.Design on-the-spot explosive operation cabinet 4 in device context, be used for the scene personnel that patrol and examine equipment operation condition is carried out on-the-spot supervision and check.Electric desalting and dewatering jar 5 is provided with low liquid level safety switch 7; the respective input of its output termination PLC controller; thereby make PLC electronic control cabinet 2 and switch cubicle 1 form chain electic protection, prevent from tank body, to occur flammable explosive gas and occur explosion accident occurring under the electric situation of misdelivery.The output of the profit circle position instrument 8 on the electric desalting and dewatering jar 5 also connects the respective input of PLC controller, the control output end of PLC controller connects mixing valve 11 on electric desalting and dewatering jar 5 feed line and the controlled end of cutting water regulating valve 10 on the flowing line respectively, therefore two valves can be realized control automatically at PLC electronic control cabinet 2, have 485 interface channels to realize information sharing and transmission smoothly simultaneously and between user's the DCS.
In addition, in traditional electric desalting technology,, often design several taps, be divided into several gears in Circuit Fault on Secondary Transformer for adjustment is transported to high pressure on jar interior battery lead plate, as 13kV, 16kV, 19kV, 22kV, 25kV, 30kV or the like.During operation, be set on the output gear, in this case, the water droplet at place, profit circle position is stressed also to be fixed, and is a kind of poised state.The water droplet stressing conditions as shown in Figure 3.At first water droplet is subjected to a gravity, and downward movement tendency arranged, because of the water droplet that exists of viscosity of crude is subjected to the crude oil viscous force that direction makes progress, the dielectric field force that also is subjected to dipolar forces and is subjected to electric field because of water droplet is electrically charged between adjacent water droplet secondly, water droplet is subjected to the electric field force of high voltage electric field once more.Under the effect of these several power, the fine liquid particles at oil-water interfaces place is in the state of relatively stable balance.In this state, fine liquid particles will constantly be built up, and at some emulsifiers that add that water droplet itself is intrinsic, form stable oil-water emulsion layer.For breaking this metastable balance of water droplet, present embodiment is by carrying the high-tension electricity of the suitable profit circle position place's emulsification situation that changes on the battery lead plate of PLC electronic control cabinet 2 in electric desalting and dewatering jar 5, break water droplet institute stress balance by changing the suffered electric field force of oil-water interfaces place's fine liquid particles, thereby reach the effect of abolishing emulsification.When being short-circuited, can setting the highest operation restriction electric current, and can cut off transformer output high pressure automatically; realize overcurrent protection, the electric current output of limiting transformer possesses again the design of soft start power supply simultaneously; battery lead plate is steadily exported high pressure in jar once more, guarantees the foundation of high pressure consistent electric field.
Fig. 4 is preferred intelligent response control electrical desalting and dewatering electric power output voltage wavy curve figure, and this curve map is divided into slow liter section A, the section of a making zero B, fast liter disperses section C, a mixer D, builds up section E and six stages of settling section F.The slow section A that rises is to build up a lot of oil-water emulsions at place, profit circle position in the tank body with the section of making zero B, and form obstinate emulsion layer, contain a large amount of water in this emulsion layer, conductance can not directly apply very high voltage than higher, otherwise will occur puncturing or short circuit accident, therefore will apply a slow up voltage at the slow section A that rises, electric-field intensity based on crude emulsification degree can be adjusted, and adjusting range is at 0～150V/cm, time can be preferably 1～5s at 1～10s.For the low crude oil of the not serious conductance of emulsification higher electric-field intensity and short slow the liter time can be set; Crude oil for the obstinate emulsion layer that forms high-moisture can be provided with electric-field intensity on the low side and long slow the liter time.Even like this, electric current also may occur for the water content emulsion that very high conductivity is very strong and continue raise and to send electric situation of difficult, as to the processing of seagoing tanker washing of tanks oil emulsion the time, often this thing happens.The design of the section of making zero B is exactly the appearance that prevents this situation, will suspend the output high pressure in a short period of time, breaks the water droplet stress balance of formation by the cancellation electric field force.The time of the section of making zero B can be controlled in 1～5s, is preferably 1～2s.Guarantee that by the slow design that rises section A and the section of making zero B high-tension electricity can be transported on the electrode plate with high voltage in the electric desalting and dewatering jar 5, sets up stable electric field.
The fast liter disperseed a section C, and the voltage that is applied on the electrode plate with high voltage is sharply risen, make electric-field intensity reach 4500V/cm above (between 4500～6000V/cm, preferred 4500～5000V/cm), reach water droplet carries out electrodispersion under the high voltage electric field effect degree.After slow liter section A and the section of making zero B processing, the low still high crude oil emulsion of conductance of conductance is all guaranteed the foundation of high voltage electric field, then in the fast electric-field intensity of disperseing section C high voltage electric field to be increased to needed water droplet electrodispersion that rises, general require fast rise disperse section C time between 1～5s, be preferably 1～3s.
Mixer D, keep the highest electric-field intensity at this section, make the water droplet in the crude oil emulsion under the effect of high voltage electric field power, carry out being segmented to greatest extent and spreading, be broken into a lot of tiny water droplets, the easiest being penetrated in the crude oil of desalination water that segmented this moment, these fine liquid particles and crude oil are fused together, and the salinity in the crude oil is dissolved in the water droplet like this.The electric-field intensity of this mixer D designs between 4500～6000V/cm, preferred 4500～5000V/cm, and the time of mixer D can be controlled in 1～5s, is preferably 1～2s.
Build up section E, electric-field intensity is changeed the weak stage, make little particle water be incorporated into bigger particle, just needing to reduce electric-field intensity makes and to finish in the dissolving crude oil fine liquid particles of salt at mixer D and build up into big water droplet, the needed time of this process is longer relatively, and this is because the time that fine liquid particles is built up is depended on the character of crude oil and the situation of emulsification.Therefore, this time period can be controlled in 1～30s, is preferably 1～10s, and electric-field intensity designs between 350～800V/cm, preferred 350～550V/cm.
Settling section F, that passes through electric-field intensity reduces fine liquid particles after an accumulation section E builds up into big water droplet, owing to the reason of weight sinks to pelagic division very soon, but part granule depositing in water reduction of speed degree still is slow, therefore, this this section also needs the electric field force a little less than in the of, promotes the accumulation of part granule water droplet.This electric-field intensity promptly can not make big water droplet carry out electrodispersion to break part granule water droplet is accumulated, and therefore, the electric-field intensity of settling section is a lower stable electric-field intensity.Because this section water droplet is bigger, water content is than higher, and the electric-field intensity of this settling section F designs between 350～800V/cm, preferred 350～550V/cm, and the time of mixer D can be controlled in 1～5s, is preferably 1～2s.
Referring to accompanying drawing 5, be the intelligent response control two-stage electric desalting and dewatering experimental provision technological process of this case embodiment: the crude oil that is adopted in the experiment is high specific gravity, high viscosity, and the lu ning pipeline transportation of crude oil inferior of high salinity, the proportion that crude oil is 25 ℃ are 0.9344g/cm
3, 50 ℃ dynamic viscosity 260mPa.s, crude oil desalting content 116.85mg/L, water content 1.43%, this crude oil is in process, and running current is big, emulsification easily, regular generation electro-desalting power source trip accident, equipment fluctuation of service.
During experiment crude oil is joined in the crude oil storage tank 41, crude oil will be carried out and be preheating to about 60 ℃ in crude oil storage tank 41, be transported in the experimental provision by crude oil pump 46.Oil flow is 60L/h, pressure and flow measurement and control system have been designed in the exit of crude oil pump, heater 49 is used for heating in crude oil to needed desalting and dewatering temperature, this temperature is generally at 130～145 ℃, be higher than general electric desalting and dewatering operating temperature, and this operating temperature is one of key factor that influences the desalting and dewatering effect, must accurately control, therefore, designed the efficiency of heating surface that temperature controller 410 is used for control heater 49 in the exit of heater 49, to guarantee needed design temperature.The same with the commercial plant flow process, crude oil demulsifier is configured at demulsifier storage tank 43, demulsifier is an oil-soluble demulsifier, and determining that by static demulsifier competition experiment model is SX2603, is injected into the inlet of crude oil pump 46 through demulsifier injection pump 45 before, make demulsifier reach the effect of preliminary mixing through the conveying of crude oil pump 46, the fresh water that is used for the desalinization of soil by flooding or leaching then will join fresh water storage tank 42, and water injection rate is 5% of crude charging capacity, i.e. 3L/h.Be injected in the first order desalination system through one-level water injecting pump 47.After demulsifier and fresh water are injected in the system, must carry out fully mixing with crude oil, with the salinity in the dissolving crude oil to greatest extent, whole process is to realize by the one-level blender 412 and the one-level mixing valve 413 of design on pipeline, mixing intensity is the mixing pressure reduction at one-level blender 412 and one-level mixing valve 413 two ends just, can regulate by mixing valve 413, the setting of mixing intensity and measurement mix difference gauge 415 in one-level and can realize.Behind one-level blender 412 and one-level mixing valve 413, crude oil in the system, fresh water and demulsifier have just been realized abundant mixing, guarantee that the salinity in the crude oil is dissolved in the fresh water, pass through the effect of one-level blender 412 and one-level mixing valve 413 simultaneously, also formed the metastable emulsion of crude oil, water and demulsifier.This emulsion enters one-level electrical desalter 416 under the high voltage electric field effect, carries out breakdown of emulsion, realizes water-oil separating.Power supply on the one-level electrical desalter 416 is that single stage desalting is controlled power supply 417 with intelligent response, and the slow setting-up time that rises section A is 2s.The setting-up time of the section of making zero B is 1s, and the fast setting-up time that rises dispersion section C is 2s.The setting-up time of mixer D is 2s.The setting-up time of building up section E is 5s.The setting-up time of settling section F is 2s, and forming one-period is the cycle period of 14s.On one-level electrical desalter 416 outlet lines, can sample by the crude oil that one-level is taken off after 418 pairs of processes of back crude oil thief hatch one-level is taken off.One-level electrical desalter 416 lateral layout three fixed sample mouths 419, be used in the tank body particularly the crude oil at profit circle position place sample, investigate the emulsification degree of oil-water interfaces and moisture mensuration etc.The crude oil of finishing the single stage desalting dehydration will enter second level desalting and dewatering system, and the water of deviating from is discharged from the one-level draining valve 414 of one-level electrical desalter 416 bottoms, and the quantitative analysis of draining oil-containing is carried out in sampling.Before entering secondary electrical desalter 416, also need to add fresh water in crude oil, this is injected in the system by secondary water injecting pump 48, is retained in the crude oil because demulsifier is the oil-soluble breakdown of emulsion always, therefore no longer adds demulsifier in the system of the second level.With first order desalting and dewatering similar process, crude oil and water pass through secondary blender 422 and secondary mixing valve 423, and realize mixing the second time of crude oil and water by secondary mixing difference gauge 425, and the salinity in the crude oil is further transferred in the fresh water.On secondary electrical desalter 416, setup parameter is identical with the first order with the design of intelligent response control power supply in the secondary desalination, that is: the slow setting-up time that rises section A is 2s.The setting-up time of the section of making zero B is 1s, and the fast setting-up time that rises dispersion section C is 2s.The setting-up time of mixer D is 2s.The setting-up time of building up section E is 5s.The setting-up time of settling section F is 2s, and forming one-period is the cycle period of 14s.By secondary take off back crude oil thief hatch 428 sample analysis through the two stage desalting processed after the salt content and the water content of crude oil, secondary jar emulsion thief hatch 429 sides of tank body side be used in the tank body particularly the crude oil at profit circle position place sample, investigate the emulsification degree of oil-water interfaces and moisture mensuration etc.The water of deviating from is discharged by the secondary draining valve 424 of secondary desalter bottom, and takes a sample and carry out the quantitative analysis of draining oil-containing, and the crude oil after the processing will enter into and receive cooling storage tank 44.In the experiment, stable equipment operation, current stabilization big fluctuation do not occur between 0.4～0.5A, can effectively eliminate the emulsification situation in the tank body, and draining is clear.Reach as the following table technical indicator through behind the intelligent response control electrical desalting and dewatering:
Claims (9)
1, a kind of intelligent response control electrical desalting and dewatering device, comprise and be used for the dedicated transformer that in electric desalting and dewatering jar battery lead plate provides electric energy, it is characterized in that: also comprise being placed in the oil-water emulsion instrument that is used to measure oil-water emulsion situation in the tank body in the electric desalting and dewatering jar, power supply connects described dedicated transformer through the PLC controller, the signal input part of the measured signal output termination PLC controller of described oil-water emulsion instrument.
2. intelligent response control electrical desalting and dewatering device according to claim 1 is characterized in that: described electric desalting and dewatering jar also is provided with low liquid level safety switch, the respective input of the output termination PLC controller of described low liquid level safety switch.
3. intelligent response control electrical desalting and dewatering device according to claim 2, it is characterized in that: described electric desalting and dewatering jar also is provided with profit circle position instrument, described profit circle position instrument output also connects the respective input of PLC controller, and the control output end of described PLC controller connects mixing valve on the electric desalting and dewatering jar feed line and the controlled end of cutting water regulating valve on the flowing line respectively.
4. according to the control method of the described intelligent response control electrical desalting and dewatering device of claim 1, it is characterized in that: control described dedicated transformer by providing electric-field intensity with the battery lead plate of next stage in the electric desalting and dewatering jar by described PLC controller:
Phase I is the slow section that rises, and rises to first predetermined value gradually by being initially zero in first scheduled time;
Second stage is the section of making zero, and the electric-field intensity moment that rises to first predetermined value revert to zero, and keeps for second scheduled time;
Phase III is that fast the liter disperseed section, makes to revert to zero electric-field intensity and rise to second predetermined range that is higher than first predetermined value rapidly;
The quadravalence section is a mixer, electric-field intensity is remained on second predetermined range with the 3rd scheduled time;
Five-stage is for building up section, gradually the electric-field intensity of second predetermined range is reduced to the 3rd predetermined range with the 4th scheduled time;
The 6th stage was a settling section, with the 5th scheduled time electric-field intensity was remained on and revert to zero after the 3rd predetermined range.
5. according to the control method of the described intelligent response control electrical desalting and dewatering device of claim 4, it is characterized in that: described slow electric-field intensity first predetermined value that rises section is 150V/cm, and described first scheduled time is 1～10s, is preferably 1～5s.
6. according to the control method of the described intelligent response control electrical desalting and dewatering device of claim 5, it is characterized in that: described second scheduled time of the section of making zero is 1～5s, is preferably 1～2s.
7. according to the control method of the described intelligent response control electrical desalting and dewatering device of claim 5, it is characterized in that: it is between 4500～6000V/cm that described fast liter disperses electric-field intensity second predetermined range of section, preferred 4500～5000V/cm, the 3rd scheduled time of described mixer is at 1～5s, is preferably 1～2s.
8. according to the control method of the described intelligent response control electrical desalting and dewatering device of claim 5, it is characterized in that: described the 4th scheduled time of building up section is 1～30s, be preferably 1～10s, the 3rd predetermined range of electric-field intensity is between 350～800V/cm, preferred 350～550V/cm.
9. according to the control method of the described intelligent response control electrical desalting and dewatering device of claim 5, it is characterized in that: the 5th scheduled time of described settling section is preferably 1～2s for being controlled at 1～5s.
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| CN103446780A (en) * | 2013-08-27 | 2013-12-18 | 洛阳瑞铭石化技术有限公司 | Operation method of electrostatic field oil-water separation system |
| CN110205158A (en) * | 2019-05-31 | 2019-09-06 | 青岛贝索科技有限公司 | The control method of electro-desalting ultrasonic wave |
| CN110358574A (en) * | 2019-07-19 | 2019-10-22 | 中国石油工程建设有限公司北京设计分公司 | A kind of multistage return mixes the de- system and method for electricity |
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| CN103446780A (en) * | 2013-08-27 | 2013-12-18 | 洛阳瑞铭石化技术有限公司 | Operation method of electrostatic field oil-water separation system |
| CN103446780B (en) * | 2013-08-27 | 2015-08-05 | 洛阳瑞铭石化技术有限公司 | A kind of method of operating of electrostatic field oil-water separation system |
| CN110205158A (en) * | 2019-05-31 | 2019-09-06 | 青岛贝索科技有限公司 | The control method of electro-desalting ultrasonic wave |
| CN110205158B (en) * | 2019-05-31 | 2021-07-23 | 青岛贝索科技有限公司 | Method for controlling ultrasonic wave for electric desalting |
| CN110358574A (en) * | 2019-07-19 | 2019-10-22 | 中国石油工程建设有限公司北京设计分公司 | A kind of multistage return mixes the de- system and method for electricity |
| CN113429999A (en) * | 2021-07-29 | 2021-09-24 | 长江三星能源科技股份有限公司 | Electric desalting and electric dehydrating device with remote monitoring and fault diagnosis functions |
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Address after: 212200 No. 2 CLP Road, Jiangsu, Yangzhong Patentee after: Samsung energy Polytron Technologies Inc Address before: 212200 No. 2, CLP Road, Yangzhong Development Zone, Jiangsu Patentee before: Changjiang (Yangzhong) Electric Desalting Equipment Co., Ltd. |
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Application publication date: 20091223 Assignee: JIANGSU SANXING ENERGY EQUIPMENT CO., LTD. Assignor: Changjiang (Yangzhong) Electric Desalting Equipment Co., Ltd. Contract record no.: 2017320000109 Denomination of invention: Intelligent response control electrical desalting and dewatering device and control method Granted publication date: 20110629 License type: Common License Record date: 20170504 |
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