Calculation method of blast furnace operating coke ratio

Abstract

The invention relates to the field of blast furnace production, in particular to a blast furnace operating coke ratio calculation method which comprises the following steps: step 1, determining the batch number of raw materials which are combusted at a current tuyere; 2, according to the volume conservation, calculating the accumulated batch number of the i variable material consumed in unit time of 1 h; 3, calculating the equal coke amount of accumulated consumed coke and coke nuts in unit time, and calculating the total iron amount in and out of the furnace; 4, determining hot air energy equivalent coke mass; 5, determining water dissipation energy equivalent coke mass; step 6, determining coal gas dissipated energy equivalent coke mass; 7, determining the equal coke mass of the pulverized coal; 8, calculating the operating coke ratio of the blast furnace; the operating coke ratio calculated by the method can better reflect the current state of the blast furnace, hot air energy, coal gas dissipation and water dissipation parameters are quantified, and the obtained operating coke ratio can fully reflect the energy consumption level of the blast furnace.

Description

Technical Field

[0001] This invention relates to the field of blast furnace production, and in particular to a method for calculating the coke ratio in blast furnace operation. Background Technology

[0002] The operating coke ratio refers to the amount of coke (dry basis) consumed by the blast furnace for every ton of pig iron produced. This value is calculated after determining the various state functions of the blast furnace and guided by heat balance. It can truly reflect the energy consumption status and direct reduction degree of the blast furnace.

[0003] However, in actual production operations, due to limitations in sensor settings and information transmission and processing, obtaining the theoretical coke ratio in real time is impractical. Foremen often use a few simple parameters of the current furnace charge to simplify calculations and obtain the operating coke ratio. Therefore, the calculated operating coke ratio cannot reflect the current state. (The current furnace charge has not yet reached the combustion zone; using the parameters of the current furnace charge cannot reflect the current state.)

[0004] In addition, the existing simplified calculations do not quantify the parameters of hot air energy, gas dissipation, and water dissipation, resulting in the obtained operating coke ratio not fully reflecting the energy consumption level of the blast furnace.

[0005] Current widely studied neural network prediction models require training on large-scale datasets. Deploying such a system poses a significant challenge to established production systems, requiring complete decoupling from the original system before separate deployment, resulting in extremely high human and material costs.

[0006] Therefore, a method for calculating the coke ratio in blast furnace operation is proposed. Summary of the Invention

[0007] To overcome the shortcomings of existing technologies, the technical problem solved by this invention is to provide a method for calculating the operating coke ratio of a blast furnace. This method first determines the number of batches of raw materials currently being burned at the tuyeres, and then uses the relevant parameters of the currently burning raw materials to calculate the operating coke ratio, which better reflects the current state of the blast furnace. Furthermore, this method quantifies the parameters of hot blast energy, gas dissipation, and water dissipation, and the obtained operating coke ratio can fully reflect the energy consumption level of the blast furnace.

[0008] To achieve the above objectives, the present invention employs the following technical solution:

[0009] A method for calculating the coke ratio in blast furnace operation includes the following steps:

[0010] Step 1: Determine the number of batches of raw materials currently burning at the vent. The specific formula is as follows:

[0011] (1)

[0012] (2)

[0013] (3)

[0014] (4)

[0015] In the formula: —Effective volume of blast furnace, m 3 ;

[0016] —The cumulative number of batches of the i-th type of variable material;

[0017] —The volume of a single batch of the i-th type of variable material, m 3 ;

[0018] —The mass of the j-th raw material in the i-th type of material, in kg;

[0019] —The bulk density of the j-th raw material in the i-th type of feedstock, in kg·m³ -3 ;

[0020] — Charge compression ratio;

[0021] —Total number of batches of material in the furnace;

[0022] —The current number of batches of raw materials being fed into the furnace;

[0023] —The number of batches of raw materials currently being used in the current hot spot;

[0024] Step 2: Based on the law of conservation of volume, calculate the cumulative number of batches of the i-th type of variable material consumed per unit time (1 hour); the specific formula is as follows:

[0025] (5)

[0026] (6)

[0027] (7)

[0028] In the formula: —The cumulative volume of raw materials fed into the furnace per unit time, in meters. 3 ;

[0029] —The cumulative number of batches of the i-th type of variable material fed into the furnace per unit time;

[0030] —The volume of a single batch of the i-th type of variable material, m 3 ;

[0031] —The cumulative volume of raw materials consumed per unit time, in meters. 3 ;

[0032] —The cumulative number of batches of the i-th type of variable material consumed per unit time;

[0033] —The volume of a single batch of the i-th type of variable material, m 3 ;

[0034] in accordance with It can retrieve relevant parameters of the currently burning raw materials;

[0035] Step 3: Calculate the cumulative coke consumption per unit time, the amount of coke equivalent to coke briquettes, and the total amount of iron fed into the furnace.

[0036] (8)

[0037] (9)

[0038] (10)

[0039] In the formula:

[0040] , —The amount of coke and coke briquettes per unit time, in kg·h -1 ;

[0041] , —The mass of coke and coke fed into the furnace with the i-th type of feedstock per unit time, in kg·h -1 ;

[0042] —Iron production per unit time, t·h -1 ;

[0043] —Equivalent coke conversion factor for jiaoding;

[0044] —The amount of iron ore fed into the furnace with the i-th type of variable feedstock per unit time, t·h -1 ;

[0045] —The iron content of the i-th type of iron-bearing mineral.

[0046] Step 4: Determine the equivalent coke mass for hot air energy;

[0047] (11)

[0048] In the formula: —Equivalent coke mass of hot air energy, kg·h -1 ;

[0049] —Standard calorific value of coke, kJ·kg -1 ;

[0050] —Cool air flow rate, m 3 ·min -1 ;

[0051] —Air density under standard conditions: 1.293 kg·m³ -3 ;

[0052] —Cool air pressure, kPa;

[0053] —Standard atmospheric pressure, 101.325 kPa;

[0054] —Cold air temperature, K;

[0055] —Specific heat capacity of air, 1.007 kJ·kg -1 ·K -1 ;

[0056] — Temperature difference between hot and cold air, K;

[0057] Step 5: Determine the equivalent coke mass for water dissipation energy;

[0058] (12)

[0059] In the formula: —Equivalent coke mass for water dissipation energy, kg·h -1 ;

[0060] —Standard calorific value of coke, kJ·kg -1 ;

[0061] —Cooling water flow rate, m 3 ·h -1 ;

[0062] —Water density, 1000 kg·m -3 ;

[0063] —Specific heat capacity of water, 4.18 kJ·kg -1 ·K -1 ;

[0064] —Cooling water inlet and outlet temperature difference, K;

[0065] Step 6: Determine the equivalent coke mass for the energy dissipated by the coal gas;

[0066] (13)

[0067] In the formula: —Equivalent coke mass of gas dissipation energy, kg;

[0068] —Standard calorific value of coke, kJ·kg -1 ;

[0069] —Cool air flow rate, m 3 ·min -1 ;

[0070] —Cool air pressure, kPa;

[0071] —Top pressure, kPa;

[0072] —Standard pressure, 100 kPa;

[0073] —Cold air temperature, K;

[0074] ——Top temperature, K;

[0075] —Standard temperature, 273.15K;

[0076] —Standard calorific value of carbon monoxide, kJ·kg -1 ;

[0077] — Volume fraction of CO in the top gas, vol%

[0078] Step 7: Determine the equivalent coke quality of the pulverized coal;

[0079] (14)

[0080] In the formula: —The equivalent amount of coke produced by pulverized coal injection per unit time, t·h -1 ;

[0081] —Equivalent coke conversion factor for pulverized coal;

[0082] — The amount of pulverized coal injected per unit time n hours ago;

[0083] Step 8: Calculate the coke ratio for blast furnace operation;

[0084] (15)

[0085] in,

[0086] (16)

[0087] Combining steps three through seven, the coke ratio for blast furnace operation is obtained.

[0088] The compression rate of the furnace charge ranges from 80% to 85%.

[0089] In the unit time injection rate of pulverized coal n hours ago, n is usually taken as 2.5~4.5h.

[0090] The relevant parameters are the iron content of the ore, the iron content of the ore, the coke quality, and the coke weight.

[0091] Compared with the prior art, the beneficial effects of the present invention are:

[0092] Compared to traditional algorithms that calculate the raw materials fed into the furnace and the current amount of pulverized coal injected, the method of this invention first determines the number of batches of raw materials currently burning at the tuyeres. It then uses relevant parameters of the currently burning raw materials to calculate the operating coke ratio, which better reflects the current state of the blast furnace. Furthermore, this method quantifies hot blast energy, gas dissipation, and water dissipation parameters, and delays the pulverized coal injection to match thermal inertia, making the equivalent coke amount more accurate. The resulting operating coke ratio fully reflects the energy consumption level of the blast furnace. Compared to existing large-scale model algorithms such as neural networks for predicting furnace temperature, this invention's algorithm significantly improves the accuracy of coke ratio changes at almost zero cost without introducing a new system. Attached Figure Description

[0093] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0094] Figure 1 This is a graph showing the coke ratio-furnace temperature variation in Example 1.

[0095] Figure 2 This is a graph showing the coke ratio-furnace temperature variation in Example 2.

[0096] Figure 3 This is the coke ratio-furnace temperature variation diagram for Example 3. Detailed Implementation

[0097] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings:

[0098] Example 1:

[0099] Taking the furnace condition of Ansteel's No. 3 blast furnace on a certain day as an example: Table 1 is the actual production and material change table of the furnace, Table 2 is the blast furnace charging table, and Table 3 is the blast furnace operating parameters.

[0100] Table 1

[0101]

[0102] Table 2

[0103]

[0104] Table 3

[0105]

[0106] A method for calculating the coke ratio in blast furnace operation includes the following steps:

[0107] Step 1: Determine the number of batches of raw materials currently being burned at the air vent;

[0108] In this embodiment, the effective volume of the blast furnace is V = 2650.9 m³. 3 The bulk density of the sintered ore is 1.8 t / m³. 3 The bulk density of the ore pellets is 2.0 t / m³. 3 The bulk density of coke and coke briquettes is 0.45 t / m³. 3 The furnace charge compression rate δ is 84%. Based on the variable charge table 1 and equations (1) to (3), the following can be derived: =66. According to Table 2, at 12:00 =158, according to equation (4) we can obtain =92.

[0109] Step 2: Based on the law of conservation of volume, calculate the cumulative number of batches of the i-th type of variable material consumed per unit time (1 hour);

[0110] According to Table 2, 13 batches of materials were fed within 1 hour from 12:00 to 13:00. and After locating the corresponding raw material information in the variable material table 1, calculate the results according to formulas (2), (5) to (7). =13.01911.

[0111] Step 3: Calculate the cumulative coke consumption per unit time, the amount of coke equivalent to coke briquettes, and the total amount of iron fed into the furnace.

[0112] =0.9 based on variable material table 1 and Substituting into equations (8) to (10), we obtain:

[0113] =120.42t / h, =6.51 t / h, =344.88t / h.

[0114] Step 4: Determine the equivalent coke mass for hot air energy;

[0115] According to Table 3, within 1 hour from 12:00 to 13:00: =5884.103 m 3 ·min -1 , =419.827 kPa, =220℃, =985K, =28242 KJ·kg -1 , =1.293 kg·m -3 , =1.007 kJ·kg -1 ·K -1 Substituting into equation (11), we get: =36.31t / h.

[0116] Step 5: Determine the equivalent coke mass for water dissipation energy;

[0117] According to Table 3, within 1 hour from 12:00 to 13:00: =4200 m 3 ·h -1 , =4.95K, =4.18 kJ·kg -1 ·K -1 , =1000 kg·m -3 , =28242 KJ·kg -1 Substituting into equation (12), we get: =-3.10t / h.

[0118] Step 6: Determine the equivalent coke mass for the energy dissipated by the coal gas;

[0119] According to Table 3, within 1 hour from 12:00 to 13:00: =5884.103 m 3 ·min -1 , =419.827 kPa, =222 kPa, =220℃, =173.61℃, =23.4%, =28242 KJ·kg -1 , =100 kPa, =273.15K, =10070 kJ·kg -1 Substituting into equation (13), we get:

[0120] =-8.97t / h.

[0121] Step 7: Determine the equivalent coke quality of the pulverized coal;

[0122] Within 1 hour from 12:00 to 13:00: the delay time n is taken as 3 hours. This value is negatively correlated with the oxygen enrichment rate, i.e., from 9:00 to 10:00. Refer to Table 2 for details. =57.6t / h, =0.8. Substituting into equation (14), we get =46.08 t / h.

[0123] Step 8: Calculate the coke ratio for blast furnace operation;

[0124] Substituting the results from steps one through seven into equation (16), we obtain... =197.25t / h.

[0125] Therefore, K = 571 kg / t Fe is obtained from equation (15).

[0126] Calculate the remaining hourly data using the steps described above, and obtain... Figure 1 .

[0127] from Figure 1 As can be seen, in region I, the furnace temperature (silicon content) shows an upward trend, while the coke ratio obtained by the existing simplified calculation method (original algorithm) shows a downward trend. In region II, the furnace temperature (silicon content) shows a downward trend, while the coke ratio obtained by the existing simplified calculation method shows an upward trend. The trend of the algorithm (new algorithm) of the present invention in both regions is consistent with the actual furnace temperature trend.

[0128] Example 2:

[0129] Taking the furnace condition of Ansteel's No. 1 blast furnace on a certain day as an example: Table 4 is the actual production material change table of the furnace, Table 5 is the blast furnace charging table, and Table 6 is the blast furnace operating parameters.

[0130] Table 4

[0131]

[0132] Table 5

[0133]

[0134] Table 6

[0135]

[0136] A method for calculating the coke ratio in blast furnace operation includes the following steps:

[0137] Step 1: Determine the number of batches of raw materials currently being burned at the air vent;

[0138] In this embodiment, the effective volume of the blast furnace is V = 2648.0 m³. 3 The bulk density of the sintered ore is 1.8 t / m³. 3 The bulk density of the ore pellets is 2.0 t / m³. 3 The bulk density of coke and coke briquettes is 0.45 t / m³. 3 The furnace charge compression rate δ is 84%. Based on the variable charge table 4 and equations (1) to (3), the following can be derived: =78. 8:00 =97, according to equation (4) we can obtain =19.

[0139] Step 2: Based on the law of conservation of volume, calculate the cumulative number of batches of the i-th type of variable material consumed per unit time (1 hour);

[0140] According to Table 5, 12 batches of materials were fed within 1 hour from 7:00 to 8:00. and After locating the corresponding raw material information in the variable material table, calculate the results according to formulas (2), (5), and (7). =12.0126.

[0141] Step 3: Calculate the cumulative coke consumption per unit time, the amount of coke equivalent to coke briquettes, and the total amount of iron fed into the furnace.

[0142] =0.9 based on variable material table 4 and Substituting into equations (8) to (10), we obtain:

[0143] =95.40t / h, =7.80 t / h, =254.12t / h.

[0144] Step 4: Determine the equivalent coke mass for hot air energy;

[0145] According to Table 6, within 1 hour from 7:00 to 8:00: =5460 m 3 ·min -1 , =408.16 kPa, =225℃, =970K, =28242 KJ·kg -1 , =1.293 kg·m -3 , =1.007 kJ·kg -1 ·K -1 Substituting into equation (11), we get: =32.33t / h.

[0146] Step 5: Determine the equivalent coke mass for water dissipation energy;

[0147] According to Table 6, within 1 hour from 7:00 to 8:00: =4030 m 3 ·h -1 , =6.06K, =4.18 kJ·kg -1 ·K -1 , =1000 kg·m -3 , =28242 KJ·kg -1 Substituting into equation (12), we get: =-3.63t / h.

[0148] Step 6: Determine the equivalent coke mass for the energy dissipated by the coal gas;

[0149] According to Table 6, within 1 hour from 7:00 to 8:00: =5460 m 3 ·min -1 , =408.16 kPa, =210 kPa, =225℃, =200.45℃, =22.3%, =28242 KJ·kg -1 , =100 kPa, =273.15K, =10070 kJ·kg -1 Substituting into equation (13), we get: =-9.76t / h.

[0150] Step 7: Determine the equivalent coke quality of the pulverized coal;

[0151] Within 1 hour from 7:00 to 8:00: the delay time n is taken as 3 hours, i.e., from 4:00 to 5:00. Referring to Table 5, we can see... =51t / h, =0.8. Substituting into equation (14), we get =40.8 t / h.

[0152] Step 8: Calculate the coke ratio for blast furnace operation;

[0153] Substituting the results from steps one through seven into equation (16), we obtain... =197.25t / h.

[0154] Therefore, K = 638 kg / t Fe is obtained from equation (15).

[0155] Calculate the remaining hourly data using the steps described above, and obtain... Figure 2 .

[0156] from Figure 2 As can be seen, in Region I, the furnace temperature (silicon content) shows a continuous upward trend, while the coke ratio obtained by the existing simplified calculation method shows a trend of first rising and then falling. In Region II, the furnace temperature (silicon content) shows a downward trend, while the coke ratio obtained by the existing simplified calculation method shows a gradual transition followed by an upward trend. In Region III, the furnace temperature changes very little, while the coke ratio obtained by the existing simplified calculation method shows an excessively large change. The trend of the algorithm results of this invention in all three regions is consistent with the actual furnace temperature trend, and can fully reflect the energy consumption level of the blast furnace.

[0157] Example 3:

[0158] Taking the furnace condition of Ansteel's No. 11 blast furnace on a certain day as an example: Table 7 is the actual production material change table of the furnace, Table 8 is the blast furnace charging table, and Table 9 is the blast furnace operating parameters.

[0159] Table 7

[0160]

[0161] Table 8

[0162]

[0163] Table 9

[0164]

[0165] A method for calculating the coke ratio in blast furnace operation includes the following steps:

[0166] Step 1: Determine the number of batches of raw materials currently being burned at the air vent;

[0167] In this embodiment, the effective volume of the blast furnace is V = 2464.0 m³. 3 The bulk density of the sintered ore is 1.8 t / m³. 3 The bulk density of the ore pellets is 2.0 t / m³. 3 The bulk density of coke and coke briquettes is 0.45 t / m³. 3 The furnace charge was compressed by δ=84%. Based on the variable charge table 7 and equations (1)~(3), we can conclude that... =81. 1:00 =13, according to equation (4) we can obtain The figure was 219 yesterday.

[0168] Step 2: Based on the law of conservation of volume, calculate the cumulative number of batches of the i-th type of variable material consumed per unit time (1 hour);

[0169] According to Table 8, 13 batches of materials were fed within 1 hour from 0:00 to 1:00. and After locating the corresponding raw material information in the variable material table, calculate the results according to formulas (2), (5), and (7). =11.65689283.

[0170] Step 3: Calculate the cumulative coke consumption per unit time, the amount of coke equivalent to coke briquettes, and the total amount of iron fed into the furnace.

[0171] =0.9 based on the variable material table and Substituting into equations (8) to (10), we obtain:

[0172] =89.18t / h, =5.25 t / h, =220.78t / h.

[0173] Step 4: Determine the equivalent coke mass for hot air energy;

[0174] According to Table 9, within 1 hour from 0:00 to 1:00: =5359 m 3 ·min -1 , =371.7 kPa, =178℃, =975K, =28242 KJ·kg -1 , =1.293 kg·m -3 , =1.007 kJ·kg-1 ·K -1 Substituting into equation (11), we get: =32.09t / h.

[0175] Step 5: Determine the equivalent coke mass for water dissipation energy;

[0176] According to Table 9, within 1 hour from 0:00 to 1:00: =4028 m 3 ·h -1 , =2.375K, =4.18 kJ·kg -1 ·K -1 , =1000 kg·m -3 , =28242 KJ·kg -1 Substituting into equation (12), we get: =-1.42t / h.

[0177] Step 6: Determine the equivalent coke mass for the energy dissipated by the coal gas;

[0178] According to Table 9, within 1 hour from 0:00 to 1:00: =5359m 3 ·min -1 , =371.7 kPa, =196 kPa =178℃, =203.4℃, =24.4%, =28242 KJ·kg -1 , =100 kPa, =273.15K, =10070 kJ·kg -1 Substituting into equation (13), we get: =-6.91t / h.

[0179] Step 7: Determine the equivalent coke quality of the pulverized coal;

[0180] Within 1 hour from 0:00 to 1:00: The delay time n is 3 hours, i.e., yesterday from 21:00 to 22:00. This can be found by referring to the material loading schedule. =39t / h, =0.8. Substituting into equation (14), we get =31.2 t / h.

[0181] Step 8: Calculate the coke ratio for blast furnace operation;

[0182] Substituting the results from steps one through seven into equation (16), we obtain... =149.39t / h.

[0183] Therefore, K = 676 kg / t Fe is obtained from equation (15).

[0184] Calculate the remaining hourly data using the steps described above, and obtain... Figure 3 .

[0185] from Figure 3 As can be seen, in region I, the furnace temperature (silicon content) shows a continuous downward trend, while the coke ratio obtained by the existing simplified calculation method shows a trend of first rising and then falling. In region II, the furnace temperature (silicon content) shows a significant upward trend, while the coke ratio obtained by the existing simplified calculation method shows a slower upward trend. The trend of the algorithm results of the present invention in both regions is consistent with the actual furnace temperature trend, which can fully reflect the energy consumption level of the blast furnace.

[0186] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solutions of the present invention, and these simple modifications all fall within the protection scope of the present invention. Furthermore, it should be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately. In addition, various different embodiments of the present invention can also be arbitrarily combined, as long as they do not violate the spirit of the present invention, and should also be considered as the content disclosed by the present invention.

Claims

1. A method for calculating the coke ratio in blast furnace operation, characterized in that, Includes the following steps: Step 1: Determine the number of batches of raw materials currently burning at the vent. The specific formula is as follows: （1） （2） （3） （4） In the formula: —Effective volume of blast furnace, m 3 ; —The cumulative number of batches of the i-th type of variable material; —The volume of a single batch of the i-th type of variable material, m 3 ; —The mass of the j-th raw material in the i-th type of material, in kg; —The bulk density of the j-th raw material in the i-th type of feedstock, in kg·m³ -3 ; — Charge compression ratio; —Total number of batches of material in the furnace; —The current number of batches of raw materials being fed into the furnace; —The number of batches of raw materials currently being used in the market; Step 2: Based on the law of conservation of volume, calculate the cumulative number of batches of the i-th type of variable material consumed per unit time (1 hour); the specific formula is as follows: （5） （6） （7） In the formula: —The cumulative volume of raw materials fed into the furnace per unit time, in meters. 3 ; —The cumulative number of batches of the i-th type of variable material fed into the furnace per unit time; —The volume of a single batch of the i-th type of variable material, m 3 ; —The cumulative volume of raw materials consumed per unit time, in meters. 3 ; —The cumulative number of batches of the i-th type of variable material consumed per unit time; —The volume of a single batch of the i-th type of variable material, m 3 ; in accordance with It can retrieve relevant parameters of the currently burning raw materials; Step 3: Calculate the cumulative coke consumption per unit time, the amount of coke equivalent to coke briquettes, and the total amount of iron fed into the furnace. （8） （9） （10） In the formula: , —The amount of coke and coke briquettes per unit time, in kg·h -1 ; , —The mass of coke and coke fed into the furnace with the i-th type of feedstock per unit time, in kg·h -1 ; —Iron production per unit time, t·h -1 ; —Equivalent coke conversion factor for jiaoding; —The amount of iron ore fed into the furnace with the i-th type of variable feedstock per unit time, t·h -1 ; —The iron content of the i-th type of iron-bearing mineral. Step 4: Determine the equivalent coke mass for hot air energy; （11） In the formula: —Equivalent coke mass of hot air energy, kg·h -1 ; —Standard calorific value of coke, kJ·kg -1 ; —Cool air flow rate, m 3 ·min -1 ; —Air density under standard conditions: 1.293 kg·m³ -3 ; —Cool air pressure, kPa; —Standard atmospheric pressure, 101.325 kPa; —Cold air temperature, K; —Specific heat capacity of air, 1.007 kJ·kg -1 ·K -1 ; — Temperature difference between hot and cold air, K; Step 5: Determine the equivalent coke mass for water dissipation energy; （12） In the formula: —Equivalent coke mass for water dissipation energy, kg·h -1 ; —Standard calorific value of coke, kJ·kg -1 ; —Cooling water flow rate, m 3 ·h -1 ; —Water density, 1000 kg·m -3 ; —Specific heat capacity of water, 4.18 kJ·kg -1 ·K -1 ; —Cooling water inlet and outlet temperature difference, K; Step 6: Determine the equivalent coke mass for the energy dissipated by the coal gas; （13） In the formula: —Equivalent coke mass of gas dissipation energy, kg; —Standard calorific value of coke, kJ·kg -1 ; —Cool air flow rate, m 3 ·min -1 ; —Cool air pressure, kPa; —Top pressure, kPa; —Standard pressure, 100 kPa; —Cold air temperature, K; ——Top temperature, K; —Standard temperature, 273.15K; —Standard calorific value of carbon monoxide, kJ·kg -1 ; — CO volume fraction in the top gas, vol% Step 7: Determine the equivalent coke quality of the pulverized coal; （14） In the formula: —The equivalent amount of coke produced by pulverized coal injection per unit time, t·h -1 ; —Equivalent coke conversion factor for pulverized coal; — The amount of pulverized coal injected per unit time n hours ago; Step 8: Calculate the coke ratio for blast furnace operation; （15） in, （16） Combining steps three through seven, the coke ratio for blast furnace operation is obtained.

2. The method for calculating the coke ratio in blast furnace operation according to claim 1, characterized in that, The compression rate of the furnace charge ranges from 80% to 85%.

3. The method for calculating the coke ratio in blast furnace operation according to claim 1, characterized in that, In the unit time injection rate of pulverized coal n hours ago, n is usually taken as 2.5~4.5h.

4. The method for calculating the coke ratio in blast furnace operation according to claim 1, characterized in that, The relevant parameters are the iron content of the ore, the iron content of the ore, the coke quality, and the coke weight.

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