A method for analyzing a coal injection and blending structure of a blast furnace

Abstract

The present application relates to a kind of blast furnace coal injection coal blending structure analysis method, belong to blast furnace coal injection field, comprising the following steps: S1: obtaining the variety of coal injection, and corresponding unit price, quality component;S2: obtaining reference coal blending structure and optimized coal blending structure, obtain the cost of mixed coal powder before and after coal blending structure optimization, each quality analysis index and actual paid cost added value;S3: analyze the cost performance of mixed coal powder before and after coal blending structure optimization;S4: obtain the cost correction value after coal blending structure optimization, ensure the cost performance of mixed coal powder before and after coal blending structure optimization is consistent, and obtain the cost added value needed to pay by this;S5: obtain the difference between actual paid cost added value and cost added value needed to pay, analyze the pros and cons of the optimized coal injection coal blending structure.

Description

Technical Field

[0001] This invention belongs to the field of blast furnace pulverized coal injection and relates to a method for analyzing the coal blending structure of blast furnace pulverized coal injection. Background Technology

[0002] The coal blending structure of blast furnace pulverized coal injection has a significant impact on the quality and fuel cost of the mixed pulverized coal. With the prices of various types of pulverized coal remaining constant, adjustments to the blending structure will change the quality and cost of the mixed pulverized coal, directly affecting its cost-effectiveness. Therefore, calculating and adjusting the cost-effectiveness of the mixed pulverized coal, and analyzing the advantages and disadvantages of different pulverized coal blending structures, provides positive guidance for expanding pulverized coal resources, stabilizing quality, and achieving energy conservation and cost reduction. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide a method for analyzing the coal blending structure of blast furnace pulverized coal injection.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A method for analyzing the coal blending structure of blast furnace pulverized coal injection includes the following steps:

[0006] S1: Obtain the type of coal used for pulverized coal injection, as well as its corresponding unit price and quality composition;

[0007] S2: Obtain the baseline coal blending structure and the optimized coal blending structure, and obtain the mixed coal powder cost, various quality analysis indicators and the actual cost increase before and after the coal blending structure optimization;

[0008] S3: Analyze the cost-effectiveness of mixed pulverized coal before and after coal blending structure optimization;

[0009] S4: Obtain the cost correction value after coal blending structure optimization to ensure that the cost-effectiveness value of mixed coal powder is consistent before and after coal blending structure optimization, and obtain the cost increase value that needs to be paid accordingly.

[0010] S5: Obtain the difference between the actual cost increase and the required cost increase, and analyze the advantages and disadvantages of the optimized pulverized coal blending structure.

[0011] Furthermore, the mass components mentioned in step S1 include ash Ad, sulfur Std, volatile matter Vdaf, moisture Mad, fixed carbon FCd, calorific value Q, and grindability index H.

[0012] Furthermore, for each type of pulverized coal A, B, C, D…, their baseline proportions are R… A R B R C R D …, the optimized proportions are R A ′、R B ′、RC ′、R D …, the unit price of each type of coal is M respectively A M B M C M D …Then the quality analysis indicators Ad1, Vdaf1, Std1, Q1, Mad1, H1, FCd1 and cost M1 before coal blending structure optimization are calculated as follows:

[0013] Ad1 = Ad A *R A +Ad B *R B +Ad C *R C +Ad D *R D +…

[0014] Vdaf1=Vdaf A *R A +Vdaf B *R B +Vdaf C *R C +Vdaf D *R D +…

[0015] Std1 = Std A *R A +Std B *R B +Std C *R C +Std D *R D +…

[0016] Q1 = Q A *R A +Q B *R B +Q C *R C +Q D *R D +…

[0017] Mad1 = Mad A *R A +Mad B *R B +Mad C *R C +Mad D *R D +…

[0018] H1 = H A *RA +H B *R B +H C *R C +H D *R D +…

[0019] FCd1=FCd A *R A +FCd B *R B +FCd C *R C +FCd D *R D +…

[0020] M1 = M A *R A +M B *R B +M C *R C +M D *R D +…

[0021] The following are the calculations of various quality analysis indicators Ad2, Vdaf2, Std2, Q2, Mad2, H2, FCd2, and cost M2 before coal blending structure optimization:

[0022] Ad2 = Ad A *R A ′+Ad B *R B ′+Ad C *R C ′+Ad D *R D ′+…

[0023] Vdaf2=Vdaf A *R A ′+Vdaf B *R B ′+Vdaf C *R C ′+Vdaf D *R D ′+…

[0024] Std2=Std A *R A ′+Std B *R B ′+Std C *R C ′+Std D *R D ′+…

[0025] Q2 = Q A *R A ′+Q B *R B ′+Q C *R C ′+Q D *R D ′+…

[0026] Mad2 = Mad A *R A ′+Mad B *R B ′+Mad C *R C ′+Mad D *R D ′+…

[0027] H2=H A *R A ′+H B *R B ′+H C *R C ′+H D *R D ′+…

[0028] FCd2=FCd A *R A ′+FCd B *R B ′+FCd C *R C ′+FCd D *R D ′+…

[0029] M2 = M A *R A ′+M B *R B ′+M C *R C ′+M D *R D ′+….

[0030] Furthermore, in step S2, the actual cost increase δ incurred for coal blending satisfies the formula:

[0031] δ=M2-M1

[0032] If δ = 0, that is, after the optimization of the pulverized coal injection and blending structure, the actual cost of mixed pulverized coal remains unchanged;

[0033] If δ>0, it means that the actual cost of mixed pulverized coal increases after the optimization of the pulverized coal blending structure.

[0034] If δ < 0, it means that the actual cost of mixed pulverized coal is reduced after the optimization of the pulverized coal blending structure.

[0035] Furthermore, in step S3, a cost-effectiveness model is used to calculate the cost-effectiveness of the mixed pulverized coal quality indicators.

[0036] The quality scores g1, g2, g3, g4, g5, g6, and g7 of various quality indicators of the mixed pulverized coal (Ad1, Vdaf1, Std1, Q1, Mad1, H1, FCd1, and Ad2, Vdaf2, Std2, Q2, Mad2, H2, FCd2, and FCd2, respectively, and the quality scores g1′, g2′, g3′, g4′, g5′, g6′, and g7′ of Ad2, Vdaf2, Std2, Q2, Mad2, H2, and FCd2, respectively, were obtained. The comprehensive quality scores of the mixed pulverized coal (G1 and G2) were then calculated, satisfying the formula:

[0037] G1 = g1 + g2 + g3 + g4 + g5 + g6 + g7

[0038] G2=g1′+g2′+g3′+g4′+g5′+g6′+g7′

[0039] Then calculate the total change in the mass score of the mixed pulverized coal, ΔG = G2 - G1;

[0040] If ΔG = 0, it indicates that the quality of the mixed pulverized coal remains unchanged after structural optimization.

[0041] If ΔG > 0, it indicates that the quality of the mixed pulverized coal has improved after structural optimization;

[0042] If ΔG < 0, it indicates that the quality of the mixed pulverized coal deteriorates after structural optimization.

[0043] The cost-effectiveness values ​​η1 and η2 of the mixed pulverized coal before and after the optimization of the pulverized coal blending structure were calculated using a cost-effectiveness model, satisfying the formula:

[0044] η1 = G1 / M1, η2 = G2 / M2

[0045] The cost-effectiveness change of mixed pulverized coal is Δη = η2 - η1. If Δη = 0, it indicates that after the optimization of the pulverized coal blending structure, the quality of mixed pulverized coal and the cost increase or decrease are synchronized, and the cost-effectiveness of mixed pulverized coal remains unchanged in the end.

[0046] If Δη>0, it indicates that the cost-effectiveness of the mixed pulverized coal has improved after the optimization of the pulverized coal blending structure, and the optimization effect of the pulverized coal blending structure is good.

[0047] If Δη < 0, it indicates that the cost-effectiveness of the mixed pulverized coal is reduced after the optimization of the pulverized coal blending structure, and the optimization effect of the pulverized coal blending structure is not good.

[0048] Furthermore, in step S4, using the cost-effectiveness analysis model, under the condition that other factors remain unchanged, the corrected cost M2′ of the mixed pulverized coal and the cost-effectiveness correction value η2′ are obtained by adjusting the cost M2 of the mixed pulverized coal, satisfying the following relationship:

[0049] η2′=η1

[0050] Therefore, it can be concluded that the cost increase required to compensate for the change in the quality of the mixed pulverized coal after optimizing the pulverized coal blending structure is δ′, which satisfies the formula:

[0051] δ′=M2′-M1.

[0052] Furthermore, in step S5, after optimizing the coal blending structure, the difference Φ between the actual cost increase δ of the mixed pulverized coal and the required cost increase δ′ is the true increase in coal blending cost after optimizing the coal blending structure, satisfying the formula:

[0053] Φ=δ-δ′

[0054] If Φ = 0, it indicates that after the adjustment of the pulverized coal blending structure, the actual cost of the mixed pulverized coal is equal to the cost required, and the economic benefit is 0. The purpose of adjusting the coal blending scheme is to implement it according to production needs.

[0055] If Φ < 0, it indicates that after the adjustment of the pulverized coal blending structure, the actual cost of the mixed pulverized coal is lower than the required cost, and the cost is reduced by -Φ yuan / ton. Therefore, the coal blending scheme is worth implementing.

[0056] If Φ > 0, it indicates that after adjusting the pulverized coal blending structure, the actual cost of the mixed pulverized coal is higher than the required cost, with a cost increase of Φ yuan / ton. Therefore, it is not recommended to adopt this approach or further optimization is needed.

[0057] The beneficial effects of this invention are as follows: This invention provides technical support for optimizing the coal injection and blending structure, can effectively reduce the cost of coal injection and blending, and effectively guide raw material procurement.

[0058] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0059] To make the objectives, technical solutions, and advantages of the present invention clearer, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein:

[0060] Figure 1 This is a flowchart of the method for analyzing the coal blending structure of blast furnace pulverized coal injection. Detailed Implementation

[0061] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can be modified or changed 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 representations of the basic concept of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0062] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the invention. To better illustrate the embodiments of the invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0063] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship 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 orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0064] Please see Figure 1 This invention provides a method for analyzing the coal blending structure of blast furnace pulverized coal injection, comprising the following steps:

[0065] Step 1. Obtain the type of coal for pulverized coal injection, including 1 # Anthracite, 2 # Anthracite, 1 # Bituminous coal, 2 # Table 1 shows the quality indicators of bituminous coal and dust collector ash, as well as various varieties.

[0066] Table 1

[0067]

[0068] Step 2. Obtain the benchmark blending ratio and optimized blending ratio of pulverized coal, as well as the unit price of each type, as shown in Table 2.

[0069] Table 2

[0070]

[0071] Step 3. Through calculation, obtain the various quality indicators of the mixed pulverized coal before and after the pulverized coal injection structure optimization: Ad1, Vdaf1, Std1, Q1, Mad1, H1, FCd1 and Ad2, Vdaf2, Std2, Q2, Mad2, H2, FCd2, and costs M1 and M2, as follows:

[0072] Standard proportions:

[0073] Ad1(%)=8.61*28%+6.33*20%+11.53*47%+12.54*10%+14.66*5%=9.93

[0074] Vdaf1(%)=32.28*28%+33.48*20%+9.78*47%+6.98*10%+3.42*5%=20.22

[0075] Std1(%)=0.49*28%+0.39*20%+0.65*47%+0.62*10%+1.35*5%=0.58

[0076] Q1(mJ / kg)=29.32*28%+30.47*20%+31.23*47%+31*10%+31*5%=30.51

[0077] Mad1(%)=14.75*28%+17.62*20%+11.52*47%+9.60*10%+13.50*5%=13.55

[0078] H1=67*28%+53*20%+69*47%+100*10%+20*5%=65.85

[0079] FCd1(%)=61.76*28%+62.32*20%+79.81*47%+81.5*10%+83*5%=71.59

[0080] M1 (yuan / ton) = 800 * 28% + 900 * 20% + 1000 * 37% + 1050 * 10% + 500 * 5% = 904

[0081] Optimize the ratio:

[0082] Ad2(%)=8.61*22%+6.33*16%+11.53*47%+12.54*10%+14.66*5%=10.31

[0083] Vdaf2(%)=32.28*22%+33.48*16%+9.78*47%+6.98*10%+3.42*5%=17.92

[0084] Std2(%)=0.49*22%+0.39*16%+0.65*47%+0.62*10%+1.35*5%=0.61

[0085] Q2(mJ / kg)=29.32*22%+30.47*16%+31.23*47%+31*10%+31*5%=30.65

[0086] Mad2(%)=14.75*22%+17.62*16%+11.52*47%+9.60*10%+13.50*5%=13.11

[0087] H2=67*22%+53*16%+69*47%+100*10%+20*5%=66.59

[0088] FCd2(%)=61.76*22%+62.32*16%+79.81*47%+81.5*10%+83*5%=73.37

[0089] M2 (yuan / ton) = 800 * 22% + 900 * 16% + 1000 * 47% + 1050 * 10% + 500 * 5% = 920

[0090] Step 4. Based on the calculations and comparisons, calculate the change in coal blending cost after optimizing the proportions.

[0091] δ = M2 - M1 = 920 - 904 = 16 yuan / ton

[0092] Since δ>0, the actual cost of blended coal powder increases by 16 yuan / ton after optimizing the coal blending structure.

[0093] Step 5. Use a cost-performance model to calculate the cost-performance ratio of the mixed pulverized coal quality indicators.

[0094] The scores for each quality indicator are obtained, namely:

[0095] Standard proportions:

[0096] Ad1(9.93):16.52, Vdaf1(20.22):8.87, Std1(0.58):9.26

[0097] Q1(30.51): 23.01, Mad1(13.55): 9.78, H1(65.85): 11.17

[0098] FCd1(71.59): 20.21

[0099] G1=16.52+8.87+9.26+23.01+9.78+11.17+20.21=98.82

[0100] Optimize the ratio:

[0101] Ad2(10.31): 15.83, Vdaf2(17.92): 10.25, Std2(0.61): 9.18

[0102] Q2(30.65):23.18, Mad2(13.11):9.96, H2(66.59):11.32

[0103] FCd2(73.37): 21.02

[0104] G2=15.83+10.25+9.18+23.18+9.96+11.32+21.02=100.73

[0105] Step 6. Based on the calculation and comparison, the total change in the mass score of the mixed pulverized coal, ΔG, satisfies the formula:

[0106] ΔG=G2-G1=100.73-98.82=1.91,

[0107] Since ΔG > 0, it indicates that the quality of the mixed pulverized coal has been improved after the optimized ratio.

[0108] Step 7. Using a cost-performance model, the cost-performance values ​​η1 and η2 of the mixed pulverized coal before and after the optimization of the pulverized coal blending structure are calculated, satisfying the formula:

[0109] η1=G1 / M1=98.82 / 904*100=10.9317

[0110] η2=G2 / M2=100.73 / 920*100=10.9489

[0111] Step 8. Based on the calculations and comparisons, the change in the cost-effectiveness of the mixed pulverized coal, Δη, is obtained, satisfying the formula:

[0112] Δη=η2-η1=0.0172

[0113] Since Δη>0, it indicates that after the optimization of the pulverized coal blending structure, although the cost of blended pulverized coal increases, the quality of blended pulverized coal is improved, and the benefits brought by the quality improvement are higher than the increase in cost, resulting in an increase in the cost-effectiveness of blended pulverized coal quality. Therefore, the optimization effect of the pulverized coal blending structure is good.

[0114] Step 9. Conduct an economic benefit analysis. Using a cost-effectiveness analysis model, under the condition that other factors remain unchanged, by adjusting the cost of mixed pulverized coal M2, the corrected cost M2′ of mixed pulverized coal is obtained as 921.45 yuan / ton, and the cost-effectiveness correction value η2′ satisfies the following relationship:

[0115] η2′=η1=10.9317

[0116] The cost increase δ′ required to compensate for the change in the quality of the mixed pulverized coal after optimizing the coal blending structure satisfies the formula:

[0117] δ′=M2′-M1=921.45-904=17.45 yuan / ton.

[0118] Step 10. Based on the calculations and analysis, the difference Φ between the actual cost increase δ and the required cost increase δ′ of the blended pulverized coal after optimizing the coal blending structure is the true increase in coal blending cost after optimizing the pulverized coal blending structure, satisfying the formula:

[0119] Φ=δ-δ′=16-17.45=-1.45 yuan / ton

[0120] Since Φ < 0, meaning that after optimizing the pulverized coal blending structure, the actual cost of the mixed pulverized coal is reduced by 1.45 yuan / ton compared to the required cost, thus achieving positive economic benefits, the analysis shows that the pulverized coal blending scheme is an feasible scheme.

[0121] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for analyzing the coal blending structure of blast furnace pulverized coal injection, characterized in that: Includes the following steps: S1: Obtain the type of coal used for pulverized coal injection, as well as its corresponding unit price and quality composition; S2: Obtain the benchmark coal blending structure and the optimized coal blending structure, and obtain the mixed coal powder cost, various quality analysis indicators and the actual cost increase before and after the coal blending structure optimization; S3: Analyze the cost-effectiveness of mixed pulverized coal before and after coal blending structure optimization; S4: Obtain the cost correction value after coal blending structure optimization to ensure that the cost-effectiveness value of mixed coal powder is consistent before and after coal blending structure optimization, and obtain the cost increase value that needs to be paid accordingly. S5: Obtain the difference between the actual cost increase and the required cost increase, and analyze the advantages and disadvantages of the optimized pulverized coal blending structure; The mass composition mentioned in step S1 includes ash content Ad, sulfur content Std, volatile matter Vdaf, moisture Mad, fixed carbon FCd, calorific value Q, and grindability index H; For each type of pulverized coal A, B, C, D…, their baseline proportions are R… A R B R C R D …, the optimized proportions are R A ′、R B ′、R C ′、R D …, the unit price of each type of coal is M respectively A M B M C M D …Then the quality analysis indicators Ad1, Vdaf1, Std1, Q1, Mad1, H1, FCd1 and cost M1 before coal blending structure optimization are calculated as follows: Ad1= Ad A *R A + Ad B *R B + Ad C *R C + Ad D *R D +… Vdaf1= Vdaf A *R A + Vdaf B *R B + Vdaf C *R C + Vdaf D *R D +… Std1= Std A *R A + Std B *R B + Std C *R C + Std D *R D +… Q1= Q A *R A + Q B *R B + Q C *R C + Q D *R D +… Food1= Food A *R A + Food B *R B + Food C *R C + Food D *R D +… H1= H A *R A + H B *R B + H C *R C + H D *R D +… FCd1= FCd A *R A + FCd B *R B + FCd C *R C + FCd D *R D +… M1= M A *R A + M B *R B + M C *R C + M D *R D +… The following calculations were performed on the various quality analysis indicators Ad2, Vdaf2, Std2, Q2, Mad2, H2, FCd2, and cost M2 after the coal blending structure optimization: Ad2= Ad A *R A ′+ Ad B *R B ′+ Ad C *R C ′+ Ad D *R D ′+… Vdaf2= Vdaf A *R A ′+ Vdaf B *R B ′+ Vdaf C *R C ′+ Vdaf D *R D ′+… Std2= Std A *R A ′+ Std B *R B ′+ Std C *R C ′+ Std D *R D ′+… Q2= Q A *R A ′+ Q B *R B ′+ Q C *R C ′+ Q D *R D ′+… Mad2= Mad A *R A ′+ Mad B *R B ′+ Mad C *R C ′+ Mad D *R D ′+… H2= H A *R A ′+ H B *R B ′+ H C *R C ′+ H D *R D ′+… FCd2= FCd A *R A ′+ FCd B *R B ′+ FCd C *R C ′+ FCd D *R D ′+… M2= M A *R A ′+ M B *R B ′+ M C *R C ′+ M D *R D ′+… In step S3, a cost-effectiveness model is used to calculate the cost-effectiveness of the mixed pulverized coal quality indicators. The quality scores g1, g2, g3, g4, g5, g6, and g7 of various quality indicators of the mixed pulverized coal (Ad1, Vdaf1, Std1, Q1, Mad1, H1, FCd1, and Ad2, Vdaf2, Std2, Q2, Mad2, H2, FCd2, and FCd2, respectively, and the quality scores g1′, g2′, g3′, g4′, g5′, g6′, and g7′ of Ad2, Vdaf2, Std2, Q2, Mad2, H2, and FCd2, respectively, were obtained. The comprehensive quality scores of the mixed pulverized coal (G1 and G2) were then calculated, satisfying the formula: G1 = g1 + g2 + g3 + g4 + g5 + g6 + g7 G2= g1′+ g2′+ g3′+ g4′+ g5′+ g6′+ g7′ Then calculate the change in the total mass score of the mixed pulverized coal. Δ G = G2 - G1; like Δ G=0 indicates that the quality of the mixed coal powder remains unchanged after structural optimization; like Δ G > 0 indicates that the quality of the mixed pulverized coal has improved after structural optimization; like Δ G < 0 indicates that the quality of the mixed pulverized coal deteriorates after structural optimization; The cost-effectiveness values ​​η1 and η2 of the mixed pulverized coal before and after the optimization of the pulverized coal blending structure were calculated using a cost-effectiveness model, satisfying the formula: η1 = G1 / M1, η2 = G2 / M2 Changes in the cost-effectiveness of mixed pulverized coal Δ η = η2 - η1, if Δ η=0 indicates that after the optimization of the pulverized coal blending structure, the quality of the mixed pulverized coal and the cost increase or decrease are synchronized, and the cost-effectiveness of the mixed pulverized coal remains unchanged in the end. like Δ η > 0 indicates that the cost-effectiveness of the mixed pulverized coal is improved after the optimization of the pulverized coal blending structure, and the optimization effect of the pulverized coal blending structure is good. like Δ η < 0 indicates that the cost-effectiveness of the mixed pulverized coal decreased after the optimization of the pulverized coal blending structure, and the optimization effect of the pulverized coal blending structure was not good.

2. The method for analyzing the coal blending structure of blast furnace pulverized coal injection according to claim 1, characterized in that: In step S2, the actual cost increase δ incurred in coal blending satisfies the formula: δ=M2-M1 If δ=0, that is, after the optimization of the pulverized coal injection and blending structure, the actual cost of mixed pulverized coal remains unchanged; If δ>0, it means that the actual cost of mixed pulverized coal increases after the optimization of the pulverized coal blending structure. If δ < 0, it means that the actual cost of mixed pulverized coal is reduced after the optimization of the pulverized coal blending structure.

3. The method for analyzing the coal blending structure of blast furnace pulverized coal injection according to claim 1, characterized in that: In step S4, using the cost-effectiveness analysis model, under the condition that other factors remain unchanged, the corrected cost M2′ of the mixed pulverized coal and the cost-effectiveness correction value η2′ are obtained by adjusting the cost M2 of the mixed pulverized coal, satisfying the following relationship: η2′=η1 Therefore, it can be concluded that the cost increase required to compensate for the change in the quality of the mixed pulverized coal after optimizing the pulverized coal blending structure is δ′, which satisfies the formula: δ′=M2′- M1.

4. The method for analyzing the coal blending structure of blast furnace pulverized coal injection according to claim 3, characterized in that: In step S5, after optimizing the coal blending structure, the difference Φ between the actual cost increase δ of the mixed pulverized coal and the required cost increase δ′ is the true increase in coal blending cost after optimizing the coal blending structure, satisfying the formula: Φ=δ-δ′ If Φ=0, it means that after the coal injection and blending structure is adjusted, the actual cost of the mixed coal powder is equal to the cost that needs to be paid, and the economic benefit is 0. The purpose of adjusting the coal blending scheme is to implement it according to production needs. If Φ < 0, it indicates that after the adjustment of the pulverized coal blending structure, the actual cost of the mixed pulverized coal is lower than the required cost, the cost is reduced by -Φ yuan / ton, and the coal blending scheme has implementation value; If Φ > 0, it indicates that after adjusting the pulverized coal blending structure, the actual cost of the mixed pulverized coal is higher than the required cost, with a cost increase of Φ yuan / ton. Therefore, it is not recommended to adopt this approach or further optimization is needed.

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