CN112162482A - Intelligent combined optimization rectifying device and method suitable for complex flow field and application - Google Patents
Intelligent combined optimization rectifying device and method suitable for complex flow field and application Download PDFInfo
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Abstract
The invention discloses an intelligent combined optimization rectifying device adapting to a complex flow field, a method and application thereof.A fluid storage container in the device is connected with a water pump through a pipeline, the water pump, a defoaming tank, a pneumatic regulating valve and an electromagnetic flowmeter are sequentially connected through the pipeline, and a liquid level meter is connected with a water pump optimization regulator and sends liquid level data of fluid in the fluid storage container to the water pump optimization regulator; the water pump optimization regulator is connected with the water pump and controls the rotating speed of the water pump in real time according to the power supply frequency, the liquid level data and each flow detection point; the pressure gauge is positioned on a pipeline connected with the defoaming tank, the pneumatic regulating valve and the electromagnetic flowmeter, and is connected with the pneumatic regulating valve optimizing regulator and sends pipeline pressure data to the pneumatic regulating valve optimizing regulator; the pneumatic regulating valve optimizing regulator is connected with the pneumatic regulating valve and controls the opening of the pneumatic regulating valve in real time according to the indicating value of the electromagnetic flowmeter, the pressure data of each pipeline and each flow detection point. The invention can carry out combined optimized regulation and control on the water pump and the pneumatic regulating valve, has better rectification effect and is suitable for complex flow fields.
Description
Technical Field
The invention relates to the technical field of flow regulation, in particular to an intelligent combined optimized rectifying device suitable for a complex flow field, a method and application thereof.
Background
Flow meters are meters used to measure fluid flow and are widely used in industrial production and daily life. Before the flowmeter enters the market, whether a product is qualified or not needs to be checked, and during checking, because the fluid flow is a dynamic quantity, the flow rate, the flow state, the pressure and the like of the flowmeter are easy to cause unstable flow, the fluid flow is required to be regulated and controlled to be stable and reach a detection point so as to check the flowmeter and avoid influencing the checking accuracy. At present, the purpose of variable frequency speed regulation and voltage stabilization is achieved by changing the power supply frequency through a frequency converter so as to change the rotating speed of a water pump. However, compared with the stability required by the calibration standard, the variable-frequency speed-regulating voltage stabilization method has the defects that the stability is poor when the instantaneous flow is detected and the required stability cannot be achieved because the frequency converter outputs the pulse width modulation wave with the frequency change of the fundamental wave (sine wave) and the measured pulse flow is the pulse flow.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide the intelligent combined optimization rectifying device suitable for the complex flow field, which can be used for performing combined optimization regulation and control on a water pump and a pneumatic regulating valve and has a better rectifying effect.
The second purpose of the invention is to provide an intelligent combined optimization rectification method suitable for a complex flow field, which controls the flow based on the influence factors of various fluid flows and is beneficial to improving the regulation precision and accuracy of the flow.
The third purpose of the invention is to provide the application of the intelligent combined optimization rectifying device suitable for the complex flow field.
The first purpose of the invention is realized by the following technical scheme: an intelligent combined optimized rectifier device adapted to a complex flow field, comprising: the device comprises a water pump, a defoaming tank, a water pump optimization regulator, a liquid level meter, a first pressure meter, a second pressure meter, a third pressure meter, an electromagnetic flow meter, a pneumatic regulating valve and a pneumatic regulating valve optimization regulator, wherein the input end of the water pump is connected with a fluid storage container storing fluid through a pipeline, the output end of the water pump, the defoaming tank, the pneumatic regulating valve and the electromagnetic flow meter are sequentially connected through the pipeline and used as a fluid channel, and the pipeline between the fluid storage container and the water pump, the pipeline between the water pump and the defoaming tank and the pipeline between the defoaming tank and the pneumatic regulating valve are respectively provided with a stop valve,
the liquid level meter is positioned in the fluid storage container and used for acquiring liquid level data of fluid in the fluid storage container in real time, and the liquid level meter is connected with the water pump optimization controller and sends the liquid level data to the water pump optimization controller;
the water pump optimization regulator is connected with the water pump, and controls the rotating speed of the water pump in real time according to the power supply frequency, the liquid level data and preset flow detection points so as to rectify the flow;
the first pressure gauge is arranged on a pipeline between the defoaming tank and the pneumatic regulating valve, the second pressure gauge is arranged on a pipeline between the pneumatic regulating valve and the electromagnetic flowmeter, the third pressure gauge is arranged on a pipeline connected with the output end of the electromagnetic flowmeter, and the pressure gauges are used for collecting pipeline pressure data of the pipeline in which the pressure gauges are arranged in real time; the first pressure gauge, the second pressure gauge and the third pressure gauge are all connected to the pneumatic regulating valve optimized regulator and transmit pressure data of all pipelines to the pneumatic regulating valve optimized regulator;
the electromagnetic flow meter is connected with the pneumatic regulating valve optimization regulator and is used for detecting the flow of the passing fluid in real time and sending the flow to the pneumatic regulating valve optimization regulator;
the pneumatic control valve optimizing regulator is connected with the pneumatic control valve and controls the opening of the pneumatic control valve in real time according to the indicating value of the electromagnetic flowmeter, the pressure data of each pipeline and the preset flow detection points so as to carry out rectification.
Preferably, the fluid storage container is provided with a filter screen at the water outlet of the pipeline; a partition plate and a mesh structure with holes are arranged in the defoaming tank, and the fluid in the defoaming tank reaches the liquid level height which enables the connected output pipeline to reach a full pipe flow state;
the device also comprises an industrial personal computer, wherein the electromagnetic flow meter, the first pressure gauge, the second pressure gauge, the third pressure gauge and the liquid level meter are respectively connected with the industrial personal computer and send detected data to the industrial personal computer; the industrial personal computer is connected with and controls the water pump optimization regulator and the pneumatic regulating valve optimization regulator, and respectively obtains the rotating speed of the water pump and the opening of the pneumatic regulating valve from the water pump optimization regulator and the pneumatic regulating valve optimization regulator;
the industrial personal computer is provided with a human-computer interface used for displaying various detection data, the rotating speed of the water pump and the opening degree of the pneumatic regulating valve, and the human-computer interface is also provided with an input window used for inputting various flow detection points and inputting initial power supply frequency;
the initial power supply frequency and each flow detection point are input through an industrial personal computer to be sent to a water pump PID controller, or are pre-stored in the water pump PID controller; each flow detection point is input through an industrial personal computer to be sent to the pneumatic control valve PID controller or is pre-stored in the pneumatic control valve PID controller.
Furthermore, the water pump optimization controller comprises a water pump PID controller, a water pump feedforward regulator and a frequency converter:
the water pump PID controller is connected with the industrial personal computer and the water pump through the frequency converter and is used for generating a power supply frequency control instruction according to the power supply frequency and each flow detection point;
the water pump feedforward regulator is connected with the liquid level meter, the frequency converter and the water pump PID controller and is used for performing feedforward compensation on power supply frequency according to liquid level data detected by the liquid level meter;
the frequency converter is used as an actuator and used for adjusting the power supply frequency according to the power supply frequency control instruction so as to adjust the rotating speed of the water pump.
Furthermore, the pneumatic regulating valve optimizing regulator comprises a pneumatic regulating valve PID controller, a pneumatic regulating valve feedforward regulator, a pneumatic membrane actuator and a positioner:
the pneumatic control valve PID controller is connected with an industrial personal computer and an electromagnetic flowmeter through a positioner, the positioner is used for converting the indication value of the electromagnetic flowmeter into an electric signal, and the pneumatic control valve PID controller is used for generating a pneumatic control valve opening control instruction according to the electric signal corresponding to the indication value of the electromagnetic flowmeter and each flow detection point;
the pneumatic control valve feed-forward regulator is connected with each pressure gauge, the pneumatic film actuator and the pneumatic control valve PID controller, and is used for carrying out feed-forward compensation on the opening of the pneumatic control valve according to pipeline pressure data detected by each pressure gauge;
and the pneumatic film actuator is used for controlling the opening of the pneumatic regulating valve according to the opening control instruction of the pneumatic regulating valve.
The second purpose of the invention is realized by the following technical scheme: an intelligent combined optimization rectification method suitable for a complex flow field is applied to an intelligent combined optimization rectification device suitable for the complex flow field and comprises the following steps:
s1, starting operation of a rectifying device, pumping fluid in a fluid storage container into a pipeline through a water pump for transmission, enabling the fluid to pass through a defoaming tank, removing bubbles of the fluid by the defoaming tank, reducing liquid flow pressure fluctuation, and then sequentially passing through a pneumatic regulating valve and an electromagnetic flowmeter;
s2, acquiring liquid level data of fluid in the fluid storage container in real time through a liquid level meter, and sending the acquired liquid level data to the water pump optimization regulator through the liquid level meter;
detecting the flow of the fluid in real time through an electromagnetic flowmeter, and sending the indication value of the electromagnetic flowmeter to a pneumatic regulating valve optimization regulator;
the method comprises the following steps that pipeline pressure data of a pipeline where the pipeline is located are collected in real time through a first pressure gauge, a second pressure gauge and a third pressure gauge, and the first pressure gauge, the second pressure gauge and the third pressure gauge transmit the pipeline pressure data to a pneumatic control valve optimizing regulator;
and S3, controlling the rotating speed of the water pump in real time through the water pump optimization controller according to the power supply frequency, the liquid level data and the preset flow detection points, and controlling the opening of the pneumatic regulating valve in real time through the pneumatic regulating valve optimization controller according to the indication value of the electromagnetic flowmeter, the pipeline pressure data and the preset flow detection points so as to carry out rectification together.
Preferably, when the rectifying device starts to work, each flow detection point and initial power supply frequency are input through the industrial personal computer; or before starting working, pre-storing each flow detection point and initial power supply frequency in a water pump PID controller of a water pump optimization controller, and pre-storing each flow detection point in a pneumatic regulating valve PID controller of the pneumatic regulating valve optimization controller;
in the whole rectifying process, liquid level data of the fluid storage container, fluid flow data detected by electromagnetic flow, pipeline pressure data of each pipeline, the rotating speed of the water pump and the opening degree of the pneumatic regulating valve are displayed in real time through the industrial personal computer.
Preferably, in step S3, the process of rectifying the water pump optimization regulator is specifically as follows:
the water pump PID controller generates a power supply frequency control instruction according to the power supply frequency and each flow detection point, and sends the power supply frequency control instruction to the frequency converter;
the water pump feedforward regulator acquires liquid level data detected by the liquid level meter and performs feedforward compensation on power supply frequency according to the liquid level data;
the frequency converter executes a power supply frequency control instruction, adjusts the power supply frequency according to the power supply frequency control instruction, and further adjusts the rotating speed of the water pump;
the process of optimizing the regulator rectification of the pneumatic regulating valve is as follows:
the positioner converts the indicating value of the electromagnetic flowmeter into an electric signal and sends the electric signal to the PID controller of the pneumatic regulating valve;
the PID controller of the pneumatic regulating valve generates a pneumatic regulating valve opening control instruction according to an electric signal corresponding to the indicating value of the electromagnetic flowmeter and each flow detection point and sends the pneumatic regulating valve opening control instruction to the pneumatic film actuator;
the method comprises the following steps that a pneumatic control valve feedforward regulator obtains pipeline pressure data detected by a first pressure gauge, a second pressure gauge and a third pressure gauge, and performs feedforward compensation on the opening degree of the pneumatic control valve according to the pipeline pressure data detected by the pressure gauges;
and the pneumatic film actuator executes the opening control instruction of the pneumatic regulating valve and controls the opening of the pneumatic regulating valve according to the opening control instruction of the pneumatic regulating valve.
Further, when the electromagnetic flow meter indication value is greater than the flow detection point:
the PID controller of the water pump controls the reduction of the rotating speed of the water pump through the frequency converter so as to reduce the flow of the water pump, after multiple frequency conversion adjustments, the difference value between the indication value of the electromagnetic flowmeter and the flow detection point reaches a certain precision range, then the PID controller of the pneumatic regulating valve controls the opening of the pneumatic regulating valve through the pneumatic film actuator according to the difference value between the indication value of the electromagnetic flowmeter and the flow detection point, and finally the indication value of the electromagnetic flowmeter is located in an allowable flow detection point fluctuation range through the multiple opening adjustments of the pneumatic regulating valve;
when the indication value of the electromagnetic flowmeter is smaller than the flow detection point:
the water pump PID controller controls the rotation speed of the water pump to increase the flow of the water pump through the frequency converter, after frequency conversion adjustment for multiple times, the difference value between the indication value of the electromagnetic flowmeter and the flow detection point reaches a certain precision range, then the pneumatic regulating valve PID controller controls the opening of the pneumatic regulating valve through the pneumatic film actuator according to the difference value between the indication value of the electromagnetic flowmeter and the flow detection point, and finally the indication value of the electromagnetic flowmeter is located in an allowable flow detection point fluctuation range through the opening adjustment of the pneumatic regulating valve for multiple times.
Furthermore, the functional relation between the power supply frequency f and the water pump rotating speed n is as follows:
wherein S is slip; p is the number of pole pairs of a motor of the water pump;
the functional relation between the water pump rotating speed n and the water pump flow q is as follows:
in the formula, q1And q is2Water pump flow before and after rectification, n1And n2The water pump rotating speeds before and after rectification are respectively.
The third purpose of the invention is realized by the following technical scheme: the application of the intelligent combined optimized rectifying device suitable for the complex flow field, which is provided by the first object of the invention, is applied to a flow verification system used for verifying a flow meter, the input end of the detected flowmeter is connected to an electromagnetic flowmeter of the rectifying device through a pipeline, the output end of the detected flowmeter is respectively connected with the bypass and the weighing container arranged on the scale through the commutator, the output end of the bypass and the output end of the weighing container are respectively connected to the fluid storage container through pipelines, the pipeline between the electromagnetic flowmeter and the detected flowmeter, the pipeline between the bypass and the fluid storage container and the pipeline between the weighing container and the fluid storage container are respectively provided with a stop valve, and the timer is connected with the commutator; the flow verification system regulates and controls the flow passing through the detected flowmeter through the rectifying device, so that the flow is stable and reaches a flow detection point.
Compared with the prior art, the invention has the following advantages and effects:
(1) according to the rectifying device and the rectifying method, the water pump optimization regulator and the pneumatic regulating valve optimization regulator are used for respectively regulating and controlling the flow, and finally, an optimal combined regulation and control scheme about the power supply frequency and the opening of the pneumatic regulating valve is obtained, so that the defect of poor instantaneous flow stability during variable-frequency speed regulation and voltage stabilization of the water pump can be overcome, the regulation and control precision and accuracy are higher, the rectifying effect is better, and the stability requirement of a high-precision measurement system can be met.
(2) In the rectifying device and the rectifying method, the water pump optimization regulator can consider the influence of interference quantity of liquid level data of fluid in the fluid storage container, adjust the power supply frequency under the condition of eliminating the influence through feedforward regulation, and finally obtain more proper power supply frequency through multiple feedback regulation; the pneumatic control valve optimizing regulator can take the influence of interference quantities of pipeline pressure data of each pipeline into consideration, the opening degree of the pneumatic control valve is adjusted under the condition that the influence is eliminated through feedforward regulation, and the opening degree of the pneumatic control valve can be more properly adjusted through multiple feedback regulation. Therefore, the rectifying device and the rectifying method control the flow based on the influence factors of various fluid flows, and are more favorable for improving the regulation and control precision and accuracy of the flow.
(3) The rectifying device is provided with the defoaming tank, so that bubbles of fluid can be removed and outlet liquid flow pressure fluctuation can be reduced through the defoaming tank, the influence of the fluid mixed with the bubbles and the overlarge outlet liquid flow pressure fluctuation on the detection of the flowmeter is avoided, and the flow verification system containing the rectifying device can be suitable for the detection of the flowmeter in a complex flow field.
Drawings
FIG. 1 is a schematic diagram of an intelligent combined optimized fairing of the present invention that accommodates complex flow fields.
Fig. 2 is a control schematic diagram of the water pump optimization regulator.
FIG. 3 is a control schematic of a pneumatic regulator valve optimization regulator.
FIG. 4 is a flow chart of the intelligent combined optimized rectification method for adapting to complex flow fields according to the invention.
Fig. 5 is a schematic diagram of a flow verification system employing the fairing of fig. 1.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited thereto.
Examples
The embodiment discloses an intelligent combined optimized rectifying device adapted to a complex flow field, as shown in fig. 1, including: the device comprises a water pump, a defoaming tank, a water pump optimization regulator, a liquid level meter, a first pressure gauge P1, a second pressure gauge P2, a third pressure gauge P3, an electromagnetic flow meter, a pneumatic regulating valve and a pneumatic regulating valve optimization regulator.
The input of water pump passes through the fluid storage container that the pipe connection storage has fluid, and the output of water pump, bubble removing jar, pneumatic control valve and electromagnetic flowmeter connect gradually and regard as fluid passage through the pipeline, and pipeline between fluid storage container and the water pump, pipeline between water pump and the bubble removing jar and the pipeline between bubble removing jar and the pneumatic control valve all are equipped with the stop valve.
Wherein, the water pump is used for pumping the fluid in the fluid storage container to the pipeline for transmission.
The fluid storage container is provided with a filter screen at a pipeline water outlet thereof to filter impurities.
The defoaming tank can adopt a pressure stabilizing tank, and the liquid level of the fluid in the defoaming tank needs to ensure that the connected output pipeline can reach a full pipe flow state so as to remove bubbles of the fluid, so that the rectifying device can adapt to a complex flow field environment such as a double-phase flow environment. The defoaming tank is also internally provided with a vertically-arranged partition plate and a horizontally-arranged perforated net structure (such as a perforated net sheet), and the partition plate and the perforated net structure can play a certain buffering role in the flow of fluid in the defoaming tank, so that the pressure fluctuation of outlet liquid flow can be reduced.
The electromagnetic flowmeter is used for detecting the passing fluid flow in real time, and the indication value of the electromagnetic flowmeter is detected fluid flow data.
The liquid level meter is positioned in the fluid storage container and used for collecting liquid level data of fluid in the fluid storage container in real time, and the liquid level meter is connected with the water pump optimization controller and sends the liquid level data to the water pump optimization controller.
The water pump optimization controller is connected with the water pump and controls the rotating speed of the water pump in real time according to the power supply frequency, the liquid level data and preset flow detection points so as to rectify the flow.
The first pressure gauge is arranged on a pipeline between the defoaming tank and the pneumatic regulating valve, the second pressure gauge is arranged on a pipeline between the pneumatic regulating valve and the electromagnetic flowmeter, the third pressure gauge is arranged on a pipeline connected with the output end of the electromagnetic flowmeter, and the pressure gauges are used for collecting pipeline pressure data of the pipeline in which the pressure gauges are arranged in real time; first pressure gauge, second pressure gauge and third pressure gauge all are connected to pneumatic control valve and optimize the modulator to optimize the modulator with each pipeline pressure data transmission for pneumatic control valve.
The electromagnetic flowmeter is connected with the pneumatic control valve and optimizes the modulator, and the electromagnetic flowmeter is used for detecting the fluid flow passing through in real time, automatically converts the detection value into a corresponding electric signal, and sends the electric signal to the pneumatic control valve to optimize the modulator, so that the pneumatic control valve optimizes the modulator to control the pneumatic control valve, and the flow is accurately regulated and controlled.
The pneumatic control valve optimizing regulator is connected with the pneumatic control valve and controls the opening of the pneumatic control valve in real time according to the indicating value of the electromagnetic flowmeter, the pressure data of each pipeline and the preset flow detection points so as to carry out rectification.
In the embodiment, the device also comprises an industrial personal computer, wherein the electromagnetic flow meter, the first pressure gauge, the second pressure gauge, the third pressure gauge and the liquid level meter are respectively connected with the industrial personal computer and send detected data to the industrial personal computer; the industrial personal computer is connected with and controls the water pump optimization regulator and the pneumatic regulating valve optimization regulator, and the rotating speed of the water pump and the opening degree of the pneumatic regulating valve are respectively obtained from the water pump optimization regulator and the pneumatic regulating valve optimization regulator.
The industrial personal computer is provided with a human-computer interface, and can display various detection data, the rotating speed of the water pump and the opening degree of the pneumatic regulating valve through the human-computer interface. Therefore, the supervisor can check various data in real time through the human-computer interface to judge whether the data are abnormal or not, and the monitoring is very convenient.
The man-machine interface is also provided with an input window used for inputting each flow detection point and inputting initial power supply frequency, and a supervisor can set each flow detection point and the initial power supply frequency through the input window, so that each flow detection point can be used for sending a water feeding pump PID controller and a pneumatic regulating valve PID controller through the input of an industrial personal computer, and the initial power supply frequency can also be used for sending the water feeding pump PID controller through the input of the industrial personal computer. Of course, the initial power supply frequency may also be stored in the water pump PID controller in advance, and each flow detection point may also be stored in the water pump PID controller and the pneumatic control valve PID controller in advance.
As shown in fig. 2, the water pump optimization controller comprises a water pump PID controller, a water pump feedforward regulator and a frequency converter:
and the water pump PID controller is connected with the industrial personal computer and the water pump through the frequency converter and is used for generating a power supply frequency control instruction according to the power supply frequency and each flow detection point based on a PID algorithm.
The water pump feedforward regulator is connected with the liquid level meter, the frequency converter and the water pump PID controller, and the water pump feedforward regulator is used for performing feedforward compensation on power supply frequency according to liquid level data detected by the liquid level meter.
The frequency converter is used as an actuator and used for adjusting the power supply frequency according to the power supply frequency control instruction so as to adjust the rotating speed of the water pump.
Here, considering that the water pump has a large influence on the flow stability due to the liquid level height change of the fluid storage container and the pressure fluctuation of the outlet of the water pump, a water pump feedforward regulator is provided to perform feedforward compensation on the disturbance variable (the liquid level data of the fluid storage container) so as to counteract the influence of the disturbance variable.
As shown in fig. 3, the pneumatic control valve optimizing regulator comprises a pneumatic control valve PID controller, a pneumatic control valve feed-forward regulator, a pneumatic membrane actuator and a positioner:
the pneumatic control valve PID controller is connected with an industrial personal computer and an electromagnetic flowmeter through a positioner, the positioner is used for converting the indication value of the electromagnetic flowmeter into an electric signal, and the pneumatic control valve PID controller is used for generating a pneumatic control valve opening control instruction according to the electric signal corresponding to the indication value of the electromagnetic flowmeter and each flow detection point based on a PID algorithm;
the pneumatic control valve feed-forward regulator is connected with each pressure gauge, the pneumatic film actuator and the pneumatic control valve PID controller, and is used for carrying out feed-forward compensation on the opening of the pneumatic control valve according to pipeline pressure data detected by each pressure gauge;
and the pneumatic film actuator is used for controlling the opening of the pneumatic regulating valve according to the opening control instruction of the pneumatic regulating valve.
Here, in consideration of the fact that the flow stability is affected by the resistance of the pneumatic control valve itself and the line resistance, a pneumatic control valve feedforward regulator is provided to perform feedforward compensation on disturbance amounts (line pressure data) so as to cancel out the influence of the disturbance amounts.
As shown in fig. 4, this embodiment also discloses an intelligent combined optimized rectification method adapted to a complex flow field, where the rectification method is applicable to the rectification device, and the steps are specifically as follows:
and S1, starting the rectifying device, starting each element, opening each valve, pumping the fluid in the fluid storage container into a pipeline through a water pump for transmission, enabling the fluid to pass through a defoaming tank, removing bubbles of the fluid by the defoaming tank, reducing liquid flow pressure fluctuation, and then sequentially passing through a pneumatic regulating valve and an electromagnetic flowmeter.
When the rectifying device starts to work, all the flow detection points and the initial power supply frequency are input through the industrial personal computer, or all the flow detection points and the initial power supply frequency are stored in a water pump PID controller of the water pump optimization regulator in advance before the rectifying device starts to work, and all the flow detection points are stored in a pneumatic regulating valve PID controller of the pneumatic regulating valve optimization regulator in advance.
S2, acquiring liquid level data of the fluid storage container in real time through a liquid level meter, and sending the acquired liquid level data to the water pump optimization regulator through the liquid level meter;
detecting the flow of the fluid in real time through an electromagnetic flowmeter, and sending the indication value of the electromagnetic flowmeter to a pneumatic regulating valve optimization regulator;
the method comprises the following steps that pipeline pressure data of a pipeline where the pipeline is located are collected in real time through a first pressure gauge, a second pressure gauge and a third pressure gauge, and the first pressure gauge, the second pressure gauge and the third pressure gauge transmit the pipeline pressure data to a pneumatic control valve optimizing regulator;
and S3, controlling the rotating speed of the water pump in real time through the water pump optimization controller according to the power supply frequency, the liquid level data and the preset flow detection points, and controlling the opening of the pneumatic regulating valve in real time through the pneumatic regulating valve optimization controller according to the indication value of the electromagnetic flowmeter, the pipeline pressure data and the preset flow detection points so as to carry out rectification together.
Wherein, (1) the water pump optimizes the process of modulator rectification specifically as follows:
(11) and the water pump PID controller adopts a PID algorithm, generates a power supply frequency control instruction according to the power supply frequency and each flow detection point, and sends the power supply frequency control instruction to the frequency converter.
Specifically, the power supply frequency f and the water pump rotating speed n have the following functional relation:
wherein S is slip; p is the number of pole pairs of a motor of the water pump;
therefore, the water pump PID controller can calculate the corresponding current water pump rotating speed according to the current power supply frequency based on the formula.
The functional relation between the water pump rotating speed n and the water pump flow q is as follows:
in the formula, q1And q is2Water pump flow before and after rectification, n1And n2The water pump rotating speeds before and after rectification are respectively set;
therefore, the water pump PID controller can calculate the corresponding water pump flow rate according to the calculated water pump rotation speed based on the above formula, and then calculate the corresponding target rotation speed according to each flow rate detection point. And calculating a target power supply frequency corresponding to the target rotating speed according to a functional relation between the power supply frequency f and the water pump rotating speed n based on the target rotating speed and the current water pump rotating speed, so as to generate a power supply frequency control instruction for adjusting the current power supply frequency, so that the current power supply frequency can be adjusted to the target power supply frequency, and the water pump reaches the target rotating speed, thereby realizing rectification.
(12) The water pump feedforward regulator obtains liquid level data detected by the liquid level meter, and the liquid level data is used as an interference amount, so that the water pump feedforward regulator performs feedforward compensation on the rotating speed of the water pump and plays a role in counteracting the influence of the interference amount on the final fluid flow.
And the frequency converter executes the power supply frequency control instruction, and adjusts the current power supply frequency according to the power supply frequency control instruction and the liquid level data, so as to adjust the rotating speed of the water pump.
(2) The process of optimizing the regulator rectification of the pneumatic regulating valve is as follows:
(21) the positioner converts the indicating value of the electromagnetic flowmeter into an electric signal and sends the electric signal to the PID controller of the pneumatic regulating valve;
(22) the PID controller of the pneumatic regulating valve adopts a PID algorithm, calculates the opening of the pneumatic regulating valve according to the electric signal corresponding to the indicating value of the electromagnetic flowmeter and each flow detection point, generates a pneumatic regulating valve opening control instruction for regulating the opening of the pneumatic regulating valve, and sends the pneumatic regulating valve opening control instruction to the pneumatic film actuator;
(23) the method comprises the following steps that a pneumatic control valve feedforward regulator obtains pipeline pressure data detected by a first pressure gauge, a second pressure gauge and a third pressure gauge, and performs feedforward compensation on the opening degree of the pneumatic control valve according to the pipeline pressure data detected by the pressure gauges;
and the pneumatic film actuator executes the opening control instruction of the pneumatic regulating valve and controls the opening of the pneumatic regulating valve according to the opening control instruction of the pneumatic regulating valve.
When the indication value of the electromagnetic flowmeter is greater than the flow detection point:
the PID controller of the water pump controls the reduction of the rotating speed of the water pump through the frequency converter so as to reduce the flow of the water pump, after multiple frequency conversion adjustments, the difference value between the indication value of the electromagnetic flowmeter and the flow detection point reaches a certain precision range, then the PID controller of the pneumatic regulating valve controls the opening of the pneumatic regulating valve through the pneumatic film actuator according to the difference value between the indication value of the electromagnetic flowmeter and the flow detection point, and finally the indication value of the electromagnetic flowmeter is located in an allowable flow detection point fluctuation range through the multiple opening adjustments of the pneumatic regulating valve;
when the electromagnetic flow meter indication value of the electromagnetic flow meter is smaller than the flow detection point:
the water pump PID controller controls the rotation speed of the water pump to increase the flow of the water pump through the frequency converter, after frequency conversion adjustment for multiple times, the difference value between the indication value of the electromagnetic flowmeter and the flow detection point is detected to reach a certain precision range, then the pneumatic regulating valve PID controller controls the opening of the pneumatic regulating valve through the pneumatic film actuator according to the difference value between the indication value of the electromagnetic flowmeter and the flow detection point, and finally the indication value of the electromagnetic flowmeter is located in an allowable flow detection point fluctuation range through the opening adjustment of the pneumatic regulating valve for multiple times.
Therefore, the frequency converter executes the power supply frequency control instruction under the condition that the influence of the interference quantity (liquid level data of the fluid storage container) is considered, and can finally obtain more proper power supply frequency after multiple times of adjustment; the pneumatic control valve PID controller takes an electromagnetic flowmeter indicating value as real-time data, each flow detection point as reference, the opening of the pneumatic control valve is determined according to the difference value of the two, and the pneumatic membrane actuator executes a pneumatic control valve opening control instruction under the condition that the influence of interference quantity (pipeline pressure data of each pipeline) is considered, so that the opening of the pneumatic control valve can be more properly adjusted through multiple times of adjustment. According to the method, the optimal combined regulation and control scheme can be finally obtained by optimizing and controlling the flow for multiple times, and the purpose of improving the flow regulation and control precision and accuracy is achieved.
In the whole rectifying process, the liquid level data of the fluid storage container, the indicating value of the electromagnetic flowmeter, the pipeline pressure data of each pipeline, the rotating speed of the water pump and the opening degree of the pneumatic regulating valve can be displayed in real time through the industrial personal computer, so that a supervisor can monitor the work of the rectifying system in real time through the industrial personal computer.
The rectifying device can be applied to a flow verification system, the flow verification system comprises a commutator, a bypass, a weighing container, a scale and a timer besides the rectifying device, as shown in fig. 5, the input end of a detected flowmeter is connected to an electromagnetic flowmeter of the rectifying device through a pipeline, the output end of the detected flowmeter is respectively connected with the bypass and the weighing container arranged on the scale through the commutator, the output end of the bypass and the output end of the weighing container are respectively connected to a fluid storage container through pipelines, and the pipelines between the electromagnetic flowmeter and the detected flowmeter, the pipeline between the bypass and the fluid storage container and the pipeline between the weighing container and the fluid storage container are respectively provided with a stop valve.
An electromagnetic flowmeter was used as a standard flow meter. The timer is connected with the diverter and is used for recording the starting time of starting the diverter to enable the fluid to be changed into the weighing container, namely the detection starting time, and recording the stopping time of the fluid to be changed into the bypass after the preset time is reached, namely the detection ending time. Here, the weighing start time and the stop time of the flow meter under test are respectively matched with the detection start time and the stop time of the timer.
The flow verification system is used for verifying the flowmeter, and the flow passing through the detected flowmeter is regulated and controlled by the rectifying device in the verification process, so that the flow is stable and reaches a flow detection point. The flow detection points are generally: q. q.smax,0.5qmax,0.2qmax,qmin，qmaxIs the upper measurement limit of the detected flowmeter; q. q.sminIs the lower measurement limit of the flow meter to be tested.
The timer is connected to the industrial personal computer and controlled by the industrial personal computer, and an input window for inputting the time length of the timer is correspondingly arranged on a human-computer interface of the industrial personal computer, so that the time length of the timer can be preset through the industrial personal computer. The scale is also connected to the industrial personal computer, and the recorded fluid quality is sent to the industrial personal computer for display.
The calibration system is a flow calibration system by a weighing method, and the calibration principle is as follows:
firstly, the system starts to work and is in a normal working state, then the power supply frequency and the opening degree of a pneumatic regulating valve are regulated through a rectifying device, and the flow of the fluid is regulated to the verification flow;
guiding the fluid to a bypass device by using a commutator, and operating for 10min under the maximum flow;
detecting whether the device leaks, the temperature and pressure of the fluid should be stable, and whether each instrument is normal;
under the normal condition of detection, firstly closing a stop valve between the weighing container and the fluid storage container, and then weighing the initial mass of the weighing container;
starting a commutator to enable fluid to be changed into a weighing container, enabling a timer to start timing and a detected flowmeter to start recording the flow of the passing fluid, adjusting the power supply frequency and the opening of a pneumatic adjusting valve by a rectifying device in the process, finishing the regulation and control of the flow of the fluid, when the timer reaches preset time, changing the fluid into a bypass through the commutator, and stopping timing by the timer;
weighing the final mass of the weighing container, and finally calculating the mass flow q of the fluid flowing through the detected flowmeter according to the initial mass and the final mass of the weighing container and the time length recorded by the timertThe unit is kg/s. The formula is as follows:
qt＝(m2-m1)/t
wherein t is the set time of the timer, and the unit is s; (m)2-m1) The cumulative fluid mass over a set time is in kg.
According to the above steps, with qmax,0.5qmax,0.2qmax,qminThe flow rate of the detected flowmeter is detected in sequence by the detection sequence, and each flow point is detected at least 3 times, so that the detection of the detected flowmeter is completed. And comparing the calculated actual mass flow with the flow value displayed by the detected flowmeter, calculating the basic error and the repeatability of the detected flowmeter, and taking the maximum value of the basic error and the repeatability in each flow detection point to judge whether the requirements of relevant regulations are met.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (10)
1. An intelligent combined optimized rectifying device adapting to a complex flow field is characterized by comprising: the device comprises a water pump, a defoaming tank, a water pump optimization regulator, a liquid level meter, a first pressure meter, a second pressure meter, a third pressure meter, an electromagnetic flow meter, a pneumatic regulating valve and a pneumatic regulating valve optimization regulator, wherein the input end of the water pump is connected with a fluid storage container storing fluid through a pipeline, the output end of the water pump, the defoaming tank, the pneumatic regulating valve and the electromagnetic flow meter are sequentially connected through the pipeline and used as a fluid channel, and the pipeline between the fluid storage container and the water pump, the pipeline between the water pump and the defoaming tank and the pipeline between the defoaming tank and the pneumatic regulating valve are respectively provided with a stop valve,
the liquid level meter is positioned in the fluid storage container and used for acquiring liquid level data of fluid in the fluid storage container in real time, and the liquid level meter is connected with the water pump optimization controller and sends the liquid level data to the water pump optimization controller;
the water pump optimization regulator is connected with the water pump, and controls the rotating speed of the water pump in real time according to the power supply frequency, the liquid level data and preset flow detection points so as to rectify the flow;
the first pressure gauge is arranged on a pipeline between the defoaming tank and the pneumatic regulating valve, the second pressure gauge is arranged on a pipeline between the pneumatic regulating valve and the electromagnetic flowmeter, the third pressure gauge is arranged on a pipeline connected with the output end of the electromagnetic flowmeter, and the pressure gauges are used for collecting pipeline pressure data of the pipeline in which the pressure gauges are arranged in real time; the first pressure gauge, the second pressure gauge and the third pressure gauge are all connected to the pneumatic regulating valve optimized regulator and transmit pressure data of all pipelines to the pneumatic regulating valve optimized regulator;
the electromagnetic flow meter is connected with the pneumatic regulating valve optimization regulator and is used for detecting the flow of the passing fluid in real time and sending the flow to the pneumatic regulating valve optimization regulator;
the pneumatic control valve optimizing regulator is connected with the pneumatic control valve and controls the opening of the pneumatic control valve in real time according to the indicating value of the electromagnetic flowmeter, the pressure data of each pipeline and the preset flow detection points so as to carry out rectification.
2. The intelligent combined optimized rectifying device adapting to the complex flow field according to claim 1, wherein a filter screen is arranged at a pipeline water outlet of a fluid storage container; a partition plate and a mesh structure with holes are arranged in the defoaming tank, and the fluid in the defoaming tank reaches the liquid level height which enables the connected output pipeline to reach a full pipe flow state;
the device also comprises an industrial personal computer, wherein the electromagnetic flow meter, the first pressure gauge, the second pressure gauge, the third pressure gauge and the liquid level meter are respectively connected with the industrial personal computer and send detected data to the industrial personal computer; the industrial personal computer is connected with and controls the water pump optimization regulator and the pneumatic regulating valve optimization regulator, and respectively obtains the rotating speed of the water pump and the opening of the pneumatic regulating valve from the water pump optimization regulator and the pneumatic regulating valve optimization regulator;
the industrial personal computer is provided with a human-computer interface used for displaying various detection data, the rotating speed of the water pump and the opening degree of the pneumatic regulating valve, and the human-computer interface is also provided with an input window used for inputting various flow detection points and inputting initial power supply frequency;
the initial power supply frequency and each flow detection point are input through an industrial personal computer to be sent to a water pump PID controller, or are pre-stored in the water pump PID controller; each flow detection point is input through an industrial personal computer to be sent to the pneumatic control valve PID controller or is pre-stored in the pneumatic control valve PID controller.
3. The intelligent combined optimized rectifying device adapting to the complex flow field according to claim 2, wherein the water pump optimized regulator comprises a water pump PID controller, a water pump feedforward regulator and a frequency converter:
the water pump PID controller is connected with the industrial personal computer and the water pump through the frequency converter and is used for generating a power supply frequency control instruction according to the power supply frequency and each flow detection point;
the water pump feedforward regulator is connected with the liquid level meter, the frequency converter and the water pump PID controller and is used for performing feedforward compensation on power supply frequency according to liquid level data detected by the liquid level meter;
the frequency converter is used as an actuator and used for adjusting the power supply frequency according to the power supply frequency control instruction so as to adjust the rotating speed of the water pump.
4. The intelligent combined optimized fairing device for accommodating complex flow fields as recited in claim 2, wherein said pneumatic regulator valve optimization regulator comprises a pneumatic regulator valve PID controller, a pneumatic regulator valve feed forward regulator, a pneumatic membrane actuator and a positioner:
the pneumatic control valve PID controller is connected with an industrial personal computer and an electromagnetic flowmeter through a positioner, the positioner is used for converting the indication value of the electromagnetic flowmeter into an electric signal, and the pneumatic control valve PID controller is used for generating a pneumatic control valve opening control instruction according to the electric signal corresponding to the indication value of the electromagnetic flowmeter and each flow detection point;
the pneumatic control valve feed-forward regulator is connected with each pressure gauge, the pneumatic film actuator and the pneumatic control valve PID controller, and is used for carrying out feed-forward compensation on the opening of the pneumatic control valve according to pipeline pressure data detected by each pressure gauge;
and the pneumatic film actuator is used for controlling the opening of the pneumatic regulating valve according to the opening control instruction of the pneumatic regulating valve.
5. An intelligent combined optimization rectification method suitable for a complex flow field is applied to the intelligent combined optimization rectification device suitable for the complex flow field in any one of claims 1 to 4, and comprises the following steps:
s1, starting operation of a rectifying device, pumping fluid in a fluid storage container into a pipeline through a water pump for transmission, enabling the fluid to pass through a defoaming tank, removing bubbles of the fluid by the defoaming tank, reducing liquid flow pressure fluctuation, and then sequentially passing through a pneumatic regulating valve and an electromagnetic flowmeter;
s2, acquiring liquid level data of fluid in the fluid storage container in real time through a liquid level meter, and sending the acquired liquid level data to the water pump optimization regulator through the liquid level meter;
detecting the flow of the fluid in real time through an electromagnetic flowmeter, and sending the indication value of the electromagnetic flowmeter to a pneumatic regulating valve optimization regulator;
the method comprises the following steps that pipeline pressure data of a pipeline where the pipeline is located are collected in real time through a first pressure gauge, a second pressure gauge and a third pressure gauge, and the first pressure gauge, the second pressure gauge and the third pressure gauge transmit the pipeline pressure data to a pneumatic control valve optimizing regulator;
and S3, controlling the rotating speed of the water pump in real time through the water pump optimization controller according to the power supply frequency, the liquid level data and the preset flow detection points, and controlling the opening of the pneumatic regulating valve in real time through the pneumatic regulating valve optimization controller according to the indication value of the electromagnetic flowmeter, the pipeline pressure data and the preset flow detection points so as to carry out rectification together.
6. The intelligent combined optimization rectification method suitable for the complex flow field according to claim 5, wherein when the rectification device starts to work, each flow detection point and initial power supply frequency are input through an industrial personal computer; or before starting working, pre-storing each flow detection point and initial power supply frequency in a water pump PID controller of a water pump optimization controller, and pre-storing each flow detection point in a pneumatic regulating valve PID controller of the pneumatic regulating valve optimization controller;
in the whole rectifying process, liquid level data of the fluid storage container, fluid flow data detected by electromagnetic flow, pipeline pressure data of each pipeline, the rotating speed of the water pump and the opening degree of the pneumatic regulating valve are displayed in real time through the industrial personal computer.
7. The intelligent combined optimization rectification method suitable for the complex flow field according to claim 5, wherein in step S3, the rectification process of the water pump optimization regulator is as follows:
the water pump PID controller generates a power supply frequency control instruction according to the power supply frequency and each flow detection point, and sends the power supply frequency control instruction to the frequency converter;
the water pump feedforward regulator acquires liquid level data detected by the liquid level meter and performs feedforward compensation on power supply frequency according to the liquid level data;
the frequency converter executes a power supply frequency control instruction, adjusts the power supply frequency according to the power supply frequency control instruction, and further adjusts the rotating speed of the water pump;
the process of optimizing the regulator rectification of the pneumatic regulating valve is as follows:
the positioner converts the indicating value of the electromagnetic flowmeter into an electric signal and sends the electric signal to the PID controller of the pneumatic regulating valve;
the PID controller of the pneumatic regulating valve generates a pneumatic regulating valve opening control instruction according to an electric signal corresponding to the indicating value of the electromagnetic flowmeter and each flow detection point and sends the pneumatic regulating valve opening control instruction to the pneumatic film actuator;
the method comprises the following steps that a pneumatic control valve feedforward regulator obtains pipeline pressure data detected by a first pressure gauge, a second pressure gauge and a third pressure gauge, and performs feedforward compensation on the opening degree of the pneumatic control valve according to the pipeline pressure data detected by the pressure gauges;
and the pneumatic film actuator executes the opening control instruction of the pneumatic regulating valve and controls the opening of the pneumatic regulating valve according to the opening control instruction of the pneumatic regulating valve.
8. The intelligent combined optimized rectification method suitable for the complex flow field according to claim 7, characterized in that when the indication value of the electromagnetic flowmeter is larger than the flow detection point:
the PID controller of the water pump controls the reduction of the rotating speed of the water pump through the frequency converter so as to reduce the flow of the water pump, after multiple frequency conversion adjustments, the difference value between the indication value of the electromagnetic flowmeter and the flow detection point reaches a certain precision range, then the PID controller of the pneumatic regulating valve controls the opening of the pneumatic regulating valve through the pneumatic film actuator according to the difference value between the indication value of the electromagnetic flowmeter and the flow detection point, and finally the indication value of the electromagnetic flowmeter is located in an allowable flow detection point fluctuation range through the multiple opening adjustments of the pneumatic regulating valve;
when the indication value of the electromagnetic flowmeter is smaller than the flow detection point:
the water pump PID controller controls the rotation speed of the water pump to increase the flow of the water pump through the frequency converter, after frequency conversion adjustment for multiple times, the difference value between the indication value of the electromagnetic flowmeter and the flow detection point reaches a certain precision range, then the pneumatic regulating valve PID controller controls the opening of the pneumatic regulating valve through the pneumatic film actuator according to the difference value between the indication value of the electromagnetic flowmeter and the flow detection point, and finally the indication value of the electromagnetic flowmeter is located in an allowable flow detection point fluctuation range through the opening adjustment of the pneumatic regulating valve for multiple times.
9. The intelligent combined optimization rectification method suitable for the complex flow field according to claim 8, wherein the functional relation between the power supply frequency f and the water pump rotating speed n is as follows:
wherein S is slip; p is the number of pole pairs of a motor of the water pump;
the functional relation between the water pump rotating speed n and the water pump flow q is as follows:
in the formula, q1And q is2Water pump flow before and after rectification, n1And n2The water pump rotating speeds before and after rectification are respectively.
10. An application of the intelligent combined optimized rectifying device suitable for the complex flow field is characterized in that the intelligent combined optimized rectifying device suitable for the complex flow field as claimed in any one of claims 1 to 4 is applied to a flow verification system, the flow verification system is used for verifying a flow meter, the intelligent combined optimized rectifying device further comprises a commutator, a bypass, a weighing container, a scale and a timer, the input end of the detected flow meter is connected to an electromagnetic flow meter of the rectifying device through a pipeline, the output end of the detected flow meter is respectively connected with the bypass and the weighing container arranged on the scale through the commutator, the output end of the bypass and the output end of the weighing container are respectively connected to a fluid storage container through pipelines, and the pipeline between the electromagnetic flow meter and the detected flow meter, the pipeline between the bypass and the fluid storage container and the pipeline between the weighing container and the fluid storage container are respectively provided with a stop valve, the timer is connected with the commutator; the flow verification system regulates and controls the flow passing through the detected flowmeter through the rectifying device, so that the flow is stable and reaches a flow detection point.
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