CN110724775A - Method for selecting total tuyere area in blast furnace production - Google Patents
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 133
- 238000000034 method Methods 0.000 title claims abstract description 85
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 66
- 229910052742 iron Inorganic materials 0.000 claims abstract description 33
- 239000002994 raw material Substances 0.000 claims abstract description 30
- 239000003245 coal Substances 0.000 claims abstract description 17
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 16
- 239000001301 oxygen Substances 0.000 claims abstract description 16
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 15
- 239000000571 coke Substances 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims description 11
- 239000000843 powder Substances 0.000 claims description 10
- 239000008188 pellet Substances 0.000 claims description 9
- 238000007664 blowing Methods 0.000 claims description 4
- 238000003723 Smelting Methods 0.000 abstract description 18
- 229910000831 Steel Inorganic materials 0.000 abstract description 7
- 239000010959 steel Substances 0.000 abstract description 7
- 230000000694 effects Effects 0.000 description 32
- 238000005457 optimization Methods 0.000 description 17
- 239000000203 mixture Substances 0.000 description 13
- 239000000446 fuel Substances 0.000 description 11
- 238000004364 calculation method Methods 0.000 description 6
- 229910000805 Pig iron Inorganic materials 0.000 description 5
- 230000000903 blocking effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000005272 metallurgy Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/16—Tuyéres
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- Manufacturing & Machinery (AREA)
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- Organic Chemistry (AREA)
- Manufacture Of Iron (AREA)
Abstract
The invention belongs to the technical field of iron making in the iron and steel industry, and particularly relates to a method for selecting the total tuyere area in blast furnace production. According to the requirement of optimally selecting the tuyere area, the following method is adopted to select the total tuyere area of the blast furnace in production by taking the operating parameters of the blast furnace blast hot air amount in production, the blast furnace hot air pressure in production, the pressure difference between the upper part and the lower part of the blast furnace in production, the oxygen enrichment rate of the blast furnace in production, the thermal state strength of coke used by the blast furnace in production, the fixed carbon content of mixed pulverized coal sprayed into the blast furnace in production and the total iron grade in the raw materials used by the blast furnace in production as the basic reference data:
Description
Technical Field
The invention belongs to the technical field of iron making in the iron and steel industry, and particularly relates to a method for selecting the total tuyere area in blast furnace production.
Background
From the analysis of the actual running states of different iron-making processes, blast furnace smelting has the advantages of low investment, high efficiency, low cost and the like, and becomes the mainstream process of iron-making production. However, as the national regulations on energy are more strict, the single extensive production mode is controlled in the past, which requires the existing blast furnace smelting economy to be greatly improved. The current blast furnace daily operation is continuously based on the classic operation policy of combining the lower regulation and the upper regulation and the lower regulation, namely the establishment of a lower reasonable regulation system, which is the basis for maintaining the whole blast furnace production. The lower regulating system is composed of air quantity, air temperature, rich oxygen, coal powder injection and tuyere area. The external means of regulating the air quantity, air temperature and coal powder injection are characterized in that the regulation means can be changed at any time according to different changes of the furnace conditions in the process of operating the blast furnace. With the increase of smelting requirements in the industry, the selection of a proper lower regulation system in the running process of the blast furnace is very important for the smelting economy of the blast furnace.
The requirements of the modern smelting process for the blast furnace are 'stable, smooth, low consumption and high efficiency', and the area of the tuyere, which is one of the lower regulation systems, is difficult to change in the operation process due to the limitation of the blast furnace by factors such as a continuous production container, an installation position and the like. Therefore, the proper tuyere area needs to be found out to maintain the normal production of the blast furnace on the premise of maintaining the stable and smooth running of the blast furnace. At present, the selection of the proper tuyere area is still one of the difficulties troubling ironmaking producers, and for the current metallurgical enterprises, the selection of the tuyere area mostly still continues to use design data, namely at the beginning of the design of the blast furnace, according to the classical design adopted by the blast furnace in the past, the diameter and the length of a single tuyere for the designed blast furnace are given, then the total tuyere area of the blast furnace is calculated, or artificial experience data is adopted, the tuyere area in the production process is selected according to the experience furnace condition, and the adopted tuyere area basically does not change unless the furnace condition changes greatly. However, it should be noted that, because the blast furnace is a complicated black box operation container, the internal reaction process is complicated, and the difference between the raw fuels used by different blast furnaces is large, the operating system adopted by different blast furnaces is also greatly different during the operation process, which means that there are many error zones along with the traditional design data or experience data. Therefore, an appropriate method is urgently needed to find out an appropriate tuyere area required in the production process so as to achieve smelting effects of stabilizing blast furnace operation and reducing consumption.
Because the tuyere area selection problem exists and is closely related to the establishment of a reasonable smelting system of a blast furnace, the problem arouses the attention of smelting workers who also seek different methods and devices to realize the selection suitable for the tuyere area of the blast furnace nowadays. In addition, the methods and the devices also achieve certain effects in practical application, but have many unreasonables. However, the prior arts mainly focus on the technology of reducing the diameter of the tuyere (see Chinese patent ' method for controlling the smelting intensity of a blast furnace by using a tuyere lining ': patent application No. CN102605123A, ' method for manufacturing a durable tuyere reducing small sleeve for controlling the smelting intensity of the blast furnace ': patent application No. CN102286651A, ' tuyere reducing sleeve for a blast furnace ' patent application No. CN2797375, ' adjusting device for the air inlet area of a blast furnace inlet ': CN104313223A, ' refractory core 249 patent application No. CN 2934etc. for blocking the tuyere small sleeve for the blast furnace)The area of the tuyere is reduced in the production process by increasing a tuyere lining or adopting measures such as stemming and refractory material for blocking the tuyere and the like, and a certain application effect is achieved. Although these measures have achieved a certain effect, the effect of selecting an appropriate tuyere area cannot be achieved as a temporary adjustment measure for the tuyere area. And a method for selecting the area of the tuyere in the production process of the blast furnace by adjusting the actual blast furnace air inlet volume in the production process or combining theoretical calculation (see Chinese patent 'a blast furnace tuyere air volume adjusting device' patent application No. CN201873699U17, 'an adjusting device for the air inlet area of the blast furnace' patent application No. CN101117649, 'a method for determining the proper tuyere diameter of the blast furnace' patent application No. CN108504811A and the like), wherein the method is theoretically feasible and is a better development direction, and is not strong in practicability, difficult to realize and general in effect due to the restriction of practical conditions. In addition, other means are adopted to achieve the same purpose of adjusting the area of the tuyere (see Chinese patent 'tuyere for reducing low-temperature dull areas between tuyeres of a blast furnace hearth and a using process thereof' patent application No. CN1036227, 'method for quantitatively evaluating activity of tuyere convolution areas' patent application No. CN102758039A and the like). the method adopts the steps of arranging and using the existing tuyere at intervals, reducing the low-temperature dull areas between the tuyeres of the blast furnace hearth, improving the edge temperature of the blast furnace hearth, moving down the position of a soft melting zone, improving the temperature of the lower part of the hearth and improving the economic and technical indexes of the blast furnace. However, it is questionable whether the method can improve the blast furnace effect in the actual production, and the creation of the method is not relevant to the present invention. In addition, the method is a document that can be looked up at home and abroad (see the journal "Chinese metallurgy" discussion about the adjustment method of tuyere area of blast furnace ", 2007, 17 vol., 12 th, 2;" Shandong metallurgy "Lai Steel 3200m3The practical production practice of adjusting the area of the tuyere of the blast furnace, namely' 2013, 35 rolls, 2 days, 7 and the like) is described in the documentsIn the process, the influence of the size of the tuyere on the speed, the flow and the blowing kinetic energy of the tuyere is simulated by establishing an air supply system model, so that the area of the tuyere suitable for production is found out, and a series of measures for improving the activity of a hearth are taken in the production practice of adjusting the area of the tuyere of a blast furnace, so that the furnace condition is smooth, the stability of the furnace condition is enhanced, the fuel ratio is reduced, and the production effect is obvious. However, the selection of blast furnace operation parameters and tuyere areas in the documents is not deeply mentioned, relevant mathematical relations are not established, and most of the documents still stay in empirical selection. Therefore, the prior art in the metallurgical field still cannot realize the selection of the proper tuyere area in the daily production process of the blast furnace.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a method for selecting the total tuyere area in blast furnace production. The method realizes the determination of the suitable tuyere area in the production process of the blast furnace, and after the tuyere area is determined by adopting the method, the daily organizational production of the blast furnace is carried out, so that the stable operation of the blast furnace can be realized, and the most economic smelting is finally realized.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for selecting the total tuyere area in blast furnace production adopts the following method to select the total tuyere area in the blast furnace production according to the requirement of optimally selecting the tuyere area and by taking the operating parameters of the blast furnace blast hot air quantity, the blast hot air pressure, the pressure difference between the upper part and the lower part of the blast furnace, the oxygen enrichment rate of the blast furnace, the thermal state strength of coke used by the blast furnace, the fixed carbon content of mixed pulverized coal sprayed by the blast furnace and the total iron grade in the raw materials used for producing the blast furnace as basic reference data in the daily production process of the blast furnace:
the symbols in the formula:
FKMJ is total tuyere area m of blast furnace in production2；
Blast furnace hot blast amount of RFL in production3/min；
RFYL is blast hot air pressure of blast furnace in production, kPa;
YC is the pressure difference between the upper part and the lower part of the blast furnace in production, kPa;
FYL is the oxygen enrichment rate of the blast furnace in production,%;
CSR is the thermal state strength of coke used in the production of the blast furnace,%;
FC is used for injecting mixed coal powder into the blast furnace for production, wherein the fixed carbon content is percent;
TFe is the grade of total iron in the raw materials used for producing the blast furnace;
k1is a coefficient, the value range is 1.50-1.64, and the dimension is m-1·min-3；
k2Is a coefficient, the value range is 1.50-1.64, and the dimension is m2；
k3Is a coefficient, the value range is 2.20-2.40, and the dimension is m-2；
k4The coefficient is 6.61-6.89, and the dimension is kPa2.7·m-2；
k5Is a coefficient, the value range is 4.40-4.58, and the dimension is m2。
The effective furnace volume of the blast furnace is 400m3～6000m3The blast furnace of (1).
The control range of blast hot air quantity of the blast furnace in the production is 800m3/min～9500m3/min。
The control range of the blast hot air pressure of the blast furnace in the production is 160 kPa-600 kPa.
The control range of the pressure difference between the upper part and the lower part of the blast furnace in the production is 80 kPa-260 kPa.
The control range of the oxygen enrichment rate of the blast furnace in the production is 0-12 percent.
The control range of the thermal state strength of the coke used by the blast furnace in the production is 45-75 percent.
The control range of the fixed carbon content of the blast furnace sprayed mixed pulverized coal in the production is 60-85%.
The blast furnace charging raw materials are two materials of sinter and pellet ore, or two materials of sinter and lump ore, or three materials of sinter, pellet ore and lump ore.
The control range of the total iron grade in the raw materials fed into the blast furnace used in the production is 45-62 percent.
Compared with the prior art, the invention has the beneficial effects that:
according to the method, the mathematical relationship between different operating parameters of the blast furnace and the optimal selection of the tuyere area is established, so that the determination of the proper tuyere area in the production process of the blast furnace is realized. After the area of the tuyere is determined by adopting the method, the blast furnace is subjected to daily organizational production, so that the stable blast furnace operation can be realized, and the most economical smelting is finally realized.
Detailed Description
The following further illustrates embodiments of the invention, but is not intended to limit the scope thereof:
a method for selecting the total tuyere area in blast furnace production adopts the following method to select the total tuyere area in the blast furnace production according to the requirement of optimally selecting the tuyere area and by taking the operating parameters of the blast furnace blast hot air quantity, the blast hot air pressure, the pressure difference between the upper part and the lower part of the blast furnace, the oxygen enrichment rate of the blast furnace, the thermal state strength of coke used by the blast furnace, the fixed carbon content of mixed pulverized coal sprayed by the blast furnace and the total iron grade in the raw materials used for producing the blast furnace as basic reference data in the daily production process of the blast furnace:
the symbols in the formula:
FKMJ is total tuyere area m of blast furnace in production2；
Blast furnace hot blast amount of RFL in production3/min；
RFYL is blast hot air pressure of blast furnace in production, kPa;
YC is the pressure difference between the upper part and the lower part of the blast furnace in production, kPa;
FYL is the oxygen enrichment rate of the blast furnace in production,%;
CSR is the thermal state strength of coke used in the production of the blast furnace,%;
FC is used for injecting mixed coal powder into the blast furnace for production, wherein the fixed carbon content is percent;
TFe is the grade of total iron in the raw materials used for producing the blast furnace;
k1is a coefficient, the value range is 1.50-1.64, and the dimension is m-1·min-3；
k2Is a coefficient, the value range is 1.50-1.64, and the dimension is m2；
k3Is a coefficient, the value range is 2.20-2.40, and the dimension is m-2；
k4The coefficient is 6.61-6.89, and the dimension is kPa2.7·m-2；
k5Is a coefficient, the value range is 4.40-4.58, and the dimension is m2。
The effective furnace volume of the blast furnace is 400m3～6000m3The blast furnace of (1).
The control range of blast hot air quantity of the blast furnace in the production is 800m3/min～9500m3/min。
The control range of the blast hot air pressure of the blast furnace in the production is 160 kPa-600 kPa.
The control range of the pressure difference between the upper part and the lower part of the blast furnace in the production is 80 kPa-260 kPa.
The control range of the oxygen enrichment rate of the blast furnace in the production is 0-12 percent.
The control range of the thermal state strength of the coke used by the blast furnace in the production is 45-75 percent.
The control range of the fixed carbon content of the blast furnace sprayed mixed pulverized coal in the production is 60-85%.
The blast furnace charging raw materials are two materials of sinter and pellet ore, or two materials of sinter and lump ore, or three materials of sinter, pellet ore and lump ore.
The control range of the total iron grade in the raw materials fed into the blast furnace used in the production is 45-62 percent.
The following 5 examples are given to illustrate the specific embodiments of the present invention, and the specific contents are as follows:
example 1
450m of effective furnace volume of a certain steel plant3The blast furnace process is illustrated as an example:
1.1 blast furnace charge stock structure composition
The structural composition of the raw materials fed into the blast furnace is detailed in table 1.
TABLE 1 structural composition of blast furnace charge materials
1.2 blast furnace operating index in production
The blast furnace operating index in the production is shown in Table 2.
TABLE 2 blast furnace operating index in production
| Item | Index (I) |
| Amount of hot air blown (m)3/min) | 1200 |
| Hot air pressure (kPa) of drum | 240 |
| Blast furnace pressure difference (kPa) | 100 |
| Oxygen enrichment (%) | 1.0 |
| Thermal strength of coke (%) | 50 |
| Fixed carbon content (%) -sprayed into mixed coal powder | 72 |
| Grade of total iron in raw materials entering furnace (%) | 50 |
1.3 optimizing and adjusting the total tuyere area in production
According to the calculation method of the total tuyere area in the optimization adjustment production provided by the invention, the change of the total tuyere area of the blast furnace after optimization adjustment is detailed in a table 3.
TABLE 3 comparison of the areas of the optimized and adjusted tuyeres of the blast furnace
| Item | Air outlet number (number) | Average diameter of air outlet (mm) | Area of tuyere (m)2) |
| Tuyere system for original blast furnace | 16 | 100 | 0.126 |
| Adjusting rear tuyere system | 16 | 105 | 0.139 |
| Amount of change | / | +5 | +0.13 |
1.4 blast furnace process application effects
After the area of the tuyere is optimized and adjusted, the application effect of the blast furnace process is detailed in table 4.
TABLE 4 blast furnace process application effect comparison
| Item | Fuel ratio (kg/t) | Yield (t/d) | Ton iron cost (Yuan/ton) |
| Original scheme | 585 | 1700 | 2114 |
| Optimization of a control plan | 580 | 1750 | 2088 |
| Effect | -5 | +50 | -26 |
In the process of daily production according to the method, the mathematical relationship between different operation parameters and optimal selection of the tuyere area is established, so that the proper tuyere area of the blast furnace is established, and after the tuyere area is established by adopting the method, the daily production is organized, so that the effects of reducing the fuel consumption by 5kg for ton of iron, increasing the daily output of pig iron by 50t and reducing the processing and manufacturing cost of ton of iron by 26 yuan/ton can be achieved, the stable operation can be achieved, and the most economic smelting of the blast furnace can be finally realized.
Example 2
1280m of effective furnace volume of a certain steel plant3The blast furnace process is illustrated as an example:
2.1 blast furnace charge stock construction
The structural composition of the raw materials fed into the blast furnace is detailed in table 5.
TABLE 5 structural composition of blast furnace charge materials
| Item | Raw materials |
| Variety of (IV) C | Sinter and lump ore |
2.2 blast furnace operating index in production
The blast furnace operating index in the production is shown in Table 6.
TABLE 6 blast furnace operating index in production
| Item | Index (I) |
| Amount of hot air blown (m)3/min) | 2600 |
| Hot air pressure (kPa) of drum | 320 |
| Blast furnace pressure difference (kPa) | 140 |
| Oxygen enrichment (%) | 3.0 |
| Thermal strength of coke (%) | 57 |
| Fixed carbon content (%) -sprayed into mixed coal powder | 74 |
| Grade of total iron in raw materials entering furnace (%) | 55 |
2.3 optimizing and adjusting the total tuyere area in production
According to the calculation method of the total tuyere area in the optimization adjustment production provided by the invention, the change of the total tuyere area of the blast furnace after optimization adjustment is shown in the table 7 in detail.
TABLE 7 comparison of the areas of the tuyeres of the blast furnace after optimization and adjustment
| Item | Air outlet number (number) | Average diameter of air outlet (mm) | Area of tuyere (m)2) |
| Tuyere system for original blast furnace | 22 | 108 | 0.201 |
| Adjusting rear tuyere system | 22 | 105 | 0.190 |
| Amount of change | / | -3 | -0.11 |
2.4 blast furnace Process effects
After the area of the tuyere is optimized and adjusted, the process application effect of the blast furnace is detailed in table 8.
TABLE 8 blast furnace Process comparison of application results
| Item | Fuel ratio (kg/t) | Yield (t/d) | Ton iron cost (Yuan/ton) |
| Original scheme | 558 | 3200 | 2034 |
| Optimization of a control plan | 551 | 3265 | 2010 |
| Effect | -7 | +65 | -24 |
In the process of daily production according to the method, the mathematical relationship between different operation parameters and optimal selection of the tuyere area is established, so that the proper tuyere area of the blast furnace is established, and after the tuyere area is established by adopting the method, the daily production is organized, so that the effects of reducing the fuel consumption by 7kg for ton of iron, increasing the daily output of pig iron by 65t and reducing the processing and manufacturing cost by 24 yuan/ton for ton of iron can be achieved, the stable operation can be achieved, and the most economic smelting of the blast furnace can be finally realized.
Example 3
With an effective furnace volume of 2580m in a certain steel plant3Blast furnace process as an example
3.1 blast furnace charge stock construction
The structural composition of the raw materials charged into the blast furnace is detailed in Table 9.
TABLE 9 structural composition of blast furnace raw materials
| Item | Raw materials |
| Variety of (IV) C | Agglomerate and pellet lump ore |
3.2 blast furnace operating index in production
The blast furnace operating index in production is shown in Table 10.
TABLE 10 blast furnace operating index in production
| Item | Index (I) |
| Amount of hot air blown (m)3/min) | 4600 |
| Hot air pressure (kPa) of drum | 360 |
| Blast furnace pressure difference (kPa) | 150 |
| Oxygen enrichment (%) | 3.5 |
| Thermal strength of coke (%) | 63 |
| Fixed carbon content (%) -sprayed into mixed coal powder | 70 |
| Grade of total iron in raw materials entering furnace (%) | 57 |
3.3 optimizing and adjusting the total tuyere area in production
According to the calculation method of the total tuyere area in the optimization adjustment production provided by the invention, the change of the total tuyere area of the blast furnace after optimization adjustment is shown in the table 11.
TABLE 11 comparison of blast furnace tuyere areas after optimization adjustment
| Item | Air outlet number (number) | Average diameter of air outlet (mm) | Area of tuyere (m)2) |
| Tuyere system for original blast furnace | 30 | 115 | 0.313 |
| Adjusting rear tuyere system | 30 | 120 | 0.338 |
| Amount of change | / | +5 | +0.25 |
3.4 blast furnace Process effects
After the area of the tuyere is optimized and adjusted, the process application effect of the blast furnace is detailed in table 12.
TABLE 12 comparison of blast furnace process application results
| Item | Fuel ratio (kg/t) | Yield (t/d) | Ton iron cost (Yuan/ton) |
| Original scheme | 534 | 5930 | 1987 |
| Optimization of a control plan | 528 | 5972 | 1965 |
| Effect | -6 | +42 | -22 |
In the process of daily production according to the method, the mathematical relationship between different operation parameters and optimal selection of the tuyere area is established, so that the proper tuyere area of the blast furnace is established, and after the tuyere area is established by adopting the method, the daily production is organized, so that the effects of reducing the fuel consumption by 6kg for ton of iron, increasing the daily output of pig iron by 42t and reducing the processing and manufacturing cost of ton of iron by 22 yuan/ton can be achieved, the stable operation can be achieved, and the most economic smelting of the blast furnace can be finally realized.
Example 4
With an effective furnace volume of 3200m in a certain steel plant3The blast furnace process is illustrated as an example:
4.1 blast furnace charge stock structure composition
The structural composition of the blast furnace raw materials is shown in Table 13.
TABLE 13 structural composition of blast furnace raw materials
| Item | Raw materials |
| Variety of (IV) C | Sintered ore and pellet ore |
4.2 blast furnace operating index in production
The blast furnace operating index in the production is shown in Table 14.
TABLE 14 blast furnace operating index in production
| Item | Index (I) |
| Amount of hot air blown (m)3/min) | 5300 |
| Hot air pressure (kPa) of drum | 400 |
| Blast furnace pressure difference (kPa) | 160 |
| Oxygen enrichment (%) | 2.5 |
| Thermal strength of coke (%) | 67 |
| Fixed carbon content (%) -sprayed into mixed coal powder | 68 |
| Grade of total iron in raw materials entering furnace (%) | 58.5 |
4.3 optimizing and adjusting the total tuyere area in production
According to the calculation method of the total tuyere area in the optimization adjustment production provided by the invention, the change of the total tuyere area of the blast furnace after optimization adjustment is shown in the table 15.
TABLE 15 blast furnace tuyere area comparison after optimization adjustment
| Item | Air outlet number (number) | Average diameter of air outlet (mm) | Area of tuyere (m)2) |
| Tuyere system for original blast furnace | 32 | 125 | 0.393 |
| Adjusting rear tuyere system | 32 | 120 | 0.362 |
| Amount of change | / | -5 | -0.31 |
4.4 blast furnace Process effects
After the area of the tuyere is optimized and adjusted, the process application effect of the blast furnace is detailed in table 16.
TABLE 16 blast furnace Process application Effect comparison
In the process of daily production according to the method, the mathematical relationship between different operation parameters and optimal selection of the tuyere area is established, so that the proper tuyere area of the blast furnace is established, and after the tuyere area is established by adopting the method, the daily production is organized, so that the effects of reducing the fuel consumption by 5kg for ton of iron, increasing the daily output of pig iron by 55t and reducing the processing and manufacturing cost of ton of iron by 18 yuan/ton can be achieved, the stable operation can be achieved, and the most economic smelting of the blast furnace can be finally realized.
Example 5
4038m in effective furnace volume of certain steel plant3The blast furnace process is illustrated as an example:
5.1 blast furnace charge stock structure composition
The composition of the raw materials charged into the blast furnace is shown in Table 17.
TABLE 17 structural composition of blast furnace raw materials
| Item | Raw materials |
| Variety of (IV) C | Sintered ore and pellet ore |
5.2 blast furnace operating index in production
The blast furnace operating index in the production is shown in Table 18.
TABLE 18 blast furnace operating index in production
| Item | Index (I) |
| Amount of hot air blown (m)3/min) | 6200 |
| Hot air pressure (kPa) of drum | 420 |
| Blast furnace pressure difference (kPa) | 160 |
| Oxygen enrichment (%) | 3.0 |
| Thermal strength of coke (%) | 69 |
| Fixed carbon content (%) -sprayed into mixed coal powder | 70 |
| Grade of total iron in raw materials entering furnace (%) | 59.5 |
5.3 optimizing and adjusting the total tuyere area in production
According to the calculation method of the total tuyere area in the optimization adjustment production provided by the invention, the change of the total tuyere area of the blast furnace after optimization adjustment is shown in the table 19.
TABLE 19 comparison of the areas of the optimized and adjusted tuyeres of the blast furnace
| Item | Air outlet number (number) | Average diameter of air outlet (mm) | Area of tuyere (m)2) |
| Tuyere system for original blast furnace | 36 | 130 | 0.478 |
| Adjusting rear tuyere system | 36 | 120 | 0.408 |
| Amount of change | / | -10 | -0.70 |
5.4 blast furnace Process effects
After the area of the tuyere is optimized and adjusted, the process application effect of the blast furnace is detailed in the table 20.
TABLE 20 blast furnace Process application Effect comparison
| Item | Fuel ratio (kg/t) | Yield (t/d) | Ton iron cost (Yuan/ton) |
| Original scheme | 502 | 9600 | 1887 |
| Optimization of a control plan | 498 | 9670 | 1870 |
| Effect | -4 | +70 | -17 |
In the process of daily production according to the method, the mathematical relationship between different operation parameters and optimal selection of the tuyere area is established, so that the proper tuyere area of the blast furnace is established, and after the tuyere area is established by adopting the method, the daily production is organized, so that the effects of reducing the fuel consumption by 4kg for ton of iron, increasing the daily output of pig iron by 70t and reducing the processing and manufacturing cost of the ton of iron by 17 yuan/ton can be achieved, the stable operation can be achieved, and the most economic smelting of the blast furnace can be finally realized.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. A method for selecting the total tuyere area in blast furnace production adopts operation parameters of blast furnace hot air blowing amount, blast furnace hot air blowing pressure, pressure difference between the upper part and the lower part of the blast furnace, oxygen enrichment rate of the blast furnace, coke thermal state strength of the blast furnace, fixed carbon content of mixed pulverized coal sprayed by the blast furnace, and total iron grade in raw materials used for producing the blast furnace as basic reference data according to the requirement of optimizing and selecting the tuyere area in the daily production process of the blast furnace, and is characterized in that the following method is adopted to select the total tuyere area of the blast furnace:
the symbols in the formula:
FKMJ is total tuyere area m of blast furnace in production2；
Blast furnace hot blast amount of RFL in production3/min；
RFYL is blast hot air pressure of blast furnace in production, kPa;
YC is the pressure difference between the upper part and the lower part of the blast furnace in production, kPa;
FYL is the oxygen enrichment rate of the blast furnace in production,%;
CSR is the thermal state strength of coke used in the production of the blast furnace,%;
FC is used for injecting mixed coal powder into the blast furnace for production, wherein the fixed carbon content is percent;
TFe is the grade of total iron in the raw materials used for producing the blast furnace;
k1is a coefficient, the value range is 1.50-1.64, and the dimension is m-1·min-3；
k2Is a coefficient, the value range is 1.50-1.64, and the dimension is m2；
k3Is a coefficient, the value range is 2.20-2.40, and the dimension is m-2；
k4The coefficient is 6.61-6.89, and the dimension is kPa2.7·m-2；
k5Is a coefficient, the value range is 4.40-4.58, and the dimension is m2。
2. The method as claimed in claim 1, wherein the effective furnace volume of the blast furnace is 400m3～6000m3The blast furnace of (1).
3. Blast furnace production assembly according to claim 1The method for selecting the area of the body tuyere is characterized in that the control range of the blast-furnace hot air blowing amount in the production is 800m3/min～9500m3/min。
4. The method for selecting the total tuyere area in the blast furnace production as claimed in claim 1, wherein the control range of blast hot air pressure of the blast furnace in the production is 160kPa to 600 kPa.
5. The method for selecting the total tuyere area in the blast furnace production as claimed in claim 1, wherein the control range of the differential pressure between the upper portion and the lower portion of the blast furnace in the production is 80kPa to 260 kPa.
6. The method for selecting the total tuyere area in the blast furnace production as claimed in claim 1, wherein the control range of the blast furnace oxygen enrichment rate in the production is 0-12%.
7. The method for selecting the total tuyere area in the blast furnace production as claimed in claim 1, wherein the control range of the hot strength of the coke used in the blast furnace production is 45-75%.
8. The method for selecting the total tuyere area in the blast furnace production as claimed in claim 1, wherein the control range of the fixed carbon content of the mixed pulverized coal injected into the blast furnace in the production is 60-85%.
9. The method for selecting the total tuyere area in the blast furnace production as claimed in claim 1, wherein the blast furnace raw material is two materials of sinter and pellet, or two materials of sinter and lump, or three materials of sinter, pellet and lump.
10. The method for selecting the total tuyere area in the blast furnace production as claimed in claim 1, wherein the control range of the total iron grade in the raw materials fed into the blast furnace in the production is 45-62%.
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| CN114107585A (en) * | 2021-11-29 | 2022-03-01 | 武汉钢铁有限公司 | Method for quantifying oxygen-rich amount of blast furnace and air inlet area of tuyere |
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| CN114107585A (en) * | 2021-11-29 | 2022-03-01 | 武汉钢铁有限公司 | Method for quantifying oxygen-rich amount of blast furnace and air inlet area of tuyere |
| CN114107585B (en) * | 2021-11-29 | 2022-09-23 | 武汉钢铁有限公司 | Method for quantifying oxygen-rich amount of blast furnace and air inlet area of tuyere |
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