Evaluation Method for Promoting Combustion Effect of Bituminous Coal on Mixed Coal in Blast Furnace

Abstract

The present invention provides a method for evaluating the combustion promotion effect of bituminous coal on blended coal for blast furnaces. First, the corresponding single materials and mixed materials of the bituminous coal to be evaluated and the control bituminous coal are obtained, and then pulverized coal combustion tests, gas phase component analysis, and residual carbon analysis are carried out respectively. According to the analysis results, the gas phase combustion rate R g and the residual carbon combustion rate R c of each material, and the pulverized coal combustion rate η are calculated. Finally, according to the pulverized coal combustion rate η of each material, the combustion promotion coefficient P of the bituminous coal to be evaluated for the blended coal in the blast furnace is calculated to evaluate the combustion promotion effect of the bituminous coal to be evaluated on the blended coal in the blast furnace. In view of the resource characteristics of bituminous coal and the process advantages of blast furnace injection, the present invention proposes an evaluation index for the combustion promotion effect of blended coal based on the combination of gas phase component and residual carbon analysis by testing the gas composition and unburned carbon obtained after the combustion of single materials and mixed materials. It comprehensively considers the analysis of the gas and solid content after the combustion of pulverized coal, and sets a reasonable control, and can accurately evaluate the combustion promotion effect of bituminous coal on blended coal in the blast furnace.

Description

Technical Field

[0001] The present invention relates to the technical field of pulverized coal injection in blast furnaces, and in particular, to a method for evaluating the combustion promotion effect of bituminous coal on blended coal in blast furnaces. Background Technique

[0002] Pulverized coal injection in blast furnaces is an important technology that has developed rapidly and become increasingly mature in the ironmaking process. Its main purpose is to use the abundant pulverized coal for injection to replace the increasingly scarce and expensive metallurgical coke, so as to reduce the environmental impact of the coking process, optimize the energy consumption structure of the pre-ironmaking system, and at the same time create conditions for improving the operation of the blast furnace and strengthening smelting. In the prior art, a thermogravimetric analyzer is mainly used to study the combustion characteristics of blended coal. The research dimension is relatively single, not detailed and scientific enough, and it cannot provide an enterprise with a scientific evaluation index for the combustion promotion effect of blended coal to guide production. Therefore, it is very necessary to propose a method for evaluating the combustion promotion effect of bituminous coal on blended coal in blast furnaces. Summary of the Invention

[0003] The main purpose of the present invention is to provide a method for evaluating the combustion promotion effect of bituminous coal on blended coal in blast furnaces, so as to solve the problems of single calculation dimension and incomplete results of the combustion promotion effect of blended coal in blast furnaces in the prior art.

[0004] To achieve the above object, according to one aspect of the present invention, a method for evaluating the combustion promotion effect of bituminous coal on blended coal in blast furnaces is provided, including the following steps: Step S1, material preparation, obtaining the bituminous coal to be evaluated, the control bituminous coal and anthracite; dividing the bituminous coal to be evaluated into two parts, the first part of the bituminous coal to be evaluated is used as the first single material, and the second part of the bituminous coal to be evaluated is mixed with anthracite to form the first mixed material; dividing the control bituminous coal into two parts, the first part of the control bituminous coal is used as the second single material, and the second part of the control bituminous coal is mixed with anthracite to form the second mixed material; the mixing mass ratio of the second part of the bituminous coal to be evaluated and anthracite is the same as the mixing mass ratio of the second part of the control bituminous coal and anthracite; Step S2, combustion test, respectively performing pulverized coal combustion tests on the first single material, the second single material, the first mixed material, the second mixed material and anthracite, obtaining the gas and unburned carbon after combustion of each material respectively, and performing gas phase component analysis on the gas and residual carbon analysis on the unburned carbon; Step S3, result calculation, calculating the gas phase combustion rate R g of each material according to the results of the gas phase component analysis of each material; calculating the residual carbon combustion rate R c of each material according to the results of the residual carbon analysis of each material; calculating the pulverized coal combustion rate η of each material according to the gas phase combustion rate R g of each material and the residual carbon combustion rate R c of each material; calculating the combustion promotion coefficient P of the bituminous coal to be evaluated on the blended coal in the blast furnace according to the pulverized coal combustion rate η of each material, and obtaining the combustion promotion effect of the bituminous coal to be evaluated on the blended coal in the blast furnace; wherein, the bituminous coal to be evaluated is different from the control bituminous coal.

[0005] Further, in step S3, the gas-phase combustion rate R of each material is calculated by formula (1-1) g :

[0006]

[0007] In formula (1-1), X CO2 and X CO are respectively the mole fractions of CO2 and CO generated by burning 1 g of pulverized coal material; X CO2理论 is the mole fraction of CO2 theoretically generated by complete combustion of carbon in the pulverized coal material.

[0008] Further, in step S3, the residual carbon combustion rate R of each material is calculated by formula (1-2) c :

[0009]

[0010] In formula (1-2), m c is the mass of the residual combustibles in the pulverized coal material under the conditions of 1100 - 1500 °C; m0 is the mass of the combustibles in the pulverized coal material under the conditions of 1100 - 1500 °C.

[0011] Further, in step S3, the pulverized coal combustion rate η of each material is calculated by formula (1-3):

[0012]

[0013] Further, in step S3, the promoting combustion coefficient P of the bituminous coal to be evaluated for the blast furnace blended coal is calculated by formula (1-4):

[0014]

[0015] In formula (1-4), η1 is the pulverized coal combustion rate of the first single material, η2 is the pulverized coal combustion rate of the second single material, η3 is the pulverized coal combustion rate of the first mixed material, η4 is the pulverized coal combustion rate of the second mixed material, η5 is the combustion rate of anthracite, x1 is the difference between the pulverized coal combustion rate of the first mixed material and its theoretical combustion rate, x2 is the difference between the pulverized coal combustion rate of the second mixed material and its theoretical combustion rate, and x is the mixing mass ratio of the second part of the bituminous coal to be evaluated and the second part of the control bituminous coal to anthracite when the mass of anthracite is 1.

[0016] Further, when P > 0, there are the following three cases: First, x1 > 0, x2 > 0; second, x1 > 0, x2 < 0; third, x1 < 0, x2 < 0. And only when P > 0 and x1 > 0, the bituminous coal has a promoting combustion effect on the blast furnace blended coal.

[0017] Further, in step S1, the bituminous coal for comparison is Shaogang bituminous coal, and the anthracite is Russian anthracite.

[0018] Further, x is 1-3; preferably, when the types of bituminous coal to be evaluated are different, the mixing mass ratios of the second part of the bituminous coal to be evaluated and anthracite for each bituminous coal to be evaluated are the same.

[0019] Further, in step S2, the pulverized coal combustion test is carried out in a blast furnace coal injection combustion simulation experimental device.

[0020] Further, in step S3, the residual carbon analysis is the carbon element content analysis.

[0021] The present invention provides a method for evaluating the combustion promotion effect of bituminous coal on blast furnace blended coal in view of the resource characteristics of bituminous coal and the process advantages of blast furnace injection. By testing the gas components and unburned carbon obtained after the combustion of single materials and mixed materials, an evaluation index for the combustion promotion effect of blended coal based on the combination of gas phase components and residual carbon analysis is proposed. The evaluation method of the present invention comprehensively considers the analysis of the gas and solid content after the combustion of pulverized coal, and sets reasonable controls, and can accurately evaluate the combustion promotion effect of bituminous coal on blast furnace blended coal, which will be of great significance for balancing the blast furnace injection coal market, stabilizing the preferred coal types purchased by steel enterprises, and improving the economic benefits of blast furnaces. Specific Embodiments

[0022] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the embodiments.

[0023] As described in the background art of the present invention, there are problems in the prior art such as a single calculation dimension and incomplete results for the combustion promotion effect of blast furnace blended coal. To solve the above problems, in a typical embodiment of the present invention, a method for evaluating the combustion promotion effect of bituminous coal on blast furnace blended coal is provided, including the following steps: Step S1, material preparation, obtaining the bituminous coal to be evaluated, the reference bituminous coal, and anthracite; dividing the bituminous coal to be evaluated into two parts, the first part of the bituminous coal to be evaluated is used as the first single material, and the second part of the bituminous coal to be evaluated is mixed with anthracite to form the first mixed material; dividing the reference bituminous coal into two parts, the first part of the reference bituminous coal is used as the second single material, and the second part of the reference bituminous coal is mixed with anthracite to form the second mixed material; Step S2, combustion test, performing pulverized coal combustion tests on the first single material, the second single material, the first mixed material, the second mixed material, and anthracite respectively, obtaining the gas and unburned carbon after the combustion of each material respectively, and performing gas phase component analysis on the gas and residual carbon analysis on the unburned carbon; Step S3, result calculation, calculating the gas phase combustion rate R of each material according to the results of each gas phase component analysis g ; calculating the residual carbon combustion rate R of each material according to the results of the residual carbon analysis of each material c; according to the gas-phase combustion rate R of each material g and the residual carbon combustion rate R of each material c , calculate the pulverized coal combustion rate η of each material; according to the pulverized coal combustion rate η of each material, calculate the combustion promotion coefficient P of the bituminous coal to be evaluated for the blended coal in the blast furnace, and obtain the combustion promotion effect of the bituminous coal to be evaluated for the blended coal in the blast furnace; among them, the bituminous coal to be evaluated is different from the control bituminous coal.

[0024] In the present invention, the corresponding single materials and mixed materials of the bituminous coal to be evaluated and the control bituminous coal are first obtained, and then the pulverized coal combustion property test, gas-phase component analysis and residual carbon analysis are carried out respectively. According to the analysis results, calculate the gas-phase combustion rate R of each material g , the residual carbon combustion rate R c , and the pulverized coal combustion rate η; finally, according to the pulverized coal combustion rate η of each material, calculate the combustion promotion coefficient P of the bituminous coal to be evaluated for the blended coal in the blast furnace, and evaluate the combustion promotion effect of the bituminous coal to be evaluated for the blended coal in the blast furnace. The present invention provides a method for evaluating the combustion promotion effect of bituminous coal on the blended coal in the blast furnace in view of the resource characteristics of bituminous coal and the process advantages of blast furnace injection. By testing the gas composition and unburned carbon obtained after the combustion of single materials and mixed materials, an evaluation index for the combustion promotion effect of blended coal based on the combination of gas-phase components and residual carbon analysis is proposed. The evaluation method of the present invention comprehensively considers the analysis of the gas and solid content after the combustion of pulverized coal, and sets a reasonable control, and can accurately evaluate the combustion promotion effect of bituminous coal on the blended coal in the blast furnace, which will be of great significance for balancing the blast furnace injection coal market, stabilizing the preferred coal types purchased by steel enterprises, and improving the economic benefits of blast furnaces.

[0025] Gas-phase component analysis is to calculate the combustion rate of carbon element by using the content of CO and CO2 in the gas, that is, to calculate the proportion of carbon element in coal burned into CO and CO2. In a preferred embodiment, in step S3, the gas-phase combustion rate R of each material is calculated by formula (1-1) g :

[0026]

[0027] In formula (1-1), X CO2 , X CO are respectively the mole fractions of CO2 and CO generated by burning 1 g of pulverized coal material; X CO2理论 is the mole fraction of CO2 generated by the complete combustion of carbon in the pulverized coal material theoretically, and all these data can be obtained by the gas analysis system. When R g is larger, it indicates that the combustion performance of this material is better. Among them, R g can include the following: the gas-phase combustion rate R of the pulverized coal of the first single material g 1, the gas-phase combustion rate R of the pulverized coal of the second single material g 2, the gas-phase combustion rate R of the pulverized coal of the first mixed material g 3 and the gas-phase combustion rate R of the pulverized coal of the second mixed material g4. The gas-phase combustion rate of anthracite is R g 5.

[0028] In a preferred embodiment, in step S3, the residual carbon analysis is the analysis of the carbon element content, which is to measure the mass of the residual combustibles after the pulverized coal combustion.

[0029] Specifically, in a preferred embodiment, in step S3, the residual carbon combustion rate R of each material is calculated by formula (1-2) c :

[0030]

[0031] In formula (1-2), m c is the mass of the residual combustibles in the pulverized coal material under the condition of 1100°C to 1500°C; m0 is the mass of the combustibles in the pulverized coal material under the condition of 1100°C to 1500°C. When R c is relatively large, it indicates that the combustion performance of this material is better. Among them, R c can include the following: the residual carbon combustion rate R c 1 of the first single material, the residual carbon combustion rate R c 2 of the second single material, the residual carbon combustion rate R c 3 of the first mixed material and the residual carbon combustion rate R c 4 of the second mixed material, and the residual carbon combustion rate of anthracite is R c 5.

[0032] After obtaining the gas-phase combustion rate R g of each of the foregoing materials and the residual carbon combustion rate R c of each material, in a preferred embodiment, in step S3, the pulverized coal combustion rate η of each material is calculated by formula (1-3), so as to eliminate the errors of the gas-phase combustion rate R g and the residual carbon combustion rate R c of each material:

[0033]

[0034] When η is relatively large, it indicates that the combustion performance of this material is better.

[0035] Finally, the combustion promotion coefficient P of the bituminous coal to be evaluated for the blast furnace blended coal is calculated by formula (1-4):

[0036]

[0037] In formula (1-4), η1 is the pulverized coal combustion rate of the first single material, η2 is the pulverized coal combustion rate of the second single material, η3 is the pulverized coal combustion rate of the first mixed material, η4 is the pulverized coal combustion rate of the second mixed material, η5 is the combustion rate of anthracite, x1 is the difference between the pulverized coal combustion rate of the first mixed material and its theoretical combustion rate, x2 is the difference between the pulverized coal combustion rate of the second mixed material and its theoretical combustion rate, and x is the mixing mass ratio of the second part of the bituminous coal to be evaluated and the second part of the control bituminous coal to anthracite when the mass of anthracite is 1.

[0038] As described above, the evaluation method of the present invention comprehensively considers the analysis of the gas and solid content after pulverized coal combustion, and sets a reasonable control, which can accurately evaluate the combustion promotion effect of bituminous coal on the blended coal in the blast furnace. In a preferred embodiment, when P>0, there are the following three cases: First, x1>0, x2>0; second, x1>0, x2<0; third, x1<0, x2<0. When and only when P>0 and x1>0, the bituminous coal has a combustion promotion effect on the blended coal in the blast furnace; conversely, in other cases, the bituminous coal has no combustion promotion effect on the blended coal in the blast furnace.

[0039] In order to make the evaluation method of the present invention more reference-worthy and universal, in a preferred embodiment, in step S1, the control bituminous coal is Shaogang bituminous coal and the anthracite is Russian anthracite. Shendong bituminous coal is a high-quality steam coal in China, with the characteristics of "three highs and one low", that is, high calorific value, high volatile matter, high reactivity, and low sulfur content. In addition to the above characteristics, Shendong bituminous coal also has a significant characteristic, that is, low ash melting point and high calcium oxide content. The calcium oxide content in the ash of some Shendong bituminous coal exceeds 30%, also known as Shendong high-calcium bituminous coal. Due to the relatively high calcium oxide content, it has a relatively low ash melting point. If it is directly used for power plant combustion, it will cause problems such as slagging, affecting the stable operation of the boiler. Therefore, in order to expand the range of bituminous coal injected into the blast furnace and stabilize the operation indexes of the blast furnace, it is preferred that the bituminous coal to be evaluated is Shendong high-calcium coal, which is more suitable for the evaluation method of the present invention, can accurately evaluate its combustion promotion effect on the blended coal in the blast furnace, and is convenient for production.

[0040] The blending process only needs to make the bituminous coal and anthracite evenly mixed. In a preferred embodiment, x is 1 to 3; preferably, when the types of the bituminous coal to be evaluated are different, the mixing mass ratio of the second part of the bituminous coal to be evaluated and anthracite for each bituminous coal to be evaluated is the same, so that the evaluation results of different bituminous coals are more accurate and can be compared more conveniently.

[0041] In a preferred embodiment, in step S2, the pulverized coal combustion property test is carried out in a blast furnace coal injection combustion simulation experimental device. The details of this device can be found in Patent CN200720190577.9. It can simulate the blast furnace tuyere environment to carry out the pulverized coal combustion property test, and the measurement results are more accurate and have more practical significance.

[0042] The present application will be further described in detail below in conjunction with specific embodiments, which should not be construed as limiting the scope claimed in the present application.

[0043] Analysis method:

[0044] Analysis of gas-phase components: QGS-08C infrared gas analyzer.

[0045] Analysis of residual carbon: FlashSmart CHNS / O elemental analyzer.

[0046] Example 1

[0047] Step S1: The bituminous coal to be evaluated is Shendong high-calcium coal, the reference bituminous coal is Shaogang bituminous coal, and the anthracite is Russian anthracite; the Shendong high-calcium coal is evenly divided into two parts. The first part of the Shendong high-calcium coal is used as the first single material, and the second part of the Shendong high-calcium coal is mixed with Russian anthracite in a mass ratio of 2:1 (x is 2) and used as the first mixed material; the Shaogang bituminous coal is evenly divided into two parts. The first part of the Shaogang bituminous coal is used as the second single material, and the second part of the Shaogang bituminous coal is mixed with Russian anthracite in a mass ratio of 2:1 and used as the second mixed material;

[0048] Step S2: Perform pulverized coal combustion tests on the first single material, the second single material, the first mixed material, the second mixed material, and the anthracite respectively, and obtain the gas and unburned carbon after the combustion of each material respectively. Then conduct gas-phase component analysis on the gas and residual carbon analysis on the unburned carbon;

[0049] Step S3: First, according to the gas-phase component analysis, calculate the gas-phase combustion rate R using formula (1-1) g , and obtain the gas-phase combustion rate R g 1 of the pulverized coal of the first single material, the gas-phase combustion rate R g 2 of the pulverized coal of the second single material, the gas-phase combustion rate R g 3 of the pulverized coal of the first mixed material, and the gas-phase combustion rate R g 4 of the pulverized coal of the second mixed material, and the gas-phase combustion rate of the anthracite is R g 5; Second, according to the residual carbon analysis, calculate the residual carbon combustion rate R using formula (1-2) c , and obtain the residual carbon combustion rate R c 1 of the first single material, the residual carbon combustion rate R c 2 of the second single material, the residual carbon combustion rate R c 3 of the first mixed material, and the residual carbon combustion rate R c 4 of the second mixed material, and the residual carbon combustion rate of the anthracite is R c 5; Third, according to the gas-phase combustion rate R g and the residual carbon combustion rate R c, the pulverized coal combustion rate η is calculated by formula (1-3) to obtain the combustion rate η1 of the first single material, the combustion rate η2 of the second single material, the combustion rate η3 of the first mixed material, the combustion rate η4 of the second mixed material, and the anthracite combustion rate is η5; fourthly, the promoting combustion coefficient P of Shendong high-calcium coal on the blended coal in the blast furnace is calculated by formula (1-4).

[0050] Example 2

[0051] The difference between Example 2 and Example 1 is only that in step S1, the second part of Shendong high-calcium coal and Russian anthracite are mixed at a mass ratio of 1:1 (x is 1) and used as the first mixed material; the second part of Shaogang bituminous coal and Russian anthracite are mixed at a mass ratio of 1:1 and used as the second mixed material.

[0052] Example 3

[0053] The difference between Example 3 and Example 1 is only that in step S1, the second part of Shendong high-calcium coal and Russian anthracite are mixed at a mass ratio of 3:1 (x is 3) and used as the first mixed material; the second part of Shaogang bituminous coal and Russian anthracite are mixed at a mass ratio of 3:1 and used as the second mixed material.

[0054] Example 4

[0055] The difference between Example 4 and Example 1 is only that in step S1, the second part of Shendong high-calcium coal and Russian anthracite are mixed at a mass ratio of 0.8:1 (x is 0.8) and used as the first mixed material; the second part of Shaogang bituminous coal and Russian anthracite are mixed at a mass ratio of 0.8:1 and used as the second mixed material.

[0056] Example 5

[0057] The difference between Example 5 and Example 1 is only that in step S1, the second part of Shendong high-calcium coal and Russian anthracite are mixed at a mass ratio of 0.6:1 (x is 0.6) and used as the first mixed material; the second part of Shaogang bituminous coal and Russian anthracite are mixed at a mass ratio of 0.6:1 and used as the second mixed material.

[0058] Example 6

[0059] The difference between Example 6 and Example 1 is only that in step S1, the second part of Shendong high-calcium coal and Russian anthracite are mixed at a mass ratio of 0.4:1 (x is 0.4) and used as the first mixed material; the second part of Shaogang bituminous coal and Russian anthracite are mixed at a mass ratio of 0.4:1 and used as the second mixed material.

[0060] The calculation results of Examples 1 to 6 are shown in Table 1.

[0061] Table 1

[0062]

[0063]

[0064] As can be seen from the above, in Examples 1 to 4, P>0 and x1>0, and the bituminous coal in the corresponding proportion has a combustion-promoting effect on the blended coal for blast furnaces; in Example 5, P>0 but x1<0, and in Example 6, P<0 and x1<0, and the bituminous coal in the corresponding proportion has no combustion-promoting effect on the blended coal for blast furnaces. In summary, the method for evaluating the combustion-promoting effect of bituminous coal on the blended coal for blast furnaces according to the present invention, aiming at the resource characteristics of bituminous coal and the process advantages of blast furnace injection, by testing the gas components and unburned carbon obtained after the combustion of single materials and mixed materials, and based on this, a combustion-promoting effect evaluation index for blended coal combining gas-phase component and residual carbon analysis is proposed, comprehensively considering the analysis of the gas and solid content after coal powder combustion, and setting reasonable controls, can accurately evaluate the combustion-promoting effect of bituminous coal on the blended coal for blast furnaces.

[0065] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for evaluating the combustion promotion effect of bituminous coal on blended coal in blast furnaces, characterized in that, Including the following steps: Step S1, material preparation: obtain the bituminous coal to be evaluated, the reference bituminous coal, and the anthracite; Divide the bituminous coal to be evaluated into two parts. The first part of the bituminous coal to be evaluated is used as the first single material, and the second part of the bituminous coal to be evaluated is mixed with the anthracite to form the first mixed material; divide the reference bituminous coal into two parts. The first part of the reference bituminous coal is used as the second single material, and the second part of the reference bituminous coal is mixed with the anthracite to form the second mixed material; the mixing mass ratio of the second part of the bituminous coal to be evaluated and the anthracite is the same as the mixing mass ratio of the second part of the reference bituminous coal and the anthracite; Step S2, combustion test: conduct pulverized coal combustion tests on the first single material, the second single material, the first mixed material, the second mixed material, and the anthracite respectively, obtain the gas and unburned carbon after the combustion of each material respectively, and conduct gas phase component analysis of the gas and residual carbon analysis of the unburned carbon; Step S3, result calculation: Based on the results of the analysis of each gas-phase component, calculate the gas-phase combustion rate R of each material g ; Based on the results of the analysis of the residual carbon of each material, calculate the residual-carbon combustion rate R of each material c ; Based on the gas-phase combustion rate R of each material g and the residual-carbon combustion rate R of each material c , calculate the pulverized coal combustion rate η of each material; Based on the pulverized coal combustion rate η of each material, calculate the combustion-promoting coefficient P of the bituminous coal to be evaluated for the blended coal in the blast furnace, and obtain the combustion-promoting effect of the bituminous coal to be evaluated on the blended coal in the blast furnace Calculate the pulverized coal combustion rate η of each material according to formula (1-3): （1-3）； Calculate the combustion promotion coefficient P of the bituminous coal to be evaluated for the blast furnace blended coal according to formula (1-4): （1-4）； In formula (1-4), η1 is the pulverized coal combustion rate of the first single material, η2 is the pulverized coal combustion rate of the second single material, η3 is the pulverized coal combustion rate of the first mixed material, η4 is the pulverized coal combustion rate of the second mixed material, η5 is the combustion rate of the anthracite, x1 is the difference between the pulverized coal combustion rate of the first mixed material and its theoretical combustion rate, x2 is the difference between the pulverized coal combustion rate of the second mixed material and its theoretical combustion rate, and x is the mixing mass ratio of the second part of the bituminous coal to be evaluated and the second part of the reference bituminous coal to the anthracite when the mass of the anthracite is 1; When P>0, there are the following three situations: First, x1>0, x2>0, Second, x1>0, x2<0, Third, x1<0, x2<0, When and only when P>0 and x1>0, the bituminous coal has a combustion promotion effect on the blast furnace blended coal; Among them, the bituminous coal to be evaluated is different from the reference bituminous coal.

2. The evaluation method according to claim 1, wherein In the step S3, the gas-phase combustion rate R of each material is calculated by the formula (1-1). g : （1-1）； In formula (1-1), X CO2 , X CO are respectively the mole fractions of CO2 and CO generated by burning 1 g of pulverized coal material; X CO2理论 is the mole fraction of CO2 theoretically generated by complete combustion of carbon in the pulverized coal material.

3. The evaluation method according to claim 1 or 2, characterized in that In the step S3, the combustion rate R of the residual carbon of each material is calculated by the formula (1-2). c : （1-2）； In formula (1-2), m c is the mass of the residual combustible in the pulverized coal material under the condition of 1100~1500°C; m0 is the mass of the combustible in the pulverized coal material under the condition of 1100~1500°C.

4. The evaluation method according to claim 1 or 2, characterized in that In step S1, the reference bituminous coal is Shaogang bituminous coal, and the anthracite is Russian anthracite.

5. The evaluation method according to claim 1 or 2, characterized in that x is 1 to 3.

6. The evaluation method according to claim 5, wherein When the types of the bituminous coal to be evaluated are different, the mixing mass ratio of the second part of the bituminous coal to be evaluated and the anthracite is the same for each bituminous coal to be evaluated.

7. The evaluation method according to claim 1 or 2, characterized in that, In step S2, the pulverized coal combustion test is carried out in a blast furnace pulverized coal combustion simulation experimental device.

8. The evaluation method according to claim 1 or 2, characterized in that, In step S3, the residual carbon analysis is carbon element content analysis.

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