A method for evaluating cost performance of mixed coal

Abstract

The invention relates to a mixed coal cost performance evaluation method, which belongs to the field of coking, and comprises the following steps: S1: formulating a coking coal cost performance performance evaluation index and a price evaluation index for different coking coal categories; S2: formulating a proportion score of each coking coal performance evaluation index; S3: formulating a performance evaluation index benchmark value for each coking coal variety; S4: formulating a score addition or deduction condition for each coking coal performance evaluation index; S5: formulating a score weight for the proportion of coal rock components of different coking coals; S6: calculating a performance score according to a performance score formula; S7: calculating the actual coking coal purchase price according to different coking coal secondary focus indicators, the coking coal purchase price and the deduction conditions of a purchase contract; S8: calculating and ranking according to the coking coal cost performance formula, and guiding the purchase of coking coal; S9: ranking the coking coal cost performance, reversely deducing coking coal that does not have a cost performance, formulating under what conditions the coking coal has a cost performance, and guiding the purchase of coking coal.

Description

Technical Field

[0001] The invention belongs to the field of coking and relates to a method for evaluating the cost performance of mixed coal. Background Art

[0002] GB / T 15591-1995, "Method for Distinguishing Commercial Coal Reflectance Distribution Charts," uses commercial coal reflectance distribution charts, standard deviation, and the number of notches to distinguish single-seam coal, simple mixed coal, and complex mixed coal. Single-seam coal has a smaller standard deviation, and the coal rock reflectance distribution chart shows no notches.

[0003] Mixed coking coal (hereinafter referred to as mixed coal) is a mixture of different coking coals in a certain proportion. The greater the difference in reflectivity of the mixed single-variety coking coals, the greater the standard deviation of the mixed coal, the easier it is to distinguish the reflectivity distribution diagram, and the more obvious the notch. Conventional indicators such as ash content, volatile matter, and sulfur content of coking coal have a certain additive nature. Therefore, after different varieties of coking coal are mixed in a certain proportion, the conventional quality indicators of the mixed coal can be calculated based on the quality indicators of the single coal and the mixing ratio. Therefore, coking coal with the same conventional quality indicators may be single coking coal or mixed coal. When used in large-scale production, the quality of single coking coal is stable, and its addition has little effect on the quality of coke; the quality fluctuation of mixed coal is relatively large. Changes in the variety of mixed coking coal and the mixing ratio will cause fluctuations in the quality of mixed coal, which will affect the quality of coke after use in large-scale production. Therefore, although the same conventional detection quality indicators are used, the effects of single coking coal and mixed coal in large-scale production are different.

[0004] Currently, there are numerous methods for evaluating the cost-effectiveness of coking coal, both domestically and internationally. These primarily assess performance using weighted indicators such as ash content, volatile matter, sulfur content, G value, and Y value. The ratio of performance to purchase price is used to determine the cost-effectiveness of coking coal. These methods rank the cost-effectiveness of new coking coal varieties by comparing them with benchmark coking coals. This evaluation method is ineffective for evaluating blended coals and is therefore illogical. Furthermore, during the procurement process for different coking coal blends, the ash content, volatile matter, sulfur content, G value, and Y value of the coking coal are contractually agreed upon. Any deviation from the contracted quality of the coking coal supply will result in additional deductions based on the contract. Therefore, incorporating all of the ash, volatile matter, sulfur content, G value, and Y value of the coking coal into the performance evaluation is illogical and inadequate, preventing a comprehensive evaluation of the blended coal. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a method for evaluating the cost-effectiveness of mixed coal, formulate different cost-effectiveness evaluation schemes for different coking coal varieties, and evaluate the coking coal mixed coal situation through evaluation indicators such as the proportion of coal rock components, standard deviation, and notch.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A method for evaluating the cost performance of mixed coal comprises the following steps:

[0008] S1: Develop performance evaluation indicators and price evaluation indicators for coking coal cost-effectiveness for different categories of coking coal;

[0009] S2: Formulate the percentage score of each coking coal performance evaluation index;

[0010] S3: Establish benchmark values for performance evaluation indicators of various coking coal varieties;

[0011] S4: Formulate the scoring conditions for each coking coal performance evaluation index;

[0012] S5: Establish scoring weights for different proportions of coking coal petrology;

[0013] S6: Calculate the performance score according to the performance score formula;

[0014] S7: Calculate the actual coking coal purchase price based on the coking coal purchase price and the deduction conditions in the purchase contract according to the different coking coal sub-indicators;

[0015] S8: Calculate and sort coking coal according to the cost-performance formula to guide coking coal procurement;

[0016] S9: Sort by cost-effectiveness of coking coal, reversely analyze the coking coal that is not cost-effective, determine under what conditions coking coal is cost-effective, and guide coking coal procurement.

[0017] Furthermore, the overall evaluation indexes of coking coal include: ash content, volatile matter, sulfur content, G value, Y value, coal rock composition, standard deviation, notch, and thermal strength of small coke oven coke of single coal;

[0018] In the overall evaluation index of coking coal, each major category of coking coal has different key indicators; the key indicators corresponding to each major category of coking coal are used as its coking coal cost-effectiveness performance evaluation index, and the remaining indicators are used as its price evaluation index.

[0019] Furthermore, the coking coal categories include mixed coking coal, mixed fat coal, mixed 1 / 3 coking coal, mixed gas coal, and mixed lean coal; among which:

[0020] The key indicators of attention for mixed coking coal are: coal rock composition, standard deviation, notch and thermal strength of small coke oven coke of single coal;

[0021] The key indicators of mixed fertilizer coal are: Y value, coal rock composition, standard deviation, notch, and thermal strength of small coke oven coke;

[0022] The key indicators of interest for mixed 1 / 3 coking coal are: volatile matter, coal rock composition, standard deviation, notch, and thermal strength of single heavy coal coke;

[0023] The key volatility indicators of mixed gas coal are: volatile matter, coal rock composition, standard deviation, notch and thermal strength of single coal coke;

[0024] The key indicators of mixed lean coal are: G value, Y value, coal rock composition, standard deviation, notch and thermal strength of single coal coke.

[0025] Furthermore, in step S2, the percentage score of each coking coal performance evaluation index is formulated according to the different levels of the indicators focused on for different coking coals, specifically including:

[0026] The scores for the performance evaluation indicators of mixed coking coal are as follows: coal rock composition 30 points, standard deviation 20 points, notch 10 points, thermal strength of coke from a single type of coal small coke oven 40 points;

[0027] The scores for the performance evaluation indicators of mixed fertilizer coal are as follows: Y value 20 points, coal rock composition 30 points, standard deviation 10 points, notch 10 points, thermal strength of coke from a single type of coal small coke oven 30 points;

[0028] The scores for the performance evaluation indicators of mixed 1 / 3 coking coal are as follows: volatile matter 10 points, coal rock composition 40 points, standard deviation 10 points, notch 10 points, and thermal strength of single-coal small coke oven coke 30 points;

[0029] The scores for the performance evaluation indexes of mixed gas coal are as follows: volatile matter 20 points, coal rock composition 40 points, standard deviation 10 points, notch 10 points, thermal strength of coke from a single type of coal small coke oven 20 points;

[0030] The scores of the performance evaluation indicators of mixed lean coal are: G value 20 points, Y value 10 points, coal rock composition 30 points, standard deviation 10 points, notch 10 points, and thermal strength of coke in a small coke oven of a single coal type 20 points.

[0031] Furthermore, the step S3 of formulating the benchmark values of the performance evaluation indicators of each coking coal variety specifically includes:

[0032] The benchmark values for the performance evaluation indicators of mixed coking coal are: coal rock composition 100%, standard deviation 0.20, notch 1, and thermal strength of single-coal small coke oven coke 65%;

[0033] The benchmark values for the performance evaluation indicators of mixed fertilizer coal are: Y value 25mm, coal rock composition 100%, standard deviation 0.12, notch 0, and thermal strength of single coal small coke oven coke 65%;

[0034] The benchmark values for the performance evaluation indicators of mixed 1 / 3 coking coal are: volatile matter 34%, coal rock composition 100%, standard deviation 0.12, notch 0, and thermal strength of single-coal small coke oven coke 50%;

[0035] The benchmark values for the performance evaluation of mixed gas coal are: volatile matter 40%, coal rock composition 100%, standard deviation 0.12, notch 0, thermal strength of single coal small coke oven coke 50%;

[0036] The benchmark values for the performance evaluation indicators of mixed lean coal are: G value 40, Y value 8mm, coal rock composition 100%, standard deviation 0.12, notch 0, and thermal strength of single coal small coke oven coke 40%.

[0037] Furthermore, in step S4, the addition and subtraction conditions for each coking coal performance evaluation index are formulated according to the different levels of focus on the indicators of different coking coals. The subtraction conditions for the performance evaluation indicators of various coking coals are as follows: if the standard deviation is higher than the reference value by a threshold value A, a point is deducted; if the number of notches is B more than the reference value, b points are deducted; if the thermal strength of coke from a small coke oven of a single type of coal is lower than the reference value by C, a point is deducted; if the G value is lower than the reference value by D, a point is deducted; if the Y value is lower than the reference value by E, a point is deducted; if the volatile matter is higher than the reference value by F, a point is deducted; specifically:

[0038] Deduction conditions for the performance evaluation index of mixed coking coal: 1 point will be deducted if the standard deviation is 0.02 higher than the benchmark value; 2 points will be deducted if there is one more notch than the benchmark value; 1 point will be deducted if the thermal strength of coke from a small coke oven of a single type of coal is 1% lower than the benchmark value;

[0039] Deduction conditions for the performance evaluation indicators of mixed fertilizer coal: 2 points will be deducted if the Y value is 1mm lower than the benchmark value; 1 point will be deducted if the standard deviation is 0.01 higher than the benchmark value; 2 points will be deducted if there is one more notch than the benchmark value; 1 point will be deducted if the thermal strength of coke from a small coke oven of a single type of coal is 1% lower than the benchmark value;

[0040] Deduction conditions for the performance evaluation index of mixed 1 / 3 coking coal: if the volatile matter is 0.1% higher than the benchmark value, 0.3 points will be deducted; if the standard deviation is 0.01 higher than the benchmark value, 1 point will be deducted; if there is one more notch than the benchmark value, 2 points will be deducted; if the thermal strength of coke from a small coke oven of a single type of coal is 1% lower than the benchmark value, 1 point will be deducted;

[0041] Deduction conditions for the performance evaluation index of mixed gas coal: if the volatile matter is 0.1% higher than the benchmark value, 0.4 points will be deducted; if the standard deviation is 0.01 higher than the benchmark value, 1 point will be deducted; if there is one more notch than the benchmark value, 2 points will be deducted; if the thermal strength of coke from a small coke oven of a single type of coal is 1% lower than the benchmark value, 1 point will be deducted;

[0042] Scoring conditions for the performance evaluation indicators of mixed lean coal: if the G value is 1 lower than the benchmark value, 1 point will be deducted; if the Y value is 1mm lower than the benchmark value, 1 point will be deducted; if the standard deviation is 0.01 higher than the benchmark value, 1 point will be deducted; if there is 1 more notch than the benchmark value, 2 points will be deducted; if the thermal strength of coke from a small coke oven of a single type of coal is 1% lower than the benchmark value, 1 point will be deducted.

[0043] Furthermore, in step S5, the weights of the scores for the petrologic composition ratios of different coking coals are determined according to the different levels of emphasis on the petrologic composition ratios of different coking coals, specifically including:

[0044] The coking coal rock composition includes long flame coal, gas coal, 1 / 3 coking coal, fat coal, coking coal, lean coal and poor lean coal;

[0045] In the mixed coking coal, the score weight of long flame coal proportion is 0, the score weight of gas coal proportion is 0.3, the score weight of 1 / 3 coking coal proportion is 0.5, the score weight of fat coal proportion is 0.7, the score weight of coking coal proportion is 1, the score weight of lean coal proportion is 0.5, and the score weight of lean coal proportion is 0.3;

[0046] In the mixed fat coal, the score weight of long flame coal proportion is 0, the score weight of gas coal proportion is 0.3, the score weight of 1 / 3 coking coal proportion is 0.6, the score weight of fat coal proportion is 1, the score weight of coking coal proportion is 0.7, the score weight of lean coal proportion is 0.3, and the score weight of lean coal proportion is 0;

[0047] In the mixed 1 / 3 coking coal, the score weight of long flame coal proportion is 0, the score weight of gas coal proportion is 0.5, the score weight of 1 / 3 coking coal proportion is 1, the score weight of fat coal proportion is 0.9, the score weight of coking coal proportion is 0.5, the score weight of lean coal proportion is 0.1, and the score weight of lean coal proportion is 0;

[0048] In the mixed gas coal, the score weight of long flame coal is 0.5, the score weight of gas coal is 1, the score weight of 1 / 3 coking coal is 0.9, the score weight of fat coal is 0.8, the score weight of coking coal is 0.5, the score weight of lean coal is 0.1, and the score weight of lean coal is 0;

[0049] In the mixed lean coal, the score weight of long flame coal is 0, the score weight of gas coal is 0.1, the score weight of 1 / 3 coking coal is 0.3, the score weight of fat coal is 0.5, the score weight of coking coal is 1, the score weight of lean coal is 1, and the score weight of poor lean coal is 0.5.

[0050] Furthermore, the step S6 of calculating the performance score according to the performance score formula specifically includes:

[0051] Standard deviation score of blended coke = 20 + (actual standard deviation - standard deviation reference value) / A*(-a)

[0052] Notch score of blended coke = 10 + (actual notch - standard notch) * (-b)

[0053] Thermal strength score of coke from a single-coal coke oven of mixed coking coal = 40 + (actual thermal strength of coke from a single-coal coke oven - thermal strength benchmark value of coke from a single-coal coke oven) / (-C) * (-c)

[0054] Coal petrographic component score of each type of coking coal = (long flame coal proportion * score weight + gas coal proportion * score weight + 1 / 3 coking coal proportion * score weight + fat coal proportion * score weight + coking coal proportion * score weight + lean coal proportion * score weight + lean coal proportion * score weight) / 100 * its coal petrographic component proportion score;

[0055] The total score of each type of coking coal = the standard deviation score of each type of coking coal + the notch score of each type of coking coal + the thermal strength score of the coke in the small coke oven of each type of coking coal + the coal rock component score of each type of coking coal.

[0056] Further, step S7 specifically includes:

[0057] Coking coal ash content plus deduction amount = (actual ash content - contract ash content) / 0.1% * deduction amount

[0058] Coking coal volatile matter plus deduction amount = (actual volatile matter - contract volatile matter) / 0.1% * deduction amount

[0059] Coking coal sulfur content plus deduction amount = (actual sulfur content - contract sulfur content) / 0.01% * deduction amount

[0060] Coking coal G value plus deduction amount = (actual G value - contract G value) / (-1) * deduction amount

[0061] Coking coal Y value plus deduction amount = (actual Y value - contract Y value) / (-1) * deduction amount

[0062] The deduction amount is a negative value.

[0063] Further, in step S8, specifically:

[0064] Cost-effectiveness = index score / price*100.

[0065] The beneficial effects of the present invention are as follows: the present invention combines the coking coal purchase contract indicators, incorporates the secondary concern indicators into the purchase price calculation, and incorporates the key concern indicators into the performance evaluation, so that the coking coal cost performance evaluation is more reasonable and more representative.

[0066] Other advantages, objects, and features of the present invention will be described in part in the following description and, in part, will be apparent to those skilled in the art upon examination of the following description or may be learned from practice of the present invention. The objects and other advantages of the present invention may be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0067] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below with reference to the accompanying drawings, in which:

[0068] Figure 1 This is a flow chart of the cost-effectiveness evaluation method for mixed coal according to the present invention. DETAILED DESCRIPTION

[0069] The following describes the embodiments of the present invention by means of specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0070] Among them, the accompanying drawings are only for illustrative purposes and represent only schematic diagrams rather than actual pictures, and should not be understood as limiting the present invention. In order to better illustrate the embodiments of the present invention, some parts of the accompanying drawings may be omitted, enlarged or reduced, and do not represent the dimensions of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions may be omitted in the accompanying drawings.

[0071] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "back", etc. indicating directions or positional relationships, they are based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0072] A cost-effectiveness evaluation method for mixed coal, such as Figure 1 As shown, the following steps are included:

[0073] 1. Formulate performance evaluation indicators and price evaluation indicators for coking coal cost-effectiveness for different categories of coking coal.

[0074] The evaluation indicators of coking coal are: ash content, volatile matter, sulfur content, G value, Y value, coal rock composition, standard deviation, notch, thermal strength of single coal coke, etc.

[0075] Blended coking coal focuses on coal rock composition, standard deviation, notch and thermal strength of small coke oven coke of single coal;

[0076] For mixed fat coal, focus on Y value, coal rock composition, standard deviation, notch, and thermal strength of small coke oven coke;

[0077] For mixed 1 / 3 coking coal, focus on volatile matter, coal rock composition, standard deviation, notch, and thermal strength of single heavy coal coke;

[0078] For mixed gas coal, the focus is on volatile matter, coal rock composition, standard deviation, notch, and thermal strength of coke of individual coals;

[0079] The focus of mixed lean coal is G value, Y value, coal rock composition, standard deviation, notch and thermal strength of single coal coke.

[0080] Therefore, the key indicators will be the performance indicators of the major varieties of coking coal, and the second focus will be on the detection indicators such as the ash content and sulfur content of coking coal, which will be included in the coking coal surcharge, as shown in Table 1.

[0081] Table 1

[0082]

[0083] 2. According to the different levels of focus on different coking coal indicators, the proportion scores of each coking coal performance evaluation indicator are formulated, as shown in Table 2.

[0084] Table 2

[0085]

[0086] 3. Establish benchmark values for performance evaluation indicators for each coking coal variety, as shown in Table 3.

[0087] Table 3

[0088]

[0089] 4. Based on the different levels of focus on different coking coal indicators, the conditions for adding and deducting points for each coking coal performance evaluation indicator (except for the proportion of coal rock components) are formulated, as shown in Table 4.

[0090] Table 4

[0091]

[0092] 1) For volatile matter of 1 / 3 coking coal and gas coal, only points will be deducted, no points will be added.

[0093] 2)↑ indicates increase,↓ indicates decrease, increase is positive, decrease is negative.

[0094] 3) Deductions are expressed as negative values.

[0095] 5. The scoring weights of the petrological composition ratios of different coking coals are formulated according to the different levels of focus on the petrological composition ratios of different coking coals, as shown in Table 5.

[0096] Table 5

[0097]

[0098]

[0099] Coal rock composition classification is divided according to the standards in Table 6:

[0100] Table 6

[0101]

[0102] 6. Calculate the coking coal performance score.

[0103] Blended coking coal standard deviation score = 20 + (actual standard deviation - 0.12) / 0.02 * (-1)

[0104] Mixed coke notch score = 10 + (actual notch - standard notch) * (-2)

[0105] Thermal strength score of coke from mixed coking coal = 40 + (actual thermal strength of coke from single coal - 65) / (-1) * (-1)

[0106] Mixed coking coal rock component score = (long flame coal proportion*0+gas coal proportion*0.3+1 / 3 proportion*0.5+fat coal proportion*0.7+coking coal proportion*1+lean coal proportion*0.5+poor lean coal proportion*0.3) / 100*30

[0107] Total score of mixed coking coal = mixed coking coal standard deviation score + mixed coking coal notch score + mixed coking coal single coal coke thermal strength score + mixed coking coal coal rock component score

[0108] Similarly, the scores of mixed fat coal, mixed 1 / 3 coking coal, mixed gas coal, and mixed lean coal coking coal can be calculated.

[0109] 7. Calculate the actual coking coal purchase price based on the different key indicators of coking coal and the coking coal purchase price and deduction conditions in the purchase contract.

[0110] Coking coal ash content plus deduction amount = (actual ash content - contract ash content) / 0.1% * deduction amount

[0111] Coking coal volatile matter plus deduction amount = (actual volatile matter - contract volatile matter) / 0.1% * deduction amount

[0112] Coking coal sulfur content plus deduction amount = (actual sulfur content - contract sulfur content) / 0.01% * deduction amount

[0113] Coking coal G value plus deduction amount = (actual G value - contract G value) / (-1) * deduction amount

[0114] Coking coal Y value plus deduction amount = (actual Y value - contract Y value) / (-1) * deduction amount

[0115] The deduction is a negative value and the price is a positive value.

[0116] 8. Calculate and rank according to the cost-performance formula of coking coal to guide the purchase of coking coal.

[0117] Cost-effectiveness = index score / price * 100

[0118] 9. Rank the coking coals according to their cost-effectiveness, reverse-analyze the coking coals that are not cost-effective, determine under what conditions coking coal is cost-effective, and guide the procurement of coking coal.

[0119] Example 1

[0120] Assume that a coking coal A is found with a contract price of RMB 2,200 / ton and contract indicators: ash content ≤10.0%, sulfur content ≤1.20%, volatile matter 20% to 24%, G value ≥80, Y value ≥15mm, standard deviation ≤0.20, and CSR ≥64%.

[0121] The quality inspection results of the mailed coal sample A are as follows: ash content 10.68%, volatile matter 20.78%, sulfur content 1.35%, G value 74, Y value 12, standard deviation 0.185, notch 2, fat coal proportion 13.06%, coking coal proportion 64.62%, lean coal proportion 22.32%, CSR 73.5%.

[0122] A coking coal B coal, contract price is 2,400 yuan / ton, contract indicators: ash content ≤10.0%, sulfur content ≤1.20%, volatile matter 20%~24%, G value ≥80, Y value ≥15mm, standard deviation ≤0.20, CSR ≥64%.

[0123] The quality inspection results of the mailed B coal sample are as follows: ash content 10.30%, volatile matter 22.81%, sulfur content 1.30%, G value 78, Y value 13.5, standard deviation 0.166, notch 1, fat coal proportion 18.12%, coking coal proportion 71.25%, lean coal proportion 10.63%, CSR 77.1%.

[0124] Contract deductions for coal A and coal B: 5 yuan / ton for ash content ↑0.1%; 3 yuan / ton for sulfur content ↑0.01%; no deductions are made within the contract scope for volatile matter; 1 yuan / ton for volatile matter exceeding the upper limit by ↑0.1% or falling below the lower limit by ↓0.1%; 10 yuan / ton for G value ↓1; 10 yuan / ton for Y value ↓1mm.

[0125] 1. If coal A is mixed coking coal, the score will be calculated according to the cost performance evaluation method of mixed coking coal. The score is as follows:

[0126] Coal A standard deviation score = 20 + (0.185-0.20) / 0.02*(-1) = 20.75

[0127] Coal A notch score = 10 + (2-1) * (-2) = 8

[0128] Coal A petrologic composition score = (13.06*0.7+64.62*1+22.32*0.5) / 100*30 = 25.48

[0129] Coal A's CSR score = 40 + (73.5 - 65) / (-1) * (-1) = 48.5

[0130] Actual score of coal A = 20.75 + 8 + 25.48 + 48.5 = 102.73

[0131] 2. The amount of deduction for A coal index is calculated based on the terms of the contract.

[0132] Ash content ↑0.1%, deduction of 5 yuan / ton, then the ash content of coal A plus deduction = (10.68-10.0) / 0.1*(-5) = -34 yuan / ton

[0133] No deduction will be made within the contract scope for volatile matter. The actual value of volatile matter in coal A is 20.78%, and the contract value is 20% to 24%, so no deduction will be made for volatile matter.

[0134] If the sulfur content is ↑0.01%, 3 yuan / ton will be deducted. Then the sulfur content of coal A plus deduction = (1.35-1.2) / 0.1*(-3) = -45 yuan / ton

[0135] G value↓1, deduct 10 yuan / ton, then the G value of coal A plus deduction = (74-80) / (-1)*(-10) = -60 yuan / ton

[0136] If the Y value is ↓1mm, 10 yuan / ton will be deducted. Then the Y value of coal A plus the deduction = (12-15) / (-1)*(-10) = -30 yuan / ton

[0137] Amount of coal quota plus deduction = (-34) + 0 + (-45) + (-60) + (-30) = -169

[0138] The actual price of coal A = 2200 + (-169) = 2031 yuan

[0139] The cost performance of coal A = 102.73 / 2031*100 = 5.06

[0140] Similarly, the B coal index score can be calculated as 110.57

[0141] B coal index plus deduction -80

[0142] The actual purchase price of coal B = 2400 + (-80) = 2320

[0143] The cost performance of coal B = 110.57 / 2320*100 = 4.77

[0144] Since the price / performance ratio of coal A (5.06) is greater than that of coal B (4.77), it means that coal A has a higher price / performance ratio, so it is recommended to purchase coal A.

[0145] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions, which should all be included in the scope of the claims of the present invention.

Claims

1. A method for evaluating the cost performance of mixed coal, characterized by: The following steps are involved: S1: Develop performance evaluation indicators and price evaluation indicators for coking coal cost-effectiveness for different categories of coking coal; S2: Formulate the percentage score of each coking coal performance evaluation index; S3: Establish benchmark values for performance evaluation indicators of various coking coal varieties; S4: Formulate the scoring conditions for each coking coal performance evaluation index; In step S4, the addition and subtraction conditions of each coking coal performance evaluation index are formulated according to the different levels of focus on the indicators of different coking coals. The subtraction conditions of the performance evaluation indicators of various coking coals are as follows: if the standard deviation is higher than the reference value by a threshold value A, a point is deducted; if the number of notches is B more than the reference value, b points are deducted; if the thermal strength of coke from a small coke oven of a single type of coal is lower than the reference value by C, a point is deducted; if the G value is lower than the reference value by D, a point is deducted; if the Y value is lower than the reference value by E, a point is deducted; if the volatile matter is higher than the reference value by F, a point is deducted; S5: Establish scoring weights for different proportions of coking coal petrology; In step S5, the weights of the scores for the petrological composition ratios of different coking coals are determined according to the different levels of emphasis on the petrological composition ratios of different coking coals, specifically including: The coking coal rock composition includes long flame coal, gas coal, 1 / 3 coking coal, fat coal, coking coal, lean coal and poor lean coal; In the mixed coking coal, the score weight of long flame coal proportion is 0, the score weight of gas coal proportion is 0.3, the score weight of 1 / 3 coking coal proportion is 0.5, the score weight of fat coal proportion is 0.7, the score weight of coking coal proportion is 1, the score weight of lean coal proportion is 0.5, and the score weight of lean coal proportion is 0.3; In the mixed fat coal, the score weight of long flame coal proportion is 0, the score weight of gas coal proportion is 0.3, the score weight of 1 / 3 coking coal proportion is 0.6, the score weight of fat coal proportion is 1, the score weight of coking coal proportion is 0.7, the score weight of lean coal proportion is 0.3, and the score weight of lean coal proportion is 0; In the mixed 1 / 3 coking coal, the score weight of long flame coal proportion is 0, the score weight of gas coal proportion is 0.5, the score weight of 1 / 3 coking coal proportion is 1, the score weight of fat coal proportion is 0.9, the score weight of coking coal proportion is 0.5, the score weight of lean coal proportion is 0.1, and the score weight of lean coal proportion is 0; In the mixed gas coal, the score weight of long flame coal is 0.5, the score weight of gas coal is 1, the score weight of 1 / 3 coking coal is 0.9, the score weight of fat coal is 0.8, the score weight of coking coal is 0.5, the score weight of lean coal is 0.1, and the score weight of lean coal is 0; In the lean coal mixture, the score weight of long flame coal proportion is 0, the score weight of gas coal proportion is 0.1, the score weight of 1 / 3 coking coal proportion is 0.3, the score weight of fat coal proportion is 0.5, the score weight of coking coal proportion is 1, the score weight of lean coal proportion is 1, and the score weight of lean coal proportion is 0.5; S6: Calculating the performance score according to the performance score formula; Step S6 specifically includes: Standard deviation score of blended coking coal = 20 + (actual standard deviation - standard deviation benchmark value) / A* (-a) Notch score of blended coking coal = 10 + (actual notch - standard notch) * (-b) Thermal strength score of coke from a single type of coal in a small coke oven of mixed coking coal = 40 + (actual thermal strength of coke from a single type of coal in a small coke oven - benchmark thermal strength of coke from a single type of coal in a small coke oven) / (-C) * (-c) Coal petrographic component score of each type of coking coal = (long flame coal proportion * score weight + gas coal proportion * score weight + 1 / 3 coking coal proportion * score weight + fat coal proportion * score weight + coking coal proportion * score weight + lean coal proportion * score weight + lean coal proportion * score weight) / 100 * its coal petrographic component proportion score; The total score of each type of coking coal = the standard deviation score of each type of coking coal + the notch score of each type of coking coal + the thermal strength score of the small coke oven coke of each type of coking coal + the coal petrographic component score of each type of coking coal; S7: Calculate the actual coking coal purchase price based on the different coking coal sub-key indicators, the coking coal purchase price, and the deduction conditions in the purchase contract. Step S7 specifically includes: Coking coal ash content plus deduction amount = (actual ash content - contract ash content) / 0.1% * deduction amount Coking coal volatile matter plus deduction amount = (actual volatile matter - contract volatile matter) / 0.1% * deduction amount Coking coal sulfur content plus deduction amount = (actual sulfur content - contract sulfur content) / 0.01% * deduction amount Coking coal G value plus deduction amount = (actual G value - contract G value) / (-1) * deduction amount Coking coal Y value plus deduction amount = (actual Y value - contract Y value) / (-1) * deduction amount The deduction amount is a negative value; S8: Calculate and sort coking coal according to the cost-performance formula to guide coking coal procurement, specifically: Cost-effectiveness = index score / price * 100 S9: Sort by cost-effectiveness of coking coal, reversely analyze the coking coal that is not cost-effective, determine under what conditions coking coal is cost-effective, and guide coking coal procurement.

2. The method for evaluating the cost performance of mixed coal according to claim 1, wherein: The overall evaluation indexes of coking coal include: ash content, volatile matter, sulfur content, G value, Y value, coal rock composition, standard deviation, notch, thermal strength of coke from small coke ovens of single coal; In the overall evaluation index of coking coal, each major category of coking coal has different key indicators; the key indicators corresponding to each major category of coking coal are used as its coking coal cost-effectiveness performance evaluation index, and the remaining indicators are used as its price evaluation index.

3. The method for evaluating the cost performance of mixed coal according to claim 1, wherein: The coking coal categories include mixed coking coal, mixed fat coal, mixed 1 / 3 coking coal, mixed gas coal, and mixed lean coal; among them: The key indicators of attention for mixed coking coal are: coal rock composition, standard deviation, notch and thermal strength of small coke oven coke of single coal; The key indicators of mixed fertilizer coal are: Y value, coal rock composition, standard deviation, notch, and thermal strength of small coke oven coke; The key indicators of interest for mixed 1 / 3 coking coal are: volatile matter, coal rock composition, standard deviation, notch, and thermal strength of single heavy coal coke; The key volatility indicators of mixed gas coal are: volatile matter, coal rock composition, standard deviation, notch and thermal strength of single coal coke; The key indicators of mixed lean coal are: G value, Y value, coal rock composition, standard deviation, notch and thermal strength of single coal coke.

4. The method for evaluating the cost performance of mixed coal according to claim 1, wherein: In step S2, based on the different levels of the indicators that are of particular concern to different coking coals, a score is formulated for each coking coal performance evaluation indicator, specifically including: The scores for the performance evaluation indicators of mixed coking coal are as follows: coal rock composition 30 points, standard deviation 20 points, notch 10 points, thermal strength of coke from a single type of coal small coke oven 40 points; The scores for the performance evaluation indicators of mixed fertilizer coal are as follows: Y value 20 points, coal rock composition 30 points, standard deviation 10 points, notch 10 points, thermal strength of coke from a single type of coal small coke oven 30 points; The scores for the performance evaluation indicators of mixed 1 / 3 coking coal are as follows: volatile matter 10 points, coal rock composition 40 points, standard deviation 10 points, notch 10 points, and thermal strength of single-coal small coke oven coke 30 points; The scores for the performance evaluation indexes of mixed gas coal are as follows: volatile matter 20 points, coal rock composition 40 points, standard deviation 10 points, notch 10 points, thermal strength of coke from a single type of coal small coke oven 20 points; The scores of the performance evaluation indicators of mixed lean coal are: G value 20 points, Y value 10 points, coal rock composition 30 points, standard deviation 10 points, notch 10 points, and thermal strength of coke in a small coke oven of a single coal type 20 points.

5. The method for evaluating the cost performance of mixed coal according to claim 1, wherein: Step S3 of formulating the performance evaluation index benchmark values for each coking coal variety specifically includes: The benchmark values for the performance evaluation indicators of mixed coking coal are: coal rock composition 100%, standard deviation 0.20, notch 1, and thermal strength of single-coal small coke oven coke 65%; The benchmark values for the performance evaluation indicators of mixed fat coal are: Y value 25mm, coal rock composition 100%, standard deviation 0.12, notch 0, thermal strength of single coal small coke oven coke 65%; The benchmark values for the performance evaluation indicators of mixed 1 / 3 coking coal are: volatile matter 34%, coal rock composition 100%, standard deviation 0.12, notch 0, and thermal strength of single-coal small coke oven coke 50%; The benchmark values for the performance evaluation of mixed gas coal are: volatile matter 40%, coal rock composition 100%, standard deviation 0.12, notch 0, thermal strength of single coal small coke oven coke 50%; The benchmark values for the performance evaluation indicators of mixed lean coal are: G value 40, Y value 8mm, coal rock composition 100%, standard deviation 0.12, notch 0, and thermal strength of single coal small coke oven coke 40%.

6. The method for evaluating the cost performance of mixed coal according to claim 1, wherein: Step S4 is specifically as follows: Deduction conditions for the performance evaluation index of mixed coking coal: if the standard deviation is 0.02 higher than the benchmark value, 1 point will be deducted; if there is one more notch than the benchmark value, 2 points will be deducted; if the thermal strength of coke from a small coke oven of a single type of coal is 1% lower than the benchmark value, 1 point will be deducted; Deduction conditions for performance evaluation indicators of mixed fertilizer coal: 2 points will be deducted if the Y value is 1mm lower than the benchmark value; If the standard deviation is 0.01 higher than the benchmark value, 1 point will be deducted; if there is one more notch than the benchmark value, 2 points will be deducted; if the thermal strength of coke from a small coke oven with a single type of coal is 1% lower than the benchmark value, 1 point will be deducted; Deduction conditions for the performance evaluation index of mixed 1 / 3 coking coal: if the volatile matter is 0.1% higher than the benchmark value, 0.3 points will be deducted; if the standard deviation is 0.01 higher than the benchmark value, 1 point will be deducted; if there is one more notch than the benchmark value, 2 points will be deducted; If the thermal strength of coke from a small coke oven with a single type of coal is 1% lower than the benchmark value, 1 point will be deducted; The deduction conditions for the performance evaluation index of mixed gas coal are as follows: if the volatile matter is 0.1% higher than the reference value, 0.4 points will be deducted; if the standard deviation is 0.01 higher than the reference value, 1 point will be deducted; if there is one more notch than the reference value, 2 points will be deducted; If the thermal strength of coke from a small coke oven with a single type of coal is 1% lower than the benchmark value, 1 point will be deducted; The deduction conditions for the performance evaluation index of mixed lean coal are as follows: if the G value is 1 lower than the benchmark value, 1 point will be deducted; if the Y value is 1mm lower than the benchmark value, 1 point will be deducted; If the standard deviation is 0.01 higher than the benchmark value, 1 point will be deducted; if there is one more notch than the benchmark value, 2 points will be deducted; if the thermal strength of coke from a small coke oven of a single type of coal is 1% lower than the benchmark value, 1 point will be deducted.

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