阅读说明：本技术 一种高炉布料方法 (Blast furnace material distribution method ) 是由 赵满祥 张勇 王耀祖 贾国利 刘征建 宋少华 罗德庆 杨晓婷 于 2021-07-28 设计创作，主要内容包括：本发明公开了一种高炉布料方法,所述方法包括,获得烧结矿的低温还原粉化指数RDI；根据所述烧结矿的低温还原粉化指数RDI,获得所述的烧结矿的目标边缘煤气分布指数；获得所述烧结矿即将入炉时高炉的实际边缘煤气分布指数；比较所述实际边缘煤气分布指数和所述目标边缘煤气分布指数；根据所述比较结果,对所述烧结矿和焦炭进行布料调整。通过实际的煤气分布指数与目标边缘煤气分布指数进行比较来指导铁矿石布料,为辨别确定铁矿石低温还原粉化指数与炉顶目标煤气分布的匹配程度提供了参考依据,很好地指导了高炉操作调整方向,达到炉况顺行与煤气利用率的兼顾平衡的理想生产状态。(The invention discloses a blast furnace burden distribution method, which comprises the steps of obtaining a low-temperature reduction degradation index RDI of a sinter; obtaining a target edge coal gas distribution index of the sinter according to the low-temperature reduction degradation index RDI of the sinter; obtaining the actual edge coal gas distribution index of the blast furnace when the sintered ore is about to enter the furnace; comparing the actual edge gas distribution index with the target edge gas distribution index; and according to the comparison result, carrying out material distribution adjustment on the sintered ore and the coke. The distribution of the iron ore is guided by comparing the actual gas distribution index with the target edge gas distribution index, a reference basis is provided for identifying and determining the matching degree of the low-temperature reduction degradation index of the iron ore and the target gas distribution of the furnace top, the operation adjustment direction of the blast furnace is well guided, and an ideal production state with balanced furnace condition smoothness and gas utilization rate is achieved.)

1. A blast furnace burden distribution method is characterized by comprising the following steps,

obtaining the low-temperature reduction degradation index RDI of the sinter;

obtaining a target edge coal gas distribution index of the sinter according to the low-temperature reduction degradation index RDI of the sinter;

obtaining the actual edge coal gas distribution index of the blast furnace when the sintered ore is about to enter the furnace;

comparing the actual edge gas distribution index with the target edge gas distribution index;

and according to the comparison result, carrying out material distribution adjustment on the sintered ore and the coke.

2. The blast furnace burden distribution method according to claim 1, wherein the target edge gas distribution index of the sintered ore is obtained from the low temperature reduction degradation index RDI of the sintered ore, comprising,

substituting the low-temperature reduction degradation index RDI of the sinter into a relational expression to obtain a target edge coal gas distribution index of the sinter, wherein the relational expression is as follows:

and RDI is-a multiplied by B + c, wherein a is 0.1-0.63, c is 68-75, and B represents a target edge coal gas distribution index.

3. The blast furnace burden distribution method according to claim 2, wherein the target edge gas distribution index is any one of: the difference value delta eta co of the highest value of the utilization rate of the radial carbon monoxide of the blast furnace throat charge level and the utilization rate of the carbon monoxide of the edge part, and the difference value delta Ttop of the temperature of the radial coal gas of the blast furnace throat charge level and the temperature of the coal gas of the edge part.

4. The blast furnace burden distribution method according to claim 3, wherein when the target edge gas distribution index is Δ η co, a in the relation is 0.60-0.63, and c is 68-75.

5. The blast furnace burden distribution method according to claim 4, wherein a is 0.6238, and c is 70.

6. The blast furnace burden distribution method according to claim 3, wherein when the target edge gas distribution index is the Δ Ttop, a is 0.1-0.2, and c is 74-75 in the relational expression.

7. The blast furnace burden distribution method of claim 6, wherein a is 0.1085 and c is 74.5.

8. The blast furnace burden distribution method according to claim 1, wherein the burden distribution adjustment of the sintered ore and the coke according to the comparison result comprises,

when the actual edge gas distribution index is smaller than the target edge gas distribution index, the sintered ore and coke distribution is adjusted to be distributed along the dredging edge;

and when the actual edge gas distribution index is larger than the target edge gas distribution index, the sintered ore and coke distribution is adjusted to be in a direction of weighting edge distribution.

9. The blast furnace burden distribution method according to claim 1, wherein the grain size of the sintered ore is 5-50 mm, and the binary basicity of the sintered ore is 1.7-2.3.

10. The blast furnace burden distribution method according to claim 1, characterized in that the capacity of the blast furnace is 500-5500 m³。

Technical Field

The invention belongs to the technical field of blast furnace ironmaking, and particularly relates to a blast furnace material distribution method.

Background

Blast furnace ironmaking accounts for more than 95% of pig iron output in the world, so that the method has important significance for research and optimization of blast furnace ironmaking procedures. The blast furnace burden, particularly the sinter and the pellet are subjected to high-temperature reactions such as reduction, softening, melting and the like from top to bottom in the blast furnace, wherein the sintering ore and the pellet are easy to crack and pulverize due to low-temperature reduction at 400-600 ℃, and the root cause is Fe₂O₃Lattice transformation occurs during the reduction process. The low-temperature reduction degradation of the iron ore to a certain degree causes the air permeability of a material layer to be reduced, the pressure difference of the blast furnace to be increased, the coal gas utilization rate to be increased, but the too high low-temperature reduction degradation of the iron ore influences the smooth operation of the blast furnace, and even causes the difficult operation and suspension of the blast furnace.

At present, because the quality of iron ore raw materials is uneven, the quality and distribution of iron ore can influence the gas distribution at the top of a blast furnace, the air permeability and the gas utilization rate of the blast furnace are influenced, and the current distribution method cannot deal with the raw materials with large quality fluctuation, so that the air permeability of the blast furnace is deteriorated, and the smooth operation of the blast furnace is influenced.

Disclosure of Invention

In order to solve the technical problems, the invention provides a blast furnace material distribution method which can be used for simply and quickly guiding the adjustment direction and amplitude of the distribution of the top gas and is beneficial to balancing and balancing the smooth running of the blast furnace and reducing the fuel ratio of the blast furnace.

The invention provides a blast furnace burden distribution method, which comprises the following steps,

obtaining the low-temperature reduction degradation index RDI of the sinter;

obtaining a target edge coal gas distribution index of the sinter according to the low-temperature reduction degradation index RDI of the sinter;

obtaining the actual edge coal gas distribution index of the blast furnace when the sintered ore is about to enter the furnace;

comparing the actual edge gas distribution index with the target edge gas distribution index;

and according to the comparison result, carrying out material distribution adjustment on the sintered ore and the coke.

Further, obtaining a target edge gas distribution index of the sintered ore according to the low-temperature reduction degradation index RDI of the sintered ore, including,

substituting the low-temperature reduction degradation index RDI of the sinter into a relational expression to obtain a target edge coal gas distribution index of the sinter, wherein the relational expression is as follows:

and RDI is-a multiplied by B + c, wherein a is 0.1-0.63, c is 68-75, and B represents a target edge coal gas distribution index.

Further, the target edge gas distribution index is any one of the following: the difference value delta eta co of the highest value of the utilization rate of the radial carbon monoxide of the blast furnace throat charge level and the utilization rate of the carbon monoxide of the edge part, and the difference value delta Ttop of the temperature of the radial coal gas of the blast furnace throat charge level and the temperature of the coal gas of the edge part.

Further, when the target edge coal gas distribution index is delta eta co, the value of a in the relational expression is 0.60-0.63, and the value of c is 68-75.

Further, the value of a is 0.6238, and the value of c is 70.

Further, when the target edge coal gas distribution index is the delta Ttop, the value of a is 0.1-0.2, and the value of c is 74-75 in the relational expression.

Further, the value of a is 0.1085, and the value of c is 74.5.

Further, the adjusting the burden distribution of the sintered ore and the coke according to the comparison result specifically comprises,

when the actual edge gas distribution index is smaller than the target edge gas distribution index, the sintered ore and coke distribution is adjusted to be distributed along the dredging edge;

and when the actual edge gas distribution index is larger than the target edge gas distribution index, the sintered ore and coke distribution is adjusted to be in a direction of weighting edge distribution.

Further, the grain size of the sintered ore is 5-50 mm, and the binary alkalinity of the sintered ore is 1.7-2.3.

Further, the capacity of the blast furnace is 500-5500 m³。

One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:

the invention provides a blast furnace burden distribution method, which comprises the steps of obtaining a low-temperature reduction degradation index RDI of a sinter; obtaining a target edge coal gas distribution index of the sinter according to the low-temperature reduction degradation index RDI of the sinter; obtaining the actual edge coal gas distribution index of the sintered ore when the sintered ore is about to enter the furnace; comparing the actual edge gas distribution index with the target edge gas distribution index; and according to the comparison result, carrying out material distribution adjustment on the sintered ore and the coke. The iron ore distribution is guided by comparing the actual edge gas distribution index with the target edge gas distribution index, the adjustment amount of the distribution is given, a reference basis is provided for distinguishing and determining the matching degree of the low-temperature reduction degradation index of the iron ore and the target gas distribution of the furnace top, the operation adjustment direction of the blast furnace is well guided, and the ideal production state of taking the balance between the smooth operation of the furnace condition and the utilization rate of the gas is achieved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.

Fig. 1 is a process diagram of a blast furnace burden distribution method provided by an embodiment of the invention.

Detailed Description

The present invention will be described in detail below with reference to specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly apparent therefrom. It will be understood by those skilled in the art that these specific embodiments and examples are for the purpose of illustrating the invention and are not to be construed as limiting the invention.

Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control.

Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.

It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.

In order to solve the technical problems, the embodiment of the invention provides the following general ideas:

fig. 1 is a process diagram of a blast furnace burden distribution method according to an embodiment of the present invention, and in combination with fig. 1, the present invention provides a blast furnace burden distribution method, which includes,

s1, obtaining the low-temperature reduction degradation index RDI of the sinter;

the low-temperature reduction degradation index RDI of the sinter can be detected by the national standard method (GBT13241-1991)_+3.15。

S2, obtaining a target edge coal gas distribution index of the sinter according to the low-temperature reduction degradation index RDI of the sinter;

the edge gas distribution index is the distribution data of gas on the cross section of the blast furnace throat, the distribution on the throat surface of the blast furnace is usually used for representing the distribution of the blast furnace gas, and the more uniform the distribution of the blast furnace gas is, the better the utilization of heat energy and chemical energy is, and the lower the fuel consumption of the blast furnace is.

As an implementation mode of the embodiment of the invention, the obtaining of the target edge gas distribution index of the sinter according to the low-temperature reduction degradation index RDI of the sinter comprises the following steps,

substituting the low-temperature reduction degradation index RDI of the sinter into a relational expression to obtain a target edge coal gas distribution index of the sinter, wherein the relational expression is as follows:

and RDI is-a multiplied by B + c, wherein a is 0.1-0.63, c is 68-75, and B represents a target edge coal gas distribution index.

The functional relation formula is obtained through analysis of a large amount of data of blast furnace historical smelting, and the relation formula shows that the low-temperature reduction degradation index of the sintered ore entering the furnace and the edge coal gas distribution index are in a linear negative correlation relationship, when the low-temperature reduction degradation index of the iron ore is reduced (namely degradation tends to be serious), delta eta co or delta Ttop needs to be increased, namely, the coal gas flow at the wall part of the blast furnace is increased by adjusting the burden distribution of the blast furnace, namely, the edge coal gas is developed. At the moment, the temperature of the edge gas rises, the utilization rate of the edge gas falls, and both the temperature and the utilization rate of the edge gas increase the value of delta eta co or delta Ttop, namely, the utilization rate of the gas is properly sacrificed by developing the edge gas, the air permeability of the blast furnace is improved, the pressure difference is reduced, and the smooth operation of the blast furnace is promoted. The unit of B is% or C, and the unit of RDI is%.

As an implementation manner of the embodiment of the present invention, the target edge gas distribution index is any one of the following: the difference value delta eta co of the highest value of the utilization rate of the radial carbon monoxide of the blast furnace throat charge level and the utilization rate of the carbon monoxide of the edge part, and the difference value delta Ttop of the temperature of the radial coal gas of the blast furnace throat charge level and the temperature of the coal gas of the edge part.

As an implementation manner of the embodiment of the invention, when the target edge coal gas distribution index is represented by delta eta co, the value of a can be 0.60-0.63, and the value of c can be 68-75.

As an implementation manner of the embodiment of the invention, when Δ η co is used to represent the target edge gas distribution index, the value of a may be 0.6238, and the value of c may be 70, which may provide a basis for more precise distribution adjustment.

When the target edge gas distribution index is the Δ Ttop, a is 0.1 to 0.2 and c is 74 to 75 in the relational expression.

As an implementation manner of the embodiment of the present invention, a is 0.1085, and c is 74.5.

S3, obtaining the actual edge coal gas distribution index of the sinter when the sinter is about to enter the furnace;

the actual edge gas distribution index can be obtained by a blast furnace top cross temperature measurement system or a furnace top cross gas analysis system. The cross temperature measuring system on the top of the blast furnace is a detection system widely applied to the blast furnace at present, and can measure the temperature distribution of coal gas. In the general measurement process, the center of the cross section of the furnace throat can be used as the center, 4-6 points are averagely taken on the radius, and the gas temperature value and the carbon monoxide utilization rate at the position of the taken point are measured. The actual edge gas distribution index should be selected to correspond to the target edge gas distribution index, that is, when the target edge gas distribution index is characterized by Δ Ttop, the actual edge gas distribution index should also be the actual Δ Ttop, and similarly, when the target edge gas distribution index is characterized by Δ η co, the actual edge gas distribution index should also be the actual Δ η co.

S4, comparing the actual edge gas distribution index with the target edge gas distribution index;

and S5, according to the comparison result, adjusting the burden distribution of the sintered ore and the coke.

As an implementation manner of the embodiment of the present invention, the adjusting the cloth according to the comparison result specifically includes,

s501, when the actual edge gas distribution index is smaller than the target edge gas distribution index, adjusting the sintered ore and coke distribution direction to be leading edge distribution;

s502, when the actual edge gas distribution index is larger than the target edge gas distribution index, the sintered ore and coke distribution is adjusted to be in a weighting edge distribution direction.

When the performance of low-temperature reduction degradation of the sintered ore is poor, and the actual edge coal gas distribution index is smaller than the target edge coal gas distribution index, a material distribution mode with light edge coke load is preferably adopted, so that the actual edge coal gas distribution index is close to the target edge coal gas distribution index, and a good smooth state is obtained under the condition of poor upper air permeability. When the low-temperature reduction degradation performance of the sintered ore is better, the actual edge coal gas distribution index is larger than the target edge coal gas distribution index, and a material distribution mode with heavier edge coke load is suitable to be adopted, so that the actual edge coal gas distribution index approaches to the target edge coal gas distribution index, and better coal gas utilization rate is obtained. By the distribution adjustment, the blast furnace smelting can be smooth and has lower coke ratio.

In addition, the specific means for adjusting the distribution can be flexibly selected by a person skilled in the art according to actual conditions, for example, the distribution can be adjusted by means of increasing the edge ores, decreasing the edge ores, increasing the coke amount, decreasing the coke amount, increasing the distribution angle, decreasing the distribution angle and the like, so as to achieve a better target edge coal gas distribution index.

As an implementation manner of the embodiment of the invention, the grain size of the sintered ore is 5-50 mm, and the binary alkalinity of the sintered ore is 1.7-2.3.

As an embodiment of the invention, the capacity of the blast furnace is 500-5500 m³。

A method for operating a blast furnace according to the present invention to match the RDI index of iron ore will be described in detail with reference to examples, comparative examples and experimental data.

Example 1

A cross gas analysis system is used by a blast furnace of a certain factory to collect the distribution condition of the top gas. Due to the change of resource conditions, the low-temperature reduction degradation index measured by the national standard method of the furnace entering of the factory is reduced from 65% to 60%, namely, the low-temperature reduction degradation tends to be deteriorated, the air permeability of the blast furnace is deteriorated, the pressure difference is increased, the smooth degradation is realized, and the planned daily output is difficult to complete. Example 1 provides a blast furnace burden distribution method, the capacity of the blast furnace is 3000m³The method comprises the following steps:

1. the index of low-temperature reduction degradation of the charged sintered ore was measured to be 65%, and the actual edge gas distribution index Δ η co of the blast furnace top at this time was monitored to be 8%.

2. Calculating a target edge coal gas distribution index according to the reduction degradation index of the sintering ore entering the furnace in the step 1 and a relational expression RDI ═ -0.6238 delta eta co +70, wherein the target edge coal gas distribution index specifically comprises the following steps:

the target edge gas distribution index Δ η co (70-65)/0.6238 is 16%.

3. Comparing the actual edge gas distribution index of the step 1 with the target edge gas distribution index of the step 2 to obtain a result: the actual edge gas distribution index is less than the target edge gas distribution index.

4. And (4) adjusting the cloth according to the comparison result in the step (3):

because the actual edge gas distribution index is 8 percent and is less than the target edge gas distribution index of 16 percent, the edge distribution needs to be dredged to develop the edge gas and improve the top gas distribution index from 8 percent to 16 percent. The specific adjusting method of the edge-dredging cloth comprises the following steps: the number of the coke rings at the edge is increased by 2 rings, and meanwhile, the edge gas passage is dredged in a mode that the maximum ore distribution angle is reduced by 1.5 degrees, in the process, the gas flow at the edge (furnace wall) part is gradually increased, the gas temperature is increased, the gas utilization rate at the edge part is reduced due to the increase of the edge gas amount, and finally the difference value with the middle girdle band reaches about 16 percent, namely delta eta co is increased from 8 percent to 16 percent.

Through the adjustment, although the overall gas utilization rate is reduced and the fuel consumption is slightly increased, the air permeability of the blast furnace is improved, the pressure difference is reduced, and a better state of completing daily output is gradually achieved.

Example 2

A cross temperature measurement system is used by a blast furnace of a certain factory to collect the distribution condition of furnace top gas. Because of the optimization of the sintering process, the low-temperature reduction degradation index measured by the national standard method of the furnace entering ore of the factory has a trend rising and is increased from 57% to 62%, namely, the low-temperature reduction degradation tends to be reduced, the air permeability of the blast furnace is improved, the pressure difference is reduced, the operation is smooth, and the blast furnace has a certain coal gas utilization rate increasing space on the basis of finishing the planned daily output. Example 2 provides a blast furnace burden distribution method, blast furnace volumeThe amount is 2500m³The method comprises the following steps:

1. the low-temperature reduction degradation index of the charged sinter is measured to be 62%, and the actual edge coal gas distribution index delta Ttop of the blast furnace top smelted at the moment is monitored to be 163 ℃.

2. Calculating a target edge coal gas distribution index according to the reduction degradation index of the sintering ore entering the furnace in the step 1 and a relational expression RDI (remote data index) — 0.1085 delta Ttop +74.5, and specifically:

the target edge gas distribution index Δ Ttop (74.5-62)/0.1085 ═ 115 ℃.

3. Comparing the actual edge gas distribution index of the step 1 with the target edge gas distribution index of the step 2 to obtain a result: the actual edge gas distribution index is greater than the target edge gas distribution index.

4. And (4) adjusting the cloth according to the comparison result in the step (3):

since the actual edge gas distribution index is 163 ℃ higher than the target edge gas distribution index of 115 ℃, the edge distribution needs to be adjusted to weight the edge gas and reduce the top gas distribution index from 163 ℃ to 115 ℃. The specific adjusting method of the weighted edge cloth comprises the following steps: the edge coke distribution angle is reduced from 38 degrees to 36.5 degrees, and the ore batch is increased from 58 t/batch to 61 t/batch.

Through the adjustment, although the overall permeability index is reduced and the pressure difference is slightly increased, the utilization rate of the blast furnace gas is improved, the fuel consumption is reduced, and a better state that the daily output is completed and the fuel consumption is further reduced is achieved.

Example 3

A cross gas analysis system is used by a blast furnace of a certain factory to collect the distribution condition of the top gas. Due to the deterioration of flux resources, the low-temperature reduction degradation index measured by the national standard method of furnace entering and mining of the factory has a tendency to be reduced from 63% to 58%, namely, the low-temperature reduction degradation tends to be deteriorated, the air permeability of a blast furnace is deteriorated, the pressure difference is increased, the smooth degradation is realized, and the planned daily output is difficult to complete. Example 3 provides a method for distributing material in a blast furnace with a capacity of 3200m³The method comprises the following steps:

1. the index of low-temperature reduction degradation of the charged sintered ore was measured to be 63%, and the actual edge gas distribution index Δ η co of the blast furnace top at this time was monitored to be 11.5%.

2. Calculating a target edge coal gas distribution index according to the reduction degradation index of the sintering ore entering the furnace in the step 1 and a relational expression RDI ═ -0.6238 delta eta co +72, wherein the target edge coal gas distribution index specifically comprises the following steps:

the target edge gas distribution index Δ η co (70-58)/0.6238 is 19.2%.

3. Comparing the actual edge gas distribution index of the step 1 with the target edge gas distribution index of the step 2 to obtain a result: the actual edge gas distribution index is less than the target edge gas distribution index.

4. And (4) adjusting the cloth according to the comparison result in the step (3):

because the actual edge gas distribution index is 11.5% and is less than the target edge gas distribution index of 19.2%, the edge gas needs to be dredged to improve the air permeability of the blast furnace and ensure the smooth operation of the blast furnace. The specific method of the distribution adjustment is that the ore distribution number is reduced from 57 t/batch to 55 t/batch, and the number of the ore distribution circles of each station is adjusted from 2342 to 2331.

Through the adjustment, although the overall gas utilization rate is reduced and the fuel consumption is slightly increased, the air permeability of the blast furnace is improved, the pressure difference is reduced, the smooth and stable furnace condition is gradually achieved, and the better state of daily output can be achieved.

Example 4

A cross gas analysis system is used by a blast furnace of a certain factory to collect the distribution condition of the top gas. Due to the change of ore blending conditions, the low-temperature reduction degradation index measured by the national standard method of ore entering the furnace of the factory has a tendency to be reduced from 64 percent to 62 percent, namely, the low-temperature reduction degradation tends to be deteriorated, the air permeability of the blast furnace is deteriorated, the pressure difference is increased, the smooth operation is deteriorated, and the planned daily output is difficult to complete. Embodiment 4 provides a blast furnace burden distribution method, which specifically comprises the following steps:

1. the low-temperature reduction degradation index of the charged sintered ore was measured to be 64%, and the actual edge gas distribution index Δ η co of the blast furnace top at this time was monitored to be 9.6%.

2. Calculating a target edge coal gas distribution index according to the reduction degradation index of the sintering ore entering the furnace in the step 1 and a relational expression RDI ═ -0.6088 delta eta co +71, wherein the target edge coal gas distribution index specifically comprises the following steps:

the target edge gas distribution index Δ η co (71-64)/0.6088 is 11.49%.

3. Comparing the actual edge gas distribution index of the step 1 with the target edge gas distribution index of the step 2 to obtain a result: the actual edge gas distribution index is less than the target edge gas distribution index.

4. And (4) adjusting the cloth according to the comparison result in the step (3):

because the actual edge gas distribution index is 9.6% and is less than the target edge gas distribution index of 11.49%, the edge distribution needs to be dredged to develop edge gas and increase the top gas distribution index from 9.6% to 11.49%. The specific adjusting method of the edge-dredging cloth comprises the following steps: the number of turns of the edge mine is reduced by 1 turn, and meanwhile, the edge coal gas channel is dredged in a mode that the maximum ore distribution angle is reduced by 1 degree, the coal gas flow at the edge (furnace wall) part is gradually increased in the process, the coal gas temperature is increased, the coal gas utilization rate at the edge part is reduced due to the increase of the edge coal gas volume, and finally the difference value between the coal gas utilization rate at the edge part and the middle ring belt reaches about 11.7 percent, namely delta eta co is increased from 9.6 percent to 11.7 percent. .

Through the adjustment, although the overall gas utilization rate is reduced and the fuel consumption is slightly increased, the air permeability of the blast furnace is improved, the pressure difference is reduced, and a better state of completing daily output is gradually achieved.

The invention provides a blast furnace distributing method, which is based on-site research to find that the low-temperature reduction degradation performance of furnace entering ores, particularly sinter ores and pellet ores, has obvious linear correlation with the edge development index of furnace top gas, calculates and obtains a target edge gas distribution index according to the relationship, then compares the actual edge gas distribution index with the target edge gas distribution index, and performs distributing adjustment according to the comparison result so as to obtain a good forward state under the condition of poor upper air permeability, thereby achieving the lowest fuel consumption under the condition of forward running of the furnace. The invention provides a quantitative distribution adjusting method by quantifying a linear relation between the low-temperature reduction degradation index of the iron ore and the edge coal gas development index. The distribution of the furnace top gas determined by factors such as the distribution of the blast furnace and the like can simultaneously influence the air permeability and the gas utilization rate of the blast furnace, and under the general condition, the air permeability of the blast furnace is better and the gas utilization rate is lower when edge gas is developed, so that smooth operation is facilitated, and the fuel consumption is not reduced; when the edge gas is restrained, the blast furnace has poor air permeability and high gas utilization rate, which is beneficial to reducing fuel consumption and ensuring smooth operation without using the blast furnace. The method quantifies and gives the corresponding relation between the RDI and the ideal edge coal gas development index by utilizing a linear regression formula, proposes that the RDI is taken as the basis, and when the RDI is higher (namely, the pulverization is slight), the utilization rate of the total coal gas of the blast furnace is improved by reducing the coal gas index at the edge of the furnace top; when the RDI of the furnace burden is low in low-temperature reduction degradation index (namely, degradation is serious), the gas permeability of the blast furnace is improved by adopting a mode of improving the gas index at the edge of the furnace top, the furnace condition smoothness is improved, and the method is calculated by technical personnel in the field of specific quantitative relation according to a given formula.

Finally, it should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.