CN108486361A - A kind of control method of finished ball nodulizing FeO contents - Google Patents
A kind of control method of finished ball nodulizing FeO contents Download PDFInfo
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- CN108486361A CN108486361A CN201810388346.1A CN201810388346A CN108486361A CN 108486361 A CN108486361 A CN 108486361A CN 201810388346 A CN201810388346 A CN 201810388346A CN 108486361 A CN108486361 A CN 108486361A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/02—Roasting processes
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Abstract
The invention discloses a kind of control method of finished ball nodulizing FeO contents, solve the problems, such as to be difficult to FeO contents in accurate, stability contorting finished ball nodulizing in belt type roasting machine technique pellet production process, method includes：Detect different link smoke components in greenball properties index and roasting technique, based on greenball properties index and roasting technique link detection of exhaust gas compositions prediction of result finished ball nodulizing FeO contents, compare the predicted value of finished ball nodulizing FeO contents and actual measurement is worth to and compares deviation, deviation will be compared to make comparisons with set value, roasting technique parameter is adjusted based on comparison result, realizes closed-loop control.The present invention can significantly improve the control accuracy of finished ball nodulizing FeO contents, be stablized in a suitable level, be conducive to improve pellet quality, reduce blast furnace process coke ratio, create apparent economic benefit.
Description
Technical field
The invention belongs to pellet production technical field more particularly to a kind of control methods of finished ball nodulizing FeO contents.
Background technology
Pellet is one of important source material of blast furnace process, and quality good or not has blast furnace ironmaking process and economy
Great influence.FeO contents are to weigh an important indicator of pellet performance, influence blast furnace ironmaking process and coke ratio.Reduce ball
Nodulizing FeO contents are conducive to develop the indirect reduction of blast furnace ironmaking process, improve gas utilization rate, reduce blast furnace coke ratio, improve
Economic benefit.
Pellet is to add water-moistened condition after fine iron breeze or the addition a small amount of additive mixing of other iron content powders
Under, by pelletizer rolling balling, drying roasting, consolidation becomes the ball-type iron content with some strength and metallurgical performance
Raw material.Pellet production process is a combined process, many because being known as of finished ball nodulizing FeO contents is influenced, mainly by original
Material strip part, green-ball manufacture, roasting atmosphere three aspect factor influence, and wherein main body is a roasting oxidation process, key reaction
Fe3O4+1/2O2=Fe2O3、2Feo+1/2O2=Fe2O3, the mechanism of roasting oxidation process is unreacted core model, from dynamics point
Analysis, process speed are directly limited by the size of green-ball grain size.Green-ball manufacture link mainly controls the ratio of grade upper and lower limit
Excessively increase, because≤5mm ratios are excessively high to will have a direct impact on bed permeability, the unit interval is reduced by pelletizing air quantity, oxygen amount,
It is adversely affected to roasting atmosphere, and 16mm is crossed can extend roasting time at high proportion, reduces comprehensive FeO controlled levels.Roasting
It is the key that entire production process, is subdivided into dry, preheating, roasting, wherein dry link theory is that the inside and outside water of green-ball is thorough
Abjection improves self-strength and creates good conditions for follow-up preheating, roasting, and warm is roasting during pelletizing production
Preceding working procedure, main carbonatite of completing decompose and sulfide oxidation precipitation, the CO of precipitation2、SO2Extend out gesture during being scattered to flue gas
Diffusion in oxygen must be influenced, so warm-up phase is to roasting end result；Roasting is the theoretical end point of entire pelletizing oxidation, is whole
It is reacted in a production process the most violent stage, usually the peak of technological control temperature.
Since the factor for influencing finished ball nodulizing FeO contents is numerous, and there is association between each factor influences, and is working as previous existence
In production. art, lack accurate to FeO content's index, science control means, is mostly the personal warp based on technology and operating personnel
It tests and carries out trial and error technical arrangement plan, accuracy is poor, and is susceptible to directionality adjustment mistake, is unfavorable for pellet FeO and contains
The stability contorting of amount.
Invention content
In view of the above-mentioned drawbacks in the prior art, the main purpose of the present invention is to provide a kind of finished ball nodulizing FeO to contain
The control method of amount, in pellet production process, accurate and effective prediction and control being carried out to pellet FeO contents, is made
Pellet FeO contents in desirable level, better meet blast furnace process demand steadily in the long term.
In order to achieve the above object, the present invention adopts the following technical scheme that：A kind of controlling party of finished ball nodulizing FeO contents
Green-ball, drying, preheating and roasting technique section is made in iron ore concentrate raw material by method, and consolidation obtains the finished ball nodulizing, institute
Control method is stated to include the following steps：
1) FeO contents, grade, moisture and the S contents of green-ball are detected；
2) moisture of the flue gas of detection drying process section end outlet；
3) CO in the flue gas of detection pre-heating technique section end outlet2、SO2Content；
4) O in the flue gas of detection roasting technique section end outlet2Content；
5) testing result being based in each step of step 1)~step 4), obtains the estimation FeO contents of finished ball nodulizing；
6) the finished ball nodulizing is detected, the practical FeO contents of the finished ball nodulizing are obtained；
7) the estimation FeO contents of the finished ball nodulizing and practical FeO contents are compared, obtain absolute value of the bias,
It is compared with set deviation, it is determined whether adjust the manufacturing parameter in dry, preheating and roasting technique section.
As a further preference, the detection grade includes：<8mm granularities proportion, 8-16mm granularity proportions
And>16mm granularity proportions.
As a further preference, the method for the estimation FeO contents use includes：By the FeO contents of green-ball, granularity,
Moisture and S contents are denoted as respectively：Parameter a, parameter b, parameter c, parameter d；The moisture of the flue gas of drying process section end outlet contains
Amount is denoted as parameter e；By the CO in the flue gas of pre-heating technique section end outlet2、SO2Content is denoted as parameter f, parameter g respectively；It will roasting
O in the flue gas of firing technique section end outlet2Content is denoted as parameter h；
Obtain estimation FeO contents=0.7344-0.1488a+0.2199b-0.2363c-0.0460e- of finished ball nodulizing
0.0827f+0.0828g+0.1008h+0.3173g*g+0.433a*f-0.374c*e+0.4560c*f+0.2764c*h+
0.2297e*h。
As a further preference, in the step 7), the set deviation is 0.1%, when the absolute value of the bias
When more than 0.1%, the manufacturing parameter adjusted in dry, preheating and roasting technique section is determined.
As a further preference, in the step 7), the production ginseng adjusted in dry, preheating and roasting technique section
Number includes：Dry 10-30 DEG C of wind-warm syndrome is improved, 30-70 DEG C of preheating temperature is improved, improves ten thousand m of roasting air quantity 6-103/ h, raising help
Fire air quantity 700-1200m3/h。
As a further preference, when green-ball is made in iron ore concentrate raw material, the pellet produces in pelletizer, described
Control method further includes：
Differentiate the mineral type of the iron ore concentrate raw material；
Measure the grade of the iron ore concentrate raw material；
Detect the moisture of the iron ore concentrate raw material；
Detect the sulfur content of the iron ore concentrate raw material；
According to type, grade, moisture and the sulfur content of the iron ore concentrate raw material, determine that pelletizer rotating speed and pelletizer incline
Angle.
As a further preference, the mineral type is selected from magnetic iron ore, bloodstone, limonite and siderite；The grain
Grade is 8-16mm.
As a further preference, the grade is the ratio of 8-16mm in 70-90%, the moisture of the iron ore concentrate raw material
Sulfur content for 7-9%, the iron ore concentrate raw material is 0.05-0.3%.
As a further preference, the determining pelletizer rotating speed and pelletizer inclination angle include：The rotating speed of pelletizer is in 5-
It is adjusted within the scope of 7r/min；Pelletizer inclination angle adjusts within the scope of 44-55 °.
As a further preference, the control method further includes：
The chemical composition for measuring the iron ore concentrate raw material obtains the iron ore concentrate moisture content of raw material；
According to the iron ore concentrate moisture content of raw material, the amount of water in the pelletizer is determined
The beneficial effects of the invention are as follows：The present invention passes through detecting step 1) greenball properties index and step 2) -4) roasting work
Different link smoke components, are based on greenball properties index and roasting technique link detection of exhaust gas compositions prediction of result finished ball in skill
Nodulizing FeO contents, compare the predicted value of finished ball nodulizing FeO contents and actual measurement is worth to and compares deviation, will compare deviation
It makes comparisons with set value, the technological parameters such as roasting is adjusted based on comparison result, realize closed-loop control.The present invention can be shown
The control accuracy for improving finished ball nodulizing FeO contents is write, improves 80% or more；Stablized in a suitable level, is had
Conducive to pellet quality is improved, blast furnace process coke ratio is reduced, apparent economic benefit is created.
Description of the drawings
Fig. 1 is the influence relation schematic diagram that material condition controls follow-up Fe0 in present invention method.
Fig. 2 is the unreacted core model schematic diagram of pellet FeO oxidations.
Fig. 3 is the detection of exhaust gas compositions point position view that the embodiment of the present invention uses in pellet production process.
Fig. 4 is finished ball nodulizing FeO content predictions and control logic schematic diagram in present invention method.
Specific implementation mode
The present invention solves belt type roasting machine technological ball by providing a kind of control method of finished ball nodulizing FeO contents
The problem of FeO contents in accurate, stability contorting finished ball nodulizing are difficult in nodulizing production process.
In order to solve drawbacks described above, the main thought of the embodiment of the present invention is：
The control method of finished ball nodulizing FeO contents of the embodiment of the present invention, green-ball is made by iron ore concentrate raw material, using dry
Dry, preheating and roasting technique section, consolidation obtain the finished ball nodulizing, wherein the control method includes the following steps：
1) FeO contents, grade, moisture and the S contents of green-ball are detected；
2) moisture of the flue gas of detection drying process section end outlet；
3) CO in the flue gas of detection pre-heating technique section end outlet2、SO2Content；
4) O in the flue gas of detection roasting technique section end outlet2Content；
5) testing result being based in each step of step 1)~step 4), obtains the estimation FeO contents of finished ball nodulizing；
6) the finished ball nodulizing is detected, the practical FeO contents of the finished ball nodulizing are obtained；
7) the estimation FeO contents of the finished ball nodulizing and practical FeO contents are compared, obtain absolute value of the bias,
It is compared with set deviation, it is determined whether adjust the manufacturing parameter in dry, preheating and roasting technique section.
The FeO contents of green-ball are high, then it represents that the original FeO contents aoxidized are high；Granularity (8-16mm ratios in grade
Example) it is few, then explanation is more more than the ratio of 16mm, and the diameter of green-ball is integrally bigger than normal, and oxygen is bigger than normal to diffusion difficulty inside green-ball, increases
Add the oxidation difficulty of FeO inside green-ball；Green-ball moisture is high, and within the same process time, the time of drying process is just grown, and is used for
The time for carrying out preheating and FeO oxidations is just few, increases FeO and aoxidizes difficulty；The combination energy of ability ratio FeO and oxygen that S is combined with oxygen
Power is strong, and S is first aoxidized, and S contents are high, increases FeO and aoxidizes difficulty.
Moisture in the bellows exiting flue gas of drying process section end represents green-ball in the drying effect of dryer section, water
Divide content low, illustrated thoroughly drying substantially, moisture is high, illustrates still also have a large amount of moisture not have to take off in dry end
It removes, the moisture not removed can carry out continuing to remove into preheating section, and influence should be aoxidized in preheating section FeO.
The CO of pre-heating technique section end bellows outlet2And SO2Content, represent the degree of decomposition of carbonate and the oxidation of S
Degree, if the point has not had or close to no CO2And SO2, illustrate no carbonate and S interference FeO oxidation process, instead
It, if there is more CO2And SO2, then illustrate that the oxidation process of FeO receives interference.
Roasting technique section end bellows export O2Concentration then directly represent the degree of oxidation of FeO, O2Concentration is high, then says
Bright FeO almost complete by oxidation, need not aoxidize consumption O herein2, whereas if O2Concentration is low, then illustrates FeO still big
Amount oxidation does not aoxidize completely in oxidation terminal, and finished ball nodulizing FeO contents will be high.
In summary illustrate, be based on the original FeO contents of green-ball, granularity, green-ball moisture, S content analysis and dryer section end
The CO of moisture, the outlet of pre-heating technique section end bellows in bellows exiting flue gas2And SO2Content, roasting technique section end
Bellows export O2Concentration Testing as a result, estimate finished product FeO contents, be compared with desired value, be according to comparison result judgement
It is no to need to carry out technical arrangement plan, if necessary to adjust, further according to the judgement of each detection parameters need to adjust which or
The technological parameter of several process procedures is for example modified the air quantity in roasting system, wind-warm syndrome, atmosphere, time, machine speed, doses
It adjusts, realizes the accurate adjusting of finished product pellet FeO contents.(atmosphere refers to how much is oxygen content, comes by adjusting combustion air volume
It adjusts；Time refer to green-ball each process section be specially dryer section, preheating section, furnace zone processing time length；Machine speed refers to
The forward speed of belt type roasting machine, by adjusting machine speed may be implemented green-ball each process section residence time adjusting；Doses is
Refer to and enter the weight of the green-ball of belt type roasting machine in the unit interval (per hour), unit is ton/h.)
Control method of the embodiment of the present invention can be used for during belt type roasting machine pelletizing process produces pellet, to pelletizing
Mine FeO contents carry out science, accurate and effective prediction and control, make pellet FeO contents steadily in the long term in desirable level, more
Good meets blast furnace process demand.
The embodiment of the present invention can also manufacture link to green-ball and regulate and control, such as：Detect pelletizing production raw material iron ore concentrate
Key Performance Indicator, according to the partial properties index of iron ore concentrate formed to green-ball manufacture link feedforward, instruct green-ball to manufacture
Link carries out parameter adjustment；
The Key Performance Indicator of above-mentioned iron ore concentrate refers to mineral type, granularity, moisture and S contents etc.；It is above-mentioned according to iron
The partial properties index of concentrate refers to mineral type, granularity and moisture etc.；Above-mentioned green-ball manufacture link parameter specifically refers to make
The rotating speed of ball machine and inclination angle etc..
Mineral type refers to magnetic iron ore, bloodstone, limonite, siderite etc.；Moisture 7-9%, S content 0.05-0.3%.
The rotating speed of pelletizer is adjusted in 5-7r/min ranges, corresponding moisture 7-9%, the low then high rotating speed of moisture, moisture Gao Ze
The slow-speed of revolution；Pelletizer inclination angle is adjusted in 44-55 ° of range, when the ratio of 200 mesh of corresponding granularity is 70-90%, the low then angle of elevation of granularity
Degree, granularity height then low angle；Different minerals type iron ore concentrate hydrophily is different, and low turn is used for the strong iron ore concentrate of hydrophily
Speed, low angle, for the weak iron ore concentrate of hydrophily using high rotating speed, high angle.
In order to which above and other purpose, feature and the advantage of the present invention can be clearer and more comprehensible, number cited below particularly is implemented
Example, to illustrate the control method of finished ball nodulizing FeO contents of the present invention.
Different links in the detection of raw material iron ore concentrate performance indicator, greenball properties Indexs measure and roasting technique in the present embodiment
The content detection of smoke components is all made of conventional method of analysis, it will be understood by those skilled in the art that hereafter repeating no more.
Embodiment 1
During belt type roasting machine pelletizing process produces pellet, iron ore concentrate raw material is made green-ball, drying,
Preheating and roasting technique section, consolidation obtain the finished ball nodulizing.
The embodiment of the present invention by detect pellet raw materials for production iron ore concentrate Key Performance Indicator, with formed to green-ball system
The feedforward for making link instructs green-ball manufacture link to carry out parameter adjustment, and specific steps include：
Step 1：Iron ore concentrate property is analyzed, including：Analyze iron ore concentrate mineral type；Iron ore concentrate chemical property is analyzed, including
Raw material moisture and S contents；Iron ore concentrate physical property is analyzed, the granularity of raw material is included.In the present embodiment 1, detection obtains mineral substance
Type is magnetic iron ore, and granularity is that the ratio of 200 mesh is 86%, moisture 7.8%, and S contents are 0.17%.
Step 2：Analysis result based on iron ore concentrate mineral type and grade forms the feedforward to pelletizing link, according to preceding
Feedback adjustment matching pelletizing operating parameter, including：Pelletizer rotating speed；Pelletizer inclination angle.By the ratio that specification is 8-16mm grade green-balls
Example control is in a certain range.In the present embodiment 1, pelletizer rotating speed is set as 7.2r/min；Pelletizer inclination angle is set as 46 °.
Step 3：Water analysis based on iron ore concentrate matches green-ball manufacturing process as a result, influence of the prediction to pelletizing link
Amount of water, to ensure that granular material being capable of smooth balling-up.
Fig. 1 gives the influence relation schematic diagram that material condition controls follow-up Fe0 in present invention method.This reality
Applying can also be by the sulfur content of detection iron ore concentrate raw material, to instruct the sulfur content of subsequent technique to remove and magnetic iron ore oxidation in example
Degree.
Embodiment 2
During belt type roasting machine pelletizing process produces pellet, iron ore concentrate raw material is made green-ball, drying,
Preheating and roasting technique section, consolidation obtain the finished ball nodulizing.
The embodiment of the present invention is based on green-ball by detecting different link smoke components in greenball properties index and roasting technique
Performance indicator and roasting technique link detection of exhaust gas compositions prediction of result finished ball nodulizing FeO contents, compare finished ball nodulizing FeO
The predicted value of content is worth to actual measurement and compares deviation, will compare deviation and makes comparisons with set value, is based on comparison result pair
The technological parameters such as dry, preheating, roasting are adjusted.Specific steps include：
Step 1：Detect FeO contents, granularity (8-16mm ratios), moisture and the S contents of green-ball.In the present embodiment, detection
It is 29.62% to green-ball FeO contents a, green-ball granularity b is 86.29%, and green-ball moisture c is 8.83%, and green-ball S contents d is
0.22%；
Step 2：The moisture for detecting the flue gas of drying process section end bellows outlet, to examine drying effect；This reality
It applies in example, detects that the moisture e of the flue gas of drying process section end outlet is 0.98%.
Step 3：Detect the CO in the flue gas of pre-heating technique section end bellows outlet2、SO2Content judges pre-heat effect.This
In embodiment, the CO in the flue gas of pre-heating technique section end outlet is detected2Content f is 1.99%, SO2Content g is 42.19；
Step 4：Detect O in the flue gas of roasting technique section end bellows outlet2Content judges the FeO degree in pellet.
In the present embodiment, the O in the flue gas of roasting technique section end outlet is detected2Content h is 18.04%；
Step 5：Based on whole testing results in each step of step 1~step 4, prediction finished ball nodulizing FeO contents are
1.05%.
It is described estimation FeO contents use method include：The FeO contents of green-ball, granularity, moisture and S contents are remembered respectively
For：Parameter a, parameter b, parameter c, parameter d；The moisture of the flue gas of drying process section end outlet is denoted as parameter e；It will preheating
CO in the flue gas of process section end outlet2、SO2Content is denoted as parameter f, parameter g respectively；By roasting technique section end outlet
O in flue gas2Content is denoted as parameter h；
Obtain estimation FeO contents=0.7344-0.1488a+0.2199b-0.2363c-0.0460e- of finished ball nodulizing
0.0827f+0.0828g+0.1008h+0.3173g*g+0.433a*f-0.374c*e+0.4560c*f+0.2764c*h+
0.2297e*h。
Step 6：The predicted value and measured value for comparing finished ball nodulizing FeO contents obtain absolute value of the bias, and set deviation
Value compares.Predict that finished ball nodulizing FeO contents are 1.05%, compared with standard value 0.8%, absolute value is more than 0.1%
Step 7：According to the comparison result of step 6, and the testing result based on step 2~step 4, by improving dry wind
Temperature, preheating temperature, improve roasting air quantity, improve combustion air volume parameter (dry wind-warm syndrome improves 10 DEG C, and preheating temperature improves 30 DEG C,
It roasts air quantity and improves 60,000 m3/ h, combustion air volume improve 700m3/ h), by the moisture e of the flue gas of drying process section end outlet
It is adjusted to 0.76%, by the CO in the flue gas of pre-heating technique section end outlet2Content f be adjusted to 1.62%, SO2Content g adjusts
It is 35.98, by the O in the flue gas of roasting technique section end outlet2Content h is adjusted to be 16.95%, and it is pre- to obtain FeO after adjustment
Measured value is 0.52%, and measured value is 0.56% after adjustment, reaches expected adjustment target.
Fig. 2 is the unreacted core model schematic diagram of pellet FeO oxidations.C in Fig. 20Indicate extraneous oxygen concentration, c1It indicates
Pellet surface oxygen concentration, ceIndicate kernel interface oxygen concentration.
Fig. 3 is the detection of exhaust gas compositions point position view that the embodiment of the present invention uses in pellet production process.
The embodiment of the present invention can significantly improve the control accuracy of finished ball nodulizing FeO contents, stablized and fitted at one
Suitable level is conducive to improve pellet quality, reduces blast furnace process coke ratio, create apparent economic benefit.
Embodiment 3
In pellet actual production process, embodiment 1 is to the state modulator and embodiment 2 of green-ball manufacture link to dry
Dry, preheating, the control of roasting technique parameter can combine, and realize closed-loop control.
Fig. 4 is finished ball nodulizing FeO content predictions and control logic schematic diagram in present invention method.Specific control
Method is similar with embodiment 1 and embodiment 2.
The embodiment of the present invention by detect pellet raw materials for production iron ore concentrate Key Performance Indicator, with formed to green-ball system
The feedforward for making link instructs green-ball manufacture link to carry out parameter adjustment, and specific steps include：
Step 1：Iron ore concentrate property is analyzed, including：Analyze iron ore concentrate mineral type；Iron ore concentrate chemical property is analyzed, including
Raw material moisture and S contents；Iron ore concentrate physical property is analyzed, the granularity of raw material is included.In the present embodiment 1, detection obtains mineral substance
Type is magnetic iron ore, and granularity is that the ratio of 200 mesh is 90%, moisture 9%, and S contents are 0.3%.
Step 2：Analysis result based on iron ore concentrate mineral type and grade forms the feedforward to pelletizing link, according to preceding
Feedback adjustment matching pelletizing operating parameter, including：Pelletizer rotating speed；Pelletizer inclination angle.By the ratio that specification is 8-16mm grade green-balls
Example control is in a certain range.In the present embodiment, pelletizer rotating speed is set as 7r/min；Pelletizer inclination angle is set as 55 °.
Step 3：Water analysis based on iron ore concentrate matches green-ball manufacturing process as a result, influence of the prediction to pelletizing link
Amount of water, to ensure that granular material being capable of smooth balling-up.
The embodiment of the present invention is based on green-ball by detecting different link smoke components in greenball properties index and roasting technique
Performance indicator and roasting technique link detection of exhaust gas compositions prediction of result finished ball nodulizing FeO contents, compare finished ball nodulizing FeO
The predicted value of content is worth to actual measurement and compares deviation, will compare deviation and makes comparisons with set value, is based on comparison result pair
The technological parameters such as dry, preheating, roasting are adjusted.Specific steps include：
Step 1：By detection, detect that green-ball FeO contents a is 29.62%, green-ball granularity b is 86.29%, green-ball water
It is 8.83% to divide c, and green-ball S contents d is 0.22%；
Step 2：By detection, detect that the moisture e of the flue gas of drying process section end outlet is 0.98%；
Step 3：By detection, the CO in the flue gas of pre-heating technique section end outlet is detected2Content f is 1.99%, SO2
Content g is 42.19%；
Step 4：By detection, the O in the flue gas of roasting technique section end outlet is detected2Content h is 18.04%；
Step 5：Each detection data based on step 1-4 utilizes mathematical prediction model estimation FeO contents=0.7344-
0.1488a+0.2199b-0.2363c-0.0460e-0.0827f+0.0828g+0.1008h+0.3173g*g+0.433a*f-
0.374c*e+0.4560c*f+0.2764c*h+0.2297e*h
Predict that finished ball nodulizing FeO contents are 1.05%, compared with standard value 0.8%, absolute value is more than 0.1%；
Step 6：By the dry wind-warm syndrome of raising, preheating temperature, improve roasting air quantity, raising combustion air volume parameter (dry wind
Temperature improves 30 DEG C, and preheating temperature improves 70 DEG C, and roasting air quantity improves 100,000 m3/ h, combustion air volume improve 1200m3/ h), it will dry
The moisture e of the flue gas of process section end outlet is adjusted to 0.66%, by the CO in the flue gas of pre-heating technique section end outlet2
Content f is adjusted to 1.61%, SO2Content g is adjusted to 35.38, by the O in the flue gas of roasting technique section end outlet2Content h tune
Whole is 17.55%, and it is 0.55% that FeO predicted values are obtained after adjustment, and measured value is 0.59% after adjustment, reaches expected adjustment mesh
Mark.
Embodiment 4
In pellet actual production process, the state modulator of link is manufactured to green-ball and to drying, preheating, roasting work
The control of skill parameter can combine, and realize closed-loop control.
The embodiment of the present invention by detect pellet raw materials for production iron ore concentrate Key Performance Indicator, with formed to green-ball system
The feedforward for making link instructs green-ball manufacture link to carry out parameter adjustment, and specific steps include：
Step 1：Iron ore concentrate property is analyzed, including：Analyze iron ore concentrate mineral type；Iron ore concentrate chemical property is analyzed, including
Raw material moisture and S contents；Iron ore concentrate physical property is analyzed, the granularity of raw material is included.In the present embodiment 1, detection obtains mineral substance
Type is magnetic iron ore, and granularity is that the ratio of 200 mesh is 70%, moisture 7%, and S contents are 0.05%.
Step 2：Analysis result based on iron ore concentrate mineral type and grade forms the feedforward to pelletizing link, according to preceding
Feedback adjustment matching pelletizing operating parameter, including：Pelletizer rotating speed；Pelletizer inclination angle.By the ratio that specification is 8-16mm grade green-balls
Example control is in a certain range.In the present embodiment, pelletizer rotating speed is set as 5r/min；Pelletizer inclination angle is set as 44 °.
Step 3：Water analysis based on iron ore concentrate matches green-ball manufacturing process as a result, influence of the prediction to pelletizing link
Amount of water, to ensure that granular material being capable of smooth balling-up.
The embodiment of the present invention is based on green-ball by detecting different link smoke components in greenball properties index and roasting technique
Performance indicator and roasting technique link detection of exhaust gas compositions prediction of result finished ball nodulizing FeO contents, compare finished ball nodulizing FeO
The predicted value of content is worth to actual measurement and compares deviation, will compare deviation and makes comparisons with set value, is based on comparison result pair
The technological parameters such as dry, preheating, roasting are adjusted.Specific steps include：
Step 1：Detect FeO contents, granularity (8-16mm ratios), moisture and the S contents of green-ball.In the present embodiment, detection
It is 29.62% to green-ball FeO contents a, green-ball granularity b is 86.29%, and green-ball moisture c is 8.83%, and green-ball S contents d is
0.22%；
Step 2：The moisture for detecting the flue gas of drying process section end bellows outlet, to examine drying effect；This reality
It applies in example, detects that the moisture e of the flue gas of drying process section end outlet is 0.98%.
Step 3：Detect the CO in the flue gas of pre-heating technique section end bellows outlet2、SO2Content judges pre-heat effect.This
In embodiment, the CO in the flue gas of pre-heating technique section end outlet is detected2Content f is 1.99%, SO2Content g is 42.19；
Step 4：Detect O in the flue gas of roasting technique section end bellows outlet2Content judges the FeO degree in pellet.
In the present embodiment, the O in the flue gas of roasting technique section end outlet is detected2Content h is 18.04%；
Step 5：Based on whole testing results in each step of step 1~step 4, prediction finished ball nodulizing FeO contents are
1.05%.
It is described estimation FeO contents use method include：The FeO contents of green-ball, granularity, moisture and S contents are remembered respectively
For：Parameter a, parameter b, parameter c, parameter d；The moisture of the flue gas of drying process section end outlet is denoted as parameter e；It will preheating
CO in the flue gas of process section end outlet2、SO2Content is denoted as parameter f, parameter g respectively；By roasting technique section end outlet
O in flue gas2Content is denoted as parameter h；
Obtain estimation FeO contents=0.7344-0.1488a+0.2199b-0.2363c-0.0460e- of finished ball nodulizing
0.0827f+0.0828g+0.1008h+0.3173g*g+0.433a*f-0.374c*e+0.4560c*f+0.2764c*h+
0.2297e*h。
Step 6：The predicted value and measured value for comparing finished ball nodulizing FeO contents obtain absolute value of the bias, and set deviation
Value compares.Predict that finished ball nodulizing FeO contents are 1.05%, compared with standard value 0.8%, absolute value is more than 0.1%
Step 7：According to the comparison result of step 6, and the testing result based on step 2~step 4, by improving dry wind
Temperature, preheating temperature, improve roasting air quantity, improve combustion air volume parameter (dry wind-warm syndrome improves 20 DEG C, and preheating temperature improves 50 DEG C,
It roasts air quantity and improves 80,000 m3/ h, combustion air volume improve 900m3/ h), by the moisture e of the flue gas of drying process section end outlet
It is adjusted to 0.76%, by the CO in the flue gas of pre-heating technique section end outlet2Content f be adjusted to 1.62%, SO2Content g adjusts
It is 35.98, by the O in the flue gas of roasting technique section end outlet2Content h is adjusted to be 16.95%, and it is pre- to obtain FeO after adjustment
Measured value is 0.52%, and measured value is 0.56% after adjustment, reaches expected adjustment target.
Technical solution in above-mentioned the embodiment of the present application, at least has the following technical effect that or advantage：
The embodiment of the present invention is based on green-ball by detecting different link smoke components in greenball properties index and roasting technique
Performance indicator and roasting technique link detection of exhaust gas compositions prediction of result finished ball nodulizing FeO contents, compare finished ball nodulizing FeO
The predicted value of content is worth to actual measurement and compares deviation, will compare deviation and makes comparisons with set value, is based on comparison result pair
The technological parameters such as roasting are adjusted, and realize closed-loop control.The present invention can significantly improve the control of finished ball nodulizing FeO contents
Precision is stablized in a suitable level, is conducive to improve pellet quality, reduces blast furnace process coke ratio, creates apparent
Economic benefit.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications may be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the scope of the invention.Obviously, those skilled in the art can be to the present invention
Carry out various modification and variations without departing from the spirit and scope of the present invention.If in this way, these modifications and changes of the present invention
Within the scope of the claims of the present invention and its equivalent technology, then the present invention is also intended to exist comprising these modification and variations
It is interior.
Claims (10)
1. a kind of control method of finished ball nodulizing FeO contents, iron ore concentrate raw material is made green-ball, drying, preheating and
Roasting technique section, consolidation obtain the finished ball nodulizing, it is characterised in that：The control method includes the following steps：
1) FeO contents, grade, moisture and the S contents of green-ball are detected；
2) moisture of the flue gas of detection drying process section end outlet；
3) CO in the flue gas of detection pre-heating technique section end outlet2、SO2Content；
4) O in the flue gas of detection roasting technique section end outlet2Content；
5) testing result being based in each step of step 1)~step 4), obtains the estimation FeO contents of finished ball nodulizing；
6) the finished ball nodulizing is detected, the practical FeO contents of the finished ball nodulizing are obtained；
7) the estimation FeO contents of the finished ball nodulizing and practical FeO contents are compared, obtains absolute value of the bias, and both
Determine deviation to compare, it is determined whether adjust the manufacturing parameter in dry, preheating and roasting technique section.
2. the control method of finished ball nodulizing FeO contents according to claim 1, it is characterised in that：The detection grade
Including：<8mm granularities proportion, 8-16mm granularities proportion and>16mm granularity proportions.
3. the control method of finished ball nodulizing FeO contents according to claim 1, it is characterised in that：The estimation FeO contains
Measuring the method used includes：The FeO contents of green-ball, granularity, moisture and S contents are denoted as respectively：Parameter a, parameter b, parameter c,
Parameter d；The moisture of the flue gas of drying process section end outlet is denoted as parameter e；By the flue gas of pre-heating technique section end outlet
In CO2、SO2Content is denoted as parameter f, parameter g respectively；By the O in the flue gas of roasting technique section end outlet2Content is denoted as ginseng
Number h；
Obtain estimation FeO contents=0.7344-0.1488a+0.2199b-0.2363c-0.0460e- of finished ball nodulizing
0.0827f+0.0828g+0.1008h+0.3173g*g+0.433a*f-0.374c*e+0.4560c*f+0.2764c*h+
0.2297e*h。
4. the control method of finished ball nodulizing FeO contents according to claim 1, it is characterised in that：In the step 7),
The set deviation is 0.1%, when the absolute value of the bias is more than 0.1%, determines and adjusts dry, preheating and roasting technique
Manufacturing parameter in section.
5. the control method of finished ball nodulizing FeO contents according to claim 1, it is characterised in that：In the step 7),
The adjusting is dried, the manufacturing parameter in preheating and roasting technique section includes：It improves dry 10-30 DEG C of wind-warm syndrome, improve preheating temperature
30-70 DEG C of degree improves ten thousand m of roasting air quantity 6-103/ h, combustion air volume 700-1200m is improved3/h。
6. the control method of finished ball nodulizing FeO contents according to claim 1, it is characterised in that：By iron ore concentrate raw material
When green-ball is made, the pellet produces in pelletizer, and the control method further includes：
Differentiate the mineral type of the iron ore concentrate raw material；
Measure the grade of the iron ore concentrate raw material；
Detect the moisture of the iron ore concentrate raw material；
Detect the sulfur content of the iron ore concentrate raw material；
According to type, grade, moisture and the sulfur content of the iron ore concentrate raw material, pelletizer rotating speed and pelletizer inclination angle are determined.
7. the control method of finished ball nodulizing FeO contents according to claim 6, it is characterised in that：The mineral type
Selected from magnetic iron ore, bloodstone, limonite and siderite；The grade is 8-16mm.
8. the control method of finished ball nodulizing FeO contents according to claim 7, it is characterised in that：The grade is 8-
The ratio of 16mm is in 70-90%, and the moisture of the iron ore concentrate raw material is 7-9%, and the sulfur content of the iron ore concentrate raw material is 0.05-
0.3%.
9. the control method of the finished ball nodulizing FeO contents according to claim 6 or 8, it is characterised in that：The determination is made
Ball machine rotating speed and pelletizer inclination angle include：The rotating speed of pelletizer adjusts within the scope of 5-7r/min；Pelletizer inclination angle is at 44-55 °
Adjustment in range.
10. the control method of finished ball nodulizing FeO contents according to claim 6, it is characterised in that：The control method
Further include：
The chemical composition for measuring the iron ore concentrate raw material obtains the iron ore concentrate moisture content of raw material；
According to the iron ore concentrate moisture content of raw material, the amount of water in the pelletizer is determined.
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| CN113628171A (en) * | 2021-07-19 | 2021-11-09 | 北京科技大学 | Pellet production method and device based on machine vision and data driving |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104328276A (en) * | 2014-10-15 | 2015-02-04 | 中冶长天国际工程有限责任公司 | Method of controlling solid fuel in sintering process, device and system |
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2018
- 2018-04-26 CN CN201810388346.1A patent/CN108486361B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104328276A (en) * | 2014-10-15 | 2015-02-04 | 中冶长天国际工程有限责任公司 | Method of controlling solid fuel in sintering process, device and system |
Non-Patent Citations (1)
| Title |
|---|
| 邱波等: ""基于神经网络的FeO氧化系数软测量方法"", 《控制工程》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113628171A (en) * | 2021-07-19 | 2021-11-09 | 北京科技大学 | Pellet production method and device based on machine vision and data driving |
| CN113628171B (en) * | 2021-07-19 | 2023-09-19 | 北京科技大学 | Pellet production method and device based on machine vision and data driving |
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