CN116292221B - Compressed gas control system comprising multiple air compressors and control method thereof - Google Patents

Compressed gas control system comprising multiple air compressors and control method thereof Download PDF

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Publication number
CN116292221B
CN116292221B CN202310089506.3A CN202310089506A CN116292221B CN 116292221 B CN116292221 B CN 116292221B CN 202310089506 A CN202310089506 A CN 202310089506A CN 116292221 B CN116292221 B CN 116292221B
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air compressor
air
compressors
air compressors
state
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CN116292221A (en
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涂勇
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China Yangtze Power Co Ltd
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China Yangtze Power Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/007—Installations or systems with two or more pumps or pump cylinders, wherein the flow-path through the stages can be changed, e.g. from series to parallel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B37/00—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00
    • F04B37/10—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use
    • F04B37/12—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use to obtain high pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B41/00—Pumping installations or systems specially adapted for elastic fluids
    • F04B41/06—Combinations of two or more pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/06—Control using electricity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B51/00—Testing machines, pumps, or pumping installations
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
    • Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Positive-Displacement Pumps (AREA)

Abstract

A compressed gas control system comprising a plurality of air compressors and a control method thereof are provided, wherein the system comprises a pressurizing device, a sensor, a general control function module and a man-machine interaction device. The pressing equipment comprises n air compressors, the numbers of the n air compressors are 1# and 2# … … n #, the pressing equipment is connected with a general control function module, and the general control function module controls the starting/stopping of the pressing equipment; the universal control functional module is used for automatically controlling n air compressors in the pressurizing equipment and is connected with the man-machine interaction device. The invention can be flexibly expanded, when the control system technology is modified, the number of the main air compressor unit, each stage of standby air compressor unit and the total air compressor station air compressor can be flexibly changed, the compressed air system for writing the control program does not need to be changed or redesigned on a large scale, and only the control parameters need to be modified through a man-machine interaction device; greatly saves manpower, material resources and financial resources.

Description

Compressed gas control system comprising multiple air compressors and control method thereof
Technical Field
The invention relates to the technical field of compressed gas control systems, in particular to a compressed gas control system comprising a plurality of air compressors and a control method thereof.
Background
In industrial control, a compressed gas system is needed in many application occasions, such as a large-shaft air supplementing system, a busbar micro-positive pressure system, a speed regulator pressure air tank air supplementing system, a wind brake mechanical braking system and the like of a hydroelectric generating set, and a medium-low pressure air system is needed. These systems are all typical compressed gas systems. The compressed gas system is generally designed with a plurality of air compressors as gas pressurizing equipment, when the technology of the air compressor station of the compressed gas system is modified, the number of the main air compressor unit, each stage of standby air compressor unit and the number of the air compressors of the full air compressor station are changed, and a control program must be rewritten or changed in a large scale, so that a great deal of manpower, material resources and financial resources are consumed for modifying the technology modification program. The present invention discloses a portable, universal, modularized, flexible and extensible compressed air control system and a control method thereof, which can change the number of air compressors of a main air compressor unit, each stage of standby air compressor unit and a full air compressor station and start control parameters, but does not need to change or redesign a large scale of written control programs.
Disclosure of Invention
In order to solve the technical problems, the invention provides a compressed air control system with uniform shutdown pressure and a control method thereof, wherein the control method is a portable, universal and modularized air compressor control method. The invention can be flexibly expanded, when the control system technology is modified, the number of the main air compressor unit, each stage of standby air compressor unit and the total air compressor station air compressor can be flexibly changed, the compressed air system for writing the control program does not need to be changed or redesigned on a large scale, and only the control parameters need to be modified through a man-machine interaction device; greatly saves manpower, material resources and financial resources.
The technical scheme adopted by the invention is as follows:
a compressed gas control system comprising a plurality of air compressors comprises a pressurizing device, a sensor, a general control function module and a man-machine interaction device.
The pressurizing equipment is used for pressurizing the pressureless gas in the pressureless container to the pressure container;
the pressing equipment comprises n air compressors, wherein the numbers of the n air compressors are 1# and 2# … … n #, the pressing equipment is connected with a general control function module, and the general control function module controls the starting/stopping of the pressing equipment; the n air compressors are divided into m+1 groups from high to low according to the priority of the air compressors, wherein the m groups are respectively a 0-level main air compressor unit, a 1-level standby air compressor unit and a … … m-level standby air compressor unit, and m is a natural number.
The plurality of sensors are respectively arranged on the pressure container, the pressureless container and the pressurizing equipment and are used for collecting the pressure of the pressure container, the running state of the air compressor of the pressurizing equipment, the fault state of the air compressor, the manual and automatic state of the air compressor and the running times of the air compressor, and the running time of the air compressor;
the universal control functional module is used for automatically controlling n air compressors in the pressurizing equipment and is connected with the man-machine interaction device.
The pressure vessel is connected with the pressurizing equipment through a first pipeline, and the pressurizing equipment is connected with the pressureless vessel through a second pipeline.
The sensors are connected with the universal control functional module through an electric loop, and are used for collecting pressure of the pressure container, pressure of the pipeline system, operation state of the air compressor of the pressurizing equipment, failure state of the air compressor, manual and automatic state of the air compressor and operation times of the air compressor, and the operation time of the air compressor is transmitted to the universal control functional module through the electric loop.
The general control function module is connected with the man-machine interaction device through a communication loop and receives control parameters of the compressed air system set by the man-machine interaction device: start-stop parameters, air compressor station parameters, rotation parameters, and according to compressed gas system status signals collected by sensors received through an electrical loop: pressure vessel pressure P', line system pressure P, and all air compressors multiple operating mode factor status signals: the method comprises the steps of logically processing the operation state of an air compressor of the pressurizing equipment, the fault state of the air compressor, the manual and automatic state of the air compressor and the operation times of the air compressor, automatically controlling n air compressors in the pressurizing equipment through an electric loop after logically processing the operation time of the air compressor by adopting a compressed air control method comprising a plurality of air compressors, and simultaneously transmitting state parameter information of a compressed air system to a human-computer interaction device through a communication loop.
The start-stop parameters include: starting pressure P of 0-level main air compressor unit 0 Starting pressure P of 1-level air compressor unit 1 Stopping pressure P of 1-level air compressor unit 1 ' … … m-level air compressor set starting pressure P m Equal (m is a natural number), and stopping pressure P of 0-level main air compressor unit 0 ' 1-stage air compressor unit stop pressure P 1 ' 1-stage air compressor unit stop pressure P 1 ' … … m-level air compressor set stop pressure P m ' etc. (m is a natural number). Wherein P is 0 ’>P 0 >P 1 >P 2 >……>P m . P due to uniform shutdown pressure 0 ’=P 1 ’==……=P m ’。
The air compressor station parameters include: total number of air compressors N of compressed air system and number of air compressors N of main air compressor unit 0 Air compressor number N of 1-level standby air compressor unit 1 … … m-level air compressor unit equipped air compressor number N m 。
The rotation parameters include: a fault state weight value a of the air compressor; the manual and automatic state weight value b of the air compressor; a weight value c of the running times of the air compressor; a weight value d of the running time of the air compressor; and the running state weight value e of the air compressor.
And the man-machine interaction device is communicated with the general control function module. And setting control parameters of a compressed gas system by a user through a man-machine interaction device: the start-stop parameter, the air compressor station parameter and the rotation parameter are transmitted to the general control function module, and meanwhile, the man-machine interaction device collects the compressed gas system state parameter information transmitted by the general control function module and performs graphical display.
The compressed gas system state parameter information comprises a rotation sequence, pressure vessel pressure, pipeline system pressure, an air compressor operation state of pressurizing equipment, an air compressor fault state, an air compressor manual automatic state, operation times of the air compressor and operation time of the air compressor.
And the electric loop is connected with the sensor and the general control function module, and the pressing equipment and the general control function module realize the transmission of state signals and control signals.
And the communication loop is connected with the general control function module and the man-machine interaction device to realize the transmission of control parameters and state information of the compressed gas system.
The functions of the general control function module comprise a starting air compressor quantity calculation module, a rotation sequencing module and a starting and stopping air compressor control module;
the number calculation module of the air compressors is started, and according to control parameters of the compressed air system: start-stop parameters, air compressor station parameters, and compressed gas system status signals: the pressure vessel pressure P', the pipeline system pressure P and the like, and the quantity x of the air compressors is output to the air compressor starting and stopping control module by adopting a method for calculating the quantity of the air compressors.
The rotation sequencing module is used for controlling parameters according to the compressed gas system: rotation parameters and state signals of various working condition factors of all air compressors of the compressed air system: the method comprises the steps of adopting a priority wheel change sequencing method to output a rotation sequence to a start-stop air compressor control module, wherein the operation state of an air compressor of a pressing device, the fault state of the air compressor, the manual and automatic state of the air compressor, the operation times of the air compressor, the operation time of the air compressor and the like. The rotation sequence is an air compressor number sequence array, and the rotation sequence is sequentially arranged according to the order of the priority of the air compressors corresponding to the air compressor numbers from high to low.
The starting and stopping air compressor control module is used for receiving the information such as the starting air compressor number x output by the starting air compressor number calculation module, the rotation sequence output by the rotation sequencing module and the like, and outputting an air compressor starting and stopping control signal to the pressurizing equipment by adopting a starting and stopping air compressor control method according to the state signals of various working condition factors of all air compressors of the compressed air system.
A control method of a compressed gas control system, comprising: the method comprises a method for calculating the number of the air compressors, a method for sequencing priority wheel change and a method for controlling the air compressors to be started and stopped;
step 1, acquiring parameters P, P by a number calculation module for starting air compressors 0 、P 0 ’、P 1 …… P m 、 N、 N 0 、N 1 ……N m And (5) entering a step 2. In step 1: starting pressure P of 0-level main air compressor unit 0 Starting pressure P of 1-level air compressor unit 1 … … m-level air compressor set starting pressure P m M is a natural number; the stop pressure of the main air compressor unit and the air compressor units at all levels is the same as P 0 '. Wherein P is 0 ’>P 0 >P 1 >P 2 >……>P m 。
Step 2, detecting whether P is detected by a quantity calculating module of starting air compressors<P 0 If yes, x=n 0 Step 3, entering a step; if not, enter step 3.
Step 3, detecting whether P is detected by a quantity calculating module of starting air compressors<P 1 If yes, x=n 0 + N 1 Step 4, entering a step; if not, enter step 4.
……
Step m+2, starting an air compressor quantity calculating module to detect whether P is detected or not<P m If yes, x=n 0 + N 1 +…… + N m Step m+3; if not, entering the m+3 step.
Step m+3, starting an air compressor quantity calculating module to detect whether P is detected or not>P 0 ' if yes, x=0, go to the m+4 step; if not, directly entering the (m+4) th step.
And step m+4, starting the air compressor quantity calculation module to output x, and returning to the step 1.
The method for calculating the number of the air compressors comprises m+4 steps in total.
When m=0, namely, the control system only has a main air compressor unit and 1 to m stages of standby air compressor units are not provided, the method for calculating the number of the air compressors comprises 4 steps in total, wherein the m+2 step is the 2 nd step, the m+3 step is the 3 rd step, and the m+4 step is the 4 th step;
when m=1, namely, the control system only has a main air compressor unit and 1-level standby air compressor units and no 2-m-level standby air compressor units, the method for calculating the quantity of the air compressors comprises 4 steps in total, wherein the m+2 step is the 3 rd step, the m+3 step is the 4 th step, and the m+4 step is the 5 th step;
when m=2, namely, the control system only has a main air compressor unit, a 1-level standby air compressor unit and a 2-level standby air compressor unit, and no 3-m-level standby air compressor unit, the method for calculating the number of the air compressors comprises 4 steps in total, wherein the m+2th step is the 4 th step, the m+3th step is the 5 th step, and the m+4th step is the 6 th step;
and so on.
The line pressure P in the above-described method steps can also be replaced by the pressure vessel pressure P'.
The priority level round-robin sequencing method comprises the following steps:
step 1: the rotation sequencing module acquires the total number N of air compressors of the compressed air system;
step 2: the rotation sequencing module collects various working condition factor state signals of all the air compressors, and calculates and determines various working condition values of all the air compressors;
step 3: the rotation sequencing module acquires weight values of various working condition factors of all air compressors;
step 4: the rotation sequencing module calculates the priority score of each air compressor according to the working condition values corresponding to various working condition factors of all the air compressors and the corresponding weight values;
step 5: the rotation sequencing module ranks all the air compressors in the system according to the priority score of each air compressor, and obtains a corresponding air compressor number sequence array from high to low according to the priority of the air compressors;
step 6: the rotation sequencing module outputs an air compressor number sequence array;
step 7: and (3) detecting the running states of all the air compressors by the rotation sequencing module, and returning to the step (2) if the air compressors stop running.
In the step 2, the multiple working condition factors include: the operation state of the air compressor, the fault state of the air compressor, the manual and automatic state of the air compressor, the operation times of the air compressor and the operation time of the air compressor. The steps of the invention take the five working condition factors as examples, and the working condition factors can be expanded according to the actual application conditions during actual application.
According to various working condition factors, various working condition values of all air compressors are determined as follows:
in all the air compressors, if the air compressors are in an operation state, the value of the working condition value V is 1; if the air compressor is in a non-running state, the working condition value V takes a value of 0. Let the working condition value of n-number air compressor be V n . Where N.gtoreq.n.gtoreq.1.
In all the air compressors, if the air compressors are in a non-fault state, the value of the working condition value X is 1; if the air compressor cannot work normally, the working condition value X takes a value of 0. Let the working condition value of n-number air compressor be X n . Where N.gtoreq.n.gtoreq.1.
In all the air compressors, if the manual and automatic state of the air compressors is 'automatic', the state working condition value Y takes a value of 1; if the manual and automatic state of the air compressor is manual, the working condition value Y in the state takes a value of 0. The reason for this is that the manual state of the air compressor is set to "automatic" higher priority than to "manual". Let the working condition value of n-number air compressor be Y n . Where N.gtoreq.n.gtoreq.1.
In all the air compressors, the number of the rising edges of the running states of the air compressors can be counted according to the running states of the air compressors to obtain the running times of the air compressors, the running times of the air compressors are ordered, and the working condition value Z of the times of the air compressors corresponding to the times from high to low sequentially takes values of 1,2 … N … N-1 and N. Where N.gtoreq.n.gtoreq.1.Let the frequency operating mode value of n-number air compressor be Z n 。
In all the air compressors, the running time of the air compressors can be obtained by timing the accumulated duration time of the running state of the air compressors according to the running state of the air compressors, the running time of the air compressors is ordered, and the time is sequentially 1,2 … N … N-1 and N from the time of the corresponding air compressor to the time of the corresponding air compressor. Where N.gtoreq.n.gtoreq.1. Let the number of times operating mode value of n number air compressor machine be U n 。
In the step 3, a fault state weight value a of the air compressor is acquired and set; the manual and automatic state weight value b of the air compressor; a weight value c of the running times of the air compressor; a weight value d of the running time of the air compressor; and e, an operation state weight value e of the air compressor.
The user sets the weight values corresponding to various working condition factors according to the self requirements, and generally, the more important the working condition factors are, the larger the influence is, and the larger the weight is. Normally, in order to ensure normal functions, the necessary working condition factors include the running state of the air compressor, the fault state of the air compressor and the manual and automatic state of the air compressor, and e is more than a and less than b. If the start and stop are controlled only according to the operation times of the air compressor, e > a > b > c > d=0; if the start and stop are controlled only according to the operation time of the air compressor, e > a > b > d > c=0; if the start and stop are controlled according to the operation times and the operation time of the air compressor and preferentially according to the operation times of the air compressor, e > a > b > c > d >0; if the start and stop are controlled according to the operation times and the operation time of the air compressor at the same time, e > a > b > d > c >0.
In the step 4, the priority score m=ax+by+cz+du+ev of each air compressor is calculated respectively; priority score M of n-number air compressor n =aX n +bY n +cZ n +dU n +eV n 。
In the step 5, the priority of the air compressors is ordered according to the size of Mn, the higher the priority score Mn of the n-number air compressors is, the higher the priority is, the more the air compressor number n is arranged at the front of the position of the queue, and the more the air compressor number n is arranged at the front of the position of the queue is, the more the priority score Mn isThen according toThe priority of the air compressor is from high to low, and the corresponding air compressor number sequence is as follows: { n 1 ，n 2 ，……，n N-1 ，n N ' record as a group team [ N ]]。
In the step 6, the sequence of the air compressor number is output: { n 1 ，n 2 ，……，n N-1 ，n N "array team [ N ]]。
The control method for the start-stop air compressor comprises the following detailed steps:
1. the start-stop air compressor control module 12 collects the air compressor number sequences team [ N ], x and the running state of the air compressor, and then the step 2 is entered.
2. And starting all the air compressors in a non-running state in all the air compressors with the first x elements in the air compressor number of team [ N ]. Expressed in language C-like form:
for（j=0，j<x,j++）
{
if (the team [ j ] number air compressor is in a non-running state), starting the team [ j ] number air compressor;
}
and then proceeds to step 3.
3. And after the air compressors with the number of team [ N ] of the first x elements are removed, stopping all the air compressors in the running state in all the remaining air compressors. Expressed in language C-like form:
for（j=x，j<N,j++）
{
if (the team [ j ] number air compressor is in an operation state), stopping the team [ j ] number air compressor;
}
and then returns to step 1.
In the method, j is an intermediate control variable and is a natural number.
The invention relates to a compressed gas control system comprising a plurality of air compressors and a control method thereof, which have the following technical effects:
1) The compressed gas control system comprising a plurality of air compressors and the control method thereof can solve the problem that when the technology of an air compressor station of a compressed gas system is modified, the number of the air compressors of a 0-level main air compressor unit, each level of standby air compressor unit and a full air compressor station is changed, the starting pressure of the 0-level main air compressor unit and each level of standby air compressor unit is changed, and when the weight values corresponding to various working condition factors are changed, control programs are required to be rewritten or changed on a large scale. The method is a portable, universal and modularized air compressor control method, can be flexibly expanded, can flexibly change the number of the air compressors of the 0-level main air compressor unit, each-level standby air compressor unit and the full air compressor station when the control system technology is modified, can flexibly change the starting pressure of the 0-level main air compressor unit and each-level standby air compressor unit, and can flexibly change the weight value corresponding to various working condition factors without large-scale modification or redesign of the universal control method of the air compressor of the compressed air system for writing control programs, and can greatly save manpower, material resources and financial resources by only modifying the parameters of the air compressor station, the starting and stopping parameters and the rotation parameters through a man-machine interaction device.
2) The control method for the compressed air comprising a plurality of air compressors has wide applicability and is suitable for the condition that all air compressors of an air compressor station of a compressed air system are required to have uniform shutdown pressure. The start-stop parameter, the air compressor station parameter and the rotation parameter can be flexibly set according to actual needs, and the conditions are not limited.
3) The number of the air compressors is calculated by the number of the air compressors, the rotation sequencing module is a priority rotation sequencing method, the modularized programming is realized, and the control module of the air compressors is a control method of the air compressors, and the modularized programming is realized. After the modularized programming is realized, the single control function module has simple and efficient program, fewer execution sentences, low memory occupancy rate, short execution period and higher efficiency. After the modular programming is realized, the functions of the modules are relatively independent and stable, the modules are not easily influenced by the mutual coupling of other programs, the programs are easy to read and maintain, and the program running is not easy to make mistakes and fly away. After the modular programming is realized, the complex functions can be simplified, and the complex and difficult-to-realize functions are disassembled into simple and easy-to-realize sub-functions, so that the design, the extension and the derivatization are convenient.
Drawings
FIG. 1 is a schematic diagram of a compressed gas control system according to the present invention.
Fig. 2 is a flow chart of a method for calculating the number of air compressors.
Fig. 3 is a flow chart of the priority round robin sequencing method of the present invention.
Fig. 4 is a schematic flow chart of a control method of the start-stop air compressor of the invention.
Detailed Description
The compressed gas control system comprises a plurality of air compressors as pressurizing equipment, and comprises a pressure vessel 1, a non-pressure vessel 2, a pipeline 3, pressurizing equipment 4, a sensor 5, a general control function module 6, a man-machine interaction device 7, an electric circuit 8 and a communication circuit 9.
The pressure vessel 1 is a pressurized gas tank, stores pressurized gas, and waits for the pressurizing device 4 to pressurize the pressureless gas in the pressureless vessel 2 to the pressure vessel 1.
The pressureless container 2 is a pressureless gas tank or gas bag, storing pressureless gas.
The pressure vessel 1 is connected with the pressurizing device 4 through the first pipeline 3, and the pressurizing device 4 is connected with the pressureless vessel 2 through the second pipeline.
The pressing device 4 is n air compressors, the numbers of the n air compressors are 1# and 2# … … n#, and the starting and stopping control of the universal control function module 6 is received through the electric loop 8.
The sensor 5 collects physical quantity parameters or status signals of the pressure vessel 1, the pressureless vessel 2, the pipeline 3 and the pressurizing device 4 in the compressed gas system, such as pressure of the pressure vessel 1, pressure of the pipeline 3, running state of the air compressor of the pressurizing device 4, fault state of the air compressor, manual automatic state of the air compressor, running times of the air compressor, running time of the air compressor and the like, and transmits the signals to the general control function module 6 through the electric loop 8.
Sensor 5, measuring pressure using a pressure transmitter with the brand KELLER, model PA.23SY/100 bar/81594.55; the operation state of the air compressor of the pressing device 4 can be measured by adopting a power loop contactor auxiliary contact, the manual automatic state of the air compressor can be measured by adopting a manual automatic switching handle auxiliary contact, the operation times of the air compressor can be measured by adopting a counting device, the operation time of the air compressor can be measured by adopting a timer, and the fault state of the air compressor is measured by adopting conventional technical means such as an internal sensor of the air compressor.
The general control function module 6 receives the control parameters of the compressed air system set by the man-machine interaction device 7 through the communication loop 9: start-stop parameters, air compressor station parameters, rotation parameters, and according to the compressed gas system status signals collected by the sensor 5 received through the electrical circuit 8: the pressure vessel 1 pressure P', the pipeline 3 system pressure P and various working condition factor state signals (the air compressor running state, the air compressor fault state, the air compressor manual automatic state, the running times of the air compressors, the running time of the air compressors and the like) of all air compressors, which are directly or indirectly acquired, are logically processed by adopting a compressed air control method comprising a plurality of air compressors, and then the n air compressors in the air compressor 4 are automatically controlled through an electric loop 8, and meanwhile, the state parameter information of the compressed air system is transmitted to a human-machine interaction device 7 through a communication loop 9.
The start-stop parameters include: starting pressure P of 0-level main air compressor unit 0 Starting pressure P of 1-level air compressor unit 1 Stopping pressure P of 1-level air compressor unit 1 ' … … m-level air compressor set starting pressure P m Equal (m is a natural number), and stopping pressure P of 0-level main air compressor unit 0 ' 1-stage air compressor unit stop pressure P 1 ' 1-stage air compressor unit stop pressure P 1 ' … … m-level air compressor set stop pressure P m ' etc. (m is a natural number). Wherein P is 0 ’>P 0 >P 1 >P 2 >……>P m . P due to uniform shutdown pressure 0 ’=P 1 ’==……=P m ’。
The air compressor station parameters include: total number of air compressors N of compressed air system and number of air compressors N of main air compressor unit 0 Air compressor number N of 1-level standby air compressor unit 1 … … m-level air compressor unit equipped air compressor number N m 。
The rotation parameters include: a fault state weight value a of the air compressor; the manual and automatic state weight value b of the air compressor; a weight value c of the running times of the air compressor; a weight value d of the running time of the air compressor; and the running state weight value e of the air compressor.
The general control function module 6 adopts a PLC with the brand name of Rockwell and model number of 1769-L31 1769-L35E CompactLogix.
The man-machine interaction device 7 communicates with the general control function module 6. Control parameters of the compressed air system set by a user through the man-machine interaction device 7: the start-stop parameter, the air compressor station parameter and the rotation parameter are transmitted to the universal control function module 6, and meanwhile, the man-machine interaction device 7 collects the compressed gas system state parameter information which is transmitted by the universal control function module 6 and comprises a rotation sequence to carry out graphical display.
The human-computer interaction device 7 adopts a touch screen with the brand name of Rockwell and the model number of 2711pc-T10C4D 1.
And the electric loop 8 is connected with the sensor 5 and the general control function module 6, and the pressing device 4 and the general control function module 6, so that transmission of state signals and control signals is realized.
And the communication loop 9 is connected with the general control function module 6 and the man-machine interaction device 7 to realize the transmission of control parameters and state information of the compressed gas system.
The functions of the general control function module 6 consist of a starting air compressor quantity calculating module 10, a rotation ordering module 11 and a starting air compressor control module 12.
The number calculation module 10 of the air compressors is started according to the control parameters of the compressed air system: start-stop parameters, air compressor station parameters, and compressed gas system status signals: the pressure vessel 1 pressure P', the pipeline 3 system pressure P and the like adopt a method for calculating the number of the air compressors, and the number x of the air compressors is output to the air compressor starting and stopping control module 12.
The rotation sequencing module 11 controls parameters according to the compressed gas system: rotation parameters and state signals of various working condition factors of all air compressors of the compressed air system: the air compressor operation state, the air compressor fault state, the air compressor manual-automatic state, the operation times of the air compressor, the operation time of the air compressor and the like of the pressing equipment 4 adopt a priority wheel switching order method, and a switching sequence is output to the start-stop air compressor control module 12. The rotation sequence is an air compressor number sequence array, and the rotation sequence is sequentially arranged according to the order of the priority of the air compressors corresponding to the air compressor numbers from high to low.
The start-stop air compressor control module 12 receives information such as the number x of the start air compressors output by the start air compressor number calculation module 10, the rotation sequence output by the rotation sequencing module 11, and the like, and according to state signals of various working condition factors of all air compressors of the compressed air system: the air compressor running state of the pressing device 4 adopts a start-stop air compressor control method, and outputs an air compressor start-stop control signal to the pressing device 4.
A universal control method for unified shutdown pressure of air compressors of a compressed air system comprises a method for calculating the number of air compressors, a method for sequencing priority wheel change and a method for controlling the air compressors to be started and stopped.
The method for calculating the number of the air compressors comprises the following detailed steps:
step 1, the number calculation module 10 for starting the air compressors collects the parameters P, P 0 、P 0 ’、P 1 …… P m 、 N、 N 0 、N 1 ……N m And (5) entering a step 2. Meaning of each parameter representation referred to in step 1: starting pressure P of 0-level main air compressor unit 0 Starting pressure P of 1-level air compressor unit 1 … … m-level air compressor set starting pressure P m Equal (m is a natural number), the stop pressures of the main air compressor unit and the air compressor units at all levels are the same and are P 0 '. Wherein P is 0 ’>P 0 >P 1 >P 2 >……>P m 。
Step 2, the number calculating module 10 of the air compressors is started to detect whether P is the same as the number of P<P 0 If yes, x=n 0 Step 3, entering a step; if not, enter step 3.
Step 3, the number calculating module 10 of the air compressors is started to detect whether P is detected<P 1 If yes, x=n 0 + N 1 Step 4, entering a step; if not, enter step 4.
……
Step m+2, the number of air compressors started calculation module 10 detects whether P is the same as P<P m If yes, x=n 0 + N 1 +…… + N m Step m+3; if not, entering the m+3 step.
Step m+3, and checking by starting air compressor quantity calculating module 10Determination of whether P>P 0 ' if yes, x=0, go to the m+4 step; if not, directly entering the (m+4) th step.
Step m+4, the number of the air compressors is calculated by the module 10 to output x, and the step 1 is returned.
The method for calculating the number of the air compressors comprises m+4 steps in total.
When m=0, namely, the control system only has a main air compressor unit and 1 to m stages of standby air compressor units are not provided, the method for calculating the number of the air compressors comprises 4 steps in total, wherein the m+2 step is the 2 nd step, the m+3 step is the 3 rd step, and the m+4 step is the 4 th step;
when m=1, namely, the control system only has a main air compressor unit and 1-level standby air compressor units and no 2-m-level standby air compressor units, the method for calculating the quantity of the air compressors comprises 4 steps in total, wherein the m+2 step is the 3 rd step, the m+3 step is the 4 th step, and the m+4 step is the 5 th step;
when m=2, namely, the control system only has a main air compressor unit, a 1-level standby air compressor unit and a 2-level standby air compressor unit, and no 3-m-level standby air compressor unit, the method for calculating the number of the air compressors comprises 4 steps in total, wherein the m+2th step is the 4 th step, the m+3th step is the 5 th step, and the m+4th step is the 6 th step;
and so on.
The line 3 system pressure P can also be replaced by the pressure vessel 1 pressure P' in the present method.
The detailed steps of the priority round robin sequencing method are as follows:
step 1: the rotation sequencing module 11 collects the total number N of the air compressors of the compressed air system.
Step 2: the rotation sequencing module 11 collects various working condition factor state signals of all the air compressors, and calculates and determines various working condition values of all the air compressors.
Step 3: the rotation sequencing module 11 collects weight values of various working condition factors of all air compressors.
Step 4: the rotation sequencing module 11 calculates the priority score of each air compressor according to the working condition values corresponding to the working condition factors of all the air compressors and the corresponding weight values.
Step 5: the rotation sequencing module 11 sequences the priority of all the air compressors in the system according to the priority score of each air compressor, and obtains a corresponding air compressor number sequence array according to the priority of the air compressors from high to low;
step 6: the rotation sequencing module 11 outputs an air compressor number sequence array.
Step 7: the rotation sequencing module 11 detects the operation states of all the air compressors, and if the air compressors stop operating, the step 2 is returned.
In the step 2, the multiple working condition factors include: the operation state of the air compressor, the fault state of the air compressor, the manual and automatic state of the air compressor, the operation times of the air compressor and the operation time of the air compressor. The steps of the invention take the five working condition factors as examples, and the working condition factors can be expanded according to the actual application conditions during actual application.
According to various working condition factors, various working condition values of all air compressors are determined as follows:
in all the air compressors, if the air compressors are in an operation state, the value of the working condition value V is 1; if the air compressor is in a non-running state, the working condition value V takes a value of 0. Let the working condition value of n-number air compressor be V n . Where N.gtoreq.n.gtoreq.1.
In all the air compressors, if the air compressors are in a non-fault state, the value of the working condition value X is 1; if the air compressor cannot work normally, the working condition value X takes a value of 0. Let the working condition value of n-number air compressor be X n . Where N.gtoreq.n.gtoreq.1.
In all the air compressors, if the manual and automatic state of the air compressors is 'automatic', the state working condition value Y takes a value of 1; if the manual and automatic state of the air compressor is manual, the working condition value Y in the state takes a value of 0. The reason for this is that the manual state of the air compressor is set to "automatic" higher priority than to "manual". Let the working condition value of n-number air compressor be Y n . Where N.gtoreq.n.gtoreq.1.
In all the air compressors, the number of the rising edges of the running state of the air compressors can be counted according to the running state of the air compressors to obtain the running times of the air compressors, the running times of the air compressors are ordered, and the working condition value Z of the times of the air compressors corresponding to the times from high to low sequentially takes values of 1,2… N … N-1, N. Where N.gtoreq.n.gtoreq.1. Let the frequency operating mode value of n-number air compressor be Z n 。
In all the air compressors, the running time of the air compressors can be obtained by timing the accumulated duration time of the running state of the air compressors according to the running state of the air compressors, the running time of the air compressors is ordered, and the time is sequentially 1,2 … N … N-1 and N from the time of the corresponding air compressor to the time of the corresponding air compressor. Where N.gtoreq.n.gtoreq.1. Let the number of times operating mode value of n number air compressor machine be U n 。
In the step 3, a fault state weight value a of the air compressor is acquired and set; the manual and automatic state weight value b of the air compressor; a weight value c of the running times of the air compressor; a weight value d of the running time of the air compressor; and e, an operation state weight value e of the air compressor.
The user sets the weight values corresponding to various working condition factors according to the self requirements, and generally, the more important the working condition factors are, the larger the influence is, and the larger the weight is. Normally, in order to ensure normal functions, the necessary working condition factors include the running state of the air compressor, the fault state of the air compressor and the manual and automatic state of the air compressor, and e is more than a and less than b. If the start and stop are controlled only according to the operation times of the air compressor, e > a > b > c > d=0; if the start and stop are controlled only according to the operation time of the air compressor, e > a > b > d > c=0; if the start and stop are controlled according to the operation times and the operation time of the air compressor and preferentially according to the operation times of the air compressor, e > a > b > c > d >0; if the start and stop are controlled according to the operation times and the operation time of the air compressor at the same time, e > a > b > d > c >0.
In the step 4, the priority score m=ax+by+cz+du+ev of each air compressor is calculated respectively; priority score M of n-number air compressor n =aX n +bY n +cZ n +dU n +eV n 。
In the step 5, the priority of the air compressors is ordered according to the size of Mn, the higher the priority score Mn of the n-number air compressors is, the higher the priority is, the more the air compressor number n is arranged at the front of the position of the queue, and the more the air compressor number n is arranged at the front of the position of the queue is, the more the priority score Mn isAccording to the priority of the air compressors from high to low, the corresponding air compressor number sequences are as follows: { n 1 ，n 2 ，……，n N-1 ，n N ' record as a group team [ N ]]。
In the step 6, the sequence of the air compressor number is output: { n 1 ，n 2 ，……，n N-1 ，n N "array team [ N ]]。
The control method for the start-stop air compressor comprises the following detailed steps:
1. the start-stop air compressor control module 12 collects the air compressor number sequences team [ N ], x and the running state of the air compressor, and then the step 2 is entered.
2. And starting all the air compressors in a non-running state in all the air compressors with the first x elements in the air compressor number of team [ N ]. Expressed in language C-like form:
for（j=0，j<x,j++）
{
if (the team [ j ] number air compressor is in a non-running state), starting the team [ j ] number air compressor;
}
and then proceeds to step 3.
3. And after the air compressors with the number of team [ N ] of the first x elements are removed, stopping all the air compressors in the running state in all the remaining air compressors. Expressed in language C-like form:
for（j=x，j<N,j++）
{
if (the team [ j ] number air compressor is in an operation state), stopping the team [ j ] number air compressor;
}
and then returns to step 1.
In the method, j is an intermediate control variable and is a natural number.

Claims (2)

1. The utility model provides a compressed gas control system who contains many air compressors, includes equipment of suppressing (4), sensor (5), general control function module (6), human-computer interaction device (7), its characterized in that:
the pressurizing device (4) is used for pressurizing the pressureless gas in the pressureless container (2) to the pressure container (1);
the pressing device (4) comprises n air compressors, the numbers of the n air compressors are 1# and 2# … … n #, the pressing device (4) is connected with a general control functional module (6), and the general control functional module (6) controls the starting/stopping of the pressing device (4); the n air compressors are divided into m+1 groups from high to low according to the priority of the air compressors, wherein the m is a natural number, and the n air compressors are respectively a 0-level main air compressor unit, a 1-level standby air compressor unit and a … … m-level standby air compressor unit;
the plurality of sensors (5) are respectively arranged on the pressure container (1), the pressureless container (2) and the pressing equipment (4) and are used for collecting the pressure of the pressure container (1), the running state of the air compressor of the pressing equipment (4), the fault state of the air compressor, the manual state of the air compressor and the running times of the air compressor, and the running time of the air compressor, wherein the plurality of sensors (5) are all connected with the universal control function module (6);
the universal control functional module (6) is used for automatically controlling n air compressors in the pressurizing equipment (4), and the universal control functional module (6) is connected with the man-machine interaction device (7);
the general control function module (6) is connected with the man-machine interaction device (7) through the communication loop (9), and receives control parameters of the compressed air system set by the man-machine interaction device (7): start-stop parameters, air compressor station parameters, rotation parameters, and according to compressed gas system status signals collected by the sensors (5) received through the electrical circuit (8): pressure vessel (1) pressure P', line system pressure P, all air compressors multiple operating mode factor status signals: the method comprises the steps that after the operation state of an air compressor, the fault state of the air compressor, the manual state of the air compressor, the operation times of the air compressor and the operation time of the air compressor of the pressurizing equipment (4) are processed, n air compressors in the pressurizing equipment (4) are automatically controlled through an electric loop (8), and meanwhile, the state parameter information of a compressed air system is transmitted to a human-machine interaction device (7) through a communication loop (9); the start-stop parameters include: starting pressure P of 0-level main air compressor unit 0 Starting pressure P of 1-level air compressor unit 1 … … m-level air compressor set starting pressure P m M is a natural number, and the stopping pressure P of the 0-level main air compressor unit 0 ' 1-stage air compressor unit stop pressure P 1 ' … … m-level air compressor set stopping pressure P m 'A'; wherein P is 0 ’>P 0 >P 1 >P 2 >……>P m The method comprises the steps of carrying out a first treatment on the surface of the P due to uniform shutdown pressure 0 ’=P 1 ’=……=P m ’；
The air compressor station parameters include: total number of air compressors N of compressed air system and number of air compressors N of main air compressor unit 0 Air compressor number N of 1-level standby air compressor unit 1 … … m-level air compressor unit equipped air compressor number N m ；
The rotation parameters include: a fault state weight value a of the air compressor; the manual and automatic state weight value b of the air compressor; a weight value c of the running times of the air compressor; a weight value d of the running time of the air compressor; an operation state weight value e of the air compressor;
the functions of the general control function module (6) comprise a starting air compressor quantity calculating module (10), a rotation ordering module (11) and a starting air compressor control module (12);
the air compressor starting quantity calculating module (10) is used for calculating the quantity of the air compressors according to control parameters of the compressed air system: start-stop parameters, air compressor station parameters, and compressed gas system status signals: the pressure vessel (1) pressure P' and the pipeline system pressure P are calculated by adopting the number of the air compressors to output the number x of the air compressors to the air compressor control module (12);
the rotation sequencing module (11) is used for controlling parameters according to a compressed gas system: rotation parameters and state signals of various working condition factors of all air compressors of the compressed air system: the operation state of the air compressor of the pressurizing equipment (4), the failure state of the air compressor, the manual and automatic state of the air compressor, the operation times of the air compressor, the operation time of the air compressor, adopting a priority wheel change sequencing method, and outputting a rotation sequence to a start-stop air compressor control module (12);
the starting and stopping air compressor control module (12) is used for receiving information such as the starting air compressor number x output by the starting air compressor number calculation module (10), the rotation sequence output by the rotation sequencing module (11) and the like, and outputting an air compressor starting and stopping control signal to the pressurizing equipment (4) by adopting a starting and stopping air compressor control method according to state signals of various working condition factors of all air compressors of the compressed air system;
the method for calculating the number of the air compressors comprises the following steps:
step 1, acquiring parameters P, P by a number calculation module (10) for starting the air compressors 0 、P 0 ’、P 1 …… P m 、 N、 N 0 、N 1 ……N m Step 2, entering a step 2; in step 1: starting pressure P of 0-level main air compressor unit 0 Starting pressure P of 1-level air compressor unit 1 … … m-level air compressor set starting pressure P m M is a natural number; the stop pressure of the main air compressor unit and the air compressor units at all levels is the same as P 0 'A'; wherein P is 0 ’>P 0 >P 1 >P 2 > ……>P m ；
Step 2, detecting whether P is detected by a number calculation module (10) for starting the air compressors<P 0 If yes, x=n 0 Step 3, entering a step; if not, entering a step 3;
step 3, detecting whether P is detected by a number calculation module (10) for starting the air compressors<P 1 If yes, x=n 0 + N 1 Step 4, entering a step; if not, entering a step 4;
……
step m+2, starting an air compressor quantity calculating module (10) to detect whether P is detected or not<P m If yes, x=n 0 + N 1 +…… + N m Step m+3; if not, entering the m+3 step;
step m+3, starting an air compressor quantity calculating module (10) to detect whether P is detected or not>P 0 ' if yes, x=0, go to the m+4 step; if not, directly entering the (m+4) th step;
step m+4, the number calculation module (10) of the starting air compressors outputs x and returns to step 1; when m=0, namely, the control system only has a main air compressor unit and 1 to m stages of standby air compressor units are not provided, the method for calculating the number of the air compressors comprises 4 steps in total, wherein the m+2 step is the 2 nd step, the m+3 step is the 3 rd step, and the m+4 step is the 4 th step;
when m=1, namely, the control system only has a main air compressor unit and 1-level standby air compressor units and no 2-m-level standby air compressor units, the method for calculating the quantity of the air compressors comprises 4 steps in total, wherein the m+2 step is the 3 rd step, the m+3 step is the 4 th step, and the m+4 step is the 5 th step;
when m=2, namely, the control system only has a main air compressor unit, a 1-level standby air compressor unit and a 2-level standby air compressor unit, and no 3-m-level standby air compressor unit, the method for calculating the number of the air compressors comprises 4 steps in total, wherein the m+2th step is the 4 th step, the m+3th step is the 5 th step, and the m+4th step is the 6 th step.
2. The air compressor priority wheel change sequencing method based on the compressed air control system comprising a plurality of air compressors as claimed in claim 1, is characterized by comprising the following steps:
step 1: the rotation sequencing module (11) collects the total number N of air compressors of the compressed air system;
step 2: the rotation sequencing module (11) collects state signals of various working condition factors of all the air compressors, and calculates and determines various working condition values of all the air compressors;
step 3: the rotation sequencing module (11) collects weight values of various working condition factors of all air compressors;
step 4: the rotation sequencing module (11) calculates the priority score of each air compressor according to the working condition values corresponding to various working condition factors of all the air compressors and the corresponding weight values;
step 5: the rotation sequencing module (11) sequences the priorities of all the air compressors in the system according to the priority score of each air compressor, and obtains a corresponding air compressor number sequence array according to the priority of the air compressors from high to low;
step 6: the rotation sequencing module (11) outputs an air compressor number sequence array;
step 7: the rotation sequencing module (11) detects the running states of all the air compressors, and if the air compressors stop running, the step 2 is returned;
in the step 2, the multiple working condition factors include: the operation state of the air compressor, the fault state of the air compressor, the manual and automatic state of the air compressor, the operation times of the air compressor and the operation time of the air compressor;
according to various working condition factors, various working condition values of all air compressors are determined as follows:
in all the air compressors, if the air compressors are in an operation state, the value of the working condition value V is 1; if the air compressor is in a non-running state, the value of the working condition value V is 0; let the working condition value of n-number air compressor be V n The method comprises the steps of carrying out a first treatment on the surface of the Wherein N > 1;
in all the air compressors, if the air compressors are in a non-fault state, the value of the working condition value X is 1; if the air compressor cannot work normally, the value of the working condition value X is 0; let the working condition value of n-number air compressor be X n The method comprises the steps of carrying out a first treatment on the surface of the Wherein N > 1;
in all the air compressors, if the manual and automatic state of the air compressors is 'automatic', the state working condition value Y takes a value of 1; if the manual and automatic state of the air compressor is manual, the working condition value Y of the state is 0; the reason for this is that the manual state of the air compressor is set to be "automatic" with higher priority than "manual"; let the working condition value of n-number air compressor be Y n The method comprises the steps of carrying out a first treatment on the surface of the Wherein N > 1;
in all the air compressors, the number of the rising edges of the running states of the air compressors can be counted according to the running states of the air compressors to obtain the running times of the air compressors, the running times of the air compressors are ordered, and the working condition value Z of the times of the air compressors corresponding to the times from high to low sequentially takes values of 1,2 … N … N-1 and N; wherein N > 1; let the frequency operating mode value of n-number air compressor be Z n ；
In all the air compressors, the running time of the air compressors can be obtained by timing the accumulated duration time of the running state of the air compressors according to the running state of the air compressors, the running time of the air compressors is ordered, and the time is sequentially 1,2 … N … N-1 and N from the time of the corresponding air compressor to the time of the short air compressor; wherein N is equal to or greater than N is equal to or greater than 1; let the number of times operating mode value of n number air compressor machine be U n ；
In the step 3, a fault state weight value a of the air compressor is acquired and set; the manual and automatic state weight value b of the air compressor; a weight value c of the running times of the air compressor; a weight value d of the running time of the air compressor; an operation state weight value e of the air compressor;
the user sets weight values corresponding to various working condition factors according to the self requirements, wherein the more important the working condition factors are, the larger the influence is, and the larger the weight is; normally, in order to ensure normal functions, the necessary working condition factors are the running state of the air compressor, the fault state of the air compressor and the manual and automatic state of the air compressor, and e is more than a and less than b; if the start and stop are controlled only according to the operation times of the air compressor, e > a > b > c > d=0; if the start and stop are controlled only according to the operation time of the air compressor, e > a > b > d > c=0; if the start and stop are controlled according to the operation times and the operation time of the air compressor and preferentially according to the operation times of the air compressor, e > a > b > c > d >0; if the start and stop are controlled according to the operation times and the operation time of the air compressor at the same time, e > a > b > d > c >0;
in the step 4, the priority score m=ax+by+cz+du+ev of each air compressor is calculated respectively; priority score M of n-number air compressor n =aX n +bY n +cZ n +dU n +eV n ；
In the step 5, the priority of the air compressors is ordered according to the size of Mn, the higher the priority score Mn of the n-number air compressors is, the higher the priority is, the more the air compressor number n is arranged at the front of the position of the queue, and the more the air compressor number n is arranged at the front of the position of the queue is, the more the priority score Mn isAnd according to the priority of the air compressors from high to low, corresponding to the number sequence of the air compressors: { n 1 ，n 2 ，……，n N-1 ，n N ' record as a group team [ N ]]；
In the step 6, the sequence of the air compressor number is output: { n 1 ，n 2 ，……，n N-1 ，n N "array team [ N ]]。
CN202310089506.3A 2023-01-17 2023-01-17 Compressed gas control system comprising multiple air compressors and control method thereof Active CN116292221B (en)

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