CN102096387A - Automatic control system used for crude oil automatic online sampler - Google Patents
Automatic control system used for crude oil automatic online sampler Download PDFInfo
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Abstract
The invention relates to an automatic control system used for a crude oil automatic online sampler. The automatic control system comprises a PLC (programmable logic controller), and a sampler comprising a circulating pipeline connected with a main oil transmission pipeline, a circulating pump causing crude oil to flow in the circulating pipeline and a sampling pump which is connected with the circulating pipeline and is used for conveying a crude oil sample, wherein the PLC is used for controlling the process that the sampler samples crude oil from the main oil transmission pipeline in a flow ratio; and the PLC controller is connected with the sampling pump, and the output flow of the sampling pump and crude oil flow of the main oil transmission pipeline are in proportional control. Under the control of the PLC controller with strong universality and high reliability, the flows of the circulating pump and the sampling pump can synchronously track the flow of a main pipeline in proportion, thus the sampled crude oil sample has good representativeness. The PLC has the control functions of sample management, alarm indication and the like; and the operations of parameter display, status display, control maintenance and the like in the sampling process can be realized by coordinating with a human-machine interface.
Description
Technical field
The present invention relates to a kind of automatic control system, particularly a kind of automatic control system that is used for crude oil automatic on-line sampler.
Background technology
Along with the continuous development of crude oil measurement technology, also more and more higher to the requirement that former oil sample is accurately analyzed, how the long-distance transport pipes of continuous operation are obtained representational crude oil sample is vital, also is the important requirement of oil field oil transportation management.
Crude oil in China and liquid petroleum product pipeline sampling mostly adopt manual sampling method at present, the defective of manual sampling is: because its sampling frequency is little, be subject to influences such as oil transportation operating mode and human factor, cause sample representativeness poor, and the handing-over metering dispute that causes thus is increasing.
Automatically sampling solves the good method of this type of problem beyond doubt.Yet, the many control instrument controls by integrated circuit (IC) design of present domestic automatic crude sampler sampling process can only can't be adjusted sampling according to the oil transportation operating mode in real time according to preestablishing the crude oil that extracts in the pipe laying, and failure rate is higher, and the maintenance nursing process is loaded down with trivial details.
Summary of the invention
The purpose of this invention is to provide a kind of automatic control system that is used for crude oil automatic on-line sampler, by the PLC(programmable logic controller (PLC)) control, make the flow of ebullator and sampling pump can follow the tracks of the trunk line flow in proportion synchronously, realize the crude oil accurate control of sampling automatically.
In order to achieve the above object, technical scheme of the present invention provides a kind of automatic control system that is used for crude oil automatic on-line sampler, described automatic control system comprises the PLC controller, and it is controlled by the process that flow proportional carries out crude oil sampling from the main oil pipeline described sampler;
Described sampler comprises the circulation line that is connected with described main oil pipeline, the ebullator that crude oil is flowed in described circulation line, and be connected with described circulation line, the sampling pump of conveying crude oil sample;
Described PLC controller is connected with described sampling pump, controls the proportional control of oil flow of the delivery rate and the described main oil pipeline of described sampling pump.
Described PLC controller is connected with described ebullator, the crude oil flow velocity of controlling in the described circulation line of described ebullator output is identical with the crude oil flow velocity of described main oil pipeline, and the proportional control of the oil flow of the delivery rate of described ebullator and described main oil pipeline.
Described main oil pipeline is provided with flowmeter; Described PLC controller is connected with this flowmeter, receives the oil flow of the described main oil pipeline of its transmission, as the reference value of sample flow proportional control.
Described circulation line is provided with flow switch; Described PLC controller is connected with described flow switch, receives and monitor the oil flow status signal in the described circulation line of its transmission.
Described circulation line is provided with some crude state pick-up units, and it is connected respectively with described PLC controller, sends the sampling state parameter of crude oil in the described circulation line to it;
According to described sampling state parameter, the described sampler of described PLC controller drives is adjusted, and described sampling state parameter is consistent with crude state parameter in the described main oil pipeline;
Described crude state pick-up unit comprises pressure unit and temperature transmitter.
Described sampler also comprises some sampling jars;
Described some sampling jars, the some sampling solenoid valves by correspondence is provided with are connected with described sampling delivery side of pump respectively; When described solenoid valve was opened, described sampling pump injected crude oil sample in described sampling jar;
Described PLC controller is connected with described some sampling solenoid valves respectively, and controls the unlatching of described some sampling solenoid valves or close.
Described sampling jar is provided with electronic weighing device; Described PLC controller is connected with described electronic weighing device respectively, receives and monitor the weight data of the described sampling jar of its transmission; Described PLC controller by real-time weight and the empty bottle weight of comparing described sampling jar, is judged the sample size of gathering in the described sampling jar.
Described circulation line is provided with the filtrator of band differential pressure transmitter; Described PLC controller is connected with described differential pressure transmitter, and monitors the differential pressure value of described filtrator both sides.
Described sampler also comprises the purging system that is communicated with described circulation line; Described PLC controller is connected with described purging system, and monitors the medium liquid level in the described purging system.
Described PLC controller also is connected with a man-machine interface;
By described man-machine interface, provide operational order or carry out the adjustment of controlled variable to described PLC controller;
Described PLC controller is controlled state parameter or alerting signal or the output demonstration of operational order on described man-machine interface in the described sampling process.
Compared with prior art, the automatic control system that is used for crude oil automatic on-line sampler of the present invention, its advantage is: the present invention uses highly versatile, PLC controller that reliability is high, to crude oil automatically sampling accurately control.Because flow constantly changes in the main oil pipeline, can automatically take a sample according to flow proportional for making sampler, under the control of described PLC controller, make the flow of described ebullator and sampling pump follow the trail of the trunk line flow in proportion synchronously, the flow control accuracy of especially described sampling pump should satisfy system requirements, crude state during with the assurance sampling in the circulation line is consistent with the crude oil time of day that flows through in the main oil pipeline, makes the crude oil sample of being taken a sample have good representativeness.Described PLC controller has control function such as sample managing and warning indication; Cooperate man-machine interface, also can realize operations such as parameter shows in the sampling process, state shows, control maintenance.
Description of drawings
Fig. 1 is the annexation synoptic diagram of automatic control system of the present invention and crude oil automatic on-line sampler.
Embodiment
Below in conjunction with description of drawings the specific embodiment of the present invention.
As shown in Figure 1, crude oil automatic on-line sampler can be with press operation to carry out crude oil sampling automatically by flow proportional from main oil pipeline 40.Automatic control system of the present invention uses programmable logic controller (PLC) (hereinafter to be referred as PLC controller 10) to constitute, and the automatic sampling process of described sampler is controlled.
Described sampler is connected with main oil pipeline 40 by a circulation line, under ebullator 33 effects, crude oil passes through sample tap 31, filtrator 32, ebullator 33, flow switch 34, the refluxing opening 38 of described circulation line successively, flows back in the described main oil pipeline 40; One sampling pump 35 is connected with this circulation line, in conveying crude oil sample to two sampling jar 36.
Described PLC controller 10 is also with a man-machine interface 20(HMI) be connected.The staff provides operational order or carries out the adjustment of controlled variable to PLC controller 10 by described man-machine interface 20.By described PLC controller 10, control all state parameters or the output on described man-machine interface 20 such as alerting signal or operational order that relate in the above-mentioned sampling control procedure and show.
Particularly, described main oil pipeline 40 is provided with mixer 41, and the crude oil homogeneous is mixed.Described sample tap 31 is plugged in the main oil pipeline 40, the downstream of mixer 41.
Described filtrator 32 both sides are provided with ball valve 311,331, and are connected with ebullator 33 with described sample tap 31 respectively.Described PLC controller 10 is connected with a differential pressure transmitter 321 that is provided with on this filtrator 32, receives the differential pressure value of described filtrator 32 both sides, conveniently the user mode of described filtrator 32 is monitored.When pressure reduction surpasses setting threshold, described PLC controller 10 will provide alerting signal, submit to the staff to handle.
Described ebullator 33, the pipeline of its input end is connected with one of them input port of tee ball valve 37, and the pipeline of output terminal is connected with another input port of this tee ball valve 37; The delivery outlet of tee ball valve 37 is connected with described refluxing opening 38 by a ball valve 381.
Described PLC controller 10 is connected with a flowmeter 42 that is provided with on the described main oil pipeline 40, receives the oil flow in the main oil pipeline 40, as the reference value of sample flow proportional control.
The motor of described ebullator 33 is by described PLC controller 10 controls, under asynchronous machine Frequency Converter Control mode, work, guarantee that the crude oil flow velocity in the described circulation line is consistent with flow velocity in the main oil pipeline 40, and, the proportional control of oil flow of the flow of described ebullator 33 and described main oil pipeline 40.
Described flow switch 34, a pressure unit 341, a temperature transmitter 342, be arranged on the circulation line part of described ebullator 33 downstreams to tee ball valve 37, and be connected with described PLC controller 10 respectively, send the sampling state parameter of the crude oil that flows in the described circulation line to it.
Wherein, described flow switch 34 is to PLC controller 10, send the digital quantity signal whether crude oil flow is arranged in the described circulation line, to PLC controller 10 output ON, export OFF during no flow and when promptly in the circulation line flow being arranged by PLC controller 10 output alarm signals.Described pressure unit 341 and temperature transmitter 342 send the analog signals of 0 ~ 20mA of circulation line Central Plains oil pressures and temperature respectively to described PLC controller 10.
Drive described sampler by described PLC controller 10 and automatically adjust, the crude state when making sampling in the circulation line, consistent with the crude state in the described main oil pipeline 40; Thereby crude oil sample could be represented the time of day of the crude oil that flows through in master's oil pipeline 40 in the sampling jar 36 when sampling.
The input end of described sampling pump 35 also is arranged on the circulation line part of above-mentioned ebullator 33 downstreams to tee ball valve 37; On pipeline that its output terminal is connected, correspondence is provided with two sampling solenoid valves 351, is connected with described two sampling jars 36 respectively.
Described sampling pump 35 adopts the precision gear volume pump.Described PLC controller 10 is connected with described sampling pump 35, send the control signal of 0 ~ 20mA to it, drive the stepper motor work of this sampling pump 35, thereby the oil flow of its output is accurately controlled, make this flow can follow the tracks of the flow of described main oil pipeline 40 in proportion synchronously.
Described sampling solenoid valve 351 uses explosion-proof electrically-controlled valve, is connected with described PLC controller 10.Described PLC controller 10 output switching value control signals drive described sampling solenoid valve 351 and regularly open, and inject crude oil sample in sampling jar 36; When meeting the requirements of liquid level, control described sampling solenoid valve 351 and close.The remaining crude oil of taking a sample flows back on the described circulation line.
Described two sampling jars, 36 bottom correspondences are provided with electronic weighing device 361, and are connected with described PLC controller 10 respectively, send the weight data of described sampling jar 36 to it.Described PLC controller 10 by real-time weight and the empty bottle weight of comparing described sampling jar 36, judges whether collected enough sample sizes in this sampling jar 36.If when liquid level surpasses setting height in the sample thief, described PLC controller 10 will provide alerting signal.
Described sampler also comprises a purging system 39 that is connected with described PLC controller 10, its by a ball valve 391 be arranged on the described circulation line, the input end position of described ebullator 33.Medium liquid level in described PLC controller 10 these purging systems 39 of monitoring realizes the condition monitoring to described purging system 39.
The power supply capacity alternating current 220V of automatic control system of the present invention, 1000W, and use the direct current of 24V to make basis control power supply.Described PLC controller 10 uses PLC S214XP as its master cpu, its with described man-machine interface 20 between use PPI communications protocol.
On the described man-machine interface 20, output shows the instantaneous value as oil flow in the main petroleum pipeline, the rotating speed percentage of ebullator 33, the rotating speed of sampling pump 35 and flow percentage, main oil pipeline 40 pressure, the differential pressure value of filtrator 32 both sides, the rod figure of sample liquid level and percentage height value in the sampling jar 36, purging system 39 medium liquid levels, the state parameters such as quantity statistics of day part sampling jar 36, and data such as clock, calendar.Also export the running status that shows ebullator 33 in the above-mentioned sampling process, sampling pump 35, flow switch 34 etc. on the described man-machine interface 20.
According to above-mentioned state parameter, the staff can be by described man-machine interface 20, realize sampling control, parameter setting, unit test and reset, the input of operational orders such as data statistics and clean and maintenance.
When flow switch 34 monitors oil flow is not arranged in the circulation line, or sampling jar 36 high liquid levels, or filtrator 32 pressure reduction surpass qualification, and during situation such as voltage is improper, described PLC controller 10 sends alerting signal, make alarm lamp bright, and be supported on the man-machine interface 20 specifying with time of origin etc. of fault inquired about.
In sum, the automatic control system that is used for crude oil automatic on-line sampler of the present invention, use highly versatile, the PLC controller 10 that reliability is high, automatic sampling is accurately controlled to crude oil.Because flow constantly changes in the main oil pipeline 40, can automatically take a sample according to flow proportional for making sampler, under the control of described PLC controller 10, make the flow of described ebullator 33 and sampling pump 35 follow the trail of the trunk line flow in proportion synchronously, the flow control accuracy of especially described sampling pump 35 should satisfy system requirements, crude state during with the assurance sampling in the circulation line, be consistent with the crude oil time of day that flows through in the main oil pipeline 40, make the crude oil sample of being taken a sample have good representativeness.Described PLC controller 10 has control function such as sample managing and warning indication; Cooperate man-machine interface 20, also can realize operations such as parameter shows in the sampling process, state shows, control maintenance.
Although content of the present invention has been done detailed introduction by above preferred embodiment, will be appreciated that above-mentioned description should not be considered to limitation of the present invention.After those skilled in the art have read foregoing, for multiple modification of the present invention with to substitute all will be conspicuous.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (10)
1. automatic control system that is used for crude oil automatic on-line sampler, it is characterized in that, described automatic control system comprises PLC controller (10), and it is gone up the process of carrying out crude oil sampling by flow proportional to described sampler from main oil pipeline (40) and controls;
Described sampler comprises the circulation line that is connected with described main oil pipeline (40), the ebullator (33) that crude oil is flowed in described circulation line, and be connected with described circulation line, the sampling pump (35) of conveying crude oil sample;
Described PLC controller (10) is connected with described sampling pump (35), controls the proportional control of oil flow of the delivery rate and the described main oil pipeline (40) of described sampling pump (35).
2. the automatic control system that is used for crude oil automatic on-line sampler according to claim 1, it is characterized in that, described PLC controller (10) is connected with described ebullator (33), the crude oil flow velocity of controlling in the described circulation line of described ebullator (33) output is identical with the crude oil flow velocity of described main oil pipeline (40), and the proportional control of oil flow of the delivery rate of described ebullator (33) and described main oil pipeline (40).
3. as being used for the automatic control system of crude oil automatic on-line sampler as described in the claim 2, it is characterized in that described main oil pipeline (40) is provided with flowmeter (42); Described PLC controller (10) is connected with this flowmeter (42), receives the oil flow of the described main oil pipeline (40) of its transmission, as the reference value of sample flow proportional control.
4. as being used for the automatic control system of crude oil automatic on-line sampler as described in the claim 3, it is characterized in that described circulation line is provided with flow switch (34); Described PLC controller (10) is connected with described flow switch (34), receives and monitor the oil flow status signal in the described circulation line of its transmission.
5. as being used for the automatic control system of crude oil automatic on-line sampler as described in the claim 3, it is characterized in that, described circulation line is provided with some crude state pick-up units, it is connected respectively with described PLC controller (10), sends the sampling state parameter of crude oil in the described circulation line to it;
According to described sampling state parameter, described PLC controller (10) drives described sampler and adjusts, and described sampling state parameter is consistent with crude state parameter in the described main oil pipeline (40);
Described crude state pick-up unit comprises pressure unit (341) and temperature transmitter (342).
6. as being used for the automatic control system of crude oil automatic on-line sampler as described in the claim 3, it is characterized in that described sampler also comprises some sampling jars (36);
Described some sampling jars (36), by some sampling solenoid valves (351) that correspondence is provided with, the output terminal with described sampling pump (35) is connected respectively; When described solenoid valve (351) was opened, described sampling pump (35) injected crude oil sample in described sampling jar (36);
Described PLC controller (10) is connected with described some sampling solenoid valves (351) respectively, and controls the unlatching of described some sampling solenoid valves (351) or close.
7. as being used for the automatic control system of crude oil automatic on-line sampler as described in the claim 6, it is characterized in that described sampling jar (36) is provided with electronic weighing device (361); Described PLC controller (10) is connected with described electronic weighing device (361) respectively, receives and monitor the weight data of the described sampling jar (36) of its transmission; Described PLC controller (10) by real-time weight and the empty bottle weight of comparing described sampling jar (36), is judged the sample size of gathering in the described sampling jar (36).
8. as being used for the automatic control system of crude oil automatic on-line sampler as described in the claim 3, it is characterized in that described circulation line is provided with the filtrator (32) of band differential pressure transmitter; Described PLC controller (10) is connected with described differential pressure transmitter, and monitors the differential pressure value of described filtrator (32) both sides.
9. as being used for the automatic control system of crude oil automatic on-line sampler as described in the claim 3, it is characterized in that described sampler also comprises the purging system (39) that is communicated with described circulation line; Described PLC controller (10) is connected with described purging system (39), and monitors the medium liquid level in the described purging system (39).
10. as any automatic control system that is used for crude oil automatic on-line sampler in the claim 1 to 9, it is characterized in that described PLC controller (10) also is connected with a man-machine interface (20);
By described man-machine interface (20), provide operational order or carry out the adjustment of controlled variable to described PLC controller (10);
Described PLC controller (10) is controlled state parameter or alerting signal or the output demonstration of operational order on described man-machine interface (20) in the described sampling process.
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| CN 201010571389 CN102096387A (en) | 2010-12-03 | 2010-12-03 | Automatic control system used for crude oil automatic online sampler |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103364228A (en) * | 2012-04-11 | 2013-10-23 | 中国石油化工股份有限公司 | Auto-control high pressure crude oil sampling device |
| WO2015180144A1 (en) * | 2014-05-30 | 2015-12-03 | 昂纳自动化技术（深圳）有限公司 | Oil filling amount online detector |
| CN106596182A (en) * | 2015-10-20 | 2017-04-26 | 中国石油化工股份有限公司 | Composite probe for automatic crude oil sampler, and automatic crude oil sampler thereof |
| CN106840769A (en) * | 2017-02-24 | 2017-06-13 | 中国石油天然气集团公司 | Oil pipeline on-line period device |
| CN108254227A (en) * | 2018-02-01 | 2018-07-06 | 刘炀 | A kind of crude oil storage tank oil sample remote automatic acquisition device and acquisition method |
| CN108444759A (en) * | 2018-04-28 | 2018-08-24 | 济南热力集团有限公司 | A kind of water-coal-slurry sampler and sampling method |
| CN109650319A (en) * | 2018-12-21 | 2019-04-19 | 中国石油工程建设有限公司华北分公司 | Low wet crude joins metering system |
| CN110006706A (en) * | 2019-05-13 | 2019-07-12 | 北京百恒达石油技术有限公司 | Autosampler is used in RTC unloading sampling |
| CN110763523A (en) * | 2019-11-29 | 2020-02-07 | 四川鑫统领新材料有限公司 | Automatic sampling device and liquid raw material unloading pipeline in liquid raw material unloading process |
| CN113670664A (en) * | 2020-05-13 | 2021-11-19 | 力合科技（湖南）股份有限公司 | Automatic sampling and sample preparing device |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103364228A (en) * | 2012-04-11 | 2013-10-23 | 中国石油化工股份有限公司 | Auto-control high pressure crude oil sampling device |
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| CN106596182A (en) * | 2015-10-20 | 2017-04-26 | 中国石油化工股份有限公司 | Composite probe for automatic crude oil sampler, and automatic crude oil sampler thereof |
| CN106840769A (en) * | 2017-02-24 | 2017-06-13 | 中国石油天然气集团公司 | Oil pipeline on-line period device |
| CN108254227A (en) * | 2018-02-01 | 2018-07-06 | 刘炀 | A kind of crude oil storage tank oil sample remote automatic acquisition device and acquisition method |
| CN108444759A (en) * | 2018-04-28 | 2018-08-24 | 济南热力集团有限公司 | A kind of water-coal-slurry sampler and sampling method |
| CN109650319A (en) * | 2018-12-21 | 2019-04-19 | 中国石油工程建设有限公司华北分公司 | Low wet crude joins metering system |
| CN110006706A (en) * | 2019-05-13 | 2019-07-12 | 北京百恒达石油技术有限公司 | Autosampler is used in RTC unloading sampling |
| CN110006706B (en) * | 2019-05-13 | 2022-05-10 | 北京百恒达石油技术有限公司 | Automatic sampler for oil unloading and sampling of oil tank truck |
| CN110763523A (en) * | 2019-11-29 | 2020-02-07 | 四川鑫统领新材料有限公司 | Automatic sampling device and liquid raw material unloading pipeline in liquid raw material unloading process |
| CN113670664A (en) * | 2020-05-13 | 2021-11-19 | 力合科技（湖南）股份有限公司 | Automatic sampling and sample preparing device |
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Application publication date: 20110615 |