CN105368996A - Automatic injection control method for blast furnace coal injection system - Google Patents

Automatic injection control method for blast furnace coal injection system Download PDF

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Publication number
CN105368996A
CN105368996A CN201510711218.2A CN201510711218A CN105368996A CN 105368996 A CN105368996 A CN 105368996A CN 201510711218 A CN201510711218 A CN 201510711218A CN 105368996 A CN105368996 A CN 105368996A
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control
variable valve
injection rate
gear
pressure
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CN201510711218.2A
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Chinese (zh)
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CN105368996B (en
Inventor
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 an automatic injection control method for a blast furnace coal injection system. The automatic injection control method includes the following steps that firstly, the accurate injection speed is obtained; secondly, the injection speed is adjusted, tracked and controlled through the PID; thirdly, after the injection speed control process error fluctuation task is finished, the notes in the control process are noticed in real time, in the optimum control process each time, the states and data of equipment participating in control are recorded, the optimal data and process are concluded, the equipment participating in control and control parameters are correspondingly adjusted, and optimum control is achieved. By means of the automatic injection control method, the required injection speed can be accurately computed, stable injection control is achieved, the fluctuation and error are reduced, and the coal injection reliability of a blast furnace is improved.

Description

A kind of autocontrol method for bf coal injection system winding-up amount
Technical field
The invention belongs to metallurgical automation field, specifically a kind of autocontrol method for bf coal injection system winding-up amount.
Background technology
Smelt need use coke in modern blast furnace, its effect in blast furnace is to provide the heat that smelting process needs, simultaneously the reductive agent of reducing iron ore needs, and maintains the skeleton of blast furnace stock column (particularly cohesive zone and with lower portion) ventilation property.Pulverized coal injection in blast furnace is from the blast-furnace tuyere pulverized anthracite that directly winding-up is levigate in stove or bituminous coal powder or the mixed coal powder of both, plays a part to provide heat and reductive agent, thus reduces coke ratio, reduce pig iron cost with substitute for coke.In the computer controlled process of pulverized coal conveying, need to ensure to reach required winding-up amount at specific time, but be more difficult thing in actual production, that operator manually operate and control winding-up amount in a lot of situation, the smoothness of speed is not ensured when controlling injecting velocity, cause and complete winding-up amount ahead of time in the time of setting, or do not reach winding-up amount, bad impact is caused on blast-furnace smelting production process, faced with this situation, in the urgent need to improving the level of control of coal injection system winding-up amount, realize stability and the reliability of injection system automatic spraying amount.
Summary of the invention
The object of the invention is to solve the problem, propose a kind of winding-up amount autocontrol method for bf coal injection system, accurate calculation injection rate, carry out analysis to the winding-up material metage amount of tank and the setting device of pressure and correspondence to judge, utilize fuzzy control theory and pid control mode, rational analytical data and carry out follow-up control by set amount to setting device in time, real-time follow-up injecting velocity amount state, realizes stable injection amount
For an autocontrol method for bf coal injection system winding-up amount, comprise following step:
Step one: obtain accurate injection rate;
Step 2: utilize PID to regulate follow-up control injection rate;
Step 3: after completing the fluctuation of above-mentioned control injection rate process error, precaution in real-time Focus Control process, in optimum control process each time, record participates in state and the data of the equipment controlled, complete the summary of optimal data and process, participation operating device and controling parameters are adjusted accordingly, realizes optimum control;
The invention has the advantages that:
(1) the required injection rate of tracking can be calculated accurately;
(2) realize stable winding-up to control, reduce fluctuation and error;
(3) greatly use manpower and material resources sparingly;
(4) the coal powder injection reliability of blast furnace is improved.
Accompanying drawing explanation
The on-the-spot also tank blowing operation interface of Fig. 1;
Fig. 2 is method flow diagram of 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 generally comprises: Pulverized Coal Bin, winding-up tank, winding-up tank baiting valve, winding-up tank electronic scale, diffusion valve, equalizer valve, fluidisation valve, aeration valve, defeated coal valve, pressurising variable valve, fluidisation variable valve, tonifying Qi variable valve, strainer, divider, spray gun etc., coal dust is transported to blast furnace from coal-storage pot through above equipment.In coal injection system, design is general adopts and tank winding-up, realize the uninterrupted pulverized coal conveying of the continuous tank switching of two tanks in blast furnace, as shown in Figure 1, for scene and tank blowing operation interface, operation interface has conventional system of blast furnace injection operating device: Pulverized Coal Bin, winding-up tank, baiting valve, diffusion valve, fluidisation valve, aeration valve, defeated coal valve, pressurising variable valve, fluidisation variable valve, tonifying Qi variable valve, operation interface also has the measurement of field instrument, temperature in tank, pressure and value display of weighing, have injecting coal quantity needed for being calculated by algorithm and accumulative injecting coal quantity to show
In the process of automatic coal powder injection, if not according to the Operational Data Analysis at scene, can not well stablize coal powder injection speed, often can run into following two kinds of situations: 1. coal powder injection setting-up time arrives, but accumulative winding-up amount does not also reach coal powder injection setting; 2. accumulative injecting coal quantity has reached coal powder injection setting, but coal powder injection setting-up time does not also reach.Therefore, when carrying out the programming of whole-process automatic stable coal powder injection, the accurate rule of thumb data collection analysis calculating injection rate and early stage is all necessary step.
For an autocontrol method for bf coal injection system winding-up amount, flow process as shown in Figure 2, comprises following step:
Step one: obtain accurate injection rate;
At the initial period of control method, in order to realize accurate injection amount, accurate injection rate must be obtained, this is the primary of control method is also essential step, in the computation process of injection rate, completes the Real-time Collection of winding-up tank weight, method of calculation are utilized in computation process, complete reliably interference filter, realize the calculating of accurate injection rate, just complete a step of the most critical of control method.
In operation debug process, by data collection and analysis, by spray cans weight, spray cans pressure, fluidisation valve opening, aeration valve aperture, the calculating of pressure-supplementing valve aperture and coal powder injection flow and coal powder injection semi-invariant links together.In order to obtain accurate injection rate, in program, utilize the form of array data, in the winding-up starting stage, p.s., the weight data to winding-up tank gathered, put into an array variable, sampling data and compared upper one second, obtain corresponding difference, difference put into another array variable, calculate the mean value of a difference every 5 seconds, calculate the injection rate in current initial winding-up stage, after array is filled up, by the data that newly gather by the oldest data cover.The calculating of injection rate calculates with these data gathered, and so just can carry out interference filter again, reach an accurate injection rate.After winding-up enters the stage of the speed that tends towards stability, PLC collection per second is once jetted tank weight (representing sampled value per second with Wn), within first second, gather weight W1, second second gravimetric value is W2, by that analogy, in order to best mean number can be reached, adopt every 30 seconds sample magnitude to do once to calculate, W1, W2...W30, weight per second is added (with Sn represent 30 seconds sampled values and), S30=W1+W2+ ... + W30, by that analogy, after 30 seconds, per secondly can obtain a weight in average (representing the weighed average per second after 30 seconds with WPn), WP30=S30/30, WP31=S31/30, and the weight adding up front 30S after 31S is S31=W1+W2+ ... + W31-WP30, namely S31=S30-WP30, analogized by this, the weight of front 30S per second and all subtract the weight in average of upper one second, and the winding-up tank weight of collection per second adds up all always, eliminate interference and filtering.Injection rate is made up of the differential of cumulative weight and cumulative time, instantaneous injection rate (representing with Pn) is P31=S31-S30, P32=S32-S31, the momentary rate of ten times is added the cumulative time divided by 10 seconds, just more stable speed (representing with PJn) is obtained, PJ41=(P31+P32+ ... + P40)/10, PJ42=(P31+P32+ ... + P42-P41)/10 ... by that analogy.By the data will gathered in a program, calculate optimum steady momentary value.So just go out accurate injection rate by program computation, an accurate tracking target value can be realized, for program carries out controlling accurately to lay a good foundation to relevant device.In the process of implementation, accurate miscalculation, carries out auto-compensation to program, completes stable full-automatic spray and blows over journey.
Step 2: utilize PID to regulate follow-up control injection rate;
After completing accurate injection rate and calculating, in order to prevent injecting velocity fluctuation in instantaneous regulate process larger, the associated adjustment valve participating in controlling utilizes fuzzy control theory, within the scope of the reasonable adjusting of segmentation gear, PID is utilized to regulate follow-up control injection rate, the fluctuation of minimum reduction injection rate.
Under the prerequisite of accurate calculation injecting velocity, the reduction of winding-up tank weight is directly proportional with the size of injecting velocity, utilizes fuzzy control theory, the fluidisation variable valve accurately controlling coal powder injection flow will be participated in, ftercompction control valve opening increment is divided into seven grades: be respectively negative large, in negative, negative little, zero, just little, center, just little, the aperture of variable valve is just increased to, and is reduced to negative.According to the difference of actual injecting velocity and setting injecting velocity, in seven grades, select regulation stall, reduce the scope that fluidisation variable valve and ftercompction variable valve regulate at every turn, avoid aperture significantly to change the rapid fluctuation brought.
PID controller is made up of proportional unit (P), integral unit (I) and differentiation element (D).Its input e (t) is u (t)=kp [e (t)+1/TI ∫ e (t) dt+TD*de (t)/dt] with the pass of output u (t), in formula the bound of integration be respectively 0 and t wherein kp be scale-up factor, 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 set(ting)value, according to the deviation situation between process values and set(ting)value, is roughly divided into following several
1: if actual injection rate is greater than 50% of setting injection rate, then regulate at honest gear, in full auto-programs, the aperture participating in the variable valve controlled directly is reached honest gear, in honest gear, by the program of this gear, by PID ratio Kp, integration TI regulating parameter, carry out undisturbed adjustment, due to comparatively large with setting injection rate plus deviation at the actual injection rate of honest gear, in this gear, focus on proportion adjustment, Kp scale-up factor increases gradually, integral adjustment helps out, and TI numerical value is less.
2: when reaching center gear, the aperture participating in fluidisation variable valve and the ftercompction variable valve controlled directly is reached the gear of center in full auto-programs, autocatalytic reset action increases, and increase integrated value gradually, Proportional coefficient K p reduces, and finally reaches just little gear,
3: if actual injection rate is lower than 50% of setting injection rate, Here it is bears large gear, the aperture participating in fluidisation variable valve and the ftercompction variable valve controlled now is needed directly to reach negative large gear, due to larger with setting injection rate negative deviation at the negative actual injection rate of large gear, proportion adjustment is focused in this gear, Kp scale-up factor increases gradually, and integral adjustment helps out, and TI numerical value is less.
4: when reaching negative middle gear, in full auto-programs, the aperture participating in fluidisation variable valve and the ftercompction variable valve controlled directly is reached the gear in bearing, autocatalytic reset action increases, and increase integrated value gradually, Proportional coefficient K p reduces, and finally reaches negative little gear.
To sum up setting gear carry out undisturbed PID adjustment, then by real-time follow-up difference after speed moves closer to, program real time scan run, just entering in (bearing), just (bearing) little, the program operation block of zero.Realize the combination that in program, fuzzy control and PID control, by the different gear programsegment of automatic search, reach fast the most stable adjustment.
Step 3: after completing above-mentioned control injection rate process error fluctuation task, the item that must should be noted that in Focus Control process in real time, and make corresponding adjustment, in optimum control process each time, record participates in state and the data of the equipment controlled, complete the summary of experience of optimal data and process, participation operating device and controling parameters are adjusted accordingly, realizes optimum control.
In control process, it should be noted that 1. set injection rate 30% when actual injection rate is less than, need to increase aeration valve valve seat opening, otherwise reduce, the practical situation of each field apparatus are different, so regulating within the scope of empirical value is first-selection; 2. under certain jetting pressure, this pressure manually sets scope according to actual coal amount and the tank body pressure of needing of blast furnace at operation interface, and ensure the stable of source of the gas, stabilization fluid nitrogen amount and pressurized air air compensation are also very crucial; 3. ftercompction control valve opening declines, and injection tank pressure can decline thereupon, does not therefore want the aperture of quick adjustment ftercompction variable valve, and each open range that regulates does not exceed 5%, ensures that tank pressure fluctuates in more among a small circle; 4. the aperture of fluidisation variable valve declines, also can be the reason that tank pressure declines, therefore fluidisation variable valve can according to the empirical value of manual operation accumulation, during a setting variable valve auto-adjustment control, prevent fluidisation variable valve complete shut-down in control process, rheomorphism disappears, and makes to stablize tank pressure in self-regulating process, reduce the fluctuation of injection rate, held stationary is jetted; 5. in the winding-up process later stage, along with the minimizing of coal dust amount, sequence of control will reduce tank pressure gradually, therefore before full auto-programs performs, can set the bound force value of a tank pressure on operation interface, ensure that pulverized coal flow is steady at automatic control process; 6. flow is also by pressure influence before divider, and therefore program wants Real-Time Monitoring divider pressure and tank pressure, and avoid tank pressure to be less than pressure before divider, coal dust refluxes, and causes danger, pressure tank reduction, and pulverized coal flow is corresponding reduction also, now can increase tank pressure gradually; 7. data sampling analyze after, for project using fluidisation variable valve as main regulation equipment, it plays a key effect for pulverized coal flow and the stable of injection rate, also can set the bound aperture of fluidisation variable valve at operation interface; 8. the situation of real-time follow-up spray cans pressure minimizing, is less than 20% of setting pressure at spray cans pressure, and program opens ftercompction variable valve automatically in real time; 9. when tank pressure is substantially constant, secondary air compensating variable valve provides secondary air flow, and instantaneous coal amount reduces along with the increase of secondary air flow, therefore when instantaneous coal amount exceeds 30% than setting injecting coal quantity, also can reduce instantaneous coal amount by secondary air compensating variable valve; 10. Fluidization wind rate crosses the reduction of ambassador's bottle coal ratio of mixture, instantaneous coal amount reduces, but fluidized wind is too small, do not have rheomorphism, also just do not have the effect regulating instantaneous coal amount, the initial stage of therefore programming, according to the practical situation of Different field, gather reasonable empirical value, the minimax open range arranging fluidisation variable valve is also very crucial.
Certainly the setting interval parameter of these gears, obtained by the empirical value of the ceaselessly operator at data sampling analysis and scene, according to the sampling empirical value at this project scene, the result that automatic routine perform in conjunction with fuzzy control and PID adjustment is: 1., when tank pressure kept stable, tonifying Qi variable valve is basically stable at the aperture of about 50%; 2. fluidisation variable valve is in the stage of initial winding-up, substantially can be stabilized in the aperture of about 50%, when injecting velocity is substantially close to stationary value, can be stabilized in about 30%, sometimes the highest can to 40%; 3. ftercompction variable valve is initially being jetted the stage, can maintain 10%-20% segment, when injecting velocity is close to stationary value, can be basically stable at the aperture of about 30%, sometimes the highest can to 40%; 4., when aforesaid device guarantees steady running, tank pressure is basically stable at 400KP substantially in the winding-up starting stage, and after coal powder injection speed is basicly stable, tank pressure can reach 410-420KP; 5., when the aperture of ftercompction variable valve is within the scope of 10%-40%, basic injecting velocity also can change within the scope of the linearizing of 24 tons/hour-11 tons/hours; 6., when the aperture of fluidisation variable valve is within the scope of 10%-40%, basic injecting velocity also can change within the scope of the linearizing of 11 tons/hour-24 tons/hours; 7. jet flow waveform and tank pressure waveform is consistent when above-mentioned control stable case substantially.

Claims (1)

1., for an autocontrol method for bf coal injection system winding-up amount, comprise following step:
Step one: obtain accurate injection rate;
In the winding-up starting stage, p.s., the weight data to winding-up tank gathered, put into array variable A, sampling data and compared upper one second, obtain corresponding difference, difference is put into array variable B, calculates the mean value of a difference every 5 seconds, calculate the injection rate in current initial winding-up stage;
The stage of the speed that tends towards stability is entered in winding-up, PLC collection per second is once jetted tank weight Wn, n=1, 2, for front 30S, obtain W1, W2...W30, weight per second is added, obtain S30=W1+W2+ ... + W30, by that analogy, S31=W2+ ... + W30+W31, after 30S, per secondly all obtain a winding-up tank weighed average WP30=S30/30, by that analogy, WP31=S31/30, the weight of the accumulative front 30S then after 31S is S31=W1+W2+ ... + W31-WP30, i.e. S31=S30-WP30, by that analogy, the weight of front 30S per second and all subtract the weight in average of upper one second, injection rate is made up of the differential of cumulative weight and cumulative time, instantaneous injection rate Pn is expressed as P31=S31-S30, P32=S32-S31, by that analogy, the momentary rate of ten times is added the cumulative time divided by 10 seconds, obtain stable speed PJn, PJ41=(P31+P32+ ... + P40)/10, PJ42=(P31+P32+ ... + P42-P41)/10, by that analogy,
By the data gathered, obtain accurate injection rate, in the process of implementation, accurate miscalculation, carries out auto-compensation;
Step 2: utilize PID to regulate follow-up control injection rate;
Fluidisation variable valve, ftercompction control valve opening increment are set to seven grades: be respectively negative large, in negative, negative little, zero, just little, center, just little, the aperture of variable valve is just increased to, be reduced to negative, according to actual injecting velocity and the difference setting injecting velocity, in seven grades, select regulation stall;
Be specially:
PID controller is made up of proportional unit P, integral unit I and differentiation element D, its input e (t) is u (t)=kp [e (t)+1/TI ∫ e (t) dt+TD*de (t)/dt] with the pass of output u (t), in formula, the bound of integration is 0 and t respectively, wherein kp is scale-up factor, 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 set(ting)value, according to the deviation situation between process values and set(ting)value, is divided into following several situation:
(1) if actual injection rate is greater than 50% of setting injection rate, then regulate at honest gear, the aperture participating in the variable valve controlled directly is reached honest gear, in honest gear, by PID ratio Kp, integration TI regulating parameter, carries out undisturbed adjustment;
(2), when reaching center gear, the aperture participating in fluidisation variable valve and the ftercompction variable valve controlled directly is reached the gear of center, increase integrated value gradually, reduce Proportional coefficient K p, finally reach just little gear;
(3) if actual injection rate is lower than 50% of setting injection rate, then regulate at negative large gear, the aperture participating in fluidisation variable valve and the ftercompction variable valve controlled directly is reached negative large gear, increases Kp scale-up factor gradually, TI integral parameter regulates;
(4), when reaching negative middle gear, the aperture participating in fluidisation variable valve and the ftercompction variable valve controlled directly is reached the gear in bearing, and increase integrated value gradually, Proportional coefficient K p reduces, and finally reaches negative little gear;
To sum up carry out undisturbed PID adjustment at the gear of setting, then by real-time follow-up difference after speed moves closer to, program real time scan runs, enter center, negative in, just little, negative little, the program operation block of zero, realize the combination that in program, fuzzy control and PID control, by the different gear programsegment of automatic search, reach fast the most stable adjustment;
Step 3: after completing the fluctuation of above-mentioned control injection rate process error, precaution in real-time Focus Control process, in optimum control process each time, record participates in state and the data of the equipment controlled, complete the summary of optimal data and process, participation operating device and controling parameters are adjusted accordingly, realizes optimum control;
Precaution in control process are:
(1) when actual injection rate is less than setting injection rate 30%, increase aeration valve valve seat opening, otherwise reduce;
(2) under the jetting pressure of setting, pressure manually sets at operation interface according to actual coal amount and the tank body pressure of needing of blast furnace, stabilization fluid nitrogen amount and pressurized air air compensation;
(3) each open range that regulates is no more than 5%;
(4) set fluidisation variable valve auto-adjustment control, prevent fluidisation variable valve complete shut-down;
(5) the bound force value of tank pressure is set;
(6) Real-Time Monitoring divider pressure and tank pressure, avoid tank pressure to be less than pressure before divider, coal dust refluxes, and causes danger;
(7) the bound aperture of fluidisation variable valve is set;
(8) real-time follow-up spray cans pressure, when spray cans pressure is less than 20% of setting pressure, opens ftercompction variable valve automatically in real time;
(9) when instantaneous coal amount exceeds 30% than setting injecting coal quantity, instantaneous coal amount is reduced by secondary air compensating variable valve;
(10) according to the practical situation at scene, the minimax open range of fluidisation variable 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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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105734189A (en) * 2016-04-12 2016-07-06 燕山大学 Method for determining coal injection quantity of blast furnace during operation process
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
CN106893792A (en) * 2017-04-11 2017-06-27 柳州钢铁股份有限公司 Pulverized coal injection autocontrol method
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
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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CN101921886A (en) * 2010-08-05 2010-12-22 中冶南方工程技术有限公司 Method for controlling coal injecting rate of blast furnace
CN201817501U (en) * 2010-08-05 2011-05-04 中冶南方工程技术有限公司 Coal injection and blowing system for blast furnace
EP2930249A1 (en) * 2012-12-07 2015-10-14 Nippon Steel & Sumikin Engineering Co., Ltd. Method for operating blast furnace and method for producing molten pig iron

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CN101899542A (en) * 2010-08-05 2010-12-01 中冶南方工程技术有限公司 Coal injection system of blast furnace
CN101921886A (en) * 2010-08-05 2010-12-22 中冶南方工程技术有限公司 Method for controlling coal injecting rate of blast furnace
CN201817501U (en) * 2010-08-05 2011-05-04 中冶南方工程技术有限公司 Coal injection and blowing system for blast furnace
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105734189A (en) * 2016-04-12 2016-07-06 燕山大学 Method for determining coal injection quantity of blast furnace during operation process
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
CN106893792A (en) * 2017-04-11 2017-06-27 柳州钢铁股份有限公司 Pulverized coal injection autocontrol method
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
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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