CN107015577A - A kind of fracturing blender truck constant-current voltage-stabilizing formula method for automatic controlling liquid level - Google Patents
A kind of fracturing blender truck constant-current voltage-stabilizing formula method for automatic controlling liquid level Download PDFInfo
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- CN107015577A CN107015577A CN201710173509.XA CN201710173509A CN107015577A CN 107015577 A CN107015577 A CN 107015577A CN 201710173509 A CN201710173509 A CN 201710173509A CN 107015577 A CN107015577 A CN 107015577A
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- liquid level
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D9/00—Level control, e.g. controlling quantity of material stored in vessel
- G05D9/12—Level control, e.g. controlling quantity of material stored in vessel characterised by the use of electric means
Abstract
A kind of fracturing blender truck constant-current voltage-stabilizing formula method for automatic controlling liquid level, methods described is used as the input parameter of Liquid level to introduce the suction pressure of suction pump in liquid level of blending vehicle control, coordinate level parameter, suction valve opening and suction revolution speed are controlled using liquid level and pressure double-closed-loop control method, in addition, valve opening feedback signal is added in liquid level closed loop again, flow feedback signal is added in pressure closed loop again, form tandem closed-loop control again in each closed loop, make the Liquid level of fracturing blender truck more rapidly, pressure and stability of flow.Solve level imbalance it is big when, liquid level regulation and control lag issues, the steady control of liquid level can be better achieved.
Description
Technical field
The present invention relates to the tank level control system of fracturing blender truck and method, more particularly to a kind of fracturing blender truck constant-current voltage-stabilizing formula liquid level
Automatic control system and control method.
Background technology
Fracturing blender truck is mainly used in liquid (can be clear water, base fluid etc.) and proppant (quartz sand in sand fracturing operation
Or haydite), additive (solid or liquid) mix by a certain percentage, the fracturing unit truck (group) into construction with certain pressure pump not
Carry out fracturing work than the fracturing fluid of, different viscosity with sand, the equipment be applied to the large and medium-sized oil well in land and gas field pressure break,
Acidizing treatment operation.And automatically controlling for liquid level is a particularly important ring in mulling vehicle control, traditional liquid level is automatic
Control be according to level imbalance come while the aperture for adjusting suction revolution speed and inlet valve realizes the dual regulation and control to liquid level, but
When deviation is larger, after suction valve regulation, suction pump, which remains unchanged, needs the regular hour just to can reach setting speed, to liquid level
Regulate and control delayed, followability poor.
The content of the invention
In order to overcome the deficiencies in the prior art, the present invention provides a kind of fracturing blender truck constant-current voltage-stabilizing formula automatic Control Systems of Liquids Height
And control method, for liquid level of blending vehicle automatic control system in oil-gas field fracturing operation process.In operation process, suction is pressed
Power is set to steady state value (such as 0.2MPa), according to liquid level rate of change PLC automatically adjust suction valve opening size, system further according to
Pressure condition regulation suction revolution speed.Compared with traditional liquid automatic control, the present invention solve level imbalance it is big when, liquid level
The lag issues of regulation and control, can be better achieved the steady control of liquid level.
In order to achieve the above object, the present invention is realized using following technical scheme：
A kind of fracturing blender truck constant-current voltage-stabilizing formula automatic Control Systems of Liquids Height, including PLC, touch-screen, liquid level sensor,
Pressure sensor, flow sensor, inlet valve and suction pump.
The liquid level sensor, pressure sensor, flow sensor, inlet valve and suction pump pass through cable connection PLC
Controller, touch-screen is attached with PLC by ethernet communication mode.
The liquid level sensor detects fracturing blender truck tank level signal, pressure sensor detection suction pump pressure signal, stream
Quantity sensor detects suction pump piping flow signal, and PLC receives liquid level sensor signal, pressure sensor signal, stream
Quantity sensor signal, controls the valve opening of inlet valve and the rotating speed of suction pump.
A kind of fracturing blender truck constant-current voltage-stabilizing formula method for automatic controlling liquid level, introduces the suction of suction pump in liquid level of blending vehicle control
Enter pressure as the input parameter of Liquid level, coordinate level parameter, using liquid level and pressure independently closed loop control method
Suction valve opening and suction revolution speed are controlled, in addition, valve opening feedback signal is added again in liquid level closed loop,
Flow feedback signal is added again in pressure closed loop, tandem closed-loop control is formd again in each closed loop, makes the liquid of fracturing blender truck
Position control more rapidly, pressure and stability of flow；The step of control method is used is as follows：
Step 1: setting liquid level sensor in fracturing blender truck tank, PLC reads fracturing blender truck tank by liquid level sensor
Interior liquid level information, meanwhile, tank level value is set in PLC control system, the liquid level of sensor detection is set with liquid level
After definite value is compared, difference is inputted into PID controller；
Step 2: output is adjusted according to the liquid level difference signal of input in the PID controller inside PLC, it is defeated
Go out the opening amount signal that signal is inlet valve；
Acted Step 3: 4~20 milliamperes of signals that inlet valve is exported according to PLC perform aperture, while the butterfly valve of valve is opened
Degree information feeds back to PLC control system with 4~20 milliamperes of signal forms, forms the closed-loop control of valve opening, and valve opening is closed
Ring and the tandem close loop control circuit of liquid level closed loop series formation liquid level-suction valve opening, are controlled to liquid level in fracturing blender truck tank
System；
Step 4: setting pressure sensor on suction line, PLC reads suction pump by pressure sensor
Suction pressure information, meanwhile, suction pressure is set in PLC control system, suction pressure and the setting of sensor are pressed
After power is compared, difference is inputted into PID controller；
Step 5: output is adjusted according to the pressure difference value signal of input in the PID controller inside PLC, it is defeated
Go out the tach signal that signal is suction pump；
Step 6: 4~20 milliamperes of signals that suction drive system of pump is exported according to PLC carry out rotational speed regulation to suction pump,
The changes in flow rate signal detected is fed back to PLC control system by flow sensor simultaneously, forms the pressure-flow string of suction pump
Level control system, is controlled to the input flow rate and pressure of mortar in fracturing blender truck tank.
This control method also ensure that mortar input pressure and flow while ensure that mortar level stability in tank
It is stable, mortar liquid level in tank is not produced great fluctuation process in regulation.
Compared with prior art, the beneficial effects of the invention are as follows：
Due to introducing suction pressure parameter in control process, the rotating speed of suction pump is adjusted according to suction pressure, due to pressure
Effect, when the rotating speed of suction pump is not compared to Stress control is added, actual speed is inhaled closer to setting speed in regulation process
Enter that pump lag time is shorter, followability is more preferable.On the basis of original double-closed-loop control, further reduce delayed show
As reducing level fluctuation, making Liquid level more steady, quick.
Brief description of the drawings
Fig. 1 is the fracturing blender truck constant pressure stable flow type automatic Control Systems of Liquids Height structural representation of the present invention；
Fig. 2 is the liquid level closed loop control method structure chart of the present invention；
Fig. 3 is the pressure closed loop control method structure chart of the present invention.
Embodiment
The embodiment provided below in conjunction with accompanying drawing the present invention is described in detail.
As shown in figure 1, a kind of fracturing blender truck constant-current voltage-stabilizing formula automatic Control Systems of Liquids Height, including PLC, touch-screen,
Liquid level sensor, pressure sensor, flow sensor, inlet valve and suction pump.
The liquid level sensor, pressure sensor, flow sensor, inlet valve and suction pump pass through cable connection PLC
Controller, touch-screen is attached with PLC by ethernet communication mode.
The liquid level sensor detects fracturing blender truck tank level signal, pressure sensor detection suction pump pressure signal, stream
Quantity sensor detects suction pump piping flow signal, and PLC receives liquid level sensor signal, pressure sensor signal, stream
Quantity sensor signal, controls the valve opening of inlet valve and the rotating speed of suction pump.
As shown in Figures 2 and 3, a kind of fracturing blender truck constant-current voltage-stabilizing formula method for automatic controlling liquid level, in liquid level of blending vehicle control
The middle suction pressure for introducing suction pump coordinates level parameter as the input parameter of Liquid level, is distinguished using liquid level and pressure
Closed loop control method is controlled to suction valve opening and suction revolution speed, in addition, adding valve again in liquid level closed loop
Door open degree feedback signal, flow feedback signal is added in pressure closed loop again, and tandem closed loop is formd again in each closed loop
Control, make the Liquid level of fracturing blender truck more rapidly, pressure and stability of flow；The step of control method is used is as follows：
Step 1: setting liquid level sensor in fracturing blender truck tank, PLC reads fracturing blender truck tank by liquid level sensor
Interior liquid level information, meanwhile, tank level value is set in PLC control system, the liquid level of sensor detection is set with liquid level
After definite value is compared, difference is inputted into PID controller；
Step 2: output is adjusted according to the liquid level difference signal of input in the PID controller inside PLC, it is defeated
Go out the opening amount signal that signal is inlet valve；
Acted Step 3: 4~20 milliamperes of signals that inlet valve is exported according to PLC perform aperture, while the butterfly valve of valve is opened
Degree information feeds back to PLC control system with 4~20 milliamperes of signal forms, forms the closed-loop control of valve opening, and valve opening is closed
Ring and the tandem close loop control circuit of liquid level closed loop series formation liquid level-suction valve opening, are controlled to liquid level in fracturing blender truck tank
System；
Step 4: setting pressure sensor on suction line, PLC reads suction pump by pressure sensor
Suction pressure information, meanwhile, suction pressure is set in PLC control system, suction pressure and the setting of sensor are pressed
After power is compared, difference is inputted into PID controller；
Step 5: output is adjusted according to the pressure difference value signal of input in the PID controller inside PLC, it is defeated
Go out the tach signal that signal is suction pump；
Step 6: 4~20 milliamperes of signals that suction drive system of pump is exported according to PLC carry out rotational speed regulation to suction pump,
The changes in flow rate signal detected is fed back to PLC control system by flow sensor simultaneously, forms the pressure-flow string of suction pump
Level control system, is controlled to the input flow rate and pressure of mortar in fracturing blender truck tank.
This control method also ensure that mortar input pressure and flow while ensure that mortar level stability in tank
It is stable, mortar liquid level in tank is not produced great fluctuation process in regulation.
The present invention control process be：
1st, level set value and suction pressure setting value are set by display screen first, will by display screen or guidance panel
Suction is set to automatic control state.The signal of liquid level sensor is sent to PLC in real time, and system constantly examines liquid level sensor
The level value measured is made comparisons with setting value draws level imbalance, and calculates the rate of change of liquid level.It is inclined in different liquid levels
Under difference, different liquid level rate of change correspondences are converted into the different opening angle angle value of inlet valve, meanwhile, motorized adjustment butterfly valve is detected
To valve opening signal made comparisons with the inlet valve opening value, must deviate, the signal function after being handled through pid algorithm is in suction
Enter valve, so as to change the aperture of inlet valve.
2nd, the rotating speed of suction pump is determined by suction setup pressure value, and system detects suction pressure signal and pressed with setting in real time
Force value is made comparisons, and suction pressure deviation signal is handled by pid algorithm, and the displacement signal for being converted into suction pump acts on suction
Pump, so as to change suction revolution speed.
Arranged by the liquid level rate of change regulation suction valve opening under different level imbalances, suction pressure bias adjustment suction pump
Measure to realize the control accurate to sucking discharge capacity, and when deviation is larger, due to the introducing of suction pressure parameter, it is ensured that suction
The rotating speed of pump is quickly followed, and reduces the lag time of suction pump as far as possible, accurately, timely regulates and controls liquid level with full
The requirement of sufficient level set value.
Above example is implemented lower premised on technical solution of the present invention, gives detailed embodiment and tool
The operating process of body, but protection scope of the present invention is not limited to the above embodiments.Method therefor is such as without spy in above-described embodiment
It is conventional method not mentionlet alone bright.
Claims (1)
1. a kind of fracturing blender truck constant-current voltage-stabilizing formula method for automatic controlling liquid level, it is characterised in that introduced in liquid level of blending vehicle control
The suction pressure of suction pump is coordinated level parameter, independently closed using liquid level and pressure as the input parameter of Liquid level
Ring control method is controlled to suction valve opening and suction revolution speed, in addition, adding valve opening again in liquid level closed loop
Feedback signal, flow feedback signal is added in pressure closed loop again, is formd tandem closed-loop control again in each closed loop, is made
The Liquid level of fracturing blender truck more rapidly, pressure and stability of flow；The step of control method is used is as follows：
Step 1: setting liquid level sensor in fracturing blender truck tank, PLC reads liquid in fracturing blender truck tank by liquid level sensor
Position information, meanwhile, tank level value is set in PLC control system, the liquid level and level set value of sensor detection
After being compared, difference is inputted into PID controller；
Step 2: output, output letter is adjusted according to the liquid level difference signal of input in the PID controller inside PLC
Number be inlet valve opening amount signal；
Acted Step 3: 4~20 milliamperes of signals that inlet valve is exported according to PLC perform aperture, while the butterfly valve opening letter of valve
Breath feeds back to PLC control system with 4~20 milliamperes of signal forms, forms the closed-loop control of valve opening, valve opening closed loop with
The tandem close loop control circuit of liquid level closed loop series formation liquid level-suction valve opening, is controlled to liquid level in fracturing blender truck tank；
Step 4: setting pressure sensor on suction line, PLC reads the suction of suction pump by pressure sensor
Pressure information, meanwhile, suction pressure is set in PLC control system, suction pressure and the setting pressure of sensor enter
After going relatively, difference is inputted into PID controller；
Step 5: output, output letter is adjusted according to the pressure difference value signal of input in the PID controller inside PLC
Number be suction pump tach signal；
Step 6: 4~20 milliamperes of signals that suction drive system of pump is exported according to PLC carry out rotational speed regulation to suction pump, simultaneously
The changes in flow rate signal detected is fed back to PLC control system by flow sensor, forms the pressure-flow tandem control of suction pump
System processed, is controlled to the input flow rate and pressure of mortar in fracturing blender truck tank；
This control method also ensure that the stabilization of mortar input pressure and flow while ensure that mortar level stability in tank,
Mortar liquid level in tank is set not produce great fluctuation process in regulation.
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| CN201710173509.XA CN107015577A (en) | 2017-03-22 | 2017-03-22 | A kind of fracturing blender truck constant-current voltage-stabilizing formula method for automatic controlling liquid level |
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| CN201710173509.XA CN107015577A (en) | 2017-03-22 | 2017-03-22 | A kind of fracturing blender truck constant-current voltage-stabilizing formula method for automatic controlling liquid level |
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Cited By (3)
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| CN111158304A (en) * | 2019-12-31 | 2020-05-15 | 陕西神渭煤炭管道运输有限责任公司 | Slurry pipeline conveying cascade control system and control method thereof |
| CN116022871A (en) * | 2023-02-21 | 2023-04-28 | 昆明理工大学 | Water purification treatment cascade feedback PLC automatic control system and control method thereof |
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| CN111158304A (en) * | 2019-12-31 | 2020-05-15 | 陕西神渭煤炭管道运输有限责任公司 | Slurry pipeline conveying cascade control system and control method thereof |
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| CN116022871B (en) * | 2023-02-21 | 2024-04-12 | 昆明理工大学 | Water purification treatment cascade feedback PLC automatic control system and control method thereof |
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