CN106527332B - Dissolved oxygen Precise control system - Google Patents
Dissolved oxygen Precise control system Download PDFInfo
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- CN106527332B CN106527332B CN201610988833.2A CN201610988833A CN106527332B CN 106527332 B CN106527332 B CN 106527332B CN 201610988833 A CN201610988833 A CN 201610988833A CN 106527332 B CN106527332 B CN 106527332B
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- frequency conversion
- air blower
- conversion air
- frequency
- dissolved oxygen
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/05—Programmable logic controllers, e.g. simulating logic interconnections of signals according to ladder diagrams or function charts
- G05B19/058—Safety, monitoring
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/10—Plc systems
- G05B2219/16—Plc to applications
- G05B2219/163—Domotique, domestic, home control, automation, smart, intelligent house
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Feedback Control In General (AREA)
Abstract
It is for solving existing homogeneous system automation control and energy-saving effect is not good enough and data record and the not good enough technical problem of statement analysis Functional Design and designs the present invention relates to a kind of dissolved oxygen Precise control system.The control system includes frequency conversion air blower, first sedimentation basin, dissolved oxygen pond；Its main points is that the pipeline that the frequency conversion air blower parallel connection picks out is successively arranged manifold pressure sensor, general pipeline air flow sensor, and the pipeline that one end parallel connection picks out is equipped with blow valve, and dissolved oxygen pond passes through the data of binary channels DO dissolved oxygen sensor acquisition DOIT respectively；And overall intelligence linkage control is carried out by the PLC control system of PLC controller, function is monitored to above equipment instrument in the SCADA system of active station；PLC control system includes frequency conversion air blower intelligent controller and PLC intelligent controller, and PLC intelligent controller is equipped with touch screen.Its control it is accurate, it is easy to operate, reading data and record detailed, energy-saving effect is good.
Description
Technical field
The present invention relates to Industrial sewage treatment systems, are a kind of dissolved oxygen Precise control systems.
Background technique
Sewage treatment refers to industry or sanitary sewage by processing, reaches the water quality for draining a certain water body or reusing and wants
Seek the process purified to it.Automatic industrial sewage disposal system generally uses intuitive display interface, realizes production work
Skill graphically monitors in real time, various energy consumption real-time displays；Simultaneity factor has carried out targeted design to energy-saving problem, uses
A variety of scientific methods carry out optimized control.Such as: carrying out pumping plant unit binding control, Optimized Operation, reduce energy consumption, extend unit
Service life；Water quality data situation is automatically analyzed, suitable medication ratio is calculated, saves drug cost；Aeration tank dissolved oxygen is dense
The stability contorting of degree reduces aerating system energy consumption etc..Dissolved oxygen in sewage treatment refers to that the molecular oxygen in air is dissolved in
In water, oxygen in water number be an index for measuring water body self-purification ability, oxygen in the dissolved oxygen content and air in water
Partial pressure, the temperature of water have substantial connection.In natural conditions, the oxygen content in air changes less, therefore water temperature is main
Factor, water temperature is lower, and the content of oxygen in water is higher.
Meanwhile the molecular oxygen being dissolved in the water is known as dissolved oxygen, is usually denoted as D0, with the milligram number of oxygen in every liter of water
It indicates；The control mode that intuitive display interface generally uses programmable logic controller (PLC) (PLC) and PID controller to combine.Its
In, programmable logic controller (PLC) (PLC) is a kind of using a kind of programmable memory, is used for its internally stored program, execution
The user oriented instruction such as logical operation, sequential control, timing, counting and arithmetical operation, and by number or analog pattern input/
Various types of mechanical or production process the equipment of output control.PID controller is one common in Industry Control Application
Feedback loop component is made of proportional unit P, integral unit I and differentiation element D；The basis of PID control is ratio control, product
Sub-control system can eliminate steady-state error, but can increase overshoot；Differential control can accelerate Great inertia system response speed and decrease
Overshoot trend.
Application number 201520416996.4 as disclosed in Chinese patent literature, authorized announcement date 2015.11.04 are practical
New Name " a kind of biochemical waste water treatment pool dissolved oxygen automatic regulating system "；The dissolved oxygen automatic regulating system includes for examining
Survey dissolution oxygen detection, PLC control device, frequency converter and the roots blower of dissolved oxygen concentration in aeration tank；Dissolve oxygen detection
The concentration signal that will test is converted into 4-20mA signal feedback to PLC control device, and PLC control device is by the concentration signal of acquisition
After being compared with setting value, frequency converter operating instruction is given, frequency converter exports running frequency according to operating instruction, passes through operation frequency
The change of rate makes the revolving speed of roots blower change, and adjusts dissolved oxygen concentration in aeration tank in time.But above-mentioned control
System operatio is more inconvenient, and automatic energy saving effect is poor.
Summary of the invention
To overcome above-mentioned deficiency, the purpose of the present invention is providing a kind of dissolved oxygen Precise control system to this field, make
It solves existing homogeneous system automation control and energy-saving effect is not good enough and data record and statement analysis Functional Design it is not good enough
The technical issues of.The purpose is to what is be achieved through the following technical solutions.
A kind of dissolved oxygen Precise control system, the control system at the beginning of four 55KW frequency conversion air blowers, one including precipitating
Pond, four dissolved oxygen ponds and corresponding manifold pressure sensor, general pipeline air flow sensor, two, the dissolved oxygen pond, one group of setting,
It is protruded into dissolved oxygen pond by pipeline respectively after frequency conversion air blower is in parallel, first sedimentation basin is connected with the dissolved oxygen pond of side respectively by pipeline
It connects, which is connected by the dissolved oxygen pond of pipeline and the other side；It is characterized in that the frequency conversion air blower parallel connection picked out
Pipeline is successively arranged manifold pressure sensor, general pipeline air flow sensor, and the pipeline that one end parallel connection picks out is equipped with blow valve, and every group molten
Oxygen pond is respectively equipped with binary channels DO dissolved oxygen sensor；And overall intelligence linkage control is carried out by the PLC control system of PLC controller
System, to the following monitoring function of above equipment instrument progress in the SCADA system of active station: the start-up and shut-down control of frequency conversion air blower,
Far/mode, operating status, malfunction, soft alarm, history accumulated running time, this accumulated running time, frequency are given
Fixed, frequency feedback, the remote switch of blow valve, reach position, close in place, soft alarm and air hose manifold pressure, AFIT-01 wind
Measure real time data, APIT-01 pressure real time data, D0 target given value, DOIT-01~DOIT-04 real time data, D0 alarm,
Air quantity target given value, air quantity are alarmed and the parameter monitoring of pressure alarm；General pipeline air flow sensor acquires AFIT-01 air quantity number
According to manifold pressure sensor acquires APIT-01 pressure data；Binary channels D0 dissolved oxygen sensor acquires DOIT-01~DOIT-04
Data；The PLC control system of the PLC controller includes two sets of frequency conversion air blower intelligent controllers of 55KW × 2 and a set of PLC intelligence
It can control instrument, PLC intelligent controller is equipped with touch screen；The active station uses Microsoft WIN732 Professional operating system, and
Dissolved oxygen fining SCACD control system is installed.
The D0 of the binary channels D0 dissolved oxygen sensor alarms are as follows: Gao Gao, high and low, low；The wind of general pipeline air flow sensor
Amount alarm are as follows: low, low；The pressure alarm of manifold pressure sensor are as follows: high, Gao Gao.
The frequency conversion air blower is controlled in shifts using semi-automatic semi-manual mode, real by specified LEAD frequency conversion air blower
It is existing；Specific implementation process are as follows: by specified 1#, 2#, 3#, 4# any one be LEAD, determine the subsequent sequence of operation, then according to
Permutation and combination shares 24 kinds of LEAD selection modes:
1# is LEAD:
B-1→B-2→B-3
B-1→B-3→B-2
B-1→B-4→B-3
B-1→B-3→B-4
B-1→B-2→B-4
B-1→B-4→B-2
2# is LEAD:
B-2→B-4→B-3
B-2→B-3→B-4
B-2→B-1→B-3
B-2→B-3→B-1
B-2→B-1→B-4
B-2→B-4→B-1
3# is LEAD:
B-3→B-1→B-4
B-3→B-4→B-1
B-3→B-1→B-2
B-3→B-2→B-1
B-3→B-4→B-2
B-3→B-2→B-4
4# is LEAD:
B-4→B-1→B-2
B-4→B-2→B-1
B-4→B-1→B-3
B-4→B-3→B-1
B-4→B-2→B-3
It is respectively that " break tour starts ", " break tour terminates " and a LEAD drop-down choice box realize people that two buttons, which are arranged,
Machine interactive function, frequency conversion air blower will forbid LEAD pulldown function during running；When needing to be operated in shifts, click first
" break tour terminates " button, linkage stops all frequency conversion air blowers being currently running at this time, and LEAD pulldown function menu will be activated,
LEAD sequence is reset, manual alignment is carried out to the runing time of four frequency conversion air blowers in practical operation in shifts.Such as: false
If 1# runing time is 9800h, 2# runing time is 9795h, and 3# runing time is 9829h, and 4# runing time is 9899h, this
When it is shortest according to runing time be preferential initiating sequence, i.e., specified B-2 → B-1 → B-3 sequence is clicked " after selection
Class starts " button, then start linkage starting frequency conversion air blower.
B) the adding machine control of the frequency conversion air blower: the unit number control root Ju D0 of frequency conversion air blower is automatic or flow from
It moves to carry out PID fining coarse adjustment scheme control.Such as: First frequency conversion air blower is not able to satisfy frequency control and requires, and frequency
Rate reaches 50HZ, then the number of units value that second frequency conversion air blower is exported according to PID is (practical floating since number of units is integer value
Points round up and export after operation, the same below) second frequency conversion air blower operation of starting, specify at this time PID export from
50HZ starts operation, controls second frequency conversion air blower and (in view of second frequency conversion air blower of starting, deposits on the time with frequency operation
In lag factor, dissolved oxygen is larger from deviation from the desired value at this time, therefore when starting two frequency conversion air blower operations, it is desirable that rapidly
Dissolved oxygen is promoted to a normal value, the same below)；It it is not still able to satisfy control wants if two frequency conversion air blowers reach 50HZ
It asks, then PID is specified in the number of units value starting third platform frequency conversion air blower operation that third platform frequency conversion air blower is exported according to PID at this time
The operation since 50HZ is exported, control third platform frequency conversion air blower is run with frequency.
On the contrary, oxygen dissolving value is still higher if three frequency conversion air blowers are run in low-limit frequency, then frequency conversion air blower subtracts one
According to the number of units value of PID output, (since number of units is integer value, practical floating number rounds up and exports after operation, below
The operation for stopping third platform frequency conversion air blower together), specifies PID to export the operation since low-limit frequency, controls two frequency conversions at this time
(in view of stopping third platform frequency conversion air blower, there are lag factors on the time, and dissolved oxygen is from expectation at this time with frequency operation for air blower
It is larger to be worth deviation, therefore when stopping a frequency conversion air blower operation, it is desirable that dissolved oxygen is dropped into a normal value rapidly, with
Similarly hereinafter)；If two frequency conversion air blowers are run in low-limit frequency, oxygen dissolving value is still higher, then frequency conversion air blower subtracts one according to PID
The number of units value of output stops the operation of second frequency conversion air blower, specifies PID to export the operation since low-limit frequency at this time.But appoint
In the case of what, it is necessary to assure there is a frequency conversion fan running always, and the minimum lower frequency limit of frequency converter can guarantee frequency conversion drum
Fan outlet pressure is enough to overcome the water resistance of end, it is ensured that frequency conversion air blower not stall.
C) the D0 automatic control mode: answering switching undisturbed between mode, under D0 automatic running pattern, D0 concentration essence
Refinement control fine tuning scheme is intelligently adjusted by the frequency converter of frequency conversion air blower and is realized, pid parameter is provided in operation screen and adjusts face
Plate realizes that minimum operating frequency and maximum running frequency are set, and frequency converter frequency is exported according to D0 concentration and D0 concentration target value
Compare (wherein D0 concentration PV value selection scheme pass through drop-down menu button realize DOIT-01, DOIT-02, DOIT-03, DOIT-
04, minimum DOIT, average value DOIT, average value DOIT-01 and DOIT-02 (east), average value DOIT-03 and DOIT-04 (west)
Selection) realize PID closed loop intelligently adjust；D0 concentration Precise control coarse adjustment scheme by frequency conversion air blower intelligent unit number control
It realizes, finally realizes that D0 precision adjusts target by the compound two close cycles intelligentized control method algorithm of accurate adjustment and coarse adjustment.
C) FLOW automatic control mode: the binary channels D0 dissolved oxygen sensor during maintenance, operator by D0 from
Dynamic model formula is manually switched under FLOW automatic mode, for guarantee dissolved oxygen can smooth transition arrive FLOW control model, program oneself
It is dynamic to be arranged using air quantity value of feedback current under dissolved oxygen mode as setting value, so that the smooth transition requirement of air quantity is realized, because of work
Condition real-time change, system requirements operator can change the experience setting value of correct setting aeration air quantity according to operating condition, at this time
Air quantity setting tracking intelligently adjusted and realize by the frequency converter of frequency conversion air blower, pid parameter is provided in operation screen and adjusts panel,
Realize minimum operating frequency and maximum running frequency, frequency converter frequency output is made according to general pipeline air quantity setting value and value of feedback deviation
PID is exported after calculating and is adjusted, and is finally reached the setting real-Time Tracking Control of air quantity.
D) the frequency conversion air blower and blow valve link: when starting First frequency conversion air blower, it is first turned on blow valve, to
After blow valve reaches position, after delay certain time (can set), blow valve is closed, when starting more than two frequency conversion air blowers, is begun
Blow valve is closed eventually, prevents air quantity emptying discharge；When stopping all frequency conversion air blowers, it is first turned on blow valve, is opened to blow valve
After in place, after delay certain time (can set), frequency conversion air blower is closed, as long as frequency conversion air blower closed state, corresponding to put
Empty valve will automatically turn on.
E) act when the failure of frequency conversion air blower: when the frequency conversion air blower being currently running, which breaks down, shuts down, other are standby
With frequency conversion air blower automatic running, it is ensured that dissolved oxygen precision control requires.
F) meter parameter more acts in limited time: when the appearance of D0 dissolved oxygen is high, high and low, low or air quantity is low, low lower bound
When alarm, sound-light alarm will be exported, controls operator in notice.
Rationally, stability is good for structure of the invention design, and control is accurate, easy to operate, reading data and records detailed, energy conservation
Effect is good；It is suitable as with frequency conversion air blower, sedimentation basin, dissolved oxygen pond dissolved oxygen control system promotion and application, and its
The structure of homogeneous system is improved.
Detailed description of the invention
Fig. 1 is process flow diagram of the invention.
Fig. 2 is WINCC system interface schematic diagram of the invention.
Figure number and title: 1, frequency conversion air blower, 2, first sedimentation basin, 3, dissolved oxygen pond, 4, manifold pressure sensor, 5, total
Manage-style quantity sensor, 6, binary channels D0 dissolved oxygen sensor.
Specific embodiment
Now in conjunction with attached drawing, structure of the invention and use are further described.As shown in Figure 1, dissolved oxygen fining control
The system requirements of system processed is specific as follows: hardware: the above PC of Pentium P42G or compatible；Memory: minimum 2GB recommends 4GB；It is aobvious
Show device: VGA, SVGA or any graphics adapter for supporting desktop operating system.It is required that at least showing 256 colors；Mouse: any PC
Compatible mouse；Communication: 10M/100M TCP/IP；Operating system: WinXPSP3 simplified Chinese edition, WIN7 professional version.The dissolved oxygen
Precise control system can save production cost and improve production efficiency, with PLC (S7-300 series) hardware of SIEMENS company
It is development platform with WINCC7.0 software, has extension convenient, it is stable, the characteristics of strong antijamming capability, fully meet molten
The needs for solving oxygen Precise control realize the optimization operation of system.The a set of touch screen of dissolved oxygen Precise control system configuration
System carries out human-machine interface configuration using Beijing the Kunlun on-state MCGS insertion version configuration software, configures an active station, active station
Using the host computer configuration software WINCC 7.0 of SIEMENS, so that this system has the characteristics that easy to operate, friendly interface, lead to
The Industrial Ethernet and the station SIEMENS S7-300 PLC for crossing standard carry out data exchange, have strong real-time, data throughout
Greatly, many advantages, such as graphically outstanding, database is complete, monitoring is flexible.System passes through powerful hardware configuration and effective soft
Part is supported, can timely reflect the operation conditions of whole system all devices, passes through acquisition to relevant parameter (including wind
Amount, pressure, oxygen dissolving value) analysis is calculated, the start and stop of equipment, running frequency etc. are controlled, guarantee whole system safe and reliable operation, together
When operator industrial analysis carried out according to detailed data record and report, find system hidden trouble in time, optimize process operation
Parameter greatly improves production stability and the efficiency of management.The dissolved oxygen Precise control system follows sewage treatment process and wants
It asks, the start and stop number of units and operation frequency of relevant device is automatically controlled by the system parameter (including air quantity, pressure, oxygen dissolving value) of acquisition
Rate realizes the control requirement of dissolved oxygen fining.The system process function of the dissolved oxygen Precise control system is according to being mentioned
The sewage treatment PI&D drawing of confession and the understanding of related data, and the analysis of technique is improved and adjusted in debugging process
The dissolved oxygen Precise control system that examination is completed finally realizes following control process function.
The specific structure of the dissolved oxygen Precise control system is as follows: the control system includes four 55KW frequency conversion air blowers
1,2, four dissolved oxygen ponds 3 of sedimentation basin at the beginning of one and corresponding manifold pressure sensor 4, general pipeline air flow sensor 5, it is described molten
Two, oxygen pond, one group of setting is protruded into dissolved oxygen pond by pipeline respectively after frequency conversion air blower is in parallel, and first sedimentation basin passes through pipeline point
It is not connect with the dissolved oxygen pond of side, which is connected by the dissolved oxygen pond of pipeline and the other side；Its main points is frequency conversion air blast
The pipeline that 1 parallel connection of machine picks out is successively arranged manifold pressure sensor 4, general pipeline air flow sensor 5, and the pipeline that one end parallel connection picks out is set
There is blow valve, every group of dissolved oxygen pond is respectively equipped with binary channels D0 dissolved oxygen sensor 6；And by the PLC control system of PLC controller into
Row overall intelligence linkage control carries out following monitoring function: frequency conversion drum to above equipment instrument in the SCADA system of active station
The start-up and shut-down control of blower, it is remote/with regard to mode, operating status, malfunction, soft alarm, history accumulated running time, this accumulative transports
Row time, frequency be given, frequency feedback, the remote switch of blow valve, reach position, close in place, soft alarm and air hose general pipeline pressure
Power, AFIT-01 air quantity real time data, APIT-01 pressure real time data, D0 target given value, DOIT-01~DOIT-04 are real-time
Data, D0 alarm, air quantity target given value, air quantity are alarmed and the parameter monitoring of pressure alarm；General pipeline air flow sensor 5 acquires
AFIT-01 air quantity data, manifold pressure sensor 4 acquire APIT-01 pressure data；Binary channels D0 dissolved oxygen sensor 6 acquires
DOIT-01~DOIT-04 data；The PLC control system of the PLC controller includes the two sets of frequency conversion of 55KW × 2 air blower intelligence
Controller and a set of PLC intelligent controller, PLC intelligent controller are equipped with touch screen；The active station uses Microsoft WIN732
Professional operating system, and dissolved oxygen fining SCACD control system is installed.
As shown in Fig. 2, the software function of the dissolved oxygen Precise control system introduce it is specific as follows: the computer system of active station
After system starting, WINCC project configuration meeting automatic running, into welcome screen.User is by clicking picture upper left corner WINCC icon
Under log in icon, pop up logon dialog frame.Username and password is inputted in dialog boxes for login and carries out authorization register, is examined
The safety of worry system, for the stringent limitation that the permission of this monitoring software operator carries out, the use for needing system to approve
Name in an account book and password could control equipment, not will be unable to obtain monitoring power by legal login.It is recommended that having permission user such as
Fruit leaves active station, and row permission that come in is nullified, and prevents other to be unfamiliar with the personnel of system and carries out maloperation.Then, in key frame
See that, to be grouped the system navigation that drop-down menu forms, user carries out screen switching by clicking, data needed for obtaining, figure in top
Table, report, the functions such as system setting.Realtime Alerts uniline message column is seen above navigation, any equipment of system occurs any
Failure and system parameter exceed system regime values, and relative alarm information can be shown in Alarm column: the alarm date and when
Between, source, description, state etc..Need simply to introduce the alarm mechanism of lower WINCC herein: when there is new alarm to occur,
It will appear corresponding warning message in Realtime Alerts column, state is " arrival ", and is being flashed；When trigger the alarm physical condition
It is disappeared and (failure of alarm or mistake is caused to be handled and resetted by investigation), then corresponding alarm signal in Alarm column
Breath state will become " reach and leave ".Operations staff confirms this information by the icon of choosing on the right of Alarm column,
Confirmation to the two kinds of different conditions mentioned in alarm mechanism above can show different states in Alarm column: when to " arrival "
Alarm confirmed after, then the information will no longer flash, and indicate that related personnel has been apprised of the alarm, and set about handling；
After confirming to " reach and leave ", which will disappear from Realtime Alerts column.Treat the correct process flow of alarm:
It was found that alarm → informing expert engineer or operations staff → expert engineer or operations staff check that warning message → confirmation should
It is carried out if necessary behind the source of warning message and reason → investigation failure or mistake → failure or error exception necessary multiple
Position.The alert process process is corresponded to, the warning message in Alarm column undergoes following states: new alarm: " arrival " flashing → confirmation
Afterwards: " arrival " non-flickering → troubleshooting and message disappears from Alarm column after resetting.
The system flow screen operation of software is as follows: in system navigation bar click " process flow chart " button after enter be
System process flow chart picture.In system flow picture, all controlled plants all show equipment state, all accesses with color
Instrument all shows that real time data, information are complete very clear in corresponding position.The corresponding state of equipment color: equipment is red one
Indicate that the equipment is in stopping or closed state；Equipment is that green-indicates that the equipment is in operation or open state；Equipment is Huang
Color one indicates that the equipment is in malfunction.System measured data is that green numerical value is aided with bottom frame and shows in picture, for can not
Setting state；System parameter settings data are aided with bottom frame in picture for blue values and show, for that can set state.User passes through
The bound report of all access instrument is mainly arranged in screen switching to " instrument alarm " picture by navigation bar button in this screen
Alert threshold values.Then, user enters " historical trend " picture by the tendency chart button clicked in navigation bar, contains in the picture
The data record of all important instrument and control parameter.Into after chart, provides in trend control and very easily look into
It askes and whether statistical function is checked mistake etc., carried out simply below for common function convenient for analysis system according to technological work
It introduces.It checks historical trend: clicking pause icon in the toolbar of tendency chart control and suspend tendency chart, then pass through click
Rewind icon is by tendency chart time shaft (horizontal axis) Page forward, and every to click once, time shaft inverts forward a full axis, and (default is set
It is set to twenty four hours), until the time shaft for being shown as needing to check.Or by clicking historical trend select button in X-axis
After the page is directly set and confirmed to time zone, trend in set time interval will be directly displayed in tendency chart.
Check time point data: the related data if you need to inquire some time point then clicks scale in the toolbar of tendency chart control
Then there are the black lines for being parallel to Y-axis, as scale in tendency chart in icon, and the scale is by mouse drag needed for
The time point of inquiry can show that all records are bent in tendency chart at the time point in the data control of picture lower half portion at this time
The data of line and time point, shown in the historical trend scale in check time interval statistical data: in the tool of tendency chart control
Scope of statistics button settings scope of statistics is clicked in column, occurs similar two black lines with scale in tendency chart at this time,
This two black draggings, to determine that the start time and terminal of scope of statistics, the lines on the left side are statistical time starting point, the right
Lines are end time.After guaranteeing that start time point is correct by dragging, the statistics button of tendency chart controls toolbar is clicked,
It can then show that maximum value of the trend record data in scope of statistics, minimum value are put down in the data control of picture lower half portion
Mean value and standard deviation carry out the analysis of history interval statistics；User realizes historical text by historical trend select button
Hiding and display function, into historical trend selection function.
User carries out report query by navigation bar, by clicking the selected report form type for needing to inquire of button.Work as user
It clicks " operating parameter daily sheet ", pops up operation data daily sheet query page, user inquires any one day by time control
History data, facilitate user carry out data daily sheet filing." operating parameter record queries " when the user clicks, pop-up
The operation data record queries page, user inquire the history data that minimum time interval is one minute by time control
Record in detail facilitates user to carry out data query analysis.User is drawn screen switching to " system setting " by navigation bar button
Bound range ability value, equipment delay time and the main control of all access instrument is mainly arranged in face in this screen
Parameter setting.The frequency conversion blower equipment figure for clicking required control in picture, will pop up corresponding frequency conversion blower equipment control
The control panel of panel processed, all frequency conversion blower equipments is all consistent, and control mode has: long-range starting (is manually controlling
Under, it is soft to manually boot)；It is long-range to stop (under manual control, soft manual stopping)；Automatically control (enter automatic control flow chart, by
Set control function determines start and stop)；Frequency gives (soft to start to give).If equipment breaks down, after checking equipment fault, point
Hit " ann reset " button in action pane.The valve arrangement figure for clicking required control in picture will pop up corresponding
Valve arrangement control panel, the control panel of all frequency conversion blower equipments is all consistent, and control mode has: long-range starting
(soft to manually boot, to be determined by frequency conversion air blower operating condition)；It is long-range to stop (soft manual stopping, by frequency conversion air blower operation work
Condition determines).If equipment breaks down, " ann reset " button after checking equipment fault, in clicking operation window.
System proposes the advanced fine tuning scheme of PID of Precise control to the control of frequency conversion blower frequency, by PID to being
The frequency parameter of system carries out dynamic adjustment, guarantees dissolved oxygen dynamic stability tracking fixed valure.Wherein adjusted back there are three PID frequency
Road: which pid loop DO Control PID, FLOW Control PID, DO serials control PID specifically use, and operator passes through in picture
" model selection " drop-down menu select realize.System shares eight DOPV selection modes: DOIT-01, DOIT-02, DOIT-
03, DOIT-04, minimum DO, average value DO, average value DOIT-01 and DOIT-02, average value DOIT-03 and DOIT-04, tool
Which DO value body uses, and operator selects to realize by " DO selection " drop-down menu in picture.In system interface this
Related data and parameter setting are checked and modified to the parameter setting of PID by clicking corresponding PID button in picture.Pid parameter
Setting, which adjusts user under normal circumstances with frequency, need not modify pid parameter, only need the SP setting value in modification " pid parameter " column
, which directly modifies also by system interface.User needs the operation frequency of specified water pump manually in special circumstances
Rate selects shaping modes to " manually controlling ", and is by " output MAN " specified running frequency in " output is set " column
It can.Pid parameter is the important parameter adjusted, and operator is the control theory and system performance for not knowing about control loop the case where
Under, do not allow to modify to pid parameter, control otherwise will be adjusted to system and generates significant impact, leads to unpredictable knot
Fruit.
System proposes the PID coarse adjustment scheme of dissolved oxygen Precise control to frequency conversion air blower unit number control, altogether there are two
PID unit number control circuit: D0 coarse adjustment unit number control PID, FLOW coarse adjustment unit number control PID is specifically controlled by which control loop
Depending on which kind of " mode " of current Systematic selection.The parameter setting of this PID is corresponding in picture by clicking in system interface
PID button check and modify related data and parameter setting.User need not under normal circumstances with frequency adjusting for pid parameter setting
Pid parameter is modified, only needs the SP setting value in modification " pid parameter " column, the setting value is also by straight in system interface
Connect modification.User needs the operation number of units of specified frequency conversion air blower manually in special circumstances, selects shaping modes to " control manually
System ", and by " output MAN " specified operation number of units (integer value) in " output setting " column, automatic mold is then put into again
Formula.Pid parameter is the important parameter adjusted, and operator is in the control theory for not knowing about control loop and the feelings of system performance
Under condition, do not allow to modify to pid parameter, control otherwise will be adjusted to system and generates significant impact, is caused unpredictable
As a result.
Before carrying out frequency conversion air blower break tour operation, the first step first confirms that the on-site control of four frequency conversion air blowers
Power transmission and whether " remotely knob on the spot " has been put into remote location, if the frequency conversion air blower is just in breakdown maintenance, it is necessary to will
The knob position of this frequency conversion air blower is put into regard to position, and carries out power operation.Confirm frequency conversion air blower investment " long-range ".
Second step, confirms whether four frequency conversion air blowers put into " automatic control " mode, if the frequency conversion air blower just in breakdown maintenance, must
This frequency conversion air blower must be put into " manually controlling " mode, and reject frequency conversion air blower running process.Confirm frequency conversion air blower
It puts into " automatic control ".Whether third step, the PID control that confirmation frequency conversion blower frequency is adjusted and number of units is adjusted put into " manually
Control " mode if it is not, come in enters to carry out the handover operation of control model in pid parameter panel, and confirms frequency conversion air blast board
Whether number MAN output is 1.0, if it is not, please modify.Confirm frequency conversion air blower investment " automatic control ".4th step, confirmation the
One step to third step operation it is correct after, please frequency conversion blower operation sequence, rearmost point in " selection of LEAD drop-down menu "
" break tour starts " button is hit, the break tour for completing frequency conversion air blower runs operation.Confirm frequency conversion air blower investment " automatic control ".The
Five steps, during break tour is run, LEAD drop-down menu selection function is shielded, if thinking the handover operation of progress LEAD break tour sequence,
" break tour terminates " button is please first clicked, a key shutdown operation of frequency conversion air blower is completed, after the stopping of all frequency conversion air blowers, weight
After new selection LEAD sequence, operated again according to the sequence of the first step to the 4th step.
It is specific as follows to inquire alarm logging step: the first step clicks " alarm logging " icon first on process flow chart,
Pop up alarm logging inquiry table；Second step, clicks " system log " icon in alarm logging inquiry table, and ejection system log is looked into
Ask table；Third step, clicks " defining user's screening " icon in system log inquiry table, and dialog box is arranged in pop-up querying condition；
4th step after time interval range is arranged in querying condition, clicks the alarm that specified time range can be inquired after applying.
Claims (3)
1. a kind of dissolved oxygen Precise control system, the control system at the beginning of four 55KW frequency conversion air blowers (1), one including precipitating
Pond (2), four dissolved oxygen ponds (3) and corresponding manifold pressure sensor (4), general pipeline air flow sensor (5), the dissolved oxygen pond
Two one group of settings are protruded into dissolved oxygen pond by pipeline respectively after frequency conversion air blower is in parallel, first sedimentation basin pass through pipeline respectively with
The dissolved oxygen pond of side connects, which is connected by the dissolved oxygen pond of pipeline and the other side；It is characterized in that, the frequency conversion drum
The pipeline that blower (1) parallel connection picks out is successively arranged manifold pressure sensor (4), general pipeline air flow sensor (5), and one end parallel connection picks out
Pipeline be equipped with blow valve, every group of dissolved oxygen pond is respectively equipped with binary channels DO dissolved oxygen sensor (6)；And by the PLC of PLC controller
Control system carries out overall intelligence linkage control, carries out following monitoring function to equipment instrument in the SCADA system of active station:
The start-up and shut-down control of frequency conversion air blower, it is remote/with regard to mode, operating status, malfunction, soft alarm, history accumulated running time, this
Accumulated running time, frequency be given, frequency feedback, the remote switch of blow valve, reach position, close in place, soft alarm, and
AFIT-01 air quantity real time data, APIT-01 pressure real time data, DO target given value, DOIT-01~DOIT-04 are counted in real time
According to the parameter monitoring of, DO alarm, air quantity target given value, air quantity alarm and pressure alarm；General pipeline air flow sensor (5) acquisition
AFIT-01 air quantity data, manifold pressure sensor (4) acquire APIT-01 pressure data；Binary channels DO dissolved oxygen sensor (6)
Acquire DOIT-01~DOIT-04 data；The PLC control system of the PLC controller includes two sets of frequency conversion air blowers of 55KW × 2
Intelligent controller and a set of PLC intelligent controller, PLC intelligent controller are equipped with touch screen；The active station uses Microsoft WIN7
32 Professional operating systems, and dissolved oxygen fining SCADA control system is installed；
The DO of the binary channels DO dissolved oxygen sensor (6) alarms are as follows: Gao Gao, high and low, low；General pipeline air flow sensor (5)
Air quantity alarm are as follows: low, low；The pressure alarm of manifold pressure sensor (4) are as follows: high, Gao Gao；Frequency conversion air blower (1) wheel
Class's control uses semi-automatic semi-manual mode, is realized by specified LEAD frequency conversion air blower；Specific implementation process are as follows: by specified
1# frequency conversion air blower, 2# frequency conversion air blower, 3# frequency conversion air blower, 4# frequency conversion air blower any one be LEAD frequency conversion air blower,
It determines the subsequent sequence of operation, then shares 24 kinds of LEAD selection modes according to permutation and combination:
1# frequency conversion air blower is LEAD frequency conversion air blower:
1# frequency conversion air blower → 2# frequency conversion air blower → 3# frequency conversion air blower
1# frequency conversion air blower → 3# frequency conversion air blower → 2# frequency conversion air blower
1# frequency conversion air blower → 4# frequency conversion air blower → 3# frequency conversion air blower
1# frequency conversion air blower → 3# frequency conversion air blower → 4# frequency conversion air blower
1# frequency conversion air blower → 2# frequency conversion air blower → 4# frequency conversion air blower
1# frequency conversion air blower → 4# frequency conversion air blower → 2# frequency conversion air blower
2# frequency conversion air blower is LEAD frequency conversion air blower:
2# frequency conversion air blower → 4# frequency conversion air blower → 3# frequency conversion air blower
2# frequency conversion air blower → 3# frequency conversion air blower → 4# frequency conversion air blower
2# frequency conversion air blower → 1# frequency conversion air blower → 3# frequency conversion air blower
2# frequency conversion air blower → 3# frequency conversion air blower → 1# frequency conversion air blower
2# frequency conversion air blower → 1# frequency conversion air blower → 4# frequency conversion air blower
2# frequency conversion air blower → 4# frequency conversion air blower → 1# frequency conversion air blower
3# frequency conversion air blower is LEAD frequency conversion air blower:
3# frequency conversion air blower → 1# frequency conversion air blower → 4# frequency conversion air blower
3# frequency conversion air blower → 4# frequency conversion air blower → 1# frequency conversion air blower
3# frequency conversion air blower → 1# frequency conversion air blower → 2# frequency conversion air blower
3# frequency conversion air blower → 2# frequency conversion air blower → 1# frequency conversion air blower
3# frequency conversion air blower → 4# frequency conversion air blower → 2# frequency conversion air blower
3# frequency conversion air blower → 2# frequency conversion air blower → 4# frequency conversion air blower
4# frequency conversion air blower is LEAD frequency conversion air blower:
4# frequency conversion air blower → 1# frequency conversion air blower → 2# frequency conversion air blower
4# frequency conversion air blower → 2# frequency conversion air blower → 1# frequency conversion air blower
4# frequency conversion air blower → 1# frequency conversion air blower → 3# frequency conversion air blower
4# frequency conversion air blower → 3# frequency conversion air blower → 1# frequency conversion air blower
4# frequency conversion air blower → 2# frequency conversion air blower → 3# frequency conversion air blower
4# frequency conversion air blower → 3# frequency conversion air blower → 2# frequency conversion air blower
It is respectively that " break tour starts ", " break tour terminates " and a LEAD drop-down choice box realize man-machine friendship that two buttons, which are arranged,
Mutual function, frequency conversion air blower will forbid LEAD pulldown function during running；When needing to be operated in shifts, click first "
Class terminates " button, linkage stops all frequency conversion air blowers being currently running at this time, and LEAD pulldown function menu will be activated, weight
New settings LEAD sequence carries out manual alignment to the runing time of four frequency conversion air blowers in practical operation in shifts；
Unit number control realization of the DO concentration Precise control coarse adjustment scheme by frequency conversion air blower, specific control method are as follows: First
Frequency conversion air blower is not able to satisfy frequency control and requires, and frequency reaches 50HZ, then second frequency conversion air blower is exported according to PID
Number of units value start the operation of second frequency conversion air blower, specify PID to export the operation since 50HZ at this time, control second frequency conversion
Air blower is run with frequency；If two frequency conversion air blowers, which reach 50HZ, is not still able to satisfy control requirement, third platform frequency conversion drum
The number of units value starting third platform frequency conversion air blower operation that blower is exported according to PID, specifies PID output to transport since 50HZ at this time
It calculates, control third platform frequency conversion air blower is run with frequency；
On the contrary, oxygen dissolving value is still higher if three frequency conversion air blowers are run in low-limit frequency, then the frequency conversion air blower basis that subtracts one
The number of units value of PID output stops the operation of third platform frequency conversion air blower, specifies PID to export the operation since low-limit frequency at this time,
Two frequency conversion air blowers are controlled to run with frequency；If two frequency conversion air blowers are run in low-limit frequency, oxygen dissolving value is still higher, then becomes
Frequency air blower, which subtracts one, stops the operation of second frequency conversion air blower according to the number of units value of PID output, specify at this time PID output from
Low-limit frequency starts operation；But in any case, it is necessary to assure there is a frequency conversion fan running always, and frequency converter is most low
Frequency limit rate can guarantee that frequency conversion blower export pressure is enough to overcome the water resistance of end, it is ensured that frequency conversion air blower not stall；Wherein,
Since number of units is integer value, practical floating number rounds up and exports after operation；
DO concentration Precise control fine tuning scheme is intelligently adjusted by the frequency converter of frequency conversion air blower (1) and is realized, is mentioned in operation screen
Panel is adjusted for pid parameter, realizes that minimum operating frequency and maximum running frequency are set, frequency converter frequency is exported according to DO concentration
Realize that PID closed loop is intelligently adjusted, and is calculated by the compound two close cycles intelligentized control method of accurate adjustment and coarse adjustment compared with DO concentration target value
Method finally realizes that DO precision adjusts target.
2. dissolved oxygen Precise control system as described in claim 1, which is characterized in that the frequency conversion air blower (1) with put
Empty valve linkage: when starting First frequency conversion air blower, being first turned on blow valve, after blow valve reaches position, postpones certain time
Afterwards, blow valve is closed, when starting more than two frequency conversion air blowers, closes blow valve always, prevents air quantity emptying discharge；Stop institute
When having frequency conversion air blower, it is first turned on blow valve, after blow valve reaches position, delay after a certain period of time, closes frequency conversion air blower,
As long as frequency conversion air blower closed state, corresponding blow valve will automatically turn on.
3. dissolved oxygen Precise control system as described in claim 1, which is characterized in that the event of the frequency conversion air blower (1)
It is acted when barrier: when the frequency conversion air blower being currently running, which breaks down, shuts down, other standby variable frequency air blower automatic runnings, it is ensured that
Dissolved oxygen precision control requires.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610988833.2A CN106527332B (en) | 2016-11-05 | 2016-11-05 | Dissolved oxygen Precise control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610988833.2A CN106527332B (en) | 2016-11-05 | 2016-11-05 | Dissolved oxygen Precise control system |
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| CN106527332A CN106527332A (en) | 2017-03-22 |
| CN106527332B true CN106527332B (en) | 2019-06-04 |
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| JPS6171895A (en) * | 1984-09-13 | 1986-04-12 | Toyota Motor Corp | Controlling method of dissolved oxygen in aerat8ion tank |
| CN100445221C (en) * | 2006-11-21 | 2008-12-24 | 北京工业大学 | Dissolved oxygen control device of Orbal oxidation ditch biological denitrification process and its method |
| CN201016100Y (en) * | 2007-02-06 | 2008-02-06 | 北京工业大学 | Subsection water feeding A/O technique oxygen dissolving and carbon source addition fuzzy control device |
| CN101306871B (en) * | 2008-06-06 | 2010-12-01 | 北京工业大学 | Oxygen supplying, energy-conserving and optimizing control method by SBR process and device thereof |
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