CN103984367A - Automatic air flotation filtering tank liquid level control system - Google Patents
Automatic air flotation filtering tank liquid level control system Download PDFInfo
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- CN103984367A CN103984367A CN201410199266.3A CN201410199266A CN103984367A CN 103984367 A CN103984367 A CN 103984367A CN 201410199266 A CN201410199266 A CN 201410199266A CN 103984367 A CN103984367 A CN 103984367A
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Abstract
The invention relates to the technical field of waste water treatment pools, in particular to an automatic air flotation filtering tank liquid level control system. The control system is characterized by comprising an ultrasonic level gauge and a back flushing vehicle, wherein the ultrasonic level gauge and the back flushing vehicle are arranged above an air flotation filtering tank. A water outlet pipe of the air flotation filtering tank is further provided with a water outlet adjusting valve. The water outlet adjusting valve and the ultrasonic level gauge are connected with a PLC and an analog quantity expansion module, wherein the PLC is used for receiving data and sending control signals. The analog quantity expansion module is connected with the PLC through a special connecting line. The back flushing vehicle is connected with the PLC through a control line. By the adoption of a PID adjuster programmed inside the PLC, parameter correction can be carried out by combining the operation working condition of the air flotation filtering tank, and the liquid level is controlled when the air flotation filtering tank operates normally; when the air flotation filtering tank carries out back flushing, back flushing signals are collected, a feed-forward signal is introduced into the PID adjuster, the open degree of the adjusting valve is adjusted in advance, and therefore the liquid level will not be lowered in the back flushing process; moreover, the filtering tank discharges slag smoothly in the back flushing process, and the back flushing effect is guaranteed.
Description
Technical field
The present invention relates to control technology field, wastewater treatment pond, especially relate to a kind of Airfloat filtering pond automatic Control Systems of Liquids Height.
Background technology
In engineering of water treatment, Airfloat filtering pond will be got rid of the scum silica frost of generation in process of production in time, to prevent that scum silica frost from sinking to reducing the water quality of water outlet and polluting filtrate.The prerequisite of deslagging is that the water level that will guarantee Chi Shui maintains in a normal scope smoothly, and the scraper plate that makes to remove the gred can normally be worked.Therefore must strictly control pool inner water position.The turnover valve opening that adopts manual control pond in the prior art, to keep water level in water pool to change within allowed band.But because sump area is large, affect factor that inflow changes comparatively complicated (particularly when backwash technique), cause the variation of filter tank water level larger, therefore manual control valve opening has suitable difficulty, and the variation of water level changes and has very long retardation time compared with valve opening, add the simple duplication of labour, easily cause operating personnel's fatigue and be sick of.So manual control is waste of manpower not only, can not guarantee to control water level in the scope of technological requirement.Also useful float water-level control apparatus is controlled electrically operated valve and is opened and closed in the prior art, realizes that pond water water level controls.But because of the sensitivity of float control device poor, movement response is slower, make the control accuracy of this technical scheme be difficult to guarantee, on the other hand, due to motorized valve high point with the door open, not only can cause water level variation by a relatively large margin, also can frequently turn round because of motor-operating mechanism, acceleration equipment aging, further reduces the reliability of device.
Summary of the invention
The object of the invention is to avoid the deficiencies in the prior art that a kind of Airfloat filtering pond automatic Control Systems of Liquids Height is provided, thereby effectively solve the problem of prior art.
For achieving the above object, the technical scheme that the present invention takes is: described a kind of Airfloat filtering pond automatic Control Systems of Liquids Height, be characterized in comprising the ultrasonic level gage and the recoil car that are arranged on Airfloat filtering pond top, on the rising pipe of Airfloat filtering pond, be also provided with out water regulating valve, go out water regulating valve and ultrasonic level gage and send the PLC controller of control signal and analog quantity spread module to be connected for receiving Data Concurrent, analog quantity spread module is connected with PLC controller by Special-purpose connecting line, and described recoil car is connected with PLC controller by control line.
Described PLC controller adopts the PID regulator of PLC inside programming, analog quantity spread module is that element is sent in regulator signal collection and the instruction of PID, its input signal is the instruction of flotation tank liquid level and feedback, output order is control valve opening, when PLC controller is controlled the work of recoil car, PID regulator in PLC can be introduced a feed-forward signal, in advance control valve.
Described ultrasonic level gage is connected with LT-with the liquid level feedback control port LT+ of analog quantity spread module, and the described water regulating valve that goes out is connected with aperture command port MO+, MO-with open degree feedback port MI+, the MI-of analog quantity spread module respectively.
The invention has the beneficial effects as follows: described a kind of Airfloat filtering pond automatic Control Systems of Liquids Height, it is by adopting the PID regulator of PLC inside programming, can carry out parameter correction in conjunction with flotation tank operating condition, when flotation tank normally moves, carry out liquid level control, when flotation tank recoils, gather recoil signal, on PID regulator, introduce a feed-forward signal, controlling opening of valve can not decline liquid level in back flushing process in advance, while guaranteeing to recoil, pond body deslagging is smooth and easy, has ensured repercussion effect.
Accompanying drawing explanation
Fig. 1 is structural principle schematic diagram of the present invention.
In figure: 1.PLC controller; 2. analog quantity control module; 3. car recoils; 4. ultrasonic level gage; 5. go out water regulating valve; 6. Airfloat filtering pond.
Embodiment
Below in conjunction with accompanying drawing, principle of the present invention and feature are described, example, only for explaining the present invention, is not intended to limit scope of the present invention.
As shown in Figure 1, described a kind of Airfloat filtering pond automatic Control Systems of Liquids Height, be characterized in comprising the ultrasonic level gage 4 and the recoil car 3 that are arranged on Airfloat filtering pond 6 tops, on the rising pipe of Airfloat filtering pond 6, be also provided with out water regulating valve 5, go out water regulating valve 5 and ultrasonic level gage 4 and send the PLC controller 1 of control signal and analog quantity spread module 2 to be connected for receiving Data Concurrent, analog quantity spread module 2 is connected with PLC controller 1 by Special-purpose connecting line, and described recoil car 3 is connected with PLC controller 1 by control line.
Described PLC controller 1 adopts the PID regulator of PLC inside programming, analog quantity spread module 2 is that element is sent in regulator signal collection and the instruction of PID, its input signal is the instruction of flotation tank liquid level and feedback, output order is control valve opening, when PLC controller 1 is controlled the work of recoil car 3, PID regulator in PLC can be introduced a feed-forward signal, in advance control valve.
Described ultrasonic level gage 4 is connected with LT-with the liquid level feedback control port LT+ of analog quantity spread module 2, and the described water regulating valve 5 that goes out is connected with aperture command port MO+, MO-with open degree feedback port MI+, the MI-of analog quantity spread module 2 respectively.
What described PLC controller and analog quantity spread module adopted is Siemens S7-200 controller and analog quantity spread module, situation for the recoil operation of recoil car, pass through test of many times, summing up recoil water consumption affects the mathematics corresponding relation of liquid level, controller is when receiving recoil run signal, by programming Control regulator controlling opening of valve before liquid level changes, control in time flotation tank liquid level.
Described a kind of Airfloat filtering pond automatic Control Systems of Liquids Height, detailed process is, when flotation tank liquid level declines, LT reduces, and signal is transferred to PLC, by parameter conversion, outputs to PID regulator+end, PID output is reduced, valve opening command M O reduces, thereby flotation tank water outlet reduces, and liquid level increases.When flotation tank liquid level rises, LT increases, and by parameter conversion, outputs to PID regulator+end, and PID output is increased, and valve opening command M O increases, thereby flotation tank water outlet increases, and liquid level reduces.When flotation tank recoils, send recoil enabling signal to PLC, be programmed in a feed-forward signal of introducing on PID regulator+end, the ratio of feed-forward signal size and backwashing strength and water production rate, is generally the 5%-10% of aperture, and there is different numerical value in different filter tanks, make like this water outlet control valve reduce in advance aperture, the liquid level of offsetting when recoil depletion clear water reduces, and the water yield reducing while recoiling so can not affect liquid level has too large variation, the deslagging effect while guaranteeing to recoil.
Ultrasonic level gage is installed on flotation tank, flotation tank rising pipe is installed intelligent regulating valve, adopt small PLC controller, form a control system, system by gather flotation tank liquid level, the valve position that gathers water outlet electric control valve in PLC, by the programming in controller, analyze each data, export suitable valve position instruction, control out the aperture of water regulating valve in time, reach and stablize flotation tank liquid level and make in the scope of the following 100mm of effluent weir a reliable scope.
In practical implementation, while dropping into automatic control of liquid, within the scope of can be stabilized in ± 60mm of flotation tank liquid level, especially, in back flushing process, can stablize preferably liquid level, if do not drop into automatic control of liquid level, liquid level during recoil changes can surpass 400mm.Therefore, it is little that this tank level control system can guarantee that Airfloat filtering pond liquid level in water processed and back flushing process changes, while guaranteeing to recoil flotation tank level stability under effluent weir-100mm in, make pond body row scum silica frost smooth and easy, ensure repercussion effect, thereby improved the operational effect of flotation tank.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (3)
1. an Airfloat filtering pond automatic Control Systems of Liquids Height, it is characterized in that comprising the ultrasonic level gage and the recoil car that are arranged on Airfloat filtering pond top, on the rising pipe of Airfloat filtering pond, be also provided with out water regulating valve, go out water regulating valve and ultrasonic level gage and send the PLC controller of control signal and analog quantity spread module to be connected for receiving Data Concurrent, analog quantity spread module is connected with PLC controller by Special-purpose connecting line, and described recoil car is connected with PLC controller by control line.
2. a kind of Airfloat filtering pond automatic Control Systems of Liquids Height according to claim 1, it is characterized in that: described PLC controller adopts the PID regulator of PLC inside programming, analog quantity spread module is that element is sent in regulator signal collection and the instruction of PID, its input signal is the instruction of flotation tank liquid level and feedback, output order is control valve opening, when PLC controller is controlled the work of recoil car, the PID regulator in PLC can be introduced a feed-forward signal, in advance control valve.
3. a kind of Airfloat filtering pond automatic Control Systems of Liquids Height according to claim 1, it is characterized in that: described ultrasonic level gage is connected with LT-with the liquid level feedback control port LT+ of analog quantity spread module, the described water regulating valve that goes out is connected with aperture command port MO+, MO-with open degree feedback port MI+, the MI-of analog quantity spread module respectively.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410199266.3A CN103984367A (en) | 2014-05-11 | 2014-05-11 | Automatic air flotation filtering tank liquid level control system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410199266.3A CN103984367A (en) | 2014-05-11 | 2014-05-11 | Automatic air flotation filtering tank liquid level control system |
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| CN103984367A true CN103984367A (en) | 2014-08-13 |
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| CN201410199266.3A Pending CN103984367A (en) | 2014-05-11 | 2014-05-11 | Automatic air flotation filtering tank liquid level control system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107935087A (en) * | 2017-12-12 | 2018-04-20 | 玖龙纸业（东莞）有限公司 | A kind of full-automatic air supporting control system and control method |
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| CN107935087A (en) * | 2017-12-12 | 2018-04-20 | 玖龙纸业（东莞）有限公司 | A kind of full-automatic air supporting control system and control method |
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| C53 | Correction of patent of invention or patent application | ||
| CB02 | Change of applicant information |
Address after: 730030, 6 floor, Xin Sheng building, 279 Jiuquan Road, Chengguan District, Gansu, Lanzhou Applicant after: Gansu Jinqiao water science and Technology (Group) Limited by Share Ltd Address before: 730030, Lanzhou Central Plaza, Gansu, 6 floor Applicant before: Gansu Jinqiao Water Treatment Technique Ltd. |
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| CB03 | Change of inventor or designer information |
Inventor after: Wang Gang Inventor after: Ye Quan Inventor after: Zhou Zhenwei Inventor after: Jia Bailin Inventor after: Yan Peiquan Inventor before: Wang Gang Inventor before: Liu Lin Inventor before: Zhao Kai |
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Free format text: CORRECT: INVENTOR; FROM: WANG GANG LIU LIN ZHAO KAI TO: WANG GANG YE QUAN ZHOU ZHENWEI JIA BOLIN YAN PEIQUAN Free format text: CORRECT: APPLICANT; FROM: GANSU JINQIAO WATER TREATMENT TECHNOLOGY ENGINEERING LTD. TO: GANSU GOLDEN BRIGE WATER TECHNOLOGY (GROUP) CO., LTD. |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140813 |