CN103058359A - Integral controller applied to aeration tank for sewage treatment - Google Patents
Integral controller applied to aeration tank for sewage treatment Download PDFInfo
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- CN103058359A CN103058359A CN2013100343416A CN201310034341A CN103058359A CN 103058359 A CN103058359 A CN 103058359A CN 2013100343416 A CN2013100343416 A CN 2013100343416A CN 201310034341 A CN201310034341 A CN 201310034341A CN 103058359 A CN103058359 A CN 103058359A
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- 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
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The invention discloses an integral controller applied to an aeration tank for sewage treatment. The integral controller comprises a central processor and an analog input circuit, an on-off input circuit, a dissolved oxygen control output circuit, a backwash control output circuit, a communication module, a parameter setting key, a keyboard, a display module, a remote fault alarm circuit, a temperature and humidity data acquisition circuit, a calendar clock module, a network interface circuit, an SD card storage module and a power supply module. The integral controller disclosed by the invention realizes control on dissolved oxygen of a blower by a combination mode of relative input parameters such as dissolvent oxygen content, oxidized reduction potential, mixed liquid suspended solid, suspended solid, water temperature, pipeline pressure, air flow rate and the like, simultaneously realizes intelligent control on backwash, and organically combines the two control processes to optimize the treatment, thereby really fulfilling the aims of ensuring water quality and fully saving energy, and the integral controller not only has the characteristics of quite low cost, strong function, high energy conservation and easiness in popularization, but also is convenient to install and debug.
Description
Technical field
The present invention relates to a kind of control device, specifically a kind of integrated controller that is applied to sewage treatment aeration tank.
Background technology
The oxygen consumption reaction is the important step of reaction in sewage biochemical treatment aeration tank.The oxygenation work of present domestic sewage biochemical treatment aeration tank all is to adopt powerful gas blower to realize, needs to consume a large amount of electric energy.In the situation that guarantees water quality, how to realize Energy Saving Control, reduce cost, be the problem that need to think better of both at home and abroad at present.Microorganism in the sewage is certain to the demand of oxygen, has lacked and can reduce water quality, many not only can not guarantee water quality, but also wastes energy, and the content with dissolved oxygen decides oxygen-supplying amount usually.But the needed dissolved oxygen in aeration tank is not a definite value, and it is the function that changes concentration, weather, time along with sewage; That is to say that sewage treatment process control has the significantly characteristics of non-linear, large time delay, multivariate, time variation.For this reason, need research under different working conditions, the model of the dissolved oxygen variation of biochemical processing procedure of sewage is set up in the optimal control of dissolved oxygen set(ting)value, and according to this model blast volume is carried out the optimal control of less energy-consumption, foundation can conform change based on the sewage biological process.
In like manner, BAF is a kind of sewage treatment technique that grows up on the conventional rapid filter basis.This technique integrates physics cut-off filter, biological adsorption, oxidation, is developed fast aspect advanced treatment of wastewater.But its applicable cases shows: BAF is after operation for some time, biological particles and abiotic particle in filling surface and the filter bed space constantly accumulate, the aquaporin of crossing in filter tank reduces, head loss in the filter tank increases, the water outlet water yield reduces, " penetrating " phenomenon occurs, thereby make the effluent quality variation, " vent plug " phenomenon also may appear when the air water antikinesis, affected the stability of BAF operation, this just need to carry out back flushing to recover its normal water purification function to the filter tank.Determining of the backwash mode in filter tank and parameter is the focus that people pay close attention to always.But the viewpoint that the research of the aspects such as present theoretical model about back flushing, back flushing mechanism is not agreed.BAF is utilized traditional high flow rate backwash mode because the biomembranous growth of viscosity, and not only water loss is large and be difficult to get a desired effect, and is restricted in practical application.The combined water and air backwash mode has been strengthened the shearing of filler and impact effect, filtering layer is under the top condition recoils, and can save the backwash water amount, prolongs backwashing period, increases the water environment capacity in filter tank, improves effluent quality.
This shows that the treatment process more complicated of aeration tank need comparatively complicated algorithm, and good algorithm also is subjected to the restriction of hardware in implementation process.Utilize general programmable logic controller PLC to be difficult to realize, just not saying a little less than the PLC computing power, be difficult to realize the complicated approach such as expert systems, BP neural network, hardware platform also is difficult to realize unified.Because the corresponding relation of hardware must with software always, do change in the system of having set up, very expensive; Can realize the algorithm that some are complicated with Industrial Control Computer, but also need the hardware interface platform.
Operation according to domestic existing sewage work is found, the automatic equipment of Sewage treatment systems drops into lower, energy consumption is high, and Sewage treatment systems fails to reach the design and operation requirement mostly when going into operation, or after operation for some time, change part automatic, partially manual running status, particularly aerating system into.Analyze reason and mainly contain the following aspects:
1, automatic technology and Technology fail to organically combine.Wastewater treatment in China factory when starting, automated sewage treatment system package import external product and technology, although later on domesticly can produce hardware system, control techniques is not by the absorption of system.The Automation Specialty strength of domestic sewage treatment industry is lower, the automation system of a lot of sewage treatment projects of building is by the domain engineers such as metallurgy, chemical industry, light industry design, programming and debugging, understand less to sewage treatment process, can not carry out the control strategy design in conjunction with concrete technology, the general way of applying mechanically other industry prior art that adopts, therefore, operating performance is unsatisfactory.
2, the robot control system(RCS) training is not in place.A lot of operations staffs of sewage work do not have the system training of controlled systems provider producer, except elementary operation, not theoretically to such as the telling about in detail of aerating system regulation technology, so that managerial personnel can only grope at work again.
3, service experience does not obtain utilizing.Sewage work's the very important point is after long-time running, can sum up daily rule, obtains control program; For the manager, these rules are often more valuable than the robot of costliness, but in construction of wastewater treatment plant, a lot of designs not leave sufficient adjustment space to the manager, and these useful experiences also lack the construction approach that is applied to other wastewater treatment facility.
4, the difficult point of dissolved oxygen control.The complicacy of the changeable and biological treatment system mesophytization reaction of sewage quality, dissolved oxygen (DO) the detection control that has determined sewage disposal is a Large-lag System, detect the result and carry out again parameter processing and adjustment, often lag behind long time, cause the discharge of a large amount of defective water.The characteristics of this system are that the operational management of sewage biological treatment system has suitable technical difficulty, require the manager to have preferably environmental engineering Knowledge Base and quite abundant operational management experience.In addition, the dissolved oxygen index can not directly reflect the oxygen demand of biological respinse, and it has just reflected the residue degree of oxygen in the reaction tank, can't directly calculate tolerance according to its numerical value and variation.Although traditional pid control algorithm extensively adopts, can only solve the adjusting problem of linear system on engineering.
5, from the controlling run angle of whole system, its immediate cause of the control of aeration rate also has many aspects.1, hardware reason: the gas control system of now plant area's employing mostly is butterfly valve or gate valve comes the Controlling System flow, and butterfly valve or the more accurate scope of the control of gate valve are generally all below 70%; Surpassing 70% is nonlinear Control, and the control difficulty is strengthened; The DO detection instrument that adopts, installation site and fitting depth all without unified standard, cause data acquisition point inaccurate; On measuring method, the probe of embrane method is aging easily, causes the mensuration of data to have deviation.2, software reason: the control module of current trend, what producer's majority relied on is that the DO value is as control data foundations, in the middle of operation, because system's (control parameter) in each season needs to be adjusted to the environment of system that adapts, but the reference mark of these class data is not can accumulate the short period of time to finish; In the middle of operation, owing to the water yield, water quality etc. are all changing, under the data of a large amount of changes, find its reference mark difficult.
Comprehensive, as follows to the control of aeration tank both at home and abroad:
One, domestic situation:
1, manual operation: the field staff is to aeration tank dissolved oxygen control employing on-off mode.Open when needing, wind speed is controlled with the blower fan valve basically; And backwash process also is that operator are according to the aeration tank soil conditions or regularly carry out washing with G﹠W.
2, aeration control adopts the PLC+ simulation to set up Controlling System, carries out PID control according to the content of aeration tank oxygen.Tsing-Hua University invented (patent No.: the 200810100805.8) patent of " a kind of urban sewage plant aeration tank dissolved oxygen stable intelligent control method and device thereof ", realize exactly the control of dissolved oxygen with PLC; The dissolved oxygen index can not directly reflect the oxygen demand of biological respinse, and it has just reflected the residue degree of oxygen in the reaction tank, can't directly calculate tolerance according to its numerical value and variation.PID can realize the control to flow in the aerating system, but limited to the controllability of water treatment effect.During dissolved oxygen (DO) control, adjusting of pid parameter need to constantly be adjusted according to the practical situation such as variation of season, water quality.White clouds Automation Co., Ltd of Guangdong Toshiba aspect invented the (patent No.: 201010118387.2) patent " control algolithm of sewage lagoon dissolved oxygen ", this patent neural network algorithm, its algorithm is complicated, be difficult in the PLC system, realize, can only move at Industrial Control Computer at present, and hardware needs unified.And designing the integrated controller of realization, the application can be easy to realize this control algolithm.
Two, abroad instance
The VACOMASS system is the cover sewage work biological tank accurate aeration control system by the exploitation of German Binder company,
Its system comprises built-in control algolithm, system software, Local Controller and laboratory simulation verification; Be widely applied in Europe.As control signal, dissolved oxygen and ammonia nitrogen signal can provide gas delivery volume according to the load of reality as auxiliary control signal with the gas flow signal in this system; The gas flow control loop is control loop on the spot, can be quickly and accurately provide gas delivery volume according to the load of reality, every part of biological reaction tank can both be reached efficiently, stablize, and according to the size of actual loading situation Self-adjustment set(ting)value, control valve adopts rhombus, and the whole control accuracy of aeration control system is up to 5%.This system is mainly used to dissolved oxygen control, and cost is higher, needs the full-time technician who does could adjust calibration during use; The peripherals cost is also higher., be difficult for accepting because use cost is very high in some small-scale sewage aeration tanks.External back flushing is controlled based on the structure situation of aeration tank and is decided, and its control form is included in the large-scale sewage treatment control system, so promote at home certain limit is arranged.
Based on this, the controller that needs a kind of aeration tank dissolved oxygen of development and back flushing one, the controller of this controller collection dissolved oxygen control and back flushing control one, the control program of concrete various modes, be applicable to large Miniature Sewage Farm, also be convenient to the system reform and upgrading.
Summary of the invention
The deficiency that exists for overcoming above-mentioned prior art, the invention provides a kind of integrated controller that is applied to sewage treatment aeration tank, it not only collects dissolved oxygen control and is controlled in one with back flushing, and the control program of concrete various modes, is convenient to transformation and the upgrading of system.
The present invention solves the technical scheme that its technical problem takes: a kind of integrated controller that is applied to sewage treatment aeration tank, it is characterized in that, comprise central processing unit and the simulated measurement input circuit that is connected with central processing unit respectively, switching value input circuit, dissolved oxygen control output circuit, back flushing control output circuit, communication module, parameter setting button, keyboard, display module and power module; Described simulated measurement input circuit comprises analogue signal acquisition circuit, amplifying circuit, zero point correction circuit, A/D change-over circuit and the first magnetic coupling buffer circuit, described A/D change-over circuit is connected with central processing unit by the first magnetic coupling buffer circuit, and described analogue signal acquisition circuit, amplifying circuit and zero point correction circuit are connected with the A/D change-over circuit and are connected; Described switching value input circuit comprises I/O input circuit and the first photoelectric isolating circuit, and described I/O input circuit is connected with central processing unit by the first photoelectric isolating circuit; Described dissolved oxygen control output circuit comprises analog quantity dissolved oxygen output control circuit and switching value dissolved oxygen output control circuit; Described back flushing control output circuit comprises analog quantity back flushing control output circuit and switching value back flushing control output circuit; Described communication module comprises Intelligent communication module, main RS485 interface circuit, from RS485 interface circuit, the 4th magnetic coupling buffer circuit and the 5th magnetic coupling buffer circuit, described Intelligent communication module is connected with central controller, described main RS485 interface circuit is connected with Intelligent communication module by the 4th magnetic coupling buffer circuit, describedly passes through the 5th magnetic coupling buffer circuit from the RS485 interface circuit and is connected with central controller.
Preferably, described analog quantity dissolved oxygen output control circuit comprises the second magnetic coupling buffer circuit, a D/A change-over circuit and 4-20mA electric current dissolved oxygen control output circuit, the input terminus of a described D/A change-over circuit is connected with central processing unit by the second magnetic coupling buffer circuit, and output terminal is connected with 4-20mA electric current dissolved oxygen control output circuit;
Described switching value dissolved oxygen output control circuit comprises the second photoelectric isolating circuit, outputting circuit for relay and dissolved oxygen control I/O output circuit, and described outputting circuit for relay is connected the I/O output circuit and is connected with central processing unit by the second photoelectric isolating circuit respectively with dissolved oxygen.
Preferably, described analog quantity back flushing control output circuit comprises that three magnetic coupling buffer circuits, the 2nd D/A change-over circuit and 4-20mA inverse current impulse wash the control output circuit, the input terminus of described the 2nd D/A change-over circuit is connected with central processing unit by the 3rd magnetic coupling buffer circuit, and output terminal is washed the control output circuit with the 4-20mA inverse current impulse and is connected;
Described switching value back flushing control output circuit comprises the 3rd photoelectric isolating circuit, transistor output circuit and back flushing control I/O output circuit, and described transistor output circuit is connected the I/O output circuit and is connected with central processing unit by the 3rd photoelectric isolating circuit respectively with back flushing.
Preferably, central processing unit described above adopts technical grade STM32F micro-chip.
Further, described integrated controller also comprises fault remote alarms circuit, and described fault remote alarms circuit is connected with central processing unit by the 4th photoelectric isolating circuit.
Further, described integrated controller also comprises the humiture data acquisition circuit, and described humiture data acquisition circuit is connected with central processing unit.
Further, described integrated controller also comprises the calendar clock module, and described calendar clock module is connected with central processing unit.
Further, described integrated controller also comprises network interface circuit, and described network interface circuit is connected with central processing unit.
Further, described integrated controller also comprises SD card memory module, and described SD card memory module is connected with central processing unit.
The invention has the beneficial effects as follows, the control core of integrated controller of the present invention adopts the technical grade STM32F micro-chip of ST series, one or more combination form according to relevant input parameters such as dissolved oxygen content, redox potential, mixed liquor suspended solid, MLSS, suspended solid, water temperature, pipeline pressure, air flow quantitys is carried out the control of gas blower dissolved oxygen, and master mode can be by the screen setting; These input parameters can obtain by analog quantity or Intelligent communication module method, also can obtain by upper computer, and the method that need to obtain can be by the screen setting; Simultaneously, described integrated controller also can be realized according to the opacity in time or the muddy instrument detection cell intelligent control of back flushing, and master mode also can arrange.Integrated controller of the present invention organically combines two kinds of control processs, assurance water quality has really been played in optimization process, reaches fully energy-conservation purpose, have not only that cost is extremely low, function is strong, high energy-conservation and easy universal characteristics, and is convenient to installment and debugging.
Description of drawings
The present invention is further described below in conjunction with accompanying drawing:
Fig. 1 is structural representation of the present invention;
Fig. 2 is of the present invention one concrete application principle figure.
Embodiment
As shown in Figure 1, a kind of integrated controller that is applied to sewage treatment aeration tank of the present invention, it comprises central processing unit and the simulated measurement input circuit that is connected with central processing unit respectively, switching value input circuit, dissolved oxygen control output circuit, back flushing control output circuit, communication module, parameter setting button, keyboard, display module, fault remote alarms circuit, humiture data acquisition circuit, calendar clock module, network interface circuit, SD card memory module and power module.Described central processing unit adopts technical grade STM32F micro-chip; Described simulated measurement input circuit comprises analogue signal acquisition circuit, amplifying circuit, zero point correction circuit, A/D change-over circuit and the first magnetic coupling buffer circuit, described A/D change-over circuit is connected with the STM32F micro-chip by the first magnetic coupling buffer circuit, and described analogue signal acquisition circuit, amplifying circuit and zero point correction circuit are connected with the A/D change-over circuit and are connected; Described switching value input circuit comprises I/O input circuit and the first photoelectric isolating circuit, and described I/O input circuit is connected with the STM32F micro-chip by the first photoelectric isolating circuit; Described dissolved oxygen control output circuit comprises analog quantity dissolved oxygen output control circuit and switching value dissolved oxygen output control circuit; Described back flushing control output circuit comprises analog quantity back flushing control output circuit and switching value back flushing control output circuit; Described communication module comprises Intelligent communication module, main RS485 interface circuit, from RS485 interface circuit, the 4th magnetic coupling buffer circuit and the 5th magnetic coupling buffer circuit, described Intelligent communication module is connected with the STM32F micro-chip, described main RS485 interface circuit is connected with Intelligent communication module by the 4th magnetic coupling buffer circuit, describedly passes through the 5th magnetic coupling buffer circuit from the RS485 interface circuit and is connected with the STM32F micro-chip.
Analog quantity dissolved oxygen output control circuit described above comprises the second magnetic coupling buffer circuit, a D/A change-over circuit and 4-20mA electric current dissolved oxygen control output circuit, the input terminus of a described D/A change-over circuit is connected with the STM32F micro-chip by the second magnetic coupling buffer circuit, and output terminal is connected with 4-20mA electric current dissolved oxygen control output circuit.
Switching value dissolved oxygen output control circuit described above comprises the second photoelectric isolating circuit, outputting circuit for relay and dissolved oxygen control I/O output circuit, and described outputting circuit for relay is connected the I/O output circuit and is connected with the STM32F micro-chip by the second photoelectric isolating circuit respectively with dissolved oxygen.
Analog quantity back flushing described above control output circuit comprises that three magnetic coupling buffer circuits, the 2nd D/A change-over circuit and 4-20mA inverse current impulse wash the control output circuit, the input terminus of described the 2nd D/A change-over circuit is connected with the STM32F micro-chip by the 3rd magnetic coupling buffer circuit, and output terminal is washed the control output circuit with the 4-20mA inverse current impulse and is connected.
Switching value back flushing control output circuit described above comprises the 3rd photoelectric isolating circuit, transistor output circuit and back flushing control I/O output circuit, and described transistor output circuit is connected the I/O output circuit and is connected with the STM32F micro-chip by the 3rd photoelectric isolating circuit respectively with back flushing.
Describe the specific works principle of integrated controller of the present invention in detail below in conjunction with Fig. 1:
1, casing design
Integrated controller casing of the present invention can be made with the aluminium alloy punching press, is fit to outdoor mounted, water proof and dust proof.
2, Power Management Design
The supplying unit employing is inputted with the wide voltage that exchanges 85～265V based on the single-ended flyback dual output switch power supply design of TOP246, realization direct current 12V/0.5A, ± 24V three Voltage-outputs.Power supply is pressed EMC, EMI standard design.Back flushing control output voltage external power source, power range DC:0-100V.
3, importation
The importation comprises instrument signal input channel, water temperature input channel, zero point correction, switching value input channel, digital outside atmosphere parameter input channel and keyboard input.
(1), the signal input parameters such as the aeration tank liquid level that needs of the instrument signal dissolved oxygen content, redox voltage, mixed liquor suspended solid, MLSS, suspended solid, water temperature, pipeline pressure, air flow quantity and the back flushing that mainly contain dissolved oxygen control and need, muddy instrument, such instrument generally all has the output signal of 4-20mA or 0-5V.Signal becomes each road analog value after A/D chip TCL2543 conversion scale conversion.TCL2543 has 11 tunnel inputs, and wherein one the tunnel is zero point correction.
(2), the water temperature of aeration tank detects with PT100, wave circuit, instrument amplifier AD620, A/D conversion obtain the temperature of sewage aeration Chi Shui after filtration.
(3), the input of the switching value of 4 road band hysteresis, as cue or the cascade signal at the same level of upper computer, when the aeration tank is divided into more greatly several district, can adopt simultaneously several controllers, can realize the cascade of several controllers with input/output interface.For weather condition being recorded and controls upper reference, this controller is measured temperature, humidity and the dew point of air with Digital temperature ﹠ humidity sensor SHT11.
(4), 6 parameter settings are set by key, implementation pattern, parameter and function setting.
4, output channel
Output channel comprises: the control output of dissolved oxygen, the control of back flushing, fault alarm output and four kinds of situations of liquid-crystal display
(1), the control of the switch of gas blower and blower fan valve is exported by the 4-20mA variable frequency control in dissolved oxygen control.When not using frequency transformer, then available 4 road Control motors are opened, and 2 road I/O mouths carry out the unlatching of blower fan and valve.This controller comes the aperture of variable valve by timing, and the feedback mechanism that saves valve is in order to save cost, also to be convenient to old effluent control system is transformed; Facts have proved in the precision impact not quite, as long as to a reasonable orientation.
(2), back flushing controls also by the 4-20mA variable frequency control, according to circumstances use at the scene.For realizing that energy-conservation many producers adopt frequency transformer to come the controller gas circuit; For satisfying the voltage of different valves, this controller adopts the Darlington high power transistor to export, and controls blower fan unlatching, blower fan valve, water intaking valve, outlet valve, water discharge valve, vent valve, inflation valve.1 road I/O output is as the aperture of blower fan valve, and aperture is regulated by time length.
(3) fault alarm is that this controller is reported to the police when fault is arranged, and two kinds of control fault alarms are distinguished with alternative sounds.
(4) but, liquid-crystal display is display instrument parameter, control mode etc., can carry out the setting of series of parameters.
5, control core
Central processing unit of the present invention adopts the technical grade STM32F107VCT6 micro-chip of ST series.This chip is 32 8-digit microcontrollers of ARM Cortex-M3 kernel.This treater has extremely strong immunity from interference, wide voltage 2-3.5V use range, hardware integration the multiplication and division algorithms, be convenient to carry out complicated float-point arithmetic.The STM32F107VCT6 micro-chip has 100 pins, and 16 road PWM export, and has satisfied the needs of instrument, and 5 USART interfaces are arranged, and has increased Ethernet 10/100MAC module, for network communication lays the first stone.The external SD card storage of controller relevant data, maximum can expand to 2GB, and each pre-set parameter is placed on E
2In the PROM24C02 storer; Increased simultaneously clock chip RX8025, the record backwashing time.RX8025 is a kind of employing I that Epson (EPSON) company produces
2The real-time timepiece chip of C EBI, working stability is reliable, and immunity from interference is strong; For satisfying the control net system needs, this temperature controller has designed the Ethernet interface.The inner integrated MAC control module of this STM32F microcontroller meets the IEEE802.3 agreement, and the outside connects the control that the DP83848 chip is easy to realize Ethernet; And ST company provides some relevant drivers of MAC, and this just provides very large convenience for our exploitation.In addition, control core is isolated with outside magnetic coupling and the photoelectricity of adopting, and has effectively prevented electromagnetic interference.
6, Intelligent communication module
Described Intelligent communication module can carry out communication with the correlate meter that sewage disposal is adopted as the main communication port of controller.Along with the development of field bus control system, correlate meter and upper computer that sewage disposal is adopted adopt RS485 or network communication substantially later on.This controller has this function, can communication be set by upper computer and open, and the control core of its intelligent object adopts the STM8S micro-chip of ST series, can connect 10 instrument with communication port of RS485 agreement, fixes order and the address of instrument.This module can arbitrarily be changed the communications protocol of the instrument that links to each other with integrated controller, will change good module, inserts mainboard and gets final product.Because the sewage disposal of production aeration tank adopts the producer of instrument more, the agreement disunity uses for reaching unified, makes things convenient for the user, and we write the agreement of several frequently seen instrument in advance, download to module according to customer need when needing and get final product.
7, RS485 PORT COM
Controller another one RS485 is as having from communication port, can with upper computer or PLC communication communication.If want to transform in former Controlling System, obtain the parameter of all kinds of instrument on the Industrial Control Computer that then can be equipped with by original system or the PLC.The unlatching of this function can be by screen and button setting.
Fig. 2 is of the present invention one concrete application principle figure.As shown in Figure 2, the present invention is applied to the specific embodiments of aeration tank:
This implementation connects instrument, sensor and other control circuit according to processing requirement according to mark.
Integrated controller can be transformed in original Controlling System, also can use for newly-built Sewage treatment systems.Controller is decided as the case may be with the on-the-spot connection modes such as instrument.Three kinds of modes of employing of obtaining of instrumented data among Fig. 2: 1) analog input; 2) intelligent control communication; 3) upper computer.The user determines that the instrumented data obtain manner gets final product when ordering goods in the time of the old system reform of needs or change instrument producer.Intelligent communication module can arbitrarily be changed, and module is strictly corresponding with the instrument kind.Master mode of the present invention sets relevant parameters and master mode based on the instrument kind that connects by screen.The Electric Appliance Cabinet of integrated controller mainly plays the conveying of conventional power current, the effects such as intermediate relay is chain, Frequency Converter Control.
The general modfel of dissolved oxygen control of the present invention is the flow that content, redox potential instrument, the pipeline pressure according to dissolved oxygen controlled pipeline air.Back flushing of the present invention control generally is to realize flushing process according to time or muddy instrument set(ting)value or overall target, and flushing process is generally draining, gas flushing, air-water mixture, water flushing and water inlet double teacher.Each stage running time of back flushing presets according to the filter tank operating mode and decides.The basic control mode of this controller back flushing is: at first enter bleeding stage, close first water intaking valve, the water level of filter tank (or aeration tank) is down to presets water level, then close outlet valve, open water discharge valve; After water discharge valve is opened, filter tank (or aeration tank) enters the gas flushing stage, at this moment gas rushes timing register and begins timing, vent valve is opened, blower fan starting (with the fan starting frequency transformer of Frequency Converter Control), fan outlet valve are opened simultaneously, and aperture is fixed by opening time length, after blower fan enters running status, open gas and rush valve, close simultaneously vent valve; After the gas flushing time reached preset value, mixing wastewater with air was washed meter beginning timing, and the recoil water valve is opened, simultaneously starting recoil water pump, and the pump discharge valve of fetching boiling water, filter tank (or aeration tank) enters mixing wastewater with air back flushing state.After the mixing wastewater with air backwashing time reaches preset value, washing beginning timing, the recoil air valve is closed, autoshutdown behind the open air valve (purging valve leaves), emptying airduct residual air, simultaneously blowing-out machine, close the blower fan air outlet valve, filter tank (or aeration tank) enters water flushing state; After washing time reaches preset value, close the recoil water valve, stop simultaneously the water pump that recoils, the outlet valve that switches off the pump cuts out water discharge valve at last, opens water intaking valve, filter tank (or aeration tank) enters into the water state, when water level rose to the constant water level filtering position, automatic backwash was finished, and changed normal filter over to.The back flushing master mode is a lot, sets in advance several master modes and select for applying unit in this controller.
The above is preferred implementation of the present invention, for those skilled in the art, under the prerequisite that does not break away from the principle of the invention, can also make some improvements and modifications, and these improvements and modifications also are regarded as protection scope of the present invention.
Claims (9)
1. integrated controller that is applied to sewage treatment aeration tank, it is characterized in that, comprise central processing unit and the simulated measurement input circuit that is connected with central processing unit respectively, switching value input circuit, dissolved oxygen control output circuit, back flushing control output circuit, communication module, parameter setting button, keyboard, display module and power module; Described simulated measurement input circuit comprises analogue signal acquisition circuit, amplifying circuit, zero point correction circuit, A/D change-over circuit and the first magnetic coupling buffer circuit, described A/D change-over circuit is connected with central processing unit by the first magnetic coupling buffer circuit, and described analogue signal acquisition circuit, amplifying circuit and zero point correction circuit are connected with the A/D change-over circuit and are connected; Described switching value input circuit comprises I/O input circuit and the first photoelectric isolating circuit, and described I/O input circuit is connected with central processing unit by the first photoelectric isolating circuit; Described dissolved oxygen control output circuit comprises analog quantity dissolved oxygen output control circuit and switching value dissolved oxygen output control circuit; Described back flushing control output circuit comprises analog quantity back flushing control output circuit and switching value back flushing control output circuit; Described communication module comprises Intelligent communication module, main RS485 interface circuit, from RS485 interface circuit, the 4th magnetic coupling buffer circuit and the 5th magnetic coupling buffer circuit, described Intelligent communication module is connected with central controller, described main RS485 interface circuit is connected with Intelligent communication module by the 4th magnetic coupling buffer circuit, describedly passes through the 5th magnetic coupling buffer circuit from the RS485 interface circuit and is connected with central controller.
2. a kind of integrated controller that is applied to sewage treatment aeration tank according to claim 1, it is characterized in that, described analog quantity dissolved oxygen output control circuit comprises the second magnetic coupling buffer circuit, a D/A change-over circuit and 4-20mA electric current dissolved oxygen control output circuit, the input terminus of a described D/A change-over circuit is connected with central processing unit by the second magnetic coupling buffer circuit, and output terminal is connected with 4-20mA electric current dissolved oxygen control output circuit;
Described switching value dissolved oxygen output control circuit comprises the second photoelectric isolating circuit, outputting circuit for relay and dissolved oxygen control I/O output circuit, and described outputting circuit for relay is connected the I/O output circuit and is connected with central processing unit by the second photoelectric isolating circuit respectively with dissolved oxygen.
3. a kind of integrated controller that is applied to sewage treatment aeration tank according to claim 1, it is characterized in that, described analog quantity back flushing control output circuit comprises that three magnetic coupling buffer circuits, the 2nd D/A change-over circuit and 4-20mA inverse current impulse wash the control output circuit, the input terminus of described the 2nd D/A change-over circuit is connected with central processing unit by the 3rd magnetic coupling buffer circuit, and output terminal is washed the control output circuit with the 4-20mA inverse current impulse and is connected;
Described switching value back flushing control output circuit comprises the 3rd photoelectric isolating circuit, transistor output circuit and back flushing control I/O output circuit, and described transistor output circuit is connected the I/O output circuit and is connected with central processing unit by the 3rd photoelectric isolating circuit respectively with back flushing.
4. according to claim 1 and 2 or 3 described a kind of integrated controllers that are applied to sewage treatment aeration tank, it is characterized in that described central processing unit adopts technical grade STM32F micro-chip.
5. according to claim 1 and 2 or 3 described a kind of integrated controllers that are applied to sewage treatment aeration tank, it is characterized in that, also comprise fault remote alarms circuit, described fault remote alarms circuit is connected with central processing unit by the 4th photoelectric isolating circuit.
6. according to claim 1 and 2 or 3 described a kind of integrated controllers that are applied to sewage treatment aeration tank, it is characterized in that also comprise the humiture data acquisition circuit, described humiture data acquisition circuit is connected with central processing unit.
7. according to claim 1 and 2 or 3 described a kind of integrated controllers that are applied to sewage treatment aeration tank, it is characterized in that also comprise the calendar clock module, described calendar clock module is connected with central processing unit.
8. according to claim 1 and 2 or 3 described a kind of integrated controllers that are applied to sewage treatment aeration tank, it is characterized in that also comprise network interface circuit, described network interface circuit is connected with central processing unit.
9. according to claim 1 and 2 or 3 described a kind of integrated controllers that are applied to sewage treatment aeration tank, it is characterized in that also comprise SD card memory module, described SD card memory module is connected with central processing unit.
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| CN103613189A (en) * | 2013-12-10 | 2014-03-05 | 济南大学 | Universal intelligent back wash controller of biological aerated filter |
| CN105988402A (en) * | 2015-03-23 | 2016-10-05 | 费希尔控制产品国际有限公司 | Integrated process controller with loop and valve control capability |
| CN106886184A (en) * | 2017-04-11 | 2017-06-23 | 重庆文理学院 | Adaptive power conservation municipal sewage exports monitoring system and method |
| CN107032486A (en) * | 2017-05-31 | 2017-08-11 | 桂林理工大学 | The Inlet and outlet water measurement and control system of up-flow anaerobic biofilter |
| CN107728511A (en) * | 2017-09-14 | 2018-02-23 | 江苏大学 | A kind of monitoring system of the organic water pollution decomposition apparatus of Hydrodynamic cavitation |
| CN109634314A (en) * | 2019-01-11 | 2019-04-16 | 中铁隧道集团二处有限公司 | Intelligent water level measure and control device |
| CN112783080A (en) * | 2020-12-30 | 2021-05-11 | 上海远动科技有限公司 | Automatic control method for advanced treatment of water plant |
| WO2021087893A1 (en) * | 2019-11-07 | 2021-05-14 | 云南合续环境科技有限公司 | Combinational logic control circuit, and waste water treatment system |
| CN112915641A (en) * | 2021-03-18 | 2021-06-08 | 上海威派格智慧水务股份有限公司 | Filter tank backwashing control method |
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| CN112783080A (en) * | 2020-12-30 | 2021-05-11 | 上海远动科技有限公司 | Automatic control method for advanced treatment of water plant |
| CN112915641A (en) * | 2021-03-18 | 2021-06-08 | 上海威派格智慧水务股份有限公司 | Filter tank backwashing control method |
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