CN104977316A - Method for distinguishing trend of content of FeO in sinter - Google Patents
Method for distinguishing trend of content of FeO in sinter Download PDFInfo
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Abstract
The invention discloses a method for distinguishing a trend of content of FeO in sinter. The method comprises the following steps: determining the temperature at a sintering end point of a solid fuel in a material layer according to benchmark data about control on R and FeO in sinter in a PLC; performing sintering process control at the sintering end point; controlling the state of the material layer through the end point position and the end point temperature; determining the physical heat content of the sinter and the temperature of ring cold exhaust gas according to the percentage of fixed carbon in the solid fuel and the control state of the material layer; performing corresponding temperature difference analysis by tracing the temperature of a large flue and the temperature of the ring cold exhaust gas, and prejudging the content of FeO in the sinter; and within a period of time meeting technological requirements at the sintering end point, comparing the trend between the temperature of the sintering flue and the temperature of the ring cold exhaust gas to accurately obtain the change trend of the content of FeO in the sinter during the period of time. According to the method, the trend of the content of FeO in the sinter can be distinguished on line, and the content of FeO in the sinter can be adjusted in advance, thereby reducing the consumption of solid fuels during production and improving the yield of sinter.
Description
Technical field
The present invention relates to a kind of sintering production method, relate to a kind of FeO in Sinter online test method specifically.
Background technology
Sintering allocates each powdery iron-containing material into suitable flux and fuel, mixing after cloth light a fire on pallet exhausting burning, high temperature is produced by the solid-fuelled burning in compound, make the liquid phase producing some in compound, other unfused ferrous material particle bond are got up, after cooling, forms the lump ore of porous.Sinter the dynamic process that whole process is a complicated mechanism, non-linear, transient behavior, multivariate, large time delay, relate to the technological parameters such as temperature, pressure, speed, flow, comprise a large amount of complicated physicochemical change.And FeO is one of most important chemical analysis in sintering deposit, the barrate strength of sintering deposit, low temperature reduction degradation index and reductibility are had a significant impact.Reduce FeO Content in Sinter, the reductibility of sintering deposit can be improved, but too low FeO content can make the strength deterioration of sintering deposit.
In general, the FeO content in sintering deposit, directly has influence on the height of sintering energy consumption, is also one of factor affecting sintered carbon discharge height, affects one of important sources of harmful substance contents in sinter fume especially.
At present at the most of sintering plant of China, the on-line checkingi of FeO in Sinter mainly relies on artificial combining with plant-tail section graphical analysis to judge.Utilize the research that tail cross section of sintering machine image is analyzed sintering quality, mainly to test the FeO in Sinter that draws for foundation, by parameters such as the stomatal size rate calculated in sintering machine tail image and sinter section temperature, by setting up binary linear regression equation, ask the FeO content of sintering deposit.This method comparison is complicated, operation efficiency is low, is also limited by sharpness and the validity of plant-tail section image acquisition simultaneously, thus cannot realizes on-line continuous anticipation FeO in Sinter fast and accurately.
In normal sintering process of producing, the change of every physicochemical condition in the bed of material, all can have an impact to the performance of solid fuel ignition efficiency in the bed of material; This will directly have influence on translational speed and the thickness degree (sintering end point Parameters variation) thereof of zone of combustion in the bed of material, finally can have influence on the difference of the thickness of the red ore bed of plant-tail section, brightness, the porosity.And actual production process and experiment condition difference are comparatively large, experiment condition is less than the disturbing factor of production run, and it does not dynamically judge, so actual judgement can be caused to differ larger with experimental result according to the difference of sintering real process.So only rely on every IR parameters, the physical parameter in the red ore deposit of plant-tail section, and not considering sintering real process, is comparatively accurately rapid anticipation cannot go out content and the variation tendency thereof of FeO in sintering deposit.
For " with magnetic induction coil pick-up unit on-line checkingi sintering mine FeO " publication number, for the technical scheme needs disclosed in the Chinese patent application of CN10275758A, how cover specialized equipment detects denomination of invention, and the accuracy detected can by the impact of site environment, whole cost is higher.
The invention of the Chinese patent application that denomination of invention is CN101082549A for " cracking cabin and detect the method for FeO Content in Sinter " publication number is the temperature level discharged by the sintering deposit after detecting the single roller place fragmentation of sintering, according to this place's temperature number carry out anticipation FeO in Sinter.The method only considers the sintering deposit temperature of unit volume in the sintering unit interval, and do not consider the impact of the change of sintering end point position on sintering deposit unit volume temperature, therefore accuracy can be affected.
Summary of the invention
The object of this invention is to provide a kind of method differentiating FeO in Sinter trend, FeO Content in Sinter trend can be differentiated online, to adjust FeO in Sinter in advance, reduce solid-fuelled consumption in producing, improve Sintering Yield.
The method of differentiation FeO in Sinter trend of the present invention, comprising:
Solid-fuelled sintering end point temperature in the reference data determination bed of material is controlled by R, FeO in the sintering deposit in PLC;
Sintering process control is carried out in sintering end point position;
Material layer state is controlled by final position and terminal temperature;
Fixed carbon number percent and bed of material state of a control determination sintering deposit physics thermal content and the cold exhaust gas temperature of ring contained by solid fuel;
By following the tracks of large flue temperature and the cold exhaust gas temperature of ring, carrying out corresponding temperature gap analysis, going out the content of sintering mine FeO with anticipation;
Meet in the period of technological requirement in sintering end point position, by the trend between contrast sintering flue temperature and the cold exhaust gas temperature of ring, when accurately drawing this in segment limit, the variation tendency of FeO Content in Sinter.
Described temperature gap analysis, is be based upon sintering end point position to meet on technological requirement basis, comprises the following steps:
Meet in the time period of technological requirement in sintering end point position, gather the medial temperature T of large flue
flue average;
Calculate and T
flue averagethe medial temperature T of the cold exhaust gas temperature of the ring that acquisition time is corresponding
the cold average of ringthe delayed t of acquisition time
time difference;
Calculate the cold exhaust gas temperature average of ring and the flue temperature average of this period respectively, obtained the difference DELTA T of ring cold wind temperature degree and large flue temperature by computing
difference;
Carry out the mensuration sintering FeO: temperature gap hourly is carried out comparison-tracking, just can judge sintering mine FeO trend per hour.
The time of Continuous Tracking is t continuous time meeting final position technological requirement
continuous time, its minimum is decided to be 25min, and continuous time is not then analyzed lower than 25min.
The difference of ring cold wind temperature degree and large flue temperature is according to following formulae discovery:
Δ T
difference=T
difference (n+1)-T
difference (n);
Wherein T
difference (n)=T
the cold average of ring-T
flue average(DEG C),
Wherein: T
flue averagemeet the large flue temperature (DEG C) when final position requires,
T
the cold average of ringbe and T
fluecorresponding time t
time differenceunder the cold exhaust gas temperature (DEG C) of ring.
The delayed t of acquisition time
time differenceaccording to following formulae discovery: t
time difference=L/v (min)
Wherein: L---the spacing L(m of flue temperature measurement point and the cold exhaust gas temperature measurement point of ring), V---sintering machine machine speed (m/h).
The content trend of FeO judges according to following formula:
Δ T
difference>=10, be judged as that FeO content increases; Δ T
difference≤ 0, be judged as that FeO content reduces; Δ T
difference<10, is judged as FeO stable content.
The heat that the sintering deposit that a certain section meets sintering end point position produces by the present invention, also the heat that the sintering deposit meeting sintering end point position with the preceding paragraph produces contrasts, namely by the change of contrast sintering deposit leaving energy, namely temperature gap analysis just quicklook can determine the variation tendency of FeO in this period sintering deposit.When not increasing larger input, utilize the data in existing PLC, by the tracking of heat content state contained by the sintering deposit under sintering process state and this state, differentiate FeO Content in Sinter trend online, thus reach and in advance FeO in Sinter is adjusted, to realize reducing solid-fuelled consumption in production, improve Sintering Yield, provide powerful guarantee to cost before reduction iron.
Accompanying drawing explanation
Fig. 1 is sintering machine energy flow chart;
Fig. 2 affects FeO content process flow diagram;
Fig. 3 is the judgement control flow chart of the method sintering mine FeO trend of the differentiation FeO in Sinter trend of one embodiment of the invention.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, below in conjunction with accompanying drawing, the specific embodiment of the present invention is elaborated.First it should be noted that, the present invention is not limited to following embodiment, and the spirit that those skilled in the art should embody from following embodiment is to understand the present invention, and each technical term can do the most wide in range understanding based on Spirit Essence of the present invention.
The method of differentiation FeO in Sinter trend of the present invention is when not increasing larger input, utilize the data in existing PLC, by the tracking of heat content state contained by the sintering deposit under sintering process state and this state, differentiate FeO Content in Sinter trend online, thus reach and in advance FeO in Sinter is adjusted, to realize reducing solid-fuelled consumption in production, improve Sintering Yield, provide powerful guarantee to cost before reduction iron.
Fig. 1 is sintering machine energy flow chart, and as shown in Figure 1, known according to sintering energy balance, the solid fuel in sinter mixture provides the energy import item of about 80%, and sintering deposit physical thermal accounts for again about 40% of sintering energy outlet item.Show according to long-term practical experience, contained by the exhaust gas temperature size that under normal condition, ring cold type goes out and sintering deposit, the size of physical thermal is proportional.
In theory, the FeO content size in sintering deposit, relevant with the decomposition of ferrite.Sintering process temperature (flue temperature) is higher, and ferrite decomposes more abundant, Fe3O4 and the FeO content that Fe2O3 changes into is more, and vice versa.Therefore, as shown in Figure 2, the size of sintering deposit physics thermal content also show the size of FeO Content in Sinter.In sintering process controls, the excellent condition that sintering process controls, adopts sintering end point position to embody usually.Sintering end point temperature is then proportionate with the control benchmark of sintering deposit R, FeO.
Final position moves forward, and shows that bed permeability is excessively good, and the area that effectively utilizes of sintering machine declines on the one hand, and in sintering deposit, liquid phase generates too much on the other hand, and the porosity is little; The final position of reach, can cause sintering deposit with physical thermal be inhaled in a large number in large flue, cause the cold exhaust gas temperature of ring to reduce, be unfavorable for pre-heat recovery.
Otherwise, when stagnant behind final position, in sinter bed, zone of combustion temperature is low, ferrite decomposes insufficient, liquid content also can reduce, and the physical thermal in sintering deposit enters in large flue and will reduce, and under ring cold-blast effect, carbon residue in sintering deposit can be burnt again because contacting with oxygen, and the cold exhaust gas temperature of ring will rise.
Therefore, the change in final position will cause, and different changes appears in FeO Content in Sinter, large flue temperature, the cold temperature of ring.Meet in the period of technological requirement in sintering end point position, trend between contrast sintering flue temperature and the cold exhaust gas temperature of ring, when just accurately can draw this in segment limit, the variation tendency of FeO Content in Sinter, and then can carry out regulating fast and accurately to solid fuel proportioning in advance.
As shown in Figure 2, except final position and terminal temperature determine bed of material state of a control, the principal element simultaneously affecting FeO Content in Sinter also comprises fixed carbon content in solid fuel, and the height of fixed carbon content all directly can cause the change of the content of sintering mine FeO; The fluctuation of the cold exhaust gas temperature of ring can be caused thus.So under operating parameter does not have large change, also by ring cold exhaust gas temperature change histories curve, judge the variation tendency of solid-fuelled physical and chemical performance.
In sum, by the heat that the sintering deposit that a certain section meets sintering end point position produces, also the heat that the sintering deposit meeting sintering end point position with the preceding paragraph produces contrasts, namely by the change of contrast sintering deposit leaving energy, just quicklook the variation tendency of FeO in this period sintering deposit can be determined.
And in sintering deposit leaving energy item, as shown in Figure 1, sintered discharge gas physical thermal accounts for 15.24%, sinter cake physical thermal accounts for 40.63%, these two is all embodied by large flue temperature, terminal temperature, the cold exhaust gas temperature of ring at the scene.And terminal temperature is mainly subject to the impact of sintering deposit R, FeO radix, therefore by following the tracks of large flue temperature and the cold exhaust gas temperature of ring, carrying out corresponding temperature gap analysis, just anticipation can go out the content of sintering mine FeO.
Now a preferred embodiment of the present invention is described in detail, understands the features and advantages of the invention so that clearer.
As shown in Figure 3, temperature gap analysis is adopted when differentiating the method for FeO in Sinter trend.Temperature gap analysis of the present invention, is be based upon sintering end point position to meet on technological requirement basis, namely meets in the time period of technological requirement in sintering end point position, just gathers medial temperature---the T of large flue
flue average.
Because large flue temperature acquisition point position exists certain distance to the collection point of the cold exhaust gas temperature of ring, therefore both medial temperature life period difference t
time difference, so and T
flue averagethe T that acquisition time is corresponding
the cold average of ringthe delayed t of acquisition time
time difference;
The mensuration of sintering FeO, is per hourly get a sample, analyzes, draw the content of sintering mine FeO to the sample that two hours get.So carry out comparison-tracking temperature gap hourly, sintering mine FeO trend per hour just can be judged; And always there is fluctuation in the final position sintering (60min) per hour, the inventive method is then defined as 25min by under the time of Continuous Tracking, namely meeting continuous time of final position technological requirement minimum is 25min, and continuous time is not then analyzed lower than 25min.
Form following each formula thus:
T
flue average---meet the large flue temperature (DEG C) when final position requires
The cold average of T ring---with T
fluecorresponding time t
time differenceunder the cold exhaust gas temperature (DEG C) of ring
1. T
difference (n)=T
the cold average of ring-T
flue average(DEG C)
The difference of ring cold wind temperature degree and large flue temperature
2. Δ T
difference=T
difference (n+1)-T
difference (n)
3. t
time difference=L/V(min)
The spacing L(m of L---flue temperature measurement point and the cold exhaust gas temperature measurement point of ring)
V---sintering machine machine speed (m/h)
T
continuous time---final position meets the duration (min) of technological requirement.
The content trend of FeO judges according to following formula:
Δ T
difference>=10, be judged as that FeO content increases; Δ T
difference≤ 0, be judged as that FeO content reduces; Δ T
difference<10, is judged as FeO stable content.
Technical scheme of the present invention is further illustrated below by way of three FeO content trend analysis examples.
Example under example 1:FeO rising trend
Final position meets the requirements duration t
continuous timebe respectively 26min, 30min, corresponding flue temperature value is respectively T
flue average 1106 DEG C, T
flue average 293 DEG C; The spacing L:32(m of flue temperature measurement point and the cold exhaust gas temperature measurement point of ring), the sintering machine machine speed V:1.6(m/h of this time period);
Formula is utilized 3. to draw t
time differencefor 20mim
T
time difference=L/V=1.6/32=20(min)
Choose the corresponding t of the cold temperature of ring
time differencefor 20min, 20min, corresponding T
the cold average 1 of ringbe 269 DEG C, T
the cold average 2 of ringit is 277 DEG C;
Formula is utilized 1. to calculate T
difference (1)it is 163 DEG C;
T
difference (1)=T
the cold average of ring (1)-T
flue average (1)
＝296—106＝163℃
Formula is utilized 1. to calculate T
difference (2)it is 184 DEG C;
T
difference (2)=T
the cold average of ring (2)-T
flue average (2)
＝277—93＝184℃
Formula is utilized 2. to calculate Δ T
differenceit is 21 DEG C;
Δ T
difference=T
difference (2)-T
difference (1)
＝184—163＝21℃
∵ Δ T
difference=21>=10 DEG C
∴ FeO raises
Actual detection FeO in Sinter is 8.65
Refer to shown in table 1FeO Trend judgement example 1.
Table 1FeO Trend judgement example 1
Example under example 2:FeO reduction trend
Final position meets the requirements duration t
continuous timebe respectively 39min, 33min, corresponding flue temperature value is respectively T
flue average (1)104 DEG C, T
flue average (2)99 DEG C; The spacing L:32(m of flue temperature measurement point and the cold exhaust gas temperature measurement point of ring), the sintering machine machine speed V:1.68(m/h of this time period);
Formula is utilized 3. to draw t
time differencefor 19mim
T
time difference=L/V=32/1.68=19(min)
Choose the corresponding t of the cold temperature of ring
time differencefor 19min, 19min, corresponding T
the cold average 1 of ringbe 263 DEG C, T
the cold average 2 of ringit is 252 DEG C;
Formula is utilized 1. to calculate T
difference (1)it is 159 DEG C;
T
difference (1)=T
the cold average of ring (1)-T
flue average (1)
＝263—104＝159℃
Formula is utilized 1. to calculate T
difference (2)it is 153 DEG C;
T
difference (2)=T
the cold average of ring (2)-T
flue average (2)
＝252—99＝153℃
Formula is utilized 2. to calculate Δ T
differencefor-6 DEG C;
Δ T
difference=T
difference (2)-T
difference (1)
＝153—159＝﹣6℃
∵ Δ T
difference=﹣ 6 < 0 DEG C
∴ FeO reduces
Actual detection FeO in Sinter is 6.86
Refer to shown in table 2FeO Trend judgement example 2.
Table 2FeO Trend judgement example 2
Example under the constant trend of example 3:FeO
Final position meets the requirements duration t
continuous timebe respectively 35min, 30min, corresponding flue temperature value is respectively T
flue average 1108 DEG C, T
flue average 2106 DEG C; The spacing L:32(m of flue temperature measurement point and the cold exhaust gas temperature measurement point of ring), the sintering machine machine speed V:1.5(m/h of this time period);
Formula is utilized 3. to draw t
time differencefor 21mim;
T
time difference=L/V=32/1.5=21(min)
Choose the corresponding t of the cold temperature of ring
time differencefor 18min, 18min, corresponding T
the cold average 1 of ringbe 258 DEG C, T
the cold average 2 of ringit is 262 DEG C;
Formula is utilized 1. to calculate T
difference (1)it is 150 DEG C;
T
difference (1)=T
the cold average of ring (1)-T
flue average (1)
＝258—108＝150℃
Formula is utilized 1. to calculate T
difference (2)it is 158 DEG C;
T
difference (2)=T
the cold average of ring (2)-T
flue average (2)
＝262—106＝158℃
Formula is utilized 2. to calculate Δ T
differenceit is 8 DEG C;
Δ T
difference=T
difference (2)-T
difference (1)
＝150—158＝8℃
∵ Δ T
difference=8 < 10 DEG C
∴ FeO maintains
Actual detection FeO in Sinter is 7.6
Refer to shown in table 3FeO Trend judgement example 3.
Table 3FeO Trend judgement example 3
In sum, the present invention is not when increasing larger input, utilize the data in existing PLC, by the tracking of heat content state contained by the sintering deposit under sintering process state and this state, differentiate FeO Content in Sinter trend online, thus reach and in advance FeO in Sinter is adjusted, with realize reducing produce in solid-fuelled consumption, improve Sintering Yield, provide powerful guarantee to cost before reduction iron.
Should be understood that those skilled in the art can make various changes or modifications the present invention, and these equivalent form of values fall within the application's appended claims limited range equally after having read above-mentioned instruction content of the present invention.
Claims (5)
1. differentiate a method for FeO in Sinter trend, it is characterized in that, comprising:
Solid-fuelled sintering end point temperature in the reference data determination bed of material is controlled by R, FeO in the sintering deposit in PLC;
Sintering process control is carried out in sintering end point position;
Material layer state is controlled by final position and terminal temperature;
Fixed carbon number percent and bed of material state of a control determination sintering deposit physics thermal content and the cold exhaust gas temperature of ring contained by solid fuel;
By following the tracks of large flue temperature and the cold exhaust gas temperature of ring, carrying out corresponding temperature gap analysis, going out the content of sintering mine FeO with anticipation;
Meet in the period of technological requirement in sintering end point position, by the trend between contrast sintering flue temperature and the cold exhaust gas temperature of ring, when accurately drawing this in segment limit, the variation tendency of FeO Content in Sinter.
2. the method for differentiation FeO in Sinter trend according to claim 1, is characterized in that, described temperature gap analysis, is to be based upon sintering end point position to meet on technological requirement basis, and comprises the following steps:
Meet in the time period of technological requirement in sintering end point position, gather the medial temperature T of large flue
flue average;
Calculate and T
flue averagethe medial temperature T of the cold exhaust gas temperature of the ring that acquisition time is corresponding
the cold average of ringthe delayed t of acquisition time
time difference;
Calculate the cold exhaust gas temperature average of ring and the flue temperature average of this period respectively, obtained the difference DELTA T of ring cold wind temperature degree and large flue temperature by computing
difference;
Carry out the mensuration sintering FeO: temperature gap hourly is carried out comparison-tracking, just can judge sintering mine FeO trend per hour.
3. the method for differentiation FeO in Sinter trend according to claim 1, is characterized in that, the time of Continuous Tracking is t continuous time meeting final position technological requirement
continuous time, its minimum is decided to be 25min, and continuous time is not then analyzed lower than 25min.
4. the method for differentiation FeO in Sinter trend according to claim 1, is characterized in that, the difference of ring cold wind temperature degree and large flue temperature is according to following formulae discovery:
Δ T
difference=T
difference(n+1)-T
difference(n);
Wherein T
difference (n)=T
the cold average of ring-T
flue average(DEG C),
Wherein: T
flue averagemeet the large flue temperature (DEG C) when final position requires,
T
the cold average of ringbe and T
fluecorresponding time t
time differenceunder the cold exhaust gas temperature (DEG C) of ring,
The delayed t of acquisition time
time differenceaccording to following formulae discovery: t
time difference=L/V(min),
Wherein: L---the spacing L(m of flue temperature measurement point and the cold exhaust gas temperature measurement point of ring), V---sintering machine machine speed (m/h).
5. the method for differentiation FeO in Sinter trend according to claim 4, is characterized in that, the content trend of FeO judges according to following formula:
Δ T
difference>=10, be judged as that FeO content increases; Δ T
difference≤ 0, be judged as that FeO content reduces; Δ T
difference<10, is judged as FeO stable content.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI687636B (en) * | 2017-10-25 | 2020-03-11 | 日商杰富意鋼鐵股份有限公司 | Sinter ore manufacturing method |
| CN113517037A (en) * | 2021-03-25 | 2021-10-19 | 中南大学 | Method and system for predicting sintering ore FeO by fusing data and knowledge |
| US11187424B2 (en) | 2017-06-15 | 2021-11-30 | Mitsubishi Electric Corporation | Air-conditioning apparatus |
-
2014
- 2014-04-03 CN CN201410133381.0A patent/CN104977316A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11187424B2 (en) | 2017-06-15 | 2021-11-30 | Mitsubishi Electric Corporation | Air-conditioning apparatus |
| TWI687636B (en) * | 2017-10-25 | 2020-03-11 | 日商杰富意鋼鐵股份有限公司 | Sinter ore manufacturing method |
| CN111263822A (en) * | 2017-10-25 | 2020-06-09 | 杰富意钢铁株式会社 | Method for producing sintered ore |
| CN113517037A (en) * | 2021-03-25 | 2021-10-19 | 中南大学 | Method and system for predicting sintering ore FeO by fusing data and knowledge |
| CN113517037B (en) * | 2021-03-25 | 2022-11-15 | 中南大学 | Method and system for predicting sintering ore FeO by fusing data and knowledge |
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