CN103105868A - Control method based on dual-container cascade-stage liquid level system - Google Patents
Control method based on dual-container cascade-stage liquid level system Download PDFInfo
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- CN103105868A CN103105868A CN 201110385038 CN201110385038A CN103105868A CN 103105868 A CN103105868 A CN 103105868A CN 201110385038 CN201110385038 CN 201110385038 CN 201110385038 A CN201110385038 A CN 201110385038A CN 103105868 A CN103105868 A CN 103105868A
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Abstract
The invention discloses a control method based on a dual-container cascade-stage liquid level system. The method comprises that (a) a lower water pressure transmitter (5) detects a liquid level in a lower water tank (2), an upper water pressure transmitter (6) detects a liquid level in an upper water tank (3), the lower water pressure transmitter (5) and the upper water pressure transmitter (6) respectively send the detected signals to a controller (7); (b) the controller (7) outputs an adjustment command to a motor-driven control valve (4) according to the sent detected signals and practical requirements; (c) the motor-driven control valve (4) adjusts the opening of the motor-driven control valve (4) according to the command output by the controller (7), therefore water flow entering the lower water tank (2) and water flow entering the upper water tank (3) are adjusted, and then the liquid level in the lower water tank (2) and the liquid level in the upper water tank (3) are adjusted. The control method based on the dual-container cascade-stage liquid level system is good in control effect, low in control cost, and high in practical value. If disturbance occurs, a minor loop where a middle water tank is located can rapidly respond, influences of the disturbance are eliminated, and an ideal control effect is achieved.
Description
Technical field
The present invention relates to a kind of control method based on double volume tandem liquid level control system.
Background technology
Liquid level is one of control parameter that often runs in industrial process production, required control object is carried out accurate liquid level control, and is related to the quality of product, is the major issue that ensures production effect and safety.Thereby the control of liquid level has important practical significance and application prospect widely.
Control theory has experienced classical control theory, two developing stage of modern control theory, has entered now Nonlinear Intelligent control theory developing period.The problem that solves from control theory and opinion, a lot of great, basic problems as controllability, observability, stability etc., have all been set up fairly perfect theoretical system in tradition control.Use traditional control theory and substantially can satisfy the needs in engineering and various other fields.But along with the development of industry and modern science and technology, in every field, automatic control system is also more and more higher to the requirement of control accuracy, response speed, system stability and adaptive faculty.Since the eighties in last century, the quick update of robot calculator and the high-speed development of computing technique have promoted carrying out in a deep going way of control theory research, and have entered one section new course.Along with developing rapidly of control theory, many advanced persons' control algolithm has appearred.But the various controllers take PID as principle are still basic control unit indispensable in process control.So far, pid control algorithm worldwide is used in the industrial process more than 80%, and the PID control technology has obtained good development, and the researcher has proposed many Control System Design methods and parameter adjustment is theoretical.This is because PID control has simple in structure, easy realization, controls the characteristics such as effective, and the pid algorithm principle is simple and clear, the parameter explicit physical meaning, and the theoretical analysis system is complete, by vast control engineering teacher is familiar with.
Tank level control system is the system take liquid level as controlled parameter, and its every field in industry is related to widely.In industrial processes, having a lot of places to carry out liquid level to control object controls, make liquid level remain on accurately given numerical value, as in building material industry, glass furnace liquid level stable to the serviceable life of kiln and the quality of product playing vital effect.Also have in commercial production, especially also can often run into liquid level control problem in oil, chemical industry and metallurgical production.Therefore, required control object being carried out accurate liquid level control, be related to the realization of controlling target, is the major issue that ensures production effect and safety.
Nineteen thirty-nine, Taylor Instrument Company and Foxboro Instrument Company produce the pneumatic controller that has pid control function fully.People generally believe that PID should be referred to as Based Intelligent Control, because it is based on production operation personnel's control experience.The inventor thinks by observation, and controller should resemble and go to control a skilled operator, reduces until the error that occurs in the elimination system.Control three subject matters that have that face at PID at that time: (1) seeks a kind of straightforward procedure, regulates parameters for three that can calculate the PID controller.(2) judge whether production run is controlled.(3) operation of PID controller does not rely on the mechanical organ of complicated rapid wear.Theoretical research mainly concentrates on the first two problem, nineteen forty-two, gives part and solves.Second Problem is the controllability of system.The 3rd problem is due to the develop rapidly of the industrial revolution, and the PID controller of today uses electronic component and microprocessor substantially, has given the solution of almost Perfect.
The PID controller remains most widely used industrial control unit (ICU) now as the practical the earliest controller history of existing nearly 70 years.Trace it to its cause, be because the PID controller has following principal feature: (1) PID controller is easily understood, and does not need accurate especially system model in use.(2) usability is flexible, only needs to set three parameters and gets final product.Under many circumstances, whole three unit might not be needed, one to two unit wherein can be got.(3) pid parameter is more easily adjusted, and namely pid parameter can in time be adjusted according to the dynamic perfromance of process.If the dynamic perfromance of process changes, for example may be caused by the variation of load that system dynamic characteristic changes, pid parameter just can be adjusted again.And the step input response curve is the PID control most important foundation of effect and standard.It is generally acknowledged that it is the most serious interference that step is disturbed, as long as feedback control system can return to set-point in setting time under this type of disturbs, system meets the demands substantially.
Summary of the invention
The object of the invention is to overcome the shortcoming and defect of above-mentioned prior art, a kind of control method based on double volume tandem liquid level control system is provided, should not only have good control effect based on the control method of double volume tandem liquid level control system, and it is low to control cost, the control effect is fine, has higher practical value; And if thanks for your hospitality movable property and give birth to, the subloop at middle water tank place can react fast, eliminates the effect of disturbance, reaches desirable control effect.
Purpose of the present invention is achieved through the following technical solutions: the control method based on double volume tandem liquid level control system comprises the following steps:
(a) at first, the liquid level of launching stress transmitters sense in the lower header, the upper water pressure transmitters sense liquid level in the upper water box, and respectively the signal that detects is sent in controller;
(b) then, controller is according to detection signal and the actual demand sent into, and the output regulating command is to motor-operated control valve;
(c) motor-operated control valve is regulated its aperture according to the instruction of controller output, thereby regulates the current size that enters lower header, upper water box, and then regulates the water level in lower header, upper water box.
Extract water in reserve tank to lower header and upper water box by magnetic drive pump.
Give birth to when thanksing for your hospitality movable property, rapid reaction is carried out in the loop at upper water box place, eliminates the effect of disturbance, reaches desirable control effect.
The double volume tandem liquid level control system that the present invention is used, mainly consisted of by reserve tank, the lower header that is arranged on the reserve tank top, the upper water box that is arranged on the lower header top, interconnect between described reserve tank, lower header, upper water box, also comprise motor-operated control valve, described reserve tank, upper water box all are connected with motor-operated control valve by water pipe, and also are provided with control device on the water pipe between motor-operated control valve and lower header and upper water box.
Be provided with magnetic drive pump on water pipe between described reserve tank and motor-operated control valve.
Between described reserve tank and lower header, be provided with hand valve between lower header and upper water box.
Described control device is mainly by the launching stress transmitter that is connected with lower header, the upper water pressure transmitter that is connected with upper water box and consist of with the controller that upper water pressure transmitter all is connected with the launching stress transmitter, and described controller is connected with motor-operated control valve.
In sum, the invention has the beneficial effects as follows: not only have good control effect, and it is low to control cost, controls effect fine, have higher practical value; And if thanks for your hospitality movable property and give birth to, the subloop at middle water tank place can react fast, eliminates the effect of disturbance, reaches desirable control effect.
Description of drawings
Fig. 1 is structural representation of the present invention.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited only to this.
Embodiment:
The control method based on double volume tandem liquid level control system that the present invention relates to comprises the following steps:
(a) at first, launching stress transmitter 5 detects the liquid level in lower header 2, and upper water pressure transmitter 6 detects the liquid level in upper water box 3, and respectively the signal that detects is sent in controller 7;
(b) then, controller 7 is according to detection signal and the actual demand sent into, and the output regulating command is to motor-operated control valve 4;
(c) motor-operated control valve 4 is regulated its aperture according to the instruction of controller 7 outputs, thereby regulates the current size that enters lower header 2, upper water box 3, and then regulates the water level in lower header 2, upper water box 3.
Extract water in reserve tanks 1 to lower header 2 and upper water box 3 by magnetic drive pump 8.
Give birth to when thanksing for your hospitality movable property, rapid reaction is carried out in the loop at upper water box 3 places, eliminates the effect of disturbance, reaches desirable control effect.
The present invention system used as shown in Figure 1, mainly consisted of by reserve tank 1, the lower header 2 that is arranged on reserve tank 1 top, the upper water box 3 that is arranged on lower header 2 tops, interconnect between described reserve tank 1, lower header 2, upper water box 3, also comprise motor-operated control valve 4, described reserve tank 1, upper water box 3 all are connected with motor-operated control valve 4 by water pipe, and also are provided with control device on the water pipe between motor-operated control valve 4 and lower header 2 and upper water box 3.
Be provided with magnetic drive pump 8 on water pipe between described reserve tank 1 and motor-operated control valve 4.
Between described reserve tank 1 and lower header 2, be provided with hand valve 9 between lower header 2 and upper water box 3.
Described control device is mainly by the launching stress transmitter 5 that is connected with lower header 2, the upper water pressure transmitter 6 that is connected with upper water box 3 and consist of with the controller 7 that upper water pressure transmitter 6 all is connected with launching stress transmitter 5, and described controller 7 is connected with motor-operated control valve 4.
Motor-operated control valve 4 is used for the size of the inflow of adjusting upper water box 3, and launching stress transmitter 5 is for detection of the liquid level in lower header 2, and upper water pressure transmitter 6 is for detection of liquid level in upper water box 3, and the output quantity of controller 7 is used for controlling the aperture of motor-operated control valve 4.
The above is only preferred embodiment of the present invention, is not the present invention is done any pro forma restriction, and every foundation technical spirit of the present invention, any simple modification, equivalent variations that above embodiment is done are within all falling into protection scope of the present invention.
Claims (3)
1. based on the control method of double volume tandem liquid level control system, it is characterized in that, comprise the following steps:
(a) at first, launching stress transmitter (5) detects the liquid level in lower header (2), and upper water pressure transmitter (6) detects the liquid level in upper water box (3), and the signal that detects is sent in controller (7) respectively;
(b) then, controller (7) is according to detection signal and the actual demand sent into, and the output regulating command is to motor-operated control valve (4);
(c) motor-operated control valve (4) is regulated its aperture according to the instruction of controller (7) output, thereby regulate the current size that enters lower header (2), upper water box (3), and then regulate the water level in lower header (2), upper water box (3).
2. the control method based on double volume tandem liquid level control system according to claim 1, is characterized in that, extracts water in reserve tank (1) to lower header (2) and upper water box (3) by magnetic drive pump (8).
3. the control method based on double volume tandem liquid level control system according to claim 1, is characterized in that, gives birth to when thanksing for your hospitality movable property, and rapid reaction is carried out in the loop at upper water box (3) place, eliminates the effect of disturbance, reaches desirable control effect.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110385038 CN103105868A (en) | 2011-11-14 | 2011-11-14 | Control method based on dual-container cascade-stage liquid level system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110385038 CN103105868A (en) | 2011-11-14 | 2011-11-14 | Control method based on dual-container cascade-stage liquid level system |
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| CN103105868A true CN103105868A (en) | 2013-05-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110156203A (en) * | 2019-04-01 | 2019-08-23 | 大唐太原第二热电厂 | For the water treatment facilities of power plant and its except carbon control system and control method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110156203A (en) * | 2019-04-01 | 2019-08-23 | 大唐太原第二热电厂 | For the water treatment facilities of power plant and its except carbon control system and control method |
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Application publication date: 20130515 |