CN113569381A - Calculation method for indirect reduction rate of large-scale blast furnace burden and determination of coal injection quantity - Google Patents
Calculation method for indirect reduction rate of large-scale blast furnace burden and determination of coal injection quantity Download PDFInfo
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- 230000009467 reduction Effects 0.000 title claims abstract description 86
- 239000003245 coal Substances 0.000 title claims abstract description 78
- 238000002347 injection Methods 0.000 title claims description 54
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- 238000004364 calculation method Methods 0.000 title claims description 18
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 42
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- 238000004519 manufacturing process Methods 0.000 claims description 30
- 239000000571 coke Substances 0.000 claims description 22
- 239000000843 powder Substances 0.000 claims description 14
- 238000007664 blowing Methods 0.000 claims description 11
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- 229910052799 carbon Inorganic materials 0.000 claims description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 5
- 229910052760 oxygen Inorganic materials 0.000 claims description 5
- 239000001301 oxygen Substances 0.000 claims description 5
- 239000002994 raw material Substances 0.000 claims description 5
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- 238000003723 Smelting Methods 0.000 abstract description 37
- 230000008569 process Effects 0.000 abstract description 24
- 238000006722 reduction reaction Methods 0.000 description 85
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- 229910052742 iron Inorganic materials 0.000 description 19
- 238000005516 engineering process Methods 0.000 description 15
- 238000004458 analytical method Methods 0.000 description 14
- 229910000831 Steel Inorganic materials 0.000 description 13
- 239000010959 steel Substances 0.000 description 13
- 239000000446 fuel Substances 0.000 description 9
- 239000007789 gas Substances 0.000 description 9
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- 229910000805 Pig iron Inorganic materials 0.000 description 3
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- GFNGCDBZVSLSFT-UHFFFAOYSA-N titanium vanadium Chemical compound [Ti].[V] GFNGCDBZVSLSFT-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention relates to a method for calculating indirect reduction rate of furnace charge of a large-scale blast furnace, which obtains the indirect reduction rate of the furnace charge in the large-scale blast furnace by analyzing different effective furnace volumes under the condition of different operating parameters, and can realize the control level of injected coal amount in the operating process of the blast furnace by analyzing the different effective furnace volumes, thereby realizing the low-consumption and high-efficiency smelting of the blast furnace.
Description
Technical Field
The invention relates to the technical field of iron making in the iron and steel industry, in particular to a large-scale blast furnace burden indirect reduction rate and a calculation method for determining the amount of injected coal.
Background
In the modern ferrous metal smelting process, a blast furnace is taken as main equipment in the iron-making production process, has the advantages of high heat efficiency, strong raw material adaptability, low processing and manufacturing cost, easiness in maintenance, simplicity and convenience in operation and the like, and although the social development of more than one hundred years is experienced, the blast furnace still occupies the most important position in the present pig iron processing and manufacturing field, namely that more than 90 percent of molten iron used in the current steel-making process is still supplied by blast furnace production, so that the importance of blast furnace production to the iron-making process is self-evident from the aspect. For the iron-making process, the core of the blast furnace daily production can be summarized by using the characters of stability, low consumption, high efficiency and long service life, namely, the optimization of the pig iron processing and manufacturing process can be realized only by the above characters, and the advantage of the blast furnace production can be reflected most. From the smelting characteristics of blast furnace burden materials, the main smelting process carried out in the furnace is that reducing substances in the furnace, such as coke, CO and the like, participate in the reduction reaction of the burden materials and capture elements such as oxygen and the like, so that the smelting production of pig iron is realized. However, in this smelting form, there is also a problem that the charging material is directly reduced by the carbon in the charged coke, i.e. the direct reduction reaction is considered; furthermore, after the hot air is blown in, the CO and the H are generated after the reaction with the coal powder and the coke2The indirect reduction reaction of gas, i.e. furnace charge reduced by gases such as CO, is the problem that two kinds of reactions account for the reduction share of furnace charge. In the view of practical production, because the coal gas has better fluidity, the reaction process is carried out in preference to coke, so that the improvement of the smelting effect in the furnace is expected, the more indirect reduction reaction proportion in the furnace is expected, the advantages that firstly, the coal powder injection amount can be increased after the technology of greatly injecting the coal powder is adopted, the effect of reducing the fuel consumption cost is further achieved, secondly, the gas reaction can improve the reduction reaction rate in the furnace, and the improvement of the blast furnace is further achievedThe operation process improves the daily smelting efficiency of the blast furnace. As the indirect reduction proportion is properly increased, the smelting process in the furnace can be facilitated, and the reduction effect is improved. Therefore, the conditions of the indirect reduction ratio and the direct reduction ratio in the blast furnace under different effective furnace volumes and different raw fuels and operating conditions need to be known, and the conditions are taken as technical analysis basis to analyze the improved parts in the blast furnace operating process of different effective furnace volumes, such as the control level of injected coal amount, the consumption amount of coke entering the blast furnace and the like, so as to realize the high-efficiency smelting of the blast furnace.
In daily production, the quality of the smelting process of furnace burden in the furnace is crucial to the indexes obtained by the blast furnace, which is also a consensus of a plurality of metallurgical workers. Therefore, both iron and steel enterprises and research institutions in external schools pay attention to the method, measures are taken in many ways, and the daily production of the blast furnace is optimized from different angles, for example, the smelting process of the blast furnace is improved through different measures of improving the quality of raw fuel, the equipment level of the furnace body, improving external auxiliary operation conditions and the like, the smelting efficiency of the blast furnace is improved, and therefore low-consumption and high-efficiency production is achieved. It should be noted here that, with the progress of equipment means, automatic control level, monitoring technology, etc., the smelting characteristics of today's blast furnace are greatly different from the past, one of the significant differences is that the amount of coal injection is greatly increased, the amount of fuel consumption is greatly reduced, which is also the advantage of blast furnace economy, and meanwhile, with the increase of the amount of coal powder injection and the reduction of the amount of coke entering the furnace, the smelting process in the furnace is greatly changed from the past, for example, the conditions of direct reduction ratio and indirect reduction ratio of furnace burden are greatly changed from the past. In reality, in the process of smelting in a blast furnace, a blast furnace serving as a large black box operation body container has three phases of gas, solid and liquid, and physical and chemical reaction processes are extremely complex, so that how to determine the ratio of indirect reduction and direct reduction in the blast furnace under different operation conditions under the complex conditions is one of the difficulties which are annoying metallurgical workers. In view of the importance of understanding the progress of the reduction reaction in the furnace, it is necessary to analyze this as a basis for guiding the operation of the blast furnace, such as the determination of the amount of injected coal and the fuel consumption. Most enterprises can judge the problems without the following methods and measures, namely, a traditional experience method is used for artificially judging the proportion of indirect reduction and direct reduction according to the quantity of fuel consumption and the structural type and by combining with the actual running state of a blast furnace; and the reaction process of different furnace charges in the furnace is analyzed by adopting laboratory and pilot plant to perform experimental analysis and relying on visual results in the laboratory, collected data and the like, so as to analyze the indirect reduction ratio and the direct reduction ratio. And the numerical simulation technology is adopted, partial parameters are input, and computer simulation is combined to solve the problems, which is also one of the more novel and leading-edge technical directions at present. However, it should be noted that no matter what kind of determination method is adopted as the basis for the reaction in the furnace, in reality, the method still has the defects of the imperfect parts, such as poor accuracy, timeliness and practicality, and therefore, a reliable and practical method needs to be found out under the complex reaction process in the furnace, the proportion of indirect reduction and direct reduction is analyzed, the operation state of the furnace charge in the furnace is really mastered, and the part of the blast furnace condition needing to be improved is found out, so that the high-efficiency smelting of the blast furnace is realized. For the existing smelting iron-making process, the realization of the better reduction effect of furnace charge is the first requirement of blast furnace smelting workers, and for this reason, the proper indirect reduction proportion and direct reduction proportion in the furnace need to be obtained, so that the efficient smelting under the condition of low fuel consumption can be realized. Therefore, there is a need to find an implementable method for analyzing the share of indirect and direct reduction of furnace charge, and in order to face this problem, many domestic and foreign metallurgical enterprises and research institutions of related colleges and universities are also working in this respect, and techniques for improving the operation state of the blast furnace from different angles are attempted, such as techniques for improving the indirect reduction effect in the furnace by taking external measures (see "method for strengthening indirect reduction of blast furnace and method for manufacturing gas dedicated therefor" patent application No. CN101818218A, "method for strengthening indirect reduction of blast furnace and method for manufacturing gas dedicated therefor" patent application No. CN101812555A, "method for treating metal ore and blast furnace for metal production" patent application No. CN105793442B, "energy utilization after high reactivity coke is added to a blast furnace" patent application No. CN102952910B, etc.), which is created by means of measures of different external furnaces or increasing reduction gas in the furnace, the increase of the indirect reduction proportion of the furnace charge is realized, so that the reduction degree of an indirect reduction section of the blast furnace is improved, meanwhile, the reduction rate of the furnace charge is also improved, and the aims of improving the productivity of the blast furnace and reducing the fuel consumption can be finally realized. By implementing the technical means and measures, the increase of the reduction ratio in the furnace can be realized in theory or practical application, so that the method is beneficial to the production of the blast furnace, but the invention is only provided with a method for increasing the reduction ratio, but the determination of the reduction ratio in the furnace is not mentioned, and even if the method is discussed, the method is only provided qualitatively and cannot be provided quantitatively. Also, there are some novel techniques such as a computational method (see Chinese patent 'method for calculating direct reduction degree of blast furnace under highly reactive coke and gas utilization rate' patent application No. CN102876823A, 'method and system for analyzing influence factors of blast furnace CO utilization rate' patent application No. CN108009343A, 'system for analyzing smelting level of blast furnace' patent application No. CN104313213B, 'method for predicting blast furnace gas utilization rate' patent application No. CN102703627B, etc.), and the calculation method is directed at different problems encountered in smelting process, through various detections and monitored data, a computational solution is adopted, and the calculation is of great significance for searching problems existing in the smelting process and is the technology with the highest implementation possibility, however, it is also necessary here to be understood that until the invention was created, no computational method relating to the indirect reduction of the charge in a blast furnace could be found. Furthermore, the invention is implemented by other metallurgical technologies for improving the operation state in the furnace (see Chinese patent 'a large-scale blast furnace grading ore coke mixed charging method' patent application No. CN105803142B, 'a method for optimizing the design and operation of the reduction process' patent application No. CN1318610C, 'a blast furnace blowing process' patent application No. CN102643937A, 'a blast furnace global group smelting process' patent application No. CN106119449B, 'a blast furnace smelting charge and blast furnace smelting method' patent application No. CN107586903A, 'a blast furnace burden distribution adjusting method for reasonably using multi-grade sintered ore' patent application No. CN 110244 331331331and the like), the invention is implemented by adopting the optimized process design, improving the quality and composition structure of the raw fuel, and simultaneously assisting the measures of improving the upper and lower regulating means, optimizing the burden distribution on the furnace top and the like to realize the improvement of the smelting effect in the production process of the blast furnace, the method has the advantages that the method achieves the effects of reducing energy consumption and achieving better furnace condition operation, is widely applied to different blast furnaces of different enterprises at present, but the method has better effect, but has no relation with the judgment of the indirect reduction rate in the blast furnace on the content and the technical method, and only has reference significance for optimizing the blast furnace operation. In addition, the method is a literature document which can be consulted at home and abroad (see the journal "Wu Steel technology" the influence of a charging mode on the reduction efficiency of a blast furnace indirect reduction zone "2017, 55, 3, 19-22; the" iron and steel vanadium titanium "research on the indirect reduction rule of an iron oxide carbon thermal reduction process" 2019, 40, 5 and 105-, however, it is undeniable that the documents mentioned the contents related to indirect reduction and direct reduction, but no specific analysis method for determining the indirect and direct reduction ratio in the furnace and no corresponding solution can be provided, so that the judgment of the correction amounts of the indirect reduction rate of the furnace charge and the blast furnace injection coal ratio still remains a pending problem for the smelting workers in view of the above-mentioned technical data.
Disclosure of Invention
The invention aims to solve the technical problem of providing a calculation method for determining the indirect reduction rate of the furnace burden of a large-scale blast furnace and the coal injection quantity of the furnace burden, so as to realize low-consumption and high-efficiency smelting of the blast furnace.
In order to achieve the purpose, the invention adopts the following technical scheme:
the method for calculating the indirect reduction rate of the furnace burden of the large-scale blast furnace comprises the following steps of calculating the indirect reduction rate of the furnace burden according to a formula (1):
the symbols in the formula:
IRR is furnace burden indirect reduction rate,%;
TFe is the mass percentage of iron element in the raw materials entering the furnace;
PCI is the blast furnace injection coal ratio, kg/t;
CCfixing the carbon content percent for blowing the mixed coal powder;
CVthe content of volatile components in the blowing mixed coal powder is percent;
RH2Oblowing hot air with water content percent;
RO2oxygen enrichment rate of blown hot air is percent;
RCOKEthe ratio of the coke charged into the blast furnace is kg/t;
KCfixing the carbon content in percent for the coke entering the furnace;
KVthe content of volatile components in the coke entering the furnace is percent;
m1is a coefficient, the value is 0.31; m is2Is a coefficient, the value is 0.42; m is3Is a coefficient, the value is 4.75; m is4Is a coefficient, the value is 0.37; m is5Is a coefficient, the value is 0.15;
α1the value is 0.92, t/kg for dimensional correction coefficient; alpha is alpha2The value is 1.25, t/kg for dimensional correction coefficient;
the effective furnace capacity range of the large-scale blast furnace is 2000m3～6000m3；
The mass percentage content range of the iron element in the raw materials entering the furnace is 45-65 percent;
the blast furnace coal injection ratio ranges from 80kg/t to 250 kg/t;
the fixed carbon content range in the blowing mixed coal powder is 50-80 percent;
the content range of volatile components in the injected mixed coal powder is 6 to 40 percent;
the range of the water content of the blown hot air is 0.1 to 2.0 percent;
the oxygen enrichment rate range of blown hot air is 0 to 10.0 percent;
the range of the coke ratio of the blast furnace is 200 kg/t-500 kg/t;
the fixed carbon content of the coke fed into the furnace is 75-95 percent,
the volatile content of the coke entering the furnace is 0.8-6%.
The calculation method for determining the coal injection quantity by the indirect reduction rate of the large-scale blast furnace burden comprises the steps of determining the correction quantity of the coal injection ratio of the blast furnace according to a formula (2), and revising the quantity of coal powder injected in the production process of the blast furnace;
PCIcorrection＝β1×(n1×IRR)1.35 (2)
The symbols in the formula:
PCIcorrectionThe correction quantity of the ratio of the coal injected into the blast furnace is kg/t;
β1the value is 505.28 kg/t for dimension correction coefficient;
n1the value is 0.81.
Compared with the prior art, the invention has the beneficial effects that:
by analyzing the large blast furnace with different effective furnace volumes, the indirect reduction rate of the furnace burden in the blast furnace is obtained under the conditions of different operating parameters, the control level of injected coal amount in the operation process of the blast furnace with different effective furnace volumes can be analyzed, and the low-consumption and high-efficiency smelting of the blast furnace is realized.
Detailed Description
The invention is further illustrated by the following examples:
the following examples describe the invention in detail. These examples are merely illustrative of the best embodiments of the present invention and do not limit the scope of the invention.
Example 1 (effective furnace volume 2580m in certain iron and steel works)3Blast furnace application as an example illustration)
Effective furnace volume 2580m3The relevant operating parameters of the blast furnace are detailed in table 1.
TABLE 1 effective furnace volume 2580m3Blast furnace operation related parameters
Effective furnace volume 2580m3Result of indirect reduction rate calculation of furnace charge in blast furnace
According to effective furnace volume 2580m3The operation parameters related to the indirect reduction of the furnace burden in the blast furnace smelting process are analyzed through a mathematical relation formula (1), and the analysis results are shown in a table 2.
TABLE 2 effective furnace volume 2580m3Indirect reduction rate of furnace charge in blast furnace
| Item | Numerical value |
| Furnace charge indirect reduction rate IRR% | 48.28 |
Correction of blast furnace injection coal ratio
After the technical scheme is applied to calculation, on the basis of the analyzed indirect reduction rate of the furnace burden in the furnace, the mathematical relation (2) is adopted to realize the analysis of the suitable coal injection amount of the blast furnace so as to determine the coal injection amount, and the correction amount of the coal injection ratio of the blast furnace is shown in a table 3.
TABLE 3 effective furnace volume 2580m3Correction of blast furnace injection coal ratio
| Item | Numerical value |
| Correction of blast furnace injection coal ratio, kg/t | 142.26 |
Blast furnace obtaining effect
The application effect of a 2580m3 blast furnace of a certain steel plant adopting the technology is shown in the table 4.
TABLE 4 blast furnace application Effect
The correction quantity of the blast furnace injection coal ratio is determined on the basis of analyzing the indirect reduction rate of the furnace burden in the furnace, and the technology is 2580m3After the blast furnace is implemented, the good operation effects of increasing the coal injection ratio by 22.26kg/t, increasing the daily output by 150 tons, saving the production cost of iron making by tons by 30 yuan are achieved, and the purposes of low consumption and high efficiency production of the blast furnace are achieved.
Example 2 (effective furnace volume 3200m in certain iron and steel works)3Blast furnace application as an example illustration)
Effective furnace volume 3200m3The relevant operating parameters of the blast furnace are detailed in table 5.
TABLE 5 effective furnace volume 3200m3Blast furnaceOperation related parameter
Effective furnace volume 2580m3Result of indirect reduction rate calculation of furnace charge in blast furnace
According to effective furnace volume 3200m3The operation parameters related to the indirect reduction of the furnace burden in the blast furnace smelting process are analyzed through a mathematical relation formula (1), and the analysis results are shown in a table 6.
TABLE 6 effective furnace volume 2580m3Indirect reduction rate of furnace charge in blast furnace
| Item | Numerical value |
| Furnace charge indirect reduction rate IRR% | 55.64 |
Correction of blast furnace injection coal ratio
After the technical scheme is applied to calculation, on the basis of the analyzed indirect reduction rate of the furnace burden in the furnace, the mathematical relation (2) is adopted to realize the analysis of the suitable coal injection amount of the blast furnace so as to determine the coal injection amount, and the correction amount of the coal injection ratio of the blast furnace is shown in a table 7.
TABLE 7 effective furnace volume 3200m3Correction of blast furnace injection coal ratio
Blast furnace obtaining effect
3200m for certain iron and steel works3The application effect of the blast furnace adopting the technology is shown in the table 8.
TABLE 8 blast furnace application Effect
| Item | Ratio of coal injected, kg/t | Daily output, ton | Ton iron cost, yuan/ton |
| Before implementation | 160 | 7700 | 2100 |
| After being implemented | 172.29 | 7900 | 2080 |
| Effect | +12.29 | +200 | -20 |
The correction quantity of the blast furnace injection coal ratio is determined on the basis of analyzing the indirect reduction rate of the furnace burden in the furnace,this technique is at 3200m3After the blast furnace is implemented, the good operation effect that the coal injection ratio is increased by 12.29g/t, the daily output is increased by 200 tons, the iron-making production cost per ton is saved by 20 yuan is achieved, and the purposes of low consumption and high efficiency production of the blast furnace are achieved.
Example 3 (effective furnace volume 4038m of certain iron and steel works)3Blast furnace application as an example illustration)
Effective furnace volume 4038m3The relevant operating parameters of the blast furnace are detailed in table 9.
TABLE 9 effective volume 4038m3Blast furnace operation related parameters
Effective furnace volume 4038m3Result of indirect reduction rate calculation of furnace charge in blast furnace
According to effective furnace volume 4038m3The operation parameters related to the indirect reduction of the furnace burden in the blast furnace smelting process are analyzed through a mathematical relation formula (1), and the analysis results are shown in a table 10.
TABLE 10 effective volume 4038m3Indirect reduction rate of furnace charge in blast furnace
Correction of blast furnace injection coal ratio
After the technical scheme is applied to calculation, on the basis of the analyzed indirect reduction rate of the furnace burden in the furnace, the analysis of the suitable coal injection amount of the blast furnace is realized by adopting the mathematical relation (2) so as to determine the coal injection amount, and the correction amount of the coal injection ratio of the blast furnace is shown in a table 11.
TABLE 11 effective furnace volume 3200m3Correction of blast furnace injection coal ratio
| Item | Numerical value |
| Correction of blast furnace injection coal ratio, kg/t | 183.46 |
Blast furnace obtaining effect
4038m from certain iron and steel works3The application effect of the blast furnace adopting the technology is shown in the table 12.
TABLE 12 blast furnace application effects
| Item | Ratio of coal injected, kg/t | Daily output, ton | Ton iron cost, yuan/ton |
| Before implementation | 200 | 9400 | 2050 |
| After being implemented | 183.46 | 9500 | 2040 |
| Effect | -16.54 | +100 | -10 |
The correction quantity of the blast furnace injection coal ratio is determined on the basis of analyzing the indirect reduction rate of the furnace burden in the blast furnace, and the technology is carried out in 4038m3After the blast furnace is implemented, on the basis of the original coal amount over-blowing, the good operation effect of reducing the coal injection ratio by 16.54kg/t, increasing the daily output by 100 tons, saving the production cost of iron-smelting per ton by 10 yuan is achieved, and the purposes of low consumption and high-efficiency production of the blast furnace are achieved.
Example 4 (effective furnace volume 4747m in certain iron and steel works)3Blast furnace application as an example illustration)
Effective furnace volume 4747m3The relevant operating parameters of the blast furnace are detailed in table 13.
TABLE 13 effective furnace volume 4747m3Blast furnace operation related parameters
Reduction ratio calculation result
According to effective furnace volume 4747m3The operation parameters related to the indirect reduction of the furnace burden in the blast furnace smelting process are analyzed through the mathematical relation (1), and the analysis results are shown in a table 14.
TABLE 14 effective furnace volume 4747m3Indirect reduction rate of furnace charge in blast furnace
| Item | Numerical value |
| Indirect Reduction Ratio (IRR) of furnace charge in furnace, percent | 55.59 |
Correction of blast furnace injection coal ratio
After the technical scheme is applied to calculation, on the basis of the analyzed indirect reduction rate of the furnace burden in the furnace, the analysis of the suitable coal injection amount of the blast furnace is realized by adopting the mathematical relation (2) so as to determine the coal injection amount, and the correction amount of the coal injection ratio of the blast furnace is shown in a table 15.
TABLE 15 effective furnace volume 4747m3Correction of blast furnace injection coal ratio
| Item | Numerical value |
| Correction of blast furnace injection coal ratio, kg/t | 172.10 |
Blast furnace obtaining effect
4747m for iron and steel works3The application effect of the blast furnace adopting the technology is shown in the table 16.
TABLE 16 blast furnace application Effect
| Item | Ratio of coal injected, kg/t | Daily output, ton | Ton iron cost, yuan/ton |
| Before implementation | 170 | 10300 | 2000 |
| After being implemented | 172.10 | 10550 | 1995 |
| Effect | +2.10 | +50 | -5 |
The correction quantity of the blast furnace injection coal ratio is determined on the basis of analyzing the indirect reduction rate of the furnace burden in the furnace, and the technology is implemented at 4747m3After the blast furnace is implemented, the injection coal ratio is improved by 2.10kg/t, the original injection coal ratio is basically suitable for increasing the daily output by 50 tons, the good operation effect of saving iron ironmaking production cost by 5 yuan per ton is achieved, and the purpose of low consumption and high efficiency production of the blast furnace is realized.
Example 4 (effective furnace volume 5500m in certain iron and steel works)3Blast furnace application as an example illustration)
Effective furnace volume 5500m3The relevant operating parameters of the blast furnace are detailed in table 17.
TABLE 17 effective furnace volume 5500m3Blast furnace operationRelated parameter
Reduction ratio calculation result
According to effective furnace volume 5500m3The operation parameters related to the indirect reduction of the furnace burden in the blast furnace smelting process realize the analysis of the indirect reduction condition in the blast furnace smelting process through the mathematical relation (1), and the analysis results are shown in a table 18.
TABLE 18 effective furnace volume 5500m3Indirect reduction rate of furnace charge in blast furnace
| Item | Numerical value |
| Indirect Reduction Ratio (IRR) of furnace charge in furnace, percent | 55.19 |
Correction of blast furnace injection coal ratio
After the technical scheme is applied to calculation, on the basis of the analyzed indirect reduction rate of the furnace burden in the furnace, the analysis of the suitable coal injection amount of the blast furnace is realized by adopting the mathematical relation (2) so as to determine the coal injection amount, and the correction amount of the coal injection ratio of the blast furnace is shown in a table 19.
TABLE 19 effective furnace volume 5500m3Correction of blast furnace injection coal ratio
| Item | Numerical value |
| Correction of blast furnace injection coal ratio, kg/t | 170.43 |
Blast furnace obtaining effect
5500m for certain iron and steel works3The application effect of the blast furnace adopting the technology is shown in the table 20.
TABLE 20 blast furnace application Effect
The correction quantity of the blast furnace injection coal ratio is determined on the basis of analyzing the indirect reduction rate of the furnace burden in the furnace, and the technology is 5500m3After the blast furnace is implemented, the good operation effect that 10.43 kg/t of injected coal is increased, the daily output is increased by 100 tons, the production cost of iron-making per ton is saved by 20 yuan is achieved, and the purposes of low consumption and high efficiency production of the blast furnace are achieved.
Claims (2)
1. The method for calculating the indirect reduction rate of the furnace burden of the large-scale blast furnace is characterized by calculating the indirect reduction rate of the furnace burden according to a formula (1):
the symbols in the formula:
IRR is furnace burden indirect reduction rate,%;
TFe is the mass percentage of iron element in the raw materials entering the furnace;
PCI is the blast furnace injection coal ratio, kg/t;
CCfixing the carbon content percent for blowing the mixed coal powder;
CVthe content of volatile components in the blowing mixed coal powder is percent;
RH2Oblowing hot air with water content percent;
RO2oxygen enrichment rate of blown hot air is percent;
RCOKEthe ratio of the coke charged into the blast furnace is kg/t;
KCfixing the carbon content in percent for the coke entering the furnace;
KVthe content of volatile components in the coke entering the furnace is percent;
m1is a coefficient, the value is 0.31; m is2Is a coefficient, the value is 0.42; m is3Is a coefficient, the value is 4.75; m is4Is a coefficient, the value is 0.37; m is5Is a coefficient, the value is 0.15;
α1the value is 0.92, t/kg for dimensional correction coefficient; alpha is alpha2The value is 1.25, t/kg for dimensional correction coefficient;
the effective furnace volume range of the large-scale blast furnace is 2000m3～6000m3；
The mass percentage content range of the iron element in the raw materials entering the furnace is 45-65%;
the blast furnace injection coal ratio range is 80 kg/t-250 kg/t;
the content range of the fixed carbon in the blowing mixed coal powder is 50-80 percent;
the content range of volatile components in the blowing mixed coal powder is 6-40 percent;
the range of the water content of the blown hot air is 0.1 to 2.0 percent;
the oxygen enrichment rate range of the blown hot air is 0 to 10.0 percent;
the range of the charging coke ratio of the blast furnace is 200 kg/t-500 kg/t;
the fixed carbon content of the coke charged into the furnace is 75-95 percent,
the volatile content range of the coke charged into the furnace is 0.8-6%.
2. The calculation method for determining the coal injection quantity by the indirect reduction rate of the large-scale blast furnace burden comprises the steps of determining the correction quantity of the coal injection ratio of the blast furnace according to a formula (2), and revising the quantity of coal powder injected in the production process of the blast furnace;
PCIcorrection＝β1×(n1×IRR)1.35 (2)
The symbols in the formula:
PCIcorrectionThe correction quantity of the ratio of the coal injected into the blast furnace is kg/t;
β1the value is 505.28 kg/t for dimension correction coefficient;
n1the value is 0.81.
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| JPH08260008A (en) * | 1995-03-22 | 1996-10-08 | Sumitomo Metal Ind Ltd | Operation of blast furnace |
| CN108913831A (en) * | 2018-09-05 | 2018-11-30 | 鞍钢股份有限公司 | Method for determining coal injection amount of blast furnace |
| CN109112240A (en) * | 2018-09-05 | 2019-01-01 | 鞍钢股份有限公司 | Method for determining reasonable oxygen enrichment rate of blast furnace |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH08260008A (en) * | 1995-03-22 | 1996-10-08 | Sumitomo Metal Ind Ltd | Operation of blast furnace |
| CN108913831A (en) * | 2018-09-05 | 2018-11-30 | 鞍钢股份有限公司 | Method for determining coal injection amount of blast furnace |
| CN109112240A (en) * | 2018-09-05 | 2019-01-01 | 鞍钢股份有限公司 | Method for determining reasonable oxygen enrichment rate of blast furnace |
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| CN114277205A (en) * | 2021-11-19 | 2022-04-05 | 中冶赛迪工程技术股份有限公司 | Method for determining optimal injection amount of blast furnace injection medium |
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