Method for grading coke according to coke components

Abstract

The invention discloses a method for grading coke according to coke components, which comprises the following steps of: (1) setting a quality index reference line and a weight score of each component according to historical data of the coke components; (2) setting a quality index upper limit value, a quality index lower limit value and a corresponding assignment value of each component according to the quality index datum line and the weight score of each component, and obtaining a binary linear equation about the quality index value and the quality index score of each component; (3) setting a coke grading rule according to the comprehensive score of the quality index of the coke; (4) substituting the actual value of the quality index of each component of the coke to be scored and graded into the binary linear equation, calculating the actual score corresponding to the quality index of each component of the coke to be scored and graded, and obtaining the actual comprehensive score; and (5) grading and ranking the coke to be graded and graded by combining the actual comprehensive score of the coke to be graded and graded. According to the invention, the coke can be conveniently distinguished and matched for use, so that the blast furnace obtains good technical and economic indexes.

Description

Technical Field

[0001] The invention relates to the technical field of coke oven production, and in particular to a method for scoring and grading coke according to coke components. Background Art

[0002] Coal is heated to 950-1050℃ in an airtight condition, and finally made into coke after going through stages such as drying, pyrolysis, melting, bonding, solidification, and shrinkage. This process is called high-temperature coking (high-temperature distillation). The coke obtained by high-temperature coking is used for blast furnace smelting, casting, and gasification.

[0003] Due to the different quality of raw materials used in coking, and the changes in the proportion of gas coal, main coking coal, fat coal, 1 / 3 coking coal, and lean coal, the quality of coke also varies. When using a blast furnace, it is best to distinguish between cokes of different qualities so that they can be used together, so that the blast furnace can achieve good technical and economic indicators; at the same time, scoring and grading coke is also conducive to guiding the procurement department to purchase high-quality and cost-effective coke, which is conducive to reducing costs and increasing efficiency of steel mills. Therefore, how to score and grade coke has become a difficult problem that needs to be solved urgently. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a method for scoring and grading coke according to its composition, so as to facilitate the differentiation of coke for matching and use, thereby enabling the blast furnace to achieve good technical and economic indicators.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solution: A method for grading coke according to coke composition of the present invention has the following innovative features:

[0006] (1) Based on the historical data of coke composition, the quality index baseline of each component and its corresponding weight score are set;

[0007] (2) According to the quality index baseline of each component and its corresponding weight score, the upper limit value, lower limit value and corresponding score value of the quality index of each component are set, and then the data group consisting of the upper limit value, lower limit value and corresponding score value of the quality index of each component is used to obtain the two-variable linear equation about the quality index value of each component and its quality index score, and the slope a and intercept b corresponding to the two-variable linear equation about each component are calculated;

[0008] (3) Setting coke classification rules based on the comprehensive scores of coke quality indicators;

[0009] (4) Substituting the actual numerical value of the quality index of each component of the graded coke to be scored into the binary linear equation of the above step (2), and then using the slope a and intercept b corresponding to the binary linear equation of each component to calculate the actual score corresponding to the quality index of each component of the graded coke to be scored, and obtaining the actual comprehensive score of the graded coke to be scored;

[0010] (5) According to the coke grading principle of the above step (3), combined with the actual comprehensive score of the coke to be graded, the coke to be graded is further graded and ranked.

[0011] Preferably, in the above step (1), a good coke quality index baseline and a poor coke quality index baseline are set according to the best index and the worst index of coke in the past 20 months, specifically:

[0012] (1.1) The baseline of good coke quality indicators is moisture: 5%, ash: 12.5%, volatile matter: 1.3%, fixed carbon: 86.2%, sulfur: 0.7%, drum strength: 93.5%, anti-wear index: 4.5%, reactivity: 28.5%, post-reaction strength: 63.5%, particle size less than 25mm: 6.3%, particle size greater than 40mm: 65%;

[0013] (1.2) The baseline for poor coke quality indicators is as follows: moisture: 15%, ash: 14.6%, volatile matter: 1.8%, fixed carbon: 83.6%, sulfur: 1.4%, drum strength: 78%, anti-wear index: 10%, reactivity: 35%, post-reaction strength: 55%, percentage of particle size less than 25 mm: 12%, percentage of particle size greater than 40 mm: 50%.

[0014] Preferably, among the quality indicators of the above-mentioned components, the moisture content is calculated by the standard single method of all water, that is, the weight loss is calculated after a certain period of time at a constant temperature; the ash content, volatile matter and fixed carbon are obtained by industrial fluorescence detection and analysis, and the sum of them must be equal to 100%; the sulfur content is calculated by the standard single method of all sulfur; the drum strength and anti-wear index are cold strength indicators, which are obtained by screening with sieves of different apertures; the reactivity and post-reaction strength are hot strength indicators, which are measured at a certain high temperature; the proportion of particles less than 25 mm and the proportion of particles greater than 40 mm are obtained by screening with sieves of different apertures.

[0015] Preferably, in the above step (1), the weight points corresponding to the quality indicators of each component are set according to the importance of the quality indicators of the above components on the blast furnace, specifically, moisture: 10 points, ash: 10 points, volatile matter: 5 points, fixed carbon: 5 points, sulfur: 5 points, drum strength: 5 points, anti-wear index: 10 points, reactivity: 15 points, post-reaction strength: 15 points, proportion of particle size less than 25 mm: 10 points, proportion of particle size greater than 40 mm: 10 points.

[0016] Preferably, in the above step (2), according to the principle that the higher the four indicators of fixed carbon, drum strength, post-reaction strength, and the proportion of particles larger than 40 mm, the better, and the lower the seven indicators of moisture, ash, volatile matter, sulfur, anti-wear index, reactivity, and the proportion of particles smaller than 25 mm, the better, the upper limit value, lower limit value and corresponding scoring value of the quality index of each component are specifically set as follows:

[0017] (2.1) The upper limit of the water content quality index is 15%, and its corresponding score is 0 points; the lower limit of the water content quality index is 5%, and its corresponding score is 10 points;

[0018] (2.2) The upper limit of the ash content quality index is 14.6%, and its corresponding score is 0 points; the lower limit of the ash content quality index is 12.5%, and its corresponding score is 10 points;

[0019] (2.3) The upper limit of the quality index of volatile matter is 1.8%, and its corresponding score is 0 points; the lower limit of the quality index of volatile matter is 1.3%, and its corresponding score is 5 points;

[0020] (2.4) The upper limit of the quality index of fixed carbon is 86.2%, and its corresponding score is 5 points; the lower limit of the quality index of fixed carbon is 83.6%, and its corresponding score is 0 points;

[0021] (2.5) The upper limit of the sulfur content quality index is 1.4%, and its corresponding score is 0 points; the lower limit of the sulfur content quality index is 0.7%, and its corresponding score is 5 points;

[0022] (2.6) The upper limit of the quality index of drum strength is 93.5%, and its corresponding score is 5 points; the lower limit of the quality index of drum strength is 78%, and its corresponding score is 0 points;

[0023] (2.7) The upper limit of the quality index of the anti-wear index is 10%, and its corresponding score is 0 points; the lower limit of the quality index of the anti-wear index is 4.5%, and its corresponding score is 10 points;

[0024] (2.8) The upper limit of the quality index of reactivity is 35%, and its corresponding score is 0 points; the lower limit of the quality index of reactivity is 28.5%, and its corresponding score is 15 points;

[0025] (2.9) The upper limit of the quality index of post-reaction strength is 63.5%, and its corresponding score is 15 points; the lower limit of the quality index of post-reaction strength is 55%, and its corresponding score is 0 points;

[0026] (2.10) The upper limit of the quality index for the proportion of particles smaller than 25 mm is 12%, and the corresponding score is 0; the lower limit of the quality index for the proportion of particles smaller than 25 mm is 6.3%, and the corresponding score is 10;

[0027] (2.11) The upper limit of the quality index for the proportion of particles larger than 40 mm is 65%, and the corresponding score is 10 points; the lower limit of the quality index for the proportion of particles larger than 40 mm is 50%, and the corresponding score is 0 points.

[0028] Preferably, in the above step (2), the binary linear equation is:

[0029] y=ax+b (1)

[0030] In the formula, y represents the quality index score of each component; x represents the quality index value of each component, a represents the slope of the quality index of each component, and b represents the intercept of the quality index of each component;

[0031] Then, taking water as an example, the upper limit value of the water quality index and the corresponding score value, as well as the lower limit value of the water quality index and the corresponding score value are substituted into the binary linear equation to obtain:

[0032]

[0033] Then the slope of the binary linear equation about water content is calculated to be -1, and its intercept is 15, and the quality index value x about water content is obtained. 水份 Its quality index score y 水份 The linear equation of two variables is:

[0034] y 水份 =-x 水份 +15 (3)

[0035] Similarly:

[0036] The slope of the binary linear equation for ash content is calculated to be -4.76, and its intercept is 69.52, and the quality index value x for ash content is obtained. 灰分 Its quality index score y 灰分 The linear equation of two variables is:

[0037] y 灰分 =-4.76·x 灰分 +69.52 (4)

[0038] The slope of the binary linear equation for volatile matter is calculated to be -10, and its intercept is 18, and the quality index value x for ash is obtained. 挥发分 Its quality index score y 挥发分 The linear equation of two variables is:

[0039] y 挥发分 =-10·x 挥发分 +18 (5)

[0040] The slope of the binary linear equation for fixed carbon was calculated to be 1.92, and its intercept was -160.77, and the quality index value x for ash content was obtained. 固定碳 Its quality index score y 固定碳 The linear equation of two variables is:

[0041] y 固定碳 =1.92·x 固定碳 -160.77 (6)

[0042] The slope of the binary linear equation for sulfur content is calculated to be -7.14, and its intercept is 10, and the quality index value x for ash content is obtained. 硫份 Its quality index score y 硫份 The linear equation of two variables is:

[0043] y 硫份 =-7.14·x 硫份 +10 (7)

[0044] The slope of the quadratic equation for drum strength was calculated to be 0.32, and its intercept was -25.16, and the quality index value x for ash content was obtained. 转鼓强度 Its quality index score y 转鼓强度 The linear equation of two variables is:

[0045] y 转鼓强度 =0.32·x 转鼓强度 -25.16 (8)

[0046] The slope of the quadratic equation for the anti-wear index is calculated to be -1.82, and its intercept is 18.18, and the quality index value x for ash content is obtained. 抗磨指数 Its quality index score y 抗磨指数 The linear equation of two variables is:

[0047] y 抗磨指数 =-1.82·x 抗磨指数 +18.18 (9)

[0048] The slope of the quadratic equation for reactivity was calculated to be -2.31, and its intercept was 80.77, and the quality index value x for ash content was obtained. 反应性 Its quality index score y 反应性 The linear equation of two variables is:

[0049] y 反应性 =-2.31·x反应性 +80.77 (10)

[0050] The slope of the quadratic equation for the post-reaction strength was calculated to be 1.76, and its intercept was -97.06, and the quality index value x for the ash content was obtained. 反应后强度 Its quality index score y 反应后强度 The linear equation of two variables is:

[0051] y 反应后强度 =1.76·x 反应后强度 -97.06 (11)

[0052] The slope of the binary linear equation for the proportion of particles less than 25 mm was calculated to be -1.75, and its intercept was 21.05, and the quality index value x for ash content was obtained. 小于25mm粒度占比 Its quality index score y 小于25mm粒度占比 The linear equation of two variables is:

[0053] y 小于25mm粒度占比 =-1.75·x 小于25mm粒度占比 +21.05 (12)

[0054] The slope of the binary linear equation for the proportion of particles larger than 40 mm was calculated to be 0.67, and its intercept was -33.33, and the quality index value x for ash content was obtained. 大于40mm粒度占比 Its quality index score y 大于40mm粒度占比 The linear equation of two variables is:

[0055] y 大于40mm粒度占比 =0.67·x 大于40mm粒度占比 -33.33 (13)

[0056] Preferably, in the above step (3), the coke classification rule is specifically as follows:

[0057] (3.1) Coke with a comprehensive quality index score of not less than 95 points shall be rated as excellent;

[0058] (3.2) Coke with a comprehensive quality index score of not less than 85 points and less than 95 points shall be rated as good;

[0059] (3.3) Coke with a comprehensive quality index score of not less than 70 points and less than 85 points shall be rated as fair;

[0060] (3.4) Coke with a comprehensive quality index score of not less than 60 points and less than 70 points will be rated as poor;

[0061] (3.5) Coke with a comprehensive quality index score of less than 60 points will be rated as poor.

[0062] Preferably, in the above step (4), according to the principle that the higher the four indicators of fixed carbon, drum strength, post-reaction strength, and the proportion of particles larger than 40 mm, the better, and the lower the seven indicators of moisture, ash, volatile matter, sulfur, anti-wear index, reactivity, and the proportion of particles smaller than 25 mm, the better, the specific method for obtaining the actual comprehensive score of the graded coke to be graded is:

[0063] (4.1) If the actual values ​​of the quality indicators of moisture, ash, volatile matter, sulfur, anti-wear index, reactivity, and the proportion of particles less than 25 mm are less than or equal to their corresponding lower limits, the actual score corresponding to the quality indicator shall be its weight score;

[0064] (4.2) If the actual values ​​of the quality indicators of fixed carbon, drum strength, post-reaction strength, and the proportion of particles larger than 40 mm are greater than or equal to their corresponding upper limits, the actual score corresponding to the quality indicator shall be its weight score;

[0065] (4.3) If the actual value of the quality index of each component is between its corresponding upper limit and lower limit, substitute it into formulas (3) to (13) to calculate the actual score corresponding to the quality index of each component of the graded coke to be scored;

[0066] (4.4) The actual scores corresponding to the quality indicators of each component of the graded coke to be scored are added together to obtain the actual comprehensive score of the graded coke to be scored.

[0067] Beneficial effects of the present invention:

[0068] (1) The present invention facilitates the differentiation of coke for matching and use, thereby enabling the blast furnace to achieve good technical and economic indicators;

[0069] (2) The present invention can guide the purchase of high-quality and cost-effective coke, thereby facilitating cost reduction and efficiency improvement. BRIEF DESCRIPTION OF THE DRAWINGS

[0070] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0071] Figure 1 The present invention is a schematic diagram of a method for grading coke according to its composition. DETAILED DESCRIPTION

[0072] The technical solution of the present invention will be clearly and completely described below through specific implementation methods.

[0073] A method for grading coke according to coke composition of the present invention, such as Figure 1 As shown, the following steps are included:

[0074] (1) Based on the historical data of coke composition, the quality index baseline of each component and its corresponding weight score are set.

[0075] In the above steps, according to the best and worst indicators of coke in the past 20 months, the good coke quality indicator baseline and the poor coke quality indicator baseline are set, specifically:

[0076] (1.1) The baseline of good coke quality indicators is moisture: 5%, ash: 12.5%, volatile matter: 1.3%, fixed carbon: 86.2%, sulfur: 0.7%, drum strength: 93.5%, anti-wear index: 4.5%, reactivity: 28.5%, post-reaction strength: 63.5%, particle size less than 25mm: 6.3%, particle size greater than 40mm: 65%;

[0077] (1.2) The baseline for poor coke quality indicators is as follows: moisture: 15%, ash: 14.6%, volatile matter: 1.8%, fixed carbon: 83.6%, sulfur: 1.4%, drum strength: 78%, anti-wear index: 10%, reactivity: 35%, post-reaction strength: 55%, percentage of particle size less than 25 mm: 12%, percentage of particle size greater than 40 mm: 50%.

[0078] Among the quality indicators of the above-mentioned components, moisture content is calculated by the standard single method of total water, that is, the weight loss is calculated after a certain period of time at a constant temperature; ash content, volatile matter and fixed carbon are obtained by industrial fluorescence detection and analysis, and their sum must be equal to 100%; sulfur content is calculated by the standard single method of total sulfur; drum strength and anti-wear index are cold strength indicators, which are obtained by screening with sieves of different apertures; reactivity and post-reaction strength are hot strength indicators, which are measured at a certain high temperature; the proportion of particle size less than 25mm and the proportion of particle size greater than 40mm are obtained by screening with sieves of different apertures.

[0079] In the above steps, according to the importance of the quality indicators of the above components on the blast furnace, the weight points corresponding to the quality indicators of each component are set, specifically, moisture: 10 points, ash: 10 points, volatile matter: 5 points, fixed carbon: 5 points, sulfur: 5 points, drum strength: 5 points, anti-wear index: 10 points, reactivity: 15 points, post-reaction strength: 15 points, proportion of particle size less than 25 mm: 10 points, proportion of particle size greater than 40 mm: 10 points.

[0080] (2) According to the quality index baseline of each component and its corresponding weight score, the upper limit value, lower limit value and corresponding score value of the quality index of each component are set, and then the data group consisting of the upper limit value, lower limit value and corresponding score value of the quality index of each component is used to obtain the two-variable linear equation about the quality index value of each component and its quality index score, and the slope a and intercept b corresponding to the two-variable linear equation about each component are calculated.

[0081] In the above steps, according to the principle that the higher the four indicators of fixed carbon, drum strength, post-reaction strength, and the proportion of particles larger than 40 mm, the better, and the lower the seven indicators of moisture, ash, volatile matter, sulfur, anti-wear index, reactivity, and the proportion of particles smaller than 25 mm, the better, the upper and lower limits of the quality indicators of each component and their corresponding scoring values ​​are specifically set as follows:

[0082] (2.1) The upper limit of the water content quality index is 15%, and its corresponding score is 0 points; the lower limit of the water content quality index is 5%, and its corresponding score is 10 points;

[0083] (2.2) The upper limit of the ash content quality index is 14.6%, and its corresponding score is 0 points; the lower limit of the ash content quality index is 12.5%, and its corresponding score is 10 points;

[0084] (2.3) The upper limit of the quality index of volatile matter is 1.8%, and its corresponding score is 0 points; the lower limit of the quality index of volatile matter is 1.3%, and its corresponding score is 5 points;

[0085] (2.4) The upper limit of the quality index of fixed carbon is 86.2%, and its corresponding score is 5 points; the lower limit of the quality index of fixed carbon is 83.6%, and its corresponding score is 0 points;

[0086] (2.5) The upper limit of the sulfur content quality index is 1.4%, and its corresponding score is 0 points; the lower limit of the sulfur content quality index is 0.7%, and its corresponding score is 5 points;

[0087] (2.6) The upper limit of the quality index of drum strength is 93.5%, and its corresponding score is 5 points; the lower limit of the quality index of drum strength is 78%, and its corresponding score is 0 points;

[0088] (2.7) The upper limit of the quality index of the anti-wear index is 10%, and its corresponding score is 0 points; the lower limit of the quality index of the anti-wear index is 4.5%, and its corresponding score is 10 points;

[0089] (2.8) The upper limit of the quality index of reactivity is 35%, and its corresponding score is 0 points; the lower limit of the quality index of reactivity is 28.5%, and its corresponding score is 15 points;

[0090] (2.9) The upper limit of the quality index of post-reaction strength is 63.5%, and its corresponding score is 15 points; the lower limit of the quality index of post-reaction strength is 55%, and its corresponding score is 0 points;

[0091] (2.10) The upper limit of the quality index for the proportion of particles smaller than 25 mm is 12%, and the corresponding score is 0; the lower limit of the quality index for the proportion of particles smaller than 25 mm is 6.3%, and the corresponding score is 10;

[0092] (2.11) The upper limit of the quality index for the proportion of particles larger than 40 mm is 65%, and the corresponding score is 10 points; the lower limit of the quality index for the proportion of particles larger than 40 mm is 50%, and the corresponding score is 0 points.

[0093] In the above steps, the linear equation with two variables is:

[0094] y=ax+b (1)

[0095] In the formula, y represents the quality index score of each component; x represents the quality index value of each component, a represents the slope of the quality index of each component, and b represents the intercept of the quality index of each component;

[0096] Then, taking water as an example, the upper limit value of the water quality index and the corresponding score value, as well as the lower limit value of the water quality index and the corresponding score value are substituted into the binary linear equation to obtain:

[0097]

[0098] Then the slope of the binary linear equation about water content is calculated to be -1, and its intercept is 15, and the quality index value x about water content is obtained. 水份 Its quality index score y 水份 The linear equation of two variables is:

[0099] y 水份 =-x 水份 +15 (3)

[0100] Similarly:

[0101] The slope of the binary linear equation for ash content is calculated to be -4.76, and its intercept is 69.52, and the quality index value x for ash content is obtained. 灰分 Its quality index score y 灰分 The linear equation of two variables is:

[0102] y 灰分 =-4.76·x 灰分 +69.52 (4)

[0103] The slope of the binary linear equation for volatile matter is calculated to be -10, and its intercept is 18, and the quality index value x for ash is obtained. 挥发分 Its quality index score y 挥发分 The linear equation of two variables is:

[0104] y 挥发分 =-10·x 挥发分 +18 (5)

[0105] The slope of the binary linear equation for fixed carbon was calculated to be 1.92, and its intercept was -160.77, and the quality index value x for ash content was obtained. 固定碳 Its quality index score y 固定碳 The linear equation of two variables is:

[0106] y 固定碳 =1.92·x 固定碳 -160.77 (6)

[0107] The slope of the binary linear equation for sulfur content is calculated to be -7.14, and its intercept is 10, and the quality index value x for ash content is obtained. 硫份 Its quality index score y 硫份 The linear equation of two variables is:

[0108] y 硫份 =-7.14·x 硫份 +10 (7)

[0109] The slope of the quadratic equation for drum strength was calculated to be 0.32, and its intercept was -25.16, and the quality index value x for ash content was obtained. 转鼓强度 Its quality index score y 转鼓强度 The linear equation of two variables is:

[0110] y 转鼓强度 =0.32·x 转鼓强度 -25.16 (8)

[0111] The slope of the quadratic equation for the anti-wear index is calculated to be -1.82, and its intercept is 18.18, and the quality index value x for ash content is obtained. 抗磨指数 Its quality index score y 抗磨指数 The linear equation of two variables is:

[0112] y 抗磨指数 =-1.82·x 抗磨指数 +18.18 (9)

[0113] The slope of the quadratic equation for reactivity was calculated to be -2.31, and its intercept was 80.77, and the quality index value x for ash content was obtained. 反应性 Its quality index score y 反应性 The linear equation of two variables is:

[0114] y 反应性 =-2.31·x 反应性 +80.77 (10)

[0115] The slope of the quadratic equation for the post-reaction strength was calculated to be 1.76, and its intercept was -97.06, and the quality index value x for the ash content was obtained. 反应后强度 Its quality index score y 反应后强度 The linear equation of two variables is:

[0116] y 反应后强度 =1.76·x 反应后强度 -97.06 (11)

[0117] The slope of the binary linear equation for the proportion of particles less than 25 mm was calculated to be -1.75, and its intercept was 21.05, and the quality index value x for ash content was obtained. 小于25mm粒度占比 Its quality index score y 小于25mm粒度占比 The linear equation of two variables is:

[0118] y 小于25mm粒度占比 =-1.75·x 小于25mm粒度占比 +21.05 (12)

[0119] The slope of the binary linear equation for the proportion of particles larger than 40 mm was calculated to be 0.67, and its intercept was -33.33, and the quality index value x for ash content was obtained. 大于40mm粒度占比 Its quality index score y 大于40mm粒度占比 The linear equation of two variables is:

[0120] y 大于40mm粒度占比 =0.67·x 大于40mm粒度占比 -33.33 (13)

[0121] (3) Set the coke grading rules according to the comprehensive scores of coke quality indicators.

[0122] In the above steps, the coke classification rules are as follows:

[0123] (3.1) Coke with a comprehensive quality index score of not less than 95 points shall be rated as excellent;

[0124] (3.2) Coke with a comprehensive quality index score of not less than 85 points and less than 95 points shall be rated as good;

[0125] (3.3) Coke with a comprehensive quality index score of not less than 70 points and less than 85 points shall be rated as fair;

[0126] (3.4) Coke with a comprehensive quality index score of not less than 60 points and less than 70 points will be rated as poor;

[0127] (3.5) Coke with a comprehensive quality index score of less than 60 points will be rated as poor.

[0128] (4) Substitute the actual numerical value of the quality index of each component of the graded coke to be scored into the two-variable linear equation of the above step (2), and then use the slope a and intercept b corresponding to the two-variable linear equation of each component to calculate the actual score corresponding to the quality index of each component of the graded coke to be scored, and obtain the actual comprehensive score of the graded coke to be scored.

[0129] In the above steps, according to the principle that the higher the four indicators of fixed carbon, drum strength, post-reaction strength, and the proportion of particles larger than 40 mm, the better, and the lower the seven indicators of moisture, ash, volatile matter, sulfur, anti-wear index, reactivity, and the proportion of particles smaller than 25 mm, the better, the specific method for obtaining the actual comprehensive score of the graded coke to be graded is as follows:

[0130] (4.1) If the actual values ​​of the quality indicators of moisture, ash, volatile matter, sulfur, anti-wear index, reactivity, and the proportion of particles less than 25 mm are less than or equal to their corresponding lower limits, the actual score corresponding to the quality indicator shall be its weight score;

[0131] (4.2) If the actual values ​​of the quality indicators of fixed carbon, drum strength, post-reaction strength, and the proportion of particles larger than 40 mm are greater than or equal to their corresponding upper limits, the actual score corresponding to the quality indicator shall be its weight score;

[0132] (4.3) If the actual value of the quality index of each component is between its corresponding upper limit and lower limit, substitute it into formulas (3) to (13) to calculate the actual score corresponding to the quality index of each component of the graded coke to be scored;

[0133] (4.4) The actual scores corresponding to the quality indicators of each component of the graded coke to be scored are added together to obtain the actual comprehensive score of the graded coke to be scored.

[0134] (5) According to the coke grading principle of the above step (3), combined with the actual comprehensive score of the coke to be graded, the coke to be graded is further graded and ranked.

[0135] Example

[0136] Taking A coke as an example, it is known that the actual value of the quality index of its moisture content is 4.6%, the actual value of the quality index of its ash content is 12.53%, the actual value of the quality index of its volatile matter is 1.35%, the actual value of the quality index of its fixed carbon is 86.12%, the actual value of the quality index of its sulfur content is 0.73%, the actual value of the quality index of its drum strength is 91.86%, the actual value of the quality index of its anti-wear index is 4.62%, the actual value of its quality index of its reactivity is 28.95%, the actual value of its quality index of its post-reaction strength is 60.84%, the actual value of the quality index of the proportion of its particle size less than 25 mm is 7.35%, and the actual value of the quality index of the proportion of its particle size greater than 40 mm is 63.25%.

[0137] First, it is determined that the actual value of the moisture quality index of coke A, 4.6%, is less than the lower limit of the moisture quality index, 5%. According to the principle that the lower the moisture index, the better, the full weight score is directly obtained, that is, the actual score of the moisture quality index of coke A is 10 points;

[0138] Then, it is determined that the actual values ​​of the quality indicators of the remaining components of coke A except for water are between their corresponding upper and lower limits.

[0139] Substituting the actual value of the ash quality index of 12.53% into formula (4), the actual score of the ash quality index of coke A is calculated to be -4.76*12.53+69.52=9.9 points;

[0140] Substituting the actual value of the quality index of the volatile matter, 1.35%, into formula (5), the actual score of the quality index of the volatile matter of coke A is calculated to be -10*1.35+18=4.5 points;

[0141] Substituting the actual value of the quality index of fixed carbon 86.12% into formula (6), the actual score of the quality index of fixed carbon of coke A is calculated to be 1.92*86.12-160.77=4.8 points;

[0142] Substituting the actual value of the quality index of sulfur content, 0.73%, into formula (7), the actual score of the quality index of sulfur content of coke A is calculated to be -7.14*0.73+10=4.8 points;

[0143] Substituting the actual value of the drum strength quality index of 91.86% into formula (8), the actual score of the drum strength quality index of coke A is calculated to be 0.32*91.86-25.16=4.5 points;

[0144] Substituting the actual value of the quality index of the anti-wear index of 4.62% into formula (9), the actual score of the quality index of the anti-wear index of coke A is calculated to be -1.82*4.62+18.18=9.8 points;

[0145] Substituting the actual value of the quality index of reactivity 28.95% into formula (10), the actual score of the quality index of reactivity of coke A is calculated to be -2.31*28.95+80.77=14 points;

[0146] Substituting the actual value of the quality index of the post-reaction strength of 60.846% into formula (11), the actual score of the quality index of the post-reaction strength of coke A is calculated to be 1.76*60.84-97.06=10.3 points;

[0147] Substituting the actual value of the quality index of the proportion of particles less than 25 mm, 7.35%, into formula (12), the actual score of the quality index of the proportion of particles less than 25 mm of coke A is calculated to be -1.75*7.35+821.05=8.2 points;

[0148] Substituting the actual value of the quality index of the proportion of particles larger than 40 mm (63.25%) into formula (13), the actual score of the quality index of the proportion of particles larger than 40 mm of coke A is calculated to be 0.67*63.25-33.33=8.8 points;

[0149] Then add up the actual scores of the quality indicators of each component of coke A, and get the actual comprehensive score of coke A, which is 10+9.9+4.5+4.8+4.8+4.5+9.8+14+10.3+8.2+8.8=89.5 points, which is greater than 85 points and less than 95 points, so coke A is rated good.

[0150] Beneficial effects of the present invention:

[0151] (1) The present invention facilitates the differentiation of coke for matching and use, thereby enabling the blast furnace to achieve good technical and economic indicators;

[0152] (2) The present invention can guide the purchase of high-quality and cost-effective coke, thereby facilitating cost reduction and efficiency improvement.

[0153] The embodiments described above are merely descriptions of preferred implementation modes of the present invention, and are not intended to limit the concept and scope of the present invention. Without departing from the design concept of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary engineering technicians in the field should fall within the protection scope of the present invention. The technical contents for which protection is sought in the present invention have been fully recorded in the technical requirements.

Claims

1. A method for grading coke according to coke composition, characterized in that The following steps are involved: (1) Based on the historical data of coke composition, the quality index baseline of each component and its corresponding weight score are set; (2) According to the quality index baseline of each component and its corresponding weight score, the upper limit value, lower limit value and corresponding score value of the quality index of each component are set, and then the data group consisting of the upper limit value, lower limit value and corresponding score value of the quality index of each component is used to obtain the two-variable linear equation about the quality index value of each component and its quality index score, and the slope a and intercept b corresponding to the two-variable linear equation about each component are calculated; (3) Setting coke classification rules based on the comprehensive scores of coke quality indicators; (4) Substituting the actual numerical value of the quality index of each component of the graded coke to be scored into the binary linear equation of the above step (2), and then using the slope a and intercept b corresponding to the binary linear equation of each component to calculate the actual score corresponding to the quality index of each component of the graded coke to be scored, and obtaining the actual comprehensive score of the graded coke to be scored; (5) According to the coke grading principle of the above step (3), combined with the actual comprehensive score of the coke to be graded, the coke to be graded is further graded and ranked.

2. A method for grading coke according to coke composition according to claim 1, characterized in that: In the above step (1), a good coke quality index baseline and a poor coke quality index baseline are set based on the best and worst coke quality indexes in the past 20 months, specifically: (1.1) The baseline of good coke quality indicators is moisture: 5%, ash: 12.5%, volatile matter: 1.3%, fixed carbon: 86.2%, sulfur: 0.7%, drum strength: 93.5%, anti-wear index: 4.5%, reactivity: 28.5%, post-reaction strength: 63.5%, particle size less than 25mm: 6.3%, particle size greater than 40mm: 65%; (1.2) The baseline for poor coke quality indicators is as follows: moisture: 15%, ash: 14.6%, volatile matter: 1.8%, fixed carbon: 83.6%, sulfur: 1.4%, drum strength: 78%, anti-wear index: 10%, reactivity: 35%, post-reaction strength: 55%, percentage of particle size less than 25 mm: 12%, percentage of particle size greater than 40 mm: 50%.

3. A method for grading coke according to coke composition according to claim 2, characterized in that: Among the quality indicators of the above-mentioned components, moisture content is calculated by the standard single method of total water, that is, the weight loss is calculated after a certain period of time at a constant temperature; ash content, volatile matter and fixed carbon are obtained by industrial fluorescence detection and analysis, and their sum must be equal to 100%; sulfur content is calculated by the standard single method of total sulfur; drum strength and anti-wear index are cold strength indicators, which are obtained by screening with sieves of different apertures; reactivity and post-reaction strength are hot strength indicators, which are measured at a certain high temperature; the proportion of particle size less than 25mm and the proportion of particle size greater than 40mm are obtained by screening with sieves of different apertures.

4. A method for grading coke according to coke composition according to claim 2, characterized in that: In the above step (1), the weight points corresponding to the quality indicators of each component are set according to the importance of the quality indicators of the above components to the blast furnace, specifically, moisture: 10 points, ash: 10 points, volatile matter: 5 points, fixed carbon: 5 points, sulfur: 5 points, drum strength: 5 points, anti-wear index: 10 points, reactivity: 15 points, post-reaction strength: 15 points, proportion of particle size less than 25 mm: 10 points, proportion of particle size greater than 40 mm: 10 points.

5. A method for grading coke according to coke composition according to claim 4, characterized in that: In the above step (2), according to the principle that the higher the four indicators of fixed carbon, drum strength, post-reaction strength, and the proportion of particles larger than 40 mm, the better, and the lower the seven indicators of moisture, ash, volatile matter, sulfur, anti-wear index, reactivity, and the proportion of particles smaller than 25 mm, the better, the upper and lower limits of the quality indicators of each component and their corresponding scoring values ​​are specifically set as follows: (2.1) The upper limit of the water content quality index is 15%, and its corresponding score is 0 points; the lower limit of the water content quality index is 5%, and its corresponding score is 10 points; (2.2) The upper limit of the ash content quality index is 14.6%, and its corresponding score is 0 points; the lower limit of the ash content quality index is 12.5%, and its corresponding score is 10 points; (2.3) The upper limit of the quality index of volatile matter is 1.8%, and its corresponding score is 0 points; the lower limit of the quality index of volatile matter is 1.3%, and its corresponding score is 5 points; (2.4) The upper limit of the quality index of fixed carbon is 86.2%, and its corresponding score is 5 points; the lower limit of the quality index of fixed carbon is 83.6%, and its corresponding score is 0 points; (2.5) The upper limit of the sulfur content quality index is 1.4%, and its corresponding score is 0 points; the lower limit of the sulfur content quality index is 0.7%, and its corresponding score is 5 points; (2.6) The upper limit of the quality index of drum strength is 93.5%, and its corresponding score is 5 points; the lower limit of the quality index of drum strength is 78%, and its corresponding score is 0 points; (2.7) The upper limit of the quality index of the anti-wear index is 10%, and its corresponding score is 0 points; the lower limit of the quality index of the anti-wear index is 4.5%, and its corresponding score is 10 points; (2.8) The upper limit of the quality index of reactivity is 35%, and its corresponding score is 0 points; the lower limit of the quality index of reactivity is 28.5%, and its corresponding score is 15 points; (2.9) The upper limit of the quality index of post-reaction strength is 63.5%, and its corresponding score is 15 points; the lower limit of the quality index of post-reaction strength is 55%, and its corresponding score is 0 points; (2.10) The upper limit of the quality index for the proportion of particles smaller than 25 mm is 12%, and the corresponding score is 0; the lower limit of the quality index for the proportion of particles smaller than 25 mm is 6.3%, and the corresponding score is 10; (2.11) The upper limit of the quality index for the proportion of particles larger than 40 mm is 65%, and the corresponding score is 10 points; the lower limit of the quality index for the proportion of particles larger than 40 mm is 50%, and the corresponding score is 0 points.

6. A method for grading coke according to coke composition according to claim 5, characterized in that: In the above step (2), the linear equation of two variables is: y=ax+b (1) In the formula, y represents the quality index score of each component; x represents the quality index value of each component, a represents the slope of the quality index of each component, and b represents the intercept of the quality index of each component; Then, taking water as an example, the upper limit value of the water quality index and the corresponding score value, as well as the lower limit value of the water quality index and the corresponding score value are substituted into the binary linear equation to obtain: Then the slope of the binary linear equation about water content is calculated to be -1, and its intercept is 15, and the quality index value x about water content is obtained. 水份 Its quality index score y 水份 The linear equation of two variables is: and 水份 =-x 水份 +15 (3) Similarly: The slope of the quadratic equation about ash content is calculated to be - 4.76, and its intercept is 69.52, and the quality index value x of ash content is obtained 灰分 Its quality index score y 灰分 The linear equation of two variables is: and 灰分 -4.76 x 灰分 +69.52 (4) The slope of the binary linear equation for volatile matter is calculated to be -10, and its intercept is 18, and the quality index value x for ash is obtained. 挥发分 Its quality index score y 挥发分 The linear equation of two variables is: and 挥发分 -10 x 挥发分 +18 (5) The slope of the binary linear equation for fixed carbon was calculated to be 1.92, and its intercept was -160.77, and the quality index value x for ash content was obtained. 固定碳 Its quality index score y 固定碳 The linear equation of two variables is: and 固定碳 =1.92·x 固定碳 -160.77 (6) The slope of the linear equation for sulfur content is calculated to be - 7.14, and its intercept is 10, and the quality index value x of ash content is obtained 硫份 Its quality index score y 硫份 The linear equation of two variables is: and 硫份 -7.14 x 硫份 +10 (7) The slope of the quadratic equation for drum strength was calculated to be 0.32, and its intercept was -25.16, and the quality index value x for ash content was obtained. 转鼓强度 Its quality index score y 转鼓强度 The linear equation of two variables is: and 转鼓强度 =0.32·x 转鼓强度 -25.16 (8) The slope of the quadratic equation for the anti-wear index is calculated to be -1.82, and its intercept is 18.18, and the quality index value x for ash content is obtained. 抗磨指数 Its quality index score y 抗磨指数 The linear equation of two variables is: and 抗磨指数 -1.82 x 抗磨指数 +18.18 (9) The slope of the linear equation for reactivity is calculated to be - 2.31, and its intercept is 80.77, and the quality index value x of ash content is obtained 反应性 Its quality index score y 反应性 The linear equation of two variables is: and 反应性 -2.31 x 反应性 +80.77 (10) The slope of the quadratic equation for the post-reaction strength was calculated to be 1.76, and its intercept was -97.06, and the quality index value x for the ash content was obtained. 反应后强度 Its quality index score y 反应后强度 The linear equation of two variables is: and 反应后强度 =1.76·x 反应后强度 -97.06 (11) The slope of the binary linear equation for the proportion of particles smaller than 25 mm is calculated to be - 1.75, and its intercept is 21.05, and the quality index value x of ash content is obtained 小于25mm粒度占比 Its quality index score y 小于25mm粒度占比 The linear equation of two variables is: and 小于25mm粒度占比 -1.75 x 小于25mm粒度占比 +21.05 (12) The slope of the binary linear equation for the proportion of particles larger than 40 mm was calculated to be 0.67, and its intercept was -33.33, and the quality index value x for ash content was obtained. 大于40mm粒度占比 Its quality index score y 大于40mm粒度占比 The linear equation of two variables is: and 大于40mm粒度占比 =0.67·x 大于40mm粒度占比 -33.33 (13) 7. A method for grading coke according to coke composition according to claim 6, characterized in that: In the above step (3), the coke classification rules are specifically as follows: (3.1) Coke with a comprehensive quality index score of not less than 95 points shall be rated as excellent; (3.2) Coke with a comprehensive quality index score of not less than 85 points and less than 95 points shall be rated as good; (3.3) Coke with a comprehensive quality index score of not less than 70 points and less than 85 points shall be rated as fair; (3.4) Coke with a comprehensive quality index score of not less than 60 points and less than 70 points will be rated as poor; (3.5) Coke with a comprehensive quality index score of less than 60 points will be rated as poor.

8. A method for grading coke according to coke composition according to claim 7, characterized in that: In the above step (4), according to the principle that the higher the four indicators of fixed carbon, drum strength, post-reaction strength, and the proportion of particles larger than 40 mm, the better, and the lower the seven indicators of moisture, ash, volatile matter, sulfur, anti-wear index, reactivity, and the proportion of particles smaller than 25 mm, the better, the specific method for obtaining the actual comprehensive score of the graded coke to be graded is: (4.1) If the actual values ​​of the quality indicators of moisture, ash, volatile matter, sulfur, anti-wear index, reactivity, and the proportion of particles less than 25 mm are less than or equal to their corresponding lower limits, the actual score corresponding to the quality indicator shall be its weight score; (4.2) If the actual values ​​of the quality indicators of fixed carbon, drum strength, post-reaction strength, and the proportion of particles larger than 40 mm are greater than or equal to their corresponding upper limits, the actual score corresponding to the quality indicator shall be its weight score; (4.3) If the actual value of the quality index of each component is between its corresponding upper limit and lower limit, substitute it into formulas (3) to (13) to calculate the actual score corresponding to the quality index of each component of the graded coke to be scored; (4.4) The actual scores corresponding to the quality indicators of each component of the graded coke to be scored are added together to obtain the actual comprehensive score of the graded coke to be scored.

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