CN105368996B - A kind of autocontrol method for bf coal injection system injection amount - Google Patents

A kind of autocontrol method for bf coal injection system injection amount Download PDF

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Publication number
CN105368996B
CN105368996B CN201510711218.2A CN201510711218A CN105368996B CN 105368996 B CN105368996 B CN 105368996B CN 201510711218 A CN201510711218 A CN 201510711218A CN 105368996 B CN105368996 B CN 105368996B
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control
injection
regulating valve
injection rate
gear
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CN201510711218.2A
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CN105368996A (en
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赵蕊
张巍
毕晓海
郑志彬
马燕
郑晓丽
张磊
路广州
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北京金自天正智能控制股份有限公司
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    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21BMANUFACTURE OF IRON OR STEEL
    • C21B5/00Making pig-iron in the blast furnace
    • C21B5/001Injecting additional fuel or reducing agents
    • C21B5/003Injection of pulverulent coal
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21BMANUFACTURE OF IRON OR STEEL
    • C21B5/00Making pig-iron in the blast furnace
    • C21B5/006Automatically controlling the process

Abstract

The invention discloses a kind of autocontrol method for bf coal injection system injection amount, including following steps:Step one:Obtain accurate injection rate;Step 2:Tracing control injection rate is adjusted using PID;Step 3:After above-mentioned control injection rate process error fluctuation is completed, points for attention during real-time Focus Control, during optimum control each time, record participates in the state and data of the equipment of control, complete the summary of optimal data and process, adjusted accordingly to participating in control device and control parameter, realize optimum control;The stable injection control of injection rate, realization needed for the present invention can accurately calculate tracking, reduces fluctuation and error, the coal powder injection reliability of raising blast furnace.

Description

A kind of autocontrol method for bf coal injection system injection amount
Technical field
It is specifically a kind of for the automatic of bf coal injection system injection amount the invention belongs to metallurgical automation field Control method.
Background technology
Coke need to be used by being smelted in modern blast furnace, and its effect in blast furnace is to provide the heat of smelting process needs, simultaneously The reducing agent that reducing iron ore needs, and maintain the skeleton of blast furnace stock column (being particularly cohesive zone and its with lower portion) gas permeability. Pulverized coal injection in blast furnace is the anchracite duff or bituminous coal powder or the mixing of both for being directly blown levigate into stove from blast-furnace tuyere Coal dust, is play a part of to provide heat and reducing agent with substitute for coke, so as to reduce coke ratio, reduces pig iron cost.In pulverized coal conveying Computer controlled process in, it is necessary to ensure to reach required injection amount in the defined time, but be ratio in actual production More difficult thing, is that operating personnel are manually operated control injection amount in many situations, when injecting velocity is controlled It can not guarantee the smoothness of speed, cause to do sth. in advance to complete injection amount in the time of setting, or be not reaching to injection amount, to blast furnace Smelt production causes bad influence, faced with this situation, the controlled level in the urgent need to improving coal injection system injection amount, real The stability and reliability of existing injection system automatic spraying amount.
The content of the invention
The invention aims to solve the above problems, it is proposed that a kind of injection amount for bf coal injection system is automatic Control method, accurately calculates injection rate, and the material metage amount and pressure and corresponding adjusting means for being blown tank are analyzed Judge, using fuzzy control theory and pid control mode, rational analyze data and adjusting means is entered by set amount in time Line trace is controlled, and real-time tracking injecting velocity amount state realizes stable injection amount
A kind of autocontrol method for bf coal injection system injection amount, including following steps:
Step one:Obtain accurate injection rate;
Step 2:Tracing control injection rate is adjusted using PID;
Step 3:After above-mentioned control injection rate process error fluctuation is completed, the attention during real-time Focus Control Item, during optimum control each time, record participates in the state and data of the equipment of control, completes optimal data and mistake The summary of journey, adjusts accordingly to participating in control device and control parameter, realizes optimum control;
The advantage of the invention is that:
(1) injection rate needed for tracking can accurately be calculated;
(2) stable injection control is realized, reduces fluctuation and error;
(3) manpower and materials are greatlyd save;
(4) the coal powder injection reliability of blast furnace is improved.
Brief description of the drawings
Fig. 1 scenes and tank blowing operation interface;
Fig. 2 is flow chart of the method for the present invention.
Embodiment
Below in conjunction with drawings and examples, the present invention is described in further detail.
Coal injection system of blast furnace equipment is generally comprised:Pulverized Coal Bin, injection tank, injection tank baiting valve, are blown tank electronic scale, Diffusion valve, equalizer valve fluidizes valve, and aeration valve, defeated coal valve, pressurising regulating valve fluidizes regulating valve, and tonifying Qi regulating valve, filter divides Orchestration, spray gun etc., coal dust is from coal-storage pot is transported to blast furnace by above equipment.Design general using simultaneously in coal injection system Tank is blown, and realizes the uninterrupted pulverized coal conveying of the continuous tank switching of two tanks into blast furnace, as shown in figure 1, being scene and tank blowing operation circle , there is conventional system of blast furnace injection control device in face in operation interface:Pulverized Coal Bin, is blown tank, baiting valve, diffusion valve, fluidisation Valve, aeration valve, defeated coal valve, pressurising regulating valve fluidizes the survey for also having field instrument in regulating valve, tonifying Qi regulating valve, operation interface Amount, temperature in tank, pressure and value of weighing show have the required injecting coal quantity and accumulative injecting coal quantity that are calculated by algorithm to show
During automatic coal powder injection, if not according to the Operational Data Analysis at scene, it is impossible to stablize coal powder injection well Speed, is frequently encountered following two situations:1. coal powder injection setting time has been arrived, but accumulative injection amount, which is also not up to coal powder injection, to be set It is fixed;2. accumulative injecting coal quantity has reached that coal powder injection is set, but coal powder injection setting time is also not up to.Therefore it is whole-process automatic steady in progress When determining the programming of coal powder injection, the accurate injection rate and the empirical data collection analysis of early stage of calculating is all necessary step Suddenly.
A kind of autocontrol method for bf coal injection system injection amount, flow is as shown in Fig. 2 including following step Suddenly:
Step one:Obtain accurate injection rate;
In the initial period of control method, in order to realize accurate injection amount, it is necessary to obtain accurate injection speed Rate, this is that the primary of control method is also essential step, in the calculating process of injection rate, completes the real-time of injection tank weight Collection, utilizes computational methods in calculating process, completes reliably interference filter, realizes the calculating of accurate injection rate, just Complete a step of the most critical of control method.
In operation debugging process, by data collection and analysis, by spray cans weight, spray cans pressure fluidizes valve opening, tonifying Qi Valve opening, the calculating of ftercompction valve opening and coal powder injection flow and coal powder injection cumulant links together.In order to obtain accurate injection speed Rate, utilizes the form of array data in program, and in the injection starting stage, each second adopts to the weight data for being blown tank Collection, is put into an aray variable, data and upper one second of sampling is compared, obtains corresponding difference, difference is put into another Aray variable, every five seconds for example clock calculates the average value of a difference, calculates the injection rate in current initial injection stage, array After filling up, by freshly harvested data by oldest data cover.The calculating of injection rate is calculated with this data gathered, thus can Carry out interference filter again, reaches an accurate injection rate.After injection enters the stage for the speed that tends towards stability, PLC collections per second are once blown tank weight (representing sampled value per second with Wn), gather weight W1 within first second, gravimetric value is within second second W2, by that analogy, in order to be able to reach optimal average, is done using every 30 seconds sample magnitudes and once calculated, W1, W2...W30, Weight per second is added (sum that 30 seconds sampled values are represented with Sn), and S30=W1+W2+ ...+W30 ... are by that analogy, per second after 30 seconds An average weight (weighed average per second after 30 seconds is represented with WPn), WP30=S30/30, WP31=S31/ can be obtained 30, and the weight of the accumulative preceding 30S after 31S is S31=W1+W2+ ...+W31-WP30, that is, S31=S30-WP30, pass through This is analogized, preceding 30S per second weight and the average weight for all subtracting upper one second, and the injection tank weight of collection per second is all one Directly add up, eliminate interference and filter.Injection rate is made up of the differential of cumulative weight and cumulative time, instantaneous injection Speed (being represented with Pn) is P31=S31-S30, and P32=S32-S31 ... is added the momentary rate of ten times divided by 10 seconds tired Between timing, the stable speed of comparison (being represented with PJn), PJ41=(P31+P32+ ...+P40)/10, PJ42=(P31+ are just obtained P32+ ...+P42-P41)/10 ... by that analogy.By the data of collection, optimal steady instantaneous value will be calculated in a program. Accurate injection rate can be thus calculated by program, an accurate tracking desired value can be realized, be that program is carried out Relevant device is accurately controlled and laid a good foundation.In the process of implementation, accurate calculation error is compensated program automatically, complete Journey is blown over into stable full-automatic spray.
Step 2:Tracing control injection rate is adjusted using PID;
Complete after accurate injection rate calculates, in order to prevent during instantaneous regulation injecting velocity fluctuation compared with Greatly, the associated adjustment valve for participating in control utilizes fuzzy control theory, in the range of the reasonable adjusting of segmentation gear, is adjusted using PID Tracing control injection rate is saved, minimum reduces the fluctuation of injection rate.
On the premise of accurately injecting velocity is calculated, the decrement of injection tank weight is directly proportional with the size of injecting velocity, Using fuzzy control theory, the fluidisation regulating valve of accurate control coal powder injection flow will be participated in, ftercompction control valve opening increment is divided into seven Shelves:Respectively bear greatly, it is negative small in bearing, zero, just small, center, just small, the aperture of regulating valve is increased to just, is reduced to bear.According to The difference of actual injecting velocity and setting injecting velocity, regulation stall is selected in seven grades, reduces fluidisation regulating valve and ftercompction The scope that regulating valve is adjusted every time, it is to avoid aperture significantly changes the rapid fluctuation brought.
PID controller is made up of proportional unit (P), integral unit (I) and differentiation element (D).It inputs e (t) and output u (t) relation is u (t)=kp [e (t)+1/TI ∫ e (t) dt+TD*de (t)/dt], and the bound integrated in formula is 0 and t respectively Wherein kp is proportionality coefficient, and TI is integration time constant, and TD is derivative time constant.
Deviation:E=pv-sp, wherein, e is deviation, and pv is process values, and sp is setting value, according to process values and setting value it Between deviation situation, be roughly divided into following several
1:If actual injection rate is more than the 50% of setting injection rate, it is adjusted in honest gear, complete The aperture that the regulating valve of control will be participated in auto-programming directly reaches honest gear, in honest gear, passes through this shelves The program of position, by PID ratio Kp, integrates TI regulation parameters, carries out undisturbed regulation, due in the actual injection speed of honest gear Rate and setting injection rate overgauge are larger, focus on proportion adjustment in this gear, Kp proportionality coefficients gradually increase, integral adjustment Help out, TI numerical value is smaller.
2:When reaching positive middle gear, the fluidisation regulating valve of control and opening for ftercompction regulating valve will be participated in full auto-programs Degree directly reaches the gear of center, and autocatalytic reset action increase gradually increases integrated value, and Proportional coefficient K p reduces, finally reached To just small gear,
3:If actual injection rate is less than the 50% of setting injection rate, here it is negative big gear, now need by The aperture of the fluidisation regulating valve and ftercompction regulating valve that participate in control directly reaches negative big gear, due in the actual spray of negative big gear Blow speed and setting injection rate minus deviation is larger, focus on proportion adjustment in this gear, Kp proportionality coefficients gradually increase, integrate Regulation helps out, and TI numerical value is smaller.
4:When reaching negative middle gear, the fluidisation regulating valve of control and opening for ftercompction regulating valve will be participated in full auto-programs The gear that degree is directly reached in bearing, autocatalytic reset action increase gradually increases integrated value, and Proportional coefficient K p reduces, finally reached To negative small gear.
Undisturbed PID regulations to sum up are carried out in the gear of setting, then treat that speed is moved closer to by real-time tracking difference Afterwards, program real time scan is run, and into just (negative), just (negative) is small, zero program operation block.Realize in program fuzzy control with The combination of PID control, by searching for different gear program segments automatically, reaches most fast most stable of regulation.
Step 3:After above-mentioned control injection rate process error fluctuation task is completed, it is necessary to real-time Focus Control process In the item that should be noted, and make corresponding adjustment, during optimum control each time, record participates in setting for control Standby state and data, completes the summary of experience of optimal data and process, is carried out accordingly to participating in control device and control parameter Adjustment, realizes optimum control.
It should be noted that 1. are less than setting injection rate 30%, it is necessary to increase when actual injection rate in control process Aeration valve valve seat opening, on the contrary reduce, and the actual conditions of each field apparatus are different, so regulation is first in the range of empirical value Choosing;2. under certain jetting pressure, this pressure needs coal amount and tank body pressure manually to be set in operation interface according to blast furnace is actual Set scope, it is ensured that the stabilization of source of the gas, stabilization fluid nitrogen amount and compressed air air compensation are also very crucial;3. ftercompction regulating valve Aperture declines, and injection tank pressure can decline therewith, thus should not quick regulation ftercompction regulating valve aperture, regulation aperture model every time Enclose and do not exceed 5%, it is ensured that tank is pressed in fluctuation in smaller range;Also can be tank drops 4. the aperture for fluidizing regulating valve declines A reason, therefore fluidisation regulating valve can be according to the empirical value of manually operated accumulation, and one regulating valve of setting is automatically adjusted During control, prevent that fluidisation regulating valve is fully closed in control process, fluidization disappears, and makes the stable can pressure in self-regulating process, Reduce the fluctuation of injection rate, held stationary injection;5. in the injection process later stage, with the reduction of coal dust amount, control program will Tank pressure is gradually reduced, therefore before full auto-programs execution, the limits pressure up and down of a tank pressure can be set in operation interface Value, it is ensured that pulverized coal flow is steady in automatic control process;6. flow is also by pressure influence before distributor, therefore program will be supervised in real time Survey distributor pressure and tank pressure, it is to avoid tank pressure is less than pressure before distributor, coal dust backflow causes danger, and pressure tank reduces, coal dust Flow also accordingly reduces, and now can gradually increase tank pressure;7. after data sampling analysis, it will fluidize regulating valve for project and make For main adjustment equipment, it plays a key effect for the stabilization of pulverized coal flow and injection rate, can also be set in operation interface The bound aperture of regulating valve is fluidized well;8. the situation of real-time tracking spray cans pressure reduction, is less than setting pressure in spray cans pressure 20%, program automatically in real time open ftercompction regulating valve;9. when tank pressure is basically unchanged, secondary air compensating regulating valve provides Secondary Air Amount, instantaneous coal amount reduces with the increase of secondary air flow, therefore when instantaneous coal amount is higher by 30% than setting injecting coal quantity, Instantaneous coal amount can be reduced by secondary air compensating regulating valve;10. Fluidization wind rate crosses the reduction of ambassador's bottle coal mixing ratio, instantaneous coal amount drop It is low, but fluidized wind is too small, does not have fluidization, just do not have an effect for adjusting instantaneous coal amount yet, therefore program composition At initial stage, according to the actual conditions of Different field, reasonable empirical value is gathered, the minimax open range of fluidisation regulating valve is set It is very crucial.
The setting interval parameter of these certain gears, is to be analyzed by ceaselessly data sampling and live operating personnel What experience was worth to, according to the sampling empirical value at this project scene, automated procedures combination fuzzy control and PID adjust what is performed As a result it is:1. in the case of tank pressure kept stable, tonifying Qi regulating valve is basically stable at 50% or so aperture;2. fluidisation Regulating valve can stablize the aperture 50% or so substantially in the stage being initially blown, when injecting velocity is substantially close to stationary value When, it can stablize 30% or so, highest can be to 40% sometimes;3. ftercompction regulating valve can be maintained in the initially injection stage In 10%-20% segments, when injecting velocity is close to stationary value, 30% or so aperture can be basically stable at, sometimes most Height can be to 40%;4. in the case where the said equipment ensures stable operation, it is substantially basicly stable that tank is pressed in the injection starting stage In 400KP, after coal powder injection speed is basicly stable, tank pressure can reach 410-420KP;5. the aperture of ftercompction regulating valve is in 10%- When in the range of 40%, basic injecting velocity can also change in the range of the linearisation of the ton hour of 24 ton hour -11;6. fluidisation is adjusted Save valve aperture in the range of 10%-40% when, basic injecting velocity also can the ton hour of 11 ton hour -24 linearisation model Enclose interior change;7. it is in consistent substantially in above-mentioned control stable case to be blown flow waveform with tank corrugating.

Claims (1)

1. a kind of autocontrol method for bf coal injection system injection amount, including following steps:
Step one:Obtain accurate injection rate;
In the injection starting stage, each second is acquired to the weight data for being blown tank, is put into aray variable A, the number of sampling According to being compared upper one second, corresponding difference is obtained, difference is put into aray variable B, every five seconds for example clock calculates the flat of difference Average, calculates the injection rate in current initial injection stage;
Enter the stage for the speed that tends towards stability in injection, PLC collections per second are once blown tank weight Wn, n=1,2 ... ..., for Preceding 30S, obtains W1, W2...W30, and weight per second is added ,+the W30 that obtains S30=W1+W2+ ..., by that analogy, and S31=W2+ ...+ It is per second to obtain an injection tank weighed average WP30=S30/30, by that analogy, WP31=S31/ after W30+W31,30S 30, then the weight of the accumulative preceding 30S after 31S is S31=W1+W2+ ...+W31-WP30, i.e. S31=S30- (WP30-W31), By that analogy, preceding 30S per second weight and a difference is all subtracted, the difference is the average weight and weight of current second of upper one second The difference of amount, injection rate is made up of the differential of cumulative weight and cumulative time, and instantaneous injection rate Pn is expressed as P31= S31-S30, P32=S32-S31, by that analogy, momentary rates addition divided by the cumulative time of 10 seconds ten times obtain steady Speed PJn, PJ41=(P31+P32+ ...+P40)/10, PJ42=(P32+P33+ ...+P41)/10, by that analogy;
By the data of collection, accurate injection rate is obtained, in the process of implementation, accurate calculation error is compensated automatically;
Step 2:Tracing control injection rate is adjusted using PID;
Fluidisation regulating valve, ftercompction control valve opening increment are set to seven grades:Respectively bear greatly, it is negative small in bearing, zero, it is just small, just In, just small, the aperture of regulating valve is increased to just, is reduced to bear, according to actual injecting velocity and setting injecting velocity difference, Regulation stall is selected in seven grades;
Specially:
PID controller is made up of proportional unit P, integral unit I and differentiation element D, and it inputs e (t) and output u (t) relation For u (t)=kp [e (t)+1/TI ∫ e (t) dt+TD*de (t)/dt], the bound integrated in formula is 0 and t respectively, and wherein kp is Proportionality coefficient, TI is integration time constant, and TD is derivative time constant;
If deviation is e=pv-sp, wherein, e is deviation, and pv is process values, and sp is setting value, according to process values and setting value it Between deviation situation, be divided into following several situations:
(1) if actual injection rate is more than the 50% of setting injection rate, it is adjusted in honest gear, will participates in controlling The aperture of the regulating valve of system directly reaches honest gear, in honest gear, by PID Proportional coefficient K p, and integration TI is adjusted Parameter is saved, undisturbed regulation is carried out;
(2) when reaching positive middle gear, the aperture of the fluidisation regulating valve and ftercompction regulating valve that participate in control is directly reached into center Gear, gradually increases integrated value, reduces Proportional coefficient K p, is finally reached just small gear;
(3) if actual injection rate is adjusted less than the 50% of setting injection rate in negative big gear, it will participate in controlling The fluidisation regulating valve of system directly reaches negative big gear with the aperture of ftercompction regulating valve, gradually increases Kp proportionality coefficients, TI integrations Parameter regulation;
(4) when reaching negative middle gear, the aperture of the fluidisation regulating valve and ftercompction regulating valve that participate in control is directly reached in bearing Gear, gradually increases integrated value, and Proportional coefficient K p reduces, and is finally reached negative small gear;
To sum up undisturbed PID regulations, then by real-time tracking difference after speed is moved closer to, journey are carried out in the gear of setting Sequence real time scan is run, and into hitting exactly, bear, just small, negative small, zero program operation block, realizes fuzzy control and PID in program The combination of control, by searching for different gear program segments automatically, reaches most fast most stable of regulation;
Step 3:After above-mentioned control injection rate process error fluctuation is completed, the points for attention during real-time Focus Control, During optimum control each time, record participates in the state and data of the equipment of control, completes optimal data and process Summarize, adjusted accordingly to participating in control device and control parameter, realize optimum control;
Points for attention in control process are:
(1) when actual injection rate is less than setting injection rate 30%, aeration valve valve seat opening is increased, otherwise reduce;
(2) under the jetting pressure of setting, pressure needs coal amount and tank body pressure manually to be set in operation interface according to blast furnace is actual, Stabilization fluid nitrogen amount and compressed air air compensation;
(3) regulation open range is no more than 5% every time;
(4) setting fluidisation regulating valve auto-adjustment control, prevents that fluidisation regulating valve is fully closed;
(5) the bound pressure value of tank pressure is set;
(6) distributor pressure and tank pressure are monitored in real time, it is to avoid tank pressure is less than pressure before distributor, coal dust backflow causes danger;
(7) the bound aperture of setting fluidisation regulating valve;
(8) real-time tracking spray cans pressure, it is automatic to open ftercompction regulation in real time when spray cans pressure is less than the 20% of setting pressure Valve;
(9) when instantaneous coal amount is higher by 30% than setting injecting coal quantity, instantaneous coal amount is reduced by secondary air compensating regulating valve;
(10) according to the actual conditions at scene, the minimax open range of fluidisation regulating valve is set.
CN201510711218.2A 2015-10-28 2015-10-28 A kind of autocontrol method for bf coal injection system injection amount CN105368996B (en)

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CN105734189A (en) * 2016-04-12 2016-07-06 燕山大学 Method for determining coal injection quantity of blast furnace during operation process
CN106906322A (en) * 2017-04-11 2017-06-30 柳州钢铁股份有限公司 Coal powder injection volume automatic regulation method
CN106906323A (en) * 2017-04-11 2017-06-30 柳州钢铁股份有限公司 Blast-furnace coal powder injection process fluidizes control method
CN106893792A (en) * 2017-04-11 2017-06-27 柳州钢铁股份有限公司 Pulverized coal injection autocontrol method
CN106893793A (en) * 2017-04-11 2017-06-27 柳州钢铁股份有限公司 The monitoring method of real-time coal powder injection rate
CN110529871A (en) * 2019-09-02 2019-12-03 大峘集团有限公司 A kind of coal dust dynamic allocator device and its working method

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