CN104611485B - Small and medium size blast furnace top pressure control method based on pressure reducing valve group - Google Patents

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

It is the invention belongs to the top pressure control field of blast furnace ironmaking more particularly to a kind of based on the middle-size and small-size of reducer unit Method for controlling pressure of blast furnace top.

Background technology

Reducer unit is to control blast furnace top pressure, ensure the key equipment of operation with high pressure.It is in electro-hydraulic servo control system Under the cooperation of system, furnace top pressure is adjusted by the aperture of accurate, timely adjustment pressure-reducing valve, make blast furnace in the furnace top pressure of stabilization Lower normal production.Reducer unit is made up of two and above regulating valve, and each regulating valve is equipped with an actuator and valve position pick-up Device etc..

Electrohydraulic servo-controlling system is made up of servo controller, electrohydraulic servo valve and hydraulic oil unit etc..Servo controller connects Receive the position signalling of command signal from middle control and reality, and carry out synthesis, compare, correct and amplify after generate a standard (electric current, voltage) signal, and standard (electric current, voltage) signal is sent into electrohydraulic servo valve.Electrohydraulic servo valve is according to a certain percentage Standard (electric current, voltage) signal is transformed into The hydraulic oil, hydraulic cylinder receives the pressure oil of servo valve output, makes piston on request Move back and forth, so as to control the folding of air valve, and folding depth.

But the folding speed of the air valve group of servo-control system is slower in the prior art, generally new air valve is being received During adjustment signal, the air valve group adjustment of previous round has not been completed, and the promptness and accuracy of air valve group regulation are poor.

The content of the invention

The purpose of the embodiment of the present invention is to provide a kind of medium and small blast furnace top pressure control side based on reducer unit Method, it is poor with the promptness and accuracy that solve the problems, such as the regulation of prior art air valve group.

The embodiment of the present invention is achieved in that a kind of medium and small blast furnace top pressure control side based on reducer unit Method, the described method comprises the following steps：

Controller receives the pressure measuring value that blast furnace top pressure sensor passes come；By the pressure measuring value and in advance The pressure preset input proportional-integral-differential PID arithmetic deposited, obtains air valve setting value；Receive decompression in servo-control system The air valve measured value that valve is returned；According to the air valve setting value and the air valve measured value, it is calculated now by PID arithmetic Air Valve Control value；Pressure-reducing valve is controlled according to the Air Valve Control value.

A kind of medium and small blast furnace top pressure control method based on reducer unit provided in an embodiment of the present invention it is beneficial Effect includes：Air valve setting value is obtained by gas pressure measurement and air pressure setting value, and air valve is obtained based on air valve measured value Controlling value, so as to constitute a two-loop system, improves the promptness and standard of air valve group regulation in servo-control system True property.

Brief description of the drawings

Technical scheme in order to illustrate more clearly the embodiments of the present invention, below will be to embodiment or description of the prior art Needed for the accompanying drawing to be used be briefly described, it should be apparent that, drawings in the following description are only more of the invention Embodiment, for those of ordinary skill in the art, on the premise of not paying creative work, can also be attached according to these Figure obtains other accompanying drawings.

Fig. 1 is a kind of medium and small blast furnace top pressure control method based on reducer unit provided in an embodiment of the present invention Flow chart；

Fig. 2 is a kind of medium and small blast furnace top pressure control method based on reducer unit provided in an embodiment of the present invention Flow chart；

Fig. 3 is a kind of medium and small blast furnace top pressure control method based on reducer unit provided in an embodiment of the present invention Flow chart.

Specific embodiment

In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and It is not used in the restriction present invention.

In order to illustrate technical solutions according to the invention, illustrated below by specific embodiment.

Embodiment one

The flow of the medium and small blast furnace top pressure control method based on reducer unit for being provided for the present invention as shown in Figure 1 Figure, the described method comprises the following steps：

In step 201, controller receives the pressure measuring value that blast furnace top pressure sensor passes come.

In implementing, the controller can be programmable logic controller (PLC) (Programmable Logic Controller, is abbreviated as：PLC) or dcs (Distributed Control System, are abbreviated as： DCS)。

In step 202., the pressure measuring value and the pressure preset for prestoring are input into proportional-integral-differential (proportion integration-differentiation., are abbreviated as：PID) computing, obtains air valve setting value.

In step 203, the air valve measured value of pressure-reducing valve return in servo-control system is received.

In step 204, according to the air valve setting value and the air valve measured value, this is calculated by PID arithmetic When Air Valve Control value.

Its principle system voltage-controlled with top gas is similar, i.e., the state of air valve and furnace roof air pressure are at a upset condition, Its measured value is all to be obtained from respective sensor in real time, and the pressure preset for prestoring can be previously stored in control It is in device, or on startup by operating personnel be input into；Compare, the air valve setting value of servo hydraulic system, then It is calculated based on pressure preset and pressure measuring value.

In the present embodiment, the calculating process of step 204 can be completed in the controller, or in hydraulic servo control Completed in system processed, particular determination is not done herein.

In step 205, pressure-reducing valve is controlled according to the Air Valve Control value.

The control pressure-reducing valve is specifically included：Hydraulic servo control system is by internal electro-hydraulic servo valve gear, output Corresponding hydraulic pressure signal increases or reduces the aperture of reducer unit to reducer unit, and then raising or reduction blast furnace top pressure are surveyed Value.

The embodiment of the present invention obtains air valve setting value by gas pressure measurement and air pressure setting value, and based on air valve measurement Value obtains Air Valve Control value, so as to constitute a two-loop system, solves the timely of air valve group regulation in the prior art Property and the poor problem of accuracy.

Embodiment two

It is illustrated in figure 2 the medium and small blast furnace top pressure control method based on reducer unit provided in an embodiment of the present invention Flow chart, in the present embodiment, the process for calculating air valve setting value is completed by PLC, and calculates the process of Air Valve Control value Completed by hydraulic servo control system, further open PID arithmetic method in the present embodiment.Methods described specifically includes flow It is as follows：

In step 301, furnace roof baroceptor transmits pressure measuring value to PLC.

In step 302, PLC is calculated via PID arithmetic method and is obtained air valve according to pressure measuring value and pressure preset Setting value.

PID arithmetic method for obtaining air valve setting value is specially and is calculated using formula (1)：

Wherein, e₁T () is the difference of gas pressure measurement and air pressure preset value, K_p1It is rate mu-factor, T_i1During for integration Between constant, T_d1It is derivative time constant, the K_p1、T_i1And T_d1Value be by pid algorithm debug obtain；u₁T sets for air valve Value.

In step 303, the air valve setting value that PLC will be calculated passes to hydraulic servo control system.

Servo-control system has been generally integrated digital signal processor, and (Digital Signal Processor, are abbreviated as： DSP) chip, filter circuit, modulus digital-to-analogue conversion and other translation circuits etc., in blast furnace top pressure control application, mainly Function is to receive reducer unit valve position measured value and external valve position Setting signal, by internal logical operation, output one 4~ The standard signal of 20mA DC, 0~10V DC etc. connects to servo-hydraulic station, servo-hydraulic station by internal electrohydraulic servo valve etc. Receive standard signal, output hydraulic pressure oil mass, the aperture of precise control reducer unit.

In step 304, the hydraulic servo control system is adjusted after air valve setting value is received to air valve group sensor Take current air valve measured value.

In step 305, the air valve group sensor returns to air valve measured value to hydraulic servo control system.

Within step 306, the hydraulic servo control system is based on air valve setting value and air valve measured value calculates air outlet valve Controlling value.

PID arithmetic for obtaining Air Valve Control value is specially and is calculated using formula (2)：

Wherein, e₂T () is the difference of air valve measured value and the air valve setting value, K_p2It is rate mu-factor, T_i2It is product Divide time constant, T_d2It is derivative time constant, the K_p2、T_i2And T_d2Value be by pid algorithm debug obtain；u₂T is air valve control Value processed.

In step 307, according to the Air Valve Control value, control air valve group completes air valve to the hydraulic servo control system The adjustment of folding.

In embodiments of the present invention, there is provided for the closure PID arithmetic control of Air Valve Control, so as to overcome existing skill The promptness and the poor problem of accuracy of air valve group regulation in art, and by the cooperation of PLC and hydraulic servo control system, Ensure on the basis of Air Valve Control promptness, accuracy and stationarity, improve the execution efficiency of system.

Embodiment three

The present embodiment is based on the basis of the realization of embodiment two, step 308-310 has been increased newly, so as to extend embodiment two Function, give a kind of predictive mode, be implemented as follows：

Embodiment two is shown in the realization of step 301-307, is repeated no more here.

In step 308, hydraulic servo control system calculates the closure speed of air outlet valve according to the air valve measured value for getting Degree, and it is sent to PLC.

In a step 309, PLC calculates air pressure and air valve according to air valve closing speed and the current pressure measuring value for obtaining Pace of change relation.

In the step 310, PLC predicts a stable state Air Valve Control value, and passes to hydraulic servo control system, into pre- Survey pattern.

The calculating of the stable state Air Valve Control value is counted under the blast furnace pneumatic floating size constraint allowed during industry is smelted Obtain, and give air pressure threshold value and predicted time threshold value, when more than the air pressure threshold value or more than predicted time threshold value It is unrealized to be adjusted to air pressure setting value, then jump out the predictive mode.

In embodiments of the present invention, the pneumatic control system and hydraulic servocontrol under PLC controls are further applied The relation between air valve group under system control, gives the realization of new predictive mode, in the range of industrial realization permission, Improve the automaticity and efficiency of blast furnace roof air pressure control.

Those of ordinary skill in the art are further appreciated that all or part of step realized in above-described embodiment method is can To be completed by the related hardware of programmed instruction, described program can be stored in a computer read/write memory medium, Described storage medium, including ROM/RAM, disk, CD etc..

Presently preferred embodiments of the present invention is the foregoing is only, is not intended to limit the invention, it is all in essence of the invention Any modification, equivalent and improvement made within god and principle etc., should be included within the scope of the present invention.

Claims (9)

1. a kind of medium and small blast furnace top pressure control method based on reducer unit, it is characterised in that methods described includes：

Controller receives the pressure measuring value that blast furnace top pressure sensor passes come；

The pressure measuring value and the pressure preset for prestoring are input into proportional-integral-differential PID arithmetic, air valve setting is obtained Value；

Receive the air valve measured value of pressure-reducing valve return in servo-control system；

According to the air valve setting value and the air valve measured value, Air Valve Control value now is calculated by PID arithmetic；

Pressure-reducing valve is controlled according to the Air Valve Control value；

Methods described also includes：Hydraulic servo control system calculates the closure speed of air outlet valve according to the air valve measured value for getting Degree, and it is sent to PLC；

PLC calculates air pressure and air valve pace of change relation according to air valve closing speed and the current pressure measuring value for obtaining；

PLC predicts a stable state Air Valve Control value, and passes to hydraulic servo control system, into predictive mode；

The predictive mode includes air pressure threshold value and predicted time threshold value, when more than the air pressure threshold value or more than predicted time Threshold value is unrealized to be adjusted to air pressure setting value, then jump out the predictive mode.

2. the method for claim 1, it is characterised in that the PID arithmetic for obtaining air valve setting value is specially：

$u_1\left(t\right)=K_{p1}\[e_1\left(t\right)+\frac{1}{T_{i1}}{\∫}_0^t{e}_1\left(\mathrm{\τ}\right)d\mathrm{\τ}+Td1\frac{d\left(e_1\right(t\left)\right)}{dt}\]$

Wherein, e₁T () is the difference of gas pressure measurement and air pressure preset value, K_p1It is rate mu-factor, T_i1For the time of integration is normal Number, T_d1It is derivative time constant, the K_p1、T_i1And T_d1Value be by pid algorithm debug obtain；u₁T () is air valve setting value.

3. method as claimed in claim 1 or 2, it is characterised in that the PID arithmetic for obtaining Air Valve Control value is specially：

$u_2\left(t\right)=K_{p2}\[e_2\left(t\right)+\frac{1}{T_{i2}}{\∫}_0^t{e}_2\left(\mathrm{\τ}\right)d\mathrm{\τ}+T_{d2}\frac{d\left(e_2\right(t\left)\right)}{dt}\]$

Wherein, e₂T () is the difference of air valve measured value and the air valve setting value, K_p2It is rate mu-factor, T_i2During for integration Between constant, T_d2It is derivative time constant, the K_p2、T_i2And T_d2Value be by pid algorithm debug obtain；u₂T () is Air Valve Control Value.

4. the method as described in power requires 1 or 2, it is characterised in that described to be measured according to the air valve setting value and the air valve Value, Air Valve Control value now is calculated by PID arithmetic, is specifically included：

The control system of reducer unit receives the air valve setting value that the controller transmission comes；

The control system of the reducer unit obtains the air valve measured value that air valve sensor is returned；

According to the air valve setting value and the air valve measured value, Air Valve Control value now is calculated by PID arithmetic.

5. method as claimed in claim 1 or 2, it is characterised in that the servo-control system is specially hydraulic servocontrol System.

6. method as claimed in claim 5, it is characterised in that the hydraulic servo control system is according to the Air Valve Control value To control pressure-reducing valve, specifically include：

Hydraulic servo control system exports corresponding hydraulic pressure signal to reducer unit, increase by internal electro-hydraulic servo valve gear Or reduce the aperture of reducer unit, and then improve or reduce blast furnace top pressure measured value.

7. method as claimed in claim 1 or 2, it is characterised in that methods described is less than or equal to suitable for volume of boiler scale 1800m³。

8. method as claimed in claim 1 or 2, it is characterised in that the Air Valve Control value be specially 4~20mADC or 0~ The standard electric signal of 10V DC.

9. method as claimed in claim 1 or 2, it is characterised in that the air valve measured value also passes to the controller, institute State and the pressure measuring value and the pressure preset for prestoring be input into proportional-integral-differential PID arithmetic, obtain air valve setting value, Also include：

The pressure measuring value, the pressure preset for prestoring and air valve measured value are input into proportional-integral-differential PID arithmetic, are obtained Obtain air valve setting value.