CN108100982B - Locomotive automation unloads EFM Electronic Fuel Management and control method - Google Patents
Locomotive automation unloads EFM Electronic Fuel Management and control method Download PDFInfo
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- CN108100982B CN108100982B CN201711424482.3A CN201711424482A CN108100982B CN 108100982 B CN108100982 B CN 108100982B CN 201711424482 A CN201711424482 A CN 201711424482A CN 108100982 B CN108100982 B CN 108100982B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B67—OPENING, CLOSING OR CLEANING BOTTLES, JARS OR SIMILAR CONTAINERS; LIQUID HANDLING
- B67D—DISPENSING, DELIVERING OR TRANSFERRING LIQUIDS, NOT OTHERWISE PROVIDED FOR
- B67D7/00—Apparatus or devices for transferring liquids from bulk storage containers or reservoirs into vehicles or into portable containers, e.g. for retail sale purposes
- B67D7/06—Details or accessories
- B67D7/08—Arrangements of devices for controlling, indicating, metering or registering quantity or price of liquid transferred
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B67—OPENING, CLOSING OR CLEANING BOTTLES, JARS OR SIMILAR CONTAINERS; LIQUID HANDLING
- B67D—DISPENSING, DELIVERING OR TRANSFERRING LIQUIDS, NOT OTHERWISE PROVIDED FOR
- B67D7/00—Apparatus or devices for transferring liquids from bulk storage containers or reservoirs into vehicles or into portable containers, e.g. for retail sale purposes
- B67D7/06—Details or accessories
- B67D7/32—Arrangements of safety or warning devices; Means for preventing unauthorised delivery of liquid
Abstract
Locomotive automation unloads EFM Electronic Fuel Management and control method, belongs to railway locomotive servicing work field, and the present invention is to unload to be put in storage and receive remote signal control realization automatic oil discharge in railway locomotive servicing work fuel oil.The present invention includes centralized control system PLC, petroleum pipeline electrically operated valve, trestle operation post, liquid level sensor, frequency-changing control system, discharge pump, pressure transmitter and flow switch；The pressure signal adjustment that centralized control system PLC is sent according to pressure transmitter is sent to the order of frequency-changing control system；The liquid level signal adjustment that centralized control system PLC is sent according to liquid level sensor is sent by the order of frequency-changing control system；The starting that the flow switch signal and trestle operation post that centralized control system PLC is sent according to flow switch are sent/stop signal control petroleum pipeline electrically operated valve ON/OFF and starting/stopping frequency-changing control system.
Description
Technical field
The invention belongs to railway locomotive servicing work field, it is related to fuel oil and unloads the control technique of storage.
Background technique
Existing fuel oil unload Input System mainly by oil crane tube, unloading rack, discharge pump, sweep base oil pump, flowmeter, valve
Door, station, oil storage tank and connecting pipeline composition.
Existing work flow are as follows: the parking of tank car face oil crane, after oily crane is inserted into tank car, trestle operator notice
Pump house operator opens oil pump, starts emptying；When the oil in tank car is emptied by oil crane tube fastly, the operator on trestle is logical
Know that pump house operator stops discharge pump；Trestle operator notifies pump base oil hose connection tank car oil collect port is swept after connecting
Room operator, which opens, sweeps base oil pump；Notice pump house operator stops sweeping after the oil product that platform operator observes in tank car is evacuated
Base oil pump completes an emptying job.
The work flow of existing emptying is since discharge pump and station are far from this operation field of trestle, and unloading line is very
Long, there are air gaps in pipeline, and then influence the efficiency and success rate of emptying.The work flow of existing emptying is by trestle
Operator's artificial observation emptying process, according to artificial judgment stopping/starting correlation operation, operation process is by personnel's subjective factor shadow
Sound is bigger；In addition, operator at two realizes information transmitting, people by calling since trestle and pump house are apart from distant
Operated that there is also the reaction time again after being connected to information, therefore information cannot be accessed and is immediately performed, and then be caused each
The cooperation of link influences emptying effect there are the time difference, stops immediately when can not reach tank truck emptying, can not guarantee oil
The canned full effect stopped immediately.
Summary of the invention
The invention aims to avoid the impact due to entering oil product so that tank level generates the phenomenon that fluctuating, effectively
Guarantee that oil product liquid level stablizes rising in oil storage tank, the sensor installed in the oil tank liquid level oil supply tank skin and oil tank steadily risen
Impact force meeting very little, extends the service life of oil tank and sensor.Oil-free situation inside tank truck is avoided simultaneously, by air
Petroleum pipeline is sucked, emptying next time is influenced, a kind of locomotive automation is provided and unloads EFM Electronic Fuel Management and control method, the present invention
It is to unload to be put in storage and receive remote signal control realization automatic oil discharge in railway locomotive servicing work fuel oil.
Locomotive automation of the present invention unloads EFM Electronic Fuel Management, including centralized control system PLC, petroleum pipeline motor-driven valve
Door, trestle operation post, liquid level sensor, frequency-changing control system, discharge pump, pressure transmitter and flow switch；
Trestle operation post is provided with emptying starting/shutdown switch；
Liquid level sensor measures the oil product liquid level in oil storage tank；
Petroleum pipeline electrically operated valve is connected on unloading line；
Flow switch is located on petroleum pipeline, and whether have oil product flow through, flow switch is located at oil transportation if measuring in petroleum pipeline
The oil inlet side of pipeline；Oil product pressure in pressure transmitter measurement petroleum pipeline；
Frequency-changing control system controls emptying pump work according to the order that centralized control system PLC is sent；
The pressure signal adjustment that centralized control system PLC is sent according to pressure transmitter is sent to the life of frequency-changing control system
It enables；
The liquid level signal adjustment that centralized control system PLC is sent according to liquid level sensor is sent by the life of frequency-changing control system
It enables；
The starting that the flow switch signal and trestle operation post that centralized control system PLC is sent according to flow switch are sent/
The ON/OFF and starting/stopping frequency-changing control system of stop signal control petroleum pipeline electrically operated valve.
It preferably, further include pressure sensor, at the pressure sensor setting petroleum pipeline fuel pump outlet, pressure sensing
The pressure signal of device monitoring is sent to frequency-changing control system, and frequency-changing control system is defeated according to the signal adjustment that pressure sensor is fed back
Control command out.
It preferably, further include PC monitor supervision platform, the PC monitor supervision platform with centralized control system plc communication by remotely obtaining
Take trestle emptying working condition.
It preferably, further include temperature sensor, the temperature inside the temperature sensor detection oil storage tank, centralized control system
System PLC acquires the temperature and is sent to PC monitor supervision platform.
It preferably, further include sweeping bottom pump and sweeping bottom control system；It is provided on trestle operation post simultaneously and sweeps bottom and start/stop
Only button；In emptying EP (end of program), bottom control is swept in the enabling signal control that centralized control system PLC is sent according to trestle operation post
System processed starts to sweep bottom program.
Above-mentioned locomotive automation unloads the control method that EFM Electronic Fuel Management realizes emptying control:
When centralized control system PLC receives the enabling signal that the emptying starting on trestle operation post/shutdown switch issues
When, start emptying program；
Startup stage: centralized control system PLC acquires the liquid level of liquid level sensor, when the liquid level is lower than highest liquid level
When, control petroleum pipeline electrically operated valve is opened, while being started control frequency-changing control system driving discharge pump normal speed and being started to take out
Oil；
During emptying, centralized control system PLC acquires the liquid level of liquid level sensor in real time, and according to the liquid level tune
The working condition of whole frequency-changing control system driving discharge pump, specifically:
When the liquid level is less than the 3/4 of highest liquid level, control frequency-changing control system drives discharge pump normal speed work
Make；
When the liquid level is not less than the 3/4 of highest liquid level, control frequency-changing control system drives discharge pump tick-over；
When the liquid level is not less than the 5/6 of highest liquid level, control frequency-changing control system driving discharge pump Ultra-Low Speed work；
When the liquid level is not less than the 9/10 of highest liquid level, control frequency-changing control system driving discharge pump start-up study stops
It only works, completes emptying.
Preferably, the tick-over refers to that speed is the 3/4 of normal speed；The Ultra-Low Speed work, refers to that speed is
The 1/2 of normal speed.
Preferably, it is described delay stop working refer to maintain speed work set time T after, stop working, close simultaneously
Petroleum pipeline electrically operated valve is closed, emptying is completed；
The set time T, the rate of pumping according to the volume of oil storage tank and discharge pump are related, it may be assumed that are counted according to theory
It calculates, the oil mass that discharge pump extracts under Ultra-Low Speed working condition in time T is the oil reserve of 1/10 height of oil storage tank.
Preferably, during emptying, centralized control system PLC acquires the switching signal of flow switch in real time, when described
Switching signal is in off state in duration t, then centralized control system PLC control control frequency-changing control system stops work
Make, while controlling the closing of petroleum pipeline electrically operated valve；
Above-mentioned time t is determined according to the distance between flow switch and petroleum pipeline electrically operated valve, guarantees petroleum pipeline
When electrically operated valve is closed, internal there are also oil products to store.
Preferably, during emptying, centralized control system PLC acquires the pressure signal of pressure transmitter transmission in real time,
And the working condition of discharge pump is driven according to the pressure signal real-time control frequency-changing control system, realize constant pressure emptying.
Beneficial effects of the present invention:
For railway locomotive servicing work demand, unloads fuel oil and be put in storage and receive the technique stream of remote signal control emptying
Journey has designed and developed centralized control system, reduces human cost, improves reliability.
Transportation Process pipeline flow path control valve uses electrically operated valve, to automatically control service.
Pressure sensor is set at petroleum pipeline fuel pump outlet, and frequency control unit is given in pressure signal negative-feedback, realizes permanent
Pressure, constant flow oil transportation avoid over pressure from damaging oil pipeline, and pressure, which is stablized, to be had convenient for improving the accuracy of oil transportation metering.
At trestle design vacuurn-centrifugal pump starting/stop button, an emptying personnel can be realized vacuurn-centrifugal pump starting/
It stops operation, it is quick in time, reduce personnel cost.
Liquid level sensor is devised in tank field, liquid level sensor sends liquid level data to control system by transmitter,
It realizes according to Liquid level discharge velocity and stops being automatically brought into operation for emptying.
In Oil Tank Design temperature sensor, temperature sensor sends temperature data to control system by transmitter,
Realize oil product overtemperature alarm in oil tank.
In Oil Tank Design pressure sensor, pressure sensor sends pressure data to control system by transmitter,
Oil product real-time density value can be calculated by temperature, pressure, liquid level, the strapping table of density value and oil tank can export oil reserve and
Unused storage space.
Detailed description of the invention
Fig. 1 is the control principle block diagram that locomotive automation of the present invention unloads EFM Electronic Fuel Management.
Specific embodiment
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings and examples, how to apply to the present invention whereby
Technological means solves technical problem, and the realization process for reaching technical effect can fully understand and implement.It needs to illustrate
As long as not constituting conflict, each feature in each embodiment and each embodiment in the present invention can be combined with each other,
It is within the scope of the present invention to be formed by technical solution.
The present invention is to unload to be put in storage and receive remote signal control realization automatic oil discharge in railway locomotive servicing work fuel oil.
It includes centralized control system PLC, petroleum pipeline electrically operated valve, trestle operation that locomotive automation, which unloads EFM Electronic Fuel Management,
Column, tank field liquid level sensor, frequency-changing control system, discharge pump, pressure transmitter and flow switch.
Trestle operation post is provided with emptying starting/shutdown switch；
Tank field liquid level sensor measures the oil product liquid level in oil storage tank；
Petroleum pipeline electrically operated valve is connected on unloading line；
Flow switch is located on petroleum pipeline, and whether have oil product flow through, flow switch is located at oil transportation if measuring in petroleum pipeline
The oil inlet side of pipeline；Oil product pressure in pressure transmitter measurement petroleum pipeline；
Frequency-changing control system controls emptying pump work according to the order that centralized control system PLC is sent；
The pressure signal adjustment that centralized control system PLC is sent according to pressure transmitter is sent to the life of frequency-changing control system
It enables；
The liquid level signal adjustment that centralized control system PLC is sent according to tank field liquid level sensor is sent by frequency-changing control system
Order；
The starting that the flow switch signal and trestle operation post that centralized control system PLC is sent according to flow switch are sent/
The ON/OFF and starting/stopping frequency-changing control system of stop signal control petroleum pipeline electrically operated valve.
Locomotive automation, which unloads, can also increase warning device in EFM Electronic Fuel Management, the warning device is in centralized control system
Alert under the control of PLC.
Locomotive automation, which unloads, can also increase tank field pressure sensor in EFM Electronic Fuel Management, centralized control system PLC according to
The pressure signal adjustment that tank field pressure sensor is sent is sent to the order of frequency-changing control system.
Locomotive automation, which unloads, can also increase PC monitor supervision platform in EFM Electronic Fuel Management, which is arranged in administrator
In the office of member, the working condition of information and frequency-changing control system that centralized control system PLC acquires all the sensors
It is sent to PC monitor supervision platform, administrative staff is enable remotely to obtain the working condition that locomotive automation unloads EFM Electronic Fuel Management.
Locomotive automation, which unloads, can also increase tank field temperature sensor in EFM Electronic Fuel Management, detect the temperature inside oil storage tank
Degree, centralized control system PLC acquire the temperature and are sent to PC monitor supervision platform.
Locomotive automation, which unloads EFM Electronic Fuel Management and can also increase, sweeps bottom control system, while being provided on trestle operation post
Bottom starting/stop button is swept, in emptying EP (end of program), centralized control system PLC control sweeps bottom control system and starts to sweep bottom journey
Sequence, referring specifically to number of patent application be 201710978313.8,201721341782.0 patent document record sweep bottom control
System, method.Bottom control system is swept in increase, and the starting of the control system/stopping control button being put with emptying control button
Together, may be implemented in this way emptying process with sweep being connected for basic skill or training's sequence, bottom can be swept simultaneously when completing emptying with quick start, it is real
Existing emptying and sweep basic skill or training's sequence be connected automatically, continuous control, tank truck oil-discharging overall time, reduction operator can be saved.
The data of collection are carried out integration processing by PC monitor supervision platform, can reach examinations oil tank level, in oil storage tank
Oil product temperature, unload oil condition implementation monitoring, display, can also to these acquisition Data Integration analysis etc. work, such as: prison
Tank level, oil product temperature and density measure real-time display function are surveyed, there is oil leak, quality, storage, oil inlet quantity, fuel-displaced
Real-time display, monitoring, the management function of amount, total measurement (volume), actual volume, empty volume.Time of fire alarming and alarm storage can be automatically recorded
Tank can also carry out display and printing, high high liquid level, low low liquid level warning of tank field report etc., realize flow container area procedure information
Acquisition, monitoring and data management and valve automatic control function.
Above-mentioned locomotive automation unloads the control method that EFM Electronic Fuel Management realizes emptying control:
When centralized control system PLC receives the enabling signal that the emptying starting on trestle operation post/shutdown switch issues
When, start emptying program；
Startup stage: centralized control system PLC acquires the liquid level of tank field liquid level sensor, when the liquid level is lower than highest liquid
When position, control petroleum pipeline electrically operated valve is opened, while being started control frequency-changing control system driving discharge pump normal speed and being started
Oil pumping；
During emptying, centralized control system PLC acquires the liquid level of tank field liquid level sensor in real time, and according to the liquid
The working condition of position adjustment frequency-changing control system driving discharge pump, specifically:
When the liquid level is less than the 3/4 of highest liquid level, control frequency-changing control system drives discharge pump normal speed work
Make；
When the liquid level is not less than the 3/4 of highest liquid level, control frequency-changing control system drives discharge pump tick-over；
When the liquid level is not less than the 5/6 of highest liquid level, control frequency-changing control system driving discharge pump Ultra-Low Speed work；
When the liquid level is not less than the 9/10 of highest liquid level, control frequency-changing control system driving discharge pump start-up study stops
It only works, completes emptying.
Above-mentioned tick-over refers to that speed is the 3/4 of normal speed.Above-mentioned Ultra-Low Speed work, refers to that speed is positive constant speed
The 1/2 of degree.
Above-mentioned delay stop working refer to maintain speed work set time T after, stop working, simultaneously close off petroleum pipeline
Line electrically operated valve completes emptying.The set time T, the rate of pumping according to the volume of oil storage tank and discharge pump is related,
That is: according to theoretical calculation, the oil mass that discharge pump extracts under Ultra-Low Speed working condition in time T is 1/10 height of oil storage tank
Oil reserve.
During emptying, according to the variation of the liquid level inside oil storage tank, the operating rate of discharge pump is adjusted, it may be assumed that with
The raising of liquid level in oil storage tank, interim slows down discharge velocity, it may be assumed that slow down the speed that oil product enters oil storage tank, avoid due to
Into oil product impact so that the phenomenon that tank level generates fluctuation, oil product liquid level be effectively ensured in oil storage tank stablize and rise, put down
The impact force meeting very little for the sensor installed in the oil tank liquid level oil supply tank skin and oil tank surely risen, extension oil tank and sensor
Service life.Oil tank liquid level is steady, collected data stabilization, guarantees control reliability, continues reliably to run, not only save
The emptying time, moreover it is possible to guarantee tank truck oil-discharging it is more thorough, it is more labor-saving, save operation cost.
During emptying, centralized control system PLC acquires the switching signal of flow switch in real time, when the switching signal
It is in off state in duration t, then centralized control system PLC control control frequency-changing control system stops working, simultaneously
Petroleum pipeline electrically operated valve is controlled to close.The signal of flow switch output is in off state, then means do not have in petroleum pipeline
Oil product is conveying, therefore to stop emptying process.
Above-mentioned time t is determined according to the distance between flow switch and petroleum pipeline electrically operated valve, guarantees petroleum pipeline
When electrically operated valve is closed, internal there are also oil products to store.That is: oil-free situation inside tank truck is avoided, is drawn air into defeated
Oil pipeline influences emptying next time, because if there is air in petroleum pipeline, then needs to say before emptying empty in petroleum pipeline
Then gas emptying carries out emptying operation again, so if ensure in oil transportation route to be all oil product, then be not necessarily to before each emptying into
Row emptying operation, saves the time.
During emptying, centralized control system PLC acquires the pressure signal of pressure transmitter transmission in real time, and according to this
Pressure signal real-time control frequency-changing control system drives the working condition of discharge pump, realizes constant pressure emptying.When the pressure signal is prominent
When so becoming smaller, centralized control system PLC control frequency-changing control system stops working, while starting warning device alarm.Oil discharge pipe
The suddenly change of pressure in road, it may be possible to Leakage occur, warning note is needed to overhaul emptying route.The unexpected change
It is small, refer to that the pressure signal difference of front and back acquisition is significantly greater than the situation of the pressure transformation difference of system permission.
During emptying, when centralized control system PLC receives the emptying starting on trestle operation post/shutdown switch hair
When stop signal out, stop emptying program, centralized control system PLC control frequency-changing control system stops working, controls simultaneously
Petroleum pipeline electrically operated valve is closed.
In startup stage, centralized control system PLC further judges while controlling petroleum pipeline electrically operated valve opening
The liquid level, and drive discharge pump to start work at different rates according to Liquid level frequency-changing control system, specifically:
When the liquid level is less than the 3/4 of highest liquid level, control frequency-changing control system driving discharge pump normal speed is opened
It is dynamic to start to pump；
When the liquid level is not less than the 3/4 of highest liquid level, control frequency-changing control system driving discharge pump low rate start is opened
Begin to pump；
When the liquid level is not less than the 5/6 of highest liquid level, control frequency-changing control system driving discharge pump Ultra-Low Speed starting
Start to pump.
Although disclosed herein embodiment it is as above, the content is only to facilitate understanding the present invention and adopting
Embodiment is not intended to limit the invention.Any those skilled in the art to which this invention pertains are not departing from this
Under the premise of the disclosed spirit and scope of invention, any modification and change can be made in the implementing form and in details,
But scope of patent protection of the invention, still should be subject to the scope of the claims as defined in the appended claims.
Claims (9)
1. locomotive automation emptying control method, it includes centralized control system that the locomotive automation that this method uses, which unloads EFM Electronic Fuel Management,
Unite PLC, petroleum pipeline electrically operated valve, trestle operation post, liquid level sensor, frequency-changing control system, discharge pump, pressure transmitter and
Flow switch；
Trestle operation post is provided with emptying starting/shutdown switch；
Liquid level sensor measures the oil product liquid level in oil storage tank；
Petroleum pipeline electrically operated valve is connected on unloading line；
Flow switch is located on petroleum pipeline, and whether have oil product flow through, flow switch is located at petroleum pipeline if measuring in petroleum pipeline
Oil inlet side；Oil product pressure in pressure transmitter measurement petroleum pipeline；
Frequency-changing control system controls emptying pump work according to the order that centralized control system PLC is sent；
The pressure signal adjustment that centralized control system PLC is sent according to pressure transmitter is sent to the order of frequency-changing control system；
The liquid level signal adjustment that centralized control system PLC is sent according to liquid level sensor is sent to the order of frequency-changing control system；
Starting/stopping that the flow switch signal and trestle operation post that centralized control system PLC is sent according to flow switch are sent
The ON/OFF and starting/stopping frequency-changing control system of signal control petroleum pipeline electrically operated valve；
It is characterized in that, the locomotive automation emptying control method are as follows:
When centralized control system PLC receives the enabling signal that the emptying starting on trestle operation post/shutdown switch issues, open
Dynamic emptying program；
Startup stage: centralized control system PLC acquires the liquid level of liquid level sensor, when the liquid level is lower than highest liquid level, control
Petroleum pipeline electrically operated valve processed is opened, while being started control frequency-changing control system driving discharge pump normal speed and being started to pump；
During emptying, centralized control system PLC acquires the liquid level of liquid level sensor in real time, and is adjusted and become according to the liquid level
Frequency control system drives the working condition of discharge pump, specifically:
When the liquid level is less than the 3/4 of highest liquid level, control frequency-changing control system driving discharge pump normal speed work；
When the liquid level is not less than the 3/4 of highest liquid level, control frequency-changing control system drives discharge pump tick-over；
When the liquid level is not less than the 5/6 of highest liquid level, control frequency-changing control system driving discharge pump Ultra-Low Speed work；
When the liquid level is not less than the 9/10 of highest liquid level, control frequency-changing control system driving discharge pump start-up study stops work
Make, completes emptying.
2. locomotive automation emptying control method according to claim 1, which is characterized in that system further includes pressure sensing
Device, the pressure sensor are arranged at petroleum pipeline fuel pump outlet, and the pressure signal of pressure sensor monitoring is sent to frequency conversion control
System processed, the signal adjustment output control command that frequency-changing control system is fed back according to pressure sensor.
3. locomotive automation emptying control method according to claim 1, which is characterized in that system further includes that PC monitoring is flat
Platform, the PC monitor supervision platform is by remotely obtaining trestle emptying working condition with centralized control system plc communication.
4. locomotive automation emptying control method according to claim 3, which is characterized in that system further includes temperature sensing
Device, the temperature sensor detect the temperature inside oil storage tank, and centralized control system PLC acquires the temperature and is sent to PC monitoring
Platform.
5. locomotive automation emptying control method according to claim 1, which is characterized in that system further includes sweeping bottom pump and sweeping
Bottom control system；It is provided on trestle operation post simultaneously and sweeps bottom starting/stop button；In emptying EP (end of program), control is concentrated
The enabling signal control that system PLC processed is sent according to trestle operation post sweeps bottom control system and starts to sweep bottom program.
6. locomotive automation emptying control method according to claim 1, which is characterized in that the tick-over refers to
Speed is the 3/4 of normal speed；The Ultra-Low Speed work, refers to that speed is the 1/2 of normal speed.
7. locomotive automation emptying control method according to claim 1, which is characterized in that the delay stops working and is
Refer to after maintaining speed work set time T, stops working, simultaneously close off petroleum pipeline electrically operated valve, complete emptying；
The set time T, the rate of pumping according to the volume of oil storage tank and discharge pump are related, it may be assumed that according to theoretical calculation, In
The oil mass that discharge pump extracts under Ultra-Low Speed working condition in time T is the oil reserve of 1/10 height of oil storage tank.
8. locomotive automation emptying control method according to claim 1, which is characterized in that during emptying, concentrate
Control system PLC acquires the switching signal of flow switch in real time, when the switching signal is closing shape in duration t
State, then centralized control system PLC controls frequency-changing control system and stops working, while controlling the closing of petroleum pipeline electrically operated valve；
Above-mentioned time t is determined according to the distance between flow switch and petroleum pipeline electrically operated valve, guarantees that petroleum pipeline is electronic
When valve is closed, internal there are also oil products to store.
9. locomotive automation emptying control method according to claim 1, which is characterized in that during emptying, concentrate
Control system PLC acquires the pressure signal of pressure transmitter transmission in real time, and according to the pressure signal real-time control frequency control
The working condition of system drive discharge pump realizes constant pressure emptying.
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| CN110597324A (en) * | 2019-07-18 | 2019-12-20 | 北京航天发射技术研究所 | Transfer control system and method |
| CN110975400B (en) * | 2019-12-26 | 2022-03-04 | 广东电网能源发展有限公司 | Vacuum oil filter |
| CN112255979A (en) * | 2020-10-19 | 2021-01-22 | 邢台旭阳煤化工有限公司 | Control method and system for oil product loading |
| CN114604816A (en) * | 2020-12-08 | 2022-06-10 | 中国石油天然气集团有限公司 | Oil product unloading system |
| CN114017678B (en) * | 2021-11-05 | 2022-06-07 | 天津东方泰瑞科技有限公司 | Storage tank valve and shipboard pump valve interlocking control system and method |
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