CN105062550A - Method for monitoring electric desalting indexes continuously in real time - Google Patents
Method for monitoring electric desalting indexes continuously in real time Download PDFInfo
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- CN105062550A CN105062550A CN201510496108.9A CN201510496108A CN105062550A CN 105062550 A CN105062550 A CN 105062550A CN 201510496108 A CN201510496108 A CN 201510496108A CN 105062550 A CN105062550 A CN 105062550A
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Abstract
The invention relates to a method for monitoring electric desalting indexes continuously in real time and mainly solves the problem that the salt content, the water content and the oil content of crude oil after removal cannot be monitored continuously in the prior art. According to the method for monitoring the electric desalting indexes continuously in real time, the crude oil before removal passes an electric desalter and enters a pre-processing system from a measurement and analysis bypass, the crude oil after removal is filtered and subjected to heat exchange, the crude oil after heat exchange enters a sampling system, an on-line water content analyzer probe and an on-line water salt analyzer probe are mounted in the sampling system, real-time data measured by the probes are transmitted to a control cabinet through a transmitter I, the control cabinet is connected with a DCS (distributed control system), a drainage pipeline is arranged at the bottom of the electric desalter, an on-line oil content analyzer probe is arranged on the drainage pipeline, and real-time data measured by the on-line oil content analyzer probe are transmitted to a control cabinet through a transmitter II. With adoption of the technical scheme, the problem is solved better, and the method can be used for monitoring the electric desalting indexes continuously in real time.
Description
Technical field
The present invention relates to a kind of monitoring electric desalting in real time continuously and refer to calibration method.
Background technology
Crude oil produced all over the world all contains a certain amount of salt, water, heavy metal and other impurity, these impurity to the accumulating of crude oil, add trade union and cause disadvantageous effect, cause equipment corrosion, affect quality product.For this reason, crude oil, before entering oil refining apparatus processing, all must carry out dewatering and desalting process.According to the requirement of China's petrochemical industry standard, the saltiness of crude oil after electric desalting/apparatus for electrodewatering takes off is not more than 3mg/L, and water content is not more than 0.2%, and draining oleaginousness is not more than 200mg/L.Current China is for the mensuration of crude oil electric desalting technical controlling index mainly through backlash sampling, and lab analysis is chemically examined, if equipment occurs that exception or oil property change greatly, can increase the analysis frequency.So not only can the manpower of at substantial, and can operating delay be caused, can not adjusting process parameter in time, affect desalting effect.Existing patented technology mostly concentrates in the research and development of desalter, such as CN201110033151, CN204039343U, CN103805230A, CN103239892A etc., little with the patent on measuring in the control of desalting technology index, CN101607149A relates to intelligent response control electrical desalting and dewatering device and control method can when crude oil and working condition change, the high pressure outputted on electrodesalting and electrodehydrating tank body inner high voltage battery lead plate is made more to be applicable to oil-water emulsion situation according to the emulsification degree of tank in-vivo medium, CN1810669A relates to autocontrol method and the system of system for corporate electrically desalting, can monitor and judge that whether electric desalting equipment effluent quality is normal, but de-rear salt content in crud oil can not be monitored, moisture whether normal.
The present invention solves this problem targetedly.
Summary of the invention
Technical problem to be solved by this invention cannot take off the problem of rear salt content in crud oil, moisture, oleaginousness by monitoring continuously in prior art, provides a kind of monitoring electric desalting in real time continuously newly to refer to calibration method.The method is used for continuously in real time in monitoring electric desalting index, has and can take off the advantage of rear salt content in crud oil, moisture, oleaginousness by monitoring continuously.
For solving the problem, the technical solution used in the present invention is as follows: a kind of monitoring electric desalting in real time continuously refers to calibration method, before de-, crude oil is after electrical desalter, a part enters de-rear crude exports pipeline, another part enters pretreatment system from Measurement and analysis bypass, de-rear crude oil is filtered, heat exchange, sampling system is entered after crude oil heat exchange, online water-content analyser probe is installed in sampling system, online salts contg analyser probe, the real time data of described probe measurement is transferred to housing by transmitter, housing is connected with DCS (dcs) system, water discharge line is provided with bottom electrical desalter, water discharge line is provided with online oil-contg analyser probe, the real time data of online oil-contg analyser probe measurement is transferred to housing by transmitter, analytical system is provided with wash-down water pipeline source line, on the wash-down water outlet line of analytical system, pretreatment system is equipped with purging nitrogen inlet pipeline, operator are according to the change of DCS system real-time monitoring data, and after taking off, crude oil water content and/or salts contg exceed indication range alarm, and the timely adjusting process parameter of operator, until index returns in normal range.
In technique scheme, preferably, described online water-content is measured and is adopted capacitance method, and online salts contg analysis adopts x-ray fluorescence method, and online oil-contg analysis adopts UV-fluorescence method of masurement.
In technique scheme, preferably, the outlet line of described analytical system is provided with reverse pumping pump, and reverse pumping pump discharge is divided into two-way, and a road is wash-down water outlet, and another road is connected with de-rear crude exports pipeline.
This patent and existing electric desalting robot control system(RCS) are compared with method, can realize simultaneously continuous real-time monitoring crude oil de-after the index such as saliferous, moisture and draining oleaginousness, and there is automatic backwash system, measurement system long-play can be ensured, not by the impact of the media such as viscous crude, achieve good technique effect.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the method for the invention.
In Fig. 1,1 is de-front crude oil; 2 is electrical desalter; 3 is pretreatment system; 4,17 is nitrogen; 5 is sampling system; 6 is wash-down water source line; 7,10,15 is transmitter; 8 is housing; 9 is DCS system; 11 is reverse pumping pump; 12 is wash-down water outlet; 13 is de-rear crude exports pipeline; 14 is electrical desalter water discharge line; 16 is online oil-contg analyser probe; 18 is online water-content analyser probe; 19 is online salts contg analyser probe; 20 is Measurement and analysis bypass.
Below by embodiment, the invention will be further elaborated, but be not limited only to the present embodiment.
Embodiment
[embodiment 1]
As shown in Figure 1, before de-, crude oil is after electrical desalter, a part enters de-rear crude exports pipeline, another part enters pretreatment system from Measurement and analysis bypass, de-rear crude oil is filtered, heat exchange, sampling system is entered after crude oil heat exchange, online water-content analyser probe is installed in sampling system, online salts contg analyser probe, the real time data of described probe measurement is transferred to housing by transmitter, housing is connected with DCS system, water discharge line is provided with bottom electrical desalter, water discharge line is provided with online oil-contg analyser probe, the real time data of online oil-contg analyser probe measurement is transferred to housing by transmitter, analytical system is provided with wash-down water pipeline source line, on the wash-down water outlet line of analytical system, pretreatment system is equipped with purging nitrogen inlet pipeline, operator are according to the change of DCS system real-time monitoring data, and after taking off, crude oil water content and/or salts contg exceed indication range alarm, and the timely adjusting process parameter of operator, until index returns in normal range
Because de-rear crude oil water content is lower, online water-content is measured and is adopted capacitance method, and when dielectric fluid (oil) flows through between two coaxial electrodes, the change of its electrical capacity measured by analyser.Online salts contg analysis adopts x-ray fluorescence method, and oil-in-water content is measured by UV-fluorescence measuring technology.The probe installed needs anticorrosive, ageing-resistant.Real-time measuring data is transferred to housing by transmitter, housing is connected with DCS system, operator can change by real-time monitoring data, the system alarm when de-rear crude oil water content and/or salts contg frequently exceed indication range, operator can adjust the processing parameters such as injecting amount, mixture strength, water injection rate, temperature, strength of electric field, in time until index returns in normal range.
Because viscosity of crude is large and containing impurity, measuring accuracy can be affected, need after system cloud gray model for some time to carry out circulation back flushing, backwashing water is closed after water quality is limpid, open purging nitrogen to purge pretreatment system, sampling system, close all valves on back-purge system after purging for some time, open Measurement and analysis bypass and start to measure.
[comparative example]
Adopt prior art; can monitor and judge that whether electric desalting equipment effluent quality is normal; if normal, continue monitoring electric desalting effluent quality; if abnormal, open reverse flow valve and time-delay closing product water valve; time delay stops dosing pump, rectifier and dense water-circulating pump, finally makes the overall auto stop of this cover electric desalting treatment system.Achieve the automatic monitoring of electric desalting drainage index, but de-to crude oil after saliferous and moisturely do not design automated measurement &control system, still need by artificial assay to meet service requirements.
Obviously, this patent and existing electric desalting robot control system(RCS) are compared with method, can realize simultaneously continuous real-time monitoring crude oil de-after the index such as saliferous, moisture and draining oleaginousness, and there is automatic backwash system, measurement system long-play can be ensured, not by the impact of the media such as viscous crude, achieve good technique effect.
Claims (3)
1. the continuous electric desalting of monitoring in real time refers to calibration method, before de-, crude oil is after electrical desalter, a part enters de-rear crude exports pipeline, another part enters pretreatment system from Measurement and analysis bypass, de-rear crude oil is filtered, heat exchange, sampling system is entered after crude oil heat exchange, online water-content analyser probe is installed in sampling system, online salts contg analyser probe, the real time data of described probe measurement is transferred to housing by transmitter, housing is connected with DCS system, water discharge line is provided with bottom electrical desalter, water discharge line is provided with online oil-contg analyser probe, the real time data of online oil-contg analyser probe measurement is transferred to housing by transmitter, analytical system is provided with wash-down water pipeline source line, on the wash-down water outlet line of analytical system, pretreatment system is equipped with purging nitrogen inlet pipeline, operator are according to the change of DCS system real-time monitoring data, and after taking off, crude oil water content and/or salts contg exceed indication range alarm, and the timely adjusting process parameter of operator, until index returns in normal range.
2. monitoring electric desalting in real time refers to calibration method continuously according to claim 1, and it is characterized in that described online water-content is measured and adopt capacitance method, online salts contg analysis adopts x-ray fluorescence method, and online oil-contg analysis adopts UV-fluorescence method of masurement.
3. the continuous electric desalting of monitoring in real time refers to calibration method according to claim 1, and it is characterized in that the outlet line of described analytical system is provided with reverse pumping pump, reverse pumping pump discharge is divided into two-way, and a road is wash-down water outlet, and another road is connected with de-rear crude exports pipeline.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107267194A (en) * | 2017-07-21 | 2017-10-20 | 四川达灿石油设备有限公司 | Based on electronically controlled crude oil antiseptic treatment equipment |
| CN113457266A (en) * | 2020-03-30 | 2021-10-01 | 中国石油天然气集团有限公司 | Early warning device and early warning method for fluctuation of quality of electric desalting wastewater |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140202929A1 (en) * | 2013-01-18 | 2014-07-24 | Ecolab Usa Inc. | Systems and methods for monitoring and controlling desalting in a crude distillation unit |
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2015
- 2015-08-13 CN CN201510496108.9A patent/CN105062550A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140202929A1 (en) * | 2013-01-18 | 2014-07-24 | Ecolab Usa Inc. | Systems and methods for monitoring and controlling desalting in a crude distillation unit |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107267194A (en) * | 2017-07-21 | 2017-10-20 | 四川达灿石油设备有限公司 | Based on electronically controlled crude oil antiseptic treatment equipment |
| CN113457266A (en) * | 2020-03-30 | 2021-10-01 | 中国石油天然气集团有限公司 | Early warning device and early warning method for fluctuation of quality of electric desalting wastewater |
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Address after: Yanan City, Shandong province Qingdao City three road 266071 No. 218 Applicant after: Sinopec Corp. Applicant after: Qingdao Safety Engineering Research Institute of Sinopec Co., Ltd. Address before: 100728 Chaoyangmen street, Beijing, No. 22, No. Applicant before: Sinopec Corp. Applicant before: Qingdao Safety Engineering Research Institute of Sinopec Co., Ltd. |
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Application publication date: 20151118 |