CN104611485A - Small and medium size blast furnace top pressure control method based on pressure reducing valve group - Google Patents

Small and medium size blast furnace top pressure control method based on pressure reducing valve group Download PDF

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CN104611485A
CN104611485A CN201410855296.5A CN201410855296A CN104611485A CN 104611485 A CN104611485 A CN 104611485A CN 201410855296 A CN201410855296 A CN 201410855296A CN 104611485 A CN104611485 A CN 104611485A
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value
air valve
pressure
ting
blast furnace
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CN104611485B (en
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吕兵兵
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Wisdri Engineering and Research Incorporation Ltd
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Wisdri Engineering and Research Incorporation Ltd
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Abstract

The invention belongs to the field of top pressure control during blast furnace ironmaking, and provides a small and medium size blast furnace top pressure control method based on a pressure reducing valve group. The method comprises the following steps: receiving, by a controller, a pressure measurement value which is transmitted by a blast furnace top pressure sensor; inputting the pressure measurement value and a pre-stored pressure preset value into a proportion-integral-differential (PID) operation to obtain an air valve set value; receiving an air valve measurement value which is returned by a pressure reducing valve in a servo control system; calculating to obtain an air valve control value at the moment by utilizing the PID operation according to the air valve set value and the air valve measurement value; controlling pressure reducing valves according to the air valve control value. According to the small and medium size blast furnace top pressure control method based on the pressure reducing valve group, the air valve set value is obtained by an air pressure measurement value and an air pressure set value, and an air valve control value is obtained based on an air valve measurement value, so that a double closed-loop PID control is formed, and the timeliness and the accuracy of air valve group regulation are improved.

Description

A kind of medium and small blast furnace top pressure control method based on reducer unit
Technical field
The invention belongs to the top pressure control field of blast furnace ironmaking, particularly relate to a kind of medium and small blast furnace top pressure control method based on reducer unit.
Background technology
Reducer unit is the key equipment controlling blast furnace top pressure, ensure high top pressure operation.It is under the cooperation of electrohydraulic servo-controlling system, adjusts furnace top pressure, blast furnace is normally produced under stable furnace top pressure by aperture that is accurate, adjustment reducing valve in time.Reducer unit is made up of two and above variable valve, and each variable valve is furnished with a performer and valve position transmitter etc.
Electrohydraulic servo-controlling system is made up of servo controller, electrohydraulic servo valve and hydraulic oil unit etc.The instruction signal of servo controller reception from middle control and the position signal of reality, and carry out comprehensive, compare, correct and amplify after generation one standard (electric current, voltage) signal, and by standard (electric current, voltage) signal feeding electrohydraulic servo valve.Standard (electric current, voltage) signal is transformed into hydraulic pressure oil mass by electrohydraulic servo valve according to a certain percentage, hydro-cylinder accepts the pressure oil that servo-valve exports, piston is moved back and forth on request, thus controls the folding of air valve, and the depth of folding.
But the folding speed of the air valve group of servo-control system is comparatively slow in prior art, usually when receiving new air valve adjustment signal, the air valve group adjustment of previous round does not also complete, and promptness and the accuracy of the adjustment of air valve group are poor.
Summary of the invention
The object of the embodiment of the present invention is to provide a kind of medium and small blast furnace top pressure control method based on reducer unit, with the problem that the promptness and accuracy that solve the adjustment of prior art air valve group are poor.
The embodiment of the present invention is achieved in that a kind of medium and small blast furnace top pressure control method based on reducer unit, said method comprising the steps of:
Controller receives the pressure measuring value that blast furnace top pressure sensor passes is come; By described pressure measuring value and the pressure preset value input proportional-integral-differential PID arithmetic prestored, obtain air valve set(ting)value; Receive the air valve observed value that in servo-control system, reducing valve returns; According to described air valve set(ting)value and described air valve observed value, calculate Air Valve Control value now by PID arithmetic; Reducing valve is controlled according to described Air Valve Control value.
The beneficial effect of a kind of medium and small blast furnace top pressure control method based on reducer unit that the embodiment of the present invention provides comprises: obtain air valve set(ting)value by the gentle definite value that is installed with of gas pressure measurement, and obtain Air Valve Control value based on air valve observed value, thus constitute a two-loop system, improve promptness and accuracy that in servo-control system, air valve group regulates.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the schema of a kind of medium and small blast furnace top pressure control method based on reducer unit that the embodiment of the present invention provides;
Fig. 2 is the schema of a kind of medium and small blast furnace top pressure control method based on reducer unit that the embodiment of the present invention provides;
Fig. 3 is the schema of a kind of medium and small blast furnace top pressure control method based on reducer unit that the embodiment of the present invention provides.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
In order to technical solutions according to the invention are described, be described below by specific embodiment.
Embodiment one
Be illustrated in figure 1 the schema of the medium and small blast furnace top pressure control method based on reducer unit provided by the invention, said method comprising the steps of:
In step 201, controller receives the pressure measuring value that blast furnace top pressure sensor passes is come.
In specific implementation, described controller can be programmable logic controller (Programmable Logic Controller, be abbreviated as: PLC) or dcs (Distributed Control System, is abbreviated as: DCS).
In step 202., by described pressure measuring value and pressure preset value input proportional-integral-differential (proportionintegration-differentiation., is abbreviated as: the PID) computing prestored, air valve set(ting)value is obtained.
In step 203, the air valve observed value that in servo-control system, reducing valve returns is received.
In step 204, according to described air valve set(ting)value and described air valve observed value, calculate Air Valve Control value now by PID arithmetic.
Its principle and top gas pressure-controlled similar, namely the state of air valve and furnace roof air pressure are all be in a upset condition, its observed value is all real-time obtaining from respective sensor, and the pressure preset value prestored can be store in the controller in advance, also can be inputted by operator when starting; Compare, the air valve set(ting)value of servo hydraulic system, then calculate based on pressure preset value and pressure measuring value.
In the present embodiment, the computation process of step 204 can be complete in the controller, also can be complete in hydraulic servo control system, not do particular determination at this.
In step 205, reducing valve is controlled according to described Air Valve Control value.
Described control reducing valve specifically comprises: hydraulic servo control system, by inner electro-hydraulic servo valvegear, exports corresponding hydraulic pressure signal to reducer unit, increases or reduce the aperture of reducer unit, and then improves or reduce blast furnace top pressure observed value.
The embodiment of the present invention obtains air valve set(ting)value by the gentle definite value that is installed with of gas pressure measurement, and obtain Air Valve Control value based on air valve observed value, thus constitute a two-loop system, solve promptness that air valve group in prior art regulates and the poor problem of accuracy.
Embodiment two
Be illustrated in figure 2 the schema of the medium and small blast furnace top pressure control method based on reducer unit that the embodiment of the present invention provides, in the present embodiment, the process calculating air valve set(ting)value has been come by PLC, and the process calculating Air Valve Control value has been come by hydraulic servo control system, further PID arithmetic method is disclosed in the present embodiment.It is as follows that described method specifically comprises flow process:
In step 301, top gas pressure sensor transmission of pressure observed value is to PLC.
In step 302, PLC, according to pressure measuring value and pressure preset value, calculates via PID arithmetic method and obtains air valve set(ting)value.
PID arithmetic method for obtaining air valve set(ting)value is specially and utilizes formula (1) to calculate:
u 1 ( t ) = K p 1 [ e 1 ( t ) + 1 T i 1 ∫ 0 t e 1 ( τ ) dτ + T d 1 d ( e 1 ( t ) ) dt ] - - - ( 1 )
Wherein, e 1t difference that () is gas pressure measurement and air pressure preset value, K p1for rate mu-factor, T i1for integration time constant, T d1for derivative time constant, described K p1, T i1and T d1value be by pid algorithm debug obtain; u 1t is air valve set(ting)value.
In step 303, the air valve set(ting)value calculated is passed to hydraulic servo control system by PLC.
Servo-control system is integrated with digital signal processor (Digital Signal Processor usually, be abbreviated as: DSP) chip, filtering circuit, modulus digital-to-analog conversion and other translation circuit etc., control in application at blast furnace top pressure, major function receives reducer unit valve position observed value and outside valve position Setting signal, by the logical operation of inside, export 4 ~ 20mA DC, the standard signal of 0 ~ 10V DC etc. is to servo-hydraulic station, servo-hydraulic station is by inner electrohydraulic servo valve etc., receive standard signal, output hydraulic pressure oil mass, the aperture of accurate control reducer unit.
In step 304, described hydraulic servo control system, after receiving air valve set(ting)value, transfers current air valve observed value to air valve group sensor.
In step 305, described air valve group sensor returns air valve observed value to hydraulic servo control system.
Within step 306, described hydraulic servo control system calculates Air Valve Control value based on air valve set(ting)value and air valve observed value.
PID arithmetic for obtaining Air Valve Control value is specially and utilizes formula (2) to calculate:
u 2 ( t ) = K p 2 [ e 2 ( t ) + 1 T i 2 ∫ 0 t e 2 ( τ ) dτ + T d 2 d ( e 2 ( t ) ) dt ] - - - ( 2 )
Wherein, e 2t difference that () is air valve observed value and described air valve set(ting)value, K p2for rate mu-factor, T i2for integration time constant, T d2for derivative time constant, described K p2, T i2and T d2value be by pid algorithm debug obtain; u 2t is Air Valve Control value.
In step 307, described hydraulic servo control system, according to described Air Valve Control value, controls the adjustment that air valve group completes air valve folding.
In embodiments of the present invention, the closed PID arithmetic provided for Air Valve Control controls, thus overcome promptness that air valve group in prior art regulates and the poor problem of accuracy, and by the cooperation of PLC and hydraulic servo control system, on guarantee Air Valve Control promptness, accuracy and stationarity basis, improve the execution efficiency of system.
Embodiment three
On the basis that the present embodiment realizes based on embodiment two, increase step 308-310 newly, thus extended the function of embodiment two, given a kind of predictive mode, be implemented as follows:
Embodiment two is shown in the realization of step 301-307, repeats no more here.
In step 308, hydraulic servo control system, according to the air valve observed value got, calculates the closing speed of air valve, and sends to PLC.
In a step 309, PLC, according to the pressure measuring value of air valve closing speed and current acquisition, calculates air pressure and air valve pace of change relation.
In the step 310, PLC predicts a stable state Air Valve Control value, and passes to hydraulic servo control system, enters predictive mode.
The calculating of described stable state Air Valve Control value calculates under the blast furnace pneumatic floating size constraint allowed in industry is smelted, and give air pressure threshold value and predicted time threshold value, when exceeding described air pressure threshold value or exceeding that predicted time threshold value is unrealized adjusts to air pressure set(ting)value, then jump out described predictive mode.
In embodiments of the present invention, further apply the relation between the pneumatic control system under PLC control and the air valve group under hydraulic servo control system control, give the realization of new predictive mode, in the scope that industrial realization allows, improve automatism and the efficiency of blast furnace roof air pressure control.
Those of ordinary skill in the art it is also understood that, the all or part of step realized in above-described embodiment method can have been come by the hardware that programmed instruction is relevant, described program can be stored in a computer read/write memory medium, described storage media, comprises ROM/RAM, disk, CD etc.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.

Claims (9)

1. based on a medium and small blast furnace top pressure control method for reducer unit, it is characterized in that, described method comprises:
Controller receives the pressure measuring value that blast furnace top pressure sensor passes is come;
By described pressure measuring value and the pressure preset value input proportional-integral-differential PID arithmetic prestored, obtain air valve set(ting)value;
Receive the air valve observed value that in servo-control system, reducing valve returns;
According to described air valve set(ting)value and described air valve observed value, calculate Air Valve Control value now by PID arithmetic;
Reducing valve is controlled according to described Air Valve Control value.
2. the method for claim 1, is characterized in that, is specially for the PID arithmetic obtaining air valve set(ting)value:
u 1 ( t ) = K p 1 [ e 1 ( t ) + 1 T i 1 ∫ 0 t e 1 ( τ ) dτ + T d 1 d ( e 1 ( t ) ) dt ]
Wherein, e 1t difference that () is gas pressure measurement and air pressure preset value, K p1for rate mu-factor, T i1for integration time constant, T d1for derivative time constant, described K p1, T i1and T d1value be by pid algorithm debug obtain; u 1t is air valve set(ting)value.
3. the method as described in as arbitrary in claim 1 or 2, is characterized in that, be specially for the PID arithmetic obtaining Air Valve Control value:
u 2 ( t ) = K p 2 [ e 2 ( t ) + 1 T i 2 ∫ 0 t e 2 ( τ ) dτ + T d 2 d ( e 2 ( t ) ) dt ]
Wherein, e 2t difference that () is air valve observed value and described air valve set(ting)value, K p2for rate mu-factor, T i2for integration time constant, T d2for derivative time constant, described K p2, T i2and T d2value be by pid algorithm debug obtain; u 2t is Air Valve Control value.
4. as power require 1-3 arbitrary as described in method, it is characterized in that, described according to described air valve set(ting)value and described air valve observed value, calculate Air Valve Control value now by PID arithmetic, specifically comprise:
The Controlling System of reducer unit receives the next air valve set(ting)value of described controller transmission;
The Controlling System of described reducer unit obtains the air valve observed value that air valve sensor returns;
According to described air valve set(ting)value and described air valve observed value, calculate Air Valve Control value now by PID arithmetic.
5. the method as described in as arbitrary in claim 1-4, it is characterized in that, described servo-control system is specially hydraulic servo control system.
6. method as claimed in claim 5, it is characterized in that, described hydraulic servo control system controls reducing valve according to described Air Valve Control value, specifically comprises:
Hydraulic servo control system, by inner electro-hydraulic servo valvegear, exports corresponding hydraulic pressure signal to reducer unit, increases or reduce the aperture of reducer unit, and then improves or reduce blast furnace top pressure observed value.
7. the method as described in as arbitrary in claim 1-6, it is characterized in that, described method is applicable to volume of boiler scale and is less than or equal to 1800m 3.
8. the method as described in as arbitrary in claim 1-7, it is characterized in that, described Air Valve Control value is specially the standard electric signal of 4 ~ 20mA DC or 0 ~ 10V DC.
9. the method as described in as arbitrary in claim 1-7, it is characterized in that, described air valve observed value also passes to described controller, described by described pressure measuring value and the pressure preset value input proportional-integral-differential PID arithmetic prestored, obtain air valve set(ting)value, also comprise:
By described pressure measuring value, the pressure preset value prestored and air valve observed value input proportional-integral-differential PID arithmetic, obtain air valve set(ting)value.
CN201410855296.5A 2014-12-31 2014-12-31 Small and medium size blast furnace top pressure control method based on pressure reducing valve group Active CN104611485B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113373272A (en) * 2021-06-11 2021-09-10 山东钢铁股份有限公司 Control method for top pressure of blast furnace
CN114321062A (en) * 2021-12-24 2022-04-12 浙江华章科技有限公司 Oil station hydraulic station pressure prediction and maintenance system

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CN103509895A (en) * 2013-10-09 2014-01-15 马钢(集团)控股有限公司 Method for controlling pressure of furnace top of blast furnace by combining TRT stationary blade and pressure reducing valve group

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CN103509895A (en) * 2013-10-09 2014-01-15 马钢(集团)控股有限公司 Method for controlling pressure of furnace top of blast furnace by combining TRT stationary blade and pressure reducing valve group

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113373272A (en) * 2021-06-11 2021-09-10 山东钢铁股份有限公司 Control method for top pressure of blast furnace
CN114321062A (en) * 2021-12-24 2022-04-12 浙江华章科技有限公司 Oil station hydraulic station pressure prediction and maintenance system
CN114321062B (en) * 2021-12-24 2023-07-14 浙江华章科技有限公司 Oil station hydraulic pressure station pressure prediction and maintenance system

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