Processing Solutions for Optimum Implementation of Blast Furnace Operation

Сибагатуллин, С. К.; Харченко, А. С.; Beginyuk, V. A.

doi:10.1007/s11015-014-9903-5

Cited by 7 publications

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“…Предложенный метод определения неравномерности распределения материалов по окружности колошника опробовали на доменных печах ОАО «ММК» объемом 2014 и 1370 м 3 . Коэффициент окружной неравномерности (p) предполагалось определить по значениям измеряемых температур периферийного газа под газоотводами (T i , °C).…”

Section: Doi: 1017073/0368-0797-2018-10-766-773unclassified

“…- предельное значение X 2 -статистики, допустимое для определения меры неравномерности. Методика апробирована для оценки относительной неравномерности компонентов загружаемой шихты и распределения окружной температуры на доменных печах ОАО «Магнитогорский металлургический комбинат» объемом 2014 и 1370 м 3 . Выявлено влияние последовательности набора компонентов шихты в бункер бесконусного загрузочного устройства печей на коэффициент окружной неравномерности материалов и технико-экономические показатели плавки.…”

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Evaluation of uneven distribution of charge materials at blast furnace

Сибагатуллин

Харченко

Девятченко

2018

Izv. vysš. učebn. zaved., Čern. metall.

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In various industries, the uneven distribution of material and energy resources significantly affects stability of the technological process and reduces the quality of products. In particular, in the blastfurnace production, the uneven distribution of charge materials and the temperature of gases significantly affect technical and economic performance of the furnace. The analysis of bibliographic sources has shown that for the estimation of unevenness various coefficients were generally used, taking into account the variability of material and ener gy resources in the production process, the coefficient of variation introduced by K. Pierson in 1895 was the most widespread. It was determined the relation between the square of the coefficient of variation of V2 and the value X2= (n(N-1))/N*V2according to which the random variable V2 has X2k a distribution with k degrees of freedom, k = N – 1, where n = n1 + n2 + … + nN, ni is the value of the i-th measurement, i = 1, N – is the number of measurements. The proposed method for estimating the unevenness is based on statistics X2k, and X2also introduced by K. Pearson in 1901 and 1904, respectively. The latter was intended to test the H0-correspondence of the empirical and statistical distribution. The method for determining the circumferential irregularity in the distribution of materials and gases in a blast furnace is based on the consistency of X2k and X2 of Pearson statistics, using the so-called quantile factor q, if in calculations of X2 the valu es of the ,physical quantities themselves are used, by analogy, not the frequency of the measured quantities. In this method, X2-statistic after correction was used to determine the measure of deviation (p) from the uniform distribution, i.e. the unevenness coefficientp = p(X2/k), p є (0; 1 – α), X2k = X2max= qX2 was calculated. In order to reconcile X2 and X2k statistics with the measurements of the physical quantities (temperature, pressure) or materials (granular, gaseous), the X2-statistic must be adjusted so that qX2max≈ X2k(α), X2max с(X21,..., Х2M )where M – is the number of experiments for which the values of X2-statics were determined, X2k(α) – the upper α-quantile of X2k statistic, q – the quantile multiplier, introduced for the correction of the X2-statistic values, X2max– the maximum value of X2-statistic is admissible for determining the measure of non-uniformity.The method was tested to evaluate the relative non-uniformity of the loaded charge components and the distribution of peripheral temperature at blast furnaces of OJSC “MMK” with volume of 2014 and 1370 m3. The influence of the sequence of a set of charge components in the hopper of a bell-less charging device of the furnace on the coefficient of circumferential unevenness (p) and the technical and economic parameters of melting was revealed.

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Section: Doi: 1017073/0368-0797-2018-10-766-773unclassified

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Evaluation of uneven distribution of charge materials at blast furnace

Сибагатуллин

Харченко

Девятченко

2018

Izv. vysš. učebn. zaved., Čern. metall.

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“…Usage of non-conditional coke for blast furnace melting has both positive and negative features. From one side, its introduction in the iron ore mixture (containing sinter and pellets) can improve gas permeability of charge [6][7][8] and intensify the reduction processes if iron oxides [9-11], but from other side, it has negative effect on permeability of coke packing in the furnace hearth [12][13][14], what can be explained by its not complete consumption before the hearth. It is demonstrated especially clear in the furnaces equipped with tray-type compact bellless top (BLT) that can't always provide uniform charge composition around the top throat [15][16][17].…”

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confidence: 99%

Influence of coke nut introduction in blast furnace charge on melting parameters

Chukin¹,

Сибагатуллин²,

Харченко³

et al. 2016

cisisr

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The effect of coke nut introduction in charge material (in the amount 10.9-12.8 kg per ton of hot metal) on operation parameters of blast furnaces with volume 1370 and 2014 m 3 have been established via industrial investigations. These blast furnaces are operating in the conditions of bottom and top areas determining by their gas dynamics. Parameters of gas dynamic conditions, fuel burning, iron reduction from FeO using different reducing agents, furnace thermal operation and hearth drainage capacity are analyzed.

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“…From other side the negative aspects of coke nut and coke fractions using are the following: − quite poor results, connected with great influence of product drainage in the hearth on blast furnace operation [5,11,12]; − the gas permeability of the burden layer [13,14]; − the degree and rate of iron ore recovery [15,16].…”

Section: Introductionmentioning

confidence: 99%

Neural Network Modeling of Coefficient of Burden Resistance to the Gas Movement in the Lower Part of the Blast Furnace in Conditions of Operation with Coke Nut

Сибагатуллин

Харченко

Потапова

2016

MSF

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A mathematical model based on the use of artificial neural networks for forecast of resistance coefficient of burden to the gas at the bottom of the blast furnace with using of coke nut by processing of data array for the OJSC "MMK" blast furnaces (capacity of 1370 m3), equipped with a chute-type bell-less charging device has been created. This test has shown the adequacy of the model to real data. Influence of such factors as characteristics of blast (oxygen content, temperature, natural gas and water steam consumption), iron ore (raw material consumption per time unit, FeO, MgO, Al2O3 content, fraction, basicity), coke (wearability (M10), impact strength (M25), coke strength reactivity (CSR), coke reactivity index (CRI)) on gas dynamics variation at the lower part of the black furnace have been determined. Average relative prediction error does not exceed 0.28 %, the maximum of the sample is 2.82 %. The oxygen content in the blast has the biggest effect on the burden resistance coefficient. When oxygen concentration is more than 25.2 %, the increase of natural gas consumption improves gas-dynamic conditions in the lower part of blast furnace. With the decrease of oxygen content in the blast, the influence of natural gas consumption on coefficient of burden resistance varies in the opposite direction. The reduction of coke wearability (M10) by 0.05 % abs. or the increase of coke strength reactivity (CSR) by 0.14 % abs. has compensated negative effect of coke nut (consumption 4 kg/t of iron) on blast furnace operation.

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Processing Solutions for Optimum Implementation of Blast Furnace Operation

Cited by 7 publications

References 1 publication

Evaluation of uneven distribution of charge materials at blast furnace

Evaluation of uneven distribution of charge materials at blast furnace

Influence of coke nut introduction in blast furnace charge on melting parameters

Neural Network Modeling of Coefficient of Burden Resistance to the Gas Movement in the Lower Part of the Blast Furnace in Conditions of Operation with Coke Nut

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