CN102876355B - Digitalized crude oil electric-dehydration control system and control method - Google Patents
Digitalized crude oil electric-dehydration control system and control method Download PDFInfo
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Abstract
The invention discloses a digitalized crude oil electric-dehydration control system and control method. The control system comprises a crude oil dehydration tank body, a dehydration power source and a control device based on a process control computer (PCC), wherein the dehydration power source is a high-voltage intermediate-frequency pulse power source; and the control device based on PPC implements the digitalized control on the crude oil electric-dehydration process by regulating and controlling the pulse voltage, current, frequency and duty ratio of the high-voltage intermediate-frequency pulse power source. The invention can implement dehydration of crude oil with high water content (up to 95%), high salinity and poor insulating property; and the treated crude oil basically contains trace amount of water, thereby greatly lowering the cost for crude oil water exportation and the expenses for secondary treatment and the like. The invention can lower the overhaul cost for exportation pumps and pipelines. The oil content in treated sewage is less than 50 ppm; and the power consumption for treating every 1000 cubic meters of fluid is less than 48 kilowatt-hours, thereby achieving the goals of high efficiency, energy saving, favorable dehydration effect and low production cost.
Description
Technical field
The invention belongs to crude oil electric dewatering equipment technology field, be specifically related to the digitalization control method that one is suitable for the control system of the poor dehydration of crude oil of the High water cut crude oil of 95% (moisture reach), high salinity and insulating properties, espespecially the total sub-power supply of high pressure medium-frequency pulse wherein.
Background technology
Inevitably containing a large amount of water and salt in the crude oil exploiting out from stratum, this brings many negative effects to follow-up accumulating, link such as refining processing etc., therefore generally needs to carry out crude oil processed in oil field with the water content before making it defeated outward lower than 0.5%.Salt in crude oil mainly exists with the form of alkali and alkaline earth metal ions salt; Water is mainly with 3 kinds of existence forms such as dissolved water, emulsified water, waters in suspension, and wherein emulsified water is comparatively stable, and is difficult to adopt conventional standing sedimentation method to remove.Up to now, people have carried out large quantity research for the separation problem of oil-water emulsion, assist at chemistry on the basis of breakdown of emulsion and also been proposed the measures such as electrostatic coalescence, centrifugation, microwave, ultrasonic wave, UF membrane, but the first-elected electrostatic coalescence method of being really used widely in production procedure, corresponding equipment has electric dehydrator and the large class of electro-desalting device two.Utilize electrostatic coalescence effect to carry out the electric dehydration of crude oil emulsion, not only economic performance is better, and also comparatively friendly to surrounding environment.
Current each oil field mostly adopts conventional electric dehydration method, frequency added by it is interchange or the high direct voltage of 50 Hz, power supply mode generally has interchange dehydration, direct current dehydration and ac-dc dehydration, is used in oil-field aqueous amount in a large number and is less than 30%, the dehydration of crude oil that salinity is low.If water content is higher than 30%, then easily forms water chain between electrode, cause the electric field that collapses, even cannot drop into; And the crude oil that salinity is high, insulating properties are poor, also easily cause the electric field that collapses.Therefore conventional apparatus for electrodewatering can not adapt to the crude Treatment of High water cut, high salinity.For water content higher than 30% crude oil, oil field generally adopts electricity---chemical mode dewaters, and both first adds demulsifier with three phase separator and carries out predrainage to crude oil, drops within 10% by moisture in crude oil; Carry out second dehydration with conventional electric dehydrator again, export after moisture in crude oil being dropped to 0.2%; As long as the oil-containing in sewage is lower than 0.1%, just can discharges and enter sewage-treatment plant and carry out reprocessing.
Summary of the invention
The invention provides a kind of digitalization control method of digitlization electrical oil dewatering water control system, the dehydration of crude oil that the High water cut crude oil of 95% (moisture reach), high salinity and insulating properties are poor can be processed, and automaticity is high, pulse voltage amplitude, frequency and duty cycle adjustment precision are high, adjustable range wide, low energy consumption, low harmony wave.
For this reason, adopt following technical scheme: a kind of digitalization control method of digitlization electrical oil dewatering water control system, this control system has dehydration of crude oil tank body and dehydration power supply, and described control system comprises the control device based on industrial control computer PCC and described dehydration power supply is high pressure medium-frequency pulse power supply; Based on control device of industrial control computer PCC by the adjustment of the pulse voltage of described high pressure medium-frequency pulse power supply, electric current, frequency, dutycycle and control, the Digital Control of crude oil electric dewatering process should be realized; The key step of this Digital Control is: a, when oil product change cause former setup parameter not meet service requirement time, during the puncturing of the generation of water chain and insulation, the moment being characterized by pulse current early stage increases, detect the instantaneous value of pulse current, the frequency f 1 of paired pulses and dutycycle carry out quick adjustment, regulating time and the ratio of adjustment are pressed 1ms and are reduced by 1% reduction dutycycle, and when dutycycle is reduced to 20%, then the speed of pressing 1ms rising 0.1Hz increases frequency; Electric current postpones 50ms when returning to 0.5 times of rated current Ie and recovers former setup parameter; B, progressively rise to 1.5 times of rated current Ie when pulse current is stable, be that intermediate layer is formed, open dosing pump 20min, intermediate layer is eliminated, and electric current drops to 1.2 times of rated current Ie; C, control and regulation oil-water interfaces by draining valve, if oil-water interfaces actual value is less than setting value, 1s reduces valve opening 1%; If oil-water interfaces actual value is greater than setting value, 1s increases valve opening 1%; If oil-water interfaces actual value equals setting value, then keep original valve opening.
Described high pressure medium-frequency pulse power supply comprises wave filter, I and II filter circuit, commutating circuit, inversion circuit, high pressure medium-frequency pulse transformer, its annexation is: the three-phase 380V ac signal of input enters first-level filtering wave circuit after device filtering process first after filtering and carries out further harmonic, enter three phase full bridge commutating circuit afterwards and obtain the adjustable d. c. voltage signal of voltage, this d. c. voltage signal enters after secondary filter circuit carries out strong filtering, enter the low-voltage alternating-current pulse signal that inversion circuit becomes frequency and variable duty ratio, this low-voltage alternating-current pulse signal is amplitude by high pressure medium-frequency pulse transformer boost, frequency, the high-voltage pulse AC signal that dutycycle is adjustable, carry out after positive negative pulse stuffing intercepting through the silicon stack in transformer, put on the pole plate in described dehydration of crude oil tank body.
Connect high accuracy between described inversion circuit and high pressure medium-frequency pulse transformer, conversion time be the response time is the Hall current transmitter of 5 μ s and the high speed detection module of 10 μ s.
Described first-level filtering wave circuit comprises three-phase alternating current reactance device and electric capacity; AB, BC, CA leading-out terminal of reactor is attempted by respectively after electric capacity parallel connection between two.
Described secondary filter circuit comprises two direct current reactors and multiple electric capacity; Multiple electric capacity is attempted by between leading-out terminal DC+, DC-of described pair of direct current reactor respectively.
In described secondary filter circuit, electric capacity is large bulk capacitance.
Described control system has EPA interface.
The present invention can process the poor dehydration of crude oil of the High water cut crude oil of 95% (moisture reach), high salinity and insulating properties, and after process, crude oil water containing be vestige substantially, greatly can reduce the crude oil water containing expense such as defeated cost and after-treatment outward.Also can reduce the cost of overhaul of output pump and pipeline simultaneously; And the sewage with oil after process is less than 50PPM, often processes 1000 cubic metres of liquid measure power consumptions and be less than 48 degree, reach efficient, energy-conservation, that dehydrating effect is good, production cost is low object.And whole control system automaticity is high, pulse voltage amplitude, frequency and duty cycle adjustment precision are high, adjustable range wide, low energy consumption, low harmony wave.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of high pressure medium-frequency pulse power supply of the present invention;
Fig. 2 is that high pressure medium-frequency pulse transformer primary side lateral vein of the present invention rushes double frequency schematic diagram;
Fig. 3 is high pressure medium-frequency pulse transformer secondary side of the present invention positive pulse double frequency schematic diagram;
Fig. 4 is high pressure medium-frequency pulse transformer secondary side of the present invention negative pulse double frequency schematic diagram;
Fig. 5 is the structural representation of the first-level filtering wave circuit of high pressure medium-frequency pulse power supply of the present invention;
Fig. 6 is the structural representation of the secondary filter circuit of high pressure medium-frequency pulse power supply of the present invention;
Fig. 7-1,7-2,7-3 are present system control flow chart.A, B, C wherein in Fig. 7-1 3 corresponds to the respective point in Fig. 7-2; D point in Fig. 7-2 corresponds to the respective point in Fig. 7-3.
Detailed description of the invention
Below by Analysis on Mechanism, the present invention is further detailed explanation in the aspects such as field experiment effect.
Analysis on Mechanism of the present invention:
When crude oil emulsion dewaters in the electric field, the load characteristic of emulsion is capacitive load.Adopt conventional electric dehydration method, the voltage be distributed in when frequency is low on emulsion is very low, and when frequency increases, voltage increases, and when frequency increases to certain value, voltage is gradually constant.When adopting medium-frequency pulse, apply the moment of medium-frequency pulse, voltage is by capacitance profile, and along with continuing of time, voltage is by distribution of resistance: when frequency is lower, the voltage be distributed on emulsion is little, and electric field force is diminished; When frequency is very high, the capacitor charge and discharge effect that emulsion is formed is bad, and water droplet can not respond the change of external electric field well, and dehydrating effect is also bad.
Known by the electrical property of emulsion, any emulsion has its critical breakdown electric field intensity, and when additional electric-field intensity exceeds its critical breakdown electric field intensity, emulsion can be short-circuited; Electric field disappear after, short circuit can disappear, its critical breakdown electric field intensity of emulsion of different nature and short circuit formation time also different with short circuit extinction time.Therefore, medium-frequency pulse electric dehydration technology, can by the frequency of adjustment medium-frequency pulse and dutycycle, and make medium-frequency pulse output time be less than short circuit formation time, the interval time of medium-frequency pulse is greater than short circuit extinction time.That is, before emulsion short circuit is formed, medium-frequency pulse just disappears, and emulsion short circuit disappears, and insulating properties send out next pulse after recovering again.This namely high pressure medium-frequency pulse electric dehydration technology can process the reason of the emulsion poor compared with High water cut, insulating properties.
The dehydration of crude oil of high pressure medium-frequency pulse is compared with conventional crude electric dehydration, except exchange and the dewatering Principle that possesses of alternating current-direct current still effective except, owing to being intermediate frequency, its oscillation stretching, dipole coalescence and the coalescent number of times of electrophoresis increase with the number of times of frequency, strengthen breakdown of emulsion intensity, so dewatering speed is fast, treating capacity is large; Owing to being pulse, its energy is more concentrated, dodges and to jump out target practice effect, so breakdown of emulsion and coalescent more thorough, so dewatering efficiency is high; Also owing to being pulse, it has transient voltage to be nought state, has the effect of arc extinguishing waterproof chain, so dewatering system operates more steadily and has the little feature of power consumption.
From the working mechanism of high pressure intermediate frequency crude oil electric dewatering, if obtain good crude oil electric dewatering effect and the consumption of low electric energy, key is the cooperation of tank internal electric field size and pulse, and the control of the amplitude of high-voltage pulse, frequency and dutycycle and adjustment, electric-field intensity size and the time interval is made to be enough to meet the effective coalescent sedimentation of particle water, before making short-circuit between plates be formed simultaneously, electric-field intensity weakens, short circuit cannot be formed, ensure that electric dehydration high water-content crude oil enters system energy even running when electric off loading is put, and obtain good dehydrating effect.This just proposes very high requirement to manufacturing and designing of battery lead plate in high pressure medium-frequency pulse generator, automatic control protective system, pulse transformer and tank.Simultaneously in order to ensure the water standing sedimentation after breakdown of emulsion, control oil-water interfaces can not have large fluctuation.
Content of the present invention is as follows:
With reference to Fig. 1, a kind of digitlization electrical oil dewatering water control system, has dehydration of crude oil tank body 8, high pressure medium-frequency pulse power supply and the control device based on industrial control computer PCC, described high pressure medium-frequency pulse power supply comprise wave filter 1, I and II filter circuit 2,4, commutating circuit 3, inversion circuit 5, high pressure medium-frequency pulse transformer 7, its annexation is: the three-phase 380V ac signal of input enters first-level filtering ripple loop after device filtering process first after filtering and carries out further harmonic, enter three phase full bridge commutating circuit afterwards and obtain the adjustable d. c. voltage signal of voltage, this d. c. voltage signal enters after secondary filter loop carries out strong filtering, enter the low-voltage alternating-current pulse signal that inversion circuit becomes frequency and variable duty ratio, this low-voltage alternating-current pulse signal is amplitude by high pressure medium-frequency pulse transformer boost, frequency, the high-voltage pulse AC signal that dutycycle is adjustable, carry out after positive negative pulse stuffing intercepting through the silicon stack in transformer, put on the pole plate in described dehydration of crude oil tank body.
Connect high accuracy between described inversion circuit and high pressure medium-frequency pulse transformer, conversion time be the response time is the Hall current transmitter of 5 μ s and the high speed detection module 6 of 10 μ s.
With reference to Fig. 5, described first-level filtering wave circuit comprises a three-phase alternating current reactance device and 6 electric capacity; AB, BC, CA leading-out terminal of reactor is attempted by respectively after electric capacity parallel connection between two.
With reference to Fig. 6, described secondary filter circuit comprises two direct current reactors and 12 electric capacity; 12 electric capacity are all attempted by between leading-out terminal DC+, DC-of described pair of direct current reactor.These 12 electric capacity are the large bulk capacitance of 450V, 10000uF.
System control process of the present invention is as follows:
With reference to Fig. 7-1,7-2, main task flow chart:
1, control power supply is connected;
2, computer for controlling carries out self-inspection: if having fault alarm and wait for failture evacuation; Self-inspection normally carries out next step;
3, device and loop are detected: if there is fault, and display defect content is also reported to the police, and locking pulse exports and halt system runs, and waits for failture evacuation; Self-inspection normally carries out next step;
4, device inspection: device pressure, temperature, oil-water interfaces, if there is fault, display defect content is also reported to the police, and locking pulse exports and halt system runs, and waits for failture evacuation; Self-inspection normally carries out next step;
5, setting runs electrical quantity: pulse amplitude voltage, pulse frequency f1 and f2, pulse duty factor, pulse current, oil-water interfaces etc.;
6, detect major loop to close a floodgate;
7, detect operational mode to select: if pattern is for automatic, call in automatic operational factor; If pattern, for manual, calls in manual operational factor;
8, check Rational Parameters: if parameter is in scope, carry out next step, otherwise enter next step after adjustment parameter
9, detection system start and stop instruction;
10, start up system: difference triggers task 1, subtask 2, subtask 3 after system starts, return the 2nd step.
With reference to Fig. 7-3, subtask 1 flow chart
1, provisional parameter adjustment: check that subtask 2 regulates duty-cycle requirement, to low duty ratio of begging to surrender, then dutycycle is pressed 1ms and reduce by 1% and reduce dutycycle, when dutycycle is reduced to 20%, subtask 2 still requires to reduce dutycycle, then press the speed increase frequency that 1ms raises 0.1Hz, carry out next step; ; If require to recover raw parameter without adjustment, carry out next step;
2, double-frequency pulse is triggered;
3, pulse actual magnitude voltage, frequency f 1 and f2, dutycycle is detected;
4, compare pulse actual magnitude voltage and setting value, the angle of flow of amendment IGCT, returns subtask 1 the 1st step;
With reference to Fig. 7-3, subtask 2 flow chart
1, pulse actual current and setting electric current is compared;
If 2 pulse actual currents are more than or equal to setting 1.5 times, electric current, then send adjustment duty-cycle requirement to subtask 1;
If 3 pulse actual currents are more than or equal to setting 1.2 times, electric current and are less than 2 times, start dosing pump
If 4 pulse actual currents are less than or equal to setting electric current 1.2 doubly, stop dosing pump.
With reference to Fig. 7-3, subtask 3 flow chart
1, oil-water interfaces actual value is detected
2, oil-water interfaces actual value and setting value is compared;
If 3 oil-water interfaces actual values are less than setting value, 1s reduces valve opening 1%; If oil-water interfaces actual value is greater than setting value, 1s increases valve opening 1%; If oil-water interfaces actual value equals setting value, then keep original valve opening; Return subtask 3 the 1st step;
The detailed description of effect of the present invention:
1, power supply of the present invention is the two electric field+double-frequency pulse power supply of AC/DC: first by the adjustment of IGCT fully controlled bridge rectifier bridge control impuls voltage amplitude, IGBT two-phase inverter bridge control impuls frequency and dutycycle, produce voltage magnitude, frequency, dutycycle all at the alternating-current pulse of change, the primary winding coils of supply high pressure medium-frequency pulse transformer.Double-frequency pulse technology appears at the signal of pulse transformer primary winding coils side, the pulse that voltage waveform is herein f1 by a series of frequency forms, but meanwhile the amplitude of this pulse signal changes (f2 is also referred to as pulse amplitude Voltage Cortrol frequency) with frequency f 2 again.Input voltage is elevated to by pulse transformer to be enough to produce the effectively coalescent degree of particle water, and then the pulse that the voltage of Secondary Winding coil sides carries out being similar to the two electric field of AC/DC by silicon stack is intercepted, and the DC voltage of electric field produced can reach 60KV.
Find through test, the parameter such as pulse frequency f1, pulse amplitude Voltage Cortrol frequency f 2, maximum amplitude, minimum amplitude applying electric field directly will have influence on dehydrating effect.Therefore the two electric field+double-frequency pulse technology of AC/DC that the power supply controlled based on industrial control computer PCC produces not only improves the treatment effeciency of crude oil greatly, reduces electric energy loss; And regulated by further pulse double frequency, to reach High water cut, high salinity crude oil enters electric field and can not cause the electric field that collapses, and reduces device to the temperature requirement of medium.With reference to Fig. 2,3,4.This power supply can produce frequency f 1 for 500Hz to 3000Hz, f2 be 0.01Hz to 10Hz double-frequency pulse, pulse duty factor by 20-80% stepless arbitrarily adjustable, pulse voltage amplitude is adjustable from 3KV to 36KV, pulse current reaches 0-6A, can arrange arbitrarily and adjust.
2, the harmonic suppressing method strengthened is adopted: with reference to Fig. 5, Fig. 6, due to the dehydration of crude oil for different densities, viscosity, required pulse frequency, dutycycle are different with amplitude, and pulse frequency, dutycycle and amplitude frequently adjust in running, therefore the crude oil electric dewatering pulse power produces very large harmonic pollution electrical network, therefore this power acquisition dual filtering technique, and adopt three phase full bridge rectification.(adopt U.S. emerald green 2292 power quality analyzers to measure) after testing, after adopting double-smoothing, the harmonic wave factor when the pulse power works is 9.2%, is the low harmony wave pulse power.
3, all-digitized demodulator scheme perfect fast: directly adopt industrial computer PCC as the control core of power supply, the fault detect of each for power supply device (is exchanged the temperature of reactor and two direct current reactor, IGBT module fault, fastp-acting fuse fault, the opening and closing state of main switch, DC voltage, DC current, power pulse electric current, the temperature of pulse voltage and skid-mounted unit, pressure, oil-water interfaces etc. detect), the voltage magnitude of pulse, frequency, dutycycle is directly controlled by drive plate, in 5ms ~ 10ms, the voltage magnitude of pulse is completed when water chain is formed or insulation breakdown electric current increases, frequency, dutycycle adjusts, guarantee High water cut, high salinity or enter dehydration sledge not collapse electric field through the polynary crude oil adopting the poor emulsion of insulating properties that drives, equipment is made to carry out dewatering and the electric field that do not collapse under the crude oil quality condition of complexity.Result of field running shows, when the crude oil water content entering electrical oil dewatering hydroskis reaches more than 92%, device normally works.And Site Detection signal and field control signal, carry out digital communication to reduce controller to on-the-spot cable by fieldbus explosion-proof tank and CAN and controller, improve system rejection to disturbance, intensifier reliability of operation.
4, the control model of low energy consumption: play detectability, computing capability and control ability that industrial computer PCC is powerful, pulse voltage amplitude, frequency, dutycycle can control fast and accurately.Frequency range is 500Hz ~ 3000Hz, and frequency adjustment precision is 0.01Hz; Pulse amplitude scope is 3KV ~ 36KV, and pulse amplitude degree of regulation is 1V; Pulse duty factor scope is 10 ~ 80%, and pulse duty factor degree of regulation is 130ns; Can be dehydration of crude oil sledge dewatering electric field and specific double-frequency pulse needed for breakdown of emulsion is provided, save electric energy, often process moisture 50% profit of 2000 sides to mix liquid power consumption and be less than 100 degree, power consumption very little (conventional apparatus for electrodewatering often process moisture 25% profit of 2000 sides mix liquid power consumption be greater than 1000 degree).
5, the process control pattern of low cost, high-environmental: power supply arranges fast current detection, when electric current increases to a certain value instantaneously, system can automatically the dutycycle of regulating impulse, amplitude voltage and frequency be carried out step-down, fall stream and run.We find in running at the scene, and medium-frequency pulse electro-dewatering apparatus can not add demulsifier and dewater, and does not have the interference of demulsifier, and breakdown of emulsion is more thorough, and the water oil-containing deviate from is lower (being less than 50ppm).But medium-frequency pulse electro-dewatering apparatus does not add demulsifier for a long time to be run, and water termination progressively forms intermediate layer, causes electric current progressively to increase.Therefore the pulse current run is measured at Energy control, select the Hall current transmitter of 100ms and the high speed detection module of 5ms ~ 10ms, judge that the change of electric current is that water chain (or insulation breakdown) causes or intermediate layer produces, when electric current 1.2Ie<I<1.5Ie (Ie power supply runs rated current), the dosing of output relay action control dosing pump.On-the-spot operation shows only need automatically add demulsifier 20min every 4 ~ 6 hours, for eliminating the intermediate transition layer on thickening oil-water interfaces, greatly reduces the injected volume (saving the consumption 80% of demulsifier) of demulsifier.Add with do not add demulsifier to electric current, process after the effect of crude oil water containing and sewage with oil refer to table 1 ~ table 3.Add demulsifier and do not add demulsifier dehydration contrast test, carry out under the following conditions:
Medium: crude oil water containing content about 70%, pressure 0.1 MPa ~ 0.3MPa, medium temperature>=60
oc, treating capacity 50 ~ 52m
3/ h, specific gravity of crude (during environment temperature 20 DEG C) 0.852g/cm
3, the proportion (during environment temperature 20 DEG C) of viscosity 48.2CST, water: 1.051g/cm
3; In voltage 2000V, frequency 2000Hz, dutycycle 50%.
Table 1 current time change list
The table of comparisons one (adding demulsifier)
The table of comparisons two (not adding demulsifier)
6, networking mode flexibly: this control system stays EPA interface, can realize Long-distance Control easily by LAN, or is connected with the DCS of multi-purpose station.
7, simple to operate, directly perceived: the switch board door of this control system is equipped with Human machine interface, the operation of electric dehydrator carries out at touch-screen, and a key runs.
8, run conveniently: the de-operational factor of electricity all can monitor on Human machine interface.
9, safeguard simply: the de-operation troubles of electricity all can show on Human machine interface, is convenient to safeguard.
10, service data of the present invention:
Be explained in Tarim Oilfield 161 turns station service data below.
Tarim Oilfield 161 turns station crude oil has the feature of High water cut, high salinity, its oil density 0.852g/ cm3,
Crude oil water containing >=70%, crude oil salinity are very high, conductance is high; The saliferous weight of water, the especially good conductor of electricity.To this, use traditional alternating current dehydration or alterating and direct current dewatering, all cannot effectively implement.Therefore 161 turns of station dehydrations of crude oil still adopt interpolation demulsifier large tank decanter type dewatering process.This technique not only will consume a large amount of demulsifiers, also will consume a large amount of electric energy in conveying wet crude, cause production cost high.
Adopt the crude oil electric dewatering skid-mounted unit of this control system, in the index that Tarim Oilfield 161 turns station is run;
Treating capacity is 2000M
3/ d;
Treatment media water content can up to 90%;
Water in oil after process is vestige substantially;
Sewage with oil after process is less than 50PPM;
Often process 1000M
3liquid measure power consumption is less than 48 degree;
The 72 hours industrial operating index in Tarim Oilfield 161 turns of stations are in table 4.
And the electrical oil dewatering water quality standard SY/T0045-1999 " crude oil electric dewatering design specification " that China promulgates for 1999 does following regulation to electric dehydration operating index:
3.0.1 the crude oil water content entering electric dehydrator should not be greater than 30%;
3.0.2 its moisture index of regulation dewatered oil should be less than or equal to 0.5%;
3.0.3 specify, the oil content of the sewage deviate from from electric dehydrator should not be greater than 0.5%.
8.0.1 the demulsifier of electric dewatering apparatus for crude oil use, answers its kind of selection of science, consumption, addition point and feed postition.
8.0.5 the feed postition of demulsifier, should adopt the dosing pump of regulating flow quantity quantitatively, continuously, uniformly to add production system.
Obviously, indices of the present invention is far away higher than Standard.
Table 4 72 hours industrial operating index lists
Claims (6)
1. the digitalization control method of a digitlization electrical oil dewatering water control system, this control system has dehydration of crude oil tank body and dehydration power supply, it is characterized in that: described control system comprises the control device based on industrial control computer PCC and described dehydration power supply is high pressure medium-frequency pulse power supply, based on control device of industrial control computer PCC by the adjustment of the pulse voltage of described high pressure medium-frequency pulse power supply, electric current, frequency, dutycycle and control, the Digital Control of crude oil electric dewatering process should be realized, the key step of this Digital Control is: a, when oil product change cause former setup parameter not meet service requirement time, during the puncturing of the generation of water chain and insulation, the moment being characterized by pulse current early stage increases, detect the instantaneous value of pulse current, the frequency f 1 of paired pulses and dutycycle carry out quick adjustment, regulating time and the ratio of adjustment are pressed 1ms and are reduced by 1% reduction dutycycle, and when dutycycle is reduced to 20%, then the speed of pressing 1ms rising 0.1Hz increases frequency, electric current postpones 50ms when returning to 0.5 times of rated current Ie and recovers former setup parameter, b, progressively rise to 1.5 times of rated current Ie when pulse current is stable, be that intermediate layer is formed, open dosing pump 20min, intermediate layer is eliminated, and electric current drops to 1.2 times of rated current Ie, c, control and regulation oil-water interfaces by draining valve, if oil-water interfaces actual value is less than setting value, 1s reduces valve opening 1%, if oil-water interfaces actual value is greater than setting value, 1s increases valve opening 1%, if oil-water interfaces actual value equals setting value, then keep original valve opening, described high pressure medium-frequency pulse power supply comprises wave filter, I and II filter circuit, commutating circuit, inversion circuit, high pressure medium-frequency pulse transformer, its annexation is: the three-phase 380V ac signal of input enters first-level filtering wave circuit after device filtering process first after filtering and carries out further harmonic, enter three phase full bridge commutating circuit afterwards and obtain the adjustable d. c. voltage signal of voltage, this d. c. voltage signal enters after secondary filter circuit carries out strong filtering, enter the low-voltage alternating-current pulse signal that inversion circuit becomes frequency and variable duty ratio, this low-voltage alternating-current pulse signal is amplitude by high pressure medium-frequency pulse transformer boost, frequency, the high-voltage pulse AC signal that dutycycle is adjustable, carry out after positive negative pulse stuffing intercepting through the silicon stack in transformer, put on the pole plate in described dehydration of crude oil tank body.
2. the digitalization control method of a kind of digitlization electrical oil dewatering water control system according to claim 1, is characterized in that: connect high accuracy between described inversion circuit and high pressure medium-frequency pulse transformer, conversion time be the response time is the Hall current transmitter of 5 μ s and the high speed detection module of 10 μ s.
3. the digitalization control method of a kind of digitlization electrical oil dewatering water control system according to claim 1, is characterized in that: described first-level filtering wave circuit comprises three-phase alternating current reactance device and electric capacity; AB, BC, CA leading-out terminal of reactor is attempted by respectively after electric capacity parallel connection between two.
4. the digitalization control method of a kind of digitlization electrical oil dewatering water control system according to claim 1, is characterized in that: described secondary filter circuit comprises two direct current reactors and multiple electric capacity; Multiple electric capacity is attempted by between leading-out terminal DC+, DC-of described pair of direct current reactor respectively.
5. the digitalization control method of a kind of digitlization electrical oil dewatering water control system according to claim 4, is characterized in that: in described secondary filter circuit, electric capacity is large bulk capacitance.
6. the digitalization control method of a kind of digitlization electrical oil dewatering water control system according to claim 1, is characterized in that: described control system has EPA interface.
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201648318U (en) * | 2009-12-11 | 2010-11-24 | 北京石油化工学院 | All-digital control secondary inversion type high-voltage variable-frequency rectangular-wave alternating current power supply device for crude oil dehydration |
Non-Patent Citations (1)
| Title |
|---|
| 基于DSP控制的原油脱水电源的研究;宋玉忠;《中国优秀硕士学位论文全文数据库 工程科技I辑》;20111015(第10期);B019-186 * |
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| Publication number | Publication date |
|---|---|
| CN102876355A (en) | 2013-01-16 |
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