CN101037612A - Crude oil pulsing electrical desalting technique - Google Patents
Crude oil pulsing electrical desalting technique Download PDFInfo
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- CN101037612A CN101037612A CN 200710054331 CN200710054331A CN101037612A CN 101037612 A CN101037612 A CN 101037612A CN 200710054331 CN200710054331 CN 200710054331 CN 200710054331 A CN200710054331 A CN 200710054331A CN 101037612 A CN101037612 A CN 101037612A
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Abstract
The invnetion discloses a impulse electric desalting and dewatering technology, after heating crude oil mixed with demulsifier and wash water entered into desalting pot with two grades, technical condition of the first grade of the electric desalting is: 3%-15% of water injection, pulse electric field strength is 800 v/cm-5000 v/cm in high-field, pulse frequency is 50 Hz-2000 Hz, duty ratio is 6%-50%; technical condition of the second grade of the electric desalting is: 3%-12% of water injection, pulse electric field strength is 1500 v/cm-5000 v/cm in high-field, pulse frequency is 50 Hz-2000 Hz, duty ratio is 0%-50%. After desalting and dewatering in this technical condition, salinity >=3.0 mg NaCl/L, water content >=0.3%, dewatering oilness >=100 mg/L of treated crude oil to deeply desalt. The technique is suit for electric desalting of light, middle and heavy crude oil with advantages of high efficiency, low cost and environmental protection, general desalting efficient is more than 95%, saving power about 60% comparing with ordinary electric desalting technique.
Description
Technical field
The invention belongs to petrochemical complex technology of electric de-salting technical field, what relate generally to is a kind of crude oil pulsing electrical desalting technique.Be adapted to the electric desalting process from the lightweight to heavy crude.
Background technology
In petroleum refining process, contained salt is the major cause that causes corrosion of equipment and fouling in the crude oil.Along with the heaviness of crude oil and improving constantly of the poor qualityization and the level of crude oil processing, downstream unit is had higher requirement to crude oil electric desalting, how to realize the crude oil advanced desalination by efficient means, is the developing direction of crude oil electric desalting technology.
Salt in the crude oil mainly exists with the form of basic metal and alkaline earth salt, and these salt major parts are enriched in the contained water of crude oil with the form of inorganic salt, and sub-fraction is suspended in the oil phase with particle form.In the contained water of crude oil, the bigger water in suspension of diameter is easier by static settlement separate; And the emulsified water that exists with form of emulsion, especially micron-sized emulsified water, though in electric field also difficulty or ease remove.In general, after separator oil has passed through dewatering process such as physics sedimentation, chemical demulsification and electric field breakdown of emulsion, water-content is less than 0.5%, at this moment, inorganic salt in the crude oil mainly are dissolved in the emulsified water, therefore, by screening suitable emulsion splitter, changing process meanses such as electric field form and intensity and remove micron water droplet in the oil phase, be the main path that realizes the advanced desalination of crude oil.The crude oil electric desalting equipment of active service both at home and abroad mostly is s-generation electric desalting technology, i.e. alternating current-direct current associating electric desalting technology.The outstanding problem that this technology exists is: the desalting effect to heavy crude is relatively poor; The sewage with oil height; The power consumption height, easily short circuit causes the electric desalting apparatus trip phenomenon.The second half nineties, along with the development of integrated circuit technique, high-power, high-voltage pulse power source cost reduces greatly, is that the third generation electrodesalting and electrodehydrating technological development of feature has obtained attention with the high-voltage pulse power supply mode.Theoretically, the breakdown of emulsion time of pulsing electrical desalting dehydration technique is short, and power consumption is low, can improve the efficient of desalting and dewatering.But crude oil electric desalting and dehydration have very big difference; End below 0.5%, as long as crude oil electric dewatering technology can be fallen W/O content to saliferous no requirement (NR) in the crude oil; Crude oil electric desalting technology then requires to take off the back salt content in crud oil and is not more than 3.0mgNaCl/l, and water-content is not more than 0.3%, takes off the back sewage with oil and is not more than 500mg/l; Therefore, the crude oil electric desalting technology is higher than electro-dewatering technical requirements, the technological process of more difficult realization.For the pulsing electrical desalting dehydration technique of the third generation, sewage with oil is subjected to influence of various factors such as strength of electric field, pulse-repetition, dutycycle, emulsion splitter model and consumption, washing water consumption to its ratio of desalinization with taking off afterwards, and these factors are not isolated to each other, also exist synergy between some factor.If it is improper that processing condition are selected, not only can influence desalting efficiency, and can cause the short circuit trip phenomenon because of excessive emulsification, make the electric desalting apparatus can't normal running.Therefore, Selection of technological conditions and optimize smooth running, the desalting efficiency of paired pulses electric desalting apparatus and take off the back oil content of wastewater very big influence is arranged.Existing pulsing electrical desalting dehydration technique mostly is static technology, what be primarily aimed at is the dehydrating of crude oil process, do not have special continous way pulsing electrical desalting technique and supporting with it processing condition, restricted of the application of pulsing electrical desalting reused water technique in the refining of petroleum industry at different crude oils.
In existing third generation pulsing electrical desalting dehydration technique, patent UA72285 and RU2174857 are the electro-dewatering technology, and strength of electric field is respectively and is not less than 5KV/cm and 40～80KV/cm; Experiment finds, when strength of electric field during greater than 5KV/cm, easily causes the crude oil second emulsifying, ratio of desalinization obviously reduced, and the oil content of wastewater of electric desalting apparatus is risen significantly, increased the difficulty of sewage disposal.RU2167692 adopts a kind of alternative pulsed electrical field, and pulse strength is 0.5～1KV/cm, is applicable to
The dehydration of water-oil emulsion, because the pulse field intensity is lower, desalting effect is undesirable.Chinese patent CN1358824, CN96202788 and CN95219078 are the high-frequency impulse apparatus for electrodewatering, are adapted to the electro-dewatering process of crude oil, do not relate to the technological process and the processing condition of crude oil electric desalting.
Summary of the invention
The object of the present invention is to provide a kind of crude oil pulsing electrical desalting technique.To adapt to the electric desalting process from the lightweight to heavy crude, reach and reduce the electric desalting power consumption and take off the back oil content of wastewater, improve ratio of desalinization and the equipment rate that operates steadily.
The present invention realizes that the technical scheme that above-mentioned purpose is taked is: after heating in crude oil and secondary electric desalting are cut water and emulsion splitter and mixed, enter the single stage desalting jar, in desalination temperature is 110 ℃～145 ℃, water injection rate is 3%～15%, high electric area pulsed electrical field intensity is 800V/cm～5000V/cm, pulse-repetition is 50Hz～2000Hz, and dutycycle is to carry out the single stage desalting dehydration under 6%～50% the processing condition, and isolating saliferous oily(waste)water is sent at the bottom of the jar and carried out sewage disposal; Taking off crude oil from tank deck effusive mixes once more with washing water (secondary water filling) and emulsion splitter, enter the secondary electrical desalter, in desalination temperature is 110 ℃～145 ℃, water injection rate 3%～12%, high electric area pulsed electrical field intensity is 1500V/cm～5000V/cm, pulse-repetition is 50Hz～2000Hz, and dutycycle is to carry out the secondary desalination under 0～50% the processing condition, and secondary is cut the water filling of water as the one-level electric desalting.
The present invention substitutes successive in the pulse power supply mode and exchanges or the direct current supply mode, and crude oil is carried out advanced desalination and dehydration.Electrical desalter that is adopted and off-set facility thereof can be utilized the existing conventional electric desalting apparatus fully, only its power pack are transformed, and change the whole impedance transformer and the Controlling System thereof of conventional electric desalting into pulse transformer and Controlling System thereof.The pulse power is formed (separate case is applied for a patent) by pulsing controller and whole impedance high frequency explosion-proof transformer, and it is installed in the operation room, and the high frequency explosion-proof transformer is installed on the electrical desalter.The power frequency component of input 380V is the pulse signal that requires through pulse generator controller commutation inversion, after cable is delivered to the high frequency explosion-proof transformer that places on the electrical desalter, after boosting to the needed voltage of technology of electric de-salting, be connected on the electrical desalter internal polar plate by high-tension cable.
As everyone knows, crude oil electric desalting is to rely on emulsified particle to be subjected to the acting in conjunction of electric field coalescence force, dielectric force and emulsion splitter and to reach the desalination purpose.Because the formed square topped pulse frequency adjustable of the pulse power can produce extremely narrow at interval rectangle electricimpulse according to processing requirement, applies an electric field on water solution of oil.The time compole of this electric field action is short, when electric field does not have enough time to puncture as yet, pulse just disappears, thereby can make impulse electric field strength be much higher than the common electrical desalination, obviously shortened the coalescent and settling time of water droplet, avoided conventional technology of electric de-salting because of producing the power source trip problem that " water chain phenomenon " causes, improved adaptability, reached the raising desalting efficiency, improved the purpose that stable equipment operation, reduction power consumption and emulsion splitter consume heavy crude.
Washing water of the present invention can be fresh water or Industrial cleaning facility water.For water saving, preferably adopt Industrial cleaning facility water, its PH=6～10; The saline sewage of secondary electric desalting can be used as the washing water of single stage desalting.The purpose of injecting washing water in the pulsing electrical desalting process is for the entrained inorganic salt of dissolving crude oil, reaches better desalting effect.Washing water are very few, are unfavorable for the inorganic salt dissolving; Washing water are too much, then increased energy consumption.Washing water consumption of the present invention is 3%～15% of a former oil mass.
Crude oil demulsifier is divided into oil soluble and water-soluble two kinds of forms, all can use in crude oil pulsing electrical desalting technique.The emulsion splitter that the present invention selects for use is a kind of commercially available oil-soluble demulsifier, and model is EC2425A.Because this technology can reduce the emulsion splitter consumption significantly, even fully without emulsion splitter, therefore, the model and the consumption of emulsion splitter be there is no particular requirement, but model that the character of based on crude is screened and consumption.
The temperature of electric desalting has bigger influence to desalting efficiency.Desalination temperature is too low, and the viscosity of crude oil is big, is unfavorable for oily water separation, and desalting efficiency descends; Desalination temperature is too high, and the operating pressure height of electrical desalter has increased the risk that energy consumption and equipment move.Electric desalting temperature of the present invention is 110 ℃～145 ℃.For density is 0.8g/cm
3～0.9g/cm
3Crude oil, desalination temperature is selected 110 ℃～135 ℃; For density greater than 0.9g/cm
3Heavy crude, desalination temperature is selected 135 ℃～145 ℃.
The impulse electric field strength of high electric area is one of key factor of decision ratio of desalinization, and the selected high electric area pulsed electrical field intensity of the present invention is 800V/cm～5000V/cm.It is undesirable to be lower than the 800V/cm desalting effect; Be higher than 5000V/cm and can cause crude oil and water second emulsifying, ratio of desalinization is reduced, oil content of wastewater obviously increases.
Pulse-repetition has certain influence to ratio of desalinization.Pulse-repetition is low, is unfavorable for the water solution of oil breakdown of emulsion, reduces ratio of desalinization; Pulse-repetition is too high, can produce second emulsifying.The selected pulse-repetition of the present invention is 50Hz～2000Hz.
Dutycycle is meant the ratio of shared time of pulse in the one-period and total time in this cycle.Dutycycle is low, and desalting effect is poor; Dutycycle is too high, easily produces " water chain phenomenon ", causes the power supply system tripping operation, and the power consumption of pulsing electrical desalting technique is increased.The selected dutycycle of the present invention is 6%～50%.
There is bigger influence the residence time of high electric area to desalting effect.The residence time of high electric area is too short, the oil-water mixture inferior separating effect, and ratio of desalinization is low; The oversize treatment capacity that can influence device again of the residence time.The high electric area residence time of used s-generation crude oil electric desalting technology is generally 10min～20min.Crude oil pulsing electrical desalting technique of the present invention, because de-emulsification speed is fast, the residence time of high electric area selects for use 1min～5min to get final product.
The main technique condition of one-level electric desalting of the present invention is: emulsion splitter consumption 0～15 μ g/g, preferred 5 μ g/g～10 μ g/g; One-level water injection rate 3%～15%, preferred 5%～10%; High electric area pulsed electrical field intensity is 800V/cm～5000V/cm, preferred 1500V/cm～4000V/cm; Pulse-repetition is 50Hz～2000Hz, preferred 500Hz～1500Hz; Dutycycle is 6%～50%, preferred 20%～50%; High electric area residence time 1min～5min.
Other main technique condition of secondary electric desalting of the present invention is: water injection rate 3%～12%, preferred 5%～9%; High electric area pulsed electrical field intensity is 1500V/cm～5000V/cm, preferred 2000V/cm～4500V/cm; Pulse-repetition is 50Hz～2000Hz, preferred 300Hz～1400Hz; Dutycycle is 0～50%, preferred 20%～40%; High electric area residence time 1min～5min.Because what adopt is oil-soluble demulsifier, the secondary electric desalting needn't add emulsion splitter again; If employing water-soluble demulsifier, secondary electric desalting still can add in the ratio of one-level electric desalting.
Crude oil pulsing electrical desalting technique proposed by the invention, under optimized process conditions, its total ratio of desalinization can reach more than 95%, takes off the saltiness ≯ 3.0mgNaCl/l of back crude oil, water content ≯ 0.3%, sewage with oil ≯ 100mg/L has reached the requirement of advanced desalination.Compare with common alternating-current desalting technology, can save the electric energy about 60%.
Description of drawings
Fig. 1 is the principle schematic of the special-purpose pulse power of the present invention and Controlling System thereof.
Fig. 2 is a pulsing electrical desalting principle of device synoptic diagram of the present invention.
Among the figure: 1, three phase worker power, 2, the pulsing controller, 3, cable, 4, electrical desalter, 5, the high frequency explosion-proof transformer, 6, high-tension cable, 7, grounding wire, 8, petroleum tank, 9, heating tank, 10, single stage desalting jar, 11, the secondary desalter, 12, crude oil pump, 13, one-level waterflood pump, 14, emulsion splitter pump, 15, the secondary waterflood pump, 16, mend water port; A, crude oil, B, secondary are cut water, C, emulsion splitter solution, D, secondary water filling, E, one-level emulsion splitter, F, secondary emulsion splitter, G, single stage desalting oil-water mixture, H, takes off crude oil, and I, two takes off crude oil, J, one-level oil-salts containing sewerage.
Embodiment
The invention will be further described below in conjunction with embodiment.
Present embodiment is on existing electrical desalter and off-set facility basis thereof, changes the whole impedance transformer and the Controlling System thereof of conventional electric desalting into pulse transformer and Controlling System thereof.The pulse power is made up of pulsing controller 2 and whole impedance high frequency explosion-proof transformer 5, and pulsing controller 2 is installed in the operation room, and high frequency explosion-proof transformer 5 is installed on the electrical desalter 4.The power frequency supply 1 of input 380V is the pulse signal that requires through pulse generator controller commutation inversion, be delivered to the high frequency explosion-proof transformer that places on the electrical desalter through cable 3, after boosting to the needed voltage of technology of electric de-salting, be connected to (as shown in Figure 1) on the electrical desalter internal polar plate by high-tension cable 6, for the unexpected electric leakage of anti-locking system, electricity is taken off jar 4 ground connection.That the special-purpose pulse power that is adopted can form is unidirectional, high pressure, high frequency, spike pulse, big pulse duration ratio electric field.Its significant parameter should meet following condition: input voltage is three-phase and four-line 380V, 50Hz; Specified voltage pulse output is 15-100KV, and is adjustable continuously; Pulse-repetition: 50～2000HZ, adjustable continuously; Dutycycle: 6-50%, adjustable continuously; Anti-hazard classification: INCREASEDSAFETY eII level.
As shown in Figure 2, the technical process of present embodiment is: enter crude oil pump 12 after filtering from the crude oil A of petroleum tank 8, oil density is 878.2Kg/m
3, salts contg is 98.5mgNaCl/l; By the crude oil of crude oil pump output with from the emulsion splitter solution E of emulsion splitter pump 14 with cut water B from one-level waterflood pump 13 secondarys and carry out thorough mixing.Emulsion splitter is an oil soluble, and model is EC2425A, and add-on is 0 μ g/g; Water injection rate is 3%.Single stage desalting oil-water mixture G is heated to 110 ℃ in heating tank 9 after, enter single stage desalting jar 10, in high electric area pulsed electrical field intensity is 1500V/cm, pulse-repetition is 50Hz, dutycycle is to carry out desalting and dewatering under 6% the processing condition, and isolated one-level oil-salts containing sewerage J discharges from the desalter bottom.Crude oil H behind the single stage desalting draws from single stage desalting jar top, and from the emulsion splitter F of emulsion splitter pump 14 with carry out secondary from the Industrial cleaning facility water of secondary waterflood pump 15 and mix, water filling is an Industrial cleaning facility water, PH=9.0, and secondary desalination water injection rate is 3%; The emulsion splitter add-on is 7.5 μ g/g, enter secondary desalter 11, in high electric area pulsed electrical field intensity is 1500V/cm, pulse-repetition is 50Hz, dutycycle is to carry out the secondary desalting and dewatering under 6% the processing condition, oil-salts containing sewerage B (secondary is cut water) discharges from desalter bottom, and two take off and are sent to atmospheric and vacuum distillation unit after crude oil I draws from secondary desalter top.If the water injection rate of single stage desalting is greater than or less than the water injection rate of secondary desalination, can effluxes or replenish by benefit water port 16.
Present embodiment desalting and dewatering effect sees the following form:
| Take off back saliferous/mgNaCll -1 | Total ratio of desalinization/% | Moisture after taking off/% | Sewage with oil/mgl -1 | |||
| One-level | Secondary | One-level | Secondary | One-level | Secondary | |
| 61.5 | 21.4 | 78.3 | 1.0 | 0.45 | 85.9 | 54.1 |
Production unit that present embodiment adopts and technical process are with embodiment 1.
Its oil density is 878.2Kg/m
3, salts contg is 98.5mgNaCl/l; Desalination temperature is 120 ℃; Emulsion splitter is an oil soluble, and model is EC2425A; Water filling is an Industrial cleaning facility water, PH=6.0.
Single stage desalting emulsion splitter add-on is 5 μ g/g, and water injection rate is 5%, and high electric area pulsed electrical field intensity is 2000V/cm, and pulse-repetition is 1000Hz, and dutycycle is 30%; Secondary desalination water injection rate is 5%, and high electric area pulsed electrical field intensity is 2000V/cm, and pulse-repetition is 1000Hz, and dutycycle is 30%.
Desalting and dewatering effect under this condition sees the following form.
| Take off back saliferous/mgNaCll -1 | Total ratio of desalinization/% | Moisture after taking off/% | Sewage with oil/mgl -1 | |||
| One-level | Secondary | One-level | Secondary | One-level | Secondary | |
| 39.5 | 6.5 | 93.4 | 1.29 | 0.63 | 52.7 | 51.2 |
Production unit that present embodiment adopts and technical process are with embodiment 1.
Its oil density is 878.2Kg/m
3, salts contg is 98.5mgNaCl/l; Desalination temperature is 135 ℃; Emulsion splitter is an oil soluble, and model is EC2425A; Water filling is an Industrial cleaning facility water, PH=8.0.
Single stage desalting emulsion splitter add-on is 10 μ g/g, and water injection rate is 7%, and high electric area pulsed electrical field intensity is 3000V/cm, and pulse-repetition is 2000Hz, and dutycycle is 50%; Secondary desalination water injection rate is 7%, and high electric area pulsed electrical field intensity is 3000V/cm, and pulse-repetition is 2000Hz, and dutycycle is 50%.Desalting and dewatering effect under this condition sees the following form.
| Take off back saliferous/mgNaCll -1 | Total ratio of desalinization/% | Moisture after taking off/% | Sewage with oil/mgl -1 | |||
| One-level | Secondary | One-level | Secondary | One-level | Secondary | |
| 11.6 | 6.7 | 93.2 | 0.13 | 0.25 | 96.7 | 70.4 |
Production unit that present embodiment adopts and technical process are with embodiment 1.
Its oil density is 878.2Kg/m
3, salts contg is 98.5mgNaCl/l; Desalination temperature is 130 ℃; Emulsion splitter is an oil soluble, and model is EC2425A; Water filling is an Industrial cleaning facility water, PH=10.0.
Single stage desalting emulsion splitter add-on is 0 μ g/g, and water injection rate is 7%, and high electric area pulsed electrical field intensity is 2000V/cm, and pulse-repetition is 1000Hz, and dutycycle is 50%; Secondary desalination water injection rate is 7%, and high electric area pulsed electrical field intensity is 2000V/cm, and pulse-repetition is 1000Hz, and dutycycle is 50%.Desalting and dewatering effect under this condition sees the following form.
| Take off back saliferous/mgNaCll -1 | Total ratio of desalinization/% | Moisture after taking off/% | Sewage with oil/mgl -1 | |||
| One-level | Secondary | One-level | Secondary | One-level | Secondary | |
| 33.7 | 12.5 | 87.3 | 0.45 | 0.60 | 68.5 | 54.5 |
Production unit that present embodiment adopts and technical process are with embodiment 1.
Its oil density is 878.2Kg/m
3, salts contg is 98.5mgNaCl/l; Desalination temperature is 120 ℃; Emulsion splitter is an oil soluble, and model is EC2425A; Water filling is an Industrial cleaning facility water, PH=8.0.
Single stage desalting emulsion splitter add-on is 2.5 μ g/g, and water injection rate is 7%, and high electric area pulsed electrical field intensity is 3000V/cm, and pulse-repetition is 500Hz, and dutycycle is 50%; Secondary desalination water injection rate is 5%, and high electric area pulsed electrical field intensity is 3000V/cm, and pulse-repetition is 700Hz, and dutycycle is 30%.Desalting and dewatering effect under this condition sees the following form.
| Take off back saliferous/mgNaCll -1 | Total ratio of desalinization/% | Moisture after taking off/% | Sewage with oil/mgl -1 | |||
| One-level | Secondary | One-level | Secondary | One-level | Secondary | |
| 19.6 | 12.4 | 87.4 | 1.1 | 0.4 | 34 | 14.7 |
Embodiment 6
Production unit that present embodiment adopts and technical process are with embodiment 1.
Its oil density is 878.2Kg/m
3, salts contg is 98.5mgNaCl/l; Desalination temperature is 130 ℃; Emulsion splitter is an oil soluble, and model is EC2425A; Water filling is an Industrial cleaning facility water, PH=6.0.
Single stage desalting emulsion splitter add-on is 5.0 μ g/g, and water injection rate is 7%, and high electric area pulsed electrical field intensity is 3500V/cm, and pulse-repetition is 500Hz, and dutycycle is 50%; Secondary desalination water injection rate is 5%, and high electric area pulsed electrical field intensity is 4500V/cm, and pulse-repetition is 700Hz, and dutycycle is 50%.Desalting and dewatering effect under this condition sees the following form.
| Take off back saliferous/mgNaCll -1 | Total ratio of desalinization/% | Moisture after taking off/% | Sewage with oil/mgl -1 | |||
| One-level | Secondary | One-level | Secondary | One-level | Secondary | |
| 4.79 | 2.3 | 97.7 | 0.47 | 0.32 | 71.3 | 66.2 |
Production unit that present embodiment adopts and technical process are with embodiment 1.
Its oil density is 878.2Kg/m
3, salts contg is 98.5mgNaCl/l; Desalination temperature is 115 ℃; Emulsion splitter is an oil soluble, and model is EC2425A; Water filling is an Industrial cleaning facility water, PH=6.0.
Single stage desalting emulsion splitter add-on is 7.5 μ g/g, and water injection rate is 7%, and high electric area pulsed electrical field intensity is 5000V/cm, and pulse-repetition is 1000Hz, and dutycycle is 50%; Secondary desalination water injection rate is 5%, and high electric area pulsed electrical field intensity is 5000V/cm, and pulse-repetition is 1000Hz, and dutycycle is 30%.Desalting and dewatering effect under this condition sees the following form.
| Take off back saliferous/mgNaCll -1 | Total ratio of desalinization/% | Moisture after taking off/% | Sewage with oil/mgl -1 | |||
| One-level | Secondary | One-level | Secondary | One-level | Secondary | |
| 3.8 | 1.2 | 98.8 | 0.05 | 0.05 | 117.9 | 192.9 |
Embodiment 8
Production unit that present embodiment adopts and technical process are with embodiment 1.Present embodiment is and the simultaneous test of common full induction reactance AC power that mainly contrasting object is ratio of desalinization and power consumption.
Its oil density is 878.2Kg/m
3, salts contg is 98.5mgNaCl/l; Desalination temperature is 120 ℃; Emulsion splitter is an oil soluble, and model is EC2425A; Water filling is an Industrial cleaning facility water, PH=6.0.
Single stage desalting emulsion splitter add-on is 5.0 μ g/g, and water injection rate is 7%, and high electric area pulsed electrical field intensity is 3400V/cm, and pulse-repetition is 1000Hz, and dutycycle is 50%; Secondary desalination water injection rate is 5%, and high electric area pulsed electrical field intensity is 3400V/cm, and pulse-repetition is 1000Hz, and dutycycle is 30%.Desalting and dewatering effect under this condition sees the following form.
| Take off back saliferous/mgNaCl1 -1 | Total ratio of desalinization/% | Moisture after taking off/% | Sewage with oil/mgl -1 | Power consumption/Kwht -1 | |||
| One-level | Secondary | One-level | Secondary | One-level | Secondary | ||
| 3.8 | 2.9 | 97.1 | 0.40 | 0.27 | 94.4 | 64.0 | 0.287 |
The condition of the common full induction reactance Alternating Current Power Supply pattern that is adopted is: single stage desalting emulsion splitter add-on is 5.0 μ g/g, and water injection rate is 7%, and the high electric area electric-field strength is 1500V/cm; Secondary desalination water injection rate is 5%, and the high electric area electric-field strength is 1500V/cm.Desalting and dewatering effect under this condition sees the following form.
| Take off back saliferous/mgNaCll -1 | Total ratio of desalinization/% | Moisture after taking off/% | Sewage with oil/mgl -1 | Power consumption/Kwht -1 | |||
| One-level | Secondary | One-level | Secondary | One-level | Secondary | ||
| 37.6 | 15.2 | 84.6 | 0.55 | 0.40 | 85.1 | 51.7 | 0.862 |
From the contrast of above-mentioned two tables as can be seen, under the identical situation of underlying condition, adopt the comparable common AC power ratio of desalinization of the pulse power to improve 12.5 percentage points, and can economize on electricity 66.7%.
Embodiment 9
Production unit that present embodiment adopts and technical process are with embodiment 1.Present embodiment is and the simultaneous test of common full induction reactance AC power that mainly contrasting object is treatment capacity, ratio of desalinization and power consumption.
Its oil density is 878.2Kg/m
3, salts contg is 98.5mgNaCl/l; Desalination temperature is 130 ℃; Emulsion splitter is an oil soluble, and model is EC2425A; Water filling is an Industrial cleaning facility water, PH=7.0.
Single stage desalting emulsion splitter add-on is 5.0 μ g/g, and water injection rate is 7%, and high electric area pulsed electrical field intensity is 4200V/cm, and pulse-repetition is 1000Hz, and dutycycle is 50%; Secondary desalination water injection rate is 5%, and high electric area pulsed electrical field intensity is 4500V/cm, and pulse-repetition is 1000Hz, and dutycycle is 30%.Crude charging capacity is 16l/h, and the desalting and dewatering effect under this condition sees the following form.
| Take off back saliferous/mgNaCll -1 | Total ratio of desalinization/% | Moisture after taking off/% | Sewage with oil/mgl -1 | Power consumption/Kwht -1 | |||
| One-level | Secondary | One-level | Secondary | One-level | Secondary | ||
| 5.6 | 2.0 | 98.0 | 0.13 | 0.20 | 56.7 | 90.0 | 0.354 |
The condition of the common full induction reactance Alternating Current Power Supply pattern that is adopted is: single stage desalting emulsion splitter add-on is 5.0 μ g/g, and water injection rate is 7%, and the high electric area electric-field strength is 1500V/cm; Secondary desalination water injection rate is 5%, and the high electric area electric-field strength is 1500V/cm.Crude charging capacity is 10l/h, and the desalting and dewatering effect under this condition sees the following form.
| Take off back saliferous/mgNaCll -1 | Total ratio of desalinization/% | Moisture after taking off/% | Sewage with oil/mgl -1 | Power consumption/Kwht -1 | |||
| One-level | Secondary | One-level | Secondary | One-level | Secondary | ||
| 37.6 | 15.2 | 84.6 | 0.55 | 0.40 | 85.1 | 51.7 | 0.862 |
From above two table contrasts as can be seen, increase under 60% situation, adopt the comparable common AC power ratio of desalinization of the pulse power to improve 13.4 percentage points, and can economize on electricity 58.9% at crude charging capacity.
Production unit that present embodiment adopts and technical process are with embodiment 1.
Its oil density is 936.2Kg/m
3, salts contg is 168.0mgNaCl/l; Desalination temperature is 145 ℃; Emulsion splitter is an oil soluble, and model is EC2425A; Water filling is an Industrial cleaning facility water, PH=6.0.
Single stage desalting emulsion splitter add-on is 15 μ g/g, and water injection rate is 10%, and high electric area pulsed electrical field intensity is 4500V/cm, and pulse-repetition is 1000Hz, and dutycycle is 50%; Secondary desalination water injection rate is 8%, and high electric area pulsed electrical field intensity is 4500V/cm, and pulse-repetition is 1000Hz, and dutycycle is 30%.Desalting and dewatering effect under this condition sees the following form.
| Take off back saliferous/mgNaCll -1 | Total ratio of desalinization/% | Moisture after taking off/% | Sewage with oil/mgl -1 | |||
| One-level | Secondary | One-level | Secondary | One-level | Secondary | |
| 25.4 | 4.5 | 97.3 | 0.35 | 0.24 | 91.3 | 89.5 |
Claims (7)
1, a kind of crude oil pulsing electrical desalting technique after the crude oil of heating and secondary electric desalting are cut water and emulsion splitter and mixed, enters the single stage desalting jar and carries out the single stage desalting processed, and isolated saliferous oily(waste)water is sent at the bottom of the jar and carried out sewage disposal; After taking off crude oil and washing water and emulsion splitter mix once more from tank deck effusive, enter the secondary electrical desalter and carry out the processing of secondary desalting and dewatering, take off crude oil from tank deck effusive two and send into post-order process processing, the secondary of pot bottom is cut the water filling of water as the one-level electric desalting, it is characterized in that: the processing condition of one-level electrical desalter are: water injection rate 3%～15%, high electric area pulsed electrical field intensity is 800V/cm～5000V/cm, and pulse-repetition is 50Hz～2000Hz, and dutycycle is 6%～50%; The processing condition of secondary electrical desalter are: water injection rate 3%～12%, and high electric area pulsed electrical field intensity is 1500V/cm～5000V/cm, and pulse-repetition is 50Hz～2000Hz, and dutycycle is 0～50%.
2, crude oil pulsing electrical desalting technique according to claim 1, it is characterized in that: the water injection rate that described one-level electricity takes off jar is preferably 5%～10%, high electric area pulsed electrical field intensity is preferably 1500V/cm～4000V/cm, pulse-repetition is preferably 500Hz～1500Hz, and dutycycle is preferably 20%～50%.
3, crude oil pulsing electrical desalting technique according to claim 1, it is characterized in that: the water injection rate that described secondary electricity takes off jar is preferably 5%～9%, high electric area pulsed electrical field intensity is preferably 2000V/cm～4500V/cm, excellent 300Hz～the 1400Hz that is preferably of pulse-repetition, dutycycle is preferably 20%～40%.
4, according to claim 1 or 2 or 3 described crude oil pulsing electrical desalting techniques, it is characterized in that: described washing water can be fresh water or Industrial cleaning facility water, its PH=6～10; Consumption is 3%～15% of a former oil mass; The saline sewage of secondary electric desalting can be used as the washing water of single stage desalting.
5, crude oil pulsing electrical desalting technique according to claim 1 is characterized in that: described electric desalting temperature is 110 ℃～145 ℃.
6, according to claim 1 or 2 or 3 described crude oil pulsing electrical desalting techniques, it is characterized in that: the residence time of described high electric area is 1min～5min.
7, according to claim 1 or 2 or 3 described crude oil pulsing electrical desalting techniques, it is characterized in that: described emulsion splitter is an oil-soluble demulsifier.
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